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Sample records for ptf collaboration based

  1. Program Specificity for Ptf1a in Pancreas versus Neural Tube Development Correlates with Distinct Collaborating Cofactors and Chromatin Accessibility

    Science.gov (United States)

    Meredith, David M.; Borromeo, Mark D.; Deering, Tye G.; Casey, Bradford H.; Savage, Trisha K.; Mayer, Paul R.; Hoang, Chinh; Tung, Kuang-Chi; Kumar, Manonmani; Shen, Chengcheng; Swift, Galvin H.

    2013-01-01

    The lineage-specific basic helix-loop-helix transcription factor Ptf1a is a critical driver for development of both the pancreas and nervous system. How one transcription factor controls diverse programs of gene expression is a fundamental question in developmental biology. To uncover molecular strategies for the program-specific functions of Ptf1a, we identified bound genomic regions in vivo during development of both tissues. Most regions bound by Ptf1a are specific to each tissue, lie near genes needed for proper formation of each tissue, and coincide with regions of open chromatin. The specificity of Ptf1a binding is encoded in the DNA surrounding the Ptf1a-bound sites, because these regions are sufficient to direct tissue-restricted reporter expression in transgenic mice. Fox and Sox factors were identified as potential lineage-specific modifiers of Ptf1a binding, since binding motifs for these factors are enriched in Ptf1a-bound regions in pancreas and neural tube, respectively. Of the Fox factors expressed during pancreatic development, Foxa2 plays a major role. Indeed, Ptf1a and Foxa2 colocalize in embryonic pancreatic chromatin and can act synergistically in cell transfection assays. Together, these findings indicate that lineage-specific chromatin landscapes likely constrain the DNA binding of Ptf1a, and they identify Fox and Sox gene families as part of this process. PMID:23754747

  2. PTF discovery of PTF10abyy, a young Type II Supernova

    Science.gov (United States)

    Gal-Yam, A.; Yaron, O.; Ben-Ami, S.; Sternberg, A.; Green, Y.; Xu, D.; Arcavi, I.; Kasliwal, M. M.; Quimby, R. M.; Ofek, E. O.; Kulkarni, S. R.; Nugent, H. Ebeling P.; Howell, D. A.; Sullivan, M.; Bloom, J. S.; Law, N. M.

    2010-12-01

    The PTF (ATEL #1964; http://www.astro.caltech.edu/ptf/) reports the discovery of a new supernova, PTF10abyy. The supernova was discovered by Oarical, an autonomous software framework of the PTF collaboration, on December 8 UT at RA(J2000) = 05:16:40.52 and DEC(J2000) = +06:47:53.8 at a magnitude of 18.7 in R-band (calibrated with respect to the USNOB1 catalog). The supernova was not detected down to mag 21 in previous PTF images taken during Dec.

  3. Physiochemical characterization and antimicrobial evaluation of phenylthiourea-formaldehyde polymer (PTF) based polymeric ligand and its polymer metal complexes

    Science.gov (United States)

    Ahamad, Tansir; Alshehri, Saad M.

    2013-05-01

    Phenylthiourea-formaldehyde polymer (PTF) has been synthesized via polycondensation of phenylthiourea and formaldehyde in basic medium and its corresponding metal complexes [PTF-M(II)] were prepared with Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) ions. The synthesized polymers have been characterized by elemental analysis, magnetic susceptibility, UV-visible, FT-IR, 1H NMR, 13C NMR, ESR spectroscopy and thermogravimetric analysis (TGA). Elemental analysis, electronic spectra and magnetic moment measurement indicate that PTF-Mn(II), PTF-Co(II) and PTF-Ni(II) show octahedral geometry, while PTF-Cu(II) and PTF-Zn(II) show square planar and tetrahedral geometry, respectively. The results of TGA ascribed that all the PTF-M(II) showed better heat-resistance properties than PTF resin. In vitro antimicrobial activities were performed against several bacteria and fungi using agar well diffusion method. The results of microbial activity were compared with Kanamycin and Miconazole as standard antibiotics for antibacterial and antifungal activities respectively.

  4. Patient Treatment File (PTF)

    Data.gov (United States)

    Department of Veterans Affairs — This database is part of the National Medical Information System (NMIS). The Patient Treatment File (PTF) contains a record for each inpatient care episode provided...

  5. PTF12os and iPTF13bvn. Two stripped-envelope supernovae from low-mass progenitors in NGC 5806

    CERN Document Server

    Fremling, C; Taddia, F; Ergon, M; Fraser, M; Karamehmetoglu, E; Valenti, S; Jerkstrand, A; Arcavi, I; Bufano, F; Rosa, N Elias; Filippenko, A V; Fox, D; Gal-Yam, A; Howell, D A; Kotak, R; Mazzali, P; Milisavljevic, D; Nugent, P E; Nyholm, A; Pian, E; Smartt, S

    2016-01-01

    We investigate two stripped-envelope supernovae (SNe) discovered in the nearby galaxy NGC 5806 by the (i)PTF. These SNe, designated PTF12os/SN 2012P and iPTF13bvn, exploded at a similar distance from the host-galaxy center. We classify PTF12os as a Type IIb SN based on our spectral sequence; iPTF13bvn has previously been classified as Type Ib having a likely progenitor with zero age main sequence (ZAMS) mass below ~17 solar masses. Our main objective is to constrain the explosion parameters of iPTF12os and iPTF13bvn, and to put constraints on the SN progenitors. We present comprehensive datasets on the SNe, and introduce a new reference-subtraction pipeline (FPipe) currently in use by the iPTF. We perform a detailed study of the light curves (LCs) and spectral evolution of the SNe. The bolometric LCs are modeled using the hydrodynamical code HYDE. We use nebular models and late-time spectra to constrain the ZAMS mass of the progenitors. We perform image registration of ground-based images of PTF12os to archiv...

  6. VizieR Online Data Catalog: Metallicity from Type II SN from (i)PTF (Taddia+, 2016)

    Science.gov (United States)

    Taddia, F.; Moquist, P.; Sollerman, J.; Rubin, A.; Leloudas, G.; Gal-Yam, A.; Arcavi, I.; Cao, Y.; Filippenko, A. V.; Graham, M. L.; Mazzali, P. A.; Nugent, P. E.; Pan, Y.-C.; Silverman, J. M.; Xu, D.; Yaron, O.

    2016-06-01

    We collected the optical spectra of the 57 SNe II presented by R15, as obtained by the (i)PTF collaboration. The selected spectra were obtained with many different telescopes and instruments, as summarized in Table A.1. For each spectrum where FeIIλ5018 was identified, we established the phase, based on the explosion date reported by Rubin et al. (2016ApJ...820...33R). (2 data files).

  7. PTF SN discovery report, April 2012

    Science.gov (United States)

    Gal-Yam, Avishay; Arcavi, I.; Ben-Ami, S.; Yaron, O.; Nugent, P.; Levitam, D.; Simonian, G.; Sesar, B.; Cao, Y.; Horesh, A.; Bellm, E.; Silverman, J.; Miller, A.; Cenko, S. B.; Clubb, K. I.; Filippenko, A. V.; Shivvers, I.; Kasliwal, M.; Parrent, J.; Maguire, K.; Pan, Y.-C.

    2012-05-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 19 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B ), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org ).

  8. PTF SN discovery report, August 2012

    Science.gov (United States)

    Arcavi, Iair; Gal-Yam, A.; Ben-Ami, S.; Yaron, O.; Horesh, P. Nugent A.; Cao, Y.; Bellm, E.; Fynbo, J.; Wiis, J.; Olesen, J.; Engedal, L.; Larsen, A.; Kasliwal, M.; Pan, Y.-C.; Graham, M.; Parrent, J.; Quimby, R.; PTF Team

    2012-08-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 12 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B ), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org ).

  9. PTF SN discovery report, September 8, 2012

    Science.gov (United States)

    Gal-Yam, A.; Nugent, P.; Walker, E.; Cenko, S. B.; Fox, O.

    2012-09-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf ; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 8 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B ), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org ).

  10. PTF SN discovery report, July 2012

    Science.gov (United States)

    Gal-Yam, Avishay; Ben-Ami, Sagi; Arcavi, I.; Yaron, O.; Nugent, Peter; Sesar, B.; Cao, Y.; Silverman, J.; Clubb, K.; Filippenko, A. V.; Cenko, S. B.; Parrent, J.; Maguire, K.; Sullivan, M.

    2012-08-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/ ; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 14 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B ), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org ).

  11. PTF SN discovery report, March 2012

    Science.gov (United States)

    Gal-Yam, Avishay; Arcavi, I.; Ben-Ami, S.; Yaron, O.; Nugent, P.; Levitam, D.; Simonian, G.; Sesar, B.; Cao, Y.; Horesh, A.; Bellm, E.; Silverman, J.; Miller, A.; Cenko, S. B.; Clubb, K. I.; Filippenko, A. V.; Shivvers, I.; Kasliwal, M.; Parrent, J.; Maguire, K.; Pan, Y.-C.

    2012-05-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 26 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B ), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org ).

  12. PTF SN discovery report, October 9, 2012

    Science.gov (United States)

    Gal-Yam, A.; Nugent, P.; Cao, Y.; Levitan, D.; Hallinan, G.; Kyne, G.; Silverman, J.; Clubb, K.; Miller, A.; Fox, O.; Suzuki, N.; Quimby, R.

    2012-10-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 9 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B ), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org ).

  13. PTF12os and iPTF13bvn. Two stripped-envelope supernovae from low-mass progenitors in NGC 5806

    Science.gov (United States)

    Fremling, C.; Sollerman, J.; Taddia, F.; Ergon, M.; Fraser, M.; Karamehmetoglu, E.; Valenti, S.; Jerkstrand, A.; Arcavi, I.; Bufano, F.; Elias Rosa, N.; Filippenko, A. V.; Fox, D.; Gal-Yam, A.; Howell, D. A.; Kotak, R.; Mazzali, P.; Milisavljevic, D.; Nugent, P. E.; Nyholm, A.; Pian, E.; Smartt, S.

    2016-09-01

    Context. We investigate two stripped-envelope supernovae (SNe) discovered in the nearby galaxy NGC 5806 by the (intermediate) Palomar Transient Factory [(i)PTF]. These SNe, designated PTF12os/SN 2012P and iPTF13bvn, exploded within ~520 days of one another at a similar distance from the host-galaxy center. We classify PTF12os as a Type IIb SN based on our spectral sequence; iPTF13bvn has previously been classified as Type Ib having a likely progenitor with zero age main sequence (ZAMS) mass below ~17 M⊙. Because of the shared and nearby host, we are presented with a unique opportunity to compare these two SNe. Aims: Our main objective is to constrain the explosion parameters of iPTF12os and iPTF13bvn, and to put constraints on the SN progenitors. We also aim to spatially map the metallicity in the host galaxy, and to investigate the presence of hydrogen in early-time spectra of both SNe. Methods: We present comprehensive datasets collected on PTF12os and iPTF13bvn, and introduce a new automatic reference-subtraction photometry pipeline (FPipe) currently in use by the iPTF. We perform a detailed study of the light curves (LCs) and spectral evolution of the SNe. The bolometric LCs are modeled using the hydrodynamical code hyde. We analyze early spectra of both SNe to investigate the presence of hydrogen; for iPTF13bvn we also investigate the regions of the Paschen lines in infrared spectra. We perform spectral line analysis of helium and iron lines to map the ejecta structure of both SNe. We use nebular models and late-time spectroscopy to constrain the ZAMS mass of the progenitors. We also perform image registration of ground-based images of PTF12os to archival HST images of NGC 5806 to identify a potential progenitor candidate. Results: We find that our nebular spectroscopy of iPTF13bvn remains consistent with a low-mass progenitor, likely having a ZAMS mass of ~12M⊙. Our late-time spectroscopy of PTF12os is consistent with a ZAMS mass of ~15M⊙. We

  14. Analysis list: Ptf1a [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available Ptf1a Embryo,Pancreas + mm9 http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/target/Ptf1...a.1.tsv http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/target/Ptf1a.5.tsv http://dbarchive.biosciencedbc....jp/kyushu-u/mm9/target/Ptf1a.10.tsv http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/colo/Ptf1a.Embryo.tsv,htt...p://dbarchive.biosciencedbc.jp/kyushu-u/mm9/colo/Ptf1a.Pancreas.tsv http://dbarch

  15. PTF weekly SN discovery report, July 1, 2011

    Science.gov (United States)

    Gal-Yam, A.; Ben-Ami, S.; Sternberg, A.; Polishuk, D.; Arcavi, I.; Nugent, P.; Silverman, J.; Cenk, S. B.

    2011-06-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 17 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B ), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org ).

  16. PTF weekly SN discovery report, January 21, 2012

    Science.gov (United States)

    Gal-Yam, Avishay; Arcavi, I.; Nugent, Peter; Kasliwal, M.; Walker, E.; Cao, Y.; Levitan, D.

    2012-01-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/ ; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 13 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B ), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org ).

  17. PTF weekly SN discovery report, July 28, 2011

    Science.gov (United States)

    Gal-Yam, A.; Nugent, P.; Maguire, K.; Pan, Y.-C.; Sullivan, M.; Howell, A.

    2011-07-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 8 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B ), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org ).

  18. PTF weekly SN discovery report, August 13, 2011

    Science.gov (United States)

    Gal-Yam, Avishay; Xu, Dong; Nugent, Peter; Horesh, Assaf; Cao, Yi; Walker, Emma

    2011-08-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 8 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B ), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org ).

  19. PTF weekly SN discovery report, March 9, 2012

    Science.gov (United States)

    Gal-Yam, Avishay; Ben-Ami, Sagi; Nugent, Peter; Levitan, D.; Silverman, J.; Morgan, A.; Nugent, P.; Miller, A.; Pan, Y.-C.

    2012-03-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/ ; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 11 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B ), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org ).

  20. PTF weekly SN discovery report, Sep. 2, 2011

    Science.gov (United States)

    Gal-Yam, Avishay; Xu, D.; Ben-Ami, S.; Arcavi, I.; Sternberg, A.; Nugent, Peter; Cao, Y.; Konidaris, N.; Levitan, D.; Maguire, K.; Pan, Y.-C.; Cenko, S. B.; Silverman, J.; Kandrashoff, T.; Bloom, J. S.; Walker, E.; Groot, P.

    2011-09-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/ ; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 21 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org).

  1. PTF weekly SN discovery report, July 21, 2011

    Science.gov (United States)

    Gal-Yam, A.; Yaron, O.; Arcavi, I.; Howell, A.; Nugen, P.

    2011-07-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 2 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B ), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org ).

  2. PTF weekly SN discovery report, December 31, 2011

    Science.gov (United States)

    Gal-Yam, A.; Arcavi, I.; Yaron, O.; Xu, D.; Nugent, P.; Pan, Y.-C.

    2011-12-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/ ; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 5 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B ), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org ).

  3. PTF weekly SN discovery report, October 21, 2011

    Science.gov (United States)

    Gal-Yam, Avishay; Ben-Ami, Sagi; Nugent, Peter; Cao, M.; Kasliwal, Y.; Sesar, Branimir; Sesar; Ptf

    2011-10-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 7 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org).

  4. PTF weekly SN discovery report, August 27, 2011

    Science.gov (United States)

    Gal-Yam, Avishay; Xu, D.; Ben-Ami, S.; Arcavi, I.; Sternberg, A.; Nugent, Peter; Cao, Y.; Konidaris, N.; Levitan, D.; Maguire, K.; Pan, Y.-C.; Cenko, S. B.; Silverman, J.; Kandrashoff, T.; Bloom, J. S.; Walker, E.; Groot, P.

    2011-09-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/ ; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 11 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org).

  5. PTF weekly SN discovery report, July 8, 2011

    Science.gov (United States)

    Gal-Yam, A.; Nugen, P.

    2011-07-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 11 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B ), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org ).

  6. PTF weekly SN discovery report, February 4, 2012

    Science.gov (United States)

    Gal-Yam, Avishay; Ben-Ami, Sagi; Arcavi, I.; Nugent, Peter; Levitan, D.; Cao, Y.; Horesh, A.; Bellm, E.; Matheson, T.

    2012-02-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/ ; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 20 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B ), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org ).

  7. PTF weekly SN discovery report, November 6, 2011

    Science.gov (United States)

    Gal-Yam, Avishay; Ben-Ami, S.; Yaron, O.; Nugent, P.; Kasliwal, M.; Cao, Y.; Levitan, D.; Sesar, B.; Tandulkar, S.; Groot, P.; Filippenko, A. V.; Cenko, S. B.; Silverman, D. Kasen. J.; Kandrashoff, M.; Blanchard, P.; Foley, R.

    2011-11-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 15 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org).

  8. PTF weekly SN discovery report, Sep. 9, 2011

    Science.gov (United States)

    Gal-Yam, Avishay; Arcavi, I.; Polishook, D.; Cao, Y.; Nugen, Peter

    2011-09-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 10 new spectroscopically confirmed supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B ), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org ).

  9. PTF SN discovery report, May-June 2012

    Science.gov (United States)

    Gal-Yam, Avishay; Ben-Ami, Sagi; Yaron, O.; Arcavi, I.; Nugent, Peter; Levitan, D.; Perley, D.; Kulkarni, S. R.; Sesar, B.; Cao, Y.; Bellm, E.; Barlow, T.; Silverman, J.; Clubb, K.; Miller, A.; Fox, O.; Pan, Y.-C.; Maguire, K.; Sullivan, M.; Walker, E.; Kasliwal, M.; White, C. J.; Graham, M.; Parrent, J.

    2012-07-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/ ; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 27 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B ), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org ).

  10. PTF weekly SN discovery report, August 6, 2011

    Science.gov (United States)

    Gal-Yam, A.; Xu, D.; Nugent, P.; Hsiao, E.; Levitan, D.; Maguire, K.; Pan, Y.-C.; Sullivan, M.; Groot, P.

    2011-08-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 10 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B ), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org ).

  11. PTF weekly SN discovery report, November 18, 2011

    Science.gov (United States)

    Gal-Yam, Avishay; Nugent, Peter; Hook, Isobel; Pan, Yen-Chen

    2011-11-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/ ; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 6 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B ), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org ).

  12. PTF discovers a young type IIn SN in NGC 151

    Science.gov (United States)

    Parrent, J.; Levitan, D.; Howell, A.; Thomas, R. C.; Nugent, P.; Sullivan, M.; Kasliwal, M.; Ofek, E. O.; Quimby, R.; Ben-Ami, S.; Xu, D.; Arcavi, I.; Gal-Yam, A.; Cenko, C. B.; Li, W.; Filippenko, A. V.

    2011-07-01

    The PTF (ATEL #1964, #3253; www.astro.caltech.edu/ptf; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of a new supernova in NGC 151. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B ), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org ).

  13. PTF weekly SN discovery report, December 8, 2011

    Science.gov (United States)

    Gal-Yam, Avishay; Yaron, O.; Ben-Ami, S.; Nugent, P. E.; Groot, P.; Tandulkar, S.; Horesh, E. Bellm. A.; Cao, Y.; Levitan, D.; Sesar, B.; Hook, I.; Pan, Y.-C.; Kandrashoff, M.; Blanchard, P.; Silverman, J.; Cenko, S. B.; Miller, A.; Filippenko, A. V.; Clubb, K. I.

    2011-12-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/ ; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 25 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org).

  14. PTF weekly SN discovery report, Sep. 23, 2011

    Science.gov (United States)

    Gal-Yam, Avishay; Nugent, Peter

    2011-09-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/ ; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 2 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org).

  15. PTF weekly SN discovery report, July 15, 2011

    Science.gov (United States)

    Gal-Yam, Avishay; Nugent, Peter; Hsiao, Eric; Graham, Melissa

    2011-07-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 2 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B ), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org ).

  16. PTF weekly SN discovery report, October 1, 2011

    Science.gov (United States)

    Gal-Yam, Avishay; Ben-Ami, Sagi; Xu, Dong; Nugent, Peter; Sesar, Branimir; Pan, Y.-C.; Silverman, J.; Cenko, S. B.; Filippenko, A.

    2011-10-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/ ; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 11 new supernovae. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B ), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org).

  17. Accountability for Project-Based Collaborative Learning

    Science.gov (United States)

    Jamal, Abu-Hussain; Essawi, Mohammad; Tilchin, Oleg

    2014-01-01

    One perspective model for the creation of the learning environment and engendering students' thinking development is the Project-Based Collaborative Learning (PBCL) model. This model organizes learning by collaborative performance of various projects. In this paper we describe an approach to enhancing the PBCL model through the creation of…

  18. Ectopic Ptf1a expression in murine ESCs potentiates endocrine differentiation and models pancreas development in vitro.

    Science.gov (United States)

    Nair, Gopika G; Vincent, Robert K; Odorico, Jon S

    2014-05-01

    Besides its role in exocrine differentiation, pancreas-specific transcription factor 1a (PTF1a) is required for pancreas specification from the foregut endoderm and ultimately for endocrine cell formation. Examining the early role of PTF1a in pancreas development has been challenging due to limiting amounts of embryonic tissue material for study. Embryonic stem cells (ESCs) which can be differentiated in vitro, and without limit to the amount of experimental material, can serve as a model system to study these early developmental events. To this end, we derived and characterized a mouse ESC line with tetracycline-inducible expression of PTF1a (tet-Ptf1a mESCs). We found that transient ectopic expression of PTF1a initiated the pancreatic program in differentiating ESCs causing cells to activate PDX1 expression in bud-like structures resembling pancreatic primordia in vivo. These bud-like structures also expressed progenitor markers characteristic of a developing pancreatic epithelium. The epithelium differentiated to generate a wave of NGN3+ endocrine progenitors, and further formed cells of all three pancreatic lineages. Notably, the insulin+ cells in the cultures were monohormonal, and expressed PDX1 and NKX6.1. PTF1a-induced cultures differentiated into significantly more endocrine and exocrine cells and the ratio of endocrine-to-exocrine cell differentiation could be regulated by retinoic acid (RA) and nicotinamide (Nic) signaling. Moreover, induced cultures treated with RA and Nic exhibited a modest glucose response. Thus, this tet-Ptf1a ESC-based in vitro system is a valuable new tool for interrogating the role of PTF1a in pancreas development and in directing differentiation of ESCs to endocrine cells.

  19. FIRE Classification of iPTF13bvn

    Science.gov (United States)

    Kasliwal, M. M.; Degenaar, N.; Polishook, D.

    2013-06-01

    We observed iPTF13bvn (ATEL#5137) with the Folded-port InfraRed Echellette (FIRE; Simcoe et al. 2010) spectrograph on the Magellan Baade telescope on UT 2013 Jun 19.04. The spectrum covers 0.8 to 2.5um and shows prominent P Cygni profile of Helium I at 1.083 um at avelocity of 23000 km/s. We note that the 2um Helium I line is relatively weak. Confirming the tentative classification based on the optical spectrum (ATEL#5142), we conclude this is a supernova of Type Ib.

  20. WWW COLLABORATIVE RECOMMENDATION BASED ON RELIABILITY

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Collaborative filtering recommender systems often suffer from the "Matchmaker" problem, which comes from the false assumption that users are counted only based on their similarity, and high similarity means good advisers. In order to find good advisers for every user, a matchmaker's reliability mode based on the algorithm deriving from Hits is constructed, and it is applied in the proposed World Wide Web (WWW)collaborative recommendation system. Comparative experimental results also show that our approach obviously improves the substantial performance.

  1. PTF weekly SN discovery report, May 29, 2012 (part 1)

    Science.gov (United States)

    Gal-Yam, Avishay; Yaron, O.; Ben-Ami, S.; Arcavi, I.; Nugent, P.; Cao, Y.; Perley, D.; Kulkarni, S.; Hook, I.; Pan, Y.-C.; Walker, E.; Cenko, S. B.; Silverman, J.; Clubb, K. I.; Miller, A.; Filippenko, A. V.; Parrent, J.; Graham, M.

    2012-05-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/ ; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 33 new supernovae (in this 2-part telegram). PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B ), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org ).

  2. PTF weekly SN discovery report, May 29, 2012 (Part 2)

    Science.gov (United States)

    Gal-Yam, Avishay; Yaron, O.; Ben-Ami, S.; Arcavi, I.; Nugent, P.; Cao, Y.; Perley, D.; Kulkarni, S.; Hook, I.; Pan, Y.-C.; Walker, E.; Cenko, S. B.; Silverman, J.; Clubb, K. I.; Miller, A.; Filippenko, A. V.; Parrent, J.; Graham, M.

    2012-05-01

    The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/ ; Law et al. 2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery of 33 new supernovae in this 2-part telegram. PTF discoveries are made by autonomous PTF software (Bloom et al. 2011, http://adsabs.harvard.edu/abs/2011arXiv1106.5491B ), as well as by the Galaxy Zoo Supernova Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org ).

  3. Collaboration in mindfulness-based cognitive therapy.

    Science.gov (United States)

    Felder, Jennifer N; Dimidjian, Sona; Segal, Zindel

    2012-02-01

    In this article, we describe the nature of therapeutic collaboration between psychotherapist and group participants in mindfulness-based cognitive therapy (MBCT), which occurs in a group format and incorporates cognitive therapy and mindfulness practices with the aim of preventing depression relapse. Collaboration is a central part of two components of MBCT: inquiry and leading mindfulness practices. During the process of inquiry, the therapist-initiated questions about the participant's moment-to-moment experience of the practice occurs in a context of curious, open, and warm attitudes. In addition, collaboration is maintained through co-participation in mindfulness practices. We provide a case illustration of collaboration in these contexts and conclude with recommendations for clinical practice.

  4. Collaborative environments for capability-based planning

    Science.gov (United States)

    McQuay, William K.

    2005-05-01

    Distributed collaboration is an emerging technology for the 21st century that will significantly change how business is conducted in the defense and commercial sectors. Collaboration involves two or more geographically dispersed entities working together to create a "product" by sharing and exchanging data, information, and knowledge. A product is defined broadly to include, for example, writing a report, creating software, designing hardware, or implementing robust systems engineering and capability planning processes in an organization. Collaborative environments provide the framework and integrate models, simulations, domain specific tools, and virtual test beds to facilitate collaboration between the multiple disciplines needed in the enterprise. The Air Force Research Laboratory (AFRL) is conducting a leading edge program in developing distributed collaborative technologies targeted to the Air Force's implementation of systems engineering for a simulation-aided acquisition and capability-based planning. The research is focusing on the open systems agent-based framework, product and process modeling, structural architecture, and the integration technologies - the glue to integrate the software components. In past four years, two live assessment events have been conducted to demonstrate the technology in support of research for the Air Force Agile Acquisition initiatives. The AFRL Collaborative Environment concept will foster a major cultural change in how the acquisition, training, and operational communities conduct business.

  5. Metallicity from Type II Supernovae from the (i)PTF

    CERN Document Server

    Taddia, F; Sollerman, J; Rubin, A; Leloudas, G; Gal-Yam, A; Arcavi, I; Cao, Y; Filippenko, A V; Graham, M L; Mazzali, P A; Nugent, P E; Pan, Y -C; Silverman, J M; Xu, D; Yaron, O

    2016-01-01

    Type IIP supernovae (SNe IIP) have recently been proposed as metallicity ($Z$) probes. The spectral models of Dessart et al. (2014) showed that the pseudo-equivalent width of Fe II $\\lambda$5018 (pEW$_{5018}$) during the plateau phase depends on the primordial $Z$, but there was a paucity of SNe IIP exhibiting pEW$_{5018}$ compatible with $Z < 0.4 {\\rm Z}_{\\odot}$. This lack might be due to some physical property of the SN II population, or to the fact that those SNe were discovered in luminous, metal-rich targeted galaxies. Here we use SN II observations from the untargeted (intermediate) Palomar Transient Factory [(i)PTF] survey, aiming to investigate the pEW$_{5018}$ distribution of this SN population and in particular to look for the presence of SNe II at lower $Z$. We perform pEW$_{5018}$ measurements on the spectra of a sample of 39 (i)PTF SNe II, selected to have well-constrained explosion epochs and light-curve properties (Rubin et al. 2015). Based on the comparison with the pEW$_{5018}$ spectral m...

  6. Rbms3, an RNA-binding protein, mediates the expression of Ptf1a by binding to its 3'UTR during mouse pancreas development.

    Science.gov (United States)

    Lu, Chung-Kuang; Lai, Yi-Chyi; Chen, Hau-Ren; Chiang, Ming-Ko

    2012-07-01

    The development of the pancreas is a complicated process that is regulated on several levels. Pancreas transcription factor 1, alpha subunit (Ptf1a), also known as p48, is a pancreas-specific basic helix-loop-helix transcription factor that is critical for both exocrine pancreas development and maintenance of acinar cell differentiation. Based on a differential screening assay, we identified Rbms3, a gene encoding a glycine-rich RNA-binding protein, to be specifically expressed in the neural tube and the pancreatic rudiment of e10.5 embryos. The presence of Rbms3 in the early developing pancreas suggests that specific post-transcriptional regulation mechanisms play an important role in controlling pancreas development. In this study, we show that Rbms3 binds to the 3'UTR of Ptf1a mRNA, but not the 3'UTR of Pdx1, which is another pancreatic transcription factor. The ectopic expression of Rbms3 stimulates the translation of a reporter gene carrying the Ptf1a 3'UTR. In addition, when Rbms3 expression is suppressed in the AR42J-B13 pancreatic exocrine cell line, the expression of Ptf1a is also down-regulated. These results suggest that binding of Rbms3 to the 3'UTR of Ptf1a regulates the production of the Ptf1a protein and, thereby, indirectly regulates the expression of the Ptf1a downstream target genes.

  7. APPLYING COLLABORATION SCRIPT IN KNOWLEDGE BASED SESSIONS

    Directory of Open Access Journals (Sweden)

    AIMAN TURANI

    2016-01-01

    Full Text Available Knowledge Based Processes, KBP, have been introduced to facilitate knowledge transfer among organizational and corporate employees. They stress on the key role of socialization and group meetings in promoting effective knowledge transfer. Meetings within virtual environment are becoming more and more used in today’s organizational settings. There are many conferencing tools that are used to facilitate such meetings. However, providing participants with a co nferencing or chatting tool and expecting them to transfer their knowledge to each other in a convenient way, could lead to many disappointments. CSCL, Computer Support for Collaborative Learning, is relatively a new discipline within teaching and learning field. Applying CSCL techniques and technologies in Knowledge Base Systems, KBS, would be a reasonable option since teaching and learning is essentially a process of knowledge transfer between instructors and students or collaboratively between students themselves. In this research we are focusing on the usage of Collaboration Script, CS, as a way to support knowledge transfer sessions in a structured and formal way. It facilitates sharing tacit knowledge via guided interpersonal interactions and turning them to explicit knowledge by capturing and retrieving these interactions. In this paper we are presenting the scripting structure of three common collaboration techniques used in Knowledge Base processes. As a proof of concept, two of these techniques are described using the collaboration scripting language, ColScript, that was introduced by us in an earlier research.

  8. Follow-up photometry of iPTF16geu

    Science.gov (United States)

    Lee, C.-H.

    2016-10-01

    We report follow-up photometry of the strongly lensed SNIa iPTF16geu (ATel #9603, #9626). We observed iPTF16geu on 2016/10/17 with the 2.5-m Isaac Newton Telescope (INT) + WFC at La Palma, under ~0.9" seeing condition.

  9. iPTF14yb: The First Discovery of a GRB Afterglow Independent of a High-Energy Trigger

    CERN Document Server

    Cenko, S Bradley; Perley, Daniel A; Horesh, Assaf; Corsi, Alessandra; Fox, Derek B; Cao, Yi; Kasliwal, Mansi M; Lien, Amy; Arcavi, Iair; Bloom, Joshua S; Butler, Nat R; Cucchiara, Antonino; de Diego, Jose A; Filippenko, Alexei V; Gal-Yam, Avishay; Gehrels, Neil; Georgiev, Leonid; Gonzalez, J Jesus; Graham, John F; Greiner, Jochen; Kann, D Alexander; Klein, Christopher R; Knust, Fabian; Kulkarni, S R; Kutyrev, Alexander; Laher, Russ; Lee, William H; Nugent, Peter E; Prochaska, J Xavier; Ramirez-Ruiz, Enrico; Richer, Michael G; Rubin, Adam; Urata, Yuji; Varela, Karla; Watson, Alan M; Wozniak, Przemek R

    2015-01-01

    We report here the discovery by the Intermediate Palomar Transient Factory (iPTF) of iPTF14yb, a luminous ($M_{r}\\approx-27.8$ mag), cosmological (redshift 1.9733), rapidly fading optical transient. We demonstrate, based on probabilistic arguments and a comparison with the broader population, that iPTF14yb is the optical afterglow of the long-duration gamma-ray burst GRB 140226A. This marks the first unambiguous discovery of a GRB afterglow prior to (and thus entirely independent of) an associated high-energy trigger. We estimate the rate of iPTF14yb-like sources (i.e., cosmologically distant relativistic explosions) based on iPTF observations, inferring an all-sky value of $\\Re_{\\mathrm{rel}}=610$ yr$^{-1}$ (68% confidence interval of 110-2000 yr$^{-1}$). Our derived rate is consistent (within the large uncertainty) with the all-sky rate of on-axis GRBs derived by the Swift satellite. Finally, we briefly discuss the implications of the nondetection to date of bona fide "orphan" afterglows (i.e., those lackin...

  10. Collaborative regression-based anatomical landmark detection

    Science.gov (United States)

    Gao, Yaozong; Shen, Dinggang

    2015-12-01

    Anatomical landmark detection plays an important role in medical image analysis, e.g. for registration, segmentation and quantitative analysis. Among the various existing methods for landmark detection, regression-based methods have recently attracted much attention due to their robustness and efficiency. In these methods, landmarks are localised through voting from all image voxels, which is completely different from the classification-based methods that use voxel-wise classification to detect landmarks. Despite their robustness, the accuracy of regression-based landmark detection methods is often limited due to (1) the inclusion of uninformative image voxels in the voting procedure, and (2) the lack of effective ways to incorporate inter-landmark spatial dependency into the detection step. In this paper, we propose a collaborative landmark detection framework to address these limitations. The concept of collaboration is reflected in two aspects. (1) Multi-resolution collaboration. A multi-resolution strategy is proposed to hierarchically localise landmarks by gradually excluding uninformative votes from faraway voxels. Moreover, for informative voxels near the landmark, a spherical sampling strategy is also designed at the training stage to improve their prediction accuracy. (2) Inter-landmark collaboration. A confidence-based landmark detection strategy is proposed to improve the detection accuracy of ‘difficult-to-detect’ landmarks by using spatial guidance from ‘easy-to-detect’ landmarks. To evaluate our method, we conducted experiments extensively on three datasets for detecting prostate landmarks and head & neck landmarks in computed tomography images, and also dental landmarks in cone beam computed tomography images. The results show the effectiveness of our collaborative landmark detection framework in improving landmark detection accuracy, compared to other state-of-the-art methods.

  11. Evaluation of Intelligent Grouping Based on Learners' Collaboration Competence Level in Online Collaborative Learning Environment

    Science.gov (United States)

    Muuro, Maina Elizaphan; Oboko, Robert; Wagacha, Waiganjo Peter

    2016-01-01

    In this paper we explore the impact of an intelligent grouping algorithm based on learners' collaborative competency when compared with (a) instructor based Grade Point Average (GPA) method level and (b) random method, on group outcomes and group collaboration problems in an online collaborative learning environment. An intelligent grouping…

  12. Activity-Based Collaboration for Interactive Spaces

    DEFF Research Database (Denmark)

    Bardram, Jakob Eyvind; Esbensen, Morten; Tabard, Aurélien

    2017-01-01

    Activity-based computing (ABC) is a conceptual and technological framework for designing interactive systems that offers a better mapping between the activities people conduct and the digital entities they use. In ABC, rather than interacting directly with lower-level technical entities like file......LabBench [2, 3]. The chapter discusses the benefits of activity-based collaboration support for these interactive spaces, while also discussing limitations and challenges to be addressed in further research....

  13. On the Task-based Collaborative Learning

    Institute of Scientific and Technical Information of China (English)

    曲囡囡; 马卓

    2008-01-01

    <正>Task-based language teaching(TBLT) has been a prevalent teaching practice in the TEFL field in the recent years and its momentum for striving to be the legitimate one has never ceased. The present study tries to provide a theoretical foundation for its application in the communicative learning approach of English as the second language(ESL),namely the collaborative learning mode.

  14. Expert system for web based collaborative CAE

    Science.gov (United States)

    Hou, Liang; Lin, Zusheng

    2006-11-01

    An expert system for web based collaborative CAE was developed based on knowledge engineering, relational database and commercial FEA (Finite element analysis) software. The architecture of the system was illustrated. In this system, the experts' experiences, theories and typical examples and other related knowledge, which will be used in the stage of pre-process in FEA, were categorized into analysis process and object knowledge. Then, the integrated knowledge model based on object-oriented method and rule based method was described. The integrated reasoning process based on CBR (case based reasoning) and rule based reasoning was presented. Finally, the analysis process of this expert system in web based CAE application was illustrated, and an analysis example of a machine tool's column was illustrated to prove the validity of the system.

  15. Study on affecting factors of collaborative product development based on collaboration hierarchy model

    Institute of Scientific and Technical Information of China (English)

    ZHANG Xiaodong; LI Yingzi; ZHANG Zhiqiang

    2007-01-01

    Aiming at the levels of collaborative degree in web-based product development,a collaboration hierarchy model of this product development is developed in this paper.Based on the model,the affecting factors on collaboration levels are analyzed systematically from many aspects,such as technology,organization and business.A gap analysis method is studied in detail,and is applied in a real project.The application shows that it can solve the diverse problems of collaborative product development effectively,and help enterprises find out the critical factors that affect the collaboration.

  16. Collaborative Representation based Classification for Face Recognition

    CERN Document Server

    Zhang, Lei; Feng, Xiangchu; Ma, Yi; Zhang, David

    2012-01-01

    By coding a query sample as a sparse linear combination of all training samples and then classifying it by evaluating which class leads to the minimal coding residual, sparse representation based classification (SRC) leads to interesting results for robust face recognition. It is widely believed that the l1- norm sparsity constraint on coding coefficients plays a key role in the success of SRC, while its use of all training samples to collaboratively represent the query sample is rather ignored. In this paper we discuss how SRC works, and show that the collaborative representation mechanism used in SRC is much more crucial to its success of face classification. The SRC is a special case of collaborative representation based classification (CRC), which has various instantiations by applying different norms to the coding residual and coding coefficient. More specifically, the l1 or l2 norm characterization of coding residual is related to the robustness of CRC to outlier facial pixels, while the l1 or l2 norm c...

  17. Kernel based collaborative recommender system for -purchasing

    Indian Academy of Sciences (India)

    M K Kavitha Devi; P Venkatesh

    2010-10-01

    Recommender system a new marketing strategy plays an important role particularly in an electronic commerce environment. Among the various recommender systems, collaborative recommender system (CRS) is widely used in a number of different applications such as recommending web pages, movies, tapes and items. CRS suffers from scalability, sparsity, and cold start problems. An intelligent integrated recommendation approach using radial basis function network (RBFN) and collaborative filtering (CF), based on Cover’s theorem, is proposed in order to overcome the traditional problems of CRS. The proposed system predicts the trend by considering both likes and dislikes of the active user. The empirical evaluation results reveal that the proposed approach is more effective than other existing approaches in terms of accuracy and relevance measure of recommendations.

  18. Collaborative virtual experience based on reconfigurable simulation

    Science.gov (United States)

    Shahab, Qonita M.; Kwon, Yong-Moo; Ko, Heedong

    2006-10-01

    Virtual Reality simulation enables immersive 3D experience of a Virtual Environment. A simulation-based Virtual Environment can be used to map real world phenomena onto virtual experience. With a reconfigurable simulation, users can reconfigure the parameters of the involved objects, so that they can see different effects from the different configurations. This concept is suitable for a classroom learning of physics law. This research studies the Virtual Reality simulation of Newton's physics law on rigid body type of objects. With network support, collaborative interaction is enabled so that people from different places can interact with the same set of objects in immersive Collaborative Virtual Environment. The taxonomy of the interaction in different levels of collaboration is described as: distinct objects and same object, in which there are same object - sequentially, same object - concurrently - same attribute, and same object - concurrently - distinct attributes. The case studies are the interaction of users in two cases: destroying and creating a set of arranged rigid bodies. In Virtual Domino, users can observe physics law while applying force to the domino blocks in order to destroy the arrangements. In Virtual Dollhouse, users can observe physics law while constructing a dollhouse using existing building blocks, under gravity effects.

  19. EVLA Observations of an Extremely Young Type Ia Supernova PTF10ygu

    Science.gov (United States)

    Kasliwal, Mansi; Frail, Dale; Nugent, Peter; Howell, Andy; Sullivan, Mark; Gal-Yam, Avishay; Arcavi, Iair; Quimby, Robert; Ofek, Eran; Kulkarni, Shri; Yuan, Fang; Akerlof, Carl; McKay, Tim

    2010-10-01

    We triggered our NRAO Target Of Opportunity program "Exploring Transients in the Local Universe" and used the Expanded Very Large Array (EVLA) to observe PTF10ygu (ATEL#2934), an extremely young Type Ia supernova discovered by the Palomar Transient Factory. The EVLA observations were made on 2010 October 16.68 UT, when this Type Ia supernova was two weeks before maximum light (based on contemporaneous spectroscopy), one of the youngest supernovae to be observed in the radio.

  20. VizieR Online Data Catalog: PTF 12dam & iPTF 13dcc follow-up (Vreeswijk+, 2017)

    Science.gov (United States)

    Vreeswijk, P. M.; Leloudas, G.; Gal-Yam, A.; De Cia, A.; Perley, D. A.; Quimby, R. M.; Waldman, R.; Sullivan, M.; Yan, L.; Ofek, E. O.; Fremling, C.; Taddia, F.; Sollerman, J.; Valenti, S.; Arcavi, I.; Howell, D. A.; Filippenko, A. V.; Cenko, S. B.; Yaron, O.; Kasliwal, M. M.; Cao, Y.; Ben-Ami, S.; Horesh, A.; Rubin, A.; Lunnan, R.; Nugent, P. E.; Laher, R.; Rebbapragada, U. D.; Wozniak, P.; Kulkarni, S. R.

    2017-08-01

    Spectroscopic follow-up observations of PTF 12dam were performed with the Kast Spectrograph at the Lick 3m Shane telescope, and the Low Resolution Imaging Spectrograph (LRIS) at the Keck-I 10m telescope (on Mauna Kea, Hawaii) on 2012 May 20, 21, and 22. The full spectroscopic sequence of PTF 12dam will be presented by R. M. Quimby et al. (2016, in preparation). PTF 12dam was imaged with the Palomar Oschin 48 inch (P48) (i)PTF survey telescope in the Mould R filter, the Palomar 60 inch (P60) and CCD camera in Johnson B and Sloan Digital Sky Survey (SDSS) gri, the Las Cumbres Observatory Global Telescope Network (LCOGT) in SDSS r, and LRIS mounted on the 10m Keck-I telescope in Rs. iPTF 13dcc has not had any exposure in the literature yet. It was flagged as a transient source on 2013 August 29. Spectroscopic follow-up observations spanning 2013 Nov 26 to 2014 Jan 16 were performed with the Double Spectrograph (DBSP) at the Palomar 200 inch (P200), LRIS at Keck-I, and the Inamori-Magellan Areal Camera & Spectrograph (IMACS) at the Magellan Baade telescope, showing iPTF 13dcc to be an SLSN at z=0.4305. iPTF 13dcc was imaged with the P48 Oschin (i)PTF survey telescope in the Mould R filter, the P60 in SDSS gri, the 4.3m Discovery Channel Telescope (DCT, at Lowell Observatory, Arizona) with the Large Monolithic Imager (LMI) in SDSS ri, and finally with the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) Wide-Field Camera using filter F625W (under program GO-13858; P.I. A. De Cia). (3 data files).

  1. Optical Variability of AGNs in the PTF/iPTF Survey

    Science.gov (United States)

    Caplar, Neven; Lilly, Simon J.; Trakhtenbrot, Benny

    2017-01-01

    We characterize the optical variability of quasars in the Palomar Transient Factory and intermediate Palomar Transient Factory (PTF/iPTF) surveys. We re-calibrate the r-band light curves for ∼28,000 luminous, broad-line active galactic nuclei from the SDSS, producing a total of ∼2.4 million photometric data points. We utilize both the structure function (SF) and power spectrum density (PSD) formalisms to search for links between the optical variability and the physical parameters of the accreting supermassive black holes that power the quasars. The excess variance (SF2) of the quasar sample tends to zero at very short time separations, validating our re-calibration of the time-series data. We find that the the amplitude of variability at a given time-interval, or equivalently the timescale of variability to reach a certain amplitude, is most strongly correlated with luminosity with weak or no dependence on black hole mass and redshift. For a variability level of SF(τ) = 0.07 mag, the timescale has a dependency of τ \\propto {L}0.4. This is broadly consistent with the expectation from a simple Keplerian accretion disk model, which provides τ \\propto {L}0.5. The PSD analysis also reveals that many quasar light curves are steeper than a damped random walk. We find a correlation between the steepness of the PSD slopes, specifically the fraction of slopes steeper than 2.5, and black hole mass, although we cannot exclude the possibility that luminosity or Eddington ratio are the drivers of this effect. This effect is also seen in the SF analysis of the (i)PTF data, and in a PSD analysis of quasars in the SDSS Stripe 82.

  2. Low-Cost Planar PTF Sensors for the Identity Verification of Smartcard Holders

    NARCIS (Netherlands)

    Henderson, N.J.; Papakostas, T.V.; White, N.M.; Hartel, P.H.

    2002-01-01

    The properties of mechanical flexibility, low-cost and planar geometry make polymer thick film (PTF) sensors attractive for embedded smartcard biometrics. PTF piezoelectric and piezoresistive pressure sensors are investigated for their potential to capture spatial human characteristics. However, it

  3. Parametric Collaborative Design of Network-based Mechanical Products

    Institute of Scientific and Technical Information of China (English)

    WU Shu-fang; YU Guo-jun; WANG Zong-yan; SU Tie-xiong; QIN Hui-bin

    2012-01-01

    Aiming at the problems of low-level information sharing, slow transmission and repetitive work in the designing process of product series, the internet-oriented parametric collaborative design method is proposed, in which the problems of sharing conflict and network heterogeneous in the distributed collaborative design are analyzed, and the construction method of collaborative design platforms based on PDMWorks Workgroup is put forward. Through studying the mechanism of roles distribution and function allocation and data concurrency control, the communication mechanism of internet-oriented collaborative design is formulated. On the basis of structure features of overhead travelling crane, through combining parametric variant design with collaborative design, internet-oriented parametric collaborative design system of overhead travelling crane is developed and verified through main girder design. In the paper, the internet-oriented parametric collaborative design method is proposed, aiming to solve the problems of low-level information sharing, slow transmission and repetitive work in the designing process of product series. The problems of sharing conflict and network heterogeneous in the distributed collaborative design are analyzed. The construction method of collaborative design platforms based on PDMWorks Workgroup is put forward. The communication mechanism of internet-oriented collaborative design is formulated, through studying the mechanism of roles distribution and function allocation and data concurrency control. On the basis of structure features of overhead travelling crane, through combining parametric variant design with collaborative design, internet-oriented parametric collaborative design system of overhead travelling crane is developed and verified through main girder design.

  4. Real-time collaboration in activity-based architectures

    DEFF Research Database (Denmark)

    Bardram, Jakob Eyvind; Christensen, Henrik Bærbak

    2004-01-01

    With the growing research into mobile and ubiquitous computing, there is a need for addressing how such infrastructures can support collaboration between nomadic users. We present the activity based computing paradigm and outline a proposal for handling collaboration in an activity......-based architecture. We argue that activity-based computing establishes a natural and sound conceptual and architectural basis for session management in real-time, synchronous collaboration....

  5. Optical variability of AGN in the PTF/iPTF survey

    CERN Document Server

    Caplar, Neven; Trakhtenbrot, Benny

    2016-01-01

    We characterize the optical variability of quasars in the intermediate Palomar Transient Factory (iPTF) and Palomar Transient Factory (PTF) surveys. We re-calibrate the $r$-band light curves for $\\sim$28,000 luminous, broad-line AGNs from the SDSS, producing a total of $\\sim$2.4 million photometric data points. We utilize both the structure function (SF) and power spectrum density (PSD) formalisms to search for links between the optical variability and the physical parameters of the accreting supermassive black holes that power the quasars. The excess variance (SF$^{2}$) of the quasar sample tends to zero at very short time separations, validating our re-calibration of the time-series data. We find that the the amplitude of variability at a given time-interval, or equivalently the time-scale of variability to reach a certain amplitude, is most strongly correlated with luminosity with weak or no dependence on black hole mass and redshift. For a variability level of SF($\\tau$)=0.07 mag, the time-scale has a dep...

  6. Collaboration

    Science.gov (United States)

    King, Michelle L.

    2010-01-01

    This article explores collaboration between library media educators and regular classroom teachers. The article focuses on the context of the issue, positions on the issue, the impact of collaboration, and how to implement effective collaboration into the school system. Various books and professional journals are used to support conclusions…

  7. Proposing a Wiki-Based Technique for Collaborative Essay Writing

    Directory of Open Access Journals (Sweden)

    Mabel Ortiz Navarrete

    2014-10-01

    Full Text Available This paper aims at proposing a technique for students learning English as a foreign language when they collaboratively write an argumentative essay in a wiki environment. A wiki environment and collaborative work play an important role within the academic writing task. Nevertheless, an appropriate and systematic work assignment is required in order to make use of both. In this paper the proposed technique when writing a collaborative essay mainly attempts to provide the most effective way to enhance equal participation among group members by taking as a base computer mediated collaboration. Within this context, the students’ role is clearly defined and individual and collaborative tasks are explained.

  8. A Response to "School-Based Collaboration with Families."

    Science.gov (United States)

    Nicoll, William G.

    1994-01-01

    A response to ideas set forth in J. Brien O'Callaghan's article, "School-Based Collaboration with Families: An Effective Model for a Society in Crisis," this article applauds and discusses school-based collaboration. Areas of concern are unfounded diagnostic assumptions, questionable ethical behavior, and limited breadth and scope of suggested…

  9. Knowledge Management Approaches in Portal-Based Collaborative

    Directory of Open Access Journals (Sweden)

    Mihaela I. MUNTEAN

    2009-01-01

    Full Text Available Collaboration involves a different approach to business – focused on managing business relationships between people, within or without groups, and within and between organizations. Collaborative enterprises differ from other business in a number of ways and collaborative working needs to be simultaneously a business philosophy, strategy and operational working. Effective collaboration unlocks the potential of the collective knowledge and intellectual capital of the organization and its networks of business partners, suppliers and customers. At the core of true collaboration is the ability to share and catalogue knowledge, ideas, standards, best practices, and lessons learned and to be able to retrieve that knowledge from anywhere at any time. Knowledge management is not a goal by itself. Businesses don't exist with the purpose of spreading and advancing knowledge, they exist for selling competitive products and services of high quality. Based on these considerations, we propose some knowledge management approaches for portal-based collaborative environments.

  10. A Competence-Based Collaborative Network: The West Midlands Collaborative Commerce Marketplace

    OpenAIRE

    Cheung, Yen; Scheepers, Helana; Swift, Mark; Lee, Vincent; Bal, Jay

    2010-01-01

    International audience; We present a competence-based collaborative network, the West Midlands Collaborative Commerce Marketplace (WMCCM) that was successfully employed to gain new business opportunities for SMEs in the West Midlands region of the UK. The competence profiling methodology employed places an emphasis on what SMEs are capable of doing rather than what products they make. This generates an increased number and wider range of enquiries to the SME. Further, a combination of tender ...

  11. Distributed collaborative CAD system based on Web Service

    Institute of Scientific and Technical Information of China (English)

    欧阳应秀; 唐敏; 林军呈; 董金祥

    2004-01-01

    This paper presents a novel Web Service based distributed collaborative CAD system employing feature as its collaborative design element and uses XML to define feature operations and communication protocol between the server and the client. To reduce network load and increase response ability of the system, the feature information is updated incrementally on the client. The system supports collaborative designing on heterogeneous platforms. Its framework and communication protocols are analyzed in detail. The experimental results from the developed prototype system showed that it can effectively support collaborative design under the distributed environment.

  12. Discovery of a Luminous Supernova, PTF10vqv

    Science.gov (United States)

    Quimby, R. M.; Kulkarni, S.; Ofek, E.; Kasliwal, M. M.; Gal-Yam, A.; Ben-Ami, S.; Badenes, C.; Sternberg, A.; Botyanszki, J.; Nugent, P. E.; Howell, D. A.

    2010-10-01

    We report the discovery of an optical transient, PTF10vqv, in R- band images obtained with the 1.2-m Oschin telescope at Palomar Observatory in the course of the Palomar Transient Factory survey (Law et al., 2009; Rau et al., 2009).

  13. Collaborative Tasks in Wiki-Based Environment in EFL Learning

    Science.gov (United States)

    Zou, Bin; Wang, Dongshuo; Xing, Minjie

    2016-01-01

    Wikis provide users with opportunities to post and edit messages to collaborate in the language learning process. Many studies have offered findings to show positive impact of Wiki-based language learning for learners. This paper explores the effect of collaborative task in error correction for English as a Foreign Language learning in an online…

  14. Doing Outcomes-Based Collaborative Teaching and Learning in Asia

    Science.gov (United States)

    van Schalkwyk, Gertina J.

    2015-01-01

    This chapter focuses on applying the concepts of outcomes-based collaborative teaching and learning in an Asian context and with students coming from a Confucian heritage culture and explores examples of how to implement effective collaborative teaching and learning in an Asian higher education setting.

  15. Collaborative Time-based Case Work

    DEFF Research Database (Denmark)

    Bohøj, Morten; Bouvin, Niels Olof

    2009-01-01

    We explore in this paper using timelines to represent bureaucratic processes in a municipal setting. The system described herein enables citizens and case workers to collaborate over the application for and configuration of parental leave, which is a highly involved process under Danish law....

  16. Wiki Based Collaborative Learning in Interuniversity Scenarios

    Science.gov (United States)

    Katzlinger, Elisabeth; Herzog, Michael A.

    2014-01-01

    In business education advanced collaboration skills and media literacy are important for surviving in a globalized business where virtual communication between enterprises is part of the day-by-day business. To transform these global working situations into higher education, a learning scenario between two universities in Germany and Austria was…

  17. Collaboration.

    Science.gov (United States)

    McDonald, Meme; Pryor, Boori Monty

    2000-01-01

    Describes, in the words of two Australian authors (one Aboriginal and one European-Australian), how they work together when they write books together, and how their collaboration goes beyond the two of them. (SR)

  18. Agent-Based Collaborative Traffic Flow Management Project

    Data.gov (United States)

    National Aeronautics and Space Administration — We propose agent-based game-theoretic approaches for simulation of strategies involved in multi-objective collaborative traffic flow management (CTFM). Intelligent...

  19. Using Agents in Web-Based Constructivist Collaborative Learning System

    Institute of Scientific and Technical Information of China (English)

    刘莹; 林福宗; 王雪

    2004-01-01

    Web-based learning systems are one of the most interesting topics in the area of the application of computers to education. Collaborative learning, as an important principle in constructivist learning theory, is an important instruction mode for open and distance learning systems. Through collaborative learning, students can greatly improve their creativity, exploration capability, and social cooperation. This paper used an agent-based coordination mechanism to respond to the requirements of an efficient and motivating learning process. This coordination mechanism is based on a Web-based constructivist collaborative learning system, in which students can learn in groups and interact with each other by several kinds of communication modes to achieve their learning objectives efficiently and actively. In this learning system, artificial agents represent an active part in the collaborative learning process; they can partially replace human instructors during the multi-mode interaction of the students.

  20. PTF11agg AS THE FIRST EVIDENCE FOR REVERSE SHOCK EMISSION FROM A POST-MERGER MILLISECOND MAGNETAR

    Energy Technology Data Exchange (ETDEWEB)

    Wang Lingjun; Dai Zigao, E-mail: dzg@nju.edu.cn [School of Astronomy and Space Science, Nanjing University, Nanjing (China)

    2013-09-10

    Based on the stiff equations of state of neutron stars (NS) and the discovery of high-mass NSs, it is highly probable that a NS-NS merger will result in a rapidly rotating massive magnetar. The central magnetar will dissipate its rotational energy to the outflow by injecting Poynting flux, which will become lepton-dominated so that a long-lasting reverse shock (RS) develops. We calculate the emission of the RS as well as the emission of forward shock (FS) and find that, in most cases, the RS emission is stronger than FS emission. It is found that the recently discovered transient, PTF11agg, can be neatly accounted for by the RS emission powered by a millisecond magnetar. Other alternative models have been considered and cannot explain the observed light curves well. We therefore suggest that PTF11agg is the first evidence for RS emission from a post-merger millisecond magnetar.

  1. Using a Wiki-Based Collaborative Process Writing Pedagogy to Facilitate Collaborative Writing among Chinese Primary School Students

    Science.gov (United States)

    Li, Xuanxi; Chu, Samuel Kai Wah; Ki, Wing Wah; Woo, Matsuko

    2012-01-01

    This case study explored collaborative writing in Chinese among 59 primary four Chinese students using a "Wiki-based Collaborative Process Writing Pedagogy" (WCPWP) in Shenzhen, China. It aimed mainly to design and orchestrate a WCPWP in order to facilitate students' Chinese writing. It investigated students' collaborative writing process and…

  2. Project-based learning in Geotechnics: cooperative versus collaborative teamwork

    Science.gov (United States)

    Pinho-Lopes, Margarida; Macedo, Joaquim

    2016-01-01

    Since 2007/2008 project-based learning models have been used to deliver two fundamental courses on Geotechnics in University of Aveiro, Portugal. These models have evolved and have encompassed either cooperative or collaborative teamwork. Using data collected in five editions of each course (Soil Mechanics I and Soil Mechanics II), the different characteristics of the models using cooperative or collaborative teamwork are pointed out and analysed, namely in terms of the students' perceptions. The data collected include informal feedback from students, monitoring of their marks and academic performance, and answers to two sets of questionnaires: developed for these courses, and institutional. The data indicate students have good opinion of the project-based learning model, though collaborative teamwork is the best rated. The overall efficacy of the models was analysed (sum of their effectiveness, efficiency and attractiveness). The collaborative model was found more adequate.

  3. Collaborative learning model inquiring based on digital game

    Science.gov (United States)

    Yuan, Jiugen; Xing, Ruonan

    2012-04-01

    With the development of computer education software, digital educational game has become an important part in our life, entertainment and education. Therefore how to make full use of digital game's teaching functions and educate through entertainment has become the focus of current research. The thesis make a connection between educational game and collaborative learning, the current popular teaching model, and concludes digital game-based collaborative learning model combined with teaching practice.

  4. Distinct enhancers of ptf1a mediate specification and expansion of ventral pancreas in zebrafish.

    Science.gov (United States)

    Pashos, Evanthia; Park, Joon Tae; Leach, Steven; Fisher, Shannon

    2013-09-15

    Development of the pancreas and cerebellum require Pancreas-specific transcription factor-1a (Ptf1a), which encodes a subunit of the transcription factor complex PTF1. Ptf1a is required in succession for specification of the pancreas, proper allocation of pancreatic progenitors to endocrine and exocrine fates, and the production of digestive enzymes from the exocrine acini. In several neuronal structures, including the cerebellum, hindbrain, retina and spinal cord, Ptf1a is transiently expressed and promotes inhibitory neuron fates at the expense of excitatory fates. Transcription of Ptf1a in mouse is maintained in part by PTF1 acting on an upstream autoregulatory enhancer. However, the transcription factors and enhancers that initially activate Ptf1a expression in the pancreas and in certain structures of the nervous system have not yet been identified. Here we describe a zebrafish autoregulatory element, conserved among teleosts, with activity similar to that described in mouse. In addition, we performed a comprehensive survey of all non-coding sequences in a 67kb interval encompassing zebrafish ptf1a, and identified several neuronal enhancers, and an enhancer active in the ventral pancreas prior to activation of the autoregulatory enhancer. To test the requirement for autoregulatory control during pancreatic development, we restored ptf1a function through BAC transgenesis in ptf1a morphants, either with an intact BAC or one lacking the autoregulatory enhancer. We find that ptf1a autoregulation is required for development of the exocrine pancreas and full rescue of the ptf1a morphant phenotype. Similarly, we demonstrate that a ptf1a locus lacking the early enhancer region is also capable of rescue, but only supports formation of a hypoplastic exocrine pancreas. Through our dissection of the complex regulatory control of ptf1a, we identified separate cis-regulatory elements that underlie different aspects of its expression and function, and further demonstrated

  5. Discovery of a Super-Luminous Supernova, PTF12dam

    Science.gov (United States)

    Quimby, R. M.; Arcavi, I.; Sternberg, A.; Ben-Ami, S.; Yaron, O.; Gal-Yam, A.; Graham, M.; Cenko, S. B.; Filippenko, A. V.; Perley, D.; Cao, Y.; Kulkarni, S. R.

    2012-05-01

    The Palomar Transient Factory (harvard.edu/abs/2009PASP..121.1395L'>Law et al., 2009; harvard.edu/abs/2009PASP..121.1334R'>Rau et al., 2009) reports the discovery of an optical transient, PTF12dam. The source is located at RA = 14:24:46.20, Dec. = +46:13:48.3 (J2000), which is offset from a r=19.15 mag galaxy detected by the SDSS.

  6. Discovery of a Luminous Supernova, PTF11rks

    Science.gov (United States)

    Quimby, R. M.; Gal-Yam, A.; Arcavi, I.; Yaron, O.; Horesh, A.; Mooley, K.

    2011-12-01

    The Palomar Transient Factory (harvard.edu/abs/2009PASP..121.1395L'>Law et al., 2009; harvard.edu/abs/2009PASP..121.1334R'>Rau et al., 2009) reports the discovery of an optical transient, PTF11rks. The source is located at RA = 01:39:45.51, Dec. = +29:55:27.0 (J2000), which is offset from a faint (r~20.9 mag) galaxy detected by the SDSS.

  7. Discovery and redshift of an optical afterglow in 71 square degrees iPTF13bxl and GRB 130702A

    CERN Document Server

    Singer, Leo P; Kasliwal, Mansi M; Perley, Daniel A; Ofek, Eran O; Brown, Duncan A; Nugent, Peter E; Kulkarni, S R; Corsi, Alessandra; Frail, Dale A; Bellm, Eric; Mulchaey, John; Arcavi, Iair; Barlow, Tom; Bloom, Joshua S; Cao, Yi; Gehrels, Neil; Horesh, Assaf; Masci, Frank J; McEnery, Julie; Rau, Arne; Surace, Jason A; Yaron, Ofer

    2013-01-01

    We report the discovery of the optical afterglow of the gamma-ray burst (GRB) 130702A, identified upon searching 71 square degrees surrounding the Fermi Gamma-ray Burst Monitor (GBM) localization. Discovered and characterized by the intermediate Palomar Transient Factory (iPTF), iPTF13bxl is the first afterglow discovered solely based on a GBM localization. Real-time image subtraction, machine learning, human vetting, and rapid response multi-wavelength follow-up enabled us to quickly narrow a list of 27,004 optical transient candidates to a single afterglow-like source. Detection of a new, fading X-ray source by Swift and a radio counterpart by CARMA and the VLA confirmed the association between iPTF13bxl and GRB 130702A. Spectroscopy with the Magellan and Palomar 200-inch telescopes showed the afterglow to be at a redshift of z=0.145, placing GRB 130702A among the lowest redshift GRBs detected to date. The prompt gamma-ray energy release and afterglow luminosity are intermediate between typical cosmological...

  8. The PTF Orion Project: Eclipsing Binaries and Young Stellar Objects

    CERN Document Server

    van Eyken, Julian C; Rebull, Luisa M; Stauffer, John R; Akeson, Rachel L; Beichman, Charles A; Boden, Andrew F; von Braun, Kaspar; Gelino, Dawn M; Hoard, D W; Howell, Steve B; Kane, Stephen R; Plavchan, Peter; Ramírez, Solange V; Bloom, Joshua S; Cenko, S Bradley; Kasliwal, Mansi M; Kulkarni, Shrinivas R; Law, Nicholas M; Nugent, Peter E; Ofek, Eran O; Poznanski, Dovi; Quimby, Robert M; Grillmair, Carl J; Laher, Russ; Levitan, David; Mattingly, Sean; Surace, Jason A

    2011-01-01

    The Palomar Transient Factory (PTF) Orion project is an experiment within the broader PTF survey, a systematic automated exploration of the sky for optical transients. Taking advantage of the wide field of view available using the PTF camera at the Palomar 48" telescope, 40 nights were dedicated in December 2009-January 2010 to perform continuous high-cadence differential photometry on a single field containing the young (7-10Myr) 25 Ori association. The primary motivation for the project is to search for planets around young stars in this region. The unique data set also provides for much ancillary science. In this first paper we describe the survey and data reduction pipeline, and present initial results from an inspection of the most clearly varying stars relating to two of the ancillary science objectives: detection of eclipsing binaries and young stellar objects. We find 82 new eclipsing binary systems, 9 of which we are candidate 25 Ori- or Orion OB1a-association members. Of these, 2 are potential young...

  9. A population of short-period variable quasars from PTF as supermassive black hole binary candidates

    Science.gov (United States)

    Charisi, M.; Bartos, I.; Haiman, Z.; Price-Whelan, A. M.; Graham, M. J.; Bellm, E. C.; Laher, R. R.; Márka, S.

    2016-12-01

    Supermassive black hole binaries (SMBHBs) at sub-parsec separations should be common in galactic nuclei, as a result of frequent galaxy mergers. Hydrodynamical simulations of circum-binary discs predict strong periodic modulation of the mass accretion rate on time-scales comparable to the orbital period of the binary. As a result, SMBHBs may be recognized by the periodic modulation of their brightness. We conducted a statistical search for periodic variability in a sample of 35 383 spectroscopically confirmed quasars in the photometric data base of the Palomar Transient Factory (PTF). We analysed Lomb-Scargle periodograms and assessed the significance of our findings by modelling each individual quasar's variability as a damped random walk (DRW). We identified 50 quasars with significant periodicity beyond the DRW model, typically with short periods of a few hundred days. We find 33 of these to remain significant after a re-analysis of their periodograms including additional optical data from the intermediate-PTF and the Catalina Real-Time Transient Survey. Assuming that the observed periods correspond to the redshifted orbital periods of SMBHBs, we conclude that our findings are consistent with a population of unequal-mass SMBHBs, with a typical mass ratio as low as q ≡ M2/M1 ≈ 0.01.

  10. Epoch-based Application Collaboration for Sensing Data Analysis

    Institute of Scientific and Technical Information of China (English)

    HU Kan; LIU Yun-sheng; WEN Bing

    2008-01-01

    The application collaboration was addressed to provide energy-efficient data services for distributed sensing applications to collaboratively interacting to achieve a desired global objective not detectable by any single cluster. An epoch-based transaction model was proposed by using the concept of sphere of control (SoC), and a collaborative sensing application can be dynamically formed as a nested architecture composed of time-synchronized applications. By loosening the rigid constraints of ACID to adapt the requirements of sensor networks, the submission, rollback and consistency rules ware educed and a two-phrase submission protocol was designed. Finally, it was illustrated that the model is capable of providing an adaptive formal template for sensing application collaboration. Our performance evaluations show that by applying the two-phrase submission protocol, we can significantly improve the number of reported answers and response time, raise resource utilization, and reduce the energyconsumption and data loss.

  11. Collaborative Product Design for Tasks Sorting Based on Shortest Delivery

    Directory of Open Access Journals (Sweden)

    Xuedong Liang

    2016-01-01

    Full Text Available The “people’s innovation” can promote development in enterprises in urgent need of innovative product design. Collaborative product design can be a powerful tool for enterprises wishing to improve their market competitiveness and customer satisfaction. To reduce decision costs, improve efficiency, and solve other issues, promoting “people’s innovation” can play a vital role. With this focus, this paper examines products produced through “people’s innovation.” A collaborative design task scheduling problem is presented. The design tasks are sorted based on a minimum delivery cost principle, which is determined using weighted shortest processing time (WSPT rules and the shortest delivery time. The results show that distributed collaborative innovation can result in a reasonable arrangement for collaborative design tasks.

  12. Using a NIATx based local learning collaborative for performance improvement.

    Science.gov (United States)

    Roosa, Mathew; Scripa, Joseph S; Zastowny, Thomas R; Ford, James H

    2011-11-01

    Local governments play an important role in improving substance abuse and mental health services. The structure of the local learning collaborative requires careful attention to old relationships and challenges local governmental leaders to help move participants from a competitive to collaborative environment. This study describes one county's experience applying the NIATx process improvement model via a local learning collaborative. Local substance abuse and mental health agencies participated in two local learning collaboratives designed to improve client retention in substance abuse treatment and client access to mental health services. Results of changes implemented at the provider level on access and retention are outlined. The process of implementing evidence-based practices by using the Plan-Do-Study-Act rapid-cycle change is a powerful combination for change at the local level. Key lessons include: creating a clear plan and shared vision, recognizing that one size does not fit all, using data can help fuel participant engagement, a long collaborative may benefit from breaking it into smaller segments, and paying providers to offset costs of participation enhances their engagement. The experience gained in Onondaga County, New York, offers insights that serve as a foundation for using the local learning collaborative in other community-based organizations. Copyright © 2011 Elsevier Ltd. All rights reserved.

  13. COLLABORATION IN WEB BASED LEARNING: A SOCIAL COMPUTING PERSPECTIVE

    Directory of Open Access Journals (Sweden)

    C.Pooranachandran

    2011-02-01

    Full Text Available The rapid advance of Information Communication Technology [ICT] has enabled Higher Education Institutions to reach out and educate students transcending the barriers of time and space. This technology supports structured, web-based learning activities, and provides diverse multilingual and multicultural settings and also facilities for self assessment. Structured collaboration, in the conventionaleducation system, has proven itself a successful and powerful learning method. Online learners do not enjoy the same collaborative benefits as face-to-face learners because the technology provides no guidance or direction during the online discussion sessions. This paper presents a Web Based Learning Environment [WBLE] from the perspective of social computing to bring collaborative learning benefits to online learners. The paper also highlights how the deployment of social computing tools can support the creation of an open and socially shared information space for better collaboration among the learners. With Social Network Analysis [SNA] techniques, collaboration among twenty learners is explored and metrics such as in-degree, out-degree and Betweenness and collaborative network mapping are presented.

  14. Web-based Collaborative learning in secondary education: Teachers’ reflection

    Directory of Open Access Journals (Sweden)

    Hsi-Chi Hsiao

    2010-06-01

    Full Text Available This article is based on the researchers’ reflections after twice participating in a Web-based Collaborative Learning Program Contest. The contests were held by Asia-Pacific Economic Cooperation (APEC Cyber Academy (ACA. In collaborative learning, teachers are expected to provide participants with scaffolding assistance. The ACA is designed to provide student-centered activities for enhancing skills in information and communication technologies. Students are expected to find data, prepare presentations, and report their topics in English to communicate with other teams from other countries. During these processes, the researcher tried to apply theoretical models such as computerized instruction and topic based learning. The results of this study show the various benefits of Web-based Collaborative Learning for students and teachers. This study also includes several recommendations for primary and secondary schools.

  15. Value concepts and value based collaboration in building projects

    DEFF Research Database (Denmark)

    Jensen, Per Anker

    2005-01-01

    of design strategies are identified. The concept and methods of value based management and collaboration is discussed in this context. The paper is mainly theoretical and based on work during a MBA study in 2002-04 as well as many years of experience as building client and facilities manager....

  16. Cloud-Based Collaborative Writing and the Common Core Standards

    Science.gov (United States)

    Yim, Soobin; Warschauer, Mark; Zheng, Binbin; Lawrence, Joshua F.

    2014-01-01

    The Common Core State Standards emphasize the integration of technology skills into English Language Arts (ELA) instruction, recognizing the demand for technology-based literacy skills to be college- and career- ready. This study aims to examine how collaborative cloud-based writing is used in in a Colorado school district, where one-to-one…

  17. Virtual Portfolios for Collaboration in Distributed Web-Based Learning.

    Science.gov (United States)

    Sorensen, Elsebeth Korsgaard; Tolsby, Haakon; Dirckinck-Holmfeld, Lone

    This paper addresses the problems of collaboration in distributed Web-based learning. It reviews, treats and discusses these problems from the learning theoretical perspective of "communities of practice" as presented by Etienne Wenger (1998), with reference to past and future Web-based designs. The paper suggests the concept and design of virtual…

  18. Collaborative Paper-Based Annotation of Lecture Slides

    Science.gov (United States)

    Steimle, Jurgen; Brdiczka, Oliver; Muhlhauser, Max

    2009-01-01

    In a study of notetaking in university courses, we found that the large majority of students prefer paper to computer-based media like Tablet PCs for taking notes and making annotations. Based on this finding, we developed CoScribe, a concept and system which supports students in making collaborative handwritten annotations on printed lecture…

  19. Cloud-Based Collaborative Writing and the Common Core Standards

    Science.gov (United States)

    Yim, Soobin; Warschauer, Mark; Zheng, Binbin; Lawrence, Joshua F.

    2014-01-01

    The Common Core State Standards emphasize the integration of technology skills into English Language Arts (ELA) instruction, recognizing the demand for technology-based literacy skills to be college- and career- ready. This study aims to examine how collaborative cloud-based writing is used in in a Colorado school district, where one-to-one…

  20. Student Collaboration and Standards-Based Music Learning: A Literature Review

    Science.gov (United States)

    Cangro, Richard

    2016-01-01

    This article is a review of relevant literature on collaborative, standards-based music learning. The review is organized as follows: (a) historical perspective, (b) collaborative music learning, (c) collaboration and creating, (d) collaboration and performing, (e) collaboration and responding, and (f) conclusions. In an effort to bridge the gap…

  1. Student Collaboration and Standards-Based Music Learning: A Literature Review

    Science.gov (United States)

    Cangro, Richard

    2016-01-01

    This article is a review of relevant literature on collaborative, standards-based music learning. The review is organized as follows: (a) historical perspective, (b) collaborative music learning, (c) collaboration and creating, (d) collaboration and performing, (e) collaboration and responding, and (f) conclusions. In an effort to bridge the gap…

  2. Research of Collaborative Filtering Recommendation Algorithm based on Network Structure

    Directory of Open Access Journals (Sweden)

    Hui PENG

    2013-10-01

    Full Text Available This paper combines the classic collaborative filtering algorithm with personalized recommendation algorithm based on network structure. For the data sparsity and malicious behavior problems of traditional collaborative filtering algorithm, the paper introduces a new kind of social network-based collaborative filtering algorithm. In order to improve the accuracy of the personalized recommendation technology, we first define empty state in the state space of multi-dimensional semi-Markov processes and obtain extended multi-dimensional semi-Markov processes which are combined with social network analysis theory, and then we get social network information flow model. The model describes the flow of information between the members of the social network. So, we propose collaborative filtering algorithm based on social network information flow model. The algorithm uses social network information and combines user trust with user interest and find nearest neighbors of the target user and then forms a project recommended to improve the accuracy of recommended. Compared with the traditional collaborative filtering algorithm, the algorithm can effectively alleviate the sparsity and malicious behavior problem, and significantly improve the quality of the recommendation system recommended.

  3. Collaborative work model based on peer-to-peer network

    Institute of Scientific and Technical Information of China (English)

    JIANG Jian-zhong; FU Li; ZHANG Xuan-peng; XU Chuan-yun

    2007-01-01

    In this paper, we incorporated peer-to-peer (P2P) concept with agent technology and put forward a collaborative work model based on peer-to-peer network (P2PCWM) after investigating into business demands of modern enterprises and problems prevailing in mainstream collaborative work systems based on central server. Theoretically, the P2PCWM can effectively overcome the problems in a conventional system with a central server and meet the practical demands of modern businesses. It is distinguished from other systems by its features of equality, openness, promptness, fairness, expandability and convenience.

  4. Torpedo Overall Multidisciplinary Design Based on Collaborative Optimization

    Institute of Scientific and Technical Information of China (English)

    YU De-hai; SONG Bao-wei; LI Jia-wang; YANG Shi-xing; GAO Zhi-yong

    2008-01-01

    A torpedo multidisciplinary design optimization (MDO) based on the collaborative optimization is proposed. Through decomposition and coordination, some problems in torpedo design such as multidisciplinary coupling, large data volume and complex data relationships can be solved. Taking aim at some complex problems in the torpedo design, such as computation in multidisciplinary design, organization, modeling and information exchange, the collaborative optimization methods based on approximate technology are presented. An example to increase the torpedo range is also given. It demonstrates that the method can converge quickly, has higher reliability and smaller data throughput, and is a very effective MDO method.

  5. A collaborative medical case authoring environment based on the UMLS.

    Science.gov (United States)

    Suebnukarn, Siriwan; Haddawy, Peter; Rhienmora, Phattanapon

    2008-04-01

    In this paper, we present a novel collaborative authoring tool that was designed to allow medical teachers to formalize and visualize their knowledge for medical intelligent tutoring systems. Our goal is to increase the efficiency and effectiveness in creating the domain model representing the problem solution--often referred to as the bottleneck in developing intelligent tutoring systems. We incorporate the Unified Medical Language System (UMLS) knowledge base to assist the authors in creating the problem solution collaboratively via a videoconferencing platform. The system consists of a shared workspace gathering information visualization and tools necessary for collaborative problem-solving tasks. We found that the authoring tool can be used to effectively elicit the knowledge structure of the domain model. This was achieved in hours compared to months for the conventional paper-based approach.

  6. PTF10nvg: An Outbursting Class I Protostar in the Pelican/North American Nebula

    CERN Document Server

    Covey, Kevin R; Miller, Adam A; Poznanski, Dovi; Cenko, S Bradley; Silverman, Jeffrey M; Bloom, Joshua S; Kasliwal, Mansi M; Fischer, William; Rayner, John; Rebull, Luisa M; Butler, Nathaniel R; Filippenko, Alexei V; Law, Nicholas M; Ofek, Eran O; Agueros, Marcel; Dekany, Richard G; Rahmer, Gustavo; Hale, David; Smith, Roger; Quimby, Robert M; Nugent, Peter; Jacobsen, Janet; Zolkower, Jeff; Velur, Viswa; Walters, Richard; Henning, John; Bui, Khanh; McKenna, Dan; Kulkarni, Shrinivas R; Klein, Christopher

    2010-01-01

    During a synoptic survey of the North American Nebula region, the Palomar Transient Factory (PTF) detected an optical outburst (dubbed PTF10nvg) associated with the previously unstudied flat or rising spectrum infrared source IRAS 20496+4354. The PTF R-band light curve reveals that PTF10nvg brightened by more than 5 mag during the current outburst, rising to a peak magnitude of R~13.5 in 2010 Sep. Follow-up observations indicate PTF10nvg has undergone a similar ~5 mag brightening in the K band, and possesses a rich emission-line spectrum, including numerous lines commonly assumed to trace mass accretion and outflows. Many of these lines are blueshifted by ~175 km/s from the North American Nebula's rest velocity, suggesting that PTF10nvg is driving an outflow. Optical spectra of PTF10nvg show several TiO/VO bandheads fully in emission, indicating the presence of an unusual amount of dense (> 10^10 cm^-3), warm (1500-4000 K) circumstellar material. Near-infrared spectra of PTF10nvg appear quite similar to a spe...

  7. Distributed collaborative environments for virtual capability-based planning

    Science.gov (United States)

    McQuay, William K.

    2003-09-01

    Distributed collaboration is an emerging technology that will significantly change how decisions are made in the 21st century. Collaboration involves two or more geographically dispersed individuals working together to share and exchange data, information, knowledge, and actions. The marriage of information, collaboration, and simulation technologies provides the decision maker with a collaborative virtual environment for planning and decision support. This paper reviews research that is focusing on the applying open standards agent-based framework with integrated modeling and simulation to a new Air Force initiative in capability-based planning and the ability to implement it in a distributed virtual environment. Virtual Capability Planning effort will provide decision-quality knowledge for Air Force resource allocation and investment planning including examining proposed capabilities and cost of alternative approaches, the impact of technologies, identification of primary risk drivers, and creation of executable acquisition strategies. The transformed Air Force business processes are enabled by iterative use of constructive and virtual modeling, simulation, and analysis together with information technology. These tools are applied collaboratively via a technical framework by all the affected stakeholders - warfighter, laboratory, product center, logistics center, test center, and primary contractor.

  8. Collaborative learning in condition based maintenance

    NARCIS (Netherlands)

    Koochaki, J.; Ao, SI; Gelman, L; Hukins, DWL; Hunter, A; Korsunsky, AM

    2009-01-01

    In recent years, the importance of reliable and consistent production equipments has increased. As a result, companies are shifting their maintenance policy from preventive maintenance towards Condition Based Maintenance (CBM). Despite the growing trend in this area and success stories of CBM implem

  9. The Healthy Weight Collaborative: Using Learning Collaboratives to Enhance Community-Based Prevention Initiatives Addressing Childhood Obesity

    OpenAIRE

    2013-01-01

    This report from the field describes the design, implementation, and early evaluation results of the Healthy Weight Collaborative, a federally supported learning collaborative to develop, test, and disseminate an integrated change package of six promising, evidence-based clinical and community-based strategies to prevent and treat obesity for children and families.

  10. A Collaborative Field-Based Urban Teacher Education Program.

    Science.gov (United States)

    Guyton, Edith; And Others

    1993-01-01

    Describes a 12-month, field-based, alternative teacher preparation program for individuals holding baccalaureate degrees in areas outside education who want master's degrees in early childhood education. The program involves collaboration between the State Department of Education, the Early Childhood Department of an urban university, and four…

  11. Web-Based Modelling and Collaborative Simulation of Declarative Processes

    DEFF Research Database (Denmark)

    Slaats, Tijs; Marquard, Morten; Shahzad, Muhammad

    2015-01-01

    two years we have taken this adoption of DCR Graphs to the next level and decided to treat the notation as a product of its own by developing a stand-alone web-based collaborative portal for the modelling and simulation of declarative workflows. The purpose of the portal is to facilitate end...

  12. Project-Based Learning in Geotechnics: Cooperative versus Collaborative Teamwork

    Science.gov (United States)

    Pinho-Lopes, Margarida; Macedo, Joaquim

    2016-01-01

    Since 2007/2008 project-based learning models have been used to deliver two fundamental courses on Geotechnics in University of Aveiro, Portugal. These models have evolved and have encompassed either cooperative or collaborative teamwork. Using data collected in five editions of each course (Soil Mechanics I and Soil Mechanics II), the different…

  13. WWW-based environments for collaborative group work

    NARCIS (Netherlands)

    Collis, Betty

    1998-01-01

    Since 1994, we have been involved in the design and use of a series of WWW-based environments to support collaborative group work for students in a technical university in The Netherlands. These environments, and the course re-design that accompanies each new environment, began in April 1994 and con

  14. Project-Based Learning in Geotechnics: Cooperative versus Collaborative Teamwork

    Science.gov (United States)

    Pinho-Lopes, Margarida; Macedo, Joaquim

    2016-01-01

    Since 2007/2008 project-based learning models have been used to deliver two fundamental courses on Geotechnics in University of Aveiro, Portugal. These models have evolved and have encompassed either cooperative or collaborative teamwork. Using data collected in five editions of each course (Soil Mechanics I and Soil Mechanics II), the different…

  15. COLLABORATIVE NETWORK SECURITY MANAGEMENT SYSTEM BASED ON ASSOCIATION MINING RULE

    Directory of Open Access Journals (Sweden)

    Nisha Mariam Varughese

    2014-07-01

    Full Text Available Security is one of the major challenges in open network. There are so many types of attacks which follow fixed patterns or frequently change their patterns. It is difficult to find the malicious attack which does not have any fixed patterns. The Distributed Denial of Service (DDoS attacks like Botnets are used to slow down the system performance. To address such problems Collaborative Network Security Management System (CNSMS is proposed along with the association mining rule. CNSMS system is consists of collaborative Unified Threat Management (UTM, cloud based security centre and traffic prober. The traffic prober captures the internet traffic and given to the collaborative UTM. Traffic is analysed by the Collaborative UTM, to determine whether it contains any malicious attack or not. If any security event occurs, it will reports to the cloud based security centre. The security centre generates security rules based on association mining rule and distributes to the network. The cloud based security centre is used to store the huge amount of tragic, their logs and the security rule generated. The feedback is evaluated and the invalid rules are eliminated to improve the system efficiency.

  16. A Collaborative Field-Based Urban Teacher Education Program.

    Science.gov (United States)

    Guyton, Edith; And Others

    1993-01-01

    Describes a 12-month, field-based, alternative teacher preparation program for individuals holding baccalaureate degrees in areas outside education who want master's degrees in early childhood education. The program involves collaboration between the State Department of Education, the Early Childhood Department of an urban university, and four…

  17. Ambient Sound-Based Collaborative Localization of Indeterministic Devices

    NARCIS (Netherlands)

    Kamminga, Jacob Wilhelm; Le Viet Duc, L Duc; Havinga, Paul J.M.

    2016-01-01

    Localization is essential in wireless sensor networks. To our knowledge, no prior work has utilized low-cost devices for collaborative localization based on only ambient sound, without the support of local infrastructure. The reason may be the fact that most low-cost devices are indeterministic and

  18. Network-based collaborative research environment LDRD final report

    Energy Technology Data Exchange (ETDEWEB)

    Davies, B.R.; McDonald, M.J.

    1997-09-01

    The Virtual Collaborative Environment (VCE) and Distributed Collaborative Workbench (DCW) are new technologies that make it possible for diverse users to synthesize and share mechatronic, sensor, and information resources. Using these technologies, university researchers, manufacturers, design firms, and others can directly access and reconfigure systems located throughout the world. The architecture for implementing VCE and DCW has been developed based on the proposed National Information Infrastructure or Information Highway and a tool kit of Sandia-developed software. Further enhancements to the VCE and DCW technologies will facilitate access to other mechatronic resources. This report describes characteristics of VCE and DCW and also includes background information about the evolution of these technologies.

  19. Skill Based Instruction of Collaborative Robots in Industrial Settings

    DEFF Research Database (Denmark)

    Schou, Casper; Andersen, Rasmus Skovgaard; Chrysostomou, Dimitrios

    2016-01-01

    During the past decades increasing need for more flexible and agile manufacturing equipment has spawned a growing interest in collaborative robots. Contrary to traditional industrial robots, collaborative robots are intended for operating alongside the production personnel in dynamic or semi......-structured human environments. To cope with the environment and workflow of humans, new programming and control methods are needed compared to those of traditional industrial robots. This paper presents a task level programming software tool allowing robotic novices to program industrial tasks on a collaborative...... robot. The tool called Skill Based System (SBS) is founded on the concept of robot skills, which are parameterizeable and task related actions of the robot. Task programming is conducted by first sequencing skills followed by an online parameterization performed using kinesthetic teaching. Through...

  20. Conscientization, Dialogue and Collaborative Problem Based Learning

    Directory of Open Access Journals (Sweden)

    Conscientization, Dialogue and Collaborative Problem Based Learning

    2013-08-01

    Full Text Available It has been argued that Paulo Freire’s concept of conscientization, where critical awareness and engagement are central to a problem-posing pedagogy, provides the philosophical principles to underpin Problem Based Learning (PBL. By using dialogue groups and a combination of learning strategies to discover the nature of a problem, understand its constraints, options, and multi-voiced perspectives, students can negotiate the sociological nature of its resolution and how competing perspectives may inform decision-making. This paper will first present the background of PBL, before it introduces and argues for reflective and reflexive learning environments founded within dialogical practices. It then provides tales from the field that illustrate how conscientization is enacted in the classroom, before considering implications and the Ten Principles of Critical Learning’ for reflective and reflexive practice. It concludes by arguing that conscientization and the dialogical process are central to PBL in order to engage the individual voice, foster democratic practices, and for the creation of shared meanings and understandings.

  1. Strategic collaborative model for evidence-based nursing practice.

    Science.gov (United States)

    Olade, Rosaline A

    2004-01-01

    To describe a model that has been developed to guide nurses and other health professionals in collaborative efforts toward evidence-based nursing practice. A review of literature was conducted using MEDLINE and CINAHL to search for articles on research utilization for evidence-based practice in health care delivery. Empirical studies; reviews; and theoretical, opinion, and information articles were included in the review in order to provide a more comprehensive view of the state of evidence-based nursing internationally. Findings revealed a number of barriers to evidence-based nursing practice, which have persisted over the last two decades, including inadequate knowledge of research among practicing nurses, lack of administrative support for research activities in clinical settings, lack of empowerment of nurses, and lack of needed mentoring from nursing research consultants. Barriers in the areas of nursing education and administrative support appear to be major. A need was identified for a pragmatic model that encourages cooperation and collaboration between educators/researchers in academia and the administrative leaders in the clinical facilities if evidence-based nursing practice is to become the norm. FRAMEWORK OF MODEL: The Tyler Collaborative Model is based on an eclectic approach to planned change for creating evidence-based practice. This model identifies a step-by-step process for change, while allowing for the opportunity to integrate any of the previously available methods of critical appraisal to determine the best evidence for practice in each clinical setting.

  2. Collaborative Personalized Web Recommender System using Entropy based Similarity Measure

    CERN Document Server

    Mehta, Harita; Bedi, Punam; Dixit, V S

    2012-01-01

    On the internet, web surfers, in the search of information, always strive for recommendations. The solutions for generating recommendations become more difficult because of exponential increase in information domain day by day. In this paper, we have calculated entropy based similarity between users to achieve solution for scalability problem. Using this concept, we have implemented an online user based collaborative web recommender system. In this model based collaborative system, the user session is divided into two levels. Entropy is calculated at both the levels. It is shown that from the set of valuable recommenders obtained at level I; only those recommenders having lower entropy at level II than entropy at level I, served as trustworthy recommenders. Finally, top N recommendations are generated from such trustworthy recommenders for an online user.

  3. Long-rising Type II supernovae from PTF and CCCP

    CERN Document Server

    Taddia, F; Fremling, C; Migotto, K; Gal-Yam, A; Armen, S; Duggan, G; Ergon, M; Filippenko, A V; Fransson, C; Hosseinzadeh, G; Kasliwal, M M; Laher, R R; Leloudas, G; Leonard, D C; Lunnan, R; Masci, F J; Moon, D -S; Silverman, J M; Wozniak, P R

    2016-01-01

    Supernova (SN) 1987A was a peculiar H-rich event with a long-rising (LR) light curve (LC), stemming from a compact blue supergiant star (BSG). Only a few similar events have been presented in the literature. We present new data for a sample of 6 LR Type II SNe (SNe II), 3 of which were discovered and observed by the Palomar Transient Factory (PTF) and 3 observed by the Caltech Core-Collapse Project (CCCP). Our aim is to enlarge the family of LR SNe II, characterizing their properties. Spectra, LCs, and host-galaxies (HG) of these SNe are presented. Comparisons with known SN 1987A-like events are shown, with emphasis on the absolute magnitudes, colors, expansion velocities, and HG metallicities. Bolometric properties are derived from the multiband LC. By modeling the early-time LCs with scaling relations derived from the SuperNova Explosion Code (SNEC) models of MESA progenitor stars, we estimate the progenitor radii of these SNe and other progenitor parameters. We present PTF12kso, a LR SN II with the largest...

  4. Collaborative Filtering Fusing Label Features Based on SDAE

    DEFF Research Database (Denmark)

    Huo, Huan; Liu, Xiufeng; Zheng, Deyuan

    2017-01-01

    problem, auxiliary information such as labels are utilized. Another approach of recommendation system is content-based model which can’t be directly integrated with CF-based model due to its inherent characteristics. Considering that deep learning algorithms are capable of extracting deep latent features......, this paper applies Stack Denoising Auto Encoder (SDAE) to content-based model and proposes LCF(Deep Learning for Collaborative Filtering) algorithm by combing CF-based model which fuses label features. Experiments on real-world data sets show that DLCF can largely overcome the sparsity problem...

  5. Relevance Feedback Algorithm Based on Collaborative Filtering in Image Retrieval

    Directory of Open Access Journals (Sweden)

    Yan Sun

    2010-12-01

    Full Text Available Content-based image retrieval is a very dynamic study field, and in this field, how to improve retrieval speed and retrieval accuracy is a hot issue. The retrieval performance can be improved when applying relevance feedback to image retrieval and introducing the participation of people to the retrieval process. However, as for many existing image retrieval methods, there are disadvantages of relevance feedback with information not being fully saved and used, and their accuracy and flexibility are relatively poor. Based on this, the collaborative filtering technology was combined with relevance feedback in this study, and an improved relevance feedback algorithm based on collaborative filtering was proposed. In the method, the collaborative filtering technology was used not only to predict the semantic relevance between images in database and the retrieval samples, but to analyze feedback log files in image retrieval, which can make the historical data of relevance feedback be fully used by image retrieval system, and further to improve the efficiency of feedback. The improved algorithm presented has been tested on the content-based image retrieval database, and the performance of the algorithm has been analyzed and compared with the existing algorithms. The experimental results showed that, compared with the traditional feedback algorithms, this method can obviously improve the efficiency of relevance feedback, and effectively promote the recall and precision of image retrieval.

  6. Diffusion-Based Recommendation in Collaborative Tagging Systems

    Institute of Scientific and Technical Information of China (English)

    SHANG Ming-Sheng; ZHANG Zi-Ke

    2009-01-01

    Recently, collaborative tagging systems have attracted more and more attention and have been widely applied in web systems. Tags provide highly abstracted information about personal preferences and item content, and therefore have the potential to help in improving better personalized recommendations. We propose a diffusion-based recommendation algorithm considering the personal vocabulary and evaluate it in a real-world dataset: Del.icio.us. Experimental results demonstrate that the usage of tag information can significantly improve the accuracy of personalized recommendations.

  7. A SEMANTIC-BASED COLLABORATIVE FILTERING FOR RECOMMENDATION SYSTEMS

    OpenAIRE

    D.Jagadish *, A.Vishnu Kumar, R.Mani Raj

    2016-01-01

    In the present days the web domain is improved with new types of services, with the increase in service and cloud computing. As a result new forms of web content collecting/designing is done based on the numerous openly available web services online. These services are utilized in many ways by different domains and with the exponential growth of these web services users are experiencing difficulties in finding and utilizing a best matching service for their mashup. A collaborative filtering a...

  8. Knowledge-Based Platform for Collaborative Innovation Development of Products

    Institute of Scientific and Technical Information of China (English)

    李莉敏; 唐文献; 方明伦; 杨延麟

    2005-01-01

    The platform of distributed design and resource sharing is important for medium-sized and small companies in developing products to improve competitiveness. As a background of creative product design, a knowledge model based on product collaborative innovation development of products (CIDP) is proposed. Characteristics of CIDP are analyzed, and the framework and key technologies of the CIDP-plafform based knowledge studied. Through integration of existing system and interface designs, a development platform has been built to support the PCID within knowledge-based engineering (KBE). An example is presented, indicating that the prototype system is maneuverable and practical.

  9. Collaborative Filtering Algorithms Based on Kendall Correlation in Recommender Systems

    Institute of Scientific and Technical Information of China (English)

    YAO Yu; ZHU Shanfeng; CHEN Xinmeng

    2006-01-01

    In this work, Kendall correlation based collaborative filtering algorithms for the recommender systems are proposed. The Kendall correlation method is used to measure the correlation amongst users by means of considering the relative order of the users' ratings. Kendall based algorithm is based upon a more general model and thus could be more widely applied in e-commerce. Another discovery of this work is that the consideration of only positive correlated neighbors in prediction, in both Pearson and Kendall algorithms, achieves higher accuracy than the consideration of all neighbors, with only a small loss of coverage.

  10. Toward Collaborative Evidence Based Information Practices: Organisation and Leadership Essentials

    Directory of Open Access Journals (Sweden)

    Anita Mirijamdotter

    2010-03-01

    Full Text Available This commentary is based on my keynote address for the EBLIP conference held in 2009 in Stockholm, Sweden. The title was: Bridging the gap between users and systems – the potential contribution of Social Informatics to Evidence Based Library and Information Practice. In the following commentary, I focus on the application of social informatics principles to develop a collaborative evidence based approach grounded in shared workplace leadership. My remarks highlight some main contributions from the field of library and information science and social informatics and conclude with implications for practice, including further research.

  11. THE DETECTION RATE OF EARLY UV EMISSION FROM SUPERNOVAE: A DEDICATED GALEX/PTF SURVEY AND CALIBRATED THEORETICAL ESTIMATES

    Energy Technology Data Exchange (ETDEWEB)

    Ganot, Noam; Gal-Yam, Avishay; Ofek, Eran O.; Sagiv, Ilan; Waxman, Eli; Lapid, Ofer [Department of Particle Physics and Astrophysics, Faculty of Physics, The Weizmann Institute of Science, Rehovot 76100 (Israel); Kulkarni, Shrinivas R.; Kasliwal, Mansi M. [Cahill Center for Astrophysics, California Institute of Technology, Pasadena, CA 91125 (United States); Ben-Ami, Sagi [Smithsonian Astrophysical Observatory, Harvard-Smithsonian Ctr. for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Chelouche, Doron; Rafter, Stephen [Physics Department, Faculty of Natural Sciences, University of Haifa, 31905 Haifa (Israel); Behar, Ehud; Laor, Ari [Physics Department, Technion Israel Institute of Technology, 32000 Haifa (Israel); Poznanski, Dovi; Nakar, Ehud; Maoz, Dan [School of Physics and Astronomy, Tel Aviv University, 69978 Tel Aviv (Israel); Trakhtenbrot, Benny [Institute for Astronomy, ETH Zurich, Wolfgang-Pauli-Strasse 27 Zurich 8093 (Switzerland); Neill, James D.; Barlow, Thomas A.; Martin, Christofer D., E-mail: noam.ganot@gmail.com [California Institute of Technology, 1200 East California Boulevard, MC 278-17, Pasadena, CA 91125 (United States); Collaboration: ULTRASAT Science Team; WTTH consortium; GALEX Science Team; Palomar Transient Factory; and others

    2016-03-20

    The radius and surface composition of an exploding massive star, as well as the explosion energy per unit mass, can be measured using early UV observations of core-collapse supernovae (SNe). We present the first results from a simultaneous GALEX/PTF search for early ultraviolet (UV) emission from SNe. Six SNe II and one Type II superluminous SN (SLSN-II) are clearly detected in the GALEX near-UV (NUV) data. We compare our detection rate with theoretical estimates based on early, shock-cooling UV light curves calculated from models that fit existing Swift and GALEX observations well, combined with volumetric SN rates. We find that our observations are in good agreement with calculated rates assuming that red supergiants (RSGs) explode with fiducial radii of 500 R{sub ⊙}, explosion energies of 10{sup 51} erg, and ejecta masses of 10 M{sub ⊙}. Exploding blue supergiants and Wolf–Rayet stars are poorly constrained. We describe how such observations can be used to derive the progenitor radius, surface composition, and explosion energy per unit mass of such SN events, and we demonstrate why UV observations are critical for such measurements. We use the fiducial RSG parameters to estimate the detection rate of SNe during the shock-cooling phase (<1 day after explosion) for several ground-based surveys (PTF, ZTF, and LSST). We show that the proposed wide-field UV explorer ULTRASAT mission is expected to find >85 SNe per year (∼0.5 SN per deg{sup 2}), independent of host galaxy extinction, down to an NUV detection limit of 21.5 mag AB. Our pilot GALEX/PTF project thus convincingly demonstrates that a dedicated, systematic SN survey at the NUV band is a compelling method to study how massive stars end their life.

  12. Image Recommendation Algorithm Using Feature-Based Collaborative Filtering

    Science.gov (United States)

    Kim, Deok-Hwan

    As the multimedia contents market continues its rapid expansion, the amount of image contents used in mobile phone services, digital libraries, and catalog service is increasing remarkably. In spite of this rapid growth, users experience high levels of frustration when searching for the desired image. Even though new images are profitable to the service providers, traditional collaborative filtering methods cannot recommend them. To solve this problem, in this paper, we propose feature-based collaborative filtering (FBCF) method to reflect the user's most recent preference by representing his purchase sequence in the visual feature space. The proposed approach represents the images that have been purchased in the past as the feature clusters in the multi-dimensional feature space and then selects neighbors by using an inter-cluster distance function between their feature clusters. Various experiments using real image data demonstrate that the proposed approach provides a higher quality recommendation and better performance than do typical collaborative filtering and content-based filtering techniques.

  13. Self-organized Collaboration Network Model Based on Module Emerging

    Science.gov (United States)

    Yang, Hongyong; Lu, Lan; Liu, Qiming

    Recently, the studies of the complex network have gone deep into many scientific fields, such as computer science, physics, mathematics, sociology, etc. These researches enrich the realization for complex network, and increase understands for the new characteristic of complex network. Based on the evolvement characteristic of the author collaboration in the scientific thesis, a self-organized network model of the scientific cooperation network is presented by module emerging. By applying the theoretical analysis, it is shown that this network model is a scale-free network, and the strength degree distribution and the module degree distribution of the network nodes have the same power law. In order to make sure the validity of the theoretical analysis for the network model, we create the computer simulation and demonstration collaboration network. By analyzing the data of the network, the results of the demonstration network and the computer simulation are consistent with that of the theoretical analysis of the model.

  14. Collaborative CPD and inquiry-based science in the classroom

    DEFF Research Database (Denmark)

    Nielsen, Birgitte Lund

    on the teaching of science and on collaboration. Qualitative data obtained by following the same teacher teaching Science & Technology from 4th to 6th grade are used to discuss changes in her classroom practice; in particular concerning inquiry-based methods shown in earlier QUEST-research to be understood...... between seminars, individual trials in own classroom, and collaborative activities in the science-team at local schools. The QUEST research is aimed at understanding the relation between individual and social changes. In this study, quantitative data are used to compare the perceived effect from QUEST...... as merely hands-on activities. In-depth understanding from the case contributed to further understand the quantitative results. Findings reveal a moderate positive correlation between teachers’ reports about changing classroom practice as a consequence of participating in QUEST, and their reports about...

  15. Collaborative CPD and inquiry-based science in the classroom

    DEFF Research Database (Denmark)

    Nielsen, Birgitte Lund

    2015-01-01

    on the teaching of science and on collaboration. Qualitative data obtained by following the same teacher teaching Science & Technology from 4th to 6th grade are used to discuss changes in her classroom practice; in particular concerning inquiry-based methods shown in earlier QUEST-research to be understood...... between seminars, individual trials in own classroom, and collaborative activities in the science-team at local schools. The QUEST research is aimed at understanding the relation between individual and social changes. In this study, quantitative data are used to compare the perceived effect from QUEST...... as merely hands-on activities. In-depth understanding from the case contributed to further understand the quantitative results. Findings reveal a moderate positive correlation between teachers’ reports about changing classroom practice as a consequence of participating in QUEST, and their reports about...

  16. Collaborative CPD and inquiry-based science in the classroom

    DEFF Research Database (Denmark)

    Nielsen, Birgitte Lund

    2015-01-01

    on the teaching of science and on collaboration. Qualitative data obtained by following the same teacher teaching Science & Technology from 4th to 6th grade are used to discuss changes in her classroom practice; in particular concerning inquiry-based methods shown in earlier QUEST-research to be understood...... between seminars, individual trials in own classroom, and collaborative activities in the science-team at local schools. The QUEST research is aimed at understanding the relation between individual and social changes. In this study, quantitative data are used to compare the perceived effect from QUEST...... as merely hands-on activities. In-depth understanding from the case contributed to further understand the quantitative results. Findings reveal a moderate positive correlation between teachers’ reports about changing classroom practice as a consequence of participating in QUEST, and their reports about...

  17. AGENT based structural static and dynamic collaborative optimization

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    A static and dynamic collaborative optimization mode for complex machine system and itsontology project relationship are put forward, on which an agent-based structural static and dynamiccollaborative optimization system is constructed as two agent colonies: optimization agent colony andfinite element analysis colony. And a two-level solving strategy as well as the necessity and possibilityfor handing with finite element analysis model in multi-level mode is discussed. Furthermore, the coop-eration of all FEA agents for optimal design of complicated structural is studied in detail. Structural stat-ic and dynamic collaborative optimization of hydraulic excavator working equimpent is taken as an ex-ample to show that the system is reliable.

  18. Multi-Task Collaboration CPS Modeling Based on Immune Feedback

    Directory of Open Access Journals (Sweden)

    Haiying Li

    2013-09-01

    Full Text Available In this paper, a dynamic multi-task collaboration CPS control model based on the self-adaptive immune feedback is proposed and implemented in the smart home environment. First, the internal relations between CPS and the biological immune system are explored via their basic theories. Second, CPS control mechanism is elaborated through the analysis of CPS control structure. Finally, a comprehensive strategy for support is introduced into multi-task collaboration to improve the dynamic cognitive ability. At the same time, the performance of parameters is correspondingly increased by the operator of the antibody concentration and the selective pressure. Furthermore, the model has been put into service in the smart home laboratory. The experimental results show that this model can integrate user’s needs into the environment for properly regulating the home environment.

  19. Improved Collaborative Filtering Recommendation Based on Classification and User Trust

    Institute of Scientific and Technical Information of China (English)

    Xiao-Lin Xu; Guang-Lin Xu

    2016-01-01

    When dealing with the ratings from users, traditional collaborative filtering algorithms do not consider the credibility of rating data, which affects the accuracy of similarity. To address this issue, the paper proposes an improved algorithm based on classification and user trust. It firstly classifies all the ratings by the categories of items. And then, for each category, it evaluates the trustworthy degree of each user on the category and imposes the degree on the ratings of the user. Finally, the algorithm explores the similarities between users, finds the nearest neighbors, and makes recommendations within each category. Simulations show that the improved algorithm outperforms the traditional collaborative filtering algorithms and enhances the accuracy of recommendation.

  20. An integrative approach to diagram-based collaborative brainstorming

    NARCIS (Netherlands)

    Azevedo, D.; Janeiro Lopes Da Silva, J.; Lukosch, S.G.; Briggs, R.O.; Fonseca, B.

    2011-01-01

    The need for computer supported collaboration has grown over the last years and made collaboration processes an important factor within organizations. This trend has resulted in the development of a variety of tools and technologies to support the various forms of collaboration. Many collaborative p

  1. A Collaborative Neighbor Representation Based Face Recognition Algorithm

    Directory of Open Access Journals (Sweden)

    Zhengming Li

    2013-01-01

    Full Text Available We propose a new collaborative neighbor representation algorithm for face recognition based on a revised regularized reconstruction error (RRRE, called the two-phase collaborative neighbor representation algorithm (TCNR. Specifically, the RRRE is the division of  l2-norm of reconstruction error of each class into a linear combination of  l2-norm of reconstruction coefficients of each class, which can be used to increase the discrimination information for classification. The algorithm is as follows: in the first phase, the test sample is represented as a linear combination of all the training samples by incorporating the neighbor information into the objective function. In the second phase, we use the k classes to represent the test sample and calculate the collaborative neighbor representation coefficients. TCNR not only can preserve locality and similarity information of sparse coding but also can eliminate the side effect on the classification decision of the class that is far from the test sample. Moreover, the rationale and alternative scheme of TCNR are given. The experimental results show that TCNR algorithm achieves better performance than seven previous algorithms.

  2. Designing Collaborative Learning Environments Using Educational Scenarios Based on SR

    Directory of Open Access Journals (Sweden)

    Fotini Paraskeva

    2009-01-01

    Full Text Available As more and more studies acknowledge that students are basic contributors to the learning process, factors such as self concept, (computer self-efficacy and self-regulation are important in enhancing human performance. Nevertheless, these learner characteristics have received little attention in the e-learning environment. This paper presents the results of a study indicating significant positive relationships between learner characteristics, such as self-concept (academic achievement and job achievement, Computer Self Efficacy (CSE and Self-Regulation (SR constructs. Acknowledging the requirement for a strong shift of students towards developing self-regulated scenarios and strategies, we suggest that collaborative e-learning environments should be designed according to the self-regulated theory and self-beliefs. As a result, in this study we present a model examining how we can design educational scenarios based on self-regulation theory in a collaborative e-learning environment. This model is a tool for conducting experiments in e-learning university courses, studying the design, development and evaluation of the collaborative learning process.

  3. Robust Collaborative Optimization Method Based on Dual-response Surface

    Institute of Scientific and Technical Information of China (English)

    WANG Wei; FAN Wenhui; CHANG Tianqing; YUAN Yuming

    2009-01-01

    A novel method for robust collaborative design of complex products based on dual-response surface (DRS-RCO) is proposed to solve multidisciplinary design optimization (MDO) problems under uncertainty. Collaborative optimization (CO) which decomposes the whole system into a double-level nonlinear optimization problem is widely Accepted as an efficient method to solve MDO problems. In order to improve the quality of complex product in design process, robust collaborative optimization (RCO) is developed to solve those problems under uncertain conditions. RCO does opfmiTation on the linear sum of mean and standard deviation of objective function and gets an optimal solution with high robustnmess. Response surfaces method is an important way to do approximation in robust design. DRS-RCO is an improved RCO method in which dual-response surface replaces system uncertainty analysis module of CO. The dual-response surface is the approximate model of mean and standard deviation of objective function respectively. In DRS-RCO, All the information of subsystems is included in dual-response surfaces. As an additional item, the standard deviation of objective function is added to the subsystem optimization. This item guarantee both the mean and standard deviation of this subsystem is reaching the minima at the same time. Finally, a test problem with two coupled subsystems is conducted to verify the feasibility and effectiveness of DRS-RCO.

  4. A Turkish newborn infant with cerebellar agenesis/neonatal diabetes mellitus and PTF1A mutation.

    Science.gov (United States)

    Tutak, E; Satar, M; Yapicioğlu, H; Altintaş, A; Narli, N; Hergüner, O; Bayram, Y

    2009-01-01

    Classical neonatal diabetes mellitus is defined as hyperglycemia that occurs within the first month of life in term infants. It can be either permanent or transient. Cerebellar agenesis and permanent neonatal diabetes has been previously reported as a new autosomal recessive disorder. Pancreas Transcription Factor 1 Alpha (PTF1A) mutations have been related with this constellation of abnormalities. Here we report a new case of cerebellar agenesis and neonatal diabetes mellitus whose parents are PTF1A mutation carriers.

  5. Applying Adaptive Swarm Intelligence Technology with Structuration in Web-Based Collaborative Learning

    Science.gov (United States)

    Huang, Yueh-Min; Liu, Chien-Hung

    2009-01-01

    One of the key challenges in the promotion of web-based learning is the development of effective collaborative learning environments. We posit that the structuration process strongly influences the effectiveness of technology used in web-based collaborative learning activities. In this paper, we propose an ant swarm collaborative learning (ASCL)…

  6. Using Wikis as a Support and Assessment Tool in Collaborative Digital Game-Based Learning Environments

    Science.gov (United States)

    Samur, Yavuz

    2011-01-01

    In computer-supported collaborative learning (CSCL) environments, there are many researches done on collaborative learning activities; however, in game-based learning environments, more research and literature on collaborative learning activities are required. Actually, both game-based learning environments and wikis enable us to use new chances…

  7. A scenario-based verification technique to assess the compatibility of collaborative business processes

    NARCIS (Netherlands)

    De Backer, M.; Snoeck, M.; Monsieur, G.; Lemahieu, W.; Dedene, G.

    2009-01-01

    Successful E-Business is based on seamless collaborative business processes. Each partner in the collaboration specifies its own rules and interaction preconditions. The verification of the compatibility of collaborative business processes, based on local and global views, is a complex task, which i

  8. Collaborative Simulation Run-time Management Environment Based on HLA

    Institute of Scientific and Technical Information of China (English)

    王江云; 柴旭东; 王行仁

    2002-01-01

    The Collaborative Simulation Run-time Management Environment based on HLA (CSRME) mainly focuses on simulation problems for the system design of the complex distributed simulation. CSRME can integrate all the simulation tools and simulation applications that comply with the well-documented interface standards defined by CSRME. CSRME supports both the interoperability of different simulations and the integration of simulation tools, as well as provides simulation run-time management, simulation time management and simulation data management. Finally, the distributed command training system is analyzed and realized to validate the theories of CSRME.

  9. Game-based Research Collaboration adapted to Science Education

    DEFF Research Database (Denmark)

    Magnussen, Rikke; Damgaard Hansen, Sidse; Grønbæk, Kaj

    2012-01-01

    This paper presents prospects for adapting scientific discovery games to science education. In the paper a prototype of The Quantum Computing Game is presented as a working example of adapting game-based research collaboration to physics education. The game concept is the initial result of a thre...... on a discussion of the concrete development of the Quantum Computing Game, the aim of this paper is to open a broader discussion of the potentials and implications of developing this class of games for new types of innovative science education....

  10. Multi-telerobot collaboration based on coordinated controller

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    A coordinated controller used for multi-telerobots collaboration was presented based on the strategy of shared control. First, it can overcome the effect of time delay. And, it combines the intelligence of the master side and the slave side, which cannot only increase the efficiency and the safety of the system but also relieve the burden and requirements of the operator. The controller can also cope with the collision between two telerobots. A simulation experiment was carried out to verify the validity of the controller for two slave robots.

  11. Performance-based competencies for culturally responsive interprofessional collaborative practice.

    Science.gov (United States)

    Banfield, Valerie; Lackie, Kelly

    2009-11-01

    This paper will highlight how a literature review and stakeholder-expert feedback guided the creation of an interprofessional facilitator-collaborator competency tool, which was then used to design an interprofessional facilitator development program for the Partners for Interprofessional Cancer Education (PICE) Project. Cancer Care Nova Scotia (CCNS), one of the PICE Project partners, uses an Interprofessional Core Curriculum (ICC) to provide continuing education workshops to community-based practitioners, who as a portion of their practice, care for patients experiencing cancer. In order to deliver this curriculum, health professionals from a variety of disciplines required education that would enable them to become culturally sensitive interprofessional educators in promoting collaborative patient-centred practice. The Registered Nurses Professional Development Centre (RN-PDC), another PICE Project partner, has expertise in performance-based certification program design and utilizes a competency-based methodology in its education framework. This framework and methodology was used to develop the necessary interprofessional facilitator competencies that incorporate the knowledge, skills, and attitudes required for performance. Three main competency areas evolved, each with its own set of competencies, performance criteria and behavioural indicators.

  12. Automated Dimension Determination for NMF-based Incremental Collaborative Filtering

    Directory of Open Access Journals (Sweden)

    Xiwei Wang

    2015-12-01

    Full Text Available The nonnegative matrix factorization (NMF based collaborative filtering t e chniques h a ve a c hieved great success in product recommendations. It is well known that in NMF, the dimensions of the factor matrices have to be determined in advance. Moreover, data is growing fast; thus in some cases, the dimensions need to be changed to reduce the approximation error. The recommender systems should be capable of updating new data in a timely manner without sacrificing the prediction accuracy. In this paper, we propose an NMF based data update approach with automated dimension determination for collaborative filtering purposes. The approach can determine the dimensions of the factor matrices and update them automatically. It exploits the nearest neighborhood based clustering algorithm to cluster users and items according to their auxiliary information, and uses the clusters as the constraints in NMF. The dimensions of the factor matrices are associated with the cluster quantities. When new data becomes available, the incremental clustering algorithm determines whether to increase the number of clusters or merge the existing clusters. Experiments on three different datasets (MovieLens, Sushi, and LibimSeTi were conducted to examine the proposed approach. The results show that our approach can update the data quickly and provide encouraging prediction accuracy.

  13. Collaborative Tracking of Image Features Based on Projective Invariance

    Science.gov (United States)

    Jiang, Jinwei

    In past manned lunar landing missions, such as Apollo 14, spatial disorientation of astronauts substantially compromised the productivities of astronauts, and caused safety and mission success problems. The non-GPS lunar environment has micro-gravity field, and lacks both spatial recognition cues and reference objects which are familiar to the human biological sensors related to spatial recognition (e.g. eyes). Such an environment causes misperceptions of the locations of astronauts and targets and their spatial relations, as well as misperceptions of the heading direction and travel distances of astronauts. These spatial disorientation effects can reduce productivity and cause life risks in lunar manned missions. A navigation system, which is capable of locating astronauts and tracking the movements of them on the lunar surface, is critical for future lunar manned missions where multiple astronauts will traverse more than 100km from the lander or the base station with the assistance from roving vehicle, and need real-time navigation support for effective collaborations among them. Our earlier research to solve these problems dealt with developing techniques to enable a precise, flexible and reliable Lunar Astronaut Spatial Orientation and Information System (LASOIS) capable of delivering real-time navigation information to astronauts on the lunar surface. The LASOIS hardware was a sensor network composed of orbital, ground and on-suit sensors: the Lunar Reconnaissance Orbiter Camera (LROC), radio beacons, the on-suit cameras, and shoe-mounted Inertial Measurement Unit (IMU). The LASOIS software included efficient and robust algorithms for estimating trajectory from IMU signals, generating heading information from imagery acquired from on-suit cameras, and an Extended Kalman Filter (EKF) based approach for integrating these spatial information components to generate the trajectory of an astronaut with meter-level accuracy. Moreover, LASOIS emphasized multi

  14. Security in Collaborative Multimedia Web-based Art Projects

    Directory of Open Access Journals (Sweden)

    Dimitrios K. Koukopoulos

    2010-10-01

    Full Text Available We propose a web-based system for organizing the creation and the interaction in multimedia web-based environments that permit the collaboration among artists, audience, curators and publishers. This system uses a threelevel approach for handling security issues in multimedia projects. Especially, it applies authorization, digital certification and watermarking mechanisms on multimedia content. Authorization mechanism controls users operations in multimedia files based on a set of actions imposed on reallife scenarios. Digital certification mechanism ensures the secure content transfers among users and multimedia content server through Web. Digital watermarking mechanism handles copyright-protection and authentication issues that appear in multimedia systems applying a semantically secure watermark. The strength of our system considers multimedia content not as an atomic digital entity, but as a part of a project with a specific workflow that applies watermarking techniques in all its parts.

  15. Collaborative Product Configuration Model in Networked Manufacturing Based on Semantic Web%投稿须知

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    Aim at the requirements of collaborative product configuration design in networked manufacturing, a collaborative product configuration model based on semantic web was exploredA semantic web-based structure of the collaborative product configuration model was proposedAnd a product configuration design workflow model was constructedThe collaborative product configuration ontology was constructed by definition of semantic-based metadata of collaborative product configuration information. The ontology was used for semantic annotation of information that dispersed in the network.So the product configuration information can shared between collaborative enterprises in networked manufacturing.And the efficiency of distribute information exchange and the collaborative product development level can be improved,The validity of the model was verified by applying the model into a networked collaborative design platform.

  16. Correlation Study of PtfV1 with Heart-Qi Deficiency Syndrome in Patients with Hypertensive Left Ventricular Hypertrophy

    Institute of Scientific and Technical Information of China (English)

    杨传华; 陆峰

    2002-01-01

    @@ It is generally believed that the change of p-wave terminal force in lead V1 (PtfV1) is associated with the inner diameter of left atrium, left ventricular compliance,and ventricular diastolic function. The increase of negative value of PtfV1 in essential hypertensive (EH) patients with left ventricular hypertrophy (LVH) indicates the cardiac function may be damaged. In order to explore the relationship between Heart-Qi Deficiency Syndrome (HQDS) of TCM and PtfV1 level in hypertensive LVH patients, correlation analysis of scores of Heart-Qi Deficiency Syndrome and negative value of PtfV1 was made by the authors.

  17. DISCOVERY AND REDSHIFT OF AN OPTICAL AFTERGLOW IN 71 deg{sup 2}: iPTF13bxl AND GRB 130702A

    Energy Technology Data Exchange (ETDEWEB)

    Singer, Leo P.; Brown, Duncan A. [LIGO Laboratory, California Institute of Technology, Pasadena, CA 91125 (United States); Bradley Cenko, S.; Gehrels, Neil; McEnery, Julie [Astrophysics Science Division, NASA Goddard Space Flight Center, Mail Code 661, Greenbelt, MD 20771 (United States); Kasliwal, Mansi M.; Mulchaey, John [Observatories of the Carnegie Institution for Science, 813 Santa Barbara St, Pasadena, CA 91101 (United States); Perley, Daniel A.; Kulkarni, S. R.; Bellm, Eric; Barlow, Tom; Cao, Yi; Horesh, Assaf [Cahill Center for Astrophysics, California Institute of Technology, Pasadena, CA 91125 (United States); Ofek, Eran O.; Arcavi, Iair [Benoziyo Center for Astrophysics, The Weizmann Institute of Science, Rehovot 76100 (Israel); Nugent, Peter E.; Bloom, Joshua S. [Department of Astronomy, University of California Berkeley, B-20 Hearst Field Annex 3411, Berkeley, CA 94720-3411 (United States); Corsi, Alessandra [George Washington University, Corcoran Hall, Washington, DC 20052 (United States); Frail, Dale A. [National Radio Astronomy Observatory, P.O. Box O, Socorro, NM 87801 (United States); Masci, Frank J., E-mail: lsinger@caltech.edu [Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125 (United States); and others

    2013-10-20

    We report the discovery of the optical afterglow of the γ-ray burst (GRB) 130702A, identified upon searching 71 deg{sup 2} surrounding the Fermi Gamma-ray Burst Monitor (GBM) localization. Discovered and characterized by the intermediate Palomar Transient Factory, iPTF13bxl is the first afterglow discovered solely based on a GBM localization. Real-time image subtraction, machine learning, human vetting, and rapid response multi-wavelength follow-up enabled us to quickly narrow a list of 27,004 optical transient candidates to a single afterglow-like source. Detection of a new, fading X-ray source by Swift and a radio counterpart by CARMA and the Very Large Array confirmed the association between iPTF13bxl and GRB 130702A. Spectroscopy with the Magellan and Palomar 200 inch telescopes showed the afterglow to be at a redshift of z = 0.145, placing GRB 130702A among the lowest redshift GRBs detected to date. The prompt γ-ray energy release and afterglow luminosity are intermediate between typical cosmological GRBs and nearby sub-luminous events such as GRB 980425 and GRB 060218. The bright afterglow and emerging supernova offer an opportunity for extensive panchromatic follow-up. Our discovery of iPTF13bxl demonstrates the first observational proof-of-principle for ∼10 Fermi-iPTF localizations annually. Furthermore, it represents an important step toward overcoming the challenges inherent in uncovering faint optical counterparts to comparably localized gravitational wave events in the Advanced LIGO and Virgo era.

  18. Protection of Location Privacy Based on Distributed Collaborative Recommendations

    Science.gov (United States)

    Wang, Peng; Yang, Jing; Zhang, Jian-Pei

    2016-01-01

    In the existing centralized location services system structure, the server is easily attracted and be the communication bottleneck. It caused the disclosure of users’ location. For this, we presented a new distributed collaborative recommendation strategy that is based on the distributed system. In this strategy, each node establishes profiles of their own location information. When requests for location services appear, the user can obtain the corresponding location services according to the recommendation of the neighboring users’ location information profiles. If no suitable recommended location service results are obtained, then the user can send a service request to the server according to the construction of a k-anonymous data set with a centroid position of the neighbors. In this strategy, we designed a new model of distributed collaborative recommendation location service based on the users’ location information profiles and used generalization and encryption to ensure the safety of the user’s location information privacy. Finally, we used the real location data set to make theoretical and experimental analysis. And the results show that the strategy proposed in this paper is capable of reducing the frequency of access to the location server, providing better location services and protecting better the user’s location privacy. PMID:27649308

  19. Integrating collaborative concept mapping in case based learning

    Directory of Open Access Journals (Sweden)

    Alfredo Tifi

    2013-03-01

    Full Text Available Different significance of collaborative concept mapping and collaborative argumentation in Case Based Learning are discussed and compared in the different perspectives of answering focus questions, of fostering reflective thinking skills and in managing uncertainty in problem solving in a scaffolded environment. Marked differences are pointed out between the way concepts are used in constructing concept maps and the way meanings are adopted in case based learning through guided argumentation activities. Shared concept maps should be given different scopes, as for example a as an advance organizer in preparing a background system of concepts that will undergo transformation while accompanying the inquiry activities on case studies or problems; b together with narratives, to enhance awareness of the situated epistemologies that are being entailed in choosing certain concepts during more complex case studies, and c after-learning construction of a holistic vision of the whole domain by means of the most inclusive concepts, while scaffoldedcollaborative writing of narratives and arguments in describing-treating cases could better serve as a source of situated-inspired tools to create-refine meanings for particular concepts.

  20. Protection of Location Privacy Based on Distributed Collaborative Recommendations.

    Science.gov (United States)

    Wang, Peng; Yang, Jing; Zhang, Jian-Pei

    2016-01-01

    In the existing centralized location services system structure, the server is easily attracted and be the communication bottleneck. It caused the disclosure of users' location. For this, we presented a new distributed collaborative recommendation strategy that is based on the distributed system. In this strategy, each node establishes profiles of their own location information. When requests for location services appear, the user can obtain the corresponding location services according to the recommendation of the neighboring users' location information profiles. If no suitable recommended location service results are obtained, then the user can send a service request to the server according to the construction of a k-anonymous data set with a centroid position of the neighbors. In this strategy, we designed a new model of distributed collaborative recommendation location service based on the users' location information profiles and used generalization and encryption to ensure the safety of the user's location information privacy. Finally, we used the real location data set to make theoretical and experimental analysis. And the results show that the strategy proposed in this paper is capable of reducing the frequency of access to the location server, providing better location services and protecting better the user's location privacy.

  1. Web-based Collaboration and Visualization in the ANDRILL Program

    Science.gov (United States)

    Reed, J.; Rack, F. R.; Huffman, L. T.; Cattadori, M.

    2009-12-01

    ANDRILL has embraced the web as a platform for facilitating collaboration and communicating science with educators, students and researchers alike. Two recent ANDRILL education and outreach projects, Project Circle 2008 and the Climate Change Student Summit, brought together classrooms from around the world to participate in cutting edge science. A large component of each project was the online collaboration achieved through project websites, blogs, and the GroupHub--a secure online environment where students could meet to send messages, exchange presentations and pictures, and even chat live. These technologies enabled students from different countries and time zones to connect and participate in a shared 'conversation' about climate change research. ANDRILL has also developed several interactive, web-based visualizations to make scientific drilling data more engaging and accessible to the science community and the public. Each visualization is designed around three core concepts that enable the Web 2.0 platform, namely, that they are: (1) customizable - a user can customize the visualization to display the exact data she is interested in; (2) linkable - each view in the visualization has a distinct URL that the user can share with her friends via sites like Facebook and Twitter; and (3) mashable - the user can take the visualization, mash it up with data from other sites or her own research, and embed it in her blog or website. The web offers an ideal environment for visualization and collaboration because it requires no special software and works across all computer platforms, which allows organizations and research projects to engage much larger audiences. In this presentation we will describe past challenges and successes, as well as future plans.

  2. Collaboration, negotiation, and coalescence for interagency-collaborative teams to scale-up evidence-based practice.

    Science.gov (United States)

    Aarons, Gregory A; Fettes, Danielle L; Hurlburt, Michael S; Palinkas, Lawrence A; Gunderson, Lara; Willging, Cathleen E; Chaffin, Mark J

    2014-01-01

    Implementation and scale-up of evidence-based practices (EBPs) is often portrayed as involving multiple stakeholders collaborating harmoniously in the service of a shared vision. In practice, however, collaboration is a more complex process that may involve shared and competing interests and agendas, and negotiation. The present study examined the scale-up of an EBP across an entire service system using the Interagency Collaborative Team approach. Participants were key stakeholders in a large-scale county-wide implementation of an EBP to reduce child neglect, SafeCare. Semistructured interviews and/or focus groups were conducted with 54 individuals representing diverse constituents in the service system, followed by an iterative approach to coding and analysis of transcripts. The study was conceptualized using the Exploration, Preparation, Implementation, and Sustainment framework. Although community stakeholders eventually coalesced around implementation of SafeCare, several challenges affected the implementation process. These challenges included differing organizational cultures, strategies, and approaches to collaboration; competing priorities across levels of leadership; power struggles; and role ambiguity. Each of the factors identified influenced how stakeholders approached the EBP implementation process. System-wide scale-up of EBPs involves multiple stakeholders operating in a nexus of differing agendas, priorities, leadership styles, and negotiation strategies. The term collaboration may oversimplify the multifaceted nature of the scale-up process. Implementation efforts should openly acknowledge and consider this nexus when individual stakeholders and organizations enter into EBP implementation through collaborative processes.

  3. Web-Based Collaborative Publications System: R&Tserve

    Science.gov (United States)

    Abrams, Steve

    1997-01-01

    R&Tserve is a publications system based on 'commercial, off-the-shelf' (COTS) software that provides a persistent, collaborative workspace for authors and editors to support the entire publication development process from initial submission, through iterative editing in a hierarchical approval structure, and on to 'publication' on the WWW. It requires no specific knowledge of the WWW (beyond basic use) or HyperText Markup Language (HTML). Graphics and URLs are automatically supported. The system includes a transaction archive, a comments utility, help functionality, automated graphics conversion, automated table generation, and an email-based notification system. It may be configured and administered via the WWW and can support publications ranging from single page documents to multiple-volume 'tomes'.

  4. Game-based Research Collaboration adapted to Science Education

    DEFF Research Database (Denmark)

    Magnussen, Rikke; Damgaard Hansen, Sidse; Grønbæk, Kaj

    2012-01-01

    This paper presents prospects for adapting scientific discovery games to science education. In the paper a prototype of The Quantum Computing Game is presented as a working example of adapting game-based research collaboration to physics education. The game concept is the initial result of a three......-year, inter-disciplinary project “Pilot Center for Community-driven Research” at Aarhus and Aalborg University in Denmark. The paper discusses how scientific discovery games can contribute to educating students in how to work with unsolved scientific problems and creation of new scientific knowledge. Based...... on a discussion of the concrete development of the Quantum Computing Game, the aim of this paper is to open a broader discussion of the potentials and implications of developing this class of games for new types of innovative science education....

  5. Ontology-based collaborative framework for disaster recovery scenarios

    CERN Document Server

    Ramanathan, Sakkaravarthi; Drira, Khalil; Chassot, Christophe

    2012-01-01

    This paper aims at designing of adaptive framework for supporting collaborative work of different actors in public safety and disaster recovery missions. In such scenarios, firemen and robots interact to each other to reach a common goal; firemen team is equipped with smart devices and robots team is supplied with communication technologies, and should carry on specific tasks. Here, reliable connection is mandatory to ensure the interaction between actors. But wireless access network and communication resources are vulnerable in the event of a sudden unexpected change in the environment. Also, the continuous change in the mission requirements such as inclusion/exclusion of new actor, changing the actor's priority and the limitations of smart devices need to be monitored. To perform dynamically in such case, the presented framework is based on a generic multi-level modeling approach that ensures adaptation handled by semantic modeling. Automated self-configuration is driven by rule-based reconfiguration polici...

  6. Web-Based Tools for Collaborative Evaluation of Learning Resources

    Directory of Open Access Journals (Sweden)

    John C. Nesbit

    2005-10-01

    Full Text Available The emergence of large repositories of web-based learning resources has increased the need for valid and usable evaluation tools. This paper reviews current approaches to learning object evaluation and introduces eLera, a set of web-based tools we have developed for communities of teachers, learners, instructional designers and developers. Compatible with current metadata standards, eLera provides a learning object review instrument (LORI and other features supporting collaborative evaluation. eLera provides limited translation of evaluations and subject taxonomies across communities using different languages and terminology. eLera is designed to assist researchers to gather data on evaluation processes and has been used to teach educators how to assess the quality of multimedia learning resources.

  7. A Distributed Feature-based Environment for Collaborative Design

    Directory of Open Access Journals (Sweden)

    Wei-Dong Li

    2003-02-01

    Full Text Available This paper presents a client/server design environment based on 3D feature-based modelling and Java technologies to enable design information to be shared efficiently among members within a design team. In this environment, design tasks and clients are organised through working sessions generated and maintained by a collaborative server. The information from an individual design client during a design process is updated and broadcast to other clients in the same session through an event-driven and call-back mechanism. The downstream manufacturing analysis modules can be wrapped as agents and plugged into the open environment to support the design activities. At the server side, a feature-feature relationship is established and maintained to filter the varied information of a working part, so as to facilitate efficient information update during the design process.

  8. Distributed Collaborative Homework Activities in a Problem-Based Usability Engineering Course

    Science.gov (United States)

    Carroll, John M.; Jiang, Hao; Borge, Marcela

    2015-01-01

    Teams of students in an upper-division undergraduate Usability Engineering course used a collaborative environment to carry out a series of three distributed collaborative homework assignments. Assignments were case-based analyses structured using a jigsaw design; students were provided a collaborative software environment and introduced to a…

  9. Collaboration, Intragroup Conflict, and Social Skills in Project-Based Learning

    Science.gov (United States)

    Lee, Dabae; Huh, Yeol; Reigeluth, Charles M.

    2015-01-01

    This case study was conducted in two high school classrooms that utilized collaborative project-based learning (PBL). Collaboration is an important instructional strategy, especially used in conjunction with PBL, and is an essential learning outcome for the twenty-first century. This study examined how collaboration can be achieved as a learning…

  10. Students' Perceptions of Wiki-Based Collaborative Writing for Learners of English as a Foreign Language

    Science.gov (United States)

    Chao, Yu-Chuan Joni; Lo, Hao-Chang

    2011-01-01

    This study proposes a Wiki-based collaborative writing approach to the writing process for EFL (English as a foreign language) learners. A five-stage computer-mediated collaborative writing project including collaborative planning, partitioned drafting, peer-revising, peer-editing, and individual publishing was blended with on-campus English…

  11. Ptf1a triggers GABAergic neuronal cell fates in the retina

    Directory of Open Access Journals (Sweden)

    Parain Karine

    2007-10-01

    Full Text Available Abstract Background In recent years, considerable knowledge has been gained on the molecular mechanisms underlying retinal cell fate specification. However, hitherto studies focused primarily on the six major retinal cell classes (five types of neurons of one type of glial cell, and paid little attention to the specification of different neuronal subtypes within the same cell class. In particular, the molecular machinery governing the specification of the two most abundant neurotransmitter phenotypes in the retina, GABAergic and glutamatergic, is largely unknown. In the spinal cord and cerebellum, the transcription factor Ptf1a is essential for GABAergic neuron production. In the mouse retina, Ptf1a has been shown to be involved in horizontal and most amacrine neurons differentiation. Results In this study, we examined the distribution of neurotransmitter subtypes following Ptf1a gain and loss of function in the Xenopus retina. We found cell-autonomous dramatic switches between GABAergic and glutamatergic neuron production, concomitant with profound defects in the genesis of amacrine and horizontal cells, which are mainly GABAergic. Therefore, we investigated whether Ptf1a promotes the fate of these two cell types or acts directly as a GABAergic subtype determination factor. In ectodermal explant assays, Ptf1a was found to be a potent inducer of the GABAergic subtype. Moreover, clonal analysis in the retina revealed that Ptf1a overexpression leads to an increased ratio of GABAergic subtypes among the whole amacrine and horizontal cell population, highlighting its instructive capacity to promote this specific subtype of inhibitory neurons. Finally, we also found that within bipolar cells, which are typically glutamatergic interneurons, Ptf1a is able to trigger a GABAergic fate. Conclusion Altogether, our results reveal for the first time in the retina a major player in the GABAergic versus glutamatergic cell specification genetic pathway.

  12. Ambient Sound-Based Collaborative Localization of Indeterministic Devices

    Science.gov (United States)

    Kamminga, Jacob; Le, Duc; Havinga, Paul

    2016-01-01

    Localization is essential in wireless sensor networks. To our knowledge, no prior work has utilized low-cost devices for collaborative localization based on only ambient sound, without the support of local infrastructure. The reason may be the fact that most low-cost devices are indeterministic and suffer from uncertain input latencies. This uncertainty makes accurate localization challenging. Therefore, we present a collaborative localization algorithm (Cooperative Localization on Android with ambient Sound Sources (CLASS)) that simultaneously localizes the position of indeterministic devices and ambient sound sources without local infrastructure. The CLASS algorithm deals with the uncertainty by splitting the devices into subsets so that outliers can be removed from the time difference of arrival values and localization results. Since Android is indeterministic, we select Android devices to evaluate our approach. The algorithm is evaluated with an outdoor experiment and achieves a mean Root Mean Square Error (RMSE) of 2.18 m with a standard deviation of 0.22 m. Estimated directions towards the sound sources have a mean RMSE of 17.5° and a standard deviation of 2.3°. These results show that it is feasible to simultaneously achieve a relative positioning of both devices and sound sources with sufficient accuracy, even when using non-deterministic devices and platforms, such as Android. PMID:27649176

  13. Reflective pattern-based approach to collaborative media space management

    Science.gov (United States)

    Robbins, Wayne; Georganas, Nicolas D.

    1998-12-01

    The role of traditional multimedia systems has been to disseminate information. The advent of media spaces, however, offers an increased potential in terms of presentation as well as facilitating a natural and intuitive environment for interpersonal communication. Combined with Computer Supported Cooperative Work technologies, these shared, media-rich environments offer a natural basis for distributed collaboration through a seamless blend of presentational, conversational and interactive multimedia. The resulting notion underlies the definition of a collaborative media space in which users interact with each other through the experience and manipulation of shared media. The integration of such a diverse array of entities presents many challenges, ranging from the need to support a variety of media types to managing how objects in such a system interact. Indeed, a primary consideration with such system is the coordination (including both causal and temporal synchronization) of entities within the space. This work addresses how to facilitate media space design by employing a pattern-based meta-level architecture and management infrastructure in which reflection is used to isolate system-level issues such as behavioral coordination from low-level, media-specific computation. The architectural framework and its underlying topology are illustrated along with the model's application to a distance education system.

  14. Project based, Collaborative, Algorithmic Robotics for High School Students: Programming Self Driving Race Cars at MIT

    Science.gov (United States)

    2017-02-19

    program is an excellent example of the utilization of state-of-the-art robotics equipment. It has also emphasized collaboration and teamwork since...Project-based, Collaborative , Algorithmic Robotics for High School Students: Programming Self-driving Race Cars at MIT Sertac Karaman...implemented in a collaborative fashion: the students learn the basics of collaboration and technical communication in lectures, and they work in teams to

  15. Informed Systems: Enabling Collaborative Evidence Based Organizational Learning

    Directory of Open Access Journals (Sweden)

    Mary M. Somerville

    2015-12-01

    Full Text Available Objective – In response to unrelenting disruptions in academic publishing and higher education ecosystems, the Informed Systems approach supports evidence based professional activities to make decisions and take actions. This conceptual paper presents two core models, Informed Systems Leadership Model and Collaborative Evidence-Based Information Process Model, whereby co-workers learn to make informed decisions by identifying the decisions to be made and the information required for those decisions. This is accomplished through collaborative design and iterative evaluation of workplace systems, relationships, and practices. Over time, increasingly effective and efficient structures and processes for using information to learn further organizational renewal and advance nimble responsiveness amidst dynamically changing circumstances. Methods – The integrated Informed Systems approach to fostering persistent workplace inquiry has its genesis in three theories that together activate and enable robust information usage and organizational learning. The information- and learning-intensive theories of Peter Checkland in England, which advance systems design, stimulate participants’ appreciation during the design process of the potential for using information to learn. Within a co-designed environment, intentional social practices continue workplace learning, described by Christine Bruce in Australia as informed learning enacted through information experiences. In addition, in Japan, Ikujiro Nonaka’s theories foster information exchange processes and knowledge creation activities within and across organizational units. In combination, these theories promote the kind of learning made possible through evolving and transferable capacity to use information to learn through design and usage of collaborative communication systems with associated professional practices. Informed Systems therein draws from three antecedent theories to create an original

  16. When Collaborative Learning Meets Nature: Collaborative Learning as a Meaningful Learning Tool in the Ecology Inquiry Based Project

    Science.gov (United States)

    Rozenszayn, Ronit; Ben-Zvi Assaraf, Orit

    2011-01-01

    This research suggests utilizing collaborative learning among high school students for better performance on ecology inquiry-based projects. A case study of nine 12th grade students who participated in collaborative learning sessions in the open field and in class is examined. The results show that the students concentrated on discussing the methods of measurement and observation in the open field, rather than the known methods from class or from the laboratory. Another major part of their discussions concentrated on knowledge construction. Knowledge construction occurred between students with same or similar learning abilities. The role of the teacher in these discussions was crucial: she had to deal with and dispel misconceptions; and she had to bridge the gap between low-ability and high-ability students, for enabling meaningful learning to occur. The article ends with a number of recommendations for using collaborative learning as a tool for achieving meaningful learning in high school ecology inquiry-based projects.

  17. The Rise and Fall of the Type Ib Supernova iPTF13bvn Not a Massive Wolf-Rayet Star

    Science.gov (United States)

    Fremling, C.; Sollerman, J.; Taddia, F.; Ergon, M.; Valenti, S.; Arcavi, I.; Ben-Ami, S.; Cao, Y.; Cenko, S. B.; Filippenko, A. V.; Gal-Yam, A.; Howell, D. A.

    2014-01-01

    Context. We investigate iPTF13bvn, a core-collapse (CC) supernova (SN) in the nearby spiral galaxy NGC 5806. This object was discovered by the intermediate Palomar Transient Factory (iPTF) very close to the estimated explosion date and was classified as a stripped-envelope CC SN, likely of Type Ib. Furthermore, a possible progenitor detection in pre-explosion Hubble Space Telescope (HST) images was reported, making this the only SN Ib with such an identification. Based on the luminosity and color of the progenitor candidate, as well as on early-time spectra and photometry of the SN, it was argued that the progenitor candidate is consistent with a single, massive Wolf-Rayet (WR) star. Aims. We aim to confirm the progenitor detection, to robustly classify the SN using additional spectroscopy, and to investigate if our follow-up photometric and spectroscopic data on iPTF13bvn are consistent with a single-star WR progenitor scenario. Methods. We present a large set of observational data, consisting of multi-band light curves (UBVRI, g'r'i'z') and optical spectra. We perform standard spectral line analysis to track the evolution of the SN ejecta. We also construct a bolometric light curve and perform hydrodynamical calculations to model this light curve to constrain the synthesized radioactive nickel mass and the total ejecta mass of the SN. Late-time photometry is analyzed to constrain the amount of oxygen. Furthermore, image registration of pre- and post-explosion HST images is performed. Results. Our HST astrometry confirms the location of the progenitor candidate of iPTF13bvn, and follow-up spectra securely classify this as a SN Ib. We use our hydrodynamical model to fit the observed bolometric light curve, estimating the total ejecta mass to be 1.9 solar mass and the radioactive nickel mass to be 0.05 solar mass. The model fit requires the nickel synthesized in the explosion to be highly mixed out in the ejecta. We also find that the late-time nebular r

  18. Framework for Supporting Web-Based Collaborative Applications

    Science.gov (United States)

    Dai, Wei

    The article proposes an intelligent framework for supporting Web-based applications. The framework focuses on innovative use of existing resources and technologies in the form of services and takes the leverage of theoretical foundation of services science and the research from services computing. The main focus of the framework is to deliver benefits to users with various roles such as service requesters, service providers, and business owners to maximize their productivity when engaging with each other via the Web. The article opens up with research motivations and questions, analyses the existing state of research in the field, and describes the approach in implementing the proposed framework. Finally, an e-health application is discussed to evaluate the effectiveness of the framework where participants such as general practitioners (GPs), patients, and health-care workers collaborate via the Web.

  19. Effects of community-based collaborative group characteristics on social capital.

    Science.gov (United States)

    Wagner, Cheryl L; Fernandez-Gimenez, Maria E

    2009-10-01

    Recent research suggests that community-based collaboration may build social capital-defined as trust, norms of reciprocity, and networks. Social capital may improve a group's ability to collaborate, manage risk, innovate, and adapt to change. We used mail surveys of group participants and key informant interviews to assess whether the following collaborative group characteristics affected social capital built within 10 collaborative groups in northwest Colorado: perceived success, conflict, activeness, stakeholder diversity, previous collaboration experience, similar values and beliefs, group size, group age, and initial social capital. Perceived success and initial levels of social capital were the strongest predictors of current levels of and changes in social capital over time. Collaboration experience negatively influenced current levels of trust. Our results suggest that collaborative groups may need to consider the outcomes of collaborative interactions in order to build social capital.

  20. PTF10fqs: A Luminous Red Nova in the Spiral Galaxy Messier 99

    CERN Document Server

    Kasliwal, Mansi M; Quimby, Robert M; Ofek, Eran O; Nugent, Peter; Jacobsen, Janet; Gal-Yam, Avishay; Green, Yoav; Arcavi, Iair; Yaron, Ofer; Howell, Jacob L; Fox, Derek B; Cenko, S Bradley; Kleiser, Io; Bloom, Joshua S; Miller, Adam; Poznanski, Dovi; Li, Weidong; Filippenko, Alexei V; Starr, Dan; Law, Nicholas M; Helou, George; Frail, Dale A; Neill, James D; Forster, Karl; Martin, D Christopher; Tendulkar, Shriharsh P; Gehrels, Neil; Kennea, Jamie; Sullivan, Mark; Dekany, Richard; Rahmer, Gustavo; Hale, David; Smith, Roger; Zolkower, Jeff; Velur, Viswa; Walters, Richard; Henning, John; Bui, Kahnh; McKenna, Dan; Blake, Cullen

    2010-01-01

    The Palomar Transient Factory (PTF) is systematically charting the optical transient and variable sky. A primary science driver of PTF is building a complete inventory of transients in the local Universe (distance less than 200 Mpc). Here, we report the discovery of PTF10fqs, a transient in the luminosity "gap" between novae and supernovae. Located in the spiral arm of Messier 99, PTF10fqs is red, slowly evolving and has a spectrum dominated by intermediate width Halpha and Calcium lines. The explosion signature is similar to M85OT2006-1, SN2008S and NGC300-OT. The origin of these events is shrouded in mystery, controversy (and in some cases, in dust). PTF10fqs shows some evidence of a broad feature (around 8600A) that may suggest very large velocities in this explosion (~10000 km/s). Ongoing surveys can be expected to find a few such events per year. Sensitive spectroscopy and statistics (disk versus bulge) will eventually make it possible for astronomers to unravel the nature of these mysterious explosions.

  1. The discovery of the multiply-imaged lensed Type Ia supernova iPTF16geu

    CERN Document Server

    Goobar, A; Kulkarni, S R; Nugent, P E; Johansson, J; Steidel, C; Law, D; Mortsell, E; Quimby, R; Blagorodnova, N; Brandeker, A; Cao, Y; Cooray, A; Ferretti, R; Fremling, C; Hangard, L; Kasliwal, M; Kupfer, T; Lunnan, R; Masci, F; Miller, A A; Nayyeri, H; Neill, J D; Ofek, E O; Papadogiannakis, S; Petrushevska, T; Ravi, V; Sollerman, J; Sullivan, M; Taddia, F; Walters, R; Wilson, D; Yan, L; Yaron, O

    2016-01-01

    We report the discovery of a gravitationally lensed Type Ia supernova (SN Ia) by the intermediate Palomar Transient Factor (iPTF). The light originating from SNIa iPTF16geu, at redshift $z_{SN}=0.409$, is magnified by an intervening galaxy at $z_{l}=0.216$, acting as a gravitational lens. Using Laser Guide Star Adaptive Optics (LGSAO) OSIRIS and NIRC2 observations at the Keck telescope, as well as measurements with the Hubble Space Telescope, we were able to detect the strong bending of the light path, both for iPTF16geu and its host galaxy. We detect four images of the supernova, approximately 0.3" from the center of the lensing galaxy. iPTF16geu is the first \\snia for which multiple images have been observed. From the fits of the multi-color lightcurve we derive a lensing magnification, $\\Delta m = 4.37 \\pm 0.15$ mag, corresponding to a total amplification of the supernova flux by a factor $\\mu \\sim 56$. The discovery of iPTF16geu suggests that lensing by sub-kpc structures may have been greatly underestima...

  2. A DOUBLE NEUTRON STAR MERGER ORIGIN FOR THE COSMOLOGICAL RELATIVISTIC FADING SOURCE PTF11agg?

    Energy Technology Data Exchange (ETDEWEB)

    Wu, Xue-Feng; Gao, He; Ding, Xuan [Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008 (China); Zhang, Bing [Department of Physics and Astronomy, University of Nevada Las Vegas, Las Vegas, NV 89154 (United States); Dai, Zi-Gao [School of Astronomy and Space Science, Nanjing University, Nanjing 210093 (China); Wei, Jian-Yan, E-mail: xfwu@pmo.ac.cn [National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China)

    2014-01-20

    The Palomar Transient Factory (PTF) team recently reported the discovery of a rapidly fading optical transient source, PTF11agg. A long-lived scintillating radio counterpart was identified, but the search for a high-energy counterpart showed negative results. The PTF team speculated that PTF11agg may represent a new class of relativistic outbursts. Here we suggest that a neutron star (NS)-NS merger system with a supra-massive magnetar central engine could be a possible source to power such a transient, if our line of sight is not on the jet axis direction of the system. These systems are also top candidates for gravitational wave sources to be detected in the advanced LIGO/Virgo era. We find that the PTF11agg data could be explained well with such a model, suggesting that at least some gravitational wave bursts due to NS-NS mergers may be associated with such a bright electromagnetic counterpart without a γ-ray trigger.

  3. Collaborative Virtual Organizations in Knowledge-based Economy

    Directory of Open Access Journals (Sweden)

    Ion IVAN

    2012-01-01

    Full Text Available The paper establishes the content of the virtual organizations concept, insisting on their collaborative nature. Types of virtual organizations architectures are developed and there are analyzed their characteristics compared to classical organizations existing in the pre-informational economy. There are presented virtual organizations for education, production and banking, focusing on their collaborative side. Metrics are built to evaluate the performance of collaborative virtual organizations.

  4. Multi-skill Collaborative Teams based on Densest Subgraphs

    OpenAIRE

    Gajewar, Amita; Sarma, Atish Das

    2011-01-01

    We consider the problem of identifying a team of skilled individuals for collaboration, in the presence of a social network. Each node in the social network may be an expert in one or more skills. Edge weights specify affinity or collaborative compatibility between respective nodes. Given a project that requires a set of specified number of skilled individuals in each area of expertise, the goal is to identify a team that maximizes the collaborative compatibility. For example, the requirement...

  5. Computer Based Collaborative Problem Solving for Introductory Courses in Physics

    Science.gov (United States)

    Ilie, Carolina; Lee, Kevin

    2010-03-01

    We discuss collaborative problem solving computer-based recitation style. The course is designed by Lee [1], and the idea was proposed before by Christian, Belloni and Titus [2,3]. The students find the problems on a web-page containing simulations (physlets) and they write the solutions on an accompanying worksheet after discussing it with a classmate. Physlets have the advantage of being much more like real-world problems than textbook problems. We also compare two protocols for web-based instruction using simulations in an introductory physics class [1]. The inquiry protocol allowed students to control input parameters while the worked example protocol did not. We will discuss which of the two methods is more efficient in relation to Scientific Discovery Learning and Cognitive Load Theory. 1. Lee, Kevin M., Nicoll, Gayle and Brooks, Dave W. (2004). ``A Comparison of Inquiry and Worked Example Web-Based Instruction Using Physlets'', Journal of Science Education and Technology 13, No. 1: 81-88. 2. Christian, W., and Belloni, M. (2001). Physlets: Teaching Physics With Interactive Curricular Material, Prentice Hall, Englewood Cliffs, NJ. 3. Christian,W., and Titus,A. (1998). ``Developing web-based curricula using Java Physlets.'' Computers in Physics 12: 227--232.

  6. Place-based collaboration: Leadership for a changing world

    Directory of Open Access Journals (Sweden)

    Hambleton Robin

    2015-12-01

    Full Text Available Placeless power, meaning the exercise of power by decision-makers who are unconcerned about the impact of their decisions on communities living in particular places, has grown significantly in the last thirty years. A consequence is that societies are becoming more unequal. Even in the wealthy global cities modern capitalism is increasing inequality at a formidable rate. In a new book the author provides an international, comparative analysis of the efforts being made by place-based leaders to create inclusive, sustainable cities. This article draws on the evidence presented in the book to suggest that place-based leaders can play a significant role in advancing social justice, promoting care for the environment and bolstering community empowerment. An opening section introduces the idea of place-based power, providing a context for the subsequent discussion. A second section sets out a new way of conceptualising the roles of place-based leaders in any given context, a framework described as the New Civic Leadership. This distinguishes five different realms of civic leadership. The third section provides an example of place-based leadership in action. It outlines the way local leadership has brought about a remarkable transformation of the central area of Melbourne, Australia. A final section presents a comparative discussion of three themes relating to place-based leadership and local collaboration: (i the changing possibilities for place-based leadership in our rapidly globalising world, (ii the need for outward-facing local government leadership given the changing nature of public policy challenges and (iii the role of place-based leadership in bringing about radical public innovation.

  7. Early Radio and X-Ray Observations of the Youngest nearby Type Ia Supernova PTF 11kly (SN 2011fe)

    NARCIS (Netherlands)

    Horesh, Assaf; Kulkarni, S. R.; Fox, Derek B.; Carpenter, John; Kasliwal, Mansi M.; Ofek, Eran O.; Quimby, Robert; Gal-Yam, Avishay; Cenko, Bradley; de Bruyn, A. G.; Kamble, Atish; Wijers, Ralph A. M. J.; van der Horst, Alexander J.; Kouveliotou, Chryssa; Podsiadlowski, Philipp; Sullivan, Mark; Maguire, Kate; Howell, D. Andrew; Nugent, Peter E.; Gehrels, Neil; Law, Nicholas M.; Poznanski, Dovi; Shara, Michael

    2012-01-01

    On 2011 August 24 (UT) the Palomar Transient Factory (PTF) discovered PTF11kly (SN 2011fe), the youngest and most nearby Type Ia supernova (SN Ia) in decades. We followed this event up in the radio (centimeter and millimeter bands) and X-ray bands, starting about a day after the estimated explosion

  8. Evaluating University-Industry Collaboration: The European Foundation of Quality Management Excellence Model-Based Evaluation of University-Industry Collaboration

    Science.gov (United States)

    Kauppila, Osmo; Mursula, Anu; Harkonen, Janne; Kujala, Jaakko

    2015-01-01

    The growth in university-industry collaboration has resulted in an increasing demand for methods to evaluate it. This paper presents one way to evaluate an organization's collaborative activities based on the European Foundation of Quality Management excellence model. Success factors of collaboration are derived from literature and compared…

  9. USING WIKIS AS A SUPPORT AND ASSESSMENT TOOL IN COLLABORATIVE DIGITAL GAME-BASED LEARNING ENVIRONMENTS

    Directory of Open Access Journals (Sweden)

    Yavuz SAMUR

    2011-04-01

    Full Text Available In computer-supported collaborative learning (CSCL environments, there are many researches done on collaborative learning activities; however, in game-based learning environments, more research and literature on collaborative learning activities are required. Actually, both game-based learning environments and wikis enable us to use new chances for learning, especially in collaborative learning activities. Therefore, in this paper, related literature on wikis and how game & instructional designers can leverage from wikis in game-based learning settings for enhancing students’ collaborative learning activities are examined. Based on the reviewed literature, two main suggestions are given in this paper with their underlying reasons. First, using wikis as a support tool for enhancing collaboration in digital game-based learning (DGBL environments, and second using wikis as an assessment tool in DGBL are suggested.

  10. A Drupal-Based Collaborative Framework for Science Workflows

    Science.gov (United States)

    Pinheiro da Silva, P.; Gandara, A.

    2010-12-01

    Cyber-infrastructure is built from utilizing technical infrastructure to support organizational practices and social norms to provide support for scientific teams working together or dependent on each other to conduct scientific research. Such cyber-infrastructure enables the sharing of information and data so that scientists can leverage knowledge and expertise through automation. Scientific workflow systems have been used to build automated scientific systems used by scientists to conduct scientific research and, as a result, create artifacts in support of scientific discoveries. These complex systems are often developed by teams of scientists who are located in different places, e.g., scientists working in distinct buildings, and sometimes in different time zones, e.g., scientist working in distinct national laboratories. The sharing of these specifications is currently supported by the use of version control systems such as CVS or Subversion. Discussions about the design, improvement, and testing of these specifications, however, often happen elsewhere, e.g., through the exchange of email messages and IM chatting. Carrying on a discussion about these specifications is challenging because comments and specifications are not necessarily connected. For instance, the person reading a comment about a given workflow specification may not be able to see the workflow and even if the person can see the workflow, the person may not specifically know to which part of the workflow a given comments applies to. In this paper, we discuss the design, implementation and use of CI-Server, a Drupal-based infrastructure, to support the collaboration of both local and distributed teams of scientists using scientific workflows. CI-Server has three primary goals: to enable information sharing by providing tools that scientists can use within their scientific research to process data, publish and share artifacts; to build community by providing tools that support discussions between

  11. SNMG: a social-level norm-based methodology for macro-governing service collaboration processes

    Science.gov (United States)

    Gao, Ji; Lv, Hexin; Jin, Zhiyong; Xu, Ping

    2017-08-01

    In order to adapt to the accelerative open tendency of collaborations between enterprises, this paper proposes a Social-level Norm-based methodology for Macro-Governing service collaboration processes, called SNMG, to regulate and control the social-level visible macro-behaviors of the social individuals participating in collaborations. SNMG not only can remove effectively the uncontrollability hindrance confronted with by open social activities, but also enables across-management-domain collaborations to be implemented by uniting the centralized controls of social individuals for respective social activities. Therefore, this paper provides a brand-new system construction mode to promote the development and large-scale deployment of service collaborations.

  12. Improved spring model-based collaborative indoor visible light positioning

    Science.gov (United States)

    Luo, Zhijie; Zhang, WeiNan; Zhou, GuoFu

    2016-06-01

    Gaining accuracy with indoor positioning of individuals is important as many location-based services rely on the user's current position to provide them with useful services. Many researchers have studied indoor positioning techniques based on WiFi and Bluetooth. However, they have disadvantages such as low accuracy or high cost. In this paper, we propose an indoor positioning system in which visible light radiated from light-emitting diodes is used to locate the position of receivers. Compared with existing methods using light-emitting diode light, we present a high-precision and simple implementation collaborative indoor visible light positioning system based on an improved spring model. We first estimate coordinate position information using the visible light positioning system, and then use the spring model to correct positioning errors. The system can be employed easily because it does not require additional sensors and the occlusion problem of visible light would be alleviated. We also describe simulation experiments, which confirm the feasibility of our proposed method.

  13. A Simulation-Based LED Design Project in Photonics Instruction Based on Industry-University Collaboration

    Science.gov (United States)

    Chang, S. -H.; Chen, M. -L.; Kuo, Y. -K.; Shen, Y. -C.

    2011-01-01

    In response to the growing industrial demand for light-emitting diode (LED) design professionals, based on industry-university collaboration in Taiwan, this paper develops a novel instructional approach: a simulation-based learning course with peer assessment to develop students' professional skills in LED design as required by industry as well as…

  14. Improving Student Teamwork in a Collaborative Project-Based Course

    Science.gov (United States)

    Kapp, Edward

    2009-01-01

    While collaborative student projects can be effective in improving student learning, the failure of students to work together effectively remains a widely reported problem in collaborative learning. This article describes a team-building intervention designed to improve the students' abilities to work together in teams successfully. The…

  15. Multiple Mice Based Collaborative One-to-One Learning

    Science.gov (United States)

    Infante, Cristian; Hidalgo, Pedro; Nussbaum, Miguel; Alarcon, Rosa; Gottlieb, Andres

    2009-01-01

    Exchange is a collaborative learning application, originally developed for wirelessly interconnected Pocket PCs, that provides support for students and a teacher performing a face-to-face computer supported collaborative learning (CSCL) activity in a Single Input/Single Display (SISD) mode. We extend the application to support a single display…

  16. Readerbench: Automated Evaluation of Collaboration Based on Cohesion and Dialogism

    Science.gov (United States)

    Dascalu, Mihai; Trausan-Matu, Stefan; McNamara, Danielle S.; Dessus, Philippe

    2015-01-01

    As Computer-Supported Collaborative Learning (CSCL) gains a broader usage, the need for automated tools capable of supporting tutors in the time-consuming process of analyzing conversations becomes more pressing. Moreover, collaboration, which presumes the intertwining of ideas or points of view among participants, is a central element of dialogue…

  17. A novel subset of enteric neurons revealed by ptf1a:GFP in the developing zebrafish enteric nervous system.

    Science.gov (United States)

    Uribe, Rosa A; Gu, Tiffany; Bronner, Marianne E

    2016-03-01

    The enteric nervous system, the largest division of the peripheral nervous system, is derived from vagal neural crest cells that invade and populate the entire length of the gut to form diverse neuronal subtypes. Here, we identify a novel population of neurons within the enteric nervous system of zebrafish larvae that express the transgenic marker ptf1a:GFP within the midgut. Genetic lineage analysis reveals that enteric ptf1a:GFP(+) cells are derived from the neural crest and that most ptf1a:GFP(+) neurons express the neurotransmitter 5HT, demonstrating that they are serotonergic. This transgenic line, Tg(ptf1a:GFP), provides a novel neuronal marker for a subpopulation of neurons within the enteric nervous system, and highlights the possibility that Ptf1a may act as an important transcription factor for enteric neuron development.

  18. SibRank: Signed bipartite network analysis for neighbor-based collaborative ranking

    Science.gov (United States)

    Shams, Bita; Haratizadeh, Saman

    2016-09-01

    Collaborative ranking is an emerging field of recommender systems that utilizes users' preference data rather than rating values. Unfortunately, neighbor-based collaborative ranking has gained little attention despite its more flexibility and justifiability. This paper proposes a novel framework, called SibRank that seeks to improve the state of the art neighbor-based collaborative ranking methods. SibRank represents users' preferences as a signed bipartite network, and finds similar users, through a novel personalized ranking algorithm in signed networks.

  19. Towards a Personalised, Learning Style Based Collaborative Blended Learning Model with Individual Assessment

    OpenAIRE

    Ilona BÉRES; Tímea MAGYAR; Turcsányi-Szabó, Márta

    2012-01-01

    In this paper we aim to describe the process by which our personalised web-based collaborative teaching/learning methodology (CECIP - Collaboration - Evaluation - Critical thinking - Individual assessment - learner Profile) evolved originating from Vygotsky's theory and based on the (C) collaborative construction of student's knowledge, (E) developing evaluation and assessment skills, (C) developing critical thinking skills, (I) integrating individual evaluation and (P) generating learner pro...

  20. A scenario-based study on information flow and collaboration patterns in disaster management.

    Science.gov (United States)

    Sagun, Aysu; Bouchlaghem, Dino; Anumba, Chimay J

    2009-04-01

    Disaster management (DM) is a continuous, highly collaborative process involving governments, DM organisations, responders, the construction sector, and the general public. Most research approaches to DM include the development of information and communication technologies (ICT) to support the collaboration process rather than the creation of a collaboration process to provide information flows and patterns. An Intelligent Disaster Collaboration System (IDCS) is introduced in this paper as a conceptual model to integrate ICT into DM and the mitigation process and to enhance collaboration. The framework is applicable to the collaboration process at the local, regional and national levels. Within this context, the deployment of ICT tools in DM is explored and scenario-based case studies on flooding and terrorism--examples of natural and human-induced disasters, respectively--are presented. Conclusions are drawn regarding the differences found in collaboration patterns and ICT used during natural and human-induced disasters and the differences between currently available ICT and proposed ICT.

  1. Visualizing and evaluating the growth of multi-institutional collaboration based on research network analysis.

    Science.gov (United States)

    Luo, Jake; Pelfrey, Clara; Zhang, Guo-Qiang

    2014-01-01

    Research collaboration plays an important role in scientific productivity and academic innovation. Multi-institutional collaboration has become a vital approach for integrating multidisciplinary resources and expertise to enhance biomedical research. There is an increasing need for analyzing the effect of multi-institutional research collaboration. In this paper, we present a collaboration analysis pipeline based on research networks constructed from publication co-authorship relationship. Such research networks can be effectively used to render and analyze large-scale institutional collaboration. The co-authorship networks of the Cleveland Clinical and Translational Science Collaborative (CTSC) were visualized and analyzed. SciVal Expert™ was used to extract publication data of the CTSC members. The network was presented in informative and aesthetically appealing diagrams using the open source visualization package Gephi. The analytic result demonstrates the effectiveness of our approach, and it also indicates the substantial growth of research collaboration among the CTSC members crossing its partner institutions.

  2. A collaborative model for supporting community-based interdisciplinary education.

    Science.gov (United States)

    Carney, Patricia A; Schifferdecker, Karen E; Pipas, Catherine F; Fall, Leslie H; Poor, Daniel A; Peltier, Deborah A; Nierenberg, David W; Brooks, W Blair

    2002-07-01

    Development and support of community-based, interdisciplinary ambulatory medical education has achieved high priority due to on-site capacity and the unique educational experiences community sites contribute to the educational program. The authors describe the collaborative model their school developed and implemented in 2000 to integrate institution- and community-based interdisciplinary education through a centralized office, the strengths and challenges faced in applying it, the educational outcomes that are being tracked to evaluate its effectiveness, and estimates of funds needed to ensure its success. Core funding of $180,000 is available annually for a centralized office, the keystone of the model described here. With this funding, the office has (1) addressed recruitment, retention, and quality of educators for UME; (2) promoted innovation in education, evaluation, and research; (3) supported development of a comprehensive curriculum for medical school education; and (4) monitored the effectiveness of community-based education programs by tracking product yield and cost estimates needed to generate these programs. The model's Teaching and Learning Database contains information about more than 1,500 educational placements at 165 ambulatory teaching sites (80% in northern New England) involving 320 active preceptors. The centralized office facilitated 36 site visits, 22% of which were interdisciplinary, involving 122 preceptors. A total of 98 follow-up requests by community-based preceptors were fulfilled in 2000. The current submission-to-funding ratio for educational grants is 56%. Costs per educational activity have ranged from $811.50 to $1,938, with costs per preceptor ranging from $101.40 to $217.82. Cost per product (grants, manuscripts, presentations) in research and academic scholarship activities was $2,492. The model allows the medical school to balance institutional and departmental support for its educational programs, and to better position

  3. Research on Collaborative Knowledge Innovation Based on System Dynamics

    Directory of Open Access Journals (Sweden)

    Wang Xiuhong

    2012-11-01

    Full Text Available Constructing the rational knowledge network is an effective means of cooperative innovation organization. But collaborative innovation organization system is relatively complicated, and knowledge itself is latent and unexpected, knowledge network is not comprehensive and accurate. This paper analyzes deeply knowledge network of organization cooperative innovation, and builds a system dynamics model about knowledge network of collaborative innovation by using the system dynamics model and function of simulation of special drawing. Accorfing to the abovr medel, we can clearly conclude the key factor in the system, and quantitatively reveal the knowledge sharing which is the most important collaborative innovation rule in knowledge organization network.

  4. Collage, a Collaborative Learning Design Editor Based on Patterns

    NARCIS (Netherlands)

    Hernández-Leo, Davinia; Villasclaras-Fernández, Eloy; Jorrín-Abellán, Iván; Asensio-Pérez, Juan; Dimitriadis, Yannis; Ruiz-Requies, Inés; Rubia-Avi, Bartolomé

    2006-01-01

    CSCL (Computer-Supported Collaborative Learning) constitutes a significant field that has drawn the attention of many researchers and practitioners (Dillenbourg, 2002). This domain is characterized by the coexistence of very different expectations, requirements, knowledge and interests posed by both

  5. Collage, a Collaborative Learning Design Editor Based on Patterns

    NARCIS (Netherlands)

    Hernández-Leo, Davinia; Villasclaras-Fernández, Eloy; Jorrín-Abellán, Iván; Asensio-Pérez, Juan; Dimitriadis, Yannis; Ruiz-Requies, Inés; Rubia-Avi, Bartolomé

    2006-01-01

    CSCL (Computer-Supported Collaborative Learning) constitutes a significant field that has drawn the attention of many researchers and practitioners (Dillenbourg, 2002). This domain is characterized by the coexistence of very different expectations, requirements, knowledge and interests posed by both

  6. A Web-Based Development Environment for Collaborative Data Analysis

    Science.gov (United States)

    Erdmann, M.; Fischer, R.; Glaser, C.; Klingebiel, D.; Komm, M.; Müller, G.; Rieger, M.; Steggemann, J.; Urban, M.; Winchen, T.

    2014-06-01

    Visual Physics Analysis (VISPA) is a web-based development environment addressing high energy and astroparticle physics. It covers the entire analysis spectrum from the design and validation phase to the execution of analyses and the visualization of results. VISPA provides a graphical steering of the analysis flow, which consists of self-written, re-usable Python and C++ modules for more demanding tasks. All common operating systems are supported since a standard internet browser is the only software requirement for users. Even access via mobile and touch-compatible devices is possible. In this contribution, we present the most recent developments of our web application concerning technical, state-of-the-art approaches as well as practical experiences. One of the key features is the use of workspaces, i.e. user-configurable connections to remote machines supplying resources and local file access. Thereby, workspaces enable the management of data, computing resources (e.g. remote clusters or computing grids), and additional software either centralized or individually. We further report on the results of an application with more than 100 third-year students using VISPA for their regular particle physics exercises during the winter term 2012/13. Besides the ambition to support and simplify the development cycle of physics analyses, new use cases such as fast, location-independent status queries, the validation of results, and the ability to share analyses within worldwide collaborations with a single click become conceivable.

  7. Users' Attitudes toward Web-Based Collaborative Learning Systems for Knowledge Management

    Science.gov (United States)

    Liaw, Shu-Sheng; Chen, Gwo-Dong; Huang, Hsiu-Mei

    2008-01-01

    The Web-based technology is a potential tool for supported collaborative learning that may enrich learning performance, such as individual knowledge construction or group knowledge sharing. Thus, understanding Web-based collaborative learning for knowledge management is a critical issue. The present study is to investigate learners' attitudes…

  8. Evaluating the Usage of Cloud-Based Collaboration Services through Teamwork

    Science.gov (United States)

    Qin, Li; Hsu, Jeffrey; Stern, Mel

    2016-01-01

    With the proliferation of cloud computing for both organizational and educational use, cloud-based collaboration services are transforming how people work in teams. The authors investigated the determinants of the usage of cloud-based collaboration services including teamwork quality, computer self-efficacy, and prior experience, as well as its…

  9. Collaborative Project-Based Learning: An Integrative Science and Technological Education Project

    Science.gov (United States)

    Baser, Derya; Ozden, M. Yasar; Karaarslan, Hasan

    2017-01-01

    Background: Blending collaborative learning and project-based learning (PBL) based on Wolff (2003) design categories, students interacted in a learning environment where they developed their technology integration practices as well as their technological and collaborative skills. Purpose: The study aims to understand how seventh grade students…

  10. Evaluating the Usage of Cloud-Based Collaboration Services through Teamwork

    Science.gov (United States)

    Qin, Li; Hsu, Jeffrey; Stern, Mel

    2016-01-01

    With the proliferation of cloud computing for both organizational and educational use, cloud-based collaboration services are transforming how people work in teams. The authors investigated the determinants of the usage of cloud-based collaboration services including teamwork quality, computer self-efficacy, and prior experience, as well as its…

  11. Collaborative Script-Based Experiences for Bilingual Speech-Language Pathology Trainees

    Science.gov (United States)

    Bedore, Lisa M.; Perez, Anita Mendez; White, Melissa D.

    2008-01-01

    The advantages and the significance of the collaborative script-based experiences for the trainees of the bilingual speech-language pathology are explained. The clinicians are shown to collaborate with expert clinicians and educators to reach common goals in such script-based experiences.

  12. PAMS - A New Collaborative Framework for Agent-Based Simulation of Complex Sysems

    OpenAIRE

    Nguyen Trong, Khanh; Marilleau, Nicolas; Vinh Ho, Tuong

    2008-01-01

    International audience; Major researches in the domain of complex systems are interdisciplinary, collaborative and geographically distributed. The purpose of our work is to explore a new collaborative approach that facilitates scientist's interactions during the modelling and simulating process. The originality of the presented approach is to consider models and simulators as a board of the collaboration: a shared object manipulated by a group of scientists. Agent-based simulations are powerf...

  13. Collaborative Assessment of the Automotive Sales Service Based on Co-Entropy

    Directory of Open Access Journals (Sweden)

    Dingfu Jiang

    2013-04-01

    Full Text Available Co-entropy function was constructed based on dissipative structure, collaboration and entropy theory, while co-entropy of each management level in automotive sales service and the mathematical quantified assessment model of collaborative efficiency were built. In combination with the collaborative management activity of automotive sales service in an automotive sales company in Shanghai, the model and viewpoints presented here were applied and verified through empirical research.

  14. PTF, a new facility for pulse field testing of large scale superconducting cables and joints

    NARCIS (Netherlands)

    Smith, Bradford A.; Hale, J. Richard; Zhukovsky, Alex; Michael, Philip C.; Minervini, Joseph V.; Olmstead, Michael M.; Dekow, Gary L.; Rosati, James; Camille, Richard J.; Gung, Chen-yu; Gwinn, David; Silva, Frank; Fairfax, Stephen A.; Shen, Stewart; Knoopers, H.G.; Wessel, S.; Krooshoop, H.J.G.; Shevchenko, O.A.; Godeke, A.; Kate, ten H.H.J.

    1997-01-01

    A magnetic Pulse Test Facility (PTF), in which samples of CICC electrical joints from each ITER home team will be tested, has been fabricated at the MIT Plasma Fusion Center under an ITER task agreement. Construction of this facility has recently been completed, and an initial test phase on the firs

  15. A Triple-energy-source Model for Superluminous Supernova iPTF13ehe

    Science.gov (United States)

    Wang, S. Q.; Liu, L. D.; Dai, Z. G.; Wang, L. J.; Wu, X. F.

    2016-09-01

    Almost all superluminous supernovae (SLSNe) whose peak magnitudes are ≲ -21 mag can be explained by the 56Ni-powered model, the magnetar-powered (highly magnetized pulsar) model, or the ejecta-circumstellar medium (CSM) interaction model. Recently, iPTF13ehe challenged these energy-source models, because the spectral analysis shows that ˜ 2.5{M}⊙ of 56Ni have been synthesized, but are inadequate to power the peak bolometric emission of iPTF13ehe, while the rebrightening of the late-time light curve (LC) and the Hα emission lines indicate that the ejecta-CSM interaction must play a key role in powering the late-time LC. Here we propose a triple-energy-source model, in which a magnetar together with some amount (≲ 2.5{M}⊙ ) of 56Ni may power the early LC of iPTF13ehe, while the late-time rebrightening can be quantitatively explained by an ejecta-CSM interaction. Furthermore, we suggest that iPTF13ehe is a genuine core-collapse supernova rather than a pulsational pair-instability supernova candidate. Further studies on similar SLSNe in the future would eventually shed light on their explosion and energy-source mechanisms.

  16. PTF; a new facility for pulse field testing of large scale superconducting

    NARCIS (Netherlands)

    Smith, Bradford A.; Hale, J. Richard; Zhukovsky, Alex; Michael, Philip C.; Minervini, Joseph V.; Olmstead, Michael M.; Dekow, Gary L.; Rosati, James; Camille, Richard J.; Gung, Chen-yu; Gwinn, David; Silva, Frank; Fairfax, Stephen A.; Shen, Stewart; Knoopers, H.G.; Wessel, Wilhelm A.J.; Krooshoop, Hendrikus J.G.; Chevtchenko, O.A.; Godeke, A.; ten Kate, Herman H.J.

    1997-01-01

    A magnetic Pulse Test Facility (PTF), in which samples of CICC electrical joints from each ITER home team will be tested, has been fabricated at the MIT Plasma Fusion Center under an ITER task agreement. Construction of this facility has recently been completed, and an initial test phase on the

  17. Resource Allocation Optimization Model of Collaborative Logistics Network Based on Bilevel Programming

    Directory of Open Access Journals (Sweden)

    Xiao-feng Xu

    2017-01-01

    Full Text Available Collaborative logistics network resource allocation can effectively meet the needs of customers. It can realize the overall benefit maximization of the logistics network and ensure that collaborative logistics network runs orderly at the time of creating value. Therefore, this article is based on the relationship of collaborative logistics network supplier, the transit warehouse, and sellers, and we consider the uncertainty of time to establish a bilevel programming model with random constraints and propose a genetic simulated annealing hybrid intelligent algorithm to solve it. Numerical example shows that the method has stronger robustness and convergence; it can achieve collaborative logistics network resource allocation rationalization and optimization.

  18. An optimized item-based collaborative filtering recommendation algorithm based on item genre prediction

    Science.gov (United States)

    Zhang, De-Jia

    2009-07-01

    With the fast development of Internet, many systems have emerged in e-commerce applications to support the product recommendation. Collaborative filtering is one of the most promising techniques in recommender systems, providing personalized recommendations to users based on their previously expressed preferences in the form of ratings and those of other similar users. In practice, with the adding of user and item scales, user-item ratings are becoming extremely sparsity and recommender systems utilizing traditional collaborative filtering are facing serious challenges. To address the issue, this paper presents an approach to compute item genre similarity, through mapping each item with a corresponding descriptive genre, and computing similarity between genres as similarity, then make basic predictions according to those similarities to lower sparsity of the user-item ratings. After that, item-based collaborative filtering steps are taken to generate predictions. Compared with previous methods, the presented collaborative filtering employs the item genre similarity can alleviate the sparsity issue in the recommender systems, and can improve accuracy of recommendation.

  19. Distributing Knight. Using Type-Based Publish/Subscribe for Building Distributed Collaboration Tools

    DEFF Research Database (Denmark)

    Damm, Christian Heide; Hansen, Klaus Marius

    2002-01-01

    Distributed applications are hard to understand, build, and evolve. The need for decoupling, flexibility, and heterogeneity in distributed collaboration tools present particular problems; for such applications, having the right abstractions and primitives for distributed communication becomes even...... more important. We present Distributed Knight, an extension to the Knight tool, for distributed, collaborative, and gesture-based object-oriented modelling. Distributed Knight was built using the type-based publish/subscribe paradigm. Based on this case, we argue that type-based publish....../subscribe provides a natural and effective abstraction for developing distributed collaboration tools....

  20. Nonprofit Organizations and Innovation: A Model of Neighborhood-Based Collaboration to Prevent Child Maltreatment.

    Science.gov (United States)

    Mulroy, Elizabeth A.; Shay, Sharon

    1997-01-01

    Outlines a theoretical and conceptual framework for neighborhood-based collaboration by nonprofit organizations. Analyzes the main concepts of innovation in the design and implementation of a collaboration to prevent child maltreatment in an undervalued neighborhood and draws implications for social policy, social work practice, and social work…

  1. Exploring the Influences of Elementary School Students' Learning Motivation on Web-Based Collaborative Learning

    Science.gov (United States)

    Chin-Fei, Huang; Chia-Ju, Liu

    2012-01-01

    The purpose of this study is to explore the influences of students' learning motivation on Web-based collaborative learning. This study conducted learning materials of Web pages about science and collaborative learning, a motivation questionnaire and interviews were used for data collection. Eighty Grade 5 students and a science teacher were…

  2. Collaborating to Improve Inquiry-Based Teaching in Elementary Science and Mathematics Methods Courses

    Science.gov (United States)

    Magee, Paula A.; Flessner, Ryan

    2012-01-01

    This study examines the effect of promoting inquiry-based teaching (IBT) through collaboration between a science methods course and mathematics methods course in an elementary teacher education program. During the collaboration, preservice elementary teacher (PST) candidates experienced 3 different types of inquiry as a way to foster increased…

  3. Proactive behaviour may lead to failure in virtual project-based collaborative learning

    DEFF Research Database (Denmark)

    Bjørn, Pernille; Hertzum, Morten

    2005-01-01

    This paper argues that proactive behaviour, caused by high engagement and motivation of the learners, may lead to failure of collaborative learning. By examining empirical data from real-world text-only virtual negotiations between dispersed participants engaged in project-based collaborative...

  4. ReaderBench: Automated evaluation of collaboration based on cohesion and dialogism

    NARCIS (Netherlands)

    Dascalu, Mihai; Trausan-Matu, Stefan; McNamara, Danielle; Dessus, Philippe

    2016-01-01

    Dascalu, M., Trausan-Matu, S., McNamara, D.S., & Dessus, P. (2015). ReaderBench – Automated Evaluation of Collaboration based on Cohesion and Dialogism. International Journal of Computer-Supported Collaborative Learning, 10(4), 395–423. doi: 10.1007/s11412-015-9226-y

  5. Supporting Real-Time Collaborative Learning with Web-Based Groupware

    Science.gov (United States)

    Chan, Stephen C. F.; Leung, Cane W. K.; Yeung, Cassidy Y.; Chow, Teddy C. Y.; Tsui, Edward W. C.; Ng, Vincent T. Y.

    2005-01-01

    The Wireless Online Tutoring System (WOTS) is a web-based, synchronous groupware system that has been developed to facilitate student collaboration in group projects. It supports interactive and collaborative structured-diagramming and is equipped with group awareness features such as remote cursors, locking, and textbased instant messaging. Users…

  6. iPTF Discovery of the Rapid “Turn-on” of a Luminous Quasar

    Science.gov (United States)

    Gezari, S.; Hung, T.; Cenko, S. B.; Blagorodnova, N.; Yan, Lin; Kulkarni, S. R.; Mooley, K.; Kong, A. K. H.; Cantwell, T. M.; Yu, P. C.; Cao, Y.; Fremling, C.; Neill, J. D.; Ngeow, C.-C.; Nugent, P. E.; Wozniak, P.

    2017-02-01

    We present a radio-quiet quasar at z = 0.237 discovered “turning on” by the intermediate Palomar Transient Factory (iPTF). The transient, iPTF 16bco, was detected by iPTF in the nucleus of a galaxy with an archival Sloan Digital Sky Survey spectrum with weak narrow-line emission characteristic of a low-ionization nuclear emission-line region (LINER). Our follow-up spectra show the dramatic appearance of broad Balmer lines and a power-law continuum characteristic of a luminous ({L}{bol}≈ {10}45 erg s‑1) type 1 quasar 12 yr later. Our photometric monitoring with PTF from 2009–2012 and serendipitous X-ray observations from the XMM-Newton Slew Survey in 2011 and 2015 constrain the change of state to have occurred less than 500 days before the iPTF detection. An enhanced broad Hα/[O iii] λ5007 line ratio in the type 1 state relative to other changing-look quasars also is suggestive of the most rapid change of state yet observed in a quasar. We argue that the >10 increase in Eddington ratio inferred from the brightening in UV and X-ray continuum flux is more likely due to an intrinsic change in the accretion rate of a preexisting accretion disk than an external mechanism such as variable obscuration, microlensing, or the tidal disruption of a star. However, further monitoring will be helpful in better constraining the mechanism driving this change of state. The rapid “turn-on” of the quasar is much shorter than the viscous infall timescale of an accretion disk and requires a disk instability that can develop around a ∼ {10}8 {M}ȯ black hole on timescales less than 1 yr.

  7. A task-oriented modular and agent-based collaborative design mechanism for distributed product development

    Science.gov (United States)

    Liu, Jinfei; Chen, Ming; Wang, Lei; Wu, Qidi

    2014-05-01

    The rapid expansion of enterprises makes product collaborative design (PCD) a critical issue under the distributed heterogeneous environment, but as the collaborative task of large-scale network becomes more complicated, neither unified task decomposition and allocation methodology nor Agent-based network management platform can satisfy the increasing demands. In this paper, to meet requirements of PCD for distributed product development, a collaborative design mechanism based on the thought of modularity and the Agent technology is presented. First, the top-down 4-tier process model based on task-oriented modular and Agent is constructed for PCD after analyzing the mapping relationships between requirements and functions in the collaborative design. Second, on basis of sub-task decomposition for PCD based on a mixed method, the mathematic model of task-oriented modular based on multi-objective optimization is established to maximize the module cohesion degree and minimize the module coupling degree, while considering the module executable degree as a restriction. The mathematic model is optimized and simulated by the modified PSO, and the decomposed modules are obtained. Finally, the Agent structure model for collaborative design is put forward, and the optimism matching Agents are selected by using similarity algorithm to implement different task-modules by the integrated reasoning and decision-making mechanism with the behavioral model of collaborative design Agents. With the results of experimental studies for automobile collaborative design, the feasibility and efficiency of this methodology of task-oriented modular and Agent-based collaborative design in the distributed heterogeneous environment are verified. On this basis, an integrative automobile collaborative R&D platform is developed. This research provides an effective platform for automobile manufacturing enterprises to achieve PCD, and helps to promote product numeralization collaborative R&D and

  8. Grappling with Collaboration: Would Opening Up the Research 'Base' Help?

    Science.gov (United States)

    Forbes, Joan

    2003-01-01

    This article draws on postmodern research approaches and Michael Foucault's views of "discourse" to examine theoretical perspectives previously applied to collaboration, and argues for the value of further theoretical diversity and methodological plurality. It introduces discourse analysis as a tool for helping to understand the notion of…

  9. Web-Based Collaboration Technology and Requirements for Peace Operations

    Science.gov (United States)

    2002-03-01

    platform-neutral asynchronous collaborative authoring via the Internet. Internationalization ( I18N ) and localization ( L10N ) addresses differences in...via the Internet. Internationalization ( I18N ) and localization ( L10N ) addresses differences in language requirements and local expectations that...17 D. INTERNATIONALIZATION ( I18N ) .........................................................19 E. LOCALIZATION ( L10N

  10. Grappling with Collaboration: Would Opening Up the Research 'Base' Help?

    Science.gov (United States)

    Forbes, Joan

    2003-01-01

    This article draws on postmodern research approaches and Michael Foucault's views of "discourse" to examine theoretical perspectives previously applied to collaboration, and argues for the value of further theoretical diversity and methodological plurality. It introduces discourse analysis as a tool for helping to understand the notion of…

  11. COLLAGE: A Collaborative Learning Design Editor Based on Patterns

    Science.gov (United States)

    Hernandez-Leo, Davinia; Villasclaras-Fernandez, Eloy D.; Asensio-Perez, Juan I.; Dimitriadis, Yannis; Jorrin-Abellan, Ivan M.; Ruiz-Requies, Ines; Rubia-Avi, Bartolome

    2006-01-01

    This paper introduces "Collage", a high-level IMS-LD compliant authoring tool that is specialized for CSCL (Computer-Supported Collaborative Learning). Nowadays CSCL is a key trend in e-learning since it highlights the importance of social interactions as an essential element of learning. CSCL is an interdisciplinary domain, which…

  12. COLLABORATIVE WEB RECOMMENDATION SYSTEMS BASED ON AN EFFECTIVE FUZZY ASSOCIATION RULE MINING ALGORITHM (FARM)

    OpenAIRE

    Dr. P. THAMBIDURAI; A.KUMAR,

    2010-01-01

    With increasing popularity of the web-based systems that are applied in many different areas, they tend to deliver customized informationfor their users by means of utilization of recommendation methods. This recommendation system is mainly classified into two groups:Content-based recommendation and collaborative recommendation system. Content based recommendation tries to recommend web sites similar to those web sites the user has liked, whereas collaborative ecommendation tries to find som...

  13. Capability Model for Case-Based Reasoning in Collaborative Commerce Environment

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    Collaborative commerce (c-commerce) has become an innovative business paradigm that helps companies achieve high operational performance through inter-organizational collaboration. This paper presents an effective case-based reasoning (CBR) capability model for solution selection in c-commerce applications, as CBR is widely used in knowledge management and electronic commerce.Based on the case-based competence model suggested by Smyth and McKenna, a directed graph was used to represent the collaborative reasoning history of CBR systems, where information of reasoning process ability was extracted. Experiment was carried out on a travel dataset. By integrating case-based competence and reasoning process ability, the capability is more suitable to reflect the real ability of CBR systems. The result shows that the proposed method can effectively evaluate the capability of CBR systems and enhance the performance of collaborative case-based reasoning in c-commerce environment.

  14. Evidence-Based Librarianship: An Opportunity for Research Collaboration

    Directory of Open Access Journals (Sweden)

    Jonathan Eldredge、Lin Ye

    2000-04-01

    Full Text Available

    頁次:110-114

    Objective:

    To encourage health sciences librarians in Taiwan to submit structured abstracts in English that summarize their library-related research projects to the periodical Hypothesis. These abstracts are intended to raise awareness about relevant Taiwanese research primarily among health sciences librarians in the US. This awareness might result in US librarians citing Taiwanese library science journals more frequently and lead to greater US-Taiwan research collaboration in the future.

    Method:

    Narrative essay. Presents elements of a standard structured abstract and a sample structured abstract based upon one of the primary author's recent publications.

    EDM COLLABORATIVE MANUFACTURING SYSTEM BASED ON MULTI-AGENT TECHNIQUES

    Institute of Scientific and Technical Information of China (English)

    Zhao Wansheng; Zhao Jinzhi; Song Yinghui; Yang Xiaodong

    2003-01-01

    A framework for building EDM collaborative manufacturing system using multi-agent technology to support organizations characterized by physically distributed, enterprise-wide, heterogeneous intelligent manufacturing system over Internet is proposed. Expert system theory is introduced.Design, manufacturing and technological knowledge are shared using artificial intelligence and web techniques by EDM-CADagent, EDM-CAMagent and EDM-CAPPagent. System structure, design process, network conditions, realization methods and other key techniques are discussed. Instances are also introduced to testify feasibility.

  15. Structuring Task-based Interaction through Collaborative Learning Techniques (2)

    Institute of Scientific and Technical Information of China (English)

    William Littlewood

    2004-01-01

    @@ Techniques for collaborative learning In this section the focus will move from broad strategies to specific techniques (often also called "structures") through which the strategies can be realized. It gives a selection of techniques which have proved (in my own experience as well as that of others) particularly useful in pro-viding contexts for practice, exploration and /or interaction in the second language classroom.

  16. Principles and tools for collaborative entity-based intelligence analysis.

    Science.gov (United States)

    Bier, Eric A; Card, Stuart K; Bodnar, John W

    2010-01-01

    Software tools that make it easier for analysts to collaborate as a natural part of their work will lead to better analysis that is informed by more perspectives. We are interested to know if software tools can be designed that support collaboration even as they allow analysts to find documents and organize information (including evidence, schemas, and hypotheses). We have modified the Entity Workspace system, described previously, to test such designs. We have evaluated the resulting design in both a laboratory study and a study where it is situated with an analysis team. In both cases, effects on collaboration appear to be positive. Key aspects of the design include an evidence notebook optimized for organizing entities (rather than text characters), information structures that can be collapsed and expanded, visualization of evidence that emphasizes events and documents (rather than emphasizing the entity graph), and a notification system that finds entities of mutual interest to multiple analysts. Long-term tests suggest that this approach can support both top-down and bottom-up styles of analysis.

  17. Knowledge collaborative incentive based on inter-organizational cooperative innovation of project-based supply chain

    Directory of Open Access Journals (Sweden)

    Guangdong Wu

    2013-09-01

    Full Text Available Purpose: Within project-based supply chain inter-organizational cooperative innovation, the achievement of project value-adding reflects by factors such as project-based organizational effect level, the relationship between project cooperative innovation objectives etc. The purpose is to provide a reliable reference for the contractor reasonably allocate the effect level and resources between the knowledge input and innovation stage and realize the knowledge collaboration for project-based supply chain. Design/methodology/approach: Based on the assumption of equal cooperation between project-based organizations, from the view of maximizing project value-adding and the relationship of effect cost between knowledge input and innovation stage in consideration, the knowledge collaborative incentive model for project-based supply chain inter-organizational cooperative innovation was established, and solved through the first-order and second-order approach, then the digital simulation and example analysis were presented. Findings: The results show that, the project management enterprise resorted to adjust project knowledge collaboration incentive intensity and implemented knowledge input-innovation coordinative incentive strategy, not only could achieve project value-adding maximization, but also could realize net earnings Pareto improvement between project management enterprise and contractor. Research limitations/implications: To simplify the knowledge flow among project-based organizations, the knowledge flow in the model hypothesis is presented as knowledge input and knowledge innovation stage, thus it may affect the final analysis results. Originality/value: In construction project practice, knowledge is become more and more important to achieve project value-adding. The research can provide a theoretical guideline for the project-based organizations, such as the contractor, the owner, especially how to utilize their core knowledge.

  18. Fuzzy comprehensive evaluation model of interuniversity collaborative learning based on network

    Science.gov (United States)

    Wenhui, Ma; Yu, Wang

    2017-06-01

    Learning evaluation is an effective method, which plays an important role in the network education evaluation system. But most of the current network learning evaluation methods still use traditional university education evaluation system, which do not take into account of web-based learning characteristics, and they are difficult to fit the rapid development of interuniversity collaborative learning based on network. Fuzzy comprehensive evaluation method is used to evaluate interuniversity collaborative learning based on the combination of fuzzy theory and analytic hierarchy process. Analytic hierarchy process is used to determine the weight of evaluation factors of each layer and to carry out the consistency check. According to the fuzzy comprehensive evaluation method, we establish interuniversity collaborative learning evaluation mathematical model. The proposed scheme provides a new thought for interuniversity collaborative learning evaluation based on network.

  19. Outcomes-Based Collaborative Teaching and Learning in Asian Higher Education

    Science.gov (United States)

    van Schalkwyk, Gertina J.

    2015-01-01

    This chapter explores the background and development of outcomes-based collaborative teaching and learning, and provides guidance for writing learning outcomes and engaging students in the Asian higher education context.

  1. Supply Chain Collaboration Risk Evaluation Based on Trapezoidal Fuzzy Numbers Similarity

    Directory of Open Access Journals (Sweden)

    Lei Wen

    2013-02-01

    Full Text Available Supply chains are confronted with more complicated risks on the current financial crisis, as makes risk control in supply chain management more exigent. Supply chain collaboration, as the important part of supply chain management, is the key method of improving supply chains profits. This study introduces risk management into the mechanism of supply chain collaboration. In supply chain risk management, supply chain collaboration risk is recognized as an important section which can help SCM more efficiently. This study is aimed to present a collaboration risk analysis methods based on trapezoidal fuzzy numbers similarity to solve this problem. By using two linguist terms probability of failure and severity of loss, supply chain collaboration risk can be calculated and expressed with linguistic term. At last, an example is used to identify the efficiency of this method.

  2. Spectral Collaborative Representation based Classification for Hand Gestures recognition on Electromyography Signals

    OpenAIRE

    Boyali, Ali

    2015-01-01

    In this study, we introduce a novel variant and application of the Collaborative Representation based Classification in spectral domain for recognition of the hand gestures using the raw surface Electromyography signals. The intuitive use of spectral features are explained via circulant matrices. The proposed Spectral Collaborative Representation based Classification (SCRC) is able to recognize gestures with higher levels of accuracy for a fairly rich gesture set. The worst recognition result...

  3. E-Government and Geographical Information Based Collaboration Patterns

    DEFF Research Database (Denmark)

    Schrøder, Lise; Hvingel, Line Træholt; Hansen, Henning Sten

    2010-01-01

    in regard of e-Government readiness. In Denmark the development of e-Government is characterised by a very informal, bottom-up approach, with a focus on standardisation, the use of geographic information systems (GIS) and IT-architecture. The organisational aspects have not been an issue of much attention....... A national survey conducted by the University of Aalborg and Geoforum Denmark shows that the way the different players actually collaborate is a determining factor for a successful development in the field of e-Government....

  4. Towards Effective Trust-Based Packet Filtering in Collaborative Network Environments

    DEFF Research Database (Denmark)

    Meng, Weizhi; Li, Wenjuan; Kwok, Lam-For

    2017-01-01

    Overhead network packets are a big challenge for intrusion detection systems (IDSs), which may increase system burden, degrade system performance, and even cause the whole system collapse, when the number of incoming packets exceeds the maximum handling capability. To address this issue, packet...... filtration is considered as a promising solution, and our previous research efforts have proven that designing a trust-based packet filter was able to refine unwanted network packets and reduce the workload of a local IDS. With the development of Internet cooperation, collaborative intrusion detection...... compromised by insider attacks. In this paper, we adopt the existing CIDN framework and aim to apply a collaborative trust-based approach to reduce unwanted packets. More specifically, we develop a collaborative trust-based packet filter, which can be deployed in collaborative networks and be robust against...

  5. Specification of spatial identities of cerebellar neuron progenitors by ptf1a and atoh1 for proper production of GABAergic and glutamatergic neurons.

    Science.gov (United States)

    Yamada, Mayumi; Seto, Yusuke; Taya, Shinichiro; Owa, Tomoo; Inoue, Yukiko U; Inoue, Takayoshi; Kawaguchi, Yoshiya; Nabeshima, Yo-Ichi; Hoshino, Mikio

    2014-04-01

    In the cerebellum, the bHLH transcription factors Ptf1a and Atoh1 are expressed in distinct neuroepithelial regions, the ventricular zone (VZ) and the rhombic lip (RL), and are required for producing GABAergic and glutamatergic neurons, respectively. However, it is unclear whether Ptf1a or Atoh1 is sufficient for specifying GABAergic or glutamatergic neuronal fates. To test this, we generated two novel knock-in mouse lines, Ptf1a(Atoh1) and Atoh1(Ptf1a), that are designed to express Atoh1 and Ptf1a ectopically in the VZ and RL, respectively. In Ptf1a(Atoh1) embryos, ectopically Atoh1-expressing VZ cells produced glutamatergic neurons, including granule cells and deep cerebellar nuclei neurons. Correspondingly, in Atoh1(Ptf1a) animals, ectopically Ptf1a-expressing RL cells produced GABAergic populations, such as Purkinje cells and GABAergic interneurons. Consistent results were also obtained from in utero electroporation of Ptf1a or Atoh1 into embryonic cerebella, suggesting that Ptf1a and Atoh1 are essential and sufficient for GABAergic versus glutamatergic specification in the neuroepithelium. Furthermore, birthdating analyses with BrdU in the knock-in mice or with electroporation studies showed that ectopically produced fate-changed neuronal types were generated at temporal schedules closely simulating those of the wild-type RL and VZ, suggesting that the VZ and RL share common temporal information. Observations of knock-in brains as well as electroporated brains revealed that Ptf1a and Atoh1 mutually negatively regulate their expression, probably contributing to formation of non-overlapping neuroepithelial domains. These findings suggest that Ptf1a and Atoh1 specify spatial identities of cerebellar neuron progenitors in the neuroepithelium, leading to appropriate production of GABAergic and glutamatergic neurons, respectively.

  6. A new collaborative knowledge-based approach for wireless sensor networks.

    Science.gov (United States)

    Canada-Bago, Joaquin; Fernandez-Prieto, Jose Angel; Gadeo-Martos, Manuel Angel; Velasco, Juan Ramón

    2010-01-01

    This work presents a new approach for collaboration among sensors in Wireless Sensor Networks. These networks are composed of a large number of sensor nodes with constrained resources: limited computational capability, memory, power sources, etc. Nowadays, there is a growing interest in the integration of Soft Computing technologies into Wireless Sensor Networks. However, little attention has been paid to integrating Fuzzy Rule-Based Systems into collaborative Wireless Sensor Networks. The objective of this work is to design a collaborative knowledge-based network, in which each sensor executes an adapted Fuzzy Rule-Based System, which presents significant advantages such as: experts can define interpretable knowledge with uncertainty and imprecision, collaborative knowledge can be separated from control or modeling knowledge and the collaborative approach may support neighbor sensor failures and communication errors. As a real-world application of this approach, we demonstrate a collaborative modeling system for pests, in which an alarm about the development of olive tree fly is inferred. The results show that knowledge-based sensors are suitable for a wide range of applications and that the behavior of a knowledge-based sensor may be modified by inferences and knowledge of neighbor sensors in order to obtain a more accurate and reliable output.

  7. New Collaborative Filtering Algorithms Based on SVD++ and Differential Privacy

    Directory of Open Access Journals (Sweden)

    Zhengzheng Xian

    2017-01-01

    Full Text Available Collaborative filtering technology has been widely used in the recommender system, and its implementation is supported by the large amount of real and reliable user data from the big-data era. However, with the increase of the users’ information-security awareness, these data are reduced or the quality of the data becomes worse. Singular Value Decomposition (SVD is one of the common matrix factorization methods used in collaborative filtering, which introduces the bias information of users and items and is realized by using algebraic feature extraction. The derivative model SVD++ of SVD achieves better predictive accuracy due to the addition of implicit feedback information. Differential privacy is defined very strictly and can be proved, which has become an effective measure to solve the problem of attackers indirectly deducing the personal privacy information by using background knowledge. In this paper, differential privacy is applied to the SVD++ model through three approaches: gradient perturbation, objective-function perturbation, and output perturbation. Through theoretical derivation and experimental verification, the new algorithms proposed can better protect the privacy of the original data on the basis of ensuring the predictive accuracy. In addition, an effective scheme is given that can measure the privacy protection strength and predictive accuracy, and a reasonable range for selection of the differential privacy parameter is provided.

  8. Power and contestation in collaborative ecosystem-based management: The case of Haida Gwaii

    DEFF Research Database (Denmark)

    Takeda, Louise; Røpke, Inge

    2010-01-01

    of Haida Gwaii, and the provincial government’s attempt to ameliorate it through collaborative ecosystem-based land use planning. In contrast to previous studies that have tended to regard collaborative planning processes in terms of either an idealised win-win outcome or the unavoidable government co......-optation of opposition, this article explores both the problematic power relations found within the collaborative planning process as well as the opportunities presented by it to expand collective power and more effectively resist oppression and domination....

  9. Collaborative task planning for an internet based multi-operator multi-robot system

    Institute of Scientific and Technical Information of China (English)

    GAO Sheng; ZHAO Jie; CAI He-gao

    2005-01-01

    In an Internet based multi-operator and multi-robot system (IMOMR), operators have to work collaboratively to overcome the constraints of space and time. Inherently, the activities among them can be defined as a computer-supported cooperative work (CSCW). As a practical application of CSCW, a collaborative task planning system (CTPS) for IMOMR is proposed in this paper on the basis of Petri nets. Its definition, components design, and concrete implementation are given in detail, respectively. As a result, a clear collaboration mechanism of multiple operators in an IMOMR is obtained to guarantee their task planning.

  10. A web-based online collaboration platform for formulating engineering design projects

    Science.gov (United States)

    Varikuti, Sainath

    Effective communication and collaboration among students, faculty and industrial sponsors play a vital role while formulating and solving engineering design projects. With the advent in the web technology, online platforms and systems have been proposed to facilitate interactions and collaboration among different stakeholders in the context of senior design projects. However, there are noticeable gaps in the literature with respect to understanding the effects of online collaboration platforms for formulating engineering design projects. Most of the existing literature is focused on exploring the utility of online platforms on activities after the problem is defined and teams are formed. Also, there is a lack of mechanisms and tools to guide the project formation phase in senior design projects, which makes it challenging for students and faculty to collaboratively develop and refine project ideas and to establish appropriate teams. In this thesis a web-based online collaboration platform is designed and implemented to share, discuss and obtain feedback on project ideas and to facilitate collaboration among students and faculty prior to the start of the semester. The goal of this thesis is to understand the impact of an online collaboration platform for formulating engineering design projects, and how a web-based online collaboration platform affects the amount of interactions among stakeholders during the early phases of design process. A survey measuring the amount of interactions among students and faculty is administered. Initial findings show a marked improvement in the students' ability to share project ideas and form teams with other students and faculty. Students found the online platform simple to use. The suggestions for improving the tool generally included features that were not necessarily design specific, indicating that the underlying concept of this collaborative platform provides a strong basis and can be extended for future online platforms

  11. VizieR Online Data Catalog: Light curves of four transients from PTF & SNLS (Arcavi+, 2016)

    Science.gov (United States)

    Arcavi, I.; Wolf, W. M.; Howell, D. A.; Bildsten, L.; Leloudas, G.; Hardin, D.; Prajs, S.; Perley, D. A.; Svirski, G.; Gal-Yam, A.; Katz, B.; McCully, C.; Cenko, S. B.; Lidman, C.; Sullivan, M.; Valenti, S.; Astier, P.; Balland, C.; Carlberg, R. G.; Conley, A.; Fouchez, D.; Guy, J.; Pain, R.; Palanque-Delabrouille, N.; Perrett, K.; Pritchet, C. J.; Regnault, N.; Rich, J.; Ruhlmann-Kleider, V.

    2016-05-01

    PTF10iam was discovered by the Palomar 48 inch Oschin Schmidt telescope (P48) as part of the PTF survey. The three Supernova Legacy Survey (SNLS; Astier et al. 2006A&A...447...31A) events (SNLS04D4ec, SNLS05D2bk and SNLS06D1hc) were discovered by the deep survey of the Canada-France-Hawaii Telescope Legacy Survey (CFHTLS 2002), using the CFHT 3.6m telescope. The SNLS host-galaxy magnitudes were obtained from the SNLS five-year imaging data set (D. Hardin et al. 2016, in preparation), following the general method described in Kronborg et al. (2010A&A...514A..44K). In short, photometry was performed on deep image stacks in the ugriz CFHT/Megacam filters. (2 data files).

  12. The quality and impact of computer supported collaborative learning (CSCL) in radiology case-based learning.

    Science.gov (United States)

    Kourdioukova, Elena V; Verstraete, Koenraad L; Valcke, Martin

    2011-06-01

    The aim of this research was to explore (1) clinical years students' perceptions about radiology case-based learning within a computer supported collaborative learning (CSCL) setting, (2) an analysis of the collaborative learning process, and (3) the learning impact of collaborative work on the radiology cases. The first part of this study focuses on a more detailed analysis of a survey study about CSCL based case-based learning, set up in the context of a broader radiology curriculum innovation. The second part centers on a qualitative and quantitative analysis of 52 online collaborative learning discussions from 5th year and nearly graduating medical students. The collaborative work was based on 26 radiology cases regarding musculoskeletal radiology. The analysis of perceptions about collaborative learning on radiology cases reflects a rather neutral attitude that also does not differ significantly in students of different grade levels. Less advanced students are more positive about CSCL as compared to last year students. Outcome evaluation shows a significantly higher level of accuracy in identification of radiology key structures and in radiology diagnosis as well as in linking the radiological signs with available clinical information in nearly graduated students. No significant differences between different grade levels were found in accuracy of using medical terminology. Students appreciate computer supported collaborative learning settings when tackling radiology case-based learning. Scripted computer supported collaborative learning groups proved to be useful for both 5th and 7th year students in view of developing components of their radiology diagnostic approaches. Copyright © 2010 Elsevier Ireland Ltd. All rights reserved.

  13. A transformation approach for collaboration based requirement models

    CERN Document Server

    Harbouche, Ahmed; Mokhtari, Aicha

    2012-01-01

    Distributed software engineering is widely recognized as a complex task. Among the inherent complexities is the process of obtaining a system design from its global requirement specification. This paper deals with such transformation process and suggests an approach to derive the behavior of a given system components, in the form of distributed Finite State Machines, from the global system requirements, in the form of an augmented UML Activity Diagrams notation. The process of the suggested approach is summarized in three steps: the definition of the appropriate source Meta-Model (requirements Meta-Model), the definition of the target Design Meta-Model and the definition of the rules to govern the transformation during the derivation process. The derivation process transforms the global system requirements described as UML diagram activities (extended with collaborations) to system roles behaviors represented as UML finite state machines. The approach is implemented using Atlas Transformation Language (ATL).

  14. A TRANSFORMATION APPROACH FOR COLLABORATION BASED REQUIREMENT MODELS

    Directory of Open Access Journals (Sweden)

    Ahmed Harbouche

    2012-02-01

    Full Text Available Distributed software engineering is widely recognized as a complex task. Among the inherent complexitiesis the process of obtaining a system design from its global requirement specification. This paper deals withsuch transformation process and suggests an approach to derive the behavior of a given systemcomponents, in the form of distributed Finite State Machines, from the global system requirements, in theform of an augmented UML Activity Diagrams notation. The process of the suggested approach issummarized in three steps: the definition of the appropriate source Meta-Model (requirements Meta-Model, the definition of the target Design Meta-Model and the definition of the rules to govern thetransformation during the derivation process. The derivation process transforms the global systemrequirements described as UML diagram activities (extended with collaborations to system rolesbehaviors represented as UML finite state machines. The approach is implemented using AtlasTransformation Language (ATL.

  15. A Collaborative Network Model for Agrifood Transactions on Regional Base

    Science.gov (United States)

    Volpentesta, Antonio P.; Ammirato, Salvatore

    The paper deals with a collaborative agrifood network in a regional scenario where producers of high typical and quality goods and consumer groups are involved in agrifood transactions as well as information and knowledge exchanges through an e-business platform. While producers are engaged in providing consumers with useful and timely information about healthiness, environmentally friendliness and most importantly, food quality of their products, consumers are engaged in giving prompt and understandable feedbacks to the producers. In this sense, the network is a form of proactive learning community. Starting from some basic socio-economic assumptions on a reference territory, we present an organizational model that can be adopted to foster the development of the regional area where it is applied. An instantiation of the model for a selected territory (the District of High Quality Productions in Sibari, Calabria, Italy) and first results, coming from two pilot tests, have been summarized as well.

  16. Web-Based Modelling and Collaborative Simulation of Declarative Processes

    DEFF Research Database (Denmark)

    Slaats, Tijs; Marquard, Morten; Shahzad, Muhammad

    2015-01-01

    As a provider of Electronic Case Management solutions to knowledge-intensive businesses and organizations, the Danish company Exformatics has in recent years identified a need for flexible process support in the tools that we provide to our customers. We have addressed this need by adapting DCR......-user discussions on how knowledge workers really work, by enabling collaborative simulation of processes. In earlier work we reported on the integration of DCR Graphs as a workflow execution formalism in the existing Exformatics ECM products. In this paper we report on the advances we have made over the last two...... years, we describe the new declarative process modelling portal, discuss its features, describe the process of its development, report on the findings of an initial evaluation of the usability of the tool, resulting from a tutorial on declarative modelling with DCR Graphs that we organized at last years...

  17. Collaborative Drug Therapy Management: Case Studies of Three Community-Based Models of Care

    OpenAIRE

    Snyder, Margie E; Earl, Tara R.; Gilchrist, Siobhan; Greenberg, Michael; Heisler, Holly; Revels, Michelle; Matson-Koffman, Dyann

    2015-01-01

    Collaborative drug therapy management agreements are a strategy for expanding the role of pharmacists in team-based care with other providers. However, these agreements have not been widely implemented. This study describes the features of existing provider?pharmacist collaborative drug therapy management practices and identifies the facilitators and barriers to implementing such services in community settings. We conducted in-depth, qualitative interviews in 2012 in a federally qualified hea...

  18. A collaborative knowledge management framework for supply chains: A UML-based model approach

    Directory of Open Access Journals (Sweden)

    Jorge Esteban Hernández

    2008-12-01

    Full Text Available In the most general cases, collaborative activities imply a distributed decision-making process which involves several supply chain nodes. In this paper, by means of a literature review, and by also considering the deficiencies of existing proposals, a collaborative knowledge management UML-based framework supported is proposed. In addition, this proposal synthesizes existing knowledge, and it not only fulfils, but enriches, each component with the modeller’s own knowledge.

  19. On the teaching model of website-based collaborated self-directed study

    Science.gov (United States)

    Jing, Zhihua; Zeng, Yingxiong; Wen, Chunyu

    2011-12-01

    Based on the theory of collaborated self-directed study and the strengths of modern education technology, the study explores application of websites for collaborated self-directed college English learning. It introduces the characteristics and functions of the website developed to assist college English teaching in China. It also points out the problems currently existing among teachers and students, and puts forward some suggestions and strategies for the improvement of the application of the website.

  20. Electromechanical instrument collaborative sharing system based on A/S mode

    Institute of Scientific and Technical Information of China (English)

    ZHANG Ying; YANG Yu; XIE Qiu; YUAN Qianbin; LIU Fei

    2006-01-01

    In this paper, we put forward a collaborative mode based on A/S mode to solve existing problems in the process of developing electromechanical instrument collaborative sharing system (EICSS). The mode architecture, working pattern and development flow of this system were described. The prototype system developed was applied to Lambda 900 Spectrometer in Chongqing University to realize electromechanical instrument networked sharing, and demonstrated desirable expansibility and felxibility to satisfy diverse demands of customers.

  1. Supernova PTF 09UJ: A Possible Shock Breakout from a Dense Circumstellar Wind

    Science.gov (United States)

    Ofek, E. O.; Rabinak, I.; Neill, J. D.; Arcavi, I.; Cenko, S. B.; Waxman, E.; Kulkarni, S. R.; Gal-Yam, A.; Nugent, P. E.; Bildsten, L.; Bloom, J. S.; Filippenko, A. V.; Forster, K.; Howell, D. A.; Jacobsen, J.; Kasliwal, M. M.; Law, N.; Martin, C.; Poznanski, D.; Quimby, R. M.; Shen, K. J.; Sullivan, M.; Dekany, R.; Rahmer, G.; Hale, D.; Smith, R.; Zolkower, J.; Velur, V.; Walters, R.; Henning, J.; Bui, K.; McKenna, D.

    2010-12-01

    Type-IIn supernovae (SNe IIn), which are characterized by strong interaction of their ejecta with the surrounding circumstellar matter (CSM), provide a unique opportunity to study the mass-loss history of massive stars shortly before their explosive death. We present the discovery and follow-up observations of an SN IIn, PTF 09uj, detected by the Palomar Transient Factory (PTF). Serendipitous observations by Galaxy Evolution Explorer (GALEX) at ultraviolet (UV) wavelengths detected the rise of the SN light curve prior to the PTF discovery. The UV light curve of the SN rose fast, with a timescale of a few days, to a UV absolute AB magnitude of about -19.5. Modeling our observations, we suggest that the fast rise of the UV light curve is due to the breakout of the SN shock through the dense CSM (n ≈ 1010 cm-3). Furthermore, we find that prior to the explosion the progenitor went through a phase of high mass-loss rate (~0.1 M sun yr-1) that lasted for a few years. The decay rate of this SN was fast relative to that of other SNe IIn.

  2. Supernova PTF 09uj: A possible shock breakout from a dense circumstellar wind

    CERN Document Server

    Ofek, E O; Neill, J D; Arcavi, I; Cenko, S B; Waxman, E; Kulkarni, S R; Yam, A Gal; Nugent, P E; Bildsten, L; Bloom, J S; Filippenko, A V; Forster, K; Howell, D A; Jacobsen, J; Kasliwal, M M; Law, N; Martin, C; Poznanski, D; Quimby, R M; Shen, K J; Sullivan, M; Dekany, R; Rahmer, G; Hale, D; Smith, R; Zolkower, J; Velur, V; Walters, R; Henning, J; Bui, K; McKenna, D

    2010-01-01

    Type-IIn supernovae (SNe), which are characterized by strong interaction of their ejecta with the surrounding circumstellar matter (CSM), provide a unique opportunity to study the mass-loss history of massive stars shortly before their explosive death. We present the discovery and follow-up observations of a Type IIn SN, PTF 09uj, detected by the Palomar Transient Factory (PTF). Serendipitous observations by GALEX at ultraviolet (UV) wavelengths detected the rise of the SN light curve prior to the PTF discovery. The UV light curve of the SN rose fast, with a time scale of a few days, to a UV absolute AB magnitude of about -19.5. Modeling our observations, we suggest that the fast rise of the UV light curve is due to the breakout of the SN shock through the dense CSM (n~10^10 cm^-3). Furthermore, we find that prior to the explosion the progenitor went through a phase of high mass-loss rate (~0.1 solar mass per year) that lasted for a few years. The decay rate of this SN was fast relative to that of other SNe I...

  3. VizieR Online Data Catalog: Rotation periods of asteroids using iPTF (Chang+, 2016)

    Science.gov (United States)

    Chang, C.-K.; Lin, H.-W.; Ip, W.-H.; Prince, T. A.; Kulkarni, S. R.; Levitan, D.; Laher, R.; Surace, J.

    2017-01-01

    To explore the transient and variable sky synoptically, the PTF/iPTF employs the Palomar 48-inch Oschin Schmidt Telescope to create a field of view of ~7.26deg2 and a pixel scale of 1.01". The available filters include the Mould-R band, with which most exposures were taken, Gunn-g', and two different Hα-bands. The exposure time is fixed at 60 seconds, which can reach a median limiting magnitude of R~21mag at the 5σ level. In order to look for large super-fast rotators, we conducted five asteroid rotation-period surveys during 2014 October 29-31 and November 10-13, and 2015 January 18-19, February 20-21 and 25-26. Each survey continuously scanned six consecutive PTF fields over the ecliptic plane in the R-band, with a cadence of 10min. We ended up with a total sky coverage of ~188deg2. (3 data files).

  4. A Machine-learning Model to Separate Stars and Galaxies in iPTF Images

    Science.gov (United States)

    Miller, Adam; Kulkarni, Maya; Prince, Thomas A.; Intermediate Palomar Transient Factory

    2016-01-01

    The Intermediate Palomar Transient Factory (iPTF) is a dedicated time-domain survey optimized for the rapid characterization of fast transients. While significant efforts have been devoted to the development of software that quickly and reliably identifies new transients, there are currently no mechanisms to automatically classify these sources. The first component in deriving a classification is understanding whether or not the newly discovered transient is galactic or extragalactic in its origin. Here, we present our development of a new framework for classifying sources in iPTF reference images as either stars or galaxies. The framework utilizes the random forest algorithm and is trained with nearly 3 million sources that have Sloan Digital Sky Survey (SDSS) spectra. The final optimized model achieves a cross-validation accuracy of ~96%, which represents a significant improvement over the automated classification provided by the SExtractor algorithm. This accuracy, while slightly worse than that provided by the SDSS photometric classifier, can be extended over the entire iPTF footprint, which covers >5000 deg^2 that have not been imaged by SDSS. Associating transients with galactic or extragalactic origin is the first step in delivering automated classifications of newly discovered transients.

  5. Applying the ecological Shannon′s diversity index to measure research collaboration based on coauthorship: A pilot study

    Directory of Open Access Journals (Sweden)

    Ari Voutilainen

    2015-01-01

    Full Text Available The purpose of this study was to test the usefulness of a slightly modified Shannon's diversity index (H as a numerical measure of intragroup research collaboration diversity based on coauthorship. Altogether, 527 peer-reviewed scientific papers by two university departments were used as the study material. Nonrandom rationalized sampling was executed to enable the confirmation of the authors' affiliations. The smallest unit of collaboration, i.e., a pair of authors, was created by matching every author with each of the coauthors from the same department he or she collaborated with. H was calculated at the department level and compared with the previously published, coauthorship based measures of research collaboration: The collaborative index (CI, degree of collaboration (DC and collaboration diversity index (CDI. Obviously, H expressed a different aspect of research collaboration than the existing indexes. Compared to CI, DC, and CDI, H revealed novel aspects of collaboration when the abundance of collaboration increased and the distribution of collaborative relations between coauthors moved closer to the uniform distribution at the same time. H can provide additional information about collaborative relationships between researchers based on coauthorship, and it should be considered as a partial indicator of research collaboration.

  6. Progenitors of supernova Ibc: a single Wolf-Rayet star as the possible progenitor of the SN Ib iPTF13bvn

    CERN Document Server

    Groh, Jose H; Ekstrom, Sylvia

    2013-01-01

    Core-collapse supernova (SN) explosions mark the end of the tumultuous life of massive stars. Determining the nature of their progenitors is a crucial step towards understanding the properties of SNe. Until recently, no progenitor has been directly detected for SN of type Ibc, which are believed to come from massive stars that lose their Hydrogen envelope through stellar winds and from binary systems where the companion has stripped the H envelope from the primary. Here we analyze recently-reported observations of iPTF13bvn, which could possibly be the first detection of a SN Ib progenitor based on pre-explosion images. Very interestingly, the recently published Geneva models of single stars can reproduce the observed photometry of the progenitor candidate and its mass-loss rate, confirming the scenario from Cao et al 2013. We find that a single WR star with initial mass in the range 31-35 Msun fits the observed photometry of the progenitor of iPTF13bvn. The progenitor likely has a luminosity of log (L/Lsun)~...

  7. Probe on Network-based Collaborative Maintenance Model for After-sales Equipment

    Institute of Scientific and Technical Information of China (English)

    CHEN Xiaohui; SHENG Tianwen; YI Shuping

    2009-01-01

    In order to make equipment run safely, economically and continuously, some new maintenance models were put forward to improve the equipment after-sale maintenance service, such as E-maintenance, third-party maintenance, etc. To certain extent, the models solved the problem of the distance between the manufacturer and customer and the dispersion of the maintenance technologies, however, those resources are still widely distributed and do not collaborate efficiently. In this paper, a network-based collaborative maintenance service model was proposed for after-sales equipment to solve the problem of maintenance resources integration. Concretely, equipment designers, maintainers, spare parts suppliers and maintenance experts were grouped together to establish dynamic alliance. The leader of the alliance is the manufacturer under guaranty period or equipment user exceeding the guaranty period. The process of maintenance service was divided into three stages which are fault diagnosis, maintenance decision and maintenance implementation. The sub-alliances were established to carry out maintenance work at each stage. In addition, the business process of network-based collaborative maintenance was analyzed and collaborative business system for equipment's after-sales collaborative maintenance service was designed. In the end, an informational economics model of network-based collaborative maintenance was established to demonstrate the effectiveness of this maintenance model.

  8. Promoting the Role of Occupational Therapy in School-Based Collaboration: Outcome Project

    Science.gov (United States)

    Christner, Andrea

    2015-01-01

    This evidence-based project provided a professional development opportunity for educators to enhance the awareness of school-based occupational therapy and promote a collaborative approach when supporting student participation in daily learning tasks. Through asynchronous web-based delivery, participants viewed five narrated PowerPoint…

  9. Promoting the Role of Occupational Therapy in School-Based Collaboration: Outcome Project

    Science.gov (United States)

    Christner, Andrea

    2015-01-01

    This evidence-based project provided a professional development opportunity for educators to enhance the awareness of school-based occupational therapy and promote a collaborative approach when supporting student participation in daily learning tasks. Through asynchronous web-based delivery, participants viewed five narrated PowerPoint…

  10. A Supply Chain Architecture Based on Multi-agent Systems to Support Decentralized Collaborative Processes

    Science.gov (United States)

    Hernández, Jorge E.; Poler, Raúl; Mula, Josefa

    In a supply chain management context, the enterprise architecture concept to efficiently support the collaborative processes among the supply chain members involved has been evolving. Each supply chain has an organizational structure that describes the hierarchical relationships among its members, ranging from centralized to decentralized organizations. From a decentralized perspective, each supply chain member is able to identify collaborative and non collaborative partners and the kind of information to be exchanged to support negotiation processes. The same concepts of organizational structure and negotiation rules can be applied to a multi-agent system. This paper proposes a novel supply chain architecture to support decentralized collaborative processes in supply chains by considering a multi-agent-based system modeling approach.

  11. Industrial Internet of Things-Based Collaborative Sensing Intelligence: Framework and Research Challenges.

    Science.gov (United States)

    Chen, Yuanfang; Lee, Gyu Myoung; Shu, Lei; Crespi, Noel

    2016-02-06

    The development of an efficient and cost-effective solution to solve a complex problem (e.g., dynamic detection of toxic gases) is an important research issue in the industrial applications of the Internet of Things (IoT). An industrial intelligent ecosystem enables the collection of massive data from the various devices (e.g., sensor-embedded wireless devices) dynamically collaborating with humans. Effectively collaborative analytics based on the collected massive data from humans and devices is quite essential to improve the efficiency of industrial production/service. In this study, we propose a collaborative sensing intelligence (CSI) framework, combining collaborative intelligence and industrial sensing intelligence. The proposed CSI facilitates the cooperativity of analytics with integrating massive spatio-temporal data from different sources and time points. To deploy the CSI for achieving intelligent and efficient industrial production/service, the key challenges and open issues are discussed, as well.

  12. Industrial Internet of Things-Based Collaborative Sensing Intelligence: Framework and Research Challenges

    Directory of Open Access Journals (Sweden)

    Yuanfang Chen

    2016-02-01

    Full Text Available The development of an efficient and cost-effective solution to solve a complex problem (e.g., dynamic detection of toxic gases is an important research issue in the industrial applications of the Internet of Things (IoT. An industrial intelligent ecosystem enables the collection of massive data from the various devices (e.g., sensor-embedded wireless devices dynamically collaborating with humans. Effectively collaborative analytics based on the collected massive data from humans and devices is quite essential to improve the efficiency of industrial production/service. In this study, we propose a collaborative sensing intelligence (CSI framework, combining collaborative intelligence and industrial sensing intelligence. The proposed CSI facilitates the cooperativity of analytics with integrating massive spatio-temporal data from different sources and time points. To deploy the CSI for achieving intelligent and efficient industrial production/service, the key challenges and open issues are discussed, as well.

  13. Collaborating Filtering Community Image Recommendation System Based on Scene

    Directory of Open Access Journals (Sweden)

    He Tao

    2017-01-01

    Full Text Available With the advancement of smart city, the development of intelligent mobile terminal and wireless network, the traditional text information service no longer meet the needs of the community residents, community image service appeared as a new media service. “There are pictures of the truth” has become a community residents to understand and master the new dynamic community, image information service has become a new information service. However, there are two major problems in image information service. Firstly, the underlying eigenvalues extracted by current image feature extraction techniques are difficult for users to understand, and there is a semantic gap between the image content itself and the user’s understanding; secondly, in community life of the image data increasing quickly, it is difficult to find their own interested image data. Aiming at the two problems, this paper proposes a unified image semantic scene model to express the image content. On this basis, a collaborative filtering recommendation model of fusion scene semantics is proposed. In the recommendation model, a comprehensiveness and accuracy user interest model is proposed to improve the recommendation quality. The results of the present study have achieved good results in the pilot cities of Wenzhou and Yan'an, and it is applied normally.

  14. Collaborative Privacy - A Community-Based Privacy Infrastructure

    Science.gov (United States)

    Kolter, Jan; Kernchen, Thomas; Pernul, Günther

    The landscape of the World Wide Web with all its versatile services heavily relies on the disclosure of private user information. Service providers collecting more and more of these personal user data pose a growing privacy threat for users. Addressing user concerns privacy-enhancing technologies emerged. One goal of these technologies is to enable users to improve the control over their personal data. A famous representative is the PRIME project that aims for a holistic privacy-enhancing identity management system. However, approaches like the PRIME privacy architecture require service providers to change their server infrastructure and add specific privacy-enhancing components. In the near future, service providers are not expected to alter internal processes. In this paper, we introduce a collaborative privacy community that allows the open exchange of privacy-related information. We lay out the privacy community’s functions and potentials within a user-centric, provider-independent privacy architecture that will help foster the usage and acceptance of privacy-enhancing technologies.

  15. The Effectiveness of Pre-Service English Teachers’ Collaborative Genre-Based Writing Feedback

    Directory of Open Access Journals (Sweden)

    Didik Rinan Sumekto

    2017-05-01

    Full Text Available This study investigated the collaborative genre-based effectiveness among the pre-service English teachers (PSETs. Data collection used the genre-based writing feedback observation upon its reflection and instruction and need analysis questionnaire. The data analysis used multivariate statistics method to generalize the writing tests. The findings showed that the PSETs’ feedback supported the interaction, accountability, and interdependence. These aspects were due to the collaborative participation in groups, in which the PSETs worked with the flexibility, entirely performed the quality, andcontributed in positive attitude during the meetings and assignments. The feedback emphasized the learning improvement within the formative reflection through the general linear model (GLM repeated measures analysis, where F=6,114 and p<0,01. This study concludes that the collaborative genre-based writing feedback has the positive response from the PSETs. The determinant ranges gains in between 85% to 90% after a series of genre-based writing lectures were conducted.

  16. Effective collaborative learning in biomedical education using a web-based infrastructure.

    Science.gov (United States)

    Wu, Yunfeng; Zheng, Fang; Cai, Suxian; Xiang, Ning; Zhong, Zhangting; He, Jia; Xu, Fang

    2012-01-01

    This paper presents a feature-rich web-based system used for biomedical education at the undergraduate level. With the powerful groupware features provided by the wiki system, the instructors are able to establish a community-centered mentoring environment that capitalizes on local expertise to create a sense of online collaborative learning among students. The web-based infrastructure can help the instructors effectively organize and coordinate student research projects, and the groupware features may support the interactive activities, such as interpersonal communications and data sharing. The groupware features also provide the web-based system with a wide range of additional ways of organizing collaboratively developed materials, which makes it become an effective tool for online active learning. Students are able to learn the ability to work effectively in teams, with an improvement of project management, design collaboration, and technical writing skills. With the fruitful outcomes in recent years, it is positively thought that the web-based collaborative learning environment can perform an excellent shift away from the conventional instructor-centered teaching to community- centered collaborative learning in the undergraduate education.

  17. Implementation and application study on 3D collaborative design for CFETR based on ENOVIA VPM

    Energy Technology Data Exchange (ETDEWEB)

    Lin, Ling-Long, E-mail: linglonglin@ipp.ac.cn [Tokamak Design Division, Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031 (China); Song, Yun-Tao [Tokamak Design Division, Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031 (China); School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, Anhui 230026 (China); Tang, Yu-Xiang [Tokamak Design Division, Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031 (China); Du, Qing-Qing [Hefei Keju Cryogenics Co., Ltd., Hefei, Anhui 230031 (China); Gong, Yi-Peng [Shanghai ATOZ Group Co., Ltd., Shanghai 201611, P.R. China. (China)

    2015-11-15

    China Fusion Engineering Test Reactor (CFETR) is an ITER-like superconducting tokamak device and it is under conceptual design. The paper is to highlight the building of the collaborative platform and its application in design work. First, a collaborative framework between collaborators is proposed and a method based-on Riverbed to optimize WAN is adopted to improve the data transmission. Then it proposes a Unified Modeling Language (UML) approach for specification of PDM (Product Documents Management) system implementation to enable management of whole product data and related information about its entire lifecycle. At last, the chosen approach for modeling based on UML is detailed and the relational design based-on skeleton is instanced for CFETR.

  18. H.323 Based Collaborative Environment for High Energy and Nuclear Physics

    Institute of Scientific and Technical Information of China (English)

    TeijiNakamura; KiyoharuHashimoto; 等

    2001-01-01

    After having evaluated various H.323 products for these two years,KEK and Japanese HENP community started to move from ISDN(H.320)-based video conferencing environment into IP(H.323)-based one.Primary reason for the move is to cut down the ever increasing ISDN communication cost.At the same time the H.323 can offer us more powerful collaborative environment.In order to make KEK to be a center for the H.323-based collaborative environment in Japan,Picture Tel's LIVE GATEWAY as a H.320/H.323 gateway ,which is essential for the smooth transition,Cisco IP/VA 3510 as a H.323/MCU,and Cisco 2610 as a gatekeeper were installed at KEK in March 2001,And the transition started.In this paper,we'll describe the collaborative environment which our users can have,together with its operational results.

  19. A New Tool for Collaborative Video Search via Content-based Retrieval and Visual Inspection

    NARCIS (Netherlands)

    Hürst, W.O.; Ip Vai Ching, Algernon; Hudelist, Marco A.; Primus, Manfred J.; Schoeffmann, Klaus; Beecks, Chrisitan

    2016-01-01

    We present a new approach for collaborative video search and video browsing relying on a combination of traditional, indexbased video retrieval complemented with large-scale human-based visual inspection. In particular, a traditional PC interface is used for query-based search using advanced indexin

  20. A Collaborative Game-Based Learning Approach to Improving Students' Learning Performance in Science Courses

    Science.gov (United States)

    Sung, Han-Yu; Hwang, Gwo-Jen

    2013-01-01

    In this study, a collaborative game-based learning environment is developed by integrating a grid-based Mindtool to facilitate the students to share and organize what they have learned during the game-playing process. To evaluate the effectiveness of the proposed approach, an experiment has been conducted in an elementary school natural science…

  1. Building Evaluation of Collaborative Learning into a WWW-Based Course: Pedagogical and Technical Experiences.

    Science.gov (United States)

    Collis, Betty

    1998-01-01

    A first-year course in the computer-based educational media design curriculum at the University of Twente (Netherlands) uses the World Wide Web as an integrated course environment; collaborative group-based learning is the basis of the instruction. The Web is used to make evaluation-oriented activities part of the ongoing student experience.…

  2. Development of web-based collaborative framework for the simulation of embedded systems

    Directory of Open Access Journals (Sweden)

    Woong Yang

    2016-10-01

    In this study, It has been developed a Web-based collaboration framework which can be a flexible connection between macroscopically virtual environment and the physical environment. This framework is able to verifiy and manage physical environments. Also it can resolve the bottlenecks encountered during the base expansion and development process of IoT (Internet of Things environment.

  3. iPTF13beo: The Double-Peaked Light Curve of a Type Ibn Supernova Discovered Shortly after Explosion

    CERN Document Server

    Gorbikov, Evgeny; Ofek, Eran O; Vreeswijk, Paul M; Nugent, Peter E; Chotard, Nicolas; Kulkarni, Shrinivas R; Cao, Yi; De Cia, Annalisa; Yaron, Ofer; Tal, David; Arcavi, Iair; Kasliwal, Mansi M; Cenko, S Bradley; Sullivan, Mark

    2013-01-01

    We present optical photometric and spectroscopic observations of the Type Ibn (SN 2006jc-like) supernova iPTF13beo. Detected by the intermediate Palomar Transient Factory on 2013 May 19.39, ~3 hours after the estimated explosion time, iPTF13beo is the youngest and the most distant (430 Mpc) Type Ibn event ever observed. Type Ibn events are rare, and their early evolution, both photometric and spectroscopic, has not been studied yet. The iPTF13beo light curve is consistent with light curves of other Type Ibn SNe and with light curves of fast Type Ic events, but with a slightly faster rise-time of two days. In addition, the iPTF13beo light curve exhibits a double-peak structure separated by 9 days, not observed before in any Type Ibn SN. Low-resolution spectra were obtained during the two peaks of the iPTF13beo light curve. The spectrum taken during the rising stage (2.4 days after the estimated explosion time) is featureless and similar to early spectra of SNe Ic-BL. The spectrum obtained during the declining ...

  4. PTF10ops - a subluminous, normal-width lightcurve Type Ia supernova in the middle of nowhere

    CERN Document Server

    Maguire, Kate; Thomas, Rollin C; Nugent, Peter E; Howell, D Andrew; Gal-Yam, Avishay; Arcavi, Iair; Ben-Ami, Sagi; Blake, Sarah; Botyanszki, Janos; Buton, Clement; Cooke, Jeffery; Ellis, Richard S; Hook, Isobel M; Kasliwal, Mansi M; Pan, Yen-Chen; Pereira, Rui; Podsiadlowski, Philipp; Sternberg, Assaf; Suzuki, Nao; Xu, Dong; Yaron, Ofer; Bloom, Joshua S; Cenko, S Bradley; Kulkarni, Shrinivas R; Law, Nicholas; Ofek, Eran O; Poznanski, Dovi; Quimby, Robert M

    2011-01-01

    PTF10ops is a Type Ia supernova (SN Ia), whose lightcurve and spectral properties place it outside the current SN Ia subtype classifications. Its spectra display the characteristic lines of subluminous SNe Ia, but it has a normal-width lightcurve with a long rise-time, typical of normal luminosity SNe Ia. The early-time optical spectra of PTF10ops were modelled using a spectral fitting code and found to have all the lines typically seen in subluminous SNe Ia, without the need to invoke more uncommon elements. The host galaxy environment of PTF10ops is also unusual with no galaxy detected at the position of the SN down to an absolute limiting magnitude of r \\geq -12.0 mag, but a very massive galaxy is present at a separation of ~148 kpc and at the same redshift as suggested by the SN spectral features. The progenitor of PTF10ops is most likely a very old star, possibly in a low metallicity environment, which affects its explosion mechanism and observational characteristics. PTF10ops does not easily fit into an...

  5. VizieR Online Data Catalog: PTF obs. of a precursor to SNHunt 275 2015 May event (Ofek+, 2016)

    Science.gov (United States)

    Ofek, E. O.; Cenko, S. B.; Shaviv, N. J.; Duggan, G.; Strotjohann, N.-L.; Rubin, A.; Kulkarni, S. R.; Gal-Yam, A.; Sullivan, M.; Cao, Y.; Nugent, P. E.; Kasliwal, M. M.; Sollerman, J.; Fransson, C.; Filippenko, A. V.; Perley, D. A.; Yaron, O.; Laher, R.

    2016-08-01

    The Palomar Transient Factory (PTF and iPTF; Law et al. 2009PASP..121.1395L; Rau et al. 2009PASP..121.1334R), using the 48inch Oschin Schmidt telescope, observed the field of SNHunt 275 starting in 2009 March. On 2013 December 12, PTF detected a new source at the location of the event, and the transient was named PTF 13efv (see Figure 1). Three images obtained between 2014 January 23 and April 25 were used as a reference. The PTF R-band photometry is listed in Table1. Most of the optical spectra were obtained with the Low Resolution Imaging Spectrometer (LRIS) on the Keck I 10m telescope, although a few spectra were also taken with the DEep Imaging Multi-Object Spectrograph (DEIMOS) on the Keck II 10m telescope, the Kast spectrograph on the Shane 3m telescope at Lick Observatory, and the Gemini-North Multiobject Spectrograph (GMOS) on the 8m Gemini-N telescope. The first spectrum was obtained during the 2013 December outburst. We used the Swift/UVOT observations of SNHunt 275, since 2008, to construct the bolometric light curve of the transient. The log of Swift-XRT observations, along with the source and background X-ray counts in the individual observations, is given in Table 5. (3 data files).

  6. The role of collaborations in sustaining an evidence-based intervention to reduce child neglect.

    Science.gov (United States)

    Green, Amy E; Trott, Elise; Willging, Cathleen E; Finn, Natalie K; Ehrhart, Mark G; Aarons, Gregory A

    2016-03-01

    Child neglect is the most prevalent form of child maltreatment and represents 79.5% of open child-welfare cases. A recent study found the evidence-based intervention (EBI) SafeCare(®) (SC) to significantly reduce child neglect recidivism rates. To fully capitalize on the effectiveness of such EBIs, service systems must engage in successful implementation and sustainment; however, little is known regarding what factors influence EBI sustainment. Collaborations among stakeholders are suggested as a means for facilitating EBI implementation and sustainment. This study combines descriptive quantitative survey data with qualitative interview and focus group findings to examine the role of collaboration within the context of public-private partnerships in 11 child welfare systems implementing SC. Participants included administrators of government child welfare systems and community-based organizations, as well as supervisors, coaches, and home visitors of the SC program. Sites were classified as fully-, partially-, and non-sustaining based on implementation fidelity. One-way analysis of variance was used to examine differences in stakeholder reported Effective Collaboration scores across fully-sustaining, partially-sustaining, and non-sustaining sites. Qualitative transcripts were analyzed via open and focused coding to identify the commonality, diversity, and complexity of collaborations involved in implementing and sustaining SC. Fully-sustaining sites reported significantly greater levels of effective collaboration than non-sustaining sites. Key themes described by SC stakeholders included shared vision, building on existing relationships, academic support, problem solving and resource sharing, and maintaining collaborations over time. Both quantitative and qualitative results converge in highlighting the importance of effective collaboration in EBI sustainment in child welfare service systems.

  7. The EDIE method – towards an approach to collaboration-based persuasive design

    DEFF Research Database (Denmark)

    Hansen, Sandra Burri Gram

    2016-01-01

    This paper presents the initial steps towards a collaboration-based method for persuasive design – the EDIE method (Explore, Design, Implement, Evaluate). The method is inspired by Design-Based Research, but developed to combine different design approaches that have dominated the persuasive...... technology field over the past decade. The rhetorical notion of Kairos is considered a key element in the EDIE method, resulting in a distinct focus on participatory design and constructive ethics. The method is explained through a practical example of developing persuasive learning designs in collaboration...

  8. Sharik 1.0: User Needs and System Requirements for a Web-Based Tool to Support Collaborative Sensemaking

    Science.gov (United States)

    2016-05-01

    Sharik 1.0: User Needs and System Requirements for a Web -Based Tool to Support Collaborative Sensemaking Shadi Ghajar-Khosravi...Conclusion A web -based collaborative sensemaking system is proposed to support the user tasks involved in the Intelligence Cycle of Canadian Forces...parentheses after the title.) Sharik 1.0: User Needs and System Requirements for a Web -Based Tool to Support Collaborative Sensemaking 4

  9. Concept analysis of collaboration in implementing problem-based learning in nursing education

    Directory of Open Access Journals (Sweden)

    Mahlasela A. Rakhudu

    2016-02-01

    Full Text Available Objectives: The purpose of this concept analysis was to better understand and define collaboration as it relates to the implementation of problem-based learning (PBL.Methods: The process of concept analysis was conducted in three phases; namely, theoretical or literature review, empirical or fieldwork; and analysis phases. Rodgers’ evolutionary approach was used to clarify the attributes, antecedents, surrogate, related terms and consequences of collaboration in implementing PBL. The search key terms were ‘collaboration’, ‘problem-based learning’, ‘nursing’ and ‘nursing education’. The search was performed in the Cumulative Index to Nursing and Allied Health Literature (CINAHL, Medline and PsycINFO databases. The articles were reviewed for trends that would reflect the current knowledge for collaboration as a concept. Descriptive qualitative study was used to collect data purposively from participants of three universities offering PBL in Republic of South Africa and three hospitals where PBL students are placed.Results: Collaboration in implementing PBL is described as using the following terms: interpersonal, interactive and personal process, shared goal and governance. The antecedents of collaboration include commitment and support; common goal; formal agreement; training and development; and monitoring and evaluation of tools and mechanisms. Consequences of collaboration in implementing PBL are as follows: information, resource and expertise sharing; personal development and mentoring; creation of supportive and nurturing environment; professional socialisation; improved students’ outcomes; and effective utilisation of resources.Conclusion: Effective collaboration within nursing education and with other healthcare professionals to achieve quality outcomes in an increasingly interdependent higher education system continues to grow in importance.

  10. Project-based learning with international collaboration for training biomedical engineers.

    Science.gov (United States)

    Krishnan, Shankar

    2011-01-01

    Training biomedical engineers while effectively keeping up with the fast paced scientific breakthroughs and the growth in technical innovations poses arduous challenges for educators. Traditional pedagogical methods are employed for coping with the increasing demands in biomedical engineering (BME) training and continuous improvements have been attempted with some success. Project-based learning (PBL) is an academic effort that challenges students by making them carry out interdisciplinary projects aimed at accomplishing a wide range of student learning outcomes. PBL has been shown to be effective in the medical field and has been adopted by other fields including engineering. The impact of globalization in healthcare appears to be steadily increasing which necessitates the inclusion of awareness of relevant international activities in the curriculum. Numerous difficulties are encountered when the formation of a collaborative team is tried, and additional difficulties occur as the collaboration team is extended to international partners. Understanding and agreement of responsibilities becomes somewhat complex and hence the collaborative project has to be planned and executed with clear understanding by all partners and participants. A model for training BME students by adopting PBL with international collaboration is proposed. The results of previous BME project work with international collaboration fit partially into the model. There were many logistic issues and constraints; however, the collaborative projects themselves greatly enhanced the student learning outcomes. This PBL type of learning experience tends to promote long term retention of multidisciplinary material and foster high-order cognitive activities such as analysis, synthesis and evaluation. In addition to introducing the students to experiences encountered in the real-life workforce, the proposed approach enhances developing professional contracts and global networking. In conclusion, despite

  11. Collaborative drug therapy management: case studies of three community-based models of care.

    Science.gov (United States)

    Snyder, Margie E; Earl, Tara R; Gilchrist, Siobhan; Greenberg, Michael; Heisler, Holly; Revels, Michelle; Matson-Koffman, Dyann

    2015-03-26

    Collaborative drug therapy management agreements are a strategy for expanding the role of pharmacists in team-based care with other providers. However, these agreements have not been widely implemented. This study describes the features of existing provider-pharmacist collaborative drug therapy management practices and identifies the facilitators and barriers to implementing such services in community settings. We conducted in-depth, qualitative interviews in 2012 in a federally qualified health center, an independent pharmacy, and a retail pharmacy chain. Facilitators included 1) ensuring pharmacists were adequately trained; 2) obtaining stakeholder (eg, physician) buy-in; and 3) leveraging academic partners. Barriers included 1) lack of pharmacist compensation; 2) hesitation among providers to trust pharmacists; 3) lack of time and resources; and 4) existing informal collaborations that resulted in reduced interest in formal agreements. The models described in this study could be used to strengthen clinical-community linkages through team-based care, particularly for chronic disease prevention and management.

  12. Design And Efficient Deployment Of Honeypot And Dynamic Rule Based Live Network Intrusion Collaborative System

    Directory of Open Access Journals (Sweden)

    Renuka Prasad.B

    2011-03-01

    Full Text Available The continuously emerging, operationally and managerially independent, geographically distributedcomputer networks deployable in an evolutionarily manner have created greater challenges in securingthem. Several research works and experiments have convinced the security expert that Network IntrusionDetection Systems (NIDS or Network Intrusion Prevention Systems (NIPS alone are not capable ofsecuring the Computer Networks from internal and external threats completely. In this paper we presentthe design of Intrusion Collaborative System which is a combination of NIDS,NIPS, Honeypots, softwaretools like nmap, iptables etc. Our Design is tested against existing attacks based on Snort Rules andseveral customized DDOS , remote and guest attacks. Dynamic rules are generated during every unusualbehavior that helps Intrusion Collaborative System to continuously learn about new attacks. Also aformal approach to deploy Live Intrusion Collaboration Systems based on System of Systems Concept isProposed.

  13. A Social Contract for University-Industry Collaboration: A Case of Project-Based Learning Environment

    Science.gov (United States)

    Vartiainen, Tero

    This study determines a social contract for a form of university-industry collaboration to a project-based learning environment in close collaboration with industry. The author's previous studies on moral conflicts in a project-based learning (PjBL) environment and his 5-year engagement in the PjBL environment are used as background knowledge, and John Rawls' veil of ignorance is used as a method in the contract formulation. Fair and impartial treatment of actors is strived for with the contract which constitutes of sets of obligations for each party, students, clients, and university (instructors) in the chosen project course. With the contract fair and impartial treatment of actors is strived for and the most dilemmatic moral conflicts are tried to be avoided. The forming of the social contract is evaluated, and implications for research and collaborations in practice are offered.

  14. Cloud Services for Collaborative Web Based Project Management System

    Directory of Open Access Journals (Sweden)

    Chetan Yuvraj Dhembre

    2011-11-01

    Full Text Available Cloud computing is a style of computing which is having dynamically scalable virtualized resources provided as a service over the Internet. In this paper we are presenting project management system (PMS based on cloud computing. Lack of manageability and variant projects scope are two of the worst problems plaguing IT organizations today. Not only these problems can be costly, they can be deadly to business objectives. To compete, we need to take out uncertainty with technologies that improve definition, purpose, and scope. This cloud based project management system provides solution for these problems. This system is based on agile software development lifecycle on cloud. The cloud based PMS will give you greater real-time insight in project requirements, and the inevitable changes of the scope that cross the boundaries of the distributed teams.

  15. Building Collaboration through Project-Based Theater Design

    Science.gov (United States)

    Basarab, Heather

    2012-01-01

    With the economic collapse of 2008, there has been a dramatic increase in government emphasis on the value of science and technology-based study in the nation's high schools as a means for the United States to remain competitive in the world economic market. Financial, political and societal support for the hard sciences, coupled with…

  16. The concept of flow in collaborative game-based learning

    NARCIS (Netherlands)

    Admiraal, W.; Huizenga, J.; Akkerman, S.; ten Dam, G.

    2011-01-01

    Generally, high-school students have been characterized as bored and disengaged from the learning process. However, certain educational designs promote excitement and engagement. Game-based learning is assumed to be such a design. In this study, the concept of flow is used as a framework to investig

  17. iPTF13bvn: The first evidence of a binary progenitor for a type Ib supernova

    Energy Technology Data Exchange (ETDEWEB)

    Bersten, Melina C.; Folatelli, Gastón; Nomoto, Ken' ichi; Quimby, Robert [Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583 (Japan); Benvenuto, Omar G. [Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque S/N, B1900FWA La Plata (Argentina); Kuncarayakti, Hanindyo [Millennium Institute of Astrophysics, Casilla 36-D, Santiago (Chile); Srivastav, Shubham; Anupama, G. C.; Sahu, Devendra K., E-mail: melina.bersten@ipmu.jp [Indian Institute of Astrophysics, Koramangala, Bangalore 560034 (India)

    2014-10-01

    The recent detection in archival Hubble Space Telescope images of an object at the location of supernova (SN) iPTF13bvn may represent the first direct evidence of the progenitor of a Type Ib SN. The object's photometry was found to be compatible with a Wolf-Rayet pre-SN star mass of ≈11 M {sub ☉}. However, based on hydrodynamical models, we show that the progenitor had a pre-SN mass of ≈3.5 M {sub ☉} and that it could not be larger than ≈8 M {sub ☉}. We propose an interacting binary system as the SN progenitor and perform evolutionary calculations that are able to self-consistently explain the light curve shape, the absence of hydrogen, and the pre-SN photometry. We further discuss the range of allowed binary systems and predict that the remaining companion is a luminous O-type star of significantly lower flux in the optical than the pre-SN object. A future detection of such a star may be possible and would provide the first robust identification of a progenitor system for a Type Ib SN.

  18. The detection rate of early UV emission from supernovae: A dedicated GALEX/PTF survey and calibrated theoretical estimates

    CERN Document Server

    Ganot, Noam; Ofek, Eran O; Sagiv, Ilan; Waxman, Eli; Lapid, Ofer; Kulkarni, Shrinivas R; Ben-Ami, Sagi; Kasliwal, Mansi M; Chelouche, Doron; Rafter, Stephen; Behar, Ehud; Laor, Ari; Poznanski, Dovi; Nakar, Udi; Maoz, Dan; Trakhtenbrot, Benny; Neill, James D; Barlow, Thomas A; Martin, Christofer D; Gezari, Suvi; Arcavi, Iair; Bloom, Joshua s; Nugent, Peter E; Sullivan, Mark

    2014-01-01

    The radius and surface composition of an exploding massive star, as well as the explosion energy per unit mass, can be measured using early UV observations of core collapse supernovae (SNe). We present the first results from a simultaneous GALEX/PTF search for early UV emission from SNe. Six Type II SNe and one Type II superluminous SN (SLSN-II) are clearly detected in the GALEX NUV data. We compare our detection rate with theoretical estimates based on early, shock-cooling UV light curves calculated from models that fit existing Swift and GALEX observations well, combined with volumetric SN rates. We find that our observations are in good agreement with calculated rates assuming that red supergiants (RSGs) explode with fiducial radii of 500 R_solar, explosion energies of 10^51 erg, and ejecta masses of 10 M_solar. Exploding blue supergiants and Wolf-Rayet stars are poorly constrained. We describe how such observations can be used to derive the progenitor radius, surface composition and explosion energy per u...

  19. Ascl1 as a novel player in the Ptf1a transcriptional network for GABAergic cell specification in the retina.

    Science.gov (United States)

    Mazurier, Nicolas; Parain, Karine; Parlier, Damien; Pretto, Silvia; Hamdache, Johanna; Vernier, Philippe; Locker, Morgane; Bellefroid, Eric; Perron, Muriel

    2014-01-01

    In contrast with the wealth of data involving bHLH and homeodomain transcription factors in retinal cell type determination, the molecular bases underlying neurotransmitter subtype specification is far less understood. Using both gain and loss of function analyses in Xenopus, we investigated the putative implication of the bHLH factor Ascl1 in this process. We found that in addition to its previously characterized proneural function, Ascl1 also contributes to the specification of the GABAergic phenotype. We showed that it is necessary for retinal GABAergic cell genesis and sufficient in overexpression experiments to bias a subset of retinal precursor cells towards a GABAergic fate. We also analysed the relationships between Ascl1 and a set of other bHLH factors using an in vivo ectopic neurogenic assay. We demonstrated that Ascl1 has unique features as a GABAergic inducer and is epistatic over factors endowed with glutamatergic potentialities such as Neurog2, NeuroD1 or Atoh7. This functional specificity is conferred by the basic DNA binding domain of Ascl1 and involves a specific genetic network, distinct from that underlying its previously demonstrated effects on catecholaminergic differentiation. Our data show that GABAergic inducing activity of Ascl1 requires the direct transcriptional regulation of Ptf1a, providing therefore a new piece of the network governing neurotransmitter subtype specification during retinogenesis.

  20. iPTF 13bvn: The First Evidence of a Binary Progenitor for a Type Ib Supernova

    CERN Document Server

    Bersten, Melina C; Folatelli, Gaston; Nomoto, Ken'ichi; Kuncarayakti, Hanindyo; Srivastav, Shubham; Anupama, G C; Quimby, Robert; Sahu, Devendra K

    2014-01-01

    The recent detection in archival HST images of an object at the the location of supernova (SN) iPTF~13bvn may represent the first direct evidence of the progenitor of a Type~Ib SN. The object's photometry was found to be compatible with a Wolf-Rayet pre-SN star mass of ~11 Msun. However, based on hydrodynamical models we show that the progenitor had a pre-SN mass of ~3.5 Msun and that it could not be larger than ~8 Msun. We propose an interacting binary system as the SN progenitor and perform evolutionary calculations that are able to self-consistently explain the light-curve shape, the absence of hydrogen, and the pre-SN photometry. We further discuss the range of allowed binary systems and predict that the remaining companion is a luminous O-type star of significantly lower flux in the optical than the pre-SN object. A future detection of such star may be possible and would provide the first robust progenitor identification for a Type-Ib SN.

  1. Ascl1 as a novel player in the Ptf1a transcriptional network for GABAergic cell specification in the retina.

    Directory of Open Access Journals (Sweden)

    Nicolas Mazurier

    Full Text Available In contrast with the wealth of data involving bHLH and homeodomain transcription factors in retinal cell type determination, the molecular bases underlying neurotransmitter subtype specification is far less understood. Using both gain and loss of function analyses in Xenopus, we investigated the putative implication of the bHLH factor Ascl1 in this process. We found that in addition to its previously characterized proneural function, Ascl1 also contributes to the specification of the GABAergic phenotype. We showed that it is necessary for retinal GABAergic cell genesis and sufficient in overexpression experiments to bias a subset of retinal precursor cells towards a GABAergic fate. We also analysed the relationships between Ascl1 and a set of other bHLH factors using an in vivo ectopic neurogenic assay. We demonstrated that Ascl1 has unique features as a GABAergic inducer and is epistatic over factors endowed with glutamatergic potentialities such as Neurog2, NeuroD1 or Atoh7. This functional specificity is conferred by the basic DNA binding domain of Ascl1 and involves a specific genetic network, distinct from that underlying its previously demonstrated effects on catecholaminergic differentiation. Our data show that GABAergic inducing activity of Ascl1 requires the direct transcriptional regulation of Ptf1a, providing therefore a new piece of the network governing neurotransmitter subtype specification during retinogenesis.

  2. DISCOVERY, PROGENITOR AND EARLY EVOLUTION OF A STRIPPED ENVELOPE SUPERNOVA iPTF13bvn

    Energy Technology Data Exchange (ETDEWEB)

    Cao, Yi; Horesh, Assaf; Kulkarni, S. R. [Astronomy Department, California Institute of Technology, 1200 E. California Boulevard, Pasadena, CA 91125 (United States); Kasliwal, Mansi M. [The Observatories, Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101 (United States); Arcavi, Iair; Gal-Yam, Avishay; Gorbikov, Evgeny; Ofek, Eran O.; Yaron, Ofer [Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 76100 (Israel); Hancock, Paul [Sydney Institute for Astronomy (SIfA), School of Physics, The University of Sydney, NSW 2006 (Australia); Valenti, Stefano; Graham, Melissa; Howell, D. Andrew [Las Cumbres Observatory Global Telescope Network, Goleta, CA 93117 (United States); Cenko, S. Bradley [Astrophysics Science Division, NASA Goddard Space Flight Center, Mail Code 661, Greenbelt, MD 20771 (United States); Sand, David [Department of Physics, Texas Tech University, Lubbock, TX 79409 (United States); Silverman, Jeffrey M.; Wheeler, J. Craig; Marion, G. H. [Department of Astronomy, University of Texas at Austin, Austin, TX 78712 (United States); Walker, Emma S. [Department of Physics, Yale University, New Haven, CT 06511-8499 (United States); Mazzali, Paolo, E-mail: ycao@astro.caltech.edu [INAF-Padova Astronomical Observatory, Vicolo dell' Osservatorio 5, I-35122 Padova (Italy); and others

    2013-09-20

    The intermediate Palomar Transient Factory reports our discovery of a young supernova, iPTF13bvn, in the nearby galaxy, NGC 5806 (22.5 Mpc). Our spectral sequence in the optical and infrared suggests a Type Ib classification. We identify a blue progenitor candidate in deep pre-explosion imaging within a 2σ error circle of 80 mas (8.7 pc). The candidate has an M{sub B} luminosity of –5.52 ± 0.39 mag and a B – I color of 0.25 ± 0.25 mag. If confirmed by future observations, this would be the first direct detection for a progenitor of a Type Ib. Fitting a power law to the early light curve, we find an extrapolated explosion date around 0.6 days before our first detection. We see no evidence of shock cooling. The pre-explosion detection limits constrain the radius of the progenitor to be smaller than a few solar radii. iPTF13bvn is also detected in centimeter and millimeter wavelengths. Fitting a synchrotron self-absorption model to our radio data, we find a mass-loading parameter of 1.3×10{sup 12} g cm{sup –1}. Assuming a wind velocity of 10{sup 3} km s{sup –1}, we derive a progenitor mass-loss rate of 3 × 10{sup –5} M {sub ☉} yr{sup –1}. Our observations, taken as a whole, are consistent with a Wolf-Rayet progenitor of the supernova iPTF13bvn.

  3. Feedback-Based Collaborative Secrecy Encoding over Binary Symmetric Channels

    CERN Document Server

    Amariucai, George

    2009-01-01

    In this paper we propose a feedback scheme for transmitting secret messages between two legitimate parties, over an eavesdropped communication link. Relative to Wyner's traditional encoding scheme \\cite{wyner1}, our feedback-based encoding often yields larger rate-equivocation regions and achievable secrecy rates. More importantly, by exploiting the channel randomness inherent in the feedback channels, our scheme achieves a strictly positive secrecy rate even when the eavesdropper's channel is less noisy than the legitimate receiver's channel. All channels are modeled as binary and symmetric (BSC). We demonstrate the versatility of our feedback-based encoding method by using it in three different configurations: the stand-alone configuration, the mixed configuration (when it combines with Wyner's scheme \\cite{wyner1}), and the reversed configuration. Depending on the channel conditions, significant improvements over Wyner's secrecy capacity can be observed in all configurations.

  4. Project-based Collaborative learning in distance education

    DEFF Research Database (Denmark)

    Knudsen, Morten; Bajard, Christine; Helbo, Jan

    2004-01-01

    This article describes the experiences drawn from an experiment in transferring positive experience with a project-organised on-campus engineering programme to a technology supported distance education programme. Three years of experience with the Master of Industrial Information Technology (MII......, didactic adjustments have been made based on feedback, in particular from evaluation questionnaires. This process has been very constructive in approaching the goal: a successful model for project organized learning in distance education....

  5. An evidence-based systematic review of kratom (Mitragyna speciosa) by the Natural Standard Research Collaboration.

    Science.gov (United States)

    Ulbricht, Catherine; Costa, Dawn; Dao, Julie; Isaac, Richard; LeBlanc, Yvonne C; Rhoades, Jenna; Windsor, Regina C

    2013-06-01

    An evidence-based systematic review of kratom (Mitragyna speciosa) by the Natural Standard Research Collaboration consolidates the safety and efficacy data available in the scientific literature using a validated, reproducible grading rationale. This article includes written and statistical analysis of clinical trials, plus a compilation of expert opinion, folkloric precedent, history, pharmacology, kinetics/dynamics, interactions, adverse effects, toxicology, and dosing.

  6. Scaffolding Information Problem Solving in Web-Based Collaborative Inquiry Learning

    Science.gov (United States)

    Raes, Annelies; Schellens, Tammy; De Wever, Bram; Vanderhoven, Ellen

    2012-01-01

    This study investigated the impact of different modes of scaffolding on students who are learning science through a web-based collaborative inquiry project in authentic classroom settings and explored the interaction effects with students' characteristics. The intervention study aimed to improve "domain-specific knowledge" and "metacognitive…

  7. The Value of Picture-Book Reading-Based Collaborative Output Activities for Vocabulary Retention

    Science.gov (United States)

    Sun, Chia-Ho

    2017-01-01

    This study investigated the effects of three instructional modes: picture-book reading-only (PRO), picture-book reading plus vocabulary instruction (PRVI), and picture-book reading plus reading-based collaborative output activity (PRCOA) on young adult EFL (English as a foreign language) learners' vocabulary acquisition and retention. Eighty…

  8. Evaluating Assessment Strategies through Collaborative Evidence-Based Practice: Can One Tool Fit All?

    Science.gov (United States)

    McDowell, Liz; Smailes, Joanne; Sambell, Kay; Sambell, Alistair; Wakelin, Delia

    2008-01-01

    This paper reports on a collaborative project to improve assessment undertaken by a cross-discipline group of university lecturers (Business, Engineering and Psychology) using action research methodology. First-stage analysis was based on results from an Assessment Experience Questionnaire developed by the FAST FDTL4 (Formative Assessment in…

  9. Improving Collaborative Learning in the Classroom: Text Mining Based Grouping and Representing

    Science.gov (United States)

    Erkens, Melanie; Bodemer, Daniel; Hoppe, H. Ulrich

    2016-01-01

    Orchestrating collaborative learning in the classroom involves tasks such as forming learning groups with heterogeneous knowledge and making learners aware of the knowledge differences. However, gathering information on which the formation of appropriate groups and the creation of graphical knowledge representations can be based is very effortful…

  10. The Comparative Effect of Individually-Constructed vs. Collaboratively-Constructed Computer-Based Concept Maps

    Science.gov (United States)

    Kwon, So Young; Cifuentes, Lauren

    2009-01-01

    The researchers investigated the comparative effects of individually-constructed and collaboratively-constructed computer-based concept mapping on middle school science concept learning. One hundred and sixty one students completed the entire study. Using prior science performance scores to assure equivalence of student achievement across groups,…

  11. A Web-Based Tool for Collaboration and Transdisciplinary Learning Design in Communities of Practice

    DEFF Research Database (Denmark)

    Vestergård, Erik; Hansen, Gitte Riis; Storm*, Helle

    2016-01-01

    idématch is a digital, web-based, and non-commercial platform developed by associate professors from University College Zealand, in cooperation with private enterprises, municipalities, and students. It is designed to bring students, public and private organizations, and citizens together......, and the development of analytical, experiential, experimental, and management competencies. Index Terms — collaborative, innovation, learning design, transdisciplinary....

  12. A Teachable-Agent-Based Game Affording Collaboration and Competition: Evaluating Math Comprehension and Motivation

    Science.gov (United States)

    Pareto, Lena; Haake, Magnus; Lindstrom, Paulina; Sjoden, Bjorn; Gulz, Agneta

    2012-01-01

    This paper presents an educational game in mathematics based on an apprenticeship model using a teachable agent, as well as an evaluative study of how the game affects (1) conceptual understanding and (2) attitudes towards mathematics. In addition, we discuss how collaborative and competitive affordances of the game may affect understanding and…

  13. Scaffolding Strategies for Wiki-Based Collaboration: Action Research in a Multicultural Japanese Language Program

    Science.gov (United States)

    Jung, Insung; Suzuki, Yoko

    2015-01-01

    Wikis can be used to encourage and support collaborative constructivist learning. However, their effectiveness depends upon the use of scaffolding strategies to guide the students in their use. This action research investigated three scaffolding strategies for wiki-based multicultural Japanese language learning: worked examples, grouping and peer…

  14. Improving Collaborative Learning in the Classroom: Text Mining Based Grouping and Representing

    Science.gov (United States)

    Erkens, Melanie; Bodemer, Daniel; Hoppe, H. Ulrich

    2016-01-01

    Orchestrating collaborative learning in the classroom involves tasks such as forming learning groups with heterogeneous knowledge and making learners aware of the knowledge differences. However, gathering information on which the formation of appropriate groups and the creation of graphical knowledge representations can be based is very effortful…

  15. A case for problem-based collaborative learning in the nursing classroom.

    Science.gov (United States)

    Richardson, Kathryn; Trudeau, Kimberlee J

    2003-01-01

    To facilitate student learning of the content in a clinical nursing course, the authors used ideas from Problem-based Learning (PBL) and collaborative learning to develop student writing assignments and group workshops. They describe the PBL-enhanced activities and student work, concluding with student feedback and future directions for this curriculum.

  16. Zoology Students' Experiences of Collaborative Enquiry in Problem-Based Learning

    Science.gov (United States)

    Harland, Tony

    2002-01-01

    This paper presents an action-research case study that focuses on experiences of collaboration in a problem-based learning (PBL) course in Zoology. Our PBL model was developed as a research activity in partnership with a commercial organisation. Consequently, learning was grounded in genuine situations of practice in which a high degree of…

  17. The Value of Picture-Book Reading-Based Collaborative Output Activities for Vocabulary Retention

    Science.gov (United States)

    Sun, Chia-Ho

    2017-01-01

    This study investigated the effects of three instructional modes: picture-book reading-only (PRO), picture-book reading plus vocabulary instruction (PRVI), and picture-book reading plus reading-based collaborative output activity (PRCOA) on young adult EFL (English as a foreign language) learners' vocabulary acquisition and retention. Eighty…

  18. Aligning Web-Based Tools to the Research Process Cycle: A Resource for Collaborative Research Projects

    Science.gov (United States)

    Price, Geoffrey P.; Wright, Vivian H.

    2012-01-01

    Using John Creswell's Research Process Cycle as a framework, this article describes various web-based collaborative technologies useful for enhancing the organization and efficiency of educational research. Visualization tools (Cacoo) assist researchers in identifying a research problem. Resource storage tools (Delicious, Mendeley, EasyBib)…

  19. Students' Views about the Problem Based Collaborative Learning Environment Supported by Dynamic Web Technologies

    Science.gov (United States)

    Ünal, Erhan; Çakir, Hasan

    2017-01-01

    The purpose of this study was to design a problem based collaborative learning environment supported by dynamic web technologies and to examine students' views about this learning environment. The study was designed as a qualitative research. Some 36 students who took an Object Oriented Programming I-II course at the department of computer…

  20. Using Concept Maps to Facilitate Collaborative Simulation-Based Inquiry Learning

    NARCIS (Netherlands)

    Gijlers, A.H.; Jong, de T.

    2013-01-01

    This study investigates the effect of a shared concept-mapping task on high school students' learning about kinematics in a collaborative simulation-based inquiry setting. Pairs of students were randomly assigned to a concept-mapping condition (12 pairs) or a control condition (13 pairs). Students i

  1. An Approach Based on Social Network Analysis Applied to a Collaborative Learning Experience

    Science.gov (United States)

    Claros, Iván; Cobos, Ruth; Collazos, César A.

    2016-01-01

    The Social Network Analysis (SNA) techniques allow modelling and analysing the interaction among individuals based on their attributes and relationships. This approach has been used by several researchers in order to measure the social processes in collaborative learning experiences. But oftentimes such measures were calculated at the final state…

  2. Learning from Multiple Collaborating Intelligent Tutors: An Agent-based Approach.

    Science.gov (United States)

    Solomos, Konstantinos; Avouris, Nikolaos

    1999-01-01

    Describes an open distributed multi-agent tutoring system (MATS) and discusses issues related to learning in such open environments. Topics include modeling a one student-many teachers approach in a computer-based learning context; distributed artificial intelligence; implementation issues; collaboration; and user interaction. (Author/LRW)

  3. Web-Based Collaborative Inquiry to Bridge Gaps in Secondary Science Education

    Science.gov (United States)

    Raes, Annelies; Schellens, Tammy; De Wever, Bram

    2014-01-01

    As secondary students' interest in science is decreasing, schools are faced with the challenging task of providing adequate instruction to engage students--and more particularly the disadvantaged students--to learn science and improve their science inquiry skills. In this respect, the integration of Web-based collaborative inquiry can be seen…

  4. Promoting Collaboration in a Project-Based E-Learning Context

    Science.gov (United States)

    Papanikolaou, Kyparisia; Boubouka, Maria

    2011-01-01

    In this paper we investigate the value of collaboration scripts for promoting metacognitive knowledge in a project-based e-learning context. In an empirical study, 82 students worked individually and in groups on a project using the e-learning environment MyProject, in which the life cycle of a project is inherent. Students followed a particular…

  5. SOOA: Exploring Special On-Off Attacks on Challenge-Based Collaborative Intrusion Detection Networks

    DEFF Research Database (Denmark)

    Li, Wenjuan; Meng, Weizhi; Kwok, Lam-For

    2017-01-01

    The development of collaborative intrusion detection networks (CIDNs) aims to enhance the performance of a single intrusion detection system (IDS), through communicating and collecting information from other IDS nodes. To defend CIDNs against insider attacks, trust-based mechanisms are crucial fo...

  6. Effects of Web-Based Collaborative Writing on Individual L2 Writing Development

    Science.gov (United States)

    Bikowski, Dawn; Vithanage, Ramyadarshanie

    2016-01-01

    This study investigated the effect of repeated in-class web-based collaborative writing tasks on second language writers' (L2) individual writing scores. A pre-test post-test research model was used in addition to participant surveys, class observations, and teacher interviews. Participants included 59 L2 writers in a writing class at a large U.S.…

  7. Scaffolding Strategies for Wiki-Based Collaboration: Action Research in a Multicultural Japanese Language Program

    Science.gov (United States)

    Jung, Insung; Suzuki, Yoko

    2015-01-01

    Wikis can be used to encourage and support collaborative constructivist learning. However, their effectiveness depends upon the use of scaffolding strategies to guide the students in their use. This action research investigated three scaffolding strategies for wiki-based multicultural Japanese language learning: worked examples, grouping and peer…

  8. Aligning Web-Based Tools to the Research Process Cycle: A Resource for Collaborative Research Projects

    Science.gov (United States)

    Price, Geoffrey P.; Wright, Vivian H.

    2012-01-01

    Using John Creswell's Research Process Cycle as a framework, this article describes various web-based collaborative technologies useful for enhancing the organization and efficiency of educational research. Visualization tools (Cacoo) assist researchers in identifying a research problem. Resource storage tools (Delicious, Mendeley, EasyBib)…

  9. A Mindtool-Based Collaborative Learning Approach to Enhancing Students' Innovative Performance in Management Courses

    Science.gov (United States)

    Wu, Chih-Hsiang; Hwang, Gwo-Jen; Kuo, Fan-Ray; Huang, Iwen

    2013-01-01

    Educators have indicated that creative teaching is the most important educational activity; nevertheless, most existing education systems fail to engage students in effective creative tasks. To address this issue, this study proposes a mind map based collaborative learning approach for supporting creative learning activities and enhancing…

  10. The Role of Evidence-Based Practice in Collaborations between Academic Librarians and Education Faculty

    Science.gov (United States)

    Adams, Nancy E.; Gaffney, Maureen A.; Lynn, Valerie

    2016-01-01

    This qualitative study describes collaborations between academic librarians and faculty in education-related disciplines involving evidence-based practice (EBP), an approach that combines the best available research with the professional's experience and expertise. The authors analyzed narratives of academic librarians and their educator partners…

  11. Students' Confidence and Perceived Value for Participating in Cross-Cultural Wiki-Based Collaborations

    Science.gov (United States)

    Ertmer, Peggy A.; Newby, Timothy J.; Liu, Wei; Tomory, Annette; Yu, Ji Hyun; Lee, Young Mi

    2011-01-01

    An international wiki-based collaboration was integrated into a large introductory educational technology course enrolling 346 students, divided into 43 teams. Student teams participated in a 5-week project in which they created wiki chapters about the educational uses of specific Web 2.0 tools. Two to four international students, located in their…

  12. Scaffolding Information Problem Solving in Web-Based Collaborative Inquiry Learning

    Science.gov (United States)

    Raes, Annelies; Schellens, Tammy; De Wever, Bram; Vanderhoven, Ellen

    2012-01-01

    This study investigated the impact of different modes of scaffolding on students who are learning science through a web-based collaborative inquiry project in authentic classroom settings and explored the interaction effects with students' characteristics. The intervention study aimed to improve "domain-specific knowledge" and "metacognitive…

  13. Web-Based Collaborative Inquiry to Bridge Gaps in Secondary Science Education

    Science.gov (United States)

    Raes, Annelies; Schellens, Tammy; De Wever, Bram

    2014-01-01

    As secondary students' interest in science is decreasing, schools are faced with the challenging task of providing adequate instruction to engage students--and more particularly the disadvantaged students--to learn science and improve their science inquiry skills. In this respect, the integration of Web-based collaborative inquiry can be seen as a…

  14. Proactive behaviour may lead to failure in virtual project-based collaborative learning

    DEFF Research Database (Denmark)

    Bjørn, Pernille; Hertzum, Morten

    2005-01-01

    This paper argues that proactive behaviour, caused by high engagement and motivation of the learners, may lead to failure of collaborative learning. By examining empirical data from real-world text-only virtual negotiations between dispersed participants engaged in project-based collaborative...... learning, we discover that volunteering self-initiated activities promotes the participants’ individualistic behaviour. Also, the technology made it easy for participants to include their own statements in new contributions and deconstruct the statements of others, permitting few opportunities for others...

  15. Simulation of herbicide degradation in different soils by use of Pedo-transfer functions (PTF) and non-linear kinetics.

    Science.gov (United States)

    von Götz, N; Richter, O

    1999-03-01

    The degradation behaviour of bentazone in 14 different soils was examined at constant temperature and moisture conditions. Two soils were examined at different temperatures. On the basis of these data the influence of soil properties and temperature on degradation was assessed and modelled. Pedo-transfer functions (PTF) in combination with a linear and a non-linear model were found suitable to describe the bentazone degradation in the laboratory as related to soil properties. The linear PTF can be combined with a rate related to the temperature to account for both soil property and temperature influence at the same time.

  16. iPTF15dtg: a double-peaked Type Ic supernova from a massive progenitor

    Science.gov (United States)

    Taddia, F.; Fremling, C.; Sollerman, J.; Corsi, A.; Gal-Yam, A.; Karamehmetoglu, E.; Lunnan, R.; Bue, B.; Ergon, M.; Kasliwal, M.; Vreeswijk, P. M.; Wozniak, P. R.

    2016-08-01

    Context. Type Ic supernovae (SNe Ic) arise from the core-collapse of H- (and He-) poor stars, which could either be single Wolf-Rayet (WR) stars or lower-mass stars stripped of their envelope by a companion. Their light curves are radioactively powered and usually show a fast rise to peak (~10-15 d), without any early (in the first few days) emission bumps (with the exception of broad-lined SNe Ic) as sometimes seen for other types of stripped-envelope SNe (e.g., Type IIb SN 1993J and Type Ib SN 2008D). Aims: We have studied iPTF15dtg, a spectroscopically normal SN Ic with an early excess in the optical light curves followed by a long (~30 d) rise to the main peak. It is the first spectroscopically-normal double-peaked SN Ic to be observed. Our aim is to determine the properties of this explosion and of its progenitor star. Methods: Optical photometry and spectroscopy of iPTF15dtg was obtained with multiple telescopes. The resulting light curves and spectral sequence are analyzed and modeled with hydrodynamical and analytical models, with particular focus on the early emission. Results: iPTF15dtg is a slow rising SN Ic, similar to SN 2011bm. Hydrodynamical modeling of the bolometric properties reveals a large ejecta mass (~10 M⊙) and strong 56Ni mixing. The luminous early emission can be reproduced if we account for the presence of an extended (≳500 R⊙), low-mass (≳0.045 M⊙) envelope around the progenitor star. Alternative scenarios for the early peak, such as the interaction with a companion, a shock-breakout (SBO) cooling tail from the progenitor surface, or a magnetar-driven SBO are not favored. Conclusions: The large ejecta mass and the presence of H- and He-free extended material around the star suggest that the progenitor of iPTF15dtg was a massive (≳35 M⊙) WR star that experienced strong mass loss.

  17. PBrowse: a web-based platform for real-time collaborative exploration of genomic data.

    Science.gov (United States)

    Szot, Peter S; Yang, Andrian; Wang, Xin; Parsania, Chirag; Röhm, Uwe; Wong, Koon Ho; Ho, Joshua W K

    2017-05-19

    Genome browsers are widely used for individually exploring various types of genomic data. A handful of genome browsers offer limited tools for collaboration among multiple users. Here, we describe PBrowse, an integrated real-time collaborative genome browser that enables multiple users to simultaneously view and access genomic data, thereby harnessing the wisdom of the crowd. PBrowse is based on the Dalliance genome browser and has a re-designed user and data management system with novel collaborative functionalities, including real-time collaborative view, track comment and an integrated group chat feature. Through the Distributed Annotation Server protocol, PBrowse can easily access a wide range of publicly available genomic data, such as the ENCODE data sets. We argue that PBrowse represents a paradigm shift from using a genome browser as a static data visualization tool to a platform that enables real-time human-human interaction and knowledge exchange in a collaborative setting. PBrowse is available at http://pbrowse.victorchang.edu.au, and its source code is available via an open source BSD 3 license at http://github.com/VCCRI/PBrowse. © The Author(s) 2017. Published by Oxford University Press on behalf of Nucleic Acids Research.

  18. Spread Spectrum Based Energy Efficient Collaborative Communication in Wireless Sensor Networks.

    Science.gov (United States)

    Ghani, Anwar; Naqvi, Husnain; Sher, Muhammad; Khan, Muazzam Ali; Khan, Imran; Irshad, Azeem

    2016-01-01

    Wireless sensor networks consist of resource limited devices. Most crucial of these resources is battery life, as in most applications like battle field or volcanic area monitoring, it is often impossible to replace or recharge the power source. This article presents an energy efficient collaborative communication system based on spread spectrum to achieve energy efficiency as well as immunity against jamming, natural interference, noise suppression and universal frequency reuse. Performance of the proposed system is evaluated using the received signal power, bit error rate (BER) and energy consumption. The results show a direct proportionality between the power gain and the number of collaborative nodes as well as BER and signal-to-noise ratio (Eb/N0). The analytical and simulation results of the proposed system are compared with SISO system. The comparison reveals that SISO perform better than collaborative communication in case of small distances whereas collaborative communication performs better than SISO in case of long distances. On the basis of these results it is safe to conclude that collaborative communication in wireless sensor networks using wideband systems improves the life time of nodes in the networks thereby prolonging the network's life time.

  19. Internet-based collaborative pseudo-dynamic testing of multi-span bridge structure

    Institute of Scientific and Technical Information of China (English)

    Dapeng Wang; Shizhu Tian; Xinjiang Cai; Yunlei Fan; Yan Xiao

    2009-01-01

    In this paper,the first Internet-based collaborative pseudo-dynamic testing of a multi-span bridge system in mainland China is presented in detail,which has been carried out by the collaboration of Hunan University (HNU),Harbin Institute of Technology (HIT) and Tsinghua University (TU) in mainland China,and the University of Southern California (USC) in the USA.The prototype system of Russion River Bridge at Southern California in America is illustrated.Different testing specimens,testing equipments and substructure boundary conditions at HNU and HIT laboratories are described.A network protocol platform for collaborative pseudo-dynamic testing,called NetSLab,and some function modules developed on the use of its standardized interface are introduced.Aiming at the MTS system widely used in structural testing,two approaches are presented to implement the communication interface between NetSLab and testing equipment,respectively,studied by HNU and HIT.The integrated networked testing system and collaborative testing procedures are presented.The testing results manifest that the networked collaborative testing system with powerful capability provides a testing platform with good coordination for complex models or actual structures,and achieves remote sharing of testing equipments.(C) 2009 National Natural Science Foundation of China and Chinese Academy of Sciences.Published by Elsevier Limited and Science inChina Press.All rights reserved.

  20. What teacher education students learn about collaboration from problem-based learning

    Directory of Open Access Journals (Sweden)

    Rosalind Murray-Harvey

    2013-08-01

    Full Text Available Group work, an essential component of learning and teaching in problem-based learning (PBL, is compromised if students’ experiences of PBL are colored by dissatisfaction with the process or outcomes. For the potential benefits of PBL to be realized PBL group work must be genuinely collaborative to address students’ personal and professional learning needs. Australian teacher education students (n=122 provided written reflections on PBL that enabled representations of their group work experience to be mapped using an Attitude, Skills, and Knowledge (ASK framework to gauge understanding of the collaborative learning process (as learners and as future teachers. Attitudes identified as necessary for collaborative learning were valuing others’ perspectives, interdependence, and learning about self. The Skills dimension characterized interpersonal, problem solving and group skills. Features of the Knowledge dimension were: generation, application, and dissemination of knowledge. Pedagogical knowledge was also evident through learning connections made by students to their future teaching practice.

  1. [Teaching Desktop] Video Conferencing in a Collaborative and Problem Based Setting

    DEFF Research Database (Denmark)

    Ørngreen, Rikke; Mouritzen, Per

    2013-01-01

    of delay and sound problems, where different embodiment and space‐design influence the learning process. However, we also find that the PBL‐setup inspires the students to apply theory into practice and to reflect on their own practice, furthermore the collaborative approach support the feeling of trust......This paper presents experiences from teaching video conferencing for learning and collaboration, and discusses the challenges and potentials of applying a collaborative and problem‐based learning (PBL) pedagogy. The research is an action research study, and we as researchers, educational planners...... conferences. We studied 3 subsequent years of a master program module on video conferencing, and the changes it has undergone. The participants work in groups and each group has the task of designing a short one hour (45min) educational design of their own choice. The students have to try out and evaluate...

  2. A model for mold collaborative manufacturing execution system based on Web Service

    Institute of Scientific and Technical Information of China (English)

    Zhao Lizhong; Wang Yanbin; Gao Guoan

    2006-01-01

    Mold manufacturing Extended Enterprise (EE) has the following characteristics: distributed in locality, tight cooperation and frequent information exchange. It needs a collaborative, highly efficient, reliable and intelligent manufacturing management system. The background of the Collaborative Manufacturing is introduced. A mold Collaborative Manufacturing Execution System (c-MES) is proposed. The feature of Web Service platform is analyzed. The necessity and feasibility of importing the Web Service to mold c-MES are discussed. Based on Web Service, the model of mold c-MES is built. Every module's function is described in detail, including the functions it supplies and the mechanism of information interaction among them. The feasibility of mold c-MES model is validated by a real mold manufacturing case.

  3. Collaborative Environments. Considerations Concerning Some Collaborative Systems

    Directory of Open Access Journals (Sweden)

    Mihaela I. MUNTEAN

    2009-01-01

    Full Text Available It is obvious, that all collaborative environments (workgroups, communities of practice, collaborative enterprises are based on knowledge and between collaboration and knowledge management there is a strong interdependence. The evolution of information systems in these collaborative environments led to the sudden necessity to adopt, for maintaining the virtual activities and processes, the latest technologies/systems, which are capable to support integrated collaboration in business services. In these environments, portal-based IT platforms will integrate multi-agent collaborative systems, collaborative tools, different enterprise applications and other useful information systems.

  4. A Region-Based Strategy for Collaborative Roadmap Construction

    KAUST Repository

    Denny, Jory

    2015-01-01

    © Springer International Publishing Switzerland 2015. Motion planning has seen much attention over the past two decades. A great deal of progress has been made in sampling-based planning, whereby a planner builds an approximate representation of the planning space. While these planners have demonstrated success inmany scenarios, there are still difficult problems where they lack robustness or efficiency, e.g., certain types of narrow spaces. Conversely, human intuition can often determine an approximate solution to these problems quite effectively, but humans lack the speed and precision necessary to perform the corresponding low-level tasks (such as collision checking) in a timely manner. In this work, we introduce a novel strategy called Region Steering in which the user and a PRM planner work cooperatively to map the space while maintaining the probabilistic completeness property of the PRMplanner. Region Steering utilizes two-way communication to integrate the strengths of both the user and the planner, thereby overcoming the weaknesses inherent to relying on either one alone. In one communication direction, a user can input regions, or bounding volumes in the workspace, to bias sampling towards or away from these areas. In the other direction, the planner displays its progress to the user and colors the regions based on their perceived usefulness.We demonstrate that Region Steering provides roadmap customizability, reduced mapping time, and smaller roadmap sizes compared with fully automated PRMs, e.g., Gaussian PRM.

  5. Product Knowledge Representation and Integration Technology in Web-based Collaborative Design

    Institute of Scientific and Technical Information of China (English)

    HAO Wentao; TIAN Ling; LUO Wei; TONG Bingshu

    2006-01-01

    Because of the complexity of modern product design, the web-based collaborative product design aroused considerable attention of manufacturers in the last few years with the development of Internet technology. But it is still hardly achievable due to the difficulty to share product knowledge from different designers and systems. In this paper, we firstly create an ontology-based product model, which consists of PPR (Product, Process and Resource) concept models and PPR characteristic models, to describe product knowledge. Afterwards, how to represent the model in XML is discussed in detail. Then the mechanism of product knowledge collection and integration from different application systems based on interface agents is introduced. At last, a web-based open-architecture product knowledge integrating and sharing prototype system AD-HUB is developed. An example is also given and it shows that the theory discussed in this paper is efficient to represent and integrate product knowledge in web-based collaborative design processes.

  6. A Web Based Collaborative Design Environment for Spacecraft

    Science.gov (United States)

    Dunphy, Julia

    1998-01-01

    In this era of shrinking federal budgets in the USA we need to dramatically improve our efficiency in the spacecraft engineering design process. We have come up with a method which captures much of the experts' expertise in a dataflow design graph: Seamlessly connectable set of local and remote design tools; Seamlessly connectable web based design tools; and Web browser interface to the developing spacecraft design. We have recently completed our first web browser interface and demonstrated its utility in the design of an aeroshell using design tools located at web sites at three NASA facilities. Multiple design engineers and managers are now able to interrogate the design engine simultaneously and find out what the design looks like at any point in the design cycle, what its parameters are, and how it reacts to adverse space environments.

  7. Promoting collaboration skills on reflection concept through multimedia-based integrated instruction

    Science.gov (United States)

    Hermawan, Hermawan; Siahaan, Parsaoran; Suhendi, Endi; Samsudin, Achmad

    2017-05-01

    Multimedia-Based Integrated Instructions (MBI2) has been developed to promote the collaboration skills on reflection concepts turn into more real and meaningful learning. The initial design of MBI2 in the form of a multimedia computer that allows users to explore the concept of the overall reflectance of the light through the conceptual and practical aspects that have been developed. MBI2has been developed to promoteone of the skills that the 21st-century skills to students'junior high school that is collaboration skill in order to compete in the future life. The ability to collaborate is divided into five aspects, namely contributions, time management, problem-solving, working with others and research techniques. Research methods utiliseed in this study is an exploration and instructional development 4D model (define, design, develop and disseminate). Based on data analysis, it can be concluded that the development of integrated multimedia-based instruction (MBI2) on the concept of reflection through the 4D developing model was effectively to enhance collaboration skills of students'junior high school.

  8. A Web-Based Development Environment for Collaborative Data Analysis

    CERN Document Server

    Erdmann, M; Glaser, C; Klingebiel, D; Komm, M; Müller, G; Rieger, M; Steggemann, J; Urban, M; Winchen, T

    2014-01-01

    Visual Physics Analysis (VISPA) is a web-based development environment addressing high energy and astroparticle physics. It covers the entire analysis spectrum from the design and validation phase to the execution of analyses and the visualization of results. VISPA provides a graphical steering of the analysis ow, which consists of self-written, re-usable Python and C++ modules for more demanding tasks. All common operating systems are supported since a standard internet browser is the only software requirement for users. Even access via mobile and touch-compatible devices is possible. In this contribution, we present the most recent developments of our web application concerning technical, state-of-the-art approaches as well as practical experiences. One of the key features is the use of workspaces, i.e. user-congurable connections to remote machines supplying resources and local le access. Thereby, workspaces enable the management of data, computing resources (e.g. remote clusters or computing grids), and a...

  9. Project-based Collaborative learning in distance education

    DEFF Research Database (Denmark)

    Knudsen, Morten; Bajard, Christine; Helbo, Jan

    2004-01-01

    This article describes the experiences drawn from an experiment in transferring positive experience with a project-organised on-campus engineering programme to a technology supported distance education programme. Three years of experience with the Master of Industrial Information Technology (MII)......, didactic adjustments have been made based on feedback, in particular from evaluation questionnaires. This process has been very constructive in approaching the goal: a successful model for project organized learning in distance education.......This article describes the experiences drawn from an experiment in transferring positive experience with a project-organised on-campus engineering programme to a technology supported distance education programme. Three years of experience with the Master of Industrial Information Technology (MII......) programme indicates, however, that adjustments are required in transforming the on-campus model to distance education. The main problem is that while project work is an excellent regulator of the learning process for on-campus students, this does not seem to be the case for off-campus students. Consequently...

  10. Project-Based Collaborative Learning in Distance Education

    DEFF Research Database (Denmark)

    Knudsen, Morten; Bajard, C.; Helbo, Jan

    2003-01-01

    This article describes the experiences drawn from an experiment in transferring positive experience with a project-organised on-campus engineering programme to a technology supported distance education programme. Three years of experience with the Master of Industrial Information Technology (MII)......, didactic adjustments have been made based on feedback, in particular from evaluation questionnaires. This process has been very constructive in approaching the goal: a successful model for project organized learning in distance education.......This article describes the experiences drawn from an experiment in transferring positive experience with a project-organised on-campus engineering programme to a technology supported distance education programme. Three years of experience with the Master of Industrial Information Technology (MII......) programme indicates, however, that adjustments are required in transforming the on-campus model to distance education. The main problem is that while project work is an excellent regulator of the learning process for on-campus students, this does not seem to be the case for off-campus students. Consequently...

  11. Mapping an Experiment-Based Assessment of Collaborative Behavior onto Collaborative Problem Solving in PISA 2015: A Cluster Analysis Approach for Collaborator Profiles

    Science.gov (United States)

    Herborn, Katharina; Mustafic, Maida; Greiff, Samuel

    2017-01-01

    Collaborative problem solving (CPS) assessment is a new academic research field with a number of educational implications. In 2015, the Programme for International Student Assessment (PISA) assessed CPS with a computer-simulated human-agent (H-A) approach that claimed to measure 12 individual CPS skills for the first time. After reviewing the…

  12. Collaborative, case-based learning: how do students actually learn from each other?

    Science.gov (United States)

    Thurman, Joanne; Volet, Simone E; Bolton, John R

    2009-01-01

    The value of collaborative, case-based, and problem-based learning has received increased attention in recent years. Several studies have documented veterinary staff and students' generally positive feedback on group learning activities, but one largely unaddressed question is how students actually learn from each other. This study examined how second-year veterinary students learned from each other during a collaborative, case-based learning project. Data were students' written reflections on their learning in the veterinary course and the specific learning experience, and a matched pre- and post-task questionnaire. Consistent with prior research describing veterinary students as individualistic learners, only a third of students spontaneously mentioned learning from each other as one of their most effective strategies. However, when prompted to describe a time when they felt that group members were really learning from each other, students reported highly valuable collaborative learning processes, which they explicitly linked to learning and understanding benefits. Questionnaire data were consistent, showing that students became more positive toward several aspects of the activity as well as toward group work in general. One unexpected finding was the lack of a relationship between students' self-evaluation of their learning and how well group members knew each other. These findings provide strong support for the educational value of collaborative, case-based learning. In light of other research evidence (using observation data) that the amount of time students actually engage in high-level collaborative processes may be rather limited, this article points to the need for veterinary teachers to better prepare students for group learning activities.

  13. A Proactive Strategy for Safe Human-Robot Collaboration based on a Simplified Risk Analysis

    Directory of Open Access Journals (Sweden)

    Audun Sanderud

    2015-01-01

    Full Text Available In an increasing demand for human-robot collaboration systems, the need for safe robots is crucial. This paper presents a proactive strategy to enable an awareness of the current risk for the robot. The awareness is based upon a map of historically occupied space by the operator. The map is built based on a risk evaluation of each pose presented by the operator. The risk evaluation results in a risk field that can be used to evaluate the risk of a collaborative task. Based on this risk field, a control algorithm that constantly reduces the current risk within its task constraints was developed. Kinematic redundancy was exploited for simultaneous task performance within task constraints, and risk minimization. Sphere-based geometric models were used both for the human and robot. The strategy was tested in simulation, and implemented and experimentally tested on a NACHI MR20 7-axes industrial robot.

  14. ICT support for students’ collaboration in problem and project based learning

    DEFF Research Database (Denmark)

    Rongbutsri, Nikorn; Khalid, Md. Saifuddin; Ryberg, Thomas

    2011-01-01

    This paper reports and analyses quantitative and qualitative data from a study, which seeks a better understanding of how students use various technologies to support their project collaboration activities in a problem and project based learning environment. More generally the aim of the study, a......, and the present paper, is to shed light on students’ technology practices within higher education – particularly in relation to problem and project based learning....

  15. An Approach to Collaborative Design Based on Distributed Constraint-Net

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    We focuse on design process in concurrent engineering and propose an approach to collabora-tire design based on distributed constraint-net. The approach adopts agent technology to express kinds ofdistributed constraints. And through the cooperation among agents, the consistency of constraint is main-tained and the constraint conflict is detected and eliminated. The constraints are satisfied concurrently anddistributively. Based on the proposed approach, the collaborative design process in concurrent engineeringcan be well supported.

  16. INTERVIEW: Quick, Social and Collaborative - wiki-based user documentation at APC by Schneider Electric

    DEFF Research Database (Denmark)

    Møller, Margrethe H.; Pernille Bagger Nielsen, Pernille; Kalianov, Stanislav

    2013-01-01

    In the software documentation department at APC by Schneider Electric in Kolding, Denmark, Technical Writer Pernille Bagger Nielsen writes user documentation for the software developed by the company. In cooperation with Localization Manager Stanislav Kalianov she reorganised the user documentation...... for publication as wiki-based documentation on the internet. The new platform supports their strategy of using agile and iterative, topic-based, collaborative writing when developing user documentation. Their experience will interest readers who consider introducing a similar new strategy....

  17. Agent Behavior-Based Simulation Study on Mass Collaborative Product Development Process

    Directory of Open Access Journals (Sweden)

    Shuo Zhang

    2015-01-01

    Full Text Available Mass collaborative product development (MCPD benefits people by high innovation products with lower cost and shorter lead time due to quick development of group innovation, Internet-based customization, and prototype manufacturing. Simulation is an effective way to study the evolution process and therefore to guarantee the success of MCPD. In this paper, an agent behavior-based simulation approach of MCPD is developed, which models the MCPD process as the interactive process of design agents and the environment objects based on Complex Adaptive System (CAS theory. Next, the structure model of design agent is proposed, and the modification and collaboration behaviors are described. Third, the agent behavior-based simulation flow of MCPD is designed. At last, simulation experiments are carried out based on an engineering case of mobile phone design. The experiment results show the following: (1 the community scale has significant influence on MCPD process; (2 the simulation process can explicitly represent the modification and collaboration behaviors of design agents; (3 the community evolution process can be observed and analyzed dynamically based on simulation data.

  18. Exploring Student Engagement and Collaborative Learning in a Community-Based Module in Fine Art

    Directory of Open Access Journals (Sweden)

    John McGarrigle

    2013-05-01

    Full Text Available This article is based on masters research1 into student and civic engagement using a case study of an innovative Community Based Module in a Fine Art degree course (McGarrigle, 2009. 2 (Flyvbjerg, 2006 notes that contrary to some common misunderstandings around case study research, it is possible to use individual case study to test theory particularly in relation to falsification. The research presented here is based on student’s repsonses to Coates’ (2007 quantitative study of student engagement and attempts to test his engagement typology which identifies the terms passive, intense, independent or collaborative to apply to students’ approaches to online and general campus learning. In a participatory action research framework, low agreement was found between students (n=13 and lecturers (n=3 in assigning these terms to student postings to online discussion fora. This presents a challenge to the validity of such a narrow typology, and discussions with this student group suggested the addition of ‘adaptive’ as a valid student approach to the varied demands of third level learning. Further evidence from the case study found greater student collaboration in discussion fora when linked to practical course activity. Qualitative analysis of discussion threads using conversation analysis provided evidence for collaboration in deeper knowledge construction when supported by lecturers’ contributions. Collaborative approaches to learning may support learning within a social constructivist paradigm, though acknowledgement must be made of the context of an individualistic society where competition may present real or imagined barriers to student collaboration. An argument is made for Pedagogies for Community Engagement to promote these ways of learning to in order to develop active and engaged citizens of the future.

  19. iPTF15dtg: a double-peaked Type Ic Supernova from a massive progenitor

    CERN Document Server

    Taddia, F; Sollerman, J; Corsi, A; Gal-Yam, A; Karamehmetoglu, E; Lunnan, R; Bue, B; Ergon, M; Kasliwal, M; Vreeswijk, P M; Wozniak, P R

    2016-01-01

    Type Ic supernovae (SNe Ic) arise from the core-collapse of H (and He) poor stars, which could be either single WR stars or lower-mass stars stripped of their envelope by a companion. Their light curves are radioactively powered and usually show a fast rise to peak ($\\sim$10-15 d), without any early (first few days) emission bumps (with the exception of broad-lined SNe Ic) as sometimes seen for other types of stripped-envelope SNe (e.g., Type IIb SN 1993J and Type Ib SN 2008D). We have studied iPTF15dtg, a spectroscopically normal SN Ic with an early excess in the optical light curves followed by a long ($\\sim$30 d) rise to the main peak. It is the first spectroscopically-normal double-peaked SN Ic observed. We aim to determine the properties of this explosion and of its progenitor star. Optical photometry and spectroscopy of iPTF15dtg was obtained with multiple telescopes. The resulting light curves and spectral sequence are analyzed and modelled with hydrodynamical and analytical models, with particular foc...

  20. Discovery, Progenitor & Early Evolution of a Stripped Envelope Supernova iPTF13bvn

    CERN Document Server

    Cao, Yi; Arcavi, Iair; Horesh, Assaf; Hancock, Paul; Valenti, Stefano; Cenko, S Bradley; Kulkarni, S R; Gal-Yam, Avishay; Gorbikov, Evgeny; Ofek, Eran O; Sand, David; Yaron, Ofer; Graham, Melissa; Silverman, Jeffrey M; Wheeler, J Craig; Marion, G H; Walker, Emma; Mazzali, Paolo; Howell, D Andrew; Bloom, Josh; Nugent, Peter E; Surace, Jason; Masci, Frank; Carpenter, John; Degenaar, Nathalie; Gelino, Christopher

    2013-01-01

    The intermediate Palomar Transient Factory reports our discovery of a young supernova, iPTF13bvn, in the nearby galaxy, NGC5806 (22.5Mpc). Our spectral sequence in the optical and infrared suggests a likely Type Ib classification. We identify a single, blue progenitor candidate in deep pre-explosion imaging within a 2sigma error circle of 80 mas (8.7 pc). The candidate has a MB luminosity of -5.2+/-0.4 mag and a B-I color of 0.1+/-0.3 mag. If confirmed by future observations, this would be the first direct detection for a progenitor of a Type Ib. Fitting a power law to the early light curve, we find an extrapolated explosion date around 1.1 days before our first detection. We see no evidence of shock cooling. The pre-explosion detection limits constrain the radius of the progenitor to be smaller than a few solar radii. iPTF13bvn is also detected in cm and mm-wavelengths. Fitting a synchrotron self-absorption model to our radio data, we ?nd a mass loading parameter of 1.3*10^12 g/cm. Assuming a wind velocity o...

  1. Explaining the Type Ia Supernova PTF 11kx with the Core Degenerate Scenario

    CERN Document Server

    Soker, Noam; Garcia-Berro, Enrique; Torres, Santiago; Camacho, Judit

    2012-01-01

    We argue that the multiple shells of circumstellar material (CSM) and the supernovae (SN) ejecta interaction with the CSM starting 59 days after the explosion of the Type Ia SN (SN Ia) PTF 11kx, are best described by the core-degenerate (CD) scenario for SN Ia. In the CD scenario the super-Chandrasekhar mass white dwarf (WD) is formed at the termination of the common envelope phase from a merger of a WD companion with the hot core of a massive asymptotic giant branch (AGB) star. In most cases the WD is destructed and accreted onto the more massive core. However, in rare cases where mergers take place when the WD is denser than the core, the core will be destructed and accreted onto the cooler WD. In such cases the explosion might occur with no appreciable delay, i.e., months to years after the termination of the common envelope (CE) phase. This, we propose, is the evolutionary route that lead to the explosion of PTF 11kx. The CD scenario can account for the very massive CSM within ~1000 AU of the exploding PT...

  2. Strong near-infrared carbon in the Type Ia supernova iPTF13ebh

    CERN Document Server

    Hsiao, E Y; Contreras, C; Höflich, P; Sand, D; Marion, G H; Phillips, M M; Stritzinger, M; González-Gaitán, S; Mason, R E; Folatelli, G; Parent, E; Gall, C; Amanullah, R; Anupama, G C; Arcavi, I; Banerjee, D P K; Beletsky, Y; Blanc, G A; Bloom, J S; Brown, P J; Campillay, A; Cao, Y; De Cia, A; Diamond, T; Freedman, W L; Gonzalez, C; Goobar, A; Holmbo, S; Howell, D A; Johansson, J; Kasliwal, M M; Kirshner, R P; Krisciunas, K; Kulkarni, S R; Maguire, K; Milne, P A; Morrell, N; Nugent, P E; Ofek, E O; Osip, D; Palunas, P; Perley, D A; Persson, S E; Piro, A L; Rabus, M; Roth, M; Schiefelbein, J M; Srivastav, S; Sullivan, M; Suntzeff, N B; Surace, J; Woźnia, P R; Yaron, O

    2015-01-01

    We present near-infrared (NIR) time-series spectroscopy, as well as complementary ultraviolet (UV), optical, and NIR data, of the Type Ia supernova (SN Ia) iPTF13ebh, which was discovered within two days from the estimated time of explosion. The first NIR spectrum was taken merely 2.3 days after explosion and may be the earliest NIR spectrum yet obtained of a SN Ia. The most striking features in the spectrum are several NIR C I lines, and the C I {\\lambda}1.0693 {\\mu}m line is the strongest ever observed in a SN Ia. Interestingly, no strong optical C II counterparts were found, even though the optical spectroscopic time series began early and is densely-cadenced. Except at the very early epochs, within a few days from the time of explosion, we show that the strong NIR C I compared to the weaker optical C II appears to be general in SNe Ia. iPTF13ebh is a fast decliner with {\\Delta}m15(B) = 1.79 $\\pm$ 0.01, and its absolute magnitude obeys the linear part of the width-luminosity relation. It is therefore categ...

  3. Pulsational Pair-instability Model for Superluminous Supernova PTF12dam: Interaction and Radioactive Decay

    Science.gov (United States)

    Tolstov, Alexey; Nomoto, Ken’ichi; Blinnikov, Sergei; Sorokina, Elena; Quimby, Robert; Baklanov, Petr

    2017-02-01

    Being a superluminous supernova, PTF12dam can be explained by a 56Ni-powered model, a magnetar-powered model, or an interaction model. We propose that PTF12dam is a pulsational pair-instability supernova, where the outer envelope of a progenitor is ejected during the pulsations. Thus, it is powered by a double energy source: radioactive decay of 56Ni and a radiative shock in a dense circumstellar medium. To describe multicolor light curves and spectra, we use radiation-hydrodynamics calculations of the STELLA code. We found that light curves are well described in the model with 40 M⊙ ejecta and 20–40 M⊙ circumstellar medium. The ejected 56Ni mass is about 6 M⊙, which results from explosive nucleosynthesis with large explosion energy (2–3) × 1052 erg. In comparison with alternative scenarios of pair-instability supernova and magnetar-powered supernova, in the interaction model, all the observed main photometric characteristics are well reproduced: multicolor light curves, color temperatures, and photospheric velocities.

  4. The PTF Orion Project: a Possible Planet Transiting a T-Tauri Star

    CERN Document Server

    van Eyken, Julian C; von Braun, Kaspar; Kane, Stephen R; Plavchan, Peter; Bender, Chad F; Brown, Timothy M; Crepp, Justin; Fulton, Benjamin J; Howard, Andrew W; Howell, Steve B; Mahadevan, Suvrath; Marcy, Geoffrey W; Shporer, Avi; Szkody, Paula; Akeson, Rachel L; Beichman, Charles A; Boden, Andrew F; Gelino, Dawn M; Hoard, D W; Ramírez, Solange V; Rebull, Luisa M; Stauffer, John R; Bloom, Joshua S; Cenko, S Bradley; Kasliwal, Mansi M; Kulkarni, Shrinivas R; Law, Nicholas M; Nugent, Peter E; Ofek, Eran O; Poznanski, Dovi; Quimby, Robert M; Walters, Richard; Grillmair, Carl J; Laher, Russ; Levitan, David B; Sesar, Branimir; Surace, Jason A

    2012-01-01

    We report observations of a possible young transiting planet orbiting a previously known weak-lined T-Tauri star in the 7-10Myr-old Orion-OB1a/25-Ori region. The candidate was found as part of the Palomar Transient Factory (PTF) Orion project. It has a photometric transit period of 0.448413 \\pm 0.000040 days, and appears in both 2009 and 2010 PTF data. Follow-up low-precision radial velocity observations and adaptive-optics imaging suggest that the star is not an eclipsing binary, and that it is unlikely that a background source is blended with the target and mimicking the observed transit. Radial-velocity observations with the Hobby-Eberly and Keck telescopes yield a radial velocity that has the same period as the photometric event, but is offset in phase from the transit center by \\approx -0.22 periods. The amplitude (half range) of the radial velocity variations is 2.4 km/s and is comparable with the expected radial velocity amplitude that stellar spots could induce. The radial velocity curve is likely dom...

  5. VizieR Online Data Catalog: Imaging observations of iPTF 13ajg (Vreeswijk+, 2014)

    Science.gov (United States)

    Vreeswijk, P. M.; Savaglio, S.; Gal-Yam, A.; De Cia, A.; Quimby, R. M.; Sullivan, M.; Cenko, S. B.; Perley, D. A.; Filippenko, A. V.; Clubb, K. I.; Taddia, F.; Sollerman, J.; Leloudas, G.; Arcavi, I.; Rubin, A.; Kasliwal, M. M.; Cao, Y.; Yaron, O.; Tal, D.; Ofek, E. O.; Capone, J.; Kutyrev, A. S.; Toy, V.; Nugent, P. E.; Laher, R.; Surace, J.; Kulkarni, S. R.

    2017-08-01

    iPTF 13ajg was imaged with the Palomar 48 inch (P48) Oschin iPTF survey telescope equipped with a 12kx8k CCD mosaic camera (Rahmer et al. 2008SPIE.7014E..4YR) in the Mould R filter, the Palomar 60 inch and CCD camera (Cenko et al. 2006PASP..118.1396C) in Johnson B and Sloan Digital Sky Survey (SDSS) gri, the 2.56 m Nordic Optical Telescope (on La Palma, Canary Islands) with the Andalucia Faint Object Spectrograph and Camera (ALFOSC) in SDSS ugriz, the 4.3 m Discovery Channel Telescope (at Lowell Observatory, Arizona) with the Large Monolithic Imager (LMI) in SDSS r, and with LRIS (Oke et al. 1995PASP..107..375O) and the Multi-Object Spectrometer for Infrared Exploration (MOSFIRE; McLean et al. 2012SPIE.8446E..0JM), both mounted on the 10 m Keck-I telescope (on Mauna Kea, Hawaii), in g and Rs with LRIS and J and Ks with MOSFIRE. (1 data file).

  6. sbtools: A package connecting R to cloud-based data for collaborative online research

    Science.gov (United States)

    Winslow, Luke; Chamberlain, Scott; Appling, Alison P.; Read, Jordan S.

    2016-01-01

    The adoption of high-quality tools for collaboration and reproducible research such as R and Github is becoming more common in many research fields. While Github and other version management systems are excellent resources, they were originally designed to handle code and scale poorly to large text-based or binary datasets. A number of scientific data repositories are coming online and are often focused on dataset archival and publication. To handle collaborative workflows using large scientific datasets, there is increasing need to connect cloud-based online data storage to R. In this article, we describe how the new R package sbtools enables direct access to the advanced online data functionality provided by ScienceBase, the U.S. Geological Survey’s online scientific data storage platform.

  7. The Open Anatomy Browser: A Collaborative Web-Based Viewer for Interoperable Anatomy Atlases

    Science.gov (United States)

    Halle, Michael; Demeusy, Valentin; Kikinis, Ron

    2017-01-01

    The Open Anatomy Browser (OABrowser) is an open source, web-based, zero-installation anatomy atlas viewer based on current web browser technologies and evolving anatomy atlas interoperability standards. OABrowser displays three-dimensional anatomical models, image cross-sections of labeled structures and source radiological imaging, and a text-based hierarchy of structures. The viewer includes novel collaborative tools: users can save bookmarks of atlas views for later access and exchange those bookmarks with other users, and dynamic shared views allow groups of users can participate in a collaborative interactive atlas viewing session. We have published several anatomy atlases (an MRI-derived brain atlas and atlases of other parts of the anatomy) to demonstrate OABrowser’s functionality. The atlas source data, processing tools, and the source for OABrowser are freely available through GitHub and are distributed under a liberal open source license.

  8. Collaboration With Urban Parents to Deliver a Community-Based Youth HIV Prevention Program.

    Science.gov (United States)

    Chowdhury, Jenifar; Alicea, Stacey; Jackson, Jerrold M; Elwyn, Laura; Rivera-Rodriguez, Anita; Miranda, Ana; Watson, Janet; McKay, Mary M

    2013-01-01

    This article draws on the unified theory of behavior change to examine adult community members' participation in a collaborative, community-based HIV prevention program for inner-city youth. Specifically, the impact of a training and mentorship process is examined with a sample of parent facilitators hired to deliver an evidence-based HIV prevention program in Bronx, New York. Findings indicate that the training program impacted four of five key constructs (environmental constraints, habitual behavior, social norms, and self-concept) expected to be related to parents' ability to deliver the program constructs significantly beyond any increase evidenced by the control group (HIV knowledge increased in both groups). Community-level training programs may therefore be an effective medium for increasing caregivers' intention to collaborate in community-based prevention programs.

  9. The bumpy light curve of Type IIn supernova iPTF13z over 3 years

    Science.gov (United States)

    Nyholm, A.; Sollerman, J.; Taddia, F.; Fremling, C.; Moriya, T. J.; Ofek, E. O.; Gal-Yam, A.; De Cia, A.; Roy, R.; Kasliwal, M. M.; Cao, Y.; Nugent, P. E.; Masci, F. J.

    2017-08-01

    A core-collapse (CC) supernova (SN) of Type IIn is dominated by the interaction of SN ejecta with the circumstellar medium (CSM). Some SNe IIn (e.g. SN 2006jd) have episodes of re-brightening ("bumps") in their light curves. We present iPTF13z, a Type IIn SN discovered on 2013 February 1 by the intermediate Palomar Transient Factory (iPTF). This SN showed at least five bumps in its declining light curve between 130 and 750 days after discovery. We analyse this peculiar behaviour and try to infer the properties of the CSM, of the SN explosion, and the nature of the progenitor star. We obtained multi-band optical photometry for over 1000 days after discovery with the P48 and P60 telescopes at Palomar Observatory. We obtained low-resolution optical spectra during the same period. We did an archival search for progenitor outbursts. We analyse the photometry and the spectra, and compare iPTF13z to other SNe IIn. In particular we derive absolute magnitudes, colours, a pseudo-bolometric light curve, and the velocities of the different components of the spectral lines. A simple analytical model is used to estimate the properties of the CSM. iPTF13z had a light curve peaking at Mr ≲ - 18.3 mag. The five bumps during its decline phase had amplitudes ranging from 0.4 to 0.9 mag and durations between 20 and 120 days. The most prominent bumps appeared in all the different optical bands, when covered. The spectra of this SN showed typical SN IIn characteristics, with emission lines of Hα (with broad component FWHM 103 - 104 km s-1 and narrow component FWHM 102 km s-1) and He i, but also with Fe ii, Ca ii, Na i D and Hβ P Cygni profiles (with velocities of 103km s-1). A pre-explosion outburst was identified lasting ≳ 50 days, with Mr ≈ - 15 mag around 210 days before discovery. Large, variable progenitor mass-loss rates (≳0.01M⊙ yr-1) and CSM densities (≳10-16 g cm-3) are derived. The SN was hosted by a metal-poor dwarf galaxy at redshift z = 0.0328. We suggest that

  10. Collaborative Learning with Screen-Based Simulation in Health Care Education: An Empirical Study of Collaborative Patterns and Proficiency Development

    Science.gov (United States)

    Hall, L. O.; Soderstrom, T.; Ahlqvist, J.; Nilsson, T.

    2011-01-01

    This article is about collaborative learning with educational computer-assisted simulation (ECAS) in health care education. Previous research on training with a radiological virtual reality simulator has indicated positive effects on learning when compared to a more conventional alternative. Drawing upon the field of Computer-Supported…

  11. Collaborative Service Arrangements

    DEFF Research Database (Denmark)

    Winter, Søren; J. May, Peter

    2007-01-01

    in particular differs among collaborators. Our modeling of the influence of collaboration on perceived employment outcomes suggests that these impacts are relatively minor. They are greater when there is active involvement of municipal employment managers in fostering cooperative relationships...... with collaborators. In short, collaboration requires a healthy and active relationship to foster improved outcomes. These findings have implications for future research about collaborative service delivery concerning the measurement of collaboration, different bases for it, and potential impacts....

  12. Collaborative Service Arrangements

    DEFF Research Database (Denmark)

    J. May, Peter; Winter, Søren

    in particular differs among collaborators. Our modeling of the influence of collaboration on perceived employment outcomes suggests that these impacts are relatively minor. They are greater when there is active involvement of municipal employment managers in fostering cooperative relationships...... with collaborators. In short, collaboration requires a healthy and active relationship to foster improved outcomes. These findings have implications for future research about collaborative service delivery concerning the measurement of collaboration, different bases for it, and potential impacts....

  13. Collaborative Service Arrangements

    DEFF Research Database (Denmark)

    J. May, Peter; Winter, Søren

    While much of prior research on collaboration addresses the service delivery network as a whole, we address collaborative relationships between one type of organization—municipal employment services—and a range of governmental and non-governmental partners for employment services in Denmark...... with collaborators. In short, collaboration requires a healthy and active relationship to foster improved outcomes. These findings have implications for future research about collaborative service delivery concerning the measurement of collaboration, different bases for it, and potential impacts....

  14. Adaptive Optics and planned HST follow-up observations of the strongly lensed SNIa iPTF16geu

    Science.gov (United States)

    Goobar, Ariel; Amanullah, Rahman; Kulkarni, Shri; Steidel, Charles; Law, David

    2016-10-01

    Adaptive optics (AO) observations of iPTF16geu (ATel #9603) were carried out on October 11 with NACO in Natural Guide Star (NGS) mode on VLT. A bright star 30" SE of the SN position provided for the AO corrections.

  15. Interpreting the Strongly Lensed Supernova iPTF16geu: Time Delay Predictions, Microlensing, and Lensing Rates

    Science.gov (United States)

    More, Anupreeta; Suyu, Sherry H.; Oguri, Masamune; More, Surhud; Lee, Chien-Hsiu

    2017-02-01

    We present predictions for time delays between multiple images of the gravitationally lensed supernova, iPTF16geu, which was recently discovered from the intermediate Palomar Transient Factory (iPTF). As the supernova is of Type Ia where the intrinsic luminosity is usually well known, accurately measured time delays of the multiple images could provide tight constraints on the Hubble constant. According to our lens mass models constrained by the Hubble Space Telescope F814W image, we expect the maximum relative time delay to be less than a day, which is consistent with the maximum of 100 hr reported by Goobar et al. but places a stringent upper limit. Furthermore, the fluxes of most of the supernova images depart from expected values suggesting that they are affected by microlensing. The microlensing timescales are small enough that they may pose significant problems to measure the time delays reliably. Our lensing rate calculation indicates that the occurrence of a lensed SN in iPTF is likely. However, the observed total magnification of iPTF16geu is larger than expected, given its redshift. This may be a further indication of ongoing microlensing in this system.

  16. Optical photometry and spectroscopy of the low-luminosity, broad-lined Ic supernova iPTF15dld

    DEFF Research Database (Denmark)

    Pian, E.; Tomasella, L.; Cappellaro, E.

    2017-01-01

    Core-collapse stripped-envelope supernova (SN) explosions reflect the diversity of physical parameters and evolutionary paths of their massive star progenitors. We have observed the Type Ic SN iPTF15dld (z = 0.047), reported by the Palomar Transient Factory. Spectra were taken starting 20 rest...

  17. Supporting interoperability of collaborative networks through engineering of a service-based Mediation Information System (MISE 2.0)

    Science.gov (United States)

    Benaben, Frederick; Mu, Wenxin; Boissel-Dallier, Nicolas; Barthe-Delanoe, Anne-Marie; Zribi, Sarah; Pingaud, Herve

    2015-08-01

    The Mediation Information System Engineering project is currently finishing its second iteration (MISE 2.0). The main objective of this scientific project is to provide any emerging collaborative situation with methods and tools to deploy a Mediation Information System (MIS). MISE 2.0 aims at defining and designing a service-based platform, dedicated to initiating and supporting the interoperability of collaborative situations among potential partners. This MISE 2.0 platform implements a model-driven engineering approach to the design of a service-oriented MIS dedicated to supporting the collaborative situation. This approach is structured in three layers, each providing their own key innovative points: (i) the gathering of individual and collaborative knowledge to provide appropriate collaborative business behaviour (key point: knowledge management, including semantics, exploitation and capitalisation), (ii) deployment of a mediation information system able to computerise the previously deduced collaborative processes (key point: the automatic generation of collaborative workflows, including connection with existing devices or services) (iii) the management of the agility of the obtained collaborative network of organisations (key point: supervision of collaborative situations and relevant exploitation of the gathered data). MISE covers business issues (through BPM), technical issues (through an SOA) and agility issues of collaborative situations (through EDA).

  18. Ontology-Based User Profiling for Personalized Acces to Information within Collaborative Learning System

    Directory of Open Access Journals (Sweden)

    Mohammed Amine Alimam

    2014-06-01

    Full Text Available The use of modern educational technology methods has become an important area of research in order to support learning as well as collaboration. This is especially evident with the rise of internet and web 2.0 platforms that have transformed users’ role from mere content consumers to fully content consumers-producers. Furthermore, people engaged in collaborative learning capitalize on one another’s resources and skills, unlike individual learning. This paper proceeds with a categorization of the main tools and functions that characterize the personalization learning aspect, in order to discuss their trade-offs with collaborative learning systems. It proposes a framework of a personalized information research (IR within a collaborative learning system, incorporating the characterization of the research type carried by the query, as well as modeling and constructing semantic users’ profiles. We use the context of the user query into a prediction mechanism of the search type, based on a previous identification of users’ levels and interests. The paper is concluded by presenting experiment results, revealing that the use of the subject ontology extension approach satisfyingly contributes to improvement in the accuracy of system recommendations.

  19. Conceptual design of collaborative virtual environments for education using a theater-based metaphor

    Directory of Open Access Journals (Sweden)

    Alberto Bucciero

    2011-09-01

    Full Text Available Collaborative Virtual Environments (CVEs are becoming more and more important in many areas because they offer users the opportunity to experiment with novel interaction paradigms in order to perform collaborative work or have engaging experiences ‘being together’. One of the most promising application fields is eLearning, where CVEs give the unique opportunity to explore effective educational formats. Surprisingly, if compared with other more traditional fields as software engineering and database, we note a lack of design approaches. We point out that a well-founded design approach is crucial to develop collaborative experiences that could generate substantial and measurable educational benefits. To meet this challenge, in this paper we present a set of founding concepts that enable pedagogs and teachers designing effective 3D virtual worlds for education. To keep our concepts simply understandable, we based our design method on a widespread metaphor: the theater. We demonstrate through a real case study the promising advantages of our approach: expressiveness to capture collaborative features at a high level of abstraction, semi-formality to facilitate the establishment of a common ground between educational designers and CVEs engineers, and guidance to enable non-experts to cope with all the relevant aspects of a 3D virtual world.

  20. A multi-wavelength investigation of the radio-loud supernova PTF11qcj and its circumstellar environment

    Energy Technology Data Exchange (ETDEWEB)

    Corsi, A. [Department of Physics, The George Washington University, 725 21st St, NW, Washington, DC 20052 (United States); Ofek, E. O.; Gal-Yam, A.; Xu, D. [Benoziyo Center for Astrophysics, Weizmann Institute of Science, 76100 Rehovot (Israel); Frail, D. A. [National Radio Astronomy Observatory, P.O. Box O, Socorro, NM 87801 (United States); Kulkarni, S. R.; Horesh, A.; Carpenter, J.; Arcavi, I.; Cao, Y.; Mooley, K.; Sesar, B. [Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, CA 91125 (United States); Fox, D. B. [Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802 (United States); Kasliwal, M. M. [Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101 (United States); Sullivan, M.; Maguire, K.; Pan, Y.-C. [Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH (United Kingdom); Cenko, S. B. [NASA Goddard Space Flight Center, Code 685, Greenbelt, MD 20771 (United States); Sternberg, A. [Max-Planck-Institut fur Astrophysik, D-85741 Garching (Germany); Bersier, D., E-mail: corsi@gwu.edu [Astrophysics Research Institute, Liverpool John Moores University, Liverpool (United Kingdom); and others

    2014-02-10

    We present the discovery, classification, and extensive panchromatic (from radio to X-ray) follow-up observations of PTF11qcj, a supernova (SN) discovered by the Palomar Transient Factory (PTF). Our observations with the Karl G. Jansky Very Large Array show that this event is radio-loud: PTF11qcj reached a radio peak luminosity comparable to that of the famous gamma-ray-burst-associated SN 1998bw (L {sub 5} {sub GHz} ≈ 10{sup 29} erg s{sup –1} Hz{sup –1}). PTF11qcj is also detected in X-rays with the Chandra Observatory, and in the infrared band with Spitzer. Our multi-wavelength analysis probes the SN interaction with circumstellar material. The radio observations suggest a progenitor mass-loss rate of ∼10{sup –4} M {sub ☉} yr{sup –1} × (v{sub w} /1000 km s{sup –1}), and a velocity of ≈0.3-0.5 c for the fastest moving ejecta (at ≈10 days after explosion). However, these estimates are derived assuming the simplest model of SN ejecta interacting with a smooth circumstellar wind, and do not account for possible inhomogeneities in the medium and asphericity of the explosion. The radio data show deviations from such a simple model, as well as a late-time re-brightening. The X-ray flux from PTF11qcj is compatible with the high-frequency extrapolation of the radio synchrotron emission (within the large uncertainties). A light echo from pre-existing dust is in agreement with our infrared data. Our pre-explosion data from the PTF suggest that a precursor eruption of absolute magnitude M{sub r} ≈ –13 mag may have occurred ≈2.5 yr prior to the SN explosion. Overall, PTF11qcj fits the expectations from the explosion of a Wolf-Rayet star. Precursor eruptions may be a feature characterizing the final pre-explosion evolution of such stars.

  1. Evaluation of a Collaborative Teacher Education Program: Planning and Development of School-Based Preservice and Inservice Teacher Education. Phase IV.

    Science.gov (United States)

    Schumacher, Sally; Rommel-Esham, Kathryn

    The Richmond City Public Schools-Virginia Commonweath University Collaborative Teacher Education Program (CoTEEP) is a collaborative integration of preservice and inservice teacher education. Phase IV of this program (1985-1986) planned and developed collaboration in school-based preservice education and continued prior collaboration in inservice…

  2. A web-based 3D medical image collaborative processing system with videoconference

    Science.gov (United States)

    Luo, Sanbi; Han, Jun; Huang, Yonggang

    2013-07-01

    Three dimension medical images have been playing an irreplaceable role in realms of medical treatment, teaching, and research. However, collaborative processing and visualization of 3D medical images on Internet is still one of the biggest challenges to support these activities. Consequently, we present a new application approach for web-based synchronized collaborative processing and visualization of 3D medical Images. Meanwhile, a web-based videoconference function is provided to enhance the performance of the whole system. All the functions of the system can be available with common Web-browsers conveniently, without any extra requirement of client installation. In the end, this paper evaluates the prototype system using 3D medical data sets, which demonstrates the good performance of our system.

  3. Maximum Spanning Tree Model on Personalized Web Based Collaborative Learning in Web 3.0

    CERN Document Server

    Padma, S

    2012-01-01

    Web 3.0 is an evolving extension of the current web environme bnt. Information in web 3.0 can be collaborated and communicated when queried. Web 3.0 architecture provides an excellent learning experience to the students. Web 3.0 is 3D, media centric and semantic. Web based learning has been on high in recent days. Web 3.0 has intelligent agents as tutors to collect and disseminate the answers to the queries by the students. Completely Interactive learner's query determine the customization of the intelligent tutor. This paper analyses the Web 3.0 learning environment attributes. A Maximum spanning tree model for the personalized web based collaborative learning is designed.

  4. Feminist Interruptions: Creating Care-ful and Collaborative Community-Based Research with Students

    Directory of Open Access Journals (Sweden)

    Kelly Concannon

    2014-05-01

    Full Text Available This article describes a feminist community-based research project involving faculty and student collaboration to evaluate a dating and domestic violence awareness initiative. Using a critical ethics of care that emphasizes relationships and allows for constant reflection about power dynamics, role, positionality, and emotions, the authors reflect on what was learned during the research process. Faculty and student researchers share their perspectives and offer suggestions for future feminist collaborative research projects. Significant lessons learned include ensuring that all are invested from the outset of the project, guaranteeing that student researchers understand why their role is so critical in community-based research, and acknowledging not just faculty power over students but student privilege as well.

  5. ELECTRONIC COLLABORATION ACROSS CULTURES IN A WEB-BASED PROJECT FOR ENGLISH WRITING INSTRUCTION

    OpenAIRE

    George C.K. Jor

    2000-01-01

    The paper highlights the importance of experimentation and an innovative approach to English language writing instruction with the help of information communication technology (ICT or IT). First, it describes the local situation of English language teaching at The Chinese University of Hong Kong (CUHK). Then, it summarizes the development of IT proficiency and student-led collaborative learning groups at CUHK. Third, it reports on an international Web-based writing project involving six colla...

  6. A Distributed Software Architecture for Collaborative Teleoperation based on a VR Platform and Web Application Interoperability

    OpenAIRE

    2008-01-01

    International audience; Augmented Reality and Virtual Reality can provide to a Human Operator (HO) a real help to complete complex tasks, such as robot teleoperation and cooperative teleassistance. Using appropriate augmentations, the HO can interact faster, safer and easier with the remote real world. In this paper, we present an extension of an existing distributed software and network architecture for collaborative teleoperation based on networked human-scaled mixed reality and mobile plat...

  7. A CMS-based tool for continuous and collaborative risk management process.

    OpenAIRE

    Gabriel Negreira Barbosa

    2009-01-01

    A Security Risk Management Process is an important part for any approach to software security. To be effective, this process should address some issues, like the analysis of different risks and related safeguards, continuous collaboration among involved professionals, and a robust access control mechanism due to the sensitivity of the involved information. In this research, it was developed a solution for security risk management based on an open-source CMS (Content Management System). This t...

  8. Applying activity theory to computer-supported collaborative learning and work-based activities in corporate settings

    NARCIS (Netherlands)

    Collis, Betty; Margaryan, Anoush

    2004-01-01

    Business needs in many corporations call for learning outcomes that involve problem solutions, and creating and sharing new knowledge within worksplace situation that may involve collaboration among members of a team. We argue that work-based activities (WBA) and computer-supported collaborative lea

  9. The Comparison of Solitary and Collaborative Modes of Game-Based Learning on Students' Science Learning and Motivation

    Science.gov (United States)

    Chen, Ching-Huei; Wang, Kuan-Chieh; Lin, Yu-Hsuan

    2015-01-01

    In this study, we investigated and compared solitary and collaborative modes of game-based learning in promoting students' science learning and motivation. A total of fifty seventh grade students participated in this study. The results showed that students who played in a solitary or collaborative mode demonstrated improvement in learning…

  10. Applying Activity Theory to Computer-Supported Collaborative Learning and Work-Based Activities in Corporate Settings

    Science.gov (United States)

    Collis, Betty; Margaryan, Anoush

    2004-01-01

    Business needs in many corporations call for learning outcomes that involve problem solutions, and creating and sharing new knowledge within workplace situations that may involve collaboration among members of a team. We argue that work-based activities (WBA) and computer-supported collaborative learning (CSCL) are appropriate components for…

  11. The Comparison of Solitary and Collaborative Modes of Game-Based Learning on Students' Science Learning and Motivation

    Science.gov (United States)

    Chen, Ching-Huei; Wang, Kuan-Chieh; Lin, Yu-Hsuan

    2015-01-01

    In this study, we investigated and compared solitary and collaborative modes of game-based learning in promoting students' science learning and motivation. A total of fifty seventh grade students participated in this study. The results showed that students who played in a solitary or collaborative mode demonstrated improvement in learning…

  12. Towards a Personalised, Learning Style Based Collaborative Blended Learning Model with Individual Assessment

    Directory of Open Access Journals (Sweden)

    Ilona BÉRES

    2012-04-01

    Full Text Available In this paper we aim to describe the process by which our personalised web-based collaborative teaching/learning methodology (CECIP - Collaboration - Evaluation - Critical thinking - Individual assessment - learner Profile evolved originating from Vygotsky's theory and based on the (C collaborative construction of student's knowledge, (E developing evaluation and assessment skills, (C developing critical thinking skills, (I integrating individual evaluation and (P generating learner profile. Our CECIP methodology integrates individual learning style dimensions and their preferences into e-learning environment by filling out MBTI, Gardner, GEFT and Felder-Silverman questionnaires during our four-semester-research. The paper covers the theoretical foundations of Learning Styles giving analogies to preferred learning strategies. A three-part-research process is described through which the described CECIP model emerged: (1 analysing Learning Styles and Learning Management Systems that claim to support their work; (2 raising the background knowledge of students in cognitive psychology in order to improve design and evaluation methodologies of multimedia learning materials; (3 personalising tasks and assessment based on Bloom's Taxonomy.

  13. Evolutionary Game Theory-Based Collaborative Sensing Model in Emergency CRAHNs

    Directory of Open Access Journals (Sweden)

    Sasirekha GVK

    2012-01-01

    Full Text Available Game theory has been a tool of choice for modeling dynamic interactions between autonomous systems. Cognitive radio ad hoc networks (CRAHNs constituted of autonomous wireless nodes are a natural fit for game theory-based modeling. The game theory-based model is particularly suitable for “collaborative spectrum sensing” where each cognitive radio senses the spectrum and shares the results with other nodes such that the targeted sensing accuracy is achieved. Spectrum sensing in CRAHNs, especially when used in emergency scenarios such as disaster management and military applications, needs to be not only accurate and resource efficient, but also adaptive to the changing number of users as well as signal-to-noise ratios. In addition, spectrum sensing mechanism must also be proactive, fair, and tolerant to security attacks. Existing work in collaborative spectrum sensing has mostly been confined to resource efficiency in static systems using request-based reactive sensing resulting in high latencies. In this paper, evolutionary game theory (EGT is used to model the behavior of the emergency CRAHNS, providing an efficient model for collaborative spectrum sensing. The resulting implementation model is adaptive to the changes in its environment such as signal-to-noise ratio and number of users in the network. The analytical and simulation models presented validate the system design and the desired performance.

  14. Wiki Laboratory Notebooks: Supporting Student Learning in Collaborative Inquiry-Based Laboratory Experiments

    Science.gov (United States)

    Lawrie, Gwendolyn Angela; Grøndahl, Lisbeth; Boman, Simon; Andrews, Trish

    2016-06-01

    Recent examples of high-impact teaching practices in the undergraduate chemistry laboratory that include course-based undergraduate research experiences and inquiry-based experiments require new approaches to assessing individual student learning outcomes. Instructors require tools and strategies that can provide them with insight into individual student contributions to collaborative group/teamwork throughout the processes of experimental design, data analysis, display and communication of their outcomes in relation to their research question(s). Traditional assessments in the form of laboratory notebooks or experimental reports provide limited insight into the processes of collaborative inquiry-based activities. A wiki environment offers a collaborative domain that can potentially support collaborative laboratory processes and scientific record keeping. In this study, the effectiveness of the wiki in supporting laboratory learning and assessment has been evaluated through analysis of the content and histories for three consenting, participating groups of students. The conversational framework has been applied to map the relationships between the instructor, tutor, students and laboratory activities. Analytics that have been applied to the wiki platform include: character counts, page views, edits, timelines and the extent and nature of the contribution by each student to the wiki. Student perceptions of both the role and the impact of the wiki on their experiences and processes have also been collected. Evidence has emerged from this study that the wiki environment has enhanced co-construction of understanding of both the experimental process and subsequent communication of outcomes and data. A number of features are identified to support success in the use of the wiki platform for laboratory notebooks.

  15. Virtual images inspired consolidate collaborative representation-based classification method for face recognition

    Science.gov (United States)

    Liu, Shigang; Zhang, Xinxin; Peng, Yali; Cao, Han

    2016-07-01

    The collaborative representation-based classification method performs well in the field of classification of high-dimensional images such as face recognition. It utilizes training samples from all classes to represent a test sample and assigns a class label to the test sample using the representation residuals. However, this method still suffers from the problem that limited number of training sample influences the classification accuracy when applied to image classification. In this paper, we propose a modified collaborative representation-based classification method (MCRC), which exploits novel virtual images and can obtain high classification accuracy. The procedure to produce virtual images is very simple but the use of them can bring surprising performance improvement. The virtual images can sufficiently denote the features of original face images in some case. Extensive experimental results doubtlessly demonstrate that the proposed method can effectively improve the classification accuracy. This is mainly attributed to the integration of the collaborative representation and the proposed feature-information dominated virtual images.

  16. A Web-based Collaborative System Framework for Green Building Certification

    Directory of Open Access Journals (Sweden)

    Jack C.P. Cheng

    2013-11-01

    Full Text Available The built environment is moving towards sustainable development and the number of green buildings increased worldwide in recent years. Green buildings are environmentally, socially and economically desirable; however the certification of green buildings is often expensive and labor-intensive. The document preparation and review process for green building certification is iterative in nature and requires the collaboration of many project participants, certification organizations and third party engineering consultants. This paper aims at developing a system framework that can assist the green building certification process. Different certification standards have been studied and their scope and credit calculation were compared to understand the requirements of the system framework. Based on the study, the required features were designed as follows, (1 role-based access control, (2 document manager and related document discovery, (3 workflow manager, (4 credit manager, and (5 knowledge manager. The features of the system provide a collaborative environment and reduce repetitive works commonly occurring in manual processes. The features of the system framework are discussed and illustrated considering the Hong Kong BEAM Plus standard. This paper also describes how the system framework enhances collaboration in the certification process

  17. An Extended Non-Lane-Based Optimal Velocity Model with Dynamic Collaboration

    Directory of Open Access Journals (Sweden)

    Zhipeng Li

    2013-01-01

    Full Text Available Incorporating the effects of the lane width in traffic, in this paper, we propose a dynamical model based on the strategy of three-vehicle cooperation driving. We obtain the smoother acceleration distribution in the new model through considering the dynamic collaboration with the nearest preceding vehicle and the nearest following vehicle. It is proved that the stability of the new model is greatly improved compared to the early non-lane-based car following model by using the linear stability theory. We find that when the parameter of lateral separation distance is identified, the amplitude of traffic congestion decreases with increasing the strength of dynamic collaboration in the simulation experiments. In addition, we apply the new extended model to simulate the motions of cars starting from a traffic signal and the dissipating of the traffic congestion; it is found that our new model can predict realistic delay time and kinematic wave speed and obtained a faster dissipation speed of traffic congestion than the traffic flow model without considering the dynamic collaboration.

  18. An Evolutionary Algorithm of the Regional Collaborative Innovation Based on Complex Network

    Directory of Open Access Journals (Sweden)

    Kun Wang

    2016-01-01

    Full Text Available This paper proposed a new perspective to study the evolution of regional collaborative innovation based on complex network theory. The two main conceptions of evolution, “graph with dynamic features” and “network evolution,” have been provided in advance. Afterwards, we illustrate the overall architecture and capability model of the regional collaborative innovation system, which contains several elements and participants. Therefore, we can definitely assume that the regional collaborative innovation system could be regarded as a complex network model. In the proposed evolutionary algorithm, we consider that each node in the network could only connect to less than a certain amount of neighbors, and the extreme value is determined by its importance. Through the derivation, we have created a probability density function as the most important constraint and supporting condition of our simulation experiments. Then, a case study was performed to explore the network topology and validate the effectiveness of our algorithm. All the raw datasets were obtained from the official website of the National Bureau of Statistic of China and some other open sources. Finally, some meaningful recommendations were presented to policy makers, especially based on the experimental results and some common conclusions of complex networks.

  19. A Collaborative Process of Decision Making in the Business Context based on Online Questionnaires

    Directory of Open Access Journals (Sweden)

    Rhizlane Seltani

    2016-07-01

    Full Text Available This article is a component of a series of articles and scientific researches conducted by the research team which deals with the web 2.0 and its interactions with the different technology areas. During recent years, the emergence of the web 2.0 has revolutionized the world of new technologies, in particular the business intelligence field, providing businesses with new and innovative ways to make use of information in order to improve their overall performance. This article comes to consolidate the profit which can be taken from the new technologies of the web 2.0, especially blogs which constitute a valuable mean to gather exchanged information and results of the collaboration between users, by offering a new collaborative tool for decision making based on online questionnaires in order to exploit the collective intelligence which represents a very important source of significant data, and by adopting the SCAMMPERR method, a creative technique of stimulation of ideas and problem solving. This paper presents a practical innovation in the computing level and makes an impact on the economic and the organizational sides of the enterprise, by proposing a new methodology based on the SCAMMPERR technique and supported by the strengths of the web 2.0 to ensure a collaborative decision making. As a result, it provides relevant decisions which support the traditional decision support systems.

  20. Collaborative processes in species identification using an internet-based taxonomic resource

    Science.gov (United States)

    Kontkanen, Jani; Kärkkäinen, Sirpa; Dillon, Patrick; Hartikainen-Ahia, Anu; Åhlberg, Mauri

    2016-01-01

    Visual databases are increasingly important resources through which individuals and groups can undertake species identification. This paper reports research on the collaborative processes undertaken by pre-service teacher students when working in small groups to identify birds using an Internet-based taxonomic resource. The student groups are conceptualised as 'knowledge-building communities' working in a 'joint problem space' comprising the collective knowledge of the participants interacting with the taxonomic database. Collaborative group work and associated dialogue were recorded with digital video. The recordings were analysed for the categories of dialogue and the categories of knowledge used by the students as they interacted with the taxonomic database and how they drew on their previous experiences of identifying birds. The outcomes are discussed in the context of the interplay of individual and social processes and the interplay between abstraction and lived experience in the joint problem space.

  1. [Teaching Desktop] Video Conferencing in a Collaborative and Problem Based Setting

    DEFF Research Database (Denmark)

    Ørngreen, Rikke; Mouritzen, Per

    2013-01-01

    This paper presents experiences from teaching video conferencing for learning and collaboration, and discusses the challenges and potentials of applying a collaborative and problem‐based learning (PBL) pedagogy. The research is an action research study, and we as researchers, educational planners......, teachers and assistant teachers wanted to find ways in the design for learning that enables the learners to acquire knowledge about the theories, models and concepts of the subject, as well as hands‐on competencies in a learning‐by‐doing manner. In particular we address the area of desktop video...... shows that the students experiment with various pedagogical situations, and that during the process of design, teaching, and reflection they acquire experiences at both a concrete specific and a general abstract level. The desktop video conference system creates challenges, with technical issues...

  2. A Collaborative System Software Solution for Modeling Business Flows Based on Automated Semantic Web Service Composition

    Directory of Open Access Journals (Sweden)

    Ion SMEUREANU

    2009-01-01

    Full Text Available Nowadays, business interoperability is one of the key factors for assuring competitive advantage for the participant business partners. In order to implement business cooperation, scalable, distributed and portable collaborative systems have to be implemented. This article presents some of the mostly used technologies in this field. Furthermore, it presents a software application architecture based on Business Process Modeling Notation standard and automated semantic web service coupling for modeling business flow in a collaborative manner. The main business processes will be represented in a single, hierarchic flow diagram. Each element of the diagram will represent calls to semantic web services. The business logic (the business rules and constraints will be structured with the help of OWL (Ontology Web Language. Moreover, OWL will also be used to create the semantic web service specifications.

  3. Collaborative filtering algorithm based on Forgetting Curve and Long Tail theory

    Science.gov (United States)

    Qi, Shen; Li, Shiwei; Zhou, Hao

    2017-03-01

    The traditional collaborative filtering algorithm only pays attention to the rating by users. In reality, however, user and item information is always changing with time flying. Therefore, recommendation systems need to take time-varying changes into consideration. The collaborative filtering algorithm which is based on Forgetting Curve and Long Tail theory (FCLT) is introduced for the above problems. The following two points are discussed depending on the problem: First, the user-item rating matrix can update in real time by forgetting curve; secondly, according to the Long Tail theory and item popularity, a further similarity calculation method is obtained. The experimental results demonstrated that the proposed algorithm can effectively improve the recommendation accuracy and alleviate the Long Tail effect.

  4. Collaborative development of knowledge-based support systems: a case study.

    Science.gov (United States)

    Lindgren, Helena; Winnberg, Patrik J; Yan, Chunli

    2012-01-01

    We investigate a user-driven collaborative knowledge engineering and interaction design process. The outcome is a knowledge-based support application tailored to physicians in the local dementia care community. The activity is organized as a part of a collaborative effort between different organizations to develop their local clinical practice. Six local practitioners used the generic decision-support prototype system DMSS-R developed for the dementia domain during a period and participated in evaluations and re-design. Additional two local domain experts and a domain expert external to the local community modeled the content and design of DMSS-R by using the modeling system ACKTUS. Obstacles and success factors occurring when enabling the end-users to design their own tools are detected and interpreted using a proposed framework for improving care through the use of clinical guidelines. The results are discussed.

  5. [A brief review of research on chronic disease management based on collaborative care model in China].

    Science.gov (United States)

    Li, Huayan; Fuller, Jeffrey; Sun, Mei; Wang, Yong; Xu, Shuang; Feng, Hui

    2014-11-01

    To evaluate the situation for chronic disease management in China, and to seek the method for improving the collaborative management for chronic diseases in community. We searched literature between January 2008 and November 2013 from the Database, such as China Academic Journal Full-Text Database, and PubMed. The screening was strictly in accordance with the inclusion and exclusion criteria and a summary was made among the selected literature based on a collaboration model. We got 698 articles after rough screen and finally selected 33. All studies were involved in patient's self-management support, but only 9 studies mentioned the communication within the team, and 11 showed a clear team division of labor. Chronic disease community management in China displays some disadvantages. It really needs a general service team with clear roles and responsibilities for team members to improve the service ability of team members and provide patients with various forms of self management services.

  6. A comparative study: classification vs. user-based collaborative filtering for clinical prediction

    Directory of Open Access Journals (Sweden)

    Fang Hao

    2016-12-01

    Full Text Available Abstract Background Recommender systems have shown tremendous value for the prediction of personalized item recommendations for individuals in a variety of settings (e.g., marketing, e-commerce, etc.. User-based collaborative filtering is a popular recommender system, which leverages an individuals’ prior satisfaction with items, as well as the satisfaction of individuals that are “similar”. Recently, there have been applications of collaborative filtering based recommender systems for clinical risk prediction. In these applications, individuals represent patients, and items represent clinical data, which includes an outcome. Methods Application of recommender systems to a problem of this type requires the recasting a supervised learning problem as unsupervised. The rationale is that patients with similar clinical features carry a similar disease risk. As the “Big Data” era progresses, it is likely that approaches of this type will be reached for as biomedical data continues to grow in both size and complexity (e.g., electronic health records. In the present study, we set out to understand and assess the performance of recommender systems in a controlled yet realistic setting. User-based collaborative filtering recommender systems are compared to logistic regression and random forests with different types of imputation and varying amounts of missingness on four different publicly available medical data sets: National Health and Nutrition Examination Survey (NHANES, 2011-2012 on Obesity, Study to Understand Prognoses Preferences Outcomes and Risks of Treatment (SUPPORT, chronic kidney disease, and dermatology data. We also examined performance using simulated data with observations that are Missing At Random (MAR or Missing Completely At Random (MCAR under various degrees of missingness and levels of class imbalance in the response variable. Results Our results demonstrate that user-based collaborative filtering is consistently inferior

  7. A comparative study: classification vs. user-based collaborative filtering for clinical prediction.

    Science.gov (United States)

    Hao, Fang; Blair, Rachael Hageman

    2016-12-08

    Recommender systems have shown tremendous value for the prediction of personalized item recommendations for individuals in a variety of settings (e.g., marketing, e-commerce, etc.). User-based collaborative filtering is a popular recommender system, which leverages an individuals' prior satisfaction with items, as well as the satisfaction of individuals that are "similar". Recently, there have been applications of collaborative filtering based recommender systems for clinical risk prediction. In these applications, individuals represent patients, and items represent clinical data, which includes an outcome. Application of recommender systems to a problem of this type requires the recasting a supervised learning problem as unsupervised. The rationale is that patients with similar clinical features carry a similar disease risk. As the "Big Data" era progresses, it is likely that approaches of this type will be reached for as biomedical data continues to grow in both size and complexity (e.g., electronic health records). In the present study, we set out to understand and assess the performance of recommender systems in a controlled yet realistic setting. User-based collaborative filtering recommender systems are compared to logistic regression and random forests with different types of imputation and varying amounts of missingness on four different publicly available medical data sets: National Health and Nutrition Examination Survey (NHANES, 2011-2012 on Obesity), Study to Understand Prognoses Preferences Outcomes and Risks of Treatment (SUPPORT), chronic kidney disease, and dermatology data. We also examined performance using simulated data with observations that are Missing At Random (MAR) or Missing Completely At Random (MCAR) under various degrees of missingness and levels of class imbalance in the response variable. Our results demonstrate that user-based collaborative filtering is consistently inferior to logistic regression and random forests with different

  8. PTF 11kx: a type Ia supernova with a symbiotic nova progenitor.

    Science.gov (United States)

    Dilday, B; Howell, D A; Cenko, S B; Silverman, J M; Nugent, P E; Sullivan, M; Ben-Ami, S; Bildsten, L; Bolte, M; Endl, M; Filippenko, A V; Gnat, O; Horesh, A; Hsiao, E; Kasliwal, M M; Kirkman, D; Maguire, K; Marcy, G W; Moore, K; Pan, Y; Parrent, J T; Podsiadlowski, P; Quimby, R M; Sternberg, A; Suzuki, N; Tytler, D R; Xu, D; Bloom, J S; Gal-Yam, A; Hook, I M; Kulkarni, S R; Law, N M; Ofek, E O; Polishook, D; Poznanski, D

    2012-08-24

    There is a consensus that type Ia supernovae (SNe Ia) arise from the thermonuclear explosion of white dwarf stars that accrete matter from a binary companion. However, direct observation of SN Ia progenitors is lacking, and the precise nature of the binary companion remains uncertain. A temporal series of high-resolution optical spectra of the SN Ia PTF 11kx reveals a complex circumstellar environment that provides an unprecedentedly detailed view of the progenitor system. Multiple shells of circumstellar material are detected, and the SN ejecta are seen to interact with circumstellar material starting 59 days after the explosion. These features are best described by a symbiotic nova progenitor, similar to RS Ophiuchi.

  9. A Population of Short-Period Variable Quasars from PTF as Supermassive Black Hole Binary Candidates

    CERN Document Server

    Charisi, M; Haiman, Z; Price-Whelan, A M; Graham, M J; Bellm, E C; Laher, R R; Marka, S

    2016-01-01

    Supermassive black hole binaries (SMBHBs) at sub-parsec separations should be common in galactic nuclei, as a result of frequent galaxy mergers. Hydrodynamical simulations of circumbinary discs predict strong periodic modulation of the mass accretion rate on time-scales comparable to the orbital period of the binary. As a result, SMBHBs may be recognized by the periodic modulation of their brightness. We conducted a statistical search for periodic variability in a sample of 35,383 spectroscopically confirmed quasars in the photometric database of the Palomar Transient Factory (PTF). We analysed Lomb-Scargle periodograms and assessed the significance of our findings by modeling each individual quasar's variability as a damped random walk (DRW). We identified 50 quasars with significant periodicity beyond the DRW model, typically with short periods of a few hundred days. We find 33 of these to remain significant after a re-analysis of their periodograms including additional optical data from the intermediate-PT...

  10. PTF discovers and follows-up nearby, young, Type II supernova

    Science.gov (United States)

    Kasliwal, M. M.; Quimby, R. M.; Ofek, E. O.; Kulkarni, S. R.; Gal-Yam, A.; Arcavi, I.; Green, Y.; Walker, E.; Mazzali, P.; Nugent, P. E.; Poznanski, D.; Howell, D. A.; Dilday, B.; Fox, D. B.

    2010-09-01

    On UT 2010 Sep 15.243, the Palomar Transient Factory discovered an optical transient, PTF10vdl at RA(J2000) = 23:05:49.001 and DEC(J2000)=03:31:20.50 near NGC 7483. We obtained Target Of Opportunity spectra with Gemini-S/GMOS (PI Kasliwal) on Sep 16.29. The spectrum was extremely blue (f_nu proportional to nu^4.5) and nearly featureless. We further obtained a spectrum with the TNG/DOLORES (PI Walker) on Sep 17.40 and P-Cygni profiles of four Balmer lines were clearly visible, consistent with the redshift of NGC 7483, suggesting this is a Type II supernova.

  11. VLA and Swift XRT Observations of PTF12os in NGC 5806

    Science.gov (United States)

    Stockdale, C. J.; Immler, S.; Horesh, A.; Kasliwal, M.; Ryder, S. D.; Weiler, K. W.; Van Dyk, S. D.; Panagia, N.; Bauer, F. E.; Marcaide, J. M.; Pooley, D.; Sramek, R. A.; Williams, C. L.

    2012-01-01

    We report the detection of radio emission near the position of the type-IIb supernova PTF2012os (ATEL #3881) with the Karl G. Jansky Very Large Array radio telescope in the DnC configuration: A flux density of 0.44 ± 0.05 mJy was measured at 5.02 GHz (wavelength 6.0 cm) on 2012 Jan. 22.42 UT. The measured position of the radio emission of R.A. = 14h59m59.s12, Decl. = +01d53m23s.3, equinox 2000.0 is in good agreement with the measured optical position of (ending digits) R.A.

  12. A cloud computing based platform for sleep behavior and chronic diseases collaborative research.

    Science.gov (United States)

    Kuo, Mu-Hsing; Borycki, Elizabeth; Kushniruk, Andre; Huang, Yueh-Min; Hung, Shu-Hui

    2014-01-01

    The objective of this study is to propose a Cloud Computing based platform for sleep behavior and chronic disease collaborative research. The platform consists of two main components: (1) a sensing bed sheet with textile sensors to automatically record patient's sleep behaviors and vital signs, and (2) a service-oriented cloud computing architecture (SOCCA) that provides a data repository and allows for sharing and analysis of collected data. Also, we describe our systematic approach to implementing the SOCCA. We believe that the new cloud-based platform can provide nurse and other health professional researchers located in differing geographic locations with a cost effective, flexible, secure and privacy-preserved research environment.

  13. Supporting Problem Solving with Case-Stories Learning Scenario and Video-based Collaborative Learning Technology

    Directory of Open Access Journals (Sweden)

    Chun Hu

    2004-04-01

    Full Text Available In this paper, we suggest that case-based resources, which are used for assisting cognition during problem solving, can be structured around the work of narratives in social cultural psychology. Theories and other research methods have proposed structures within narratives and stories which may be useful to the design of case-based resources. Moreover, embedded within cases are stories which are contextually rich, supporting the epistemological groundings of situated cognition. Therefore the purposes of this paper are to discuss possible frameworks of case-stories; derive design principles as to “what” constitutes a good case story or narrative; and suggest how technology can support story-based learning. We adopt video-based Computer-Supported Collaborative Learning (CSCL technology to support problem solving with case-stories learning scenarios. Our hypothesis in this paper is that well-designed case-based resources are able to aid in the cognitive processes undergirding problem solving and meaning making. We also suggest the use of an emerging video-based collaborative learning technology to support such an instructional strategy.

  14. A web-based, collaborative modeling, simulation, and parallel computing environment for electromechanical systems

    Directory of Open Access Journals (Sweden)

    Xiaoliang Yin

    2015-03-01

    Full Text Available Complex electromechanical system is usually composed of multiple components from different domains, including mechanical, electronic, hydraulic, control, and so on. Modeling and simulation for electromechanical system on a unified platform is one of the research hotspots in system engineering at present. It is also the development trend of the design for complex electromechanical system. The unified modeling techniques and tools based on Modelica language provide a satisfactory solution. To meet with the requirements of collaborative modeling, simulation, and parallel computing for complex electromechanical systems based on Modelica, a general web-based modeling and simulation prototype environment, namely, WebMWorks, is designed and implemented. Based on the rich Internet application technologies, an interactive graphic user interface for modeling and post-processing on web browser was implemented; with the collaborative design module, the environment supports top-down, concurrent modeling and team cooperation; additionally, service-oriented architecture–based architecture was applied to supply compiling and solving services which run on cloud-like servers, so the environment can manage and dispatch large-scale simulation tasks in parallel on multiple computing servers simultaneously. An engineering application about pure electric vehicle is tested on WebMWorks. The results of simulation and parametric experiment demonstrate that the tested web-based environment can effectively shorten the design cycle of the complex electromechanical system.

  15. Phase transfer function based method to alleviate image artifacts in wavefront coding imaging system

    Science.gov (United States)

    Mo, Xutao; Wang, Jinjiang

    2013-09-01

    Wavefront coding technique can extend the depth of filed (DOF) of the incoherent imaging system. Several rectangular separable phase masks (such as cubic type, exponential type, logarithmic type, sinusoidal type, rational type, et al) have been proposed and discussed, because they can extend the DOF up to ten times of the DOF of ordinary imaging system. But according to the research on them, researchers have pointed out that the images are damaged by the artifacts, which usually come from the non-linear phase transfer function (PTF) differences between the PTF used in the image restoration filter and the PTF related to real imaging condition. In order to alleviate the image artifacts in imaging systems with wavefront coding, an optimization model based on the PTF was proposed to make the PTF invariance with the defocus. Thereafter, an image restoration filter based on the average PTF in the designed depth of field was introduced along with the PTF-based optimization. The combination of the optimization and the image restoration proposed can alleviate the artifacts, which was confirmed by the imaging simulation of spoke target. The cubic phase mask (CPM) and exponential phase mask (EPM) were discussed as example.

  16. Policy Based Access Control in Dynamic Grid-based Collaborative Environment

    NARCIS (Netherlands)

    Y. Demchenko; L. Gommans; A. Tokmakoff; R. van Buuren

    2006-01-01

    This paper describes the design and development of a flexible, customer-driven, security infrastructure for Gridbased Collaborative Environments. The paper proposes further development of the access control model built around a service or resource provisioning agreement (e.g., an experiment or proje

  17. On the Development and Usability of a Diagram-based Collaborative Brainstorming Component

    NARCIS (Netherlands)

    Azevedo, D.; Fonseca, B.; Paredes, H.; Lukosch, S.G.; Janeiro Lopes Da Silva, J.; Briggs, R.O.

    2013-01-01

    The need for computer-supported collaboration has grown over the last years and made collaboration an important factor within organizations. This trend has resulted in the development of a variety of tools and technologies to support the various forms of collaboration. Many collaborative processes,

  18. On the Development and Usability of a Diagram-based Collaborative Brainstorming Component

    NARCIS (Netherlands)

    Azevedo, D.; Fonseca, B.; Paredes, H.; Lukosch, S.G.; Janeiro Lopes Da Silva, J.; Briggs, R.O.

    2013-01-01

    The need for computer-supported collaboration has grown over the last years and made collaboration an important factor within organizations. This trend has resulted in the development of a variety of tools and technologies to support the various forms of collaboration. Many collaborative processes,

  19. ELECTRONIC COLLABORATION ACROSS CULTURES IN A WEB-BASED PROJECT FOR ENGLISH WRITING INSTRUCTION

    Directory of Open Access Journals (Sweden)

    George C.K. Jor

    2000-01-01

    Full Text Available The paper highlights the importance of experimentation and an innovative approach to English language writing instruction with the help of information communication technology (ICT or IT. First, it describes the local situation of English language teaching at The Chinese University of Hong Kong (CUHK. Then, it summarizes the development of IT proficiency and student-led collaborative learning groups at CUHK. Third, it reports on an international Web-based writing project involving six collaborating schools in different parts of the world including China, the United States, Indonesia, and Hong Kong in the year 1999-2000. In the report, the author-presenter will share with the audience a new ELT course development titled "English Online: Writing on the Web." He will explain the course objectives, the background of participating classes, the Web Course Tools (WebCT, the design of the project, the evaluation of course effectiveness and the outcome of the new curricular initiative. Finally, the paper presents a summary of a practical guide to electronic collaboration and some of the lessons the writer has learnt in five years' experience of participant-observation in English teaching practice using the Web.

  20. Simulation Research on an Electric Vehicle Chassis System Based on a Collaborative Control System

    Directory of Open Access Journals (Sweden)

    Nenglian Feng

    2013-01-01

    Full Text Available This paper presents a collaborative control system for an electric vehicle chassis based on a centralized and hierarchical control architecture. The centralized controller was designed for the suspension and steering system, which is used for improving ride comfort and handling stability; the hierarchical controller was designed for the braking system, which is used for distributing the proportion of hydraulic braking and regenerative braking to improve braking performance. These two sub-controllers function at the same level of the vehicle chassis control system. In order to reduce the potential conflict between the two sub-controllers and realize a coordination optimization of electric vehicle performance, a collaborative controller was built, which serves as the upper controller to carry out an overall coordination analysis according to vehicle signals and revises the decisions of sub-controllers. A simulation experiment was carried out with the MATLAB/Simulink software. The simulation results show that the proposed collaborative control system can achieve an optimized vehicle handling stability and braking safety.

  1. The implementation of problem-based learning in collaborative groups in a chiropractic program in Malaysia

    Directory of Open Access Journals (Sweden)

    Ni Ni Win

    2015-05-01

    Full Text Available Purpose: Problem-based learning (PBL is usually conducted in small-group learning sessions with approximately eight students per facilitator. In this study, we implemented a modified version of PBL involving collaborative groups in an undergraduate chiropractic program and assessed its pedagogical effectiveness. Methods: This study was conducted at the International Medical University, Kuala Lumpur, Malaysia, and involved the 2012 chiropractic student cohort. Six PBL cases were provided to chiropractic students, consisting of three PBL cases for which learning resources were provided and another three PBL cases for which learning resources were not provided. Group discussions were not continuously supervised, since only one facilitator was present. The students’ perceptions of PBL in collaborative groups were assessed with a questionnaire that was divided into three domains: motivation, cognitive skills, and perceived pressure to work. Results: Thirty of the 31 students (97% participated in the study. PBL in collaborative groups was significantly associated with positive responses regarding students’ motivation, cognitive skills, and perceived pressure to work (P<0.05. The students felt that PBL with learning resources increased motivation and cognitive skills (P<0.001. Conclusion: The new PBL implementation described in this study does not require additional instructors or any additional funding. When implemented in a classroom setting, it has pedagogical benefits equivalent to those of small-group sessions. Our findings also suggest that students rely significantly on available learning resources.

  2. Effects of personality traits on collaborative performance in problem-based learning tutorials.

    Science.gov (United States)

    Jang, Hye Won; Park, Seung Won

    2016-12-01

    To examine the relationship between students' collaborative performance in a problem-based learning (PBL) environment and their personality traits. Methods:This retrospective, cross-sectional study was conducted using student data of a PBL program between 2013 and 2014 at Sungkyunkwan University School of Medicine, Seoul, South Korea. Eighty students were included in the study. Student data from the Temperament and Character Inventory were used as a measure of their personality traits. Peer evaluation scores during PBL were used as a measure of students' collaborative performance. Results: Simple regression analyses indicated that participation was negatively related to harm avoidance and positively related to persistence, whereas preparedness for the group work was negatively related to reward dependence. On multiple regression analyses, low reward dependence remained a significant predictor of preparedness. Grade-point average (GPA)  was negatively associated with novelty seeking and cooperativeness and was positively associated with persistence.  Conclusion: Medical students who are less dependent on social reward are more likely to complete assigned independent work to prepare for the PBL tutorials. The findings of this study can help educators better understand and support medical students who are at risk of struggling in collaborative learning environments.

  3. The implementation of problem-based learning in collaborative groups in a chiropractic program in Malaysia.

    Science.gov (United States)

    Win, Ni Ni; Nadarajah, Vishna Devi V; Win, Daw Khin

    2015-01-01

    Problem-based learning (PBL) is usually conducted in small-group learning sessions with approximately eight students per facilitator. In this study, we implemented a modified version of PBL involving collaborative groups in an undergraduate chiropractic program and assessed its pedagogical effectiveness. This study was conducted at the International Medical University, Kuala Lumpur, Malaysia, and involved the 2012 chiropractic student cohort. Six PBL cases were provided to chiropractic students, consisting of three PBL cases for which learning resources were provided and another three PBL cases for which learning resources were not provided. Group discussions were not continuously supervised, since only one facilitator was present. The students' perceptions of PBL in collaborative groups were assessed with a questionnaire that was divided into three domains: motivation, cognitive skills, and perceived pressure to work. Thirty of the 31 students (97%) participated in the study. PBL in collaborative groups was significantly associated with positive responses regarding students' motivation, cognitive skills, and perceived pressure to work (Plearning resources increased motivation and cognitive skills (Plearning resources.

  4. Internet-based distributed collaborative environment for engineering education and design

    Science.gov (United States)

    Sun, Qiuli

    2001-07-01

    This research investigates the use of the Internet for engineering education, design, and analysis through the presentation of a Virtual City environment. The main focus of this research was to provide an infrastructure for engineering education, test the concept of distributed collaborative design and analysis, develop and implement the Virtual City environment, and assess the environment's effectiveness in the real world. A three-tier architecture was adopted in the development of the prototype, which contains an online database server, a Web server as well as multi-user servers, and client browsers. The environment is composed of five components, a 3D virtual world, multiple Internet-based multimedia modules, an online database, a collaborative geometric modeling module, and a collaborative analysis module. The environment was designed using multiple Intenet-based technologies, such as Shockwave, Java, Java 3D, VRML, Perl, ASP, SQL, and a database. These various technologies together formed the basis of the environment and were programmed to communicate smoothly with each other. Three assessments were conducted over a period of three semesters. The Virtual City is open to the public at www.vcity.ou.edu. The online database was designed to manage the changeable data related to the environment. The virtual world was used to implement 3D visualization and tie the multimedia modules together. Students are allowed to build segments of the 3D virtual world upon completion of appropriate undergraduate courses in civil engineering. The end result is a complete virtual world that contains designs from all of their coursework and is viewable on the Internet. The environment is a content-rich educational system, which can be used to teach multiple engineering topics with the help of 3D visualization, animations, and simulations. The concept of collaborative design and analysis using the Internet was investigated and implemented. Geographically dispersed users can build the

  5. Practice Based Versus Telemedicine Based Collaborative Care for Depression in Rural Federally Qualified Health Centers: A Pragmatic Randomized Comparative Effectiveness Trial

    Science.gov (United States)

    Fortney, John C.; Pyne, Jeffrey M.; Mouden, Sip B.; Mittal, Dinesh; Hudson, Teresa J.; Schroeder, Gary W.; Williams, David K.; Bynum, Carol A.; Mattox, Rhonda; Rost, Kathryn M

    2013-01-01

    Objective Practice Based Collaborative Care is a complex evidence-based practice that is difficult to implement in smaller primary care practices lacking on-site mental health staff. Telemedicine Based Collaborative Care virtually co-locates and integrates mental health providers into primary care settings. The objective of this multi-site randomized pragmatic comparative effectiveness trial was to compare the outcomes of patients randomized to Practice Based versus Telemedicine Based Collaborative Care. Method From 2007–2009, patients at Federally Qualified Health Centers serving medically underserved populations were screened for depression, and 364 patients screening positive were enrolled and followed for 18 months. Those randomized to Practice Based Collaborative Care received evidence-based care from an on-site primary care provider and nurse care manager. Those randomized to Telemedicine Based Collaborative Care received evidence-based care from an on-site primary care provider and off-site telephone nurse care manager, telephone pharmacist, tele-psychologist and tele-psychiatrist. The primary clinical outcomes were treatment response, remission and changes in depression severity Results There were significant group main effects for both response (OR=7.74, CI95=3.94–15.20, p<0.0001) and remission (OR=12.69, CI95=4.81–33.46, p<0.0001) and a significant overall group by time interaction effect for Hopkins Symptom Checklist depression severity (χ23=40.51, p<0.0001) with greater reductions in depression severity observed over time for those randomized to Telemedicine Based Collaborative Care. Improvements in outcomes appeared to be attributable to higher fidelity to the collaborative care evidence-base in the Telemedicine Based group. Conclusions Contracting with an off-site Telemedicine Based Collaborative Care team yields better outcomes than implementing Practice Based Collaborative Care with locally available staff. PMID:23429924

  6. An Agent-Based Fuzzy Collaborative Intelligence Approach for Predicting the Price of a Dynamic Random Access Memory (DRAM Product

    Directory of Open Access Journals (Sweden)

    Toly Chen

    2012-05-01

    Full Text Available Predicting the price of a dynamic random access memory (DRAM product is a critical task to the manufacturer. However, it is not easy to contend with the uncertainty of the price. In order to effectively predict the price of a DRAM product, an agent-based fuzzy collaborative intelligence approach is proposed in this study. In the agent-based fuzzy collaborative intelligence approach, each agent uses a fuzzy neural network to predict the DRAM price based on its view. The agent then communicates its view and forecasting results to other agents with the aid of an automatic collaboration mechanism. According to the experimental results, the overall performance was improved through the agents’ collaboration.

  7. A Web-Based Tool for Collaboration and Transdisciplinary Learning Design in Communities of Practice

    DEFF Research Database (Denmark)

    Hansen, Gitte Riis; Vestergård, Erik; Storm*, Helle

    2016-01-01

    idématch is a digital, web-based, and non-commercial platform developed by associate professors from University College Zealand, in cooperation with private enterprises, municipalities, and students. It is designed to bring students, public and private organizations, and citizens together......, transforming ideas into practical solutions, through innovation, using collaborative and transdisciplinary learning designs contributing to new ways of welfare solutions for the Region of Zealand. The key focus is the contribution to innovation in partnership with the work field, students’ learning processes...

  8. Maximum Spanning Tree Model on Personalized Web Based Collaborative Learning in Web 3.0

    OpenAIRE

    Padma, S; Seshasaayee, Ananthi

    2012-01-01

    Web 3.0 is an evolving extension of the current web environme bnt. Information in web 3.0 can be collaborated and communicated when queried. Web 3.0 architecture provides an excellent learning experience to the students. Web 3.0 is 3D, media centric and semantic. Web based learning has been on high in recent days. Web 3.0 has intelligent agents as tutors to collect and disseminate the answers to the queries by the students. Completely Interactive learner's query determine the customization of...

  9. Energy-Based Collaborative Spectrum Sensing for Cognitive UWB Impulse Radio

    Institute of Scientific and Technical Information of China (English)

    Wei-Chiang Wu; Chun-Te Wu

    2015-01-01

    This paper focuses on the issue of collaborative spectrum sensing in cognitive ultra wideband (CUWB) impulse radio. We employ energy-based signal detection method and apply the Neyman-Pearson (NP) decision rule to determine the optimum threshold. Two cooperative spectrum sensing schemes are developed in this paper. The decision fusion scheme is based on hard decision, in which each cooperating cognitive user (CU) sends its own local decision to the fusion center (FC). The FC then makes a final decision according to the majority voting rule. Alternatively, the data fusion scheme is based on soft decision, in which each local CU sends its observed value directly to the FC. The FC combines these values, compares to a threshold and then makes the final decision. The performances of both schemes are studied by using analytical tools and computer simulations. The receiver operating characteristics (ROC), which reveal the probability of detection versus false-alarm curve, are employed to evaluate the system performance under different scenarios.Simulation results demonstrate that the data fusion scheme outperforms the decision fusion scheme and verify that the collaborative spectrum sensing has practical importance in CUWB networks.

  10. Research on conflict resolution of collaborative design with fuzzy case-based reasoning method

    Institute of Scientific and Technical Information of China (English)

    HOU Jun-ming; SU Chong; LIANG Shuang; WANG Wan-shan

    2009-01-01

    Collaborative design is a new style for modern mechanical design to meet the requirement of increasing competition. Designers of different places complete the same work, but the conflict appears in the process of design which may interface the design. Case-based reasoning (CBR) method is applied to the problem of conflict resolution, which is in the artificial intelligence field. However, due to the uncertainties in knowledge representation, attribute description, and similarity measures of CBR, it is very difficult to find the similar cases from case database. A fuzzy CBR method was proposed to solve the problem of conflict resolution in collaborative design. The process of fuzzy CBR was introduced. Based on the feature attributes and their relative weights determined by a fuzzy technique, a fuzzy CBR retrieving mechanism was developed to retrieve conflict resolution cases that tend to enhance the functions of the database. By indexing, calculating the weight and defuzzicating of the cases, the case similarity can be obtained. Then the case consistency was measured to keep the right result. Finally, the fuzzy CBR method for conflict resolution was demonstrated by means of a case study. The prototype system based on web is developed to illustrate the methodology.

  11. Interpreting the strongly lensed supernova iPTF16geu: time delay predictions, microlensing, and lensing rates

    CERN Document Server

    More, Anupreeta; Oguri, Masamune; More, Surhud; Lee, Chien-Hsiu

    2016-01-01

    We present predictions for time delays between multiple images of the gravitationally lensed supernova, iPTF16geu, which was recently discovered from the intermediate Palomar Transient Factory (iPTF). As the supernova is of Type Ia where the intrinsic luminosity is usually well-known, accurately measured time delays of the multiple images could provide tight constraints on the Hubble constant. According to our lens mass models constrained by the {\\it Hubble Space Telescope} F814W image, we expect the maximum relative time delay to be less than a day, which is consistent with the maximum of 100 hours reported by Goobar et al. but places a stringent upper limit. Furthermore, the fluxes of most of the supernova images depart from expected values suggesting that they are affected by microlensing. The microlensing timescales are small enough that they may pose significant problems to measure the time delays reliably. Our lensing rate calculation indicates that the occurrence of a lensed SN in iPTF is likely. Howev...

  12. Early Radio and X-Ray Observations of the Youngest Nearby Type Ia Supernova PTF 11kly (SN 2011fe)

    Science.gov (United States)

    Horesh, Assaf; Kulkarni, S. R.; Fox, Derek B.; Carpenter, John; Kasliwal, Mansi M.; Ofek, Eran O.; Quimby, Robert; Gal-Yam, Avishay; Cenko, S. Bradley; deBruyn, A. G.; Kamble, Atish; Wijers, Ralph A. M. J.; vanderHorst, Alexander J.; Kouveliotou, Chryssa; Podsiadlowski, Philipp; Sullivan, Mark; Maguire, Kate; Howell, D. Andrew; Nugent, Peter E.; Gehrels, Neil; Law, Nicolas M.; Poznanski, Dovi; Shara, Michael

    2012-01-01

    On August 24 (UT) the Palomar Transient Factory (PTF) discovered PTF11kly (SN 2011fe), the youngest and most nearby type Ia supernova (SN Ia) in decades. We followed this event up in the radio (centimeter and millimeter bands) and X-ray bands, starting about a day after the estimated explosion time. We present our analysis of the radio and X-ray observations, yielding the tightest constraints yet placed on the pre-explosion mass-loss rate from the progenitor system of this supernova. We find a robust limit of M(raised dot) less than or equal to 10(exp -8) (w /100 kilometers per second ) solar mass yr(exp -1) from sensitive X-ray non-detections, as well as a similar limit from radio data, which depends, however, on assumptions about microphysical parameters. We discuss our results in the context of single-degenerate models for SNe Ia and find that our observations modestly disfavor symbiotic progenitor models involving a red giant donor, but cannot constrain systems accreting from main sequence or sub-giant stars, including the popular supersoft channel. In view of the proximity of PTF11kly and the sensitivity of our prompt observations we would have to wait for a long time (decade or longer) in order to more meaningfully probe the circumstellar matter of Ia supernovae.

  13. The hydrogen-poor superluminous supernova iPTF13ajg and its host galaxy in absorption and emission

    CERN Document Server

    Vreeswijk, Paul M; Gal-Yam, Avishay; De Cia, Annalisa; Quimby, Robert M; Sullivan, Mark; Cenko, S Bradley; Perley, Daniel A; Filippenko, Alexei V; Clubb, Kelsey I; Taddia, Francesco; Sollerman, Jesper; Leloudas, Giorgos; Arcavi, Iair; Rubin, Adam; Kasliwal, Mansi M; Cao, Yi; Yaron, Ofer; Tal, David; Ofek, Eran O; Capone, John; Kutyrev, Alexander S; Toy, Vicki; Nugent, Peter E; Laher, Russ; Surace, Jason; Kulkarni, Shrinivas R

    2014-01-01

    We present imaging and spectroscopy of a hydrogen-poor superluminous supernova (SLSN) discovered by the intermediate Palomar Transient Factory: iPTF13ajg. At a redshift of z=0.7403, derived from narrow absorption lines, iPTF13ajg peaked at an absolute magnitude M(u,AB)=-22.5, one of the most luminous supernovae to date. The uBgRiz light curves, obtained with the P48, P60, NOT, DCT, and Keck telescopes, and the nine-epoch spectral sequence secured with the Keck and the VLT (covering 3 rest-frame months), are tied together photometrically to provide an estimate of the flux evolution as a function of time and wavelength. The observed bolometric peak luminosity of iPTF13ajg is 3.2x10^44 erg/s, while the estimated total radiated energy is 1.3x10^51 erg. We detect narrow absorption lines of Mg I, Mg II, and Fe II, associated with the cold interstellar medium in the host galaxy, at two different epochs with X-shooter at the VLT. From Voigt-profile fitting, we derive the column densities log N(Mg I)=11.94+-0.06, log ...

  14. PTF1 J071912.13+485834.0: An outbursting AM CVn system discovered by a synoptic survey

    CERN Document Server

    Levitan, David; Groot, Paul J; Kulkarni, Shrinivas R; Ofek, Eran O; Prince, Thomas A; Shporer, Avi; Bloom, Joshua S; Cenko, S Bradley; Kasliwal, Mansi M; Law, Nicholas M; Nugent, Peter E; Poznanski, Dovi; Quimby, Robert M; Horesh, Assaf; Sesar, Branimir; Sternberg, Assaf

    2011-01-01

    We present extensive photometric and spectroscopic observations of PTF1 J071912.13+485834.0, an outbursting AM CVn system discovered by the Palomar Transient Factory (PTF). AM CVn systems are stellar binaries with some of the smallest separations known and orbital periods ranging from 5 to 65 minutes. They are believed to be composed of a white dwarf accretor and a (semi)-degenerate He-rich donor and are considered to be the helium equivalents of Cataclysmic Variables. We have spectroscopically and photometrically identified an orbital period of 26.77 \\pm 0.02 minutes for PTF1 J071912.13+485834.0 and found a super-outburst recurrence time of greater than 65 days along with the presence of "normal" outbursts - rarely seen in AM CVn systems but well known in super-outbursting Cataclysmic Variables. We present a long-term light curve over two super-cycles as well as high cadence photometry of both outburst and quiescent stages, both of which show clear variability. We also compare both the outburst and quiescent...

  15. PTF 13efv - An outburst 500 days prior to the SNHunt 275 explosion and its radiative efficiency

    CERN Document Server

    Ofek, E O; Shaviv, N J; Duggan, G; Strotjohann, N -L; Rubin, A; Kulkarni, S R; Gal-Yam, A; Sullivan, M; Cao, Y; Nugent, P E; Kasliwal, M M; Sollerman, J; Fransson, C; Filippenko, A V; Perley, D A; Yaron, O; Laher, R

    2016-01-01

    The progenitors of some supernovae (SNe) exhibit outbursts with super-Eddington luminosities prior to their final explosions. This behavior is common among Type IIn SNe, but the driving mechanisms of these precursors are not yet well understood. SNHunt 275 was announced as a possible new SN during May 2015. Here we report on pre-explosion observations of the location of this event by the Palomar Transient Factory (PTF) and report the detection of a precursor about 500 days prior to the 2015 May activity (PTF 13efv). The observed velocities in the 2015 transient and its 2013 precursor absorption spectra are low (1000-2000 km/s), so it is not clear yet if the recent activity indeed marks the final disruption of the progenitor. Regardless of the nature of this event, we use the PTF photometric and spectral observations, as well as Swift-UVOT observations, to constrain the efficiency of the radiated energy relative to the total kinetic energy of the precursor. We find that, using an order-of-magnitude estimate an...

  16. PipeCF:a DHT-based Collaborative Filtering recommendation system

    Institute of Scientific and Technical Information of China (English)

    SHEN Rui-min; YANG Fan; HAN Peng; XIE Bo

    2005-01-01

    Collaborative Filtering (CF) technique has proved to be one of the most successful techniques in recommendation systems in recent years. However, traditional centralized CF system has suffered from its limited scalability as calculation complexity increases rapidly both in time and space when the record in the user database increases. Peer-to-peer (P2P) network has attracted much attention because of its advantage of scalability as an alternative architecture for CF systems. In this paper, authors propose a decentralized CF algorithm, called PipeCF, based on distributed hash table (DHT) method which is the most popular P2P routing algorithm because of its efficiency, scalability, and robustness. Authors also propose two novel approaches: significance refinement (SR) and unanimous amplification (UA), to improve the scalability and prediction accuracy of DHT-based CF algorithm. The experimental data show that our DHT-based CF system has better prediction accuracy, efficiency and scalability than traditional CF systems.

  17. Market-based collaborative control of distributed multiple product development projects

    Science.gov (United States)

    Lee, Yonghan; Kumara, Soundar R. T.

    2000-12-01

    Due to the widespread availability of the Internet large scale distributed projects in manufacturing are becoming popular. We present a distributed, collaborative, and adaptive control approach for distributed multiple product development projects (DMPDP), which is a representative project environment in modern e-enterprises. In DMPDP environment, multiple project groups share and compete for limited resources to achieve their own goals. On the other hand, the shared resource divisions try to utilize their resources efficiently. We suggest that this kind of situation can be well modeled and efficiently solved by using two novel approaches: multiagent based information infrastructure and market-based control mechanism. In this paper, we formalize the DMPDP control problem, and propose a market-based negotiation mechanism called sequential market clearing (SMC) protocol. For clear presentation, some of information system design and implementation issues are also presented.

  18. Facile Routes to NiF(6)(2)(-), AgF(4)(-), AuF(6)(-), and PtF(6)(-) Salts Using O(2)(+) as a Source of O(2)F in Anhydrous HF.

    Science.gov (United States)

    Lucier, G. M.; Shen, C.; Elder, S. H.; Bartlett, N.

    1998-07-27

    O(2)(+) salts dissolved in liquid anhydrous hydrogen fluoride (aHF) at 20 degrees C or below oxidize aHF solutions of PtF(6)(2)(-) to PtF(6)(-). The parent base of O(2)(+) salts in aHF (O(2)F((solv))) generated with alkali fluoride is long-lived below -50 degrees C. An aHF solution of O(2)F((solv)) oxidizes Au(III) to Au(V) below -50 degrees C (2O(2)F((solv)) + AuF(4)(-)((solv)) --> AuF(6)(-)((solv)) +2O(2(g))). In situ generation of O(2)F((solv)) (O(2)(+)((solv)) + F(-)((solv)) --> O(2)F((solv))) with AgF(2) or NiF(2) in suspension in the aHF made basic with alkali fluoride gives AgF(4)(-) and NiF(6)(2)(-)salts. Low solubility of AAsF(6)(A = Cs, K) in aHF provides for the metathetical preparation of (O(2))(2)PdF(6) solutions in aHF. Removal of aHF, even at -60 degrees C, results in some O(2) and F(2) loss, to a composition approaching (O(2))PdF(5).

  19. A Web-Based Collaborative System for Remote Monitoring and Analysis of Livestock Farm Odours

    NARCIS (Netherlands)

    Liu, R.; Pan, L. L.; Yang, S. X.

    Monitoring and analysis of livestock farm environments require collection and management of large amount of data from distributed farms. There is an increasing demand for collaboration among livestock producers, environment agencies and governments. This paper presents a collaborative system for

  20. Community-based senior health promotion program using a collaborative practice model: the Escalante Health Partnerships.

    Science.gov (United States)

    Nuñez, Diane E; Armbruster, Charlotte; Phillips, Wayne T; Gale, Betty J

    2003-01-01

    Recent research demonstrates that, although the risk of disease and disability clearly increases with age, poor health need not be an inevitable consequence of aging. A healthy lifestyle is more influential than genetic factors in assisting older adults avoid the decline and deterioration traditionally associated with aging. Many effective strategies for reducing disease and disability are widely underused. The Escalante Health Partnerships is a community-based, nurse-managed health promotion and chronic disease care management program for community-residing older adults. The program base supports a multidisciplinary, collaborative practice model, which has responded to the health needs of members of a community at high risk of having or developing chronic conditions. Preliminary comparisons of the health status of program participants with national norms demonstrate that these seniors report better general health, performance of roles, and social functioning, with the strongest correlations occurring between general health and vitality and between general health and role-physical. In addition, these participants have 4.2 doctor visits per year, in comparison with 7.1 office visits for a national comparison group and 1.6 hospital days per year, in comparison with 2.1 hospital days in the same referenced population. This collaborative partnership is a model that can be replicated cost-effectively in other communities.

  1. Essential features influencing collaboration in team-based non-specific back pain rehabilitation: Findings from a mixed methods study

    OpenAIRE

    Hellman, Therese; Jensen, Irene; Bergström, Gunnar; Brämberg, Elisabeth Björk

    2016-01-01

    ABSTRACT The aim of the study presented in this article was to explore how professionals, without guidelines for implementing interprofessional teamwork, experience the collaboration within team-based rehabilitation for people with back pain and how this collaboration influences their clinical practice. This study employed a mixed methods design. A questionnaire was answered by 383 participants and 17 participants were interviewed. The interviews were analysed using content analysis. The quan...

  2. Digging into data using new collaborative infrastructures supporting humanities-based computer science research

    OpenAIRE

    2011-01-01

    This paper explores infrastructure supporting humanities–computer science research in large–scale image data by asking: Why is collaboration a requirement for work within digital humanities projects? What is required for fruitful interdisciplinary collaboration? What are the technical and intellectual approaches to constructing such an infrastructure? What are the challenges associated with digital humanities collaborative work? We reveal that digital humanities collaboration requ...

  3. An evaluation of workspace awareness in collaborative, gesture-based diagramming tools

    DEFF Research Database (Denmark)

    Hansen, Klaus Marius; Damm, Carsten

    2004-01-01

    Designing usable real-time, distributed collaboration tools is a complex but important task. Workspace awareness can potentially help in making realtime, distributed collaboration tools more usable through a communication of who is in the shared workspace and what they are doing. We present...... qualitative evaluations of the workspace awareness features of a gesturebased diagramming tool, Distributed Knight, that supports real-time, distributed collaboration. These studies suggest that using simple, nonintrusive awareness means results in fewer breakdowns, more symmetric collaboration patterns...

  4. Knowledge translation and interprofessional collaboration: Where the rubber of evidence-based care hits the road of teamwork.

    Science.gov (United States)

    Zwarenstein, Merrick; Reeves, Scott

    2006-01-01

    Knowledge-translation interventions and interprofessional education and collaboration interventions all aim at improving health care processes and outcomes. Knowledge-translation interventions attempt to increase evidence-based practice by a single professional group and thus may fail to take into account barriers from difficulties in interprofessional relations. Interprofessional education and collaboration interventions aim to improve interprofessional relations, which may in turn facilitate the work of knowledge translation and thus evidence-based practice. We summarize systematic review work on the effects of interventions for interprofessional education and collaboration. The current evidence base contains mainly descriptive studies of these interventions. Knowledge is limited regarding the impact on care and outcomes and the extent to which the interventions increase the practice of evidence-based care. Rigorous multimethod research studies are needed to develop and strengthen the current evidence base in this field. We describe a Health Canada-funded randomized trial in which quantitative and qualitative data will be gathered in 20 general internal medicine units located at 5 Toronto, Ontario, teaching hospitals. The project examines the impact of interprofessional education and collaboration interventions on interprofessional relationships, health care processes (including evidence-based practice), and patient outcomes. Routes are suggested by which interprofessional education and collaboration interventions might affect knowledge translation and evidence-based practice.

  5. Collaboration 'Engineerability'

    NARCIS (Netherlands)

    Kolfschoten, Gwendolyn L.; de Vreede, Gert-Jan; Briggs, Robert O.; Sol, Henk G.

    2010-01-01

    Collaboration Engineering is an approach to create sustained collaboration support by designing collaborative work practices for high-value recurring tasks, and transferring those designs to practitioners to execute for themselves without ongoing support from collaboration professionals. A key assum

  6. Combining collaboration and competition with prevocational game-based math education

    NARCIS (Netherlands)

    ter Vrugte, Judith; de Jong, Anthonius J.M.; Van der Cruysse, S.; Wouters, P.; van Oostendorp, H.; Elen, J.

    2015-01-01

    The present study addressed the effectiveness of an educational math game for improving proportional reasoning in prevocational education, and examined the added value of face-to-face collaboration and competition. The study compared four conditions: the game with collaboration, with collaboration

  7. Facilitating Collaboration in e-Supply Chain Systems: An Action Learning-Based Approach

    NARCIS (Netherlands)

    McNichols, Timothy; Brennan, Louis; Middel, Rick

    2006-01-01

    constructing long-term collaborative partnerships. Often firms introduce e-enabled systems to integrate strategic suppliers into collaborative networks. But in reality, many of these collaborative supply chain systems have underperformed or been terminated. Often these inter-organisational systems a

  8. Modeling a Collaborative Answer Negotiation Activity Using IMS-Based Learning Design

    Science.gov (United States)

    Valdivia, R.; Nussbaum, M.; Ochoa, S. F.

    2009-01-01

    This paper describes the design and impact of a face-to-face Computer Supported Collaborative Learning activity named Collaborative Answer Negotiation Activity (CANA). CANA primarily involves face-to-face interactions among students supported by wirelessly interconnected mobile devices to solve collaboratively a set of multiple-choice questions.…

  9. Fostering interactivity through peer assessment in web-based collaborative learning environments

    NARCIS (Netherlands)

    H. H. Tillema,; J. W. Strijbos; M. S. R. Segers; Dominique Sluijsmans; T. A. Ochoa

    2009-01-01

    Extant literature on collaborative learning shows that this instructional approach is widely used. In this chapter, the authors discuss the lack of alignment between collaborative learning and assessment practices. They will argue that peer assessment is a form of collaborative learning and a mode

  10. Fostering interactivity through peer assessment in web-based collaborative learning environments

    NARCIS (Netherlands)

    Sluijsmans, Dominique; Tillema, H. H.; Segers, M. S. R.; Ochoa, T. A.; Strijbos, J. W.

    2009-01-01

    Extant literature on collaborative learning shows that this instructional approach is widely used. In this chapter, the authors discuss the lack of alignment between collaborative learning and assessment practices. They will argue that peer assessment is a form of collaborative learning and a mode o

  11. Combining collaboration and competition with prevocational game-based math education

    NARCIS (Netherlands)

    Vrugte, ter J.; Jong, de T.; Vandercruysse, S.; Wouters, P.; Oostendorp, van H.; Elen, J.

    2015-01-01

    The present study addressed the effectiveness of an educational math game for improving proportional reasoning in prevocational education, and examined the added value of face-to-face collaboration and competition. The study compared four conditions: the game with collaboration, with collaboration a

  12. A physician team's experiences in community-based participatory research: insights into effective group collaborations.

    Science.gov (United States)

    Dalal, Mehul; Skeete, Rachel; Yeo, Heather L; Lucas, Georgina I; Rosenthal, Marjorie S

    2009-12-01

    Postdoctoral fellows from the Robert Wood Johnson Clinical Scholars Program are among a growing number of physician-researchers training in community-based participatory research (CBPR). These fellows are uniquely positioned to observe and evaluate CBPR training needs and the experience of collaboratively conducting a CBPR project. To describe, from the perspective of physician-researchers, experiences in intragroup and intergroup collaborations while conducting CBPR. During a 2-year fellowship, a group of seven fellows received 6 months of didactic training and then spent 18 months conducting a mentored CBPR project. The CBPR project was complemented by a 2-year facilitated leadership seminar, which allowed for reflection on intragroup (among fellows) and intergroup (fellows/community members) relationships throughout the CBPR process. Seven core principles of CBPR were found to apply to not only intergroup but also intragroup relationships: (1) building trust, (2) finding a shared interest, (3) power-sharing, (4) fostering co-learning and capacity building among partners, (5) building on existing strengths, (6) employing an iterative process, and (7) finding a balance between research and action for the mutual benefit of all partners. Establishing and maintaining relationships is at the core of CBPR. The development of intragroup relationships paralleled the development of intergroup relationships with community members. Applying the core principles of CBPR to the development of intragroup relationships provided experience that may have enhanced relationships with community partners. An a priori acknowledgement of the importance of relationships and the time needed to develop and manage those relationships may add to the CBPR training experience and assist in successfully executing collaborative projects.

  13. Collaborative Improvement

    DEFF Research Database (Denmark)

    Kaltoft, Rasmus

    The thesis data have been collected in the EU-sponsored project: Collaborative Improvement Tool for the Extended Manufacturing Enterprise, CO-IMPROVE. In this project four universities (Denmark, Ireland, Italy, and The Netherlands), two software vendors (Greece and Sweden) and three companies (De...... learn how to improve operations in (hopefully) a win-win like manner through collaboration.......The thesis data have been collected in the EU-sponsored project: Collaborative Improvement Tool for the Extended Manufacturing Enterprise, CO-IMPROVE. In this project four universities (Denmark, Ireland, Italy, and The Netherlands), two software vendors (Greece and Sweden) and three companies...... (Denmark, Italy and The Netherlands) each with three to five suppliers were involved. The CO-IMPROVE project and the thesis is based on “action research” and “action learning”. The main aim of the whole project is through actual involvement and actions make the researchers, companies and selected suppliers...

  14. Attitudes of nurses and physicians towards nurse-physician collaboration in northwest Ethiopia: a hospital based cross-sectional study.

    Science.gov (United States)

    Amsalu, Eden; Boru, Brihanu; Getahun, Firehiwot; Tulu, Begna

    2014-01-01

    Collaboration between professionals is important in health institutions where most activities are team-performed. Ineffective nurse-physician collaboration affects patient outcome, nurses' job satisfaction and organizational cost and is challenged by personal, interpersonal and organizational factors. The main objective of this study was to assess attitudes of nurses and physicians towards nurse-physician collaboration and the level of satisfaction with regard to quality of collaboration between them at Referral Hospitals of Northwest Ethiopia, from February 1st to April 30, 2013. An institution based cross-sectional study was conducted among 176 nurses and 53 physicians working in Felegehiwot and Gondar University Referral Hospitals. Data were collected using self-administered questionnaires. Attitudes of nurses and physicians were measured using Jefferson scale of attitudes towards nurse-physician Collaboration. Results were summarized using descriptive statistics and difference of means and proportions were evaluated using student t test p Collaboration includes four subscales, which are: 1) shared education and teamwork, 2) Caring vs curing, 3) nurses autonomy and 4) physician dominance. Nurses scored higher on three subscales (1, 2 and 4). However, statistically significant differences were noted with regard to subscales 2 and 4 (p = 0.01, p = 0.004, respectively). This study identified that neither nurses nor physicians were satisfied with their current collaboration and nurses demonstrated less satisfaction with the current nurse physician collaboration. As compared with physicians nurses had more favorable attitudes towards collaboration specifically toward nurses' contributions to the psychosocial and educational aspects of patient care, and stronger rejection of a totally dominant physician role.

  15. Collaboration between physicians and a hospital-based palliative care team in a general acute-care hospital in Japan

    Directory of Open Access Journals (Sweden)

    Nishikitani Mariko

    2010-06-01

    Full Text Available Abstract Background Continual collaboration between physicians and hospital-based palliative care teams represents a very important contributor to focusing on patients' symptoms and maintaining their quality of life during all stages of their illness. However, the traditionally late introduction of palliative care has caused misconceptions about hospital-based palliative care teams (PCTs among patients and general physicians in Japan. The objective of this study is to identify the factors related to physicians' attitudes toward continual collaboration with hospital-based PCTs. Methods This cross-sectional anonymous questionnaire-based survey was conducted to clarify physicians' attitudes toward continual collaboration with PCTs and to describe the factors that contribute to such attitudes. We surveyed 339 full-time physicians, including interns, employed in a general acute-care hospital in an urban area in Japan; the response rate was 53% (N = 155. We assessed the basic characteristics, experience, knowledge, and education of respondents. Multiple logistic regression analysis was used to determine the main factors affecting the physicians' attitudes toward PCTs. Results We found that the physicians who were aware of the World Health Organization (WHO analgesic ladder were 6.7 times (OR = 6.7, 95% CI = 1.98-25.79 more likely to want to treat and care for their patients in collaboration with the hospital-based PCTs than were those physicians without such awareness. Conclusion Basic knowledge of palliative care is important in promoting physicians' positive attitudes toward collaboration with hospital-based PCTs.

  16. Collaborative case-based reasoning for knowledge discovery of elders health assessment system.

    Science.gov (United States)

    Hu, Ping; Gu, Dong-Xiao; Zhu, Yu

    2014-01-01

    The existing Elders Health Assessment (EHA) system based on single-case-library reasoning has low intelligence level, poor coordination, and limited capabilities of assessment decision support. To effectively support knowledge reuse of EHA system, this paper proposes collaborative case reasoning and applies it to the whole knowledge reuse process of EHA system. It proposes a multi-case library reasoning application framework of EHA knowledge reuse system, and studies key techniques such as case representation, case retrieval algorithm, case optimization and correction, and reuse etc.. In the aspect of case representation, XML-based multi-case representation for case organization and storage is applied to facilitate case retrieval and management. In the aspect of retrieval method, Knowledge-Guided Approach with Nearest-Neighbor is proposed. Given the complexity of EHA, Gray Relational Analysis with weighted Euclidean Distance is used to measure the similarity so as to improve case retrieval accuracy.

  17. E-LEARNING PERSONALIZATION BASED ON COLLABORATIVE FILTERING AND LEARNER’S PREFERENCE

    Directory of Open Access Journals (Sweden)

    OUTMANE BOURKOUKOU

    2016-11-01

    Full Text Available Personalized e-learning based on recommender system is recognized as one of the most interesting research field in the education and teaching in this last decade, since, the learning style is specific for each student. In fact from the knowledge of his or her learning style; it is easier to recommend a teaching strategy builds around a collection of the most adequate learning objects to give a better return on the educational level. This work focuses on the design of a personalized e-learning environment based on collaborative filtering and learning styles. Using the learner profile, the device proposed a personalized teaching strategy by selecting and sequencing learning objects fitting with the learners’ learning styles. Moreover, an experiment was conducted to evaluate the performance of our approach. The result reveals the system effectiveness for which it appears that the proposed approach may be promising.

  18. CulturalWiki: A Semantic Map-Based Wiki for Interdisciplinary Collaboration

    Directory of Open Access Journals (Sweden)

    Stefano Valtolina

    2013-11-01

    Full Text Available The use of digital maps capitalizes on the long tradition of using paper maps as mean of communication and learning among people. More than ever, maps are becoming one of the most used metaphors to present concepts and knowledge. This paper presents a wiki infrastructure for map-based information systems’ design that, through an ontology, defines a semantic model able to minimize the problems in communication across interdisciplinary communities by putting together cultural information from different data sources. Using map-oriented solution, the wiki is aimed at enabling intercultural collaboration and learning among all the stakeholders involved in cultural heritage projects. A living lab based on the use of the CulturalWiki framework is described and the results of evaluations are presented.

  19. A Collaborative Secure Localization Algorithm Based on Trust Model in Underwater Wireless Sensor Networks.

    Science.gov (United States)

    Han, Guangjie; Liu, Li; Jiang, Jinfang; Shu, Lei; Rodrigues, Joel J P C

    2016-02-16

    Localization is one of the hottest research topics in Underwater Wireless Sensor Networks (UWSNs), since many important applications of UWSNs, e.g., event sensing, target tracking and monitoring, require location information of sensor nodes. Nowadays, a large number of localization algorithms have been proposed for UWSNs. How to improve location accuracy are well studied. However, few of them take location reliability or security into consideration. In this paper, we propose a Collaborative Secure Localization algorithm based on Trust model (CSLT) for UWSNs to ensure location security. Based on the trust model, the secure localization process can be divided into the following five sub-processes: trust evaluation of anchor nodes, initial localization of unknown nodes, trust evaluation of reference nodes, selection of reference node, and secondary localization of unknown node. Simulation results demonstrate that the proposed CSLT algorithm performs better than the compared related works in terms of location security, average localization accuracy and localization ratio.

  20. The hydrogen-poor superluminous supernova iPTF 13ajg and its host galaxy in absorption and emission

    Energy Technology Data Exchange (ETDEWEB)

    Vreeswijk, Paul M.; Gal-Yam, Avishay; De Cia, Annalisa; Rubin, Adam; Yaron, Ofer; Tal, David; Ofek, Eran O. [Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 7610001 (Israel); Savaglio, Sandra [Max Planck Institute for Extraterrestrial Physics, D-85748 Garching bei München (Germany); Quimby, Robert M. [Kavli Institute for the Physics and Mathematics of the Universe (WPI), Todai Institutes for Advanced Study, The University of Tokyo 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba 277-8583 (Japan); Sullivan, Mark [School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ (United Kingdom); Cenko, S. Bradley; Filippenko, Alexei V.; Clubb, Kelsey I. [Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States); Perley, Daniel A.; Cao, Yi [Astronomy Department, California Institute of Technology, MC 249-17, 1200 East California Boulevard, Pasadena, CA 91125 (United States); Taddia, Francesco; Sollerman, Jesper; Leloudas, Giorgos [Department of Astronomy, The Oskar Klein Center, Stockholm University, AlbaNova 10691 Stockholm (Sweden); Arcavi, Iair [Las Cumbres Observatory Global Telescope Network, 6740 Cortona Drive, Suite 102, Goleta, CA 93117 (United States); Kasliwal, Mansi M., E-mail: paul.vreeswijk@weizmann.ac.il [The Observatories, Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101 (United States); and others

    2014-12-10

    We present imaging and spectroscopy of a hydrogen-poor superluminous supernova (SLSN) discovered by the intermediate Palomar Transient Factory, iPTF 13ajg. At a redshift of z = 0.7403, derived from narrow absorption lines, iPTF 13ajg peaked at an absolute magnitude of M {sub u,} {sub AB} = –22.5, one of the most luminous supernovae to date. The observed bolometric peak luminosity of iPTF 13ajg is 3.2 × 10{sup 44} erg s{sup –1}, while the estimated total radiated energy is 1.3 × 10{sup 51} erg. We detect narrow absorption lines of Mg I, Mg II, and Fe II, associated with the cold interstellar medium in the host galaxy, at two different epochs with X-shooter at the Very Large Telescope. From Voigt profile fitting, we derive the column densities log N(Mg I) =11.94 ± 0.06, log N(Mg II) =14.7 ± 0.3, and log N(Fe II) =14.25 ± 0.10. These column densities, as well as the Mg I and Mg II equivalent widths of a sample of hydrogen-poor SLSNe taken from the literature, are at the low end of those derived for gamma-ray bursts (GRBs) whose progenitors are also thought to be massive stars. This suggests that the environments of hydrogen-poor SLSNe and GRBs are different. From the nondetection of Fe II fine-structure absorption lines, we derive a lower limit on the distance between the supernova and the narrow-line absorbing gas of 50 pc. The neutral gas responsible for the absorption in iPTF 13ajg exhibits a single narrow component with a low velocity width, ΔV = 76 km s{sup –1}, indicating a low-mass host galaxy. No host galaxy emission lines are detected, leading to an upper limit on the unobscured star formation rate (SFR) of SFR{sub [O} {sub II]}<0.07M{sub ⊙}yr{sup −1}. Late-time imaging shows the iPTF 13ajg host galaxy to be faint, with g {sub AB} ≈ 27.0 and R {sub AB} ≥ 26.0 mag, corresponding to M {sub B,} {sub Vega} ≳ –17.7 mag.

  1. User requirements for geo-collaborative work with spatio-temporal data in a web-based virtual globe environment.

    Science.gov (United States)

    Yovcheva, Zornitza; van Elzakker, Corné P J M; Köbben, Barend

    2013-11-01

    Web-based tools developed in the last couple of years offer unique opportunities to effectively support scientists in their effort to collaborate. Communication among environmental researchers often involves not only work with geographical (spatial), but also with temporal data and information. Literature still provides limited documentation when it comes to user requirements for effective geo-collaborative work with spatio-temporal data. To start filling this gap, our study adopted a User-Centered Design approach and first explored the user requirements of environmental researchers working on distributed research projects for collaborative dissemination, exchange and work with spatio-temporal data. Our results show that system design will be mainly influenced by the nature and type of data users work with. From the end-users' perspective, optimal conversion of huge files of spatio-temporal data for further dissemination, accuracy of conversion, organization of content and security have a key role for effective geo-collaboration.

  2. Analyzing discourse and text complexity for learning and collaborating a cognitive approach based on natural language processing

    CERN Document Server

    Dascălu, Mihai

    2014-01-01

    With the advent and increasing popularity of Computer Supported Collaborative Learning (CSCL) and e-learning technologies, the need of automatic assessment and of teacher/tutor support for the two tightly intertwined activities of comprehension of reading materials and of collaboration among peers has grown significantly. In this context, a polyphonic model of discourse derived from Bakhtin’s work as a paradigm is used for analyzing both general texts and CSCL conversations in a unique framework focused on different facets of textual cohesion. As specificity of our analysis, the individual learning perspective is focused on the identification of reading strategies and on providing a multi-dimensional textual complexity model, whereas the collaborative learning dimension is centered on the evaluation of participants’ involvement, as well as on collaboration assessment. Our approach based on advanced Natural Language Processing techniques provides a qualitative estimation of the learning process and enhance...

  3. Evaluation and selection of the ship collaborative design resources based on AHP and genetic and simulated annealing algorithm

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    The characteristics of the design resources in the ship collaborative design is described and the hierarchical model for the evaluation of the design resources is established. The comprehensive evaluation of the co-designers for the collaborative design resources has been done from different aspects using Analytic Hierarchy Process (AHP),and according to the evaluation results,the candidates are determined. Meanwhile,based on the principle of minimum cost,and starting from the relations between the design tasks and the corresponding co-designers,the optimizing selection model of the collaborators is established and one novel genetic combined with simulated annealing algorithm is proposed to realize the optimization. It overcomes the defects of the genetic algorithm which may lead to the premature convergence and local optimization if used individually. Through the application of this method in the ship collaborative design system,it proves the feasibility and provides a quantitative method for the optimizing selection of the design resources.

  4. Simulation of collaborative studies for real-time PCR-based quantitation methods for genetically modified crops.

    Science.gov (United States)

    Watanabe, Satoshi; Sawada, Hiroshi; Naito, Shigehiro; Akiyama, Hiroshi; Teshima, Reiko; Furui, Satoshi; Kitta, Kazumi; Hino, Akihiro

    2013-01-01

    To study impacts of various random effects and parameters of collaborative studies on the precision of quantitation methods of genetically modified (GM) crops, we developed a set of random effects models for cycle time values of a standard curve-based relative real-time PCR that makes use of an endogenous gene sequence as the internal standard. The models and data from a published collaborative study for six GM lines at four concentration levels were used to simulate collaborative studies under various conditions. Results suggested that by reducing the numbers of well replications from three to two, and standard levels of endogenous sequence from five to three, the number of unknown samples analyzable on a 96-well PCR plate in routine analyses could be almost doubled, and still the acceptable repeatability RSD (RSDr crops by real-time PCR and their collaborative studies.

  5. Collaborative Aviation Weather Statement - An Impact-based Decision Support Tool

    Science.gov (United States)

    Blondin, Debra

    2016-04-01

    Historically, convection causes the highest number of air traffic constraints on the United States National Air Space (NAS). Increased NAS predictability allows traffic flow managers to more effectively initiate, amend or terminate planned or active traffic management initiatives, resulting in more efficient use of available airspace. A Collaborative Aviation Weather Statement (CAWS) is an impact-based decision support tool used for the timely delivery of high-confidence, high-relevance aviation convective weather forecasts to air traffic managers. The CAWS is a graphical and textual forecast produced by a collaborative team of meteorologists from the Aviation Weather Center (AWC), Center Weather Service Units, and airlines to bring attention to high impact areas of thunderstorms. The CAWS addresses thunderstorm initiation or movement into the airports having the highest volume of traffic or into traffic sensitive jet routes. These statements are assessed by planners at the Federal Aviation Administration's (FAA) Air Route Traffic Control Centers and are used for planning traffic management initiatives to balance air traffic flow across the United States. The FAA and the airline industry use the CAWS to plan, manage, and execute operations in the NAS, thereby improving the system efficiency and safety and also saving dollars for industry and the traveling public.

  6. Effect of Collaborative Studies on Prospective Teachers’ Creative Thinking Skills while Designing Computer Based Material

    Directory of Open Access Journals (Sweden)

    Salih BİRİŞÇİ

    2011-06-01

    Full Text Available The purpose of this study to examine effect of collaborative studies on prospective teachers‟ creative thinking skills while designing computer based materials. One group pre-test and post-test design of the pre-experimental model was used to achieve the objectives of the study. This experimental study have been applied to 34 prospective teachers who studied at Artvin Coruh University Facult of Education Primary Education Department in 2009-2010 spring term within the context of “Computer-II” course. “Creative Thinking Skill Scale” was applied at two different stages as pre-test and post-test and opinions of students were gathered about the method in research via interview forms. As a result, it was found that there was a significant difference between the prospective teachers‟ creative thinking skills and scores taken from scale were increased in favor of post-test. Collaborative group works have a great importance in occurrence of this increase was revealed from student views.

  7. Community-based free clinics: opportunities for interprofessional collaboration, health promotion, and complex care management.

    Science.gov (United States)

    Kaeser, Martha A; Hawk, Cheryl; Anderson, Michelle L; Reinhardt, Richard

    2016-03-01

    Free or outreach clinics offer students the opportunity to work with diverse patient populations. The objective of this study was to describe the demographics and clinical characteristics of a sample of chiropractic patients at a free community-based clinic to assess clinical and educational opportunities for students to work with diverse populations, collaborate with other professions and practice health promotion through patient education. This was a prospective, descriptive cross-sectional study conducted over 2 months. Data on demographics, health status, and health risks were collected from patients and their interns. Of the 158 patients, 50.6% were women and 50.6% African-American, while only 20.9% were employed full-time. Of the 24.7% tobacco users, 48.7% expressed interest in cessation. Of 80.0% overweight or obese patients, 48.8% expressed interest in weight loss. By self-report, 16.5% were diabetic, 10.1% took hypertension medication, 36.7% used prescription pain medication (9.4% opiate use), 33.5% used nonprescription pain medication, and 9.4% were under the care of a mental health professional. This patient population is demographically diverse. A high proportion of patients who used tobacco, or were overweight or obese expressed interest in information on those topics. A substantial proportion reported being under care with a mental health professional. This clinic provides opportunities for students to work with diverse populations, collaborate with other professions, and practice health promotion.

  8. NASA HRP Plans for Collaboration at the IBMP Ground-Based Experimental Facility (NEK)

    Science.gov (United States)

    Cromwell, Ronita L.

    2016-01-01

    NASA and IBMP are planning research collaborations using the IBMP Ground-based Experimental Facility (NEK). The NEK offers unique capabilities to study the effects of isolation on behavioral health and performance as it relates to spaceflight. The NEK is comprised of multiple interconnected modules that range in size from 50-250m(sup3). Modules can be included or excluded in a given mission allowing for flexibility of platform design. The NEK complex includes a Mission Control Center for communications and monitoring of crew members. In an effort to begin these collaborations, a 2-week mission is planned for 2017. In this mission, scientific studies will be conducted to assess facility capabilities in preparation for longer duration missions. A second follow-on 2-week mission may be planned for early in 2018. In future years, long duration missions of 4, 8 and 12 months are being considered. Missions will include scenarios that simulate for example, transit to and from asteroids, the moon, or other interplanetary travel. Mission operations will be structured to include stressors such as, high workloads, communication delays, and sleep deprivation. Studies completed at the NEK will support International Space Station expeditions, and future exploration missions. Topics studied will include communication, crew autonomy, cultural diversity, human factors, and medical capabilities.

  9. Towards a team-based, collaborative approach to embedding e-learning within undergraduate nursing programmes.

    Science.gov (United States)

    Kiteley, Robin J; Ormrod, Graham

    2009-08-01

    E-learning approaches are incorporated in many undergraduate nursing programmes but there is evidence to suggest that these are often piecemeal and have little impact on the wider, nurse education curriculum. This is consistent with a broader view of e-learning within the higher education (HE) sector, which suggests that higher education institutions (HEIs) are struggling to make e-learning a part of their mainstream delivery [HEFCE, 2005. HEFCE Strategy for E-Learning 2005/12. Bristol, UK, Higher Education Funding Council for England (HEFCE). [online] Available at: Accessed: 30 May 07]. This article discusses some of the challenges that face contemporary nurse education and seeks to account for reasons as to why e-learning may not be fully embedded within the undergraduate curriculum. These issues are considered within a wider debate about the need to align e-learning approaches with a shift towards a more student focused learning and teaching paradigm. The article goes on to consider broader issues in the literature on the adoption, embedding and diffusion of innovations, particularly in relation to the value of collaboration. A collaborative, team-based approach to e-learning development is considered as a way of facilitating sustainable, responsive and multidisciplinary developments within a field which is constantly changing and evolving.

  10. Collaboratively Exploring the Use of a Video Case-Based Book as a Professional Development Tool

    Science.gov (United States)

    Smithenry, Dennis W.; Prouty, Jessica; Capobianco, Brenda M.

    2012-11-01

    Although the literature contains many examples of extensive professional development (PD) programs, most science teachers experience only a few hours of PD each year. To address this reality, alternative PD delivery tools need to be examined. Since the mid-1990s, video cases have emerged as a flexible form of PD where in-service teachers can repeatedly and vicariously view reform teaching practices enacted within the classroom context. Recently, PD developers have taken video cases to another level by embedding them into print and electronic books. In these video case-based books (VCBBs), the reader is iteratively prompted to watch a video case and read commentaries by the teacher featured in the video. In this study, we used collaborative action research (CAR) to explore what happened when a fourth-year biology teacher attempted to use a VCBB as a PD tool to enact the whole-class inquiry model (presented within the VCBB) into her curriculum. Specifically, we critically examined the extent to which the teacher was able to enact the model, the challenges she experienced, and the manner in which she utilized the VCBB. Our findings indicate that the teacher was able to use the VCBB, in conjunction with CAR, to make significant changes to her teaching practice. The results also point to the possibility of a new PD model where the VCBB provides a "vision" of reform teaching and the collaborative exploration of the VCBB as a PD tool affords the "space" needed to reach that vision.

  11. Improving Healthcare Team Collaboration in Hospital Transfers through Cloud-Based Mobile Systems

    Directory of Open Access Journals (Sweden)

    Andres Neyem

    2016-01-01

    Full Text Available It is a clinical fact that better patient flow management in and between hospitals improves quality of care, resource utilization, and cost efficiency. As the number of patients in hospitals constantly grows, the need for hospital transfers is directly affected. Interhospital transfers can be required for several reasons but they are most commonly made when the diagnostic and therapeutic facilities required for a patient are not available locally. Transferring a critical patient between hospitals is commonly associated with risk of death and complications. This raises the question: How can we improve healthcare team collaboration in hospital transfers through the use of emerging information technology and communication services? This paper presents a cloud-based mobile system for supporting team collaboration and decision-making in the transportation of patients in critical condition. The Rapid Emergency Medicine Score (REMS scale was used as an outcome variable, being a useful scale to assess the risk profile of critical patients requiring transfers between hospitals. This helps medical staff to adopt proper risk-prevention measures when handling a transfer and to react on time if any complications arise in transit.

  12. Optimizing Supply Chain Collaboration Based on Agreement Buyer-Supplier Relationship with Network Design Problem

    Directory of Open Access Journals (Sweden)

    Wahyudi Sutopo

    2016-12-01

    Full Text Available In recent years, the rising competitive environment with shorter product life cycles and high customization forces industries to increase their flexibility, speed up their response, and enhance concurrent engineering designs. To integrate these prospects, supply chain collaboration becomes a pertinent strategy for industries to strengthen their competitiveness. The network design problem is used to implement supply chain collaboration. In the buying and selling process, sharing information between buyer and supplier are important to obtain a transaction decision. The optimimum supply chain profit can be identified by mathematical model of network design problem. The Mathematical Model takes into consideration the uncertainity in negotiation of supply chain, transportation problems, and locationallocation of products from supplier to buyer in the planning based on the time value of money. The results show that the model can be used to optimize the supply chain profit. The supplier gets a profit because income were received in the initial contract, while the buyer profit comes from lower pay.

  13. A robust and novel dynamic-ID-based authentication scheme for care team collaboration with smart cards.

    Science.gov (United States)

    Chang, Ya-Fen; Chen, Chia-Chen; Chang, Pei-Yu

    2013-04-01

    Nowadays, users/patients may gain desired medical services on-line because of the rapid development of computer network technologies. Conventional healthcare services are provided by a single server. However, care team collaboration by integrating services is the key to improve financial and clinical performance. How a user/patient accesses desired medical services provided by multiple servers becomes a challenge to realize care team collaboration. User authentication plays an important role to protect resources or services from being accessed by unauthorized users. In this paper, we first discuss the perceived security drawbacks of pervasive smart-card-based remote user authentication schemes. Then, we propose a novel dynamic-ID-based user authentication scheme based on elliptic curve cryptosystem (ECC) for multi-server environment with smart cards. The proposed scheme ensures user anonymity and computational efficiency and complies with essential requirements of a secure smart-card-based authentication scheme for multi-server environment to enable care team collaboration.

  14. Sustaining Broader Impacts through Researcher-Teacher Collaboration (A Model Based on Award Abstract #1334935: Collaborative Research: Investigating the Ecological Importance of Iron Storage in Diatoms.)

    Science.gov (United States)

    Sutton, M.; Marchetti, A.

    2016-02-01

    Broader impacts have become a vital component of scientific research projects. A variety of outreach avenues are available to assist scientists in reaching larger audiences, however, the translation of cutting-edge scientific content and concepts can be challenging. Collaborating with educators is a viable option to assist researchers in fulfilling NSF's broader impact requirements. A broader impacts model based on collaborations between a teacher and 28 researchers from 14 institutions will demonstrate successful science outreach and engagement through interactions between teachers, researchers, students, and general audiences. Communication styles (i.e., blogs, social media) and outreach data incorporated by researchers and the teacher will be shared to illustrate the magnitude of the broader impacts achieved with this partnership. Inquiry-based investigations and activities developed to translate the science into the classroom will also be demonstrated, including the use of real scientific data collected during the research cruise. "Finding Microbe Needles in a Haystack of Oceans" provides an understanding of how remote sensing technology is used to locate specific ocean environments (e.g. High Nutrient Low Chlorophyll - HNLC) that support diverse microbial food webs. A board game ("Diatom Adventures©") designed to explore the physiology of microbial organisms and microscopic food webs will also be demonstrated. The tentative nature of science requires a constant vigil to stay abreast of the latest hypotheses and discoveries. Researcher/Teacher collaborations allow each professional to focus on his/her strengths while meeting broader impact requirements. These partnerships encourage lifelong learning as educators observe and work with scientists first-hand and then follow appropriate scope, sequence, and pedagogy to assist various audiences in understanding the innovative technologies being used to explore new scientific frontiers.

  15. Telematics-based online client-server/client collaborative environment for radiotherapy planning simulations.

    Science.gov (United States)

    Kum, Oyeon

    2007-11-01

    Customized cancer radiation treatment planning for each patient is very useful for both a patient and a doctor because it provides the ability to deliver higher doses to a more accurately defined tumor and at the same time lower doses to organs at risk and normal tissues. This can be realized by building an accurate planning simulation system to provide better treatment strategies based on each patient's tomographic data such as CT, MRI, PET, or SPECT. In this study, we develop a real-time online client-server/client collaborative environment between the client (health care professionals or hospitals) and the server/client under a secure network using telematics (the integrated use of telecommunications and medical informatics). The implementation is based on a point-to-point communication scheme between client and server/client following the WYSIWIS (what you see is what I see) paradigm. After uploading the patient tomographic data, the client is able to collaborate with the server/client for treatment planning. Consequently, the level of health care services can be improved, specifically for small radiotherapy clinics in rural/remote-country areas that do not possess much experience or equipment such as a treatment planning simulator. The telematics service of the system can also be used to provide continued medical education in radiotherapy. Moreover, the system is easy to use. A client can use the system if s/he is familiar with the Windows(TM) operating system because it is designed and built based on a user-friendly concept. This system does not require the client to continue hardware and software maintenance and updates. These are performed automatically by the server.

  16. iPTF Search for an Optical Counterpart to Gravitational Wave Trigger GW150914

    CERN Document Server

    Kasliwal, M M; Singer, L P; Corsi, A; Cao, Y; Barlow, T; Bhalerao, V; Bellm, E; Cook, D; Duggan, G E; Ferretti, R; Frail, D A; Horesh, A; Kendrick, R; Kulkarni, S R; Lunnan, R; Palliyaguru, N; Laher, R; Masci, F; Manulis, I; Miller, A A; Nugent, P E; Perley, D; Prince, T A; Rana, J; Rebbapragada, U; Sesar, B; Singhal, A; Surace, J; Van Sistine, A

    2016-01-01

    The intermediate Palomar Transient Factory (iPTF) autonomously responded to and promptly tiled the error region of the first gravitational wave event GW150914 to search for an optical counterpart. Only a small fraction of the total localized region was immediately visible in the Northern night sky, due both to sun-angle and elevation constraints. Here, we report on the transient candidates identified and rapid follow-up undertaken to determine the nature of each candidate. Even in the small area imaged of 135 sq. deg., after extensive filtering, 8 candidates were deemed worthy of additional follow-up. Within two hours, all 8 were spectroscopically classified by the Keck II telescope. Curiously, even though such events are rare, one of our candidates was a superluminous supernova. We obtained radio data with the Very Large Array and X-ray follow-up with the Swift satellite for this transient. None of our candidates appear to be associated with the gravitational wave trigger, which is unsurprising given that GW...

  17. Disappearance of the Progenitor of Supernova iPTF13bvn

    CERN Document Server

    Folatelli, Gastón; Kuncarayakti, Hanindyo; Maeda, Keiichi; Bersten, Melina C; Nomoto, Ken'ichi; Pignata, Giuliano; Hamuy, Mario; Quimby, Robert M; Zheng, Weikang; Filippenko, Alexei V; Clubb, Kelsey I; Smith, Nathan; Elias-Rosa, Nancy; Foley, Ryan J; Miller, Adam A

    2016-01-01

    Supernova (SN) iPTF13bvn in NGC 5806 was the first Type Ib SN to have been tentatively associated with a progenitor candidate in pre-explosion images. We performed deep ultraviolet (UV) and optical Hubble Space Telescope (HST) observations of the SN site ~740 days after explosion. We detect an object in the optical bands that is fainter than the pre-explosion object. This dimming is likely not produced by dust absorption in the ejecta; thus, our finding confirms the connection of the progenitor candidate with the SN. The object in our data is likely dominated by the fading SN, which implies that the pre-SN flux is mostly due to the progenitor. We compare our revised pre-SN photometry with previously proposed progenitor models. Although binary progenitors are favored, models need to be refined. In particular, to comply with our deep UV detection limit, any companion star must be less luminous than a late-O star or substantially obscured by newly formed dust. A definitive progenitor characterization will requir...

  18. The Progenitor of Supernova 2011dh/PTF11eon in Messier 51

    CERN Document Server

    Van Dyk, Schuyler D; Cenko, S Bradley; Kasliwal, Mansi M; Horesh, Assaf; Ofek, Eran O; Kraus, Adam L; Silverman, Jeffrey M; Arcavi, Iair; Filippenko, Alexei V; Gal-Yam, Avishay; Quimby, Robert M; Kulkarni, Shrinivas R; Yaron, Ofer; Polishook, David

    2011-01-01

    We have identified the progenitor, or progenitor system, responsible for supernova (SN) 2011dh/PTF11eon, in the nearby, nearly face-on galaxy M51. The available early-time spectra and photometry indicate that it is a stripped-envelope core-collapse SN, of Type IIb or transitional Type II/Ib, possibly similar to the famous SN 1993J in M81. The star was identified in pre-SN archival, multi-band images obtained by the Hubble Space Telescope with the Advanced Camera for Surveys. This identification has been confirmed, to the highest available astrometric precision, using a Keck-II adaptive-optics image. We infer that the extinction to SN 2011dh and its progenitor arises from a low Galactic foreground contribution, and that the SN environment is of solar metallicity. We find that if single, the star is a luminous (absolute V \\approx -7.7 mag) supergiant of effective temperature ~6100 K, bluer than the red supergiants which explode as the more common Type II-Plateau SNe. This requires that the star's hydrogen-rich ...

  19. SN2010jp (PTF10aaxi): A Jet-Driven Type II Supernova

    CERN Document Server

    Smith, Nathan; Butler, Nat; Bloom, Joshua S; Kasliwal, Mansi M; Horesh, Assaf; Kulkarni, Shrinivas R; Law, Nicholas M; Nugent, Peter E; Ofek, Eran O; Poznanski, Dovi; Quimby, Robert M; Sesar, Branimir; Ben-Ami, Sagi; Arcavi, Iair; Gal-Yam, Avishay; Polishook, David; Xu, Dong; Yaron, Ofer; Frail, Dale A; Sullivan, Mark

    2011-01-01

    We present photometry and spectroscopy of the peculiar TypeII supernova (SN) 2010jp, also named PTF10aaxi. The light curve exhibits a linear decline with a relatively low peak absolute magnitude of only -15.9, and a low radioactive decay luminosity at late times that suggests a nickel mass below 0.003 $M_{\\odot}$. Spectra of SN2010jp display an unprecedented triple-peaked H$\\alpha$ line profile, showing: (1) a narrow (800 km/s) central component that suggests shock interaction with dense CSM; (2) high-velocity blue and red emission features centered at -12600 and +15400 km/s; and (3) broad wings extending from -22000 to +25000 km/s. These features persist during 100 days after explosion. We propose that this line profile indicates a bipolar jet-driven explosion, with the central component produced by normal SN ejecta and CSM interaction at mid latitudes, while the high-velocity bumps and broad line wings arise in a nonrelativistic bipolar jet. Two variations of the jet interpretation seem plausible: (1) A fas...

  20. Synthesis of Collaborative Learning Processes with Technology Based Education to Enhance Classroom Teaching

    Science.gov (United States)

    Ghosh, Sumit

    2016-07-01

    A major hurdle in school education in India is the presence of large number of teachers who are inexperienced and have merely taken up the profession of teaching only after exhausting all avenues or getting rejected from all quarters. Empowering and training such teachers with information is a herculean task. Students tend to pay attention and show enthusiasm in learning when they view the class as relevant to themselves and connected to their interests. The current teaching-learning methods for teaching science and astronomy have become obsolete and require a major overhaul. A teaching-learning process which concentrates on an explorative-collaborative-comprehending methodology with simultaneous combination of technology has been developed with the objective to reignite the scientific temper among the future budding scientists. Attaining this goal will be possible when instructors adopt a bottom-up approach, which involves understanding the student's needs, designing flexible course content and synchronizing teaching techniques that focus on increasing student engagement by making the learning experience meaningful and purposeful. The International Year of Light (IYL 2015) is a global initiative that highlights to the citizens of the world the importance of light and optical technologies in their lives, for their futures, and for the development of society. One of the strong legacies left by the 2009 International Year of Astronomy was to use Astronomy in making the world a better place. On the eve of IYL 2015, an Optical Society funded outreach program, 'Spark of Light' was organised for under-privileged school children by using the explorative-collaborative-technology based mechanism and make them understand the nature and properties of light with emphasis on how Astronomy has been crucial for the evolution of sophisticated technology. A major paradigm shift from our previous program was the engagement of such untrained teachers in each and every aspect of

  1. A CLOUD-BASED PLATFORM SUPPORTING GEOSPATIAL COLLABORATION FOR GIS EDUCATION

    Directory of Open Access Journals (Sweden)

    X. Cheng

    2015-05-01

    Full Text Available GIS-related education needs support of geo-data and geospatial software. Although there are large amount of geographic information resources distributed on the web, the discovery, process and integration of these resources are still unsolved. Researchers and teachers always searched geo-data by common search engines but results were not satisfied. They also spent much money and energy on purchase and maintenance of various kinds of geospatial software. Aimed at these problems, a cloud-based geospatial collaboration platform called GeoSquare was designed and implemented. The platform serves as a geoportal encouraging geospatial data, information, and knowledge sharing through highly interactive and expressive graphic interfaces. Researchers and teachers can solve their problems effectively in this one-stop solution. Functions, specific design and implementation details are presented in this paper. Site of GeoSquare is: http://geosquare.tianditu.com/

  2. Facilitating Lewin's change model with collaborative evaluation in promoting evidence based practices of health professionals.

    Science.gov (United States)

    Manchester, Julianne; Gray-Miceli, Deanna L; Metcalf, Judith A; Paolini, Charlotte A; Napier, Anne H; Coogle, Constance L; Owens, Myra G

    2014-12-01

    Evidence based practices (EBPs) in clinical settings interact with and adapt to host organizational characteristics. The contextual factors themselves, surrounding health professions' practices, also adapt as practices become sustained. The authors assert the need for better planning models toward these contextual factors, the influence of which undergird a well-documented science to practice gap in literature on EBPs. The mechanism for EBP planners to anticipate contextual effects as programs Unfreeze their host settings, create Movement, and become Refrozen (Lewin, 1951) is present in Lewin's 3-step change model. Planning for contextual change appears equally important as planning for the actual practice outcomes among providers and patients. Two case studies from a Geriatric Education Center network will illustrate the synthesis of Lewin's three steps with collaborative evaluation principles. The use of the model may become an important tool for continuing education evaluators or organizations beginning a journey toward EBP demonstration projects in clinical settings.

  3. Web-based Learning and Computer Supported Collaborative Learning for psychomotor skill acquisition: perspectives of medical undergraduate students.

    Science.gov (United States)

    Koh, Jansen; Cheung, Jeffrey J H; Mackinnon, Kim; Brett, Clare; Kapralos, Bill; Dubrowski, Adam

    2013-01-01

    There is a lack of evidence for the use of Web-based Learning (WBL) and Computer Supported Collaborative Learning (CSCL) for acquiring psychomotor skills in medical education. In this study, we surveyed medical undergraduate students attending a simulation based training session for central line insertion on their perspectives and utilization of WBL and CSCL for acquisition of a complex psychomotor skill.

  4. An Early Childhood Collaboration Project in India. Cross-Continent Training of Trainers: A Relationship-Based Approach

    Science.gov (United States)

    Stine, Helen; Aviles, Jill; McCreedy, Barbara; Rajesh, Anubha; Sethi, Ridhi; Gupta, Vini

    2007-01-01

    When a Virginia-based international consulting company extended its early education services to India, a model of collaborative, interactive training--Training of Trainers--was born. To apply the principles of quality early childhood education in India, training must be meaningful, sustainable, and relationship based. In this article,…

  5. The Development of Web-Based Collaborative Training Model for Enhancing Human Performances on ICT for Students in Banditpattanasilpa Institute

    Science.gov (United States)

    Pumipuntu, Natawut; Kidrakarn, Pachoen; Chetakarn, Somchock

    2015-01-01

    This research aimed to develop the model of Web-based Collaborative (WBC) Training model for enhancing human performances on ICT for students in Banditpattanasilpa Institute. The research is divided into three phases: 1) investigating students and teachers' training needs on ICT web-based contents and performance, 2) developing a web-based…

  6. The Development of Web-Based Collaborative Training Model for Enhancing Human Performances on ICT for Students in Banditpattanasilpa Institute

    Science.gov (United States)

    Pumipuntu, Natawut; Kidrakarn, Pachoen; Chetakarn, Somchock

    2015-01-01

    This research aimed to develop the model of Web-based Collaborative (WBC) Training model for enhancing human performances on ICT for students in Banditpattanasilpa Institute. The research is divided into three phases: 1) investigating students and teachers' training needs on ICT web-based contents and performance, 2) developing a web-based…

  7. Assessing Online Textual Feedback to Support Student Intrinsic Motivation Using a Collaborative Text-Based Dialogue System: A Qualitative Study

    Science.gov (United States)

    Shroff, Ronnie H.; Deneen, Christopher

    2011-01-01

    This paper assesses textual feedback to support student intrinsic motivation using a collaborative text-based dialogue system. A research model is presented based on research into intrinsic motivation, and the specific construct of feedback provides a framework for the model. A qualitative research methodology is used to validate the model.…

  8. A Case for Increasing Empirical Attention to Head Start's Home-Based Program: An Exploration of Routine Collaborative Goal Setting

    Science.gov (United States)

    Manz, Patricia H.; Lehtinen, Jaana; Bracaliello, Catherine

    2013-01-01

    Collaborative goal setting among home visitors and family members is a mandate for Head Start's home-based program. Yet, a dearth of research is available for advancing evidence-based practices for setting and monitoring home visiting goals or for understanding how family characteristics or program features are associated with them. With the…

  9. The Video Collaborative Localization of a Miner’s Lamp Based on Wireless Multimedia Sensor Networks for Underground Coal Mines

    Directory of Open Access Journals (Sweden)

    Kaiming You

    2015-09-01

    Full Text Available Based on wireless multimedia sensor networks (WMSNs deployed in an underground coal mine, a miner’s lamp video collaborative localization algorithm was proposed to locate miners in the scene of insufficient illumination and bifurcated structures of underground tunnels. In bifurcation area, several camera nodes are deployed along the longitudinal direction of tunnels, forming a collaborative cluster in wireless way to monitor and locate miners in underground tunnels. Cap-lamps are regarded as the feature of miners in the scene of insufficient illumination of underground tunnels, which means that miners can be identified by detecting their cap-lamps. A miner’s lamp will project mapping points on the imaging plane of collaborative cameras and the coordinates of mapping points are calculated by collaborative cameras. Then, multiple straight lines between the positions of collaborative cameras and their corresponding mapping points are established. To find the three-dimension (3D coordinate location of the miner’s lamp a least square method is proposed to get the optimal intersection of the multiple straight lines. Tests were carried out both in a corridor and a realistic scenario of underground tunnel, which show that the proposed miner’s lamp video collaborative localization algorithm has good effectiveness, robustness and localization accuracy in real world conditions of underground tunnels.

  10. The comparative effect of individually-generated vs. collaboratively-generated computer-based concept mapping on science concept learning

    Science.gov (United States)

    Kwon, So Young

    Using a quasi-experimental design, the researcher investigated the comparative effects of individually-generated and collaboratively-generated computer-based concept mapping on middle school science concept learning. Qualitative data were analyzed to explain quantitative findings. One hundred sixty-one students (74 boys and 87 girls) in eight, seventh grade science classes at a middle school in Southeast Texas completed the entire study. Using prior science performance scores to assure equivalence of student achievement across groups, the researcher assigned the teacher's classes to one of the three experimental groups. The independent variable, group, consisted of three levels: 40 students in a control group, 59 students trained to individually generate concept maps on computers, and 62 students trained to collaboratively generate concept maps on computers. The dependent variables were science concept learning as demonstrated by comprehension test scores, and quality of concept maps created by students in experimental groups as demonstrated by rubric scores. Students in the experimental groups received concept mapping training and used their newly acquired concept mapping skills to individually or collaboratively construct computer-based concept maps during study time. The control group, the individually-generated concept mapping group, and the collaboratively-generated concept mapping group had equivalent learning experiences for 50 minutes during five days, excepting that students in a control group worked independently without concept mapping activities, students in the individual group worked individually to construct concept maps, and students in the collaborative group worked collaboratively to construct concept maps during their study time. Both collaboratively and individually generated computer-based concept mapping had a positive effect on seventh grade middle school science concept learning but neither strategy was more effective than the other. However

  11. Essential features influencing collaboration in team-based non-specific back pain rehabilitation: Findings from a mixed methods study.

    Science.gov (United States)

    Hellman, Therese; Jensen, Irene; Bergström, Gunnar; Brämberg, Elisabeth Björk

    2016-05-01

    The aim of the study presented in this article was to explore how professionals, without guidelines for implementing interprofessional teamwork, experience the collaboration within team-based rehabilitation for people with back pain and how this collaboration influences their clinical practice. This study employed a mixed methods design. A questionnaire was answered by 383 participants and 17 participants were interviewed. The interviews were analysed using content analysis. The quantitative results showed that the participants were satisfied with their team-based collaboration. Thirty percent reported that staff changes in the past year had influenced their clinical practice, of which 57% reported that these changes had had negative consequences. The qualitative findings revealed that essential features for an effective collaboration were shared basic values and supporting each other. Furthermore, aspects such as having enough time for reflection, staff continuity, and a shared view of the team members' roles were identified as aspects which influenced the clinical practice. Important clinical implications for nurturing and developing a collaboration in team-based rehabilitation are to create shared basic values and a unified view of all team members' roles and their contributions to the team. These aspects need to be emphasised on an ongoing basis and not only when the team is formed.

  12. Supply Chain Collaboration Risk Evaluation Based on Trapezoidal Fuzzy Numbers Similarity

    OpenAIRE

    Lei Wen; Wei Zhao; Rui Wang

    2013-01-01

    Supply chains are confronted with more complicated risks on the current financial crisis, as makes risk control in supply chain management more exigent. Supply chain collaboration, as the important part of supply chain management, is the key method of improving supply chains profits. This study introduces risk management into the mechanism of supply chain collaboration. In supply chain risk management, supply chain collaboration risk is recognized as an important section which can help SCM mo...

  13. Project-Based Collaborative Engineering Design and Manufacturing Learning with PLM Tools

    Science.gov (United States)

    Vila, Carlos; Abellán, José Vicente; Estruch, Antonio M.; Bruscas, Gracia M.

    In this work we present an educational experience that is focused on teaching collaborative practices for product design. The paper compares two different approaches for engineering education. In the first one each team has to develop a product by collaborating in each product lifecycle stage. The second approach involves collaboration and competition between teams since they participate in different stages of each product’s development.

  14. Designing the RiverCare knowledge base and web-collaborative platform to exchange knowledge in river management

    Science.gov (United States)

    Cortes Arevalo, Juliette; den Haan, Robert-Jan; van der Voort, Mascha; Hulscher, Suzanne

    2016-04-01

    Effective communication strategies are necessary between different scientific disciplines, practitioners and non-experts for a shared understanding and better implementation of river management measures. In that context, the RiverCare program aims to get a better understanding of riverine measures that are being implemented towards self-sustaining multifunctional rivers in the Netherlands. During the RiverCare program, user committees are organized between the researchers and practitioners to discuss the aim and value of RiverCare outputs, related assumptions and uncertainties behind scientific results. Beyond the RiverCare program end, knowledge about river interventions, integrated effects, management and self-sustaining applications will be available to experts and non-experts by means of River Care communication tools: A web-collaborative platform and a serious gaming environment. As part of the communication project of RiverCare, we are designing the RiverCare web-collaborative platform and the knowledge-base behind that platform. We aim at promoting collaborative efforts and knowledge exchange in river management. However, knowledge exchange does not magically happen. Consultation and discussion of RiverCare outputs as well as elicitation of perspectives and preferences from different actors about the effects of riverine measures has to be facilitated. During the RiverCare research activities, the platform will support the user committees or collaborative sessions that are regularly held with the organizations directly benefiting from our research, at project level or in study areas. The design process of the collaborative platform follows an user centred approach to identify user requirements, co-create a conceptual design and iterative develop and evaluate prototypes of the platform. The envisioned web-collaborative platform opens with an explanation and visualisation of the RiverCare outputs that are available in the knowledge base. Collaborative sessions

  15. Collaborative Learning in the Cloud

    DEFF Research Database (Denmark)

    Kirchner, Kathrin; Razmerita, Liana

    2015-01-01

    This present study aims to investigate how students perceive collaboration and identifies associated technologies used to collaborate. In particular we aim to address the following research questions: What are the factors that impact satisfaction with collaboration? How do these factors differ...... in different collaborative settings? Based on data from 75 students from Denmark and Germany, the article identifies collaborative practices and factors that impact positively and negatively satisfaction with collaboration....

  16. A Timed Colored Petri Net Simulation-Based Self-Adaptive Collaboration Method for Production-Logistics Systems

    Directory of Open Access Journals (Sweden)

    Zhengang Guo

    2017-03-01

    Full Text Available Complex and customized manufacturing requires a high level of collaboration between production and logistics in a flexible production system. With the widespread use of Internet of Things technology in manufacturing, a great amount of real-time and multi-source manufacturing data and logistics data is created, that can be used to perform production-logistics collaboration. To solve the aforementioned problems, this paper proposes a timed colored Petri net simulation-based self-adaptive collaboration method for Internet of Things-enabled production-logistics systems. The method combines the schedule of token sequences in the timed colored Petri net with real-time status of key production and logistics equipment. The key equipment is made ‘smart’ to actively publish or request logistics tasks. An integrated framework based on a cloud service platform is introduced to provide the basis for self-adaptive collaboration of production-logistics systems. A simulation experiment is conducted by using colored Petri nets (CPN Tools to validate the performance and applicability of the proposed method. Computational experiments demonstrate that the proposed method outperforms the event-driven method in terms of reductions of waiting time, makespan, and electricity consumption. This proposed method is also applicable to other manufacturing systems to implement production-logistics collaboration.

  17. Team-Based Development of Medical Devices: An Engineering–Business Collaborative

    Science.gov (United States)

    Eberhardt, Alan W.; Johnson, Ophelia L.; Kirkland, William B.; Dobbs, Joel H.; Moradi, Lee G.

    2016-01-01

    There is a global shift in the teaching methodology of science and engineering toward multidisciplinary, team-based processes. To meet the demands of an evolving technical industry and lead the way in engineering education, innovative curricula are essential. This paper describes the development of multidisciplinary, team-based learning environments in undergraduate and graduate engineering curricula focused on medical device design. In these programs, students actively collaborate with clinicians, professional engineers, business professionals, and their peers to develop innovative solutions to real-world problems. In the undergraduate senior capstone courses, teams of biomedical engineering (BME) and business students have produced and delivered numerous functional prototypes to satisfied clients. Pursuit of commercialization of devices has led to intellectual property (IP) disclosures and patents. Assessments have indicated high levels of success in attainment of student learning outcomes and student satisfaction with their undergraduate design experience. To advance these projects toward commercialization and further promote innovative team-based learning, a Master of Engineering (MEng) in Design and Commercialization was recently launched. The MEng facilitates teams of graduate students in engineering, life sciences, and business who engage in innovation-commercialization (IC) projects and coursework that take innovative ideas through research and development (R&D) to create marketable devices. The activities are structured with students working together as a “virtual company,” with targeted outcomes of commercialization (license agreements and new start-ups), competitive job placement, and/or career advancement. PMID:26902869

  18. Team-Based Development of Medical Devices: An Engineering-Business Collaborative.

    Science.gov (United States)

    Eberhardt, Alan W; Johnson, Ophelia L; Kirkland, William B; Dobbs, Joel H; Moradi, Lee G

    2016-07-01

    There is a global shift in the teaching methodology of science and engineering toward multidisciplinary, team-based processes. To meet the demands of an evolving technical industry and lead the way in engineering education, innovative curricula are essential. This paper describes the development of multidisciplinary, team-based learning environments in undergraduate and graduate engineering curricula focused on medical device design. In these programs, students actively collaborate with clinicians, professional engineers, business professionals, and their peers to develop innovative solutions to real-world problems. In the undergraduate senior capstone courses, teams of biomedical engineering (BME) and business students have produced and delivered numerous functional prototypes to satisfied clients. Pursuit of commercialization of devices has led to intellectual property (IP) disclosures and patents. Assessments have indicated high levels of success in attainment of student learning outcomes and student satisfaction with their undergraduate design experience. To advance these projects toward commercialization and further promote innovative team-based learning, a Master of Engineering (MEng) in Design and Commercialization was recently launched. The MEng facilitates teams of graduate students in engineering, life sciences, and business who engage in innovation-commercialization (IC) projects and coursework that take innovative ideas through research and development (R&D) to create marketable devices. The activities are structured with students working together as a "virtual company," with targeted outcomes of commercialization (license agreements and new start-ups), competitive job placement, and/or career advancement.

  19. Multidisciplinary Inverse Reliability Analysis Based on Collaborative Optimization with Combination of Linear Approximations

    Directory of Open Access Journals (Sweden)

    Xin-Jia Meng

    2015-01-01

    Full Text Available Multidisciplinary reliability is an important part of the reliability-based multidisciplinary design optimization (RBMDO. However, it usually has a considerable amount of calculation. The purpose of this paper is to improve the computational efficiency of multidisciplinary inverse reliability analysis. A multidisciplinary inverse reliability analysis method based on collaborative optimization with combination of linear approximations (CLA-CO is proposed in this paper. In the proposed method, the multidisciplinary reliability assessment problem is first transformed into a problem of most probable failure point (MPP search of inverse reliability, and then the process of searching for MPP of multidisciplinary inverse reliability is performed based on the framework of CLA-CO. This method improves the MPP searching process through two elements. One is treating the discipline analyses as the equality constraints in the subsystem optimization, and the other is using linear approximations corresponding to subsystem responses as the replacement of the consistency equality constraint in system optimization. With these two elements, the proposed method realizes the parallel analysis of each discipline, and it also has a higher computational efficiency. Additionally, there are no difficulties in applying the proposed method to problems with nonnormal distribution variables. One mathematical test problem and an electronic packaging problem are used to demonstrate the effectiveness of the proposed method.

  20. Collaborative spectrum sensing based on the ratio between largest eigenvalue and Geometric mean of eigenvalues

    KAUST Repository

    Shakir, Muhammad

    2011-12-01

    In this paper, we introduce a new detector referred to as Geometric mean detector (GEMD) which is based on the ratio of the largest eigenvalue to the Geometric mean of the eigenvalues for collaborative spectrum sensing. The decision threshold has been derived by employing Gaussian approximation approach. In this approach, the two random variables, i.e. The largest eigenvalue and the Geometric mean of the eigenvalues are considered as independent Gaussian random variables such that their cumulative distribution functions (CDFs) are approximated by a univariate Gaussian distribution function for any number of cooperating secondary users and received samples. The approximation approach is based on the calculation of exact analytical moments of the largest eigenvalue and the Geometric mean of the eigenvalues of the received covariance matrix. The decision threshold has been calculated by exploiting the CDF of the ratio of two Gaussian distributed random variables. In this context, we exchange the analytical moments of the two random variables with the moments of the Gaussian distribution function. The performance of the detector is compared with the performance of the energy detector and eigenvalue ratio detector. Analytical and simulation results show that our newly proposed detector yields considerable performance advantage in realistic spectrum sensing scenarios. Moreover, our results based on proposed approximation approach are in perfect agreement with the empirical results. © 2011 IEEE.