WorldWideScience

Sample records for tutoring multiple bugs

  1. Bed Bugs - Multiple Languages

    Science.gov (United States)

    ... Are Here: Home → Multiple Languages → All Health Topics → Bed Bugs URL of this page: https://medlineplus.gov/languages/ ... V W XYZ List of All Topics All Bed Bugs - Multiple Languages To use the sharing features on ...

  2. Waveform library for chinch bugs (Heteroptera: Blissidae): Characterization of EPG waveforms at multiple input impedances

    Science.gov (United States)

    Chinch bugs, Blissus spp. (Heteroptera: Blissidae), are among the most serious pests of grasses in North America. Southern chinch bug, B. insularis Barber, is the most economically important pest on St. Augustinegrass, the primary lawn grass in Florida. Western chinch bug, B. occiduus Barber, is ...

  3. The Multiple Demands of a Tutor Coordinator: How To Balance a Very Split-Personality Job.

    Science.gov (United States)

    Thot, Iris Dolores

    The author of this article describes the various aspects of her job as the Modern Language Tutor Coordinator at Santa Monica College. The author writes that, in general, her days consist of wearing a number of different hats each day, including that of budget and payroll administrator, grant writer, tutor screener, tutor trainer, tutor employer,…

  4. Multiple mating in the traumatically inseminating Warehouse pirate bug, Xylocoris flavipes: effects on fecundity and longevity.

    Science.gov (United States)

    Backhouse, Amy; Sait, Steven M; Cameron, Tom C

    2012-10-23

    Optimal mating frequencies differ between sexes as a consequence of the sexual differentiation of reproductive costs per mating, where mating is normally more costly to females than males. In mating systems where sexual reproduction is costly to females, sexual conflict may cause both direct (i.e. by reducing female fecundity or causing mortality) and indirect (i.e. increased risk of mortality, reduced offspring viability) reductions in lifetime reproductive success of females, which have individual and population consequences. We investigated the direct and indirect costs of multiple mating in a traumatically inseminating (TI) predatory Warehouse pirate bug, Xylocoris flavipes (Reuter) (Hemiptera: Anthocoridae), where the male penetrates the female's abdomen during copulation. This study aimed to quantify the effects of TI on female fecundity, egg viability, the lifetime fecundity schedule, longevity and prey consumption in this cosmopolitan biocontrol agent. We found no difference in the total reproductive output between mating treatments in terms of total eggs laid or offspring viability, but there were significant differences found in daily fecundity schedules and adult longevity. In terms of lifetime reproduction, female Warehouse pirate bugs appear to be adapted to compensate for the costs of TI mating to their longevity.

  5. Elevated metabolic dextoxification associated with multiple/cross resistance to defferent insecticide classes in tarnished plant bug

    Science.gov (United States)

    Tarnished plant bugs (TPB, Lygus lineolaris) were collected from multiple locations in the Delta regions of Mississippi, Arkansas, and Louisiana (covering 200 miles in E-W and N-S directions), and were subjected to bioassays to acephate, imidacloprid, dicrotophos, thiamethoxam, and sulfoxaflor (repr...

  6. Bed Bugs

    Science.gov (United States)

    Prevent, identify, and treat bed bug infestations using EPA’s step-by-step guides, based on IPM principles. Find pesticides approved for bed bug control, check out the information clearinghouse, and dispel bed bug myths.

  7. Comparison of multiple steam treatment durations for control of bed bugs (Cimex lectularius L.).

    Science.gov (United States)

    Puckett, Robert T; McDonald, Danny L; Gold, Roger E

    2013-09-01

    The factors contributing to the current resurgence of bed bug Cimex lectularius L. populations across the United States and elsewhere include, among others, the development of resistance to chemical insecticides and population management practices. This has led to the development and attempted refinement of many non-chemical control methods that contribute to an IPM approach to solving the current bed bug population density increase in urban dwellings. One such approach is the use of heat in the form of steam to provide an effective mechanism for controlling localized infestations of bed bugs. The work reported herein was designed to refine our understanding of the duration of bed bug/steam contact necessary to affect mortality of bed bugs in laboratory trials. Beg bug eggs, nymphs and adults were exposed to three steam treatment exposure periods in these trials. Mean percentage mortality of bed bug eggs was 100% (regardless of duration of exposure), and that of nymphs and adults ranged from 88.0 to 94.0%. Survivorship of nymphs and adults in the trials was the result of experimental protocol restrictions that would not usually be associated with actual pest management efforts. The treatment equipment used in these trials is portable and relatively inexpensive and represents a non-chemical means of killing all life stages of bed bugs. While this method would likely be seen as an inefficient means of remediating a mature bed bug infestation within a structure, it does represent a practical component of integrated management of this pest insect. © 2012 Society of Chemical Industry.

  8. Architecture for an Adaptive and Intelligent Tutoring System That Considers the Learner's Multiple Intelligences

    Science.gov (United States)

    Hafidi, Mohamed; Bensebaa, Taher

    2015-01-01

    The majority of adaptive and intelligent tutoring systems (AITS) are dedicated to a specific domain, allowing them to offer accurate models of the domain and the learner. The analysis produced from traces left by the users is didactically very precise and specific to the domain in question. It allows one to guide the learner in case of difficulty…

  9. 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)

  10. AutoTutor and Family: A Review of 17 Years of Natural Language Tutoring

    Science.gov (United States)

    Nye, Benjamin D.; Graesser, Arthur C.; Hu, Xiangen

    2014-01-01

    AutoTutor is a natural language tutoring system that has produced learning gains across multiple domains (e.g., computer literacy, physics, critical thinking). In this paper, we review the development, key research findings, and systems that have evolved from AutoTutor. First, the rationale for developing AutoTutor is outlined and the advantages…

  11. Does supporting multiple student strategies lead to greater learning and motivation? Investigating a source of complexity in the architecture of intelligent tutoring systems

    NARCIS (Netherlands)

    Waalkens, Maaike; Aleven, Vincent; Taatgen, Niels

    Intelligent tutoring systems (ITS) support students in learning a complex problem-solving skill. One feature that makes an ITS architecturally complex, and hard to build, is support for strategy freedom, that is, the ability to let students pursue multiple solution strategies within a given problem.

  12. Does Supporting Multiple Student Strategies Lead to Greater Learning and Motivation? Investigating a Source of Complexity in the Architecture of Intelligent Tutoring Systems

    Science.gov (United States)

    Waalkens, Maaike; Aleven, Vincent; Taatgen, Niels

    2013-01-01

    Intelligent tutoring systems (ITS) support students in learning a complex problem-solving skill. One feature that makes an ITS architecturally complex, and hard to build, is support for strategy freedom, that is, the ability to let students pursue multiple solution strategies within a given problem. But does greater freedom mean that students…

  13. Does supporting multiple student strategies lead to greater learning and motivation? Investigating a source of complexity in the architecture of intelligent tutoring systems

    NARCIS (Netherlands)

    Waalkens, Maaike; Aleven, Vincent; Taatgen, Niels

    2013-01-01

    Intelligent tutoring systems (ITS) support students in learning a complex problem-solving skill. One feature that makes an ITS architecturally complex, and hard to build, is support for strategy freedom, that is, the ability to let students pursue multiple solution strategies within a given problem.

  14. Deep sequencing of pyrethroid-resistant bed bugs reveals multiple mechanisms of resistance within a single population.

    Science.gov (United States)

    Adelman, Zach N; Kilcullen, Kathleen A; Koganemaru, Reina; Anderson, Michelle A E; Anderson, Troy D; Miller, Dini M

    2011-01-01

    A frightening resurgence of bed bug infestations has occurred over the last 10 years in the U.S. and current chemical methods have been inadequate for controlling this pest due to widespread insecticide resistance. Little is known about the mechanisms of resistance present in U.S. bed bug populations, making it extremely difficult to develop intelligent strategies for their control. We have identified bed bugs collected in Richmond, VA which exhibit both kdr-type (L925I) and metabolic resistance to pyrethroid insecticides. Using LD(50) bioassays, we determined that resistance ratios for Richmond strain bed bugs were ∼5200-fold to the insecticide deltamethrin. To identify metabolic genes potentially involved in the detoxification of pyrethroids, we performed deep-sequencing of the adult bed bug transcriptome, obtaining more than 2.5 million reads on the 454 titanium platform. Following assembly, analysis of newly identified gene transcripts in both Harlan (susceptible) and Richmond (resistant) bed bugs revealed several candidate cytochrome P450 and carboxylesterase genes which were significantly over-expressed in the resistant strain, consistent with the idea of increased metabolic resistance. These data will accelerate efforts to understand the biochemical basis for insecticide resistance in bed bugs, and provide molecular markers to assist in the surveillance of metabolic resistance.

  15. Deep sequencing of pyrethroid-resistant bed bugs reveals multiple mechanisms of resistance within a single population.

    Directory of Open Access Journals (Sweden)

    Zach N Adelman

    Full Text Available A frightening resurgence of bed bug infestations has occurred over the last 10 years in the U.S. and current chemical methods have been inadequate for controlling this pest due to widespread insecticide resistance. Little is known about the mechanisms of resistance present in U.S. bed bug populations, making it extremely difficult to develop intelligent strategies for their control. We have identified bed bugs collected in Richmond, VA which exhibit both kdr-type (L925I and metabolic resistance to pyrethroid insecticides. Using LD(50 bioassays, we determined that resistance ratios for Richmond strain bed bugs were ∼5200-fold to the insecticide deltamethrin. To identify metabolic genes potentially involved in the detoxification of pyrethroids, we performed deep-sequencing of the adult bed bug transcriptome, obtaining more than 2.5 million reads on the 454 titanium platform. Following assembly, analysis of newly identified gene transcripts in both Harlan (susceptible and Richmond (resistant bed bugs revealed several candidate cytochrome P450 and carboxylesterase genes which were significantly over-expressed in the resistant strain, consistent with the idea of increased metabolic resistance. These data will accelerate efforts to understand the biochemical basis for insecticide resistance in bed bugs, and provide molecular markers to assist in the surveillance of metabolic resistance.

  16. The Complete Tutor.

    Science.gov (United States)

    Gardner, Howard

    2000-01-01

    Explains the relationship between computers and multiple intelligences and explores its potential. Topics include behaviorism and cognitivism; constructivism; multiple representations in the human mind, including various forms of intelligence; individual differences; the challenge of altering early representations; and machine versus human tutors.…

  17. The Complete Tutor.

    Science.gov (United States)

    Gardner, Howard

    2000-01-01

    Explains the relationship between computers and multiple intelligences and explores its potential. Topics include behaviorism and cognitivism; constructivism; multiple representations in the human mind, including various forms of intelligence; individual differences; the challenge of altering early representations; and machine versus human tutors.…

  18. How Should Intelligent Tutoring Systems Sequence Multiple Graphical Representations of Fractions? A Multi-Methods Study

    Science.gov (United States)

    Rau, M. A.; Aleven, V.; Rummel, N.; Pardos, Z.

    2014-01-01

    Providing learners with multiple representations of learning content has been shown to enhance learning outcomes. When multiple representations are presented across consecutive problems, we have to decide in what sequence to present them. Prior research has demonstrated that interleaving "tasks types" (as opposed to blocking them) can…

  19. Predicting Bugs' Components via Mining Bug Reports

    CERN Document Server

    Wang, Deqing; Liu, Rui; Lin, Mengxiang; Wu, Wenjun; Hu, Hongping

    2010-01-01

    The number of bug reports in complex software increases dramatically. Now bugs are triaged manually, bug triage or assignment is a labor-intensive and time-consuming task. Without knowledge about the structure of the software, testers often specify the component of a new bug wrongly. Meanwhile, it is difficult for triagers to determine the component of the bug only by its description. We dig out the components of 28,829 bugs in Eclipse bug project have been specified wrongly and modified at least once. It results in these bugs have to be reassigned and delays the process of bug fixing. The average time of fixing wrongly-specified bugs is longer than that of correctly-specified ones. In order to solve the problem automatically, we use historical fixed bug reports as training corpus and build classifiers based on support vector machines and Na\\"ive Bayes to predict the component of a new bug. The best prediction accuracy reaches up to 81.21% on our validation corpus of Eclipse project. Averagely our predictive ...

  20. Collaborative Strategy on Bed Bugs

    Science.gov (United States)

    The Collaborative Strategy on Bed Bugs was developed by the Federal Bed Bug Workgroup to clarify the federal role in bed bug control and highlight ways that government, community, academia and private industry can work together on bed bug issues.

  1. Introduction to Bed Bugs

    Science.gov (United States)

    ... that there are ways to control bed bugs. Getting good, solid information is the first step in both prevention and control. While there is no chemical quick fix, there are effective strategies to control bed bugs involving both non-chemical and chemical methods. Bed bugs can be hard to find and ...

  2. Bug Prioritization to Facilitate Bug Report Triage

    Institute of Scientific and Technical Information of China (English)

    Jaweria Kanwal; Onaiza Maqbool

    2012-01-01

    The large number of new bug reports received in bug repositories of software systems makes their management a challenging task.Handling these reports manually is time consuming,and often results in delaying the resolution of important bugs. To address this issue,a recommender may be developed which automatically prioritizes the new bug reports.In this paper,we propose and evaluate a classification based approach to build such a recommender.We use the Na(ǐ)ve Bayes and Support Vector Machine (SVM) classifiers,and present a comparison to evaluate which classifier performs better in terms of accuracy.Since a bug report contains both categorical and text features,another evaluation we perform is to determine the combination of features that better determines the priority of a bug.To evaluate the bug priority recommender,we use precision and recall measures and also propose two new measures,Nearest False Negatives (NFN) and Nearest False Positives (NFP),which provide insight into the results produced by precision and recall.Our findings are that the results of SVM are better than the Na(ǐ)ve Bayes algorithm for text features,whereas for categorical features,Na(ǐ)ve Bayes performance is better than SVM.The highest accurácy is achieved with SVM when categorical and text features are combined for training.

  3. A tutoring package to teach pronunciation of Mandarin Chinese characters.

    Science.gov (United States)

    Wu, Hang; Miller, L Keith

    2007-01-01

    We examined the effects of a tutoring package (verbal modeling, prompts, and contingent praise/ Chinese conversations with the tutor) on the performance of a college student's Mandarin Chinese pronunciation. The effects of the tutoring package were analyzed using a multiple baseline design across two sets of 50 Chinese characters. The tutoring package produced improvement in the student's correct pronunciation of Chinese characters from 48% (pretutoring) to 90% (posttutoring). Results suggested that the tutoring package produced mastery pronunciation of targeted Mandarin Chinese vocalizations by a nonnative speaker.

  4. Sex attractant pheromone of the red-shouldered stink bug Thyanta pallidovirens: a pheromone blend with multiple redundant components.

    Science.gov (United States)

    McBrien, H L; Millar, J G; Rice, R E; McElfresh, J S; Cullen, E; Zalom, F G

    2002-09-01

    The male-produced sex pheromone of the red-shouldered stink bug, Thyanta pallidovirens (Stål) (Hemiptera: Pentatomidae) consists of a blend of methyl (E2,Z4,Z6)-decatrienoate (E2,Z4,Z6-10:COOMe), and the sesquiterpenes (+)-alpha-curcumene, (-)-zingiberene, and (-)-beta-sesquiphellandrene. In laboratory bioassays, sexually mature males attracted sexually mature females but not males, and females did not attract either sex. Extracts of volatiles collected from sexually mature males contained compounds not present in extracts from females or sexually immature males, and male-produced extract was attractive to females. Biological activity was lost when the extract was fractionated, indicating that the pheromone consisted of at least two components having different chemical properties. Individually, pheromone components were not attractive to females, but E2,Z4,Z6-10:COOMe in combination with at least one of the three male-produced sesquiterpenes was attractive. The presence of more than one sesquiterpene in the blend did not increase attraction, indicating redundancy in the pheromone signal. Male extract was as attractive as a blend reconstructed from synthesized compounds, indicating all biologically active components had been identified. In bioassays conducted at dusk in a 1- x 1- x 1-m screen field cage, females were attracted to synthetic pheromone lures. In field trials, adult female T pallidovirens were attracted to pheromone-baited traps in relatively low numbers. The profile of volatiles released by sexually mature males of a congeneric species, Thyanta accerra custator McAtee, was remarkably similar to that of male T. pallidovirens, with the exception that the former species produced (E)-2-decenal, a compound that was not found in T. pallidovirens extracts.

  5. Strategic Tutor Monitoring.

    Science.gov (United States)

    Chee-kwong, Kenneth Chao

    1996-01-01

    Discusses effective tutor monitoring strategies based on experiences at the Open Learning Institute of Hong Kong. Highlights include key performance and strategic control points; situational factors, including tutor expectations and relevant culture; Theory X versus Theory Y leadership theories; and monitoring relationships with tutors. (LRW)

  6. Strategic Tutor Monitoring.

    Science.gov (United States)

    Chee-kwong, Kenneth Chao

    1996-01-01

    Discusses effective tutor monitoring strategies based on experiences at the Open Learning Institute of Hong Kong. Highlights include key performance and strategic control points; situational factors, including tutor expectations and relevant culture; Theory X versus Theory Y leadership theories; and monitoring relationships with tutors. (LRW)

  7. Bug City: Beetles [Videotape].

    Science.gov (United States)

    1998

    "Bug City" is a video series created to help children learn about insects and other small critters. All aspects of bug life are touched upon including body structure, food, habitat, life cycle, mating habits, camouflage, mutualism (symbiosis), adaptations, social behavior, and more. Each program features dramatic microscopic photography,…

  8. The main component of an alarm pheromone of kissing bugs plays multiple roles in the cognitive modulation of the escape response

    Directory of Open Access Journals (Sweden)

    Sebastián eMinoli

    2013-07-01

    Full Text Available Innate responses in animals can be modulated by experience. Disturbed adults of the triatomine bug Triatoma infestans release an alarm pheromone (AP that elicits an escape response in conspecific larvae. The main component of this AP, the isobutyric acid (IsoAc, alone has already shown to generate an escape response in this species. However, not much is known about the modulation of this behavior by non-associative and associative cognitive processes. We present here evidences of the cognitive capacities of T. infestans larvae in an escape context under different conditioning paradigms, including IsoAc in different roles. We show that: 1 the duration of a pre-exposure to IsoAc plays a main role in determining the type of non-associative learning expressed: short time pre-exposures elicit a sensitization while a longer pre-exposure time triggers a switch from repellence to attractiveness; 2 a simple pre-exposure event is enough to modulate the escape response of larvae to the AP and to its main component: IsoAc; 3 IsoAc and the AP are perceived as different chemical entities; 4 an association between IsoAc and an aversive stimulus can be created under a classical conditioning paradigm; 5 an association between IsoAc and a self-action can be generated under an operant conditioning. These results evince that IsoAc can attain multiple and different cognitive roles in the modulation of the escape response of triatomines and show how cognitive processes can modulate a key behavior for surviving, as it is the escaping response in presence of a potential danger in insects.

  9. Multiple model mimicry and feeding behavior of the spider web-inhabiting damsel bug, Arachnocoris berytoides Uhler (Hemiptera: Nabidae), from Puerto Rico

    Science.gov (United States)

    Javier E. Mercado; Jorge A. Santiago-Blay

    2015-01-01

    The Neotropical genus, Arachnocoris Scott groups thirteen species of specialized spider web-inhabiting damsel bugs (Nabidae) distributed from Panama to Brazil and the West Indies. We present new information on the web behavior of A. berytoides Uhler from Puerto Rico. Three different life stages were observed on the spider webs, suggesting this species likely depends on...

  10. Hiring a Pest Management Professional for Bed Bugs

    Science.gov (United States)

    If you hire someone to treat your bed bug infestation, make sure they use Integrated Pest Management (IPM) techniques, check credentials, and know they may need multiple visits, to take apart furniture, and to use vacuums, heat, and pesticides.

  11. Accuracy of Trained Canines for Detecting Bed Bugs (Hemiptera: Cimicidae).

    Science.gov (United States)

    Cooper, Richard; Wang, Changlu; Singh, Narinderpal

    2014-12-01

    Detection of low-level bed bug, Cimex lectularius L. (Hemiptera: Cimicidae), infestations is essential for early intervention, confirming eradication of infestations, and reducing the spread of bed bugs. Despite the importance of detection, few effective tools and methods exist for detecting low numbers of bed bugs. Scent dogs were developed as a tool for detecting bed bugs in recent years. However, there are no data demonstrating the reliability of trained canines under natural field conditions. We evaluated the accuracy of 11 canine detection teams in naturally infested apartments. All handlers believed their dogs could detect infestations at a very high rate (≥95%). In three separate experiments, the mean (min, max) detection rate was 44 (10-100)% and mean false-positive rate was 15 (0-57)%. The false-positive rate was positively correlated with the detection rate. The probability of a bed bug infestation being detected by trained canines was not associated with the level of bed bug infestations. Four canine detection teams evaluated on multiple days were inconsistent in their ability to detect bed bugs and exhibited significant variance in accuracy of detection between inspections on different days. There was no significant relationship between the team's experience or certification status of teams and the detection rates. These data suggest that more research is needed to understand factors affecting the accuracy of canine teams for bed bug detection in naturally infested apartments. © 2014 Entomological Society of America.

  12. Tutoring Executives Online

    DEFF Research Database (Denmark)

    Bignoux, Stephane; Sund, Kristian J.

    2016-01-01

    Studies of learning and student satisfaction in the context of online university programs have largely neglected programs catering specifically to business executives. Such executives have typically been away from higher education for a number of years, and have collected substantial practical...... that in addition to some of the tutor behaviors already discussed in the literature, executive students look specifically for practical industry knowledge and experience in tutors, when judging how effective a tutor is. This has implications for both the recruitment and training of online executive MBA tutors....

  13. Bed Bugs FAQs

    Science.gov (United States)

    ... Bed bugs have been found in five-star hotels and resorts and their presence is not determined ... sleep. These areas include apartments, shelters, rooming houses, hotels, cruise ships, buses, trains, and dorm rooms. They ...

  14. Bed Bug Information Clearinghouse

    Science.gov (United States)

    Its purpose is to help states, communities, and consumers in efforts to prevent and control bed bug infestations. Currently includes only reviewed material from federal/state/local government agencies, extension services, and universities.

  15. Bed Bug Tips

    Science.gov (United States)

    How to deal with bed bugs in one printable page. Ten tips include ensuring correct insect identification, reducing clutter, understand integrated pest management, using mattress and box spring encasements, and heat treatment.

  16. Bed Bugs and Schools

    Science.gov (United States)

    Bed bugs have long been a pest – feeding on blood, causing itchy bites and generally irritating their human hosts. They are successful hitchhikers, and can move from an infested site to furniture, bedding, baggage, boxes, and clothing.

  17. Tooth Tutoring: The Findings.

    Science.gov (United States)

    Cone, Richard; And Others

    Findings are reported on a three year cross-age tutoring program in which undergraduate dental hygiene students and college students from other disciplines trained upper elementary students to tutor younger students in the techniques of dental hygiene. Data includes pre-post scores on the Oral Hygiene Index of plaque for both experimental and…

  18. Affect in Tutoring Dialogues

    NARCIS (Netherlands)

    Heylen, Dirk K.J.; Nijholt, Antinus; op den Akker, Hendrikus J.A.

    2005-01-01

    This paper is about INES, an intelligent, multimodal tutoring environment, and how we build a tutor agent in the environment that tries to be sensitive to the mental state of the student that interacts with it. The environment was primarily designed to help students practice nursing tasks. For

  19. Intelligent Tutoring Systems.

    Science.gov (United States)

    Anderson, John R.; And Others

    1985-01-01

    Cognitive psychology, artificial intelligence, and computer technology have advanced so much that it is feasible to build computer systems that are as effective as intelligent human tutors. Computer tutors have been developed for teaching students to do proofs in geometry and to write computer programs in the LISP language. (JN)

  20. Computer Tutors Get Personal

    Science.gov (United States)

    Johnson, David L.

    2005-01-01

    After decades of research in artificial intelligence (AI) and cognitive psychology, a number of companies have emerged that offer intelligent tutor system (ITS) soft ware to schools. These systems try to mimic the help that a human tutor would provide to an individual student, something nearly impossible for teachers to accomplish in the…

  1. Computer assisted tutoring in radiology

    Energy Technology Data Exchange (ETDEWEB)

    Jeffery, N

    1997-02-01

    The computer-based tutoring of visual concepts such as radiological images is a largely unexplored area. A review of the literature highlights limited use of computers as a means of radiological education, with the majority of systems being little more than hypermedia prototypes, on-line teaching files, and passive CD-Roms. Very few of the systems discussed in the research literature draw on the work from cognitive science and educational psychology for tutoring visual concepts. This thesis details and evaluates a method for indexing and retrieving images from large image databases via a cognitively informed graphical representation of visual concepts. This representation is derived using Multiple Correspondence Analysis from a statistical analysis of features present in the images. It is intended that this representation be used to assist in the computer based teaching of any discipline that requires the tutoring of visual concepts. The domain used as a test bed for this research is Magnetic Resonance Imaging in neuroradiology. Tutoring the interpretation of MR scans of the head represents a real practical problem due to the inherent complexity of the brain and variations in tissue contrast within image sequence and disease/pathology. The literature of concept categorisation and representation is critically reviewed to inform the design of a graphical representation of a concept (a pathology in the application domain). A specification for the design of an explicit representation of visual concepts is drawn from this literature review, together with methods of tutoring based around this model. A methodology for producing this representation is described, and implemented in the development of an overview plot for the concept of a disease of the brain, with associated statistical measures derived and operationalised for typicality and similarity of cases within a disease. These measures are precursors to the development of computer based tutoring strategies for image

  2. Tutoring Executives Online

    DEFF Research Database (Denmark)

    Bignoux, Stephane; Sund, Kristian J.

    2016-01-01

    Studies of learning and student satisfaction in the context of online university programs have largely neglected programs catering specifically to business executives. Such executives have typically been away from higher education for a number of years, and have collected substantial practical...... experience in the subject matters they are taught. Their expectations in terms of both content and delivery may therefore be different from non-executive students. We explore perceptions of the quality of tutoring in the context of an online executive MBA program through participant interviews. We find...... that in addition to some of the tutor behaviors already discussed in the literature, executive students look specifically for practical industry knowledge and experience in tutors, when judging how effective a tutor is. This has implications for both the recruitment and training of online executive MBA tutors....

  3. Bed bug deterrence

    Directory of Open Access Journals (Sweden)

    Haynes Kenneth F

    2010-09-01

    Full Text Available Abstract A recent study in BMC Biology has determined that the immature stage of the bed bug (the nymph signals its reproductive status to adult males using pheromones and thus avoids the trauma associated with copulation in this species. The success of this nymphal strategy of deterrence is instructive. Against the background of increasing problems with bed bugs, this research raises the question whether pheromones might be used to control them. See research article http://www.biomedcentral.com/1741-7007/8/121

  4. Intelligent tutoring systems

    Energy Technology Data Exchange (ETDEWEB)

    Anderson, J.R.; Boyle, C.F.; Reiser, B.J.

    1985-04-26

    Cognitive psychology, artificial intelligence, and computer technology have advanced to the point where it is feasible to build computer systems that are as effective as intelligent human tutors. Computer tutors based on a set of pedagogical principles derived from the ACT theory of cognition have been developed for teaching students to do proofs in geometry and to write computer programs in the language LISP. 19 references, 2 figures.

  5. Insects: Bugged Out!

    Science.gov (United States)

    Piehl, Kathy

    2011-01-01

    Insects really need no introduction. They have lived on earth much longer than humans and vastly outnumber people and all other animal species combined. People encounter them daily in their houses and yards. Yet, when children want to investigate insects, books can help them start their explorations. "Paleo Bugs" carries readers back to the time…

  6. Bed Bug Myths

    Science.gov (United States)

    Learn the truth about bed bugs, such as how easy they are to see with the naked eye, their preferred habitat, whether they transmit diseases, their public health effects, and whether pesticides are the best way to deal with an infestation.

  7. Learning through Tutoring: Low-Achieving Children as Tutors.

    Science.gov (United States)

    Feldman, Robert S.; Allen, Vernon L.

    Recent evidence suggests that the use of children acting as tutors for their peers may prove beneficial to the tutor as well as to the tutee. There is now abundant, unsubstantiated anecdotal evidence, and some controlled experimental work, which suggests that the tutor benefits greatly from his involvement in teaching. The enactment of the role of…

  8. My Science Tutor: A Conversational Multimedia Virtual Tutor

    Science.gov (United States)

    Ward, Wayne; Cole, Ron; Bolaños, Daniel; Buchenroth-Martin, Cindy; Svirsky, Edward; Weston, Tim

    2013-01-01

    My Science Tutor (MyST) is an intelligent tutoring system designed to improve science learning by elementary school students through conversational dialogs with a virtual science tutor in an interactive multimedia environment. Marni, a lifelike 3-D character, engages individual students in spoken dialogs following classroom investigations using…

  9. Nonverbal Behavior in Tutoring Interactions.

    Science.gov (United States)

    Feldman, Robert S.

    This document reports on a series of studies carried out concerning nonverbal behavior in peer tutoring interactions. The first study examined the encoding (enactment) of nonverbal behavior in a tutoring situation. Results clearly indicated that the tutor's nonverbal behavior was affected by the performance of the tutee. The question of whether or…

  10. THE HOMEWORK HELPER TUTOR MANUAL.

    Science.gov (United States)

    DEERING, ALBERT R.

    THIS MANUAL FOR TUTORS IN THE MOBILIZATION FOR YOUTH-NEW YORK CITY BOARD OF EDUCATION HOMEWORK HELPER PROGRAM IS DESIGNED TO SUPPLEMENT THE TRAINING AND SUPERVISION THAT THE TUTORS RECEIVE FROM THE MASTER TEACHERS. THE PROGRAM EMPLOYS HIGH SCHOOL STUDENTS AS TUTORS FOR OTHER STUDENTS AT ALL GRADE LEVELS--ELEMENTARY, JUNIOR HIGH, AND HIGH SCHOOL.…

  11. Good teacher, good tutor

    Directory of Open Access Journals (Sweden)

    Couto LB

    2016-07-01

    Full Text Available Lucélio B Couto, Gustavo S Romão, Reinaldo B Bestetti  Department of Medicine, University of Ribeirão Preto, Ribeirão Preto, Brazil We have read with great interest the paper by Kassab et al, who have essentially shown that good teachers will be good tutors in a problem-based learning (PBL environment. We have been facing great difficulties to select tutors because there has been no tradition in PBL in our region in the preuniversity teaching. Furthermore, the majority of our teachers have been formed in a discipline-based medical curriculum. Therefore, it is reassuring to learn from the work by Kassab et al that subject-matter mastery is the powerful independent predictor of tutoring skills.  View the original paper by Kassab and colleagues.

  12. Tutoring Strategies: A Case Study Comparing Learning Center Tutors and Academic Department Tutors

    Science.gov (United States)

    Bailey, Geoffrey K.

    2010-01-01

    Peer tutoring at the postsecondary level has been studied extensively, particularly over the last twenty years. Peer tutoring programs are common across institutional type and size in the United States (Boylan, Bonham, Bliss, & Saxon, 1995; Maxwell, 2001) given students' preferences for tutors who share age and status similarity (Cohen, 1986;…

  13. Bug City: Ladybugs & Fireflies [Videotape].

    Science.gov (United States)

    1998

    "Bug City" is a video series created to help children (grades 1-6) learn about insects and other small critters. All aspects of bug life are touched upon, including body structure, food, habitat, life cycle, mating habits, camouflage, mutualism (symbiosis), adaptations, social behavior, and more. Each program features dramatic…

  14. Bug City: Flies & Mosquitoes [Videotape].

    Science.gov (United States)

    1998

    "Bug City" is a video series created to help children (grades 1-6) learn about insects and other small critters. All aspects of bug life are touched upon, including body structure, food, habitat, life cycle, mating habits, camouflage, mutualism (symbiosis), adaptations, social behavior, and more. Each program features dramatic microscopic…

  15. Bug City: Ladybugs & Fireflies [Videotape].

    Science.gov (United States)

    1998

    "Bug City" is a video series created to help children (grades 1-6) learn about insects and other small critters. All aspects of bug life are touched upon, including body structure, food, habitat, life cycle, mating habits, camouflage, mutualism (symbiosis), adaptations, social behavior, and more. Each program features dramatic…

  16. Effectiveness of Bed Bug Pesticides

    Science.gov (United States)

    Before EPA allows a bed bug claim on a label, the product must be supported by data showing it will kill bed bugs when applied according to the label. Also consider factors such as extent of infestation, site preparation, and insect life stages.

  17. Bed Bug Laws and Regulations

    Science.gov (United States)

    21 states have some level of regulation with regard to bed bugs. Most of these requirements focus on hotels and landlords or other property managers. The Department of Housing and Urban Development has guidance on controlling bed bugs in public housing.

  18. Using Single Sensillum Recording to Detect Olfactory Neuron Responses of Bed Bugs to Semiochemicals.

    Science.gov (United States)

    Liu, Feng; Liu, Nannan

    2016-01-18

    The insect olfactory system plays an important role in detecting semiochemicals in the environment. In particular, the antennal sensilla which house single or multiple neurons inside, are considered to make the major contribution in responding to the chemical stimuli. By directly recording action potential in the olfactory sensillum after exposure to stimuli, single sensillum recording (SSR) technique provides a powerful approach for investigating the neural responses of insects to chemical stimuli. For the bed bug, which is a notorious human parasite, multiple types of olfactory sensillum have been characterized. In this study, we demonstrated neural responses of bed bug olfactory sensilla to two chemical stimuli and the dose-dependent responses to one of them using the SSR method. This approach enables researchers to conduct early screening for individual chemical stimuli on the bed bug olfactory sensilla, which would provide valuable information for the development of new bed bug attractants or repellents and benefits the bed bug control efforts.

  19. Studies in Tutoring.

    Science.gov (United States)

    Cloward, Robert D.

    This is the report of a demonstration tutorial project which was conducted in New York City as part of the Mobilization for Youth program. Eleven tutorial centers were established in neighborhood elementary schools, and 240 students from local academic and vocational high schools were hired to tutor 544 fourth- and fifth-grade pupils. Each center…

  20. A New Paradigm for Intelligent Tutoring Systems: Example-Tracing Tutors

    Science.gov (United States)

    Aleven, Vincent; McLaren, Bruce M.; Sewall, Jonathan; Koedinger, Kenneth R.

    2009-01-01

    The Cognitive Tutor Authoring Tools (CTAT) support creation of a novel type of tutors called example-tracing tutors. Unlike other types of ITSs (e.g., model-tracing tutors, constraint-based tutors), example-tracing tutors evaluate student behavior by flexibly comparing it against generalized examples of problem-solving behavior. Example-tracing…

  1. Bug bites and stings: When to see a dermatologist

    Medline Plus

    Full Text Available ... Tips to prevent and treat bug bites Although most bug bites are harmless, some can spread dangerous ... one’s greatest efforts, bug bites still happen. Fortunately, most bug bites and stings can be safely treated ...

  2. Chemoreception to aggregation pheromones in the common bed bug, Cimex lectularius.

    Science.gov (United States)

    Liu, Feng; Xiong, Caixing; Liu, Nannan

    2017-03-01

    The common bed bug, Cimex lectularius, is an obligate blood-feeding insect that is resurgent worldwide, posing a threat to human beings through its biting nuisance and disease transmission. Bed bug aggregation pheromone is considered a very promising attractant for use in the monitoring and management of bed bugs, but as yet little is known regarding the sensory physiology of bed bugs related to this pheromone. This study examined how the individual components of aggregation pheromone are perceived by the olfactory receptor neurons (ORNs) housed in different types of olfactory sensilla in bed bugs and the molecular basis for the ORNs' responses to the aggregation pheromone. We found that the ORNs in the D olfactory sensilla played a predominant role in detecting all the components of aggregation pheromone except for histamine, which was only recognized by the C sensilla. Bed bugs' E sensilla, which include four functionally distinct groups, showed only a very weak but variant sensitivity (both excitatory and inhibitory) to the components of aggregation pheromone. Functional tests of 15 odorant receptors (ORs) in response to the components of aggregation pheromone revealed that most of these components were encoded by multiple ORs with various tuning properties. This study provides a comprehensive understanding of how bed bug aggregation pheromone is perceived and recognized in the peripheral olfactory system and will contribute useful information to support the development of synthetic attractants for bed bug monitoring and control.

  3. A SAS Interface for Bayesian Analysis with WinBUGS

    Science.gov (United States)

    Zhang, Zhiyong; McArdle, John J.; Wang, Lijuan; Hamagami, Fumiaki

    2008-01-01

    Bayesian methods are becoming very popular despite some practical difficulties in implementation. To assist in the practical application of Bayesian methods, we show how to implement Bayesian analysis with WinBUGS as part of a standard set of SAS routines. This implementation procedure is first illustrated by fitting a multiple regression model…

  4. The BUG BITBUS Universal Gateway

    Energy Technology Data Exchange (ETDEWEB)

    Nawrocki, G.

    1996-02-01

    The BITBUS Universal Gateway (BUG) provides a unique, cost effective solution to many different computer interface problems. Each BUG node, utilizing ``on board`` intelligence, has the ability to provide a communication link between BITBUS protocol and other computer-signal interfaces. Among them, IEEE-488, RS232, and raw analog and binary signal 1/0. BITBUS is a multidrop, multinode link with the ability to communicate over great distances. By using this method of signal transfer, along with the communication conversion ability of the BUG, one could accomplish such things as the ability to run IEEE-488 instruments over great distances, extend a multidrop links to RS232 instruments, and provide a convenient interface point for remote analog and binary 1/0 signals, all on one homogeneous network. The BUG not only provides this through the wired ``twisted pair`` standard of BITBUS, but extends the ability to fiber optic communications for signal transfer over extreme distances and through electrically ``noisy`` environments.

  5. Bed Bugs: The Australian Response

    Science.gov (United States)

    Doggett, Stephen L.; Orton, Christopher J.; Lilly, David G.; Russell, Richard C.

    2011-01-01

    Australia has experienced a sudden and unexpected resurgence in bed bug infestations from both Cimex lectularius L. and Cimex hemipterus F. A survey in 2006 revealed that infestations had increased across the nation by an average of 4,500% since the start of the decade. In response, a multi-disciplinary approach to combat the rise of this public health pest was implemented and involved the coordinated efforts of several organizations. The key components of the strategy included the introduction of a pest management standard ‘A Code of Practice for the Control of Bed Bug Infestations in Australia’ that defines and promotes ‘best practice’ in bed bug eradication, the development of a policy and procedural guide for accommodation providers, education of stakeholders in best management practices, and research. These strategies continue to evolve with developments that lead to improvements in ‘best practice’ while bed bugs remain problematic in Australia. PMID:26467616

  6. Traveler's Health: Avoid Bug Bites

    Science.gov (United States)

    ... Blood Clots Bug Bites Business Travel Cold Climates Counterfeit Drugs Cruise Ship Travel Families with Children Fish ... insect repellents that contain at least 20% DEET (products include Cutter Backwoods and Off! Deep Woods) for ...

  7. Bed Bugs: The Australian Response

    Directory of Open Access Journals (Sweden)

    Richard C. Russell

    2011-04-01

    Full Text Available Australia has experienced a sudden and unexpected resurgence in bed bug infestations from both Cimex lectularius L. and Cimex hemipterus F. A survey in 2006 revealed that infestations had increased across the nation by an average of 4,500% since the start of the decade. In response, a multi-disciplinary approach to combat the rise of this public health pest was implemented and involved the coordinated efforts of several organizations. The key components of the strategy included the introduction of a pest management standard ‘A Code of Practice for the Control of Bed Bug Infestations in Australia’ that defines and promotes ‘best practice’ in bed bug eradication, the development of a policy and procedural guide for accommodation providers, education of stakeholders in best management practices, and research. These strategies continue to evolve with developments that lead to improvements in ‘best practice’ while bed bugs remain problematic in Australia.

  8. Bed Bugs: The Australian Response.

    Science.gov (United States)

    Doggett, Stephen L; Orton, Christopher J; Lilly, David G; Russell, Richard C

    2011-04-15

    Australia has experienced a sudden and unexpected resurgence in bed bug infestations from both Cimex lectularius L. and Cimex hemipterus F. A survey in 2006 revealed that infestations had increased across the nation by an average of 4,500% since the start of the decade. In response, a multi-disciplinary approach to combat the rise of this public health pest was implemented and involved the coordinated efforts of several organizations. The key components of the strategy included the introduction of a pest management standard 'A Code of Practice for the Control of Bed Bug Infestations in Australia' that defines and promotes 'best practice' in bed bug eradication, the development of a policy and procedural guide for accommodation providers, education of stakeholders in best management practices, and research. These strategies continue to evolve with developments that lead to improvements in 'best practice' while bed bugs remain problematic in Australia.

  9. Print a Bed Bug Card

    Science.gov (United States)

    Two sets of business card-sized lists of tips for prevention of bed bug infestations, one for general use around home, the other for travelers. Print a single card or a page of cards for distribution.

  10. 42 Variability Bugs in the Linux Kernel

    DEFF Research Database (Denmark)

    Abal, Iago; Brabrand, Claus; Wasowski, Andrzej

    2014-01-01

    Feature-sensitive verification pursues effective analysis of the exponentially many variants of a program family. However, researchers lack examples of concrete bugs induced by variability, occurring in real large-scale systems. Such a collection of bugs is a requirement for goal-oriented research......, serving to evaluate tool implementations of feature-sensitive analyses by testing them on real bugs. We present a qualitative study of 42 variability bugs collected from bug-fixing commits to the Linux kernel repository. We analyze each of the bugs, and record the results in a database. In addition, we...

  11. 40 Variability Bugs in the Linux Kernel

    DEFF Research Database (Denmark)

    Abal Rivas, Iago; Brabrand, Claus; Wasowski, Andrzej

    2014-01-01

    is a requirement for goal-oriented research, serving to evaluate tool implementations of feature-sensitive analyses by testing them on real bugs. We present a qualitative study of 40 variability bugs collected from bug-fixing commits to the Linux kernel repository. We investigate each of the 40 bugs, recording......Feature-sensitive verification is a recent field that pursues the effective analysis of the exponential number of variants of a program family. Today researchers lack examples of concrete bugs induced by variability, and occurring in real large-scale software. Such a collection of bugs...

  12. Fixing Two BSD TCP Bugs

    Science.gov (United States)

    Allman, Mark

    1997-01-01

    This note outlines two bugs found in the BSD 4.4 Lite TCP implementation, as well as the implications of these bugs and possible ways to correct them. The first problem encountered in this particular TCP implementation is the use of a 2 segment initial congestion window, rather than the standard 1 segment initial window. The second problem is that the receiver delays ACKs in violation of the delayed ACK rules,

  13. Bed bugs in healthcare settings.

    Science.gov (United States)

    Munoz-Price, L Silvia; Safdar, Nasia; Beier, John C; Doggett, Stephen L

    2012-11-01

    Infestations caused by bed bugs have resurfaced during the past decade across all continents. Even though bed bugs primarily cause skin manifestations in humans, a major stigma is placed upon people or institutions found to carry them. It is important for healthcare facilities to be prepared for this pest by implementing policies, carefully selecting materials used for hospital furniture, and educating providers on early identification and control.

  14. Tips for Reading Tutors = Consejos para los Tutores en Lectura.

    Science.gov (United States)

    Department of Education, Washington, DC.

    Reading is the basis for learning and school success. While reading is learned primarily in the classroom, many students need extra time and help. Research shows that tutoring is a great way for individuals and groups outside school to support learning, but effective tutoring requires appropriate training and careful planning. This brochure,…

  15. Situated Learning, Reflective Practice and Conceptual Expansion: Effective Peer Observation for Tutor Development

    Science.gov (United States)

    Bell, Amani; Mladenovic, Rosina

    2015-01-01

    Despite tutors' importance, they often encounter inadequate professional development and support. This study describes the impact of peer observation of teaching activities on tutors' professional development using multiple data-sets over a three-year period. The data was analysed according to three themes: situated learning, reflective…

  16. Situated Learning, Reflective Practice and Conceptual Expansion: Effective Peer Observation for Tutor Development

    Science.gov (United States)

    Bell, Amani; Mladenovic, Rosina

    2015-01-01

    Despite tutors' importance, they often encounter inadequate professional development and support. This study describes the impact of peer observation of teaching activities on tutors' professional development using multiple data-sets over a three-year period. The data was analysed according to three themes: situated learning, reflective practice…

  17. Sapindaceae, cyanolipids, and bugs.

    Science.gov (United States)

    Aldrich, J R; Carroll, S P; Lusby, W R; Thompson, M J; Kochansky, J P; Waters, R M

    1990-01-01

    Scentless plant bugs (Heteroptera: Rhopalidae) are so named because adults of the Serinethinae have vestigial metathoracic scent glands. Serinethines are seed predators of Sapindales, especially Sapindaceae that produce toxic cyanolipids. In two serinethine species whose ranges extend into the southern United States,Jadera haematoloma andJ. sanguinolenta, sequestration of host cyanolipids as glucosides renders these gregarious, aposematic insects unpalatable to a variety of predators. The blood glucoside profile and cyanogenesis ofJadera varies depending on the cyanolipid chemistry of hosts, and adults and larvae fed golden rain tree seeds (Koelreuteria paniculata) excrete the volatile lactone, 4-methyl-2(5H)-furanone, to which they are attracted.Jadera fed balloon vine seeds (Cardiospermum spp.) do not excrete the attractive lactone. Loss of the usual heteropteran defensive glands in serinethines may have coevolved with host specificity on toxic plants, and the orientation ofJadera to a volatile excretory product could be an adaptive response to save time.

  18. Stupid Tutoring Systems, Intelligent Humans

    Science.gov (United States)

    Baker, Ryan S.

    2016-01-01

    The initial vision for intelligent tutoring systems involved powerful, multi-faceted systems that would leverage rich models of students and pedagogies to create complex learning interactions. But the intelligent tutoring systems used at scale today are much simpler. In this article, I present hypotheses on the factors underlying this development,…

  19. The Effects of ExcelTutor Software Desing an Intelligent Tutoring Sysytem on Learning

    Directory of Open Access Journals (Sweden)

    Sinan KAYA

    2007-12-01

    Full Text Available The purpose of this study is to examine the effects of ExcelTUTOR drill software on achievement of students, which was design as computer based intelligent tutoring system, developed by the researcher. In this study, pretest- post test with control group, which is one of the experimental research designs, was used. The experimental and control groups of the study were composed of 20 students for each group, totally 40 students who went to Gazi University, Kırşehir Faculty of Education, Social Sciences Teaching Program in 2004-2005 term and they attended “Using Computer in Social Sciences” selective course. Experimental and control group students were chosen randomly. To collect the data, two tests were developed by the researcher. One of the tests was named pre-test and the other was called as post-test. Both of which included 25 multiple choice questions. While testing the hypotheses, one way variance analysis and covariance were used. The analysis was done at 0.05 significance level. As a result, ExcelTUTOR drill software design as computer based intelligent tutoring system was found contributing to learning.

  20. Peer and Cross-Age Tutoring. ERIC Digest, Number 79.

    Science.gov (United States)

    Gaustad, Joan

    One-to-one tutoring programs, such as peer and cross-age tutoring, can result in emotional and learning benefits for the tutor and the tutee. Peer tutoring involves two students of the same age. In cross-age tutoring, the tutor is older than the tutee. The Willamette High School Peer Tutoring Program in Eugene, Oregon; the Coca-Cola Valued Youth…

  1. Perceptions of Tutoring Roles and Psychological Distance among Instructors, Tutors and Students at a Korean University

    Science.gov (United States)

    Lee, Hye-Jung; Hong, Youngil; Choi, Hyoseon

    2017-01-01

    This study explores issues related to the tutor's role when initiating tutoring as an institutional strategy at a conventional university. Based on a pilot tutoring program implemented in four college courses, we investigated the perceptions of instructors, tutors and students regarding the role of tutoring and whether it affected the…

  2. Coaching Tutors: An Instrumental Case Study on Testing an Integrated Framework for Tutoring Sessions

    Science.gov (United States)

    Holland, Alicia L.; Grant, Chris; Donthamsetty, Reshema

    2017-01-01

    The objective for the current qualitative case study was to examine participants' perceptions on the tutor coaching and session review frameworks. The location of the study was at the tutor coaches' place of business. At the beginning of the study, tutor coaches were trained on how to implement the tutoring coaching framework with their tutors,…

  3. Perceptions of Tutoring Roles and Psychological Distance among Instructors, Tutors and Students at a Korean University

    Science.gov (United States)

    Lee, Hye-Jung; Hong, Youngil; Choi, Hyoseon

    2017-01-01

    This study explores issues related to the tutor's role when initiating tutoring as an institutional strategy at a conventional university. Based on a pilot tutoring program implemented in four college courses, we investigated the perceptions of instructors, tutors and students regarding the role of tutoring and whether it affected the…

  4. Find a Bed Bug Pesticide Product

    Science.gov (United States)

    Introduces the Bed Bug Product Search Tool, to help consumers find EPA-registered pesticides for bed bug infestation control. Inclusion in this database is not an endorsement. Always follow label directions carefully.

  5. Bed Bug Guidance for School Nurses

    Science.gov (United States)

    School nurses are often called upon to provide vital information to students, parents, teachers, and administrators. These tips on identifying, managing and preventing bed bugs will help you to effectively respond if bed bugs appear in your school.

  6. Videos, Webinars, Blogs Related to Bed Bugs

    Science.gov (United States)

    These tools provide practical insight on issues such as integrated pest management (IPM) for schools, bed bug bites, how carpet beetles can help, bed bugs as hitchhikers, and preventing and controlling infestations.

  7. Peer Tutoring: An Economical Instructional Model.

    Science.gov (United States)

    Lundell, Kerth T.; Brown, William E.

    1979-01-01

    A peer tutoring model is described and suggestions for implementing peer tutoring programs are provided. The seven steps in the development of a peer tutoring program are: establishing a need, considering curriculum, assessing, selecting learners, selecting tutors, monitoring, and coordinating. (PHR)

  8. Pedagogical Strategies for Human and Computer Tutoring.

    Science.gov (United States)

    Reiser, Brian J.

    The pedagogical strategies of human tutors in problem solving domains are described and the possibility of incorporating these techniques into computerized tutors is examined. GIL (Graphical Instruction in LISP), an intelligent tutoring system for LISP programming, is compared to human tutors teaching the same material in order to identify how the…

  9. Tutoring Social Sciences learning

    Directory of Open Access Journals (Sweden)

    Sara Prades Plaza

    2016-03-01

    With this experience teaching innovation we have sought to improve our academic methodology, giving a strong weight to the tutoring, both onsite and virtual. We also have tried to encourage teamwork in groups and independent learning. Thanks to these improvements, we have continuously evaluated the students, while students self evaluate their learning process. In summary, the proposal of educational innovation that we have carried out has shown the need to promote a system of mentoring to advise, guide and support students in their learning process.

  10. Sign Language Tutoring Tool

    CERN Document Server

    Aran, Oya; Benoit, Alexandre; Carrillo, Ana Huerta; Fanard, François-Xavier; Campr, Pavel; Akarun, Lale; Caplier, Alice; Rombaut, Michele; Sankur, Bulent

    2008-01-01

    In this project, we have developed a sign language tutor that lets users learn isolated signs by watching recorded videos and by trying the same signs. The system records the user's video and analyses it. If the sign is recognized, both verbal and animated feedback is given to the user. The system is able to recognize complex signs that involve both hand gestures and head movements and expressions. Our performance tests yield a 99% recognition rate on signs involving only manual gestures and 85% recognition rate on signs that involve both manual and non manual components, such as head movement and facial expressions.

  11. Bed Bug Education for School Maintenance

    Science.gov (United States)

    Henriksen, Missy

    2012-01-01

    Bed bugs are a growing problem, not only in homes and hotels, but also in schools and colleges. Facility administrators and staff need to understand the bed bug resurgence and develop best practices to deal with an infestation. In this article, the author offers tips for preventing and treating bed bugs in school and university settings.

  12. Bed Bug Education for School Maintenance

    Science.gov (United States)

    Henriksen, Missy

    2012-01-01

    Bed bugs are a growing problem, not only in homes and hotels, but also in schools and colleges. Facility administrators and staff need to understand the bed bug resurgence and develop best practices to deal with an infestation. In this article, the author offers tips for preventing and treating bed bugs in school and university settings.

  13. Experiencing the role of PBL tutor.

    Science.gov (United States)

    Lyberg-Åhlander, Viveka; Lundskog, Margareta; Hansson, Kristina

    2014-01-01

    The tutor is important for student learning in the PBL group. The students expect the tutor to monitor and steer the group process and to support the learning process, helping students to become aware of their own learning. This study aimed at investigating the PBL tutor's role. Five PBL tutors at the Speech/Language Pathology program were interviewed regarding their view of the tutors' role and what support they need. The analysis of the transcribed interviews focused on finding patterns and variation regarding tutor-activity at different stages in the PBL work and in their views of their progress as tutors. The results indicate that being a tutor is a balancing act and that the tutor need continuous support and input from different sources. Tutors should be encouraged to reflect on their own reactions and interventions and to be explicit and confident in their thoughts about PBL.

  14. Success in tutoring electronic troubleshooting

    Science.gov (United States)

    Parker, Ellen M.

    1990-01-01

    Two years ago Dr. Sherrie Gott of the Air Force Human Resources Laboratory described an avionics troubleshooting tutor being developed under the Basic Job Skills Research Program. The tutor, known as Sherlock, is directed at teaching the diagnostic procedures necessary to investigate complex test equipment used to maintain F-15 fighter aircraft. Since Dr. Gott's presentation in 1987, the tutor has undergone field testing at two Air Force F-15 flying wings. The results of the field test showed that after an average of 20 hours on the tutor, the 16 airmen in the experimental group (who average 28 months of experience) showed significant performance gains when compared to a control group (having a mean experience level of 37 months) who continued participating in the existing on-the-job training program. Troubleshooting performance of the tutored group approached the level of proficiency of highly experienced airmen (averaging approximately 114 months of experience), and these performance gains were confirmed in delayed testing six months following the intervention. The tutor is currently undergoing a hardware and software conversion form a Xerox Lisp environment to a PC-based environment using an object-oriented programming language. Summarized here are the results of the successful field test. The focus is on: (1) the instructional features that contributed to Sherlock's success; and (2) the implementation of these features in the PC-based version of the avionics troubleshooting tutor.

  15. Training Undergraduate Physics Peer Tutors

    Science.gov (United States)

    Nossal, S. M.; Jacob, A. T.

    2004-05-01

    The University of Wisconsin's Physics Peer Mentor Tutor Program matches upper level undergraduate physics students in small study groups with students studying introductory algebra-based physics. We work with students who are potentially at-risk for having academic trouble with the course. They include students with a low exam score, learning disabilities, no high school physics, weak math backgrounds, and/or on academic probation. We also work with students from groups under represented in the sciences and who may be feeling isolated or marginal on campus such as minority, returning adult, and international students. The tutors provide a supportive learning environment, extra practice problems, and an overview of key concepts. In so doing, they help our students to build confidence and problem solving skills applicable to physics and other areas of their academic careers. The Physics Peer Mentor Tutor Program is modeled after a similar program for chemistry created by the University of Wisconsin's Chemistry Learning Center. Both programs are now run in collaboration. The tutors are chosen for their academic strength and excellent communication skills. Our tutors are majoring in physics, math, and secondary-level science education. The tutors receive ongoing training and supervision throughout the year. They attend weekly discipline-specific meetings to discuss strategies for teaching the content currently being discussed in the physics course. They also participate in a weekly teaching seminar with science tutors from chemistry and biochemistry to discuss teaching methods, mentoring, and general information relating to the students with whom we work. We will describe an overview of the Physics Peer Mentor Tutor Program with a focus on the teacher training program for our undergraduate tutors.

  16. Designing and Evaluating Tutoring Feedback Strategies for digital learning environments on the basis of the Interactive Tutoring Feedback Model

    Directory of Open Access Journals (Sweden)

    Susanne Narciss

    2013-06-01

    Full Text Available This paper describes the interactive tutoring feedback model (ITF-model; Narciss, 2006; 2008, and how it can be applied to the design and evaluation of feedback strategies for digital learning environments. The ITF-model conceptualizes formative tutoring feedback as a multidimensional instructional activity that aims at contributing to the regulation of a learning process in order to help learners acquire or improve the competencies needed to master learning tasks. It integrates findings from systems theory with recommendations of prior research on interactive instruction and elaborated feedback, on task analyses, on error analyses, and on tutoring techniques. Based on this multi-dimensional view of formative tutoring feedback methodological implications for designing and investigating multiple effects of feedback under multiple individual and situational conditions are described. Furthermore, the paper outlines how the implications of the ITF-model have been applied in several studies to the design and evaluation of tutoring feedback strategies for digital learning environments (e.g., Narciss, 2004; Narciss & Huth, 2006; Narciss, Schnaubert, Andres, Eichelmann, Goguadze, & Sosnovsky, 2013.

  17. The Influence of Roughness and Pyrethroid Formulations on Bed Bug (Cimex lectularius L.) Resting Preferences.

    Science.gov (United States)

    Hottel, Benjamin A; Pereira, Roberto M; Koehler, Philip G

    2015-05-12

    Two-choice tests were conducted to examine the effect of surface roughness on the resting preference of bed bugs, Cimex lectularius L., on copper, basswood, and acrylic materials. The influence of pyrethroid formulation applications on resting preferences was also evaluated. Bed bugs were given the choice of resting between two sanded halves of each material tested. One half was sanded with a P60 grit sandpaper and the other with a less rough P600 grit sandpaper. A significantly higher proportion of bed bugs chose to rest on the rougher P60 grit sanded half of all materials tested. Pyrethroid applications were made to either the P60 grit half or both halves of acrylic arenas and resting preferences were again assessed. Behavioral responses of bed bugs to pyrethroid formulation applications varied depending on the bed bug strain used and the formulation applied. Bed bugs would still rest on the P60 grit half when Suspend SC formulation (0.06% deltamethrin) was applied; however, an avoidance response was observed from a bed bug strain susceptible to D-Force aerosol formulations (0.06% deltamethrin). The avoidance behavior is likely attributed to one, more than one, or even an interaction of multiple spray constituents and not the active ingredient.

  18. The Influence of Roughness and Pyrethroid Formulations on Bed Bug (Cimex lectularius L. Resting Preferences

    Directory of Open Access Journals (Sweden)

    Benjamin A. Hottel

    2015-05-01

    Full Text Available Two-choice tests were conducted to examine the effect of surface roughness on the resting preference of bed bugs, Cimex lectularius L., on copper, basswood, and acrylic materials. The influence of pyrethroid formulation applications on resting preferences was also evaluated. Bed bugs were given the choice of resting between two sanded halves of each material tested. One half was sanded with a P60 grit sandpaper and the other with a less rough P600 grit sandpaper. A significantly higher proportion of bed bugs chose to rest on the rougher P60 grit sanded half of all materials tested. Pyrethroid applications were made to either the P60 grit half or both halves of acrylic arenas and resting preferences were again assessed. Behavioral responses of bed bugs to pyrethroid formulation applications varied depending on the bed bug strain used and the formulation applied. Bed bugs would still rest on the P60 grit half when Suspend SC formulation (0.06% deltamethrin was applied; however, an avoidance response was observed from a bed bug strain susceptible to D-Force aerosol formulations (0.06% deltamethrin. The avoidance behavior is likely attributed to one, more than one, or even an interaction of multiple spray constituents and not the active ingredient.

  19. Proposal of a system of function-discovery using a bug type of artificial life

    Energy Technology Data Exchange (ETDEWEB)

    Serikawa, S.; Shimomura, T. [Kyushu Institute of Technology, Kitakyushu (Japan)

    1998-02-01

    The effectiveness of artificial life is investigated from an engineering point of view. A system (named S-system) of function-discovery using a bug type of artificial life is proposed in this study. Some functions are extracted by the system. The chromosome of a bug consists of functions, constants and variables. A tree structure is used for the expression of the chromosome. Some observation data are provided for the bugs. After obtaining the data, they reproduce. The concept of sexual / asexual reproduction is introduced in this study. The number of homogeneous bugs is limited for a variety of species. These ideas are very effective for a function-search. A part of the chromosome changes by mutation. As the generation proceeds, the bugs with the function in agreement with the observation data survive selectively, and finally determine the true function. For the validity of this system, some data which obey the known laws have been given for the bugs. The bugs have evolved and discovered some functions in agreement with the laws. As for an unknown function, observation data on glossiness have been provided. They have also discovered the function. In addition, they have determined the multiple curves included in the image data. The S-system has the characteristics that the solution tends to converge and stabilizes in comparison with Genetic Programming. Moreover, the form of the function is relatively simple. 11 refs., 14 figs., 3 tabs.

  20. Zero bugs and program faster

    CERN Document Server

    Thompson, Kate

    2015-01-01

    A book about programming, improving skill, and avoiding mistakes. The author spent two years researching every bug avoidance technique she could find. This book contains the best of them. If you want to program faster, with fewer bugs, and write more secure code, buy this book! "This is the best book I have ever read." - Anonymous reviewer "Four score and seven years ago this book helped me debug my server code." -Abraham Lincoln "Would my Javascript have memory leaks without this book? Would fishes fly without water?" -Socrates "This book is the greatest victory since the Spanish Armada, and the best about programming." -Queen Elizabeth

  1. Four bugs on a rectangle

    KAUST Repository

    Chapman, S. J.

    2010-11-10

    The idealized mathematical problem of four bugs in cyclic pursuit starting from a 2-by-1 rectangle is considered, and asymptotic formulas are derived to describe the motion. In contrast to the famous case of four bugs on a square, here the trajectories quickly freeze to essentially one dimension. After the first rotation about the centre point, the scale of the configuration has shrunk by a factor of 10427907250, and this number is then exponentiated four more times with each successive cycle. Relations to Knuth\\'s double-arrow notation and level-index arithmetic are discussed. This journal is © 2011 The Royal Society.

  2. Cold tolerance of bed bugs and practical recommendations for control.

    Science.gov (United States)

    Olson, Joelle F; Eaton, Marc; Kells, Stephen A; Morin, Victor; Wang, Changlu

    2013-12-01

    Bed bugs were exposed to freezing temperatures for various exposure times to determine cold tolerance and mortality estimates for multiple life stages. The mean supercooling point for all bed bug life stages ranged from -21.3 degrees C to -30.3 degrees C, with the egg stage reporting the lowest value. A probit analysis provided a lower lethal temperature (LLT99) of -31.2 degrees C when estimates from all life stages were combined, demonstrating that all stages of bed bugs are not capable of surviving temperatures below body freezing and are therefore freeze intolerant. At conditions above the LLT99, bed bug mortality depended on temperature and exposure time at temperatures above LLT99. Based on our model estimates, survival was estimated for temperatures above -12 degrees C even after 1 wk of continuous exposure. However, exposure to temperatures below -13 degrees C will result in 100% mortality in d to ensure mortality of all life stages. Unfortunately, sublethal exposure to lower temperatures did not prevent subsequent feeding behavior in surviving stages. Practical recommendations for management of potentially infested items are discussed.

  3. Laboratory rearing of bed bugs

    Science.gov (United States)

    The resurgence of bed bugs Cimex lectularius L. in the United States and worldwide has resulted in an increase in research by university, government, and industry scientists directed at the biology and control of this blood-sucking pest. A need has subsequently arisen for producing sufficient biolog...

  4. The Great Bug Hunt 2011

    Science.gov (United States)

    Dixon-Watmough, Rebecca

    2011-01-01

    The Association For Science Education's "schoolscience.co.uk Great Bug Hunt 2011," in association with Martin Rapley and Gatekeeper Educational, has been a resounding success--not only because it fits into the science curriculum so neatly, but also because of the passion it evoked in the children who took part. This year's entries were…

  5. How to Find Bed Bugs

    Science.gov (United States)

    Find and correctly identify an infestation early before it becomes widespread. Look for rusty or reddish stains and pinpoint dark spots on bed sheets or mattresses, and search for bugs near the piping, seams and tags of the mattress and box spring.

  6. Bug bites and stings: When to see a dermatologist

    Medline Plus

    Full Text Available ... de12", ]; for (var c = 0; c Tips to prevent and treat bug bites Although most bug bites ... take steps to reduce your risk. To help prevent bug bites, dermatologists recommend the following tips: Use ...

  7. Bug bites and stings: When to see a dermatologist

    Medline Plus

    Full Text Available ... de12", ]; for (var c = 0; c Tips to prevent and treat bug bites Although most bug bites ... take steps to reduce your risk. To help prevent bug bites, dermatologists recommend the following tips: Use ...

  8. Bugging Forecast: Unknown, Disliked, Occasionally Intimate. Bed Bugs in Germany Meet Unprepared People: e51083

    National Research Council Canada - National Science Library

    Conrad Seidel; Klaus Reinhardt

    2013-01-01

    .... The reasons for this exaggerated fear are not fully understood. One hypothesis is that the folk knowledge on recognising and controlling bed bugs decreased as bed bugs became rarer in the 1960s and led to irrational perceptions...

  9. Expertise Amiss: Interactivity Fosters Learning but Expert Tutors Are Less Interactive than Novice Tutors

    Science.gov (United States)

    Herppich, Stephanie; Wittwer, Jörg; Nückles, Matthias; Renkl, Alexander

    2016-01-01

    The extent to which tutors are interactive and engage in dialogue with a student tends to depend on their pedagogical expertise. Normally, tutors with pedagogical expertise are more interactive than tutors without pedagogical expertise. This finding, however, has largely been obtained when examining tutoring in procedural domains such as…

  10. Suicide following an infestation of bed bugs.

    Science.gov (United States)

    Burrows, Stephanie; Perron, Stéphane; Susser, Stephanie

    2013-01-01

    Male, 62. Bipolar disorder. Bordeline personality disorder. - Bed bug infestation. Psychiatry. Unusual clinical course. In the past decade, bed bug infestations have been increasingly common in high income countries. Psychological consequences of these infestations are rarely examined in the scientific literature. We present a case, based on a coroner's investigation report, of a woman with previous psychiatric morbidity who jumped to her death following repeated bed bug infestations in her apartment. Our case report shows that the bed bug infestations were the likely trigger for the onset a negative psychological state that ultimately led to suicide. Given the recent surge in infestations, rapid action needs to be taken not only in an attempt to control and eradicate the bed bugs but also to adequately care for those infested by bed bugs.

  11. Joining the Conversation: Scaffolding and Tutoring Mathematics

    Science.gov (United States)

    Valkenburg, Jim

    2010-01-01

    Tutoring is one of those skills which require the ability to communicate an in-depth understanding of the subject. This article is about scaffolding while tutoring, and the tutoring talents described can be applied across the curriculum. Lev Vygotsky's ideas about communication and education play a key role in the development of scaffolding…

  12. Building a Computer Tutor: Design Issues.

    Science.gov (United States)

    Woolf, Beverly; McDonald, David D.

    1985-01-01

    Description of several computerized tutoring systems is organized around types of knowledge any tutor must possess--subject area, student's information, and how to teach and communicate. Data and control structures of Meno-tutor are described to illustrate use of artificial intelligence to model the student, a domain, and teaching strategies. (MBR)

  13. Investigating Language Tutor Social Inclusion Identities

    Science.gov (United States)

    Barkhuizen, Gary

    2017-01-01

    This article explores the identities of tutors working in one-to-one instructional arrangements, which entail a tutor and an adult English learner working together to meet the particular language learning needs and goals of the learner. The tutors in this study are matched with their partners through an organization in New Zealand which aims to…

  14. Multimedia Tutors for Science and Engineering.

    Science.gov (United States)

    Woolf, Beverly Park; Poli, Corrado; Grosse, Ian; Day, Roberta

    We have built several multimedia tutors for science and engineering education. This paper discusses Design for Manufacturing tutors and an electronic homework systems used by over 2000 students daily. The engineering tutors instruct students on efficient procedures for designing parts for manufacture. The goal is to support a deeper understanding…

  15. Investigating Language Tutor Social Inclusion Identities

    Science.gov (United States)

    Barkhuizen, Gary

    2017-01-01

    This article explores the identities of tutors working in one-to-one instructional arrangements, which entail a tutor and an adult English learner working together to meet the particular language learning needs and goals of the learner. The tutors in this study are matched with their partners through an organization in New Zealand which aims to…

  16. Instructional Aspects of Intelligent Tutoring Systems.

    Science.gov (United States)

    Pieters, Jules M., Ed.

    This collection contains three papers addressing the instructional aspects of intelligent tutoring systems (ITS): (1) "Some Experiences with Two Intelligent Tutoring Systems for Teaching Computer Programming: Proust and the LISP-Tutor" (van den Berg, Merrienboer, and Maaswinkel); (2) "Some Issues on the Construction of Cooperative…

  17. Teaching styles of tutors in a problem-based curriculum: students' and tutors' perception.

    Science.gov (United States)

    Kassab, Salah; Al-Shboul, Qasim; Abu-Hijleh, Marwan; Hamdy, Hossam

    2006-08-01

    This study compared the self-rated with student-rated teaching styles of PBL tutors. We also examined the relationship between teaching styles of tutors' and students' evaluation of tutor effectiveness in tutorials. The study included 48 tutors and 276 medical students. Tutors, and students' were given a teaching style inventory with a 5-point scale consisting of 21 items that comprise four domains of teaching styles (facilitative, collaborative, suggestive and assertive). In addition, quantitative and qualitative evaluations of tutor effectiveness by students were analyzed. Tutors perceived themselves in the facilitative-collaborative end of the spectrum of styles In contrast, students perceived tutors as less 'facilitative-collaborative' and more 'suggestive-assertive' than tutors self-ratings (p teaching styles. However, other tutor attributes such as establishing rapport with students, providing academic help for them and having content expertise were considered important criteria of an effective tutor. We conclude that there is a mismatch between students' and tutors' perceptions about teaching styles of tutor. Tutor attributes other than teaching styles are important determinants of an effective tutor.

  18. Bed bugs: they are back! The role of the school nurse in bed bug management.

    Science.gov (United States)

    Sciscione, Patricia

    2012-09-01

    Recently there has been a resurgence of bed bugs in all facets of our society. Bed bugs have even been found in schools, causing unnecessary exclusion of students and unfounded hysteria. School nurses are again called upon to be front-line sources of information to quell the hysteria and confusion related to this unsavory condition. By arming themselves with the best evidence regarding proper identification of bed bugs and their bites and information about integrated prevention measures to control transmission of infestations, school nurses can contribute to the control and management of bed bugs and aid in the overall battle against this "new and improved" invasion of the bed bugs.

  19. Bugging forecast: unknown, disliked, occasionally intimate. Bed bugs in Germany meet unprepared people.

    Science.gov (United States)

    Seidel, Conrad; Reinhardt, Klaus

    2013-01-01

    Bed bugs appear to be feared more than vector insects and other household pests. The reasons for this exaggerated fear are not fully understood. One hypothesis is that the folk knowledge on recognising and controlling bed bugs decreased as bed bugs became rarer in the 1960s and led to irrational perceptions. Here, we examine people's ability to recognise a bed bug and their response what to do in case of an infestation. We found that 13% of a sample of 391 people in four large German cities recognised a bed bug; 15% of all respondents would call a pest controller in case of bed bug infestation. This results in the pessimistic estimate that 97% of all early-stage infestations could go untreated. We discuss additional scenarios. The effectiveness of efforts to educate people about the presence of bed bugs has never been tested, but our sample is useful to guide future studies. We found three sources of information were associated with increased recognition rates of bed bugs: a) previous contacts with bed bugs (60% recognition), b) knowledge from friends or relatives (25%) and school or education courses (15%). By contrast, people who heard of bed bugs from television, print media or the Internet showed reduced recognition rates. We propose that the former factors be tested for educational interventions. In Germany, the bed bug is an estranged creature to many people, a fact that seems to hinder rational approaches to their control.

  20. Bugging forecast: unknown, disliked, occasionally intimate. Bed bugs in Germany meet unprepared people.

    Directory of Open Access Journals (Sweden)

    Conrad Seidel

    Full Text Available Bed bugs appear to be feared more than vector insects and other household pests. The reasons for this exaggerated fear are not fully understood. One hypothesis is that the folk knowledge on recognising and controlling bed bugs decreased as bed bugs became rarer in the 1960s and led to irrational perceptions. Here, we examine people's ability to recognise a bed bug and their response what to do in case of an infestation. We found that 13% of a sample of 391 people in four large German cities recognised a bed bug; 15% of all respondents would call a pest controller in case of bed bug infestation. This results in the pessimistic estimate that 97% of all early-stage infestations could go untreated. We discuss additional scenarios. The effectiveness of efforts to educate people about the presence of bed bugs has never been tested, but our sample is useful to guide future studies. We found three sources of information were associated with increased recognition rates of bed bugs: a previous contacts with bed bugs (60% recognition, b knowledge from friends or relatives (25% and school or education courses (15%. By contrast, people who heard of bed bugs from television, print media or the Internet showed reduced recognition rates. We propose that the former factors be tested for educational interventions. In Germany, the bed bug is an estranged creature to many people, a fact that seems to hinder rational approaches to their control.

  1. Given Enough Eyeballs, All Bugs Are Shallow? Revisiting Eric Raymond with Bug Bounty Programs

    CERN Document Server

    Maillart, Thomas; Grossklags, Jens; Chuang, John

    2016-01-01

    Bug bounty programs offer a modern platform for organizations to crowdsource their software security and for security researchers to be fairly rewarded for the vulnerabilities they find. Little is known however on the incentives set by bug bounty programs: How they drive new bug discoveries, and how they supposedly improve security through the progressive exhaustion of discoverable vulnerabilities. Here, we recognize that bug bounty programs create tensions, for organizations running them on the one hand, and for security researchers on the other hand. At the level of one bug bounty program, security researchers face a sort of St-Petersburg paradox: The probability of finding additional bugs decays fast, and thus can hardly be matched with a sufficient increase of monetary rewards. Furthermore, bug bounty program managers have an incentive to gather the largest possible crowd to ensure a larger pool of expertise, which in turn increases competition among security researchers. As a result, we find that researc...

  2. Learning Through Tutoring: Low-Achieving Childern as Tutors.

    Science.gov (United States)

    Allen, Vernon L.; Feldman, Robert S.

    Low-achieving fifth-grade children either taught a third grader or studied alone for a series of daily sessions. At the end of the two-week period, the low-achievers' performance was significantly better in the tutoring condition than in the studying condition. This showed a reversal in the direction from the initial difference between conditions.…

  3. A Peer Mentor Tutor Program in Physics

    Science.gov (United States)

    Nossal, S. M.; Jacob, A. T.; Buehlman, J. D.; Middlecamp, C. H.

    2001-05-01

    The Peer Mentor Tutor (PMT) program in the University of Wisconsin-Madison's Physics Department matches upper level undergraduate physics majors in small groups with students potentially at-risk for having academic trouble with their gateway introductory non-calculus physics course or for feeling isolated at the University. The program enhances students'learning and confidence by providing an emphasis on problem solving, a supportive environment for asking questions, and opportunities for acquiring missing math skills. The students assisted include, among others, returning adults, students of color,students with English as a second language, and students who have never taken physics in high school. The tutors acquire teaching and leadership experience with ongoing training throughout the year. The Physics PMT program is run in collaboration with a similar program in Chemistry. The peer model is also being applied to other science courses at the University of Wisconsin. We will describe the structure of the Physics PMT program and our current efforts to expand the program into a broader Physics Learning Center that may serve multiple purposes and courses.

  4. Diagnosis of Subtraction Bugs Using Bayesian Networks

    Science.gov (United States)

    Lee, Jihyun; Corter, James E.

    2011-01-01

    Diagnosis of misconceptions or "bugs" in procedural skills is difficult because of their unstable nature. This study addresses this problem by proposing and evaluating a probability-based approach to the diagnosis of bugs in children's multicolumn subtraction performance using Bayesian networks. This approach assumes a causal network relating…

  5. Print a Bed Bug Card - (Single Cards)

    Science.gov (United States)

    Two sets of business-card-sized lists of tips for recognizing bed bugs and the signs of an infestation, including a photo of bed bugs to assist identification. One card is for general use around home or office, the other for travelers.

  6. Bed bugs: clinical relevance and control options.

    Science.gov (United States)

    Doggett, Stephen L; Dwyer, Dominic E; Peñas, Pablo F; Russell, Richard C

    2012-01-01

    Since the late 1990s, bed bugs of the species Cimex lectularius and Cimex hemipterus have undergone a worldwide resurgence. These bed bugs are blood-sucking insects that readily bite humans. Cutaneous reactions may occur and can start out as small macular lesions that can develop into distinctive wheals of around 5 cm in diameter, which are accompanied by intense itching. Occasionally, bullous eruptions may result. If bed bugs are numerous, the patient can present with widespread urticaria or eythematous rashes. Often, bites occur in lines along the limbs. Over 40 pathogens have been detected in bed bugs, but there is no definitive evidence that they transmit any disease-causing organisms to humans. Anemia may result when bed bugs are numerous, and their allergens can trigger asthmatic reactions. The misuse of chemicals and other technologies for controlling bed bugs has the potential to have a deleterious impact on human health, while the insect itself can be the cause of significant psychological trauma. The control of bed bugs is challenging and should encompass a multidisciplinary approach utilizing nonchemical means of control and the judicious use of insecticides. For accommodation providers, risk management procedures should be implemented to reduce the potential of bed bug infestations.

  7. Prevalence, Knowledge, and Concern About Bed Bugs.

    Science.gov (United States)

    Kaylor, Mary Beth; Wenning, Paul; Eddy, Christopher

    2015-01-01

    Recent research suggests that the resurgence of bed bugs in the U.S. has occurred at an alarming rate. Assumptions have been made that socioeconomic status is not associated with the prevalence of bed bug infestations. Little information is available at the local level, however, about the prevalence of bed bugs in private homes. The authors' pilot study aimed to identify prevalence, knowledge, and concern about bed bugs in one higher income village in Ohio utilizing survey methodology. Responses from 96 individuals who completed the Prevalence, Knowledge, and Concern About Bed Bugs survey were utilized for analysis. The majority of the sample respondents were white and 95% reported that they owned their residence. Only 6% knew someone with bed bugs. Additionally, 52% reported they were somewhat concerned about bed bugs. About 46% reported that they had changed their behavior. For a higher income area, the prevalence was dissimilar to the rate reported in the general public (about 20%). This suggests that bed bugs may be an environmental issue effecting low-income populations disproportionately. Further research is needed in areas of differing socioeconomic levels.

  8. Bug City: Spiders and Scorpions [Videotape].

    Science.gov (United States)

    1998

    "Bug City" is a video series created to help children learn about insects and other small critters. All aspects of bug life are touched upon including body structure, food, habitat, life cycle, mating habits, camouflage, mutualism (symbiosis), adaptations, social behavior, and more. Each program features dramatic microscopic photography,…

  9. 乳草长蝽Ubx基因克隆及多转录本分析%Cloning and multiple transcript analysis of Ubx in the large milkweed bug,Oncopeltus fasciatus ( Hemiptera: Lygaeidae)

    Institute of Scientific and Technical Information of China (English)

    田晓轩; 谢强; 卜文俊

    2011-01-01

    The researches focusing on key developmental genes in non-holometabola insects are relatively insufficient, especially for the reports on the structure and sequences of Hox genes. In order to understand the structure of Ubx gene (a member of Hox genes) in non-holometabola insects, we selected the large milkweed bug, Oncopeltusfasciatus (Dallas, 1852), as a representative, and used RACE and RT-PCR to clone the whole ORF of Ubx gene. The results showed that the full-length ORF of Ubx gene of O. fasciatus (Of-Ubx) is 888 bp, encoding 295 aa. Southern blot analysis verified that Of-Ubx exists as a single copy and has introns within it. We found alternative splicing sites between YPWM and homeodomain motif,which lead to 3 types of transcript variants. Compared with the Ubx gene from Drosophila melanogaster (Meigen, 1830), Of-Ubx had similar splicing sites, conserved elements around splicing sites and isoform combination, suggesting that their splicing mechanism should be similar. This is the first detailed report about the multiple transcripts of Ubx genes within Insecta except for the genus Drosophila.%针对非完全变态类昆虫发育关键基因的研究相对匮乏,尤其缺少Hox基因家族的基因结构和序列信息.为了研究Hox基因家族成员之一的Ubx基因在非完全变态类昆虫中的结构特点,本实验选取乳草长蝽Oncopeltus fasciatus(Dallas,1852)为代表,应用RACE和RT-PCR技术,对其Ubx基因的全长开放阅读框进行克隆.结果显示:乳草长蝽Ubx基因(Of-Ubx)开放阅读框全长888 bp,推测的完整蛋白含有295个氨基酸.Southern blot证实Ubx基因以单拷贝形式存在且含有内含子.在Of-Ubx的YPWM基序和同源异型结构域之间存在选择性剪接位点,可产生3种不同转录本.分析以上实验结果,发现乳草长蝽与黑腹果蝇Drosophila melanogaster(Meigen,1830)的Ubx基因拥有相似的剪接位置、剪接体组合和边界序列,提示它们很可能具有相似的剪接机理.

  10. Intelligent Tutoring Systems as Design.

    Science.gov (United States)

    Wu, Albert K. W.; Lee, M. C.

    1998-01-01

    Proposes the notion of intelligent tutoring systems (ITS) as design in order to engage ITS development with more rigor. Topics include engineering design versus ITS design; systems approach; design as problem solving; a hierarchy of paradigms; the emergence of an agent-theoretic approach; and the need for an ITS design notation. (Author/LRW)

  11. A New Intelligent Tutoring System

    Science.gov (United States)

    Ford, Lindsey

    2008-01-01

    Early in 1984, Logica started an ICAI research contract with MoD (Procurement Executive), which was to be undertaken in collaboration with the technical authority at the Royal Signals and Radar Establishment, Malvern. A prototype system, which has become known as TUTOR, was scheduled for delivery to the client later in 1985. Initially, and for…

  12. A New Intelligent Tutoring System

    Science.gov (United States)

    Ford, Lindsey

    2008-01-01

    Early in 1984, Logica started an ICAI research contract with MoD (Procurement Executive), which was to be undertaken in collaboration with the technical authority at the Royal Signals and Radar Establishment, Malvern. A prototype system, which has become known as TUTOR, was scheduled for delivery to the client later in 1985. Initially, and for…

  13. Bayesian modeling using WinBUGS

    CERN Document Server

    Ntzoufras, Ioannis

    2009-01-01

    A hands-on introduction to the principles of Bayesian modeling using WinBUGS Bayesian Modeling Using WinBUGS provides an easily accessible introduction to the use of WinBUGS programming techniques in a variety of Bayesian modeling settings. The author provides an accessible treatment of the topic, offering readers a smooth introduction to the principles of Bayesian modeling with detailed guidance on the practical implementation of key principles. The book begins with a basic introduction to Bayesian inference and the WinBUGS software and goes on to cover key topics, including: Markov Chain Monte Carlo algorithms in Bayesian inference Generalized linear models Bayesian hierarchical models Predictive distribution and model checking Bayesian model and variable evaluation Computational notes and screen captures illustrate the use of both WinBUGS as well as R software to apply the discussed techniques. Exercises at the end of each chapter allow readers to test their understanding of the presented concepts and all ...

  14. Bed Bug Infestations and Control Practices in China: Implications for Fighting the Global Bed Bug Resurgence

    Directory of Open Access Journals (Sweden)

    Changlu Wang

    2011-04-01

    Full Text Available The bed bug resurgence in North America, Europe, and Australia has elicited interest in investigating the causes of the widespread and increasing infestations and in developing more effective control strategies. In order to extend global perspectives on bed bug management, we reviewed bed bug literature in China by searching five Chinese language electronic databases. We also conducted telephone interviews of 68 pest control firms in two cities during March 2011. In addition, we conducted telephone interviews to 68 pest control companies within two cities in March 2011. Two species of bed bugs (Cimex lectularius L. and Cimex hemipterus (F. are known to occur in China. These were common urban pests before the early1980s. Nationwide “Four-Pest Elimination” campaigns (bed bugs being one of the targeted pests were implemented in China from 1960 to the early 1980s. These campaigns succeeded in the elimination of bed bug infestations in most communities. Commonly used bed bug control methods included applications of hot water, sealing of bed bug harborages, physical removal, and applications of residual insecticides (mainly organophosphate sprays or dusts. Although international and domestic travel has increased rapidly in China over the past decade (2000–2010, there have only been sporadic new infestations reported in recent years. During 1999–2009, all documented bed bug infestations were found in group living facilities (military dormitories, worker dormitories, and prisons, hotels, or trains. One city (Shenzhen city near Hong Kong experienced significantly higher number of bed bug infestations. This city is characterized by a high concentration of migratory factory workers. Current bed bug control practices include educating residents, washing, reducing clutter, putting items under the hot sun in summer, and applying insecticides (pyrethroids or organophosphates. There have not been any studies or reports on bed bug insecticide

  15. Two approaches to physics tutoring

    Science.gov (United States)

    Solomaniuck, Tania

    One in two first-year students at science or biomedical faculties fail in basic subjects such as mathematics, chemistry or physics. Course-specific tutoring is one of the available means for improving their performance. In the present research, two tutoring models are developed. Both incorporate independent learning, but from different perspectives and priorities. A pragmatic tutoring approach. The first part of the thesis describes the search process for an optimal course-specific tutoring strategy for a standard first-year physics course in life sciences curricula. After a number of empirical research rounds, a pragmatic compromise emerged as the most suitable form of tutoring. The approach is characterised by: (1) priority to questions from students; (2) a high degree of interactivity with the tutor and among students; (3) due consideration to the number of questions to be dealt with and the depth in which they should be discussed. Most students participating in the tutoring sessions expressed their satisfaction and performed sufficiently well in their exams. However, there was still a problem: the students' insight into the course material was restricted to first-order processing of the syllabus. While this would be satisfactory in non-scientific study programmes, it is deemed insufficient in programmes where deeper insight is required in order that students be able to deal adequately with new conceptual questions or problems. In-depth tutoring. In science programmes, the core objective is for students to acquire in-depth knowledge. Therefore, science educators are designing and studying teaching methods that are geared not only to the acquisition of in-depth knowledge as such, but also to the motivation of students to take a more in-depth approach to learning. Some of the crucial notions in their research are: the extent to which the course content ties in with students' prior knowledge, problem-setting strategies and concept-context linking. 'In

  16. Peer feedback on complex tasks by tutors trained in content knowledge or tutoring skills

    NARCIS (Netherlands)

    Hsiao, Amy; Brouns, Francis; Van Bruggen, Jan; Sloep, Peter

    2013-01-01

    Hsiao, Y. P., Brouns, F., Van Bruggen, J., & Sloep, P. B. (2013, 7 November). Peer feedback on complex tasks by tutors trained in content knowledge or tutoring skills. Presentation at ICO Fall School, The Maastricht University, Maastricht, The Netherlands.

  17. Peer feedback on complex tasks by tutors trained in content knowledge or tutoring skills

    NARCIS (Netherlands)

    Hsiao, Amy; Brouns, Francis; Van Bruggen, Jan; Sloep, Peter

    2013-01-01

    Hsiao, Y. P., Brouns, F., Van Bruggen, J., & Sloep, P. B. (2013, 7 November). Peer feedback on complex tasks by tutors trained in content knowledge or tutoring skills. Presentation at ICO Fall School, The Maastricht University, Maastricht, The Netherlands.

  18. The Face of Private Tutoring in Russia: Evidence from Online Marketing by Private Tutors

    Science.gov (United States)

    Kozar, Olga

    2013-01-01

    Private tutoring is a common and worldwide phenomenon. However, there is a dearth of up-to-date research on private tutoring compared with that on institutional one-to-one teaching, which could be explained by challenges associated with data collection. This article proposes using publicly available online advertisements of private tutors as a…

  19. Techniques for Specifying Bug Patterns

    Energy Technology Data Exchange (ETDEWEB)

    Quinlan, D J; Vuduc, R W; Misherghi, G

    2007-04-30

    We present our on-going work to develop techniques for specifying source code signatures of bug patterns. Specifically, we discuss two approaches. The first approach directly analyzes a program in the intermediate representation (IR) of the ROSE compiler infrastructure using ROSE's API. The second analyzes the program using the bddbddb system of Lam, Whaley, et al.. In this approach, we store the IR produced by ROSE as a relational database, express patterns as declarative inference rules on relations in the language Datalog, and bddbddb implements the Datalog programs using binary decision diagram (BDD) techniques. Both approaches readily apply to large-scale applications, since ROSE provides full type analysis, control flow, and other available analysis information. In this paper, we primarily consider bug patterns expressed with respect to the structure of the source code or the control flow, or both. More complex techniques to specify patterns that are functions of data flow properties may be addressed by either of the above approaches, but are not directly treated here. Our Datalog-based work includes explicit support for expressing patterns on the use of the Message Passing Interface (MPI) in parallel distributed memory programs. We show examples of this on-going work as well.

  20. Consumers as tutors – legitimate teachers?

    Directory of Open Access Journals (Sweden)

    Owen Cathy

    2004-09-01

    Full Text Available Abstract Background The aim of this study was to research the feasibility of training mental health consumers as tutors for 4th year medical students in psychiatry. Methods A partnership between a consumer network and an academic unit in Psychological Medicine was formed to jointly develop a training package for consumer tutors and a curriculum in interviewing skills for medical students. Student attitudes to mental health consumers were measured pre and post the program. All tutorial evaluation data was analysed using univariate statistics. Both tutors and students evaluated the teaching program using a 4 point rating scale. The mean scores for teaching and content for both students and tutors were compared using an independent samples t-test. Results Consumer tutors were successfully trained and accredited as tutors and able to sustain delivery of tutorials over a 4 year period. The study found that whilst the medical students started with positive attitudes towards consumers prior to the program, there was a general trend towards improved attitude across all measures. Other outcomes for tutors and students (both positive and negative are described. Conclusions Consumer tutors along with professional tutors have a place in the education of medical students, are an untapped resource and deliver largely positive outcomes for students and themselves. Further possible developments are described.

  1. Variation of acephate susceptibility and correlation with Esterase and Glutathione S-transferase activities in field populations of the tarnished plant bug, Lygus lineolaris

    Science.gov (United States)

    The tarnished plant bug (TPB) has increasingly become an economically important pest of cotton. Heavy dependence on insecticides, particularly organophosphates and pyrethroids, for TPB control facilitated resistance development to multiple classes of insecticides. To better understand resistance and...

  2. Electronic Algebra and Calculus Tutor

    Directory of Open Access Journals (Sweden)

    Larissa Fradkin

    2012-06-01

    Full Text Available Modern undergraduates join science and engineering courses with poorer mathematical background than most contemporaries of the current faculty had when they were freshers. The problem is very acute in the United Kingdom but more and more countries adopt less resource intensive models of teaching and the problem spreads. University tutors and lecturers spend more and more time covering the basics. However, most of them still rely on traditional methods of delivery which presuppose that learners have a good memory and considerable time to practice, so that they can memorize disjointed facts and discover for themselves various connections between the underlying concepts. These suppositions are particularly unrealistic when dealing with a large number of undergraduates who are ordinary learners with limited mathematics background. The first author has developed a teaching system that allows such adult learners achieve relatively deep learning of mathematics – and remarkably quickly – through a teacher-guided (often called Socratic dialog, which aims at the frequent reinforcement of basic mathematical abstractions through Eulerian sequencing. These ideas have been applied to create a prototype of a Cognitive Mathematics Tutoring System aimed at teaching basic mathematics to University freshers., an electronic Personal Algebra and Calculus Tutor (e- PACT.

  3. Insecticide resistance and resistance mechanisms in bed bugs, Cimex spp. (Hemiptera: Cimicidae).

    Science.gov (United States)

    Dang, Kai; Doggett, Stephen L; Veera Singham, G; Lee, Chow-Yang

    2017-06-29

    The worldwide resurgence of bed bugs [both Cimex lectularius L. and Cimex hemipterus (F.)] over the past two decades is believed in large part to be due to the development of insecticide resistance. The transcriptomic and genomic studies since 2010, as well as morphological, biochemical and behavioral studies, have helped insecticide resistance research on bed bugs. Multiple resistance mechanisms, including penetration resistance through thickening or remodelling of the cuticle, metabolic resistance by increased activities of detoxification enzymes (e.g. cytochrome P450 monooxygenases and esterases), and knockdown resistance by kdr mutations, have been experimentally identified as conferring insecticide resistance in bed bugs. Other candidate resistance mechanisms, including behavioral resistance, some types of physiological resistance (e.g. increasing activities of esterases by point mutations, glutathione S-transferase, target site insensitivity including altered AChEs, GABA receptor insensitivity and altered nAChRs), symbiont-mediated resistance and other potential, yet undiscovered mechanisms may exist. This article reviews recent studies of resistance mechanisms and the genes governing insecticide resistance, potential candidate resistance mechanisms, and methods of monitoring insecticide resistance in bed bugs. This article provides an insight into the knowledge essential for the development of both insecticide resistance management (IRM) and integrated pest management (IPM) strategies for successful bed bug management.

  4. Side effects of kaolin particle films on apple orchard bug, beetle and spider communities

    NARCIS (Netherlands)

    Marko, V.; Bogya, S.; Kondorosy, E.; Blommers, L.H.M.

    2010-01-01

    The effects of multiple applications of hydrophobic kaolin particle film on apple orchard bug (Heteroptera), beetle (Coleoptera) and spider (Araneae) assemblages were studied in the Netherlands. Insecticide-free orchard plots served as a control. The kaolin applications significantly reduced the abu

  5. Side effects of kaolin particle films on apple orchard bug, beetle and spider communities

    NARCIS (Netherlands)

    Marko, V.; Bogya, S.; Kondorosy, E.; Blommers, L.H.M.

    2010-01-01

    The effects of multiple applications of hydrophobic kaolin particle film on apple orchard bug (Heteroptera), beetle (Coleoptera) and spider (Araneae) assemblages were studied in the Netherlands. Insecticide-free orchard plots served as a control. The kaolin applications significantly reduced the abu

  6. Side effects of kaolin particle films on apple orchard bug, beetle and spider communities

    NARCIS (Netherlands)

    Marko, V.; Bogya, S.; Kondorosy, E.; Blommers, L.H.M.

    2010-01-01

    The effects of multiple applications of hydrophobic kaolin particle film on apple orchard bug (Heteroptera), beetle (Coleoptera) and spider (Araneae) assemblages were studied in the Netherlands. Insecticide-free orchard plots served as a control. The kaolin applications significantly reduced the

  7. Protecting Your Home from Bed Bugs

    Science.gov (United States)

    ... bed bugs easier to see. Be sure to purchase a high quality encasement that will resist tearing ... Contact Us Hotlines FOIA Requests Frequent Questions Follow. Facebook Twitter YouTube Flickr Instagram Last updated on December ...

  8. Preparing for Treatment Against Bed Bugs

    Science.gov (United States)

    Whether hiring a pest management professional or trying to eliminate the bugs yourself, taking these first steps will increase effectiveness and speed: reduce clutter, use encasements on your mattress and box spring, vacuum and heat treat, and seal cracks.

  9. Bed Bug Clearinghouse Publications in Other Languages

    Science.gov (United States)

    This information is intended to help states, communities, and consumers prevent and control bed bug infestations. These outreach materials are available in Spanish, Chinese, and French; and include action plans based on an IPM approach.

  10. The existence of a bug chasing subculture.

    Science.gov (United States)

    Moskowitz, David A; Roloff, Michael E

    2007-01-01

    This study attempted to authenticate the existence of a controversial subculture of gay men, the 'bug chasers', whose main attribute is an active desire to voluntarily contract the human immunodeficiency virus (HIV), and examine the tenacity with which this subculture actually searches for seroconversion. Using a quasi-randomized survey of personal profiles, bug chasers were compared against barebackers, a culture of gay men that practice intentional unprotected anal intercourse. Bug chasers were authenticated as an observable subculture of barebackers where most reported apathy to the serostatus of their partner or an active want of a serodiscordant partner, and a preference towards practicing unprotected anal intercourse. As anticipated, two subgroups with varying tenacities were found within the sample of bug chasers. Apathetic chasers were found only to be in search of partners with sero-ambiguous status. Ardent chasers were found only to be in search of certifiably serodiscordant partners.

  11. Bed Bugs are Public Health Pests

    Science.gov (United States)

    EPA and the Centers for Disease Control and Prevention (CDC) issued a joint statement on the public health impacts of bed bugs, which are blood-sucking ectoparasites (external parasites). EPA also has a pesticide registration notice on this topic.

  12. Do-it-yourself Bed Bug Control

    Science.gov (United States)

    Controlling bed bugs is complex. Using an integrated pest management (IPM) approach incorporates both non-chemical and pesticide methods. Success depends on the extent of the infestation, clutter on site, and resident participation.

  13. Effectiveness of bed bug monitors for detecting and trapping bed bugs in apartments.

    Science.gov (United States)

    Wang, Changlu; Tsai, Wan-Tien; Cooper, Richard; White, Jeffrey

    2011-02-01

    Bed bugs, Cimex lectularius L., are now considered a serious urban pest in the United States. Because they are small and difficult to find, there has been strong interest in developing and using monitoring tools to detect bed bugs and evaluate the results of bed bug control efforts. Several bed bug monitoring devices were developed recently, but their effectiveness is unknown. We comparatively evaluated three active monitors that contain attractants: CDC3000, NightWatch, and a home-made dry ice trap. The Climbup Insect Interceptor, a passive monitor (without attractants), was used for estimating the bed bug numbers before and after placing active monitors. The results of the Interceptors also were compared with the results of the active monitors. In occupied apartments, the relative effectiveness of the active monitors was: dry ice trap > CDC3000 > NightWatch. In lightly infested apartments, the Interceptor (operated for 7 d) trapped similar number of bed bugs as the dry ice trap (operated for 1 d) and trapped more bed bugs than CDC3000 and NightWatch (operated for 1 d). The Interceptor was also more effective than visual inspections in detecting the presence of small numbers of bed bugs. CDC3000 and the dry ice trap operated for 1 d were equally as effective as the visual inspections for detecting very low level of infestations, whereas 1-d deployment of NightWatch detected significantly lower number of infestations compared with visual inspections. NightWatch was designed to be able to operate for several consecutive nights. When operated for four nights, NightWatch trapped similar number of bed bugs as the Interceptors operated for 10 d after deployment of NightWatch. We conclude these monitors are effective tools in detecting early bed bug infestations and evaluating the results of bed bug control programs.

  14. Metabolic Resistance in Bed Bugs

    Directory of Open Access Journals (Sweden)

    Omprakash Mittapalli

    2011-03-01

    Full Text Available Blood-feeding insects have evolved resistance to various insecticides (organochlorines, pyrethroids, carbamates, etc. through gene mutations and increased metabolism. Bed bugs (Cimex lectularius are hematophagous ectoparasites that are poised to become one of the major pests in households throughout the United States. Currently, C. lectularius has attained a high global impact status due to its sudden and rampant resurgence. Resistance to pesticides is one factor implicated in this phenomenon. Although much emphasis has been placed on target sensitivity, little to no knowledge is available on the role of key metabolic players (e.g., cytochrome P450s and glutathione S-transferases towards pesticide resistance in C. lectularius. In this review, we discuss different modes of resistance (target sensitivity, penetration resistance, behavioral resistance, and metabolic resistance with more emphasis on metabolic resistance.

  15. Metabolic Resistance in Bed Bugs.

    Science.gov (United States)

    Mamidala, Praveen; Jones, Susan C; Mittapalli, Omprakash

    2011-03-18

    Blood-feeding insects have evolved resistance to various insecticides (organochlorines, pyrethroids, carbamates, etc.) through gene mutations and increased metabolism. Bed bugs (Cimex lectularius) are hematophagous ectoparasites that are poised to become one of the major pests in households throughout the United States. Currently, C. lectularius has attained a high global impact status due to its sudden and rampant resurgence. Resistance to pesticides is one factor implicated in this phenomenon. Although much emphasis has been placed on target sensitivity, little to no knowledge is available on the role of key metabolic players (e.g., cytochrome P450s and glutathione S-transferases) towards pesticide resistance in C. lectularius. In this review, we discuss different modes of resistance (target sensitivity, penetration resistance, behavioral resistance, and metabolic resistance) with more emphasis on metabolic resistance.

  16. A Comparison of Peer and Tutor Feedback

    Science.gov (United States)

    Hamer, John; Purchase, Helen; Luxton-Reilly, Andrew; Denny, Paul

    2015-01-01

    We report on a study comparing peer feedback with feedback written by tutors on a large, undergraduate software engineering programming class. Feedback generated by peers is generally held to be of lower quality to feedback from experienced tutors, and this study sought to explore the extent and nature of this difference. We looked at how…

  17. Electronic Tutoring: Long Distance and Long Term.

    Science.gov (United States)

    Stephenson, Denise R.; Mayberry, Bob

    Electronic tutoring can be valuable for writers and should be offered in more university settings, not just in computer labs. Among its advantages is the speed with which commentary can be returned by e-mail. Other advantages were evident in a reciprocal tutoring relationship carried on by two academics in different states. They chose not to edit…

  18. Analysis of Cognitive Tutor Geometry Curriculum

    Science.gov (United States)

    Bibi, Tauqir

    2010-01-01

    The Carnegie Learning Cognitive Tutor curricula are based on cognitive models, which include a representation of the learner's thinking, strategies, and misconceptions. The Cognitive Tutor curricula typically speed up learning and yield greater learning as compared to traditional math curricula (Morgan & Ritter, 2002; Sarkis, 2004; Koedinger,…

  19. Summative Evaluation of the SINCGARS Tutor.

    Science.gov (United States)

    Orey, Michael; Zhao, Ruimin; Fan, Huey-Ling; Keenan, Ron

    1998-01-01

    Describes the results of an effectiveness evaluation of an "intelligently coached simulation," the SINCGARS Tutor, that was developed to train military officers how to operate a SINCGARS radio. Posttests showed officers trained on the computerized tutor performed more accurately than a group trained on the actual equipment. (Author/LRW)

  20. Rules of engagement: developing the online tutor

    Directory of Open Access Journals (Sweden)

    Lucy Golden

    2012-08-01

    Full Text Available This paper considers professional development in a context that is familiar and problematic to teaching teams in tertiary education everywhere, that of delivering online programmes with an ever-decreasing complement of staff. The Teaching Qualification Further Education (TQFE teaching team at University of Dundee confronted the reality of reduced staff numbers by centralising tutoring and support for programme participants. The new system involves standardising tutoring as far as possible through generic email, blog and microblog accounts, all badged “TQFE-Tutor” and staffed on a roster basis. Once the new “rules of engagement” via TQFE-Tutor were in place, it became clear that in addition to benefits in terms of student support, there were other unintended positive consequences: opportunities for informal professional development for staff and the promotion of effective team working. The experience of collective tutoring has facilitated collaboration on a range of innovations within online learning. This paper describes the evolution of the TQFE-Tutor innovation and reports upon a small scale study which was carried out to gather the views of the tutor team working with TQFE-Tutor. The authors conclude that the centralisation of communication and tutoring on the TQFE programme has been highly beneficial in terms of professional development for the team.

  1. Bridge: Intelligent Tutoring with Intermediate Representations

    Science.gov (United States)

    1988-05-01

    Research and Development Center and Psychology Department University of Pittsburgh Pittsburgh, PA. 15260 The Artificial Intelligence and Psychology...problem never introduces more than one unfamiliar plan. Inteligent Tutoring With Intermediate Representations - Bonar and Cunniigbam 4 You must have a... Inteligent Tutoring With ntermediate Representations - Bonar and Cunningham 7 The requirements are specified at four differcnt levels, corresponding to

  2. Concentrating on Affective Feedforward in Online Tutoring

    Science.gov (United States)

    Chen, Ya-Ting; Chou, Yung-Hsin; Cowan, John

    2014-01-01

    With considerable input from the student voice, the paper centres on a detailed account of the experiences of Western academic, tutoring Eastern students online to develop their critical thinking skills. From their online experiences together as tutor and students, the writers present a considered case for the main emphasis in facilitative online…

  3. Widespread distribution of knockdown resistance mutations in the bed bug, Cimex lectularius (Hemiptera: Cimicidae), populations in the United States.

    Science.gov (United States)

    Zhu, Fang; Wigginton, John; Romero, Alvaro; Moore, Ali; Ferguson, Kimberly; Palli, Roshan; Potter, Michael F; Haynes, Kenneth F; Palli, Subba R

    2010-04-01

    We previously reported high deltamethrin resistance in bed bugs, Cimex lectularius, collected from multiple areas of the United States (Romero et al., 2007). Recently, two mutations, the Valine to Leucine mutation (V419L) and the Leucine to Isoleucine mutation (L925I) in voltage-gated sodium channel alpha-subunit gene, had been identified to be responsible for knockdown resistance (kdr) to deltamethrin in bed bugs collected from New York (Yoon et al., 2008). The current study was undertaken to investigate the distribution of these two kdr mutations in 110 bed bug populations collected in the United States. Out of the 17 bed bug populations that were assayed for deltamethrin susceptibility, two resistant populations collected in the Cincinnati area and three deltamethrin-susceptible lab colonies showed neither of the two reported mutations (haplotype A). The remaining 12 populations contained L925I or both V419L and L925I mutations in voltage-gated sodium channel alpha-subunit gene (haplotypes B&C). In 93 populations that were not assayed for deltamethrin susceptibility, 12 contained neither of the two mutations (haplotype A) and 81 contained L925I or V419L or both mutations (haplotypes B-D). Thus, 88% of the bed bug populations collected showed target-site mutations. These data suggest that deltamethrin resistance conferred by target-site insensitivity of sodium channel is widely spread in bed bug populations across the United States.

  4. Carbon dioxide fumigation for controlling bed bugs.

    Science.gov (United States)

    Wang, Changlu; Lü, Lihua; Xu, Ming

    2012-09-01

    We investigated the potential of carbon dioxide (CO2) fumigation as a method for controlling bed bugs, Cimex lectularius L. The effect of bed bug developmental stage, temperature, and CO2 concentration on the minimum time to kill 100% of bed bugs was determined. The minimum CO2 concentration lethal to all bed bug stages was approximately 30% with 24 h exposure time at 25 degrees C. The minimum fumigation time required to kill 100% of eggs using 100% CO2 at 20, 25, and 30 degrees C were 3, 7, and 8 h, respectively; the minimum fumigation time to kill 100% of adult males/nymphs were 8, 13, and 14 h, respectively. The minimum time to kill 100% of adult males/nymphs using 50 and 70% CO2 at 25 degrees C were 18 and 16 h, respectively. We found that eggs were not completely killed after 24 h fumigation when the CO2 concentration was lower than 80%. Thus, bed bug eggs were more susceptible to 100% CO2 fumigation than nymphs and adult males but more tolerant than nymphs and adult males with lower CO2 concentration (50-80%). There were no significant differences among nymphs, adult males, and adult females in their susceptibility to 100% CO2 fumigation. A 24 h fumigation in sealed 158 liter (42 gallon) heavy duty garbage bags filled 90% full with fabric materials and/or boxes and 1,350 g dry ice per bag was sufficient to kill all stages of bed bugs hidden in the materials at room temperature (23-24 degrees C). Sealed heavy duty garbage bags maintained > or = 94% CO2 for at least 24 h. Custom-made double zipper plastic bags (122 x 183 cm) were also used to evaluate the effectiveness of CO2 fumigation for controlling bed bugs. Each bag was filled with fabric and boxes to 50-90% full. Bed bugs were hidden in various locations of each bag. CO2 was introduced into the bags through a CO2 cylinder. CO2 fumigation lasting 24-48 h was sufficient to kill all stages of bed bugs at room temperature, depending on the quantity of materials placed in each bag and whether CO2 was

  5. A Conversational Intelligent Tutoring System to Automatically Predict Learning Styles

    Science.gov (United States)

    Latham, Annabel; Crockett, Keeley; McLean, David; Edmonds, Bruce

    2012-01-01

    This paper proposes a generic methodology and architecture for developing a novel conversational intelligent tutoring system (CITS) called Oscar that leads a tutoring conversation and dynamically predicts and adapts to a student's learning style. Oscar aims to mimic a human tutor by implicitly modelling the learning style during tutoring, and…

  6. Learning from a Computer Tutor with Natural Language Capabilities

    Science.gov (United States)

    Michael, Joel; Rovick, Allen; Glass, Michael; Zhou, Yujian; Evens, Martha

    2003-01-01

    CIRCSIM-Tutor is a computer tutor designed to carry out a natural language dialogue with a medical student. Its domain is the baroreceptor reflex, the part of the cardiovascular system that is responsible for maintaining a constant blood pressure. CIRCSIM-Tutor's interaction with students is modeled after the tutoring behavior of two experienced…

  7. Efektivitas Model Pembelajaran Kooperatif Tipe Student Team Achievement Division (STAD yang Dimodifikasi dengan Tutor Sebaya ditinjau dari Kecerdasan Majemuk Siswa.

    Directory of Open Access Journals (Sweden)

    Dwi Mei Heni

    2014-01-01

    Full Text Available The Effectiveness Model of Modified Student Team Achievement Division (STAD Type of Cooperative Learning with Peer tutoring Viewed from the Student’s Multiple Intelligences. This research was conducted to find out: Which learning model giving better student learning achievement, STAD or modified STAD with peer tutoring. The research population was all XI graders of Vocational School (SMK throughout Bojonegoro Regency in the school year of 2011/2012. The sampling used was stratified cluster random sampling and then chosen three schools namely SMKN 1 Bojonegoro, SMK Muhammadiyah 2 Sumberrejo, and SMK PGRI 3 Bojonegoro. Technique of analyzing data used was two-way anava 2x3 with different cell. In this research, it can be concluded that The student with the modified STAD type of cooperative learning with peer tutoring have better mathematics learning achievement than the students with STAD type of cooperative learning.   Keywords : Modified STAD with peer tutoring, Multiple Intelligences, Mathematics Learning Achievement

  8. Bed bugs (Cimex lectularius) as vectors of Trypanosoma cruzi.

    Science.gov (United States)

    Salazar, Renzo; Castillo-Neyra, Ricardo; Tustin, Aaron W; Borrini-Mayorí, Katty; Náquira, César; Levy, Michael Z

    2015-02-01

    Populations of the common bed bug, Cimex lectularius, have recently undergone explosive growth. Bed bugs share many important traits with triatomine insects, but it remains unclear whether these similarities include the ability to transmit Trypanosoma cruzi, the etiologic agent of Chagas disease. Here, we show efficient and bidirectional transmission of T. cruzi between hosts and bed bugs in a laboratory environment. Most bed bugs that fed on experimentally infected mice acquired the parasite. A majority of previously uninfected mice became infected after a period of cohabitation with exposed bed bugs. T. cruzi was also transmitted to mice after the feces of infected bed bugs were applied directly to broken host skin. Quantitative bed bug defecation measures were similar to those of important triatomine vectors. Our findings suggest that the common bed bug may be a competent vector of T. cruzi and could pose a risk for vector-borne transmission of Chagas disease.

  9. Bed Bugs (Cimex lectularius) as Vectors of Trypanosoma cruzi

    Science.gov (United States)

    Salazar, Renzo; Castillo-Neyra, Ricardo; Tustin, Aaron W.; Borrini-Mayorí, Katty; Náquira, César; Levy, Michael Z.

    2015-01-01

    Populations of the common bed bug, Cimex lectularius, have recently undergone explosive growth. Bed bugs share many important traits with triatomine insects, but it remains unclear whether these similarities include the ability to transmit Trypanosoma cruzi, the etiologic agent of Chagas disease. Here, we show efficient and bidirectional transmission of T. cruzi between hosts and bed bugs in a laboratory environment. Most bed bugs that fed on experimentally infected mice acquired the parasite. A majority of previously uninfected mice became infected after a period of cohabitation with exposed bed bugs. T. cruzi was also transmitted to mice after the feces of infected bed bugs were applied directly to broken host skin. Quantitative bed bug defecation measures were similar to those of important triatomine vectors. Our findings suggest that the common bed bug may be a competent vector of T. cruzi and could pose a risk for vector-borne transmission of Chagas disease. PMID:25404068

  10. Could You Spot Bed Bugs in A Hotel Room?

    Science.gov (United States)

    ... gov/news/fullstory_166585.html Could You Spot Bed Bugs in a Hotel Room? Survey finds they're ... HealthDay News) -- While many travelers think that finding bed bugs in their hotel room would be the stuff ...

  11. Funciones y perfil del tutor

    OpenAIRE

    Baptista, Maria da Nazare Mesquita Martins dos Santos; Universidade Lusofona de Lisboa

    2011-01-01

    Após uma curta introdução relativa ao conceito de educação – formação, são abordadas as características e as funções inerentes à figura do professor tutor. É igualmente salientada a importância que deve ser dada à formação dos professores para que a escola possa fornecer uma resposta eficaz aos desafios constantes impostos pela sociedade. This paper intends to explain...

  12. Tutoring in problem-based learning medical curricula: the influence of tutor background and style on effectiveness

    Directory of Open Access Journals (Sweden)

    Régo Patricia

    2005-06-01

    Full Text Available Abstract Background Evidence for the superiority of particular characteristics in PBL tutors in medical curricula is generally inconclusive. Most studies have investigated the effectiveness of content experts compared with that of non-experts as measured either by student satisfaction or academic achievement. A few have compared academic staff tutors with student tutors. The purpose of this study was to investigate the relationship between students' perception of overall tutor effectiveness, particular tutor behaviours, clinical qualifications and academic appointment. Method A questionnaire designed to evaluate particular aspects of PBL tutoring technique, related either to subject-matter knowledge or to process-facilitation skill, as well as overall effectiveness, was distributed to students in first year of a PBL medical program at the end of each of three tutor terms. A total of 76 tutor terms were included in the study. Data analysis compared clinical with non-clinical tutors, and staff with non-staff tutors. Results Clinically qualified tutors used their subject-matter knowledge significantly more than non-clinical tutors and were seen as being more empathic with their students. Staff tutors placed more emphasis on assessment than non-staff tutors and were seen as having greater skill in establishing and maintaining an environment of cooperation within their PBL groups than non-staff tutors. Conclusion These results suggest that both subject-matter knowledge and process-facilitation skills are necessary but not individually sufficient characteristics of effective tutors.

  13. Effects of training peer tutors in content knowledge versus tutoring skills on giving feedback to help tutees’ complex tasks

    NARCIS (Netherlands)

    Hsiao, Amy; Brouns, Francis; Van Bruggen, Jan; Sloep, Peter

    2015-01-01

    This study aims to investigate the effectiveness of training tutors in content knowledge of a particular domain versus training them in tutoring skills of pedagogical knowledge when tutoring on a complex tutee task. Forty-seven tutor-tutee pairs of fourth year secondary school students were created

  14. Pathogenesis of Crohn’s disease: Bug or no bug

    Institute of Scientific and Technical Information of China (English)

    Marta; Maia; Bosca-Watts; Joan; Tosca; Rosario; Anton; Maria; Mora; Miguel; Minguez; Francisco; Mora

    2015-01-01

    The possibility of an infectious origin in inflammatory bowel disease(IBD)has been postulated since the first description of Crohn’s disease(CD).Many observations implicate bacteria as a trigger for the development of CD:lesions occur in regions with higher bacterial concentrations;aphthous ulcers occur in Peyer’s patches;inflammation resolves when the fecal stream is diverted and is reactivated following reinfusion ofbowel contents;severity of the disease is correlated with bacterial density in the mucosa;granulomas can contain bacteria;and susceptible mice raised in germfree conditions develop inflammation when bacteria are introduced in the 1990’s,several studies sought to establish a relationship with viral infections and the onset of IBD,finally concluding that no direct link had been demonstrated.In the past fifteen years,evidence relating IBD pathogenesis to Mycobacterium avium paratuberculosis,salmonella,campylobacter,etc.,has been found.The tendency now under discussion to regard microbiota as the primary catalyst has led to the latest studies on microbiota as pathogens,focusing on Escherichia coli,mainly in ileal CD.The present review discusses the literature available on these"bugs".

  15. Mining Bug Databases for Unidentified Software Vulnerabilities

    Energy Technology Data Exchange (ETDEWEB)

    Dumidu Wijayasekara; Milos Manic; Jason Wright; Miles McQueen

    2012-06-01

    Identifying software vulnerabilities is becoming more important as critical and sensitive systems increasingly rely on complex software systems. It has been suggested in previous work that some bugs are only identified as vulnerabilities long after the bug has been made public. These vulnerabilities are known as hidden impact vulnerabilities. This paper discusses the feasibility and necessity to mine common publicly available bug databases for vulnerabilities that are yet to be identified. We present bug database analysis of two well known and frequently used software packages, namely Linux kernel and MySQL. It is shown that for both Linux and MySQL, a significant portion of vulnerabilities that were discovered for the time period from January 2006 to April 2011 were hidden impact vulnerabilities. It is also shown that the percentage of hidden impact vulnerabilities has increased in the last two years, for both software packages. We then propose an improved hidden impact vulnerability identification methodology based on text mining bug databases, and conclude by discussing a few potential problems faced by such a classifier.

  16. Exposure of Bed Bugs to Metarhizium anisopliae at Different Humidities.

    Science.gov (United States)

    Ulrich, Kevin R; Feldlaufer, Mark F; Kramer, Matthew; St Leger, Raymond J

    2014-12-01

    Bed bugs Cimex lectularius L. were exposed to conidia (spores) of the entomopathogenic fungus Metarhizium anisopliae by feeding, aerosol spray, or contact with a treated surface. Feeding experiments demonstrated that bed bugs were innately susceptible to this fungus. However, only at 98% humidity were mortality rates high, regardless of whether bed bugs were sprayed with a fungal solution or contacted a treated surface. Mortality in treated bed bugs at ambient humidity did not increase when these bed bugs were kept in aggregation with other bed bugs that had recently blood fed to repletion. Based on these laboratory studies, we conclude that M. anisopliae is a poor pathogen for use in control of bed bugs, particularly at humidities that would likely be encountered under field conditions. © 2014 Entomological Society of America.

  17. "Kissing bugs": potential disease vectors and cause of anaphylaxis.

    Science.gov (United States)

    Klotz, John H; Dorn, Patricia L; Logan, Joy L; Stevens, Lori; Pinnas, Jacob L; Schmidt, Justin O; Klotz, Stephen A

    2010-06-15

    Physicians in the United States should familiarize themselves with "kissing bugs" endemic to their area of practice and appreciate the medical implications of their bites. Bite victims often seek advice from physicians about allergic reactions as well as the risk of contracting Chagas disease. Physicians are generally knowledgeable about the role of kissing bugs in the transmission of Trypanosoma cruzi in Latin America. However, they may be unaware of (1) severe allergic reactions to kissing bug salivary antigens, (2) the widespread occurrence of T. cruzi amongst vertebrate hosts of kissing bugs, and (3) the incidence of T. cruzi among kissing bugs (T. cruzi may infect >50% of sampled bugs). Despite the potential for Chagas disease transmission, the major concern regarding kissing bugs in the United States is anaphylactic reactions to their bites resulting in frequent emergency department visits, especially in areas of endemicity in the Southwest.

  18. More than Just Language Advising: Rapport in University English Writing Consultations and Implications for Tutor Training

    Science.gov (United States)

    Lee, Cynthia

    2015-01-01

    Adopting a case study approach with multiple data sources, this paper explores the ways in which rapport is built, and its impact on the learning process based on five successive writing support consultations between a native English-speaking (NES) tutor and her second language (L2) tutee in a Hong Kong university. With reference to the prepared…

  19. An Evaluation of Pedagogical Tutorial Tactics for a Natural Language Tutoring System: A Reinforcement Learning Approach

    Science.gov (United States)

    Chi, Min; VanLehn, Kurt; Litman, Diane; Jordan, Pamela

    2011-01-01

    Pedagogical strategies are policies for a tutor to decide the next action when there are multiple actions available. When the content is controlled to be the same across experimental conditions, there has been little evidence that tutorial decisions have an impact on students' learning. In this paper, we applied Reinforcement Learning (RL) to…

  20. Detention Home Teens as Tutors: A Cooperative Cross-Age Tutoring Pilot Project

    Science.gov (United States)

    Lazerson, David B.

    2005-01-01

    Concerned professionals in the juvenile justice field frequently express concern for effective programs that help youth offenders successfully rejoin society. This mixed-method pilot study involved detention home teens functioning as tutors for special education students in a public school. Tutors were selected who, based on previous assessment as…

  1. Cross-Age Peer Tutoring in Physics: Tutors, Tutees, and Achievement in Electricity

    Science.gov (United States)

    Korner, Marianne; Hopf, Martin

    2015-01-01

    International comparisons reveal that lower-secondary-level students in Austria perform below the OECD mean in science. Guided by the search for remedies and improvements in science teaching, this study investigates whether cross-age peer tutoring is an appropriate method for teaching physics. A modern and concise definition of peer tutoring is…

  2. Cross-Age Peer Tutoring in Physics: Tutors, Tutees, and Achievement in Electricity

    Science.gov (United States)

    Korner, Marianne; Hopf, Martin

    2015-01-01

    International comparisons reveal that lower-secondary-level students in Austria perform below the OECD mean in science. Guided by the search for remedies and improvements in science teaching, this study investigates whether cross-age peer tutoring is an appropriate method for teaching physics. A modern and concise definition of peer tutoring is…

  3. Who Am I as a Distance Tutor? An Investigation of Distance Tutors' Professional Identity in China

    Science.gov (United States)

    Xiao, Junhong

    2016-01-01

    Much research has been conducted in the area of teacher professional identity in the past decades. Nonetheless, very little attention has been paid to the professional identity of tutors in distance education. Using interviews, this study set out to investigate distance tutors' claimed and assigned professional identities, their actual, ought and…

  4. Bed Bugs Appearance and Life Cycle

    Science.gov (United States)

    Identify these bugs accurately, from egg to nymph to adult. Adults are about the size of an apple seed, brown and oval-shaped, and either flat or balloon-like depending on how recently fed. Nymphs are a bit smaller and translucent or whitish yellow.

  5. Milkweed, stink bugs, and Georgia cotton

    Science.gov (United States)

    In peanut-cotton farmscapes in Georgia, stink bugs, i.e., Nezara viridula (L.)(Say) and Chinavia hilaris (Say), develop in peanut and then disperse at the crop-to-crop interface to feed on fruit in cotton. The main objective of this study was to examine the influence of a habitat of tropical milkwe...

  6. The impact of the invasive brown marmorated stink bug in North America and Europe: history, biology, ecology, and management

    Science.gov (United States)

    Brown marmorated stink bug (BMSB), Halyomorpha halys (Stål), is an invasive Pentatomidae introduced to the USA, Canada, and multiple European countries. In 2010, BMSB populations in the mid-Atlantic region USA reached outbreak levels, and subsequent feeding resulted in severe damage to tree fruit a...

  7. Supporting Early Childhood Educators' Use of Embedded Communication Strategies by Providing Feedback via Bug-in-Ear Technology

    Science.gov (United States)

    Riggie, Jennifer

    2013-01-01

    The purpose of this study was to examine the relationship between coaching provided with bug-in-ear technology, the frequency of the early childhood educators' use of targeted communication strategies and children's expressive communication. Four multiple-baseline single-case design experiments were completed to evaluate these relationships.…

  8. Mathematics Synchronous Peer Tutoring System for Students with Learning Disabilities

    National Research Council Canada - National Science Library

    Mengping Tsuei

    2014-01-01

      The purpose of this study was to develop and explore the impact of a synchronous peer tutoring system, which integrated a structured peer tutoring strategy with technological advances, for students...

  9. Interweaving Autonomous Learning and Peer-tutoring in Coaching EFL Student-Teachers

    Directory of Open Access Journals (Sweden)

    Ariza Ariza Aleida

    2009-11-01

    Full Text Available In this article we share the findings on the exploration of undergraduate efl (English as a Foreign Language student-teachers’ professional preparation and autonomous practices. Participants were tutees who attended tutorial sessions with peers in higher semesters. In this context, tutoring was based on a model we designed. As the model was implemented, they collected information by means of multiple qualitative research instruments. Results indicate that tutees’ learning process was strongly influenced by their personality and attitudes. Similarly, tutees expanded their views in regard to the English language, its learning, and their communicative competence. Finally, we pinpoint some considerations for others interested in adopting this pedagogical strategy. Key words: Peer tutoring, university tutoring, autonomous learning, independent work En este artículo compartimos hallazgos relacionados con la preparación profesional y las prácticas autónomas de estudiantes de inglés en un programa de licenciatura. Los participantes tutorados asistían a sesiones tutoriales con compañeros en semestres superiores. En este contexto, la tutoría se basó en un modelo que diseñamos. Durante la implementación del modelo se recogió información a través de múltiples instrumentos cualitativos de investigación. Los resultados revelan que el proceso de aprendizaje de los tutorados se vio fuertemente influenciado por su personalidad y sus actitudes. Asimismo, los tutorados ampliaron sus puntos de vista sobre la lengua inglesa, su aprendizaje y su competencia comunicativa. Finalmente, señalamos algunas consideraciones para los interesados en adoptar esta estrategia pedagógica Palabras clave: Tutoría entre compañeros, tutoría a nivel universitario, aprendizaje autónomo, trabajo independiente

  10. Instruction, Cognitive Scaffolding, and Motivational Scaffolding in Writing Center Tutoring

    Science.gov (United States)

    Mackiewicz, Jo; Thompson, Isabelle

    2014-01-01

    In this study, we quantitatively analyze the discourse of experienced writing center tutors in 10 highly satisfactory conferences. Specifically, we analyze tutors' instruction, cognitive scaffolding, and motivational scaffolding, all tutoring strategies identified in prior research from other disciplines as educationally effective. We find that…

  11. Developmental Process Model for the Java Intelligent Tutoring System

    Science.gov (United States)

    Sykes, Edward

    2007-01-01

    The Java Intelligent Tutoring System (JITS) was designed and developed to support the growing trend of Java programming around the world. JITS is an advanced web-based personalized tutoring system that is unique in several ways. Most programming Intelligent Tutoring Systems require the teacher to author problems with corresponding solutions. JITS,…

  12. Effectiveness of Intelligent Tutoring Systems: A Meta Analytic Review

    Science.gov (United States)

    2017-02-01

    Michigan J. D. Fletcher Institute for Defense Analyses This review describes a meta- analysis of findings from 50 controlled evaluations of intelligent ...requirements for the meta- analysis : six evaluations with nonconventional control groups and four with flawed implementations of intelligent tutoring...hour of intelligent tutoring; the longest provided intelligent tutoring for three semesters, or 48 weeks. Overall Effects For our primary analysis , we

  13. A Training Model for Peer Tutoring with Mentally Retarded Individuals.

    Science.gov (United States)

    Vacc, Nicholas

    A program in which mentally retarded persons are trained to tutor their peers is described. Considered are selection and training aspects of such a program, and emphasized is the importance of the relationship between tutor and student. Tutors are explained to learn principles of establishing specific plans and keeping basic records. (CL)

  14. International Students as Peer Tutors: Is It Lawful?

    Science.gov (United States)

    Leach-López, Maria A.

    2010-01-01

    Students enrolled in Principles of Accounting courses might require peer tutoring services. Accounting Departments (schools) can assist these students by maintaining a list of students offering tutoring services for a fee. The opportunity to be included in the list of tutors must be offered to all university students, both domestic and foreign.…

  15. Host preference of the chinch bug, Blissus occiduus

    OpenAIRE

    Eickhoff, Thomas E.; Baxendale, Frederick P; Heng-Moss, Tiffany M.

    2006-01-01

    The chinch bug, Blissus occiduus Barber (Hemiptera: Blissidae), is an important pest of buffalograss, Buchloë dactyloides (Nutall) Engelmann and potentially other turfgrass, crop, and non-crop hosts. Choice studies documented the number of B. occiduus present on selected turfgrasses, crops and weeds, and provided important insights into the host preferences of this chinch bug. Grasses with the most chinch bugs present included the warm-season turfgrasses B. dactyloides, zoysiagrass, Zoysia ja...

  16. Human Odorant Reception in the Common Bed Bug, Cimex lectularius

    OpenAIRE

    Feng Liu; Nannan Liu

    2015-01-01

    The common bed bug Cimex lectularius is a temporary ectoparasite on humans and currently resurgent in many developed countries. The ability of bed bugs to detect human odorants in the environment is critical for their host-seeking behavior. This study deciphered the chemical basis of host detection by investigating the neuronal response of olfactory sensilla to 104 human odorants using single sensillum recording and characterized the electro-physiological responses of bed bug odorant receptor...

  17. A sensor-based motion planner:Situated-Bug

    Institute of Scientific and Technical Information of China (English)

    居鹤华; 崔平远; 崔祜涛

    2003-01-01

    Propose a new sensor-based motion planning approach of Situated-Bug, which is composed of goal-oriented behavior, boundary following behavior and goal-oriented obstacle avoidance behavior, which are based on fuzzy control. The situated-Bug selects its behaviors according to robot orientation, instead of positions and hit points like other Bug algorithms, and its convergence proves robust to sensor noise, and it can guide the robots running for long rang traverse. At the same time, the design of the Situated-Bug is presented. Simulation results show that the approach is effective and practical.

  18. Stink Bug Feeding Induces Fluorescence in Developing Cotton Bolls

    Directory of Open Access Journals (Sweden)

    Toews Michael D

    2011-08-01

    Full Text Available Abstract Background Stink bugs (Hemiptera: Pentatomidae comprise a critically important insect pest complex affecting 12 major crops worldwide including cotton. In the US, stink bug damage to developing cotton bolls causes boll abscission, lint staining, reduced fiber quality, and reduced yields with estimated losses ranging from 10 to 60 million dollars annually. Unfortunately, scouting for stink bug damage in the field is laborious and excessively time consuming. To improve scouting accuracy and efficiency, we investigated fluorescence changes in cotton boll tissues as a result of stink bug feeding. Results Fluorescent imaging under long-wave ultraviolet light showed that stink bug-damaged lint, the inner carpal wall, and the outside of the boll emitted strong blue-green fluorescence in a circular region near the puncture wound, whereas undamaged tissue emissions occurred at different wavelengths; the much weaker emission of undamaged tissue was dominated by chlorophyll fluorescence. We further characterized the optimum emission and excitation spectra to distinguish between stink bug damaged bolls from undamaged bolls. Conclusions The observed characteristic fluorescence peaks associated with stink bug damage give rise to a fluorescence-based method to rapidly distinguish between undamaged and stink bug damaged cotton bolls. Based on the fluorescent fingerprint, we envision a fluorescence reflectance imaging or a fluorescence ratiometric device to assist pest management professionals with rapidly determining the extent of stink bug damage in a cotton field.

  19. Cimex lectularius ("Bed Bugs"): Recognition, Management, and Eradication.

    Science.gov (United States)

    McMenaman, Kathryn S; Gausche-Hill, Marianne

    2016-11-01

    Reports of bed bug infestations in major cities in the United States and abroad have been in the public press. Physicians and other clinicians who care for children need to be able to recognize bed bug bites and understand the social, psychological, and medical implications that this diagnosis will have on patients and their families. In this article, a case presentation serves to guide discussion regarding establishing the diagnosis, differential diagnosis, and the management of bed bug bites and their complications. Integrated pest management programs involving housing managers, residents, and professional pest exterminators provide both chemical and nonchemical solutions for eradication of bed bug infestations.

  20. Analysis of the Dynamics among Tutors in an After-School Tutoring Program in a Homeless Shelter for Families

    Science.gov (United States)

    MacGillivray, Laurie; Goode, Gretchen S.

    2016-01-01

    Researchers of after-school tutoring primarily focus on educational outcomes with little attention to the social dynamics of such programs. In our qualitative case study, we examined the nature of interactions among tutors in a tutoring program at a homeless shelter for families. Employing Bourdieu's concepts of "social capital" and…

  1. Analysis of the Dynamics among Tutors in an After-School Tutoring Program in a Homeless Shelter for Families

    Science.gov (United States)

    MacGillivray, Laurie; Goode, Gretchen S.

    2016-01-01

    Researchers of after-school tutoring primarily focus on educational outcomes with little attention to the social dynamics of such programs. In our qualitative case study, we examined the nature of interactions among tutors in a tutoring program at a homeless shelter for families. Employing Bourdieu's concepts of "social capital" and…

  2. Some Experiences with Two Intelligent Tutoring Systems for Teaching Computer Programming: PROUST and the LISP-Tutor

    NARCIS (Netherlands)

    van Merrienboer, J.; Maaswinkel, D.; van den Berg, Klaas; Pieters, J.M.

    1989-01-01

    In this article, we report on our experiences with PROUST and the LISP-Tutor, which are intelligent tutoring systems (ITS) for teaching introductory programming in respectively Pascal and LISP. After a brief discussion of the history of intelligent programming tutors, and the presentation of a

  3. Transcriptomics of the Bed Bug (Cimex lectularius)

    OpenAIRE

    Xiaodong Bai; Praveen Mamidala; Swapna P Rajarapu; Jones, Susan C.; Omprakash Mittapalli

    2011-01-01

    BACKGROUND: Bed bugs (Cimex lectularius) are blood-feeding insects poised to become one of the major pests in households throughout the United States. Resistance of C. lectularius to insecticides/pesticides is one factor thought to be involved in its sudden resurgence. Despite its high-impact status, scant knowledge exists at the genomic level for C. lectularius. Hence, we subjected the C. lectularius transcriptome to 454 pyrosequencing in order to identify potential genes involved in pestici...

  4. Diversity of Wolbachia Endosymbionts in Heteropteran Bugs

    OpenAIRE

    Kikuchi, Yoshitomo; Fukatsu, Takema

    2003-01-01

    An extensive survey of Wolbachia endosymbionts in Japanese terrestrial heteropteran bugs was performed by PCR detection with universal primers for wsp and ftsZ genes of Wolbachia, cloning of the PCR products, restriction fragment length polymorphism analysis of infecting Wolbachia types, and molecular phylogenetic characterization of all the detected Wolbachia strains. Of 134 heteropteran species from 19 families examined, Wolbachia infection was detected in 47 species from 13 families. From ...

  5. Bed Bug (Cimex lectularius L. Population Composition as Determined by Baited Traps

    Directory of Open Access Journals (Sweden)

    Elizabeth J. Schaafsma

    2012-04-01

    Full Text Available Two established field populations of bed bugs were sampled using host-mimicking traps baited with a combination of CO2, heat and a synthetic kairomone. The proportion of first instar nymphs (between 52% and 78% of all captured insects was significantly higher than reported in previous studies, which had employed different sampling methods. The proportion of adults was correspondingly much lower than previously reported, between 5% and 7% of total capture. As many as 120 bed bugs were captured in a single trap in one night; the variation in catches between sampling locations within the same room and between days at the same location indicates that multiple nights of trapping may be required to obtain an accurate representation of population structure.

  6. Research Methods Tutor: evaluation of a dialogue-based tutoring system in the classroom.

    Science.gov (United States)

    Arnott, Elizabeth; Hastings, Peter; Allbritton, David

    2008-08-01

    Research Methods Tutor (RMT) is a dialogue-based intelligent tutoring system for use in conjunction with undergraduate psychology research methods courses. RMT includes five topics that correspond to the curriculum of introductory research methods courses: ethics, variables, reliability, validity, and experimental design. We evaluated the effectiveness of the RMT system in the classroom using a nonequivalent control group design. Students in three classes (n = 83) used RMT, and students in two classes (n = 53) did not use RMT. Results indicated that the use of RMT yieldedstrong learning gains of 0.75 standard deviations above classroom instruction alone. Further, the dialogue-based tutoring condition of the system resulted in higher gains than did the textbook-style condition (CAI version) of the system. Future directions for RMT include the addition of new topics and tutoring elements.

  7. Pygmalion effects among outreach supervisors and tutors: extending sex generalizability.

    Science.gov (United States)

    Natanovich, Gloria; Eden, Dov

    2008-11-01

    Students who supervised other students who tutored grade-school pupils in a university-based outreach program were randomly assigned to Pygmalion and control conditions. Experimental supervisors were told that their tutors were ideally qualified for their tutoring role; control supervisors were told nothing about their tutors' qualifications. A manipulation check revealed that the experimental supervisors expected more of their tutors. Analysis of variance of tutorial success measures confirmed the Pygmalion effect among supervisors of both sexes. No main effect or interaction involving either supervisor sex or tutor sex was significant. As predicted, the experimental supervisors also provided better leadership and the experimental tutors increased their self-efficacy. This was the first demonstration of the Pygmalion effect among women leading men. Pygmalion effects may be produced without regard for sex.

  8. Challenges facing PBL tutors: 12 tips for successful group facilitation.

    Science.gov (United States)

    Azer, Samy A

    2005-12-01

    One of the main tasks of a problem-based learning (PBL) tutor is to facilitate group discussion. Group facilitation is about process rather than content. In this process, a tutor helps the group increase their skills and progress in their discussion. Several studies have highlighted strategies and training used in preparing PBL tutors. However, PBL tutors usually feel that it is not that easy to change their teaching style to the PBL format. They are sometimes unsure about their role or what strategy they might use to facilitate their students' discussion. This article in the '12 Tips' series is a detailed description of, and provides answers to, common challenges faced by PBL tutors. The tips provided in this manuscript should help tutors with practical answers. The article may be useful to PBL tutors, medical and health educators and those responsible for PBL training workshops.

  9. Protein Self-Marking by Ectoparasites: A Case Study Using Bed Bugs (Hemiptera: Cimicidae).

    Science.gov (United States)

    Sivakoff, Frances S; Jones, Susan C; Machtley, Scott A; Hagler, James R

    2016-11-01

    The ability to mark individuals is a critical feature of many entomological investigations, including dispersal studies. Insect dispersal is generally investigated using mark-release-recapture techniques, whereby marked individuals are released at a known location and then captured at a measured distance. Ectoparasite dispersal has historically been challenging to study, in part because of the ethical concerns associated with releasing marked individuals. Here, we introduce the protein self-marking technique, whereby ectoparasites mark themselves in the field by feeding on the blood of an introduced host. We demonstrate the potential of this technique using laboratory-reared bed bugs (Cimex lectularius L.) that marked themselves by feeding on either rabbit or chicken blood. We then used enzyme-linked immunosorbent assays to detect host-specific blood serum proteins in bed bugs. We assessed these protein markers' ability to 1) distinctively identify marked individuals, 2) persist following multiple feedings on an alternate diet, 3) persist over time across a range of temperatures, and 4) transfer from marked to unmarked individuals. Protein markers were detectable in bed bugs before and after molting, remained detectible after multiple feedings on an alternate diet, persisted regardless of whether an individual was starved or fed on an alternate diet following original mark acquisition, and did not transfer between individuals. The duration of detectability depended on temperature. Our results suggest that protein self-marking is an effective technique for marking bed bugs and holds promise for use in dispersal studies of ectoparasitic insects. © The Authors 2016. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For Permissions, please email: journals.permissions@oup.com.

  10. An Intelligent Tutoring System for Conceptual Physics

    Science.gov (United States)

    Franceschetti, Donald R.

    2007-11-01

    AutoTutor is an intelligent tutoring system (ITS) in which students can learn a variety of subjects through conversation in natural language with a software agent. The agent appears as a face on the screen, with a synthesized voice, and responds to typed input from the student. Student understanding is modeled from student responses, which are matched to high quality essay responses and known misconceptions and bad answers using one of several computational linguistic techniques. With ONR and NSF support a version of AutoTutor covering Newtonian dynamics at the level of Hewitt's Conceptual Physics has been developed and extensively tested. As a byproduct of this work, several thousand student responses to a small number of conceptual physics questions have been collated and mined for misconceptions. Recent work has allowed a comparison of latent semantic analysis and inverse word frequency measures of text match with expert answers. Some results from this process will be presented along with a demonstration of AutoTutor-Physics at work.

  11. Professionalizing tutors and tutorials in higher education

    Directory of Open Access Journals (Sweden)

    Colunga, Silvia

    2012-01-01

    Full Text Available The paper analyzes the necessity of professionalizing training of university teachers performing tutorial activities in higher education as a response to the demands of pupils following a part-time model. Permanent training of tutor is emphasized as a way to enhance professional and personal accomplishments. This training gives priority to educative orientation and interventional actions.

  12. Intelligent tutoring agent for settlers of Catan

    NARCIS (Netherlands)

    Geuze, Jeroen; Broek, van den Egon L.; Schobbens, P.-Y.; Vanhoof, W.; Schwanen, G.

    2006-01-01

    An Intelligent Tutoring Agent (ITA) for the board game Settlers of Catan (SoC) is introduced. It uses CLIPS knowledge bases, connected by JCLIPS to a JAVA implementation of SoC. It is founded on a new theoretical framework that describes the development of negotiation skills in children. Using this

  13. Evaluation Methods for Intelligent Tutoring Systems Revisited

    Science.gov (United States)

    Greer, Jim; Mark, Mary

    2016-01-01

    The 1993 paper in "IJAIED" on evaluation methods for Intelligent Tutoring Systems (ITS) still holds up well today. Basic evaluation techniques described in that paper remain in use. Approaches such as kappa scores, simulated learners and learning curves are refinements on past evaluation techniques. New approaches have also arisen, in…

  14. Does Artificial Tutoring Foster Inquiry Based Learning?

    Science.gov (United States)

    Schmoelz, Alexander; Swertz, Christian; Forstner, Alexandra; Barberi, Alessandro

    2014-01-01

    This contribution looks at the Intelligent Tutoring Interface for Technology Enhanced Learning, which integrates multistage-learning and inquiry-based learning in an adaptive e-learning system. Based on a common pedagogical ontology, adaptive e-learning systems can be enabled to recommend learning objects and activities, which follow inquiry-based…

  15. Improving the Efficiency of Dialogue in Tutoring

    Science.gov (United States)

    Kopp, Kristopher J.; Britt, M. Anne; Millis, Keith; Graesser, Arthur C.

    2012-01-01

    The current studies investigated the efficient use of dialogue in intelligent tutoring systems that use natural language interaction. Such dialogues can be relatively time-consuming. This work addresses the question of how much dialogue is needed to produce significant learning gains. In Experiment 1, a full dialogue condition and a read-only…

  16. A Review of BioTutor.

    Science.gov (United States)

    Duhrkopf, Richard

    1994-01-01

    A review of BioTutor which is software to accompany the third edition of Neil Campbell's textbook, "Biology," is provided. The review includes a brief description of the software and a discussion of good and bad features of the software. In the closing words, the reviewer expresses a considerable amount of concern regarding the quality of this…

  17. Learning Software Component Model for Online Tutoring

    Directory of Open Access Journals (Sweden)

    K. Duraiswamy

    2012-01-01

    Full Text Available Problem statement: Web services are interface elements which allow applications to render functional services to requesting clients using open standard protocols. A lecture method combines both social association and urban processing as course design and delivery is termed as Interface Learning. Many Interface learning services is presenting through online. To make an online tutoring scheme more effective, the previous study used web services and application programs like instant messaging based on environments in which students reside. But the downside is that it is difficult to maintain the service request queues online. The services and data storage processes are inefficient. Approach: To overcome all the above issues, a Learning Software Component Model (LSCM framework is formed in the present study to build a component model based on communication services available on the network. In addition to this, the proposed software component modeled with Learning Object (LO aspects integrates the related sub hierarchical components with the main component object framework. Based on LSCM, training schedules are identified efficiently. Results: The proposed LSCM framework is experimented to show the performance improvement with the previous online tutoring scheme based on web services in terms of delivery report, maintenance of tutoring sessions and reliability. Conclusion: Compared to an existing online tutoring through web services, the proposed LSCM framework performance is 75% better in providing learning services to the providers.

  18. Cross-Age Peer Tutors in Asynchronous Discussion Groups: Exploring the Impact of Three Types of Tutor Training on Patterns in Tutor Support and on Tutor Characteristics

    Science.gov (United States)

    De Smet, Marijke; Van Keer, Hilde; De Wever, Bram; Valcke, Martin

    2010-01-01

    This study was conducted in an authentic university setting with fourth-year Educational Sciences' students operating as online peer tutors to facilitate freshman tutees' online collaboration and knowledge construction in a blended "Instructional Sciences" course. Taking into account prior research uncovering weaknesses in online peer tutor…

  19. Bed Bug Epidemic: A Challenge to Public Health

    Science.gov (United States)

    Ratnapradipa, Dhitinut; Ritzel, Dale O.; Haramis, Linn D.; Bliss, Kadi R.

    2011-01-01

    In recent years, reported cases of bed bug infestations in the U.S. and throughout the world have escalated dramatically, posing a global public health problem. Although bed bugs are not known to transmit disease to humans, they pose both direct and indirect public health challenges in terms of health effects, treatment, cost, and resource…

  20. Behavioral responses of the bed bug to insecticide residues.

    Science.gov (United States)

    Romero, Alvaro; Potter, Michael F; Haynes, Kenneth F

    2009-01-01

    The recent resurgence of bed bugs, Cimex lectularius L. (Heteroptera: Cimicidae), has increased the demand for information about effective control tactics. Several studies have focused on determining the susceptibility of bed bug populations to insecticides. However, behavioral responses of bed bugs to insecticide residues could influence their efficacy. The behavioral responses of bed bugs to deltamethrin and chlorfenapyr, two commonly used insecticides for bed bug control in the United States, were evaluated. In two-choice tests, grouped insects and individual insects avoided resting on filter paper treated with deltamethrin. Insects did not avoid surfaces treated with chlorfenapyr. Harborages, containing feces and eggs and treated with a deltamethrin-based product, remained attractive to individuals from a strain resistant to pyrethroids. Video recordings of bed bugs indicated that insects increased activity when they contacted sublethal doses of deltamethrin. Insecticide barriers of chlorfenapyr or deltamethrin did not prevent bed bugs from reaching a warmed blood source and acquiring blood meals. We discuss the impact of these responses on bed bug control practices.

  1. An automated approach for finding variable-constant pairing bugs

    DEFF Research Database (Denmark)

    Lawall, Julia; Lo, David

    2010-01-01

    program-analysis and data-mining based approach to identify the uses of named constants and to identify anomalies in these uses.  We have applied our approach to a recent version of the Linux kernel and have found a number of bugs affecting both correctness and software maintenance.  Many of these bugs...... have been validated by the Linux developers....

  2. Competition: Butterflies eliminate milkweed bugs from a Caribbean Island.

    Science.gov (United States)

    Blakley, Nigel R; Dingle, Hugh

    1978-01-01

    By eliminating the food plant, Asclepias curassavica, monarch butterflies, Danaus plexippus, have virtually eliminated milkweed bugs, Oncopeltus spp., from the island of Barbados. The relatively open terrain of Barbados means the plants have no refuge; the butterflies survive on an alternate milkweed food plant, Calotropis procera, whose thick-walled pods make seeds unavailable to the bugs.

  3. Catching the Bug: How Virtual Coaching Improves Teaching

    Science.gov (United States)

    Allen, Megan

    2014-01-01

    In this article the author describes virtual coaching and why it is so effective. The following six points of virtual coaching are explained: (1) Also known as bug-in-ear coaching, virtual coaching is not new; (2) Virtual coaching can save money and time; (3) Bug-in-ear coaching increases the frequency of observations for novice teachers; (4) It…

  4. Essential oils as fumigants for bed bugs (Hemiptera: Cimicidae)

    Science.gov (United States)

    In Petri dish assays, fumigation of a pyrethroid-susceptible strain of bed bugs Cimex lectularius L. (Hemiptera: Cimicidae) with various essential oils resulted in mortality that approached or equaled 100%, after 5 days. However, when bed bugs were exposed to the same essential oils in sealed, comme...

  5. Repellency of selected chemicals against the bed bug, (hemiptra: Cimicidae)

    Science.gov (United States)

    In recent years, the common bed bug, Cimex lectularius L. (Hemiptera: Cimicidae), became a major public health concern in urban communities. Bed bugs are notoriously difficult to control and their painful bites are not tolerated by most people. The public has a strong need for materials and methods ...

  6. Studies towards the sex pheromone of the green capsid bug

    NARCIS (Netherlands)

    Drijfhout, F.P.

    2001-01-01

    The green capsid bug, Lygocoris pabulinus (L.) (Heteroptera: Miridae) is a serious pest in fruit orchards, which is difficult to control. Because it is difficult to determine the actual population density, fruit growers apply insecticides against the green capsid bug on

  7. Towards Easing the Diagnosis of Bugs in OS Code

    DEFF Research Database (Denmark)

    Stuart, Henrik; Hansen, René Rydhof; Lawall, Julia Laetitia;

    2007-01-01

    The rapid detection and treatment of bugs in operating systems code is essential to maintain the overall security and dependability of a computing system.  A number of techniques have been proposed for detecting bugs, but little has been done to help developers analyze and treat them.  In this pa...

  8. Print a Bed Bug Card - (Page of Cards)

    Science.gov (United States)

    For mass distribution: two sets of business-card-sized lists of tips for recognizing bed bugs and signs of an infestation, including a photo of bed bugs to assist identification. One card is for general use around home or office, the other for travelers.

  9. Peer Tutors in the School of Medicine

    Directory of Open Access Journals (Sweden)

    Delgado Vegap

    2006-10-01

    Full Text Available Since 2003 the School of Medicine at theUniversidad del Rosario in Bogotá, Colombia,offers to the students a program named PeerTutors. The program’s objectives are: to generatea social interaction mechanism that favorsknowledge construction side by side withadvanced peers; to promote the development ofRecibido:Aceptado:* M.D., MSc (est.. Profesor Asistente de Cirugía. Coordinadordel Grupo de Investigación en Educación Médica.Universidad del Rosario. anisaza@urosario.edu.co** M.D. Coordinador de Tutores Pares, I semestre de2003. Universidad del Rosario.+ M.D. Coordinadora de Tutores Pares, II semestre de2003. Universidad del Rosario.+ M.D. Coordinadora de Tutores Pares, 2004. Universidaddel Rosario.§ M.D. Coordinadora de Tutores Pares, I semestre de2005. Universidad del RosarioDescargos de responsabilidad: Las ideas expuestasen el presente artículo son responsabilidad exclusivade los autores y no comprometen a ninguna institución.Disclaimer: the ideas expressed in this article areexclusively the author’s responsibility and do notcompromise any institution.Artículo originalethical, moral and coexistence oriented valuesthrough an academic experience, and to generatea space to explore specific academic interests andteacher´s potential. This article presents thetheoretic frame that supports the importance ofsocial interaction in knowledge construction, aswell as some indicators that allow a first appraisalof the program. Several achievements thataccount for the synergic value of an experiencethat not only fulfills the function of initiating aprocess of teaching formation and academicsupport, but that also builds a proactive attitudebefore learning, are highlighted.

  10. Susceptibilities of Tarnished Plant Bug and Stink Bug Nymphs to Various Insecticides

    Science.gov (United States)

    Laboratory experiments were conducted to examine the susceptibility of the nymphal stages and adult stage of the tarnished plant bug to a pyrethroid (permethrin), organophasphate (methamidophos), and neonicotinoid (thiamethoxam) insecticide. The susceptibilities of 5th instar and adult stages of th...

  11. Effects of School Counselor Supervised Peer Tutoring in Inclusive Settings on Meeting IEP Outcomes of Students with Developmental Disabilities

    Science.gov (United States)

    Odluyurt, Serhat; Tekin-Iftar, Elif; Ersoy, Gulhan

    2014-01-01

    The purpose of this study was to investigate the effects of school counselor supervised peer tutoring intervention on meeting IEP outcomes of six inclusion students with developmental disabilities in a public elementary and secondary school. The effectiveness of this intervention was evaluated by using multiple probe design across students.…

  12. Providing Formative Assessment to Students Solving Multipath Engineering Problems with Complex Arrangements of Interacting Parts: An Intelligent Tutor Approach

    Science.gov (United States)

    Steif, Paul S.; Fu, Luoting; Kara, Levent Burak

    2016-01-01

    Problems faced by engineering students involve multiple pathways to solution. Students rarely receive effective formative feedback on handwritten homework. This paper examines the potential for computer-based formative assessment of student solutions to multipath engineering problems. In particular, an intelligent tutor approach is adopted and…

  13. The Relative Effects of Classwide Peer Tutoring and Peer Coaching on the Positive Social Behaviors of Children with ADHD

    Science.gov (United States)

    Plumer, Pamela J.; Stoner, Gary

    2005-01-01

    This study investigates the effects of Classwide Peer Tutoring (CWPT) and peer coaching on the peer social behaviors of children with ADHD. A single-subject, multiple-baseline design is used with three elementary-school students in Grades 3 and 4. Following a baseline period, CWPT is implemented in each student's classroom. During the second…

  14. Artificial intelligence and tutoring systems computational and cognitive approaches to the communication of knowledge

    CERN Document Server

    Wenger, Etienne

    2014-01-01

    Artificial Intelligence and Tutoring Systems: Computational and Cognitive Approaches to the Communication of Knowledge focuses on the cognitive approaches, methodologies, principles, and concepts involved in the communication of knowledge. The publication first elaborates on knowledge communication systems, basic issues, and tutorial dialogues. Concerns cover natural reasoning and tutorial dialogues, shift from local strategies to multiple mental models, domain knowledge, pedagogical knowledge, implicit versus explicit encoding of knowledge, knowledge communication, and practical and theoretic

  15. Is peer tutoring beneficial in the context of school resuscitation training?

    Science.gov (United States)

    Lester, C; Donnelly, P; Weston, C

    1997-09-01

    First year pupils at a Cardiff comprehensive school were trained in cardiopulmonary resuscitation, 106 by the teacher only and 137 by the teacher assisted by older pupils (peer tutoring). Scores in a multiple choice theory test and in practical skill assessment showed no significant difference between instruction methods, but boys taught by the teacher assisted by older pupils expressed less willingness to resuscitate in an emergency than girls instructed by either method (P novice trainees (P < 0.025).

  16. PC Tutor. Bericht uber ein PC-gestutzes Tutorensystem = PC Tutor. Report on a Tutoring System with Personal Computer. ZIFF Papiere 75.

    Science.gov (United States)

    Fritsch, Helmut

    A project was conducted to increase as well as to professionalize communication between tutors and learners in a West German university's distance education program by the use of personal computers. Two tutors worked on the systematic development of a PC-based correcting system. The goal, apart from developing general language skills in English,…

  17. Peer Tutoring: Developing Writing in College Education

    Directory of Open Access Journals (Sweden)

    LUIS BERNARDO PEÑA-BORRERO

    2010-03-01

    Full Text Available This article presents partial results of a qualitative research on the Project of Inquiry (PRIN that takes place in the Psychology Degree Program at Javeriana University. This project is a formative experience focused on the importance of learning investigative abilities, through academic writing. The research was based on peer-tutoring interactions with 85 ethnographic records, which were subjected to an open and axial codification, in accordance to guidelines developed by Strauss and Corbin. The recordswere organized in emerging categories for their interpretation, in order to establish the potential significance of the pedagogic interaction. The results established the advantages of peer-tutoring in the integral progress of students and specifically the promotion of reading and writing abilities at a College level.

  18. Towards an Intelligent Tutor for Mathematical Proofs

    CERN Document Server

    Autexier, Serge; Schiller, Marvin; 10.4204/EPTCS.79.1

    2012-01-01

    Computer-supported learning is an increasingly important form of study since it allows for independent learning and individualized instruction. In this paper, we discuss a novel approach to developing an intelligent tutoring system for teaching textbook-style mathematical proofs. We characterize the particularities of the domain and discuss common ITS design models. Our approach is motivated by phenomena found in a corpus of tutorial dialogs that were collected in a Wizard-of-Oz experiment. We show how an intelligent tutor for textbook-style mathematical proofs can be built on top of an adapted assertion-level proof assistant by reusing representations and proof search strategies originally developed for automated and interactive theorem proving. The resulting prototype was successfully evaluated on a corpus of tutorial dialogs and yields good results.

  19. Towards an Intelligent Tutor for Mathematical Proofs

    Directory of Open Access Journals (Sweden)

    Serge Autexier

    2012-02-01

    Full Text Available Computer-supported learning is an increasingly important form of study since it allows for independent learning and individualized instruction. In this paper, we discuss a novel approach to developing an intelligent tutoring system for teaching textbook-style mathematical proofs. We characterize the particularities of the domain and discuss common ITS design models. Our approach is motivated by phenomena found in a corpus of tutorial dialogs that were collected in a Wizard-of-Oz experiment. We show how an intelligent tutor for textbook-style mathematical proofs can be built on top of an adapted assertion-level proof assistant by reusing representations and proof search strategies originally developed for automated and interactive theorem proving. The resulting prototype was successfully evaluated on a corpus of tutorial dialogs and yields good results.

  20. Case-Based Tutoring with Concept Maps

    OpenAIRE

    Sørmo, Frode

    2007-01-01

    The goal of this thesis is to investigate methods for computerized tutoring support that is adapted to the individual student. In particular, we are concerned with providing such assistance to students solving exercises in domains where a complete or accurate problem-solving model is infeasible. We propose to do this by using concept maps as a means for students to model their own knowledge. Combined with results from earlier exercises, the concept map can form a student model that can be use...

  1. Intelligent tutoring agent for settlers of Catan

    OpenAIRE

    2006-01-01

    An Intelligent Tutoring Agent (ITA) for the board game Settlers of Catan (SoC) is introduced. It uses CLIPS knowledge bases, connected by JCLIPS to a JAVA implementation of SoC. It is founded on a new theoretical framework that describes the development of negotiation skills in children. Using this framework, the ITA helps children in developing negotiation skills through play, which makes it unique in its kind.

  2. Learning Software Component Model for Online Tutoring

    OpenAIRE

    Duraiswamy, K.; Balakrishnan, M.

    2012-01-01

    Problem statement: Web services are interface elements which allow applications to render functional services to requesting clients using open standard protocols. A lecture method combines both social association and urban processing as course design and delivery is termed as Interface Learning. Many Interface learning services is presenting through online. To make an online tutoring scheme more effective, the previous study used web services and application programs like instant messaging ba...

  3. EDs trying not to let the bed bugs bite.

    Science.gov (United States)

    2010-09-01

    As bed bugs have emerged as a growing problem for EDs, managers have developed strategies for prevention and decontamination. Here are some of the approaches they have shared with ED Management: Educate your staff on what they should look for on patients and in rooms that would indicate the presence of bed bugs. Be proactive. Have an exterminator examine your ED on a regular basis. A decontamination room on the outside of the building will prevent the spread of these bugs in your ED.

  4. EarthTutor: An Interactive Intelligent Tutoring System for Remote Sensing

    Science.gov (United States)

    Bell, A. M.; Parton, K.; Smith, E.

    2005-12-01

    Earth science classes in colleges and high schools use a variety of satellite image processing software to teach earth science and remote sensing principles. However, current tutorials for image processing software are often paper-based or lecture-based and do not take advantage of the full potential of the computer context to teach, immerse, and stimulate students. We present EarthTutor, an adaptive, interactive Intelligent Tutoring System (ITS) being built for NASA (National Aeronautics and Space Administration) that is integrated directly with an image processing application. The system aims to foster the use of satellite imagery in classrooms and encourage inquiry-based, hands-on earth science scientific study by providing students with an engaging imagery analysis learning environment. EarthTutor's software is available as a plug-in to ImageJ, a free image processing system developed by the NIH (National Institute of Health). Since it is written in Java, it can be run on almost any platform and also as an applet from the Web. Labs developed for EarthTutor combine lesson content (such as HTML web pages) with interactive activities and questions. In each lab the student learns to measure, calibrate, color, slice, plot and otherwise process and analyze earth science imagery. During the activities, EarthTutor monitors students closely as they work, which allows it to provide immediate feedback that is customized to a particular student's needs. As the student moves through the labs, EarthTutor assesses the student, and tailors the presentation of the content to a student's demonstrated skill level. EarthTutor's adaptive approach is based on emerging Artificial Intelligence (AI) research. Bayesian networks are employed to model a student's proficiency with different earth science and image processing concepts. Agent behaviors are used to track the student's progress through activities and provide guidance when a student encounters difficulty. Through individual

  5. The influence of tutor training for peer tutors in the dissection course on the learning behavior of students.

    Science.gov (United States)

    Shiozawa, T; Hirt, B; Lammerding-Koeppel, M

    2016-11-01

    Student tutors in the dissection course are expected to meet high demands in their job, to fulfill these expectations they receive training. Combined tutor training is well accepted by tutors and tutees, however, it is not known how tutor training influences student learning. Deduced from the learning goals of the tutor training, a randomized, controlled, single-blinded study was set up with a quantitative cross-sectional analysis to compare student learning behavior. A total of 197 medical students, coached either by ten trained or ten untrained tutors, were enlisted in the study. To assess the students' learning behavior we employed the LIST questionnaire. A common factor analysis was calculated to extract dimensions. Factor scores of the extracted dimensions were calculated for both groups to estimate differences in learning behavior. Factor analysis of the LIST questionnaire revealed eight factors explaining 47.57% of the overall variance. The eight factors comprise: deep learning, attention, learning organization, cooperative learning, time management, learning effort, superficial learning and learning environment. Comparing the factor scores of the extracted dimensions, students coached by trained tutors learned significantly more with their fellow students (factor score in cooperative learning 0.194 vs. -0.205, ptrained by untrained tutors. Students coached by trained tutors also tend to be better organized in their learning (factor score in learning organization 0.115 vs. -0.122, p=0.16). The learning behavior of students coached by trained tutors differs from the learning behavior of students coached by untrained tutors. Students coached by trained tutors learn significantly more often in teams than their colleagues and are better organized. Copyright © 2016 Elsevier GmbH. All rights reserved.

  6. Studies of Resurgent Bed Bugs: Population Genetic Structure, Impact of Aggregation on Development and Molecular Screening for Bartonella

    Science.gov (United States)

    Saenz, Virna Lisa

    The recent resurgence of bed bugs (Cimex lectularius L.) has created an unprecedented demand for research on its biology. The main objectives of this dissertation research were to investigate several aspects of bed bug biology: infestation and dispersal dynamics at a large and small geographical scale using molecular markers, to determine the impact of aggregation on bed bug development and to screen bed bug populations for a re-emergent pathogen. First, we studied the infestation and dispersal dynamics of bed bugs at large geographical scale (e.g., across cities, states). Although bed bug infestations are on the rise, there is a poor understanding of their dispersal patterns and sources of infestation. We conducted a genetic study of 21 bed bug infestations from the eastern United States. We genotyped samples comprised of 8 - 10 individuals per infestation at nine polymorphic microsatellite loci. Despite high genetic diversity across all infestations, with 5 -- 17 alleles per locus (mean = 10.3), we found low genetic diversity (1 -- 4 alleles per locus) within all but one of the infestations. These results suggest that nearly all the studied infestations were started by a small propagule possibly consisting of a singly mated female and/or her progeny. All infestations were strongly genetically differentiated from each other (mean pairwise FST between populations = 0.68) and we did not find strong evidence of a geographic pattern of structuring. The high level of genetic diversity across infestations from the eastern United States together with the lack of geographically organized structure is consistent with multiple introductions into the United States from foreign sources. This work is described in Chapter 2 and was published in the Journal of Medical Entomology in 2012. Second, we investigated dispersal and infestation dynamics of bed bugs at a fine geographical scale within three multistory apartment buildings: one from Raleigh, NC and two from Jersey City, NJ

  7. The Effects of ExcelTutor Software Desing an Intelligent Tutoring Sysytem on Learning

    OpenAIRE

    2007-01-01

    The purpose of this study is to examine the effects of ExcelTUTOR drill software on achievement of students, which was design as computer based intelligent tutoring system, developed by the researcher. In this study, pretest- post test with control group, which is one of the experimental research designs, was used. The experimental and control groups of the study were composed of 20 students for each group, totally 40 students who went to Gazi University, Kırşehir Faculty of Education, Social...

  8. Bug bites and stings: When to see a dermatologist

    Medline Plus

    Full Text Available ... following tips: Use insect repellent. To protect against mosquitoes, ticks and other bugs, use insect repellent that ... great outdoors, use bed nets to protect against mosquitoes. Look for one that has been pre-treated ...

  9. Bug bites and stings: When to see a dermatologist

    Medline Plus

    Full Text Available ... care Younger skin Kids’ zone About skin: Your body's largest organ About hair: Not just on your ... bug bite, such as a rash, fever, or body aches, see your doctor or a board-certified ...

  10. Bug bites and stings: When to see a dermatologist

    Medline Plus

    Full Text Available ... plans and activities Video library Find a dermatologist Home Public and patients Skin, hair, and nail care ... bites and stings can be safely treated at home. To treat bug bites and stings at home, ...

  11. Bug bites and stings: When to see a dermatologist

    Medline Plus

    Full Text Available ... MOC webinars and videos FAQs MOC resources Recognized Credit Basic Derm Curriculum Teaching and learning guides Suggested ... it’s important to take steps to reduce your risk. To help prevent bug bites, dermatologists recommend the ...

  12. BUGS at work : a bicycle user group guide

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2002-07-01

    This guide provides practical advice to cyclists on how start a Bicycle User Group (BUG) at their workplace. It offers tools to encourage employers to be proactive in improving facilities in support of cycle commuting. Several BUGs across Canada have worked towards getting better bicycle parking, lockers and shower facilities at their workplace. Other incentives include policies such as flexible work hours for cyclist commuters; casual dress on Friday; reimbursement for the subsidized cost of free parking provided by employers; and, use of a company car if needed for company business during the work day. The advantages to employers include: reduced health care costs because cyclists are physically fit; decreased absenteeism; increased productivity; reduced parking costs; lower company transportation bills; and, a greener corporate image. BUGs provide cycling information ranging from cycling maps to pamphlets and they raise cycle awareness. This guide includes cycling survey samples and examples of successful BUG activities across Canada. refs., tabs., figs.

  13. How Does the Degree of Variability Affect Bug-Finding?

    DEFF Research Database (Denmark)

    Melo, Jean; Brabrand, Claus; Wasowski, Andrzej

    2016-01-01

    place. The difficulty in reasoning about several configurations is a likely reason why the variability bugs are actually introduced in configurable programs. We hope that the detailed findings presented here will inspire the creation of programmer support tools addressing the challenges faced......Software projects embrace variability to increase adaptability and to lower cost; however, others blame variability for increasing complexity and making reasoning about programs more difficult. We carry out a controlled experiment to quantify the impact of variability on debugging of preprocessor......-based programs. We measure speed and precision for bug finding tasks defined at three different degrees of variability on several subject programs derived from real systems. The results show that the speed of bug finding decreases linearly with the number of features, while effectiveness of finding bugs...

  14. Bug bites and stings: When to see a dermatologist

    Medline Plus

    Full Text Available ... MD, Memorial Award and Lectureship Grants from outside organizations Health Volunteers Overseas Grant Honorary International Society Annual ... an ice pack to the bite. If you experience any serious symptoms after a bug bite, such ...

  15. Protecting Yourself from Bed Bugs in Public Places

    Science.gov (United States)

    Infestations in non-residential areas are rare, but may still present opportunities for hitchhiking bugs. So reduce clutter, stow belongings separately, monitor or inspect upholstered furniture, educate staff, and keep integrated pest management in mind.

  16. Stay Legal and Safe in Treating for Bed Bugs

    Science.gov (United States)

    Quick fix solutions may sound appealing, but they may not be legal, safe, or effective. To avoid adverse effects such as poisoning, buy EPA-registered pesticides labeled for bed bug control, and follow all label directions and precautions.

  17. Bed Bug Clearinghouse -- Publications of General Interest (to all audiences)

    Science.gov (United States)

    This information is intended to help states, communities, and consumers prevent and control bed bug infestations. These resources include prevention tips, how to identify nymphs and adults, heat treatment, safe pesticide use, and some Spanish translations.

  18. Test Guideline Methods for Bed Bug Pesticide Products Now Available

    Science.gov (United States)

    EPA’s final test guidelines, 810.3900 - Laboratory Product Performance Testing Methods for Bed Bug Pesticide Products, provides recommendations for the design and execution of laboratory studies to evaluate the performance of pesticide products.

  19. Bed bugs evolved unique adaptive strategy to resist pyrethroid insecticides.

    Science.gov (United States)

    Zhu, Fang; Gujar, Hemant; Gordon, Jennifer R; Haynes, Kenneth F; Potter, Michael F; Palli, Subba R

    2013-01-01

    Recent advances in genomic and post-genomic technologies have facilitated a genome-wide analysis of the insecticide resistance-associated genes in insects. Through bed bug, Cimex lectularius transcriptome analysis, we identified 14 molecular markers associated with pyrethroid resistance. Our studies revealed that most of the resistance-associated genes functioning in diverse mechanisms are expressed in the epidermal layer of the integument, which could prevent or slow down the toxin from reaching the target sites on nerve cells, where an additional layer of resistance (kdr) is possible. This strategy evolved in bed bugs is based on their unique morphological, physiological and behavioral characteristics and has not been reported in any other insect species. RNA interference-aided knockdown of resistance associated genes showed the relative contribution of each mechanism towards overall resistance development. Understanding the complexity of adaptive strategies employed by bed bugs will help in designing the most effective and sustainable bed bug control methods.

  20. Bug bites and stings: When to see a dermatologist

    Medline Plus

    Full Text Available ... bites Although most bug bites are harmless, some can spread dangerous diseases like Zika virus, dengue, Lyme ... and tuck your shirt into your pants. You can also pre-treat outer layers of clothing with ...

  1. Bug bites and stings: When to see a dermatologist

    Medline Plus

    Full Text Available ... Part 1: Structure Part 2: Origin Part 3: Function Textbook Study notes Image library 3-D animated ... nail care Injured skin Bug bites and stings "); (function () { var a = "", b = [ "adid=aad-aad-1", "site= ...

  2. Bug bites and stings: When to see a dermatologist

    Medline Plus

    Full Text Available ... order of modules Video library Quiz library Basement Membrane Zone lecture Full lecture Part 1: Structure Part ... Skin care Hair care / hair loss Injured skin Blisters Bug bites and stings How to remove a ...

  3. American Trypanosomiasis (Also Known as Chagas Disease) Triatomine Bug FAQs

    Science.gov (United States)

    ... the blood of mammals (including humans), birds, and reptiles. Triatomine bugs live in a wide range of environmental settings, generally within close proximity to a blood host. In areas of Latin America where human Chagas disease is an important public ...

  4. What Do Distance Language Tutors Say about Teacher Motivation?

    Science.gov (United States)

    Xiao, Junhong

    2014-01-01

    Research into motivation in education mainly centres on students' learning motivation. This article reports on an interview study of teacher motivation with the aim of investigating the effects of student-related factors and tutors' personal factors on the motivation of language tutors in the distance learning context. Findings from the study…

  5. Corruption Risks of Private Tutoring: Case of Georgia

    Science.gov (United States)

    Kobakhidze, Magda Nutsa

    2014-01-01

    The paper focuses on teacher-supplied private tutoring in the context of post-Soviet Georgia, and elucidates the ways in which teacher-supplied private tutoring can be related to educational corruption. The paper draws on data from in-depth interviews of 18 school teachers in different parts of Georgia in 2013. The findings of the qualitative…

  6. Effectiveness of Intelligent Tutoring Systems: A Meta-Analytic Review

    Science.gov (United States)

    Kulik, James A.; Fletcher, J. D.

    2016-01-01

    This review describes a meta-analysis of findings from 50 controlled evaluations of intelligent computer tutoring systems. The median effect of intelligent tutoring in the 50 evaluations was to raise test scores 0.66 standard deviations over conventional levels, or from the 50th to the 75th percentile. However, the amount of improvement found in…

  7. What Do Distance Language Tutors Say about Teacher Motivation?

    Science.gov (United States)

    Xiao, Junhong

    2014-01-01

    Research into motivation in education mainly centres on students' learning motivation. This article reports on an interview study of teacher motivation with the aim of investigating the effects of student-related factors and tutors' personal factors on the motivation of language tutors in the distance learning context. Findings from the…

  8. Household Expenditures on Private Tutoring: Emerging Evidence from Malaysia

    Science.gov (United States)

    Kenayathulla, Husaina Banu

    2013-01-01

    Private tutoring has been a burgeoning phenomenon in Malaysia for decades. This study examines the determinants of private tutoring expenditures in Malaysia using the 2004/2005 Household Expenditures Survey and applies hurdle regression models to the data. The results indicate that total household expenditures, household head's level of…

  9. Corruption Risks of Private Tutoring: Case of Georgia

    Science.gov (United States)

    Kobakhidze, Magda Nutsa

    2014-01-01

    The paper focuses on teacher-supplied private tutoring in the context of post-Soviet Georgia, and elucidates the ways in which teacher-supplied private tutoring can be related to educational corruption. The paper draws on data from in-depth interviews of 18 school teachers in different parts of Georgia in 2013. The findings of the qualitative…

  10. Stepwise Advice Negotiation in Writing Center Peer Tutoring

    Science.gov (United States)

    Park, Innhwa

    2014-01-01

    While the delivery and reception of advice is a practice integral to a wide range of settings, little attention has been given to the detailed practices of advice resistance and how it leads to advice negotiation. Based on 7 hours of videotaped tutoring interactions among 6 tutors and 11 tutees, this conversation analytic study examines the…

  11. Implementing CBM: SQL-Tutor after Fifteen Years

    Science.gov (United States)

    Mitrovic, Antonija; Ohlsson, Stellan

    2016-01-01

    SQL-Tutor is the first constraint-based tutor. The initial conference papers about the system were published in 1998 (Mitrovic 1998a, 1998b, 1998c), with an "IJAIED" paper published in 1999 (Mitrovic and Ohlsson, "International Journal Artificial Intelligence in Education," 10(3-4), 238-256, 1999). We published another…

  12. Learners' Experiences of Peer Tutoring in the Context of Outdoor ...

    African Journals Online (AJOL)

    Learners' Experiences of Peer Tutoring in the Context of Outdoor Learning: The ... its effectiveness in promoting learning in large class sizes which characterise ... 104 Class 6 learners as tutors, 86 Class 2 learners as tutees, and 8 teachers as ...

  13. Private Tutoring through the Internet: Globalization and "Offshoring"

    Science.gov (United States)

    Ventura, Alexandre; Jang, Sunhwa

    2010-01-01

    The private tutoring industry has come forward as the third great sector of education. The common sense representation about private tutoring is changing. The growing search for supplementary educational support services and the technological innovation have created a new paradigm. This paper focuses on one of the most interesting faces of this…

  14. Household Expenditures on Private Tutoring: Emerging Evidence from Malaysia

    Science.gov (United States)

    Kenayathulla, Husaina Banu

    2013-01-01

    Private tutoring has been a burgeoning phenomenon in Malaysia for decades. This study examines the determinants of private tutoring expenditures in Malaysia using the 2004/2005 Household Expenditures Survey and applies hurdle regression models to the data. The results indicate that total household expenditures, household head's level of education,…

  15. Conceptual Tutoring Software for Promoting Deep Learning: A Case Study

    Science.gov (United States)

    Stott, Angela; Hattingh, Annemarie

    2015-01-01

    The paper presents a case study of the use of conceptual tutoring software to promote deep learning of the scientific concept of density among 50 final year pre-service student teachers in a natural sciences course in a South African university. Individually-paced electronic tutoring is potentially an effective way of meeting the students' varied…

  16. The Effects of Politeness-Related Instruction on Medical Tutoring

    Science.gov (United States)

    Bromme, Rainer; Brummernhenrich, Benjamin; Becker, Bettina-Maria; Jucks, Regina

    2012-01-01

    Tutors often fail to address learners' misconceptions. Although this may indicate a failure to grasp these misconceptions, it may simply be due to a wish to be polite and save the learner's face. In this study we examined whether instructing tutors about the pitfalls of politeness could increase the clarity and precision of their tutorial…

  17. Household Expenditures on Private Tutoring: Emerging Evidence from Malaysia

    Science.gov (United States)

    Kenayathulla, Husaina Banu

    2013-01-01

    Private tutoring has been a burgeoning phenomenon in Malaysia for decades. This study examines the determinants of private tutoring expenditures in Malaysia using the 2004/2005 Household Expenditures Survey and applies hurdle regression models to the data. The results indicate that total household expenditures, household head's level of education,…

  18. A Hypermedia Computer-Aided Parasitology Tutoring System.

    Science.gov (United States)

    Theodoropoulos, Georgios; Loumos, Vassili

    A hypermedia tutoring system for teaching parasitology to college students was developed using an object oriented software development tool, Knowledge Pro. The program was designed to meet four objectives: knowledge incorporation, tutoring, indexing of key words for Boolean search, and random generation of quiz questions with instant scoring. The…

  19. What Are Tutors' Experiences with Online Teaching? A Phenomenographic Study

    Science.gov (United States)

    Walter, Cvetanka

    2016-01-01

    This study seeks an understanding of how tutors perceived the online part of a blended learning course in the context of teaching English as a foreign language at a German university. To gain knowledge about the ways in which the tutors experienced the phenomenon, a phenomenographic methodological framework was employed. Identified were four…

  20. Teaching Database Design with Constraint-Based Tutors

    Science.gov (United States)

    Mitrovic, Antonija; Suraweera, Pramuditha

    2016-01-01

    Design tasks are difficult to teach, due to large, unstructured solution spaces, underspecified problems, non-existent problem solving algorithms and stopping criteria. In this paper, we comment on our approach to develop KERMIT, a constraint-based tutor that taught database design. In later work, we re-implemented KERMIT as EER-Tutor, and…

  1. Going Blended: New Challenges for Second Generation L2 Tutors

    Science.gov (United States)

    Nissen, Elke; Tea, Elena

    2012-01-01

    This study explores how second generation tutors within blended learning courses link the face-to-face and online course modalities--in their representations as well as through their pedagogical activities--and which aspects help them to feel involved in the course. The methodology used is a qualitative analysis of interviews with seven tutors of…

  2. Conceptual Tutoring Software for Promoting Deep Learning: A Case Study

    Science.gov (United States)

    Stott, Angela; Hattingh, Annemarie

    2015-01-01

    The paper presents a case study of the use of conceptual tutoring software to promote deep learning of the scientific concept of density among 50 final year pre-service student teachers in a natural sciences course in a South African university. Individually-paced electronic tutoring is potentially an effective way of meeting the students' varied…

  3. Federal Law Spurs Private Companies to Market Tutoring

    Science.gov (United States)

    Reid, Karla Scoon

    2004-01-01

    For-profit education companies are ramping up their businesses to tap into millions of federal dollars set aside to provide tutoring for students attending struggling schools. Under the federal No Child Left Behind Act, Title I schools that fail to reach state achievement goals three years in a row are required to offer free tutoring to students…

  4. Relationships with undergraduate nursing exchange students--a tutor perspective.

    Science.gov (United States)

    Koskinen, Liisa; Tossavainen, Kerttu

    2003-03-01

    Student exchange has been used increasingly in nursing education throughout Europe as a method of learning intercultural sensitivity. In the host country, each foreign student is assigned a personal tutor to enhance learning. The aim of this study was to describe tutor-student relationships between Finnish nurse teachers and British exchange students from the tutors' perspective. The researcher's close relationship with the study context and participants caused some ethical concerns, which will be discussed. The data consisted of tutorial session observations, research diary notes, group interviews and background questionnaires. They were analysed using Spradley's developmental research sequence method for ethnographic data. The tutoring relationship was pastoral and clinical rather than academic. The pastoral aspect of the relationship was essential in assisting the students to adjust to the stress of studying in a foreign country. On the other hand, tutors were unable to support all the students to overcome their culture shock. Tutors were uncertain about their role and did not integrate Finnish culture or practice into theory, but found their role pleasant. A dialogic tutor-student relationship is important for learning intercultural sensitivity. Tutoring strategies should be developed to assist students' adjustment to the differences in the host culture and to encourage their reflection on personal, experiential and scientific cultural knowledge during their study abroad.

  5. Using Cognitive Tutor Software in Learning Linear Algebra Word Concept

    Science.gov (United States)

    Yang, Kai-Ju

    2015-01-01

    This paper reports on a study of twelve 10th grade students using Cognitive Tutor, a math software program, to learn linear algebra word concept. The study's purpose was to examine whether students' mathematics performance as it is related to using Cognitive Tutor provided evidence to support Koedlinger's (2002) four instructional principles used…

  6. What Do Distance Language Tutors Say about Teacher Motivation?

    Science.gov (United States)

    Xiao, Junhong

    2014-01-01

    Research into motivation in education mainly centres on students' learning motivation. This article reports on an interview study of teacher motivation with the aim of investigating the effects of student-related factors and tutors' personal factors on the motivation of language tutors in the distance learning context. Findings from the study…

  7. Federal Law Spurs Private Companies to Market Tutoring

    Science.gov (United States)

    Reid, Karla Scoon

    2004-01-01

    For-profit education companies are ramping up their businesses to tap into millions of federal dollars set aside to provide tutoring for students attending struggling schools. Under the federal No Child Left Behind Act, Title I schools that fail to reach state achievement goals three years in a row are required to offer free tutoring to students…

  8. Affective feedback in a tutoring system for procedural tasks

    NARCIS (Netherlands)

    Heylen, D.K.J.; Vissers, M.; Akker, op den H.J.A.; Nijholt, A.; André, E.; Dybkjaer, L.; Minker, W.; Heisterkamp, P.

    2004-01-01

    We discuss the affective aspects of tutoring dialogues in an ITS -called INES- that helps students to practice nursing tasks using a haptic device and a virtual environment. Special attention is paid to affective control in the tutoring process by means of selecting the appropriate feedback, taking

  9. 39 Peer tutors as learning and teaching partners: a cumulative ...

    African Journals Online (AJOL)

    Peer tutors in higher education are frequently given vital teaching and ... with knowledge and learning, the role of peer tutors needs to be recognised .... able to break down difficult concepts, unpack and explain dense knowledge clearly, and ..... of the issues you have noticed in students' writing - some of the common ...

  10. Peer Tutoring Effects on Omani Students' English Self-Concept

    Science.gov (United States)

    Alrajhi, Marwa N.; Aldhafri, Said S.

    2015-01-01

    Based on the social cognitive learning theory (1997), peer learning can be viewed as an effective way of enhancing learning. In this study, peer tutoring, a form of peer learning, was examined. The current study investigated the influence of a peer tutoring program implemented at Sultan Qaboos University on students' English self-concept. 125…

  11. Peer Tutoring in the CIS Sandbox: Does It Work?

    Science.gov (United States)

    Frydenberg, Mark

    2013-01-01

    This paper reports on a student-created and facilitated peer-tutoring activity to assist first-year students in preparing for their final exam in an introductory information technology course. Tutors at the CIS Sandbox, a collaborative learning lab at an American university, offered a series of "Crunch Sessions" to their peers. This…

  12. Human Odorant Reception in the Common Bed Bug, Cimex lectularius.

    Science.gov (United States)

    Liu, Feng; Liu, Nannan

    2015-11-02

    The common bed bug Cimex lectularius is a temporary ectoparasite on humans and currently resurgent in many developed countries. The ability of bed bugs to detect human odorants in the environment is critical for their host-seeking behavior. This study deciphered the chemical basis of host detection by investigating the neuronal response of olfactory sensilla to 104 human odorants using single sensillum recording and characterized the electro-physiological responses of bed bug odorant receptors to human odorants with the Xenopus expression system. The results showed that the D type of olfactory sensilla play a predominant role in detecting the human odorants tested. Different human odorants elicited different neuronal responses with different firing frequencies and temporal dynamics. Particularly, aldehydes and alcohols are the most effective stimuli in triggering strong response while none of the carboxylic acids showed a strong stimulation. Functional characterization of two bed bug odorant receptors and co-receptors in response to human odorants revealed their specific responses to the aldehyde human odorants. Taken together, the findings of this study not only provide exciting new insights into the human odorant detection of bed bugs, but also offer valuable information for developing new reagents (attractants or repellents) for the bed bug control.

  13. True bug (Heteroptera) impact on cocoa fruit mortality and productivity.

    Science.gov (United States)

    Yede; Babin, R; Djieto-Lordon, C; Cilas, C; Dibog, L; Mahob, R; Bilong, C F Bilong

    2012-08-01

    The real impact of true bug damage on cocoa pods has never been assessed precisely. We conducted a 2-yr study on 1,080 cocoa trees on 36 farms in Cameroon to assess the contribution of true bugs to fruit mortality and production loss. The cocoa fruiting cycle, fruit mortality, and damage caused by true bugs as well as other pests and diseases were monitored on a weekly basis. True bug damage also was described on 2,500 ripe pods per year. Pod weight, bean number, and bean weight were measured and compared for different degrees and types of damage on the ripe pods. Our results showed that true bugs were the main external cause of young fruit abortion. They reduced the abundance of young fruit by up to 10%. In contrast, although one-third of the ripe pods sampled had true bug lesions, only 4% were moderately to heavily damaged. The mean weight of ripe pods was reduced by 12% when there was medium to heavy damage. While the mean weight of wet beans was reduced significantly (by 3-10%), the number of beans per pod was not changed by damage. Despite the reduction in mean weight, the overall weight of beans for the pods sampled was reduced by fruit mortality.

  14. Tutors' Influence on Distance Language Students' Learning Motivation: Voices from Learners and Tutors

    Science.gov (United States)

    Xiao, Junhong

    2012-01-01

    Teachers' influence on students' learning motivation is a well-researched topic. Nevertheless, the majority of such studies are situated in the conventional learning context despite the rapid growth of distance language learning. This study set out to investigate tutors' influence on students' learning motivation in the Chinese distance language…

  15. The INTELLIGENT RuleTutor: A Structured Approach to Intelligent Tutoring. Final Report.

    Science.gov (United States)

    Scandura, Alice B.

    This final report describes a general purpose system for developing intelligent tutors based on the Structural Learning Theory. The report opens with a discussion of the rules and related constructs that underlie cognitive constructs in all structural learning theories. The remainder of the text provides: (1) an introduction to the Structural…

  16. Tutors' Influence on Distance Language Students' Learning Motivation: Voices from Learners and Tutors

    Science.gov (United States)

    Xiao, Junhong

    2012-01-01

    Teachers' influence on students' learning motivation is a well-researched topic. Nevertheless, the majority of such studies are situated in the conventional learning context despite the rapid growth of distance language learning. This study set out to investigate tutors' influence on students' learning motivation in the Chinese distance language…

  17. EFEKTIVITAS PEMBELAJARAN TUTOR SEBAYA DALAM PEMBELAJARAN AKUNTANSI BIAYA I

    Directory of Open Access Journals (Sweden)

    Ahmad Nurkhin

    2016-01-01

    Full Text Available Implementation of bilingual classroom was the manifestation of internationalization vision of the institution (Unnes to response to the progress of International Schools (SBI / RSBI. Cost Accounting I was a subject in bilingual class of FE Unnes in 2010/2011. The objective of the study was to explain the effectiveness of peer tutor learning method in Cost Accounting I in Bilingual Class. It was a class action research done in 2 months with 2 cycles. The type of peer tutor learning was tutor to student. The result of research showed that peer tutor learning method of Cost Accounting I in Bilingual Class of FE Unnes was effective. Students’ achievement increased significantly in the first and second cycle. It passes the effectiveness indicator which stated that at least 75% students could get 71. Thus, it is suggested that other types of peer tutor learning method can be investigated empirically for further researches in different designs.

  18. The role of a PBL tutor: a personal perspective.

    Science.gov (United States)

    Chan, Li Chong

    2008-03-01

    Based on my experience as a PBL tutor in the Faculty of Medicine since 1997, it is clear that the role of a PBL tutor is one of a master of many trades. Whilst the primary role of a PBL tutor is to ensure, as a facilitator and a guide, that students engage in self-directed learning within the tutorial setting, he or she should be able to identify issues within and outside the tutorial setting that impact on learning. A PBL tutor should know the case well before the tutorial starts, establish ground rules and recognize that the quality of learning which takes place prior to and after the tutorial by students affect personal and group dynamics within the tutorial setting. The PBL tutor occupies a central and unique role in influencing students' learning and as a mentor to students' development.

  19. Bed bugs and possible transmission of human pathogens: a systematic review.

    Science.gov (United States)

    Lai, Olivia; Ho, Derek; Glick, Sharon; Jagdeo, Jared

    2016-10-01

    The global population of bed bugs (Cimex lectularius and Cimex hemipterus, family Cimicidae) has undergone a significant resurgence since the late 1990s. This is likely due to an increase in global travel, trade, and the number of insecticide-resistant bed bugs. The global bed bug population is estimated to be increasing by 100-500 % annually. The worldwide spread of bed bugs is concerning, because they are a significant socioeconomic burden and a major concern to public health. According to the United States Environmental Protection Agency, bed bugs are "a pest of significant health importance." Additionally, 68 % of U.S. pest professionals reported that bed bugs are the most challenging pest to treat. Upwards of 45 disease pathogens have been reported in bed bugs. Recent studies report that bed bugs may be competent vectors for pathogens, such as Bartonella quintana and Trypanosoma cruzi. However, public health reports have thus far failed to produce evidence that major infectious disease outbreaks have been associated with bed bugs. Since many disease pathogens have previously been reported in bed bugs and the worldwide bed bug population is now drastically increasing, it stands to reason to wonder if bed bugs might transmit human pathogens. This review includes a literature search on recently published clinical and laboratory studies (1990-2016) investigating bed bugs as potential vectors of infectious disease, and reports the significant findings and limitations of the reviewed studies. To date, no published study has demonstrated a causal relationship between bed bugs and infectious disease transmission in humans. Also, we present and propose to expand on previous hypotheses as to why bed bugs do not transmit human pathogens. Bed bugs may contain "neutralizing factors" that attenuate pathogen virulence and, thereby, decrease the ability of bed bugs to transmit infectious disease.

  20. A bioassay for studying behavioural responses of the common bed bug, Cimex lectularius (Hemiptera: Cimicidae) to bed bug-derived volatiles.

    Science.gov (United States)

    Weeks, E N I; Logan, J G; Gezan, S A; Woodcock, C M; Birkett, M A; Pickett, J A; Cameron, M M

    2011-02-01

    The common bed bug, Cimex lectularius (Hemiptera: Cimicidae), has recently re-emerged in increasing numbers, distribution and intensity of infestation in many countries. Current control relies on the application of residual pesticides; but, due to the development of insecticide resistance, there is a need for new tools and techniques. Semiochemicals (behaviour and physiology modifying chemicals) could be exploited for management of bed bugs. However, in order to identify semiochemicals that can be utilised in monitoring or control, a suitable olfactometer is needed that enables the study of the responses of bed bugs to volatile chemicals. Previous studies have used olfactometers that do not separate olfactory responses from responses to physical contact. In this study, a still-air olfactometer was used to measure behavioural responses to different bed bug-derived volatiles presented in an odour pot. Bed bugs were significantly more likely to visit the area above the odour pot first, and more frequently, in the presence of volatiles from bed bug-exposed paper but not in the presence of volatiles from conspecific bed bugs. Bed bug activity was found to be dependent on the presence of the volatiles from bed bug-exposed paper, the time during the scotophase and the sex of the insect being tested. The still-air olfactometer could be used to test putative semiochemicals, which would allow an understanding of their behavioural role in bed bug ecology. Ultimately, this could lead to the identification of new semiochemical tools for bed bug monitoring and control.

  1. [The good PBL tutor--to be or not to be: instructional films for tutors].

    Science.gov (United States)

    Skelin, Silvia; Huwendiek, Sören; Nikendei, Christoph; Dieter, Peter; Kirschfink, Michael; Bosse, Hans-Martin

    2008-01-01

    Many faculties worldwide apply the method of problem-based learning (PBL) in their curricula as a form of instruction by which students in small groups develop problem-solving strategies on the basis of a specific case. This approach fosters self-responsible and context-dependent learning, which aims at providing an improved anchoring of knowledge. For this reason, the previous decades have seen a distribution of the method to medical schools across the world. The role of the tutor assumes particular importance since, in contrast to the traditional university system, he or she serves as a facilitator who fosters and structures content-related and group-dynamic learning processes. In some cases, this requires an intervention by the tutor. The major challenge is to intervene at the right time and in an appropriate manner. This paper presents examples of difficult PBL situations using short film sequences to demonstrate and comments on potential approaches of the tutor in attempting to resolve the problem. Standard problem situations within a PBL tutorial were defined and produced in a film. A collection of seven frequent critical PBL situations are presented in short film sequences. Potential instruments of intervention are demonstrated in the videos and discussed. The film sequences may be downloaded in the supplementary of the electronic version of this article (www.sciencedirect.com). Within the framework of a tutor-training programme, the problematic situations and interventions presented in this article will help to sensitise tutors to potentially critical PBL tutorial situations and aid the development of individual resolution approaches.

  2. Designing and Evaluating Tutoring Feedback Strategies for Digital Learning Environments on the Basis of the Interactive Tutoring Feedback Model

    Science.gov (United States)

    Narciss, Susanne

    2013-01-01

    This paper describes the interactive tutoring feedback model (ITF-model; Narciss, 2006; 2008), and how it can be applied to the design and evaluation of feedback strategies for digital learning environments. The ITF-model conceptualizes formative tutoring feedback as a multidimensional instructional activity that aims at contributing to the…

  3. Volunteers Tutoring Reading-Disabled Adult Literacy Learners: A Case Study

    Science.gov (United States)

    Sandman-Hurley, Kelli

    2008-01-01

    Library-based adult literacy programs rely on volunteers to provide tutoring services to adult learners. A high percentage of volunteer tutors are matched with a reading-disabled adult literacy learner. Although all tutors are required to complete preservice tutor training, there is a limited amount of research that documents whether they utilize…

  4. Modelo de sistemas tutores inteligentes multiagente

    OpenAIRE

    Ferrer, Alejandro; Vallejos, Félix Anibal; Jiménez Rey, Elizabeth Miriam; Grossi, María Delia; Servetto, Arturo Carlos; Perichinsky, Gregorio

    2006-01-01

    Se presenta una línea de investigación del Proyecto de la Facultad de Ingeniería de la Universidad de Buenos Aires I015: Manufactura Integrada por Computadora en Sistemas Complejos para el Desarrollo Social, Industrial y de Tecnología. Se introduce conceptos básicos de los campos en los que incursiona esta línea de investigación: Sistemas Tutores Inteligentes (STI) y Sistemas Multiagentes (SMA). Se describe los aspectos esenciales que se deben considerar en el modelado de un sistema ...

  5. PROLOG BASED AN INTELLIGENT TUTORING SYSTEM (ITS

    Directory of Open Access Journals (Sweden)

    Funda DAĞ

    2004-04-01

    Full Text Available In this study; components of a web-based general purpose Intelligent Tutoring System (ITS has been realized by using Visual Prolog. A framework of the system has been constructed to apply various lesson. An ITS consists of four fundamental models which are domain expert model, user model, instruction model and user interface model. In this study, domain expert model, user model and user interface model have been realized. There are user interfaces for both author and student in the system. We aimed in this study, developing studies on ITS in our country and constructing a framework for an ITS.

  6. Categorizing Bugs with Social Networks: A Case Study on Four Open Source Software Communities

    CERN Document Server

    Zanetti, Marcelo Serrano; Tessone, Claudio Juan; Schweitzer, Frank

    2013-01-01

    Efficient bug triaging procedures are an important precondition for successful collaborative software engineering projects. Triaging bugs can become a laborious task particularly in open source software (OSS) projects with a large base of comparably inexperienced part-time contributors. In this paper, we propose an efficient and practical method to identify valid bug reports which a) refer to an actual software bug, b) are not duplicates and c) contain enough information to be processed right away. Our classification is based on nine measures to quantify the social embeddedness of bug reporters in the collaboration network. We demonstrate its applicability in a case study, using a comprehensive data set of more than 700,000 bug reports obtained from the Bugzilla installation of four major OSS communities, for a period of more than ten years. For those projects that exhibit the lowest fraction of valid bug reports, we find that the bug reporters' position in the collaboration network is a strong indicator for ...

  7. Bed bugs, public health, and social justice: Part 2, An opinion survey.

    Science.gov (United States)

    Eddy, Christopher; Jones, Susan C

    2011-04-01

    Bed bug infestations have resurged globally, nationally, and locally, yet the public health community in the U.S. has yet to mount a coordinated response to the escalating bed bug problem. Surveys of attendees at the 2009 National Environmental Health Association Annual Educational Conference & Exhibition, 2009 Ohio Association of Health Commissioners Fall Conference, 2009 Central Ohio Bed Bug Summit, and 2010 Hamilton County Council on Aging Annual Conference were conducted to gauge opinions about bed bugs. Survey results revealed that 90% of all respondents considered bed bugs to be a public health concern, and 73% indicated that bed bugs pose an environmental justice concern. These findings, which indicate that bed bugs are an inescapable public health mandate with environmental justice undertones, should rally public health agencies at federal, state, and local levels to respond with authority of agency to the escalating bed bug problem.

  8. Host-Seeking Behavior in the Bed Bug, Cimex lectularius

    Directory of Open Access Journals (Sweden)

    Vernard R. Lewis

    2011-03-01

    Full Text Available The reemergence of the bed bug, Cimex lectularius Linnaeus, has recently spawned a frenzy of public, media, and academic attention. In response to the growing rate of infestation, considerable work has been focused on identifying the various host cues utilized by the bed bug in search of a meal. Most of these behavioral studies examine movement within a confined environment, such as a Petri dish. This has prevented a more complete understanding of the insect’s host-seeking process. This work describes a novel method for studying host-seeking behavior, using various movement parameters, in a time-lapse photography system. With the use of human breath as an attractant, we qualitatively and quantitatively assessed how bed bugs navigate their environment between its harborage and the host. Levels of behavioral activity varied dramatically between bed bugs in the presence and absence of host odor. Bed bugs demonstrated not simply activation, but attraction to the chemical components of breath. Localized, stop-start host-seeking behavior or alternating periods of movement and pause were observed among bed bugs placed in the environment void of human breath, while those exposed to human breath demonstrated long range, stop-start host-seeking behavior. A more comprehensive understanding of bed bug host-seeking can lead to the development of traps and monitors that account for unique subtleties in their behavior. The time-lapse photography system uses a large, artificial environment and could also be employed to study other aspects of the insect’s behavioral patterns.

  9. Alarm Pheromones and Chemical Communication in Nymphs of the Tropical Bed Bug Cimex hemipterus (Hemiptera: Cimicidae)

    OpenAIRE

    2011-01-01

    The recent resurge of bed bug infestations (Cimex spp.; Cimicidae) and their resistance to commonly used pesticides calls for alternative methods of control. Pheromones play an important role in environmentally sustainable methods for the management of many pest insects and may therefore be applicable for the control of bed bugs. The tropical bed bug, Cimex hemipterus, is a temporary ectoparasite on humans and causes severe discomfort. Compared to the common bed bug, Cimex lectularius, little...

  10. Effects of Starvation on Deltamethrin Tolerance in Bed Bugs, Cimex lectularius L. (Hemiptera: Cimicidae).

    Science.gov (United States)

    DeVries, Zachary C; Reid, William R; Kells, Stephen A; Appel, Arthur G

    2015-01-09

    Bed bugs, Cimex lectularius L., are a major pest in the urban environment. Their presence often results in physical, psychological, and financial distress of homeowners and apartment dwellers. Although many insecticide bioassays have been performed on this pest, little attention has been paid to bed bug feeding status, which is closely linked to metabolism, molting, and mass. Therefore, we evaluated the toxicity of topically applied deltamethrin on insecticide susceptible adult male bed bugs fed 2 d, 9 d, and 21 d prior to testing. When toxicity was evaluated on a "per-bug" basis, there was no difference between 2 d [LD50 = 0.498 (0.316 - 0.692) ng·bug(-1)] and 9 d [LD50 = 0.572 (0.436 - 0.724) ng·bug(-1)] starved bugs, while 21 d starved bugs had a significantly lower LD50 [0.221 (0.075 - 0.386) ng·bug(-1)]. When toxicity was evaluated in terms of body mass, 9 d starved bugs had the highest LD50 values [0.138 (0.102 - 0.176) ng·mg(-1)], followed by 2 d starved bugs [0.095 (0.060 - 0.134) ng·mg(-1)], and then 21 d starved bugs [0.058 (0.019-0.102) ng·mg(-)¹]; the LD50 values of 2 d and 9 d starved bugs were significantly different from 21 d starved bugs. These results indicate that feeding status plays an important role in the toxicity of deltamethrin. In addition, the lack of differences between 2 d and 9 d starved bugs indicate that the blood meal itself has little impact on tolerance, but rather it is some physiological change following feeding that confers increased tolerance to bed bugs.

  11. Applying and evaluating computer-animated tutors

    Science.gov (United States)

    Massaro, Dominic W.; Bosseler, Alexis; Stone, Patrick S.; Connors, Pamela

    2002-05-01

    We have developed computer-assisted speech and language tutors for deaf, hard of hearing, and autistic children. Our language-training program utilizes our computer-animated talking head, Baldi, as the conversational agent, who guides students through a variety of exercises designed to teach vocabulary and grammer, to improve speech articulation, and to develop linguistic and phonological awareness. Baldi is an accurate three-dimensional animated talking head appropriately aligned with either synthesized or natural speech. Baldi has a tongue and palate, which can be displayed by making his skin transparent. Two specific language-training programs have been evaluated to determine if they improve word learning and speech articulation. The results indicate that the programs are effective in teaching receptive and productive language. Advantages of utilizing a computer-animated agent as a language tutor are the popularity of computers and embodied conversational agents with autistic kids, the perpetual availability of the program, and individualized instruction. Students enjoy working with Baldi because he offers extreme patience, he doesn't become angry, tired, or bored, and he is in effect a perpetual teaching machine. The results indicate that the psychology and technology of Baldi holds great promise in language learning and speech therapy. [Work supported by NSF Grant Nos. CDA-9726363 and BCS-9905176 and Public Health Service Grant No. PHS R01 DC00236.

  12. How experienced tutors facilitate tutorial dynamics in PBL groups.

    Science.gov (United States)

    Lee, Gin-Hong; Lin, Chaou-Shune; Lin, Yu-Hua

    2013-01-01

    Problem-based learning (PBL) tutorial are conducted in small groups, and successful learning in such groups requires good group facilitating skills. There is a lack of research on actual skills employed by tutors in facilitating the group dynamics. To explore the process of PBL tutorial small groups, focusing on the tutors' actual behavior in facilitating group dynamics. Eight experienced tutors from various departments in medical colleges participated in this research. Forty tutorial group sessions were videotaped. Among the 636 tutorial intervention episodes, 142 of them were associated with facilitating group dynamics. Tutors interventions as well as their recalls were transcribed verbatim. Qualitative research methods were utilized to analyze the data. There were 10 tutorial group dynamic situations and 48 tutorial skills. Analysis of the tutors' intentions employing these skills in the 10 situations showed that tutors were trying to achieve the following aims: (1) iteration of PBL principles, (2) delegation of responsibility to the students, (3) creation of a good discussion forum, and (4) the generation of a good learning atmosphere. Results from this study provide PBL tutors with a practical frame of reference on group dynamic facilitating skills and stimulate further research on this topic.

  13. Pheromones of milkweed bugs (Heteroptera: Lygaeidae) attract wayward plant bugs: Phytocoris mirid sex pheromone.

    Science.gov (United States)

    Zhang, Qing-He; Aldrich, Jeffrey R

    2003-08-01

    The synthetic aggregation pheromone of the large milkweed bug, Oncopeltus fasciatus (Dallas) (Lygaeinae), also attracted males of the plant bug, Phytocoris difficilis Knight (Miridae). Field testing partial blends against the six-component blend comprising the Oncopeltus pheromone showed that cross-attraction of P. difficilis males was due to synergism between (E)-2-octenyl acetate and (E,E)-2,4-hexadienyl acetate. Hexyl acetate was abundant in the metathoracic scent gland (MSG) secretion of P. difficilis males, but because female P. difficilis could not initially be found in the field, further combinatorial tests were guided by prior research on the pheromones of two Phytocoris species in the western United States. The combination of hexyl, (E)-2-hexenyl, and (E)-2-octenyl acetates was as attractive to P. difficilis males as the milkweed bug pheromone, yet no milkweed bugs were drawn to this blend. Gas chromatographic (GC)-electroantennographic detection (EAD) and GC-mass spectrometric (MS) analyses of female P. difficilis MSGs determined that their secretion contained predominantly hexyl, (E)-2-hexenyl, and (E)-2-octenyl acetates (all strongly EAD-active)-the latter two compounds found only in trace amounts from males-plus five minor female-specific compounds, three of which were EAD-active. (E,E)-2,4-Hexadienyl acetate was not detected from P. difficilis females or males. The blend of the three major components, hexyl, (E)-2-hexenyl, and (E)-2-octenyl acetates (2:1.5:1 by volume), was as attractive as the blend of all six EAD-active compounds identified from females, indicating that this ternary blend constitutes the sex pheromone of P. difficilis. Hexyl acetate with (E)-2-octenyl acetate also attracted males of another species, P. breviusculus Reuter, but addition of (E)-2-hexenyl acetate and/or (E,E)-2,4-hexadienyl acetate inhibited attraction of P. breviusculus males. Attraction of P. difficilis males occurred mainly during the first half of scotophase. The

  14. The role of a water bug, Sigara striata, in freshwater food webs

    Directory of Open Access Journals (Sweden)

    Jan Klecka

    2014-05-01

    Full Text Available Freshwater food webs are dominated by aquatic invertebrates whose trophic relationships are often poorly known. Here, I used laboratory experiments to study the role of a water bug, Sigara striata, as a potential predator and prey in food webs of stagnant waters. Multiple-choice predation experiment revealed that Sigara, which had been considered mostly herbivorous, also consumed larvae of Chironomus midges. Because they often occur in high densities and are among the most ubiquitous aquatic insects, Sigara water bugs may be important predators in fresh waters. A second experiment tested the role of Sigara as a potential prey for 13 common invertebrate predators. Mortality of Sigara inflicted by different predators varied widely, especially depending on body mass, foraging mode (ambush/searching and feeding mode (chewing/suctorial of the predators. Sigara was highly vulnerable to ambush predators, while searching predators caused on average 8.1 times lower mortality of Sigara. Additionally, suctorial predators consumed on average 6.6 times more Sigara individuals than chewing predators, which supports previous results hinting on potentially different predation pressures of these two types of predators on prey populations. The importance of these two foraging-related traits demonstrates the need to move from body mass based to multiple trait based descriptions of food web structure. Overall, the results suggests that detailed experimental studies of common but insufficiently known species can significantly enhance our understanding of food web structure.

  15. WYSIWIB: A Declarative Approach to Finding API Protocols and Bugs in Linux Code

    DEFF Research Database (Denmark)

    Lawall, Julia; Brunel, Julien Pierre Manuel; Palix, Nicolas Jean-Michel

    2009-01-01

    the tools on specific kinds of bugs and to relate the results to patterns in the source code. We propose a declarative approach to bug finding in Linux OS code using a control-flow based program search engine. Our approach is WYSIWIB (What You See Is Where It Bugs), since the programmer expresses...

  16. Role of vision and mechanoreception in bed bug, Cimex lectularius L. behavior.

    Science.gov (United States)

    Singh, Narinderpal; Wang, Changlu; Cooper, Richard

    2015-01-01

    The role of olfactory cues such as carbon dioxide, pheromones, and kairomones in bed bug, Cimex lectularius L. behavior has been demonstrated. However, the role of vision and mechanoreception in bed bug behavior is poorly understood. We investigated bed bug vision by determining their responses to different colors, vertical objects, and their ability to detect colors and vertical objects under low and complete dark conditions. Results show black and red paper harborages are preferred compared to yellow, green, blue, and white harborages. A bed bug trapping device with a black or red exterior surface was significantly more attractive to bed bugs than that with a white exterior surface. Bed bugs exhibited strong orientation behavior toward vertical objects. The height (15 vs. 30 cm tall) and color (brown vs. black) of the vertical object had no significant effect on orientation behavior of bed bugs. Bed bugs could differentiate color and detect vertical objects at very low background light conditions, but not in complete darkness. Bed bug preference to different substrate textures (mechanoreception) was also explored. Bed bugs preferred dyed tape compared to painted tape, textured painted plastic, and felt. These results revealed that substrate color, presence of vertical objects, and substrate texture affect host-seeking and harborage-searching behavior of bed bugs. Bed bugs may use a combination of vision, mechanoreception, and chemoreception to locate hosts and seek harborages.

  17. Role of vision and mechanoreception in bed bug, Cimex lectularius L. behavior.

    Directory of Open Access Journals (Sweden)

    Narinderpal Singh

    Full Text Available The role of olfactory cues such as carbon dioxide, pheromones, and kairomones in bed bug, Cimex lectularius L. behavior has been demonstrated. However, the role of vision and mechanoreception in bed bug behavior is poorly understood. We investigated bed bug vision by determining their responses to different colors, vertical objects, and their ability to detect colors and vertical objects under low and complete dark conditions. Results show black and red paper harborages are preferred compared to yellow, green, blue, and white harborages. A bed bug trapping device with a black or red exterior surface was significantly more attractive to bed bugs than that with a white exterior surface. Bed bugs exhibited strong orientation behavior toward vertical objects. The height (15 vs. 30 cm tall and color (brown vs. black of the vertical object had no significant effect on orientation behavior of bed bugs. Bed bugs could differentiate color and detect vertical objects at very low background light conditions, but not in complete darkness. Bed bug preference to different substrate textures (mechanoreception was also explored. Bed bugs preferred dyed tape compared to painted tape, textured painted plastic, and felt. These results revealed that substrate color, presence of vertical objects, and substrate texture affect host-seeking and harborage-searching behavior of bed bugs. Bed bugs may use a combination of vision, mechanoreception, and chemoreception to locate hosts and seek harborages.

  18. Effects of ultralow oxygen and vacuum treatments on bed bug (Heteroptera: Cimicidae) survival

    Science.gov (United States)

    Control of bed bugs has always been problematic, balancing among efficacy, safety, and cost. In this study, ultralow oxygen (ULO) and vacuum treatments were tested on bed bugs to develop a safer, effective, and environmental friendly solution to bed bug infestations. ULO treatments were establishe...

  19. WYSIWIB: A Declarative Approach to Finding API Protocols and Bugs in Linux Code

    DEFF Research Database (Denmark)

    Lawall, Julia; Brunel, Julien Pierre Manuel; Palix, Nicolas Jean-Michel

    2009-01-01

    the tools on specific kinds of bugs and to relate the results to patterns in the source code. We propose a declarative approach to bug finding in Linux OS code using a control-flow based program search engine. Our approach is WYSIWIB (What You See Is Where It Bugs), since the programmer expresses...

  20. Holistic Evaluation Framework for Automated Bug Triage Systems: Integration of Developer Performance

    Directory of Open Access Journals (Sweden)

    Dr. V. Akila

    2016-04-01

    Full Text Available Bug Triage is an important aspect of Open Source Software Development. Automated Bug Triage system is essential to reduce the cost and effort incurred by manual Bug Triage. At present, the metrics that are available in the literature to evaluate the Automated Bug Triage System are only recommendation centric. These metrics address only the correctness and coverage of the Automated Bug Triage System. Thus, there is a need for user-centric evaluation of the Bug Triage System. The two types of metrics to evaluate the Automated Bug Triage System include Recommendation Metrics and User Metrics. There is a need to corroborate the results produced by the Recommendation Metrics with User Metrics. To this end, this paper furnishes a Holistic Evaluation Framework for Bug Triage System by integrating the developer performance into the evaluation framework. The Automated Bug Triage System is also to retrieve a set of developers for resolving a bug. Hence, this paper proposes Key Performance Indicators (KPI for appraising a developer’s effectiveness in contribution towards the resolution of the bug. By applying the KPIs on the retrieved set of developers, the Bug Triage System can be evaluated quantitatively.

  1. HIGHER EDUCATION, ONLINE TUTORING AND THE TEACHING PROFESSION

    Directory of Open Access Journals (Sweden)

    Luis Roberto de Camargo Ribeiro

    2009-12-01

    Full Text Available This article brings the analysis of a study—of a descriptive-analytical nature—about online tutoring, some of its characteristics and peculiarities as compared to face-to-face education. To this end it analyzes the results of an online questionnaire answered by 222 tutors pertaining to programs offered at Universidade Federal de São Carlos (UFSCar in partnership with Universidade Aberta do Brasil (UAB and Brazilian townships. The analysis focused on tutors’ characteristics (e.g., sex, education background and teaching experience, their work organization and activities, the division of labor (between tutors and teachers responsible for subjects, and their perceptions about the nature of tutoring and education at a distance (DE. This study is chiefly based on authors such as Lortie, Tardif, and Shulman—about face-to-face teaching—and Mill, Maggio, and Kenski—on distance education. The results of this study point to the predominance of female tutors, which resembles the makeup of the teaching body in face-to-face education at the lower levels, and indicate the respondents’ high levels of schooling and considerable face-to-face teaching experience. Despite the difficulties encountered by the tutors in this study, mainly due to their lack of experience in DE and varied technical problems, most of the tutors found it easy and pleasurable to work online. The dada also suggest that the tutors enjoyed comparative autonomy as regards actions associated with content transmission as well as actions related to (virtual classroom management. This autonomy may be the basis for the respondents’ perception that the online tutor, in the context under consideration, performs a genuine teaching function.

  2. PENGGUNAAN TUTOR SEBAYA UNTUK PENINGKATAN AKTIVITAS DAN HASIL BELAJAR

    Directory of Open Access Journals (Sweden)

    Rakimahwati -

    2014-06-01

    Abstrak: Penggunaan Tutor Sebaya untuk Peningkatan Aktivitas dan Hasil Belajar. Penelitian ini bertujuan untuk meningkatkan aktivitas dan hasil belajar mahasiswa dengan menerapkan metode tutor sebaya pada perkuliahan Perencanaan Pembelajaran TK. Metode yang digunakan dalam penelitian adalah penelitian tindakan kelas. Pelaksanaan tindakan dilakukan dua siklus terhadap mahasiswa reguler Pendidikan Guru Pendidikan Anak Usia Dini (PG-PAUD Universitas Negeri Padang. Data diperoleh melalui observasi, angket dan penilaian akhir kegiatan. Data kuantitatif dianalisis dengan rerata dan persentase, dan dikom­parasikan dengan data kualitatif. Hasil penelitian menunjukkan bahwa penggunaan metode tutor sebaya dapat meningkatkan aktivitas dan hasil belajar mahasiswa.

  3. Evolutionary history of assassin bugs (insecta: hemiptera: Reduviidae: insights from divergence dating and ancestral state reconstruction.

    Directory of Open Access Journals (Sweden)

    Wei Song Hwang

    Full Text Available Assassin bugs are one of the most successful clades of predatory animals based on their species numbers (∼6,800 spp. and wide distribution in terrestrial ecosystems. Various novel prey capture strategies and remarkable prey specializations contribute to their appeal as a model to study evolutionary pathways involved in predation. Here, we reconstruct the most comprehensive reduviid phylogeny (178 taxa, 18 subfamilies to date based on molecular data (5 markers. This phylogeny tests current hypotheses on reduviid relationships emphasizing the polyphyletic Reduviinae and the blood-feeding, disease-vectoring Triatominae, and allows us, for the first time in assassin bugs, to reconstruct ancestral states of prey associations and microhabitats. Using a fossil-calibrated molecular tree, we estimated divergence times for key events in the evolutionary history of Reduviidae. Our results indicate that the polyphyletic Reduviinae fall into 11-14 separate clades. Triatominae are paraphyletic with respect to the reduviine genus Opisthacidius in the maximum likelihood analyses; this result is in contrast to prior hypotheses that found Triatominae to be monophyletic or polyphyletic and may be due to the more comprehensive taxon and character sampling in this study. The evolution of blood-feeding may thus have occurred once or twice independently among predatory assassin bugs. All prey specialists evolved from generalist ancestors, with multiple evolutionary origins of termite and ant specializations. A bark-associated life style on tree trunks is ancestral for most of the lineages of Higher Reduviidae; living on foliage has evolved at least six times independently. Reduviidae originated in the Middle Jurassic (178 Ma, but significant lineage diversification only began in the Late Cretaceous (97 Ma. The integration of molecular phylogenetics with fossil and life history data as presented in this paper provides insights into the evolutionary history of

  4. Peer tutors as learning and teaching partners: a cumulative approach to building peer tutoring capacity in higher education

    Directory of Open Access Journals (Sweden)

    Sherran Clarence

    2016-06-01

    Full Text Available Peer tutors in higher education are frequently given vital teaching and learning work to do, but the training or professional development and support opportunities they are offered vary, and more often than not peer tutors are under-supported. In order to create and sustain teaching and learning environments that are better able to facilitate students’ engagement with knowledge and learning, the role of peer tutors needs to be recognised differently, as that of learning and teaching partners to both lecturers and students. Tutors then need to be offered opportunities for more in-depth professional academic development in order to fully realise this role. This paper explores a tutor development programme within a South African writing centre that aimed at offering tutors such ongoing and cumulative opportunities for learning and growth using a balanced approach, which included scholarly research and practice-based training. Using narrative data tutors provided in reflective written reports, the paper explores the kinds of development in tutors’ thinking and action that are possible when training and development is theoretically informed, coherent, and oriented towards improving practice. 

  5. Adaptive Tutoring for Self-Regulated Learning: A Tutorial on Tutoring Systems

    Science.gov (United States)

    2014-12-01

    learning (SRL) per the Army Learning Model • ontology • tools • methods • standards • exemplars Adaptive Tutoring Systems • Adaptive • Affordable... Ontology -based Student model in Semantic-oriented Access to the Knowledge in Digital Libraries. In proc. of HUBUSKA Fourth Open Workshop “Semantic Web...support or direct). This team state model is a compound model of the trust states existing between team members. The trust relationships are bi -direction

  6. TUTOR TRAINING KEY ISSUE IN E-LEARNING / FORMACIÓN DE TUTORES. ASPECTO CLAVE EN ENSEÑANZA VIRTUAL

    Directory of Open Access Journals (Sweden)

    Andrea Astudillo

    2013-02-01

    Full Text Available The tutor has special relevance for the success of a virtual learning experience; the skills of a classroom teacher are not enough. Training processes for tutors are required to develop the necessary skills to perform the role that covers technical, pedagogical, social and administrative issues. This article presents an overview of the role of the tutors in virtual learning environments, the need to train these professionals and the experience of a Course on Tutoring, developed for the Center for Training, Experimentation and Educational Research. The Center has trained in a three-year period 1,611 tutors, to work in virtual courses offered to teachers by the Chilean Ministry of Education. The course is described, together with its instructional design, and its main results, like the high degree of retention and value assigned, all of which is understood as the first step in a process that is complemented by experience to become a virtual tutor.RESUMENEn el éxito de una experiencia formativa virtual, la figura del tutor cobra especial relevancia, las competencias de un docente presencial no son suficientes. Se requiere procesos formativos para que los tutores adquieran las competencias necesarias para desempeñar su rol que abarca las áreas técnica, pedagógica, social y administrativa. Este artículo presenta una visión general del rol del tutor en los entornos virtuales de aprendizaje, las necesidades de formar a estos profesionales y la experiencia del curso de tutores desarrollado para el Centro de Perfeccionamiento Experimentaciones e Investigaciones Pedagógicas que ha formado a los largo de tres años a 1.611 tutores, para actuar en los cursos virtuales que el Ministerio de Educación Chileno ofrece a sus docentes, se presenta el curso, su diseño instruccional, los principales resultados, como el alto grado de retención y valoración de esta instancia formativa, la cual se entiende como el primer paso de un proceso que se

  7. Two compounds in bed bug feces are sufficient to elicit off-host aggregation by bed bugs, Cimex lectularius.

    Science.gov (United States)

    Olson, Joelle F; Vers, Leonard M Ver; Moon, Roger D; Kells, Stephen A

    2017-01-01

    After feeding, bed bugs aggregate in cracks and crevices near a host. Aggregation and arrestment are mediated by tactile and chemical stimuli associated with the bugs' feces and exuviae. Volatiles derived from fecally stained filter papers were analyzed by solid-phase microextraction (SPME) and evaluated using a multichoice behavioral assay to determine their impact on bed bug aggregation. In addition, crude fecal extracts were collected in methanol, analyzed by gas chromatography coupled with electroantennogram detection (GC-EAD) and mass spectrometry (GC-MS) and evaluated in open-air multichoice behavioral assays. The SPME method was used to detect (E)-2-hexenal and (E)-2-octenal in heated bed bug feces. The presence of these two volatile components did not affect aggregation. Analysis of the crude fecal extracts revealed several semi-volatile nitrogenous compounds, a carboxylic acid and a sulfur-based compound. Adult antennae responded to compounds eluted from three regions of the crude extract using GC-EAD. A combination of two compounds, dimethyl trisulfide and methyldiethanolamine, resulted in aggregation responses equivalent to the original crude extract. Bed bug aggregation is mediated by semi-volatile compounds derived from fecal extracts, and two compounds are sufficient to elicit aggregation. The two compounds identified here could be used to enhance the effectiveness of insecticidal applications or improve monitoring techniques. © 2016 Society of Chemical Industry. © 2016 Society of Chemical Industry.

  8. WYSIWIB: A Declarative Approach to Finding Protocols and Bugs in Linux Code

    DEFF Research Database (Denmark)

    Lawall, Julia Laetitia; Brunel, Julien Pierre Manuel; Hansen, Rene Rydhof;

    2008-01-01

    a syntax that is close to that of ordinary C code. Search specifications, called semantic matches, can be easily tailored so as to either eliminate false positives or catch more potential bugs. We introduce our approach by describing three case studies which have allowed us to find 395 bugs....... the tools to be able to find specific kinds of bugs. In this paper, we propose a declarative approach based on a control-flow based program search engine. Our approach is WYSIWIB (What You See Is Where It Bugs), since the programmer is able to express specifications for protocol and bug finding using...

  9. Group living accelerates bed bug (Hemiptera: Cimicidae) development.

    Science.gov (United States)

    Saenz, Virna L; Santangelo, Richard G; Vargo, Edward L; Schal, Coby

    2014-01-01

    For many insect species, group living provides physiological and behavioral benefits, including faster development. Bed bugs (Cimex lectularius L.) live in aggregations composed of eggs, nymphs, and adults of various ages. Our aim was to determine whether bed bug nymphs reared in groups develop faster than solitary nymphs. We reared first instars either in isolation or in groups from hatching to adult emergence and recorded their development time. In addition, we investigated the effects of group housing on same-age nymphs versus nymphs reared with adults. Nymphal development was 2.2 d faster in grouped nymphs than in solitary-housed nymphs, representing 7.3% faster overall development. However, this grouping effect did not appear to be influenced by group composition. Thus, similar to other gregarious insect species, nymph development in bed bugs is faster in aggregations than in isolation.

  10. Simulating the 2012 High Plains drought using three single column versions (SCM) of BUGS5

    Science.gov (United States)

    Medina, I. D.; Denning, S.

    2013-12-01

    The impact of changes in the frequency and severity of drought on fresh water sustainability is a great concern for many regions of the world. One such location is the High Plains, where the local economy is primarily driven by fresh water withdrawals from the Ogallala Aquifer, which accounts for approximately 30% of total irrigation withdrawals from all U.S. aquifers combined. Modeling studies that focus on the feedback mechanisms that control the climate and eco-hydrology during times of drought are limited, and have used conventional General Circulation Models (GCMs) with grid length scales ranging from one hundred to several hundred kilometers. Additionally, these models utilize crude statistical parameterizations of cloud processes for estimating sub-grid fluxes of heat and moisture and have a poor representation of land surface heterogeneity. For this research, we will focus on the 2012 High Plains drought and will perform numerical simulations using three single column versions (SCM) of BUGS5 (Colorado State University (CSU) GCM coupled to the Simple Biosphere Model (SiB3)) at multiple sites overlying the Ogallala Aquifer for the 2011-2012 periods. In the first version of BUGS5, the model will be used in its standard bulk setting (single atmospheric column coupled to a single instance of SiB3), secondly, the Super-Parameterized Community Atmospheric Model (SP-CAM), a cloud resolving model (CRM consists of 64 atmospheric columns), will replace the single CSU GCM atmospheric parameterization and will be coupled to a single instance of SiB3, and for the third version of BUGS5, an instance of SiB3 will be coupled to each CRM column of the SP-CAM (64 CRM columns coupled to 64 instances of SiB3). To assess the physical realism of the land-atmosphere feedbacks simulated at each site by all versions of BUGS5, differences in simulated energy and moisture fluxes will be computed between the 2011 and 2012 period and will be compared to differences calculated using

  11. Assessing the impact of tutors on first- year academic performance ...

    African Journals Online (AJOL)

    language and the language of learning and teaching (LOLT); students lacking the socio- ... In this case, the tutorials and the tutors created a learning environment in which students ...... Communities of practice: Learning, meaning, and identity.

  12. Effect of peer tutoring and cooperative learning instructional ...

    African Journals Online (AJOL)

    African Journal for the Psychological Study of Social Issues ... sampling with the use of the Pupil Rating Scale, Mathematics Tests (A and B) for ... Keywords: peer tutoring, cooperative learning, learning disabilities, personality types, school ...

  13. Tutoring Literature Students in Dr. Frankenstein's Writing Laboratory.

    Science.gov (United States)

    McDonald, James C.

    1992-01-01

    Uses Frankenstein's monster as an analogy for understanding the relationship of student, teacher, and literary work in an academic community, and the difficult role of the tutor in helping to make the relationship work. (PRA)

  14. Multimedia in the Writing Center: Visual Rhetoric and Tutor Training

    OpenAIRE

    Conard-Salvo, Tammy

    2006-01-01

    This presentation at the Conference on College Composition and Communication (CCCC) discusses the impact that multimedia projects have on writing centers and offers one model for integrating a visual rhetoric unit in an undergraduate tutor training course.

  15. Tutorías virtuales en tiempo real.

    OpenAIRE

    Vigneron Tenorio, Alberto; Fernández Barcell, Manuel

    2012-01-01

    En la actualidad, gracias a los avances de las herramientas informáticas y la mejora en la velocidad de trasmisión de datos por Internet, podemos realizar parte de nuestras tutorías por Internet. La versión más básica de este tipo de tutorías es la atención mediante el correo electrónico. En esta presentación vamos abordar la realización de tutorías virtuales en tiempo real. Estas tutorías, sin sustituir a las presenciales, son un útil complemento. Además, es un método eficaz para la ...

  16. Tutoring Literature Students in Dr. Frankenstein's Writing Laboratory.

    Science.gov (United States)

    McDonald, James C.

    1992-01-01

    Uses Frankenstein's monster as an analogy for understanding the relationship of student, teacher, and literary work in an academic community, and the difficult role of the tutor in helping to make the relationship work. (PRA)

  17. The school failure as tutor: An exploratory approach.

    Science.gov (United States)

    Pine, F; Olesker, W

    1973-09-01

    This paper describes a pilot program in the use of high school near dropouts as tutors for young children. The work is set in the context of adolescent developmental tasks and draws its rationale from the general human tendency to reach mastery by turning passivity into activity. We ask whether adolescents who have experienced a decade of school failure and misery might use the opportunity for a new form of more active contact with the schools to master old failures. We reasoned that the very area of failure, where these adolescents show apparent uninterest through truancy and minimal work, must be a highly emotionally charged one (albeit negatively) precisely because it is an area of failure. After describing the setting and the rationale, we analyze the experience for several tutors from the point of view of their relationship to (1) the tutees, (2) the tutor-supervisor, (3) the group of adolescent tutors, and (4) the social system of the elementary school.

  18. User documentation for the MSK and OMS intelligent tutoring systems

    Science.gov (United States)

    Fink, Pamela K.; Herren, L. Tandy; Lincoln, David T.

    1991-01-01

    This user's guide describes how to use the Intelligent Tutoring Systems for the Manual Select Keyboard (MSK) and the Orbital Maneuvering System (OMS) and how to use the C code that runs the mockup version of the MSK.

  19. Empirical Analysis and Automated Classification of Security Bug Reports

    Science.gov (United States)

    Tyo, Jacob P.

    2016-01-01

    With the ever expanding amount of sensitive data being placed into computer systems, the need for effective cybersecurity is of utmost importance. However, there is a shortage of detailed empirical studies of security vulnerabilities from which cybersecurity metrics and best practices could be determined. This thesis has two main research goals: (1) to explore the distribution and characteristics of security vulnerabilities based on the information provided in bug tracking systems and (2) to develop data analytics approaches for automatic classification of bug reports as security or non-security related. This work is based on using three NASA datasets as case studies. The empirical analysis showed that the majority of software vulnerabilities belong only to a small number of types. Addressing these types of vulnerabilities will consequently lead to cost efficient improvement of software security. Since this analysis requires labeling of each bug report in the bug tracking system, we explored using machine learning to automate the classification of each bug report as a security or non-security related (two-class classification), as well as each security related bug report as specific security type (multiclass classification). In addition to using supervised machine learning algorithms, a novel unsupervised machine learning approach is proposed. An ac- curacy of 92%, recall of 96%, precision of 92%, probability of false alarm of 4%, F-Score of 81% and G-Score of 90% were the best results achieved during two-class classification. Furthermore, an accuracy of 80%, recall of 80%, precision of 94%, and F-score of 85% were the best results achieved during multiclass classification.

  20. A Program Evaluation of Intersession Tutoring

    Directory of Open Access Journals (Sweden)

    Nandang Kosasih Ananda

    2016-02-01

    Full Text Available This study examined one program which was in place in a multi-track year-round elementary school, a tutoring program delivered during the students' intersession. Through interviews, surveys, and analysis of grades recorded on report cards, the program was evaluated to determine whether goals for the program were met. Survey data revealed that students, parents, and teachers all felt overwhelmingly that the program was effective at meeting stated program goals. Report card data did not show a statistically significant increase in grades after students attended the program, but many intervening variables were not controlled for. Additional convenience factors, such as transportation, cost, and timing contributed to the program benefits

  1. Modelado del estudiante en sistemas tutores inteligentes

    Directory of Open Access Journals (Sweden)

    Cataldi, Zulma

    2010-01-01

    Full Text Available En la producción de los STI convergen las distintas epistemológicas que quedan evidenciadas en la práctica docente. Se busca una nueva opción de diseño de STI que sea más versátil centrada en la forma en que los estudiantes mantienen, organizan y adquieren los nuevos conocimientos. Las diferentes formas de pensar de los estudiantes, constituyen los estilos de aprendizaje, a través de los cuales se puede establecer el modo en que estos conocimientos se almacenan, se relacionan y se utilizan con los adquiridos anteriormente. Es necesario caracterizar a los estudiantes además considerando el tipo de inteligencia preponderante en cada uno, ya que permitirá soluciones más individualizadas. Esto conlleva a rediseñar los componentes de cada módulo del sistema tutor.

  2. Markov Chain Monte Carlo Random Effects Modeling in Magnetic Resonance Image Processing Using the BRugs Interface to WinBUGS

    Directory of Open Access Journals (Sweden)

    David G. Gadian

    2011-10-01

    Full Text Available A common feature of many magnetic resonance image (MRI data processing methods is the voxel-by-voxel (a voxel is a volume element manner in which the processing is performed. In general, however, MRI data are expected to exhibit some level of spatial correlation, rendering an independent-voxels treatment inefficient in its use of the data. Bayesian random effect models are expected to be more efficient owing to their information-borrowing behaviour. To illustrate the Bayesian random effects approach, this paper outlines a Markov chain Monte Carlo (MCMC analysis of a perfusion MRI dataset, implemented in R using the BRugs package. BRugs provides an interface to WinBUGS and its GeoBUGS add-on. WinBUGS is a widely used programme for performing MCMC analyses, with a focus on Bayesian random effect models. A simultaneous modeling of both voxels (restricted to a region of interest and multiple subjects is demonstrated. Despite the low signal-to-noise ratio in the magnetic resonance signal intensity data, useful model signal intensity profiles are obtained. The merits of random effects modeling are discussed in comparison with the alternative approaches based on region-of-interest averaging and repeated independent voxels analysis. This paper focuses on perfusion MRI for the purpose of illustration, the main proposition being that random effects modeling is expected to be beneficial in many other MRI applications in which the signal-to-noise ratio is a limiting factor.

  3. Evaluation of two least toxic integrated pest management programs for managing bed bugs (Heteroptera: Cimicidae) with discussion of a bed bug intercepting device.

    Science.gov (United States)

    Wang, Changlu; Gibb, Timothy; Bennett, Gary W

    2009-05-01

    The cost and effectiveness of two bed bug (Cimex lectularius L.) integrated pest management (IPM) programs were evaluated for 10 wk. Sixteen bed bug-infested apartments were chosen from a high-rise low-income apartment building. The apartments were randomly divided into two treatment groups: diatomaceous earth dust-based IPM (D-IPM) and chlorfenapyr spray-based IPM (S-IPM). The initial median (minimum, maximum) bed bug counts (by visual inspection) of the two treatment groups were 73.5 (10, 352) and 77 (18, 3025), respectively. A seminar and an educational brochure were delivered to residents and staff. It was followed by installing encasements on mattresses and box springs and applying hot steam to bed bug-infested areas in all 16 apartments. Diatomaceous earth dust (Mother Earth-D) was applied in the D-IPM group 2 d after steaming. In addition, bed bug-intercepting devices were installed under legs of infested beds or sofas or chairs to intercept bed bugs. The S-IPM group only received 0.5% chlorfenapyr spray (Phantom) after the nonchemical treatments. All apartments were monitored bi-weekly and retreated when necessary. After 10 wk, bed bugs were eradicated from 50% of the apartments in each group. Bed bug count reduction (mean +/- SEM) was 97.6 +/- 1.6 and 89.7 +/- 7.3% in the D-IPM and S-IPM groups, respectively. Mean treatment costs in the 10-wk period were $463 and $482 per apartment in the D-IPM and S-IPM groups, respectively. Bed bug interceptors trapped an average of 219 +/- 135 bed bugs per apartment in 10 wk. The interceptors contributed to the IPM program efficacy and were much more effective than visual inspections in estimating bed bug numbers and determining the existence of bed bug infestations.

  4. PENERAPAN MODEL PEMBELAJARAN TUTOR SEBAYA PADA MATA PELAJARAN SOSIOLOGI

    Directory of Open Access Journals (Sweden)

    Ningrum Pusporini Anggorowati

    2013-04-01

    Full Text Available Tujuan penelitian ini adalah untuk mengetahui pelaksanaannya model pembelajaran tutor sebaya (peer teaching di SMAN I Brebes. Subjek dalam penelitian ini adalah guru sosiologi kelas XI IPS 1 dan siswa kelas XI IPS 1. Hasil penelitian menunjukkan peer teaching memerlukan persiapan yang matang, dan setiap tahap pelaksanaan hendaknya dievaluasi untuk mendapatkan hasil yang baik. Faktor pendukung dalam pelaksanaan model pembelajaran tutor sebaya antara lain yaitu adanya interaksi antara guru dengan siswa, minat belajar siswa cukup tinggi, guru dan siswa lebih akrab dalam kegiatan pembelajaran, keterlibatan tutor sebaya dalam kelompok belajar membuat suasana pembelajaran lebih menarik, sedangkan faktor penghambatnya antara lain yaitu kurangnya persiapan dari para tutor, sarana dan prasarana kurang memadai, kegiatan pembelajaran kurang kondusif, dan sumber belajar kurang memadai. The objective of this study is to examine the implementation of peer tutoring learning model (peer teaching in SMAN I Brebes. Subjects in this study were teachers sociology class XI IPS 1 and class XI IPS 1. Results show that the implementation of peer teaching requires preparation, and each stage of the implementation should be evaluated to obtain good results. Factors supporting the implementation of peer tutoring learning model, among others, the interaction between teachers and students, and also student interest is high; teachers and students are more familiar in learning activities, and peer tutor involvement in the study group to make the learning environment more attractive. The inhibiting factor of peer teaching strategy include among others the lack of preparation of the tutors, inadequate infrastructure, lack of conducive learning activities, and learning resources are inadequate.

  5. Usage of data warehouse for analysing software's bugs

    Science.gov (United States)

    Živanov, Danijel; Krstićev, Danijela Boberić; Mirković, Duško

    2017-07-01

    We analysed the database schema of Bugzilla system and taking into account user's requirements for reporting, we presented a dimensional model for the data warehouse which will be used for reporting software defects. The idea proposed in this paper is not to throw away Bugzilla system because it certainly has many strengths, but to make integration of Bugzilla and the proposed data warehouse. Bugzilla would continue to be used for recording bugs that occur during the development and maintenance of software while the data warehouse would be used for storing data on bugs in an appropriate form, which is more suitable for analysis.

  6. Host Searching and Aggregation Activity of Recently Fed and Unfed Bed Bugs (Cimex lectularius L.

    Directory of Open Access Journals (Sweden)

    Matthew D. Reis

    2011-05-01

    Full Text Available Groups of starved, virgin adult male or female bed bugs were stimulated to search for a host by the presence of a heated artificial feeder. Some of the bed bug groups were allowed to obtain a blood meal and some were not. After the removal of the feeder, bed bugs were observed throughout the scotophase to record their searching and aggregation behavior. Groups of male and female bed bugs that were unable to obtain a blood meal continued to search in the arena for the majority of the scotophase. Bed bugs that were able to obtain a blood meal returned to their shelter to aggregate 30 min after feeding. Overall, the proportion of bed bugs aggregating in shelters during the scotophase was significantly greater for those that had fed successfully than those that had not. However, all bed bugs, regardless of feeding status, began to return to shelters to aggregate 2 h prior to the photophase.

  7. Host Searching and Aggregation Activity of Recently Fed and Unfed Bed Bugs (Cimex lectularius L.).

    Science.gov (United States)

    Reis, Matthew D; Miller, Dini M

    2011-05-04

    Groups of starved, virgin adult male or female bed bugs were stimulated to search for a host by the presence of a heated artificial feeder. Some of the bed bug groups were allowed to obtain a blood meal and some were not. After the removal of the feeder, bed bugs were observed throughout the scotophase to record their searching and aggregation behavior. Groups of male and female bed bugs that were unable to obtain a blood meal continued to search in the arena for the majority of the scotophase. Bed bugs that were able to obtain a blood meal returned to their shelter to aggregate 30 min after feeding. Overall, the proportion of bed bugs aggregating in shelters during the scotophase was significantly greater for those that had fed successfully than those that had not. However, all bed bugs, regardless of feeding status, began to return to shelters to aggregate 2 h prior to the photophase.

  8. Bed bugs, public health, and social justice: Part 1, A call to action.

    Science.gov (United States)

    Eddy, Christopher; Jones, Susan C

    2011-04-01

    The resurgence of bed bugs poses an urgent situation since infestations are rampant globally, nationally, and locally. In Ohio, bed bugs have become a virtual epidemic in many towns and cities, especially in central and southwestern regions of the state. These blood-feeding insects cause an array of adverse health effects in humans. Furthermore, bed bugs disproportionately occur in urban areas, and housing and the built environment are now recognized as dominant influences on health. Bed bugs' potential role in disease transmission remains unqualified to date, and research on this issue is urgently needed. The escalating global bed bug resurgence leaves the divided public health community in a precarious social justice position if the lack of response to bed bug infestations disproportionately impacts underserved populations. Bed bugs are an urgent public health and environmental justice concern, and the authors recommend that public health agencies respond with authority of agency.

  9. Education Program of peer tutors: tutoring in the process of school inclusion in the Physical Education class

    Directory of Open Access Journals (Sweden)

    Joslei Viana de Souza

    2017-05-01

    Full Text Available This research aimed to analyze the effect of peer tutoring for a student with disability in Physical Education classes. This study was supported by the qualitative methodological approach, characterized as a case study. The research was conducted in a Municipal public school located in the State of Bahia. The participants in this research were: a student with intellectual disability associated with autism spectrum disorder and five peer tutors. For data collection instrument, systematic or structured observation was employed, not participant, in a natural environment. The Physical Education classes were filmed, before and after the training of tutors. The results showed that the intervention of the peer tutors, with teaching strategies, culminated in increasing the participation level of the student with disabilities, contributing to the process of inclusion in Physical Education classes.

  10. Transcriptomics of the bed bug (Cimex lectularius.

    Directory of Open Access Journals (Sweden)

    Xiaodong Bai

    Full Text Available BACKGROUND: Bed bugs (Cimex lectularius are blood-feeding insects poised to become one of the major pests in households throughout the United States. Resistance of C. lectularius to insecticides/pesticides is one factor thought to be involved in its sudden resurgence. Despite its high-impact status, scant knowledge exists at the genomic level for C. lectularius. Hence, we subjected the C. lectularius transcriptome to 454 pyrosequencing in order to identify potential genes involved in pesticide resistance. METHODOLOGY AND PRINCIPAL FINDINGS: Using 454 pyrosequencing, we obtained a total of 216,419 reads with 79,596,412 bp, which were assembled into 35,646 expressed sequence tags (3902 contigs and 31744 singletons. Nearly 85.9% of the C. lectularius sequences showed similarity to insect sequences, but 44.8% of the deduced proteins of C. lectularius did not show similarity with sequences in the GenBank non-redundant database. KEGG analysis revealed putative members of several detoxification pathways involved in pesticide resistance. Lamprin domains, Protein Kinase domains, Protein Tyrosine Kinase domains and cytochrome P450 domains were among the top Pfam domains predicted for the C. lectularius sequences. An initial assessment of putative defense genes, including a cytochrome P450 and a glutathione-S-transferase (GST, revealed high transcript levels for the cytochrome P450 (CYP9 in pesticide-exposed versus pesticide-susceptible C. lectularius populations. A significant number of single nucleotide polymorphisms (296 and microsatellite loci (370 were predicted in the C. lectularius sequences. Furthermore, 59 putative sequences of Wolbachia were retrieved from the database. CONCLUSIONS: To our knowledge this is the first study to elucidate the genetic makeup of C. lectularius. This pyrosequencing effort provides clues to the identification of potential detoxification genes involved in pesticide resistance of C. lectularius and lays the foundation for

  11. The student tutor experience in a problem-based learning course: A case study

    Science.gov (United States)

    Moore, Tricia Susan

    This case study, conducted from an interpretive paradigm, illuminates contextual factors related to the tutor experience when senior undergraduate dental hygiene students served as tutors for beginning undergraduate dental hygiene students, or sophomores, in a 1-semester, 2-hour long problem-based learning (PBL) course in a Baccalaureate Dental Hygiene (BDH) curriculum during the spring semester of 2008. Data were collected using various sources and methods. Six tutors and three administrators were interviewed, tutees completed an anonymous questionnaire, the tutorial process and tutor training sessions were observed, and related documents were examined. Data analysis included open and axial coding, creation of tutor profiles, and identification of patterns. Tutor behaviors varied with respect to the nature of intervention (e.g., telling, asking, clarifying, acknowledging), emphasis (process, content, social), and facilitation style (directive, suggestive, empowering). Patterns in tutor behavior and attitudes emerged related to comfort and growth, persistence and lenience, and compliance, resistance, and innovation. Differences in tutor understanding and perception of their role and the purpose of PBL influenced the role the tutor assumed. Other factors that influenced tutor behavior included tutor intentions, tutor training, and environmental factors such as the nature of problems, allotted time, and tutorial group characteristics. The influence of these factors can be understood by applying Fishbein's integrated model of behavior prediction (Fishbein, 2008). Tutor training included experiencing the PBL student role, attending class, and sharing experiences with other tutors in weekly seminar sessions facilitated by a tutor supervisor. Tutor's gained confidence, knowledge, skills, and friendship. They also had the opportunity to see things from a new perspective, that of a teacher encouraging self-direction rather than a student depending on others for direction

  12. Tracking bed bugs (Cimex lectularius): a study of the effect of physiological and extrinsic factors on the response to bed bug-derived volatiles.

    Science.gov (United States)

    Weeks, E N I; Logan, J G; Birkett, M A; Pickett, J A; Cameron, M M

    2013-02-01

    The common bed bug, Cimex lectularius, feeds on the blood of mammal and bird hosts, and is a pest of global importance. Semiochemicals are chemicals involved in animal communication that may affect behaviour and/or physiology. Attractive semiochemicals that play a role in mediating bed bug behaviour could be exploited for the development of a highly effective novel monitoring device. Tracking software was used to record the response of bed bugs to volatiles from paper previously exposed to conspecific bugs in a still-air olfactometer illuminated by infrared lights, through a variety of activity variables. The effect of time of day as an extrinsic factor, and sex, stage, mating status and nutritional status as physiological factors on the response of bed bugs to the volatiles was examined. Bed bugs of both sexes and all stages responded to the volatiles from bed bug-exposed papers, showing significant attraction and orientation towards the volatile source whether they were starved or engorged. Confirmation that the physiological factors examined do not affect the response of bed bugs to the volatiles from bed bug-exposed papers provides evidence that these bed bug-derived volatiles contain aggregation cues, as semiochemicals that promote aggregation should by definition be detected by both sexes and all life stages. A device baited with such semiochemicals could play a major role in limiting the impact of the current bed bug resurgence by enabling timely detection of infestations, along with quantitative evaluation of control and effective surveillance of the geographical distribution of the pest species.

  13. The Bug river - Corridor in the Pan European

    NARCIS (Netherlands)

    Zingstra, H.L.; Simeonova, V.; Kitnaes, K.

    2009-01-01

    This is the final report of the BBI/Matra project 2006/015 “Protection and Management of the Bug as an Ecological Corridor in the Pan European Ecological Network” and is based on “status reports” written for each of the three riparian countries. The purpose of the project was to investigate the

  14. Cases of bed bug (Cimex lectularius infestations in Northwest Italy

    Directory of Open Access Journals (Sweden)

    Federica Giorda

    2013-12-01

    Full Text Available Bed bugs (Cimex lectularius have been a common problem for humans for at least 3,500 years and in Europe their presence was endemic until the end of World War II, when infestations began to decrease. However, since the beginning of the 21st century new cases of infestations have been reported in developed countries. Many theories have been put forward to explain this change of direction, but none has been scientifically proven. The aim of this study is to provide some reports of bed bug infestations in Northern Italy (Liguria, Piedmont and Aosta valley regions and a brief summary about their identification, clinical significance, bioecology and control. From 2008 to date, 17 bed bug infestations were identified in Northwest Italy. Knowledge about the presence and distribution of bed bugs in Italy is scanty, prior to this work only 2 studies reported the comeback of these arthropods in the Italian territory; further investigations would be necessary to better understand the current situation.

  15. Sex pheromone of the mirid bug, Adelphocoris suturalis

    Science.gov (United States)

    Mirid bugs (Hemiptera: Miridae) are phytophagous insect pests that damage many types of economically significant field crops. In recent years, a great deal of attention has been paid to the species, Adelphocoris suturalis, because of it outbreaks in Bt cotton. Our previous work showed that virgin A....

  16. Bullous reactions to bed bug bites reflect cutaneous vasculitis

    Science.gov (United States)

    This study evaluates bullous cutaneous reactions and sequential histopathology in an individual sensitized to bed bug bites in an effort to better understand the allergic response and histology associated with these bites. There was a progression of the inflammatory response across time ranging from...

  17. sorghum head bug infestation and mould infection on the grain ...

    African Journals Online (AJOL)

    ACSS

    2017-08-01

    Aug 1, 2017 ... was to investigate the effect of head bug (Eurystylus oldi (POPPIUS) ... after maize (Zea mays L.), but the most ... sorghum grain directly under high humidity ... The plant type is tan, with white grain covered with brown glumes. .... High performing breeding lines ... population density, followed by Nyankpala.

  18. Cases of bed bug (Cimex lectularius) infestations in Northwest Italy.

    Science.gov (United States)

    Giorda, Federica; Guardone, Lisa; Mancini, Marialetizia; Accorsi, Annalisa; Macchioni, Fabio; Mignone, Walter

    2013-01-01

    CBed bugs (Cimex lectularius) have been a common problem for humans for at least 3,500 years and in Europe their presence was endemic until the end of World War II, when infestations began to decrease. However, since the beginning of the 21st century new cases of infestations have been reported in developed countries. Many theories have been put forward to explain this change of direction, but none has been scientifically proven. The aim of this study is to provide some reports of bed bug infestations in Northern Italy (Liguria, Piedmont and Aosta valley regions) and a brief summary about their identification, clinical significance, bioecology and control. From 2008 to date, 17 bed bug infestations were identified in Northwest Italy. Knowledge about the presence and distribution of bed bugs in Italy is scanty, prior to this work only 2 studies reported the comeback of these arthropods in the Italian territory; further investigations would be necessary to better understand the current situation.

  19. Bug bites and stings: When to see a dermatologist

    Medline Plus

    Full Text Available ... counter oral antihistamine. To reduce swelling , apply an ice pack to the bite. If you experience any serious symptoms after a bug bite, such as a rash, fever, or body aches, see your doctor or a board-certified dermatologist immediately. Make sure you tell the doctor about your recent ...

  20. Teaching through Trade Books: Roly-Poly Pill Bugs

    Science.gov (United States)

    Morgan, Emily; Ansberry, Karen

    2016-01-01

    Pill bugs, also called roly-polies, are small terrestrial isopods that are abundant in temperate areas throughout the world. Because they are engaging, harmless, and easily collected, they provide an excellent opportunity for children to learn about invertebrate body parts, behaviors, and information processing. This column includes activities…

  1. Cuticular hydrocarbons from the bed bug Cimex lectularius L.

    Science.gov (United States)

    Pentane extracts of male and female bed bugs were analyzed by gas chromatography and mass spectrometry in an effort to identify cuticular hydrocarbons. Seventeen hydrocarbons accounting for nearly 99% of the compounds eluting in the cuticular hydrocarbon region were identified. The sample contained ...

  2. Insecticide assays against the brown stink bug feeding on pecan

    Science.gov (United States)

    The brown stink bug, Euschistus servus (Say) (Hemiptera: Pentatomidae), is an economic pest of pecan, Carya illinoinensis (Wangenh) K. Koch (Juglandaceae), and other agronomic crops across the southeastern U.S. Management of this pest is mainly via insecticides. Many commercial products indicate o...

  3. Bug bites and stings: When to see a dermatologist

    Medline Plus

    Full Text Available ... Mohs AUC MyDermPath+ Psoriasis Patient education resources Practice Management Center Coding and reimbursement Coding MACRA Fee schedule ... it’s important to take steps to reduce your risk. To help prevent bug bites, dermatologists recommend the ...

  4. sesame harvest loss caused by sesame seed bug, elasmolomus ...

    African Journals Online (AJOL)

    ADMIN

    is one of the reasons. In this study, sesame seed weight loss due to sesame seed bug was determined at ..... are woven polypropylene bags made to store and transport grain products. ... taking away the whole seed to their resting or sheltering ...

  5. Color preference of harlequin bug, Murgantia histrionica (Heteroptera: Pentatomidae)

    Science.gov (United States)

    Harlequin bug, Murgantia histrionica (Hahn), is an important pest of Brassica crops in the southern United States. Regional populations are highly variable and unpredictable from farm to farm, and therefore accurate monitoring of activity would greatly improve IPM decision-making and the timing of c...

  6. Finding Error Handling Bugs in OpenSSL using Coccinelle

    DEFF Research Database (Denmark)

    Lawall, Julia; Laurie, Ben; Hansen, Rene Rydhof

    2010-01-01

    in Linux kernel code using the program matching and transformation engine Coccinelle.  In this work, we report on our experience in applying this methodology to OpenSSL, focusing on API usage protocols related to error handling.  We have detected over 30 bugs in a recent OpenSSL snapshot, and in many cases...

  7. Software bug prediction using object-oriented metrics

    Indian Academy of Sciences (India)

    DHARMENDRA LAL GUPTA; KAVITA SAXENA

    2017-05-01

    Software quality is the fundamental requirement for a user, academia person, software developing organizations and researchers. In this paper a model for object-oriented Software Bug Prediction System (SBPS) has been developed. This model is capable of predicting the existence of bugs in a class if found, during software validation using metrics. The designed model forecasts the occurrences of bugs in a class when any new system is tested on it. For this experiment some open source similar types of defect datasets (projects) have been collected from Promise Software Engineering Repository. Some of these datasets have been selected for prediction of bugs, of which a few are not involved in model construction. First of all, we have formulated some hypotheses corresponding to each and every metric, and from metrics validation based on hypothesis basis finally 14 best suitable metrics have been selected for model creation. The Logistic Regression Classifier provides good accuracy among all classifiers. The proposed model is trained and tested on each of the validateddataset, including validated Combined Dataset separately too. The performance measure (accuracy) is computed in each case and finally it is found that the model provides overall averaged accuracy of 76.27%.

  8. Seasonal phenology and natural enemies of the squash bug (Hemiptera: Coreidae) in Kentucky.

    Science.gov (United States)

    Decker, Kimberly B; Yeargan, Kenneth V

    2008-06-01

    The squash bug, Anasa tristis (De Geer), is a major indigenous pest of Cucurbita species across the United States and a vector of cucurbit yellow vine disease. The seasonal phenology of the squash bug in central Kentucky and its natural enemies were studied using summer squash planted sequentially throughout the 2005 and 2006 growing seasons. The squash bug was first detected on 5 June 2005 and 3 June 2006. In both years, peak numbers of all squash bug stages occurred in July and August. Our field data, substantiated by published degree-day models for squash bug development, suggest one complete and a partial second generation of squash bugs in 2005 and one complete generation of squash bugs in 2006. The most abundant ground-active predators in squash fields included Araneae, Carabidae, Staphylinidae, and Geocoridae. Coleomegilla maculata (De Geer) and Geocoris punctipes (Say) were the most abundant foliage-inhabiting predators. Direct field observations of predators feeding on squash bugs or their eggs included G. punctipes, Pagasa fusca (Stein), and Nabis sp. The parasitoids Trichopoda pennipes (Fabricius) and Gyron pennsylvanicum (Ashmead) were found also. Squash bug egg masses were monitored to determine predation and parasitism rates in the field. In four studies during 2005 and 2006, predation rates were low (7% or less), and parasitism ranged from 0 to 31%. Overall, squash bug egg mortality increased as the season progressed.

  9. Infestation by pyrethroids resistant bed bugs in the suburb of Paris, France

    Directory of Open Access Journals (Sweden)

    Durand R.

    2012-11-01

    Full Text Available Bed bugs are hematophagous insects responsible for a re-emerging and challenging indoor pest in many countries. Bed bugs infestations may have health consequences including nuisance biting, cutaneous and systemic reactions. This resurgence can probably be attributed to factors such as increased international travel and development of resistance against insecticides. Resistance against pyrethroids has been reported several times from the USA and rarely in Europe. In France, very few data on bed bugs are available. The present study aimed to assess the infestation by bed bugs of a complex of two high-rise apartment buildings in the suburb of Paris and to evaluate their susceptibility to pyrethroid insecticides. We inspected for bed bugs 192 out of 198 apartments units (97% and interviewed their residents. 76 (39.6% apartments were infested. Among the 97 residents living in infested apartments, 53 (54.6% reported bed bug bites. A total of 564 bed bugs were collected in the infested units. Bioassays showed that 54 out of 143 bed bugs were resistant to pyrethroids (37.8%; 95% confidence interval: 29.9-45.7%. DNA sequencing showed that all bed bugs tested (n = 124 had homozygous L925I kdr-like gene mutation. The level of pyrethroid resistance found indicates that this phenomenon was already established in the site and prompts the need to reevaluate the wide use of pyrethroids to control bed bugs.

  10. Infestation by pyrethroids resistant bed bugs in the suburb of Paris, France.

    Science.gov (United States)

    Durand, R; Cannet, A; Berdjane, Z; Bruel, C; Haouchine, D; Delaunay, P; Izri, A

    2012-11-01

    Bed bugs are hematophagous insects responsible for a re-emerging and challenging indoor pest in many countries. Bed bugs infestations may have health consequences including nuisance biting, cutaneous and systemic reactions. This resurgence can probably be attributed to factors such as increased international travel and development of resistance against insecticides. Resistance against pyrethroids has been reported several times from the USA and rarely in Europe. In France, very few data on bed bugs are available. The present study aimed to assess the infestation by bed bugs of a complex of two high-rise apartment buildings in the suburb of Paris and to evaluate their susceptibility to pyrethroid insecticides. We inspected for bed bugs 192 out of 198 apartments units (97%) and interviewed their residents. 76 (39.6%) apartments were infested. Among the 97 residents living in infested apartments, 53 (54.6%) reported bed bug bites. A total of 564 bed bugs were collected in the infested units. Bioassays showed that 54 out of 143 bed bugs were resistant to pyrethroids (37.8%; 95% confidence interval: 29.9-45.7%). DNA sequencing showed that all bed bugs tested (n=124) had homozygous L925I kdr-like gene mutation. The level of pyrethroid resistance found indicates that this phenomenon was already established in the site and prompts the need to reevaluate the wide use of pyrethroids to control bed bugs.

  11. Feel the heat: activation, orientation and feeding responses of bed bugs to targets at different temperatures.

    Science.gov (United States)

    DeVries, Zachary C; Mick, Russell; Schal, Coby

    2016-12-01

    Host location in bed bugs is poorly understood. Of the primary host-associated cues known to attract bed bugs - CO2, odors, heat - heat has received little attention as an independent stimulus. We evaluated the effects of target temperatures ranging from 23 to 48°C on bed bug activation, orientation and feeding. Activation and orientation responses were assessed using a heated target in a circular arena. All targets heated above ambient temperature activated bed bugs (initiated movement) and elicited oriented movement toward the target, with higher temperatures generally resulting in faster activation and orientation. The distance over which bed bugs could orient toward a heat source was measured using a 2-choice T-maze assay. Positive thermotaxis was limited to distances <3 cm. Bed bug feeding responses on an artificial feeding system increased with feeder temperature up to 38 and 43°C, and declined precipitously at 48°C. In addition, bed bugs responded to the relative difference between ambient and feeder temperatures. These results highlight the wide range of temperatures that elicit activation, orientation and feeding responses in bed bugs. In contrast, the ability of bed bugs to correctly orient towards a heated target, independently of other cues, is limited to very short distances (<3 cm). Finally, bed bug feeding is shown to be relative to ambient temperature, not an absolute response to feeder blood temperature. © 2016. Published by The Company of Biologists Ltd.

  12. Kissing Bug (Triatoma spp.) Intrusion into Homes: Troublesome Bites and Domiciliation.

    Science.gov (United States)

    Klotz, Stephen A; Shirazi, F Mazda; Boesen, Keith; Beatty, Norman L; Dorn, Patricia L; Smith, Shannon; Schmidt, Justin O

    2016-01-01

    Kissing bugs (Triatoma spp.) frequently enter homes and bite human and pet occupants. Bites may lead to severe allergic reactions and, in some cases, death. Kissing bugs are also vectors of Trypanosoma cruzi, the cause of Chagas disease. In general, modern houses in the United States are not conducive to domiciliation of kissing bugs (bugs living out their entire life within the home with the presence of eggs, nymphs, adults, and exuviae). Construction features such as concrete foundations, solid walls and ceilings, window screens, tight thresholds for doors and windows, and other measures impede bug entry into homes, and air conditioning reduces the need for open doors and windows. Where Chagas disease is endemic in Mexico and Central and South America, homes often have thatch roofs, adobe walls, and open doors and windows. We investigated numerous instances of kissing bug intrusions into homes in Southern Arizona, California, and Louisiana and documented the reactions to kissing bug bites. Our work confirms the importance of modern home construction in limiting kissing bug intrusions. Older homes, especially those lacking modern screening, caulking, and weather stripping to reduce air leakage, may be subject to kissing bug intrusions and domiciliation. We describe a community in Southern Arizona where domiciliation of homes by Triatoma recurva is common. We also provide recent data regarding kissing bug bites and allergic reactions to the bites.

  13. Ability of the bed bug (Hemiptera: Cimicidae) defensive secretions (E)-2-hexenal and (E)-2-octenal to attract adult bed bugs

    Science.gov (United States)

    Accurate and timely surveillance of bed bug infestations is critical for development of effective control strategies. While the bed bug produced volatiles (E)-2-hexenal and (E)-2-octenal are considered defensive secretions, through use of EthoVision® video-tracking software we demonstrate that low ...

  14. Reporting the Effects of Interventions to the Tutor with Meta-Indicators

    Science.gov (United States)

    Després, Christophe; Jacoboni, Pierre; Py, Dominique; Lekira, Aina

    2016-01-01

    In this paper, we study how to support a human tutor who regulates learners' activities, in a situation of mediated tutoring. Our goal is to provide the tutor with information about the effect of his/her interventions. To achieve this, we adopt an indicator-based approach and define the notion of meta-indicator. The distinguishing feature of…

  15. A Flowchart-Based Intelligent Tutoring System for Improving Problem-Solving Skills of Novice Programmers

    Science.gov (United States)

    Hooshyar, D.; Ahmad, R. B.; Yousefi, M.; Yusop, F. D.; Horng, S.-J.

    2015-01-01

    Intelligent tutoring and personalization are considered as the two most important factors in the research of learning systems and environments. An effective tool that can be used to improve problem-solving ability is an Intelligent Tutoring System which is capable of mimicking a human tutor's actions in implementing a one-to-one personalized and…

  16. To What Extent Do Tutor-Related Behaviours Influence Student Learning in PBL?

    Science.gov (United States)

    Chng, Esther; Yew, Elaine H. J.; Schmidt, Henk G.

    2015-01-01

    The purpose of this study was to investigate how tutor behaviours influence learning in problem-based learning (PBL). A previous study had indicated a significant influence of the tutor's social congruent behaviour on the PBL process and this study further investigates this finding by examining two groups of tutors displaying differences in…

  17. Facilitating Group Analysis of Two Case Studies Utilising Peer Tutoring: Comparison of Tasks and Outcomes

    Science.gov (United States)

    Fong, Lin Siew

    2016-01-01

    Peer-tutoring sessions of two groups of advanced diploma in financial accounting students with mixed proficiency were analysed thoroughly in this study. Numerous studies in peer tutoring have produced favourable results to both tutors and tutees due to the scaffolding process which promotes effective learning. However, there is a lack of studies…

  18. An Interview Reflection on "Intelligent Tutoring Goes to School in the Big City"

    Science.gov (United States)

    Koedinger, Kenneth R.; Aleven, Vincent

    2016-01-01

    Our 1997 article in "IJAIED" reported on a study that showed that a new algebra curriculum with an embedded intelligent tutoring system (the Algebra Cognitive Tutor) dramatically enhanced high-school students' learning. The main motivation for the study was to demonstrate that intelligent tutors that have cognitive science research…

  19. Measuring the Moral Reasoning Competencies of Service-Learning e-Tutors

    Science.gov (United States)

    Chien, Chih-Feng; Liao, Ching-Jung; Walters, Brent G.; Lee, Ching-Yieh

    2016-01-01

    As education has turned towards technology to provide academic support, the incidence of e-tutoring has grown due to decreasing educational budgets and as a potential remedy for the generational digital divide. However, many service-learning e-tutoring studies have focused on tutees' academic achievement and tutors' cognitive development rather…

  20. Reexamining the Literature: The Impact of Peer Tutoring on Higher Order Learning

    Science.gov (United States)

    Morano, Stephanie; Riccomini, Paul J.

    2017-01-01

    The body of peer-tutoring intervention research targeting higher order learning (HOL) objectives for middle and high school students with disabilities is reviewed. Peer-tutoring outcomes are synthesized and studies are analyzed to examine the influence of tutoring procedures and study design features on intervention efficacy. Findings show that…

  1. A Window into Mathematical Support: How Parents' Perceptions Change Following Observations of Mathematics Tutoring

    Science.gov (United States)

    Westenskow, Arla; Boyer-Thurgood, Jennifer; Moyer-Packenham, Patricia S.

    2015-01-01

    This research study examined the perceptions of 24 parents of rising 5th-grade students with mathematics learning difficulties as part of a 10-week summer mathematics tutoring experience. During the summer tutoring program, parents observed their children participating in mathematics learning experiences during one-to-one tutoring sessions. At the…

  2. The demand for private tutoring in Turkey: unintended consequences of curriculum reform

    NARCIS (Netherlands)

    Altinyelken, H.K.; Bray, M.; Mazawi, A.E.; Sultana, R.G.

    2013-01-01

    This chapter focuses on the private tutoring phenomenon in Turkey. It seeks to analyse the impact of the revision of primary school curriculum on the demand for private tutoring. It also outlines various academic, economic and social implications of private tutoring. Based on interviews with school

  3. Design, Implementation, and Evaluation of a Tutor Training for Problem Based Learning in Undergraduate Psychology Courses

    Science.gov (United States)

    Mühlfelder, Manfred; Konermann, Tobias; Borchard, Linda-Marie

    2015-01-01

    In this paper we describe a "Train the Tutor" programme (TtT) for developing the metacognitive skills, facilitator skills, and tutor skills of students in a problem based learning (PBL) context. The purpose of the programme was to train 2nd and 3rd year undergraduate students in psychology to become effective PBL tutors for…

  4. A Flowchart-Based Intelligent Tutoring System for Improving Problem-Solving Skills of Novice Programmers

    Science.gov (United States)

    Hooshyar, D.; Ahmad, R. B.; Yousefi, M.; Yusop, F. D.; Horng, S.-J.

    2015-01-01

    Intelligent tutoring and personalization are considered as the two most important factors in the research of learning systems and environments. An effective tool that can be used to improve problem-solving ability is an Intelligent Tutoring System which is capable of mimicking a human tutor's actions in implementing a one-to-one personalized and…

  5. Analyzing Log Files to Predict Students' Problem Solving Performance in a Computer-Based Physics Tutor

    Science.gov (United States)

    Lee, Young-Jin

    2015-01-01

    This study investigates whether information saved in the log files of a computer-based tutor can be used to predict the problem solving performance of students. The log files of a computer-based physics tutoring environment called Andes Physics Tutor was analyzed to build a logistic regression model that predicted success and failure of students'…

  6. ASPIRE: An Authoring System and Deployment Environment for Constraint-Based Tutors

    Science.gov (United States)

    Mitrovic, Antonija; Martin, Brent; Suraweera, Pramuditha; Zakharov, Konstantin; Milik, Nancy; Holland, Jay; McGuigan, Nicholas

    2009-01-01

    Over the last decade, the Intelligent Computer Tutoring Group (ICTG) has implemented many successful constraint-based Intelligent Tutoring Systems (ITSs) in a variety of instructional domains. Our tutors have proven their effectiveness not only in controlled lab studies but also in real classrooms, and some of them have been commercialized.…

  7. Modeling and Evaluating Tutors' Function Using Data Mining and Fuzzy Logic Techniques

    Science.gov (United States)

    Bendjebar, Safia; Lafifi, Yacine; Seridi, Hamid

    2016-01-01

    In e-learning systems, the tutors play many roles and carry out several tasks that differ from one system to another. The activity of tutoring is influenced by many factors. One factor among them is the assignment of the appropriate profile to the tutor. For this reason, the authors propose a new approach for modeling and evaluating the function…

  8. Identifying and Describing Tutor Archetypes: The Pragmatist, the Architect, and the Surveyor

    Science.gov (United States)

    Harootunian, Jeff A.; Quinn, Robert J.

    2008-01-01

    In this article, the authors identify and anecdotally describe three tutor archetypes: the pragmatist, the architect, and the surveyor. These descriptions, based on observations of remedial mathematics tutors at a land-grant university, shed light on a variety of philosophical beliefs regarding and pedagogical approaches to tutoring. An analysis…

  9. Modeling and Evaluating Tutors' Function Using Data Mining and Fuzzy Logic Techniques

    Science.gov (United States)

    Bendjebar, Safia; Lafifi, Yacine; Seridi, Hamid

    2016-01-01

    In e-learning systems, the tutors play many roles and carry out several tasks that differ from one system to another. The activity of tutoring is influenced by many factors. One factor among them is the assignment of the appropriate profile to the tutor. For this reason, the authors propose a new approach for modeling and evaluating the function…

  10. An Evaluation of the Generalized Intelligent Framework for Tutoring (GIFT) from an Author’s Perspective

    Science.gov (United States)

    2014-12-01

    SCHOLAR, developed in 1970 in the form of an education tutor ( Carbonell 1970). This was a very basic form of intelligent tutoring; many have been...group instruction as effective as one- to-one tutoring. Educational Researcher. 1984;13(6):4–16. Carbonell . AI in CAI: an artificial intelligence

  11. Managing Time: A Study among Arab Open University Tutors in Kuwait Branch

    Science.gov (United States)

    Sharif, Abdin M.; Ismail, Omer H.

    2010-01-01

    The purpose of this paper was to investigate how tutors at the Arab Open University (AOU) in Kuwait Branch manage their time given workloads they are assigned. Group interviews were conducted with a sample that was selected from AOU tutors in Kuwait branch. The findings showed that tutors do not ask for more time or cut down workloads; instead,…

  12. Dr Math moves to C³TO: Chatter call center/tutoring online

    CSIR Research Space (South Africa)

    Butgereit, L

    2010-01-01

    Full Text Available Dr Math is a mobile tutoring system which has been running in South Africa for three years. It links primary and secondary school pupils to tutors in mathematics. The pupils use the popular Mxit chat client on their cell phones. The tutors use full...

  13. Studying Thought Processes of Online Peer Tutors through Stimulated-Recall Interviews

    Science.gov (United States)

    De Smet, Marijke; Van Keer, Hilde; De Wever, Bram; Valcke, Martin

    2010-01-01

    The present study aims to explore the cognitive processes of older students during their peer tutoring support of freshmen engaged in asynchronous discussion groups. Stimulated-recall was applied to study the underlying motives for specific tutor behavior in the online discussions and to make tutors' concerns explicit. A grounded theory approach…

  14. Communication skills of tutors and family medicine physician residents in Primary Care clinics.

    Science.gov (United States)

    Valverde Bolívar, Francisco Javier; Pedregal González, Miguel; Pérez Fuentes, María Francisca; Alcalde Molina, María Dolores; Torío Durántez, Jesús; Delgado Rodríguez, Miguel

    2016-12-01

    To determine the communicative profiles of family physicians and the characteristics associated with an improved level of communication with the patient. A descriptive multicentre study. Primary Healthcare Centres in Almeria, Granada, Jaen and Huelva. 119 family physicians (tutors and 4th year resident physicians) filmed and observed with patients. Demographic and professional characteristics. Analysis of the communication between physicians and patients, using a CICAA (Connect, Identify, Understand, Agree and Assist, in English) scale. A descriptive, bivariate, multiple linear regression analysis was performed. There were 436 valid interviews. Almost 100% of physicians were polite and friendly, facilitating a dialogue with the patient and allowing them to express their doubts. However, few physicians attempted to explore the state of mind of the patient, or enquire about their family situation or any important stressful events, nor did they ask open questions. Furthermore, few physicians summarised the information gathered. The mean score was 21.43±5.91 points (maximum 58). There were no differences in the total score between gender, city, or type of centre. The linear regression verified that the highest scores were obtained from tutors (B: 2.98), from the duration of the consultations (B: 0.63), and from the age of the professionals (B: -0.1). Physicians excel in terms of creating a friendly environment, possessing good listening skills, and providing the patient with information. However the ability to empathise, exploring the psychosocial sphere, carrying out shared decision-making, and asking open questions must be improved. Being a tutor, devoting more time to consultations, and being younger, results in a significant improvement in communication with the patient. Copyright © 2016 Elsevier España, S.L.U. All rights reserved.

  15. Biology, Ecology, and Management of an Invasive Stink Bug, Bagrada hilaris, in North America.

    Science.gov (United States)

    Palumbo, John C; Perring, Thomas M; Millar, Jocelyn G; Reed, Darcy A

    2016-01-01

    The painted bug, Bagrada hilaris, native to eastern and southern Africa and Asia, was detected in California in 2008, and it has spread rapidly throughout several southwestern US states. A polyphagous insect, it is particularly damaging to the billion dollar cole crop industry. B. hilaris frequently causes damage when it migrates to newly planted crops from weedy hosts. Feeding produces circular or star-shaped chlorotic lesions that become necrotic, and infested plants may be distorted. Currently, no reliable sampling methods for B. hilaris exist, nor are there effective natural enemies in the United States. Therefore, management has relied on multiple applications of insecticides and cultural practices such as removal of weedy hosts, destruction of crop residues, timing of planting, and use of transplants. Several pyrethroid and neonicotinoid insecticides are most effective for controlling the insect. Reliable sampling methods and further development of integrated pest management strategies to manage this invasive pest are urgently needed as its range continues to expand.

  16. Effective Bug Finding in C Programs with Shape and Effect Abstractions

    DEFF Research Database (Denmark)

    Abal, Iago; Brabrand, Claus; Wasowski, Andrzej

    2017-01-01

    Software projects tend to suffer from conceptually simple resource manipulation bugs, such as accessing a de-allocated memory region, or acquiring a non-reentrant lock twice. Static code scanners are used extensively to remove these bugs from projects like the Linux kernel. Yet, when the manipula......Software projects tend to suffer from conceptually simple resource manipulation bugs, such as accessing a de-allocated memory region, or acquiring a non-reentrant lock twice. Static code scanners are used extensively to remove these bugs from projects like the Linux kernel. Yet, when...... the Linux kernel. Our results show that our tool is more effective at finding bugs than similar code-scanning tools. EBA analyzes the drivers/ directory of Linux (nine thousand files) in less than thirty minutes, and uncovers a handful previously unknown double-lock bugs in various drivers....

  17. Los espacios de tutoría en práctica profesional y sus necesidades de fortalecimiento

    Directory of Open Access Journals (Sweden)

    Gerardo Ignacio Sánchez Sánchez

    2014-05-01

    Full Text Available El artículo da cuenta del funcionamiento de la tutoría en práctica profesional, según el reporte de los actores que viven el proceso: estudiantes de pedagogía en Educación Física, General Básica, Parvularia, Historia, Castellano, Matemática, Artes e Inglés de una institución formadora de profesores en la región del Maule, Chile y sus tutores. Participaron 225 estudiantes en práctica y 57 tutores universitarios; metodológicamente asume la modalidad de estudio descriptivo de caso múltiple. Los resultados indican opiniones bastante positivas respecto al sistema de acompañamiento diseñado por la universidad para los estudiantes en práctica profesional y que se concretan con la presencia de un profesional encargado de apoyar las exigencias personales, sociales y profesionales que experimentan los practicantes. Existe una alta valoración de la tutoría en tareas de apoyo a la planificación, la didáctica, la evaluación y la reflexión. Sin embargo, la visión que existe de los desempeños logrados tiende a ser distinta entre los actores. Los practicantes perciben un desempeño que, en términos generales, se sitúa en los niveles de “bastante” y “mucho”, lo cual indicaría que ellos consideran adquiridos los distintos desempeños pedagógicos; en tanto, los tutores sitúan a un porcentaje importante de practicantes en una adquisición más bien parcial o “regular” de los desempeños pedagógicos comprometidos en la formación de un profesor. The article is a report of the actors that have lived the process of practicum and their tutoring sessions. This involves students of pedagogy in physical education, basic general, preschool, history, Spanish, mathematics, arts and English, in a teacher training institution in the region of Maule, Chile and their tutors. 225 students in their practicum process and 57 college tutors participated in this work. The research was in the form of descriptive multiple case study. The

  18. Survey of Bartonella spp. in U.S. bed bugs detects Burkholderia multivorans but not Bartonella.

    Science.gov (United States)

    Saenz, Virna L; Maggi, Ricardo G; Breitschwerdt, Edward B; Kim, Jung; Vargo, Edward L; Schal, Coby

    2013-01-01

    Bed bugs (Cimex lectularius L.) have resurged in the United States and globally. Bed bugs are hematophagous ectoparasites of humans and other animals, including domestic pets, chickens, and bats, and their blood feeding habits contribute to their potential as disease vectors. Several species of Bartonella are re-emergent bacterial pathogens that also affect humans, domestic pets, bats and a number of other wildlife species. Because reports of both bed bugs and Bartonella have been increasing in the U.S., and because their host ranges can overlap, we investigated whether the resurgences of these medically important pathogens and their potential vector might be linked, by screening for Bartonella spp. in bed bugs collected from geographic areas where these pathogens are prevalent and from bed bugs that have been in culture in the laboratory for several years. We screened a total of 331 bed bugs: 316 bed bugs from 36 unique collections in 29 geographic locations in 13 states, 10 bed bugs from two colonies maintained in the laboratory for 3 yr, and 5 bed bugs from a colony that has been in culture since before the recent resurgence of bed bugs. Bartonella spp. DNA was screened using a polymerase chain reaction assay targeting the 16S-23S rRNA intergenic transcribed spacer region. Bartonella DNA was not amplified from any bed bug, but five bed bugs from four different apartments of an elderly housing building in North Carolina contained DNA sequences that corresponded to Burkholderia multivorans, an important pathogen in nosocomial infections that was not previously linked to an arthropod vector.

  19. Effects of Starvation on Deltamethrin Tolerance in Bed Bugs, Cimex lectularius L. (Hemiptera: Cimicidae

    Directory of Open Access Journals (Sweden)

    Zachary C. DeVries

    2015-01-01

    Full Text Available Bed bugs, Cimex lectularius L., are a major pest in the urban environment. Their presence often results in physical, psychological, and financial distress of homeowners and apartment dwellers. Although many insecticide bioassays have been performed on this pest, little attention has been paid to bed bug feeding status, which is closely linked to metabolism, molting, and mass. Therefore, we evaluated the toxicity of topically applied deltamethrin on insecticide susceptible adult male bed bugs fed 2 d, 9 d, and 21 d prior to testing. When toxicity was evaluated on a “per-bug” basis, there was no difference between 2 d [LD50 = 0.498 (0.316 − 0.692 ng·bug−1] and 9 d [LD50 = 0.572 (0.436 − 0.724 ng·bug−1] starved bugs, while 21 d starved bugs had a significantly lower LD50 [0.221 (0.075 − 0.386 ng·bug−1]. When toxicity was evaluated in terms of body mass, 9 d starved bugs had the highest LD50 values [0.138 (0.102 − 0.176 ng·mg−1], followed by 2 d starved bugs [0.095 (0.060 − 0.134 ng·mg−1], and then 21 d starved bugs [0.058 (0.019–0.102 ng·mg−1]; the LD50 values of 2 d and 9 d starved bugs were significantly different from 21 d starved bugs. These results indicate that feeding status plays an important role in the toxicity of deltamethrin. In addition, the lack of differences between 2 d and 9 d starved bugs indicate that the blood meal itself has little impact on tolerance, but rather it is some physiological change following feeding that confers increased tolerance to bed bugs.

  20. Survey of Bartonella spp. in U.S. bed bugs detects Burkholderia multivorans but not Bartonella.

    Directory of Open Access Journals (Sweden)

    Virna L Saenz

    Full Text Available Bed bugs (Cimex lectularius L. have resurged in the United States and globally. Bed bugs are hematophagous ectoparasites of humans and other animals, including domestic pets, chickens, and bats, and their blood feeding habits contribute to their potential as disease vectors. Several species of Bartonella are re-emergent bacterial pathogens that also affect humans, domestic pets, bats and a number of other wildlife species. Because reports of both bed bugs and Bartonella have been increasing in the U.S., and because their host ranges can overlap, we investigated whether the resurgences of these medically important pathogens and their potential vector might be linked, by screening for Bartonella spp. in bed bugs collected from geographic areas where these pathogens are prevalent and from bed bugs that have been in culture in the laboratory for several years. We screened a total of 331 bed bugs: 316 bed bugs from 36 unique collections in 29 geographic locations in 13 states, 10 bed bugs from two colonies maintained in the laboratory for 3 yr, and 5 bed bugs from a colony that has been in culture since before the recent resurgence of bed bugs. Bartonella spp. DNA was screened using a polymerase chain reaction assay targeting the 16S-23S rRNA intergenic transcribed spacer region. Bartonella DNA was not amplified from any bed bug, but five bed bugs from four different apartments of an elderly housing building in North Carolina contained DNA sequences that corresponded to Burkholderia multivorans, an important pathogen in nosocomial infections that was not previously linked to an arthropod vector.

  1. The odorant receptor co-receptor from the bed bug, Cimex lectularius L.

    Science.gov (United States)

    Hansen, Immo A; Rodriguez, Stacy D; Drake, Lisa L; Price, David P; Blakely, Brittny N; Hammond, John I; Tsujimoto, Hitoshi; Monroy, Erika Y; Maio, William A; Romero, Alvaro

    2014-01-01

    Recently, the bed bug, Cimex lectularius L. has re-emerged as a serious and growing problem in many parts of the world. Presence of resistant bed bugs and the difficulty to eliminate them has renewed interest in alternative control tactics. Similar to other haematophagous arthropods, bed bugs rely on their olfactory system to detect semiochemicals in the environment. Previous studies have morphologically characterized olfactory organs of bed bugs' antenna and have physiologically evaluated the responses of olfactory receptor neurons (ORNs) to host-derived chemicals. To date, odorant binding proteins (OBPs) and odorant receptors (ORs) associated with these olfaction processes have not been studied in bed bugs. Chemoreception in insects requires formation of heteromeric complexes of ORs and a universal OR coreceptor (Orco). Orco is the constant chain of every odorant receptor in insects and is critical for insect olfaction but does not directly bind to odorants. Orco agonists and antagonists have been suggested as high-value targets for the development of novel insect repellents. In this study, we have performed RNAseq of bed bug sensory organs and identified several odorant receptors as well as Orco. We characterized Orco expression and investigated the effect of chemicals targeting Orco on bed bug behavior and reproduction. We have identified partial cDNAs of six C. lectularius OBPs and 16 ORs. Full length bed bug Orco was cloned and sequenced. Orco is widely expressed in different parts of the bed bug including OR neurons and spermatozoa. Treatment of bed bugs with the agonist VUAA1 changed bed bug pheromone-induced aggregation behavior and inactivated spermatozoa. We have described and characterized for the first time OBPs, ORs and Orco in bed bugs. Given the importance of these molecules in chemoreception of this insect they are interesting targets for the development of novel insect behavior modifiers.

  2. Spatiotemporal patterns and dispersal of stink bugs (Heteroptera: Pentatomidae) in peanut-cotton farmscapes.

    Science.gov (United States)

    Tillman, P G; Northfield, T D; Mizell, R F; Riddle, T C

    2009-08-01

    In the southeast United States, a field of peanuts, Arachis hypogaea L., is often closely associated with a field of cotton, Gossypium hirsutum L. The objective of this 4-yr on-farm study was to examine and compare the spatiotemporal patterns and dispersal of the southern green stink bug, Nezara viridula L., and the brown stink bug, Euschistus servus (Say), in six of these peanut-cotton farmscapes. GS(+) Version 9 was used to generate interpolated estimates of stink bug density by inverse distance weighting. Interpolated stink bug population raster maps were constructed using ArcMap Version 9.2. This technique was used to show any change in distribution of stink bugs in the farmscape over time. SADIE (spatial analysis by distance indices) methodology was used to examine spatial aggregation of individual stink bug species and spatial association of the two stink bug species in the individual crops. Altogether, the spatiotemporal analyses for the farmscapes showed that some N. viridula and E. servus nymphs and adults that develop in peanuts disperse into cotton. When these stink bugs disperse from peanuts into cotton, they aggregate in cotton at the interface, or common boundary, of the two crops while feeding on cotton bolls. Therefore, there is a pronounced edge effect observed in the distribution of stink bugs as they colonize the new crop, cotton. The driving force for the spatiotemporal distribution and dispersal of both stink bug species in peanut-cotton farmscapes seems to be availability of food in time and space mitigated by landscape structure. Thus, an understanding of farmscape ecology of stink bugs and their natural enemies is necessary to strategically place, in time and space, biologically based management strategies that control stink bug populations while conserving natural enemies and the environment and reducing off-farm inputs.

  3. The odorant receptor co-receptor from the bed bug, Cimex lectularius L.

    Directory of Open Access Journals (Sweden)

    Immo A Hansen

    Full Text Available Recently, the bed bug, Cimex lectularius L. has re-emerged as a serious and growing problem in many parts of the world. Presence of resistant bed bugs and the difficulty to eliminate them has renewed interest in alternative control tactics. Similar to other haematophagous arthropods, bed bugs rely on their olfactory system to detect semiochemicals in the environment. Previous studies have morphologically characterized olfactory organs of bed bugs' antenna and have physiologically evaluated the responses of olfactory receptor neurons (ORNs to host-derived chemicals. To date, odorant binding proteins (OBPs and odorant receptors (ORs associated with these olfaction processes have not been studied in bed bugs. Chemoreception in insects requires formation of heteromeric complexes of ORs and a universal OR coreceptor (Orco. Orco is the constant chain of every odorant receptor in insects and is critical for insect olfaction but does not directly bind to odorants. Orco agonists and antagonists have been suggested as high-value targets for the development of novel insect repellents. In this study, we have performed RNAseq of bed bug sensory organs and identified several odorant receptors as well as Orco. We characterized Orco expression and investigated the effect of chemicals targeting Orco on bed bug behavior and reproduction. We have identified partial cDNAs of six C. lectularius OBPs and 16 ORs. Full length bed bug Orco was cloned and sequenced. Orco is widely expressed in different parts of the bed bug including OR neurons and spermatozoa. Treatment of bed bugs with the agonist VUAA1 changed bed bug pheromone-induced aggregation behavior and inactivated spermatozoa. We have described and characterized for the first time OBPs, ORs and Orco in bed bugs. Given the importance of these molecules in chemoreception of this insect they are interesting targets for the development of novel insect behavior modifiers.

  4. Qualitative Evaluation of the Java Intelligent Tutoring System

    Directory of Open Access Journals (Sweden)

    Edward Sykes

    2005-10-01

    Full Text Available In an effort to support the growing trend of the Java programming language and to promote web-based personalized education, the Java Intelligent Tutoring System (JITS was designed and developed. This tutoring system is unique in a number of ways. Most Intelligent Tutoring Systems require the teacher to author problems with corresponding solutions. JITS, on the other hand, requires the teacher to only supply the problem and problem specification. JITS is designed to "intelligently" examine the student's submitted code and determines appropriate feedback based on a number of factors such as JITS' cognitive model of the student, the student's skill level, and problem details. JITS is intended to be used by beginner programming students in their first year of College or University. This paper discusses the important aspects of the design and development of JITS, the qualitative methods and procedures, and findings. Research was conducted at the Sheridan Institute of Technology and Advanced Learning, Ontario, Canada.

  5. Managerial perceptions of mentor, lecturer practitioner and link tutor roles.

    Science.gov (United States)

    Carnwell, Ros; Baker, Sally-Ann; Bellis, Mike; Murray, Ruth

    2007-11-01

    Educating pre-registration nurses in clinical practice is a global issue. Within different countries problems exist in educating and supervising students in clinical practice and various models of clinical education are employed. In Wales, United Kingdom, this responsibility is divided between mentors, lecturer practitioners and link tutors. This paper reports on the third phase of a three-phase study in Wales to explore differences between mentors, lecturer practitioners and link tutors, and how they work together to assist students to integrate theory and practice. Four focus group interviews of National Health Service managers and Higher Education managers (n=22) were conducted. Qualitative content analysis revealed four themes: role characteristics and competencies, role differences, role conflict, and future options. The findings suggest a theory-practice continuum along which mentors, lecturer practitioners and link tutors occupy different positions. The article explores these different positions and offers suggestions for future role development.

  6. Enhancing Astronomy Education Through Cross-Age Student Tutoring

    Science.gov (United States)

    Grundstrom, Erika; Taylor, R. S.

    2009-01-01

    Vast distances, such as those that pervade astronomy, are difficult concepts to grasp. We are all a part of the Earth-Moon system, however most people do not comprehend the sizes and distances involved. In a pilot study, the authors found that an intervention using both discussion and kinesthetic modeling resulted in students of all ages (children up through adults) acquiring a more accurate mental representation of the Earth-Moon system. We have extended this research and are currently conducting a new study in which undergraduate students serve as "tutors" in a public observatory setting. One of our conjectures is that tutors' mental representations of the Earth-Moon system will be enhanced through their active participation in the cross-age peer tutoring activity. This work is supported in part by grants from the Center for the Integration of Research, Teaching, and Learning (CIRTL), the Vanderbilt University Learning Sciences Institute, and NSF Career grant AST-0349075.

  7. Motivational and metacognitive feedback in SQL-Tutor*

    Science.gov (United States)

    Hull, Alison; du Boulay, Benedict

    2015-04-01

    Motivation and metacognition are strongly intertwined, with learners high in self-efficacy more likely to use a variety of self-regulatory learning strategies, as well as to persist longer on challenging tasks. The aim of the research was to improve the learner's focus on the process and experience of problem-solving while using an Intelligent Tutoring System (ITS) and including motivational and metacognitive feedback based on the learner's past states and experiences. An existing ITS, SQL-Tutor, was used with first-year undergraduates studying a database module. The study used two versions of SQL-Tutor: the Control group used a base version providing domain feedback and the Study group used an extended version that also provided motivational and metacognitive feedback. This paper summarises the pre- and post-process results. Comparisons between groups showed some differing trends both in learning outcomes and behaviour in favour of the Study group.

  8. Pengembangan Instrumen Analisis Kompetensi Tutor Pendidikan Anak Usia Dini (PAUD

    Directory of Open Access Journals (Sweden)

    Agus Tiyono Teguh Maryanto

    2005-12-01

    Full Text Available Penelitian ini bertujuan: (1 mengidentifikasi standar kompetensi dan indikator yang dapat dijadikan tolok ukur untuk menyusun standar kompetensi tutor PAUD, dan (2 mengembangkan instrumen untuk uji kompetensi tutor PAUD yang tepat dan handal berdasarkan indikator kompetensi yang telah tersusun. Penelitian ini merupakan penelitian pengembangan yang terdiri dari dua tahap yaitu tahap, pengembangan standar kompetensi dan pengembangan instrumen uji kompetensi tutor PAUD. Teknik pengumpulan data yang digunakan adalah focus group discussion ( FGD dan teknik Delphi 2 x putaran. Subjek uji coba adalah 110 orang tutor yang mengikuti Pelatihan Tenaga Pendidik PAUD Tingkat Provinsi Jawa Tengah Tahun 2004. Subjek uji coba instrumen pertama sebanyak 20 orang dari Kabupaten Magelang, dan subjek uji coba instrumen kedua sebanyak 32 orang dari Salatiga, Kota Magelang, dan Kabupaten Magelang. Temuan penelitian ada dua. (1 standar kompetensi tutor PAUD terdiri atas 4 dimensi dan 50 indikator, meliputi dimensi personal, dimensi sosial, dimensi profesional, dan dimensi akademik; (2 instrumen untuk menguji kompetensi yang berupa inventori tes dengan indeks validitas berupa angka muatan faktor terendah di atas 0,300 (kriteria yang telah ditetapkan. Koefisien reliabilitas tiap faktor pada uji coba pertama adalah . 0,879 dan tertinggi 0,984, sedangkan koefisien reliabilitas tiap faktor pada uji coba kedua terendah 0,889 dan tertinggi 0,995, telah melebihi syarat minimal untuk pengukuran kelompok yaitu 0,65. Koefisien reliabilitas tes uraian ditentukan dengan reliabilitas antar-rater dengan teknik ANAVA, dan diperoleh koefisien reliabilitas dari 3 orang penilai yaitu 0,957, sedangkan estimasi untuk seorang penilai adalah 0,881. Kata kunci: pengembangan instrumen, anahsis kompetensi, tutor paud

  9. A methodology for quantitatively managing the bug fixing process using Mahalanobis Taguchi system

    Directory of Open Access Journals (Sweden)

    Boby John

    2015-12-01

    Full Text Available The controlling of bug fixing process during the system testing phase of software development life cycle is very important for fixing all the detected bugs within the scheduled time. The presence of open bugs often delays the release of the software or result in releasing the software with compromised functionalities. These can lead to customer dissatisfaction, cost overrun and eventually the loss of market share. In this paper, the authors propose a methodology to quantitatively manage the bug fixing process during system testing. The proposed methodology identifies the critical milestones in the system testing phase which differentiates the successful projects from the unsuccessful ones using Mahalanobis Taguchi system. Then a model is developed to predict whether a project is successful or not with the bug fix progress at critical milestones as control factors. Finally the model is used to control the bug fixing process. It is found that the performance of the proposed methodology using Mahalanobis Taguchi system is superior to the models developed using other multi-dimensional pattern recognition techniques. The proposed methodology also reduces the number of control points providing the managers with more options and flexibility to utilize the bug fixing resources across system testing phase. Moreover the methodology allows the mangers to carry out mid- course corrections to bring the bug fixing process back on track so that all the detected bugs can be fixed on time. The methodology is validated with eight new projects and the results are very encouraging.

  10. Moving From the Old to the New: Insecticide Research on Bed Bugs since the Resurgence

    Directory of Open Access Journals (Sweden)

    Alvaro Romero

    2011-05-01

    Full Text Available The scarcity of bed bugs in many countries over the last 50 years has resulted in a lack of modern research into the toxicology of this pest. Although bed bugs resurged in the late 1990s, published research related to insecticides has lagged behind and only began to appear in 2006. The difficulty in controlling bed bugs triggered the interest of both private and academic sectors to determine the value of currently available insecticides. What follows, is updated information on effectiveness of products, studies on insecticide susceptibility, identification of mechanisms of insecticide resistance and chemical strategies proposed to overcome resistance in modern bed bug populations.

  11. Rapid killing of bed bugs (Cimex lectularius L.) on surfaces using heat: application to luggage.

    Science.gov (United States)

    Loudon, Catherine

    2017-01-01

    The resistance of bed bugs (Cimex lectularius L.) to chemical insecticides has motivated the development of non-chemical control methods such as heat treatment. However, because bed bugs tend to hide in cracks or crevices, their behavior incidentally generates a thermally insulated microenvironment for themselves. Bed bugs located on the outer surface of luggage are less insulated and potentially more vulnerable to brief heat treatment. Soft-sided suitcases with adult male bed bugs on the outside were exposed to an air temperature of 70-75 °C. It took 6 min to kill all of the bed bugs, even those that had concealed themselves under zipper flaps or decorative piping. During heating, only one bed bug (out of 250 in total) moved into the luggage (through a closed zipper). Over long periods of time (24 h) at room temperature, adult male bed bugs on the exterior of luggage only infrequently moved inside; only 3% (5/170) had moved inside during 24 h. Brief exterior heat treatment of luggage is a promising way to reduce the spread of bed bugs being transported on the outer surface of luggage. This treatment will not kill bed bugs inside the luggage, but could be a component of integrated management for this pest. © 2016 Society of Chemical Industry. © 2016 Society of Chemical Industry.

  12. Efficacy of commercially available ultrasonic pest repellent devices to affect behavior of bed bugs (Hemiptera: Cimicidae).

    Science.gov (United States)

    Yturralde, K M; Hofstetter, R W

    2012-12-01

    Little is known about the potential for acoustic communication in bed bugs, Cimex lectularius L. (Hemiptera: Cimicidae), or the use of sound as cues in host location, although many hemipterans are known to communicate with sound. Most behavioral research has focused on bed bug pheromones that are used in aggregation and as alarm signals. We investigated the influence of sound as a deterrent and as an attractant, either of which could ultimately be used to monitor and control bed bugs. Female bed bugs were tested in two-choice tests with four different commercially available ultrasonic repellent devices. We found that female bed bugs were equally likely to occur in arenas with or without sound produced by ultrasonic devices. These devices did not repel or attract bed bugs during choice trials. However, more bed bugs preferred the middle corridor between the test (sound) and control (no sound) arenas when the sound devices were played. Bed bugs were also more likely to exit the middle corridor during control trials compared with treatment trials with ultrasonic devices. Our results confirm that commercial devices producing ultrasound are not a promising tool for repelling bed bugs.

  13. Entrapment of bed bugs by leaf trichomes inspires microfabrication of biomimetic surfaces.

    Science.gov (United States)

    Szyndler, Megan W; Haynes, Kenneth F; Potter, Michael F; Corn, Robert M; Loudon, Catherine

    2013-06-06

    Resurgence in bed bug infestations and widespread pesticide resistance have greatly renewed interest in the development of more sustainable, environmentally friendly methods to manage bed bugs. Historically, in Eastern Europe, bed bugs were entrapped by leaves from bean plants, which were then destroyed; this purely physical entrapment was related to microscopic hooked hairs (trichomes) on the leaf surfaces. Using scanning electron microscopy and videography, we documented the capture mechanism: the physical impaling of bed bug feet (tarsi) by these trichomes. This is distinct from a Velcro-like mechanism of non-piercing entanglement, which only momentarily holds the bug without sustained capture. Struggling, trapped bed bugs are impaled by trichomes on several legs and are unable to free themselves. Only specific, mechanically vulnerable locations on the bug tarsi are pierced by the trichomes, which are located at effective heights and orientations for bed bug entrapment despite a lack of any evolutionary association. Using bean leaves as templates, we microfabricated surfaces indistinguishable in geometry from the real leaves, including the trichomes, using polymers with material properties similar to plant cell walls. These synthetic surfaces snag the bed bugs temporarily but do not hinder their locomotion as effectively as real leaves.

  14. Moving From the Old to the New: Insecticide Research on Bed Bugs since the Resurgence.

    Science.gov (United States)

    Romero, Alvaro

    2011-05-05

    The scarcity of bed bugs in many countries over the last 50 years has resulted in a lack of modern research into the toxicology of this pest. Although bed bugs resurged in the late 1990s, published research related to insecticides has lagged behind and only began to appear in 2006. The difficulty in controlling bed bugs triggered the interest of both private and academic sectors to determine the value of currently available insecticides. What follows, is updated information on effectiveness of products, studies on insecticide susceptibility, identification of mechanisms of insecticide resistance and chemical strategies proposed to overcome resistance in modern bed bug populations.

  15. Sistema inteligente para evaluación de programas tutores

    Directory of Open Access Journals (Sweden)

    Luz Daicy Alvarado

    2011-02-01

    Full Text Available The evaluating system we show in this paper is part of a project that ties to develop a computer asisted teaching system based on inteligent tutoring. We pretends this mechanism based in automatic learning tools. have the capacity for capturing a image that reflect the subject comprehension degree by the student and identify the aspects where the student have problems. With this information the tutor will be feedbacking so he can to take a decission about the educational strategy to follow.

  16. Distance learning for training business game tutors

    Directory of Open Access Journals (Sweden)

    Mariana de Toledo Marinho

    Full Text Available Abstract This work is the result of research that proposes the incorporation of Distance Learning into a Business Game as a strategy to enhance tutor training, considering entrepreneurship difficulties faced by public school teachers. Part of the problem could be attributed to subject type, because, in general, it is not common to find entrepreneurship on school curricula. The Distance Learning (DL activities were developed using the Moodle platform and structured by topic to increase educational flexibility and achieve a better balance between individual reflection and online discussion. It was developed in four steps: course content development; course evaluation by computer technicians; restructuring the course based on course evaluation done by computer technicians and course evaluation by teachers from the public school system. A preliminary test was performed with informatics technicians to technically evaluate the learning environment. Based on this, the course was restructured, applying corrections and adjustments to improve environment usability. After corrections, a final test was conducted with public school system teachers to analyze user perception, which gave a positive result. Virtual learning environment evaluation is complex and multidisciplinary, requiring the technical knowledge of internet programming and a conceptual knowledge of education, especially in the field of learning. When the evaluation done by teachers was examined, it was found that deficiencies pointed out by computer technicians had been resolved, giving a positive rating. This current research concludes that DL can improve the use of games, because it is possible to structure the content related to the learning gaps of specific groups of students. In this respect the use of games results can guide the development of content.

  17. eBug--teaching children hygiene principles using educational games.

    Science.gov (United States)

    Kostkova, Patty; Farrell, David; de Quincey, Ed; Weinberg, Julius; Lecky, Donna; McNulty, Cliodna

    2010-01-01

    Technology enhanced education has been recently established as a new approach for all stages of education. However, among these new IT media it is computer games playing the central role in delivering education in particular to children and teenagers, however, real world sound evaluation is often given little attention. The EU funded e-Bug project developed web games aimed at children to teach basic principles of prudent antibiotics use, hand and respiratory hygiene and aims to reinforces an awareness of microbes, hand and respiratory hygiene among junior and senior school children in 10 countries in Europe. An educational pack implemented in schools across Europe is complemented by Internet web games for two age groups teaching a set of learning objectives (LOs) using a fast and interactive platform game design for junior children and investigate detective games based on PBL principles for senior children. In this paper, we present the design of e-Bug junior and senior games and evaluation results.

  18. To what extent do tutor-related behaviours influence student learning in PBL?

    Science.gov (United States)

    Chng, Esther; Yew, Elaine H J; Schmidt, Henk G

    2015-03-01

    The purpose of this study was to investigate how tutor behaviours influence learning in problem-based learning (PBL). A previous study had indicated a significant influence of the tutor's social congruent behaviour on the PBL process and this study further investigates this finding by examining two groups of tutors displaying differences in social congruence. The participants were 77 students under the tutelage of four tutors and a self-report questionnaire ranked two tutors to be more socially congruent as compared to the other two. Student learning was measured by a concept recall test and the results from the analysis of covariance indicated a significant impact of the tutor's social congruent behaviour on learning after the problem analysis phase but not on the self-directed learning and reporting phases. It was concluded that the academic abilities of students and the small number of tutors involved may have affected the results, which led to the second part of this study. A group of 11 tutors were selected and the impact of their behaviours on student achievement measured by the module grade was examined. Results indicated that the tutor behaviours had a greater influence on average students as compared to the academically stronger and weaker students. This finding suggests that students who are academically stronger are not as reliant on the tutor while average students may depend more on the tutor to guide and motivate them in order to achieve the learning goals.

  19. No sex-related differences in mortality in bed bugs (Hemiptera: Cimicidae) exposed to deltamethrin, and surviving bed bugs can recover.

    Science.gov (United States)

    Feldlaufer, Mark F; Ulrich, Kevin R; Kramer, Matthew

    2013-04-01

    Exposure of a pyrethroid-susceptible strain of bed bugs, Cimex lectularius L. (Hemiptera: Cimicidae) to varying concentrations of deltamethrin for 24 h indicated no significant difference in mortality between males, females, and nymphs at 24 nor at 168 h postexposure when bed bugs were removed to untreated surfaces at 24 h. In addition, many bed bugs classified as morbid or moribund at 24 h and removed to untreated surfaces at this time, recovered by 336 h (2 wk) and were capable of feeding when given the opportunity. Adult female bed bugs that survived were able to lay eggs and the resulting nymphs blood-fed. By contrast, all bed bugs classified as morbid or moribund at 24 h that remained on deltamethrin-treated surfaces for 336 h either died or were still classified as morbid or moribund at the end of this time. No bed bugs classified as morbid or moribund blood-fed when given the opportunity at 2 wk, regardless of whether they remained on the treated surfaces or were removed to untreated surfaces. A power analysis demonstrated we would have detected even moderate differences in mortality between males and females, had differences existed. Therefore, using males exclusively in efficacy assays is a suitable strategy to preserve females for laboratory colony purposes. Results also indicated there is little reason to assess efficacy beyond 1 wk, even when bed bugs are exposed for only 24 h.

  20. Comparison of a web-based package with tutor-based methods of teaching respiratory medicine: subjective and objective evaluations

    Directory of Open Access Journals (Sweden)

    Partridge Martyn R

    2007-11-01

    Full Text Available Abstract Background Respiratory disease is a major cause of morbidity and mortality not only in the United Kingdom, but globally. A good understanding of respiratory disease and its treatment is essential for all medical graduates. As a result of changes in clinical practice, patients with some common respiratory illnesses are less often admitted to hospital, restricting the experience available to undergraduate students. Combined with a potential shortage of clinical teachers, this means that new methods of teaching need to be developed and appraised. The aim of this study was to establish whether a web-based package on the diagnosis of respiratory disease would be as effective and as acceptable to final year medical students as tutor-led methods of teaching the same material. Methods 137 out of 315 final year undergraduate students in a single medical school volunteered to take part. Each received up to two hours of tutor-lead interactive, tutor-lead didactic or electronic, Web-based teaching on the accurate diagnosis and management of respiratory disease. Post teaching performance was assessed by multiple true/false questions and data interpretation exercises, whilst students' teaching preferences were assessed by questionnaire. Results Despite a high knowledge baseline before the study, there was a small, but statistically significant increase in knowledge score after all forms of teaching. Similarly, data interpretation skills improved in all groups, irrespective of teaching format, Although paradoxically most students expressed a preference for interactive tutor-lead teaching, spirometry interpretation in those receiving web-based teaching improved significantly more [p = 0.041] than in those in the interactive group. Conclusion Web-based teaching is at least as good as other teaching formats, but we need to overcome students' reluctance to engage with this teaching method.

  1. Lecturing skills as predictors of tutoring skills in a problem-based medical curriculum

    Directory of Open Access Journals (Sweden)

    Kassab SE

    2016-01-01

    Full Text Available Salah Eldin Kassab,1 Nahla Hassan,1 Marwan F Abu-Hijleh,2 Reginald P Sequeira3 1Department of Medical Education, Faculty of Medicine, Suez Canal University, Ismailia, Egypt; 2College of Medicine, Qatar University, Doha, Qatar; 3College of Medicine and Medical Sciences, Arabian Gulf University, Manama, Kingdom of Bahrain Purpose: Recruitment of tutors to work in problem-based learning (PBL programs is challenging, especially in that most of them are graduated from discipline-based programs. Therefore, this study aims at examining whether lecturing skills of faculty could predict their PBL tutoring skills. Methods: This study included evaluation of faculty (n=69 who participated in both tutoring and lecturing within particular PBL units at the College of Medicine and Medical Sciences (CMMS, Arabian Gulf University, Bahrain. Each faculty was evaluated by medical students (n=45±8 for lecturing and 8±2 for PBL tutoring using structured evaluation forms based on a Likert-type scale (poor to excellent. The prediction of tutoring skills using lecturing skills was statistically analyzed using stepwise linear regression. Results: Among the parameters used to judge lecturing skills, the most important predictor for tutoring skills was subject matter mastery in the lecture by explaining difficult concepts and responding effectively to students' questions. Subject matter mastery in the lecture positively predicted five tutoring skills and accounted for 25% of the variance in overall effectiveness of the PBL tutors (F=22.39, P=0.000. Other important predictors for tutoring skills were providing a relaxed class atmosphere and effective use of audiovisual aids in the lecture. Conclusion: Predicting the tutoring skills based on lecturing skills could have implications for recruiting tutors in PBL medical programs and for tutor training initiatives. Keywords: PBL, tutor, tutoring skills, lecturing skills

  2. A "bug-in-the-eye" can be better than a "bug-in-the-ear". A teleprompter technique for on-line therapy skills training.

    Science.gov (United States)

    Klitzke, M J; Lombardo, T W

    1991-01-01

    The only existing method of therapy supervision that provides on-line feedback to trainees is the "bug-in-the-ear," an auditory communication system. Although this system has several advantages over supervision strategies that use retrospective accounts, audio- and videotapes, and direct observation on sessions, it is disruptive to the trainee and must be limited to strategically timed three- or four-word communications. We describe and discuss advantages of the "bug-in-the-eye," an alternative to the bug-in-the-ear, which provides visual on-line feedback for therapist skill training.

  3. Attraction of harlequin bug (Hemiptera: Pentatomidae) to male-produced pheromone and host plants in the field

    Science.gov (United States)

    The harlequin bug is a serious stink bug pest of cruciferous vegetables. New tools are needed for vegetable growers to manage this pest with reduced or no pesticide inputs. We investigated attractants for harlequin bugs as part of a larger project to develop new traps or trap crops to manage this ...

  4. The Franchising of Private Tutoring: A View from Canada

    Science.gov (United States)

    Davies, Scott; Aurini, Janice

    2006-01-01

    Private tutoring is a growing industry that is being transformed by an evolution from "shadow education" provision into "learning center" franchises. Traditional shadow educators closely follow the school curriculum, offering short-term homework help and test preparation. Learning centers develop their own curricular and…

  5. Development of a personal-computer-based intelligent tutoring system

    Science.gov (United States)

    Mueller, Stephen J.

    1988-01-01

    A large number of Intelligent Tutoring Systems (ITSs) have been built since they were first proposed in the early 1970's. Research conducted on the use of the best of these systems has demonstrated their effectiveness in tutoring in selected domains. A prototype ITS for tutoring students in the use of CLIPS language: CLIPSIT (CLIPS Intelligent Tutor) was developed. For an ITS to be widely accepted, not only must it be effective, flexible, and very responsive, it must also be capable of functioning on readily available computers. While most ITSs have been developed on powerful workstations, CLIPSIT is designed for use on the IBM PC/XT/AT personal computer family (and their clones). There are many issues to consider when developing an ITS on a personal computer such as the teaching strategy, user interface, knowledge representation, and program design methodology. Based on experiences in developing CLIPSIT, results on how to address some of these issues are reported and approaches are suggested for maintaining a powerful learning environment while delivering robust performance within the speed and memory constraints of the personal computer.

  6. Towards a Collaborative Intelligent Tutoring System Classification Scheme

    Science.gov (United States)

    Harsley, Rachel

    2014-01-01

    This paper presents a novel classification scheme for Collaborative Intelligent Tutoring Systems (CITS), an emergent research field. The three emergent classifications of CITS are unstructured, semi-structured, and fully structured. While all three types of CITS offer opportunities to improve student learning gains, the full extent to which these…

  7. Emotion Elicitation in a Socially Intelligent Service: The Typing Tutor

    Directory of Open Access Journals (Sweden)

    Andrej Košir

    2017-03-01

    Full Text Available This paper presents an experimental study on modeling machine emotion elicitation in a socially intelligent service, the typing tutor. The aim of the study is to evaluate the extent to which the machine emotion elicitation can influence the affective state (valence and arousal of the learner during a tutoring session. The tutor provides continuous real-time emotion elicitation via graphically rendered emoticons, as an emotional feedback to learner’s performance. Good performance is rewarded by the positive emoticon, based on the notion of positive reinforcement. Facial emotion recognition software is used to analyze the affective state of the learner for later evaluation. Experimental results show the correlation between the positive emoticon and the learner’s affective state is significant for all 13 (100% test participants on the arousal dimension and for 9 (69% test participants on both affective dimensions. The results also confirm our hypothesis and show that the machine emotion elicitation is significant for 11 (85% of 13 test participants. We conclude that the machine emotion elicitation with simple graphical emoticons has a promising potential for the future development of the tutor.

  8. Crossing Campuses: Level 3 Tutor Visits and Vocational Progression

    Science.gov (United States)

    Thomas, Kate; Waring, Ruth

    2012-01-01

    This article focuses on a Western Vocational Lifelong Learning Network (WVLLN) initiative aimed at supporting Level 3 vocational tutors in further education (FE) who have moved into a teaching career via professional experience rather than through higher education (HE), but who play a significant role in advising young people about progression to…

  9. Effectiveness of Cognitive Tutor Algebra I at Scale

    Science.gov (United States)

    Pane, John F.; Griffin, Beth Ann; McCaffrey, Daniel F.; Karam, Rita

    2014-01-01

    This article examines the effectiveness of a technology-based algebra curriculum in a wide variety of middle schools and high schools in seven states. Participating schools were matched into similar pairs and randomly assigned to either continue with the current algebra curriculum for 2 years or to adopt Cognitive Tutor Algebra I (CTAI), which…

  10. Information Environment of Tutors in Public Secondary Schools in ...

    African Journals Online (AJOL)

    online environment shapes their information seeking behavior and was main avenue through ... The society exists with various classes and groups of individuals such as farmers, tutors, civil ... organization they work for, by the nature of their work or profession, by age sex or other social .... Buying newspapers / magazines.

  11. Examination of Pre-Service Teacher's Training through Tutoring Approach

    Science.gov (United States)

    Wu, Hsiao-ping; Guerra, Myriam Jimena

    2017-01-01

    Pre-service teacher preparation in the United States is becoming progressively more challenging with respect to the demands on teachers. This study examined the impact of tutoring approach on pre-service teachers? skills to work with English language learners through a qualitative research design. Content analysis was used at the thematic level on…

  12. Collaboration and peer tutoring in chemistry laboratory education

    NARCIS (Netherlands)

    Ding, N.; Harskamp, E.G.

    2011-01-01

    The aim of this study is to examine the effectiveness of collaborative learning with hints and peer tutoring with hints, and individual learning with hints in chemistry laboratory education in a secondary school. A total of 96 eleventh graders participated in this study. The study has a randomized p

  13. The Challenges of Becoming Tutors at Electronic Environments

    Directory of Open Access Journals (Sweden)

    María Eugenia López Hurtado

    2014-07-01

    Full Text Available This paper presents a research report of my own experience as a tutor in electronic environments which I have accumulated throughout the guidance for English learners of basic level at a public university. This article looks for illustrating the researcher's own perceptions and challenges as becoming an e-tutor. Therefore, I will introduce an overview of studies and experiences that address this issue in international contexts, and then I will refer to my own experience where I describe the roles that emerged while I was administrating and delivering e- learning pedagogical experiences such as an exploration of some skills and learning activities carried out in an English course; this description embraces three different stages (before, during and after of implementation. Subsequently, some discussion of the results is provided gathered from the research instruments I used. Finally, some conclusions and suggestions are provided in regards to the research question of the study, its outcomes on how tutors' challenges shape tutor's roles in electronic environments.

  14. Tutoring the Elderly on the Use of Recommending Systems

    Science.gov (United States)

    Savvopoulos, Anastasios; Virvou, Maria

    2010-01-01

    Purpose: The elderly are often unfamiliar with computer technology and can encounter great difficulties. Moreover, the terms used in such systems may prove to be a challenge for these users. The aim of this research is to tutor the elderly on using an adaptive e-shop system in order to buy products easily. Design/methodology/approach: In view of…

  15. Tutored Videotape-Instruction in Clinical Decision-Making.

    Science.gov (United States)

    Sox, Harold C.; And Others

    1984-01-01

    A comparison of traditional medical lecturing with a technique using a videotaped lecture that can be interrupted by a tutor for discussion or questions showed similar academic achievement rates but higher student ratings for the videotape method. The technique is recommended for specialized topics or areas in which the supply of expert lecturers…

  16. Tutoring the Elderly on the Use of Recommending Systems

    Science.gov (United States)

    Savvopoulos, Anastasios; Virvou, Maria

    2010-01-01

    Purpose: The elderly are often unfamiliar with computer technology and can encounter great difficulties. Moreover, the terms used in such systems may prove to be a challenge for these users. The aim of this research is to tutor the elderly on using an adaptive e-shop system in order to buy products easily. Design/methodology/approach: In view of…

  17. Exploring the personal tutor-student relationship: an autoethnographic approach.

    Science.gov (United States)

    Gardner, L D; Lane, H

    2010-05-01

    In this paper, my personal student Hannah and I narrate an account of aspects of our tutor/student relationship, features of which we consider to have wider relevance to others who occupy similar roles. The decision that we should write about our experience as personal tutor and student was one that emerged rather than was deliberately taken, and that we should write it as an autoethnography similarly became apparent. We had things to say, and wanted to present them in a style that mirrored the multifaceted relationship that developed, and which we continue to cultivate as evidenced by the writing of this piece. We suggest that the roles and relationships explored here extend beyond tutor and student boundaries, and have relevance to nurse and service-user encounters which we demonstrate through the use of particular frameworks for the analysis of our autoethnographic account. We explore these narratives of our relationship by utilizing concepts such as, 'boundaries', 'learning', 'supervision' and 'therapy'. In doing so, a shape of personal tutoring emerges which in turn may serve as a valuable teaching technique within mental health nurse education.

  18. Analysing Student Programs in the PHP Intelligent Tutoring System

    Science.gov (United States)

    Weragama, Dinesha; Reye, Jim

    2014-01-01

    Programming is a subject that many beginning students find difficult. The PHP Intelligent Tutoring System (PHP ITS) has been designed with the aim of making it easier for novices to learn the PHP language in order to develop dynamic web pages. Programming requires practice. This makes it necessary to include practical exercises in any ITS that…

  19. Tutoring and Multi-Agent Systems: Modeling from Experiences

    Science.gov (United States)

    Bennane, Abdellah

    2010-01-01

    Tutoring systems become complex and are offering varieties of pedagogical software as course modules, exercises, simulators, systems online or offline, for single user or multi-user. This complexity motivates new forms and approaches to the design and the modelling. Studies and research in this field introduce emergent concepts that allow the…

  20. A Micro-Computer Based Tutor for Teaching Arithmetic Skills.

    Science.gov (United States)

    Attisha, M.; Yazdani, M.

    1983-01-01

    Describes a knowledge-based tutoring system which provides pupil interaction with the microcomputer to diagnose pupils' errors in subtraction operations. Current subtraction methods; nature and origin of subtraction errors; and the structure, achievements, and future developments of the computer system are included. Thirteen references and a…

  1. The Acceptability and Efficacy of an Intelligent Social Tutoring System

    Science.gov (United States)

    Sanchez, Rebecca Polley; Bartel, Chelsea M; Brown, Emily; DeRosier, Melissa

    2014-01-01

    This study tested the acceptability and efficacy of an innovative intelligent tutoring system (ITS), "Adventures Aboard the S.S. GRIN," that translates the evidence-based in-person Social Skills Group Intervention (SSGRIN), into an interactive game-based social tutorial. This randomized controlled pilot trial tested the first half of the…

  2. Collaboration and peer tutoring in chemistry laboratory education

    NARCIS (Netherlands)

    Ding, N.; Harskamp, E.G.

    2011-01-01

    The aim of this study is to examine the effectiveness of collaborative learning with hints and peer tutoring with hints, and individual learning with hints in chemistry laboratory education in a secondary school. A total of 96 eleventh graders participated in this study. The study has a randomized

  3. Optimizing Knowledge Sharing in Learning Networks through Peer Tutoring

    NARCIS (Netherlands)

    Hsiao, Amy; Brouns, Francis; Kester, Liesbeth; Sloep, Peter

    2009-01-01

    Hsiao, Y. P., Brouns, F., Kester, L., & Sloep, P. (2009). Optimizing Knowledge Sharing in Learning Networks through Peer Tutoring. Presentation at the IADIS international conference on Cognition and Exploratory in Digital Age (CELDA 2009). November, 20-22, 2009, Rome, Italy.

  4. Optimizing Knowledge Sharing In Learning Networks Through Peer Tutoring

    NARCIS (Netherlands)

    Hsiao, Amy; Brouns, Francis; Kester, Liesbeth; Sloep, Peter

    2009-01-01

    Hsiao, Y. P., Brouns, F., Kester, L., & Sloep, P. B. (2009). Optimizing Knowledge Sharing In Learning Networks Through Peer Tutoring. In D. Kinshuk, J. Sampson, J. Spector, P. Isaías, P. Barbosa & D. Ifenthaler (Eds.). Proceedings of IADIS International Conference Cognition and Exploratory Learning

  5. Language Repair Strategies in Bilingual Tutoring of Mathematics Word Problems

    Science.gov (United States)

    Oliveira, Alandeom W.; Meskill, Carla; Judson, Darlene; Gregory, Karen; Rogers, Patterson; Imperial, Christopher J.; Casler-Failing, Shelli

    2015-01-01

    This study explores the "language repair strategies" (aimed at repairing communication problems) of two bilingual speakers during mathematics word problem tutoring sessions. Bilingual repair was shown to gradually shift from a linguistic to an epistemic focus during problem solving (i.e., communication became more conceptually focused…

  6. Bringing a Lemon to a Lifer: Tutoring in Prison

    Science.gov (United States)

    Page, Mich

    2009-01-01

    This prison-based research is grounded upon "reflection-in-action", intertwining the accounts of a reflective prisoner and a reflective practitioner. Through use of ethnographic methods it seeks to make sense of the contradictions encountered while tutoring prisoners. The research story shows how meaning conflicts have been negotiated,…

  7. The Impact of an Online Tutoring Program on Mathematics Achievement

    Science.gov (United States)

    Clark, Amy K.; Whetstone, Patti

    2014-01-01

    The authors explored the impact of an online tutoring program, Math Whizz (Whizz Education, 2014), on student mathematics achievement at 15 elementary schools. Students participated in the use of the Math Whizz program for the duration of the school year as a supplement to mathematics instruction. The Math Whizz program recorded such information…

  8. Improved Modeling of Intelligent Tutoring Systems Using Ant Colony Optimization

    Science.gov (United States)

    Rastegarmoghadam, Mahin; Ziarati, Koorush

    2017-01-01

    Swarm intelligence approaches, such as ant colony optimization (ACO), are used in adaptive e-learning systems and provide an effective method for finding optimal learning paths based on self-organization. The aim of this paper is to develop an improved modeling of adaptive tutoring systems using ACO. In this model, the learning object is…

  9. Recorded Readings: A Taped Parent-Tutoring Intervention

    Science.gov (United States)

    Kupzyk, Sara; McCurdy, Merilee; Hofstadter, Kristi L.; Berger, Laura

    2011-01-01

    Parent tutoring has been successfully used to increase children's oral reading fluency. However, commonly used procedures pose a challenge for parents who are not proficient in reading or who speak English as a second language. A taped reading program that included listening passage preview, repeated reading, and performance feedback was developed…

  10. Nursing students' perceptions of effective problem-based learning tutors.

    Science.gov (United States)

    Matthew-Maich, Nancy; Martin, Lynn; Hammond, Cynthia; Palma, Amy; Pavkovic, Maria; Sheremet, Darlene; Roche, Carmen

    2016-11-16

    Aim To explore baccalaureate nursing students' perceptions of what makes an effective tutor in problem-based learning courses, and the influence of effective teaching on students' learning and experience. Method Students enrolled in all four years of a baccalaureate nursing programme completed online surveys (n=511) and participated in focus groups (n=19). Data were analysed and combined using content analysis. Findings The data were summarised using five themes, the '5 Ps' of effective teaching in problem-based learning. Nursing students perceived effective problem-based learning tutors to be prepared with knowledge and facilitation skills, person-centred, passionate, professional and able to prepare students for success in the nursing programme. Effective tutors adjusted their approaches to students throughout the four years of the nursing programme. Conclusion Effective teaching in problem-based learning is essential and has significant effects on nursing students' learning, motivation and experience. Important attributes, skills and strategies of effective problem-based learning tutors were identified and may be used to enhance teaching and plan professional development initiatives.

  11. An Intelligent Computer-Based System for Sign Language Tutoring

    Science.gov (United States)

    Ritchings, Tim; Khadragi, Ahmed; Saeb, Magdy

    2012-01-01

    A computer-based system for sign language tutoring has been developed using a low-cost data glove and a software application that processes the movement signals for signs in real-time and uses Pattern Matching techniques to decide if a trainee has closely replicated a teacher's recorded movements. The data glove provides 17 movement signals from…

  12. An agent-based intelligent tutoring system for nurse education

    NARCIS (Netherlands)

    Hospers, M.; Kroezen, E.; Nijholt, A.; Akker, op den R.; Heylen, D.

    2003-01-01

    This report describes the development of a teaching environment that uses agents to support learning. An Intelligent Tutoring System will be described, that guides students during learning. This system is meant for nurse education in the first place, but it is generic in the sense that the core is s

  13. Effectiveness of Cognitive Tutor Algebra I at Scale

    Science.gov (United States)

    Pane, John F.; Griffin, Beth Ann; McCaffrey, Daniel F.; Karam, Rita

    2014-01-01

    This article examines the effectiveness of a technology-based algebra curriculum in a wide variety of middle schools and high schools in seven states. Participating schools were matched into similar pairs and randomly assigned to either continue with the current algebra curriculum for 2 years or to adopt Cognitive Tutor Algebra I (CTAI), which…

  14. Reading Tutor, A Reading Support System for Japanese Language Learners

    Directory of Open Access Journals (Sweden)

    Yoshiko KAWAMURA

    2012-12-01

    Full Text Available The present paper gives an overview of the tools and materials included in the Japanese language reading tutorial system Reading Tutor and the multilingual lexicographical project Reading Tutor Web Dictionary, and discusses their possible uses both for Japanese language instruction and to support autonomous language learning. The paper further presents one particular use of these tools and resources for the development of learning materials for foreign candidates to the Japanese certified care worker national examination, and concludes with suggestions for effective guidance geared at fostering autonomous vocabulary learning.-----Članek predstavlja orodja in gradiva v sistemu za podporo branju v japonščini Reading Tutor in v večjezičnem slovarskem projektu Reading Tutor Web Dictionary ter njihovo možno uporabo tako za poučevanje japonščine kot tudi za podporo samostojnemu jezikovnemu učenju. Nadalje predstavlja konkreten primer uporabe teh orodij in virov za izdelavo učnega gradiva za tuje kandidate, ki se pripravljajo na japonski državni izpit za zdravstvene delavce. V zaključku predlaga nekaj pedagoških pristopov za učinkovito podporo samostojnemu učenju besedišča.

  15. [Report of Resident Tutor (Jamaica) August 1968-1969.

    Science.gov (United States)

    Gordon, Hopeton

    The annual report of the resident tutor (Jamaica) for the University of the West Indies describes and evaluates courses and programs sponsored by the Department of Extra-Mural Studies between August 1968 and July 1969, and makes mention of attendance figures and response. Topics for courses and seminars included training in various job skills,…

  16. Discursive Practices of Private Online Tutoring Websites in Russia

    Science.gov (United States)

    Kozar, Olga

    2015-01-01

    A recent development in English teaching in Russia is the emergence of private online language-tutoring schools, which offer one-on-one lessons by means of audio/videoconferencing. It remains unclear: (1) how these new providers of educational services are presenting themselves to the potential learners; (2) what ideology they tend to drawn on and…

  17. Training ESOL Instructors and Tutors for Online Conferencing

    Science.gov (United States)

    Hewett, Beth L.; Lynn, Robert

    2007-01-01

    Individualized conferencing, a situation where instructors and tutors work individually with students, is one traditional way in which students whose first language is not English (ESOL) can receive help as they learn and practice their English speaking and writing skills. This article is a demonstration of some of the practical strategies common…

  18. An Agent-based Intelligent Tutoring System for Nurse Education

    NARCIS (Netherlands)

    Hospers, M.A.; Kroezen, E.; Nijholt, Antinus; op den Akker, Hendrikus J.A.; Heylen, Dirk K.J.

    This report describes the development of a teaching environment that uses agents to support learning. An Intelligent Tutoring System will be described, that guides students during learning. This system is meant for nurse education in the first place, but it is generic in the sense that the core is

  19. Identifying Training Needs of Novice Online English Language Tutors

    Science.gov (United States)

    Rodriguez Buitrago, Carolina

    2013-01-01

    Online and blended learning are of growing interest in the English language learning community. In Colombia, national initiatives and policies promote online educational programs and online English courses specifically. As a result, new online tutors are constantly needed for new programs and courses offered by institutions as well as by private…

  20. Analysing Student Programs in the PHP Intelligent Tutoring System

    Science.gov (United States)

    Weragama, Dinesha; Reye, Jim

    2014-01-01

    Programming is a subject that many beginning students find difficult. The PHP Intelligent Tutoring System (PHP ITS) has been designed with the aim of making it easier for novices to learn the PHP language in order to develop dynamic web pages. Programming requires practice. This makes it necessary to include practical exercises in any ITS that…

  1. SISTEMAS TUTORES INTELIGENTES COMO APOYO EN EL PROCESO DE APRENDIZAJE

    Directory of Open Access Journals (Sweden)

    Edwin Eduardo Millan Rojas

    2015-09-01

    Full Text Available El objetivo principal de este artículo es la identificación de las principales características de los tutores inteligentes, su origen y evolución los cuales pueden ofrecer elementos para la formulación de nuevos proyectos de investigación relacionados con la educación y el uso de los tutores. El método utilizado es el descriptivo y sistémico, los cuales permiten recopilar los datos necesarios, la información presentada ha sido adquirida de bases de datos especializadas como IEEE, Redalyc, ACM y Science Direct, además de artículos de revistas de universidades internacionales y de proyectos de investigación descargados de Google Académico. Los Sistemas Tutores Inteligentes surgieron al combinar técnicas de inteligencia artificial (IA con los métodos clásicos de enseñanza. Estos son sistemas de software que generan un ambiente idóneo para la interacción y satisfacción de las necesidades del estudiante, adaptable a los conocimientos previos y a la capacidad de evolución de cada alumno respecto a un área del conocimiento. El funcionamiento de los STI se basa en la relación entre tres principales módulos (tutor, estudiante y dominio, para presentar al usuario la información de manera estructurada. La investigación llevada a cabo permitió reunir los aspectos más relevantes de los Sistemas Tutores Inteligentes (STI y presentarlos como una herramienta óptima para llevar a cabo un proceso de aprendizaje.

  2. Vision in the common bed bug Cimex lectularius L. (Hemiptera: Cimicidae): eye morphology and spectral sensitivity

    Science.gov (United States)

    Bed bugs as pests of public health importance recently experienced a resurgence in populations throughout the U.S. and other countries. Consequently, recent research efforts have focused on improving understanding of bed bug physiology and behavior to improve management. While few studies have inves...

  3. WYSIWYB: A Declarative Approach to Finding API Protocols and Bugs in Linux Code

    DEFF Research Database (Denmark)

    Lawall, Julia; Palix, Nicolas; Hansen, Rene Rydhof

    2009-01-01

    Although a number of approaches to finding bugs in systems code have been proposed, bugs still remain to be found. Current approaches have emphasized scalability more than usability, and as a result it is difficult to relate the results to particular patterns found in the source code and to contr...

  4. Stink bugs (Hemitera: Pentatomidae) in pheromone-baited traps near crop field edges in Georgia

    Science.gov (United States)

    Stink bugs (Hemiptera: Pentatomidae) are economic pests of cotton. Our specific objective for this 3-yr study was to use traps baited with Euschistus spp. pheromone to monitor stink bugs in habitats near cotton and peanut field edges before, during, and after crop growth and development. Plant-feedi...

  5. Attraction of stink bug (Hemiptera: Pentatomidae) nymphs to Euschistus aggregation pheromone in the field

    Science.gov (United States)

    Phytophagous stink bugs (Hemiptera: Pentatomidae) are primary pests in most fruit, vegetable, grain, and row crops worldwide. Pheromones have been identified and synthesized for several species of economically important stink bug pests. When yellow pyramid traps are baited with lures containing thes...

  6. Comparing Fine-Grained Source Code Changes And Code Churn For Bug Prediction

    NARCIS (Netherlands)

    Giger, E.; Pinzger, M.; Gall, H.C.

    2011-01-01

    A significant amount of research effort has been dedicated to learning prediction models that allow project managers to efficiently allocate resources to those parts of a software system that most likely are bug-prone and therefore critical. Prominent measures for building bug prediction models are

  7. Genome assembly and geospatial phylogenomics of the bed bug Cimex lectularius

    NARCIS (Netherlands)

    Rosenfeld, Jeffrey A.; Reeves, Darryl; Brugler, Mercer R.; Narechania, Apurva; Simon, Sabrina; Durrett, Russell; Foox, Jonathan; Shianna, Kevin; Schatz, Michael C.; Gandara, Jorge; Afshinnekoo, Ebrahim; Lam, Ernest T.; Hastie, Alex R.; Chan, Saki; Cao, Han; Saghbini, Michael; Kentsis, Alex; Planet, Paul J.; Kholodovych, Vladyslav; Tessler, Michael; Baker, Richard; DeSalle, Rob; Sorkin, Louis N.; Kolokotronis, Sergios Orestis; Siddall, Mark E.; Amato, George; Mason, Christopher E.

    2016-01-01

    The common bed bug (Cimex lectularius) has been a persistent pest of humans for thousands of years, yet the genetic basis of the bed bug's basic biology and adaptation to dense human environments is largely unknown. Here we report the assembly, annotation and phylogenetic mapping of the 697.9-Mb

  8. Behavioral Responses of the Bed Bug to Permethrin-Impregnated ActiveGuard™ Fabric

    Directory of Open Access Journals (Sweden)

    Scott A. Harrison

    2013-06-01

    Full Text Available ActiveGuard™ Mattress Liners have been used to control house dust mites, and they also are commercially available as an integrated pest management tool for use against bed bugs (Cimex lectularius. The aim of our study was to evaluate responses of numerous populations of the bed bug to the permethrin-impregnated fabric, with particular regard to contact toxicity, repellency, and feeding inhibition. Continuous exposure to ActiveGuard fabric resulted in rapid intoxication for three of four populations, with 87 to 100% of moderately pyrethroid-resistant and susceptible bed bugs succumbing by 1 d. In comparison, a highly resistant population reached 22% mortality at 10 d. Video data revealed that bed bugs readily traversed ActiveGuard fabric and spent a considerable amount of time moving about and resting on it during a 12-h period. ActiveGuard fabric was non-repellent to bed bugs from five tested populations. Furthermore, significantly fewer bed bugs successfully fed to repletion through ActiveGuard fabric than through blank fabric for the five populations. With just 30 min of feeding exposure, mortality ranged from 4% to 83%, depending upon the bed bug strain. These laboratory studies indicate that ActiveGuard liners adversely affected bed bugs from diverse populations.

  9. Predation by ants controls swallow bug (Hemiptera: Cimicidae: Oeciacus vicarius) infestations.

    Science.gov (United States)

    Brown, Charles R; Page, Catherine E; Robison, Grant A; O'Brien, Valerie A; Booth, Warren

    2015-06-01

    The swallow bug (Oeciacus vicarius) is the only known vector for Buggy Creek virus (BCRV), an alphavirus that circulates in cliff swallows (Petrochelidon pyrrhonota) and house sparrows (Passer domesticus) in North America. We discovered ants (Crematogaster lineolata and Formica spp.) preying on swallow bugs at cliff swallow colonies in western Nebraska, U.S.A. Ants reduced the numbers of visible bugs on active swallow nests by 74-90%, relative to nests in the same colony without ants. Ant predation on bugs had no effect on the reproductive success of cliff swallows inhabiting the nests where ants foraged. Ants represent an effective and presumably benign way of controlling swallow bugs at nests in some colonies. They may constitute an alternative to insecticide use at sites where ecologists wish to remove the effects of swallow bugs on cliff swallows or house sparrows. By reducing bug numbers, ant presence may also lessen BCRV transmission at the spatial foci (bird colony sites) where epizootics occur. The effect of ants on swallow bugs should be accounted for in studying variation among sites in vector abundance. © 2015 The Society for Vector Ecology.

  10. Real-Time Measurement of Volatile Chemicals Released by Bed Bugs during Mating Activities

    DEFF Research Database (Denmark)

    Kilpinen, Ole Østerlund; Liu, Dezhao; Adamsen, Anders Peter

    2012-01-01

    In recent years, bed bug (Hemiptera: Cimicidae) problems have increased dramatically in many parts of the world, leading to a renewed interest in their chemical ecology. Most studies of bed bug semiochemicals have been based on the collection of volatiles over a period of time followed by chemical...

  11. Factors affecting captures of brown marmorated stink bug, Halyomorpha halys (Hemiptera: Pentatomidae) in baited pyramid traps

    Science.gov (United States)

    Trapping experiments targeting brown marmorated stink bug, Halyomorpha halys (Stal,) addressed the effects of; 1) a modification to the trap container of a commercial trap, 2) the age of methyl (2E,4E,6Z)-decatrienoate lures, and 3) the age of dichlorvos-impregnated kill strips on bug captures. In ...

  12. Do counts of salivary sheath flanges predict food consumption in herbivorous stink bugs [Hemiptera: Pentatomidae]?

    Science.gov (United States)

    For Pentatomid stink bug agricultural pests, the number of salivary sheaths and sheath flanges—the portion of the sheath visible on the exterior surface of a food item—are good predictors of the loss of crop yield or quality from stink bug feeding. As the often assumed relationship between salivary ...

  13. Acute illnesses associated with insecticides used to control bed bugs--seven states, 2003--2010.

    Science.gov (United States)

    2011-09-23

    The common bed bug, Cimex lectularius, is a wingless, reddish-brown insect that requires blood meals from humans, other mammals, or birds to survive. Bed bugs are not considered to be disease vectors, but they can reduce quality of life by causing anxiety, discomfort, and sleeplessness. Bed bug populations and infestations are increasing in the United States and internationally. Bed bug infestations often are treated with insecticides, but insecticide resistance is a problem, and excessive use of insecticides or use of insecticides contrary to label directions can raise the potential for human toxicity. To assess the frequency of illness from insecticides used to control bed bugs, relevant cases from 2003-2010 were sought from the Sentinel Event Notification System for Occupational Risks (SENSOR)-Pesticides program and the New York City Department of Health and Mental Hygiene (NYC DOHMH). Cases were identified in seven states: California, Florida, Michigan, North Carolina, New York, Texas, and Washington. A total of 111 illnesses associated with bed bug-related insecticide use were identified; although 90 (81%) were low severity, one fatality occurred. Pyrethroids, pyrethrins, or both were implicated in 99 (89%) of the cases, including the fatality. The most common factors contributing to illness were excessive insecticide application, failure to wash or change pesticide-treated bedding, and inadequate notification of pesticide application. Although few cases of illnesses associated with insecticides used to control bed bugs have been reported, recommendations to prevent this problem from escalating include educating the public about effective bed bug management.

  14. Bed bugs and public health: new approaches for an old scourge.

    Science.gov (United States)

    Shum, Mona; Comack, Elizabeth; Stuart, Taz; Ayre, Reg; Perron, Stéphane; Beaudet, Shelley A; Kosatsky, Tom

    2012-11-07

    To share four Canadian cities' experiences with bed bug infestations and to explore public health roles in managing them. We summarize presentations from a workshop at the 2010 Canadian Public Health Association Conference which examined the re-emergence of bed bugs in Canada and compared management approaches of municipal and public health authorities in four large Canadian cities. We include updates on their activities since the workshop. Cities across Canada have observed an increase in complaints of bed bug infestations over recent years. Toronto Public Health considers bed bugs to be a threat to health and has been heavily involved in the front-line response to bed bug complaints. In Winnipeg, Montreal and Vancouver, city inspectors are responsible for investigating complaints, and public health plays a supporting or secondary role. We identified factors that may contribute to successful management of bed bugs: sufficient funding, partnerships among many stakeholders, training and education, and surveillance and evaluation. Various public health agencies in Canadian cities have played key roles in the fight against bed bugs through new initiatives, education, and encouragement and support for others. By working with the public, owners, tenants, the health sector and other stakeholders, public health practitioners can begin to curb the resurgence of bed bugs and the social strains associated with them.

  15. Edge effects of stink bugs in corn, cotton, peanut and soybean fields adjacent to woodland.

    Science.gov (United States)

    Producers face significant crop losses from stink bug species in the southeastern USA, but the high mobility and polyphagy of the bugs make predictions of their presence in crops difficult. While there is some evidence that they colonize crops from adjacent crops, there are no studies of their colo...

  16. WYSIWYB: A Declarative Approach to Finding API Protocols and Bugs in Linux Code

    DEFF Research Database (Denmark)

    Lawall, Julia; Palix, Nicolas; Hansen, Rene Rydhof

    2009-01-01

    Although a number of approaches to finding bugs in systems code have been proposed, bugs still remain to be found. Current approaches have emphasized scalability more than usability, and as a result it is difficult to relate the results to particular patterns found in the source code and to contr...

  17. WYSIWIB: A Declarative Approach to Finding Protocols and Bugs in Linux Code

    DEFF Research Database (Denmark)

    Lawall, Julia Laetitia; Brunel, Julien Pierre Manuel; Hansen, Rene Rydhof

    2008-01-01

    Although a number of approaches to finding bugs in systems code have been proposed, bugs still remain to be found. Current approaches have emphasized scalability more than usability, and as a result it is difficult to relate the results to particular patterns found in the source code and to contr...

  18. Area-wide management approach for tarnished plant bug in the Mississippi Delta

    Science.gov (United States)

    The tarnished plant bug, Lygus lineolaris (Palisot de Beauvois), is the major insect pest of cotton, Gossypium hirsutum (L.), within the Mid-South region. From 2001 to 2012, the tarnished plant bug has been the number one insect pest of cotton in Louisiana and Mississippi in eleven and nine of those...

  19. Herodotos: A Tool to Expose Bugs' Lives

    DEFF Research Database (Denmark)

    Palix, Nicolas; Lawall, Julia L.; Muller, Gilles

    and practices that aid in defect finding, tracking and prevention. In this paper, we propose a methodology and associated tool, Herodotos, to study defects over time. Herodotos semi-automatically tracks defects over multiple versions of a software project, independent of other changes in the source files...

  20. The Effect of Reciprocal Peer Tutoring and Non-Reciprocal Peer Tutoring on the Performance of Students in College Physics

    Science.gov (United States)

    Dioso-Henson, Luzale

    2012-01-01

    Formalised peer-to-peer collaboration and the use of web-enhanced materials that are consistent with course objectives, graded assessments and learning outcomes is well known in educational practice. This study compared the academic gains of college students enrolled in Physics using Reciprocal Peer Tutoring (RPT) with others using non-Reciprocal…

  1. Mark-Release-Recapture Reveals Extensive Movement of Bed Bugs (Cimex lectularius L. within and between Apartments.

    Directory of Open Access Journals (Sweden)

    Richard Cooper

    Full Text Available Understanding movement and dispersal of the common bed bug (Cimex lectularius L. under field conditions is important in the control of infestations and for managing the spread of bed bugs to new locations. We investigated bed bug movement within and between apartments using mark-release-recapture (m-r-r technique combined with apartment-wide monitoring using pitfall-style interceptors. Bed bugs were collected, marked, and released in six apartments. The distribution of marked and unmarked bed bugs in these apartments and their 24 neighboring units were monitored over 32 days. Extensive movement of marked bed bugs within and between apartments occurred regardless of the number of bed bugs released or presence/absence of a host. Comparison of marked and unmarked bed bug distributions confirms that the extensive bed bug activity observed was not an artifact of the m-r-r technique used. Marked bed bugs were recovered in apartments neighboring five of six m-r-r apartments. Their dispersal rates at 14 or 15 d were 0.0-5.0%. The estimated number of bed bugs per apartment in the six m-r-r apartments was 2,433-14,291 at 4-7 d after release. Longevity of bed bugs in the absence of a host was recorded in a vacant apartment. Marked large nymphs (3rd- 5th instar, adult females, and adult males continued to be recovered up to 57, 113, and 134 d after host absence, respectively. Among the naturally existing unmarked bed bugs, unfed small nymphs (1st- 2nd instar were recovered up to 134 d; large nymphs and adults were still found at 155 d when the study ended. Our findings provide important insight into the behavioral ecology of bed bugs in infested apartments and have significant implications in regards to eradication programs and managing the spread of bed bugs within multi-occupancy dwellings.

  2. Mark-Release-Recapture Reveals Extensive Movement of Bed Bugs (Cimex lectularius L.) within and between Apartments.

    Science.gov (United States)

    Cooper, Richard; Wang, Changlu; Singh, Narinderpal

    2015-01-01

    Understanding movement and dispersal of the common bed bug (Cimex lectularius L.) under field conditions is important in the control of infestations and for managing the spread of bed bugs to new locations. We investigated bed bug movement within and between apartments using mark-release-recapture (m-r-r) technique combined with apartment-wide monitoring using pitfall-style interceptors. Bed bugs were collected, marked, and released in six apartments. The distribution of marked and unmarked bed bugs in these apartments and their 24 neighboring units were monitored over 32 days. Extensive movement of marked bed bugs within and between apartments occurred regardless of the number of bed bugs released or presence/absence of a host. Comparison of marked and unmarked bed bug distributions confirms that the extensive bed bug activity observed was not an artifact of the m-r-r technique used. Marked bed bugs were recovered in apartments neighboring five of six m-r-r apartments. Their dispersal rates at 14 or 15 d were 0.0-5.0%. The estimated number of bed bugs per apartment in the six m-r-r apartments was 2,433-14,291 at 4-7 d after release. Longevity of bed bugs in the absence of a host was recorded in a vacant apartment. Marked large nymphs (3rd- 5th instar), adult females, and adult males continued to be recovered up to 57, 113, and 134 d after host absence, respectively. Among the naturally existing unmarked bed bugs, unfed small nymphs (1st- 2nd instar) were recovered up to 134 d; large nymphs and adults were still found at 155 d when the study ended. Our findings provide important insight into the behavioral ecology of bed bugs in infested apartments and have significant implications in regards to eradication programs and managing the spread of bed bugs within multi-occupancy dwellings.

  3. Mark-Release-Recapture Reveals Extensive Movement of Bed Bugs (Cimex lectularius L.) within and between Apartments

    Science.gov (United States)

    Cooper, Richard; Wang, Changlu; Singh, Narinderpal

    2015-01-01

    Understanding movement and dispersal of the common bed bug (Cimex lectularius L.) under field conditions is important in the control of infestations and for managing the spread of bed bugs to new locations. We investigated bed bug movement within and between apartments using mark-release-recapture (m-r-r) technique combined with apartment-wide monitoring using pitfall-style interceptors. Bed bugs were collected, marked, and released in six apartments. The distribution of marked and unmarked bed bugs in these apartments and their 24 neighboring units were monitored over 32 days. Extensive movement of marked bed bugs within and between apartments occurred regardless of the number of bed bugs released or presence/absence of a host. Comparison of marked and unmarked bed bug distributions confirms that the extensive bed bug activity observed was not an artifact of the m-r-r technique used. Marked bed bugs were recovered in apartments neighboring five of six m-r-r apartments. Their dispersal rates at 14 or 15 d were 0.0–5.0%. The estimated number of bed bugs per apartment in the six m-r-r apartments was 2,433–14,291 at 4–7 d after release. Longevity of bed bugs in the absence of a host was recorded in a vacant apartment. Marked large nymphs (3rd– 5th instar), adult females, and adult males continued to be recovered up to 57, 113, and 134 d after host absence, respectively. Among the naturally existing unmarked bed bugs, unfed small nymphs (1st– 2nd instar) were recovered up to 134 d; large nymphs and adults were still found at 155 d when the study ended. Our findings provide important insight into the behavioral ecology of bed bugs in infested apartments and have significant implications in regards to eradication programs and managing the spread of bed bugs within multi-occupancy dwellings. PMID:26352145

  4. Survey of bed bugs in infested premises in Malaysia and Singapore.

    Science.gov (United States)

    How, Yee-Fatt; Lee, Chow-Yang

    2010-06-01

    A total of 54 bed bug-infested sites (hotels, public accommodations, and residential premises) in Malaysia and Singapore was surveyed between July, 2005 and December, 2008. Only one species of bed bug was found, the tropical bed bug Cimex hemipterus (Fabricius). Bed bug infestations were common in hotels and public accommodations when compared to residential premises. The three most common locations of infestation within an infested premise were the bedding (31.1%), the headboard (30.3%), and cracks and crevices surrounding the baseboard, wall, or floor (23.5%). We speculate that the route of movement of bed bugs in hotels and public accommodations is more direct than in residential premises.

  5. Who Is the Preferred Tutor in Clinical Skills Training: Physicians, Nurses, or Peers?

    Science.gov (United States)

    Abay, Ece Şükriye; Turan, Sevgi; Odabaşı, Orhan; Elçin, Melih

    2017-01-01

    Phenomenon: Clinical skills centers allow structured training of undergraduate medical students for the acquisition of clinical skills in a simulated environment. Physician, nurse, or peer tutors are employed for training in those centers. All tutors should have appropriate training about the methodology used in the clinical skills training. Many of the studies revealed the effectiveness of various types of tutors. The aim of our study was to evaluate medical students' satisfaction with clinical skills training, and their opinions about the differences in coaching skills among the physician, nurse, and peer tutors. This study was conducted with third-year students (467 students) in 2013-2014 academic year at Hacettepe University Faculty of Medicine. Participation rate was 85 % (397 students). The students attended the suturing skill training in groups of 40 students. First, a faculty member from the Department of Medical Education delivered a video demonstration and conducted discussion. After the demonstration, the students were divided into groups of 5-6 students. A physician, nurse, or a peer tutor facilitated each group. The students were asked to complete the Coaching Skills Evaluation Form after the practicum session. It contained 13 criteria for assessing the coaching skills. Additionally, the form included a question for rating the student's satisfaction with the tutor. The performance of the tutors at each step was rated on a three-point scale. Kruskal Wallis analysis was used to compare students' scores for their tutors. The students' satisfaction with tutors was high for all of the tutors. However, there was no difference between students' scores in suturing skill, and between physician, nurse, and peer tutors' coaching skills. Insights: In this study, we revealed that physician, nurse, and peer tutors were equally effective on the students' performances. They were also regarded as effective in their teaching role by students. But the most important

  6. Diseño de un Banco del Tiempo Escolar basado en la metodología Peer Tutoring (Tutoría entre iguales)

    OpenAIRE

    Rodríguez Suárez, Vanesa

    2015-01-01

    Reflexión sobre las prácticas, programación didáctica e innovación consistente en el diseño de un banco del tiempo llevado al ámbito escolar y basado en la metodología Peer Tutoring (Tutoría entre iguales).

  7. Rethinking Distance Tutoring in E-Learning Environments: A Study of the Priority of Roles and Competencies of Open University Tutors in China

    Science.gov (United States)

    Li, Shuang; Zhang, Jingjing; Yu, Chen; Chen, Li

    2017-01-01

    This study aims to identify the priority of the roles and competencies of tutors working in the e-learning environments where the tutors are experiencing the changes brought by reforming traditional TV and broadcasting university to open universities. The mixed methods, DACUM, non-participatory observation, and questionnaires were used to identify…

  8. Note-Taking within MetaTutor: Interactions between an Intelligent Tutoring System and Prior Knowledge on Note-Taking and Learning

    Science.gov (United States)

    Trevors, Gregory; Duffy, Melissa; Azevedo, Roger

    2014-01-01

    Hypermedia learning environments (HLE) unevenly present new challenges and opportunities to learning processes and outcomes depending on learner characteristics and instructional supports. In this experimental study, we examined how one such HLE--MetaTutor, an intelligent, multi-agent tutoring system designed to scaffold cognitive and…

  9. Directive versus Facilitative Peer Tutoring? A View on Students' Appraisal, Reported Learning Gains and Experiences within Two Differently-Tutored Learning Environments

    Science.gov (United States)

    Berghmans, Inneke; Michiels, Lotte; Salmon, Sara; Dochy, Filip; Struyven, Katrien

    2014-01-01

    The present study aimed to shed light on students' appraisal and reported learning gains in two differently-tutored learning environments (i.e. directively and facilitatively tutored). In order to investigate this, a quasi-experimental study was set up in the context of a clinical skills learning environment. Not only were participating…

  10. The chemical volatiles (semiochemicals) produced by neo tropical stink bugs (Hemiptera: Pentatomidae)

    Energy Technology Data Exchange (ETDEWEB)

    Moraes, Maria C.B.; Pareja, Martin; Laumann, Raul A.; Borges, Miguel [EMBRAPA Recursos Geneticos e Biotecnologia, Brasilia, DF (Brazil). Nucleo Tematico Controle Biologico

    2008-09-15

    In recent years the growing concern about environmental changes and how we are using the natural resources have triggered a search for natural products as alternatives to synthetic pesticides. The stink bugs produce a wide variety of chemical compounds (semiochemicals) that show potential to manage these insects. The stink bugs Chinavia impicticornis (Stal), C. ubica (Rolston), Dichelops melacanthus (Dallas), Euschistus heros (F.), Piezodorus guildinii (Westwood), Thyanta perditor (Westwood) and Tibraca limbativentris (Stal) had their blends of defensive compounds evaluated both qualitative and quantitatively. The main compounds identified on the glands of Brazilian stink bugs are: 2-alkenals, mainly the E isomer; saturated aliphatic hydrocarbons; and 4 oxo-(E)-2-alkenals. The first sex attractant determined from a stink bug was obtained from Nezara viridula L., and consists on a mix of two isomers cis - and trans bisabolene-epoxides. Later the soybean stink bug E. heros was also studied and its sex attractant was identified as three esters methyl: 2,6,10-trimethyl decanoate, methyl 2,6,10-trimethyl dodecanoate, and methyl E2, Z4-decadienoate. Recently, three new Brazilian sting bugs were studied and had their sex attractant elucidated. Males of T. perditor produce the ester, methyl 2E, 4Z, 6Z-decatrienoate. Whereas, the stink bug, P. guildinii has as sexual pheromone, the sesquiterpene beta-sesqui phellandrene, and the stink bug T. limbativentris produces as sex attractant the zingiberenol. In this review we discuss the advances obtained on the behaviour and identification of sex and defensive compound of stink bugs from Brazilian crops and the application of this knowledge to manage the stink bugs. (author)

  11. Aggregation and Association of NDVI, Boll Injury, and Stink Bugs in North Carolina Cotton.

    Science.gov (United States)

    Reisig, Dominic D; Reay-Jones, F P F; Meijer, A D

    2015-01-01

    Sampling of herbivorous stink bugs in southeastern U.S. cotton remains problematic. Remote sensing was explored to improve sampling of these pests and associated boll injury. Two adjacent 14.5-ha cotton fields were grid sampled in 2011 and 2012 by collecting stink bug adults and bolls every week during the third, fourth, and fifth weeks of bloom. Satellite remote sensing data were collected during the third week of bloom during both years, and normalized difference vegetation index (NDVI) values were calculated. Stink bugs were spatially aggregated on the third week of bloom in 2011. Boll injury from stink bugs was spatially aggregated during the fourth week of bloom in 2012. The NDVI values were aggregated during both years. There was a positive association and correlation between stink bug numbers and NDVI values, as well as injured bolls and NDVI values, during the third week of bloom in 2011. During the third week of bloom in 2012, NDVI values were negatively correlated with stink bug numbers. During the fourth week of bloom in 2011, stink bug numbers and boll injury were both positively associated and correlated with NDVI values. During the fourth week of bloom in 2012, stink bugs were negatively correlated with NDVI values, and boll injury was negatively associated and correlated with NDVI values. This study suggests the potential of remote sensing as a tool to assist with sampling stink bugs in cotton, although more research is needed using NDVI and other plant measurements to predict stink bug injury. © The Author 2015. Published by Oxford University Press on behalf of the Entomological Society of America.

  12. Comparison of Three Bed Bug Management Strategies in a Low-Income Apartment Building

    Directory of Open Access Journals (Sweden)

    Changlu Wang

    2012-04-01

    Full Text Available Bed bug (Cimex lectularius L. infestations are currently controlled by a variety of non-chemical and chemical methods. There have been few studies on the comparative effectiveness of these control techniques. We evaluated three bed bug management strategies in an apartment building: (1 non-chemical methods only (n = 9; (2 insecticides only (n = 6; and (3 integrated pest management including both non-chemical methods and insecticides (n = 9. The apartments were one-bedroom units occupied by seniors or people with disabilities. Bed bug numbers in each apartment were determined by visual inspection and/or installing intercepting devices under bed and sofa legs. The median (min, max bed bug counts in the non-chemical methods only, insecticides only, and integrated pest management (IPM treatment were: 4 (1, 57, 19 (1, 250, and 14 (1, 219, respectively prior to the treatments. The apartments were retreated if found necessary during biweekly to monthly inspections. After 10 weeks, bed bugs were found to be eliminated from 67, 33, and 44% of the apartments in the three treatment groups, respectively. The final (after 10 weeks median (min, max bed bug counts in the non-chemical methods only, insecticides only, and IPM treatment were: 0 (0, 134, 11.5 (0, 58, and 1 (0, 38, respectively. There were no significant differences in the speed of bed bug count reduction or the final bed bug counts. Lack of resident cooperation partially contributed to the failure in eliminating bed bugs from some of the apartments. Results of this study suggest that non-chemical methods can effectively eliminate bed bugs in lightly infested apartments.

  13. Diffusion Rates and Dispersal Patterns of Unfed versus Recently Fed Bed Bugs (Cimex lectularius L.

    Directory of Open Access Journals (Sweden)

    Jerome Goddard

    2015-09-01

    Full Text Available Bed bug problems have been increasing since the 1980s, and accordingly, there have been intensive efforts to better understand their biology and behavior for control purposes. Understanding bed bug diffusion rates and dispersal patterns from one site to another (or lack thereof is a key component in prevention and control campaigns. This study analyzed diffusion rates and dispersal patterns in a population of bed bugs, recently fed and unfed, in both one-dimensional and two-dimensional settings. When placed in the middle of a 71 cm × 2.7 cm artificial lane, approximately half of the bugs regardless of feeding status stayed at or near the release point during the 10 min observation periods, while about a fourth of them walked to the end of the lane. When placed in the middle of an arena measuring 51 cm × 76 cm and allowed to walk in any direction, approximately one-fourth of bed bugs, fed or unfed, still remained near their release point (no significant difference between fed or unfed. As for long-distance dispersal, 11/50 (22% of recently fed bed bugs moved as far as possible in the arena during the 10 min replications, while only 2/50 (4% unfed bed bugs moved to the maximum distance. This difference was significantly different (p < 0.0038, and indicates that unfed bed bugs did not move as far as recently fed ones. A mathematical diffusion model was used to quantify bed bug movements and an estimated diffusion rate range of 0.00006 cm2/s to 0.416 cm2/s was determined, which is almost no movement to a predicted root mean squared distance of approximately 19 cm per 10 min. The results of this study suggest that bed bugs, upon initial introduction into a new area, would have a difficult time traversing long distances when left alone to randomly disperse.

  14. Evaluation of an insecticide dust band treatment method for controlling bed bugs.

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    Wang, Changlu; Singh, Narinderpal; Cooper, Richard; Liu, Chaofeng; Buczkowski, Grzegorz

    2013-02-01

    Current bed bug, Cimex lectularius L., control usually involves insecticide applications that pose a high risk of insecticide exposure to residents and applicators. To minimize these risks and the amount of insecticides used, we designed and evaluated a dust band treatment technique. The laboratory assay showed that 1% cyfluthrin dust treated bands are highly effective in killing bed bugs. We further evaluated this technique in bed bug infested apartments. The "dust band" treatment consisted of installing a 3.8-cm-wide fabric band on furniture legs and brushing Tempo dust (1% cyfluthrin) (Bayer Environmental Science, Research Triangle Park, NC) onto the bands. In addition, interceptors were installed under furniture legs. Alpine (0.5% dinotefuran) aerosol spray was applied directly to live bed bugs found on furniture during biweekly inspections. This treatment was compared with two other treatments: "integrated pest management" (IPM) and "control." The IPM treatment included dust bands plus the following: applying hot steam to infested furniture and surrounding areas, installing mattress encasements, applying 1% cyfluthrin dust around room perimeters, and installing interceptors under furniture legs. Alpine aerosol was applied to live bed bugs found during biweekly inspections. In the control group, the apartments received cursory treatment with insecticide sprays by the existing pest control contractor hired by the property management office. Bed bug numbers before and after treatments were determined based on biweekly interceptor counts or a combination of interceptor counts and visual inspections. From 0 to 12 wk, mean bed bug counts of the dust band, IPM, and the control treatment decreased by 95, 92, and 85%, respectively. Both dust band and IPM resulted in higher bed bug reduction than the control. There was no significant difference in the final counts between dust band and IPM treatments. An additional field experiment showed installing 1% cyfluthrin dust

  15. Free-roaming kissing bugs, vectors of Chagas disease, feed often on humans in the Southwest.

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    Klotz, Stephen A; Schmidt, Justin O; Dorn, Patricia L; Ivanyi, Craig; Sullivan, Katherine R; Stevens, Lori

    2014-05-01

    Kissing bugs, vectors of Trypanosoma cruzi, the parasite that causes Chagas disease, are common in the desert Southwest. After a dispersal flight in summer, adult kissing bugs occasionally gain access to houses where they remain feeding on humans and pets. How often wild, free-roaming kissing bugs feed on humans outside their homes has not been studied. This is important because contact of kissing bugs with humans is one means of gauging the risk for acquisition of Chagas disease. We captured kissing bugs in a zoological park near Tucson, Arizona, where many potential vertebrate hosts are on display, as well as being visited by more than 300,000 humans annually. Cloacal contents of the bugs were investigated for sources of blood meals and infection with T. cruzi. Eight of 134 captured bugs were randomly selected and investigated. All 8 (100%) had human blood in their cloacae, and 7 of 8 (88%) had fed on various vertebrates on display or feral in the park. Three bugs (38%) were infected with T. cruzi. Three specimens of the largest species of kissing bug in the United States (Triatoma recurva) were captured in a cave and walking on a road; 2 of 3 (67%) had fed on humans. No T. recurva harbored T. cruzi. This study establishes that free-roaming kissing bugs, given the opportunity, frequently feed on humans outside the confines of their homes in the desert Southwest and that some harbored T. cruzi. This could represent a hitherto unrecognized potential for transmission of Chagas disease in the United States. Copyright © 2014 Elsevier Inc. All rights reserved.

  16. General physicians graduated from a PBL undergraduate medical curriculum: how well do they perform as PBL tutors?

    Science.gov (United States)

    Kim, Kyong-Jee; Lee, Joo Heung; Kee, Changwon

    2009-06-01

    A study was conducted on the effectiveness of general physicians recently graduated from a medical school with Problem-Based Learning (PBL) curriculum as PBL tutors to expand the school's tutor pool. This study aims to investigate these non-staff tutors' effectiveness in terms of student satisfaction and learning outcomes. An experimental study was conducted of 12 PBL groups of second-year medical students (n = 40). Four PBL groups were led by non-staff tutors; the other eight groups were led by staff tutors during the two PBL units. Tutor evaluation and student satisfaction questionnaires were administered and student performance scores were analysed to compare between groups led by staff tutors and non-staff tutors. The students' overall satisfaction with the non-staff tutors on a five-point Likert-scale was high (M = 4.5 +/-.638). Additionally, the student scores on written tests were comparable between groups. Yet, in one unit, the groups led by staff tutors received significantly higher scores on the group evaluation than those led by non-staff tutors. The results of this study show that the non-staff tutors performed as effectively as the staff tutors did with regard to student achievement in written exams. Still, the findings of this study suggest that different tutor backgrounds and experiences might affect student performance beyond the written exam scores.

  17. Effects of participation in a cross year peer tutoring programme in clinical examination skills on volunteer tutors' skills and attitudes towards teachers and teaching

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    Zamora Javier

    2007-06-01

    Full Text Available Abstract Background Development of students' teaching skills is increasingly recognised as an important component of UK undergraduate medical curricula and, in consequence, there is renewed interest in the potential benefits of cross-year peer tutoring. Whilst several studies have described the use of cross-year peer tutoring in undergraduate medical courses, its use in the clinical setting is less well reported, particularly the effects of peer tutoring on volunteer tutors' views of teachers and teaching. This study explored the effects of participation in a cross-year peer tutoring programme in clinical examination skills ('OSCE tutor' on volunteer tutors' own skills and on their attitudes towards teachers and teaching. Methods Volunteer tutors were final year MBChB students who took part in the programme as part of a Student Selected Component (SSC. Tutees were year 3 MBChB students preparing for their end of year 'OSCE' examination. Pre and post participation questionnaires, including both Likert-type and open response questions, were used. Paired data was compared using the Wilcoxon signed-rank test. All tests were two-tailed with 5% significance level. Results Tutors reflected their cohort in terms of gender but were drawn from among the more academically successful final year students. Most had previous teaching experience. They were influenced to participate in 'OSCE tutor' by a desire to improve their own teaching and associated generic skills and by contextual factors relating to the organisation or previous experience of the OSCE tutor programme. Issues relating to longer term career aspirations were less important. After the event, tutors felt that participation had enhanced their skills in various areas, including practical teaching skills, confidence in speaking to groups and communication skills; and that as a result of taking part, they were now more likely to undertake further teacher training and to make teaching a major part

  18. The effect of peer tutoring on interaction behaviors in inclusive physical education.

    Science.gov (United States)

    Klavina, Aija; Block, Martin E

    2008-04-01

    This study assessed the effect of peer tutoring on physical, instructional, and social interaction behaviors between elementary school age students with severe and multiple disabilities (SMD) and peers without disabilities. Additional measures addressed the activity time of students with SMD. The study was conducted in inclusive general physical education settings under three instructional support conditions for students with SMD: (a) teacher-directed, (b) peer-mediated, and (c) voluntary peer support. During peer-mediated and voluntary peer support conditions, the instructional and physical interaction behaviors between students with SMD and their peers increased, while social interactions remained low. The activity engagement time data increased for all target students throughout intervention sessions. Interactions between students with SMD and teachers decreased toward the end of intervention.

  19. Are tutor-students capable of writing good biochemistry exams?

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    Sé Alexandre B.

    2004-05-01

    Full Text Available In a previous article we described the relevance of student seminars for the learning process of appliedbiochemistry for medical and nutrition students (Hermes-Lima et al., Biochem. Mol.Biol.Educ. 30:30-34,2002. First semester students of a basic biochemistry course (BioBio are divided in 10 groupsof 5 members, and each group is assigned to a specic topic (diabetes, cholesterol, etc under thesupervision of a tutor-student. The tutors have already coursed BioBio and are currently undertakingan advanced biochemistry course. In order to evaluate the learning of applied biochemistry for BioBiostudents a true or false exam (TFE is performed. This exam is made of 50 questions (5 on eachtopic elaborated by the tutors under the supervision of the teacher. The TFE corresponds to 10percent of the grade of BioBio and focus on clinical and/or applied biochemistry situations. At theend of the exam, BioBio students were asked to share their opinions about TFEs (n = 401, from2001/1 to 2003/2. When asked to give a 0-to-4 score regarding (a the diculty level of the test,(b the technical quality and (c if the exam makes an appropriate evaluation of applied biochemistryknowledge, the scores were 2.9, 3.4 and 2.9, respectively. BioBio students were also asked if they ndvalid to be evaluated by a tutor-made exam and if they would like to participate in the making ofTFEs; 96 and 58 percent answered yes, respectively.In another survey, we interviewed former BioBio students from the 2nd to the 7th semesters (n=95about TFEs (since 1999-1 regarding technical aspects, which included (1 clarity of questions, (2 levelof diculty, (3 clinical application and (4 thinking (as opposed to memorizing abilities demanded;the 0-to-4 scores were 3.1, 2.9, 2.6, and 2.5, respectively. Other four questions were on the validityof tutors writing TFEs and their capacity to perform such a task; the average score was 3.2. Oursurveys show the students good acceptance of the seminar system

  20. Undergraduate technical skills training guided by student tutors--analysis of tutors' attitudes, tutees' acceptance and learning progress in an innovative teaching model.

    Science.gov (United States)

    Weyrich, Peter; Schrauth, Markus; Kraus, Bernd; Habermehl, Daniel; Netzhammer, Nicolai; Zipfel, Stephan; Jünger, Jana; Riessen, Reimer; Nikendei, Christoph

    2008-04-09

    Skills labs provide a sheltered learning environment. As close supervision and individual feedback were proven to be important in ensuring effective skills training, we implemented a cross-year peer tutor system in our skills lab of internal medicine that allowed intense training sessions with small learning groups (3-4 students) taught by one student tutor. The expectations, experiences and criticisms of peer tutors regarding the tutor system for undergraduate skills lab training were investigated in the context of a focus group. In addition, tutees' acceptance of this learning model and of their student tutors was evaluated by means of a pre/post web-based survey. 14 voluntary senior students were intensely prepared by consultants for their peer tutor activity. 127 students participated in the project, 66.9% of which responded to the web-based survey (23 topics with help of 6-point Likert scale + free comments). Acceptance was very high (5.69 +/- 0.07, mean +/- SEM), and self-confidence ratings increased significantly after the intervention for each of the trained skills (average 1.96 +/- 0.08, all p teaching model to be sufficient, and a mere 1% expressed the wish for skills training to be provided by faculty staff only. Focus group analyses with tutors revealed 18 different topics, including profit in personal knowledge and personal satisfaction through teaching activities. The ratio of 1:4 tutor/tutees was regarded to be very beneficial for effective feedback, and the personalized online evaluation by tutees to be a strong motivator and helpful for further improvements. The tutors ascribed great importance to the continuous availability of a contact doctor in case of uncertainties. This study demonstrates that peer teaching in undergraduate technical clinical skills training is feasible and widely accepted among tutees, provided that the tutors receive sufficient training and supervision.