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Готові списки джерел за темами / Repeated problems

Добірка наукової літератури з теми "Repeated problems"

Автор: Grafiati

Опубліковано: 24 травня 2022

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Статті в журналах з теми "Repeated problems":

1

Ye, Meng-Hua. "Repeated stochastic tree problems." Economics Letters 20, no. 2 (January 1986): 117–19. http://dx.doi.org/10.1016/0165-1765(86)90156-4.

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2

Darling, April L., Leonid Breydo, Emma G. Rivas, Niad T. Gebru, Dali Zheng, Jeremy D. Baker, Laura J. Blair, Chad A. Dickey, John Koren, and Vladimir N. Uversky. "Repeated repeat problems: Combinatorial effect of C9orf72-derived dipeptide repeat proteins." International Journal of Biological Macromolecules 127 (April 2019): 136–45. http://dx.doi.org/10.1016/j.ijbiomac.2019.01.035.

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3

Street, Deborah J. "Combinatorial problems in repeated measurements designs." Discrete Mathematics 77, no. 1-3 (September 1989): 323–43. http://dx.doi.org/10.1016/0012-365x(89)90371-3.

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4

Hirao, Yukiko. "Learning and Incentive Problems in Repeated Partnerships." International Economic Review 34, no. 1 (February 1993): 101. http://dx.doi.org/10.2307/2526952.

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5

Lin, Xihong, and Raymond J. Carroll. "Semiparametric estimation in general repeated measures problems." Journal of the Royal Statistical Society: Series B (Statistical Methodology) 68, no. 1 (February 2006): 69–88. http://dx.doi.org/10.1111/j.1467-9868.2005.00533.x.

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6

Sakinofsky, Isaac, Robin S. Roberts, and Patricia James. "Why Parasuicides Repeat Despite Problem Resolution." British Journal of Psychiatry 156, no. 3 (March 1990): 399–405. http://dx.doi.org/10.1192/bjp.156.3.399.

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To discover why parasuicides who resolved their difficulties repeated self-harm within three-month follow-up at the same rate as those who had not resolved problems, a group of 30 repeaters was compared with 156 non-repeaters. The repeaters had a history of more frequent episodes, beginning younger. Their problems were more severe, the acts of self-harm potentially less lethal. They experienced greater feelings of externally directed hostility, powerlessness, and ‘normlessness'. A constellation of nine variables correctly predicted 81.5% of the repeaters and 77.5% of the non-repeaters. At follow-up the non-repeaters had improved on several parameters but the repeaters were essentially unchanged. The resolvers among the subgroup of repeaters were more like repeaters in the overall sample than the resolvers, which may explain why some parasuicides repeat in spite of resolving their problems.

7

Eifert, Georg H., and Kevin Duggan. "Problems with repeated exposures to behavior test situations." Journal of Behavior Therapy and Experimental Psychiatry 16, no. 2 (June 1985): 185–86. http://dx.doi.org/10.1016/0005-7916(85)90056-4.

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8

Pach, János, and Micha Sharir. "Repeated angles in the plane and related problems." Journal of Combinatorial Theory, Series A 59, no. 1 (January 1992): 12–22. http://dx.doi.org/10.1016/0097-3165(92)90094-b.

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9

RIVALS, ERIC. "A SURVEY ON ALGORITHMIC ASPECTS OF TANDEM REPEATS EVOLUTION." International Journal of Foundations of Computer Science 15, no. 02 (April 2004): 225–57. http://dx.doi.org/10.1142/s012905410400239x.

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Local repetitions in genomes are called tandem repeats. A tandem repeat contains multiple, but slightly different copies of a repeated unit. It changes over time as the copies are altered by mutations, when additional copies are created by amplification of an existing copy, or when a copy is removed by contraction. Theses changes let tandem repeats evolve dynamically. From this statement follow two problems. TANDEM REPEAT HISTORY aims at recovering the history of amplifications and mutations that produced the tandem repeat sequence given as input. Given the tandem repeat sequences at the same genomic location in two individuals and a cost function for amplifications, contractions, and mutations, the purpose of TANDEM REPEAT ALLELE ALIGNMENT is to find an alignment of the sequences having minimal cost. We present a survey of these two problems that allow to investigate evolutionary mechanisms at work in tandem repeats.

10

Hou, Gene J. W., and Scan P. Kenny. "Eigenvalue and eigenvector approximate analysis for repeated eigenvalue problems." AIAA Journal 30, no. 9 (September 1992): 2317–24. http://dx.doi.org/10.2514/3.11220.

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Дисертації з теми "Repeated problems":

1

Etheve, Marc. "Solving repeated optimization problems by Machine Learning." Thesis, Paris, HESAM, 2021. http://www.theses.fr/2021HESAC040.

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Cette thèse a pour but d’utiliser des techniques d’apprentissage automatique pour larésolution de problèmes linéaires en nombres entiers issus de données stochastiques. Plutôt que de lesrésoudre indépendamment, nous proposons de tirer profit des similarités entre instances en apprenantdifférentes stratégies au sein d’un algorithme de Branch and Bound (B&B).L’axe principal développé est l’utilisation d’apprentissage par renforcement pour découvrir des stratégiesminimisant la taille des arbres de B&B. Afin de s’adapter `a l’environnement induit par l’algorithmede B&B, nous définissons un nouveau type de transitions au sein de processus de décision markoviens,basées sur la structure d’arbre binaire. Par ailleurs, nous étudions différents modèles de coûts et prouvonsl’optimalité du modèle de coût unitaire sous les transitions classiques et binaires, dans l’apprentissagedes stratégies de branchement et de sélection de noeud. Pour autant, les expérimentations menéessuggèrent qu’il peut -être préfèrable de biaiser le modèle de coût afin d’améliorer la stabilité du processusd’apprentissage. En ce qui concerne la stratégie de sélection de noeud, nous démontrons l’optimalitéd’une stratégie explicitement définie, qui peut -être apprise plus efficacement de manière supervisée.Par ailleurs, nous proposons d’exploiter la structure des problèmes étudiés. Nous étudions pour cela unestratégie de décomposition-coordination, une heuristique de branchement basée sur une représentationpar graphe d’un noeud de l’arbre de B&B et enfin l’apprentissage de perturbations de la fonction objectif
This thesis aims at using machine learning techniques in the context of Mixed Integer LinearProgramming instances generated by stochastic data. Rather than solve these instances independentlyusing the Branch and Bound algorithm (B&B), we propose to leverage the similarities between instancesby learning inner strategies of this algorithm, such as node selection and branching.The main approach developed in this work is to use reinforcement learning to discover by trials-and-errorsstrategies which minimize the B&B tree size. To properly adapt to the B&B environment, we definea new kind of tree-based transitions, and elaborate on different cost models in the correspondingMarkov Decision Processes. We prove the optimality of the unitary cost model under both classical andtree-based transitions, either for branching or node selection. However, we experimentally show that itmay be beneficial to bias the cost so as to improve the learning stability. Regarding node selection, weformally exhibit an optimal strategy which can be more efficiently learnt directly by supervised learning.In addition, we propose to exploit the structure of the studied problems. To this end, we propose adecomposition-coordination methodology, a branching heuristic based on a graph representation of aB&B node and finally an approach for learning to disrupt the objective function

2

Burkov, Andriy. "Leveraging Repeated Games for Solving Complex Multiagent Decision Problems." Thesis, Université Laval, 2011. http://www.theses.ulaval.ca/2011/28028/28028.pdf.

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Prendre de bonnes décisions dans des environnements multiagents est une tâche difficile dans la mesure où la présence de plusieurs décideurs implique des conflits d'intérêts, un manque de coordination, et une multiplicité de décisions possibles. Si de plus, les décideurs interagissent successivement à travers le temps, ils doivent non seulement décider ce qu'il faut faire actuellement, mais aussi comment leurs décisions actuelles peuvent affecter le comportement des autres dans le futur. La théorie des jeux est un outil mathématique qui vise à modéliser ce type d'interactions via des jeux stratégiques à plusieurs joueurs. Des lors, les problèmes de décision multiagent sont souvent étudiés en utilisant la théorie des jeux. Dans ce contexte, et si on se restreint aux jeux dynamiques, les problèmes de décision multiagent complexes peuvent être approchés de façon algorithmique. La contribution de cette thèse est triple. Premièrement, elle contribue à un cadre algorithmique pour la planification distribuée dans les jeux dynamiques non-coopératifs. La multiplicité des plans possibles est à l'origine de graves complications pour toute approche de planification. Nous proposons une nouvelle approche basée sur la notion d'apprentissage dans les jeux répétés. Une telle approche permet de surmonter lesdites complications par le biais de la communication entre les joueurs. Nous proposons ensuite un algorithme d'apprentissage pour les jeux répétés en ``self-play''. Notre algorithme permet aux joueurs de converger, dans les jeux répétés initialement inconnus, vers un comportement conjoint optimal dans un certain sens bien défini, et ce, sans aucune communication entre les joueurs. Finalement, nous proposons une famille d'algorithmes de résolution approximative des jeux dynamiques et d'extraction des stratégies des joueurs. Dans ce contexte, nous proposons tout d'abord une méthode pour calculer un sous-ensemble non vide des équilibres approximatifs parfaits en sous-jeu dans les jeux répétés. Nous montrons ensuite comment nous pouvons étendre cette méthode pour approximer tous les équilibres parfaits en sous-jeu dans les jeux répétés, et aussi résoudre des jeux dynamiques plus complexes.
Making good decisions in multiagent environments is a hard problem in the sense that the presence of several decision makers implies conflicts of interests, a lack of coordination, and a multiplicity of possible decisions. If, then, the same decision makers interact continuously through time, they have to decide not only what to do in the present, but also how their present decisions may affect the behavior of the others in the future. Game theory is a mathematical tool that aims to model such interactions as strategic games of multiple players. Therefore, multiagent decision problems are often studied using game theory. In this context, and being restricted to dynamic games, complex multiagent decision problems can be algorithmically approached. The contribution of this thesis is three-fold. First, this thesis contributes an algorithmic framework for distributed planning in non-cooperative dynamic games. The multiplicity of possible plans is a matter of serious complications for any planning approach. We propose a novel approach based on the concept of learning in repeated games. Our approach permits overcoming the aforementioned complications by means of communication between players. We then propose a learning algorithm for repeated game self-play. Our algorithm allows players to converge, in an initially unknown repeated game, to a joint behavior optimal in a certain, well-defined sense, without communication between players. Finally, we propose a family of algorithms for approximately solving dynamic games, and for extracting equilibrium strategy profiles. In this context, we first propose a method to compute a nonempty subset of approximate subgame-perfect equilibria in repeated games. We then demonstrate how to extend this method for approximating all subgame-perfect equilibria in repeated games, and also for solving more complex dynamic games.

3

Yousaf, Muhammad. "Repeated updating as a solution tool for linear least squares problems." Thesis, University of Essex, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.528864.

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4

Vadasy, Patricia F. "Routes to comprehension for second-graders with reading problems : one-to-one tutoring in repeated reading versus comprehension strategy instruction /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/7519.

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5

Brown, Leonard Dale. "The effects of alternative reading and math strategy treatments on word problem-solving." Oxford, Ohio : Miami University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1272846865.

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6

Wittchen, Hans-Ulrich, Silke Behrendt, Michael Höfler, Axel Perkonigg, Jürgen Rehm, Roselind Lieb, and Katja Beesdo. "A typology of cannabis-related problems among individuals with repeated illegal drug use in the first three decades of life: Evidence for heterogeneity and different treatment needs." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-111264.

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Background: Cannabis use (CU) and disorders (CUD) are highly prevalent among adolescents and young adults. We aim to identify clinically meaningful latent classes of users of cannabis and other illegal substances with distinct problem profiles. Methods: N= 3021 community subjects aged 14–24 at baseline were followed-up over a period ranging up to 10 years. Substance use (SU) and disorders (SUD) were assessed with the DSM-IV/M-CIDI. Latent class analysis (LCA) was conducted with a subset of N= 1089 subjects with repeated illegal SU. The variables entered in the LCA were CU-related problems, CUD, other SUD, and other mental disorders. Results: Four latent classes were identified: “Unproblematic CU” (class 1: 59.2%), “Primary alcohol use disorders” (class 2: 14.4%), “Delinquent cannabis/alcohol DSM-IV-abuse” (class 3: 17.9%), “CUD with multiple problems” (class 4: 8.5%). Range and level of CU-related problems were highest in classes 3 and 4. Comorbidity with other mental disorders was highest in classes 2 and 4. The probability of alcohol disorders and unmet treatment needs was considerable in classes 2–4. Conclusion: While the majority of subjects with repeated illegal SU did not experience notable problems over the 10-year period, a large minority (40.8%) experienced problematic outcomes, distinguished by clinically meaningful profiles. The data underline the need for specifically tailored interventions for adolescents with problematic CU and highlight the potentially important role of alcohol and other mental disorders.

7

Wittchen, Hans-Ulrich, Silke Behrendt, Michael Höfler, Axel Perkonigg, Jürgen Rehm, Roselind Lieb, and Katja Beesdo. "A typology of cannabis-related problems among individuals with repeated illegal drug use in the first three decades of life: Evidence for heterogeneity and different treatment needs." Technische Universität Dresden, 2009. https://tud.qucosa.de/id/qucosa%3A26837.

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Background: Cannabis use (CU) and disorders (CUD) are highly prevalent among adolescents and young adults. We aim to identify clinically meaningful latent classes of users of cannabis and other illegal substances with distinct problem profiles. Methods: N= 3021 community subjects aged 14–24 at baseline were followed-up over a period ranging up to 10 years. Substance use (SU) and disorders (SUD) were assessed with the DSM-IV/M-CIDI. Latent class analysis (LCA) was conducted with a subset of N= 1089 subjects with repeated illegal SU. The variables entered in the LCA were CU-related problems, CUD, other SUD, and other mental disorders. Results: Four latent classes were identified: “Unproblematic CU” (class 1: 59.2%), “Primary alcohol use disorders” (class 2: 14.4%), “Delinquent cannabis/alcohol DSM-IV-abuse” (class 3: 17.9%), “CUD with multiple problems” (class 4: 8.5%). Range and level of CU-related problems were highest in classes 3 and 4. Comorbidity with other mental disorders was highest in classes 2 and 4. The probability of alcohol disorders and unmet treatment needs was considerable in classes 2–4. Conclusion: While the majority of subjects with repeated illegal SU did not experience notable problems over the 10-year period, a large minority (40.8%) experienced problematic outcomes, distinguished by clinically meaningful profiles. The data underline the need for specifically tailored interventions for adolescents with problematic CU and highlight the potentially important role of alcohol and other mental disorders.

8

Arner, Erik. "Solving repeat problems in shotgun sequencing /." Stockholm, 2006. http://diss.kib.ki.se/2006/91-7140-996-3/.

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9

Ndikintum, Nfii Kangong. "A Special Inference Problem in Repeated Measures Design with Applications to Pulse Oximetry." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1177418766.

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10

Brown, Leonard Dale. "The effects of alternative reading and math strategy treatments on word problem-solving." Miami University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=miami1272846865.

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Книги з теми "Repeated problems":

1

Kenny, Sean P. Approximate analysis for repeated eigenvalue problems with applications to controls-structures integrated design. Hampton: National Aeronautics and Space Administration, Langley Research Center, 1994.

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2

Thomas, Jonathan. Income fluctuation and asymmetric information: An example of a repeated principal-agent problem. Reading: University of Reading. Department of Economics, 1987.

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3

Thomas, Jonathan. Income fluctuation and asymmetric information: An example of a repeated principal-agent problem. Reading: University of Reading, 1987.

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4

Thomas, Jonathan. Income fluctuation and asymmetric information: An example of a repeated principal-agent problem. Reading: University of Reading Department of Economics, 1987.

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5

Black, Claudia. Repeat after me. Denver, CO: M.A.C Printing & Publications, 1985.

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6

Black, Claudia. Repeat after me. Denver, Colo: M.A.C. Printing & Publications, 1985.

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7

Webster, A. J. Can a brief, three session intervention of play therapy help a school age child to explore feelings of being able to cope (or not) with the disruption of repeated hospital admissions caused by a chronic health problem? London: University of Surrey Roehampton, 2000.

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8

United States. Congress. House. Committee on the Judiciary. Expressing the sense of the Congress that states should work more aggressively to attack the problem of violent crimes committed by repeat offenders and criminals serving abbreviated sentences: Report (to accompany H. Con. Res. 75). [Washington, D.C.?: U.S. G.P.O., 1997.

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9

Judiciary, United States Congress House Committee on the. Expressing the sense of the Congress that states should work more aggressively to attack the problem of violent crimes committed by repeat offenders and criminals serving abbreviated sentences: Report (to accompany H. Con. Res. 75). [Washington, D.C.?: U.S. G.P.O., 1997.

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10

Jan, Show-Li. Interdirection tests for repeated measures and one-sample multivariate location problems. 1991.

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Частини книг з теми "Repeated problems":

1

Love, E. R. "Repeated singular integrals." In Potential Theory Surveys and Problems, 229–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/bfb0103363.

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2

Goldberg, E. Matilda, Jane Gibbons, and Ian Sinclair. "Task-Centred Work with Clients Who Repeated Overdose." In Problems, Tasks and Outcomes, 212–20. London: Routledge, 2021. http://dx.doi.org/10.4324/9781003196495-25.

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3

Friedman, James W. "A Review of Refinements, Equilibrium Selection, and Repeated Games." In Problems of Coordination in Economic Activity, 17–47. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1398-4_2.

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4

Jha, Mayank, and Sunita Singhal. "GA with Repeated Crossover for Rectifying Optimization Problems." In Business Intelligence for Enterprise Internet of Things, 195–202. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44407-5_11.

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5

Friedman, James W., and Larry Samuelson. "The “Folk Theorem” for Repeated Games and Continuous Decision Rules." In Problems of Coordination in Economic Activity, 103–27. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1398-4_6.

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6

Stanford, William. "On the Concepts of Strategy and Equilibrium in Discounted Repeated Games." In Problems of Coordination in Economic Activity, 89–101. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1398-4_5.

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7

Sellke, Thomas. "Repeated-MLE procedures for stochastic approximation in quantal response problems." In Institute of Mathematical Statistics Lecture Notes - Monograph Series, 283–97. Hayward, CA: Institute of Mathematical Statistics, 1986. http://dx.doi.org/10.1214/lnms/1215540306.

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8

Park, So-Young, and Sang-Ho Lee. "Multi-proxy Signatures Based on Diffie-Hellman Problems Allowing Repeated Delegations." In Lecture Notes in Computer Science, 340–44. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11527725_36.

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9

Noda, Itsuki, and Masayuki Ohta. "Meta-level Control of Multiagent Learning in Dynamic Repeated Resource Sharing Problems." In PRICAI 2008: Trends in Artificial Intelligence, 296–308. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-89197-0_29.

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10

Veilande, Ingrida, Liga Ramana, and Sandra Krauze. "Repeated Participation at the Mathematical Olympiads: A Comparative Study of the Solutions of Selected Problems." In Mathematical Creativity and Mathematical Giftedness, 343–72. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73156-8_13.

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Тези доповідей конференцій з теми "Repeated problems":

1

Govoruschenko, Tetyana. "Forming Logical Deduction Technique of Repeated Software Testing System." In 2006 International Conference - Modern Problems of Radio Engineering, Telecommunications, and Computer Science. IEEE, 2006. http://dx.doi.org/10.1109/tcset.2006.4404640.

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2

HOU, GENE, and SEAN KENNY. "Eigenvalue and eigenvector sensitivity and approximate analysis for repeated eigenvalue problems." In 32nd Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1991. http://dx.doi.org/10.2514/6.1991-1089.

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3

Pertsov, S. S., A. Yu Abramova, A. B. Simakov, and I. N. Vodokhlebov. "METABOLIC PARAMETERS AND BEHAVIORAL ACTIVITY AT VARIOUS STAGES OF REPEATED EXPOSURE TO UHF ELECTROMAGNETIC RADIATION: EXPERIMENTAL STUDY." In MODERN PROBLEMS IN SYSTEMIC REGULATION OF PHYSIOLOGICAL FUNCTIONS. NPG Publishing, 2019. http://dx.doi.org/10.24108/5-2019-confnf-64.

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4

Levy, Bryan, Ethan Hilton, Megan Tomko, and Julie Linsey. "Investigating Problem Similarity Through Study of Between-Subject and Within-Subject Experiments." In ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/detc2017-68428.

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Design problems are used to evaluate students’ abilities, the impact of various teaching approaches and of design methods. Design problems greatly vary in style and subject area in order to accommodate for a wide distribution of disciplines, cultures, and expertise. While design problems are occasionally reused between studies, new design problems are continuously created in order to account for the fact that a design problem cannot be used multiple times on an individual in order to effectively measure one’s abilities to perform design. More specifically, in repeated measures testing, students cannot receive the same design problem multiple times, for this would cause bias; therefore, multiple design problems are needed to allow for repeated measures testing. The nature and structure of these multiple design problems need to be similar or “equivalent” in order to accurately measure students’ abilities to perform in design. In this study, we examine four design problems: peanut shelling, corn husking, coconut harvesting, and a personal alarm clock. We determine whether these problems could be deemed equivalent for the purposes of evaluating student design performance through repeated measures testing. We implemented idea generation sessions using both between-subject and within-subjects approaches. Solutions were evaluated on quantity, quality, novelty, variety, and completeness metrics. The data implies that the Peanut and Corn problems are similar in nature and the Alarm and Coconut problems are also similar in nature; as such, these problem pairings may be used to test differences based on group means.

5

"Repeated presentation for identification of the same person by the same features: problems of admissibility." In LEGAL ISSUES OF STRENGTHENING RUSSIAN STATEHOOD. Vol. 79. Tomsk State University, 2018. http://dx.doi.org/10.17223/9785946217637/24.

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6

Stotter, Christian, Robert Supper, Ingrid Schattauer, Bruno Meurers, Massimo Chiappini, Shigeo Okuma, and Riccardo De Ritis. "Inferences from Repeated Airborne Magnetic Measurements on the Island of Vulcano (Eolian Islands, Italy) for Volcanic Risk Mitigation." In Symposium on the Application of Geophysics to Engineering and Environmental Problems 2004. Environment and Engineering Geophysical Society, 2004. http://dx.doi.org/10.4133/1.2923269.

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7

Stotter, Christian, Robert Supper, Ingrid Schattauer, Bruno Meurers, Massimo Chiappini, Shigeo Okuma, and Riccardo De Ritis. "Inferences From Repeated Airborne Magnetic Measurements On The Island Of Vulcano (Eolian Islands, Italy) For Volcanic Risk Mitigation." In 17th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems. European Association of Geoscientists & Engineers, 2004. http://dx.doi.org/10.3997/2214-4609-pdb.186.air04.

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8

Manabe, Yuki, Hiromichi Nishida, Hirokazu Onishi, Toshiki Hirogaki, and Eiichi Aoyama. "Investigation of Laser Hardening Forming Method for Thin Steel Plate From a View of Origami Engineering." In JSME 2020 Conference on Leading Edge Manufacturing/Materials and Processing. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/lemp2020-8588.

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Abstract In recent years, products have been miniaturized and multi-functionalized, and the importance of integration in compact machine tools has increased. In this study, we propose integration via laser hardening forming which combines laser hardening and laser forming on a compact machine toolfor thin steel sheets. For the processing, the deformation and quenching were considered during repeated laser scanning repeated at the same location. In addition, to apply laser quenching forming to origami engineering, a test piece with resilience was prototyped. As a result, problems in repeated laser scanning were clarified, and the tool’s applicability to origami engineering was demonstrated.

9

Zelensky, R. A., A. A. Pachkin, M. V. Ivanisova, and O. Yu Kremneva. "Effectiveness of LED traps for monitoring and controlling cotton bollworm in sunflower crops." In CURRENT STATE, PROBLEMS AND PROSPECTS OF THE DEVELOPMENT OF AGRARIAN SCIENCE. Federal State Budget Scientific Institution “Research Institute of Agriculture of Crimea”, 2020. http://dx.doi.org/10.33952/2542-0720-2020-5-9-10-21-1.

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Sunflower is one of the strategic crops in the Krasnodar Territory. The lack of timely monitoring, the widespread and repeated use of chemical insecticides has led to pests resistance to them. This situation creates a need for new methods of monitoring and protecting the crops from economically significant insects. The purpose of these studies was to identify the effectiveness of LED traps for monitoring and controlling Helicoverpa armigera. The paper presents a comparative analysis of captured insects using aspiration and conical traps. The dynamics of captured insects and the possibility of using these devices as a means of monitoring and reducing the number of cotton scoops are shown.

10

Yong, Woon Yik, and Patrick S. Keogh. "Thermoelastic Growth of an Auxiliary Bearing Surface Due to Repeated Rotor Dynamic Contact and Rubbing." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-35214.

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There are a number of important issues relating to rotor/auxiliary contact in magnetic bearing systems. Primarily, an auxiliary bearing must prevent rotor/stator contact during events such as system power failure and large scale input disturbances. The auxiliary bearing may experience repeated contacts ranging from short timescale transient events to longer timescale rubs. While many studies of the rotor dynamic responses have been undertaken and reported in the open literature, the associated problems relating to thermoelastic distortion have received relatively little attention. These are important since high initial slip speeds will lead to localized heating that may cause large and highly transient surface temperature changes. Repeated contact events or repeated rubbing over a surface deformation may also lead to an accumulative increase in the level of surface distortion. This paper presents a study of the methodology that could be used to assess the overall thermoelastic distortion between a rotor and an auxiliary bearing. It shows that an assessment of the dynamic accumulation of distortion is possible from fundamental studies of individual contact events. The results from case studies highlight the possible problems that could be caused by clearance reductions during operation.

Звіти організацій з теми "Repeated problems":

1

Liu, Zhanjiang John, Rex Dunham, and Boaz Moav. Developmental and Evaluation of Advanced Expression Vectors with Both Enhanced Integration and Stable Expression for Transgenic Farmed Fish. United States Department of Agriculture, December 2001. http://dx.doi.org/10.32747/2001.7585196.bard.

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The objectives of the project were to develop expression vectors using the Sleeping Beauty transposon technology and the genetic border elements to provide both enhanced integration rate and stable transgene expression, and to evaluate the application of such vectors in farmed fish such as catfish and carp. The panel recommended adding the objective of evaluating the endogenous transposable elements, particularly in catfish, in order to evaluate the applicability of the expression vectors while reduc1ng efforts in real production of transgenic fish considering the focus of the project was to develop the vector and evaluation of its applicability, not producing transgenic fish. Efficient production of transgenic farmed fish is hindered by two major problems: mosaicism due to delayed integration after single-cell stage, and silencing of transgene expression. In this project, we proposed to combat these problems by coupling the Sleeping Beauty transposon technology that can enhance integration rate and the border elements that can insulate transgene from position effect. Our major objective was to develop a new generation of expression vector that contains both of these elements. We have developed expression vectors containing both the Sleeping Beauty transposon signals, inverted repeats and direct repeats (IR and DR, respectively), and the border elements, scs and scs'. Growth hormone minigene has been cloned into this vector for applications of such vectors in growth enhancement. Luc reporter gene has been also cloned into this vector cascades for relative easy evaluation of transgene expression. Transgenic fish have been produced using these expression vectors in both catfish (US) and carp (Israel). Much effort was also devoted to evaluation of the endogenous transposable elements in catfish as recommended by the BARD grant panel. Multiple families of Tcl-like transposons were identified from catfish. Surprisingly, many Tc I-related transcripts were identified. Among these transcripts, both the sense and antisense transcripts were present. Some of the transcripts may be useful for development of novel transposase-based technology for aquaculture applications in the future. This project has both scientific and aquaculture implications. First, to develop expression vectors containing both IR/DR and scs/scs' repeated elements have been reported being extremely technically difficult due to excision of the repeated sequences by the E. coli host during cloning processes. We have successfully constructed this advanced vector that contained very complex cascades for both gene integration and gene regulation. We have produced transgenic fish using such vectors. This advanced expression vector should be useful for production of transgenic fish. By simply replacing the growth hormone gene, any gene of interest can be readily inserted in this vector. Thus this vector should provide technological possibility for early integration and stable expression of any economically important genes in aquaculture. We have also evaluated the applications of the Sleeping Beauty-based vectors in terms of the impact of gene size and found that the size of trans gene drastically affects transposition. The system will be only useful for transferring genes smaller than 5.6 kb. We have also identified novel transposase-related transcripts that may be useful for the development of novel transposase-based technologies for general scientific research and for aquaculture applications.

2

Bray, Elizabeth, Zvi Lerner, and Alexander Poljakoff-Mayber. The Role of Phytohormones in the Response of Plants to Salinity Stress. United States Department of Agriculture, September 1994. http://dx.doi.org/10.32747/1994.7613007.bard.

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Salinity is an increasing problem in many irrigated areas of crop production and is a significant factor in reducing crop productivity. Developmental, physiological, and molecular responses to salinity were studied in order to improve our understanding of these responses. Improvements in our understanding of plant responses to salinity are necessary in order to develop crops with improved salt tolerance. Previously, in Israel, it was shown that Sorghum biccolor can adapt to an otherwise lethal concentration of NaCl. These experiments were refined and it was shown that there is a specific window of development in which this adaption can occur. Past the window of development, Sorghum plants can not be adapted. In addition, the ability to adapt is not present in all genotypes of Sorghum. Cultivars that adapt have an increased coefficient of variation for many of the physiological parameters measured during the mid-phase of adaptation. Therefore, it is possible that the adaptation process does not occur identically in the entire population. A novel gene was identified, isolated and characterized from Sorghum that is induced in roots in response to salinity. This gene is expressed in roots in response to salt treatments, but it is not salt-induced in leaves. In leaves, the gene is expressed without a salt treatment. The gene encodes a proline-rich protein with a novel proline repeat, PEPK, repeated more than 50 times. An antibody produced to the PEPK repeat was used to show that the PEPK protein is present in the endodermal cell wall of the root during salt treatments. In the leaves, the protein is also found predominantly in the cell wall and is present mainly in the mesophyll cells. It is proposed that this protein is involved in the maintenance of solute concentration.

3

Phillips, Donald A., Yitzhak Spiegel, and Howard Ferris. Optimizing nematode management by defining natural chemical bases of behavior. United States Department of Agriculture, November 2006. http://dx.doi.org/10.32747/2006.7587234.bard.

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This project was based on the hypothesis that nematodes interacting with plants as either parasites or beneficial saprophytes are attracted to their host by natural products. This concept was supported by numerous observations that parasitic nematodes are attracted to root exudates. Our overall goal was to identify nematode sensory compounds from root exudates and to use that information for reducing nematicide applications. We applied skills of the investigators to achieve three specific objectives: 1) Identify nematode behavioral cues (e.g., attractants or repellents) in root exudates; 2) Identify new natural nematicidal compounds; and 3) Combine a natural attractant and a nematicide into a nematode trap. Because saprophytic nematodes benefit plants by mineralizing organic matter, we sought compounds attractive primarily to parasitic nematodes. The project was constructed on several complementary foundations. First, data from Dr. Spiegel’s lab showed that under aseptic conditions Ditylenchus dipsaci, a parasite on onion, is attracted to certain fractions of onion root exudates. Second, PI Phillips had a sizeable collection of natural plant products he had identified from previous work on Rhizobium-legume interactions, which could be tested “off the shelf”. Third, Dr. Ferris had access to aseptic and natural populations of various saprophytic and parasitic nematodes. The project focused on five nematode species: D.dipsaci, Heterodera avenae, and Tylenchulussemipenetransat ARO, and Meloidogyne javanicand Caenorhabditis elegans at UCD. Ten pure plant compounds, mostly flavonoids, were tested on the various nematode species using six different assay systems. Results obtained with assorted test systems and by various scientists in the same test systems were essentially irreproducible. Many convincing, Many convincing, i.e. statistically significant, results in one system or with one investigator could not be repeated with other assays or different people. A recent report from others found that these compounds, plus another 30, were inactive as attractants in three additional parasitic nematode species (Wuyts et al. Nematology 8:89- 101, 2006). Assays designed to test the hypothesis that several compounds together are required to attract nematodes have thus far failed to find a reproducibly active combination. In contrast to results using pure plant compounds, complex unfractionated exudates from aseptic onion root reproducibly attracted D. dipsaci in both the ARO and UCD labs. Onion root exudate collection, separation into HPLC fractions, assays using D. dipsaci and MS-MS experiments proceeded collaboratively between ARO and UCD without any definitive identification of an active compound. The final active fraction contained two major molecules and traces of several other compounds. In the end, analytical studies were limited by the amount of onion root exudate and the complexity of the purification process. These tests showed that aseptic plant roots release attractant molecules, but whether nematodes influence that release, as insects trigger release of attractants from plants, is unknown. Related experiments showed that the saprophyte C. elegans stimulates its prey, Pseudomonas bacteria, to increase production of 2, 4-diacetylphloroglucinol (DAPG) a compound that promotes amino acid exudation by plant roots. It is thus possible that saprophytic nematodes are attracted primarily to their bacterial or fungal prey and secondarily to effects of those microorganisms on root exudation. These observations offer promising avenues for understanding root-zone interactions, but no direct routes to controlling nematodes in agriculture were evident. Extracts from two plant sources, Chrysanthemum coronarium and Sequoia sempervirens, showed nematicidal activity at ARO and UCD, respectively. Attempts to purify an active compound from S. sempervirens failed, but preliminary results from C. coronarium are judged to form a potential basis for further work at ARO. These results highlight the problems of studying complex movement patterns in sentient organisms like nematodes and the issues associated with natural product isolation from complex mixtures. Those two difficulties combined with complications now associated with obtaining US visas, slowed and ultimately limited progress on this project. As a result, US investigators expended only 65% of the $207,400 originally planned for this project. The Israeli side of the project advanced more directly toward its scientific goals and lists its expenditures in the customary financial report.

4

Andrews, Matt. Getting Real about Unknowns in Complex Policy Work. Research on Improving Systems of Education (RISE), November 2021. http://dx.doi.org/10.35489/bsg-rise-wp_2021/083.

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As with all public policy work, education policies are demanding. Policy workers need to ‘know’ a lot—about the problems they are addressing, the people who need to be engaged, the promises they can make in response, the context they are working in, and the processes they will follow to implement. Most policy workers answer questions about such issues within the structures of plan and control processes used to devise budgets and projects. These structures limit their knowledge gathering, organization and sense-making activities to up-front planning activities, and even though sophisticated tools like Theories of Change suggest planners ‘know’ all that is needed for policy success, they often do not. Policies are often fraught with ‘unknowns’ that cannot be captured in passive planning processes and thus repeatedly undermine even the best laid plans. Through a novel strategy that asks how much one knows about the answers to 25 essential policy questions, and an application to recent education policy interventions in Mozambique, this paper shows that it is possible to get real about unknowns in policy work. Just recognizing these unknowns exist—and understanding why they do and what kind of challenge they pose to policy workers—can help promote a more modest and realistic approach to doing complex policy work.

5

Panko, Mary. Undergraduate Research: A Source for Faculty Publications? Unitec ePress, April 2014. http://dx.doi.org/10.34074/ocds.002.

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Over the last two decades undergraduate students have been encouraged to problem solve in ‘the real world’ in order to construct their own subject knowledge. This generally means that students are required to carry out research in their disciplines, a process which inevitably leads to the production of quantities of data. Once their findings are reported back to faculty and have been graded, they are largely ignored, as they are ‘only’ the product of undergraduate research. However, since 2000 there has been a move to bring this type of work into the open through undergraduate research conferences in order to benefit both the students and their institutions. Nevertheless, except for a few publications within medical teaching, faculty themselves have not widely used this data for their own research, perhaps fearing its potential lack of authenticity or credibility. This paper explores a case study to examine the validity and reliability of students’ findings and considers whether the observations obtained by students can or should be made into academic publications by staff. This study comprised four cohorts, totaling 109 second-year undergraduate automotive students, who had made repeat visits to a number of automotive workshops and reviewed the workshops’ activities with a particular focus on customer service, health and safety, and waste management. Analysis of the top 25% of students’ reports revealed that a number of compliance failures were appearing on such a regular basis that these findings should be brought to the attention of the automotive industry. The paper concludes with a recommendation that under carefully controlled conditions, academics should draw on this hitherto ignored seam of research data.

6

Panko, Mary. Undergraduate Research: A Source for Faculty Publications? Unitec ePress, April 2014. http://dx.doi.org/10.34074/ocds.002.

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Over the last two decades undergraduate students have been encouraged to problem solve in ‘the real world’ in order to construct their own subject knowledge. This generally means that students are required to carry out research in their disciplines, a process which inevitably leads to the production of quantities of data. Once their findings are reported back to faculty and have been graded, they are largely ignored, as they are ‘only’ the product of undergraduate research. However, since 2000 there has been a move to bring this type of work into the open through undergraduate research conferences in order to benefit both the students and their institutions. Nevertheless, except for a few publications within medical teaching, faculty themselves have not widely used this data for their own research, perhaps fearing its potential lack of authenticity or credibility. This paper explores a case study to examine the validity and reliability of students’ findings and considers whether the observations obtained by students can or should be made into academic publications by staff. This study comprised four cohorts, totaling 109 second-year undergraduate automotive students, who had made repeat visits to a number of automotive workshops and reviewed the workshops’ activities with a particular focus on customer service, health and safety, and waste management. Analysis of the top 25% of students’ reports revealed that a number of compliance failures were appearing on such a regular basis that these findings should be brought to the attention of the automotive industry. The paper concludes with a recommendation that under carefully controlled conditions, academics should draw on this hitherto ignored seam of research data.

7

Panko, Mary. Undergraduate Research: A Source for Faculty Publications? Unitec ePress, April 2014. http://dx.doi.org/10.34074/ocds.002.

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Over the last two decades undergraduate students have been encouraged to problem solve in ‘the real world’ in order to construct their own subject knowledge. This generally means that students are required to carry out research in their disciplines, a process which inevitably leads to the production of quantities of data. Once their findings are reported back to faculty and have been graded, they are largely ignored, as they are ‘only’ the product of undergraduate research. However, since 2000 there has been a move to bring this type of work into the open through undergraduate research conferences in order to benefit both the students and their institutions. Nevertheless, except for a few publications within medical teaching, faculty themselves have not widely used this data for their own research, perhaps fearing its potential lack of authenticity or credibility. This paper explores a case study to examine the validity and reliability of students’ findings and considers whether the observations obtained by students can or should be made into academic publications by staff. This study comprised four cohorts, totaling 109 second-year undergraduate automotive students, who had made repeat visits to a number of automotive workshops and reviewed the workshops’ activities with a particular focus on customer service, health and safety, and waste management. Analysis of the top 25% of students’ reports revealed that a number of compliance failures were appearing on such a regular basis that these findings should be brought to the attention of the automotive industry. The paper concludes with a recommendation that under carefully controlled conditions, academics should draw on this hitherto ignored seam of research data.