Готові списки джерел за темами / Vector systems

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Добірка наукової літератури з теми "Vector systems"

Автор: Grafiati
Опубліковано: 10 січня 2023
Оновлено: 28 січня 2023

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Статті в журналах з теми "Vector systems"

1

Boguslavsky, I. A. "A Bayes Estimator of Parameters of Nonlinear Dynamic Systems." Mathematical Problems in Engineering 2009 (2009): 1–21. http://dx.doi.org/10.1155/2009/801475.

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A new multipolynomial approximations algorithm (the MPA algorithm) is proposed for estimating the state vectorθof virtually any dynamical (evolutionary) system. The input of the algorithm consists of discrete-time observationsY. An adjustment of the algorithm is required to the generation of arrays of random sequences of state vectors and observations scalars corresponding to a given sequence of time instants. The distributions of the random factors (vectors of the initial states and random perturbations of the system, scalars of random observational errors) can be arbitrary but have to be prescribed beforehand. The output of the algorithm is a vector polynomial series with respect to products of nonnegative integer powers of the results of real observations or some functions of these results. The sum of the powers does not exceed some given integerd. The series is a vector polynomial approximation of the vectorE(θ∣Y), which is the conditional expectation of the vector under evaluation (or given functions of the components of that vector). The vector coefficients of the polynomial series are constructed in such a way that the approximation errors uniformly tend to zero as the integerdincreases. These coefficients are found by the Monte-Carlo method and a process of recurrent calculations that do not require matrix inversion.
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2

Jacobs, William R., Scott B. Snapper, Margareta Tuckman, and Barry R. Bloom. "Mycobacteriophage Vector Systems." Clinical Infectious Diseases 11, Supplement_2 (March 1, 1989): S404—S410. http://dx.doi.org/10.1093/clinids/11.supplement_2.s404.

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3

Rizkallah, Sandra, Amir F. Atiya, and Samir Shaheen. "New Vector-Space Embeddings for Recommender Systems." Applied Sciences 11, no. 14 (July 13, 2021): 6477. http://dx.doi.org/10.3390/app11146477.

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In this work, we propose a novel recommender system model based on a technology commonly used in natural language processing called word vector embedding. In this technology, a word is represented by a vector that is embedded in an n-dimensional space. The distance between two vectors expresses the level of similarity/dissimilarity of their underlying words. Since item similarities and user similarities are the basis of designing a successful collaborative filtering, vector embedding seems to be a good candidate. As opposed to words, we propose a vector embedding approach for learning vectors for items and users. There have been very few recent applications of vector embeddings in recommender systems, but they have limitations in the type of formulations that are applicable. We propose a novel vector embedding that is versatile, in the sense that it is applicable for the prediction of ratings and for the recommendation of top items that are likely to appeal to users. It could also possibly take into account content-based features and demographic information. The approach is a simple relaxation algorithm that optimizes an objective function, defined based on target users’, items’ or joint user–item’s similarities in their respective vector spaces. The proposed approach is evaluated using real life datasets such as “MovieLens”, “ModCloth”, “Amazon: Magazine_Subscriptions” and “Online Retail”. The obtained results are compared with some of the leading benchmark methods, and they show a competitive performance.
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4

Sun, Mingbao Sun, and Xiaoping Yang Yang. "Inequalities for vector systems." Acta Mathematica Hungarica 111, no. 1-2 (April 2006): 9–28. http://dx.doi.org/10.1007/s10474-006-0031-y.

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5

Klíč, Alois, and Jan Řeháček. "On systems governed by two alternating vector fields." Applications of Mathematics 39, no. 1 (1994): 57–64. http://dx.doi.org/10.21136/am.1994.134243.

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6

Yew, Chee-Hong Takahiro, Narmatha Gurumoorthy, Fazlina Nordin, Gee Jun Tye, Wan Safwani Wan Kamarul Zaman, Jun Jie Tan, and Min Hwei Ng. "Integrase deficient lentiviral vector: prospects for safe clinical applications." PeerJ 10 (August 12, 2022): e13704. http://dx.doi.org/10.7717/peerj.13704.

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HIV-1 derived lentiviral vector is an efficient transporter for delivering desired genetic materials into the targeted cells among many viral vectors. Genetic material transduced by lentiviral vector is integrated into the cell genome to introduce new functions, repair defective cell metabolism, and stimulate certain cell functions. Various measures have been administered in different generations of lentiviral vector systems to reduce the vector’s replicating capabilities. Despite numerous demonstrations of an excellent safety profile of integrative lentiviral vectors, the precautionary approach has prompted the development of integrase-deficient versions of these vectors. The generation of integrase-deficient lentiviral vectors by abrogating integrase activity in lentiviral vector systems reduces the rate of transgenes integration into host genomes. With this feature, the integrase-deficient lentiviral vector is advantageous for therapeutic implementation and widens its clinical applications. This short review delineates the biology of HIV-1-erived lentiviral vector, generation of integrase-deficient lentiviral vector, recent studies involving integrase-deficient lentiviral vectors, limitations, and prospects for neoteric clinical use.
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7

Vassiliou, P. C. G., A. C. Georgiou, and N. Tsantas. "Control of asymptotic variability in non-homogeneous Markov systems." Journal of Applied Probability 27, no. 4 (December 1990): 756–66. http://dx.doi.org/10.2307/3214820.

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In this paper we provide two basic results. First, we find the set of all the limiting vectors of expectations, variances and covariances in an NHMS which are possible provided that we control the limit vector of the sequence of vectors of input probabilities. Secondly, under certain conditions easily met in practice we find the distribution of the limiting vector of expectations, variances and covariances to be multinomial with probabilities the corresponding limiting expected populations in the various states of the NHMS.
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8

Vassiliou, P. C. G., A. C. Georgiou, and N. Tsantas. "Control of asymptotic variability in non-homogeneous Markov systems." Journal of Applied Probability 27, no. 04 (December 1990): 756–66. http://dx.doi.org/10.1017/s0021900200027947.

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In this paper we provide two basic results. First, we find the set of all the limiting vectors of expectations, variances and covariances in an NHMS which are possible provided that we control the limit vector of the sequence of vectors of input probabilities. Secondly, under certain conditions easily met in practice we find the distribution of the limiting vector of expectations, variances and covariances to be multinomial with probabilities the corresponding limiting expected populations in the various states of the NHMS.
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9

Heck, Michelle. "Insect Transmission of Plant Pathogens: a Systems Biology Perspective." mSystems 3, no. 2 (March 20, 2018): e00168-17. http://dx.doi.org/10.1128/msystems.00168-17.

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ABSTRACT Insect-vectored pathogens pose one of the greatest threats to plant and animal, including human, health on a global scale. Few effective control strategies have been developed to thwart the transmission of any insect-transmitted pathogen. Most have negative impacts on the environment and human health and are unsustainable. Plant pathogen transmission by insect vectors involves a combination of coevolving biological players: plant hosts, insect vectors, plant pathogens, and bacterial endosymbionts harbored by the insect. Our ability to help growers to control vector-borne disease depends on our ability to generate pathogen- and/or disease-resistant crops by traditional or synthetic approaches and to block pathogen transmission by the insect vector. Systems biology studies have led to the reexamination of existing paradigms on how pathogens interact with insect vectors, including the bacterial symbionts, and have identified vector-pathogen interactions at the molecular and cellular levels for the development of novel transmission interdiction strategies.
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10

Matusov, L. B. "VECTOR OPTIMIZATION OF A СОMPLICATED INTELLECTUAL AND MECHANICAL SYSTEMS". European Journal of Natural History, № 5 2019 (2019): 70–74. http://dx.doi.org/10.17513/ejnh.34017.

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Дисертації з теми "Vector systems"

1

Bharadwaj, Aravind S. "Vector controlled induction motor drive systems." Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06062008-172143/.

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2

Topham, N. P. "A parallel vector processing system." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370965.

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3

O'Connell, Heath B. "Vector meson models of strongly interacting systems /." Title page, abstract and table of contents only, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09pho175.pdf.

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4

Hammam, Yasser, and n/a. "Geographical vector agents." University of Otago. Department of Information Science, 2008. http://adt.otago.ac.nz./public/adt-NZDU20080404.150839.

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Simulating geographic phenomena in a realistic and plausible way requires real-world entities to be abstracted based on the dynamic physical characteristics they exhibit, and treated as individuals in a simulation domain. These processes cannot be adequately supported by the traditional spatial model based on cellular-space such as Cellular Automata (CA). Although this approach has received a great attention as a most favoured technique for simulating the geographic phenomena from different aspects, the need for a generic spatial model to overcome the limitations encountered in such an approach has been raised. This applies particularly to the way real-world entities are represented in a simulation domain regarding their physical characteristics and temporal aspects. In this thesis, a new computational approach for a spatial model suitable for simulating geographic phenomena is presented: the vector agents model. The vector agent is goal-oriented, adaptable, physically defined by an Euclidean geometry and able to change its own geometric characteristics while interacting with other agents in its neighbourhood using a set of rules. The agent is modelled with sensor, state, and strategies. The successful implementation of the model�s architecture allows the representation of the physical characteristics of real-world entities and to observe their complex and dynamic behaviour in a simulation domain. Vector agents have developed out of a need to create a systematic basis for the geometric components of Geographic Automata Systems (GAS), as outlined by Torrens and Benenson (2005). A generic vector agents model was built, then tested and validated from different aspects, from which results demonstrated the model�s efficiency. It is confirmed that vector agents are flexible in producing different complex shapes and patterns for recreating real geographic phenomena through the generic use of three algorithms of geometric manipulation: midpoint displacement by using the relaxed Brownian Motion (fractal-like) algorithm, edge displacement and vertex displacement. The effectiveness of this was initially ascertained visually. A simple heuristic to govern shape growth rate and complexity was derived based on the interplay of the three algorithms. There was a further abstract model comparison against the cellular-agents environment, with the result that vector agents have the ability to emerge patterns similar to what can be produced by cellular-agents with the advantage of representing entities as individuals with their own attributes with realistic geometric boundaries. On the other hand, the city as a complex geographic phenomenon was used as a specific domain for validating the model with a real-world system. The results of the urban land use simulations (driven by simple rules based on three classical urban theories) confirmed that: (a) the model is flexible enough to incorporate various external rules based on real-world systems and (b) the model has a sufficient capability in emerging a variety of patterns under several environments close to actual patterns. The agent environment also proved to be an effective way of easily combining the rules associated with each urban theory (different agents behaved according to different theories). Finally, limitations raised through the development of this work are addressed leading to outline possible extensions of both model computation and the domain of applications.
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5

Jas, Abhijit. "Test vector compression techniques for systems-on-chip /." Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3008359.

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6

Li, Xiaopeng. "Moving base INS/GPS vector gravimetry on a land vehicle." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1195677222.

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7

Xiao, Yu. "Evaluation of Test Vector Quality for Hybrid Systems." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-347562.

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When testing is performed, a large number of test vectors representing series of signal values are input to the applications under development, and the results of the testing are then analyzed by checking violations of defined safety requirements. However, there is usually limited time, personnel and other resources. Selecting a subset of test vectors with better qualities is one of the possible ways in order to bring down the costs for testing-related activities.This thesis work aims at evaluating and quantifying the qualities of test vectors for a hybrid system. Two possible criteria for good qualities are proposed, evaluated and quantified for test vectors that are input to a hybrid application at Volvo Cars. For validation and analyses purposes, the semantics of Signal Temporal Logic (STL) and its robustness satisfaction are introduced and monitored with the Matlab/Simulink Toolbox Breach. The conclusion is that the method we proposed to evaluate and quantify the qualities of test vectors is able to satisfy the needs from Volvo Cars by far. With the experiences we have at present, however, it is not sufficiently proven that test vectors with higher qualities assessed by our method behave better when the robustness satisfaction of STL formulas is monitored. Nevertheless, it is a good beginning to relate the robustness satisfaction of STL semantics to test vector quality evaluation for people with similar goals to consider in the future.
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8

Schreiber, Veronika. "Special vector configurations in geometry and integrable systems." Thesis, Loughborough University, 2014. https://dspace.lboro.ac.uk/2134/14695.

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The main objects of study of the thesis are two classes of special vector configurations appeared in the geometry and the theory of integrable systems. In the first part we consider a special class of vector configurations known as the V-systems, which appeared in the theory of the generalised Witten-Dijkgraaf-Verlinde-Verlinde (WDVV) equations. Several families of V-systems are known, but their classification is an open problem. We derive the relations describing the infinitesimal deformations of V-systems and use them to study the classification problem for V-systems in dimension 3. In particular, we prove that the isolated cases in Feigin-Veselov list admit only trivial deformations. We present the catalogue of all known 3D V-systems including graphical representations of the corresponding matroids and values of v-functions. In the second part we study the vector configurations, which form vertex sets for a new class of polyhedra called affine B-regular. They are defined by a 3-dimensional analogue of the Buffon procedure proposed by Veselov and Ward. The main result is the proof of existence of star-shaped affine B-regular polyhedron with prescribed combinatorial structure, under partial symmetry and simpliciality assumptions. The proof is based on deep results from spectral graph theory due to Colin de Verdière and Lovász.
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9

Bushman, Nathan. "Hypercomplex Numbers and Early Vector Systems: A History." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1585666516546138.

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Payn, Martin. "Flux vector control of asynchronous machines." Thesis, University of Surrey, 1991. http://epubs.surrey.ac.uk/844608/.

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The present work introduces the dynamic induction machine model using the concept of space vector notation, and shows the fundamentals of torque production to be related to the current and flux space vector interaction. By theoretical analysis the transient response of the current and voltage fed machine is determined in terms of the machine eigenvalues, and this is confirmed using simulation techniques. The concept of torque control using the current and flux space vectors' magnitude and phase is introduced. It is shown that maintaining the flux space vector's magnitude constant is a sensible approach and that transient free torque responses are possible by controlling the current space vector magnitude and phase with respect to the flux space vector, which is termed vector control. Previously only magnitude control was realised, and this is termed scalar control. It is shown that the simplest practical vector controllers work in the rotating rotor flux space vector reference frame, generated from a dynamic machine model using current and speed/position measurements from the real machine. The major disadvantage of the parameter sensitivity of this approach is examined. To complement the theoretical analysis a practical vector controller was to be built. This was designed around a new DSP micro-controller (TMS320C14) and featured a 10 kHz sampling rate. A fully instrumented 7.5 kW test rig was also developed with the induction machine driven from a modified 1 kHz inverter. The measurement of high performance shaft torque is investigated, to allow comparisons between the theoretical and practical results. The practical work centred on the comparison of the dynamic machine model with measurements made on the real machine (torque and flux) and with the theory. These showed excellent steady state performance but the dynamic response was disappointing. The implications of the model not representing the real machine transiently are investigated.
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Книги з теми "Vector systems"

1

Salabura, Piotr. Vector mesons in strongly interacting systems. Kraków: Wydawn. Uniwersytetu Jagiellońskiego, 2003.

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2

Resch, Michael, Thomas Bönisch, Katharina Benkert, Wolfgang Bez, Toshiyuki Furui, and Yoshiki Seo, eds. High Performance Computing on Vector Systems. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/3-540-35074-8.

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3

Huang, Nianqing. Supervisory control of vector discrete-event systems. Ottawa: National Library of Canada = Bibliothèque nationale du Canada, 1991.

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4

Liao, Jie. Hierarchical control in vector discrete-event systems. Ottawa: National Library of Canada = Bibliothèque nationale du Canada, 1992.

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5

Teraflop Workbench Project Workshop (7th 2007 Stuttgart, Germany). High performance computing on vector systems 2007. Edited by Resch Michael and Teraflop Workbench Project Workshop (6th : 2006 : Sendai, Japan). Berlin: Springer, 2008.

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6

Resch, Michael, Katharina Benkert, Xin Wang, Martin Galle, Wolfgang Bez, Hiroaki Kobayashi, and Sabine Roller, eds. High Performance Computing on Vector Systems 2010. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-11851-7.

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7

Resch, Michael, Xin Wang, Wolfgang Bez, Erich Focht, Hiroaki Kobayashi, and Sabine Roller, eds. High Performance Computing on Vector Systems 2011. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-22244-3.

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8

Resch, Michael, Sabine Roller, Peter Lammers, Toshiyuki Furui, Martin Galle, and Wolfgang Bez, eds. High Performance Computing on Vector Systems 2007. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-74384-2.

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Resch, Michael, Sabine Roller, Katharina Benkert, Martin Galle, Wolfgang Bez, and Hiroaki Kobayashi, eds. High Performance Computing on Vector Systems 2009. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-03913-3.

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Resch, Michael, Thomas Bönisch, Sunil Tiyyagura, Toshiyuki Furui, Yoshiki Seo, and Wolfgang Bez, eds. High Performance Computing on Vector Systems 2006. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-68743-6.

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Частини книг з теми "Vector systems"

1

Ukil, Abhisek. "Support Vector Machine." In Power Systems, 161–226. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-73170-2_4.

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Anastassiou, George A., and Iuliana F. Iatan. "Vector Spaces." In Intelligent Systems Reference Library, 1–58. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01967-3_1.

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Rapcsák, Tamás. "On Vector Complementarity Systems and Vector Variational Inequalities." In Vector Variational Inequalities and Vector Equilibria, 371–80. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4613-0299-5_22.

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4

Hernández, Vicente, and Enrique S. Quintana-Ortí. "Stabilizing large control linear systems on multicomputers." In Vector and Parallel Processing — VECPAR'96, 338–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/3-540-62828-2_129.

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Castillo, Maribel, Enrique S. Quintana-Ortí, Gregorio Quintana-Ortí, and Vicente Hernández. "Parallel Pole Assignment of Single-Input Systems." In Vector and Parallel Processing — VECPAR 2000, 395–402. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-44942-6_32.

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García-Loureiro, Antonio J., Tomás F. Pena, J. M. López-González, and Ll Prat Viñas. "Parallel Preconditioners for Solving Nonsymmetric Linear Systems." In Vector and Parallel Processing – VECPAR’98, 128–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/10703040_11.

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Vuillemin, Jean. "Reconfigurable Systems: Past and Next 10 Years." In Vector and Parallel Processing – VECPAR’98, 334–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/10703040_26.

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García, F., J. Carretero, F. Pérez, and P. de Miguel. "High Performance Cache Management for Parallel File Systems." In Vector and Parallel Processing – VECPAR’98, 466–79. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/10703040_35.

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Urland, Erik. "Parallel computing of fragment vector in Steiner triple systems." In Vector and Parallel Processing — VECPAR'96, 326–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/3-540-62828-2_128.

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Sousa, Leonel, and Oliver Sinnen. "Synchronous Non-local Image Processing on Orthogonal Multiprocessor Systems." In Vector and Parallel Processing — VECPAR 2000, 453–66. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-44942-6_37.

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Тези доповідей конференцій з теми "Vector systems"

1

Leroux, Jerome. "Presburger Vector Addition Systems." In 2013 Twenty-Eighth Annual IEEE/ACM Symposium on Logic in Computer Science (LICS 2013). IEEE, 2013. http://dx.doi.org/10.1109/lics.2013.7.

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Wu, Henry T., and Neel K. Mani. "Modeling of Flexible Bodies for Dynamic Analysis of Multi-Body Dynamic Systems Using Ritz Vectors." In ASME 1991 Design Technical Conferences. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/detc1991-0146.

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Abstract Vibration normal modes and static correction modes have been previously used to model flexible bodies for dynamic analysis of mechanical systems. The efficiency and accuracy of using these modes to model a system depends on both the flexibility of each body and the applied loads. This paper develops a generalized method for the generation of a set of Ritz vectors to model flexible bodies for dynamic analysis of multi-body mechanical systems. The Ritz vectors are generated using the distribution of dynamic loading on a flexible body. Therefore they form the most efficient vector basis for the spatial distribution of the loadings. The Ritz vectors can be re-generated when the system undergoes significant changes of its configuration and the regeneration procedure is inexpensive. The combinations of vibration normal modes and the proposed Ritz vectors thus form more efficient and accurate vector bases for the modeling of flexible bodies for dynamic analysis.
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3

Belyakova, N. A., and V. V. Lazareva. "State information systems as a tool for determining the need for social support." In RUSSIA AND CHINA: A VECTOR OF DEVELOPMENT. Amur State University, 2019. http://dx.doi.org/10.22250/rc.2019.1.31.

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Jia, Yuheng, Sam Kwong, Wenhui Wu, Wei Gao, and Ran Wang. "Generalized relevance vector machine." In 2017 Intelligent Systems Conference (IntelliSys). IEEE, 2017. http://dx.doi.org/10.1109/intellisys.2017.8324361.

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5

Oparin, G. A., V. G. Bogdanova, and A. A. Pashinin. "Application of binary dynamical systems in the problem of classification of Boolean vectors." In 1st International Workshop on Advanced Information and Computation Technologies and Systems 2020. Crossref, 2021. http://dx.doi.org/10.47350/aicts.2020.15.

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The article proposes a method based on using binary dynamical systems in the classification problem for Boolean vectors (binary feature vectors). This problem has practical application in various fields of science and industry, for example, bioinformatics, remote sensing of natural objects, smart devices of the Internet of things, etc. Binary synchronous autonomous nonlinear dynamic models with an unknown characteristic matrix are considered. Matrix elements are chosen in such a way that the Boolean reference vectors are equilibrium states of the binary dynamic model. The attraction regions of equilibrium states act as classes (one reference vector corresponds to each class). The classified vector is the initial state of the model. Simple and aggregated classifiers are considered. The proposed method is demonstrated using an illustrative example.
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6

Lin, Shih-Chun, and Hsuan-Jung Su. "Vector Wyner-Ziv coding for vector Gaussian CEO problem." In 2007 41st Annual Conference on Information Sciences and Systems. IEEE, 2007. http://dx.doi.org/10.1109/ciss.2007.4298324.

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7

Kostov, Nikolay A., Vladimir S. Gerdjikov, and Tihomir I. Valchev. "Multicomponent Nonlinear Systems of Bose-Fermi Fields: Exact Solutions." In INTERNATIONAL WORKSHOP ON COMPLEX STRUCTURES, INTEGRABILITY AND VECTOR FIELDS. AIP, 2011. http://dx.doi.org/10.1063/1.3567130.

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8

Bongsoo Jung and Byeungwoo Jeon. "Pooled zero vector coding for enhanced compression of motion vectors." In APCCAS 2008 - 2008 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS). IEEE, 2008. http://dx.doi.org/10.1109/apccas.2008.4746377.

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9

Kumar, Nishant, and Thomas D. Burton. "On Combined Use of POD Modes and Ritz Vectors for Model Reduction in Nonlinear Structural Dynamics." In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-87416.

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An approach to develop Proper Orthogonal Decomposition (POD) based reduced order models for systems with local nonlinearities is presented in this paper. This technique is applied to multi-degree of freedom systems of coupled oscillators with isolated nonlinear elements. Typically, reduced order models are obtained using POD modes exclusively. In this work, we explore the suitability of using a combination of POD modes and other physically based “Ritz vectors” to produce the reduced model. The objectives are 1). to improve the accuracy of the reduced order differential equation model and 2). to expand the range of system parameters for which the reduced basis provides reasonably accurate approximations. The “Ritz vectors” used in this work are static displacement vectors that are calculated in one of the following three ways: 1). “Load – based Ritz vectors” [1, 2, 7, 8, 12, 16–18] – This is the static displacement vector due to a static loading that is proportional to the static version of the actual (assumed dynamic) loading to which the structure is subjected. 2). “Milman – Chu vectors” [3] – This is the static Ritz vector due to the imposition of equal and opposite static loads on the two masses to which the non-linear element is connected. The loading used to generate the first M – C vector is dictated by the location of the non-linearity. 3). “K – B (Kumar – Burton) vector” – This is a new Ritz vector defined in the spirit of the Milman – Chu vector. The K – B vector is the static displacement vector due to the imposition of a). equal and opposite static loads on the two masses to which the nonlinear element is connected (i.e. same as M – C loading) and b). equal and opposite static loads on the nearest neighbors. Thus, four masses are statically loaded. As for the M – C vector, the K – B loading is dictated by the location of the nonlinear element. The nonlinear model is numerically integrated to generate a full ODE model solution, which we call the “baseline solution”. We select a set of POD modes of the baseline nonlinear system response as basis functions. The POD modes are then augmented by various combinations of the three aforementioned Ritz vectors to generate reduced order models for system having parameters in vicinity of baseline system parameters. Our results indicate that the K – B augmentation vector combined with the Milman – Chu vector is an effective way to account for nonlinear effects for the system considered. The use of combined M – C/K – B augmentation also expands the range of system parameters for which the baseline POD modes provide accurate reduction. This is considered to be a significant result.
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10

Youm, Y., and T. Yih. "On the Displacement Analysis of Open-Loop Systems by the Direction Cosine Matrix Method." In ASME 1987 Design Technology Conferences. American Society of Mechanical Engineers, 1987. http://dx.doi.org/10.1115/detc1987-0108.

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Abstract In this paper, displacement analysis of a general spatial open-loop system and a computer algorithm for the workspace of the system are developed by applying the direction cosine matrix method. In using this method, one global coordinate system and two joint local coordinate systems must be predefined in order to formulate the direction cosine transformation matrices of the unit vectors of each joint axis and link vector. The 3 × 3 direction cosine transformation matrices for each joint axis and link vector are established based on the known geometric configurations, the preceding unit vectors, and the cofactor property of the direction cosine matrix. The use of cofactor property will provide a unique solution for the transformation matrix. A computer algorithm is developed to illustrate the workspace of spatial n-R open-loop systems projected onto the coordinate X-Y, Y-Z, and X-Z planes. Numerical examples are demonstrated for an industrial robot, an application to human upper extremity, and a hypothetical 9-link open-loop system.
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Звіти організацій з теми "Vector systems"

1

Endy, Timothy P., and Stephen J. Thomas. Global Positioning Systems (GPS) Technology to Study Vector-Pathogen-Host Interactions. Fort Belvoir, VA: Defense Technical Information Center, October 2013. http://dx.doi.org/10.21236/ada612532.

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2

Hackett, Kevin, Shlomo Rottem, David L. Williamson, and Meir Klein. Spiroplasmas as Biological Control Agents of Insect Pests. United States Department of Agriculture, July 1995. http://dx.doi.org/10.32747/1995.7613017.bard.

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Toward development of spiroplasmas as novel toxin-delivery systems for biocontrol of beetle pests in the United States (Leptinotarsa decemlineata) and Israel (Maladera matrida), media for cultivating beetle-associated spiroplasmas were improved and surveys of these spiroplasmas were conducted to provide transformable strains. Extensive surveys of spiroplasmas yielded promising extrachromosomal elements for vector constructs. One, plasmid pCT-1, was cloned, characterized, and used as a source of spiroplasma origin of replication in our shuttle vectors. The fibrillin gene was isolated and sequenced and its strong promoter was also used in the constructs. Means for transforming these vectors into spiroplasmas were developed and optimized, with electroporation found to be suitable for most applications. Development and optimization of means for using large unilamellar vesicles (LUVs) in spiroplasma transformation represents a breakthrough that should facilitate insertion of large clusters of virulence genes. With completion of the vector, we should thus be poised to genetically engineer spiroplasmas with genes that will express toxins lethal to our target beetles, thus providing an effective and inexpensive alternative to conventional means of beetle control.
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3

Gottlieb, Yuval, Bradley Mullens, and Richard Stouthamer. investigation of the role of bacterial symbionts in regulating the biology and vector competence of Culicoides vectors of animal viruses. United States Department of Agriculture, June 2015. http://dx.doi.org/10.32747/2015.7699865.bard.

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Symbiotic bacteria have been shown to influence host reproduction and defense against biotic and abiotic stressors, and this relates to possible development of a symbiont-based control strategy. This project was based on the hypothesis that symbionts have a significant impact on Culicoides fitness and vector competence for animal viruses. The original objectives in our proposal were: 1. Molecular identification and localization of the newly-discovered symbiotic bacteria within C. imicola and C. schultzei in Israel and C. sonorensis in California. 2. Determination of the prevalence of symbiotic bacteria within different vector Culicoides populations. 3. Documentation of specific symbiont effects on vector reproduction and defense: 3a) test for cytoplasmic incompatibility in Cardinium-infected species; 3b) experimentally evaluate the role of the symbiont on infection or parasitism by key Culicoides natural enemies (iridescent virus and mermithid nematode). 4. Testing the role(s) of the symbionts in possible protection against infection of vector Culicoides by BTV. According to preliminary findings and difficulties in performing experimental procedures performed in other insect symbiosis systems where insect host cultures are easily maintained, we modified the last two objectives as follows: Obj. 3, we tested how symbionts affected general fitness of Israeli Culicoides species, and thoroughly described and evaluated the correlation between American Culicoides and their bacterial communities in the field. We also tried alternative methods to test symbiont-Culicoides interactions and launched studies to characterize low-temperature stress tolerances of the main US vector, which may be related to symbionts. Obj. 4, we tested the correlation between EHDV (instead of BTV) aquisition and Cardinium infection. Culicoides-bornearboviral diseases are emerging or re-emerging worldwide, causing direct and indirect economic losses as well as reduction in animal welfare. One novel strategy to reduce insects’ vectorial capacity is by manipulating specific symbionts to affect vector fitness or performance of the disease agent within. Little was known on the bacterial tenants occupying various Culicoides species, and thus, this project was initiated with the above aims. During this project, we were able to describe the symbiont Cardinium and whole bacterial communities in Israeli and American Culicoides species respectively. We showed that Cardinium infection prevalence is determined by land surface temperature, and this may be important to the larval stage. We also showed no patent significant effect of Cardinium on adult fitness parameters. We showed that the bacterial community in C. sonorensis varies significantly with the host’s developmental stage, but it varies little across multiple wastewater pond environments. This may indicate some specific biological interactions and allowed us to describe a “core microbiome” for C. sonorensis. The final set of analyses that include habitat sample is currently done, in order to separate the more intimately-associated bacteria from those inhabiting the gut contents or cuticle surface (which also could be important). We were also able to carefully study other biological aspects of Culicoides and were able to discriminate two species in C. schultzei group in Israel, and to investigate low temperature tolerances of C. sonorensis that may be related to symbionts. Scientific implications include the establishment of bacterial identification and interactions in Culicoides (our work is cited in other bacteria-Culicoides studies), the development molecular identification of C. schultzei group, and the detailed description of the microbiome of the immature and matched adult stages of C. sonorensis. Agricultural implications include understanding of intrinsic factors that govern Culicoides biology and population regulation, which may be relevant for vector control or reduction in pathogen transmission. Being able to precisely identify Culicoides species is central to understanding Culicoides borne disease epidemiology.
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4

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.
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5

Zelenskyi, Arkadii A. Relevance of research of programs for semantic analysis of texts and review of methods of their realization. [б. в.], December 2018. http://dx.doi.org/10.31812/123456789/2884.

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One of the main tasks of applied linguistics is the solution of the problem of high-quality automated processing of natural language. The most popular methods for processing natural-language text responses for the purpose of extraction and representation of semantics should be systems that are based on the efficient combination of linguistic analysis technologies and analysis methods. Among the existing methods for analyzing text data, a valid method is used by the method using a vector model. Another effective and relevant means of extracting semantics from the text and its representation is the method of latent semantic analysis (LSA). The LSA method was tested and confirmed its effectiveness in such areas of processing the native language as modeling the conceptual knowledge of the person; information search, the implementation of which LSA shows much better results than conventional vector methods.
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6

Shapira, Roni, Judith Grizzle, Nachman Paster, Mark Pines, and Chamindrani Mendis-Handagama. Novel Approach to Mycotoxin Detoxification in Farm Animals Using Probiotics Added to Feed Stuffs. United States Department of Agriculture, May 2010. http://dx.doi.org/10.32747/2010.7592115.bard.

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T-2 toxin, a toxic product belongs to the trichothecene mycotoxins, attracts major interest because of its severe detrimental effects on the health of human and farm animals. The occurrence of trichothecenes contamination is global and they are very resistant to physical or chemical detoxification techniques. Trichothecenes are absorbed in the small intestine into the blood stream. The hypothesis of this project was to develop a protecting system using probiotic bacteria that will express trichothecene 3-O-acetyltransferase (Tri101) that convert T-2 to a less toxic intermediate to reduce ingested levels in-situ. The major obstacle that we had faced during the project is the absence of stable and efficient expression vectors in probiotics. Most of the project period was invested to screen and isolate strong promoter to express high amounts of the detoxify enzyme on one hand and to stabilize the expression vector on the other hand. In order to estimate the detoxification capacity of the isolated promoters we had developed two very sensitive bioassays.The first system was based on Saccharomyces cerevisiae cells expressing the green fluorescent protein (GFP). Human liver cells proliferation was used as the second bioassay system.Using both systems we were able to prove actual detoxification on living cells by probiotic bacteria expressing Tri101. The first step was the isolation of already discovered strong promoters from lactic acid bacteria, cloning them downstream the Tri101 gene and transformed vectors to E. coli, a lactic acid bacteria strain Lactococcuslactis MG1363, and a probiotic strain of Lactobacillus casei. All plasmid constructs transformed to L. casei were unstable. The promoter designated lacA found to be the most efficient in reducing T-2 from the growth media of E. coli and L. lactis. A prompter library was generated from L. casei in order to isolate authentic probiotic promoters. Seven promoters were isolated, cloned downstream Tri101, transformed to bacteria and their detoxification capability was compared. One of those prompters, designated P201 showed a relatively high efficiency in detoxification. Sequence analysis of the promoter region of P201 and another promoter, P41, revealed the consensus region recognized by the sigma factor. We further attempted to isolate an inducible, strong promoter by comparing the protein profiles of L. casei grown in the presence of 0.3% bile salt (mimicking intestine conditions). Six spots that were consistently overexpressed in the presence of bile salts were isolated and identified. Their promoter reigns are now under investigation and characterization.
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7

Garver, Robert I. Novel Vector System for Breast Cancer Therapy. Fort Belvoir, VA: Defense Technical Information Center, October 1999. http://dx.doi.org/10.21236/ada391359.

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8

Ullman, Diane, James Moyer, Benjamin Raccah, Abed Gera, Meir Klein, and Jacob Cohen. Tospoviruses Infecting Bulb Crops: Evolution, Diversity, Vector Specificity and Control. United States Department of Agriculture, September 2002. http://dx.doi.org/10.32747/2002.7695847.bard.

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Objectives. The overall goal of the proposed research was to develop a mechanistic understanding of tospovirus evolution, diversity and vector specificity that could be applied to development of novel methods for limiting virus establishment and spread. Our specific objectives were: 1) To characterize newly intercepted tospoviruses in onion, Hippeastrum and other bulb crops and compare them with the known tomato spotted wilt virus (TSWV) and its isolates; 2) To characterize intra- and interspecific variation in the virus transmission by thrips of the new and distinct tospoviruses. and, 3) To determine the basis of vector specificity using biological, cellular and molecular approaches. Background. New tospoviruses infecting bulb crops were detected in Israel and the US in the mid-90s. Their plant host ranges and relationships with thrips vectors showed they differed from the type member of the Tospovirus genus, tomato spotted wilt virus (TSWV). Outbreaks of these new viruses caused serious crop losses in both countries, and in agricultural and ornamental crops elsewhere. In the realm of plant infecting viruses, the tospoviruses (genus: Tospovirus , family: Bunyaviridae ) are among the most aggressive emerging viruses. Tospoviruses are transmitted by several species of thrips in a persistent, propagative fashion and the relationships between the viruses and their thrips vectors are often specific. With the emergence of new tospoviruses, new thrips vector/tospovirus relationships have also arisen and vector specificities have changed. There is known specificity between thrips vector species and particular tospoviruses, although the cellular and molecular bases for this specificity have been elusive. Major conclusions, solutions and achievements. We demonstrated that a new tospovirus, iris yellow spot virus (IYSV) caused "straw bleaching" in onion (Allium cepa) and lisianthus necrosis in lisianthus (Eustoma russellianum). Characterization of virus isolates revealed genetic diversity among US, Brazilian, Dutch and Israeli isolates. IYSV was not seed transmitted, and in Israel, was not located in bulbs of infected plants. In the US, infected plants were generated from infected bulbs. The relationship between IYSV and Thrips tabaci was shown to be specific. Frankliniella occidentalis, the primary vector of many other tospoviruses, did not transmit IYSV isolates in Israel or the US. Furthermore, 1': tabaci populations varied in their transmission ability. Transmission was correlated to IYSV presence in thrips salivary glands. In Israel, surveys in onion fields revealed that the onion thrips, Thrips tabaci Lindeman was the predominant species and that its incidence was strongly related to that of IYSV infection. In contrast, in the U.S., T. tabaci and F. occidentalis were present in high numbers during the times sampled. In Israel, insecticides reduced onion thrips population and caused a significant yield increase. In the US, a genetic marker system that differentiates non-thrips transmissible isolates from thrips transmissible isolate demonstrated the importance of the M RNA to thrips transmission of tospoviruses. In addition, a symbiotic Erwinia was discovered in thrips and was shown to cause significant artifacts in certain types of virus binding experiments. Implications, scientific and agricultural. Rapid emergence of distinct tospoviruses and new vector relationships is profoundly important to global agriculture. We advanced the understanding of IYSV in bulb crops and its relationships with thrips vector species. The knowledge gained provided growers with new strategies for control and new tools for studying the importance of particular viral proteins in thrips specificity and transmission efficiency.
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9

Chu, E. The Natural Coordination System for Studying Vector Problems. Office of Scientific and Technical Information (OSTI), June 2018. http://dx.doi.org/10.2172/1453837.

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10

Wilson, Thomas E., Avraham A. Levy, and Tzvi Tzfira. Controlling Early Stages of DNA Repair for Gene-targeting Enhancement in Plants. United States Department of Agriculture, March 2012. http://dx.doi.org/10.32747/2012.7697124.bard.

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Gene targeting (GT) is a much needed technology as a tool for plant research and for the precise engineering of crop species. Recent advances in this field have shown that the presence of a DNA double-strand break (DSB) in a genomic locus is critical for the integration of an exogenous DNA molecule introduced into this locus. This integration can occur via either non-homologous end joining (NHEJ) into the break or homologous recombination (HR) between the broken genomic DNA and the introduced vector. A bottleneck for DNA integration via HR is the machinery responsible for homology search and strand invasion. Important proteins in this pathway are Rad51, Rad52 and Rad54. We proposed to combine our respective expertise: on the US side, in the design of zincfinger nucleases (ZFNs) for the induction of DNA DSBs at any desired genomic locus and in the integration of DNA molecules via NHEJ; and on the Israeli side in the HR events, downstream of the DSB, that lead to homology search and strand invasion. We sought to test three major pathways of targeted DNA integration: (i) integration by NHEJ into DSBs induced at desired sites by specially designed ZFNs; (ii) integration into DSBs induced at desired sites combined with the use of Rad51, Rad52 and Rad54 proteins to maximize the chances for efficient and precise HR-mediated vector insertion; (iii) stimulation of HR by Rad51, Rad52 and Rad54 in the absence of DSB induction. We also proposed to study the formation of dsT-DNA molecules during the transformation of plant cells. dsT-DNA molecules are an important substrate for HR and NHEJ-mediatedGT, yet the mode of their formation from single stranded T-DNA molecules is still obscure. In addition we sought to develop a system for assembly of multi-transgene binary vectors by using ZFNs. The latter may facilitate the production of binary vectors that may be ready for genome editing in transgenic plants. ZFNs were proposed for the induction of DSBs in genomic targets, namely, the FtsH2 gene whose loss of function can easily be identified in somatic tissues as white sectors, and the Cruciferin locus whose targeting by a GFP or RFP reporter vectors can give rise to fluorescent seeds. ZFNs were also proposed for the induction of DSBs in artificial targets and for assembly of multi-gene vectors. We finally sought to address two important cell types in terms of relevance to plant transformation, namely GT of germinal (egg) cells by floral dipping, and GT in somatic cells by root and leave transformation. To be successful, we made use of novel optimized expression cassettes that enable coexpression of all of the genes of interest (ZFNs and Rad genes) in the right tissues (egg or root cells) at the right time, namely when the GT vector is delivered into the cells. Methods were proposed for investigating the complementation of T-strands to dsDNA molecules in living plant cells. During the course of this research, we (i) designed, assembled and tested, in vitro, a pair of new ZFNs capable of targeting the Cruciferin gene, (ii) produced transgenic plants which expresses for ZFN monomers for targeting of the FtsH2 gene. Expression of these enzymes is controlled by constitutive or heat shock induced promoters, (iii) produced a large population of transgenic Arabidopsis lines in which mutated mGUS gene was incorporated into different genomic locations, (iv) designed a system for egg-cell-specific expression of ZFNs and RAD genes and initiate GT experiments, (v) demonstrated that we can achieve NHEJ-mediated gene replacement in plant cells (vi) developed a system for ZFN and homing endonuclease-mediated assembly of multigene plant transformation vectors and (vii) explored the mechanism of dsTDNA formation in plant cells. This work has substantially advanced our understanding of the mechanisms of DNA integration into plants and furthered the development of important new tools for GT in plants.
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