Journal articles: 'Dynamic systems development method (DSDM)'

1

McClatchey, R. "Review: DSDM: Dynamic Systems Development Method." Computer Bulletin 39, no. 6 (December 1, 1997): 31. http://dx.doi.org/10.1093/combul/39.6.31-b.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Purnia, Dini Silvi, and Devi Fauziah Nur. "Implementasi Metode DSDM Pada SIPELAKOR." Indonesian Journal on Software Engineering (IJSE) 4, no. 2 (July 23, 2019): 6–13. http://dx.doi.org/10.31294/ijse.v4i2.5973.

Full text

Abstract:

Abstract - Posyandu is a unit of the Ministry of Health implemented a working area in shade local health centers. The Ministry of health integrated program is usually done each month. In service there are a number of issues including Posyandu officer posyandu do record keeping and reporting in the form of a paper record-keeping or paperbase. This is a very slow process of work of the officers of the posyandu and not efisien Posyandu services process and often the parents who come to the Posyandu by not bringing KMS made the parents do not have a handle to monitor Toddler development so that in this study enulis information systems Design Services make Posyandu as Monitoring Developments for parents (SIPELAKOR) as one of the solutions of the problems of the existing system running at Posyandu to help simplify the entire process of service development and monitoring of Posyandu Toddlers using Dynamic System Development Method (DSDM) as a method of development lnak and the Unified Modelling Language (UML) as an Object-based visual modeling tools for designing this Posyandu services system. Keywords : Dynamic Systems Development Method (DSDM),Posyandu, information systems, and the Unified Modeling Language (UML)

APA, Harvard, Vancouver, ISO, and other styles

3

Hariman, Irman, and Christina Meilisa. "SISTEM INFORMASI MANAJEMEN TRAINING MENGGUNAKAN METODE AGILE SOFTWARE DEVELOPMENT THE PAPANDAYAN HOTEL BANDUNG." ENSAINS JOURNAL 3, no. 1 (January 13, 2020): 60. http://dx.doi.org/10.31848/ensains.v3i1.371.

Full text

Abstract:

Abstract: Training / Training is one of the human resource development programs aimed at achieving competent and quality performance. Management Information System which is the application of information systems within the organization to gather some information needed by all levels of management and those who will need information. Training needs assessment is very important because it provides information about the level of expertise and knowledge of the organization's human resources. With this information, managers can find out the organization's needs and employee capabilities. One method used in this research is Agile Software Development, a type of short-term system development that requires rapid adaptation and development of changes in any form. Using the Dynamic System Development Method (DSDM) process model which is a rapid software development approach that "provides a framework for building and maintaining systems / software that meet tight time limits through the use of prototypes that are slowly added and expanded (Incremental) Prototyping) in a controlled project environment ".Keywords: Employee Training, Agile Software Development, Dynamic Systems Method (DSDMAbstrak: Pelatihan/Training merupakan salah satu program pengembangan sumber daya manusia yang bertujuan dalam mencapai kinerja yang kompeten dan berkualitas. Sistem Informasi Manajemen yang merupakan penerapan sistem informasi di dalam organisasi untuk mengumpulkan beberapa informasi yang di butuhkan oleh semua tingkatan manajemen dan pihak-pihak yang akan memerlukan informasi. Penilaian kebutuhan training sangat penting karena menyediakan informasi mengenai tingkat keahlian (skill) dan pengetahuan (knowledge) sumber daya manusia organisasi. Dengan informasi ini, manajer dapat mengetahui kebutuhan organisasi dan kapabilitas karyawan. Salah satu metode yang digunakan dalam penelitian ini adalah Agile Software Development, merupakan jenis pengembangan sistem jangka pendek yang memerlukan adaptasi cepat dan pengembangan terhadap perubahan dalam bentuk apapun. Menggunakan model proses Dynamic System Development Method (DSDM) yang merupakan sebuah pendekatan pengembangan perangkat lunak cepat yang “menyediakan kerangka kerja untuk membangun dan memelihara sistem/perangkat lunak yang memenuhi batasan waktu yang ketat melalui penggunaan prototype yang secara perlahan di tambahi dan di perluas (Incremental Prototyping) dalam lingkungan proyek terkendali”Kata Kunci : Training Karyawan, Agile Software Development, Dynamic Systems Method (DSDM

APA, Harvard, Vancouver, ISO, and other styles

4

Sama, Hendi. "School Operational Effectiveness Analysis Web Based Event System with Dynamic Systems Development." JOURNAL OF INFORMATICS AND TELECOMMUNICATION ENGINEERING 3, no. 1 (July 25, 2019): 76. http://dx.doi.org/10.31289/jite.v3i1.2602.

Full text

Abstract:

<span>School institutions in Batam have problems in how the events they conduct can support the school's operational effectiveness. The solution model for these problems is to build web-based event systems using the dynamic systems development (DSDM) method. This system aims to solve problems that occur in event scheduling at activities carried out at school institutions in Batam. The school representative used is a school in Batam. The method is done by learning and the feasibility of case studies, model functionality, design, and implementation. This implementation produces a system that is very helpful in processing data and reports during the event. Starting from the registration of the event, the continuity of the event, until the completion of the event, all can be stored in detail. Besides users, there are also managers and administrators. Managers have a role to manage the data entered by registrants, while administrators give access to each user account and maintain system security. This system is divided into 2 roles with one as a user and one acting as an administrator. Registrants to participate in this event act as users. The results of this study are that school operational effectiveness increases after implementing this web-based event system.</span>

APA, Harvard, Vancouver, ISO, and other styles

5

Akbar, Rizaldi, and Rahmi Hajriyanti. "Sebuah Kerangka Kerja untuk mengembangkan e-Tracer study berbasis Sistem Cerdas." Jurnal JTIK (Jurnal Teknologi Informasi dan Komunikasi) 4, no. 2 (May 29, 2020): 82. http://dx.doi.org/10.35870/jtik.v4i2.135.

Full text

Abstract:

Tracer studies are a method used by tertiary institutions to track, monitor, and supervise graduates that have been produced by tertiary institutions. These activities can make a performance measurement related to the implementation of education so far. Currently, the tracer study has been developed to become a system that can provide decisions and measure graduates using an intelligent agent (AI). In this study, the authors used a descriptive research method, namely developing an information system based on existing data and developed using PHP software, and the Dynamic System Development Method (DSDM) is a system development method. Researchers have implemented an AI integration framework in a web-based tracer study architecture. System evaluation is used as the next research iteration of the proposed decision support system, this study also aims to monitor graduates. With the existence of an intelligent system-based e-tracer study, it has become an evolution in studying artificial intelligence to support monitoring and as a tool in increasing graduates in Higher Education.Keywords:Systems Framework, Tracer study, Intelligent Systems, Web

APA, Harvard, Vancouver, ISO, and other styles

6

Dewi Ayu Nur Wulandari, Muhammad Dika Atthariq, Wahyu Dwi Nanda, and Lestari Yusuf. "IMPLEMENTASI DYNAMIC SYSTEM DEVELOPMENT METHOD (DSDM) PADA SISTEM INFORMASI MANAJEMEN BENGKEL MOBIL BERBASIS WEB." JSiI (Jurnal Sistem Informasi) 8, no. 1 (March 11, 2021): 10–17. http://dx.doi.org/10.30656/jsii.v8i1.2979.

Full text

Abstract:

Abstrak - Dalam mengembangkan dan membangun sebuah perangkat lunak kita dapat menggunakan metode Dynamic System Development Method (DSDM). DSDM merupakan metode pemngembangan perangkat lunak dimana aplikasi yang dibangun berdasarkan kebutuhan dan komunikasi antara pengguna dan pengembang. Tujuan dari penelitian ini adalah membuat aplikasi Sistem Informasi Manajemen Bengkel pada Bengkel DK Variasi dengan tujuan untuk meminimalkan kesalahan yang mungkin terjadi pada saat pengadaan stok barang yang meliputi pembelian spare part, penerimaan spare part, retur dan penerimaan retur. Proses pembuatan aplikasi ini menggunakan tahapan-tahapan yang ada pada DSDM yang dimulai dari menganalisa sistem kerja dan prosedur yang digunakan saat ini pada Bengkel DK Variasi. Kemudian dari hasil analisa tersebut, dilanjutkan dengan mendesain business sytem dengan menggunakan UML. Selanjutnya pembuatan desain database yang terdiri dari 8 entitas, yang kemudian di-generate ke aplikasi basis data untuk membuat database yang nantinya akan digunakan dalam menyimpan data serta desain input dan output. Tahap terakhir yaitu mengimplementasikan program yang telah disusun dan database yang telah dirancang keprogram berbasis web kemudian dilanjutkan dengan proses pengujian sistem terhadap fitur-fitur pada proses pembelian spare part, penerimaan spare part, retur dan penerimaan retur dengan menggunakan blackbox testing sebelum akhirnya di implementasikan. Implementasi dari aplikasi ini dapat memudahkan pengguna dalam menjalankan proses bisnis yang berjalan pada bengkel DK Variasi khususnya dalam mengelola data sparepart, mengelola data barang masuk dan data barang keluar, pencatatan data transaksi service dan pengelolaan laporan data sparepart, laporan transaksi, laporan barang masuk dan barang keluar. Dengan diimplementasikannya aplikasi ini, maka proses pencatatan yang sebelumnya masih dilakukan secara manual sudah tergantikan dengan sistem yang terkomputerisasi sehingga semua transaksi dapat terdokumentasi dengan baik. Kata kunci : Sistem, Sistem Informasi, Dynamic System Development Metthod, DSDM, Agile

APA, Harvard, Vancouver, ISO, and other styles

7

Sani, Abdullahi, Adila Firdaus, Seung Ryul Jeong, and Imran Ghani. "A Review on Software Development Security Engineering using Dynamic System Method (DSDM)." International Journal of Computer Applications 69, no. 25 (May 17, 2013): 33–44. http://dx.doi.org/10.5120/12131-8527.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Laksmana, Ganesha Nur, Prianggada Indra Tanaya, and Yuki Indrayadi. "BENCHMARKING AND CONFIGURATION OF OPENSOURCE MANUFACTURING EXECUTION SYSTEM (MES) APPLICATION." CommIT (Communication and Information Technology) Journal 7, no. 1 (May 31, 2013): 1. http://dx.doi.org/10.21512/commit.v7i1.575.

Full text

Abstract:

Information now is an important element to every growing industry in the world. Inorder to keep up with other competitors, endless improvements in optimizing overall efficiency areneeded. There still exist barriers that separate departments in PT. XYZ and cause limitation to theinformation sharing in the system. Open-Source Manufacturing Execution System (MES) presentsas an IT-based application that offers wide variety of customization to eliminate stovepipes bysharing information between departments. Benchmarking is used to choose the best Open-SourceMES Application; and Dynamic System Development Method (DSDM) is adopted as this workguideline. As a result, recommendations of the chosen Open-Source MES Application arerepresented.Keywords: Manufacturing Execution System (MES); Open Source; Dynamic SystemDevelopment Method (DSDM); Benchmarking; Configuration

APA, Harvard, Vancouver, ISO, and other styles

9

Octavia, Tanty. "INTEGRATION OF DATABASE INTO BUSINESS PROCESS TO SUPPORT IMPLEMENTATION OF CUSTOMER RELATIONSHIP MANAGEMENT: CASE STUDY IN PT TDI." CommIT (Communication and Information Technology) Journal 7, no. 1 (May 31, 2013): 7. http://dx.doi.org/10.21512/commit.v7i1.577.

Full text

Abstract:

Information now is an important element to every growing industry in the world. Inorder to keep up with other competitors, endless improvements in optimizing overall efficiency areneeded. There still exist barriers that separate departments in PT. XYZ and cause limitation to theinformation sharing in the system. Open-Source Manufacturing Execution System (MES) presentsas an IT-based application that offers wide variety of customization to eliminate stovepipes bysharing information between departments. Benchmarking is used to choose the best Open-SourceMES Application; and Dynamic System Development Method (DSDM) is adopted as this workguideline. As a result, recommendations of the chosen Open-Source MES Application arerepresented.

APA, Harvard, Vancouver, ISO, and other styles

10

Lewis, Marcn D., Alex V. Lamey, and Lori Douglas. "A new dynamic systems method for the analysis of early socioemotional development." Developmental Science 2, no. 4 (November 1999): 457–75. http://dx.doi.org/10.1111/1467-7687.00090.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Tretyakova, E. A. "Assessing sustainability of development of ecological and economic systems: A dynamic method." Studies on Russian Economic Development 25, no. 4 (July 2014): 423–30. http://dx.doi.org/10.1134/s1075700714040133.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Howard, Alan. "A new RAD‐based approach to commercial information systems development: the dynamic system development method." Industrial Management & Data Systems 97, no. 5 (August 1997): 175–77. http://dx.doi.org/10.1108/02635579710785456.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Shin, Seung-Ki, and Poong-Hyun Seong. "REVIEW OF VARIOUS DYNAMIC MODELING METHODS AND DEVELOPMENT OF AN INTUITIVE MODELING METHOD FOR DYNAMIC SYSTEMS." Nuclear Engineering and Technology 40, no. 5 (August 31, 2008): 375–86. http://dx.doi.org/10.5516/net.2008.40.5.375.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Rusdiana, Lili. "Dynamic Systems Development Method dalam membangun Aplikasi Data Kependudukan Pada Kelurahan Rantau Pulut." Jurnal Transformatika 16, no. 1 (August 10, 2018): 84. http://dx.doi.org/10.26623/transformatika.v16i1.859.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Liu, T. S., and J. C. Lin. "Forced Vibration of Flexible Body Systems: A Dynamic Stiffness Method." Journal of Vibration and Acoustics 115, no. 4 (October 1, 1993): 468–76. http://dx.doi.org/10.1115/1.2930374.

Full text

Abstract:

Due to the development of high speed machinery, robots, and aerospace structures, the research of flexible body systems undergoing both gross motion and elastic deformation has seen increasing importance. The finite element method and modal analysis are often used in formulating equations of motion for dynamic analysis of the systems which entail time domain, forced vibration analysis. This study develops a new method based on dynamic stiffness to investigate forced vibration of flexible body systems. In contrast to the conventional finite element method, shape functions and stiffness matrices used in this study are derived from equations of motion for continuum beams. Hence, the resulting shape functions are named as dynamic shape functions. By applying the dynamic shape functions, the mass and stiffness matrices of a beam element are derived. The virtual work principle is employed to formulate equations of motion. Not only the coupling of gross motion and elastic deformation, but also the stiffening effect of axial forces is taken into account. Simulation results of a cantilever beam, a rotating beam, and a slider crank mechanism are compared with the literature to verify the proposed method.

APA, Harvard, Vancouver, ISO, and other styles

16

Omorov, R. O. "Robust of Interval Dynamic Systems." Mekhatronika, Avtomatizatsiya, Upravlenie 20, no. 6 (June 6, 2019): 333–40. http://dx.doi.org/10.17587/mau.20.333-340.

Full text

Abstract:

The frequency and algebraic directions of researches of robust stability are considered. Frequency or Tsypkin-Polyaka’s direction is considered briefly in a survey order. The algebraic or Kharitonov’s direction is considered more more widely, namely basic provisions and results of the Algebraic method of robust stability of interval dynamic systems developed within development algebraic or Kharitonov’s direction of robust stability are presented. Fundamental works of V. L. Kharitonov since issue have caused a huge flow of the publications connected with extreme relevance of the solution of problems of a robustness of systems. So far from a circle of problems of a robustness many issues of robust stability are resolved. Discrete analogs and versions of theorems of Kharitonov are received. Frequency conditions of robust stability are considered and solved in Ya. Z. Tsypkin, B. T. Polyak, Yu. I. Neymark works. However in a problem of robust stability not all issues are so far resolved, especially big contradictions have arisen in a continuous case. Also the tasks considered here for interval matrixes and polyhedrons of matrixes haven’t been solved. In work the theorem like the third theorem of Kharitonov which cancels counterexamples to former known results in this direction is formulated and proved and also on its basis the costal theorem for polyhedrons of matrixes is proved. The new costal theorem also cancels counterexamples for this case. To the main theorem of the considered algebraic method the specifying remark is formulated that in the absence of a full set of four angular polynoms of Kharitonov of a condition of this theorem are necessary, but can be insufficient for stability of system. Determination of angular separate coefficients of a characteristic polynom of system is generally carried out by means of use of methods of nonlinear programming. For a discrete case the discrete analog of the theorem of Kharitonov which is received on the basis of Schur’s theorem is presented. At the same time, the concepts of points and intervals of a variabless used for the theorem of an analog of a continuous case are entered. The algorithm of definition of a robustness of discrete systems is formulated. The main results, the Algebraic method of robust stability developed by the author are illustrated with cancellation of the counterexamples widely known from scientific literature.

APA, Harvard, Vancouver, ISO, and other styles

17

Cao, Bin, Chenyu Hou, Liwei Zhao, Louai Alarabi, Jing Fan, Mohamed F. Mokbel, and Anas Basalamah. "SHAREK*: A Scalable Matching Method for Dynamic Ride Sharing." GeoInformatica 24, no. 4 (June 2, 2020): 881–913. http://dx.doi.org/10.1007/s10707-020-00411-0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Tran, Chau M., and Steve C. Southward. "A Virtual Sensing Method for Tonal ANVC Systems." Journal of Dynamic Systems, Measurement, and Control 124, no. 1 (June 26, 2001): 35–40. http://dx.doi.org/10.1115/1.1435642.

Full text

Abstract:

Virtual Sensing (VS) is considered to be an extension for feedforward Active Noise and Vibration Control (ANVC) systems when, for example, it is desired to minimize the response at one or more spatial locations where it is either physically impossible or undesirable to place an actual error sensor. In this context, VS is an estimation technique for predicting the appropriate system response using available measurements and a dynamic system model. A hybrid adaptive feedforward observer is proposed which has the ability to overcome the limitations of conventional dynamic observer designs. The hybrid observer utilizes a conventional dynamic observer augmented with an adaptive feedforward element for estimating the effect of the persistent disturbance. For simplicity, we restrict this development to a single tonal disturbance for which a coherent reference is assumed available. It will be appreciated that this technique may be extended to handle disturbances that contain multiple tones as well as broadband noise, as long as suitable reference signals are available. Numerical simulations and real-time experiments were performed on a one-dimensional acoustic duct. The results demonstrate that the hybrid adaptive feedforward observer is an effective method for predicting the virtual sensor response in an ANVC system.

APA, Harvard, Vancouver, ISO, and other styles

19

Ferris, J. B., J. L. Stein, and M. M. Bernitsas. "Development of Proper Models of Hybrid Systems." Journal of Dynamic Systems, Measurement, and Control 120, no. 3 (September 1, 1998): 328–33. http://dx.doi.org/10.1115/1.2805405.

Full text

Abstract:

A method to improve the ability of design engineers to generate proper dynamic models of systems from sets of component models is developed. This two stage method, called Eigenvalue MODA, is a new model deduction procedure for developing proper models of hybrid systems. The first stage in Eigenvalue MODA consists of using a previously published Model Order Deduction Algorithm (MODA) to systematically increment the complexity of each component model in the system. The first stage continues until a set of Critical System Eigenvalues (CSE) has been defined. During the second stage, the complexity component models is incremented based on the convergence of the CSE. The second stage continues until each CSE has converged to within a user specified tolerance. Component models may be represented by first-order (state space) or second-order equations and may be modal expansion or finite segment models. An example shows that the deduction of the proper system model depends on the interactions between the component model representations and the model deduction method. Eigenvalue MODA is a model deduction method that facilitates the generation of models of sufficient accuracy with physically meaningful parameters and states. This makes the models useful for system design and, as such, Eigenvalue MODA would be a useful tool in an automated modeling environment for design engineers.

APA, Harvard, Vancouver, ISO, and other styles

20

Yang, Junqi, Zhenfei Zhan, Chong Chen, Yajing Shu, Ling Zheng, Ren-Jye Yang, Yan Fu, and Saeed Barbat. "Development of a Comprehensive Validation Method for Dynamic Systems and Its Application on Vehicle Design." SAE International Journal of Materials and Manufacturing 8, no. 3 (April 14, 2015): 646–52. http://dx.doi.org/10.4271/2015-01-0452.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Lutsenko, Igor. "Development of structure and method of effective binary stabilization of quality parameter in dynamic systems." Eastern-European Journal of Enterprise Technologies 3, no. 4 (93) (May 16, 2018): 44–52. http://dx.doi.org/10.15587/1729-4061.2018.131296.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Liao, Li Jun, Shu Hua Mao, and Ming Yun Gao. "Grey Discrete Time Systems for Biological Population Dynamic Analysis." Applied Mechanics and Materials 343 (July 2013): 127–34. http://dx.doi.org/10.4028/www.scientific.net/amm.343.127.

Full text

Abstract:

This paper forecasts the development trend of wildlife population based on grey dynamic discrete systems, and discusses the estimation method of spectral radius for the 3-order grey transfer state matrices. Taking the population variation of the spotted owls for example, it analyzes the causes for increase or decrease in population and calculates the threshold between these two states, which will contribute to protecting species diversity. The paper is the expansion of application field of the grey system, and the method is simple and easy to be realized.

APA, Harvard, Vancouver, ISO, and other styles

23

Strbo, Milan, Pavol Tanuska, Augustin Gese, and Marek Korytar. "Model-Oriented Safety Analysis of Dynamic Technological Systems." Applied Mechanics and Materials 474 (January 2014): 127–34. http://dx.doi.org/10.4028/www.scientific.net/amm.474.127.

Full text

Abstract:

The paper deals with the safety analysis for dynamic technological systems. The analysis is performed in the phase of control system development. The SQMD method has been proposed to use for safety analysis of dynamical systems. We created models for safety-critical states of system using this method. The models are divided to qualitative and quantitative. Qualitative models are created by using of fuzzy logic. There we will use the knowledge and experience of safety analysis of similar systems. Quantitative models are constructed by using of differential and difference equations. Mathematical models are verified by simulation. Hybrid models for individual safety-critical states are constructed by synthesis of qualitative and quantitative models. Finally is performed on-line monitoring and fault detection in real system by using these hybrid models.

APA, Harvard, Vancouver, ISO, and other styles

24

Chahande, A. I., and J. S. Arora. "Development of a multiplier method for dynamic response optimization problems." Structural Optimization 6, no. 2 (June 1993): 69–78. http://dx.doi.org/10.1007/bf01743338.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Hurley, Emma, and Raegan Murphy. "The development of a new method of idiographic measurement for dynamic assessment intervention." Journal of Pedagogy 6, no. 1 (June 1, 2015): 43–60. http://dx.doi.org/10.1515/jped-2015-0003.

Full text

Abstract:

Abstract This paper proposes a new method of idiographic measurement for dynamic assessment (DA) intervention. There are two main methods of measurement for DA intervention; split -half tests and integrated scoring systems. Split-half tests of ability have proved useful from a research perspective. Integrated scoring systems coupled with case studies are useful from a practitioner perspective. The purpose of this research is to bridge the gap between research and practice by developing a methodology that is compatible with both. To this end the paper proposes a measureable idiographic method of measurement, which utilises multi-dimensional scaling (MDS) and general procrustean analysis (GPA) to analyse the result of card-sort data gathered from a learner across the entire intervention. This approach provides a method of assessment, which is both compatible with individual intervention and suited to building a body of evidence-based research for DA. An example of the method in practice is given for illustrative purposes. The initial results suggest that this approach provides a methodology that satisfies the requirements of both practitioners when formulating targeted intervention and researchers who require methods of measurement of change in ability of the individual over time.

APA, Harvard, Vancouver, ISO, and other styles

26

Kalinski, Krzysztof, Marek Galewski, and Michał Mazur. "A Surveillance Of Dynamic Processes on Selected Mechatronic Systems." Archive of Mechanical Engineering 60, no. 3 (September 1, 2013): 347–67. http://dx.doi.org/10.2478/meceng-2013-0023.

Full text

Abstract:

Abstract The paper concerns development of original method of optimal control at energy performance index and its application to dynamic processes surveillance of some mechatronic systems. The latter concerns chatter vibration surveillance during highspeed slender milling of rigid details, as well as motion control of two-wheeled mobile platform. Results of on-line computer simulations and real performance on the target objects reflect a great efficiency of the processes surveillance

APA, Harvard, Vancouver, ISO, and other styles

27

Cianetti, Filippo, Luca Fabellini, Valerio Formica, and Francesco Ambrogi. "Development and validation of a simplified automotive steering dynamic model." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 235, no. 8 (January 9, 2021): 2188–99. http://dx.doi.org/10.1177/0954407020984668.

Full text

Abstract:

This paper describes an innovative analytic/numerical method for modeling steering systems for automotive applications. Starting from a detailed literature analysis and pushed by vehicle manufacturers’ needs, a simplified steering dynamic model, characterized by few parameters, has been identified. It guarantees both the replication of the dynamic behavior of real systems, generally represented through more complex multibody models, and the reduction of the simulation time of the entire vehicle system, making it suitable for dedicated numerical computing environments, such as the, so-called, explicit multibody codes. Moreover, particular emphasis has been place on the correct evaluation of the influence of friction on steering system dynamics.

APA, Harvard, Vancouver, ISO, and other styles

28

K.T., Vinod, S. Prabagaran, and O. A. Joseph. "Dynamic due date assignment method." Journal of Manufacturing Technology Management 30, no. 6 (October 21, 2019): 987–1003. http://dx.doi.org/10.1108/jmtm-06-2017-0112.

Full text

Abstract:

Purpose The purpose of this paper is to determine the interaction between dynamic due date assignment methods and scheduling decision rules in a typical dynamic job shop production system in which setup times are sequence dependent. Two due date assignment methods and six scheduling rules are considered for detailed investigation. The scheduling rules include two new rules which are modifications of the existing rules. The performance of the job shop system is evaluated using various measures related to flow time and tardiness. Design/methodology/approach A discrete-event simulation model is developed to describe the operation of the job shop. The simulation results are subjected to statistical analysis based on the method of analysis of variance. Regression-based analytical models have been developed using the simulation results. Since the due date assignment methods and the scheduling rules are qualitative in nature, they are modeled using dummy variables. The validation of the regression models involves comparing the predictions of the performance measures of the system with the results obtained through simulation. Findings The proposed scheduling rules provide better performance for the mean tardiness measure under both the due date assignment methods. The regression models yield a good prediction of the performance of the job shop. Research limitations/implications Other methods of due date assignment can also be considered. There is a need for further research to investigate the performance of due date assignment methods and scheduling rules for the experimental conditions that involve system disruptions, namely, breakdowns of machines. Practical implications The explicit consideration of sequence-dependent setup time (SDST) certainly enhances the performance of the system. With appropriate combination of due date assignment methods and scheduling rules, better performance of the system can be obtained under different shop floor conditions characterized by setup time and arrival rate of jobs. With reductions in mean flow time and mean tardiness, customers are benefitted in terms of timely delivery promises, thus leading to improved service level of the firm. Reductions in manufacturing lead time can generate numerous other benefits, including lower inventory levels, improved quality, lower costs, and lesser forecasting error. Originality/value Two modified scheduling rules for scheduling a dynamic job shop with SDST are proposed. The analysis of the dynamic due date assignment methods in a dynamic job shop with SDST is a significant contribution of the present study. The development of regression-based analytical models for a dynamic job shop operating in an SDST environment is a novelty of the present study.

APA, Harvard, Vancouver, ISO, and other styles

29

Vasilyev, G. S., O. R. Kuzichkin, I. A. Kurilov, and D. I. Surzhik. "Development of methods to model UAVS nonlinear automatic control systems." Revista de la Universidad del Zulia 11, no. 30 (July 2, 2020): 137–47. http://dx.doi.org/10.46925//rdluz.30.10.

Full text

Abstract:

When modeling Automatic Control Systems (ACS) of an unmanned aerial vehicle (UAV), it is often necessary to take into account the nonlinearity of an aircraft's reaction when the controls drift, as well as the strong influence of various destabilizing factors that make the system go out of linear mode. When known analytical and numerical methods are used to analyze dynamic systems, it is problematic to obtain general solutions that are valid for the variable parameters of the system under study and, at the same time, provide the required error value. A method has been developed to model dynamic processes in automatic non-linear UAV control systems based on linear approximation by parts and crosslinking of partial solutions with consideration of the initial conditions. An example of using the technique to model the transition characteristics of an ACS UAV with a single non-linear link is considered. Based on the analysis of errors in the calculation of the transition process, the effectiveness of the proposed approach is shown.

APA, Harvard, Vancouver, ISO, and other styles

30

Gai, Wen Xuan. "Research on Application of Tunable Dispersion Compensation Technology in Optical Fiber Communication Systems." Applied Mechanics and Materials 401-403 (September 2013): 1956–59. http://dx.doi.org/10.4028/www.scientific.net/amm.401-403.1956.

Full text

Abstract:

For high bit-rate optical communications system, the changes in temperature or power fluctuations are due to the dispersion of the dispersion tolerance than the system. Therefore, the dispersion compensation unit must have the functionality to adapt to the dynamic generation of tunable optical communication network development. This article describes several dynamic tunable compensation techniques and the basic principles of the performance characteristics of the situation at home and abroad, including the chirped fiber grating method, the virtual image phased array method, GT interferometer method, the array method and the planar waveguide grating method, and a brief discussion of tunable dispersion compensation technology in the future direction of development.

APA, Harvard, Vancouver, ISO, and other styles

31

Erokhin, V. V. "SYNTHESIS OF MANAGEMENT DECISIONS IN DYNAMIC ORGANIZATIONAL SYSTEMS." Juvenis scientia, no. 12 (2018): 7–10. http://dx.doi.org/10.32415/jscientia.2018.12.02.

Full text

Abstract:

The article develops a model for adapting the synthesis of solutions in an organizational system based on the use of a functionally redundant set of actions. Presents the development of new adapted algorithms and models to the conditions of decision-making in the presence of external requirements. The optimization problem of choosing a solution synthesis option is considered, which is solved through the implementation of three stages - synthesis, evaluation and selection. The proposed method for analyzing management decisions in organizational systems allows one to take into account the variability of input factors, which makes it possible to more reliably find the optimal management solution. For the analysis of management organizational systems, a methodology has been developed for calculating the sensitivity of indicators of management decisions to changes in various output parameters of the system. A comparative analysis of the options indicators of management decisions of the organizational system is recommended through sensitivity analysis.

APA, Harvard, Vancouver, ISO, and other styles

32

Uspenskyi, Valerii, Ivan Bagmut, and Mariia Nekrasova. "Development of method and algorithm of dynamic gyrocompassing for highspeed systems of navigation and control of movement." Eastern-European Journal of Enterprise Technologies 1, no. 9 (91) (February 22, 2018): 72–29. http://dx.doi.org/10.15587/1729-4061.2018.119735.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Sheth, P. N., T. M. Hodges, and J. J. Uicker. "Matrix Analysis Method for Direct and Multiple Contact Multibody Systems." Journal of Mechanical Design 112, no. 2 (June 1, 1990): 145–52. http://dx.doi.org/10.1115/1.2912586.

Full text

Abstract:

A generalized modeling procedure for curves and surfaces in direct contact relative motions is developed, such that these joints can be consistently included in the well-developed and established (4 × 4) matrix method for kinematic, static, and dynamic analyses of geometrically constrained lower paired multibody mechanical systems. The modeling procedure allows both the analytical and the discretized Geometric Modeling approaches. As one application of these analytical techniques, a numerical procedure for mobility analysis of multiple contact joints is presented and illustrated. Other applications of this development are enumerated.

APA, Harvard, Vancouver, ISO, and other styles

34

Dattner, Itai, Harold Ship, and Eberhard O. Voit. "Separable Nonlinear Least-Squares Parameter Estimation for Complex Dynamic Systems." Complexity 2020 (April 2, 2020): 1–11. http://dx.doi.org/10.1155/2020/6403641.

Full text

Abstract:

Nonlinear dynamic models are widely used for characterizing processes that govern complex biological pathway systems. Over the past decade, validation and further development of these models became possible due to data collected via high-throughput experiments using methods from molecular biology. While these data are very beneficial, they are typically incomplete and noisy, which renders the inference of parameter values for complex dynamic models challenging. Fortunately, many biological systems have embedded linear mathematical features, which may be exploited, thereby improving fits and leading to better convergence of optimization algorithms. In this paper, we explore options of inference for dynamic models using a novel method of separable nonlinear least-squares optimization and compare its performance to the traditional nonlinear least-squares method. The numerical results from extensive simulations suggest that the proposed approach is at least as accurate as the traditional nonlinear least-squares, but usually superior, while also enjoying a substantial reduction in computational time.

APA, Harvard, Vancouver, ISO, and other styles

35

Wei, June, Binshan Lin, and Meiga Loho-Noya. "Development of an E-Healthcare Information Security Risk Assessment Method." Journal of Database Management 24, no. 1 (January 2013): 36–57. http://dx.doi.org/10.4018/jdm.2013010103.

Full text

Abstract:

This paper developed a method to assess information security risks in e-healthcare. Specifically, it first developed a static E-Healthcare Information Security Risk (EHISR) model to present thirty-three security risk factors by identifying information security threats and their sources in e-healthcare. Second, a dynamic E-Healthcare Information Flow (EHIF) model was developed to logically link these information risk factors in the EHISR model. Pattern analysis showed that information security risks could be classified into two levels, and versatility analysis showed that the overall security risks for eight information flows were close with a range from 55% to 86%. Third, one quantifiable approach based on a relative-weighted assessment model was developed to demonstrate how to assess the information security risks in e-healthcare. This quantitative security risk measurement establishes a reference point for assessing e-healthcare security risks and assists managers in selecting a reliable information flow infrastructure with a lower security risk level.

APA, Harvard, Vancouver, ISO, and other styles

36

Vasilyev, G. S., O. R. Kuzichkin, I. A. Kurilov, and D. I. Surzhik. "Development of a methodology to model the dynamic properties of UAVS and high-order control systems." Revista de la Universidad del Zulia 11, no. 30 (July 2, 2020): 189–99. http://dx.doi.org/10.46925//rdluz.30.14.

Full text

Abstract:

When modeling the dynamic properties of an unmanned aerial vehicle (UAV) and an automatic control system (ACS), it is often necessary to take into account factors such as the lack of rigidity of the aircraft structure, the influence of control and destabilizing factors, which leads to an increase in the order of the model under study. The known numerical and analytical methods do not allow us to obtain general solutions for the variable parameters of the high-order system under study, and at the same time provide the required amount of error and computational costs. A method is developed to model the dynamic properties of UAVs and high-order control systems based on the spectral method, the linear approximation by parts of the input control actions and the spectrum of the system's output signal. An example of using the technique to model the dynamic properties of different orders ACS UAVs (from 1 to 10) with different types of inertia is considered. Based on the analysis of errors in the calculation of the transition process, the effectiveness of the method for analyzing high-order systems is shown based on the required computational costs.

APA, Harvard, Vancouver, ISO, and other styles

37

Ahmadinia, Ali. "Efficient Dynamic Memory Management for Multiprocessor Cyber-Physical Systems." International Journal of Cyber-Physical Systems 1, no. 1 (January 2019): 35–44. http://dx.doi.org/10.4018/ijcps.2019010103.

Full text

Abstract:

Dynamic data management for multiprocessor systems in the absence of an operating system (OS) is a challenging area of research. OSs are typically used to abstract developers from the process of managing dynamic data at runtime. However, due to the many different types of multiprocessor available, an OS is not always available, making the management of dynamic data a difficult task. In this article, we present a hardware and software co-design methodology for the management of dynamic data in multiprocessor system on chips (MPSoC) development environments without an OS. We compare and contrast the method of sharing dynamic data between cores with standard methods and also to static data management methods and find that the proposed methodology can improve the performance of dynamic memory operations by up to 72.94% with negligible power and resource consumption.

APA, Harvard, Vancouver, ISO, and other styles

38

Hollenstein, Tom. "State space grids: Analyzing dynamics across development." International Journal of Behavioral Development 31, no. 4 (July 2007): 384–96. http://dx.doi.org/10.1177/0165025407077765.

Full text

Abstract:

Developmentalists are generally interested in systems perspectives and this is reflected in the theoretical models of the past decade. However, the methodological tools to test these models are either nonexistent or difficult for many researchers to use. This article reviews the state space grid (SSG) method for analyzing synchronized event sequences based on dynamic systems (DS) principles. Following a review of these DS concepts and the basics of the SSG method, several studies are reviewed. Greater emphasis and detail are provided for three longitudinal studies that relate real-time socioemotional dynamics to processes of developmental change and stability. The concluding sections provide guidelines for researchers interested in using the SSG method and some suggestions for future SSG studies.

APA, Harvard, Vancouver, ISO, and other styles

39

Li, Wenrui, Menggang Li, Yiduo Mei, Ting Li, and Fang Wang. "A Big Data Analytics Approach for Dynamic Feedback Warning for Complex Systems." Complexity 2020 (October 5, 2020): 1–9. http://dx.doi.org/10.1155/2020/7652496.

Full text

Abstract:

With the development of science and technology, the application of big data is becoming more and more widespread, and it has gradually expanded to various fields such as economy and commerce. Since the 2008 international financial crisis, the mainstream economics has shown deficiencies to a certain extent. On the one hand, the expressions pursued by mainstream economic theories are too strict, restricting its processing capabilities. On the other hand, the linearization method ignores the diversity, complexity, and variability of changes in the economic system, which may ignore the emergence of some serious crises. Due to the increasing distance between theoretical models and practice, theoretical models cannot guide the practice and sometimes even mislead the latter. In this paper, we propose a method of dynamic feedback early warning based on big data, which uses the LPPL model to fit parameters. Finally, we used this method to analyze the case of the A-share disaster. The research results show that the method makes the early warning coefficients of dynamic and complex systems more scientific and accurate.

APA, Harvard, Vancouver, ISO, and other styles

40

Hulsbeek, J. J. W., J. Kruit, P. J. Roeleveld, and M. C. M. van Loosdrecht. "A practical protocol for dynamic modelling of activated sludge systems." Water Science and Technology 45, no. 6 (March 1, 2002): 127–36. http://dx.doi.org/10.2166/wst.2002.0100.

Full text

Abstract:

Use of dynamic simulation models has become standard practice in The Netherlands. Since the introduction around 5 years ago more then 100 full scale wastewater treatment plants have been modelled. Initially very different approaches have been used varying in calibration approach, amount of sampling and time investment. Based on the accumulated practical experiences the Dutch Foundation of Applied Water Research STOWA has stimulated the development of a protocol to aid in the set-up and calibration of models for full scale wastewater treatment plants. Herein the aim was to develop a protocol, which in practice was easy to use, minimising time and costs effort, but give a reliable and useable method. In this paper this protocol is briefly described.

APA, Harvard, Vancouver, ISO, and other styles

41

Tamas, Peter. "APPLICATION POSSIBILITIES OF DYNAMIC VALUE STREAM MAPPING IN PRODUCTION LOGISTICS." Journal of Production Engineering 24, no. 1 (June 30, 2021): 55–58. http://dx.doi.org/10.24867/jpe-2021-01-055.

Full text

Abstract:

An increase in the number of product types required by customers results in an increase in the complexity of logistics systems. This finding is particularly characteristic of production logistics systems, where the use of flexible production systems is becoming increasingly important. One of the defining tools for the development of these processes is the value process mapping method, a static version of which suitable for the simultaneous examination of a product family has become widespread in corporate practice. The paper presents the method of dynamic value stream mapping, which is also suitable for the examination of complex logistics systems, exploring its steps and the possibilities of its application in production logistics. An example prepared using the VSM module of the Plant Simulation framework is also presented to illustrate the application of the method.

APA, Harvard, Vancouver, ISO, and other styles

42

Morini, M., M. Pinelli, and M. Venturini. "Development of a One-Dimensional Modular Dynamic Model for the Simulation of Surge in Compression Systems." Journal of Turbomachinery 129, no. 3 (June 26, 2006): 437–47. http://dx.doi.org/10.1115/1.2447757.

Full text

Abstract:

The paper deals with the development of a nonlinear one-dimensional modular dynamic model for the simulation of transient behavior of compression systems. The model is based on balance equations of mass, momentum, and energy, which are derived through a general approach and are written by using the finite difference method. The model also takes rotating mass dynamics into account through a lumped parameter approach. Moreover, it reproduces the behavior of the system in the presence of the surge phenomenon through steady-state performance maps, which represent the compressor operation in the inverse flow region by means of a third degree polynomial curve. The model is implemented through the Matlab Simulink tool, where the system of ordinary differential equations is solved by using a fourth- and fifth-order Runge–Kutta method. A sensitivity analysis is carried out to evaluate the influence on compressor outlet pressure oscillations of the model parameters, of the supplied torque, of ambient conditions and of the shape of the compressor characteristic curves. The results show that the model proves effective in capturing the physical essence of surge phenomenon without being computationally too heavy.

APA, Harvard, Vancouver, ISO, and other styles

43

Wang, Yi, Jian Rong, Chenjing Zhou, and Yacong Gao. "Dynamic Estimation of Saturation Flow Rate at Information-Rich Signalized Intersections." Information 11, no. 4 (March 26, 2020): 178. http://dx.doi.org/10.3390/info11040178.

Full text

Abstract:

Intersections are the bottlenecks of the road network. The capacity of signalized intersections restricts the operation of the road network. Dynamic estimation of capacity is necessary for signalized intersections refined management. With the development of technology, more and more detectors were installed near the intersection. It had been the information-rich environment, which provided support for dynamic estimation of capacity. A dynamic estimation method for a saturation flow rate based on a neural network was developed. It would grasp the dynamic change of saturation flow rates and influencing factors. The measure data at three scenarios (through lanes, shared right-turn and through lanes, shared left-turn and through lanes) of signalized intersections in Beijing were taken as examples to validate the proposed method. Firstly, the traffic flow characteristics of the three scenarios and factors affecting the saturation flow rate were analyzed. Secondly, neural network models of the three scenarios were established. Then the hyperparameters of neural network models were determined. After training, the neural network structure and parameters were saved. Lastly, the test set data was validated by the training model. At the same time, the proposed method was compared with the Highway Capacity Manual (HCM) method and the statistical regression method. The results show that both regression models and neural network models have better accuracy than HCM models. In a simple scenario, the neural network models are not much different from the regression models. With the increase of complexity of scenarios, the advantages of neural network models are highlighted. In through-left lane and through-right lane scenarios, the estimated saturation flow rates used by the proposed method were 7.02%, 4.70%, respectively. In the complexity of traffic scenarios, the proposed method can estimate the saturation flow rate accurately and timely. The results could be used for signal control schemes optimizing and operation managing at signalized intersections subtly.

APA, Harvard, Vancouver, ISO, and other styles

44

Filaretov, V., A. Zuev, A. Zhirabok, and A. Protsenko. "Development of Fault Identification System for Electric Servo Actuators of Multilink Manipulators Using Logic-Dynamic Approach." Journal of Control Science and Engineering 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/8168627.

Full text

Abstract:

This paper presents the method of synthesis of faults identification systems for electric servo actuators of multilink manipulators. These actuators are described by nonlinear equations with significantly changing coefficients. The proposed method is based on logic-dynamic approach for design of diagnostic observers for fault detection and isolation. An advantage of this approach is that it allows studying systems with nonsmooth nonlinearities by linear methods only. For solving the task of faults identification, a residual signal feedback was proposed to be used for observers. The efficiency of the proposed fault identification system was confirmed by results of simulation.

APA, Harvard, Vancouver, ISO, and other styles

45

Wei, Ling, Jing Shuai Xiao, and Da Yong Geng. "Design and Application of Var Compensation Method for Traction Power Supply Systems of Electrified Railway." Applied Mechanics and Materials 130-134 (October 2011): 304–8. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.304.

Full text

Abstract:

The application of electric power, which acts as a pillar energy and economic artery in modern society, is one of the most important symbols of the level of development and comprehensive national power of a country. Var is a crucial factor for the design and operation of AC power systems, and is closely bound up with the safety, stabilization, and economical operation of power systems. With the development of electrified railway, the importance of the dynamic var compensation for traction power supply systems of electrified railway becomes more and more distinct. Developing the var compensation strategy vigorously has important senses in theory and practice. In this article, synthetically considering technique and economic leval of power systems in our country, parameters modeling and design and verification and specific engineering application of a var compensation method are presented. This method is a preferable one for resolving undesirable effect on power systems from traction power supply systems of electrified railway, especially having dynamic and real time characteristics of var compensation.

APA, Harvard, Vancouver, ISO, and other styles

46

Behr, Richard A., and Abdeldjelil Belarbi. "Seismic Test Methods for Architectural Glazing Systems." Earthquake Spectra 12, no. 1 (February 1996): 129–43. http://dx.doi.org/10.1193/1.1585871.

Full text

Abstract:

An ongoing effort is being made at the University of Missouri-Rolla to develop standard laboratory test methods and codified design procedures for architectural glass under seismic loadings. Recent laboratory work has yielded some promising results regarding the development of an appropriate seismic test method for architectural glass, as well as identifying ultimate limit states that quantify the seismic performance and damage thresholds of various glass types. Specifically, a straightforward “crescendo-like” in-plane dynamic racking test, performed at a constant frequency, has been employed successfully. Two ultimate limit states for architectural glass have been defined: (1) a lower ultimate limit state corresponding to major glass crack pattern formation; and (2) an upper limit state corresponding to significant glass fallout. Early crescendo tests have yielded distinct and repeatable ultimate limit state data for various storefront glass types tested under dynamic racking motions. Crescendo tests will also be used to identify and quantify serviceability limit states for architectural glass and associated glazing components under dynamic loadings. These limit state data will support the development of rational design procedures for architectural glass under seismic loadings.

APA, Harvard, Vancouver, ISO, and other styles

47

Hanuš, Ladislav. "Sustainability analysis of agricultural systems." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 52, no. 1 (2004): 103–12. http://dx.doi.org/10.11118/actaun200452010103.

Full text

Abstract:

The main aim of this research is to propose an evaluation method as a tool for measurement of sustainable development in agriculture. The research has three parts: 1) indication, 2) evaluation and 3) application. Three aggregate and a group of partial indicators were selected for ecological, economic and social dimension of agricultural system. As the aggregate indicators were proposed: Material and Energy Costs, Operating Income and Personal Costs. Two evaluation methods for calculation of relative sustainability for group of farms were proposed: The Method of Comparison of Indicator Values and The Method of Comparison of Weighted Interval Sustainability. Each method was tested in static and dynamic variant with using of financial data of 30 farms in the CR. Proposed Index of Weighted Interval Sustainability is applicable in farm management and in agricultural policy with aim to redistribute subsidies.

APA, Harvard, Vancouver, ISO, and other styles

48

Nuryadin, Didi, Samsubar Saleh, Amirullah Setya Hardi, and Evita Hanie Pangaribowo. "Developing a Dynamic Model for Sustainable Development in Yogyakarta City." Indonesian Journal of Planning and Development 4, no. 2 (October 31, 2019): 57–68. http://dx.doi.org/10.14710/ijpd.4.2.57-68.

Full text

Abstract:

Developments in Yogyakarta City have driven residents of the city and its outskirts to access available social facilities, such as education, healthcare, and employment. If this continues, various social and urban problems may emerge, including increased population density and traffic congestion. Another implication of this process is decreased environmental carrying capacity as a result of continued use of non-sustainable approaches to development. This study aims to model the complexity of the relationships between aspects i.e., social, economic, and environmental of the area studied. The system dynamics method is used, as it is a disciplinary approach that is able to fully explore problems that occur in interconnected systems rather than examining incidents partially. As the basis for this model, the causal loop diagram (CLD) model has been applied based on literature studies and field observations. The result shows that developments in the tourism and education sectors are the main factors affecting the intersections of social, economic, and environmental considerations.

APA, Harvard, Vancouver, ISO, and other styles

49

Zhan, Liu, and Zhenya Duan. "Development of a transient gas dynamic model for the simulation of pulsation in reciprocating compressor piping systems." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 232, no. 6 (October 26, 2017): 685–95. http://dx.doi.org/10.1177/0954408917737586.

Full text

Abstract:

The subject of this paper is to develop a nonlinear transient dynamic model for simulating the pressure pulsation in reciprocating compressor piping systems. The model allows the interaction between the piping response and compressor processes. The two-step Lax–Wendroff method is employed to obtain solutions to the unsteady flow equations at internal points in a pipe, and the Trapezoidal version of the method of characteristics is adopted for handling boundary conditions. The compressor, which serves as a boundary condition for predicting the piping's pressure pulsation, is modeled comprehensively on the basis of the first law of thermodynamics, the valve dynamics assumed as a one-degree-of-freedom system and the flow through valve by introducing an effective area for flow through the valve throat. It is worth to note that, to solve the compressor boundary condition, all the related equations are necessary to be solved simultaneously to obtain the pulsating pressure in the pipe end, pressure variation in the cylinder, valve response, mass flow rate, indicated power, and other compressor performance parameters. Numerical results based on these proposed modeling techniques show a good agreement with previous measured data.

APA, Harvard, Vancouver, ISO, and other styles

50

DIESSEL, OLIVER, and HOSSAM ELGINDY. "ON DYNAMIC TASK SCHEDULING FOR FPGA-BASED SYSTEMS." International Journal of Foundations of Computer Science 12, no. 05 (October 2001): 645–69. http://dx.doi.org/10.1142/s0129054101000709.

Full text

Abstract:

The development of FPGAs that can be programmed to implement custom circuits by modifying memory has inspired researchers to investigate how FPGAs can be used as a computational resource in systems designed for high performance applications. When such FPGA–based systems are composed of arrays of chips or chips that can be partially reconfigured, the programmable array space can be partitioned among several concurrently executing tasks. If partition sizes are adapted to the needs of tasks, then array resources become fragmented as tasks with varying requirements are processed. Tasks may end up waiting despite their being sufficient, albeit fragmented resources available. We examine the problem of repartitioning the system (rearranging a subset of the executing tasks) at run–time in order to allow waiting tasks to enter the system sooner. In this paper, we introduce the problems of identifying and scheduling feasible task rearrangements when tasks are moved by reloading. It is shown that both problems are NP–complete. We develop two very different heuristic approaches to finding and scheduling suitable rearrangements. The first method, known as Local Repacking, attempts to minimize the size of the subarray needing rearrangement. Candidate subarrays are repacked using known bin packing algorithms. Task movements are scheduled so as to minimize delays to their execution. The second approach, called Ordered Compaction, constrains the movements of tasks in order to efficiently identify and schedule feasible rearrangements. The heuristics are compared by time complexity and resulting system performance on simulated task sets. The results indicate that considerable scheduling advantages are to be gained for acceptable computational effort. However, the benefits may be jeopardized by delays to moving tasks when the average cost of reloading tasks becomes significant relative to task service periods. We indicate directions for future research to mitigate the cost of moving executing tasks.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Dynamic systems development method (DSDM)'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles