• Title/Summary/Keyword: regenerative process

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REGENERATIVE BOOTSTRAP FOR SIMULATION OUTPUT ANALYSIS

  • Kim, Yun-Bae
    • Proceedings of the Korea Society for Simulation Conference
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    • 2001.05a
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    • pp.169-169
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    • 2001
  • With the aid of fast computing power, resampling techniques are being introduced for simulation output analysis (SOA). Autocorrelation among the output from discrete-event simulation prohibit the direct application of resampling schemes (Threshold bootstrap, Binary bootstrap, Stationary bootstrap, etc) extend its usage to time-series data such as simulation output. We present a new method for inference from a regenerative process, regenerative bootstrap, that equals or exceeds the performance of classical regenerative method and approximation regeneration techniques. Regenerative bootstrap saves computation time and overcomes the problem of scarce regeneration cycles. Computational results are provided using M/M/1 model.

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Some properties of the regenerative process

  • Shim, Donghee
    • Korean Management Science Review
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    • v.14 no.2
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    • pp.63-68
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    • 1997
  • Limiting probability in the steady state of regenerative process is one of the most useful characteristics. The formula for this limiting probability in the steady state of the regenerative process is presented in this paper. Because this formula is for the general model, it can be applied to many special systems including 2-unit redundant system. An example for this formula is also presented.

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Genetic Reprogramming after Somatic Cell cloning

  • Tian, X.Cindy;Xu, Jie;Xue, Fei;Kubota, Chikara;Du, Fuliang;Yang, Xiangzhong
    • Proceedings of the Korean Society of Embryo Transfer Conference
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    • 2002.11a
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    • pp.43-55
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    • 2002
  • Cloning by nuclear transfer in mammals using somatic cells has enormous potential applications. However, somatic cloning has been inefficient in all species in which NT is successful. High abortion and fetal death rates have been observed. These developmental defects have been attributed to incomplete nuclear reprogramming by the somatic cloning process. In this review, we will discuss studies conducted in our labs to understand the nuclear reprogramming process.

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Expected Number of Visits of the Regenerative Process (재생프로세스에서 기대방문횟수에 대한 연구)

  • 심동희
    • Journal of the Korean Operations Research and Management Science Society
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    • v.25 no.3
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    • pp.35-39
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    • 2000
  • Expected number of visits in the steady state of the regenerative process is one of the most useful characteristics. The formula for this expected number of visits in the steady state of the regenerative process is presented in this paper. Because this formula is for the general model, it can be applied to many special systems including 2-unit redundant system. An example for this formula is also presented.

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Effects of Several Cardioactive Agents on the Regenerative $Ca^{++}$ Release in the Mechanically Disrupted Cardiac cells (심근에 작용하는 수종 약물이 쥐의 심근의 'Regenerative $Ca^{++}$ Release'에 미치는 영향)

  • Kang, Doo-Hee;Lee, Joong-Woo
    • The Korean Journal of Physiology
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    • v.11 no.2
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    • pp.9-16
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    • 1977
  • The present experiment was conducted to see whether or not several cardioactive agents influence the 'regenerative $Ca^{++}$ release' in the mechanically disrupted cardiac cells. The mechanically disrupted cardiac cells were prepared by the method of Kerrick and Best from the ventricle of rat. The tension development of the disrupted cardiac cells was measured with a mechanoelectric transducer (RCA 5734). The results were summarized as follows 1) 2 mM caffeine enhanced the regenerative $Ca^{++}$ release, whereas 2 mM Procaine inhibited the $Ca^{++}$ release as reported by other investigators. 2) Epinephrine at concentrations of $10^{-7},\;10^{-6}\;and\;10^{-5}M$ increased the regenerative $Ca^{++}$ release significantly but showed a poor dose response on the $Ca^{++}$ release. 3) Propranolol showed no effect on the regenerative $Ca^{++}$ release when studied alone. Furthermore, it showed no antagonistic effect on an increased regenerative $Ca^{++}$ release induced by epinephrine. 4) Other cardioactive agents such as acetylcholine, ouabain, isoproterenol and c-AMP at concentrations of $10^{-6}M$ showed no effect on the regenerative $Ca^{++}$ release. From the above results, it may be concluded that the cardioactive actions of these agents are not related directly to the process of regenerative $Ca^{++}$ release.

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The study on frame work of developing and modification with expert system program software (전문가 시스템소프트웨어 유지 보수에 있어서 프레임워크에 관한 연구)

  • Chang-Duck Jung
    • Journal of the Korea Computer Industry Society
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    • v.5 no.4
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    • pp.503-510
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    • 2004
  • The summary of this paper is as follows. The literature on existing expert system maintenance software technique are reviewed in Module program, a case of assembly line process problem at construction industry and planning expert system to solve this problem at construction as a standard configured process system are discussed. the regenerative expert system approach for the construction process expert system and its example for the assembly line construction process appear in the research also, this paper shows the architecture and some feature of the CES.(Construction Expert System), which is a prototype implemented for the regenerative expert system approach. the paper introduce the framework of the regenerative expert approach as a general framework of developing and maintaining a large-scale expert systems.

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Development of Bulging Process for Regenerative Cooling Nozzle of Liquid Rocket Thrust Chamber (액체로켓 연소기 재생냉각형 노즐의 벌징 공정 개발)

  • Ryu, Chul-Sung;Choi, Hwan-Suk
    • Aerospace Engineering and Technology
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    • v.7 no.2
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    • pp.103-109
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    • 2008
  • A study has been conducted on the bulging process of regenerative cooling nozzle which is essential for the manufacturing of liquid rocket thrust chamber. Tension tests have been performed for the material to be used for the development of the bulging process and mechanical properties are obtained by the test. Two or three bulging tools were required to complete the bulging process. The necking of the material was a major failure encountered in the bulging process and a research has revealed that grain size of the material has considerable effect on its occurrence. The presently developed bulging process with a controlled grain size material has been successfully applied to the manufacturing of subscale and 30-tonf full scale regeneratively cooled nozzle while demonstrating the applicability and usefulness of the presently developed bulging process.

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The Importance of Strengthening the Role of the Institutional Review Board and the Human Research Protections Program following the Revision of the Act on the Safety and Support of Advanced Regenerative Medicine and Advanced Biopharmaceuticals ('첨단재생의료 및 첨단바이오의약품 안전 및 지원에 관한 법률' 개정에 따른 '기관생명윤리위원회(Institutional Review Board)' 역할 및 '임상시험 및 대상자보호프로그램(Human Research Protections Program)' 강화의 중요성)

  • Byung Soo Kim
    • The Journal of KAIRB
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    • v.6 no.1
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    • pp.1-4
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    • 2024
  • The strengthening of Institutional Review Board (IRB) and Human Research Protection Program (HRPP) for clinical research on advanced regenerative medicine reflecting the 3 Principles of the Belmont Report (Respect, Beneficence, Justice) is very important. The research institution IRB should naturally be in charge of managing the clinical research process. And it is crucial to reinforce HRPP for the protection of research subjects in institutions conducting advanced regeneration clinical research. So, it is needed to establish a Protection System for Advanced Regenerative Medical Research Subjects composed of clinical research management communication system for advanced regenerative medicine between KAIRB (Korean Association of IRB) of research institutes and National Management Agency for Advanced Regenerative Medical Research. In advanced regenerative medicine clinical research to verify safety and efficacy of the investigational drugs to the subjects with rare and incurable diseases rather than to treat the patients, it is hoped that a management system that guarantees the scientific characteristics of research and the rights of research subjects would be well organized and operated.

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Effects of performance analysis of a desiccant cooling system with a direct evaporative cooler in the regeneration process (재생 입구 직접증발냉각기 적용이 제습냉방시스템 성능에 미치는 영향)

  • Dash, Ulziiutas;Oh, Myung-Do
    • Proceedings of the SAREK Conference
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    • 2009.06a
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    • pp.633-638
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    • 2009
  • In this study the performance analysis and cooling capacity of desiccant cooling system incorporating regenerative cooler and direct evaporative cooler in the regeneration air inlet were investigated on the condition of low regeneration temperature and time rotation 180s and area ratio of regeneration to dehumidification section 0.7. The cooling capacity and COP are evaluated at various effectiveness values of the direct evaporative cooler or the regenerative evaporative cooler. As either of effectiveness of the regenerative and direct evaporative coolers of desiccant cooling system increases, both the cooling capacity and COP increase, but effectiveness value of regenerative cooler gives the opposite effect on the system performance. It is found that effectiveness of regenerative cooler less than 0.7 shows the optimum cooling capacity.

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Maximum Power Recovery of Regenerative Braking in Electric Vehicles Based on Switched Reluctance Drive

  • Namazi, Mohammad Masoud;Saghaiannejad, Seyed Morteza;Rashidi, Amir;Ahn, Jin-Woo
    • Journal of Electrical Engineering and Technology
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    • v.13 no.2
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    • pp.800-811
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    • 2018
  • This paper presents a regenerative braking control scheme for Switched Reluctance Machine (SRM) drive in Electric Vehicles (EVs). The main purpose is to maximize the recovered energy during battery charging by taking into account the nonlinear physical characteristics of the Switched Reluctance Machine. The proposed regenerative braking method employs the back-EMF in the generation process as a complicated position-dependent voltage source. The proposed maximum power recovery (MPR) operation of the regenerative braking is first based on the maximization of the extracted power from the machine and then the maximization of the power transferred to the battery. The maximum power extraction (MPE) from SRM is based on maximizing the energy conversion ratio by the calculation of the optimum PWM switching duty cycle, turn-on, and turn-off angles. By using the impedance matching theorem that allows the maximum power transfer (MPT) of the MPE, the proposed MPR is achieved. The parametric averaged value modeling of the machine phase currents in the chopping control mode is used for MPR realization. By following this model, a nonlinear equivalent input resistance is derived for the battery internal resistance matching. The effectiveness of the proposed regenerative braking method is demonstrated through simulation results and experimental implementation.