• Title/Summary/Keyword: e-SRM

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User Perception on E-resources at University Libraries in India: A Case Study of SRM University (인도대학도서관에서전자자료에대한이용자지각연구: SRM 대학교사례를중심으로)

  • Rajendran, P.;Ganesh, P.
    • Journal of Korean Library and Information Science Society
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    • v.46 no.4
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    • pp.641-654
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    • 2015
  • The researcher conducts the survey through questioner method and analyzed the data in detail about E-resources available at SRM University library. The objectives of the study are to find out the awareness of use and purposes and their level of satisfaction of users. Further the researcher identifies the barrier and the ways and means of improvement of the use of E-resources. A total of 1,205 respondent was participating in this survey.

Analysis of Two-phase E-core Switched Reluctance Machines Using Magnetic Equivalent Circuit Technique (자기등가회로 기법을 사용한 2상 E-core SRM의 해석에 관한 연구)

  • Lee, Chee-Woo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.11
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    • pp.1986-1989
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    • 2010
  • The modification of magnetic structures for an E-core switched reluctance machine (SRM) comprising two segmented stator cores or a monolithic stator core is presented for ease of assembly, good manufacturability, mechanical robustness, and electromagnetic performance improvement. The E-core stator has four small poles with phase windings and two or four large poles (hereafter referred to as common poles), in between. The common poles are shared by both phases for positive torque generation during the entire operation. The E-core SRMs are compared to a conventional two-phase SRM. The comparison includes cost savings, torque, copper and core losses, and efficiency in order to validate the distinct features of the E-core SRMs. Magnetic equivalent circuit (MEC) technique is employed for proving the benefits of the E-core common-pole structure.

BestChoice SRM: A Simple and Practical Supplier Relationship Management System for e-Procurement (BestChoice SRM: 전자 조달을 위한 단순하며 실질적인 공급사 관계 관리 시스템)

  • Lee, Dong-Joo;Kang, Seung-Seok;Lee, Sang-Keun;Kim, Young-Gon;Chang, Jun-Ho;Lee, Sang-Goo
    • The Journal of Society for e-Business Studies
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    • v.12 no.3
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    • pp.177-191
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    • 2007
  • Supplier relationship management (SRM) is an important contributor to a company's efficiency and credibility. Although several ways are used to provide SRM functionality, these are often not easily integrated with existing procurement systems. We designed and implemented a practical SRM system called BestChoice SRM and present its design and architecture. It has the core functionality of SRM with the simple adaptability of BestChoice which is a decision support system for evaluating suppliers with the aid of visualized analysis It allows seamless integration with existing systems and permits flexible strategy changes as market conditions shift. The key to this flexibility is template-based segmentation. Ease of integration was demonstrated through the installation of BestChoice SRM at a major Korean commercial e-procurement agency.

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Design and Implementation of e-SRM System Supporting Individual Adjusting Feedback in Web-based Learning Environment (웹 기반 학습 환경에서 개별 적응적 피드백을 지원하는 e-SRM 시스템의 설계 및 구현)

  • Baek, Jang-Hyeon;Kim, Yung-Sik
    • Journal of The Korean Association of Information Education
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    • v.8 no.3
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    • pp.307-317
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    • 2004
  • In web-based education environment, it is necessary to provide individually adjusting feedback according to learner's characteristic. Despite this necessity, it is a current state that there are difficulties in deriving the variables of learners' characteristics and lack in developing the systematic strategies and practical tools for providing individually adjusting feedback. This study analyzed the learners' learning patterns, one of learner's characteristic variables regarded as important in web-based teaching and learning environment by employing Apriori algorithm, and also grouped the learners by learning pattern. Under this framework, the e-SRM feedback system was designed and developed to provide learning content, learning channel, and learning situation, etc. for individual learners. The proposed system in this study is expected to provide an optimal learning environment complying with learner's characteristic.

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Novel Control Scheme for High Performance Switched Reluctance Motor Drive (SRM의 고성능구동을 위한 새로운 제어방식)

  • Oh, S.G.;Ahn, J.W.;Cho, Y.B.;Hwang, Y.M.
    • Proceedings of the KIEE Conference
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    • 1994.07a
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    • pp.485-487
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    • 1994
  • A novel control scheme for a Switched Reluctance Motor(SRM) drive is described. The control scheme which is to increase torque, to decrease torque ripples and easy to commutate is suggested. The conditions for high torque drive which includes flat-topped phase current and voltage control arc analyzed and adopted in this control scheme. Flat-topped current is achived via dc-link voltage control. The suggested control system was tested to verify this suggestion.

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Electromagnetic and Vibration Analysis of E-core Switched Reluctance Motor with Permanent Magnets and Auxiliary Windings

  • Saranya, S.;Balaji, M.
    • Journal of Power Electronics
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    • v.19 no.2
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    • pp.540-548
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    • 2019
  • In this work a new configuration of E-core stator Switched Reluctance Motor (SRM) with permanent magnets and auxiliary windings embedded in the stator yoke is proposed. For the proposed configuration of SRM electromagnetic analysis is performed using Finite Element Analysis (FEA) based computer aided design package MagNet and to emphasize its merits a comparison is drawn with existing hybrid excitation configuration of SRM. In addition, the vibration characteristics of the motor are analyzed by performing modal and transient analysis using the ANSYS package. Results of the analysis reveals that the proposed configuration of SRM exhibits better electromagnetic and vibration characteristics and is capable of competing with the existing topologies in the variable speed market.

Determination of the Intracellular Concentrations of Metabolites in Escherichia coli Collected during the Exponential and Stationary Growth Phases using Liquid Chromatography-Mass Spectrometry

  • Park, Chang-Hun;Park, Chang-Hun;Lee, Youn-Jin;Lee, Sang-Yup;Oh, Han-Bin;Lee, Jin-Won
    • Bulletin of the Korean Chemical Society
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    • v.32 no.2
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    • pp.524-530
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    • 2011
  • In the present study, we demonstrate that SRM LC-MS/MS method developed by Luo et al. (ref. 10) can be successfully applied to the quantitative analysis of intracellular metabolites in E. coli that are collected at the exponential and stationary growth phases. A focus is given on measuring the changes in the concentrations of intracellular metabolites in batch cultures, which were induced during both the dynamically changing exponential and stationary growth phases. The following intracellular metabolites are quantified in the exponential and stationary phases of E. coli growth, using the SRM mode of a triple quadrupole mass spectrometer: glucose-1-phosphate, fructose-1,6-bisphosphate, phosphoenolpyruvate, pyruvate, acetyl-coenzyme A, 6-phosphogluconate, ribulose-5-phosphate, xylulose-5-phosphate, erythrose-4-phosphate. The determined intracellular metabolite concentration profiles are shown to be in a good agreement with the growth profiles of E. coli, which clearly indicates that SRM LC-MS/MS can be successfully used for following the metabolite changes induced at different growth stages.

A Study on the Comparison of SRMs with 3 Rotor Poles (3개의 회전자 극을 갖는 SRM의 비교 연구)

  • Bae, Jun-Kyung;Oh, Seok-Gyu
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.5
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    • pp.92-97
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    • 2014
  • The SRM is a doubly salient, singly excited machine. The torque is developed by the tendency for the magnetic circuit to adopt a configuration of minimum reluctance, i.e. for the rotor to move into in line with the stator poles and to maximize the inductance of the coils excited. It is common practice to combine them into groups of poles which are excited simultaneously; for example, 8/6 SRM (8 stator poles and 6 rotor poles) for 4 phases, 6/4, 12/8 SRM for 3 phases, 4/2, 6/3 SRM for 2 phases. Small number of phases in two-phase SRMs allows more cost savings with regards to the switching devices in the converter. The stator back irons of two phase 6/3 SRM and C-core 4/3 SRM does not experience any flux reversal as the flux is in the same direction whether phase A or B is excited. In this study, the similarities, the differences, and structural characteristics between the two SRMs was studied, The magnetic analysis also has been carried out by the finite element method analysis (FEM).

Study on the D.C Excitation Commutation Method of SRM for Reduction of Vibration/Acoustic Noise (SRM의 진동.소음의 저감을 위한 직류여자 전류방식에 관한 연구)

  • 오석규;추영배;이일천;황영문
    • Proceedings of the KIPE Conference
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    • 1999.07a
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    • pp.147-150
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    • 1999
  • SRM drives generate large vibration and acoustic noise because it is commutated individually by step pulse m.m.f on each phase pole. The frequency or motor speed of peak vibrations and acoustic noises is coincided with the natural resonant frequency of the magnetic structure and frame material. And this radial vibration force is induced on the phase commutation region. This paper suggest the new electromagnetic structure of SRM with auxiliary commutation winding excited d.c e.m.f.. This phase- commutating winding is coupled magnetically between one phase winding and the vibrating force is falled down. As a result, SRM with d.c exciting commutation winding is very useful to reduce vibration and acoustic noise of SRM drive.

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Computation of theoretical design parameter of sin91e Phase SRM for a blower drives (송풍기 구동용 단상 SRM의 이론적 설계파라미터 산정)

  • Lee, Jong-Han;Lee, Chung-Won;Lee, Eun-Woong;Oh, Young-Woong
    • Proceedings of the KIEE Conference
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    • 2003.04a
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    • pp.88-90
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    • 2003
  • SRM has a characteristic of a robust, simple structure and wide operating ranges. So, recently it has studied and developed in many kinds and forms with the technology of power electronics and analysis and design by use of computer. Also, It is used in a very wide range of industrial applications. In particular, single phase switched reluctance motor has a merit in practical use because it has simple operating drives and control systems, very high energy density per unit volume comparing with three phase SRM. But it must have a starting device. In this paper design procedures of single phase SRM development for blower drives are presented. It is selected the design parameters by compared with design theory of general electric machine and poly phase SRM. Also it is simulated the designed prototype model by FEM for the prediction of characteristics.

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