• Title/Summary/Keyword: On-line Account system

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A Construction Design and Simulation Model Analysis of Electronic Banking Account Ledger Calibration System (금융계정계 원장보정시스템 설계구축에 관한 연구 및 시뮬레이션 분석)

  • Song, Jai-Moon;Jung, Byeong-Soo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.38C no.7
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    • pp.563-572
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    • 2013
  • Based on this paper, in case of the on-line account system in finance industry temporarily stops working because of the on-line data change from 00:00 to 00:30, it conducts in extra placement server and the director update is carried out via center cut or on-line server to make the service possible through customer director reproduction revision. So, from the simulation result in financial operating system, We retain the batch director & backup director securely about the important time data in each account classes on-line director without even one second interruption.

Issues of Education Expenses and Policy Implication of On-Line Education Service for the Middle Aged Families (중년기 가족의 교육비 문제와 디지털 시대의 해결방안 모색)

  • 손상희;정영숙
    • Journal of Families and Better Life
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    • v.21 no.1
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    • pp.49-60
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    • 2003
  • The purpose of this study is to analyze expenditure on children's private, after-school education, perceptional need for private education, and budget planning pattern for the expenditure of education applying survey data, and to investigate current situation to Identify solving planning for digital age. taking on-line educational service system and internet financial planning for children's educational expenditure into account. Under the purposes, this study especially focused on the condition of on-line educational service system and the merits as well as problems of the system, the need for household financial planning for children's education, and the condition or nature of internet financial planning system, in terms of providing market information and of suggesting policy implications.

A Study on the Estimating Locations of Faults on Distribution Power Systems (배전계통 고장위치 검출방법에 관한 연구)

  • Kim Mi-Young;Oh Yong-Taek;Rho Dae-Seok
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.53 no.12
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    • pp.670-677
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    • 2004
  • The Conventional approach for estimating the locations of transmission line shunt faults has been to measure the apparent impedance to the fault from a line terminal and to convert the reactive component of the impedance to line length. But, these methods do not adequately address the problems associated with the fault location on distribution systems. This thesis presents a technique that estimates the location of shunt fault on a radial distribution system that has several single and multiphase laterals. Tapped loads and non-homogenity of the distribution system are take into account. The developed technique, which can handle shunt faults was tested to evaluate its suitability. Results from computer simulation of faults on a model of a 25KV distribution lines like real system are presented. The results approved that the proposed technique works well for estimating the locations of the distribution line shunt faults.

- A Study on Development of OLTP System for Supporting the ERP System - (ERP 시스템 지원을 위한 OLTP 시스템 개발에 관한 연구)

  • 양광모;한영근;강경식
    • Journal of the Korea Safety Management & Science
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    • v.5 no.2
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    • pp.145-154
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    • 2003
  • Recently, many companies want to accept and operate ERP (Enterprise Resource Planning) system in their fields ERP does not only include business, but also include finance, account, trade, personnel and BPR(Business Process Reengineering). Especially, it is necessary to have ERP system for companies which have lots of external business such as trade and communication sector. And then, in this paper, I will think about OLTP (On-Line Transaction Processing) system for operating ERP system and improve its defects that can operate more effective sales, circulation, demand plan. But it is regrettable that I can not make a comparative analysis with other systems because the ERP system is still on the introductory stage for the company studies and the benefits have not been realized yet. Another limitation of this research is its narrow scope of study in which only the raw material inventory system for a single company is covered. In the future, however, ERP system would be adopted by many corporations, which would help us to launch a comparative study on the results of ERP system implementation as a future direction of research.

A Study on the Optimal Load Shedding Considering Alleviation of the Line Overload (선로과부하해소를 고려한 최적부하간단에 관한 연구)

  • 송길영;이희영
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.36 no.6
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    • pp.381-389
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    • 1987
  • This paper presents a method for optimal load shedding in preserving a system security following abnormal condition as well as a sudden major supply outage. The method takes account of static characteristic of generators control and voltage and system frequency characteristic of loads. The optimization problem is solved by a gradient technique to get the maximal effect by the least quantity of load shedding considering line overloads as well as voltage disturbances and system frequency. The method is illustrated on a 8-bus system. It has been found that the use of the proposed algorithm for model systems alleviate the line overload more efficiently than the former method. It is believed that this method will be useful in security studies and operational planning.

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Fuzzy Rulebase Application for Estimation of Snow Accretion on Power Lines and Deicing Countermeasure Plan (퍼지 룰베이스에 의한 전선착설 예측 및 대책 지원 기법)

  • 최규형
    • Journal of Institute of Control, Robotics and Systems
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    • v.9 no.10
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    • pp.782-788
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    • 2003
  • Making deicing countermeasure plan against snow accretion on power line is a very complicated problem, which should take into account both the possibility of accidents due to snow accretion on power line and the stable operation of power system. As knowledge engineering can be a good solution to this field of problems, a prototype expert system to assist power system operators in forecasting snow accretion on power lines and making a list of all the feasible and effective deicing countermeasures has been developed. The system has been remodelled into a fuzzy expert system by adopting fuzzy rulebase and fuzzy inference method to systematically process the fuzziness included in the heuristic knowledges. Simulation results based on the past snow accretion accident data show that the proposed system is very promising.

Protective Management System followed Distance Relay characteristics for Transmission Line with the Unified Power Flow Controller (UPFC연계시 거리계전기 동작특성에 따른 보호 관리 시스템)

  • Suh, Jung-Nam;Jung, Chang-Ho;Cho, Jong-Man;Kim, Jin-O
    • Proceedings of the KIEE Conference
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    • 2001.11b
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    • pp.296-298
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    • 2001
  • This paper represents protective management system for transmission line involving the UPFC(Unified Power Flow Controller) device, which is the most vigorous component of FACTS. The presence of the UPFC significantly affects the line parameters of transmission system, which are also influenced by the distance relay setting. Moreover, depending on the UPFC location and its parameters, zones of setting the distance relay will be changed. Therefore, established protective system should be taken into account the variable injected voltage of the UPFC and constructed data base system.

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Line-Interactive UPS for Low-Voltage Microgrids

  • Zhang, Ping;Cai, Huanyu;Zhao, Hengyang;Shi, Jianjiang;He, Xiangning
    • Journal of Power Electronics
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    • v.15 no.6
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    • pp.1628-1639
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    • 2015
  • Line-interactive uninterruptible power supply (UPS) systems are good candidates for providing energy storage within a microgrid. In this paper, a control scheme for a line-interactive UPS system applied in a low-voltage microgrid is presented. It is based on the Q-w and P-E droop control to achieve a seamless transition between grid-connected and stand-alone operation modes. Moreover, a new model for designing the controllers is built in the dq-frame based on the instantaneous power definition. The new-built model takes into account the dynamic performance of the output impedance of the inverter in the dq-frame and can be evaluated in the time domain. Compared to the traditional model based on the instantaneous power definition, the new-built model is more accurate to describe the dynamic performance of the system. Simulation and experimental results obtained with a microgrid consisting of two 40-kW line-interactive UPS systems are given to validate the control strategy of the line-active UPS system and the accuracy of the new-built model.

The Best Line Choice for Transmission System Expansion Planning on the Side of the Highest Reliability Level

  • Sungrok Kang;Trungtinh Tran;Park, Jaeseok;Junmin Cha;Park, Daeseok;Roy Billinton
    • KIEE International Transactions on Power Engineering
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    • v.4A no.2
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    • pp.84-90
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    • 2004
  • This paper presents a new method for choosing the best line for transmission system expansion planning considering the highest reliability level of the transmission system. Conventional methodologies for transmission system expansion planning have been mainly focused on economics, which is the minimization of construction costs. However, quantitative evaluation of transmission system reliability is important because successful operation and planning of an electric power system under the deregulated electricity market depends on transmission system reliability management. Therefore, it is expected that the development of methodology for choosing the best lines considering the highest transmission system reliability level while taking into account uncertainties of transmission system equipment is useful for the future. The characteristics and effectiveness of the proposed methodology are illustrated by the case study using a MRBTS.

A Study on the Synthesis of Multivalued Logic System Using Current-Mode Techniques (전류방식기법에 의한 다치론이계의 구성에 관한 연구)

  • 한만춘;신명철;박종국;최정문;김락교;이래호
    • 전기의세계
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    • v.28 no.1
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    • pp.43-52
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    • 1979
  • Recently, interest in multivalued(MV) logic system has been increased, despites the apparent difficulties for practical application. This is because of the many advantages of the MV compared with the 2-valued logic systems, such as; (a) higher speed of arithmetical operation on account of the smaller number of digits required for a given data, (b) better utilization of data transmission channels on account of the higher information contents per line, (c) potentially higher density of information storage. This paper describes a MV switching theory and experimental MV logic elements based on current-mode logic technique. These elements tried were a 3-stable pulse generator, a ternary AND, a ternary OR, a MT circuit and a ternary inverter. Tristable flops which are indispensable for constituting a ternary shift register are synthesized using these gates. A BCD to TCD decoder, and vice versa, are proposed by using a ternary inverter and some binary gates. Thus, the feasibility of a large scale MV digital system has been demonstrate.

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