• Proceedings of the Korea Information Processing Society Conference
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• 2004.11a
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• pp.705-708
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• 2004

한국전력공사는 검침업무의 복잡성을 단순화하고 유지보수에 따른 비용절감 등의 이유로 특정 제조회사의 통신방식이나 데이터구조 등에 구애받지 않도록 표준화된 전자식 전력량계의 통신프로토콜과 운용프로그램 개발을 수행하였다. 전자식 전력량계의 통신프로토콜을 통일하고 표준화된 검침용 운용프로그램을 사용함으로써 검침원에게는 다양한 검침용 운용프로그램 사용법을 익혀야하는 불편함을 없애고 각사별 검침용 장비의 유지관리에 따른 비용을 절감할 뿐만 아니라 저비용으로 보다 신뢰성 있는 원격검침 시스템 구축이 용이할 것으로 기대된다. 본 논문에서는 전자식 전력량계의 통신 프로토콜과 데이터구조, 운용프로그램 설계 및 구현에 대해 소개한다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.05c
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• pp.15-18
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• 2003

In recent years, there has been keen interest in phosphor materials responding X-ray. Cesium iodide of the materials is a material with a high $\gamma$-ray stopping power due to its relative high density and atomic number. CsI is noted for its high resistance to thermal and mechanical shock due to the absence of a cleavage plane. To design the structure of CsI detector, we analysed the structure with SEM and XRD and measured UV meter.

• Proceedings of the KIEE Conference
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• 1996.07b
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• pp.720-723
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• 1996

The recent summer power peak crisis has been caused by excessive use of cooling loads at daily peak time in summer. The yearly load shape of KEPCO has gradually became very steep valley. Under this situation, more efficient DSM(Demand Side Management) tools are fully required for summer peak clipping and shaving. In this paper, the KEPCO's Jeju-Do model project for DSM, especially for Demand Controller, is presented. Demand Controller was evaluated to have the very high economical efficiency against the investment in equipment, as compared with another DSM tools. There were some serious problem to apply Demand Controller to many customers in the aspect to synchronization with KEPCO's watthour meter. But these problems have solved by Keyin's new Demand Controller using vision algorithm.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.57 no.8
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• pp.1349-1355
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• 2008

The paper shows the analysis of operating conflict of OCGR trip events and metering errors in the photovoltaic generation, wind generation distributed generation customers with no defect of the distributed generation facilities, which are connected to 22.9kV distribution lines. To analyze problems with metering errors and OCGR fault event, a power quality analyzer and PSIM program were used to test the field and to simulate in Sun-Cheon photovoltaic generation and Seo-Cheon photovoltaic generation customers. With the trial distribution line, the result of analysis was verified to prove with the same situation of the actual field. This paper suggests short term and long term countermeasures of OCGR fault events, analysis of over and shortage of metering errors in distributed generation customers.

• Journal of the Korean Institute of Navigation
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• v.20 no.2
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• pp.97-107
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• 1996

The method of Electromagnetic Wave Immunity Test is continuously endeavored by IEC and CISPR as international unification, but it has not been established yet. The main reason is why it is difficult to obtain the measurement method and normalization of threshold to find out the complicated parameters for Electromagnetic Wave immunity Test. So far, thus, the Electromagnetic Wave Immunity Test is carried out case by case as the electromagnetic environment, which is set up Electromagnetic Wave Immunity Test. This study has developed an algorithm and measurement software suitable for IEC1000-4 Regulations, where a ready-made Amplifier, and Signal Generator have been used and an interconnecting Interface Board has been constructed for connecting with the other apparatuses, i.e., RF Switch, Power Meter, Field Sensor, Pre-Amp., etc. Therefore, we have achieved the aim to develop an automated software using OOP method and the measurement system.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.11a
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• pp.319-320
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• 2007

We researched basic study about electrical characteristics of Zinc Selenide (Faraday Cell), which is known for various temperature of good-performance, that applied measuring current or protecting instrument by Optical Current Transducer, on Gas Insulated Switchgear. Measuring System consists of VCSEL produced 850nm IR Laser, Pin Photo Diode made of GaAs surveyed as Optical Power Meter, and Optical Fibers specified Multi-mode. We observed optical output changes during measurement of currents increasing by 100[A] in range from 0[A] to 1,000[A] and set temperature condition increasing by $5[^{\circ}C]$ in a range from $30[^{\circ}C]\;to\;60[^{\circ}C]$.

• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1524-1526
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• 2005

This paper describes the measurement and analysis of the basic line constants in PLC(Power Line Communication) in the residential building. An apartment is considered as one of the conventional residences to get the line constants in this paper and Agilent 4263B LCR Meter is used to measure the detailed values each area and the specific results and the averaged analysis data are shown in the tables. The measured results no different from the calculated values with using conventional formula due to the line arrangement neglected factors, complex permittivity, and etc. Also, this paper describes many kinds of lines and wiring figures of domestic construction. Finally, it is utilized with the analyzed line characteristics in frequency domain as a planning reference of PLC.

• Proceedings of the KIPE Conference
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• 2010.11a
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• pp.304-305
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• 2010

전력선통신을 이용한 원격검침 시스템의 구축이 시범사업을 넘어 상용화 수준으로 확대되어가고 있으나 현재까지는 주로 주상변압기에서 댁내 수용가정간에 고속전력선 통신칩을 사용하여 셀 토폴로지형태로 100가구전후 원격검침망을 구성하였다. 지중구간의 전력선은 가공선로와는 많은 다른 통신채널 특징을 가지며 지중화된 구간은 대도시 밀집지역에 주로 시설되기 때문에 원격검침시스템 구성시 가공구간보다 경제적인 측면에서나 검침자동화 확산 측면에서나 좋은 효과를 볼 수 있다. 본 논문에서는 지중고압선을 경유하는 원격검침망의 모델을 설계하고 시범운영을 통해 성능을 시험하였다.

• Journal of Drive and Control
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• v.10 no.4
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• pp.29-33
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• 2013

Pneumatic system is widely applied in various industry because it have a many advantage(low cost, high safety, etc..). For design of pneumatic system, accurate flow measurement is required. In this study, compressible fluid flow measurement apparatus was designed and built. It uses an isothermal chamber that can approximate isothermal condition. Therefore, it can be measured for flow-rate using pressure response of isothermal chamber. As a result, this apparatus can be measured for sonic conductance and critical pressure ratio of pneumatic components and it required less time and energy than conventional flow meter. The effectiveness of the designed apparatus is proved by experimental result.

• Information Systems Review
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• v.7 no.1
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• pp.97-113
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• 2005

This paper designed and implemented(programmed) a comparative shopping agent that helps consumers to shop at on-line shopping malls over Internet. At offline stores, as consumers usually tell a sales clerk about a manufacturer, functions and price range of an item they want to purchase, the sales clerk will show the products or relevant catalogues. Then the consumer will compare functions, design and prices of the product and buy it with the lowest price. PriceMeter, a comparative shopping agent, introduced in this paper, is designed best geared to this consumers' buying behavior. Basically, as consumers enter a manufacturer's name, price, features and etc. at a search window, PriceMeter will search the web and provide a list of product informations such as features and prices that meet the search conditions. Consumers can see the information in either a form of catalogue or a printing format. As consumers click specific items to examine closely, it will show prices and information about shopping malls that sell the requested items. Clicking a 'Buy' icon, the consumers will be transferred to the right web page at the linked shopping mall. The emergence of the comparative shopping agent will expedite a consumer-centered retailing economy in the age of e-commerce. As consumers are provided with a better set of product and shopping mall information, they can make better purchasing decisions and gain more bargaining power shifted from manufacturers(sellers). The presentation of this comparative shopping agent is intended to promote the consumer-centered B2C e-commerce.