• Proceedings of the Korean Geotechical Society Conference
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• 1992.03a
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• pp.103-114
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• 1992

The jointing method of PC pile installation, which utilizes steel sleeve, is most popular for the deep bearing stratum( deeper than 15m ) or the irregular bearing stratum depths. However, this method has some difficulties in safety because there is no optimum standards of steel sleeve. This research attempts to determine the optimum standard of steel sleeve for 350mm PC pile, which is most widely used, through bending moment test designated by KS and numerical analysis using finite element method. According to the results, the optimum length of steel sleeve is three times longer than diameter of pile, and the thickness of steel sleeve is more than 2.5mm.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.26 no.2
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• pp.61-70
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• 2012

Recently due to the increasing of the importance on the green energy is getting higher by implementing EERS(Energy Efficiency Resource Standards) and NA(Negotiated Agreement) such as lacks of natural resources and The United Nations Framework Convention on Climate Change. And the most practical solution is CHP(Combined Heat and Power) which performs the best energy efficiency. This paper developed optimal operation mechanism of CES(Community Energy System) for enhancement of energy efficiency using CHP(Combined Heat and Power), PLB(Peak Load Boiler) and ACC(ACCumulator) capacities. This method optimally operated these capacities calculated the maximum profits by Dynamic Programing. Through the case studies, it is verified that the proposed algorithm of can evaluate availability.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.28 no.10
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• pp.43-48
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• 2014

With the energy paradigm shift from supply side management to demand side management, many researches have been done on demand side resource management and demand response. At the same time, Obix, BacNet-WS and OPC-UA are popularly used in buildings and industry energy management system. However, it is not easy to interchange the data and information among the systems cause a variety of protocols are used in buildings and factories. Therefore, in this paper, we are proposing an open business platform not only to integrate and manage the demand resources using various protocols and standards, but also to allow to plug-ins a new business service on top of the platform.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.26 no.8
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• pp.42-49
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• 2012

Grid-connected photovoltaic generator system requires high performance PCS(Power Conditioning System) according to the standard of 'Distributed Generation Grid-Connected Technology Standards'. This paper presents the MPPT control method which improves output efficiency through fast tracking to the maximum power point of PV and a reduced self-excited vibration. Secondly, in this paper DVR function was applied to PCS to compensate the voltage sag frequently happening for a power system. The proposed PCS control is analyzed and compared to conventional PCS operating characteristic, the various insolation and loads, and voltage sag condition through PSIM tool. It proves the utility.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.27 no.6
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• pp.82-87
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• 2013

Electrical leakage happens when faults in electrical apparatus or power lines occur. It causes electrical fires and electric shocks. In order to reduce accidents caused by electrical leakage current, it is important to detect faults effectively and shut off the power. In this paper, firstly we analyzed statistics of electrical fires and electric shocks caused by electrical leakage current. Secondly, standards of allowable leakage current and body impedance models were analyzed. Lastly, effective application methods for breaking electrical leakage current were suggested. The results will provide useful preventive measures of electrical fires and electric shocks caused by electrical leakage.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2007.05a
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• pp.105-108
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• 2007

Because of energy efficiency and environment-friendly characteristics, demands of white LED are being increased in various fields. White LED is being observed as next-generation light sources to alternate incandescent and fluorescent lamps so that the studies on white LED are being processed continuously. This study investigates technical developments and market movements of white LED to evaluate technical characteristics and to analyze performances data by comparing prototypes of white LEDs. And comparing efficiency of white LED with that of incandescent and fluorescent lamps, this study aimed at presentation of compatible standards for future LEDs.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.29 no.12
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• pp.15-21
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• 2015

We proposed 50W-LED modules of using Heat-pipe and Stack-fin and produced LED modules was evaluated heat dissipation characteristics with comparison of the conventional die-casting type. It verified the application of products by applying it to 150W-LED road luminaires through simulation. The LED module was measures aimed design temperature of the Stack-fin and showed 26% upward heat dissipation effect than a conventional die-casting type. The luminous efficacy of 150W-LED road luminaires using this LED module reached over 112lm/W, and the simulation results showed average of horizontal luminance, overall luminance uniformity($U_O$) and lane luminance uniformity($U_I$) that is suitable for five-lane road with the KS standards.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2009.05a
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• pp.428-431
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• 2009

KPX sets up the voltage standards according to the voltage level to supply a good quality of electricity to customers. Supply voltages are divided into 4 levels - 345kV, 154kV, 22.9kV, and distribution voltage consisting of 110, 220 and 380V. In this research, we examine the optimal voltage operating level focused on 154kV system that mostly affects electricity quality, through analysing the system demand.

• Journal of the Korea Society of Computer and Information
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• v.1 no.1
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• pp.65-82
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• 1996

The assurance of software product. which Is different to other products. is very complex because of Its characteristics. The use of objective development standards or guidelines and the confirmation to meet user's requirements are Important to achieve the software quality system. Moreover correct understanding of qualitv standards and continuous applications of check-points for qualify audit are necessary. ISO 9000 series. which are International standards. were made for the qualify assurance. Among them. ISO 9000-3 is the quality management and quality assurance standards for applying ISO 9001 to the design. development. supply. installation and maintenance of software. The newly revised ISO/CD 9000-3：1995 contains a lot of enforced changes within ISO 9001 framework - quality standards for manufactured products. This paper analyses the revised ISO 9000-3 by comparing it to ISO 9001. and derives quality audit points to use for qualify audit In future.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2004.11a
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• pp.267-273
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• 2004

It's a general tendency that electrical facilities of power station become a large size and increase in number because electrical facilities become big and complicated with internal industrial development and economic growth. So, electrical accidents were increased in this electrical facilities of power station. Therefore, we studied on the safety environment in power station and compared of internal and external standards. So this paper gives information which is applied to install the electrical facilities and prevents measures against electrical accidents.