Stator Current Processing –Based Technique for Bearing Damage Detection in Induction Motors

Won ?Pyo Hong,Chung-Sup Yoon,Dong-Hwa Kim 제어로봇시스템학회 2005 제어로봇시스템학회 국제학술대회 논문집 Vol.2005 No.6

전력계통에서의 초전도전력기기의 제어 및 운전

홍원표 大田産業大學校 1996 한밭대학교 논문집 Vol.13 No.0201

An image of future power system which has introduced superconducting generator, cable, transformer, fault current limiter, SMES and so on is presented. Conceptual designs of each SC Machines and devices are carried out. The SC cable and SFCL utilize the high Tc superconductor(HTS) cooled by liquid N_2-. Other devices use low temperature superconducting cooled by liquid He. The SC power system models are proposed detailedly. In viewpoint of the operation and control SC power system, the concrete design direction and effective role of each SC apparatus are investigated. In this paper, superconducting fault limiters(SFCLS) should play an important part of the quenching current level coordination to prevent the other SC devices from quenching. Finially, SFCL are also expected to be very effective to introduce flexibility of power system planning and operation due to their possibility to enhance transient stability and reduce short circuit current.

Carbon Black이 시멘트 Paste 및 Mortar의 물리적 특성에 미치는 영향

홍원표,황의환,조헌영 忠南大學校 産業技術硏究所 1986 산업기술연구논문집 Vol.1 No.2

This study was performed to determine the most desirable carbon black and it's content in ordinary porland cement for the increase of physical properties of the cement and mortar. The various contents of carbon black were used for this study such as 0.2wt%, 0.5wt%, 1.0wt% and 3.0wt%. The different particle size and structure of carbon black were used. The physical properties of the cement paste and mortar were tested by KS methods. The experimental results are as follow; 1) The contents of 0.5-1.0wt% carbon blacks in cement increased most apparently the setting time of cement paste, flow value, compressive and flexural strengths of mortar, whereas decreased the water absorption ratio of mortar by about 10%. 2) SNP and D company's carbon black which have smaller numbers of I₂adsorption and DBP absorption and heavier pour density than those of others showed to be the most effective carbon blacks. 3) The soundness of cements remained unchanged regardless to the different kinds and contents of carbon blacks.

NATM 통신구터널 지보패턴에 관한 연구

홍원표,한중근,이상곤 중앙대학교 기술과학연구소 1998 기술과학연구소 논문집 Vol.28 No.-

우리나라에서 NATM 통신구터널에 적용되고 있는 암반분류형태 및 지보패턴은 지하철 도시터널과 같이 대형단면 터널에 적용되는 기준을 그대로 적용하고 있는 실정이다. 그러나 NATM 통신구터널은 대개 소형단면터널이며 깊은 tal도에서 시공되는 것이 일반적이다. 따라서 NATM 통신구터널의 설계 및 시공시에는 적절한 지반암반의 정량화 및 공학적 분류법을 별도로 마련하여 이 분류에 근거한 적합한 지보모델을 제시할 필요가 있다. 본 연구에서는 NATM 통신터널에 적합한 표준지보패턴과 암반분류모델을 7등급으로 구분 제시하며 제시된 암반 분류등급별 지보패턴에 대한 합리성이 터널시공사례에 대한 유한차분해석을 통해 검증된다. The classification of rock-mass and its reinforcement pattern used for Communication Cable Vault in Korea have been actually used such methods that applied to largesectional tunnel construction such as Subway urban-tunneling. However, in the case of small sized tunnel works for Communication Cable Vault which are generally adopted at deep depth, the proper reinforcing support model should be suggested on the basis of quantitative classification of rock-mass for design and construction. This paper presented standard reinforcement pattern and classification model of rock-mass for NATM of Communication Cable Vault. They are divided in to 7-categories of grades and reasonability of these suggestion is ascertained from numerical analysis for the construction of these suggestion is ascertained from numerical analysis for the construction of Tunnel.

폭풍발생에 따른 해안단면변화에 관한 수치해석

표순보,조원철,이보형,이홍식 중앙대학교 기술과학연구소 1998 기술과학연구소 논문집 Vol.28 No.-

폭풍발생에 다른 해안단면의 변화를 예측하는 것은 해안선 변화에 대한 종합적인 대책을 수립하는데 있어 중요한 역할을 한다. 해안단면변화는 주로 해빈의 유사이송에 에 의해 발생되나, 유사이송은 유사의 입경, 수면상승높이, 쇄파고 등 많은 요소들에 의해 복합적으로 작용하기 때문에 현재에도 정확한 예측이 어려운 실정이다. 본 논문에서는 해안단면에서의 평형에너지소산개념을 수치모델에 도입하여 폭풍발생에 따른 안층방향의 해안단면변화와 해빈침식에 대하여 분석하여 보았다. 안층방향의 해안단면변화와 해빈침식은 평형단면 파라미터, 유사이송률 파라미터, 수면상승높이에 의해 크게 영향을 받음을 알 수 있다. A numerical model is applied for predicting variation of the beach profile and beach erosion during storms. Equation of sediment continuity and dynamic equation, governing on-offshore sediment transport due to a disequilibrium of wave energy dissipation, are used in the model. During a storm, the beach profile evolves to a form where the depth at the surf zone is related to the distance seaward of the waterline. In general, variation of the beach profile is found to be sensitive to the equilibrium profile parameter, the sediment transport rate parameter and the elevated water level. Also, the model response characteristics in the simulation of beach erosion show a lag between the maximum storm surge elevation and the maximum erosion.

韓國의 암발파 진동상수에 관한 연구

홍원표,엄영진,윤중만 중앙대학교 기술과학연구소 1995 기술과학연구소 논문집 Vol.25 No.-

암반지반에서 절토나 지하굴착을 실시할 때 암발파로 인해 진동과 소음이 발생하게 된다. 지반진동은 인접구조물에 손상을 주거나 인근주민에게 불쾌감을 주기 때문에 지반진동의 발생기구나 인접구조물에 영향을 미치는 매카니즘을 정확히 예측하는 것은 매우 중요하다. 따라서 본 연구의 목적은 지반진동에 대한 규준을 마련하는데 있다. 지반진동은 최대입자속도, 발파에너지, 진동원으로 부터의 거리에 영향을 받는 것으로 나타났다. 또한, 본 연구에서 산정된 진동식의 최대입자속도는 기존의 제안식보다 약간 작게 나타나고 있으나 진동원으로부터 50~100m 이내의 거리에서는 매우 유사하게 나타나고 있다. Vibration and noises are occured dut to rock blasting work for cutting and underground excavation performed in rock ground. It is very important to control the vibration produced according to rock blasting. Therefore, the main objective of this paper is to estabilish criteria of vibration to control blasting. Vibration is influnced by peck particle velocity, blasting energy, distance from vibration source and strength of rock. The peck particle velocities estimated by the vibration equations presented in this paper are lower than those estimated by existing empirical equations but both show very similar within distance from 50m to 100m.

근대성의 한국적 변용에 대한 정치공동체론적 비판

홍원표 한국외국어대학교 사회과학연구소 2001 社會科學論集 Vol.18 No.2

초전도고장전류제한기가 포함된 전력시스템에서 고장전류계산방법과 고장전류억제효과 분석

홍원표 大田産業大學校 1998 한밭대학교 논문집 Vol.15 No.1

Design & Operation of power system for meeting increase of electric power demand is becoming more difficult and complex. One of reasons is increase of fault current. As one of the most effective methods for suppressing the fault current, installation of SFCL is expected. This paper describes a method of fault analyses of power system with SFCLs, and also discusses determination of specification two-bus electric power system with single transmission lines

설비적인 관점에서 본 인텔리전트 빌딩의 화재위험과 방재계획

홍원표 大田産業大學校 1996 한밭대학교 논문집 Vol.13 No.1

This paper presents the essential points of fire risks and planning of fire protection of intelligent building (IBS) in viewpoint of architectual facility. The problems and cause of fire occurance in IBS is analysized. In near future, the most important facility configurations of IBS is composed of DDC (local controller), LAN for networking IBS. It is expected that emergency facilities and general equipments, plumbing, HVAC & electrical installation etc., are operated integratedly. Therefore, the standardization of H/W & S/W for communication in architectual facilities get accomplished for building amenity and reliability in near furure. This also discusses on the possibility of operation & planning of emergency facility system with DDC & LAN system and propose the high sensitive detection system for fire perfection and pressurized smoke protection system for IBS.

RMR등급에 따른 NATM터널 지보형식 설계

홍원표,장귀환 중앙대학교 기술과학연구소 1999 기술과학연구소 논문집 Vol.29 No.-

서울시 지하철의 NATM 터널 설계에 사용되고 있는 터널지보형식은 암의 단순한 분류에 의거하여 결정되고 있다. 이렇게 결정된 터널지보형식은 RMR분류에 의거하여 결정되는 터널지보형식에 비하여 비경제적이다. 따라서, 본 연구에서는 서울시 지하철 구간중 RMR등급에 의해 분류될 수 있는 3개의 사례현장을 대상으로 지하철 표준지보단면과 RMR등급에 따른 지보단면의 해석결과를 비교검토한다. 또한, 해석결과로부터 NATM터널 설계에 적용될 수 있는 탄성계수의 적정치가 검토된다. On design of NATM tunnels for subway in Seoul, the support system for tunnels is usually decided on the basis of simple rock classification. The support system based on the simple rock classification is more conservative than the support system decided on the basis of RMR classification. In this study, a comparison of analysis for three field cases of subway in Seoul is performed for both the conventional support system and the support system based on the RMR classification. Also, the suitable elastic modulus on design of NATM tunnels is investigated from the analytical results.