• 한국ITS학회:학술대회논문집
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• 2008.11a
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• pp.517-518
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• 2008

• Journal of Environmental Impact Assessment
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• v.6 no.2
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• pp.81-92
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• 1997

This paper presents the results from the comparison analysis and evaluation between the air pollutant dispersion modeling results and the observation data in the area within a 10 km radius from the Boryong thermal power plants. The observation data used in this study were the air pollutant concentrations which had been continuously measured from 8 locations around the Boryong power plants by TMS(tele-monitoring system) for 3 months from September to November, 1996. The short-term and long-term predictions were carried out using ISC3 model and LPDM(Lagrangian Panicle Dispersion Model). The results of ISC3 modeling in a short-term showed highly as 0.7 in a correlation coefficient, but in a long-term showed just 0.54. On the other hand, LPDM showed 0.78 in a correlation coefficient for a long-term, but in a short-term showed highly value than the observation concentrations.

• Journal of Environmental Science International
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• v.12 no.7
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• pp.809-816
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• 2003

The short-term version of Industrial Source Complex Model(ISCST3) was evaluated for estimating short-term concentrations using criteria pollutant(SO$_2$, NO$_2$, CO, PM10) data from emission inventory of Young Tong area in Suwon for the year 2002. The contribution of pollutant concentration from point, line, area sources was found 21.8, 76.5 and 1.6%. Statistical parameters, such as correlation coefficient, index of agreement(IA), normalized mean square error(NMSE) and fractional bias(FB) were calculated for each pollutants. The model performance were found good for PM10(82%) and NO$_2$(69%), but poor for SO$_2$(34%) and CO(13%).

• Transactions of the Korean Society of Automotive Engineers
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• v.5 no.5
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• pp.37-50
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• 1997

The objective of this paper is to study on the idle speed control using the fuzzy logic controller under load disturbance. The design procedure for fuzzy logic controller depends on the expert's knowledge or trial and error. The inputs of the fuzzy controller are error of rpm and variation of rpm. The output of the fuzzy controller is an ISC motor step and ignition timing. The airflow is controlled by the ISC motor movement and the idle speed is controlled by the airflow control and ignition timing control. During the control, air to fuel was checked by LAMBDA sensor. All experiments were performed in a real vehicle.

• Proceedings of the KSME Conference
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• 2000.04b
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• pp.879-885
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• 2000

This study is carried out to make clear the reason of occurrence of sudden acceleration incident of AT vehicle. The stepping motor is used to control the engine speed at idle by compensating the volume of air. By the way it's valve is contaminated by blow-by gas, deposit and back fire etc. This contamination could occur the load of motor at low temperature. This plays an important role in damaging the motor's coil with the motor's performance interfered. If it's coil is damaged the ISC could malfunction. If these phenomena occur, the speed of engine may increase or the engine may stall with hunting.

• 전기의세계
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• v.46 no.12
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• pp.18-22
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• 1997

우리 학회에서는 선진국과의 기술협력 강화, 국제적 입지의 향상, 국내 연구의 활성화 등의 취지로 1994년부터 ISAP 국제학술회의의 국내 유치를 추진하였으며 노력을 경주한 결과 1995년 12월 ISAP 국제운영위원회(ISC:International Steering Committee)로부터 유치 확정 통보를 받았다. 1996년 1월에 본 학회 이사회에서는 ISP'97 국제 학술회의를 학회 창립 50주년 기념행사의 일환으로 치를 것을 결정하였고 1996년 2월 ISAP'96 대회기간중 열린 ISC 회의에서 원래 '97년 8월중으로 예정된 개최일자를 '97년 7월로의 변경을 신청하여 승인하였다. ISP'97 국제학술회의에서는 창립 50주년 기념 국제학술회의로서의 의의를 높이고 많은 회원들의 참여를 유도하기 위하여 대회 주제의 범위를 전력시스템 분야만이 아니고 발전소, 전기기기, 원자력 등을 포함한 일반 전기공학의 모든 분야에 있어서의 지능형시스템 신기술 응용으로 확대하였다.

• ETRI Journal
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• v.36 no.4
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• pp.537-544
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• 2014

In this paper, we present a new inter-carrier interference (ICI) self-cancellation scheme - namely, ISC scheme - for orthogonal frequency-division multiplexing systems to reduce the ICI generated from phase noise (PHN) and residual frequency offset (RFO). The proposed scheme comprises a new ICI cancellation mapping (ICM) scheme at the transmitter and an appropriate method of combining the received signals at the receiver. In the proposed scheme, the transmitted signal is transformed into a real signal through the new ICM using the real property of the transmitted signal; the fast-varying PHN and RFO are estimated and compensated. Therefore, the ICI caused by fast-varying PHN and RFO is significantly suppressed. We also derive the carrier-to-interference power ratio (CIR) of the proposed scheme by using the symmetric conjugate property of the ICI weighting function and then compare it with those of conventional schemes. Through simulation results, we show that the proposed ISC scheme has a higher CIR and better bit error rate performance than the conventional schemes.

• Journal of Korean Society of Environmental Engineers
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• v.28 no.12
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• pp.1316-1322
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• 2006

The purpose of this study is to analyze the pattern distribution of the odorous compounds and air pollutants from the inventory sources in the Cheon-an second industrial complex. Twelve analysis including specified odor materials and air pollutants were concurrently measured during the month of August, 2005 to evalaute odor emission characterization in m3;or treatment facilities. Also, Concentration of air pollutants has been calculated by ISCST3 in ISC3 models. A Korean air diffusion modeling software, Air Master, was developed on a basis of diffusion theories adopted in U.S. EPA's ISC3 model to assess the air quality impact from the stacks. This investigation will be executed how large the complex pollutant sources such as industrial complex contribute to atmospheric environment and air quality of the surrounding the area as predicting by comparing and analyzing results of odorous compounds and air pollutants diffusion concentration model.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.41 no.7
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• pp.799-808
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• 2016

The IEEE 802.15.7r1 Task Group (TG7r1), known as the revision of the IEEE 802.15.7 Visible Light Communication standard targeting the commercial usage of visible light communication systems which mainly use either image sensors or cameras, is of interest in this paper. The vast challenge in Image Sensor Communications (ISC), as it has been addressed in the Technical Consideration Document (TCD) of the TG7r1, is the Image Sensor Compatibility to support the variety of different commercial cameras available on the market. The on-going ISC standard must adhere to compatible image sensors regulations. This paper brings an inside review of the TG7r1 and an inside look of related works on Image Sensor Communications. The paper analyzes the compatibility features by introducing a revised model of receiver to explain how those features are necessary. One of the most challenging but interesting features is the capability in being compatible to camera frame rates. The variation of camera frame rate is modeled from verified experimental results. Noticeably, three singular approaches to support frame rates compatibility, including temporal approach, spatial approach, and frequency-domain approach, are proposed on the paper along with concise definitions. Those schemes have been presented as valuable proposals on the call-for-proposal meeting series of the TG7r1 recently.

• Proceedings of the Materials Research Society of Korea Conference
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• 2011.05a
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• pp.44.1-44.1
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• 2011

본 연구에서는 태양전지 설계를 위해 기존의 반도체소자 simulation에 사용되고 있는 Silvaco TCAD tool을 사용하여 p+ boron emitter의 특성분석 실험을 하였다. 변수로는 emitter의 농도와 접촉저항 이 두 가지 놓고 표면 재결합과 의 영향을 염두에 두고 실험을 하였다. 농도는 $1{\times}10^{17}\;cm^{-3}$에서 $2{\times}10^{22}\;cm^{-3}$까지 두었고, 각각의 농도에 해당되는 contact 저항을 설정하여 전기적 특성을 보았다. 실험 결과 두 가지 변수를 모두 입력하였을 때 처음에 Isc가 조금씩 올라가다가 $1{\times}10^8\;cm^{-3}$에서 가장 높았고 그 이후에는 표면 재결합이 커지면서 Isc가 계속 떨어졌다. 하지만 contact 저항으로 인해 가장 높은 효율은 $1{\times}10^9\;cm^{-3}$ 부근에서 보였다. 농도에 따라 표면 재결합과 contact 저항이 서로 반대로 변하기 때문에 emitter를 표면 재결합이 늘어남에도 불구하고 contact 저항으로 인해 비교적 고농도로 doping 해야만 했다. 하지만 우리가 준 contact 저항은 농도에 따라 생긴 저항으로 실제 전극의 contact 저항은 훨씬 더 클 것으로 예상되고 이로 인해 더 고농도의 doping이 필요하게 된다. 그렇게 된다면 표면의 재결합으로 인한 손실은 더 크게 되어 전체적으로 효율은 떨어진다. 우리는 이 손실을 보완하고 줄이기 위해 selective emitter 개념을 넣어 이에 대한 영향은 보았다. selective를 하지 않은 $1{\times}10^{19}\;cm^{-3}$의 doping 농도의 가장 높은 효율을 보인 기존의 emitter와 전극 부분을 제외한 표면은 $1{\times}10^{18}\;cm^{-3}$으로 하고 전극 부분의 emitter는 $2{\times}10^{20}\;cm^{-3}$으로 한 selective emitter를 비교해보았다. 이는 selective emitter가 기존 emitter에 비해 Isc와 Fill Factor로 인해 효율이 약 0.7% 정도 높았다.