• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 하계학술대회 논문집 C
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• pp.1146-1148
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• 1995

To improve the breakdown characteristics of vertical power devices, field limiting ring(FLR) is popularly used. In this paper, at vertical power device having $300{\sim}600V$ breakdown voltage, FLR thecnique is considered, by two dimensional computer simulator, with the various of parameters; number of FLR, seperation distance of first FLR from the main juncton and second FLR from the first FLR, doping concentration and thickness of epi-layer, etc.. Below $40{\mu}m$ epi thickness, and for the case of one FLR, the maximum breakdown voltage, 580V is obtained.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제52권6호
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• pp.257-260
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• 2003

We have proposed the junction termination structure of IGBT (Insulated Gate Bipolar Transistor) by employing trench and FLR (Field Limiting Ring), which decrease the junction termination area at the same breakdown voltage. Our proposed junction termination structure, trench FLR is verified by numerical simulator MEDICI. In 600V rated device, the junction termination area is decreased 20% compared with that of the conventional FLR structure. The breakdown voltage of trench FLR with 4 trenches is 768 V, 99 % of ideal parallel-plane junction(1-D) $BV_ceo$.

• 자원ㆍ환경경제연구
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• 제26권2호
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• pp.139-172
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• 2017

본 연구는 국제원자력기구(International Atomic Energy Agency: IAEA)의 원자로정보시스템(Power Reactor Information System: PRIS)에서 제공하는 원자로 운전실적지표를 이용하여 원전의 안전성에 미치는 기술적 비기술적 요인의 역할을 분석한다. 이를 위해 안전성의 척도로 원전의 고장정지에 따른 발전손실률 (FLR: forced loss rate)을 사용했다. 1970년부터 2015년까지 전 세계에서 운영된 모든 원전으로 구성된 패널자료를 통해 분석한 결과, 기존 연구와 마찬가지로 원전의 전반적인 기술수준과 정비기술수준이 향상될수록 FLR이 하락하는 사실을 확인했다. 하지만 1986년 체르노빌 원전 사고 이후 기술적 요인이 통제된 FLR은 유의적으로 상승했다. 이는 원자력발전사업자가 체르노빌 사고 이후 원자력안전을 위해 보다 많은 기회비용을 지불하고 있다고 해석된다.

• 응용통계연구
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• 제29권6호
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• pp.1147-1154
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• 2016

본 연구에서는 다중 변화점 탐색과 관련하여 최근 많은 관심을 받고 있는 ${\ell}_0$-벌점 최소제곱법과 fused-라쏘-회귀(fused lasso regression; FLR)방법을 모의 실험을 통하여 비교하였다. 모의 실험의 결과로 FLR방법은 비-변화점을 변화점으로 잘못 탐색하는 경향이 ${\ell}_0$-벌점 최소제곱법과 비교할 때 상대적으로 높게 나타났으며 ${\ell}_0$-벌점 최소제곱법이 전반적으로 FLR방법에 비하여 좋은 성능을 보였다. 더불어 ${\ell}_0$-벌점 최소제곱법은 동적프로그래밍을 통하여 FLR 방법과 유사하게 효율적인 계산이 가능하다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 D
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• pp.1686-1688
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• 1999

The FLR(Field Limiting Ring) structure with a buried ring is proposed to improve breakdown voltage. The breakdown characteristics of proposed structure is verified by two-dimensional device simulator. ATLAS. It has shown that the breakdown voltage of the proposed structure is increased by 11 % compared with that of the FLR.

• 대한한의학방제학회지
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• 제29권3호
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• pp.119-125
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• 2021

Obejectives : The purpose of this study is to find out the efficacy of pacemaker potentials of interstitial Cells of Cajal (ICC) by Fermented Lotus Root (FLR) in small intestine. Methods : Enzyme digestions were used to separate the ICC. Using electrophysiological methods, pacemaker potentials were measured and intestinal transit rates (ITR) experiments were conducted to identify in vivo gastrointestinal motility. Results : 1. FLR (0.5-10 mg/ml) caused membrane depolarization by electrophysiological methods. 2. In the case of pretreatment with a Ca²⁺ free solution and thapsigargin, the pacemaker potential disappeared and in this case, FLR did not have a membrane depolarization reaction. 3. Lowering the concentration of extracellular Na⁺ concentration stoped the pacemaker potentials and inhibited the reaction caused by FLR. Flufenamic acid also inhibited the reaction by FLR. 4. In mice, ITR was increased by FLR. Conclusions : This study shows that FLR can control ICC by an internal/external Ca²⁺ and Na⁺. It also shows that FLR can be a good candidate for gastrointestinal motility medication development.

• Earthquakes and Structures
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• 제24권6호
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• pp.429-437
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• 2023

This paper studied the prediction of structural damage indices to buildings after earthquake occurrence using Multiple Linear Regression (MLR) and Fuzzy Linear Regression (FLR) methods. Particularly, the structural damage degree, represented by the Maximum Inter Story Drift Ratio (MISDR), is an essential factor that ensures the safety of the building. Thus, the seismic response of a steel building was evaluated, utilizing 65 seismic accelerograms as input signals. Among the several response quantities, the focus is on the MISDR, which expresses the postseismic damage status. Using MLR and FLR methods and comparing the outputs with the corresponding evaluated by nonlinear dynamic analyses, it was concluded that the FLR method had the most accurate prediction results in contrast to the MLR method. A blind prediction applying a set of another 10 artificial accelerograms also examined the model's effectiveness. The results revealed that the use of the FLR method had the smallest average percentage error level for every set of applied accelerograms, and thus it is a suitable modeling tool in earthquake engineering.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1999년도 전력전자학술대회 논문집
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• pp.469-471
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• 1999

In this paper, the method of Space-Vector Pulse Width Modulation(SVPWM) with Fuzzy Logic Regulator(FLR) is proposed. In a conventional SVPWM, the procedures of phase transformation and choosing PWM patterns are complex. So, it should be implemented with high performance processor like Digital Signal Processor(DSP). In order to reduce a calculation burden, a proposed system adopts FLR. Using a linguistic contro strategy based on expert knowledge, FLR relieves the processor from a heavy computations. In simulations, the proposed system is validated.

• 전자공학회논문지A
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• 제31A권7호
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• pp.95-101
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• 1994

A novel concept for the analysis of planar devices with a field limiting ring(FLR) is presented which allows analytic expressions in a normalized form for the potential distributions of FLR structure. Based on the method of image charges the main and ring junctions with identical cylindrical edges are kept to be two different equipotential surfaces. The potential relations between main and ring junction of the FLR structure are compared with 2-dimensional device simulation program. MEDICI. A good accordance is found. Comparisions with experimental data reported for the optimum ring spacing and the relative improvement of the breakdowm voltages in the FLR sturcture show the validity of the concept. The normalized expressions allow a universal application regardless to the junction depths and background doping levels.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제53권6호
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• pp.300-304
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• 2004

We have proposed the junction termination design employing shallow trench filled with silicon dioxide and field limiting ring (FLR). We have designed trenches between P+ FLRs to decrease the junction termination radius without sacrificing the breakdown voltage characteristics. We have successfully fabricated and measured improved breakdown voltage characteristics of the Proposed device for 1200 V-class applications. The junction termination radius of the proposed device has decreased by 15%-21% compared with that of the conventional FLR at the identical breakdown voltage. The junction termination area of the proposed device has decreased by 37.5% compared with that of the conventional FLR. The breakdown voltage of the proposed device employing 7 trenches was 1156 V, which was 80% of the ideal parallel-plane .junction breakdown voltage.