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독립형 태양광, 풍력, 소형발전기 복합시스템에서 안정적인 전력공급을 위한 컨트롤러에 관한 연구
최병수(Byoung-Soo Choi),김재철(Jae-Chul Kim) 한국조명·전기설비학회 2012 조명·전기설비학회논문지 Vol.26 No.4
The object of this paper is the controller for supplying stably power in a separate house in which a hybrid electrical storage system with a stand-alone photovoltaic/wind power generation system and a small generator is applied. In the photovoltaic/wind hybrid power system used in the separate house, when only the battery is used in sunless days, the capacity of the battery is become larger. In particular, as in recent days, if cloudy days are frequent due to anomaly climate, it is difficult to estimate the number of sunless days. Accordingly, it is preferable to build the electrical storage system that numbers of sunshineless days are to be controlled and a shortage amount of the power generation capacity is to be handled by a small generator system. In order to supply stably power of new renewable energy such as solar to any separate houses, it is preferable to reduce the capacity of battery by decreasing the number of sunless days when estimating the capacity of battery and to drive the small generator for compensation of the power shortage. Such system needs components including inverters for photovoltaic and wind power generation system, batteries and controllers for automatically driving the small generator, based upon the nature of the stand-alone house, and it is preferable to use the controller having a simpler and higher stability by adopting the all-in-one scheme to facilitate its maintenance.
독립형 태양광 풍력 복합발전 시스템에서 안정적인 전력공급을 위한 축전지 용량의 최적 산정에 관한 연구
최병수(Byoung-Soo Choi),김재철(Jae-Chul Kim) 한국조명·전기설비학회 2011 조명·전기설비학회논문지 Vol.25 No.9
The object of this paper is to optimize the battery system for supplying stably power in separate house in which a PV-wind hybrid power generation system is applied. In a power system to be used in a stand alone, it is very important to build optimize the electrical storage system and to utilize it for supplying stably output voltage when there is a shortage of the power generation capacity or there is no sunshine, or when power is to be supplied with a load. This paper provides an optimized method to evaluate capacity of battery by analyzing advantages and disadvantages of the existing battery evaluating method being used in each company for supplying stably power in separate house utilizing the new renewable energy such as a light of the sun.
부조일에 따른 독립형 태양광 풍력 복합발전 시스템에서 전기저장장치의 경제성에 관한 연구
최병수(Byoung-Soo Choi),김재철(Jae-Chul Kim) 한국조명·전기설비학회 2012 조명·전기설비학회논문지 Vol.26 No.3
This paper relates to a study on the economic of electrical storage device for supplying power in sunless days, in the stand alone PV/Wind hybrid system, which it is applied to separate houses. In a photovoltaic/wind hybrid power system used in a separate house, when only the battery is used in sunless days, the capacity of the battery is become larger. For example, as in recent days, if cloudy days are frequent due to anomaly climate, it is difficult to supply power stably by only the battery based upon pre-estimated sunless days. Accordingly, in order to supply stably power of new renewable energy such as solar to any separate houses, it is preferable to reduce the capacity of battery by decreasing the number of sunless days when estimating the capacity of battery and to drive the small generator for compensation of the power shortage.
화소 전류 보상 기법을 이용한 볼로미터 형의 비냉각형 적외선 이미지 센서
김상환 ( Sang-hwan Kim ),최병수 ( Byoung-soo Choi ),이지민 ( Jimin Lee ),오창우 ( Chang-woo Oh ),신장규 ( Jang-kyoo Shin ),박재현 ( Jae-hyoun Park ),이경일 ( Kyoung-il Lee ) 한국센서학회 2016 센서학회지 Vol.25 No.5
Recently, research on bolometer-type uncooled infrared image sensor which is made for industrial applications has been increasing. In general, it is difficult to calibrate fixed pattern noise (FPN) of bolometer array. In this paper, average-current calibration algorithm is presented for reducing bolometer resistance offset. A resistor which is produced by standard CMOS process, on the average, has a deviation. We compensate for deviation of each resistor using average-current calibration algorithm. The proposed algorithm has been implemented by a chip which is consisted of a bolometer pixel array, average current generators, current-to-voltage converters (IVCs), a digital-to-analog converter (DAC), and analog-to-digital converters (ADCs). These bolometer-resistor array and readout circuit were designed and manufactured by 0.35 μm standard CMOS process.
컬럼 커패시터와 피드백 구조를 이용한 CMOS 이미지 센서의 동작 범위 확장
이상권 ( Sang Gwon Lee ),조성현 ( Sung Hyun Jo ),배명한 ( Myung Han Bae ),최병수 ( Byoung Soo Choi ),김희동 ( Hee Dong Kim ),신은수 ( Eun Su Shin ),신장규 ( Jang Kyoo Shin ) 한국센서학회 2015 센서학회지 Vol.24 No.2
This paper presents a wide dynamic range complementary metal oxide semiconductor (CMOS) image sensor with column capacitor and feedback structure. The designed circuit has been fabricated by using 0.18im 1-poly 6-metal standard CMOS technology. This sensor has dual mode operation using combination of active pixel sensor (APS) and passive pixel sensor (PPS) structure. The proposed pixel operates in the APS mode for high-sensitivity in normal light intensity, while it operates in the PPS mode for low-sensitivity in high light intensity. The proposed PPS structure is consisted of a conventional PPS with column capacitor and feedback structure. The capacitance of column capacitor is changed by controlling the reference voltage using feedback structure. By using the proposed structure, it is possible to store more electric charge, which results in a wider dynamic range. The simulation and measurement results demonstrate wide dynamic range feature of the proposed PPS.
내장된 전송게이트를 가지는 Gate/Body-Tied PMOSFET 광 검출기의 모델링
이민호 ( Min Ho Lee ),조성현 ( Sung Hyun Jo ),배명한 ( Myung Han Bae ),최병수 ( Byoung Soo Choi ),최평 ( Pyung Choi ),신장규 ( Jang Kyoo Shin ) 한국센서학회 2014 센서학회지 Vol.23 No.4
In this paper, modeling of a gate/body-tied (GBT) PMOSFET photodetector with built-in transfer gate is performed. It can control the photocurrent with a high-sensitivity. The GBT photodetector is a hybrid device consisted of a MOSFET, a lateral BJT, and a vertical BJT. This device allows for amplifying the photocurrent gain by 103 due to the GBT structure. However, the operating parameters of this photodetector, including its photocurrent and transfer characteristics, were not known because modeling has not yet been performed. The sophisticated model of GBT photodetector using a process simulator is not compatible with circuit simulator. For this reason, we have performed SPICE modeling of the photodetector with reduced complexity using Cadence`s Spectre program. The proposed modeling has been demonstrated by measuring fabricated chip by using 0.35 im 2-poly 4-metal standard CMOS technology.
송재석,최병수,원종욱,노재훈 大韓産業醫學會 2000 대한직업환경의학회지 Vol.12 No.4
목적 : 소음 특수건강진단시 문진표의 유용성을 알기 위하여 실시되었다. 방법 : 자료로는 전국을 5대 권역으로 나눈 후 연구에 협조적인 산업보건기관을 대상으로 하여, 소음성 난청이 발생한 사업장과 그 부서에 대하여 정상인 근로자의 검진기록과 작업환경측정 기록 및 문진표를 수집하여 분석하였다. 결 과 : 각각의 문진 항목과 청력이상 여부에 대한 분석결과, 귀에서 소리가 난다고 하는 항목과 최근 작은 소리가 잘 안들린다고 하는 만성 특이적 항목만 청력이상 여부와 관계가 있었고, 급성 항목들은 청력 이상 여부와 통계적 연관성이 없었다. 또한 7개의 설문 항목과 연령 및 근무경력만을 이용하여 청력이상을 판정한다고 하였을 때, 실제 건강진단 결과와 비교하게 되면 민감도, 59 %, 특이도, 88 %로 계산 되었으며, 평균 23 %정도가 잘못 분류되었다. 결 론 : 만성적이고 특이적인 항목을 위주로 한 단순하고도 판별력있는 항목의 개발이 필요하며, 이러한 항목들을 전산화하였을 때, 효과적인 소음성 난청의 선별검사 체계를 구축할 수 있을 것이다. Objectives : This study was performed to investigate the effectiveness of the questionnaire. Methods : Workers'health examination records, work environment record, and questionnaires of selected industries as samples were analysed using logistic regression analysis and discrimination analysis Results'Cases of bearing impairment (Dl+C) as dependent variables, and age, work duration and level of environmental noise as independent variables were selected for multiple unconditional logistic regression analysis. Odds ratio was 4.04 in hearing difficulty, 2.78 in tlnnitus and 1.08 in age. In the second analysis Noise induced hearing loss is selected as dependent variable. The OR in hearing difficulty was 3.67(95 % C.1. : 1.61 8.61), and was 1.09(95 % C.1. : 1.05-1.14) in age. Conditionnal multlple logistic regression analysis was performed. In hearing impairment as dependent variable, the OR of age was 1.02(95 % C.1. : 1.00-1.04) and other variables were not significant. However, NIHL as dependent, the OR of hearing difficulty was 4.57(95 % C.1. : 1.43-14.67). According to multiple logistic regression adopting each items of questionnaire as dependent variable, the only item of hearing difficulty showed significant difference with hearing ability. The discrimination analysis was performed with the class variable of hearing impairment, and discrimination variables of age, work duration, and environment noise level. The sensitivity of 59 %, and specificity of 88 %, and average error count of 23 % were obtained. When the numbers of items answered in questionnaire were assumed as the parameter of judgement for noise induced hearing loss (NIHL), the highest sensitivity and specificity were 33.5% and 49.0% in cases of more than two items answered. Conclusions : The development of items that is simple and discriminative mainly consisted of chronic and specific diseases related items is needed. Computerization for newly developed items might be needed to establish effective surveillance system for NIHL in the future.