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김창석,박순철,김대수,이상조 대한전자공학회 1994 전자공학회논문지-B Vol.b31 No.8
We proposed so-called AFHR (adaptable fuzzy hyper-resolution principle) that can manipulate uncertain knowledge and tune the range of resolution. The AFHR can make a rangable resolution to execute an efficient resolution and can represent linguistic truth values. In this paper, we introduce new concepts of law of contrary, meaningless range level for truth values and strict degree of adaptable resolution. We show that the differences of AFHR and existing fuzzy resolution. Finally we prove completeness of AFHR.
DCT와 Zonal coding 을 이용한 영상신호 압축에 관한 연구
金長源,金昌錫 明知大學校 産業技術硏究所 1992 産業技術硏究所論文集 Vol.11 No.-
In this paper, an image compression performance is improved by applying the zonal coding to the discrete cosine transformation which can reduce redundant elements of harmonics when original image is transformed to frequency domain from time domain. In order to reduce the number of computation, original image is segmented to serveral sub-blocks. In order to assure this method, a jaguar or a girl image of IEEE standard image is used in this experiment. The result of comperision of MSE of girl with MSE of jaguar, the reconstruction ratio of a girl image is good that the change of the pixel is not faster as like a girl image. In order to reduce the number of computation, 256×256 image is devided to 8×8 sub-image os that the number of computation is ?? from ??.
김창석 동국대학교 WISE(와이즈)캠퍼스 신라문화연구소 2009 新羅文化 Vol.34 No.-
백제는 관산성 전투에서 聖王이 敗死한 후 그 설욕을 위해 부심했다. 6세기 중엽까지 성왕을 추모하면서 군사력을 재정비하고, 567년부터 대외적인 외교ㆍ군사 활동을 다시 벌이기 시작했다. 北朝와 교섭하여 高句麗를 견제하면서 신라의 上州 지역을 공격했다. 武王이 즉위하면서 신라에 대한 공세를 본격화 한다. 下州와 新州를 번갈아 공략하여 신라와의 戰線을 확대했고, 624년에는 드디어 소백산맥을 돌파하여 그 동쪽으로 진격했다. 무왕 말년부터는 下州에 공격을 집중하여, 신라의 방어선을 차례로 무너뜨리고 642년에 大耶城을 점령했다. 대야성이 있는 합천 지역은 하주의 치소가 설치되어 大加耶의 故地를 다스리던 정치ㆍ군사적 요충지였다. 백제군은 城主인 金品釋과 그 부인을 처단하여 관산성 패전의 치욕을 철저히 씻었다. 신라로서는 대야성의 함락으로 王都까지 위험에 처했으며, 이를 수복하기 위해 적극적으로 외교 활동을 벌이고 군사 공격을 감행했다. 그러나 백제의 방어는 견고했으며, 백제 멸망 후인 661년에야 대야성을 되찾을 수 있었다.
김창석 동국대학교 WISE(와이즈)캠퍼스 신라문화연구소 2015 新羅文化 Vol.46 No.-
Chuncheon area was scarcely populated, and sedentism was not actively kept in the Neolithic Age. In the late Neolithic Age, approximately 10 groups were scattered out, with little chance to build regular relationship with each other. The Bronze Era saw the increased number of hamlets, with some established at new places. Their scale expanded to approximately 20~70 residences, which means that ‘hamlet’ in a strict sense was created. The process through which ancient states were established in Korea follows the developmental system from dwelling, through hamlet(聚落), group of hamlets(聚落群), village(邑落), town(小國), finally to ancient state. At a recently excavated site of Lego Land in Jung-do(中島) Island, Chuncheon, around twenty groups of hamlets were found. Hierarchy was observed between hamlets or groups of hamlets. The central hamlet of relics at the site of Lego Land was surrounded by a moat. The relics in Cheonjeon-ri(泉田里) were a complex consisting of residence, farmland and tomb. These two sites were 2 prominent forces considered to be weakly affiliated with the surrounding polities and groups of hamlets. From relics between the 2nd century B.C. and the 3rd century A.D., some evidence of Iron-Age culture influx was detected, and residential places in the Proto-Three Kingdoms Period and earthen vessels in Lelang Commandery type were found. This place was governed by Lelang Commandery. The main force in Chuncheon area at this time is supposed to be around Udu-dong(牛頭洞). The existence of a head of a local polity can be presupposed; the polity might have been grown enough to negotiate independently with Baekje in the middle of the 3rd century. At this time, it seems that the dominating power grew big and strong enough to control the surrounding groups of hamlets and develop to the level of a village, but it did not dominate all the surrounding polities, only forming an amicable league with them.
直流電動機 制御를 爲한 MOSFET를 使用한 PWM DC Chopper에 관한 硏究
김창석,송찬일,김병인 조선대학교 생산기술연구소 1990 生産技術硏究 Vol.12 No.2
This Paper describes the improvement of the operational characteristics which appear in the course of speed Control of DC Motor by PWM Chopper using power MOSFET. The use of low-pass filter to output brings about the improvement of operational Characterististics of motor speed Control, which is due to the reduction of the harmonic and ripple of the motor load Current. By increasing Chopper circuit frequency and the range of duty ratio, the speed characteristics of motor are almost linearly changed and Control range can be expanded.
김창석,최갑석 대한전자공학회 1984 전자공학회지 Vol.21 No.1
본 논문에서는 저역 통과 특성을 나타내는 것으로 알려져 있는 이동 평균 여파기의 마이크로프로세서 구성에 대한 실제적이고 간단한 기법을 연구한 것이다. 설계의 편의를 위하여 이동 평균 여파기에 대한 차단 주파수의 근사식과 필터링 알고리즘도 제시하였다. 상용 마이크로프로세서 Z-80을 사용한 실험 시스템의 몇 가지 실험결과를 제시했다. 고주파 잡음이 효과적으로 제거된 것이 확인되었으며 차단 주설수의 근사식의 결과는 실측결과와 거의 일치됨이 확인되었다. In this paper, a practical and simple scheme is described for the implementation of a moving average filter which is known to be able to provide low pass filter characteristics, and the estimated cut off frequency formulation of the filter and filtering algorithm are presented for the filter design. Some results of an experimental system using the commerical Z-80 microprocessor are given. It shown that high frequency noises are canceled effectively in frequency domain and time domain experiments and that results of the estimated cut off frequency formular is compared with measured one.