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최형일(H I CHOI) 한국정보과학회 1987 한국정보과학회 학술발표논문집 Vol.14 No.2
Fourier Descriptor 는 형태분석(shape analysis) 분야에서 널리 사용되어 왔다. 본 논문은 먼저 여러 형태의 Fourier Descriptor 들을 살펴 보고 관련된 문제점들을 지적하여 본다. 다음으로 주어진 물체의 closed boundary 를 물체의 위치, 동향(orientation), 그리고 크기에 관하여 표준화하는 방법을 제안하여 본다. 접근 방법은 첫째로 Orientation reference point 와 Partitioning vectors를 정의하고 그들 사이의 관계를 통하여 표준화 설계(normalizing scheme)가 유도된다. 이 방법은 boundary sequence 의 단계정보(phase information)을 잃지 않고, 주어진 sequence를 적절히 밀어 내는(proper shifting) 효과를 가져온다. 더우기 이 방법은 additive noise 에 대하여 든감한 장점이 있다.
최형일,맹주성,이도형 漢陽大學校 工學技術硏究所 2001 工學技術論文集 Vol.10 No.-
본 논문에서는 연속류 영역과 미끄럼류 영역의 유동을 수치계산하기 위한 혼합 비정렬격자 압력기반해법을 제안한다. 압축성 효과를 반영하는 수정된 SIMPLE법을 비정렬격자 격자점 중심법에 적용하였다. 대류항은 2차의 중앙차분법을 지연수정법으로 이산화 하였으며, 확산항은 2차 정화도의 유사 정렬격자 기법을 사용하였다. 또한, 혼합 비정렬격자에서 기억장소의 절약과 계산 효율을 저하여 모서리 자료구조와 격자점 중심법을 사용하였다. 연속류 영역 뿐 만 아니라, 미끄럼 유동의 벽면에서의 미끄럼 현상을 해석할 수 있도록 미끄럼 경계조건을 부과하였으며, 여기에는 널리 쓰이는 Maxwell 경계조건과 명에 의해 새로이 제안된 Langmuir 경계조건을 사용하였다. 제안된 수치기법을 이용하여 연속류 영역의 유동과 미끄럼류 영역의 유동에 대해 수치 계산을 수행하였으며, 본 기법의 정확도와 효율성을 입증하였다. This paper proposes a pressure based method to compute both continuum flow and slip flow on hybrid unstructured grids. The compressible version of SIMPLE algorithm is extended to unstructured grids. Convection terms are discretized using second order central differencing with deferred correction approach and diffusion terms by second-order structured grids analogy. This method also uses cell vertex scheme with edge based data structure in order for memory savings and computing efficiency for arbitrary grid topologies. As well as continuum flow, slip flows are solved by adopting slip boundary conditions, which are well known Maxwell condition and Langmuir condition recently proposed by Myong.(30) The flows in both continuum regime and slip flow regime are calculated using the above methodology, which shows that the proposed method is well-devised with respect to accuracy and efficiency.
최형일,정경훈 조선대학교 환경공해연구소 2000 環境公害硏究 Vol.16 No.1
This study investigates the measurement and analysis of aircraft noise around Kwang-ju airport the results were as follows: The Flights per day at the Kwangju Airport are about 20 for civilian passenger airliner and about 40 for military plane but since military planes have irregular flight schedules and frequency, their operation is flexible according to military operations and other conditions. The noise of airplane around the populated area of the Airport indicates a serious situation of around 85 WECPNL in Woosan-dong, Songdae-dong and Shinchon-dong. Noise levels are within the expected noise pollution limits in dukheung-dong, Chipyung-dong and Bonduk-dong. Airplane noise in the density populated areas is lower than 80 WECPNL, the expected the noise pollution levels, and that for military planes is higher than that of civilian passenger airliners by 10 WECPNL and that of Woosan district is the highest of the three districts. In general, the frequency spectrum of military planes is around the 1000~2000Hz band, compared to that of civilian passenger airliners and noise level is higher by over 20dB. This is why the sound of the military plane is much louder and sharper, and it occurs in the frequency band causing sensitive response upon being heard.
최형일,김준영,한재익,김하정 한국임상수의학회 2020 한국임상수의학회지 Vol.37 No.4
Cytauxzoonosis is caused by Cytauxzoon felis (C. felis) in wild and domestic cats. However, cytauxzoonosis is uncommon in Asia. Additionally, clinical reports of C. felis infection along with associated complications are rare. A seven-year-old neutered male Maine Coon cat was presented with acute dyspnea and lethargy despite the absence of a history of overseas travel. Mild regenerative anemia and autoagglutination were detected in hematological investigations. The parasitic and viral PCR assays revealed infection with C. felis and feline immunodeficiency virus (FIV). Thoracic radiographs showed pleural effusion with secondary bacterial infection. Ultimately, a diagnosis of infection-induced secondary immune-mediated hemolytic anemia (IMHA) and pyothorax was established. The cat was treated with a combination of atovaquone, prednisolone, and cyclosporine over 6 months and the final treatment was completed 8 months after initiation of therapy. This is the first report of its kind demonstrating successful management of feline IMHA and fatal pyothorax induced by FIV and C. felis in South Korea.
최형일,정경훈 조선대학교 환경연구소 2000 環境硏究 Vol.16 No.1
This study investigates the measurement and analysis of aircraft noise around Kwang-ju airport the results were as follows: The Flights per day at the Kwangju Airport are about 20 for civilian passenger airliner and about 40 for military plane but since military planes have irregular flight schedules and frequency, their operation is flexible according to military operations and other conditions. The noise of airplane around the populated area of the Airport indicates a serious situation of around 85 WECPNL in Woosan-dong, Songdae-dong and Shinchon-dong. Noise levels are within the expected noise pollution limits in dukheung-dong, Chipyung-dong and Bonduk-dong. Airplane noise in the density populated areas is lower than 80 WECPNL, the expected the noise pollution levels, and that for military planes higher than that of civilian passenger airliners by 10 WECPNL and that of Woosan district is the highest of the three districts. In general, the frequency spectrum of military planes is around the 1000∼2000㎐ band, compared to that of civilian passenger airliners and noise level is higher by over 20㏈. This is why the sound of the military plane is much louder and sharper, and it occurs in the frequency band causing sensitive response upon being heard.