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양극산화에 의해 CP Ti와 Ti-10Ta-10Nb 합금 표면에 형성된 산화 피막의 형상 및 표면 특성
김현승,이광민,이도재,박상원,이경구,Kim, Hyun-Seung,Kee, Kwang-Min,Lee, Doh-Jae,Park, Sang-Won,Lee, Kyung-Ku 한국재료학회 2007 한국재료학회지 Vol.17 No.1
In the present study, we investigated the formation of self-organized nanostructure oxide layers on CP Ti and Ti-10Ta-10Nb alloy in an electrolyte of 1M phosphoric acid and 1.5 wt% Hydrofluoric acid. The morphology of oxide film on substrate was observed using scanning electron microscopy and transmission electron microscopy The surface roughness of titanium oxide film was analyzed by atomic force microscopy and the crystalline of specimen was investigated using X-ray diffractometer. The results of this study showed that well-aligned titanium oxide nanotubes are formed with diameter of approx. 100nm and length of approx. 500nm with CP Ti. However, it is clear that TiTaNb alloy highly irregular structure with various diameters. Transmission electron microscope investigations show that the specimens were confirmed as amorphous. Such titanium oxide nanotubes are expected a well-adhered bioacitive surface layer on titanium substrate for orthopedics and dental implants.
Guillain-Barre 증후군과 뇌경색 양상을 보인 신경정신 루푸스
김현승 ( Hyun Seung Kim ),이승찬 ( Seung Chan Lee ),홍현일 ( Hyun Il Hong ),한군희 ( Koon Hee Han ),이순금 ( Soon Keum Lee ),김성수 ( Sung Soo Kim ) 대한류마티스학회 2004 대한류마티스학회지 Vol.11 No.4
Systemic lupus erythematosus (SLE) is a disease of unknown etiology in which tissues and cells damaged by pathogenic autoantibodies and immune complexes. Nervous system involvement in patients with SLE encompasses a wide spectrum of neurologic and psychiatric features and the frequency of neuropsychiatric manifestations has been estimated at around 25% to 70%. American College of Rheumatology Ad Hoc Committee on neuropsychiatric lupus nomenclature developed case definitions for 19 different neuropsychiatric manifestations observed in SLE in 1999. Among them, Guillain-Barre syndrome and cerebral infarction are very rare neuropsychiatric manifestation. We experienced a 28-year-old woman with neuropsychiatric lupus which presented as Guillain-Barre syndrome and cerebral infarction. She was recovered after treatment with intravenous immunoglobulin, high dose methylprednisolone, cyclophosphamide and anticoagulants.
LDPC Codes에서 PEG 알고리듬과 IPEG 알고리듬의 성능 비교 평가 및 분석
김현승(Hyun-Seung Kim),고재현(Jae-Hyun Ko),장민(Min Jang),김상효(Sang-Hyo Kim) 한국방송·미디어공학회 2009 한국방송공학회 학술발표대회 논문집 Vol.2009 No.11
1962년 R.G Gallager가 제안한 LDPC(Low Density Parity Check)부호는 Shannon의 채널 용량의 한계에 근접한 우수한 오류정정 부호이다. 우수한 LDPC부호 생성 조건 중 가장 중요한 부분은 바로 최소 사이클 길이(girth) 를 최대화 하는 과정인데, PEG(Progressive Edge Growth)알고리듬은 이 조건을 만족시키는 우수한 알고리듬으로 인정받고 있다. 이후 높은 SNR범위에서 PEG알고리듬의 성능을 개선한 IPEG (Improved PEG) 알고리듬을 포함한 다양한 알고리듬이 제안 되었다.본 논문은 PEG와 IPEG 알고리듬을 이용해 생성한 LDPC 부호를 이용하여 부호길이, 부호율을 변화시키면서 실험하여 그 결과를 비교 분석하였고, 더 좋은 성능을 가질 수 있는 알고리듬에 대해 논의한다.
김현승(Hyeon-seung Kim),최종현(Jong-hyun Choi),이상진(Sang-jin Lee) 한국정보보호학회 2016 정보보호학회논문지 Vol.26 No.4
스마트폰이 널리 보급됨에 따라 누구나 쉽게 사진과 동영상을 촬영하고 배포할 수 있는 시대가 되었다. 개인이 스마트폰으로 촬영한 동영상은 중요한 수사 단서나 증거로 활용되고 이때 동영상이 특정 스마트폰으로 촬영되었음을 입증해야 하는 상황이 발생한다. 이를 위해 기존 연구들에서 제시한 다양한 방식의 fingerprint 기법을 활용할 수 있다. 하지만 fingerprint 기법을 사용한 결과의 신빙성을 보강해야 하거나 그 기법을 활용할 수 없는 상황들이 존재한다. 따라서 fingerprint 기법의 사용 이전에 스마트폰 포렌식 조사가 선행되어야 하고, 동영상 파일의 메타데이터 정보를 정리한 데이터베이스를 구축할 필요가 있다. 본 논문에서는 동영상 촬영이 스마트폰에 남기는 아티팩트와 상기한 데이터베이스에 대해 설명하고자 한다. As smartphones become more common, anybody can take pictures and record videos easily nowadays. Video files taken from smartphones can be used as important clues and evidence. While you analyze video files taken from smartphones, there are some occasions where you need to prove that a video file was recorded by a specific smartphone. To do this, you can utilize various fingerprint techniques mentioned in existing research. But you might face the situation where you have to strengthen the result of fingerprinting or fingerprint technique can’t be used. Therefore forensic investigation of the smartphone must be done before fingerprinting and the database of metadata of video files should be established. The artifacts in a smartphone after video recording and the database mentioned above are discussed in this paper.
김현승(Hyun-Seung Kim),박상섭(Sang-Sup Park),유창경(Chang-Kyung Ryoo) 한국항공우주학회 2015 韓國航空宇宙學會誌 Vol.43 No.8
본 논문에서는 기동하는 표적에 대한 입사각 제어 유도법칙을 제안하였다. 제안된 유도법칙은 정지표적에 대한 최적입사각제어 유도법칙을 변형한 것으로서 기존의 PN(Proportional Navigation) 유도법칙에 입사각제어 항이 추가된 바이어스 PN 유도법칙의 형태를 갖는다. 시선각, 비행경로각, 그리고 표적에 대한 상대 비행경로각 관점에서의 세 가지 다른 종류의 입사각을 정의하였다. 다양한 공대공 교전 시나리오에 대한 수치 시뮬레이션을 통해 제안한 유도법칙의 성능을 검증하였다. In this paper, a guidance law for intercepting maneuvering target with a desired impact angle is proposed. The proposed guidance law is modified from the optimal impact angle control law for a fixed target and given by a biased PN law with the impact angle control term in addition to the conventional PN law. Three different kinds of desired impact angles in the respect of LOS angle, flight path angle, and relative flight path angle to the target are defined. The performance of the proposed guidance law is investigated via numerical simulations for various air-to-air engagement scenarios.
김현승(Hyun Seung Kim),조준성(Jun Sung Jo),김현성(Hyeon Seong Kim),임효혁(Hyo Hyuc Im) 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-
From the research which it sees as the expression standard against the seabed terrain which the tsunami passes first after deciding the space grid size which is appropriate, it will reach and it used and the numerical model it established. And it used the numerical model established then it carried out the understanding of the characteristic for the past tsunami propagation which occurred from the East China Sea. After all there is the virtual tsunami against the earthquake which is possible and then the effect which is evaluated for the south coast of the Korean Peninsula.
김현승(Hyun Seung Kim),권혁문(Hyuck Moon Kwon),장양수(Yang Soo Jang),임상욱(Sang Uk Lim),남문석(Moon Suk Nam) 대한내과학회 1991 대한내과학회지 Vol.41 No.3
N/A 201 Thallium chloride has been described by Cox, Salvatore, Tonami as a positive indicator for lung neoplasm 201 Thallium scintiscan was performed in 10 patients with lung cancer and in 21 patients with benign lung diseases. Early scan demonstrated abnormal accumulation in 9 of 10 lung cancer and in 8 of,.,1 benign conditions(P=0.0066) and revealed strong positive uptake in all of 4 adenocarcinoma. Eight of twenty one benign conditions (4 in 8 active or cavitary pulmonary tuberculosis, 1 in 5 inactive pulmonary tuberculosis and 3 in 8 pneumonia or lung abscess) showed abnormal accumulation of 201Tl. And the fading apperance of radioactivity on some delayed scans was noted in benign conditions compared with persistent high radioactivity in lung cancer. 201Thallium scintiscan is useful in the differentiation of a pulmonary lesion whether is benign or malignant.