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차성철,김대성,최훈,손상욱,배현덕 충북대학교 컴퓨터정보통신 연구소 2004 컴퓨터정보통신연구 Vol.12 No.2
디지털 워터마크는 디지털 자료를 모사로부터 보호하는 방법이다. 그르므로 디지털 워터마크는 파일변환, 컬러변환, 약간의 몽롱화, 압축과 같은 치리에서 뿐 아니라 인쇄, 복사, 스캐닝에 대해서도 강인해야한다. 본 논문은 워터마크 추출을 위한 키 데이터와 독립성분분석을 이용하는 알고리즘을 제안한다. 이 기법에서는 워터마크는 사람의 눈에 덜 민감한 원 영상의 웨이블릿변환 계수에 삽입된다. 그리고 독립성분분석 알고리즘은 서로 확률 분포가 다른 워터마크와 계수를 분리한다. 실험결과 워터마크가 워터마크 영상에서 사람 눈으로 인지할 수 없음을 보였으며, 워터마크 영상으로부터 키 데이터를 이용 영상이 일부 제거된 경우, 잡음이 첨가된 경우, JPEG 압축에서 워터마크의 추출이 가능함을 보였다. A digital watermark is a method to protect digital material from counterfeit. Therefore, it must be robust to withstand any processing, such as file format conversions, color conversions, slight blurring, sharpening color adjustment and compression as well as printing, copying and scanning. This paper proposed a method using key data and ICA algorithm for extraction of watermark. In this Method, we embed the watermark to the wavelet transform coefficients of original image which located in less sensitive subband to human eyes. ICA algorithm separated between watermark and coefficient that differs with probability distribution function each other. The experiment results have shown that the watermark is invisible to human eyes in watermarked image, and it is possible for watermarked image to extract the watermark with key data in various environment, such as removing, mixed noises and JPEG compressions.
서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)
김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1
In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(PPNG), we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 64.5% in 1998.
미세 채널에서 가스 경계면을 이용한 미세 유체의 폭 좁히기
손상욱(Sang Uk Son),이승섭(Seung S. Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
A novel method for narrowing microfluid width in microchannel, essential in flow cytometry, was presented by forming and inflating gas boundaries symmetrically in perpendicular direction. The gas boundaries were generated by heating water with microheaters located beneath the microchannel of which shape was determined from empirical manner. The width of microchannel, which was 300 ㎛, was narrowed and maintained as up to 22 ㎛ which was near regular cell size. In the process the gas boundaries moved back and forth for adjustment of micro fluid width and it was maintained by two factors of pressure in the gas boundaries and the flow velocity of microfluid. The stable state began to be distorted at the velocity over 17.8 ㎜/s. The method has advantages of preserving cells intact from electrical fields and acoustic waves as usual in other on-chip devices, and using no external apparatus as syringe pumps in conventional method. Principle and fabrication were described in text as well the experiments for illustration.
손상욱(Sang Uk Son),최요한(Yo Han Choi),이승섭(Seung S. Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
This paper describes fabrication of a micro cell counter integrated with an oxygen micropump and Sephadex G-25 beads counting experiment. The device utilized a phototransistor, microwindow, and light source of microscope for beads detection. Microheater and microchannel were used for pumping and guiding of beads to the micro window. Counting capability of the device was tested with a peristaltic pump and the measured signals (~10 ㎷) with oscilloscope showed peak shape when beads passed the microwindow. Pumping of beads by the oxygen micropump was carried out by heating paraffin, which enveloped manganese dioxide (catalyst), to trigger the decomposition of hydrogen peroxide into water and oxygen. It lasted for 5 min with 7 ㎕ of wt. 30 % hydrogen peroxide. Beads counting by oxygen micropump showed peaks (2~20 ㎷) with 30 ㎕ of beads sample and the number of peaks by magnitude was acquired.
Demonstration and education of patch testing
손상욱 ( Sang Wook Son ) 대한피부과학회 2013 대한피부과학회 학술발표대회집 Vol.65 No.2
Patch testing is a standardized biological provocation test of investigating type IV hypersensitivity reactions. Patch testing is an essential investigation to identify specific allergens or to make the diagnosis of allergic contact dermatitis (ACD). Patch testing is indicated when contact allergy is suspected. The most commonly accepted technique for patch testing involves the application of test allergens under occlusion onto the skin of the upper back for two days. The patches typically are left in place for two days. The initial evaluation is generally performed 30 minutes after the patches are removed, when the transient erythema has resolved. The time of the second reading varies, but generally is on day four. An additional reading at day seven may be useful to identify a small number of late, positive reactions, in particular to neomycin and corticosteroids. Despite the confirmatory value of patch testing, dermatologists are reluctant to use patch testing. The substantial challenge in diagnostic patch testing is that reading is subjective and morphology of the patch-test response can be a confusing guide to whether the response is allergic or irritant. Therefore, there exists considerable inter-individual variation in how patch tests are both read and then interpreted by clinicians. Interpretation of the relevance of the reactions is difficult and perhaps requiring repeated open application testing, work-site visits. The clinician`s knowledge and experience can greatly affect the results. In this program, we will discuss standardized method and interpretation of patch testing as well as common allergens in Korean patients with contact dermatitis.
LMS기반 트랜스버설 필터의 컨벡스조합을 위한 부밴드 적응알고리즘
손상욱(Sang-Wook Sohn),이경표(Kyeong-Pyo Lee),최훈(Hun Choi),배현덕(Hyeon-Deok Bae) 대한전기학회 2013 전기학회논문지 Vol.62 No.1
Convex combination of two adaptive filters is an efficient method to improve adaptive filter performances. In this paper, a subband convex combination method of two adaptive filters for fast convergence rate in the transient state and low steady state error is presented. The cost function of mixing parameter for a subband convex combination is defined, and from this, the coefficient update equation is derived. Steady state analysis is used to prove the stability of the subband convex combination. Some simulation examples in system identification scenario show the validity of the subband convex combination schemes.
성긴임펄스 응답 시스템을 위한 부밴드 IPNLMS 적응필터
손상욱(Sang-Wook Sohn),최훈(Hun Choi),배현덕(Hyeon-Deok Bae) 대한전기학회 2011 전기학회논문지 Vol.60 No.2
In adaptive filtering, the sparseness of impulse response and input signal characteristics are very important factors of it's performance. This paper presents a subband improved proportionate normalized least square (SIPNLMS) algorithm which combines IPNLMS for impulse response sparseness and subband filtering for prewhitening the input signal. As drawing and combining the advantage of conventional approaches, the proposed algorithm, for impulse responses exhibiting high sparseness, achieve improved convergence speed and tracking ability. Simulation results, using colored signal(AR(4)) and speech input signals, show improved performance compared to fullband structure of existing methods.