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광선추적법 기반의 적분구 분석 시뮬레이터에서 OpenMP 지시어를 이용한 속도 향상 및 몬테카를로 방법의 무작위성 보장
김승용,김대찬,오범환,박세근,이일항,이승걸,Kim, Seung-Yong,Kim, Dae-Chan,O, Beom-Hoan,Park, Se-Geun,Lee, El-Hang,Lee, Seung-Gol 한국광학회 2011 한국광학회지 Vol.22 No.2
광선추적법을 기반으로 하는 적분구 분석 시뮬레이터의 계산속도를 향상하기 위하여 OpenMP 지시어를 이용한 병렬처리 방식의 시뮬레이터를 개발하였으며, 몬테카를로 방법의 무작위성을 보장하기 위해 병렬 난수 발생기인 RngStream 패키지를 활용하였다. $10^7$개 이상의 광선 수를 사용하여 0.5%의 오차 범위에서 적분구 이론식과 일치하는 결과를 얻을 수 있었으며, 스레드 수에 따른 계산속도 향상 효과를 확인하였다. 또한 적분구 문제에 관한 공간반응분포함수(spatial response distribution function)을 전산모사하여, 기존 문헌의 결과와 일치함을 확인하였다. In order to improve the calculation speed of an integrating-sphere simulator based on a ray-tracing method, parallel processing with OpenMP directive was implemented into the simulator and the randomness of Monte Carlo method was guaranteed by utilizing a parallel random number generator. It was confirmed that simulation results obtained with more than $10^7$ rays showed good agreement with theoretical results within the error range of 0.5%, and that the calculation speed improved as the number of threads increased. Finally, the spatial response distribution functions of a real integrating sphere were simulated and compared with previous results.
김승용,정병수,최규철 ( Seung Yong Kim,Byoung Soo Chung,Kyu Cherl Choi ) 대한피부과학회 1991 대한피부과학회지 Vol.29 No.1
This mycological and cultural investigation was made in 86 cases of onychomycosis diagnosed on positive KOH wet mount at Chosun University Hospital from October, 1989 to February, 1990. The results were as follows : l. The ratio of male to female was 1.2:1. According to Zaiass classificat.ion, distal subungual onychomycosis (DSO) was the most predominant type(79 cases) and others, in decreasing frequency, were superficial white onychomycosis (SWO) (Fcases), total dyst,rophic onychomycosis (TDO) (1 cases, and proximal subungual onychomycosis (PSO) was not. found. 2. In DSO, isolat,ed fungi were T. mentagrophyte(31 cases), i'. rubrum(23 c<ses), saprophyt.es(7 cases) and C albicans (5 cases). In SWO, 2 species were isolated, which were T. mentagraphytes (5 cases) and saprophyte (1 case). C. albicans was cultured in one case of TDO. 3. Eight cases of iisolat,ed sapr ophytes were Aspergillus ( 5 cases), Scopulariopsis (1 case), Hormodendrum(1 case), and Cepalosporium(1 case). Saprophytes were tound only in toe nails. 4. Uo saprophytes were isolated from coexisting skin lesi.ons. Among 10 cases of coexisting tinea manus and/or tinea corporis, T. rubrum were cultured in 8 cases. 5. The positive rate of culture by two different sampling methods and media was as follows : On Sabouraud glucose agar media, it was 47.7% (41 cases) by clipping methodand 40.7% (35 Cases) by file-method. On dermatophyte test medium, it was 43.0 (3'7 eases) by cliipping method and 45.3% (39 cases) by file-method. It seem that the selection of sampling site is important in increasing the positive rate in culture of onychomyc.osis. (Kor J Dermatol 29(1): 50 55, 1991)
김승용,남충모,Kim, Seung-Yong,Nam, Choong-Mo 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.10
In this paper, a high power RF amplifier module using AlN substrate of high thermal conductivity has been proposed. This RF amplifier module has the advantage of compact size and effective heat dissipation for the packaging of high power chip. To fabricate the thru-hole and scribing line on AlN substrate, the key parameters of $CO_2$ laser were experimented. And then, microstrip lines and spiral planar inductors were fabricated on an AlN substrate using the thin-film process. The fabricated microstrip lines on the AlN substrate has an attenuation value of 0.1 dB/mm up to 10 GHz. The fabricated spiral planar inductor has a high quality factor, a maximum of about 62 at 1 GHz for a 5.65 nH inductor. Packaging of a RF power amplifier was implemented on an AlN substrate with thru-hole. From the measured results, the gain is 24 dB from 13 to 15 GHz and the output power is 33.65 dBm(2.3 W).
김승용(Seung Yong Kim),신동식(Dong Sik Shin),정병수(Byoung Soo Chung),최규철(Kyu Chul Choi) 대한피부과학회 1990 대한피부과학회지 Vol.28 No.1
Malignant fibrous histiocytoma is the most common soft tissue sarcoma in adult life and shows a mixed proliferation of both fibroblsstic & histiocytic cells. We report a case of myxoid malignant fibrous histiocytoma involving right lower leg in a 68-year-old male patient, who presented with a childs palm-sized nodular mass of 3 years duration. Histoapthologically, the tumor had varying proportion of myxoid & cellular components. The myxoid areas showed spindle and pleomorphic cells arranged in a vague storiform pattern, abrupt transition between a solidly cellular area and a myxoid area, and lipoblast-like cells. The cellular areas showed spindle cells arranged in a storiform pattern characteritic of the typical pleomorphic malignant fibrous histiocytorna. (Kor J Dermatol 28(1): 94 98, 1990)
항생제 내성 Enterococcus faecalis에 대한 감태(Ecklonia cava) 추출물의 항균 시너지 효과
김승용 ( Seung Yong Kim ),김영목 ( Young Mog Kim ),김은정 ( Eun Jung Kim ),이명숙 ( Myung Suk Lee ) 한국수산과학회 2015 한국수산과학회지 Vol.48 No.1
With continuing demand for the development of new, effective and safe therapies, an investigation was carried out to test the efficacy of an antibacterial agent derived from marine edible seaweed. The methanolic extract of Ecklonia cava from marine edible seaweed evinced potential antibacterial activity against Enterococcus faecalis. Among five solvent-soluble fractions of E. cava methanolic extract, the ethyl acetate soluble extract (EtOAc) exhibited the strongest antibacterial activity, with a MIC value of 128 μg/mL against E. faecalis strains. Furthermore, a synergistic antibacterial effect between an antibiotic and the EtOAc fraction was assessed using fractional inhibitory concentration (FIC) indices. A combination of ciprofloxacin and the EtOAc fraction resulted in a ∑FICmin range of 0.188 and ∑FICmax of 0.508 to 563, suggesting that the ciprofloxacin-EtOAc fraction of E. cava combination resulted in an antibacterial synergy effect against E. faecalis.
기업 보안을 위한 CCTV 비할당 영역 분석용 디지털 포렌식 솔루션 개발
김승용(Seung-yong Kim),김상욱(Sang-Wook Kim),황인철(In-Cheol Hwang) 한국인터넷전자상거래학회 2016 인터넷전자상거래연구 Vol.16 No.4
As information technology develops rapidly, various kinds of information generated in companies play an important role in securing and keeping competitiveness. In fact, many companies are using various kinds of information security technology in order to prevent information leak, especially CCTV is popular as a physical security. But there is some risk of demage in entire or partial images by intentional initialization, deletion, forgery or un-intentional physical media damage, fire, flood. Especially, it is important to extract and analyze image data in non-allocation area which saves image data when you can not watch them by DVR(Digital Video Recorder). The purpose of this study was to develop algorithm to restore necessary image data by the analysis of DVR file system of hard disk, and by the index restoration, when you have some problems in image data of DVR hard disk due to user’s mistake or intentional damage(deletion or initialization), or DVR device trouble. Especially it was focused on extract and analyze image data in the non-allocation area which saves image data when it is impossible to obtain image data by DVR device.
김승용(Seung-Yong Kim),김기덕(Ki-Duck Kim),김태형(Tae-Hyung Kim) 한국정보과학회 2006 한국정보과학회 학술발표논문집 Vol.33 No.2B
청소 로봇은 지도 작성 및 위치 인식을 기준으로 청소 방법을 랜덤(random)방식과 매핑(mapping)방식으로 분류 할 수 있다. 랜덤방식은 지도를 작성하지 않아 가격경쟁력이 있지만 효율이 떨어진다. 반면, 매핑방식은 지도를 작성하므로 청소 효율이 높지만 상대적인 가격경쟁력이 떨어진다. 그러므로 랜덤방식과 매핑방식의 문제점들을 보안하기 위해 본 논문은 고가의 센서 정보를 사용하지 않고 로봇이 주행 중에 발생되는 벡터(방향과 거리)값을 이용하여 로봇에게 지도 정보를 제공하는 알고리즘을 제안한다.