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류진영 ( Jin-young Ryu ),장승주 ( Seung-ju Jang ),임채덕 ( Chae Duk Lim ),마유승 ( Yu Sung Ma ) 한국정보처리학회 2005 한국정보처리학회 학술대회논문집 Vol.12 No.2
현재 오픈소스인 리눅스를 기초로 많은 프로젝트들이 진행되고 있다. 그러나 하드웨어의 지식과 밀접한 관계를 가지고 있는 리눅스 디바이스 드라이버 개발 분야는 접근이 어려워 개발자들 역시 주의하고 있는 실정이다. 본 논문은 리눅스 디바이스 드라이버의 오류 유형을 토대로 오류 없이 정상적으로 동작하는 리눅스 디바이스 드라이버 개발을 위한 테스트 모듈 개발에 목적을 둔다.
류진영,모용운,김경래,Ryu Jin-Young,Mo Yong-Woon,Kim Kyung-Rai 한국건설관리학회 2000 한국건설관리학회 논문집 Vol.1 No.3
본 논문은 건설 감리 수행시 영향을 미치는 계층적 관리요소를 분석하여 감리사업 평가 모델을 구축함으로써 감리 프로젝트 수행시의 효율을 극대화시키는데 그 목적이 있다. 연구는 현장 실무자에 대한 설문조사를 통해 감리사업의 현황과 영향요소를 산정하였고, 이를 바탕으로 현장 감리자의 운영 및 관리능력을 평가할 수 있는 평가 모델을 구축하였다. 이러한 평가도구를 감리사업의 의사결정 및 평가 프로세스에 반영하여 전반적인 사업관리상의 효율을 증대시킬 수 있다. The purpose of this study is to maximize project efficiencies in construction management by analyzing hierarchical factors that effect in project supervision system, and consequently constructing managerial CSF(Critical Success Factors). For this study, the tools for evaluating operating and management abilities of site engineers are built from analyzing status and issues, deducing influence factors and rating cardinal scales of these factors from survey results. These evaluation tools are reflected to the construction supervision decision making process so that can improve project management effectiveness.
디지털 방사선에서 조사선량과 관전압조절에 의한 원본영상과 처리영상 분석
김보라,류신영,석진영,최준구,Kim, Bo-Ra,Ryu, Sin-Young,Seok, Jin-Young,Choi, Jun-Gu 대한디지털의료영상학회 2011 대한디지털의료영상학회논문지 Vol.13 No.1
Dynamic range on the digital detector can be a representation to the ratio of maximum and minimum of pixel value. Wide dynamic range and post processing ability of the digital detector made difficult to recognize visually to high or low dose images. We were evaluated a change of mean pixel value on the original and processed image, when we controlled the kVp, mA, exposure time on the digital detector. On the kVp of a constant condition, we were acquired an original and processed image by changes of mA, exposure time. According to the thickness of the subject under the same conditions, to determine a relation of pixel value and X-ray intensity, we used an aluminum step wedge. When mA and exposure times were changed under the kVp of a constant condition, the X-ray intensity was decreased by the reduction of the mean pixel value. In addition when kVp was increased in a constant condition of mAs, the mean pixel value was increased according to the increment of the X-ray intensity. Therefore, low kVp, high mA and short exposure time were a way to reduce a patient dose.
석창포(石菖蒲) 전탕액(煎湯液)이 Glucose Oxidase에 의해 손상(損傷)된 대뇌피질(大腦皮質) 신경세포(神經細胞)에 미치는 영향(影響)
최공한,박승택,류도곤,최민호,허진영,강성도,고정수,양상철,성은경,조남수,이춘우,서의석,류영수,Choi, Kong-Han,Park, Seung-Taeck,Ryu, Do-Gon,Choi, Min-Ho,Hea, Jin-Young,Kang, Sung-Do,Go, Jeong-Soo,Yang, Sang-cheal,Sung, Yeun-Kyung,Cho, Nam-Su,L 대한동의생리학회 1999 동의생리학회지 Vol.14 No.2
The purpose of this study is to examine the toxic effects caused by Glucose Oxidase(GO) and the effects of herbal extracts such as Acori Rhizoma(AR) on the treatment of the toxic effects. For this purpose, experiments with the cultured cell from the cerebrums of new born mice were done. The results of these experiments were as follows. 1. GO, a oxygen radical, decreased the survival rate of the cultured cells on NR assay and MTT assay. 2. GO, a oxygen radical, decreased the amount of neurofilaments and total protein. 3. AR have efficacy of increasing the amount of neurofilament. 4. AR have efficacy of increasing the amount of total protein. From the above results, It is concluded that AR has marked efficacy as a treatment for the damages caused in the GO-mediated oxidative process. And AR is thought to have certain pharmacological effects on controlling over aging. Further clinical study of this pharmacological effects of AR should be complemented.
IPS 구축을 위한 Embedded Linux 성능 비교
양중규 ( Seung-ju Jang ),류진영 ( Jin-young Ryu ),남진우 ( Jin-woo Nam ),장승주 ( Joong-kyu Yang ) 한국정보처리학회 2005 한국정보처리학회 학술대회논문집 Vol.12 No.1
본 논문은 IPS 구축에 있어서 핵심적인 역할을 수행하는 운영체제를 위해 최근 각광을 받고 있는 Embedded Linux Kernel 의 성능을 테스트하기 위한 환경을 구축한다. Benchmarking tool 인 UnixBench 프로그램을 사용하여 성능을 테스트 한다. 또한 standard kernel 의 성능 테스트도 같이 포함하여 종합적으로 성능 결과를 비교 분석한다. 이런 실험 결과를 통해서 IPS 시스템에 적합한 임베디드 리눅스 운영체제 결정을 하고자 한다.
칠복음(七福飮)이 Glucose Oxidase에 의해 손상(損傷)된 대뇌피질(大腦皮質) 신경세포(神經細胞)에 미치는 영향(影響)
최공한,박승택,류도곤,최민호,엄상섭,허진영,강성도,고정수,서의석,성은경,조남수,이춘우,황일택,선성규,류영수,Choi, Kong-Han,Park, Seung-Taeck,Ryu, Do-Gon,Choi, Min-Ho,Um, Sang-Sub,Hea, Jin-Young,Kang, Sung-Do,Go, Jeong-Soo,Sou, Eui-Suk,Sung, Yeun-Ky 대한동의생리학회 1999 동의생리학회지 Vol.14 No.2
As the average life span have been lengthened and the rate of senile population have been raised, chronic degenerative diseases incident to aging has been increased rapidly and become a social problem. With this social background, recently, the facts that oxygen radicals(OR) have toxic effects on Central Nervous System and Peripheral Nervous System and cause neuropathy such as Parkinson's Disease, Alzheimer Disease have been turned out, and accordingly lots of studies on the mechanism of the toxic effects of OR on nerves, the diseases caused by OR and the approaches to curing the diseases have been made. The purpose of this study is to examine the toxic effects caused by Glucose Oxidase(GO) and the effects of herbal extracts such as Chilbokyeum(CBY) on the treatment of the toxic effects. For this purpose, experiments with the cultured cell from the cerebrums of new born mice were done. The results of these experiments were as follows. 1. GO, a oxygen radical, decreased the survival rate of the cultured cells on NR assay and MTT assay 2. GO, a oxygen radical, increased lipid peroxidation and the amount of LDH. 3. CBY have efficacy of decreasing lipid peroxidation. 4. CBY have efficacy of decreasing the amount of LOH. From the above results, It is concluded that Chilbokyeum has marked efficacy as a treatment for the damages caused in the GO-mediated oxidative process. And Chilbokyeum is thought to have certain pharmacological effects on controlling over aging and treating Dementia. Further clinical study of this pharmacological effects of Chilbokyeum should be complemented.
장승주(Seung-Ju Jang),황정현(Jung-Hyen Hwang),류진영(Jin-Young Ryu) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.1A
본 논문에서는 PDA 용 임베디드 리눅스의 파일시스템을 설계 한다. 개발을 위한 Host PC 구축 [크로스 컴파일러(Cross compiler)] 및 커널 소스의 패치와 디버그를 통한 개발을 한다. 본 논문에서 PDA 시스템에 리눅스를 포팅 하여 PDA 임베디드 리눅스 시스템 및 파일 시스템을 설계 한다.
기존선 고속화 구간 증속시험을 통한 노반 형식별 자갈도상궤도구조 상태 평가에 관한 연구
김만철(Man-cheol Kim),박용걸(Yong-gul Park),임형준(Hyoung-Jun Lim),박선희(Sun-Hee Park),류진영(Jin-Young Ryu) 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.5
국내에서는 철도경쟁력 확보를 위해 현재 기존선에 대해 200km/h 이상으로 고속화를 추진하고 있다. 이에 따라 150km/급으로 설계되어 운영중인 기존선 자갈도상궤도에서는 궤도 부담력 증가로 유지보수의 증가가 예상된다. 본 연구에서는 속도 단계별 증속시험을 통해 궤도 부담력을 측정하여 고속화에 따른 궤도 부담력 예측식을 도출하였고, 노반 형식별 궤도지지강성과 도상계수를 분석하여 자갈도상궤도의 상태를 평가하였다. 또한 이들을 독일의 자갈도상궤도구조와 비교하여 유지보수 저감을 위한 기존선 고속화구간의 자갈도상 궤도에 대한 개량방안을 제안하고자 하였으며, 이러한 개량방안에 대해서는 추후 고속화 조건에 따른 실대형 시험을 통한 궤도침하 발생률 및 경제성 분석을 통해 구체화할 예정이다. The conventional railway lines was planed the speed up of over 200 km/h to ensure the competitiveness for a domestic railway. However the general ballasted tracks in a convention line was designed by the minor design class that was set on the design speed of tracks under 150km/m. Therefore, the conventional ballasted tracks was expected to increasing the maintenance cost due to increasing the dynamic track forces by increasing vehicle speed. In this study, the field tests were performed to evaluate that the influence the increasing vehicle speed on the dynamic track responses. Therefore, the prediction equation for dynamic track response was derived, and compared with the different substructure type such as earthwork, bridge and tunnel. The relationship between the track support rigidity, the ballast coefficient and the dynamic track response for various types of substructures currently employed in Korean convention railway line was assessed by performing field tests using actual vehicles running along the service lines. Field tests were performed on ballasted tracks with different substructure type, i.e., earthwork, bridge and tunnel. The experimentally measured track support rigidity and ballast coefficient were compared with the corresponding track support rigidity and ballast coefficient of German railway through field tests for the various substructure types on the service line. We found that the condition of ballast, substructure type and the corresponding track support rigidity and ballast coefficient directly affect the dynamic track response.