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윤동식,이병관,Yun, Dong-Sik,Lee, Byeong-Gwan 한국정보처리학회 1995 정보처리논문지 Vol.2 No.2
VDFS(V-kernel Distributed File System) constructed in this paper proposes an asymmetric Distributed File System so that various problems of existing symmetric structures like NFS & RFS may be solved in small-sized system. Particulary, in this paper, server workload can be reduced by using a caching mechanism and remote access transparency can be improved by using a sharing file duplicately. 본 논문에서 구축된 VDFS는 소형 시스템내에서 현존하는 NFS와 RFS 같은 대칭형 화일 시스템 구조들에서 나타나는 문제점들을 해결한 비대칭형 분산 화일 시스템을 제안하였다. 특히 본 논문에서는 중점적으로 다루어질 부분은 공유 화일의 중복 사용 을 통해서 보다 많은 투명성(Transparency)을 제공하고 캐슁 기반으로 한 원격 화일 서비스를 한층 더 증가시켜 서버 부하와 통신량을 감소시키므로 시스템의 성능을 향상 시키는데 있다.
M&S를 이용한 사격통제 시스템의 설계검증 및 성능분석에 관한 연구
윤동식,김천환,임영택,배윤지,Yun, Dong Sik,Kim, Chon Hwan,Lim, Young Taek,Bae, Yoon Ji 한국시스템엔지니어링학회 2009 시스템엔지니어링학술지 Vol.5 No.1
Gun fire solution computed in ballistic computing unit (BCU) needs to evaluated before applying in real fire. In this paper, ballistic performance analysis method is studied for reasonable prediction or hit probability with ballistics error presentation on hitting plane. Also Gun fire solution using interacting multiple model (IMM) algorithm is analyzed through proposed method.
윤동식,이병관,Yun, Dong-Sik,Lee, Byeong-Gwan 한국정보처리학회 2000 정보처리논문지 Vol.7 No.3
In this paper, object replication Client/server under distributed computing system is design and implementation. Today many end-users have a computer communication by using internet in the distributed system of client/server. If many users request services to a specific remote server, the server should have got a overhead for hat service processing, delayed the speed for replay, and bring a bottleneck in communication network. Therefore object replication method was proposed to solve this problems. The growth of internet works and distributed applications has increased the need for large scale replicated systems. However, existing replication protocols do not address scale and autonomy issues adequately. Further, current application protocol require consistency of different levels, and therefore should be the selection function of consistency in them, in order to have particular semantics of each level. In this paper, server overhead and bottleneck happening in remote procedure call be using server object replication. Therefore access transparency can be improved by sharing object duplicately. So it will Keep up with the consistency within the replicated objects.
조류 인플루엔자와 구제역 바이러스 차단방역을 위한 미산성 차아염소산수의 소독 조건
김진윤,윤동식,이화용,정우석,박승춘,Kim, Jin-Yoon,Yun, Dong-Sik,Lee, Haw-Yong,Jeong, Woo-Seog,Park, Seung-Chun 대한수의학회 2019 大韓獸醫學會誌 Vol.59 No.2
This study examined the disinfection conditions (exposure time, 0-30 min; exposure temperature, $4^{\circ}C-65^{\circ}C$) of hypochlorous acid water (HOCl) in automobile disinfection equipment. The study tested poliovirus type 1 (PV1), low pathogenic avian influenza virus (AIV, H9N2), and foot and mouth disease virus (FMDV, O type). As a result, the PV1 and FMD viruses were inactivated easily (virus titer 4 log value) by HOCl (> 100 ppm) but the AIV required higher exposure temperatures (> $55^{\circ}C$). In conclusion, the exposure temperature and time are important factors in deactivating AIV and FMDV.
탄산가스 레이저 조사가 법랑질 표면구조와 치면열구 전색재의 결합강도에 미치는 효과
김종수,김용기,윤동식 大韓小兒齒科學會 1998 大韓小兒齒科學會誌 Vol.25 No.4
In this study, sttempt has been made to evaluate the effect of CO₂laser irradiation on enamel surface structure and the bond strength of sealant material. Conventional acid etching was used as a control technic for comparison. The results obtained from this experiment were as follows: 1. The highest mean shear bond strength value was observed in samples of Group Ⅰ(acidetching) with the statistical significance(p<.05) between all the other groups. 2. The shear bond strength in Group Ⅳ was the lowest among laser etching groups. but there were no significant difference berween them(p>.05). 3. Scanning electron microscopic observation showed that the rough and irregular surface was created by CO₂laser treatment with the formation of numerous pores, micro-cuacks, and small bubble-like inclusion. Increasing the energy density induced localized surface melt with a thin smooth glaze-like appearance. 4. In acid-etched control stecimen cohesive failure predominated. whereas adhesive failure was the main mode in laser-treated group. Based upon the above-mentioned results, it can be assumed that the CO₂laser is not an adequate substitute for the acid-etch technique in enamel preconditioning. More studies are required to explore the effective condition of laser irradiation which could attain the better bond strength of restorative materials.
김진범,이인희,윤동식 대한무도학회 2000 대한무도학회지 Vol.2 No.1
This study aims to examine the background and die concrete physical activities of hwarang("flower of youth") of Silla for the purpose of deducing modem significance from a standpoint of the martial arts history. I have reached the following conclusions. First, the religious aspect of the hwarang was characterized by the factors of shamanism, taoism, and Buddhism. The actions of the hwarang as manifested in their physical activities originated from the ideological groundwork of the hwarangdo(hwarangship). The hwarangdo seems to have been based upon the racial tradition and belief for the express purpose of defending national territory and sovereignty by closely uniting and specially training the elite youth so that they could be of great use to the country not only militarily but socic-politically as well. When in perfect alignment with this supreme policy of the state, the hwarangdo seems to have functioned as the strongest internal movement - national movement. The central ideology of the hwarangdo were loyalty, filial piety, and mutual trust. Second, the physical activities of the hwarang may be classified into three categories - hunting, singing and dancing, and martial art. Hunting includes political and military methodology. Some hunting pictures of the Silla dynasty, however, showed scenes akin to recreation. Third, the physical activities of the hwarang had a close relation with education. It is worth notice that in training the hwarang not merely physical education but also moral and musical education were placed great importance on. On of the educational objectives in training the hwarang was apparently to produce Hercules or warriors that were m great demand in the country and society. The hwarng was supposed to be a youth of perfect health and undaunted courage and one who boldly stood up to an injustice. In short, the ideal the hwarang sought was to become a balanced personality with sufficient intellectual and emotional cultivation as well as being a master of martial arts by constantly practicing physical training.