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웹상에서의 효과적인 콘텐츠 전송을 위한 가용율 기반의 서버 재설정 시스템
송승현,장성호,이종식,Song, Seung-Hyeon,Jang, Sung-Ho,Lee, Jong-Sik 한국시뮬레이션학회 2009 한국시뮬레이션학회 논문지 Vol.18 No.3
The server redirection system replicates contents on replica servers in the distributed network environment. When users make a request for contents, the system can provide the contents much faster than the client-server network system. In the server redirection system, it is the most important to select the optimal replica server with user's information because many replica servers are geographically distributed. And, the system can serve contents to users flexibly if a redirector is well constructed. In this paper, the redirector makes a list of candidates suitable for user conditions by the decision tree method and calculates the availability of each replica server. And, the redirector selects the replica server with the highest availability. This paper also proposes an availability-based server redirection system that predicts the availability of each replica server in order to reduce the workload of replica servers and the repetitive communication messages between a redirector and replica servers. If a user accesses the network path for the replica server selected and noticed by the proposed system, the user can get contents effectively and efficiently.
갈근해기탕가미방(葛根解肌湯加味方)과 삼황세제가미방(三黃洗劑加味方) 병용이 NC/Nga 생쥐의 아토피 피부염에 미치는 영향
황치환,윤채성,송승현,원영호,황충연,Hwang, Chi-Hwan,Yun, Chae-Sung,Song, Seung-Hyeon,Weon, Young-Ho,Hwang, Chung-Yeon 대한한방안이비인후피부과학회 2008 한방안이비인후피부과학회지 Vol.21 No.2
Objectives: Galgeunhaegitang-gamibang(GH) and Samhwangseze-gamibang(SG) has been known that they are helpful for treatment of atopic dermititis clinically, but there is no report about the effect of GH and SG. So, author aimed to investigate the effects of GH and SG on atopic dermititis of NC/Nga mice. Methods : NC/Nga mice were divide into three group : normal, control, and experimental group. Atopic dermatitis was induced in the control and experimental group by spreading DNCB. Then GH was orally administered three times in a week for 8 weeks to the experimental group and SG was spreaded two times in a day for 8 weeks to the experimental group, while the control group was given normal saline. We observed changes of clinical skin severity score, serum IgE, IL-4, IL-4, IL-5, IL-6, IgM, IgGl, $IFN-{\gamma}$ and so on. We used one-way ANOVA test statistically(p<0.01). Results : Clinical skin severities of experiment group in 13 and 16weeks were significantly decreased by 48% and 55% compared to the control group. Serum IgE, IL-4, IL-5, IL-6, IgM, IgGl levels of experimental group were singnificantly decreased compared to the control group. Serum $IFN-{\gamma}$ level of the experimental group was significantly increased against control group. mRNA expression levels of IL-4, IL-5, IL-6 and CCR3 in the skin tissues of experimental group were significantly decreased compared to the control group. In contrary, $IFN-{\gamma}$y mRNA expression level were increased compared to the control group. Histological observation of the ear and skin tissues showed that the extents of inflammation and infiltrated immune cells in the epidermis and dermis of experimental group were highly deminished compared to the control group. Judging from that $IL-1{\beta}$, $TNF-{\alpha}$, IL-6 expression of gene, the effects of inflammatory cytokine revelation were significantly decreased compared to the control group. In the model inducing COX-2 activity in RAW 264.7 cell, COX-2 activity was significantly inhibited depending on the density of GH compared to the control serum. According to cell multiplication, examination of cell toxicity showed that GH is safe at the density of 10, 50, 100mg/l and even 1000mg/l. Conclusion : Accordin to the above results, it is considered that GH and SG is effective treatment for the atopic dermatitis.
Jeong-Eun Lee(이정은),Seung-Hyeon Song(송승현),Ji-U Ha(하지우),Hyo-Ri Kim(김효리),Chang-Soon Lee(이창순),In-Sik Cho(조인식) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The elastic modulus and Poissons ratio have been measured by the tensile test with the attachment of gauge sensors. However, the simpler dynamic method has been developed by using the acoustic resonance frequency, which is much easier and more accurate than the conventional tensile test. The typical dynamic methods are (i) the Ultrasonic pulse echo method, (ii) the Resonance frequency method, and (iii) the Impulse Excitation Method. Although both the Ultrasonic echo method and the resonance frequency method have widely been used, the Impulse Excitation Method has come into the spotlight due to its simplicity and accuracy, which has also been prescribed in ASTM E1876. In this study, the practical control system has been implemented with the numerical analysis algorithm for the Impulse Excitation Method. With this technique, the dynamic elastic modulus and Poissons ratio have been measured and evaluated for structural materials such as Al7075-T6, STS304, STS420_J2, SCM440, STS630 and Ti6Al4V. Therefore, the reliability was verified through comparative evaluation of the results of the static test method and the dynamic test method for six structural materials.
Ultrasonic Fatigue Test Method for Stress Ratio Control
Hyo-Ri Kim(김효리),Seung-Hyeon Song(송승현),Ji-U Ha(하지우),Jeong-Eun Lee(이정은),In-Sik Cho(조인식) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Ultrasonic Fatigue Testing (UFT) is an accelerated fatigue test, typically at 20 kHz, which significantly shortens the application period of newly developed processes and materials in various mechanical parts and materials fields. In this paper, the system technology for controlling the stress ratio in ultrasonic fatigue testing is to be explained. This fatigue stress ratio control test is important for fatigue testing of aviation and power plant turbine parts, and is also an important method for crack propagation testing. Basically, an ultrasonic fatigue tester designed by applying the resonance analysis results to a 20KN tensile tester was attached to set the average stress and then enabled it at various stress ratios. Also, as a method of setting the corrected fatigue stress, the method of measuring the strain gauge at the center of the specimen and the method of simultaneously measuring the amplitude of the end of the specimen are described. Therefore, the results of this paper are intended to explain the construction of an ultrasonic fatigue tester optimized to suit various fatigue conditions and environments.