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P2P 캐싱을 기반으로 한 효율적인 브로드캐스트 스트리밍 기법
이치훈,계이기,정인범,최창열,최황규 강원대학교 정보통신연구소 2006 정보통신논문지 Vol.10 No.-
Video-on-Demand is undoubtedly a promising technology for many important applications. Several periodic broadcast techniques have been proposed for the cost-effective implementation of such systems. However, there is a server delay for all of them. To address the shortcoming, we present a new scheme improving the staggered broadcasting by jointly using prefix caching scheme of VOD system in P2P environments. In thins paper, each client plays a role in the first segment staggered broadcasting server to serve the prefix stream to other clients that request the same video stream. The buffer can be empty after the client has served the following client. As a result, we are able to achieve no service latency time and the low buffer space.
권일범,김치엽,윤동진,이승석 한국비파괴검사학회 2003 학술대회 논문집 Vol.- No.1
FBG(Fiber Bragg grating) sensor, which is one of the fiber optic sensors for the application of smart structures, can not only measure one specific point but also multiple points by multiplexing techniques. We have proposed a novel multiplexing technique of FBG sensor by the intensity modulation of light source. This technique is applicable to WDM(Wavelength Division Multiplexing) technique and number of sensors in this system can be increased by using this technique with WDM technique
김치엽,최만용,권일범,이승석 한국비파괴검사학회 2003 학술대회 논문집 Vol.- No.1
Structural health monitoring system should developed to be based on internet and database technology in order to manage efficiently large structures. This system is operated by internet connected with the side of structures. The monitoring system has some functions: self monitoring, self diagnosis, and self control etc. Self monitoring is the function of sensor fault detection. If some sensors are not normally worked, then this system can detect the fault sensors. Also Self diagnosis function repair the abnormal condition of sensors. And self control is the repair function of the monitoring system. Especially, the monitoring system can identify the replacement of sensors. For further study, the real application test will be performed to check some unconvinrences.
공정변수의 변동을 고려한 호감도 함수를 통한 다중반응표면 최적화
권준범,이종석,이상호,전치혁,김광재 한국경영과학회 2005 한국경영과학회지 Vol.30 No.1
A desirability function approach to a multiresponse problem is proposed considering process parameter fluctuation which may amplify the variance of response. It is called POE(propagation of error), which is defined as the standard deviation of the transmitted variability in the response as a function of process parameters. In order to obtain more robust process parameter setting, a new desirability function is proposed by considering POE as well as distance-to-target of response and variance. The proposed method is illustrated using a rubber product case in Ribeiro et al. (2000).
안치영,이경종,박재범,장재연,김문종 大韓産業醫學會 2001 대한직업환경의학회지 Vol.13 No.1
목 적 : 조선소에서 만성적 유기용제 노출과 간기능과의 관련성을 규명하고자 하였다. 방 법 : 한 대형 조선소에서 도장작업 부서의 근로자 461명과 유기용제 노출이 없는 대조군 125명, 총586명의 남성 근로자를 대상으로 유기용제 생체누적노출량과 간기능검사 지표와의 관련성을 단면적 연구를 통하여 수행하였다. 일반적 특성, 직업적 특성, 간기능 검사와 작업환경 평가 및 생물학적 모니터링을 이용하여 자료와 변수들을 수집하여 이변량 분석과 로지스틱 회귀분석을 시행하였다. 간 기능을 정상과 비정상으로 구분하여 종속변수로 삼고 생물학적 모니터링을 근간으로 하여 생체 누적 노출량(CE)을 독립변수로 하여 로지스틱 회귀 분석을 시행하였다. 결 과 : 다중 로지스틱 회귀분석을 한 결과SGOT(>351ua), SGPT(>401U/L), γ-GTP(>631U/L)에 대해 유기용제 생체누적노출량(CE)은 각각 1.10(95 %Cl, 1.02~l.20), 1.10(95 %Cl,1.Ol~l.19), 1.10(95% Cl; 1.Ol~l.19)의 비차비를 보였다. 결 론 : 그러므로 혼합 유기용제에의 누적폭로는B형 간염 항원이 음성인 남성근로자들에 있어 SGOT, SGPT, γ-GTP 등의 간기능검사의 비정상결과(검사치의 증가)에 유의한 관련성이 있는 것으로 판단된다. Objectives : This study was conducted to evaluate the association of cumulative exposure to organic solvent with liver function. Methods : We conducted a cross sectional study. 461 male workers who Perform painting job at a shipyard and use organic solvents routinely and 125 workers of the same shipyard who never have been exposed to organic solvents were studied. All subjects who were confirmed not having HBsAg surveyed their age, BMI (body mass index), alcohol drinking and smoking history, and examined liver function test (SGOT, SGPT, γ-GTP, Total protein, albumin, total bilirubin, direct bilirubin) . The amount of cumulative exposure (CE) to mixed organic solvents were measured by biological monitoring method using their metabolites in urine. Results : The CE was observed as a significant variable with logistic regression analysis on abnormality of SGOT(>35IU/L) , SGPT(>40IU/L) and γ-GTP(>63IU/L), their odds ratio were 1.10 (95 %CI, 1.02-1.20), 1.10 (95 %CI, 1.01-1.19), and 1.10 (95 %CI, 1.01-1.19) each. Conclusions : Therefore we suggest that the cumulative exposure to mixed organic solvents might be a significant variable on abnormal liver function indices (SGOT, SGPT, γ-GTP) in male shipyard workers.
소음·진동에 따른 참전복(Haliotis dissus hannai)의 행동·생태학적 변화
최상덕,정형택,윤호섭,안치영,이삼노,이우범 國立 麗水大學校 환경문제硏究所 2001 環境硏究論文集 Vol.4 No.-
These days, the underwater excavation and the piling work have been commonly used to reclaim land and to build a breakwater. As the piling work generates high underwater sound pressure in all direction, various kinds of marine organisms are largely affected even if they live a long distance from the piling work. Therefore, this paper describes the relationship between the behavior of abalone(Haliotis discus hannai) of 50cm long and the environmental noise level with vibration due to the piling work. We have separated the research into two parts. The one is continuance impact, the other is intermittent impact. The following are the results obtained from the present investigation: Comparing 0.5cm/sec vibration with 50dB noise and 0.9cm/sec vibration with 60dB, the previous one show a faster reaction speed than the later one. Futhermore the later one showed that pulling up on their shell, in order to avoid the epidemic, moving around, small organisms are included to hide under big organisms, alerting posture. However we couldn't find a consistent standard in our research.
Perioperative Antibiotic Prophylaxis May Not Be Required Routinely in Thyroid Surgery
Kwan Bum Lee,Soo Young Kim,Seok Mo Kim,Ho Jin Chang,Bup Woo Kim,Yong Sang Lee,Hang Seok Chang,Cheong Soo Park,Chi Young Lim 대한갑상선-내분비외과학회 2017 The Koreran journal of Endocrine Surgery Vol.17 No.4
Purpose: Although perioperative antibiotic prophylaxis is used to prevent surgical site infection (SSI), thyroid surgery is classified as a clean surgical procedure and routine use of perioperative antibiotic prophylaxis is not recommend. The purpose of this study is to evaluate the therapeutic benefits of using perioperative antibiotic prophylaxis in thyroid surgery. Methods: We evaluated medical records of 1,895 patients who underwent thyroid surgery between January 2013 and December 2013. We divided 2 groups with or without perioperative antibiotic prophylaxis. Clinical factors including sex, age, body mass index (BMI), and comorbidity and surgical factors for SSI were analyzed. Results: The male to female ratio was 1:3.3, the average age was 43 (14-82) years old. The numbers of groups without and with antibiotic prophylaxis were 593 and 1,303. Thirty-seven cases (2.0%) of postoperative complications were observed including chyle leakage, SSI, and nerve injury. The SSI was occurred in 10 patients (0.5%). Clinical factors with SSI were analyzed and there was no statistical significance between 2 groups. Conclusion: In thyroid surgery, perioperative antibiotic prophylaxis may not be required routinely once the surgical procedure underwent with aseptic condition and the patients care was performed appropriately.
( Hyun Lee ),( Yong Chul Lee ),( So Ri Kim ),( Yang Keun Rhee ),( Heung Bum Lee ),( Seoung Ju Park ),( Chi Ryang Chung ),( Seung Yong Park ) 대한결핵 및 호흡기학회 2012 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.114 No.-
Despite the successful result of medical therapy for pulmonary tuberculosis, resistance to drugs and complications of the disease still present a challenge. Although a bronchopleural (bronchopulmonary) fistula is the most common type of various fistula complications, bronchial fistulas caused by pulmonary tuberculosis are rare complications. Moreover, to our knowledge, fistula between the bronchus and lung parenchyma in drug resistant tuberculosis has not been previously reported. Here, we report a case of fistula between left bronchus and lung parenchyma in a-68-old female patient with isoniazid resistant tuber-culosis, which was treated surgically.