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깁스표본기법을 이용한 와이블분포의 위험률에 대한 베이즈추정
조건호,이우동,신양규,윤용화 慶山大學校 基礎科學硏究所 1998 基礎科學 Vol.2 No.1
와이블분포를 따르는 표본을 이용하여 위험률을 베이지안 방법을 이용하여 추정한다. 깁스표본법을 베이지안 추정에서 사후확률의 분포를 구하는 방법에 적용하여 위험률에 대한 사후분포와 주변사후분포를 추정하는 방법을 제안한다. 그리고, 9개의 가솔린 정류에서 쓴 sdufwjsekfrlrn(heat exchanger)에 대한 수명시간자료를 이용하여 제안된 방법으로 위험률에 대한 베이즈추정량을 구하고 최우추정량과 비교한다. In this paper, a Bayesian estimation of the hazard rate function of Weibull distribution is considered. Using Gibbs sampling approach, the posterior distribution of hazard and Bayes estimator of hazard are presented. Using 9 heat exchanger data, the proposed method is illustrated.
A Study on the Performance Comparison of 3D File Formats on the Web
Lee, Geon-hee,Choi, Pyeong-ho,Nam, Jeong-hwan,Han, Hwa-seop,Lee, Seung-hyun,Kwon, Soon-chul The Institute of Internet 2019 Journal of Advanced Smart Convergence Vol.8 No.1
3D file formats typically include OBJ (Wavefront file format), STL (STereoLithography), and FBX (Filmbox). Each format has limitations depending on its configuration and usage, and supported formats are different depending on the software application. glTF helps uniform integration of 3D file formats and allows for more efficient transmission of large 3D geometry files by organizing them in a binary format. This paper presents explanation on OBJ, FBX, and STL which are major examples of existing 3D file formats. It also explains the concept and characteristics of glTF and compares its performance with other 3D file formats on the web. The loading time and packets of each 3D file format are measured according to the web browser environment by means of Google Chrome, Firefox and Microsoft Edge. Experimental results show that glTF is the most efficient and that it exhibits the best performance. As to STL, relatively excessive traffic was observed. This study is expected to contribute to reducing rendering time on the web as 3D file formats are used.
( Muyeol Lee ),( Dong-geon Lee ),( Yujin Yang ),( Dae Hyun Kim ),( Bo Sik Choi ),( Hyeong Uk Ju ),( Neung Hwa Park ),( Byung Uk Lee ),( Jae Ho Park ),( Seok Won Jung ),( In Du Jeong ),( Sung-jo Bang ) 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1
Aims: Daclatasvir/asunaprevir (D/A) combination therapy has approved as a first interferon free oral regimen for chronic hepatitis C in Korea. D/A combination therapy has shown a high virological response for chronic genotype 1 hepatitis C virus (HCV) infected patients in clinical trials and real world data of Japanese. In the present study, we analyzed the real world efficacy and the safety of D/A combination therapy for patients with (HCV) in metropolitan city Ulsan. Methods: We retrospectively analyzed clinical data of chronic HCV genotype Ib patients treated with D/A combination therapy at five hospitals in the metropolitan city Ulsan. Of 146 patients treated with D/A combination therapy, 117 patients completed treatment were included in safety and efficacy analysis. Results: D/A combination therapy was the first-line treatment for 64 (54.7%) patients. 44 (37.6%) patients were null responders or relapsers of previous interferon treatment and nine patients (7.7%) were found to be intolerant of interferon. Fifty two (44.4%) patients exhibited cirrhotic change. Sustained virologic response at 12 weeks (SVR 12) rate was 90.6% (106//117) overall, 93.87% the treatment- naive group, 86.4% in the treatment-failure group, and 88.9% in the treatment-intolerant group. SVR12 rates for patients with and without cirrhosis were 86.5% and 93.8%, respectively (p>0.05). SVR was achieved in 89.2 % of patients aged order 65 years and 92.4 % of younger 65 years. There was no significant difference in SVR12 rate (86.2% vs 97.8%) between high viral load (HCV RNA > 80,000 IU/mL) group and low viral load group. Adverse treatment-related events were reported in 00 (17.1%). One patient stopped drug due to severe general weakness and died from aspiration pneumonia. Conclusions: D/A combination therapy combination treatment should be considered as a safe and effective treatment option for genotype 1 HCV-infected patient.
동심원 등가풍속을 이용한 대기안정도에 따른 풍력자원 변화에 관한 연구
류건화(Geon-Hwa Ryu),김동혁(Dong-Hyeok Kim),이화운(Hwa-Woon Lee),박순영(Soon-Young Park),유정우(Jung-Woo Yoo),김현구(Hyun-Goo Kim) 한국태양에너지학회 2016 한국태양에너지학회 논문집 Vol.36 No.1
The power production using hub height wind speed tends to be overestimated than actual power production. It is because the hub height wind speed cannot represent vertical wind shear and blade tip loss that aerodynamics characteristic on the wind turbine. The commercial CFD model WindSim is used to compare and analyze each power production. A classification of atmospheric stability is accomplished by Monin-Obukhov length. The concentric wind speed constantly represents low value than horizontal equivalent wind speed or hub height wind speed, and also relevant to power production. The difference between hub height wind speed and concentric equivalent wind speed is higher in nighttime than daytime. Under the strongly convective state, power production is lower than under the stable state, especially using the concentric equivalent wind speed. Using the concentric equivalent wind speed considering vertical wind shear and blade tip loss is well estimated to decide suitable area for constructing wind farm.
CFD를 이용한 등가풍속 산정과 대기안정도에 따른 연안풍력단지 발전량 변화 연구
류건화 ( Geon Hwa Ryu ),김동혁 ( Dong Hyeok Kim ),이화운 ( Hwa Woon Lee ),박순영 ( Soon Young Park ),김현구 ( Hyun Goo Kim ) 한국환경과학회 2016 한국환경과학회지 Vol.25 No.2
To predict annual energy production (AEP) accurately in the wind farm where located in Seongsan, Jeju Island, Equivalent wind speed (EQ) which can consider vertical wind shear well than Hub height wind speed (HB) is calculated. AEP is produced by CFD model WindSim from National wind resource map. EQ shows a tendency to be underestimated about 2.7% (0.21 m/s) than HB. The difference becomes to be large at nighttime when wind shear is large. EQ can be also affected by atmospheric stability so that is classified by wind shear exponent (α). AEP is increased by 11% when atmosphere becomes to be stabilized (α > 0.2) than it is convective (α < 0.1). However, it is found that extreme wind shear (α > 0.3) is hazardous for power generation. This results represent that AEP calculated by EQ can provide improved accuracy to short-term wind power forecast and wind resource assessment.