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이정국(Jung-Kuk Lee),김종대(Jong-Dae Kim),박찬영(Chan-Young Park),송혜정(Hae-Jung Song),김유섭(Yu-Seop Kim) 한국정보과학회 2011 한국정보과학회 학술발표논문집 Vol.38 No.1D
스마트 폰 애플리케이션에서 웹 문서의 정보를 가져와 정보를 제공하려면, 웹 문서를 파싱하여 알맞게 가공하는 것이 필요하다. API를 공개해 주는 웹 문서라면 간단하게 가공하여 서비스를 제공할 수 있지만, 많은 웹 문서들은 API를 제공해 주지 않기 때문에 HTML을 자체적으로 파싱하는 것이 불가피하다. 스마트 폰은 그 특성상 디스플레이의 크기가 작기 때문에 하나의 뷰에서 여러 개의 웹 문서를 파싱하여 정보를 한꺼번에 제공해야 하는 다중 연결문제를 가지고 있다. 또한 동시에 스마트 폰은 처리속도가 늦기 때문에 비동기적으로 스레딩 처리를 하는 과정에서 다중 연결의 순차적 과정은 동기식으로 처리해야하는 문제가 발생한다. 본 연구에서는 이와 같은 문제에 대한 해결책을 제시한다.
유항열(Hang-Youal Yoo),이정국(Jung-Kuk Lee),이금원(Keum-Won Lee),이준모(Jun-Mo Lee) 한국조명·전기설비학회 2004 한국조명·전기설비학회 학술대회논문집 Vol.2004 No.5월
Among various modern control theories, PID control has been well used for several decades. PID algorithms needs some tuning methods are used for selecting PID parameters. But in some cases various kinds of performance instead are used instead of well-known tuning rules, and so variable type of performance index must be tested so that controllers, output characteristics and disturbance rejection property meets some specifications. In this paper, linear conbinational type of performance using error signal, time, control input and robustness is used to the PID control of air conditioning system. By the 2 DOF PID parameters minimizing performance index, controllers, output characteristics and robustness properties are analyzed. Simulations are done with MATLAB m file and model files.
최현선(Hyun-Sun Choi),이정국(Jung Kuk Lee),유근봉(Keun Bong Yoo) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The failure of first stage bueket for 1300℃ class gas turbine was investigated by a visual inspection and a finite element analysis. The failure of a internal cooling passage was a critical cause on the separation of buckets segment and would cause the microstructural deterioration of the neighboring regions by a serious thermal load. Transmutation of microstructural morphologies of the damaged buckets under the thermal and mechanical stress was observed. After a coating stripping, the bucket surface condition was evaluated through a visual inspection and a finite element analysis. The TMF(thermal-mechanical fatigue) cracking of surface coatings in the suction side and pressure side of bucket was described.
인구기반 표준 코호트를 이용한 대장 내시경 후 천공 발생: 후향적, 환자-대조군 연구
김지우 ( Ji Woo Kim ),김수영 ( Su Young Kim ),최정혜 ( Jung Hye Choi ),김현수 ( Hyun-soo Kim ),이정국 ( Jung Kuk Lee ),김윤태 ( Yun Tae Kim ),박근우 ( Geunu Park ),강대용 ( Dae Ryong Kang ) 대한소화기학회 2019 대한소화기학회지 Vol.73 No.3
Background/Aims: Despite the many reports of colonoscopy complications worldwide, few studies have been performed at the population level in Korea. In this study, a population-based study was performed to evaluate the incidence of post-colonoscopy perforations compared to a control group. Methods: Between January 2011 and December 2011, data for all cases (age over 45) who underwent a colonoscopy were collected from National Health Insurance Service using a random sampling method. The clinical characteristics and perforation incidence (within 30 days after the colonoscopy) of cases were identified, and cases were then compared with controls who had not undergone a colonoscopy. Results: Among 1,380,000 subjects, 31,177 cases and 62,354 controls were identified. Perforation occurred in 14 patients (0.04%) in the case group and one patient (<0.01%) in the control group (RR, 28.0; 95% CI 3.7-212.9, p<0.001). Subgroup analysis was followed according to the endoscopic procedure, gender and age. In subgroup analysis, colonoscopy-associated perforations occurred more in the therapeutic procedure (RR, 26; 95% CI 1.46-461.46), male (RR, 50; 95% CI 2.96-844.41), and age of 45-60 years (RR, 30; 95% CI 1.71-525.23). Conclusions: A colonoscopy procedure is related to an increased risk of perforation at the population level. In addition, the therapeutic procedure, male, and