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이승헌(Seunghun Lee),윤재석(Jaeseok Yun),류제하(Jeha Ryu),우운택(Woontack Woo) 한국정보과학회 2005 정보과학회논문지 : 소프트웨어 및 응용 Vol.32 No.4
본 논문에서는 사용자의 발걸음 정보를 이용하여 유비쿼터스 컴퓨팅 환경 중 가정과 같이 규모가 크지 않은 곳에서 사용자의 위치 추적 및 인식이 가능한 유비플로어 시스템을 제안한다. 유비쿼터스 환경에서 개인화 된 위치 기반 서비스를 제공하기 위해서는 사용자 및 위치 정보가 반드시 필요하다. 기존의 시스템은 이를 위해서 태그등의 센서를 휴대하거나 카메라등의 비접촉 센서를 사용하였다. 그러나 이들은 사용자에게 불편함을 주거나 주변 노이즈에 민감한 단점이 있다. 이를 극복하기 위해, 사용자가 걸을때의 지면 반력을 이용한 플로어-기반의 인증 시스템이 제안되었으나 시스템을 구성하는 센서와 주변 기기가 비싸다는 단점이 있다. 제안된 시스템은 싼 ON/OFF 스위치 센서들을 사용해 일상생활에서 걷는 사용자의 발걸음 패턴을 파악하여 사용자를 인증한다. 성인 남녀 10명을 대상으로 실험하여 평균 90% 의 인식률을 얻었으며, 사용자는 인증받기 위해 특별한 장치의 착용이나 특정한 행동을 취할 필요가 없다. We propose the ubiFloor system to track and recognize users in ubiquitous computing environments such as ubiHome. Conventional user identification systems require users to carry tag sensors or use camera-based sensors to be very susceptible to environmental noise. Though floor-type systems may relieve these problems, high cost of load cell and DAQ boards makes the systems expensive. We propose the transparent user identification system, ubiFloor, exploiting user's walking pattern to recognize the user with a set of simple ON/OFF switch sensors. The experimental results show that the proposed system can recognize the 10 enrolled users at the correct recognition rate of 90% without users' awareness of the system.
의료기기 내부 용혈 현상의 예측을 위한 난류 벽 모델의 적용
이승헌(Seunghun Lee),장민욱(Minwook Chang),강성원(Seongwon Kang),허남건(Nahmkeon Hur),김원정(Wonjung Kim) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
For medical devices with blood flows, analyzing and reducing hemolysis is a very important topic. The shear stress has been identified as the most important factor for the hemolysis. In turbulent flows, high shear stress values are concentrated near the wall. In case of predicting hemolysis numerically, this leads to a very fine mesh and large computational resource to predict hemolysis accurately. In order to resolve this issue, turbulence wall models are used widely to relax the grid requirements. However, there exists no turbulence wall model for predicting the hemolysis yet. Therefore, the purpose of this study is to develop a turbulence wall model for hemolysis. In order to decrease the numerical error of hemolysis prediction, the blood damage index (BDI) is calculated using different approaches in two divided regions. In a near-wall region, an analytic approach using a modeled velocity profile is used to reduce a numerical error from the sharp velocity gradient in a coarse grid resolution. The Van Driest equation is adopted as the model for the mean velocity profile. In a region far from the wall, a regular numerical discretization is applied. The effectiveness of the proposed wall model is assessed for a few turbulent flows such as the flows inside a channel and cannula. The predicted BDI values present that the proposed wall model shows a significantly improved grid convergence and accuracy compared to a fully numerical approach.
결절성 위염 환자의 임상적 특징과 헬리코박터 제균 치료
김성배 ( Sung Bae Kim ),이승헌 ( Seunghun Lee ),심재겸 ( Jae Kyeom Sim ),최연근 ( Yeonkun Choe ),조동호 ( Dong Ho Jo ),김준환 ( Joonhwan Kim ) 국군의무사령부 2019 대한군진의학학술지 Vol.50 No.1
Objective; Nodular gastritis (NG) is well-known endoscopic findings caused by Helicobacter pylori infected patients and related with diffuse-type gastric cancer. The aim of this study was to identify clinical characteristics of patients with NG in the armed forces and result of H.pylori eradication. Method; We reviewed 1062 patients who underwent upper gastroendoscopy between July 2016 and August 2018. We analyzed the clinical findings and H.pylori eradication results. Results; Total 39 (3.7%) patients diagnosed NG by endoscopy. Patients with age under 40 were associated with NG. Of the 39 patients with NG, H.pylori infection confirmed in 36 (92.3%). H.pylori eradication therapy including triple and sequential therapy successful in 83.3% patients. Conclusion; In patients with NG, h.pylori confirm test and eradication therapy is effective to improve patients symptom and prevent gastric cancer. To achieve this result, an integrated and effective patients tracking system is needed in miliary medicine.
발작성 심방 세동에서 지속성 심방 세동으로 진행 및 예후 예측인자
김지은 ( Ji Eun Kim ),이기홍 ( Ki Hong Lee ),이승헌 ( Seunghun Lee ),박혁진 ( Hyukjin Park ),김현국 ( Hyun Kuk Kim ),김성수 ( Sung Soo Kim ),정해창 ( Hae Chang Jeong ),조재영 ( Jae Yeong Cho ),박근호 ( Keun-Ho Park ),심두선 ( Doo 대한내과학회 2015 대한내과학회지 Vol.88 No.6
Background/Aims: Significant numbers of patients with paroxysmal atrial fibrillation (AF) proceed to persistent AF and have poor clinical outcomes despite the use of antiarrhythmic agents or direct-current cardioversion. We compared the CHADS2, CHA2DS2- VASc, and HATCH scoring systems to predict AF progression and prognosis and identify the most useful scoring system in Korea. Methods: A total of 559 consecutive patients with paroxysmal symptomatic AF were analyzed. The progression of AF and clinical outcomes were determined after at least 1 year of follow-up. Clinical outcomes were defined as the composite of death, hospitalization due to heart failure, and new-onset stroke. Each score was calculated, and its predictive accuracy for AF progression and prognosis was compared. Results: A total of 147 patients with paroxysmal AF (26.3%) proceeded to persistent AF. The HATCH score (area under the curve [AUC], 0.601; p < 0.001) was the most powerful scoring system for the prediction of AF progression, although the CHADS2 (AUC, 0.565) and CHA2DS2-VASc (AUC, 0.558) were also useful. The CHA2DS2-VASc (AUC, 0.734; p < 0.001) was the most powerful scoring system for the prediction of clinical outcomes with a more significant linear correlation (0: 3.3% vs. 1: 6.3% vs. 2: 15.4% vs. 3: 20.7% vs. 4: 18.0% vs. 5: 53.6% vs. ≥ 6: 55.6%, linear p < 0.001) than the CHADS2 (AUC, 0.720) and HATCH scoring systems (AUC, 0.723). Conclusions: Although the CHADS2, CHA2DS2-VASc, and HATCH scoring systems were useful predictors of progression from paroxysmal to persistent AF, the CHA2DS2-VASc score was the most useful and accurate for the prediction of clinical outcomes. (Korean J Med 2015;88:672-679)
무기체계 신뢰도 예측시 임무주기 적용 방안에 대한 연구
윤희성(Huisung Yun),정다운(DaUn Jeong),이은학(Eunhak Lee),강태원(Taewon Kang),이승헌(Seunghun Lee),허만옥(Manog Hur) 한국신뢰성학회 2011 신뢰성응용연구 Vol.11 No.4
Duty cycle is determined as the ratio of operating time to total time. Duty cycle in reliability prediction is one of the significant factors to be considered. In duty cycle application, non-operating time failure rate has been easily ignored even though the failure rate in non-operating period has not been proved to be small enough. Ignorance of non-operating time failure rate can result in over-estimated system reliability calculation. Furthermore, utilization of duty cycle in reliability prediction has not been evaluated in its effectiveness. In order to address these problems, two reliability models, such as MIL-HDBK-217F and RIAC-HDBK-217Plus, were used to analyze non-operating time failure rate. This research has proved that applying duty cycle in 217F model is not reasonable by the quantitative comparison and analysis.