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단단 축류압축기 유동해석에 대한 k-w 난류모델의 응용
이준석,김광용,Lee, Joon-Suk,Kim, Kwang-Yong 한국유체기계학회 2000 한국유체기계학회 논문집 Vol.3 No.3
A numerical study based on the three-dimensional thin-layer Navier-Stokes solver is carried out to analyze the flowfield through a single stage transonic compressor. Explicit fout-step Runge-Kutta scheme with spatially variable time step and implicit residual smoothing is used. The governing equations we discretized with explcit finite difference method. Mired-out average method is used at the interface between rotor and stator. And, an artificial dissipation model is used to assure the stability of solution. The results with k-w turbulence model were compared to the results with Baldwin-Lomax model, and physical phenomena of transonic compressor are presented. The two turbulence models give the results that show reasonably good agreements with experimental data.
한방병원에 내원한 위마비 및 비위마비성 기능성 소화불량증 환자에 대한 위 운동성 및 임상적 속성에 관한 연구
이준석,이선령,엄국현,김현경,장선영,유종민,김진성,류봉하,류기원,윤상협,Lee, Joon-Suk,Lee, Seon-Young,Eom, Guk-Hyeon,Kim, Hyun-Kyung,Jang, Sun-Young,Ryu, Jong-Min,Kim, Jin-Sung,Ryu, Bong-Ha,Ryu, Ki-Won,Yoon, Sang-Hyub 대한한방내과학회 2005 大韓韓方內科學會誌 Vol.26 No.4
Little is known concerning the pathophysiology and symptomatology of gastric dysmotility of patients who have sought treatment in eastern traditional medicine. The aim of this study was to investigate gastric electrical activity and clinical characteristics between gastroparesis and non-gastroparetic functional dyspepsia(FD) and assess the necessity to distinguish them for eastern traditional medical treatment. 60 patients were surveyed by questionnaire. Gastric electrical activity was recorded and analyzed using electrogas-trography. Patients were divided into gastroparesis and non-gastroparetic FD by 1.0 of power ratio. Healthy persons were used as reference. Postprandial normogastria of gastroparesis decreased and that of non-gastroparetic functional dyspepsia increased compared before and after meals. Suggested causes of onset were the meat diets that most patients were on in the gastroparesis group, and that drugs that patients in the non-gastroparetic FD group were taking. Distribution of main symptom was equally regular in patients with gastroparesis, but patients with non-gastroparetic FD showed mainly upper abdominal pain and fullness. Values for the gastroparesis group were double those for the non-gastroparesis FD group in frequency of upper GI endosopic examination. Results suggest that effective application of eastern traditional medical treatment requires that first a clear distinction be made in state of gastric dysmotility and clinical characteristics of gastroparesis and non-gastroparesis FD when treating dyspepsia.
흰쥐의 위(胃) 배출능(排出能)에 대한 반하사심탕(半夏瀉心湯)의 효능(效能)
이준석,김진성,류봉하,윤상협,Lee, Joon-Suk,Kim, Jin-Sung,Ryu, Bong-Ha,Yoon, Sang-Hyub 대한한방내과학회 2006 大韓韓方內科學會誌 Vol.27 No.2
Backgrounds & Objectives: Banhasasimtang granule(BHSST) has been used for the treatment of functional dyspepsia regarded as one of the gastric dysmotility disease. but its mechanisms of action are not well known yet: So we investigated the effects of BHSST on gastric emptying and its mechanisms of action in rats. Methods: Gastric emptying was measured by glass beads(1mm in diameter) expelled from the stomach for 60 min after administration of normal saline(NS) or BHSST 31mg/kg or 93mg/kg in rats. And by the same method gastric emptying was measured after administration of NS or BHSST 93mg/kg in rats treated with atropine sulfate(1mg/kg, s.c.), quinpirol HCI(0.3mg/kg, i.p.), NAME(NG-nitro-L-arginine methyl ester, 75mg/kg, s.c.) or cisplatin(10mg/kg, i.p.) to make delayed gastric emptying. Results: BHSST 93mg/kg improved gastric emptying more than NS or BHSST 31mg/kg(p=0.016). Under the delayed gastric emptying, BHSST 93mg/kg improved gastric emptying in the group treated with NAME$(5.00{\pm}3.101\;vs\;9.00{\pm}3.51,\;p\;=0.046)$, but aggravated it With atropine sulfate$(5.71{\pm}3.45\;vs\;2.57{\pm}1.62,\;p\;=0.050)$ and cisplatin$(12.7{\pm}2.29\;vs\;8.57{\pm}5.06,\;p\;=0.072)$. Conclusions: BHSST improves the gastric emptying through cholinergic and 5-hydroxytryptamine 3 receptors. Especially it is effective to improve gastric emptying delayed by NAME. So we expect that it would be effective in functional dyspepsia with impaired reservoir functions such as gastric adaptive relaxation.
2차원 관성 컨트롤러를 이용한 제스처 인식에 대한 연구
이준석(Joon-Suk Lee) 한국엔터테인먼트산업학회 2008 한국엔터테인먼트산업학회 학술대회 논문집 Vol.2 No.1
본 논문에서는 간단한 계산식으로 시스템에 부하를 주지 않고, 실시간 처리가 가능한 유클리디안 거리를 이용한 제스처 인식 시스템을 구현하였다. 구현된 제스처 인식 시스템의 성능을 확인하기 위하여 30회의 제스처 입력 실험을 진행하였고, 시스템에 대하여 잘 알지 못하는 5명의 사용자를 대상으로 간단한 사용법을 설명한 후 10회씩 입력 테스트를 수행하였다. 그 결과로 평균 84.48%의 인식률을 보였다.
이준석(Joon-Suk Lee),조용환(Yong-Hwan Cho) 한국엔터테인먼트산업학회 2008 한국엔터테인먼트산업학회논문지 Vol.2 No.2
본 연구에서는 기존 웹 포털 사이트의 콘텐츠 유용성, 페이지 디자인, 학습 용이성, 웹 기능성, 검색 정확도 등의 유용성 평가지표를 분석하여 그들 사이의 구조모형을 도출하였다. 이를 통해 요인들 간의 경로 관계나 구조적 모형이 각기 다른 웹 포털 사이트 간에 어떤 차이와 유사점을 보이는지 분석하고 이상적인 웹 포털 사이트의 구조 모델을 제안한다. 본 연구의 분석 결과를 요약하면 다음과 같다. 첫째, 웹 포털 사이트 간 판매되는 상품 콘텐츠에 따라 사용 연령층이 구분되어짐을 알 수 있다. 둘째, 특화된 주제를 서비스하는 포털 사이트의 구조와 다양한 콘텐츠를 서비스하는 포털 사이트의 구조적 차이점을 도출해 냈다. 마지막으로 각 표본이 되는 사이트에 대해 연구요인들의 관계를 분석하고 이상적인 구조모형을 도출한 후, 도출된 구조모형이 적용된 신생 웹 포털 서비스를 제안한다. In this paper, we deduce structure model between the facts such as usability index of Contents usability, Page design, Learnability, Web functionality, Seach accuracy, etc. of conventional web portal sites. According to this, we analyze similarity among the other web portal sites that has different path relation and structural model between the facts. The results of this research summarized as follows. First, the results show that user ages are differentiated by selling goods contents in web portal site. Second, we deduce structural difference of portal site that serve various contents and structure of portal site that serve specialized subject. Also we analyze relationships among research factors for sampled sites and deduce ideal structural model. Finally, we suggest new web portal service applied deduced structural model.
흡기 시스템이 공기유량계의 감지도에 미치는 영향에 관한 연구
이준석(joon Suk Lee),조영진(Youngjin Cho),박심수(Simsoo Park),한봉훈(Bong Hun Han) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
The air fuel ratio of current gasoline engine is mostly controlled by a hot film type mass air flow sensor and manifold absolute pressure sensor. For precise measurement of intake air flow rate, sensor manufacturers request enough duct length nearly 10 times of a duct diameter making a fully developed flow. But, mass produced vehicles have no enough space to install such a lengthy intake system. Therefore, the inserted duct or bell mouthed duct was applied to confirm the stable fully developed intake flow in an air cleaner assembly. Various duct configurations before mass air flow sensor effect the precision of HFM's sensibility, due to air flow patterns are influenced by the geometry of intake system. This study mainly focused on the geometry of intake systems which influence on real air mass flow measurement of HFM. Test results could be used as the present on the guideline for designing of a intake system.