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정원빈(Wonbin Jung),김범수(Beomsoo Kim),임원식(Wonsik Lim),차석원(SukWon Cha) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Most passenger cars equipped with automatic transmissions use torque converter lock-up clutch to reduce fuel consumption. and recently the slip control scheme of torque converter lock-up clutch is widely studied for expansion of the operating region of torque converter lock-up clutch and thus for the further improvement of the fuel economy of vehicles. In this paper, the analysis of the torque converter clutch is performed. Especially analysis of lock-up clutch system is performed using various friction models including Tanh model, Kamopp model, Dahl model, LuGre model and reset / integrator model. Out of them, this paper intensively compares Tanh model, Kamopp model and reset / integrator model. And finally a new model for control of lock-up clutch system is proposed.
최원빈,구현지,정경혜,김은영,유승훈,이민택,정선영 한국임상약학회 2023 한국임상약학회지 Vol.33 No.3
Background & Objectives: Fixed-dose combinations (FDCs) offer advantages in adherence and cost-effectiveness compared to free combinations (FCs), but they can also complicate the prescribing process, potentially leading to therapeutic duplication (TD). This study aimed to identify the prescribing patterns of FDCs for dyslipidemia and investigate their associated risk of TD. Methods: This was a retrospective cohort study involving drugs that included statins, using Health Insurance Review & Assessment Service- National Patient Sample (HIRA-NPS) data from 2018. The unit of analysis was a prescription claim. The primary outcome was TD. The risk ratio of TD was calculated and adjusted for patient, prescriber, and the number of cardiovascular drugs prescribed using a multivariable Poisson model. Results: Our study included 252,797 FDC prescriptions and 515,666 FC prescriptions. Of the FDC group, 46.52% were male patients and 56.21% were aged 41 to 65. Ezetimibe was included in 71.61% of the FDC group, but only 0.25% of the FC group. TD occurred in 0.18% of the FDC group, and the adjusted risk ratio of TD in FDC prescriptions compared to FC was 6 . 44 (95% CI 5 . 30-7. 82). Conclusions: Prescribing FDCs for dyslipidemia was associated with a higher risk of TD compared to free combinations. Despite the relatively low absolute prevalence of TD, the findings underline the necessity for strategies to mitigate this risk when prescribing FDCs for dyslipidemia. Our study suggests the potential utility of Clinical Decision Support Systems and standardizing nomenclature in reducing medication errors, providing valuable insights for clinical practice and future research.
김원빈,임수현,Hong Hyunsoo,정광일,On Seung Yoon,박성연,You Jun Il,Kim Seong Su 한국CDE학회 2022 Journal of computational design and engineering Vol.9 No.6
The application of polymer-based composite materials as bearing liner materials in eco-friendly water lubrication has received considerable attention owing to their superior tribological behaviors, corrosion resistance, and high damping characteristics, and their design flexibility can improve the bearing performances in response to the distribution of lubricant film pressure based on the regulation of elastic constants. However, the low viscosity and high density of water essentially cause thin-filmed lubrication accompanied by a low load-carrying capacity. Particularly, a high rotational speed enhancing the wedge effect induces turbulence and considerable inertial effect. Moreover, substantial elastic deformation of the composite bearing liners alters the formation of the lubricant film. In this study, we analyze a water-lubricated composite journal bearing system incorporating the turbulence, inertial effect, and elastic deformation of the bearing liner. Reynolds equation was modified considering the turbulence and inertial effect. The elastic deformation of the composite bearing liner was determined by solving the constitutive equation. The Reynolds equation and the constitutive equation were solved via the finite difference method and finite element method, respectively. In addition, the analytical relation for the elastic deformation was derived that suitably eliminated the requirement of solving the constitutive equation. With the introduction of the primary parameters, Sommerfeld number, Reynolds number, and deformation coefficient, the relation of the normalized minimum film thickness with respect to the parameters was modeled based on the Gaussian regression model. Accordingly, we proposed the new optimal maximum load-carrying capacity boundaries that narrowed down the operating region compared to conventional boundaries.
신봉기,정원빈 한국토지공법학회 2024 土地公法硏究 Vol.107 No.-
국문초록 이미 수년 전부터 도시개발제도는 초기 도시개발의 주안점이던 양적인 성장을 넘어 친환경적이고 질적 성장을 중심으로 발전하고 있다. 이러한 흐름 속에 약 20년전부터 등장했던 구릉지 개발과 역세권을 하나로 묶어 재개발하는 ‘결합개발제도’의 등장은 그 당시 아주 큰 주목과 학계의 관심을 받으면서, 부족한 지자체 재정을 극복하고 지금껏 국내 도시개발 문제를 해결할 수 있는 새로운 제도로 기대를 모으기도 하였다. 이러한 제도적 뒷밭침으로 탄생한 성남 대장동·제1공단 결합 도시개발사업(이하 ‘대장동사업’)은 도시개발법상 결합개발규정 적용을 시도한 첫 사례이다. 따라서 사회적, 정치적 화두이면서도 토지공법적 측면에서도 고찰의 대상으로써 대장동 사례를 통하여 결합개발사업에 대한 개괄적으로 살펴볼 필요성이 있다고 하겠다. 이에 본고에서는 결합개발제도의 본래 취지와 결합개발 제도가 적용된 몇가지 사례와 선행연구를 분석함으로써, 결합개발제도가 가지고 있는 본질적인 문제점을 찾아내고, 또 이를 개선 할 수 있는 부분을 찾아내어 본 제도가 나아갈 방향을 제시하고자 한다. Abstract Since many years ago, the paradigm of urban development has been aimed at future-oriented eco-friendly urban development that avoids consumption urban development that expands cities quantitatively and qualitatively regenerates existing cities. In this trend, the emergence of a "Conjoint Renewal Program, CRP" which is likely to realize both hilly and stationary development, a hot topic of domestic urban development, drew keen attention from working-level officials and academia related to the public and private sectors at the time, and raised expectations as a new system that could overcome insufficient local government finances and solve domestic urban development problems. Since then, the combined urban development project of the Daejang-dong and First Industrial Complex in Seongnam (hereinafter referred to as the "Daejang-dong Project") is the first case of attempting to apply the combined development regulations under the Urban Development Act. it is necessary to examine the Conjoint Renewal Program through the case of Daejang-dong as an object of consideration in terms of land construction, despite being a social and political topic. Therefore, this paper analyzes the original purpose of the Conjoint Renewal Program, CRP and the case plan to which the Conjoint Renewal Program is applied to predict the problems of the system and the system that can occur when applied in practice, and finds areas that can be modified and supplemented to suggest improvement directions.
외골격 로봇을 위한 마찰전기 기반의 자체 에너지 하베스팅이 가능한 복합재료 스프링
홍현수,정광일,김원빈,조현성,온승윤,정재문,김성수 대한기계학회 2023 大韓機械學會論文集A Vol.47 No.5
사람의 움직임을 보조하기 위해 사람이 직접 착용하는 외골격 로봇은 재활, 군사, 레저, 제조업 등 다양한 분야에서 많은 관심을 받고 있다. 본 연구에서는 자체 에너지 하베스팅이 가능한 복합재료 구조를 제작하고, 이를 외골격 로봇의 발목 스프링으로 적용하였다. 자체 에너지 하베스팅 복합재료 구조는 전도성 스킨 역할을 하는 탄소 섬유 강화 복합재료와 마찰전기 코어 역할을 하는 알루미늄과 PTFE로 구성되어 있다. 진동 가진기를 이용하여 다양한 주파수에 따른 자체 에너지 하베스팅 복합재료 시편의 출력 전압을 분석하였다. 또한 자체 에너지 하베스팅 복합재료 스프링을 제작한 후 이를 외골격 로봇의 발목 스프링으로 장착하여, 신체의 움직임에 따라서 탄성에너지를 저장 및 방출하는 동시에 자체 에너지 하베스팅 기능으로부터 전기에너지를 도출할 수 있음을 확인하였다.