의과대학의 임상실습공간에 관한 건축계획 연구

최광석 ( Choi¸ Kwangseok ) 한국의료복지건축학회 2021 의료·복지 건축 Vol.27 No.4

Purpose: This study summarized architectural planning data for clinical practice spaces for CPX/OSCE and Simulation spaces, through analysis of domestic and foreign literature and a survey of domestic colleges of medicine. Methods: This study analyzed the architectural planning elements of the clinical practice spaces of the college of medicine, through a literature review on the clinical practice space and the survey of four recently established colleges of medicine. Results: ① It is desirable to plan the floor plan type for Simulation and CPX/OSCE spaces as a corridor-separated type that separates the circulations between students and staff (faculty). ② The simulation area arranges their practice rooms around the control space where the circulation of the staff is made. Conversely, it is desirable to arrange the CPX/OSCE rooms around the test waiting room where students enter. ③ It is desirable to separate access to the staff and students to allow student control, and to install various support spaces facing the staff corridor to secure the movement of equipment and the flow of evaluators. ④ In the simulation area, the equipment stored in the storage must be set in each room before the practice according to the setting of delivery or surgery like, and the equipment that has been removed must be back, so the circulation is short and does not intersect with the student circulations. ⑤ Debriefing rooms, seminar rooms, etc. are arranged in the staff area for review and discussion of clinical situations where practice and evaluation have been completed. Implications: It is important to configure an appropriate movement system and spatial zoning for each space for simulation and CPX/OSCE.

의과대학의 학습 및 학습공유공간에 관한 건축계획 연구

최광석 ( Choi¸ Kwangseok ) 한국의료복지건축학회 2021 의료·복지 건축 Vol.27 No.3

Purpose: This study identified the planning trends for formal and informal learning spaces in the college of medicine through literature reviews. And then, by the analysis of the actual condition of existing domestic facilities, It was organized the architectural planning baseline data and future directions for the formal and informal learning spaces in the college of medicine. Methods: This study was conducted using literature reviews on the existing medical education method and learning space planning. Subsequently on-site surveys and questionnaires were conducted at existing facilities. Results: In the past, learning space of the college of medicine was considered only a formal learning space such lecture rooms, labs. But lately it has been turned into a total learning concept that embraces shared learning spaces such as libraries, student spaces, amenities and common spaces such as lobbies and hallways. ① Formal learning spaces are composed of teaching and practice areas. Since It is the basic functions that comprise the college of medicine, this paper conducted a functional analysis based on the current operating system of the College of Medicine and provided baseline data on architectural planning such as function, layout, zoning, and detailed planning. ② The informal learning sharing space was divided into a library area and a student well-being and convenience area to analyze the real conditions of domestic medical college. In addition, by comparing the trends and differences in foreign medical colleges identified by literature analysis, this paper summarizes the need to revitalize informal learning spaces and their integration into formal learning spaces, architectural planning considerations, etc. Implications: the evolution of the learning method and the flexibility of the learning space bring about changes in the learning space.

Development of a Human-Like Learning Frame for Data-Driven Adaptive Control Algorithm of Automated Driving

Kwangseok Oh,Sechan Oh,Jongmin Lee,Kyongsu Yi 제어로봇시스템학회 2021 제어로봇시스템학회 국제학술대회 논문집 Vol.2021 No.10

This paper proposes a human-like learning frame for data-driven adaptive control algorithm of automated driving. Generally, driving control algorithms for automated vehicles need environment information and relatively accurate system information like mathematical model and system parameters. Because there are unexpected uncertainties and changes in environment and system dynamic, derivation of relatively accurate mathematical model or dynamic parameters information is not easy in real world and it can have a negative impact on driving control performance. Therefore, this study proposes data-driven feedback control method for automated driving based on human-like learning frame in order to address the aforementioned limitation. The human-like learning frame is based on finite-memory like human and is divided into two parts such as control and decision parts. In the control part, it is designed that feedback gains are derived based on least squares method using saved error states and gains in finite-memory. And the control input has been computed using the derived feedback gains. After control input is used for driving control, it is designed that current error states and the used feedback gains are saved in the finite-memory real-time in the decision part if the time-derivative of cost function has a negative value. If the time-derivative of the cost function has greater than or equal to zero, it is designed that the feedback gains are updated using gradient descent method with sensitivity estimation and the used error states and gains are saved in the memory as a new data. The performance evaluation has been conducted using the Matlab/Simulink and CarMaker software for reasonable evaluation.

Resistance Changes of Pr0.7Ca0.3MnO3 Films Deposited Through rf-Magnetron Sputtering

Kwangseok Lee,Junghyun Sok,Kyoungwan Park,Seungwoo Han 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.3

In this paper, the resistance-change behavior of a perovskite material was studied. In particular, Pr0.7Ca0.3MnO3 (PCMO) films were deposited on a Pt bottom electrode by using an rf-magnetron sputtering system. The PCMO films showed a resistance-switching behavior at room temperature. They were then deposited at 300 C with dierent oxygen flow rates, and the deposited films were post-annealed at various temperatures in an O2 or N2 atmosphere. The ratio of the resistance change of the post-annealed PCMO films in the high-resistance state to that in the low-resistance state in an O2 atmosphere turned out to be much larger than that of the post-annealed films in a N2 atmosphere. The electrical properties of the PCMO films were also significantly aected by the top electrode. The resistance changes of the Ag/PCMO/Pt device turned out to be larger than those of the Au/PCMO/Pt device. It can, therefore, be concluded that the O2 content and the top electrode improve the electroresistance.

A 9 bit, 1.12 ps Resolution 2.5 b/Stage Pipelined Time-to-Digital Converter in 65 nm CMOS Using Time-Register

KwangSeok Kim,WonSik Yu,SeongHwan Cho IEEE 2014 IEEE journal of solid-state circuits Vol.49 No.4

<P>In this paper, a 2.5 b/stage pipelined time-to-digital converter (TDC) is presented. For pipelined operation, a novel time-register is proposed which is capable of storing, adding and subtracting time information with a clock signal. Together with a pulse-train time-amplifier, a 9-bit synchronous pipelined TDC is implemented, which consists of three 2.5 b/stage TDCs and a 3 b delay-line TDC. A prototype chip fabricated in 65 nm CMOS process achieves 1.12 ps of time resolution at 250 MS/s while consuming 15.4 mW. Compared to other high-resolution state-of-the-art TDCs, the proposed pipelined TDC achieves the best figure-of-merit (FoM) without any calibration.</P>

Characteristics of Si Nano-Crystal Memory

Kwangseok Han,Ilgweon Kim,Hyungcheol Shin 대한전자공학회 2001 Journal of semiconductor technology and science Vol.1 No.1

An Investigation on Steering Optimization for Minimum Turning Radius of Multi-Axle Crane Based on MPC Algorithm

Kwangseok Oh,Jaho Seo,Jinho Kim,Kyongsu Yi 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10

The study investigates on the optimized steering wheel angle for minimum turning radius of all-terrain crane by applying a model predictive control (MPC) strategy. For this, the simplified linear bicycle model and error dynamic model are firstly derived for the crane with a multi-axle steering system. Then, MPC controller is designed with an optimal objective function to minimize the vehicle dynamic error for minimum turning radius. The minimum turning radius and corresponding optimized steering angle at different vehicle speeds are analyzed in the MATLAB/Simulink environment.

Construction of the hospital reservation management system based on cloud computing

Kwangseok Choi,Suil Boo,Cheolhun Na 한국정보통신학회 2016 2016 INTERNATIONAL CONFERENCE Vol.8 No.1

Recently, due to the development of information communication technology, the medium to large medical institutions have been interested in the use of IT technology which can provide various services to external clients. Especially the cloud computing technology made it possible to provide not only the patient’s medical information, but the services such as appointment, schedule management, and health information in hospitals. In this paper, we present the effective network construction methods for a hospital information system based on the cloud computing. Particularly with considering the factors affecting the traffic in the SaaS (Soft as a Service) type hospital information system, we present an efficient design scheme of SaaS-type doctor’s appointment management system.

Sensitivity-based model-free adaptive displacement and velocity control algorithms for unknown single-input multi-output systems with recursive least squares

Kwangseok Oh,서자호 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.11

This study presents sensitivity-based adaptive model-free adaptive displacement and velocity control algorithms for unknown single-input multi-output (SIMO) systems using recursive least squares (RLS) with exponential forgetting. Nonlinearities in real-world systems make predictions of the dynamic behaviors of systems challenging and have a negative influence on the performance of control systems. To address this problem, the sensitivity-based model-free adaptive control algorithm, which does not require a mathematical model of a system, is proposed in this study. In the algorithm, a feedback control law for a SIMO system was designed with multiple adaptive feedback gains. The virtual function that represents the relationship between multiple feedback gains and control errors was also designed to construct an adaptation rule with a linear combination. The coefficients in the virtual function were estimated in real-time using RLS with multiple exponential forgetting factors. By using the estimated coefficients, the adaptation rule for feedback gains with the gradient descent method was designed, which can be automatically adjusted through applying Lyapunov’s direct method. The performance of the proposed model-free adaptive control algorithm was evaluated in an actual DC motor system under angular displacement and velocity tracking control scenarios. Evaluation results show that the designed control algorithm enables the system to track the desired output successfully without system modeling.

Regorafenib prevents the development of emphysema in a murine elastase model

Kwangseok Oh,Gun-Wu Lee,Han-Byeol Kim,Jin Hee Park,Eun-YoungShin,Eung-GookKim 생화학분자생물학회 2023 BMB Reports Vol.56 No.8

Emphysema is a chronic obstructive lung disease characterized by inflammation and enlargement of the air spaces. Regorafenib, a potential senomorphic drug, exhibited a therapeutic effect in porcine pancreatic elastase (PPE)-induced emphysema in mice. In the current study we examined the preventive role of regorafenib in development of emphysema. Lung function tests and morphometry showed that oral administration of regorafenib (5 mg/kg/day) for seven days after instillation of PPE resulted in attenuation of emphysema. Mechanistically, regorafenib reduced the recruitment of inflammatory cells, particularly macrophages and neutrophils, in bronchoalveolar lavage fluid. In agreement with these findings, measurements using a cytokine array and ELISA showed that expression of inflammatory mediators including interleukin (IL)-1β, IL-6, and CXCL1/KC, and tissue inhibitor of matrix metalloprotease-1 (TIMP-1), was downregulated. The results of immunohistochemical analysis confirmed that expression of IL-6, CXCL1/KC, and TIMP-1 was reduced in the lung parenchyma. Collectively, the results support the preventive role of regorafenib in development of emphysema in mice and provide mechanistic insights into prevention strategies.