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강태원(Taewon Kang),서용석(Yongsug Suh),박현철(Hyeoncheol Park),강병익(Byungik Kang),김성훈(Simon Kim) 전력전자학회 2013 전력전자학회 논문지 Vol.18 No.1
This paper presents a simple and cost-effective stand-alone rapid battery charging system of 30kW for electric vehicles. The proposed system mainly consists of active front-end rectifier of neutral point clamped 3-level type and non-isolated bi-directional dc-dc converter of multi-phase interleaved half-bridge topology. The charging system is designed to operate for both lithium-polymer and lithium-ion batteries. The complete charging sequence is made up of three sub-interval operating modes; pre-charge mode, constant-current mode, and constant-voltage mode. The pre-charge mode employs the stair-case shaped current profile to accomplish shorter charging time while maintaining the reliable operation of the battery. The proposed system is specified to reach the full-charge state within less than 16min for the battery capacity of 8kWh by supplying the charging current of 78A. Owing to the simple and compact power conversion scheme, the proposed solution has superior module-friendly mechanical structure which is absolutely required to realize flexible power expansion capability in a very high-current rapid charging system.
Development of a Paper-Based Viscometer for Blood Plasma Using Colorimetric Analysis
Kang, Hyunwoong,Jang, Ilhoon,Song, Simon,Bae, Sang-Cheol American Chemical Society 2019 ANALYTICAL CHEMISTRY - Vol.91 No.7
<P>The viscosity of biofluids can be used to acquire meaningful medical information on the conditions of a patient but has seldom been utilized in clinical practices owing to cumbersome measurement procedures and the need for large sample volumes. We present a colorimetric method to measure the viscosity of blood plasma using a paper-based viscometer developed in this study specifically for clinical diagnosis. The proposed analytical device consists of multilayered papers with fluid-loading, -mixing, and -measuring regions, and it can be fabricated readily in a simple manner using three-layered paper channels and tape. Moreover, the colorimetric analysis enables viscosity estimations by analyzing a single optical image. To validate the device performance, we measured the viscosities of fluids such as glycerin aqueous solutions, bovine-serum-albumin solution, dimethyl sulfoxide, and blood plasma. We found that the measured viscosities were in good agreement with the reference values. Finally, we developed a simple smartphone application for the viscosity measurements that helped enhance the convenience and utility of the paper-based viscometer while maintaining the measurement accuracy.</P> [FIG OMISSION]</BR>
A Review on the Analysis and Experiment of Fluid Flow and Mixing in Micro-Channels
Simon Jayaraj,Sangmo Kang,Yong Kweon Suh 대한기계학회 2007 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.21 No.3
The studies with respect to micro-channels and micro-mixers are expanding in many dimensions. Most significant area of micro-mixer study is the flow analysis in various micro-channel configurations. The flow phenomena in microchannel devices are quite different from that of the macro-scale devices. An attempt is made here to review the important recent literature available in the area of micro-channel flow analysis and mixing. The topics covered include the physics of flow in micro-channels and integrated simulation of the micro-channel flow. Also, the flow control models and electro-kinetically driven micro-channel flows are dealt in detail. A survey of important numerical methods, which are currently popular for micro-channel flow analysis, is carried out. Different options for mixing in microchannels are provided, in sufficient detail.
Seungmin Kang,Sungmin Ryu,Simon Song 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.3
Vortex-induced vibration (VIV) based energy conversion is a promising methodology to generate electricity by utilizing the flow energy neglected and eventually dissipated in nature, as the power generation process is sustainable and free from emission of pollutants. In this vein, micro-scale energy convertors driven in low-Reynolds-number flows have caught the attention for engineering applications. As the performance of the convertors highly depends on the acting forces or VIV responses, VIV amplifications are necessary to elevate the power output or energy conversion efficiency toward a level of engineering practicability. The attachment of a pair of bumps on an elastically mounted circular cylinder was demonstrated as an effective way to elevate the energy output for VIV-based energy convertors. However, most of relevant studies were conducted for turbulent flows as high-capacity energy convertors are of significant interest for direct engineering applications. On the other hand, the effects of the bumps on the energy transfer have rarely been studied for low Reynolds number flows. This paper then aims to quantify the effects of the circumferential locations of a pair of bumps on the energy transfer ratio in a single circular cylinder VIV configuration for Reynolds number 150. The circumferential location of the bumps is optimized under the synchronization condition, and this is compared with the plain cylinder VIV configuration; the energy transfer ratio is appreciably elevated when the bumps are placed at θ = 60 or 75-degree.
Development of Mobile Platform Integrated with Existing Electronic Medical Records
김영아,김성수,Simon Kang,김경덕,김준 대한의료정보학회 2014 Healthcare Informatics Research Vol.20 No.3
Objectives: This paper describes a mobile Electronic Medical Record (EMR) platform designed to manage and utilize the existing EMR and mobile application with optimized resources. Methods: We structured the mEMR to reuse services of retrieval and storage in mobile app environments that have already proven to have no problem working with EMRs. A new mobile architecture-based mobile solution was developed in four steps: the construction of a server and its architecture; screen layout and storyboard making; screen user interface design and development; and a pilot test and step-by-step deployment. This mobile architecture consists of two parts, the server-side area and the client-side area. In the server-side area, it performs the roles of service management for EMR and documents and for information exchange. Furthermore, it performs menu allocation depending on user permission and automatic clinical document architecture document conversion. Results: Currently, Severance Hospital operates an iOS-compatible mobile solution based on this mobile architecture and provides stable service without additional resources, dealing with dynamic changes of EMR templates. Conclusions: The proposed mobile solution should go hand in hand with the existing EMR system, and it can be a cost-effective solution if a quality EMR system is operated steadily with this solution. Thus, we expect this example to be shared with hospitals that currently plan to deploy mobile solutions.