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소산입자동역학과 분자동역학을 이용한 3D 프린터용 PEEK 분말에 대한 온도에 따른 미시적 구조변화에 대한 연구
김남원(Namwon Kim),이태일(Taeil Yi) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.5
3D printing technology and its applications have grown rapidly in academia and industry. We consider a 3D printing system designed for the selective laser sintering (SLS) method, which is one of the powder bed fusion (PBF) techniques to build up the final product by layering sintered powder slices. Thermal distortion of printing products is a critical challenge in 3D printing. This study investigates temperature-dependent conformational behaviors of 3D printed samples of sintered poly-ether-ether-ketone (PEEK) powders using molecular dynamics simulations. The wear and chemical resistance properties of PEEK are understood, as it is a well-known biocompatible material used for implants. However, studies on physical phenomena at nanoscale in PEEK are rarely published in public. We simulate dissipative particle dynamics to elucidate how a cavity regime forms in PEEK at different system temperatures. We demonstrate how PEEK structures deform subject to the system temperature distribution.
Design of a back-to-back converter to simulate transient state of renewable sources
김남원(Namwon Kim),김상용(Sang-Yong Kim),이효근(Hyo-Guen Lee),황철상(Chulsang Hwang),김경훈(Gyeong-Hun Kim),서효룡(Hyo-Ryong Seo),박민원(Minwon Park),유인근(In-Keun Yu) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
This paper describes a design of grid-simulator for experiment of transient stability of grid-connected renewable energy system. A transient analysis of renewable energy system has been researched by a simulation, because direct connection of renewable energy system and real utility is dangerous and it is hard to produce the transient grid condition. If a grid-simulator is used in the transient stability experiment, the transient grid condition might be generated easily with reference data and there is no impact on the grid. The grid-simulator composed of a back-to-back converter was designed and simulated with PSCAD/EMTDC to verify its operational characteristics.
Real time simulation and analysis techniques for Jeju power system using RTDS
김경훈(Gyeong-Hun Kim),김진근(Jin-Guen Kim),이효근(Hyo-Guen Lee),김남원(Namwon Kim),황철상(ChulSang Hwang),김상용(Sang-Yong Kim),서효룡(Hyo-Rong Seo),배형택(Hyeong-Teak Bae),박정도(Jung-Do Park),이동영(Dong-Young Yi),이상진(Sangjin L 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
A new high voltage direct current (HVDC) system from Jindo-to-Seojeju and 80 ㎿ wind farms will be installed in Jeju-island in the near future. The real time simulation for Jeju power system is needed for analysing newly installed systems in advance. This paper provides real time simulation techniques for Jeju power system using a real time digital simulator (RTDS). Simulation results show the frequency and power output variations under variable wind speed patterns of each wind farm.
서효룡(Hyo-Ryong Seo),김남원(Namwon Kim),이효근(Hyo-Guen Lee),황철상(Chulsang Hwang),김상용(Sang-Yong Kim),김경훈(Gyeong-Hun Kim),박민원(Minwon Park),유인근(In-Keun Yu) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
The output power from renewable energy sources fluctuates because of weather variations. This paper proposes an effective power quality control strategy of renewable energy source-based dispersed power generation system using photovoltaic (PV) system and supercapacitor. A supercapacitor is connected to the DC bus of PV power generation system for power quality control of the grid-connected renewable energy source-based dispersed power generation system. The results of simulation using PSCAD/EMTDC demonstrate the effectiveness of the proposed method. The proposed system reduces the fluctuations of grid-connected renewable power system and improves the utilization of PV system.
Jinsoo Park(박진수),Namwon Kim(김남원),Minjung Choi(최민정),Zhe Jin(김철),Youngseok Choi(최영석) 한국지능정보시스템학회 2011 지능정보연구 Vol.17 No.4
Since the ambitious declaration of the vision of the Semantic Web, a growing number of studies on semantic search have recently been made. However, we recognize that our community has not so much accomplished despite those efforts. We analyze two underlying problems : a lack of a shared notion of semantic search that guides current research, and a lack of a comprehensive view that envisions future work. Based on this diagnosis, we start by defining semantic search as the process of retrieving desired information in response to user’s input using semantic technologies such as ontologies. Then, we propose a classification framework in order for the community to obtain the better understanding of semantic search. The proposed classification framework consists of input processing, target source, search methodology, results ranking, and output data type. Last, we apply our proposed framework to prior studies and suggest future research directions.
DC BUS-based integrated control scheme of distributed energy resources for improving power quality
Chul-Sang Hwang(황철상),Namwon Kim(김남원),Minwon Park(박민원),In-Keun Yu(유인근),Gyeong-Hun Kim(김경훈),Gilsung Byeon(변길성),Jin-Hong Jeon(전진홍),Eung-Sang Kim(김응상),Changhee Cho(조창희) 한국조명·전기설비학회 2016 한국조명·전기설비학회 학술대회논문집 Vol.2016 No.5
김상용(Sang-Yong Kim),김남원(Namwon Kim),황철상(Chulsang Hwang),이효근(Hyo-Guen Lee),김경훈(Gyeong-Hun Kim),서효룡(Hyo-Ryong Seo),박민원(Minwon Park),유인근(In-Keun Yu) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
Converter per photovoltaic module (CPM) system has been researched to increase the efficiency of photovoltaic (PV) power generation system. The stability and efficiency of PV system might be different according to the connection structure of CPMs. Differences between series and parallel connection of CPMs for PV power generation system were analyzed in this paper. Boost type CPM was used to control maximum power of each PV module. CPMs were connected in series, and parallel to compare the PV output power according to the converter connection. More effective connection of CPMs is proposed by the simulation considering abnormal operation of converter of the PV system.
Development and real-time analysis of a RTDS component for lead-acid battery
이효근(Hyo-Guen Lee),김경훈(Gyeong-Hun Kim),김남원(Namwon Kim),김상용(Sang-Yong Kim),서효룡(Hyo-Ryong Seo),황철상(Chulsang Hwang),박정도(Jung-Do Park),이동영(Dong-Young Yi),이상진(Sangjin Lee),박민원(Minwon Park),유인근(In-Keun Yu) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
The advantages of lead-acid battery are relatively low expense, long life span, durability, and the commercial availability of the technology. The battery component for real time simulator has not been provided yet. This paper develops a RTDS (Real Time Digital Simulator) component for lead-acid battery and analyses in real time. The component of lead-acid battery is modeled with characteristics of charging and discharging, SOC (State Of Charge), and temperature. The real time simulation results of the model component are very close to the real lead-acid battery property. This component will be applied to the battery energy storage system for analysis of operational characteristics.