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A New MDR-based RFID System Architecture for Ubiquitous Computing Environment
정동원,이이섭,Jeong Dongwon,Lee Lee-Sub 한국시뮬레이션학회 2005 한국시뮬레이션학회 논문지 Vol.14 No.4
유비쿼터스 컴퓨팅은 무수히 많은 센서들이 관련 데이터 처리 시스템들과 또는 센서들 간의 정보 공유를 통해 서비스를 제공하면서 특정한 장치나 위치에 구애받지 않고 사용자들이 서비스를 이용할 수 있도록 해 준다. 이 논문에서는 유비쿼터스 환경하에서 현재 가장 활발하게 활용되고 있는 RFID(Radio Frequency IDentification) 시스템이 지니는 문제점을 정의하고 이를 극복할 수 있는 새로운 RFID 시스템 구조를 제안한다. 현재의 RFID 시스템은 특정 분야에만 한정하여 단순히 미리 주어진 태그의 식별자를 통해 대상을 식별하는 응용만으로 그 활용성이 제한되어 있다. 이 논문에서는 이러한 제한된 현재의 RFID 시스템의 문제점을 해결하고 유비쿼터스 환경에 적합한 활용성을 극대화할 수 있는 MDR(Metadata registry) 기반의 RFID 시스템 구조를 제안한다. 제안된 시스템은 특정 응용 분야에 종속되지 않고 다양한 분야와의 원활한 연계성을 제공한다. 또한 새로운 정보의 의미를 동적으로 처리할 수 있기 때문에 보다 넓은 응용 범위를 제공한다.
경로 예측 알고리즘의 빠른 투영 후보 선택을 위한 경로 단편 관리 구조
정동원(Dongwon Jeong),이석훈(Sukhoon Lee),백두권(Doo-Kwon Baik) 한국정보과학회 2015 정보과학회논문지 Vol.42 No.2
이 논문에서는 기존 경로 예측 알고리즘의 처리 속도를 향상시킬 수 있는 개선된 투영 후보 선택 알고리즘을 제안한다. 지금까지 다양한 사용자 이동 경로 예측 알고리즘이 개발되었으나 실시간 근거리예측 환경에 적합하지 않다. 이러한 문제점을 해결하기 위해 새로운 예측 알고리즘이 제안되었으나 몇 가지 문제점을 지닌다. 특히 보다 빠른 처리 속도를 제공할 수 있도록 개선되어야 한다. 기존 예측 알고리즘의 높은 처리 시간의 주된 원인은 투영 후보 선택 연산의 높은 시간 복잡도이다. 따라서 이 논문에서는 기존 투영 후보 선택 알고리즘의 처리 속도를 개선할 수 있는 새로운 경로 단편 관리 구조와 향상된 투영 후보 선택 알고리즘을 제안한다. 또한 비교 평가를 통해 이 논문에서 제안한 알고리즘이 효과적임을 보인다. This paper proposes an enhanced projection candidate selection algorithm to improve the performance of the existing path prediction algorithm. Various user path prediction algorithms have previously been developed, but those algorithms are inappropriate for a real-time and close user path prediction environment. To resolve this issue, a new prediction algorithm has been proposed, but several problems still remain. In particular, this algorithm should be enhanced to provide much faster processing performance. The major cause of the high processing time of the previous path prediction algorithm is the high time complexity of its projection candidate selection. Therefore, this paper proposes a new path fragment management structure and an improved projection candidate selection algorithm to improve the processing speed of the existing projection candidate selection algorithm. This paper also shows the effectiveness of the algorithm herein proposed through a comparative performance evaluation.
온도 성층화를 갖는 예혼합압축자기착화엔진에서 부스터 효과에 관한 수치해석
정동원(Dongwon Jeong),임옥택(Ocktaeck Lim),백영순(Youngsoon Baek) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The method of thermal stratification in cylinder is known for reducing rate of pressure rise, but which has its limit to extend the higher-load operating region of HCCI engines, giving an output of insufficient IMEP. High fueling rate could be one way to get the enough IMEP but it could be occurring engine knock. This work investigates the potential of in-cylinder thermal stratification for reducing the rate of pressure rise in DME HCCI engines, and the coupling between thermal stratification and booster effect to get reduced rate of pressure rise as well as high IMEP. The computations were conducted using Senkin application of the CHEMKINII kinetics rate code, and kinetic mechanism for Di-Methyl Ether (DME). DME has unique 2 stage reaction called Low Temperature Reaction (LTR) and High Temperature Reaction (HTR). Due to the heat release from LTR, the thermal stratification of in-cylinder would be formed just before HTR with large temperature difference so the heat release from oxidation reaction dispersed through combustion process. Intensity of intake pressure is closely concerned in input calorie which means a higher IMEP would be appeared without high fueling rate. The study also shows that increasing the in-cylinder thermal width of the charge between each zone would allow the booster pressure to be raised from 0.1 ㎫ to 0. 18㎫ to get the higher IMEP as well as high thermal efficiency with low emissions.
온도 성층화를 갖는 예혼합압축자기착화엔진에서 Booster 효과에 관한 수치해석
정동원(Dongwon Jeong),권오석(Oseock Kwon),임옥택(Ocktaeck Lim),박규열(Kyuyeol Park) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
The method of thermal stratification in cylinder is known for reducing rate of pressure rise, but which has its limit to extend the higher-load operating region of HCCI engines, giving an output of insufficient IMEP. High fueling rate could be one way to get the enough IMEP but it could be occurring engine knock. This work investigates the potential of in-cylinder thermal stratification for reducing the rate of pressure rise in DME HCCI engines, and the coupling between thermal stratification and booster effect to get reduced rate of pressure rise as well as high IMEP. The computations were conducted using Senkin application of the CHEMKINll kinetics rate code, and kinetic mechanism for Di-Methyl Ether (DME). DME has unique 2 stage reaction called Low Temperature Reaction (LTR) and High Temperature Reaction (HTR). Due to the heat release from LTR, the thermal stratification of in-cylinder would be formed just before HTR with large temperature difference so the heat release from oxidation reaction dispersed through combustion process. Intensity of intake pressure is closely concerned in input calorie which means a higher IMEP would be appeared without high fueling rate. The study also shows that increasing the in-cylinder thermal width of the charge between each zone would allow the booster pressure to be raised from 0.1㎫ to 0.18㎫ to get the higher IMEP as well as high thermal efficiency with low emissions.
분산화와 개방성 기반의 메타데이터 레지스트리 확장 모델
정동원(Dongwon Jeong) 한국정보기술학회 2020 한국정보기술학회논문지 Vol.18 No.1
This paper proposes an extended model for resolving the problems of the existing metadata registry model. ISO/IEC 11179—Metadata registries is an international standard that has been developed to improve data interoperability. The metadata registry model provides a centralized metadata management and closed metadata verification scheme, and thus the use of the model compromises extensibility and usability. This paper analyzes the limitations of the existing metadata registry management scheme and proposes an extended metadata registry model to address the limitations. The extended model proposed in this paper enables a decentralized management and open participation. This paper also shows a possible implementation model to realize the proposed model, and a comparative evaluation and the advantages of the proposed model are described.
실내공간 저농도 CO<sub>2</sub> 포집을 위한 알칼리 함침 정전나노섬유 연구
정동원 ( Dongwon Jeong ),김상범 ( Sangbum Kim ),조영민 ( Youngmin Jo ) 한국공업화학회 2018 공업화학전망 Vol.21 No.4
Carbon nanofibers were electrospun from melamine-blended polyacrylonitrile (MACNFs), for improved indoor level CO<sub>2</sub> removal of the fibrous adsorbent. The dopant (melamine) was used to provide free and basic nitrogen functionalities, as well as to shorten the fabrication time of the nanofibers. Upon final CO<sub>2</sub> activation of the nanofibers, the specific surface area and microporosity were enhanced. As per chemical properties, the surface basicity was improved through the significant tethering of pyridone. The sample, MACNF-7 (10 mL polymer solution doped with 0.7 g melamine) provides the optimum doping ratio to achieve the highest CO<sub>2</sub> adsorption capacity of 3.15 mmol/g. This performance was based on simultaneous and just-adequate improvement of the microporosity (physical) and surface basicity (chemical) of the adsorbent. However, the selective adsorption of CO<sub>2</sub>, in a binary mixture with nitrogen, showed the predominance of the improved chemical properties over microporosity; the highest CO<sub>2</sub> selective capture (1.22 mmol/g) was exhibited by applying CO<sub>2</sub> : N<sub>2</sub> of 0.15 : 0.85., with the selectivity fold of 58.19 at 273 K. In a 5-fold regeneration test, a stable and robust performance was achieved throughout the five cycles.