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참여자의 기회주의 성향이 공급사슬 풀링 효과에 미치는 영향
정동진 ( Dongjin Jeong ),문성암 ( Seongam Moon ),최진우 ( Jinwoo Choi ) 한국로지스틱스학회 2020 로지스틱스연구 Vol.28 No.2
Pooling works when the needs of the participants are independent or exclusive. Those who remain in demand can fill those who lack. However, this study began by wondering what would happen if participants had opportunism in this pooling process. The hypothesis is that the opportunism of the participants reduces the pooling effect. Experiment and simulation were combined to test this hypothesis. The experiment confirmed that the subject had opportunism in the pooling situation. And the simulation confirmed the impact on pooling. After the morning sale was completed, the experiment subjects received help for afternoon sale by pooling. When pooling, the order quantity was checked for distortion in order to receive more. It is expected that phantom orders will increase when receiving an additional supply rather than a return. And the experiment was to see how much occurs. The overall pooling effect was measured by implanting the decision function found in the experiment into the simulation model. Pooling consists of one seller and two buyers. The effect is quantified by simulating the case that one buyer has opportunism and non-opportunism.
정동진(Jung Dongjin),정제창(Jeong Jechang) 한국방송·미디어공학회 2010 한국방송공학회 학술발표대회 논문집 Vol.2010 No.11
영상 압축은 멀티미디어 실시간 전송에 있어서 핵심적인 기술이다. 동영상 압축 기술 중 움직임 예측 부분은 가장 계산량이 많고 가장 복잡한 부분으로 실시간 전송을 위해서는 고속 알고리즘이 필요한 부분이다. 본 논문은 기존의 움직임 예측 알고리즘의 하나인 이진 블록 정합 움직임 예측 알고리즘 중 2bit 변환을 개선하여 더욱 빠른 알고리즘을 제안한다. 기존의 2bit 변환 알고리즘은 현재 프레임과 이전 프레임의 블록에 윈도우를 씌어 각 프레임의 윈도우에서 구한 평균과 표준편차를 가지고 각각 2bit 변환을 하였다. 그러나 본 논문은 현재 프레임과 이전 프레임의 블록에 윈도우를 씌우고 현재 프레임의 윈도우에서 구한 평균과 표준편차를 이전 프레임에 적용을 시켜 같은 평균과 표준편차를 이용하여 기존의 알고리즘을 개선한다. 제안하는 알고리즘은 계산량의 감소와 동시에 화질을 유지시킨다.
120℃ 고온 히트펌프용 자기 베어링 내장 무급유 원심 압축기 운전성능 평가
고희환(Heehwan Ko),정동진(Dongjin Jeong),임세명(Semyeong Lim),김경엽(Kyungyup Kim) 대한설비공학회 2019 설비공학 논문집 Vol.31 No.2
The compressor performance includes aerodynamic performance, thermal efficiency, operation reliability and durability. its performance is tested in view of its operational problem in the field. This paper describes on the aerodynamic performance evaluation and operation reliability test of the oil-free centrifugal compressor equipped with magnetic bearing for a high-temperature heat pump. Utilizing the experimental setup, we tested the centrifugal refrigerant compressor installed on closed loop high-temperature heat pump system, the test equipments and test results are presented. The required performance of the compressor was tested according to the test code like the ANSI/AHRI standard 550/590, ANSI/AHRI 540 and ASME PTC 10. As the results of the performance test, the process of finely adjusting the angle of the vaned diffuser was repeated to improve the compressor performance and compression ratio. The oil-free centrifugal refrigerant compressor with magnetic bearing showed superior durability than the refrigerant compressor with gas-foil bearing even in sudden and continuous surging. In order to increase the measurement accuracy, the heat balance relations were compared by measuring the refrigerant mass flow rate, pressurized water flow rate, steam generation amount, and power consumption of a motor. Currently, the durability tests are being conducted in order to respond the various needs for industrial use.