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"주택용 BESS에 적용하기 위한 재활용 셀의 성능에 관한 연구"
김필중,양성수 한국전기전자학회 2024 전기전자학회논문지 Vol.28 No.1
"주택용 BESS에 적용하기 위한 재활용 셀 성능을 파악하기 위해 지난 5년 동안 사용한 셀을 선택하였다. 시험에 사용된 셀의 기본사양은 공칭 전압이 3.7[V], 공칭 용량이 2,200[mAh], 충전 전압이 4.05[V], 연속방전전류가 1[C](2,200[mA]), 연속충전전류가0.5[C](1,100[mA]) 이다. 새 셀의 경우 내부저항은 21.3±1[mΩ]인데, 재활용 셀의 경우 평균 내부저항이 25.38[mΩ]로 나타나 약19.1[%] 상승하였다. 충ㆍ방전 용량은 새 셀에 비해 약 18.9~19.3[%] 정도 낮게 나타났다. 내부저항과 충ㆍ방전 용량이 셀의 노화에 상호 밀접하게 연관되어 있으므로 BESS에 적용할 셀은 초기 내부저항보다 1.5배 이하이고 70[%] 이상의 충ㆍ방전 용량 성능을갖는 제품을 사용할 필요가 있다." "To determine the performance of recycled cells for application to residential BESS, cells used over the past 5 years were selected. The basic specifications of the cell used in the test are nominal voltage of 3.7[V], nominal capacity of 2,200[mAh], charging voltage of 4.05[V], continuous discharge current of 1[C](2,200[mA]), continuous charging current of 0.5[C](1,100[mA]). For new cells, the internal resistance was 21.3±1[mΩ], but for recycled cells, the average internal resistance was 25.38[mΩ], an increase of about 19.1[%]. The chargeㆍdischarge capacity was approximately 18.9~19.3[%] lower than that of a new cell. Because internal resistance and chargeㆍdischarge capacity are closely related to cell aging, cells to be applied to BESS need to use products with an initial internal resistance of 1.5 times or less and a chargeㆍdischarge capacity performance of 70[%] or more."
김필중,김상하 충남대학교 기초과학연구소 1996 忠南科學硏究誌 Vol.23 No.2
Good performance of the data link layer which is using sliding window protocol requires selection of optimal timeout duration. Timeout duration can be selected based on RTT. But, due to the variable environmental factors of channels, selection of optimal timeout duration is not easy task. This paper suggests additional method that can be used to identify frame loss even before timeout occurs. Using this additional method(called Fast Retransmission method), sender detects transmission error on a certain frame early and retransmits the frame immediately without further waiting for timeout event. This method loosen up the requirement of stringent timeout value on data link layer and gives the performance quite closed to the one that can be obtained with optimal timeout value.
고집적 메모리의 yield 개선을 위한 전기적 구제회로
김필중,김종빈 한국전기전자재료학회 2000 전기전자재료학회논문지 Vol.13 No.4
Electrical repair method which has replaced laser repair method can replace defective cell by redundancy’s in the redundancy scheme of conventional high density memory. This electrical repair circuit consists of the antifuse program/read/latch circuits, a clock generator a negative voltage generator a power-up pulse circuit a special address mux and etc. The measured program voltage of made antifuses was 7.2~7.5V and the resistance of programmed antifuses was below 500 Ω. The period of clock generator was about 30 ns. The output voltage of a negative voltage generator was about 4.3 V and the current capacity was maximum 825 $mutextrm{A}$. An antifuse was programmed using by the electric potential difference between supply-voltage (3.3 V) and output voltage generator. The output pulse width of a power-up pulse circuit was 30 ns ~ 1$mutextrm{s}$ with the variation of power-up time. The programmed antifuse resistance required below 44 ㏀ from the simulation of antifuse program/read/latch circuit. Therefore the electrical repair circuit behaved safely and the yield of high densitymemory will be increased by using the circuit.
화일 정보를 효율적으로 제공하는 화일 화인더의 구조 설계
김필중,김상하 충남대학교 기초과학연구소 1995 忠南科學硏究誌 Vol.22 No.1
One of the most compelling problems facing local area networks is the location information of resources on the networks. This paper explores the network architecture of file finders which is suitable for retrieving the resource information efficiently. Each network file finder is composed of four functions: registration, management, retrieval, and network functions. The communication between network file finders may be required to get the correct resource information because all informations are distributed over them. This may cause the loop problem in which the service request may be routed to the request generator itself. This problem could be sloved by the spanning tree method in this paper.