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리튬이온 배터리용 다층박판 금속의 초음파 용착시 용착강도
김진범(Jin-Bom Kim),서지원(Ji-Won Seo),박동삼(Dong-Sam Park) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.6
As a significant technology in the smartization era promoted by the Fourth Industrial Revolution, the secondary battery industry has recently attracted significant attention. The demand for lithium-ion batteries (LIBs), which exhibit excellent performance, is considerably increasing in different industrial fields. During the manufacturing process of LIBs, it is necessary to join the cathode and anode sheets with thicknesses of several tens of micrometers to lead taps of the cathode and anode with thicknesses of several hundreds of micrometers. Ultrasonic welding exhibits excellent bonding when bonded with very thin plates, such as negative and positive electrodes of LIBs, and dissimilar and highly conductive materials. In addition, ultrasonic welding has a small heat-affected zone. In LIBs, Cu is mainly used as the negative electrode sheet, whereas Cu or Ni is used as the negative electrode tab. In this study, one or two electrode sheets (t0.025 ㎜ Cu) were welded to one lead tab (t0.1 ㎜ Cu). The welding energy and pressure were used as welding parameters to determine the welding strength of the interface between two or three welded materials. Finally, the effects of these welding parameters on the welding strength were investigated.
α-galactosidase A 유전자 분석으로 확인된 Fabry 병
진범식 ( Bum Sik Chin ),김지인 ( Jee In Kim ),이진성 ( Jin Sung Lee ),홍순원 ( Soon Won Hong ),정현주 ( Hyun Joo Chung ),김희만 ( Hee Man Kim ),김동기 ( Dong Ki Kim ),구영석 ( Young Suck Goo ),이호영 ( Ho Yung Lee ) 대한신장학회 2002 Kidney Research and Clinical Practice Vol.21 No.6
Fabry disease is a X-linked lysosomal storage disorder caused by deficiency of α-galactosidase A. This abnormality in enzyme results intracellular accumulation of globotriaosylceramide and leads to severe painful neuropathy with progressive renal cardiovascular, and cerebrovascular dysfunction and early death. We report a 35 year-old man who had been suffered from acroparesthesia aggravated by body temperature elevation and with asymptomatic renal function impairment, which were proven to be due to Fabry disease. We performed gene analysis by PCR direct sequencing and confirmed missense mutation of GLA gene. Recently enzyme replacement of α-galactosidase was introduced and we think that the importance of early diagnosis and treatment should be emphasized.
울산광역시 장애인 구강건강증진을 위한 자원봉사 중심의 지속적 치과진료사업의 사례
김진범(Jin-Bom Kim),김병재(Byung-Jae Kim),한동헌(Dong-Hun Han),전은주(Eun-Joo Jun),김한나(Han-Na Kim),김민지(Min-Ji Kim) 대한치과의사협회 2015 대한치과의사협회지 Vol.53 No.11
The purpose of this study was to evaluate the oral health promotion of the disabled persons by voluntary dental services in Ulsan Metropolitan City. Two dentists taken a calibration training for national oral health survey examined the oral health status of 473 disabled persons from two special schools for the disabled children and adolescents, a residential facility and a gymnasium for the disabled persons in 2009-2010. The surveyed disabled persons in the age range was from 7 to 74 years old. Voluntary dentists, oral hygienists and other civilian volunteers had supplied with the oral health care services to the disabled persons at dental clinics of special schools for the disabled children and adolescents, and a dental clinic supported from Nam-Gu Public Health Center in Ulsan Metropolitan City since 1997. The obtained data from these surveys were analyzed with the SPSS statistical package. Among subjects aged 12-14 years, subjects with decayed, missing and filled teeth (DMFT) in permanent dentition was 46.9%; subjects with untreated decayed teeth, 17.2%. The number of decayed, missing and filled teeth in permanent dentition was 1.36. The proportion of decayed components of DMFT score was 28.00%; proportion of missing components of DMFT score, 1.43%; proportion of filled components of DMFT score, 70.57%. The proportion of filled components of DMFT score among disabled persons of all age group in Ulsan were evaluated to be a similar level to non-disabled citizens in Ulsan from 2010 Korean National Survey. The oral health care programs for disabled persons by voluntary services of dental professionals and other civilians are evaluated to be effective for the oral health promotion of disabled persons in Ulsan.
등가회로 모델을 사용한 배터리 셀의 동적 발열 특성 해석
김진범(Jin Beom Kim),박성배(Seong Bae Park),박일석(Il Seouk Park) 대한기계학회 2023 大韓機械學會論文集B Vol.47 No.6
높은 에너지 밀도를 갖는 고출력 배터리 모듈은 열폭주에 취약하므로 안전 온도를 유지하기 위한 냉각 시스템을 필요로 한다. 방열 설계에 앞서 모듈의 열적 거동을 예측하려면 입력 전류, 외기 온도, SoC(state of charge)에 따라 변화하는 셀의 발열량을 정확히 반영해야 한다. 전기화학 기반 수치해석의 높은 해석 비용을 감안하여 본 연구에서는 펄스 방전데이터로부터 특정 SoC의 저항 및 정전용량 변수들을 도출하여 전지 발열량을 예측하는 2차 등가회로 모델을 적용한 배터리 열해석을 수행하였다. 등가 물성치를 적용한 열전도 해석을 통해 다양한 C–rate의 정전류 방전 및 실제 전기차 주행 조건의 수치해석 결과를 실험 결과와 비교하였으며, 2차 등가회로 기반 열해석의 유효성을 분석하였다. High power battery modules with high energy density are vulnerable to thermal runaway. Therefore, a cooling system is required to maintain a safe temperature. To predict the thermal behavior of a module prior to designing for heat dissipation, the heat fluctuations generated in the cell based on the input current, ambient temperature, and SoC(state of charge) should be reflected precisely. Considering the high cost of numerical analysis of electrochemical cells, a thermal analysis of a battery was performed in this study using a secondary equivalent circuit model. This model predicts the amount of heat by deriving the resistance and capacitance variables of specific SoC from pulse discharge data. Using thermal conduction analysis, the results of numerical analysis under constant current discharge at various C-rates and actual electric-vehicle driving conditions were compared with the experimental results in terms of equivalent properties, and the effectiveness of the secondary equivalent circuit-based thermal analysis was analyzed.