Li₂O Co-Sputtering을 통한 비정질 LLZO 고체전해질의 전기화학 특성 평가

박준섭,김종헌,김현석,Park, Jun-Seob,Kim, Jong-Heon,Kim, Hyun-Suk 한국재료학회 2021 한국재료학회지 Vol.31 No.11

As the size of market for electric vehicles and energy storage systems grows, the demand for lithium-ion batteries (LIBs) is increasing. Currently, commercial LIBs are fabricated with liquid electrolytes, which have some safety issues such as low chemical stability, which can cause ignition of fire. As a substitute for liquid electrolytes, solid electrolytes are now being extensively studied. However, solid electrolytes have disadvantages of low ionic conductivity and high resistance at interface between electrode and electrolyte. In this study, Li₇La₃Zr₂O₁₂ (LLZO), one of the best ion conducting materials among oxide based solid electrolytes, is fabricated through RF-sputtering and various electrochemical properties are analyzed. Moreover, the electrochemical properties of LLZO are found to significantly improve with co-sputtered Li₂O. An all-solid thin film battery is fabricated by introducing a thin film solid electrolyte and an Li₄Ti₅O₁₂ (LTO) cathode; resulting electrochemical properties are also analyzed. The LLZO/Li₂O (60W) sample shows a very good performance in ionic conductivity of 7.3×10^-8 S/cm, with improvement in c-rate and stable cycle performance.

한국인의 안정위시 상악중절치 노출량에 관한 연구

박준섭,류재준,Park, Jun-Seob,Ryu, Jae-Jun 대한심미치과학회 2004 Journal of the Korean Academy of Esthetic Dentistr Vol.13 No.1

This study is intended to provide a referable information of exposed amount of maxillary central incisor of Korean by ages and gender under rest position. The result of this study will give guidelines for making prothesis. The subjects of this study are patients of Charmgoun Dental Hospital in Busan, Korea. A statistical analysis was conducted after taking digital photos of patients' teeth with a ruler and measuring the length of teeth on the computer program. The results of this study were as follows : 1. The length of maxillary central incisor that exposed under upper lip is decreased by increasing age in rest position.; the average length is 3.455mm in 20s, 2.525mm in 30s, and 1.543mm in 40s. 2. The exposal length in females is more than males, average length is 2.796mm in female and 2.342mm in male. However, there is not significant difference between the genders. 3. The exposed average length of maxiallry central incisor under upper lip is 2.618mm at rest. 4. The clinical crown average length of maxillary central incisor is 10.195mm, but incresing age, there is no significant defference. 5. There is significant difference between the genders in the clinical crown length of maxillary central incisor.; the length is 10.637mm in men, 9.90mm in women.

척추 골관절염 환자에서의 골밀도와 골다공증성 척추골절의 빈도와의 관계

박준섭 ( Jun Sup Park ),주영실 ( Yeong Shil Joo ),최윤선 ( Yun Sun Choi ),정명아 ( Myeong A Cheong ),하형근 ( Hyung Keun Ha ),정인수 ( In Su Jung ),김시민 ( Si Min Kim ),김병준 ( Byoung Joon Kim ),안규정 ( Kyu Jeung Ahn ),최영길 ( 대한류마티스학회 2003 대한류마티스학회지 Vol.10 No.1

Objective: To investigate the association between bone mineral density (BMD) and osteoporotic compression fractures in radiographic spinal osteoarthritis (OA) patients. Methods: Subjects were 382 female patients (ages 45 to 85) from outpatient clinic for osteoporosis and rheumatic diseases. BMD was measured at lumbar spine and hip by dual X-ray absorptiometry (Hologic QDR 2000). The standard anteroposterior and lateral plain radiographs of thoracic and lumbar spine were taken to define spinal OA and vertebral compression fractures. Radiographic spinal OA was defined by grade of disc degeneration and facet joint degeneration. Frequency of vertebral fractures was compared between spinal OA and control patients in relation to their BMD, age, weight, body mass index (BMI) and years post menopause. Results: Higher proportion of fracture cases were observed in spinal OA patients than non-spinal OA patients (34.1%, 44/129 vs. 18.2%, 46/253, p<0.001) despite comparable mean BMD (0.836±0.152 vs. 0.834±0.185, p=0.89) and older mean age (65.8±8.5 vs. 57.8±10.3, p<0.001). In subjects of ages from 65 to 74, spinal OA patients showed significantly higher BMD than non-spinal OA patients (0.784±0.125 vs. 0.719±0.119, p=0.007), but the frequency of fractures seems to be higher than that of non-spinal OA patients (44.9%, 22/50 patients vs. 34%, 19/55 patients, p=0.58). When all study subjects were stratified according to their spine BMD (normal, osteopenia, and osteoporosis), significantly higher proportion of vertebral compression fractures was noted in spinal OA than non-spinal OA patients in osteopenia group (38.5% vs. 13.5%, p<0.001). Conclusion: Higher BMD does not seem to be translated directly into decreased risk of osteoporotic compression fractures in spinal OA patients. Careful assessment of risk factors for osteoporotic fractures and newer methods for assessing bone strength in this group of patients are needed.

SNS 정보공유를 통해 퍼지는 뉴스 분류 및 수집을 위한 도구

박준섭(Junsep Park ),이웅희(Woonghee Lee),김영훈(Younghoon Kim) 한국정보과학회 2018 한국정보과학회 학술발표논문집 Vol.2018 No.6

자기변형재료의 특성을 이용한 로터

박준섭(J. S. Park),박영우(Y. W. Park),오옥균(O. K. Oh) 한국정밀공학회 2012 한국정밀공학회 학술발표대회 논문집 Vol.2012 No.5월

중국 장애인 사회복지정책에 관한 연구

박준섭(Park, Joonsub) 한국공공사회학회 2015 공공사회연구 Vol.5 No.1

중국은 13억이라는 인구를 보유하고 있는 인구대국이며, 동시에 전 세계에서 장애인이 가장 많은 나라이기도 하다. 8천만 명에 이르는 장애인 사회복지 문제를 해결하기 위해 중국정부는 1990년에 『장애인보장법』을 제정하여 장애인 권익보장을 위한 법적 기반을 마련하였다. 또한 1994년에는『장애인교육조례』, 2007년에는 『장애인취업조례』를 시행함으로써 사회활동에서 배제되고 있는 장애인들의 교육 및 취업문제 해결에 나섰다. 그러나 이러한 다양한 정책 시도에도 불구하고 중국의 장애인 사회복지에는 여전히 다양한 문제점을 내포하고 있다. 이 연구는 중국의 장애인 복지 실태를 검토하고 그 문제점을 파악함으로써 사회적 차별과 편견으로 늘 소외되었던 장애인의 사회복지 정책방향을 제시하였다. 구체적으로 첫째, 기존의 시혜적 이념으로부터 탈피하여 평등, 참여, 공생이라는 장애인 사회복지 이념을 재정립해야 한다. 둘째, 세부적이고 체계적인 장애인 사회복지 법률체계를 강화해야 한다. 셋째, 중앙정부와 지방정부, 민간단체가 협력하여 장애인 사회복지 재정지원을 확대해야 한다. 넷째, 맞춤형 복지정책을 통해 도·농 및 지역격차를 완화시켜야 한다. 다섯째, 시민교육을 활성화시켜 장애인에 대한 인식을 개선해야 한다. 여섯째, 장애인의 교육 및 취업기회를 확대하여 그들이 적극적으로 사회활동에 참여하도록 유도해야 한다. China is a great population country which has 1.3 billion mass of people, at the same time, it has most handicapped people in the world. According to resolve handicapped social welfare problem, China government legislated 『The handicapped Security Act』that became the base for guarantee of rights and interests on 1990. Furthermore, China conducted 『The handicapped education ordinance』on 1994 and 『The handicapped employment ordinance』on 2007 to resolve social problem related to neglected handicapped from society. In spite of thous various trying, China handicapped welfare program still has a lots of problem. This study inspects actual situation of China handicapped social welfare policy and takes related problem to suggest social welfare policy direction for handicapped who is not being taken from society. Specifically, First, redefine social welfare idea including equality, participation and symbiosis as taking original dispensation idea away. Second, intensify handicapped social welfare system detailed and systematic. Third, expand social welfare financial aid cooperating central government, local government and a private institution. Forth, relax gap between urban and rural through customized welfare policy. Fifth, improve awareness of handicapped as vitalizing civil education. Sixth, induce handicapped to participate in social activity giving them education opportunity and employment opportunity.

에어제트를 이용한 웨이퍼 표면 입자 세정 효과에 대한 연구

박준섭(Joonsub Park),이정훈(Jeonghoon Lee) 대한기계학회 2020 大韓機械學會論文集B Vol.44 No.9

반도체 패키지 공정의 외관 검사 설비 내부에 설치된 에어제트의 유량에 따른 부유성 입자 세정효율에 대하여 실험적으로 고찰하였다. 웨이퍼 강제 오염 평가와 기류 해석을 통해 부유성 입자 세정에 가장 영향을 미치는 인자를 확인하여 최적 조건을 도출하였으며 세정 효율 최적 조건을 얻을 수 있는 방법에 대해 제시하였다. 에어제트 유량을 증가시킬수록 웨이퍼 표면의 입자 세정 효율은 65%까지 상승하다 유지되는 경향을 보였다. 기류 해석 결과, 에어제트와 주변 기구물과의 거리에 따라 웨이퍼 표면 유속이 증가되어 입자 세정 효과가 더욱 우수해지는 것을 확인하였다. 에어제트와 vision 기구물 간의 거리를 최적화한 결과 입자 세정 효율이 최소 10%에서 최대 89%로 나타났으며 실제 양산 공정에 적용한 결과 제품 수율이 급격히 상승함을 확인하였다. This study investigates the cleaning efficiency of floating particles for the flow rate of the air jet installed inside a vision inspection equipment in a production line of a semiconductor package. Parameters affecting the removal of floating particles were determined by an assessment for forcedly polluted particles on wafer and flow analysis for the air jet. Furthermore, these were utilized to find the optimal conditions for an efficient cleaning mechanism. Based on the results, it was observed that as the air jet flow rate increased, the removal rate of floating particles from the wafer surface increased and was maintained at a certain level (65 as a removal efficiency). Numerical analysis allowed us to find optimum conditions and additional parameters for the distance between the air jet and the vision inspection equipment, which helps identify the cleaning mechanism of wafer surface. The cleaning efficiency has been improved from at least 10 % to 89 % depending on the distance between the air jet nozzle and the vision inspection equipment. Based on the results of this experiment, this method was applied to actual mass production process. Consequently, the product yield was found to be dramatically improved; additionally, the quality of appearance was improved in the final products.

Kromasil HPLC 칼럼을 이용한 Ibuprofen의 분리특성 연구

박준섭(Joon Sub Park),김병립(Byung Lip Kim),윤태호(Tae Ho Yoon),김인호(In Ho Kim) 한국생물공학회 2005 KSBB Journal Vol.20 No.3

Separation of Ibuprofen Enantiomers by SMB(Simulated Moving Bed) Chromatography

Joon Sub Park(박준섭),In Ho Kim(김인호) 한국생물공학회 2005 한국생물공학회 학술대회 Vol.2005 No.10

자기변형원리를 이용한 회전운동의 구현

박영우(Young-Woo Park),박준섭(Jun-Seop Park),오옥균(Ok-Kyun Oh) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12