생태계 기반 재난위험저감 (Ecosystem-based Disaster Risk Reduction; Eco-DRR)의 역할과 연구방안

김정욱,김형수,김수전,Kim, Jeong-Uk,Kim, Hyeong-Su,Kim, Su-Jeon 한국수자원학회 2020 물과 미래(한국수자원학회지) Vol.53 No.9

개인정보 침해위험이 이용의도에 미치는 영향에 대한 연구 - 국내은행의 스마트뱅킹 서비스 중심으로

김정욱,전영찬,Kim, Jeongwook,Jeon, Youngchan 한국품질경영학회 2017 품질경영학회지 Vol.45 No.3

Purpose: The purpose of this study is how personal information protection risks affect the intention to use domestic smart banking services. VAM(Value based Adoption Model) model is validated as a theoretical background, selecting ease of use, usefulness and perceived security as a benefit factor, and considers perceived cost, technical complexity, and risk of personal information leakage as a sacrifice factor. Methods: The method of this study used questionnaire survey to collect 365 data on suer's perception on smart banking services, and also performed a structural equation modeling method using by AMOS 23. Results: The result of this paper shows that all hypothesis are accepted statistically significant except 1 hypothesis. Conclusion: This research is concluded that perceived value is affected on statistically positive impact on ease of use, usefulness and perceived security, and negative impact on perceived cost and risk of personal information violation, not statistically technical complexity.

다양한 전해액을 적용한 전기이중층 커패시터의 고전압 특성 연구

김정욱,최승현,김점수,Kim, Jung Wook,Choi, Seung-Hyun,Kim, Jeom-Soo 한국전기화학회 2017 한국전기화학회지 Vol.20 No.2

높은 출력의 장점을 가지는 전기이중층 커패시터 (EDLC: electric double layer capacitors)는 이차 전지와 더불어 차세대 에너지 저장장치로서 각광받고 있으나 낮은 에너지 밀도로 인해 그 사용처가 제한적이다. 본 연구에서는 EDLC의 에너지 밀도 향상 방법 중의 하나인 고전압화 구현 시 적합한 전해액을 연구하기 위해 AN (acetonitrile)용매에 $SBP-BF_4$ (spirobipyrrolidinium tetrafluoroborate), $TEA-BF_4$ (tetraethylammonium tetraflouroborate), $EMI-BF_4$ (1-ethyl-3-methylimidazolium tetrafluoroborate)의 세가지 염을 각각 선정하여 다양한 전해액의 조성에 따른 전기화학 특성을 비교 평가하였다. LSV (linear sweep voltammetry)측정에서 1.5M SBP-BF4/AN 전해액은 넓은 전위영역에서 안정함을 보였고, 고전압의 환경 (3.0 V 이상)에서 다른 조합의 전해액들과 비교하여 가장 우수한 전기화학적 성능을 보였다. 또한, 장기적으로 안정적인 성능을 유지하기 위해 리튬이온전지시스템에서 기능성 첨가제 효과가 입증된 TMSP (tris(trimethylsilyl)phosphite) 첨가제를 적용 했을 때 고전압의 환경 (3.3 V)에서 10,000 cycle 후 93%의 높은 용량 유지율을 얻을 수 있었다. Electric double layer capacitors (EDLC: electric double layer capacitors) have drew attention as an energy storage device for the next generation because of their outstanding power capability and durability. But their usage is somewhat limited due to low energy density over secondary batteries. One of methods to improve the energy of EDLC is expanding the voltage window of cell operation by increasing the charge cut-off voltage. In this study, $SBP-BF_4$ (spirobipyrrolidinium tetrafluoroborate), $TEA-BF_4$ (tetraethylammonium tetraflouroborate) and $EMI-BF_4$ (1-ethyl-3-methylimidazolium tetrafluoroborate) in AN (acetonitrile) were selected to evaluate the possibility of application at high voltage environment. The LSV (linear sweep voltammetry) measurements showed that the 1.5M SBP-BF4/AN electrolyte was stable over a wide potential window and showed the best electrochemical performance compared to other combinations of electrolytes at high voltage environments (over 3.0 V). Furthermore, TMSP (tris(trimethylsilyl) phosphite) was applied to 1.5M SBP-BF4/AN in order to maintain stable performance at high voltage for the long period of time. The electrolyte with TMSP additive showed the capacity retention of 93% after 10,000 cycles at 3.3 V.

자연발생석면 분포지역의 효율적인 조사와 관리 방안

김정욱,정명채,김동진,전기석,이창환,Kim, Jeong-Wook,Jung, Myung-Chae,Kim, Dong-Jin,Jeon, Gee-Seok,Lee, Chang-Hwan 한국지하수토양환경학회 2011 지하수토양환경 Vol.16 No.6

This study presents a state of the art in evaluation on naturally occurring asbestos (NOA) areas and effective strategies for investigation and management of NOA areas in Korea. First of all, we defined and classified the NOA area as compiling various countries' regulations, then discussed the best methods for evaluation and management of NOA for reducing exposure of asbestos in the vicinity of NOA areas. According to the literature survey, a three-steps management strategy was suggested in this study. The first step is a confirmation stage of asbestos contamination possibility and the second step is an assessment stage of asbestos contamination using investigation, analysis, evaluation and reclamation. The final step is a following-up control stage. These three management steps for NOA area will give the maximum effectiveness of NOA control in Korea.

한강하구 수자원 보전 및 활용 방안

김정욱,주홍준,김형수,Kim, Jeong-Uk,Ju, Hong-Jun,Kim, Hyeong-Su 한국수자원학회 2018 물과 미래(한국수자원학회지) Vol.51 No.4

대학과 환경교육

김정욱,Kim, Jeong-Uk 한국대학교육협의회 1995 大學敎育 Vol.75 No.-

환경교육이란 단지 머리 속에서 아는 지식만이 아니라 환경을 살리기 위한 실천이 전제가 되는 교육이다. 우리 삶의 근본 바탕이 되는 물과 공기와 흙이 오염되는지 어떤지 아무 관심이 없고, 그 속에 사는 생물들이 오염 때문에 죽는지 사는지에도 흥미가 없으며, 그로 인하여 인류가 멸망하든지 어떻든지 상관않고 단지 배운 고급지식을 이용해서 자신이 편안하도록 돈만 벌겠다는 사람들을 대학에서 교육시킬 필요는 하나도 없다. 돈벌이가 되고 과학적인 업적이 되기 때문에 자연을 이용하고 새로운 물질과 제품을 개발하는 데는 온갖 연구를 다 하지만, 그에 따르는 책임과 윤리 교육은 전무하다. 그런 교육을 시키는 것보다는 차라리 인간을 무식한 채로 그대로 두는 것이 훨씬 낫다. 그러한 의미에서 환경교육은 대학교육 자체에 의미와 당위성을 부여하는 대단히 중요한 교육이라고 할 수 있다.

위팔두갈래근의 긴갈래와 짧은갈래의 팔굽관절 굽힘 각도에 따른 근활성도 분석

김정욱,박민철,Kim, Jeong-Wook,Park, Min-Chull 대한고유수용성신경근촉진법학회 2020 PNF and Movement Vol.18 No.1

Purpose: This study aimed to investigate the impact of resistance on the muscle activities of the long and short heads of the biceps brachii, according to the elbow angle in supination, and the difference in muscle activity between the long and the short heads. Methods: This study was conducted with 22 men in their 20s who voluntarily agreed to participate. With the glenohumeral joint neutral in a position of supination, the elbow angle was randomly moved to 0°, 30°, 60°, and 90°. Using an 8-channel surface EMG while the participants held a 2-kg. dumbbell, the muscle activities of the long and the short heads of the biceps brachii were measured. The measured data were statistically processed using SPSS for Windows 12.0. For the activities of the short and the long heads according to the angle, a one-way ANOVA was conducted, and subsequently, to check the results of an analysis of the difference between groups, an LSD post-hoc test was conducted. An independent t-test was used to compare the activities of the long head and the short head according to the angles. Results: The analysis of the impact of the load of the dumbbell at each elbow angle on the muscle activities of the long and short heads of the biceps brachii revealed significant differences in both heads (p < 0.05). The result of the post-hoc analysis showed significant differences in both heads at angles between 0° and 30°, between 0° and 60°, and between 0° and 90°. Analysis of the impact of the load of the dumbbell in supination on the muscle activities of the long and short heads showed a significant difference at the angle between 0° and 30° (p < 0.05). Conclusion: The long head of the biceps brachii mainly acts in supination; however, in supination at elbow-bending angles of 60° and 90°, there was no difference in muscle activity between the short head and the long head.

지구 생태계에 있어서의 물의 역할

김정욱,Kim, Jeong-Uk 한국상하수도협회 1987 水道 Vol.38 No.-

조사연구 - 건축음향잔향실의 확산판 설치 및 음장보정

김정욱,Kim, Jeong-Uk 한국화재보험협회 2011 방재기술 Vol.51 No.-

일반적인 체외수정 방법과 세포질내 정자주입술로 얻어진 배아의 동결-융해 후 이식의 결과

김정욱,한미현,변혜경,전진현,손일표,궁미경,백은찬,강인수,이호준,Kim, Jeong-Wook,Han, Mi-Hyun,Byun, Hye-Kyung,Jun, Jin-Hyun,Son, Il-Pyo,Koong, Mi-Kyoung,Paik, Eun-Chan,Kang, Inn-Soo,Lee, Ho-Joon 대한생식의학회 1997 Clinical and Experimental Reproductive Medicine Vol.24 No.1

Intracytoplasmic sperm injection (ICSI) recently has been utilized widely as the most successful technique to overcome the unfertilization problem in cases of severe male infertility in couples who could not be treated by conventional IVF. Recently, indications of ICSI have been extended further and more fertilized oocytes become available. Thus, it is necessary to examine the efficiency of freezing the surplus embryos obtained from ICSI. We compared the survival rate and the future outcome of cryopreserved embryos obtained either after conventional IVF or ICSI during the same period. After ICSI or IVF, five best-quality embryos from each patient were transferred in the stimulation cycle and the surplus pronuclear (PN) stage oocytes or multicellular embryos were cryopreserved by slow freezing protocol with 1,2-propanediol (PROH) as a cryoprotectant. A total of 792 embryos from ICSI trial were thawed and 65.2% (516/792) survived. The survival rates of PN stage oocyte, multicellular embryo and PN + multicellular embryo were 63.5%, 68.2%, 64.0%, respectively. After 111 transfers, 34 pregnancies were achieved, corresponding to a clinical pregnancy rate of 30.6% per transfers. We thawed 1033 embryos from IVF trials and 57.5% (594/1033) survived. In IVF cycle, the survival rates of PN stage oocyte, multicellular embryo and PN + multicellular embryo were 58.2%, 65.2%, 40.2%, respectively. Thirty eight clinical pregnancies were established after 134 transfers, corresponding to a pregnancy rate of 28.4% per transfer. The cleavage rate of thawed PN stage oocytes from ICSI trial (61.3%) was significantly higher than those from conventional IVF (53.4%). The developmental rates of good embryo (${\geqq}$ grade II) in thawed PN stage oocytes obtained from conventional IVF and ICSI were 63% and 65%, respectively. We concluded that PN stage oocytes, multicellular embryos resulting from ICSI procedure can be successfully frozen/thawed with reasonable clinical pregnancy rates comparable to those of IVF.