중학생의 진로체험이 자율적 학습동기와 자기주도학습에 미치는 영향: 진로개발역량의 매개효과

이민욱(Minwook Lee),이영민(Youngmin Lee),이미란(Miran Lee) 한국직업교육학회 2022 職業 敎育 硏究 Vol.41 No.1

이 연구의 목적은 중학생의 진로체험이 진로개발역량에 미치는 영향을 살펴보고, 진로개발역량이 자율적 학습동기와 자기주도학습에 미치는 영향을 확인하는데 있었다. 이 연구 목적을 달성하기 위하여 한국직업능력연구원의 2020년 ‘초·중등 진로교육 현황조사’ 중 중학생의 데이터를 활용하여 분석하였다. 주요 연구결과는 다음과 같다. 첫째, 중학생의 진로체험은 자율적 학습동기에 직접적인 영향을 주고 있는 것으로 나타났다. 둘째, 중학생의 진로체험은 진로개발역량에 직접적으로 긍정적인 영향을 주고 있는 것으로 나타났다. 셋째, 중학생의 진로체험은 자기주도학습에 직접적인 유의미한 영향은 없는 것으로 나타났다. 넷째, 중학생의 진로체험은 자율적 학습동기, 자기주도학습에 직접적으로 미치는 영향보다 진로개발역량을 매개로한 간접효과가 더 큰 것으로 나타났다. 이러한 연구결과를 토대로 중학생의 학습동기와 자기주도학습 수준을 높이기 위한 진로체험 운영에 대한 이론적 시사점을 제시하였다. The purpose of this study was to examine the effect of middle school students career experience on their career development competency, and to find the effect of career development competency on self-controlling learning motivation and self-directed learning. In order to achieve the purpose of this study, the data of middle and middle school students in the ‘2020 Elementary and Secondary Career Education Survey of the KRIVET was analyzed. The main research results were as follows. First, the career experience of middle school students had a direct influence on their self-controlling learning motivation. Second, it was found that middle school students career experiences had a direct positive effect on their career development competency. Third, it was found that the career experiences of middle school students had no direct significant effect on self-directed learning. Fourth, the career experience of middle school students had a greater indirect effect through career development competency than the direct effect on self-controlling learning motivation and self-directed learning. Based on the results of this study, theoretical implications to increase the level of middle school students’ the learning motivation and self-directed learning were suggested.

Astronomy experiments using digital instruments

Sang Hyun Lee,Kyung Hoon Lee,Enjung Lee,Joo Hyun Park,Kyu Bin Jang,Dongho Lee,Hyungyu Jo,MinWook Lee,Ga Hyung Kim,Minjun Ku,Jinwoo Seol,Dong Ju Kim,KangJin Kin,Gyutae Park,Do-Hoon Kim,Do Yun Kim,Sumin 한국천문학회 2016 天文學會報 Vol.41 No.1

Fabrication of high crystalline SnS and SnS₂ thin films, and their switching device characteristics

Choi, Hyeongsu,Lee, Jeongsu,Shin, Seokyoon,Lee, Juhyun,Lee, Seungjin,Park, Hyunwoo,Kwon, Sejin,Lee, Namgue,Bang, Minwook,Lee, Seung-Beck,Jeon, Hyeongtag IOP Pub 2018 Nanotechnology Vol.29 No.21

<P>Representative tin sulfide compounds, tin monosulfide (SnS) and tin disulfide (SnS<SUB>2</SUB>) are strong candidates for future nanoelectronic devices, based on non-toxicity, low cost, unique structures and optoelectronic properties. However, it is insufficient for synthesizing of tin sulfide thin films using vapor phase deposition method which is capable of fabricating reproducible device and securing high quality films, and their device characteristics. In this study, we obtained highly crystalline SnS thin films by atomic layer deposition and obtained highly crystalline SnS<SUB>2</SUB> thin films by phase transition of the SnS thin films. The SnS thin film was transformed into SnS<SUB>2</SUB> thin film by annealing at 450 °C for 1 h in H<SUB>2</SUB>S atmosphere. This phase transition was confirmed by x-ray diffractometer and x-ray photoelectron spectroscopy, and we studied the cause of the phase transition. We then compared the film characteristics of these two tin sulfide thin films and their switching device characteristics. SnS and SnS<SUB>2</SUB> thin films had optical bandgaps of 1.35 and 2.70 eV, and absorption coefficients of about 10<SUP>5</SUP> and 10<SUP>4</SUP> cm<SUP>−1</SUP> in the visible region, respectively. In addition, SnS and SnS<SUB>2</SUB> thin films exhibited p-type and n-type semiconductor characteristics. In the images of high resolution-transmission electron microscopy, SnS and SnS<SUB>2</SUB> directly showed a highly crystalline orthorhombic and hexagonal layered structure. The field effect transistors of SnS and SnS<SUB>2</SUB> thin films exhibited on–off drain current ratios of 8.8 and 2.1 × 10<SUP>3</SUP> and mobilities of 0.21 and 0.014 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP>, respectively. This difference in switching device characteristics mainly depends on the carrier concentration because it contributes to off-state conductance and mobility. The major carrier concentrations of the SnS and SnS<SUB>2</SUB> thin films were 6.0?×?10<SUP>16</SUP> and 8.7?×?10<SUP>13</SUP> cm<SUP>−3</SUP>, respectively, in this experiment.</P>

Solution-Processable, Ag-Sandwiched Nanotube-Coated, Durable (SAND) Architecture Realizing Anti-breaking Cyclic Heating on Arbitrary Substrates

Minwook Kim,Mingyu Kim,Kwangjun Kim,Yongju Lee,Minyong Park,Byeol Han,Hyunchan Noh,Sangwon Hwang,Sang Hoon Lee,Jong G. Ok 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.5

We develop a solution-processable, Ag-sandwiched carbon-nanotube-coated, durable (SAND) architecture that enables power-efficient and highly consistent cyclic heating up to 400 °C at 6 V with neither structural degradation nor substrate breakage. The Ag/CNT/Ag-stacked SAND structure, comprising an airbrushed carbon nanotube (CNT) network layer sandwiched by the Ag layers reduced with ionic Ag ink coatings, can be created by a facile and scalable all-solution-processable fabrication protocol without resorting to vacuum-assisted nanofabrication. Through a systematic comparison with Ag-only and CNT/Ag- or Ag/CNT-bilayered structures, we show that the SAND architecture can improve the joule-heating efficiency and uniformity, and more importantly, the anti-breaking durability to overcome the thermal expansion discrepancy against the underlying substrate. This is analytically interpreted through a thermal stress-induced substrate breaking mechanism, where the increasing difference in the thermal expansion between the substrate and coated layers upon heating can be effectively suppressed within the SAND architecture. Readily applicable to more scalable, diverse substrates ranging from brittle glass to large-area polymer films, the SAND architecture can be utilized in the flexible and reliable anti-failure heating devices required in such applications as machine and vehicle components, sensor systems, and safety and warm-up gears.

Standardization of Purge Valve Size in Consideration of Plumbing Condition

Lee Minwook,Lee Taekjun 한국가스학회 2019 한국가스학회 학술대회논문집 Vol.2019 No.10

Greatly improved electrochemical performance of lithium–oxygen batteries with a bimetallic platinum–copper alloy catalyst

Lee, Minwook,Hwang, Yubin,Yun, Kyung-Han,Chung, Yong-Chae Elsevier 2015 Journal of Power Sources Vol.288 No.-

<P><B>Abstract</B></P> <P>Research on the cathode catalysts of lithium–oxygen (Li–O<SUB>2</SUB>) batteries is one of the most important branches to commercialize these batteries to overcome the sluggish kinetics during both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). In this study, a high performance catalyst based on a bimetallic Pt–Cu alloy is investigated for Li–O<SUB>2</SUB> batteries using first-principles calculation. The theoretical prediction shows that the Pt–Cu alloy is much more effective than the pure Pt according to the electrochemical performance. In particular, the effectiveness of the catalytic property is maximized in the case of the PtCu (111) surface which greatly reduces the large overpotentials of the original Li–O<SUB>2</SUB> batteries during the OER/ORR. It is identified for the first time that the charge overpotentials are affected mainly by the inherent surface charge character of the alloy catalyst. It is observed that the more negatively charged PtCu (111) surface can act as a weakly positively charged surface for the adsorption of Li–O intermediates and thus result in weak ionic bonding of the intermediates on the surface. As a result, the dominant factor improving the catalytic performance is clearly demonstrated, providing insight into the design of an efficient catalyst for Li–O<SUB>2</SUB> battery technologies.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Li–O<SUB>2</SUB> reactions are investigated on Pt–Cu alloy catalysts using DFT calculation. </LI> <LI> PtCu (111) has greatly reduced overpotentials, <I>η</I> <SUB>C</SUB> = 0.49 V and <I>η</I> <SUB>DC</SUB> = 0.26 V. </LI> <LI> Inherent surface charge of alloy catalyst mainly affects <I>η</I> of Li–O<SUB>2</SUB> battery. </LI> <LI> Pt-based alloys have general rule for Li–O<SUB>2</SUB> reactions decided by surface charge. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

대학교수의 진로지도 역량 강화를 위한 정책 지원방안 요구분석

이민욱(Minwook Lee),장현진(Hyun-jin Jang),김대영(Dae-young Kim),이가영(Gayeong Lee) 한국진로교육학회 2020 진로교육연구 Vol.33 No.2

본 연구의 목적은 대학교수의 진로지도 역량을 강화하기 위한 정책 지원방안을 도출한 후, 도출한 지원방안의 필요수준과 현재수준을 조사하여 우선적으로 지원해야할 지원방안이 무엇인지 알아보는 것에 있다. 이를 위해 전문가 26인을 대상으로 조사를 실시하여 정책 지원방안 목록을 도출하고, 전국 4년제 대학교수 301인에게 도출된 지원방안의 현재수준과 필요 수준을 조사하여 요구분석을 실시하였다. 연구 결과는 다음과 같다. 첫째, 국가수준의 지원방안 요구분석 결과, ‘국가 수준의 진로지도, 취․창업 관련 정보 제공 시스템 구축’, ‘국가 수준의 학생 진로지도 방법, 취업역량 제고 방법 등 자료 개발 및 보급’, ‘산학연계 전공 교육 강화를 위한 외부 전문 인력 풀 구축 및 제공’, ‘학생 진로역량 강화를 위한 재정지원 사업운영’, ‘현장실습 및 산학연계 확대를 위한 정책적 지원 확대’, ‘대학 내 취업담당조직, 고용지원 센터, 창업지원센터 등 관계자 협의회 운영 지원을 통한 협력적 네트워크 구축’의 6개 방안이 최우선순위로 도출되었다. 둘째, 대학수준의 지원방안 요구분석 결과, ‘교수 진로지도 활성화를 위한 활동비, 교육훈련비 등 제공’과 ‘진로지도 실적을 연구, 강의 및 봉사 시수 대체 인정 또는 업무 시간 인정’의 2개 방안이 최우선순위로 도출되었다. 이러한 연구 결과를 토대로 대학교수의 진로지도 활성화 및 역량 제고를 위한 후속 연구를 제언하였다. The purpose of this study was to identify support plans to enhance career guidance competency of university faculty, and then examine the required and current levels of the derived support plans to find out which plan should be supported first. To achieve this goal, we conducted an open questionnaire survey for 26 experts to derive a list of support plans, and then surveyed the current level and required level of the support plans for 301 4-year university professors nationwide. The results of this study are as follows. First, as a result of conducting needs analysis for support plans at national level, ‘Establishment of information system for career guidance, job, and start-up at national level’, ‘Developing and disseminating materials at national level such as how to provide career guidance to students and how to improve their employment competency’, ‘Building and providing a pool of external experts to strengthen education in industry-academia cooperation major’, ‘Operation of financial support projects to enhance students" career competency’, ‘Expanding policy support for field training and industry-academia cooperation expansion’, ‘Establishing a collaborative network through support for the relevant councils such as the students’ employment department, employment support center, and start-up support center’ were derived as the top priority support plans. Second, as a result of conducting needs analysis for support plans at university level, ‘Providing activity and education & training expenses for facilitating career guidance of professors’ and ‘Recognition of career guidance performance as research, lecture and volunteer hours, or work hours’ were derived as the top priority support plans. Based on these results, we suggested follow-up studies to promote career guidance of university faculty and enhance their competency.

Are Outcomes Comparable for Repair of AO/OTA Type 13C1 and Type 13C2 Distal Humeral Fractures Using the Paratricipital Approach?

Soonchul Lee,Eugene Baek,Minwook Kim,Junhan Kim,Hyun Il Lee,Do Kyung Kim,Yoon Jang,Soo-Hong Han 대한정형외과학회 2022 Clinics in Orthopedic Surgery Vol.14 No.2

Background: Studies have reported favorable outcomes using the paratricipital approach for fixation of distal humeral intra-articular fractures. However, literature evaluating the clinical results of the approach remains limited. The objective of this study was to compare clinical outcomes between type 13C2 and type 13C1 distal humeral fractures after open reduction and internal fixation performed using the same approach and same type of plate. Methods: A total of 52 adults with type 13C1 or 13C2 distal humeral fractures were treated surgically at our institution during 2006 to 2018. We retrospectively analyzed data from 29 of these patients (19 with type 13C1 fractures and 10 with 13C2 fractures) who met the inclusion criteria. All subjects were followed for a minimum of 2 years postoperatively. Clinical and radiologic results were analyzed to determine differences in outcomes between the two types of fractures. Clinical results were evaluated using elbow range of motion (ROM), Mayo Elbow Performance Score (MEPS), and Quick Disabilities of the Arm, Shoulder and Hand (Q-DASH) score. Alignment, fracture union, and presence of posttraumatic arthritis were evaluated radiologically. Results: The patients’ mean age was 51 years, and the mean duration of follow-up was 29 months. Mean ROM was 129.5° ± 21.5° in the type 13C1 group and 123.0° ± 20.6° in the 13C2 group (p = 0.20). Mean Q-DASH score was 12.6 ± 11.7 in the 13C1 group and 16.2 ± 19.8 in the 13C2 group (p = 0.60). Mean MEPS was 92.9 ± 8.5 in the 13C1 group and 85.0 ± 14.1 in the 13C2 group (p = 0.09). Carrying angle did not differ significantly between the 13C1 and 13C2 groups. No patient in either group exhibited nonunion or posttraumatic arthritis. Conclusions: Although the paratricipital approach has the disadvantage of limited visualization of articular surfaces, there were no differences in surgical outcomes between type 13C1 and type 13C2 distal humeral fractures after fixation using this approach. Thus, surgeons may need to consider using the paratricipital approach for open reduction and internal fixation of 13C2 distal humeral fractures.

초음속 유동 내 입자의 크기에 따른 속도 발달 및 유동과의 상호작용에 관한 수치해석적 연구

이민욱(MinWook Lee),윤석구(SukGoo Yoon),김호영(HoYoung Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11

The method in which solid particles are accelerated through a supersonic gas flow via a de Laval convergent-divergent nozzle is known as cold-spray coating. In the current unsteady computation, particles of various sizes are stagnated inside the supersonic nitrogen gas to examine the effect of particle size on the shock interaction around the particle. A particle is hypothetically situated inside the supersonic flow in which distinctive discontinuity of shock characteristics is simulated and analyzed. Under given Nozzle Pressure Ratio of NPR=P<SUB>o</SUB>/P<SUB>e</SUB>=9.5, the exit Mach number is set to 2.2. The diameter of the titanium particle, circular in shape, is varied from 1, to 10, 50, and 100 ㎛. The results indicate that the smaller the particle, the easier it is to accelerate the particles because of their faster response or relaxation time. This trend is also consistent and verified with a steady computation. The flow downstream tends to pulsate due to fluctuations caused by the shockwave which leads to moderate turbulence in flow behind the shockwave.

낮은 높이로 설치되는 고속도로용 가로등 배광 연구

이민욱(Minwook Lee ),김훈(Hoon Kim) 한국조명·전기설비학회 2018 한국조명·전기설비학회 학술대회논문집 Vol.2018 No.5