http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Son, Jinyoung,Kim, Min-Sik,Lee, Hyun Woo,Yu, Jong-Sung,Kwon, Kwang-Ho American Scientific Publishers 2014 Journal of Nanoscience and Nanotechnology Vol.14 No.12
<P>We describe herein an improvement in the surface wettability of plasma-treated separators for use in lithium-ion batteries. We treated the separators with an O2/Ar inductively coupled plasma to increase their surface energy. The plasma treatment on the separator and plasma diagnostic experiments were performed in an inductively coupled plasma (ICP) reactor. The fraction of Ar in the O2/Ar plasma was changed from 0% to 100%. The plasma diagnostics were performed using optical emission spectroscopy and a double Langmuir probe. To confirm the morphological change of the separator membrane by the plasma treatment, we used the scanning electron microscopy. The surface energy measurements were performed using the drop method. We found that the plasma treatment transformed the separator from a hydrophobic membrane to a hydrophilic one, thereby achieving high separator wettability. After the treatment of the separators with O2/Ar plasma, the batteries exhibited better cycle performance and rate capacity than those employing the untreated ones.</P>
대학에서 실시간 영상 기반 및 음성 기반 소프트웨어의 교육적 효과 비교 분석
손진영(Jinyoung Son),정혜원(Hyewon Jeong),이지은(Jieun Lee),주은경(Eungyung Ju),임걸(Keol Lim) 학습자중심교과교육학회 2022 학습자중심교과교육연구 Vol.22 No.2
목적 본 연구에서는 영상 기반 소프트웨어와 음성 기반 소프트웨어의 교육적 효과를 비교하기 위해 실시간 쌍방향 토의 수업을 진행하여 토의 환경에서의 의사소통 유형 요소를 살펴보고, 소프트웨어 유형별 교육적 효과를 비교하여 대학에서의 실시간 쌍방향 토의수업 설계의 시사점을 도출하여 상호작용을 촉진할 수 있는 방안을 제시하고자 하였다. 방법 이를 위해 2021년 1학기 A대학에서 개설한 강좌를 수강하는 학생 38명을 대상으로, 총 7개의 소그룹에 5명 내외의 학생을 임의로 배정하여 네 번에 걸쳐 토의 활동을 진행하였다. 그리고 소그룹별 대화 내용을 분석 범주에 따라 ‘학습내용’, ‘학습지원’, ‘형용적표현’, ‘잡담’으로 구분하여 내용분석을 실시하였다. 결과 연구 결과, 전반적으로 음성 기반 소프트웨어보다 영상 기반 소프트웨어에서 다소 활발하게 토의 활동이 이루어진 것으로 나타났다. 그리고 소프트웨어와 내용분석 범주 간 관련이 있는 것으로 나타났는데 영상 기반 소프트웨어에서는 ‘잡담’이 활발하게 이루어졌고, 음성 기반 소프트웨어에서는 ‘학습지원’이 많이 이루어진 것으로 나타났다. 또한 심층 인터뷰 결과 영상 기반 및 음성 기반 소프트웨어의 교육적 가치를 확인하였다. 결론 이러한 결과를 토대로 대학에서의 실시간 쌍방향 토의 수업 진행 시 교육적 효과를 높이기 위한 수업 설계 방안이 제시되었다. Objectives In this study, we examined the patterns of communication types in synchronous interactive discussion classes. With those examination we analyzed educational effects between two media, video-based and audio-based software, trying to derive implications for synchronous interactive discussion classes design in universities. Methods In order to conduct research objectives, 38 students who took courses at A university in the Spring semester of 2021 were randomly assigned as five students to seven small groups and participated in the learning activities. we divided conversation contents of each small group into ‘learning contents’, ‘learning support’, ‘adjective expression,’ and ‘chatting’. Results Overall, it was proved that discussion was more active in video-based software than audio-based software. ‘Chatting’ was more active in video-based software, and ‘learning support’ was more accomplished in audio-based software. Also we have confirmed the educational value of video-based and audio-based software by in-depth interviews. Conclusions Based on these results, the instructional design plan to enhance educational effectiveness of synchronous interactive discussion classes at universities was proposed.
Design of Regional Coverage Low Earth Orbit (LEO) Constellation with Optimal Inclination
Shin, Jinyoung,Park, Sang-Young,Son, Jihae,Song, Sung-Chan The Korean Space Science Society 2021 Journal of Astronomy and Space Sciences Vol.38 No.4
In this study, we describe an analytical process for designing a low Earth orbit constellation for discontinuous regional coverage, to be used for a surveillance and reconnaissance space mission. The objective of this study was to configure a satellite constellation that targeted multiple areas near the Korean Peninsula. The constellation design forms part of a discontinuous regional coverage problem with a minimum revisit time. We first introduced an optimal inclination search algorithm to calculate the orbital inclination that maximizes the geometrical coverage of single or multiple ground targets. The common ground track (CGT) constellation pattern with a repeating period of one nodal day was then used to construct the rest of the orbital elements of the constellation. Combining these results, we present an analytical design process that users can directly apply to their own situation. For Seoul, for example, 39.0° was determined as the optimal orbital inclination, and the maximum and average revisit times were 58.1 min and 27.9 min for a 20-satellite constellation, and 42.5 min and 19.7 min for a 30-satellite CGT constellation, respectively. This study also compares the revisit times of the proposed method with those of a traditional Walker-Delta constellation under three inclination conditions: optimal inclination, restricted inclination by launch trajectories from the Korean Peninsula, and inclination for the sun-synchronous orbit. A comparison showed that the CGT constellation had the shortest revisit times with a non-optimal inclination condition. The results of this analysis can serve as a reference for determining the appropriate constellation pattern for a given inclination condition.
한진영(Jinyoung Han),조철현(Chulhyun Cho),손인수(Insoo Son) 한국인터넷전자상거래학회 2015 인터넷전자상거래연구 Vol.15 No.6
Big data has been recently recognized as a strategic tool to enhance firms’ competitiveness and one of the growth engines that create new knowledge industries. Accordingly, domestic and global market of big data is expected to grow in a rapid pace. Firms are also trying to figure out how to effectively use big data for their market competence. Despite the positive market expectations and firms’ growing interest, there has been a paucity of empirical studies on the use of big data in corporate environment. To bridge such gap, this study conducts a case study regarding an integrated customer log system at a Korean home shopping firm. For the case, the study explores the business backgrounds of introducing the system, its technical features, implementation procedure, benefits and practical implications. Our study contributes to IS research by expanding existing literature to empirical analysis for the corporate use of big data and can be used as a reference to understand the direction of implementing and utilizing big data system for strategic purposes.
진공 상온 분사 공정으로 제조된 Al_{2}O_{3} 필름의 광 투과도에 미치는 미세조직 특성의 영향
김진영 ( Jinyoung Kim ),박형권 ( Hyungkwon Park ),남진수 ( Jin Su Nam ),손경수 ( Kyung Soo Son ),임영태 ( Young Tae Im ),이재욱 ( Jae Wook Lee ),정봉근 ( Bong Geun Chung ),이창희 ( Changhee Lee ) 대한금속재료학회(구 대한금속학회) 2016 대한금속·재료학회지 Vol.54 No.1
Glass materials have been applied in various industrial fields. Research on improvement of mechanical properties has consistently been performed due to this material’s intrinsically vulnerable characteristics. Surface modification is considered as the promising method to supplement the weakness; especially, ceramics are thought of as appropriate materials for film materials because of their outstanding mechanical properties and their chemical stability. However, unfortunately, the optical transmittance of ceramic materials is poor, and can rather restrict this material’s utilization in glass. In this regard, the optical transmittance mechanism of vacuum kinetic sprayed Al_{2}O_{3} film was investigated. To control and analyze the film’s optical property, the gas flow rate, as a main process variable, was controlled; then, post heat-treatment was performed. Consequently, the film’s optical property was determined by three microstructural factors. That is, crystallite size, defects (including lattice distortion), and amorphous phase, generated during particle deposition, were found to strongly affect the transmittance.
Design of Regional Coverage Low Earth Orbit (LEO) Constellation with Optimal Inclination
Shin, Jinyoung,Park, Sang-Young,Son, Jihae,Song, Sung-Chan The Korean Space Science Society 2021 Journal of astronomy and space sciences Vol.38 No.4
In this study, we describe an analytical process for designing a low Earth orbit constellation for discontinuous regional coverage, to be used for a surveillance and reconnaissance space mission. The objective of this study was to configure a satellite constellation that targeted multiple areas near the Korean Peninsula. The constellation design forms part of a discontinuous regional coverage problem with a minimum revisit time. We first introduced an optimal inclination search algorithm to calculate the orbital inclination that maximizes the geometrical coverage of single or multiple ground targets. The common ground track (CGT) constellation pattern with a repeating period of one nodal day was then used to construct the rest of the orbital elements of the constellation. Combining these results, we present an analytical design process that users can directly apply to their own situation. For Seoul, for example, 39.0° was determined as the optimal orbital inclination, and the maximum and average revisit times were 58.1 min and 27.9 min for a 20-satellite constellation, and 42.5 min and 19.7 min for a 30-satellite CGT constellation, respectively. This study also compares the revisit times of the proposed method with those of a traditional Walker-Delta constellation under three inclination conditions: optimal inclination, restricted inclination by launch trajectories from the Korean Peninsula, and inclination for the sun-synchronous orbit. A comparison showed that the CGT constellation had the shortest revisit times with a non-optimal inclination condition. The results of this analysis can serve as a reference for determining the appropriate constellation pattern for a given inclination condition.