http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Lee, Seungjin,Kim, Youngwoong,Wu, Ziang,Lee, Changyeon,Oh, Seung Jin,Luan, Nguyen Thanh,Lee, Junbok,Jeong, Dahyun,Zhang, Kai,Huang, Fei,Kim, Taek-Soo,Woo, Han Young,Kim, Bumjoon J. American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.48
<P>Aqueous-processed all-polymer solar cells (aq-APSCs) are reported for the first time by developing a series of water/ethanol-soluble naphthalenediimide (NDI)-based polymer acceptors [P(NDIDEG-T), P(NDITEG-T), and P(NDITEG-T2)]. Polymer acceptors are designed by using the backbones of NDI-bithiophene and NDI-thiophene in combination with nonionic hydrophilic oligoethylene glycol (OEG) side chains that facilitate processability in water/ethanol mixtures. All three polymers exhibit sufficient solubility (20-50 mg mL<SUP>-1</SUP>) in the aqueous medium. The P(NDIDEG-T) polymer with shorter OEG side chains is the most crystalline with the highest electron mobility, enabling the fabrication of efficient aq-APSCs with the maximum power conversion efficiency (PCE) of 2.15%. Furthermore, these aq-APSCs are fabricated under ambient atmosphere by taking advantage of the eco-friendly aqueous process and, importantly, the devices exhibit outstanding air-stability without any encapsulation, as evident by maintaining more than 90% of the initial PCE in the air after 4 days. According to a double cantilever beam test, the interfacial adhesion properties between the active layer and electron/hole transporting layers were remarkably improved by incorporating the hydrophilic OEG-attached photoactive layer, which hinders the delamination of the constituent layers and prevents the increase of series resistance, ultimately leading to enhanced durability under ambient conditions. The combination of increased device stability and minimal environmental impact of these aq-APSCs demonstrates them to be worthy candidates for continued development of scalable polymer solar cells.</P> [FIG OMISSION]</BR>
Formation of ZnO nanostructures grown on Si and SiO2 substrates.
Lee, Seungjin,Park, Eunkyung,Lee, Jongtack,Park, Taehee,Lee, Sang-Hwa,Kim, Jae-Yong,Yi, Whikun American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.9
<P>ZnO nanorods are grown on Si-based substrate by chemical bath deposition method in aqueous solution using zinc nitrate hexahydrate. Various substrates having different surface morphology are used to evaluate their effect on growing ZnO nanorods, such as flat Si(100) wafer, small and large textured-Si wafer, porous silicon, flat SiO2 wafer, small and large textured-SiO2 wafer. The length, diameter, geometry, and coverage density of ZnO nanorods are investigated by field-emission scanning electron microscopy and summarized. SiO2 is a preferred substrate for the growth of ZnO nanorods to Si if the surface morphology of substrate is same, and the textured surface has much higher coverage density (> 95%) than the flat surface. Each nanorod is vertically grown along the c-axis on the top of each pyramid face for textured substrate, and forms the 3D sea sponge-like ZnO structure. The characteristics of ZnO nanorods grown on various substrates are analyzed by grazing-angle X-ray diffraction (XRD) and photoluminescence (PL) measurements.</P>
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>
Comparative Analysis of TAEKWONDO Poomsae Professional Gym and High School Team Performance Factors
Seungjin Lee,Jaehwan Jeoung J-INSTITUTE 2021 International Journal of Martial Arts Vol.6 No.1
Purpose: The purpose of this study is to analyze the performance factors of Poomsae High School Team, which is destroying Poomsae specialized gym's stronghold by comparing the training place, training time, training method, various support, and leader's career and to find out the reason how they broke the stronghold of specialized gyms who have dominated the competition for a long time and performing well to provide guidance for Poomsae leaders. Method: In order to achieve the purpose of this study, 5 Taekwondo Poomsae specialized gyms and 2 pro-fessional school teams were conducted, and data were collected through literature surveys and in-depth inter-views on-site visits. Based on this, a comparative analysis of the performance factors of the Taekwondo Poomsae specialized gym and the high school team resulted in the following conclusions. Results: Overall, differences in scholarships, food expenses, support and training time and leaders' training concentration were shown. However, both groups focused on personality and sincere training when it came to guidance philosophy, and for the gyms, supply and demand of athletes and counseling with parents, and for high school temas, maintaining relationships with school teachers, and managing athletes in the camp were found to be difficulties. Conclusion: The reason why Poomsae specialized gym's performance factor is significantly lower than that of the professional high school team is that the number of camp and field training depends on the parents' economic factors, and because the performance is proportional to the training volume, the school team's training is relatively higher than the professional gym, which is analyzed as a factor that can produce good results.
Seungjin Lee,Daehun Shin,Yoon-Suk Hyun 대한견주관절학회 2022 대한견주관절의학회지 Vol.25 No.1
Proximal humerus fractures are the third most common fractures, totaling 4% to 5% of all fractures. Here, we present the case of a 39-yearold man with a dislocated four-part fracture of the proximal humerus with a huge bony Bankart lesion. Preoperatively, the bony Bankart lesion of the glenoid was not visualized on computed tomography scans or magnetic resonance imaging because the fracture of the proximal humerus was comminuted, displaced, and complex. It was planned for only the humerus fracture to be treated by open reduction and internal fixation using a locking plate. However, a fractured fragment remained under the scapula after reduction of the dislocated humeral head. This was mistaken for a dislocated bone fragment of the greater tuberosity and repositioning was attempted. After failure, visual confirmation showed that the bone fragment was a piece of the glenoid. After reduction and fixation of this glenoid part with suture anchors, we acquired a well-reduced fluoroscopic image. Given this case of complex proximal humerus fracture, a glenoid fracture such as a bony Bankart lesion should be considered preoperatively and intraoperatively in such cases.
Level of university students’ IT capability measurement
SeungJin LEE,JaMee KIM,WonGyu LEE 중소기업융합학회 2015 중소기업융합학회 국제학술대회논문집 Vol.2 No.1
As the IT industry, which was the core industry of the country in the 1990’s, has reached the limit of development, this study attempted to measure the IT competency of college students, who are our future leaders, and propose a countermeasure. The results show that college students’ scores were about 20 points lower than those of office workers, and males were more competent than women. As TOPCIT is the IT competency test first developed by Korea, it will be utilized in various ways.