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고상반응법을 이용한 Li<sub>2</sub>MnSiO<sub>4</sub> 합성
김지수,심중표,박경세,선호정,Kim, Ji-Su,Shim, Joong-Pyo,Park, Gyung-Se,Sun, Ho-Jung 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.5
Synthesis of $Li_2MnSiO_4$ was attempted by the conventional solid-state reaction method, and the phase formation behavior according to the change of the calcination condition was investigated. When the mixture of the three source materials, $Li_2O$, MnO and $SiO_2$ powders, were used for calcination in air, it was difficult to develop the $Li_2MnSiO_4$ phase because the oxidation number of $Mn^{2+}$ could not be maintained. Therefore, two-step calcination was applied: $Li_2SiO_3$ was made from $Li_2O$ and $SiO_2$ at the first step, and $Li_2MnSiO_4$ was synthesized from $Li_2SiO_3$ and MnO at the second step. It was easy to make $Li_2MnSiO_3$ from $Li_2O$ and $SiO_2$. $Li_2MnSiO_4$ single phase was developed by the calcination at $900^{\circ}C$ for 24 hr in Ar atmosphere as the oxidation of $Mn^{2+}$ was prevented. However, the $Li_2MnSiO_4$ was ${\gamma}-Li_2MnSiO_4$, one of the polymorph of $Li_2MnSiO_4$, which could not be used as the cathode materials in Li-ion batteries. By applying the additional low temperature annealing at $400^{\circ}C$, the single phase ${\beta}-Li_2MnSiO_4$ powder was synthesized successfully through the phase transition from ${\gamma}$ to ${\beta}$ phase.
한국 산업용 건물지붕 적용 PV에 의한 발전량 및 CO<sub>2</sub> 분석연구
김지수,이응직,황정하,Kim, Ji-Su,Lee, Eung-Jik,Hwang, Jung-Ha 한국태양에너지학회 2010 한국태양에너지학회 논문집 Vol.30 No.6
The purpose of this study is to provide foundational data for expansion of solar generation in building application, a clean energy, by introducing applicability of solar power generation system on roofs of industrial buildings and computing expected amounts of power and carbon dioxides reduction. As methodologies of this study, after reviewing 120,000 domestic factories to verify the BIPV feasibility for industrial building sthrough theoretical considerations of solar generation system, we calculated BIPV application methods and subsequent expected power generation quantity and carbon dioxide reductions through roof type analysis. we analyzed four cases of expected power generation amounts of solar batteries according to application methods, and when considering that the main type of roofs are slant roofs according to the investigation result about roof forms of domestic industrial complexes, we believe that the module angle of a slant roof around $17^{\circ}$(case3) is most suitable for the application. Finally, we came up with 517,944[TOE] as the corresponding petroleum tonnage based on this computed expected power generation amount and the amount of 1,214,836[$tCO_2$] carbon dioxide reductions by calculating them by energy sources.
천공분지에 기저를 둔 도서형 회전 근막 피부 피판을 이용한 압박궤양의 치료
김지수,김동훈,이동락,임준규,Kim, Ji-Su,Kim, Dong-Hoon,Lee, Dong-Lark,Lim, Jun-Kyu 대한미세수술학회 2007 Archives of reconstructive microsurgery Vol.16 No.1
The reconstruction of deep soft tissue defect such as pressure sore has difficult problems. Myocutaneous flaps have been used commonly as the best coverage method for pressure sore. But, they have several drawbacks such as sacrifice of functional muscle, high morbidity of the donor sites and bulkiness at the recipient site. The concepts of perforator flap has recently developed and widely used to overcome these disadvantages. Between March 2005 to July 2006, we have treated 9 patients who had pressure sore using perforator based fasciocutaneous island rotation flap. Preoperative unidirectional Doppler was used in all cases. Mean number of perforator vessels was 3.8 and flap sizes were from $7{\times}5\;cm$ to $14{\times}13\;cm$. Rotation angles of flap were from 90 degree to 180 degree. In all cases, donor sites were closed primarily. All flap survived completely and postoperative complications were wound dehiscence in 1 case, wound infection in 3 cases. The mean postoperative follow up period was 15.7 months and recurrence was not reported. We could decrease donor site morbidity and cover wound sites easily by using flap rotation and get robust blood supply without sacrifice of functional muscle. Fasciocutaneous perforator island rotation flap would be very useful for various pressure sore treatment.
김지수(Kim, Ji Su),박승희(Park, Seung Hee) 학습자중심교과교육학회 2021 학습자중심교과교육연구 Vol.21 No.15
목적 본 연구의 목적은 특수교사를 위한 플립러닝(flipped learning)의 개념과 플립러닝 수업의 특색을 제시하고, 발달장애(지적장애, 자폐성장애) 학생을 위한 플립러닝 적용 및 지원방안을 제시하는 것이다. 방법 플립러닝 관련 국내외 총 46편의 문헌(국내 29편, 국외 17편) 분석 및 일반교육 및 특수교육 전문가 5명과의 협의회를 실시하였고, 발달장애 학생을 위한 플립러닝 적용방안에 대하여 2명 전문가의 검토를 받았다. 결과 첫째, 일반 수업과 플립러닝 수업을 비교하며 플립러닝의 개념을 6가지로 판별하였고, 비장애학생과 장애학생을 위한 플립러닝 적용 수업의 특색을 구분하여 제시하였다. 둘째, 발달장애 학생만을 대상으로 한 ‘분리수업’에서 플립러닝의 적용 절차, 기능적 기술 교수를 위한 플립러닝 적용 수업계획의 예시를 제시하였다. 셋째, 일반학급에서 플립러닝 적용 ‘통합수업’에 발달장애 학생의 참여를 지원하기 위한 일반교사, 특수교사, 특수교육보조인력 및 학부모의 역할 목록을 판별하여 제시하였다. 결론 본 연구는 발달장애 학생 수업의 질 제고를 위해 특수교사를 위한 플립러닝의 개념과 특색, 분리수업에서의 플립러닝 적용방안 및 플립러닝 적용 통합수업에 발달장애 학생의 참여 지원방안을 처음으로 탐색해 제시한 예비연구 성격을 지닌다. 끝으로 특수교육 현장 및 후속연구를 위한 제언과 연구의 제한점을 지적하였다. Objectives The aims of this study were threefold: First, to provide the concept of flipped learning along with the characteristics of flipped classroom strategies to special education teachers. Second, to suggest methods for adapting flipped learning in special and separate classes for students with developmental disabilities (DD) and third, to provide support methods for students with DD participating in flipped learning in inclusive classrooms. Methods A total of 46 articles regarding flipped learning were analyzed and the consultation from five education experts in the field were sought. The application procedures and examplary lesson plans of flipped learning for students with DD was completed through a review process by two special education experts. Results First, the concept of flipped class for students with DD in comparison with general class was identified. Furthermore, distinct features of flipped learning for both those students with and without DD were presented. Second, a plan where a special education teacher applied flipped learning directly in a separate class designed to teach functional skills to students with DD, was introduced. Third, for students with DD participating in inclusive flipped classroom, the role inventory of general and special education teachers, paraprofessionals, and parents was identified and confirmed to enhance the participation of students with DD in inclusive classes where flipped learning was applied. Conclusions This preliminary study suggests the possibility and strategies for adopting flipped learning for students with DD to advance the quality of teaching practices in separate and inclusive classes. It presents a forum for discussion on further topics related to applying flipped learning to teaching practices for students with DD.