http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
리튬 유황 전지용 PVdF 겔 고분자 전해질의 가소제에 따른 전기화학적 특성 평가
류호석,김종선,김동주,김동연,김익표,안효준,김기원,안주현,이건환,Ryu, Ho-Suk,Kim, Jong-Seon,Kim, Dong-Ju,Kim, Dong-Yeon,Kim, Ic-Pyo,Ahn, Hyo-Jun,Kim, Ki-Won,Ahn, Jou-Hyeon,Lee, Gun-Hwan 한국전기화학회 2007 한국전기화학회지 Vol.10 No.3
리튬/유황 전지에 적합한 전해질을 조사하기 위하여, 여러 종류의 글라임(glyme)계 가소제를 넣은 폴리비닐리덴플로라이드(poly(vinylidene fluoride):PVdF) 겔 고분자 전해질을 제조하여 전기화학적 특성을 실험하였다. 가소제는 에틸렌옥사이드(ethylene oxide; EO) 구조를 가지는 glyme계 유기용매 중에서, EO의 체인 길이가 다른 트리글라임(triglyme), 테트라글라임(tetraglyme), 폴리글라임(polyglyme (Mn=250, 500))의 네 종류를 사용하였다. 가소제 내의 EO의 체인 길이가 길어질수록 PVdF 겔 고분자 전해질의 이온전도도는 감소하였다. PVdF 겔 고분자 전해질의 가소제로 triglyme을 사용한 경우의 이온전도도가 $5.38{\times}10^{-4}\;S/cm$로 가장 높았으며, polyglyme(Mn=500)를 사용한 경우에는 $2.80{\times}10^{-4}\;S/cm$으로 가장 낮았다. 그러나 계면저항은 tetraglyme을 사용한 경우에 가장 낮게 나타났으며, 이 전해질을 리튬/유황 전지에 적용하였을 때 1232 mAh/g-S(이론용량의 70%)의 높은 초기 방전 용량을 나타내었다. In order to find out proper PVdF gel polymer electrolyte for Li/S battery, we investigated PVdF gel polymer electrolytes with various glyme type plasticizer such as polyglyme, tetraglyme, triglyme. The organic solvents as triglyme, tetraglyme, polyglyme (Mn = 250, 500) has different chain length of ethylene oxide(EO) in solvent of glyme system. ionic conductivity decreased as increasing chain length of EO in plasticizers. Ionic conductivity of PVdF gel electrolyte with tetraglyme, triglyme, polyglyme (Mn = 250, 500) at room temperature was $5{\times}10^{-4},\;3{\times}10^{-4},\;6{\times}10^{-5},\;3{\times}10^{-5}\;S/cm$, respectively. Li/S cell with PVdF gel polymer electrolyte using tetraglyme plasticizer had low interfacial resistance and the highest initial discharge capacity of 1232 mAh/g of active sulfur, which was about 70% utilization of theoretical value.
TV 대기모드 효율기준 개발을 위한 대기전력 실태 분석
김익표(Ik-Pyo Kim),노경수(Kyoung-Soo Ro) 한국조명·전기설비학회 2012 조명·전기설비학회논문지 Vol.26 No.8
Recently, there have been suggestions that power factor should be considered to increase the efficiency of electric power supply when evaluating the performance of the electric appliances in standby mode and the related studies have been conducted to improve the efficiency standard of standby power. But, they lack the analysis of the standby power characteristics with the changes of power factor. This study is conducted to analyze the standby power characteristics of TV which is a typical home appliance and reaches a conclusion that the apparent power can be a more reasonable index which reflects the efficiency of electric power supply. It is also found that LED TVs show the best performance in standby mode. Moreover, an example to set standby power standards on TVs to be applied in the future is suggested, considering the energy efficiency policies for appliances.
중학교 수학 수업에서 정수의 사칙계산의 원리에 따른 모델 선택에 관한 연구
김익표 ( Ik Pyo Kim ),정은희 ( Eun Hee Jung ) 한국수학교육학회 2012 수학교육 Vol.51 No.4
The purpose of the study were to analyze teaching models of arithmetic operations of integers in Korean middle school mathematics textbooks of the first grade and Americans`, from which we compare and analyze standards for choice of models of middle school teachers and preservice mathematics teachers. We also analyze the effect of the choice of teaching models for students to understand and appreciate number systems as a coherent body of knowledge. On the basis of that, we would like to find the best model to help students understand and reason the process of formulate the arithmetic operations of natural numbers and integers into the operation of the real number system. Furthermore, we help these series of the study to be applied effectively in the middle school mathematics class in Korea.
한윤철(Han, Yun-Cheol),김익표(Kim, Ik-Pyo),강규영(Kang, Kyu-Young) 한국태양에너지학회 2017 한국태양에너지학회 논문집 Vol.37 No.3
Crystalline silicon photovoltaic module certification began in 2007. “Renewable Energy Equipment Certification Scheme” was implemented until July 28, 2015. Then, the scheme was changed to “KS Certification Scheme” since July 29, 2015. A total of 2,331 models have been certified by 2016. The proportion of multi crystalline modules in certified products is higher than that of mono crystalline modules, and Korean modules account for 78% of the total certification modules. Chinese solar cells account for the highest percentage of 40% of the total modules and 62.4% of modules certified in 2016 use Chinese solar cells. With the development of technology, module power is continuously increasing, and efficiency is also rising. The average efficiency of mono crystalline module is 0.74% higher than the average of multi crystalline module. As a result of comparing domestic module with Chinese module, the highest efficiency of mono crystalline module and multi crystalline module and the average efficiency of mono crystalline module are higher than those of Chinese module, but the average efficiency of multi crystalline module is similar to that of Chinese module.
황석근 ( Suk Geun Hwang ),임석훈 ( Seog Hoon Rim ),김익표 ( Ik Pyo Kim ),김애숙 ( Ae Souk Kim ) 경북대학교 중등교육연구소 2004 중등교육연구 Vol.52 No.1
In this paper, we are concerned with the methods of improving an ability of a problem solving via creative thinking techniques. To organize learning contents, we adopt Mind map. To understand concepts of terminologies, we present a worksheet and have students complete it. By means of the completed worksheet and Forced connection, we have students make problems about the learning contents. From our study, we have affirmative results for the improvement of ability of a problem solving and more research is necessary about this subject.(Kyungpook National Univ./ Daegu Industrial High School/Waryong High School)
의사소통의 활성화가 수학적 추론 능력의 발달에 미치는 영향에 관한 사례연구
김익표,권은영,최정현 大邱大學校 師範大學 附設 敎育硏究所 2010 學校敎育硏究 Vol.5 No.2
NCTM(2000, p.60)은 수학적 추론 능력의 신장을 위한 의사소통의 활성화를 강조하고 있다. 그리고 추론을 포함한 수학적인 활동의 활성화를 위한 학생들 사이의 의사소통을 강조한 사례연구(Elbers, 2003; Goos, 2004)도 소개되었다. 이와 같이 많은 문헌들이 수학적 추론과 의사소통과의 관련성을 언급 하고 있지만 서로 어느 정도의 영향을 미치고 있는지에 대한 연구가 부족한 실정이다. 추론과 의사소통 을 포함한 수학적인 활동들이 별개의 것이 아닌 통합된 전체의 각 부분을 차지하면서 밀접하게 관련되어 있음을 인지하는 것은 학교 수학에서 중요한 부분이다. 따라서 수학교육의 목표를 향하여 가는 학생 들에게 관계망으로 연결된 수학적인 활동들은 효과적으로 목표에 도달할 수 있도록 도와주는 뼈대의 역할을 할 것이다. 본 연구의 목적은 학교 수학에서 의사소통의 활성화가 수학적 추론능력의 신장에 미치는 영향의 분석이다. 이를 위하여 학생들에게 단계적인 과제의 제시를 통하여 의사소통의 활성화를 유도하고 이것이 수학적 추론 능력의 신장에 미치는 영향을 탐색하고자 한다. The importance of mathematical communication and mathematical reasoning is currently standing out in mathematics education. As a matter of fact, lots of theses and documents are dealing with this subject, and are mentioning that these two factors develop together. However, there are few qualitative case studies in this fields. So, this study aimed at qualitative case study about the effects of active communication on mathematical reasoning devolopment throughout the experiments. This study recorded the process of improving mathematical reasoning through mathematical communication. For this, various problems which are from basic to advanced were presented by degrees. We hope this study has a lot of discussions about various methods in order that mathematical communication occurs actively in schools and that students become to recognize the importance of mathematical reasoning.
바둑판을 이용한 흑백 게임의 최적해를 구하는 선형대수학 알고리즘
이상구,박종빈,양정모,김익표 한국수학교육학회 2004 수학교육 Vol.43 No.1
For finding the optimal strategy in Blackout game which was introduced in the homepage of popular movie "Beautiful mind", we develop a mathematical proof and an algorithm with a software. We only use the concept of basis and knowledge of basic linear algebra. This process can be extended to the fullsize Go table problem and shows why we have to study mathematics at the college level.