All-carbon-based cathode for a true high-energy-density Li-O₂ battery

Lim, Hee-Dae,Yun, Young Soo,Cho, Se Youn,Park, Kyu-Young,Song, Min Yeong,Jin, Hyoung-Joon,Kang, Kisuk Elsevier 2017 Carbon Vol.114 No.-

<P>Li-O-2 batteries have a high theoretical energy density; however, their current cathode system based on a heavy metal framework strikingly diminishes their real energy density. Herein, we report the fabrication of all-carbon-based cathodes composed of conventional active carbon and a carbon mesh (CM) framework produced from waste silk fabric by simple pyrolysis. CM frameworks show a high electrical conductivity of similar to 150 S cm(-1), good tensile strength of 34.1 +/- 5.2 MPa, and a Young's modulus of 4.03 +/- 0.7 GPa, as well as a well-ventilated ordered macroporous structure. These all-carbon-based cathodes exhibit stable cycling and high energy densities of similar to 2600 Wh kg(-1) based on total electrode weight, which are 4-15 times higher than those of conventional air cathodes. (C) 2016 Elsevier Ltd. All rights reserved.</P>

황색포도상구균 신속 검출용 간이 진단키트

김기영,박샛별,문지혜,이상대,이새롬,장윤정 충남대학교 농업과학연구소 2013 농업과학연구 Vol.40 No.2

This study was performed to develop a rapid test kit for pathogenic Staphylococcus in various samples. The rapid detection kit has been fabricated based on nitrocellulose lateral-flow strip. Colloidal gold and Staphylococcus antibodies were used as a tag and a receptor, respectively. Manually spotted Staphylococcus antibody and anti-mouse antibody on the surface of nitrocellulose membrane were used as test and control lines, espectively. Feasibility of the rapid kit to detect Staphylococcus aureus in samples were evaluated. The intensity of the color of the tes line started to increase with the samples in which higher concentration of the cells were contained. The sensitivity of the sensor was 106 cfu/mL Staphylococcus spiked in PBS. Also, the rapid test kit could detect 105 cfu/mL of Staphylococcus in chicken meat extract.

학습난이도 조절이 다운증후군아동의 일탈행동에 미치는 효과

김윤영,이영연,이대식 한국정신지체아교육학회 2003 지적장애연구 Vol.5 No.-

본 연구의 목적은 일반학급주도 통합교육을 받고 있는 다우중후군 정신지체아동의 비학습행동 감소와 학습난이도 조절의 기능적 관계를 알아보는 데 있었다. 대상아동은 다른 사람의 물건을 자주 집어가고, 가방 속의 물건을 모두 꺼내어 주변을 어지럽히며, 아무데나 낙서하고 색칠하는 등의 비학습 행동을 보였다. 중재 방안으로, 일반교육과정의 교과와 학습주제는 동일하지만 내용과 학습방법은 대상아동의 학업 및 행동 수준에 맞도록 낮추어서 과제를 제시하는 학습난이도 조절 전략을 사용하였다. 연구대상은 단일대상으로 인천G초등학교 1학년 여자아동 1명이었다. 연구는 2단계에 걸쳐 수행되었다. Ⅰ단계는 ABC 기능평가와 기능분석 단계로, 행동 관찰과 기능분석을 통해 비학습행동이 학습 환경 요인과 기능적관계에 근거하여 학습난이도 조절 전략을 선정하였다. Ⅱ단계에서는 선정한 학습난이도 조절을 적용했을 때 비학습행동 감소에 미치는 영향을 분석하였다. 분석을 위한 자료수집은 사건 중심측정으로 시간간격별 부분표집법을 적용하여 정해진 시간 간격동안 비학습 행동이 발생하였는지 관찰하여 기록하였다. 연구설계로는 ABABAB 반전설계를 실시하였다. 실험결과, 학습난이도 조절 지도전략은 비학습행동 감소에 긍정적인 영향을 미쳤다. 본 연구는 통합교육을 하고 있는 일반교사가 특수아동의 문제행동을 해결하기 위해 기능평가와 단일대상 연구기법을 사용하여 적절한 지도 전략과 그 효과 검증이 가능함을 보여주고 있다. The purpose of this study was to determine the functional relationship between controlling learning difficulty and a decrease in nonlearning behaviors of the Down's syndrome mentally retarded child who was learning in integrative education. Nonlearning behaviors of the subject were as that take away others' things repeatedly, take out things of a bag and scatter around, scribble and paint on anything as paper. Controlling learning difficulty meant teaching strategies that subjects and themes of the general curriculum are identical, but contents and methods were presented properly to the subject. The subject of this study was single and first grader of G elementary school in Incheon. This study consists of two stages. The first was composed of an ABC functional assessment and functional analysis. Then nonlearning behaviors was related to the variable of learning environment and determined the teaching strategies. The second was selected controlling learning difficulty - teaching strategies, and then nonlearning behaviors decreased when controlling learning difficulty was given with the child. The direct observation and partial-interval recording were used for data collection. Nonlearning behaviors was observed from 8:40 a.m. to 9:20 a.m. for 40 minutes general education class. And for the record and measure of behaviors, the partial-interval recording of event-based recording was used. The study design was used of ABABAB reversal designs. As a result, the teaching strategies based on functional assessment and analysis had a positive influence on nonlearning behaviors, nothing but another behaviors characteristic and thought and attitudes of the subject. The study applied the functional assessment and the single subject research, the implication of the study showed that the method is effective for general teachers to determine teaching strategies in exceptional children's problem behaviors. Therefore, the general teachers should clarify relationships between the exceptional children's problem behaviors and the learning environment variables, make an effort to help ??

공분산구조분석법을 활용한 통행수단, 활동 및 통행행태에 대한 인과성 평가

장태연,김대영,김정호,권진영 전북대학교 공학연구원 ( 구 전북대학교 공업기술연구소 ) 2002 工學硏究 Vol.33 No.-

Activities done by individual are usually classified into obligatory and discretionary ones. Simple or complex trip pattern is performed as these activities are linked and various travel modes are used. Individuals try to link several trips as a type of chain to save transportation resources such as travel distance or time, which consequently produces complex trip pattern. These changes in urban transportation environment and less studies on activity-based characteristics make difficult to forecast trips resulting from trip linkage behavior. The purpose of study is to analyze possible causal relationships among activities, travel mode choices and travel patterns, assuming that they are directly influenced by individual or household attributes. Two kinds of models are established to achieve this purpose. One is the allocation model for mode choice for activities by three stage least square estimation method under the restricted conditions. The other is covariance structure model(LISREL) to analyze direct and indirect effect among attributes. As a result, the allocation of travel modes is mainly influenced by variables such as gender, education level, marriage, and children under 13 years old. In LISREL, it is shown that those variables well explain an exogenous personal attributes and only family income do an exogenous household attributes. While trip pattern attributes is well reflected by travel mode attributes, it is less reflected by activity attributes.

산딸나무 열매로부터 저밀도 지질 단백질(LDL) 산화 역제물질의 분리

이대영,송명종,김민정,정낙훈,정태숙,이윤형,백남인 경희대학교식량자원개발연구소 2007 硏究論文集 Vol.26 No.1

산딸나무 열매를 100% MeOH로 추출하고, 얻어진 추출물을 EtOAc, n-BuOH 및 물로 용매 분획 하였다. 이 중 EtOAc 분획으로부터 silica gel과 octadecyl silica gel(ODS) column chromatography를 반복하여 1종의 lignan 화합물을 분리, 정제하였다. 화합물의 화학구조는 NMR, Ms 및 IR 등의 스펙트럼 데이터를 해석하여, (+)-pinoresinol (1) 로 동정하였다. 이 화합물은 산딸나무에서 처음 분리되었다. LDL-항산화활성 억제활성이 20㎍/mL 처리농도에서 85.1±1.3%로 나타났다. (+)-Pinoresinol was isolated from the EtOAc fraction of methanol extracts of the fruits of Cornus kousa Burg. The chemical structures of (+)-pinoresinol was determined by spectroscopy method, as well as 1D- and 2D-NMR (^(1)H-^(1)H COSY, HSQC and HMBC) spectroscopy. This compound was the first to be isolated from C. kousa Burg. Also, (+)-pinoresinol inhibited LDL-oxidation with the inhibitory activity of 85.1±1.3% at a concentration of 20 ㎍/mL.

여가활동 유형이 여가만족에 미치는 영향

김의영,김의영,김영숙,윤대중,이병기 龍仁大學校 武道硏究所 2002 武道硏究所誌 Vol.13 No.1

This research is designed to make a comparative analysis of the types of leisure activities and the degree of leisure satisfaction by demographic background variable and to present basic materials necessary for the development of programs for local policies on leisure in accordance with the local autonomous system with a view to determining the relationship between leisure and life satisfaction by type of leisure activity. The following are the findings. First, the survey on testing the difference of leisure satisfaction by gender failed to test the difference in psychological and physiological satisfaction, but there were a statistically significant difference in educational, social and relaxation satisfaction at a level of 1 percent. And the survey failed to test the difference in psychological satisfaction by age, but there was a statistically significant difference in leisure satisfaction by society, education, job, monthly income, and health. Second, the survey on the influences of the types of leisure activities on leisure satisfaction revealed that there was a statistically significant influences in all the subordinate variables of leisure satisfaction.

카본블랙의 종류와 충전량이 NR Compound 의 동적 점탄성에 미치는 영향

김완영,이대수,김윤섭 全北大學校 1990 論文集 Vol.32 No.-

Bound rubber formation of NR(natural rubber) compound containing various carbon blacks was increased as I_2 absorption number or DBPA (dibutylphthalate absorption) value was increased. The increases of surface area of carbon black resulted in increases of heat build-up and tan δ at 60℃ but decreases of rebound property and wear loss of NR compound. It is speculated that more damping at the interface of carbon black and rubber occurs in the presence of carbon black of high surface area. Increasing the loading level of carbon black N220 in NR compound resulted in the acceleration of cure rate. Tensile strength, elongation at break, wear loss and rebound property were found to decrease but heat buildup and tan δ at 60℃ to increase with the content of carbon black. Therefore, it is concluded that increasing the loading level of carbon black may affects rolling resistance of tires adversely.

저가 후막 EL소자 제조 및 신뢰성 평가

강계원,김대연,이영훈,강봉석,박정현,최병호 금오공과대학교 산업기술개발연구원 2000 産業技術開發硏究 Vol.16 No.-

AC powder electroluminescence(EL) device consists of seven layers : PET substrate, transparent electrode, phosphor layer, dielectric layer, two layer metal electrodes and protective layer. Etch layer needs to control to improve electrical and optical properties. Both phosphor and dielectric layer among them is more important to increase its properties. For long-time reliability, proper choices of passivation and sealing material are essential. In this paper, influence of phosphor and dielectric layer thickness on EL performance is studied. Type of cellulos is selected as a sealing material to avoid moisture. To add two type of plasticizer to resin improves flexibility and passivation of EL devices. Through this experiments, technologies of fabrication low-cost thick film EL device can be established.

신장의 원시성 신경외배엽 종양

송상용,조은윤,이정원,고재향,김미경,김대식,고영혜 대한병리학회 1998 Journal of Pathology and Translational Medicine Vol.32 No.3

장상피화생과 Helicobactor pylori와의 상관 관계에 관한 연구

이복희,김대수,이현숙,진영주,윤세진,송형근,성노현,정현용,이동호 충남대학교 의과대학 지역사회의학연구소 1994 충남의대잡지 Vol.21 No.2

In 1965 Lauren divided advanced gastric carcinoma into two main types-namely, "intestinal" and "diffuse" type carcinoma, which differ not only morphologically but also in their clinical and epidemiological characteristics. Moreover, a different histogenetic process has been postulated by many authors that intestinal type gastric carcinoma might arise from areas with intestinal metaplasia. Since Warren and Marshall reported the presence of Helicobacter pylori in the stomach in 1983, strong evidence has been obtained that there is a close relationship between Helicobacter pylori and chronic gastritis, atrophic gastritis, intestinal metaplasia, and intestinal type gastric carcinoma. To study the relationship between intestinal metaplasia and Helicobacter pylori infection, we performed gastroscopic biopsies and CLO tests taken from patients with epigastric pain. Only 87 patients with macroscopically suspected antral gastritis were included. The prevalence of intestinal metaplasia in gastric antral biopsies increased from 33.3% in the age group<30 years to 63.6% in the age group 60 years. When all patients were divided into two age groups-namely, (i)<50 years(n=41) and (ii)≥ 50 years(n-=46), intestinal metaplasia was found significantly more often in patients ≥ 50 years. ((i) 39.2%, (ii) 54.3%, p<0.0001). The prevalence of Helicobacter pylori in gastric antral biopsies decreased from 66.7% in the age group<30 years to 62.5%, in the age group in the age group 50 to 59 years. When all patients were divided into the same two age groups-namely(i)<50 years and (ii)≥50 years, the prevalence of Helicobacter pylori did not differ between two groups in a statistically significant way. The mean age of intestinal metaplasia positive patients who were also Helicobacter pylori positive was 48±11.0(mean±S.D.)years, whereas the mean age of intestinal metaplasia positive patients who were Helicobacter pylori negative was 52±9.7(mean±S.D.)years. In conclusion. although our data do not prove a causal relationship between Helicobacter pylori infection and the histogenesis of intestinal metaplasia, we suggest that Helicobacter pylori plays an important role in the development of intestinal metaplasia in the gastric mucosa. Whether Helicobacter pylori has to be present at all times during this process or is only necessary as a 'trigger', needs further research.