3D flexible Si based-composite (Si@Si₃N₄)/CNF electrode with enhanced cyclability and high rate capability for lithium-ion batteries

Kim, Si-Jin,Kim, Min-Cheol,Han, Sang-Beom,Lee, Gyu-Ho,Choe, Hui-Seon,Kwak, Da-Hee,Choi, Sun-Yong,Son, Byung-Goo,Shin, Myoung-Sun,Park, Kyung-Won Elsevier 2016 Nano energy Vol.27 No.-

<P><B>Abstract</B></P> <P>Despite extremely high capacity of Si-based anodes in lithium-ion batteries (LIB), Si-based materials have shown a structural collapse caused by a volumetric expansion/contraction during the cycling process. The conventional electrode structure, which consists of active materials, a current collector, a conducting agent, and a binder, actually showed a low loading of active material due to the other heavy components. In this study, we prepared a 3D flexible Si-composite electrode consisting of core (Si)-shell (Si<SUB>3</SUB>N<SUB>4</SUB>) NPs (Si@Si<SUB>3</SUB>N<SUB>4</SUB>) and carbon nanofibers (denoted as Si-composite/CNF). The Si-composite/CNF was directly utilized as an anode in the absence of the other components was electrochemically evaluated using a coin-type cell. The Si-composite/CNF showed a high capacity of 665mAhg<SUP>−1</SUP> at a fairly high current density of 10Ag<SUP>−1</SUP> and an extremely low capacity loss for 2000 cycles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We prepared Si-composite/CNF exhibits a 3D flexible Si-composite electrode. </LI> <LI> The electrode consists of core (Si)-shell (Si<SUB>3</SUB>N<SUB>4</SUB>) NPs (Si@Si<SUB>3</SUB>N<SUB>4</SUB>) and carbon nanofibers. </LI> <LI> The Si-composite/CNF was directly utilized as an anode. </LI> <LI> Si-composite /CNF exhibited high specific capacity and improved high rate cycling performance. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

燃料林造成에 關한 硏究 : 第2報 : 農山村農家一戶當 燃料林(아까시아나무)所要面積에 關한 調査硏究

金是璟,金在慶 진주산업대학교 1976 論文集 Vol.14 No.-

效果的인 燃料林造成을 爲한 適定燃料林 所要面積을 調査코자 1975年 2月∼1976年 5月까지 木校演習林(慶南 山淸郡 今西面)中 点生하고 있는 旣成燃料林分(아까시아)을 對象으로 하여 調査한바 그 結果를 要約하면 다음과 같다. 1). 8年生 根株에서 最大 및 最小萌芽本數는 各各 19本 및 5本이 發生되었으며, ha當 總本數는 28,280本으로 材積은 3.723㎥(2.98ton)로 調査되었다. 2). 5年生 根株에서 生立된 單幹狀의 本數는 ha當 2,890本으로 總材積은 15.895㎥(12.72ton)로서 年間 平均材積成長量은 3.974㎥(3.18ton)로 調査되었다. 3). 本調査에서는 燃料林(아까시아나무의 ha當 平均材積成長量이 3.974㎥(3.18ton)에 불과하나 合理的인 燃料林經營을 한다면 2∼3倍의 增收가 確實하며 또한 林産副産物 및 農業副産物을 燃料로 使用할 수 있으므로 農家一戶當 1ha의 燃料林을 造成하여 4年을 伐期로 連進帶狀皆伐法에 의해 萌芽更新을 實施한다면 農山村의 所要燃料量을 充當할 수 있을것으로 思料된다. This study was carried out to make the basic investigation fot the establishment of the fuel wood land from Feb. 1973 to May 1974. It was attempted to investigate the year fuel consumption for a standard farm house at the mountain village, farm land village, and the suburban farm village, and also to investigate the requirement of appropriate area of the fuel wood land, and it was investigated at the stand of Robinia pseudoacacia L. scattered in college forest located San Cheong, Kyung Nam. The results were summarized as follows. 1). The number of the maximum and minimum 8 year's sprouts which were grown at the root stock of Robinia pseudoacacia L. was 19 trees and 5 trees each. The number of the total tree per one hectare were 28,28O trees, and the volume of those were 3.723㎥(2.98tons). 2). The number of one stem form tree grown 5year's root stock of Robinia pseudoacacia L. was 2,980 trees, per one hectare. The total volume of the those was 15,895㎥(12.72tons), and the average year growth of volume was 3,974㎥(3.2tons). 3). The average year growth of Robinia pseudoacacia L. will be increased more than twice or three times comparing to the above through the more effective management of the fuel wood 1and, and when the four year term for final cutting are fol1owed the sprout reproduction by the progressive clear cutting in strip, and the by-products of agriculture and forest are used for the fuel, One hectare of the fuel wood land will be enough to the average year fuel consumption needed for the mountain and farm land village.

왕대의 立竹密度가 新竹發生에 미치는 影響

金是璟 진주산업대학교 1970 論文集 Vol.6 No.-

本試驗은 넓은 面積에 걸쳐 長期間 試驗한 結果가 아니고, 1969 2,5일에 各 處理區別로 伐竹을 開始하므로서 本試驗에 着手된 것이며, 그 成績調査는 1969. 8. 20일에 實施한 것이므로 1年도 못되는 試驗 datca 여서 正確한 結果라고 간주하기 어려위 계속 硏究키로 하고 위선 一次的으로 그 試驗한 結果를 要約하면 다음과 같다. 立竹本數를 달리한 各處理區間에 있어서 新竹發生本數, 新竹發生束數 및 新竹發生平均徑等에 有意性이 認定되지 않았음은 本實驗에 着手하기 前의 親竹으로 부터 편근이 임이 伸長되어 퍼져 나갔으므로 殘存母竹의 密度가 發筍狀況에 별영향을 미치지 못한 까닭에 平年에 發筍하는 狀況과 大同小異하다고 思料된다. This examination in not the result which is put to the test in large area for a long time, but I??ut the bamboo in each treating district on the 5th of Feb. 1969 and set about it. As the investigation of records is the data was enforced on the 20th of Oct, 1969 this year. I cannot think that the result exactly enforced, so I intend to continually it In a Primary examination the result is as follows in short. In each treating district taking different stand density the development amount of new bamboo shoot, devlopment bundle of new bamboo shoot and everage diameter of new bamboo shoot was not recognized significance. Because that is before seting about this examination the bamboos root had already expanded from mothers bamboo and had stretched, and stand density of surviving mother's bamboo had not influenced upon the germindtion of bamfoo shoot; I think that is substantial identity with minor difference to germination of bamboo shoot in a normal year.

정책갈등의 요인과 관리방안

이시경 啓明大學校 社會科學硏究所 2003 한국사회과학연구 Vol.22 No.1

고시조 종장 第一音步 고찰 : 第一音步 三音節 이외의 평시조를 중심으로

金始慶 동국대학교 국어교육과 1991 목멱어문 Vol.4 No.-

배기 저항의 능동제어를 통한 배기 시스템의 최적화에 관한 연구

임경빈,류봉조,이규섭,김상덕,송시영,이상훈 한밭대학교 생산기반기술연구소 2002 생산기반기술연구소 논문집 Vol.2 No.1

Automobile exhaust system has difficulty in concentrating contrary technology, which has diminishing effect of maximum exhaust noises and mininum exhaust pressure for output efficiency improvement into on system. This thesis has the purpose in management of basis study for silence and output efficiency improvement which can be satisfy low noises and low exhaust pressure at the same time through maximizing engine efficiency dealing with activity as the condition of engine controlling exhaust impedance actively. In this thesis, we obtained positive result by making experiment high efficiency exhaust induced shaped silencer in order to satisfy contrary matters which device the improvement of engine efficiency and low perception of exhaust noises at the same time. That is, we proved that it has more excellent in low perceiving noises of exhaust system and output improving efficiency than existing muffler by active controlling the exhaust impedance.

엘리뜨 및 一般住民의 意識과 行態

安淸市,金璟東 서울대학교 사회과학연구소 1984 社會科學과政策硏究 Vol.6 No.4

韓國 都市家族의 家事役割과 勢力關係에 關한 實證的인 硏究

柳時中,朴慶九 慶北大學校 東洋文化硏究所 1982 東洋文化硏究 Vol.9 No.-

This research has attempted to study urban housewive's role expectation and role performance in the family, power relations with their husbands and their marital satisfaction. The data for this research have been collected by sampling method. The number of samples is 556 housewives residing in Taegu city. They were interviewed according to the interview schedule. The result of this research can be summarized as follows: 1. Role Expectation and Role Differentiation (1) Viewed in the trational role differentiation by sex, the realm of women's role performance has been expanded while that of men's has been contracted. Husbands still play the trational men's role of earning income, handling official business and repairing house, whereas housewives perform their tradional role of cleaning house, laundry, doing kitchen work and child-care. (2) Housewives, however, have taken over the role of their husbands such as participation in school events and management of family finance. They also have shared their husband's role of household head by visiting relatives and partaking ceremonial occasions. Furthermore, they perform equal role in punishing children considered as the action symbilizing the husband's authority. (3) These role differentiation in the family is not the result of husband's defaulted role performance but the reflection of general tendency regarding housewive's fulfillment of both family tasks and social affairs as being desirable. 2. Power Relations (1)The conception of family power has been controversial issue among sociologists. Here I will restrict it to the decision-making. Husbands take a greater part in the choice of TV channels and housewives choice of menu and arrangement of household surroundings. They, however, make decision equally in the following detail areas; vacation plan, movement of house, choice of a hospital, amount of savings, child education, selection of contraceptive, marriage of children and supporting of parent-in-laws. (2) In addition, couple tend to make mutual decision in the significant areas of family life. In short, couples who make equalitaria decision-making outnumbers women or men who make unilateral decision-making outnumbers women or men who make unilateral decision-making. (3) Even in the stem family cohabitating with parents which accounts for one third of the whole respondents, the power of decision-making is given the son's couple and the power relations between couple are mainly equalitarian type. (4) Women indicate as the basis of power traditional norms and cultural norms rather than individual accomplishment such as income, education, and personality. 3. Marital Satisfaction (1) The result of using differently expressed questionaire impling the same subject has demonstrated that a great number of women are satisfied with their marriage while a few of them are not. (2) The issue of measuring marital satisfaction have been open to controversy in spite of a lot of researches concerning this subject. Age and education of the housewife, social status of the family and type of generational composition of the family have much influence on the housewife's marital satisfaction. 4. Conclusion As I have discussed above, women's role differentiation and power relations in the urban family has changed greatly compared to those in the preindustrial society of Korea. It has been revealed that the role differentiation and power relations has directed toward equalitarianism. This research dealing with only housewives can be completed by the equivalent study of men.

白木蓮 接木의 活着에 關한 硏究

金是璟 진주산업대학교 1968 論文集 Vol.2 No.-

白木蓮의 效果的인 繁殖法을 模索하기 위한 하나의 試圖로서 몇가지 接木方法을 李節과 日字別로 接木하여 그 活着成績을 調査하였는데, 그 試驗結果를 要約하면 다음과 같다. 白木蓮의 接木은 腹芽接으로서 秋李 9.10∼9.15日間에 實施하는 것이 가장 活着率이 높다는 것을 認定하였다. Magnolia denudata is a flowering tree in which all people can take pleasure as an ornamental tree of which flowers give out fragrant and are neat, beautiful and elegnant. In the past time every man couldn`t easily breed it because its breeding is very difficult. So, as the attempt to grop the effective method of breeding I grafted it using several method of grafting in accordance with the season and date and investigated the result of its sirvival. The result of this study are as follows; It was recognized that the grafting of magnolia denudata to be enforced from september 10, to september 15, in autumn as “side bud grafting”and raises the rate of its sirvival.

화백나무의 통나무直徑과 邊材率과의 關係에 關한 硏究

金是璟,黃震聲 진주산업대학교 1969 論文集 Vol.3 No.-

本校樹木園産의 화백나무에 關한 통나무直徑과 心材部直徑 및 邊材率과의 關係를 調査硏究한 結果를 要約하면 다음과같다. 1. 화백나무의 통나무直徑에서 心材部直徑을 求하는 實驗式 d=0.75698 D-0.12244를 決定하고 이 兩直徑間의 相關係數 r=+0.9901±0.0027이 計算되었으므로 高度의 有意性이 認定되었다. 2. 화백나무의 통나무直徑과 心材部直徑과의 關係는 大略直線的인 事實이라는 것을 알 수 있었다. 3. 화백나무의 통나무 直徑이 增大함에 따라 心材部直徑도 增大하며, 邊材部의 두께 亦是 점차 增大하다가 통나무直徑이 一定한 크기 以上으로 되면, 그 두께가 아주 微微하나마 減少되는 傾向이 있으며, 아울러 邊材率은 直徑이 增大할수록 減少되는 事實을 알 수 있었다. The results obtained from the investigation of the relations among the log-diameter, the heart wood-diameter, and the sap wood rate of Sawara-Cypress planted on the arboretum of our college are as follows: 1) Remarkable the significance of difference is admitted because the empirical formula d=0.75698 D-0.12244 which is used in finding the heart wood-diameter in the log-diameter of Sawara-Cypress is decided and correlation coefficient r=0.9901±0.0027 between the two diameters is calculated. 2) The relation between the log-diameter and the heart wood-diameter of Sawara-Cypress is understood as the almost straight line. 3) According as the log-diameter of Sawara-Cypress is enlarged the heart wood-diameter is enlarged and also the thickness of the sap wood is gradually enlarged, but according as the log-diameter reaches to a certain scope the thickness of the sap wood shows tendency to decrease slightly and the sap wood rate is decreased according as the log-diameter is enlarged.