Site Preference for Fe in Zn-Doped Y-Type Barium Hexaferrite

Chin Mo Kim,Chan Hyuk Rhee,Chul Sung Kim IEEE 2012 IEEE transactions on magnetics Vol.48 No.11

<P>Polycrystalline Ba<SUB>2</SUB>Zn<SUB>x</SUB>Co<SUB>2-x</SUB>Fe<SUB>12</SUB>O<SUB>22</SUB> samples were prepared by solid state reaction method. The crystallographic structure and magnetic properties of the Zn-doped Y-type hexaferrite samples were investigated by X-ray diffraction, magnetization, and Mössbauer spectroscopy measurements. The crystal structure was found to be hexagonal with space group of <I>R</I>-3/<I>m</I>. The lattice constants of the samples increased as Zn contents increase. From the temperature dependence of magnetization, measured from 50 to 700 K, the magnetic transition temperature (<I>T</I><SUB>S</SUB>,<I>T</I><SUB>C</SUB>) of Ba<SUB>2</SUB>Zn<SUB>x</SUB>Co<SUB>2-x</SUB>Fe<SUB>12</SUB>O<SUB>22</SUB> decreased with increasing Zn concentration. Mössbauer spectra of Ba<SUB>2</SUB>Zn<SUB>x</SUB>Co<SUB>2-x</SUB>Fe<SUB>12</SUB>O<SUB>22</SUB>(x=0,1) were obtained at various temperature ranging from 4.2 to 300 K. Based on the observed spectra, the site occupancies in six interstitial sites of Co, Zn and Fe ions were calculated from the average of the relative sub-spectra absorption areas. Increasing Zn contents, the Debye temperature of the samples decreased. The isomer shift values of the samples at various temperatures were 0.1 <; δ <; 0.45mm/s, relative to the Fe metal, which were consistent with the Fe<SUP>3+</SUP> valance state.</P>

부분입체선택적 Zwitterionic Claisen 전위반응

柳燦模,崔夏洵,李宗昊,鄭元爀 성균관대학교 기초과학연구소 1995 論文集 Vol.46 No.2

Aza-Claisen rearrangement through the zwitterionic intermediate is described. This reaction was able to carry out at low temperature(-78∼0℃) and also exhibited high diastereoselectivities. The formation of zwitterionic intermediate was realized by addition of t-crotylamine to the ketene formed from deprotonation of corresponding acyl halide. The electronically neutral product was achieved through the [3,3]-sigmatropic rearrangement of self-promoted zwitterionic intermediate in high diastereoselectivity due to lower reaction temperature. Treatment of N-crotylpiperidine with propionyl chloride in the presence of K_2CO_3 at 0℃ for 1 h gave threo selective(97 : 3) amide in 41% isolated yield.

압박 고 나사로 치료한 대퇴골 전자부 골절 : 고정 실패의 인자에 대한 분석 Analysis of Factors associated with Failure of Fixation

유찬훈,김홍태,변영수,남준모,조영호,문성건 대한골절학회 2002 대한골절학회지 Vol.15 No.4

목 적 : 압박 고 나사로 치료한 대퇴골 전자부 골절의 고정 실패에 영향을 미치는 요소에 대하여 분석하고자 하였다. 대상 및 방법 : 1995년 5월부터 2000년 7월까지 대퇴골 전자부 골절을 압박 고 나사를 이용하여 치료하고 1년 이상 추시가 가능했던 97예를 대상으로 하였다. 골절의 분류는 Jensen 분류법을, 골다공증의 정도는 Singh 지수를 이용하였다. 술후 방사선 검사에서 경체각, 정복 상태, 지연 나사의 대퇴골 두 내 위치, tip-apex distance(TAD) 및 지연 나사의 활강 거리를 측정하였고 고정 실패에 미치는 영향을 통계학적으로 분석하였다. 결 과 : 97예 중 17예(17%)에서 고정 실패가 발생하였고 그 중 지연 나사의 과도한 활강으로인한 경우가 15례(15.4%), 골두 천공 1얘, 10도 이상의 외반 변형 1예였다. 고정 실패의 발생과 80세 이상의 고령, 불안정성 골절, telescoping 정복, 원위 골편의 내측 혹은 전방 전위, 대퇴골 두 내 지연 나사의 위치와 밀접한 관계가 있었다. 결 론 : 압박 고 나사를 이용한 대퇴골 전자부 골절의 치료에서 고정 실패를 방지하기 위해서는 정확한 정복이 필요하고 대퇴골 두 내에서 지연 나사의 전방 위치를 피하는 것이 좋을 것으로 사료된다. Purpose : This study was performed to analyze the significant factors that may affect failure of fixation in trochanteric fractures of the femur treated with the compression hip screw. Materials and Methods : From May 1995 to July 2000, the authors analyzed 97 cases of trochanteric fracture of the femur treated with the compression hip screw and followed more than one year. We classified the fracture type by Jensen's method. We used Singh index for the degree of osteroporosis. In the post-operative radiograph, we checked neck-shaft angle, state of reduction, position of the lag screw within the femoral head, tip-apex distance, and sliding distance of the lag screw. The relationship between these factors and failure of fixation was statistically analyzed. Results : There were 17 cases(17.5%) of failure of fixation ; 15 cases(15.4%) of excessive sliding of the lag screw, 1 case (1%) of cutting out of the lag screw, and 1 case (1%) of valgus malunion. There were significant relationship between failure of fixation and old age over 80 , unstable fracture, telescoping reduction, anterior or medial displacement of the distal fragment, and anterior placement of the lag screw within the femoral head. Conclusion : Accurate reduction and avoidance of the placement of the lag screw in the anterior part of the femoral head were important factors to prevent failure of fixation in trochanteric fractures of the femur treated with the compression hip screw.

새로운 [3,3]-Sigmatropic Rearrangement를 이용한 입체선택적 아미드의 합성

柳燦模 성균관대학교 기초과학연구소 1993 論文集 Vol.44 No.2

새로운 [3, 3]-sigmatropic rearrangement를 통한 효율적인 입체선택적 amide 합성경로를 개발하였다. 키틴과 3차알릴아민의 부가물의 전위로 97:3의 입체선택적으로 amide가 생성되었다. 이 방법론은 비고리화합물의 입체선택적 합성에 넓은 응용성과 효율성을 나타내었다. A diastereoselective synthetic route to amide through novel [3, 3]-sigmatropic rearrangement has been developed. Rearrangement of adduct between ketene and t-allyamine afforded amide with 97:3 diastereoselection. The method exibited wide applicablity and efficacy for the stereoselective synthesis of acyclic system.

우리나라 근대무용의 발전과정

정찬모,이미경 한국체육사학회 2002 체육사학회지 Vol.10 No.-

The purpose of this study was to review the development of Korean modern dance from its traditional dance to its creative dance. For this purpose, the transition or development from traditional dance to modern dance was examined, and thereby, concepts of the modern dance and its historical implications were reviewed longitudinally. In terms of historic and social backgrounds, the development of our modern dance for the period of 1895 ~ 1979 was featured by dividing it into four stages: initial period, growth period transitional period and developmental period. During the Japanese colonial period our traditional dance was promoted to theater dance, which helped to enhance people's awareness of our traditional dance. By 1926, the Japanese dancer Ishi Baku(石井漠) came Korea only introduce the Western dance to our dance community, and as a result, such world-renowned dancers as Choi Seung-hee and cJo Taek-won emerged. While Korea was emancipated from Japan and suffered for the Korean War, our dance community witnessed the efforts to recover the traditional dance with the vigorous cultural movement and search for our own dance aesthetics. After all in 1979, our dance community would witness a traditional dance festival conducive to creative dances. Summing up, the traditional dance was promoted around 1900 when it was presented on the stage, and thereby, many professional dancers began to be engaged in dance. On the other hand, the professional dancers pursued a modern art form, and thus, their social status was enhanced. Thus, in the history of our dance, the modern dame is very significant in that it linked the traditional dance with the creative one.

10대 청소년의 프로농구 경기 관람 행동에 관한 연구

김찬룡,이근모,이상돈 부산대학교 체육과학연구소 2000 體育科學硏究所 論文集 Vol.16 No.-

The purpose of this study was provide a data to establish marketing strategies of companies and association relative Professional Basketball. A questionaire was designed to measure spectator behaviors of Professional Basketball in Teenagers. The sample of study was drawn from 351 spectators of Professional Basketball in Pusan. The results of this study are as follows: 1) In the difference of interest in stadium facilities, game satisfaction, companies promotion were all higher in male than female. 2) In the difference in came satisfaction of mercenary participation in game, interest in companies promotion was higher in group perceived companies promotion satisfaction than another.

1930년대 한효의 문학비평 고찰

박찬모 현대문학이론학회 2004 現代文學理論硏究 Vol.0 No.22

The purpose of this study is to make investigation into the characteristics of Han Hyo's criticism which had deployed in latter 1930's. Existing studies on the Han Hyo's criticism were very loose and performed only in respect of its reception, even if it is studied in the context of modern literary criticisms. Properly the essential aspect has been ignored. By very reasons of these, to adjust in order his critical accomplishment which had continued to division of Korean peninsula and to give some supplementary explanation to the historical system of Korean modern literary criticism, this study aimed at Han Hyo's criticism. To appreciate the characteristics of Han Hyo's criticism, this study borrowed some conceptions of Michel Foucault; Discourse, Other, Knowledge-Power. The strategies of Han Hyo, devised to penetrate the principles of socialist realism, are inquired out. They are 'will toward truth', 'principle of genus' and 'horizontal arrangement of objects'. Investigation into these strategies shows that as an extension of KAPF's literary criticism Han Hyo's socialist realism is a result of antithetical thought of identity which is inclined to 'theory' and 'content'.

양자화와 퍼지룰에 의한 퍼지 제어기 성능 향상

禹讚溢,李俊模 관동대학교 1997 關大論文集 Vol.25 No.2

Since the fuzzy inference algorithm wastes a lot of time, the look-up table was used in order to reduce the wasted time. This algorithm has the disadvantage that shows the side vibration at the target point. In this paper, we proposed that the method of reducing the speed of convergence and vibration at the target point on calculating the membership degree about input value without a look-up table was proposed. And its effectiveness in the inverted pendulum was acquired. It is possible to accurately control the inverted pendulum by using the proposed method that controls the quantized level for speed of convergence, and changes the number of rules for reducing the vibration at the target point. In the case of a wide quantized level, the speed of convergence was better than at a narrow quantized level. And at the target point the vibration was irregular with a small number of rules. But by increasing the number of rules the vibration was constant and fixed.

빅 스포츠 이벤트(월드컵) 개최와 스포츠관광 발전방안

이근모,이재형,김찬룡 釜山大學校 附設 體育科學硏究所 2001 體育科學硏究所 論文集 Vol.17 No.-

The purpose of this study is to provide ways of developing sport tourism by Investigating the trends, previous studies and theoretical background of the tourism and economic effects of big sport events, with reference to related previous literature, journals, reports, materials related to sport tourism and survey results published by Korea National Statistical Office. The Following is the conclusion suggested based on results of the study. First, participation by people of the community needs to be promoted. Especially, big sport events require systems that make possible active participation and support by people of the community. Those systems may include means of forming and collecting opinions such as open briefing, public hearings and seminars, organizations for management or consultation whose member include representative of the community, and volunteering service systems as established and strengthened as can be seen in foreign countries. Second, pre-and post evaluation system should be introduced. Like in other events big sport events have their own final and process purposes. The latter is related to the way of forming and managing sport event organizations, while the former is about ultimate results pursued by sport event. The better accomplishment of the final purpose requires understanding how sport event. The better accomplishment of the final purpose requires understanding how sport events incorporate aspects of tourism. The understanding can be made through evaluation effects of sport events before, during and after the events. Third, whether criteria of the purpose accomplishment of sport events are fulfilled can be determined through the financial analysis and economic efficiency evaluation of the events, the investigation of thoughts and attitudes by people of the community, the examination of perceptions and types of tourists and the evaluation of economic effects of those events. These processes need to be performed with consistency before, during and after sport events. Fourth, products of sport tourism need to bo developed continuously. Big sport events may attract a great attention from mass media around the world by using a variety of tourist information strategies including cultual events celebrating the ground-breaking, construction or opening of port stadiums, pam tours inviting foreign reporters and journalists which I turn lead to the production of relevant, appealing special shows, and programs showing real tastes of Korean culture. Supportive events related to Korean traditional musics, dances, martial arts, foods, pure arts and literature should be also provided to raise the atmosphere and images of sport event as well as inform this nation's history and culture. Firth, sport tourism marketing should be strengthened. Generally sports and tourism have been treated separately. But it is mow recognized that the two parts are closely correlated. such correlation between sports and tourism should be more developed. on which relevant marketing business need to be promoted.

스포츠 스폰서십 요인과 스포츠 소비자 행동에 관한 연구

이근모,김찬룡,이재형 釜山大學校 附設 體育科學硏究所 2001 體育科學硏究所 論文集 Vol.17 No.-

The purpose of this study was to analyze that sport Consumer behaviors related sports sponsorship through meta- analysis. The result of this study was concluded as follows: 1. Male, teenager affirmed factors related sports sponsorship, act an good purchase intent more than female. 2. Higher sports participation degree groups affirmed factors related sports sponsorship, act as good purchase intent. 3. Company advertisement participated sports sponsorship affirmed, company image's reliability, and act an good purchase intent more than company advertisement not participated sports sponsorship. 4. Sports sponsorship affirmed reliability, development company image, development reliability, attitude that related company image act an good purchase intent.