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>

선인장 양심실 보조장치의 설계 및 임상적용을 위한 평가

민병구,박찬영,최재순,이혁수,황창모,김삼성,윤걸중,김종원,선경,이경갑,정종태,김원곤 제주대학교 인공심장이식연구소 2001 인공심장 연구 Vol.2 No.1

현재 개발되고 있는 맥동형 이식형 인공심장은 완전이식형 인공심장과 좌심실보조장치 뿐이다. 좌심실보조장치를 장착한 환자의 10~15%가 우심실의 보조를 필요로하고 완전이식형 인공심장의 장착을 위해서는 자연심장을 제거해야하는 상황에서 이식형 양심실보조장치에 대한 필요성이 대두되고 있다. 본 연구진은 완전이식형 인공심장으로 개발된 한국형 인공심장을 개선하여 양심 실 보조장치를 개발하였다. 양심실보조장치는 이동형 작동기식 미케니즘을 이용하고 있으며 에너지 변환장치와 감속기로 구성된 작동기와 혈액주머니, 그리고 내장형 제어기로 구성되어 있다. 선인장 펌프로 명명된 KAH350은 캐뉼라의 연결을 위한 커넥터를 포함하여 길이 177mm, 폭 164mm, 높이 67 이고 무게 780g이며 최대 심박출량은 5L/min 이다. 양심실보조장치로 개발된 선인장펌프는 좌심실보조장치로도 응용이 가능하다. 이식적합성과 생체적합성을 평가하기 위하여 좌심실보조장치로 5회, 양싱실보조장치로 6회의 동물실험을 수행하였다. 각각 최장 28일간 생존하였으며 11회의 동물실험중 장치의 결함에 의한 것이 3회 있었는데 이들은 모두 전자장치의 결함과 방수처리문제였다. 현재 이식적합성과 일박출량을 향상시킨 KAH400모델이 개발중이다. The types of pulsatile implantable artificial hearts that are on the way of development and have been developed are totally implantable artificial heart and implantable left ventricular assist device (LVAD). Approximately 10% to 15% of all patients Implanted with wearable VADs have required right heart support with another device. And it is reluctant to patient who should remove his or her own heart to be implanted with total artificial heart. These situations drive the development of implantable bi-ventricular assist device (BVAD). The Korean BVAD was develophed by modifying the moving actuator type Korean artificial heart. This electro-mechanical BVAD comprises actuator including energy converter and reduction gear train, blood sacs, and internal motor and energy controllers. The KAH350 which is named as 'Cactus Pump' is 177mm in length, 164mm in width, and 67mm in thickness including connectors and nuts. The weight and maximum cardiac output of Cactus Pump is 780g and 5L/min, respectively. The Cactus Pump that was developed as BVAD could be used as LVAD by attaching compliance caps on the 2 ports of one ventricle. The animal experiments were undergone 5 times for LVAD, and 6 times for BVAD. The best records were 28 days survival in both applications. There were 3 times of device failure and they were all associated with electrical connection and hermetic sealing. The KAH400 that has improved anatomical fitting characterisitcs and stroke volume is on development.

이산 웨이브릿 워터마킹을 이용한 디지털 이미지 보호

김국세,이정기,박찬모,조애리,류천열 조선대학교 전자정보통신연구소 2003 電子情報通信硏究所論文誌 Vol.6 No.1

정보통신의 비약적인 발전에 힘입어 멀티미디어 데이터는 언제 어디서든 전송 받거나 공유할 수 있게 되었다. 아날로그 형태에서 디지털의 아날로그를 형태로 빠르게 대체되고 있으며, 디지털로 신호를 표현하는 방법은 기존 사용하여 표현하는 방법에 비해 많은 장점을 가지고 있다. 하지만 디지털로 된 데이터는 언제 어디서든 대단위 복제가 가능하다. 디지털 영상 정보의 보호를 위해 디지털 워터마크(Digital Watermark)가 있다. 디지털 워터마크는 공개키 알고리즘이나 방화벽 등으로 해독된 영상에 대하여 부가적인 보호를 제공한다. 디지털 영상에 대한 저작권 정보, 배포자 정보 그리고 사용자 정보를 영상에 삽입함으로써 훗날 법적인 문제가 발생하였을 때 해결책을 제시할 수 있다. 본 논문에서는 디지털 영상 데이터의 정보 보호를 위해 주파수 영역에서의 웨이브릿 변환(Wavelet Transform)을 이용한 이미지 적용 디지털 워터마킹(Image-Adaptive Digital Watermarking) 방법을 제안한다. 이미지 적응 웨이브릿(Image-Adaptive Wavelet)은 영상을 주파수적으로 분해하면서 각 대역들의 공간 영역에서의 정보를 함께 지닌고 JND긯(Just noticeable difference)을 포함한다. 이미지 적응 웨이브릿의 이러한 특성을 이용하여 다해상도 분해하고, 손실 압축(Loss Compression)이나 필터링(Fitering), 잡음(Noise)등에 크게 영향받는 저주파 성분과 인간의 시각적으로 큰 의미를 갖는 고주파 성분의 특성을 이용하여 워터마크를 삽입한다.

청소년의 심리요인이 스포츠 소비행동에 미치는 영향

김찬룡,이근모 釜山大學校 附設 體育科學硏究所 1999 體育科學硏究所 論文集 Vol.15 No.-

The purpose of this study was to research that how the use of mass media, preference of professional sports and psychological factors effect consumer behaviors of high school students through the questionnaires. For this study, researcher analyzed the questionnaires through χ 2 test and multiple regression. The result of this study is as follows; 1) In the preference in professional sports events, both male and female students preferred soccer and basketball. 2) Regardless sex and department of school, T.V and magazine were preferred and male students who attend department of humanity higher relied on newspaper in the preference in choosing the media for information related consumer behaviors. 3) Reliability and preference significantly effected on both male and female students in the frequency of watching professional T.V sports program. 4) Reliability and preference significantly effected on male students as order in the frequency of reading newspaper article related professional sports.

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.

국제 경기를 통한 스포츠 산업의 활성화 방안

김인형,최동일,남희은,이근모,김찬룡 釜山大學校 附設 體育科學硏究所 1998 體育科學硏究所 論文集 Vol.14 No.-

This study was mainly focused on the relationship between sports industry and international games. According to the category of both sports information ·service industry and sports technology industry. The way of activating sports industry by international games is proposed as follows; 1. Sports information · service industry 1) Sports Event (1) Expending the inducement of sports event sponsored by domestic international enterprises. (2) Improving image of enterprise by activating character industry. (3) Elevating the mood of international games by pre-event and post-event. (4) Attracting tourist during games session by opening various cultural and artistic events. 2. Media (1) Establishment of Media facilities such as international broadcasting center or media center. (2) Providing best media services by digitalizing every kind of broadcasts. (3) Using aggressive internet advertisement of game's information, cultural events, tourism, and etc. 3. Sports Event Tourism (1) Providing sports event package tourism. (2) Rehabilitating accomodation and convenience facility at the level of advanced country. (3) Building sports theme complex well international sports heros are taken as theme. (4) Building sports mall well every sports-related businesses can be a solved as one-stop service. 2. Sports technology industry 1) Sports Facility (1) Founding the organization of which mission is to induce long-term fund for building and repairing sports facilities. (2) Acquiring economic benefit by selling the right to call sports facilities after company names. (3) Building all weather and multi-purpose sports facilities and practically using after games. 2) Sports Goods (1) Following consumers' demand for design and colors of goods. (2) Developing marketing strategy by opening sports goods expo. (3) Reinforcing the information network among company groups. (4) Acquiring government support for developing sports goods marketers. (5) Developing new kind of leisure goods.

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.

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.

분산 공유 메모리 시스템 설계에 관한 연구

박찬모,김정애,이준 조선대학교 동력자원연구소 1997 動力資源硏究所誌 Vol.19 No.1

With the development of computer network, parallel programming on distributed system is becoming an attractive way to increase the computing power. The idea is to link together a set of processors to obtain a powerful parallel system. The limitation of the resulting systems is that no common physical address space is available for data storage. In this paper, we frist describe the motivation of the distributed shared memory system and introduce the Parallel Virtual Machine on which our DSM(Distributed Shared Memory) system is based. We describe the requirements of the DSM system and design the model of the DSM system that provides the distributed shared memory on top of a message passing distributed memory system.

발생원별에 따른 PAHs 배출특성

박찬구,윤중섭,김민영,손종열,모세영 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.3

The results of individual PAH source profiles that can be applied to receptor model are as follows. The sum of 16 PAH concentrations was 391.41 ng/S㎥ in a tunnel. Phenanthrene was the most abundant compound among 16 PAH, and then pyrene, fIuoranthene, anthracene, and naphthalene can be seen in elevated contents. 11,056.61 ng/S㎥ of 16 PAH concentrations in BC oil boiler was two times higher than 6,582.57 ng/S㎥ of those in LNG boiler. Naphthalene was the most abundant compound in both facilities. Phenanthrene, anthracene. and acenaphthylene were the second dominant compound group in order from both facilities. BC oil boiler had relatively high concentration of pyrene compared to LNG boiler that had high concentration of fluorene and did not detect pyrene. The sum of 16 PAH concentrations emitted from MSW incinerators after APCD (air pollution control device) was three times higher than those from MSW incinerators bcfore APCD. However, the concentrations of more than 4-ring PAH compounds (e.g., benzo (a)anthracene) before APCD were higher than those after APCD. This fact implies that PAHs generated by combustion process are eliminated in APCD and they are continuously produced in stack or atmosphere by PAHs precursors.