5 GHz 무선랜 응용을 위한 소형 광대역 MEMS 안테나

김지혁,김현철,전국진,Kim Ji-Hyuk,Kim Hyeon Cheol,Chun Kukjin 대한전자공학회 2006 電子工學會論文誌-TC (Telecommunications) Vol.43 No.2

MEMS 공정을 이용하여 작은 접지면과 광대역 특성을 가지는 소형 안테나를 제작하였다. 광대역 특성을 얻기 위해서 다층기판을 사용하였으며, 패치 안테나는 네개의 패치로 나누어져 있고 각각의 패치는 금속선으로 연결되어 있다. 한 개의 마스크 공정으로 간단한 제작이 가능하다. 두개의 마이크로스트립 안테나를 만들었다 A 타입 안테나는 패치들이 금속선으로 연결된 안테나이고 B 타입 안테나는 금속선으로 연결이 안된 안테나이다. 제안된 안테나의 크기는 $8{\times}12{\times}2mm^3$ 이었으며 측정결과 A 타입은 5.3GHz 중심주파수에 420MHz 대역폭, B 타입은 5.66 GHB중심주파수에 480MHz 대역폭을 가지는 것으로 나타났다. A small size broadband microstrip patch antenna with small ground plane has been fabricated using MEMS. Multiple layer substrates we used to realize small size and broadband characteristics. The microstrip patch is divided into 4 pieces and each patch is connected to each other using a metal microstrip line. The fabrication please process is simple and only one mask is needed. Two types of microtrip antennas are fabrication Type A is the microstrip antenna with metal lines and type B is the microstrip antenna without metal lines. The size of proposed microstip antenna is $8{\times}12{\times}2mm^3$ and the experimental results show that the antenna type A and type B have the bandwidth of 420MHz at 5.3 GHz and 480MHz at 5.66 GHz, respectively

웹 기반 방송정보시스템 개발에 관한 연구

김지혁,염창선,Kim, Ji Hyuk,Yum, Chang Sun 한국스마트미디어학회 2017 스마트미디어저널 Vol.6 No.1

최근 방송사는 인터넷, 케이블 TV, DMB(Digital Multimedia Broadcasting) 등으로 대표되는 뉴미디어의 등장이라는 사회적 환경 변화와 방송통신 융합이라는 정책적 환경 변화를 겪고 있다. 이러한 변화를 극복하기 위해, 방송사는 새로운 방송정보시스템 구축에 많은 관심을 보이고 있다. 본 연구는 중소 규모의 방송사에 적합한 웹 기반 방송정보시스템의 개발 과정을 제시한다. 이를 위해 시스템 구성도, 업무기능 관계도, 업무흐름도, 개체관계성도, 주요 프로그램, 사용자인터페이스 등을 기술한다. 본 연구에서 제시된 웹 기반 방송정보시스템은 사내외에서 신속한 의사결정과 업무처리를 가능하게 하여 업무 생산성을 제고할 것으로 기대된다. Recently, broadcasting companies have been faced with changes in social environment, particularly, the emergence of new media, including the internet, cable TV and DMB, and in the political environment, such as convergence in broadcasting and communications media. To cope with these changes, broadcasting companies are showing increasing interest in building new broadcasting information systems. This study presents how to develop a web-based broadcasting information system for the small and medium-sized broadcasting company. For developing the system, the study describes system configuration, business function relationship diagrams and business flow diagrams, entity relationship diagrams, major programs, and graphic user interfaces. The newly developed web-based broadcasting information system is expected to increase business productivity to a significant extent through faster decision-making and business execution in and out of the company.

Effect of plants extract, organic acids and prebiotics on growth and intestinal mucosa development in growing broilers

Ji-Hyuk Kim(김지혁),Hwan Gu Kang,Pratima Adhikari,Chan Ho Kim,Ik Soo Jeon,Jong-Wan Lee,Gye-Woong Kim,Hack-Youn Kim,Woo Kyun Kim 한국가금학회 2015 한국가금학회 정기총회 및 학술발표회 Vol.2015 No.11

A total of 528 broiler chicks were randomly distributed to 11 dietary treatments to give 6 replications per treatment and distributed as 8 birds per pen. Feed and water were provided ad libitum with 24 h of lightning and total experimental days were 21. The diets were formulated to contain 23% CP and 3200 Kcal/kg ME. Essential AA and vitamin-mineral premix were formulated to meet or exceed minimum standard suggested by NRC (1994). Experimental diets were T1= NC, T2= PC, T3= NC+0.01% Plants extract, T4= NC+0.03% Plants extract, T5= NC+0.06% Plants extract, T6= NC+0.4% Organic acids, T7= NC+0.6% Organic acids, T8= NC+0.8% Organic acids, T9= NC+0.4% Prebiotics complex, T10=NC+0.6% Prebiotics complex, T11= NC+0.8% Prebiotics complex. Feed intake and Feed conversion ratio(FCR) were the lowest in 0.1% Plants extract treated group when compared to NC group. Body weight gain was not differ significantly among all treatments. Crypt depth in jejunum and ileum increased in Prebiotics complex groups when compared to other treatments.

채종박과 밀기울에 대한 오리의 분과 회장 소화율 비교

김지혁(Ji-Hyuk Kim),강환구(Hwan-Gu Kang),방한태(Han-Tae Bang),황보종(Jong Hwangbo),최희철(Hee-Cheol Choi),김동욱(Dong-Wook Kim),홍의철(Eui-Chul Hong) 한국가금학회 2015 韓國家禽學會誌 Vol.42 No.1

& & 본 시험은 밀기울과 채종박에 대한 육용오리(Pekin종, 평균체중 3.4 kg)의 소화율을 평가하기 위해 수행하였다. 6주령 육용오리 90수를 선별하여 대사케이지에서 1주간 사육하며 소화시험을 수행하였고, 시험사료는 밀기울과 채종박을 이용하였다. 시험설계는 사료원료에 따른 3처리구, 처리구당 6반복, 반복당 5수씩을 완전임의 배치하여 시험을 수행하였으며, 시험이 끝난 후 분과 회장에서 소화율 측정용 시료를 채취하였다. 처리구와 시료 채취 부위에 따른 일반 성분의 소화율은 조단백질과 조지방을 제외한 성분들에서 기초사료의 분 소화율이 가장 높았으며, 채종박의 회장 소화율이 낮게 나타났다(P<0.01). 처리구 간 비교에서 기초 사료의 소화율이 가장 높았고, 밀기울의 소화율이 가장 낮았다(P<0.05). 분과 회장 소화율의 비교에서도 조단백질과 조지방에서는 회장 소화율이 분의 소화율보다 높게 나타났다(P<0.05, P<0.01). 처리구와 시료 채취 부위에 따른 아미노산의 소화율은 기초사료의 분 소화율이 가장 높았으며, 채종박의 회장 소화율이 가장 낮게 나타났다(P<0.01). 처리구간 비교에서는 필수 아미노산 중 iso-leucine, leucine 및 phenylalanine, 비필수 아미노산 중 alanine, glycine 및 tyrosine은 대조구와 밀기울 급여구, 밀기울과 채종박 급여구 사이에서는 유의적인 차이가 없었다. 그러나 이들 아미노산의 소화율은 대조구가 채종박 급여구에 비해 높았다(P<0.05). 다른 아미노산들은 처리구에 따른 유의적인 차이를 보이지 않았다. 본 연구를 통해 오리에 의한 밀기울과 채종박의 소화율에 대한 정보를 제시하였으며, 도출된 결과들은 오리 사료의 최적 배합을 위한 기초자료로 활용될 수 있다. & & This work was carried out to evaluate the feces and ileal digestibility of canola meal and wheat bran in ducks. Ninety Pekin ducks (6-week-old, average 3.4 kg) were divided into three treatments (6 replications/treatment, 5 birds/replication) by feedstuffs (basal diet, canola meal, and wheat bran) and were fed on these diets in individual metabolic cages for one week. After one week, the samples for analysis were collected from feces and ileum. On comparison of treatments and collected sites, the feces digestibility of basal diet was the highest among treatments on chemical compositions except crude protein and crude fat and ileal digestibility of canola meal was the lowest (P<0.01). On comparison of treatments, the digestibility of basal diet was higher and that of wheat bran was lower when compared to other treatments (P<0.05). The feces digestibility was lower than the ileal digestibility in crude protein (P<0.05) and crude fat (P<0.01). The digestibility of amino acid was the highest at feces of control group among treatments (P<0.01). No significant difference was detected in terms of digestibility of isoleucine, leucine and phenylalanine among essential amino acids, and alanine, glycine and tyrosine among non-essential amino acids between control and wheat bran, and wheat bran and canola meal. However amino acid digestibility was higher in control group when compared to canola meal group (P<0.05). Other amino acid digestibilities were not significantly differ by treatments. These results may provide the basic data on amino acid digestibility of ducks to evaluate feedstuffs and to formulate optimum diet for commercial Pekin duck.

스포츠 인권의 노력, 《구별짓기》를 멈추기 위한 현상학적 접근

김지혁(Kim, Ji-Hyuk),안재찬(An Jae-Chan) 한국체육철학회 2022 움직임의철학 : 한국체육철학회지 Vol.30 No.2

태권도학과 교육과정 분석을 통한 학문적 정체성 찾기

김지혁(Kim, Ji-Hyuk) 한국체육철학회 2022 움직임의철학 : 한국체육철학회지 Vol.30 No.3

이 연구는 1982년 최초로 태권도학과가 신설된 이후 대학 및 학과의 교육목표와 교육과정이 「태권도학」 고유의 독자적 학문성과 교육적 방향성을 명확하게 제시하고 있는지, 나아가 태권도학과 전공생이 오늘날 사회가 요구하고 있는 직무 및 역량을 개발하고 수행하는데 있어 태권도학과 교육과정이 합리적으로 구성되어 있는지, 이를 토대로 태권도학과 졸업생이 해당 분야 전문인력으로 그 자격을 충족하고 있는지 통합적인 관점에서 분석하고, 괴리가 발생하는 지점을 파악하여 대학 내 태권도학과 교육과정 개편의 필요성을 제시하고 대학 내 태권도학의 정체성을 확립하는데 목적이 있다. 이를 요약하면 첫째, 태권도학과의 교육목표는 공통적으로 ① 문무를 겸비한 국제적 전문 지도자 양성, ② 학문적 연구 및 정립 등으로 요약된다. 둘째, 태권도학과의 교육과정은 대부분 지도자 양성을 위한 전공 교과로 집중되어 있는 반면, 학문적 연구 및 정립을 위한 관련 교과는 턱없이 부족한 실정이다. 셋째, 태권도학과는 전문 지도자 양성에 목표를 두고 있음에도 불구하고 국가공인 체육지도자 자격검정 관련 교과의 교육과정은 아직 마련되어 있지 않다. 이를 종합하면 결국 태권도학과의 교육목표와 교육과정에 괴리가 있음은 물론, 졸업 후 사회에서 요구하는 인재 양성에 부합하지 못하고 있음을 의미한다. 따라서 연구자는 대학 내 태권도학과가 신설되었던 설치 목적을 다시 점검하고 태권도학의 정체성을 찾기 위해 국내 태권도학과 교육과정 개편이 절실하게 필요한 시점임을 밝힌다. This study examines whether the educational goals and curriculums of universities and departments since the establishment of the first taekwondo department in 1982 clearly presents the unique academic and educational direction of taekwondo departments. Furthermore, this article looks at whether taekwondo department majors are rationally composed of taekwondo curriculums in developing and performing the duties and competencies that society is demanding today. In addition, this study scrutinizes whether taekwondo graduates meet their qualifications as professionals in the relevant field. Based on this, this study looks at where educational gaps occur. The purpose of this study is to present the necessity of reorganizing the curriculum of taekwondo departments in universities and to establish an identity of taekwondo departments at universities as an academic field. In summary, at first, the educational goal of taekwondo departments is the training of international professional leaders who have the common task of educating students professionally. Secondly, the curriculum of taekwondo departments is mostly focused on training instructors, while the related curriculum for academic research and establishment is insufficient. Lastly, despite the goal of training professional leaders, the curriculum of the nationally recognized physical education instructor qualification test is not yet prepared. In conclusion, there is a gap between the educational goals and the curriculum of taekwondo departments. Moreover, the education in these departments does not meet the training of human resources required by society after graduation. Therefore, the researcher re-examines the purpose of establishing taekwondo departments at universities and suggests that it is urgent to reorganize the curriculum of domestic taekwondo departments in order to find an identity for taekwondo.

스포츠 인권의 시작, 구분짓기 지우기

김지혁(Kim, Ji-Hyuk) 한국체육철학회 2021 움직임의철학 : 한국체육철학회지 Vol.29 No.3

도심공원 걷기코스에서 제공되는 음악의 템포와 남녀 연령별 자유보행 패턴의 변동

김지혁(Ji-Hyuk Kim),손지은(Jee-Eun Son),이대택(Dae-Taek Lee) 한국생활환경학회 2008 한국생활환경학회지 Vol.15 No.2

This study evaluated whether the walking patterns can vary during unrestricted fTee walking at inner city park trail while different tempo of music is provided. Unnoticeable video recordings were performed at one of the city park trail. During the recording, one of the three background musics; no music (NM), slow music (SM, <76 beat/min), fast music (FM, >120 beat/min) was provided. A total of 1,244 walkers' data was analyzed for step length (SL), step rate (SR), and walking speed (Speed) while comparing among sex and three age groups; young (YG, <30 yrs), middle (MG, 31-59 yrs), and old (OG, ≥60 yrs). Men and women both walked faster in FM than NM and SM, and men walked faster than women (P<O.05). SR was higher in FM (P<0.05), but no sex differences were found among conditions. SL showed the highest in FM, but the values were higher in men than women in all conditions (P<O.05). Speed was higher in YG and MG of both sex, however, except YG of men, the increased Speed was attributed to elevated SL only without changes of SR. The walking patterns of OG were not influenced by any musics. In conclusion, the slow music did not modifY walking speed while the fast music resulted in increased walking speed during walking in trail. The increased speed at fast music was possible by both increased stride length and rate. Man was faster than woman, in which the stride length for man was greater than woman. The older group did not showed any responses to musical background.

체육학의 철학적 고찰

김지혁(Kim, Ji-Hyuk) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.4

The purpose of this study is not only to shed new light on the structure of kinesiology which is on an academic plateau, but also to found the orientation of kinesiology by following the foundation-discipline, considering somewhat degenerated kinesiology in a reflective way and understanding the nature root of it. As the result of the study, the researcher have come to following conclusions to accomplish the purpose of the study and give an academic direction of kinesiology, First, kinesiology is built up the whole body of its own focus, method and knowledge. Also It is confirmed of the existence as the independent discipline based on human movement. Second, the current structure and direction related to the identity of kinesiology are aimed at continuous dividing progress by differentiating from the foundation-discipline. This aspect encounters problems such as the descent of kinesiology from to the auxiliary-discipline, the gap in the application of research result to reality and the relationship problem between the cooperation-discipline which is supposed to be upgraded from ‘subordination’ to ‘adjacency’. So kinesiology has been in the face of the identity crisis. Third, as one of the alternatives to solve above problems, the fusion of ‘humanities and social science’ and ‘natural science’ is essential for kinesiology to accept its limitations as the applied-science and also have its own academic discipline. But the one-sided addition must be sublated. And it should be proceed after expecting the achievement of the fusion strictly and examining them. In other words, the investigation of achievements which could be made by the interdisciplinary research of departmental studies has to be preceded. Lastly, sport scientists keep agonizing about what the consilient core subject is and what the method of making a valuable achievement is by the interdisciplinary research. If the fusion of knowledge is the reality that kinesiology is facing, it can also look forward to ‘the fusion research’ of sport scientists for solving these problems.

파장선택적 필터를 이용한 태양광/태양열 복합 발전소의 전력생산량 비교

김지혁(Ji Hyuk Kim),니콜라스 리우(Nicholas Liew),이현진(Hyun Jin Lee) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.11