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.

TRNSYS를 활용한 열병합 발전기의 운전에 따른 폐열 회수량 및 온도분포 특성 파악

김지혁(Ji-Hyuk Kim),안준(Joon Ahn) 한국유체기계학회 2019 유체기계 연구개발 발표회 논문집 Vol.2019 No.11

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

가금의 살모넬라 제어를 위한 사료의 이화학적 처리와 사료첨가제의 활용

김지혁(Ji-Hyuk Kim),김학연(Hack-Youn Kim),김봉기(Bong-Ki Kim),김계웅(Gye-Woong Kim) 한국가금학회 2018 韓國家禽學會誌 Vol.45 No.1

Salmonella infections in livestock industry cause various problems such as worsening animal welfare and productivity, damaging consumer confidence in the food safety of animal products. Chicken meat and eggs are known as major source of pathogen causing human foodborne infections. Therefore food safety concerns have prompted the poultry producers and governments to introduce the strategy and regulation to control these pathogens. Salmonella can persist for long periods of time in a wide range of spaces including feed bin, feed processing facilities, poultry farm, slaughterhouse, processing plants, etc. For the effective and constant Salmonella control, combination of pre-harvest, harvest and post-harvest measures should be considered comprehensively. The control measures would be most effective at farm level where the contamination initiates. Transmission of pathogen from feed origin to the live poultry and finally to the products was proven already. To control bacteria in the feed ingredients and formula feed, thermal processing, irradiation or chemical treatment may be applied. Chemical treatments to inhibit Salmonella in the feed involve the use of products containing organic acids, formaldehyde, or a combination of such compounds. However, recontamination which might occur during storage and transport process and/or by other various factors should always be under control and eliminated. Feed additives used to control Salmonella in birds’ gastrointestinal track can be of various types, including prebiotics, probiotics, organic acids and bacteriophages. Although their mode of action varies, they ultimately inhibit the colonization of Salmonella in the gut and improve the performance of birds. This review describes the strategies that could be adapted to the management of feedstuffs and the use of feed additives in pre-harvest stage to control Salmonella contamination in poultry farming.

Jonathan Edwards’s Spiritual Epistemology and Its Homiletical Implications

김지혁(Ji Hyuk Kim) 개혁신학회 2022 개혁논총 Vol.61 No.-

본 논문은 조나단 에드워즈의 마음의 감각 개념이 오늘날 설교자들에게 줄 수 있는 통찰이 무엇인지 규명하는 것을 목적으로 한다. 마음의 감각은 성도들이 중생할때 성령께서 주시는 새로운 영적인 감각인데, 성도들은 그 감각을 통해 하나님의 아름다움을 경험할 수 있게 된다. 에드워즈는 우리가 새 마음과 새 영을 얻기 위해외부로부터 주어지는 어떤 힘이 있어야 하는데 그것을 신적이고 초월적인 빛 곧 성령의 사역으로 규정한다. 본 논문은 코로나 팬데믹 시대를 맞이하여 강해설교가 나아가야 할 방향성을 제시하는데, 그것은 청중들로 하여금 하나님 말씀에 대한 진정한 경험을 회복하도록 하기 위해 그들의 영적인 감각을 깨우는 설교를 해야 한다는것이다. 이를 위해 성령님의 인도함을 받는 설교자의 거룩한 상상력이 얼마나 중요한지, 나아가 성경 본문에 나타난 감정과 정서를 설교에 반영하여 하나님의 마음과 표정을 드러내는 것이 얼마나 필요한지를 주장한다. 청중들을 변화시키는 능력 있는 강력한 설교는 그들의 정신뿐만 아니라 그들의 마음과 정서를 변화시키는 데서 비롯된다. This paper proposed an insight from Jonathan Edwards, who argued that people need a new heart and a new spirit and that in order to have a new “heart of flesh,” an outside force must initiate the change. Edwards defined this outside force as a divine and supernatural light, namely the work of the Holy Spirit. When this light shines on the saints’sense of the heart, which the Holy Spirit gives them in regeneration they can experience God’s beauty. This study has made a series of arguments about a new direction for expository preaching that culminate in its thesis: Jonathan Edwards’s “sense of the heart” as a principle of a new kind of perception or spiritual sensation given by the Spirit of God in regeneration, in which a believer tastes or sees God’s beauty, can provide expository preaching with a meaningful direction for the restoration of religious experience. This paper focused on Edwards’s power of imagination, arguing that imagination can trigger the sense of the heart in the saints’ mind and help them experience spiritual reality. Through the imagination, sanctified by the Holy Spirit, preaching can have great impact on listeners’ hearts. In order for expository preaching to be effective preaching, it must be affective preaching, touching the listeners’ hearts as well as their minds.

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

창조경제와 융합, 스포츠의 휴머니즘적 담론

김지혁(Kim Ji Hyuk) 세계태권도문화학회 2017 세계태권도문화학회지 Vol.8 No.3

Interest in fusion, communication, and consilience has been high across all fields. Steve Jobs was an entrepreneur, co-founder, chairman, and CEO of Apple Inc. His death in October 2011 was mourned by many people around the world. He is praised for merging engineering with humane studies, technology with art, and imagination with reality. Like this, there could be some difference in concept according to each characteristic and expression of fusion, communication, and consilience that reflect the flow of modern society, the meaning is integration rather than division, differentiation, or parts. This is the very reason why this subject of fusion of humane studies with natural science is still valid a year after his death. Physical education is also maintaining the subject of ‘fusion’, ‘communication’, and ‘consilience’ in discussions. This is recognizing the limits to physical education as applied science, and suggesting that fusion of humane studies with natural science is an essential alternative plan. Physical education has a wide range of fields such as History of Sport, Philosophy of Sport, Sociology of Sport, Sport Psychology, Sport Pedagogy, Exercise Physiology, Exercise Nutrition, Sport Biomechanics, Measurement & Evaluation, Sport Management, Sport & Leisure Studies, Leisure & Recreation, Adapted Physical Activity & Exercise, Dance, and Growth & Development. This could be shown as physical education being studied and developed in various directions, but on the other hand, it proves traditional limites of physical education as applied science. That is, humane studies field and natural science field within the structure of physical education are not blending together like an oil slick on the surface of the sea. This is dividing each field to bring about pursued methods and related results. Then, how can physical education obtain peculiar characteristic of science as a combination? Moreover, should natural scientification of humane studies be pursued for fusion of physical education? Or should humanization of natural science be pursued? In short, fusion of physical education would not be an easy assignment. However, it is necessary to overcome this problem for the future of physical education. Therefore, usual aspect of physical education that focused only on the results of the competition, and expand its frame with humanistic thoughts that value human movement itself. This would be the best alternative plan and choice for physical education to become wholesome. The following quote speaks for this argument: “I would trade all of my technology for an afternoon with Socrates” - Steve Jobs, as quoted in Newsweek (29 October 2001), “The Classroom Of The Future”.

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.