위성 DMB 중계기용 Cavity-Backed슬롯 배열 안테나

정희철,이학용,정병운,강기조,박면주,이병제,Jung Hee-Chul,Lee Hak-Yong,Jung Byungwoon,Kang Gi-Cho,Park Myun-Joo,Lee Byungje 한국전자파학회 2005 한국전자파학회논문지 Vol.16 No.4

This paper presents analysis of a slot array antenna having a low side lobe level and high front-to-back ratio for a repeater system of a satellite DMB(Digital Multimedia Broadcasting) service. Antennas for this repeater system require a high gain and enough isolation to reduce interferences between signals in system. Therefore, it is necessary to suppress a side lobe level and to increase front-to-back ratio. Unlike a structure 134 by lossy microstrip lines, in this work a single cavity-backed slot antenna array using a single waveguide feed is proposed to obtain the reliability for high power handling and high radiation efficiency. The side lobe level and front-to-back ratio are enhanced with tapered array technique and an optimized vertical reflector. The measured side lobe levels in H- and E-plane are under $-33.24\;\cal{dB}$ and $-35.78\;\cal{dB}$, respectively. The front-to-back ratio over $37.84\;\cal{dB}$, and the peak gain of over $17\;\cal{dBi}$ are measured.

위장관 간질종양으로 오인된 대장 중복낭 1예

정희철 ( Hee Chul Jung ),정석원 ( Seok Won Jung ),정인두 ( In Du Jeong ),방성조 ( Sung Jo Bang ),신정우 ( Jung Woo Shin ),박능화 ( Neung Hwa Park ),김영민 ( Young Min Kim ),최대화 ( Dae Hwa Choi ),김도하 ( Do Ha Kim ) 대한장연구학회 2009 Intestinal Research Vol.7 No.1

Duplications of the gastrointestinal tract are rare congenital malformations that are usually present during the first decade of life. However, a smaller number of cases may remain occult until adulthood. Overall, the colon is the least common site of congenital gastrointestinal duplications. Colonic duplications can present with symptoms of diverticulitis and can be confused with acquired giant cysts or masses. We present a rare case of a duplication cyst of the colon in a female adult. Although the preoperative evaluations, including an abdominal CT scan and colonoscopy, were suggestive of a gastrointestinal tumor of the colon, the final diagnosis was a colonic duplication cyst based on the histopathologic examination of the resected specimen. Even if intestinal duplication cysts are uncommon, they should be considered in the differential diagnosis of intestinal masses. (Intest Res 2009;7:64-67)

포스터 전시 : 위장관 ; 장중첩증으로 발견된 소장 임파종 1예

정희철 ( Hee Chul Jung ),김남일 ( Nam Il Kim ),김성자 ( Sung Ja Kim ),이구 ( Goo Lee ),양창헌 ( Chang Heon Yang ),이창우 ( Chang Woo Lee ),정기훈 ( Gee Hoon Jung ),김정란 ( Jung Ran Kim ),서정일 ( Jeung Ill Suh ) 대한소화기학회 2002 대한소화기학회 춘계학술대회 Vol.2002 No.-

<증례> 33세 남자가 내원 1개월 전부터 간헐적인 상복부와 제대주위 통증이 있어 타병원에서 두 차례 상부위장관내시경검사를 시행하여 위염 진단 하에 치료 하던 중 증상호전이 없어 내원하였다. 내원당시 체중감소는 없었으며 이학적소견상 상복부와 제대주위에 경도의 압통이 있었지만 반발통은 없었고 덩어리나 임파선은 촉지되지 않았다. 검사실소견상 백혈구 8,460/㎣, 헤모글로빈 14.9g/㎗, 혈소판 281,000/㎣이였으며 말초혈액도말검사, 간기능검사, 혈청

Vibrio parahemolyticus 식중독에 관한 임상적 고찰

송정상 ( Jung Sang Song ),양문호 ( Moon Ho Yang ),이창홍 ( Chang Hong Lee ),김영설 ( Young Seol Kim ),정희철 ( Hee Chul Chung ),정우진 ( Woo Jin Chung ),지현숙 ( Hyun Sook Chi ) 대한내과학회 1978 대한내과학회지 Vol.21 No.5

지역적, 전역적 특징을 이용한 환경 인식

강산들,황중원,정희철,한동윤,심성대,김준모,Kang, San-Deul,Hwang, Joong-Won,Jung, Hee-Chul,Han, Dong-Yoon,Sim, Sung-Dae,Kim, Jun-Mo 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.3

In this paper, we propose an integrated algorithm for scene recognition, which has been a challenging computer vision problem, with application to mobile robot localization. The proposed scene recognition method utilizes SIFT and visual words as local-level features and GIST as a global-level feature. As local-level and global-level features complement each other, it results in improved performance for scene recognition. This improved algorithm is of low computational complexity and robust to image distortions.

Synthesis of the New Saccharin Derivatives Containing 2,4,5-Imidazolidinetrione Group

정대일(Dai Il Jung),김용환(Young Hwan Kim),정희철(Hee Chul Jung),김윤영(Yun Young Kim),김인식(In Shik Kim),박유미(You Mi Park),최순규(Soon Kyu Choi) 대한화학회 1999 대한화학회지 Vol.43 No.4

Fusobacterium nucleatum 에 의한 간농양 1 예

정소연(So Yean Jung),정희철(Hee Chul Jung),이창화(Chang Hwa Lee),김남일(Nam Il Kim),김성자(Sung Ja Kim),이구(Goo Lee),서정일(Jeong Il Suh),이창우(Chang Woo Lee),하경임(Gyoung Yim Ha),김한식(Han Sik Kim),양창헌(Chang Heon Yang) 대한소화기학회 2002 대한소화기학회지 Vol.39 No.5

Fusobacterium is a very rare cause of liver abscess. Fusobacteria are anaerobic gram- negative bacilli that are part of normal flora of the oral cavity, the urogenital tract, and the gastrointestinal tract. However, Fusobacterium bacteremia is uncommon, accounting for less than 1% of all bacteremias in adults. Liver abscess due to Fusobacterium nucleatum (F. nucleatum) was reported in patients with AIDS or idiopathic CD4+T lymphocytopenia. We experienced a 54-year-old woman who presented with intermittent fever and generalized weakness for 2 months. Abdominal CT scan revealed an 8 × 10 cm mass in the right hepatic lobe with central low density. Ultrasound-guided aspiration of liver abscess was performed. About 30 mL of greenish-yellow foul-odored pus was aspirated. F. nucleatum was cultured from the aspirated pus. Intravenous administration of antibiotics for 4 weeks and repeated aspiration improved symptoms and decreased size of liver abscess. We report a case of liver abscess due to F. nucleatum in an immunocompetent woman. ( Korean J Gastroenterol 2002; 39: 386-389)

제한 시간을 갖는 작업 환경에서 강화학습 기반 드론의 자율비행 비교 연구

권은주(Kwon Eun Ju),정희철(Jung Hee Chul),김현석(Hyunseok Kim) 한국통신학회 2024 한국통신학회 학술대회논문집 Vol.2024 No.1

포스터 전시 : 간 ; Fusobacterium nucleatum에 의한 간농양 1예

정소연 ( So Yean Jung ),정희철 ( Hee Chul Jung ),이창화 ( Chang Hwaa Lee ),천우정 ( Woo Jung Chun ),김남일 ( Nam Il Kim ),김성자 ( Sung Ja Kim ),이구 ( Goo Lee ),서정일 ( Jeung Ill Suh ),이창우 ( Chang Woo Lee ),하경임 ( Gyoung Y 대한소화기학회 2002 대한소화기학회 춘계학술대회 Vol.2002 No.-

<증례> 45세 여자가 2개월 전부터 발생한 간헐적인 발열 및 전신 쇠약감을 주소로 내원하였다. 환자는 2개월 전부터 발열 및 오한이 있어 개인 의원에서 상기도 감염 진단하에 약물치료를 받았으나 내원 전날까지 증상의 호전과 악화가 반복되어 내원하였다. 과거력상 2년전 고혈압을 진단 받고 치료중인 것 외에는 특이 사항이 없었다. 이학적 검사상 전신 상태는 양호하였고 복부 촉진에서 압통이 있는 부위는 없었으며 간이나 비장의 종괴는 만져지지 않았다. 검사실

정책연구 : 중소기업 경쟁력 강화를 위한 정책 개선 연규: 일본,미국,EU 및 주요가맹국 비교연구를 통한 제언

이윤보 ( Yoon Bo Lee ),백훈 ( Hoon Baek ),정희철 ( Hee Chul Jung ) 한국중소기업학회 2010 中小企業硏究 Vol.32 No.4

우리나라 중소기업은 국가경제적 비중이 높고, 경제·사회적으로 중요한 역할을 담당하고 있다 이는 비단 우리나라 뿐 아니라 선진국도 유사하며, 대부분의 국가에서 기술혁신의 주체, `고용없는 성장` 시대의 일자리 창출자, 국민경제 및 지역사회 발전에 대한 기여자로서 중소기업의 역할과 중요성이 강조되고 있다. 이에 선진국에서는 보다 실효성 있는 중소기업지원을 위해 각국의 경제 상황에 맞는 관련법·제도 및 정책을 구축하여 혁신적이고, 활력 있는 중소기업 창출 및 발굴을 통해 국가경쟁력 강화 및 지속적인 성장을 위한 국가차원에서의 노력을 경주하고 있다. 또한 선진국들의 중소기업에 대한 공통된 정책 변화를 보면, 과거 대기업과 중소기업 간의 불공정 시정 및 시장경제논리의 적용 동 국가별 상이한 정책운영이 이루어 졌으나, 최근에 들어서 모두 경제정책의 중심에 중소기업정책을 둠으로써 중소기업의 중요성을 더욱 부각시키고 있는 것이다. 따라서 본 연구에서는 일본·미국 `EU 및 주요가맹국들의 중소기업정책 동향을 비교하여, 경제환경 변화에 적극적으로 대응할 수 있는 바람직한 우리 중소기업정책의 개선 방향을 제시하고자 하였다. Small and Medium Enterprises (hereafter called "SMEs") in Korea occupy a high ratio in the national economy and play an important role economically and socially. This is not something that applies to our country only, but it is similar to developed counties. SMEs play an important role in industrial production in particular, and economic growth in general in less developed, developing, and transitional economies worldwide. They have generally provided the bulk of en-trepreneurs and employment in these economies, and the necessary foundations for sustained economic growth and rising incomes. So in most counties, the role and importance of SMEs as contributors to the national econo-my and community development, main agents of technical innovation, and job creators in the era of so-called jobless growth is being emphasized. Also policies have been generated across economies to further develop and strengthen the SME sector in developed counties. The SME policies and programs are in many quarters and vary according to country ex-periences and necessity, and generally address improvement of exports, market development, furthering the use of skill and credit access. Thus, this study is intended to present the desirable SME policy directions that could positively cope with the economic environment change by comparing the SME policy trends of developed countries. Looking at the common change in the SME policy in surveyed countries, different policy operations had been formed in the past such as unfair business connections between large and SMEs, application of market economy, etc. However, in recent years, these countries are magnifying the importance of SMEs, by positioning the SME policy at the heart of economy policies. According to the change in the policy of SME in developed counties such as Japan, the amendment of 「SME Basic Law」 in 1999, by diverting the SME policy ideas, goals and means, reestablished the direction and ideal conception from the past`s `protection and promotion` to present`s `promotion and competition` and adopted `Promotion of SMEs` as an alternative to overcome the prolonged economic recession. In case of the US, based on the open competition private enterprise, open competition and guarantee of equitable economy were assured. Through the 「SME Agenda」, the President announced that SMEs are the heart of the US economy and encouraged federal offices to improve the conditions of growth and foundation of the SME by relieving the tax burden and ameliorating business conditions. ED and main member countries also recognized the importance of SMEs by announcing `Lisbon Agenda` in 2000, enacted the 「Small Business Act for Europe」 by targeting the continued growth and competitiveness of SME under the principle of `Think. Small First` in 2008, and created the vision of "Let`s make the highest environmental class for SMEs all over the world." As seen above, developed countries have recently emphasized the role of SMEs and tried to establish 5MB policy to cope with the change in the economic environment. These change provide policy implications to the SME policies of Korea with which are as follows: First, the 5MB is the heart of overcoming of the global economic crisis. In the case of U.S., since the launch of the Obama administration, they have been endeavoring to overcome the ongoing financial crisis and are looking for core solutions in SMEs to overcome the crisis. Second, for rationalization of the policy scope that is targeted at SMEs, the capital of SMEs that has rela-tively wide range of policies need to be narrowed so that appropriate size enterprises can foster themselves. Also Small and Micro Enterprises should have policies to secure the social safety-net by expanding the num-ber of the employment. Through these means, foster SMEs as an independent agents on one hand, and im-prove government finance and fairness of the policy through promoting Small and Micro Enterprises on the other hand. Third, the role of SMEs is the source of competitive reinforcement for relieving chronic unemployment and social integration. The EU is making an effort to improve the environment for the competitiveness and vigo-rous business activity by overcoming the continuous unemployment and social integration of the EU system. Fourth, SMEs play a major role in the local economy and in establishment of new businesses. In France, the role of SMEs is expanding as the core subject of the promotion of the country`s territory maintenance and local traditional industries. In addition, the UK recognizes SMEs as the driving force of starting new businesses, and Germany recognizes them as the subject of innovation and is making effort to support the policy according to their needs. As mentioned above, all the surveyed countries endeavor to use SMEs as key solutions to the social and economic problems. Therefore, it is time for our country to realize SMEs competitive strength through redefining the ideology, scope, principle agent, measure, etc. of the SMB policies reflecting in global change. To realize this, first a redefining of policy ideology of the SMB is required. The ideology of policy should be switched from `Protection and Promotion` oriented in the past to `Promotion and Competition` oriented which can adapt by themselves to the changing circumstances. Second, for rationalization of the policy scope that is targeted at SMEs, the capital of SMEs that has rela-tively wide range of policies need to be narrowed so that appropriate size enterprises can foster themselves. Also Small and Micro Enterprises should have policies to secure the social safety-net by expanding the num-ber of the employment. Through these means, foster SMEs as an independent agents on one hand, and im-prove government finance and fairness of the policy through promoting Small and Micro Enterprises on the other hand. Third, strengthening of government organization and policy operation is required at an appropriate level to the SMEs status. This mean, the establishment of a policy system based on SMEs viewpoint is required that is appropriate with the social and economic status of SMEs and the strengthening of the small business administration status is required to overcome policy operation limits as a vice-minister class organization. Fourth, selection and concentration must be firmed through change in policy measures for positive re-sponsiveness to economic environmental change. Through expansion of government finance and strengthening the soft support for SMEs to adapt to the economic environment change, SMEs make sure the competitive-ness and viability by themselves. This kind of support policy is prevalent to encourage the growth and devel- opment of SMEs around the world. We need to improve each of SMB policy and enhance research and investigation, etc., as well as above mentioned. Best of all, policy-makers and SMEs involved, all of the people should be required to the mind of love and recognition of the importance for SMEs in order to realize the SMB-oriented economic policy. And such efforts, if we keep it, is a way to guarantee continued growth and we will have a driving force national economy growth.