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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.
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
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)
급성 및 만성 두드러기 환자에서 MAST 화학발광법 양성율과 알레르기 항원 검출율에 대한 비교 연구
정희철 ( Hee Chul Chung ),안성구 ( Sung Ku Ahn ) 대한피부과학회 2015 大韓皮膚科學會誌 Vol.53 No.5
Background: The multiple allergosorbent test chemiluminescent assay (MAST-CLA) is a simple system with high sensitivity and specificity for measuring total and allergen-specific IgE antibodies in patients with allergic skin diseases such as urticaria. Objective: The purpose of this study was to evaluate total IgE class, allergen frequencies, and their correlations in MAST-CLA in acute and chronic urticaria. Methods: We performed a retrospective study using medical documents of 2,028 urticaria patients (average age= 34.85 years) who visited Yonsei Wonju Severance Christian Hospital, Yeongseo Province, Korea, between 2003 and 2012. Positive rates of specific IgE and total serum IgE levels in acute and chronic urticaria patients were analyzed. Results: Among the total 2,028 patients, 1,263 (62.3%) had acute urticaria, and 765 (37.7%) had chronic urticaria. The number of patients with higher than class 2 level of serum total IgE was 1,496 (73.8%): 964 (76.3%) of the acute urticaria group and 532 (69.5%) of the chronic urticaria group. More than half of the patients (1,048; 51.7%) showed a positive reaction to at least one allergen-specific IgE. The positive rate of acute urticaria was 53.0% and chronic urticaria 49.5%. In both acute and chronic urticaria, the most commonly detected allergen was Dermatophagoides farinae, followed by D. pterony and house dust. Most patients showed lower positive reactions to food allergens. Peach was the most common food allergen in both groups. Of the patients who showed positive total IgE, 40.4% did not react to any allergen-specific IgE. Also, 26.3% of the patients who were negative for total IgE showed a positive reaction to more than one allergen-specific IgE. The level of total IgE and the number of positive allergen-specific IgE responses were positively correlated in both acute and chronic urticaria patients. Conclusion: Our results showed that the positive rate of total IgE was higher in acute urticaria patients than in chronic urticaria patients. Both acute and chronic urticaria patient groups showed the highest positive rates for D. farinae. Positive rates for response to food allergens, such as soybean, chicken, yeast, tuna, and salmon, were lower in the chronic urticaria group. For inhalant allergens, the positive rates of response to white oak and Aspergillus were higher in the acute urticaria group. The level of total IgE and the number of positive allergen-specific IgE responses showed a positive correlation in both groups. Thus, MAST-CLA appears to be a simple and convenient method for determining causative allergens in the occurrence and exacerbation of urticaria, but other studies are necessary to confirm these preliminary findings. (Korean J Dermatol 2015;53(5):374∼380)
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.
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)
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