분만 젖소의 자궁내 povidone-iodine 용액의 주입이 번식효율에 미치는 영향

유인천,김일화 한국임상수의학회 2007 한국임상수의학회지 Vol.24 No.3

This study determined the effect of postpartum intrauterine infusion of povidone-iodine solution on thesubsequent reproductive performance in dairy cows. Six hundred and fifty-eight dairy cows that were around week4 postpartum were randomly divided into two groups: (1) Cows in treated group received an intrauterine infusionserved as the controls (control group, n = 389). The cows were bred at observed estrus more than 50 days after calving.Artificial insemination (AI) was done according to the a.m.-p.m. rule. The conception to AI was determined per rectum60 days after AI by both ultrasonographical observation and manual palpation. The intervals from calving to first serviceand conception (94.2. 2.7 and 144.1. 4.1 days vs. 88.0. 2.1 and 143.5. 4.6 days, respectively), number of servicesper conception (2.0. 0.1 vs. 2.1. 0.1), and cumulative pregnancy rates within 90 and 150 days postpartum (31.9 and61.7% vs. 29.7 and 62.1%) did not differ between the control and treated groups (P. 0.05), while conception rateat first service was lower (P. 0.05) in the treated group (40.5%) than in the control group (49.4%). Aditionally,we could not find any effect of intrauterine infusion of povidone-iodine solution according to cow parity or calvingat week 4 postpartum does not affect the subsequent reproductive performance in dairy cows.

알터나리아 각막염의 임상양상과 예후

유인천,강인성,윤경철,In Cheon You,M,D,In Seong Kang,M,D,Kyung Chul Yoon,M,D,Ph,D 대한안과학회 2007 대한안과학회지 Vol.48 No.4

Purpose: To investigate the risk factor, clinical manifestations, treatment results, and prognosis in Alternaria keratitis. Methods: Thirteen eyes of 13 patients who were diagnosed as Alternaria species by corneal smear and culture were included. The past history, visual acuity, location and size of ulceration, hypopyon, treatment results, and prognosis were analyzed retrospectively. Results: Nine (69.2%) were women, and 4 were men. The mean age was 65.23±8.70 years. Eleven eyes (84.6%) had previous history of corneal traumas by soil or plant material. In 7 eyes (53.8%), the lesions were located at the corneal center. The average size of ulceration was 13.90±21.80 mm2. Four eyes (30.8%) had hypopyon. The initial visual acuity was less than 0.1 in 10 eyes (76.9%). The final visual acuity improved more than 2 lines in 10 eyes (76.9%) and more than 1 line in 12 eyes (92.3%), and did not change in 1 eye (7.7%). The treatment success was achieved in 12 eyes (92.3%). Conclusions: Early diagnosis and specific antifungal treatments of Alternaria keratitis can lead to a good prognosis.

스테노트로포모나스 말토필리아 각막염의 임상양상과 예후

유인천,이승현,박영걸,윤경철,In Cheon You,M,D,Seung Hyun Lee,M,D,Yeoung Geol Park,M,D,Ph,D,Kyung Chul Yoon,M,D,Ph,D 대한안과학회 2007 대한안과학회지 Vol.48 No.7

Purpose: To investigate the risk factor, clinical manifestations, treatment results, and prognoses in Stenotrophomonas maltophilia keratitis. Methods: Ten eyes of 10 patients who were diagnosed with, Stenotrophomonas maltophilia by corneal smear and culture were included in this study. Each patient`s past history, visual acuity, location and size of ulceration, hypopyon, treatment results and prognosis were analyzed retrospectively. Results: Seven pateints (70.0%) were men, and 3 were women. The mean age was 62.9±11.3 years. Only 2 eyes (20.0%) had previous histories of corneal traumas. Polymicrobial infections, including 3 cases infected with Pseudomonas species and 2 cases infected with Fusarium species, were detected in 7 eyes (70.0%). The lesions were located at the corneal center in 6 eyes, and hypopyon was observed in 9 eyes. The average size of ulceration was 28.5±19.6 mm2. Seven eyes (70.0%) underwent surgical treatment. The initial visual acuity was less than 0.02 in 9 eyes (90.0%). The final visual acuity improved in 3 eyes (30.0%) and was less than hand movement in 7 eyes (70.0%). Conclusions: Stenotrophomonas maltophilia keratitis occurs in patients with a compromised ocular surface, is often polymicrobial, and is associated with poor prognoses.

결막과 비점막에 다발성 작은결절로 발현된 사르코이드증 1예

유인천,문형진,문귀형,임상철,윤경철 대한안과학회 2008 대한안과학회지 Vol.49 No.6

Purpose: Sarcoidosis is a noncaseating granulomatous disorder that can affect any organ. In its early phase, sarcoidosis is clinically similar to tuberculosis. We report a case of sarcoidosis diagnosed through ocular and systemic evaluations in a patient who developed multiple conjunctival nodules during antituberculous treatment for nasal mucosal nodules. Case summary: A 37-year-old woman who had been on antituberculosis medications for 9 months because of multiple nasal mucosal nodules was referred for conjunctival hyperemia and the multiple nodules. The ocular examination revealed multiple conjunctival nodules in the upper and lower fornices. Biopsy and systemic evaluations were performed. A conjunctival biopsy specimen showed noncaseating granulomatous inflammation compatible with sarcoidosis. Laboratory tests revealed hypercalciuria and increased levels of ACE. Chest computed tomography showed bilateral hilar and mediastinal lymphadenopathy. Subconjunctival steroid injection was done for the conjunctival nodules and systemic steroid treatment was started as well. Complete resolution of conjunctival lesions was obtained. Conclusions: In cases of chronic, multiple conjunctival and nasal mucosal nodules, sarcoidosis should be considered in the differential diagnosis. J Korean Ophthalmol Soc 49(6):1000-1006, 2008

간헐외사시 수술 후 10PD 이상 과교정된 내사시의 임상적 고찰

유인천 ( Yu In Cheon ),윤경철 ( Kyung Chul Yoon ),박영걸 ( Park Yeong Geol ) 대한안과학회 2003 대한안과학회지 Vol.44 No.10

배양 양성 감염각막염의 임상양상 및 항생제감수성 변화: 10년간의 국내 다기관 연구

유인천(In-Cheon You),이상범(Sang-Bumm Lee),서경률(Kyoung Yul Seo),김미금(Mee Kum Kim),윤경철(Kyung-Chul Yoon),고재웅(Jae Wong Koh),이지은(Ji Eun Lee),김성재(Seong-Jae Kim),KOAIDS 대한안과학회 2021 대한안과학회지 Vol.62 No.4

목적: 최근 10년간 감염각막염 중 배양검사상 균주가 확인된 환자에 대하여 여러 임상양상에 대해 알아보고자 한다. 대상과 방법: 2008년 1월부터 2017년 12월까지 전국 8개 병원에서 균주가 확인된 감염각막염 956명의 의무기록을 후향적으로 분석하여, 선행요인, 원인균, 치료 방법, 예후 등을 분석하였다. 결과: 감염각막염의 가장 흔한 선행요인은 안외상(33.2%)이었다. 초기시력은 안전수지 이하가 449안(47.0%)이었다. 각막궤양은 중심부에서 흔하였고, 크기는 4 mm² 이하가 가장 많았다. 전방축농이 동반된 경우는 295안(30.9%)이었다. 배양된 균주는 총 1,039균으로 그람음성균 443균주(42.6%)가 가장 많았다. 가장 흔한 균은 그람음성균은 녹농균, 그람양성균은 피부포도알균, 진균은 푸사륨이었다. 수술 치료는 201안(21.0%)에서 양막이식술 66안, 안구내용제거술 44안 순이었다. 최종시력은 0.2보다 좋은 시력이 422안(44.1%)이었다. 그람양성균은 목시플록사신과 반코마이신에, 그람음성균은 레보플록사신과 세프타지딤에 높은 감수성을 보였지만 일부 장알균과 슈도모나스 등에서 저항성을 보였다. 결론: 국내 감염각막염은 안외상으로 흔히 발생하였고 그람음성균이 가장 많았다. 대표적인 원인균은 피부포도알균, 녹농균, 푸사륨이었다. 입원 후 약물 및 수술적 치료로 시력이 호전된 경우가 많았지만 일부 저항성을 보이는 세균과 진균에 대해서는 주의가 필요하다. 세균에서 불량한 임상결과에 이르는 위험인자는 초기시력 0.02 미만, 전방축농, 65세 이상 나이, 각막중심부 궤양이었고 진균은 70세 이상 나이였다. Purpose: To analyze the clinical manifestations of culture-proven infective keratitis patients over a recent 10-year period. Methods: We retrospectively reviewed the medical records of 956 cases of infective keratitis between January 2008 and December 2017 at eight tertiary hospitals. The study was performed to analyze the risk factors, causative microbial organisms, therapeutic outcomes, and prognosis. Results: The most common risk factor of keratitis was trauma (33.2%). Initial visual acuity (V/A) was finger count or less in 449 eyes (47.0%). The common location of keratitis was central, and the size was 4 mm2 or less. Hypopyon was observed in 295 eyes (30.9%). Of the 1,039 cultured isolates, 443 (42.6%) grew Gram-negative bacteria with the most common being Pseudomonas aeruginosa. The most prevalent Gram-positive bacteria was Staphylococcus epidermidis, and fungi was Fusarium species. Surgical treatments were performed in 201 eyes (21.0%), followed by amniotic membrane transplantation (66 eyes) and evisceration (44 eyes). Final V/A was 20/100 or more in 422 eyes (44.1%). Gram-positive organisms were highly susceptible to moxifloxacin and vancomycin, and Gram-negative organisms were highly susceptible to levofloxacin and ceftazidime. An increase in resistance to these antibiotics was detected for Enterococcus and Pseudomonas. Conclusions: In South Korea, infective keratitis occurs frequently in eyes with trauma. Staphylococcus epidermidis, Pseudomonas aeruginosa, and Fusarium species are commonly identified etiologies of microbial keratitis. The appropriate administered medical and surgical treatments of suspected infectious keratitis can lead to visual improvement with particular care taken to minimize infection related to resistant bacteria and fungal microbes as needed. An initial V/A of 0.02 or less, the presence of hypopyon, age of 65 years or more, and a central lesion were associated with poor clinical outcome of bacterial keratitis. Age of 70 years or more was a significant risk factor for poor clinical outcome of fungal keratitis.

안와단층촬영을 이용한 누액배출계의 해부학적 연구

유인천 ( In Chon You ),정상기 ( Sang Ki Jeong ),서정진 ( Jeong Jin Seo ) 대한안과학회 2002 대한안과학회지 Vol.43 No.11

심한 경성삼출을 동반한 당뇨 황반부종에 있어 내경계막의 제거

유인천 ( In Cheon Yu ),송승 ( Seung Song ),서만성 ( Man Seong Seo ) 대한안과학회 2002 대한안과학회지 Vol.43 No.11

네트워크 환경 및 데이터 요구사항에 따른 무인기 네트워크 자원할당 알고리즘

천혜림(Hye-Rim Cheon),황찬호(Chan-Ho Hwang),이우신(Woosin Lee),유인덕(Indeok Yoo),김재현(Jae-Hyun Kim) 대한전자공학회 2017 전자공학회논문지 Vol.54 No.7

무인기 시스템은 무인기 시장이 확대됨에 따라 다수 무인기의 동시 운용을 위한 충분한 주파수 대역 할당에 한계가 있다. 또한, 무인기의 이동성으로 인해 실시간으로 무인기 네트워크 통신환경이 급변한다. 따라서 무인기 시스템의 안정적인 운용 및 전송 data rate를 최대로 하기 위해서는 한정된 주파수 대역폭 안에서 주어진 네트워크 환경을 고려한 효율적인 자원할당이 필요하다. 본 논문에서는 TDMA(Time Division Multiple Access)를 기반으로 주어진 네트워크 환경에서 무인기 운용을 위한 최소 데이터 요구사항을 만족시키는 동시에 네트워크 처리율을 최대로 하는 자원할당 알고리즘을 제안한다. 성능분석을 통해 제안한 알고리즘은 주어진 네트워크 환경에서 최소 데이터 요구사항을 만족하면서 높은 네트워크 처리율을 만족시키는 자원할당이 가능함을 입증하였다. UAV system has the limitation to allocate enough spectrum bandwidth for the operation of multiple UAVs due to the market expansion. In addition, the communication environment of UAV network varies dynamically due to the UAV’s mobility. Thus, to operate the stable UAV system and maximize the transmission data rate, it needs to allocate the resource effectively in the limited bandwidth considering the given network environment. In this paper, we propose the resource allocation algorithm which can maximize the network throughput as well as satisfy the minimum data requirement for the UAV system operation in the given network environment based on TDMA(Time Division Multiple Access). By performance analysis, we show that the proposed algorithm can allocate the resource to satisfy the high network throughput as well as the minimum data requirement in the given network environment.

Nontuberculous Mycobacterial Infection after Removal of the Exposed Hydroxyapatite

송용연,유인천,안민 대한안과학회 2017 Korean Journal of Ophthalmology Vol.31 No.4