판상 유건선과 흡사한 임상소견을 보인 건선

허환,이창우 최신의학사 1986 最新醫學 Vol.29 No.10

정상인에서 안와내 직근의 위치에 대한 연구

허환,박상우,박영걸 대한안과학회 2005 대한안과학회지 Vol.46 No.10

Purpose: In order to propose reference values useful for in diagnosing the strabismus related to the abnormal intraorbital pathway of rectus muscles, we evaluated the intraorbital positions and angles of each rectus muscle in normal subjects. Methods: Using previously scanned orbital MRI and orbital CT of patients who did not show any strabismus or organic disease in the orbit, we calculated the angles of each rectus muscle in the orbit, and compared the results with those of a patient with large angle exotropia. Results: Using orbital MRI and orbital CT, the normal angles of each rectus muscles 10 mm posterior to the globe center were -5.1±3.4 and -1.5±6.0 degrees in the medial rectus, 185.8±8.1 and 180.8±6.9 degrees in the lateral rectus, 98.1±6.03 and 87.9±6.7 degrees in the superior rectus, and -79.7±6.1 and -83.1±11.7 degrees in the inferior rectus, respectively. In the patient with large angle exotropia, each rectus muscle showed orbital pathways similar to the normal patients. Conclusions: We evaluated the normal positions and angles of each rectus muscle in the orbit. The results may be useful in diagnosing the strabismus related to an abnormal orbital pathway of rectus muscles.

천장 영상지도 기반의 전역 위치추정

허환,송재복 한국로봇학회 2014 로봇학회 논문지 Vol.9 No.3

This paper proposes a novel upward-looking camera-based global localization using a ceiling image map. The ceiling images obtained through the SLAM process are integrated into the ceiling image map using a particle filter. Global localization is performed by matching the ceiling image map with the current ceiling image using SURF keypoint correspondences. The robot pose is then estimated by the coordinate transformation from the ceiling image map to the global coordinate system. A series of experiments show that the proposed method is robust in real environments.

단순남성임질 치료에 Kanamycin 및 Probenecid/Fortified Procaine Penicillin G (6 Mu) 병용요법과 Spectinomycin 단독요법의 비교 : Kanamycin plus Probenecid/Fortified Procaine Penicillin G (6 Mu) vs. Spectinomycin

허환,남채식,김영태,김중환 대한화학요법학회 1987 대한화학요법학회지 Vol.5 No.2

From April 1 to October 9, 1985, 289 patients with uncomplicated gonococcal urethritis, seen at the Choong-Ku Public Health Center VD Clinic, were entered into this study. The diagnosis of gonococcal infection and the test of cure were made by the results of culture and Gram staining of urethral smear. The patients were randomly divided into group A and group B, which consisted of 142 and 147, respectively. In group A, kanamycin(KM) 2.0 gm im plus probenecid(BEN) 1.0 gm PO/fortified procaine penicillin G(FPPG) 6 Mu im regimen gave two(1.8%) treatment failures of 110 followed patients. In group B, spectinomycin 2.0 gm im regimen gave one(0.9%) treatment failure of 112 followed patients. The failure rates in both groups were satisfactorily low and not significantly different. The failure rates of PPNG urethritis in group A and in group B were 3.9% and 2.0%, respectively and th difference was not significant. There was no significant difference in the rates of post-gonococcal urethritis between two groups. It is suggested that KM 2.0 gm im plus BEN 1.0 gm PO/FPPG 6 Mu regimen can be used as the first line treatment for uncomplicated gonococcal urethritis in the view of inexpensivenss and efficacy. It is further suggested that in the event KM plus FPPG(6 Mu) regimen will not meet the increasing resistance of Neisseria gonorrhoeae to penicillins, aqueous crystalline penicillin G, 8 Mu more can be substituted for FPPG.

선천 상사근마비의 수직편위각에 따른 하사근 수술의 효과

허환,박상우,박영걸.Hwan Heo. M.D.. Sang Woo Park. M.D.. Yeoung Geol Park. M.D. 대한안과학회 2007 대한안과학회지 Vol.48 No.4

Purpose: To compare the postoperative results of inferior oblique muscle operation in congenital superior oblique palsy (CSOP) according to the preoperative vertical deviation. Methods: This study reviewed medical records of 26 patients who were diagnosed as CSOP with the largest vertical deviation at adducted position and incomitant vertical strabismus from May 2003 to April 2004 at hospital. The patients were divided into two groups, the group 1 (18 patients) shows less than 20 prism diopter (PD) vertical deviation at the primary position, the group 2 (10 patients) shows no less than 20 PD vertical deviation at the primary position preoperatively. We performed operation of the inferior oblique muscle (IOM) for both group. We evaluated the surgical effect at the primary position and both lateral gaze after 3 months. and performed reoperation as needed. Results: Mean correction amount of vertical deviation at primary position of two groups were 11.6±2.7 PD in the group 1 and 7.4±3.5 PD in the group 2. Postoperative vertical deviation was decreased compared to preoperative value and it was statistically significant. But there were statistically significant differences in the corrected amount after inferior oblique muscle operation between two groups at all gazes. Surgical result of group 1 was successful (100%), but in group 2, all failed (100%) and needed reoperation. Conclusions: This study showed that corrected amount with IOM operation was smaller in CSOP with no less than 20 PD vertical deviation at primary position and incomitant vertical strabismus. It may be taken into consideration when operation for rectus and oblique musle were performed simultaneously in CSOP.

일체형과 삼체형 아크릴 인공수정체의 장기 추적관찰 결과의 비교

허환,김황균,윤경철,박영걸,Hwan Heo,Hwang Gyun Kim,Kyung Chul Yoon,Yeoung-Geol Park 대한안과학회 2008 대한안과학회지 Vol.49 No.2

`Purpose: To compare the long-term clinical results of one-piece Acrysof? (SA60AT) hydrophobic acrylic intraocular lens (IOL) implantation compared with implantation of three-piece Acrysof? (MA60BM) hydrophobic acrylic IOL. Methods: We retrospectively analyzed each 50 eyes of 50 patients underwent MA60BM or SA60AT IOL implantation and followed for at least 6 months. Results: Final visual acuity of 0.5 or better was 38 eyes (76%) and 0.8 or better was 20 eyes (40%) in the SA60AT group. In the MA60BM group, it was 41 eyes (82%) and 23 eyes (46%) respectively. There were no significantly differences in predictability, intraocular pressure, endothelial cell density, astigmatism, and incidence of posterior capsule opacification between the two groups. Spherical equivalent at postoperative 1 week was -0.50±0.95D in SA60AT group and was -0.31±0.88D in MA60BM group (P=0.04). However, there was no significant difference between the two groups during follow up period. In MA60BM group, anterior chamber depth (P=0.02) and distance between iris and IOL (P=0.04) reduced significantly during the first postoperative month. Conclusions: Early postoperative axial displacement and changes in spherical equivalent can be occurred in MA60BM group. However there was no difference in long-term clinical results between SA60AT and MA60BM groups. `

분산제어를 위한 모바일로봇 시스템 구축

허환,안효성,홍성제,이남수 제어로봇시스템학회 2009 제어로봇시스템학회 국내학술대회 논문집 Vol.2009 No.9

To greatly expand the use of mobile robot applications, a mobile robot should have the ability to cope with arbitrary environment without previous information. For carrying out some work, the mobile robot should be equipped with functions such as obstacle avoidance and goal approach, local mapping, and pedestrian localization. In this paper, the designed system improves these three function: for obstacle avoidance and goal approach, fuzzy logic is applied on an embedded system, which improves performance according to real time processing; for local mapping, position sensitive device (PSD) and ultrasonic sensor are used and a filtering algorithm of two degrees is proposed; for the pedestrian localization, chirp spread spectrum (CSS)-based indoor localization system is developed and its performance suitable for tracking a pedestrian is revealed through practical experiments.

중소기업 종업원의 학습지향성 인식이 조직시민행동과 혁신행동에 미치는 영향

허환,이유경 대한경영정보학회 2022 경영과 정보연구 Vol.41 No.3

본 연구는 중소기업 종업원의 학습지향성 인식과 조직시민행동 및 혁신행동 간의 관계와 이들 관계에 대 한 학습조직화 참여의 조절효과를 검증하고자 하였다. 연구대상은 포항 지역에 소재한 제조기업 중 고용노 동부․한국산업인력공단에서 지원하는 중소기업 학습조직화 지원사업 참여 기업과 미참여 기업의 종업원을 대상으로 설문조사를 실시하였다. 설문조사는 2022년 4월 1일부터 4월 10일까지 학습조직화 지원사업 참여 및 미참여 기업의 종업원을 대 상으로 각 300부의 설문지를 이메일을 통해 배부하였으며, 체계적·비체계적 오류를 가지는 응답지를 제외하 고 각각 236부와 187부의 데이터를 최종 분석에 사용하였다. 연구가설을 검증하기 위해 SPSS 22.0을 활용 하여 다변량 회귀분석을 시행하고 연구결과를 도출하였다. 가설검증 결과를 살펴보면, 개인학습지향성, CEO학습지향성은 조직시민행동에 정(+)의 영향을 미치지만 조직학습지향성은 조직시민행동에 통계적으로 유의한 영향을 미치지 않는 것으로 나타났다. 다음으로 개인 학습지향성, 조직학습지향성, CEO학습지향성은 모두 혁신행동에 통계적으로 유의한 정(+)의 영향을 미치는 것으로 나타났다. 한편 기업의 학습조직화 사업 참여 여부에 따른 차이를 살펴보면, 학습조직화 사업 참여 기업의 경우 개인학습지향성이 조직시민행동 및 혁신행동에 미치는 영향이 학습조직화 사업 미참여 기업보 다 더 큰 것으로 나타났으며, 학습조직화 사업 미참여 기업의 경우 CEO학습지향성이 조직시민행동과 혁신 행동에 미치는 영향이 학습조직화 사업 참여 기업보다 큰 것으로 나타났다. 실증분석 결과를 토대로 중소기 업 종업원들의 조직시민행동 및 혁신행동의 영향요인으로서 학습지향성 및 학습조직화 활동의 학술적·실무 적 함의에 대해 논의하였다.

안구건조증 환자에서 국소 테스토스테론 젤의 치료효과

허환,강인성,오미화,윤경철.Hwan Heo. M.D.. In Sung Kang. M.D.. Mei Hwa Wu. M.D.. Kyung Chul Yoon. M.D. 대한안과학회 2006 대한안과학회지 Vol.47 No.8

Purpose: To evaluate the therapeutic effect of topical testosterone gel application to periocular area in dry eye. Methods: Thirty-four eyes of 17 patients with refractory dry eye were included. Five patients had Sjogren`s syndrome and 12 were non-Sjogren`s syndrome patients. Testosterone gel was applied on the periocular area three times a day. Symptom score corneal sensitivity test (CST), tear film break-up time (BUT), basal tear secretion test (BST), fluorescein staining, tear clearance test (TCR), and conjunctival impression cytology were checked and evaluated before, one month after and two months after treatment. Results: The mean symptom score before topical testosterone gel application was 3.44±0.70; it was 2.88±0.84 at 1 month after application and 2.03±1.09 at 2 months after application. The improvement of tear film parameters including BUT, tear clearance rate, fluorescein staining score, conjunctival metaplasia and goblet cell density was statistically significant (P<0.05) at one and two months after treatment but neither BST nor CST was improved with statistically significance. There was no difference in the therapeutic effect of topical testosterone gel between Sjogren`s syndrome and non-Sjogren`s dry eye patients. Conclusions: The function of tear film and the integrity of ocular surface improved after topical application of testosterone gel in dry eye patients. Topical testosterone gel application may be an effective adjuvant therapy for the treatment of dry eye.

제49차 추계학술대회 : 일반 포스터 ; 신체 부위별 HSV 감염 환자에서 nested PCR을 이용한 HSV-1과 HSV-2의 동정

허환,김영태 대한피부과학회 1997 초록집 Vol.35 No.20