감각사시의 편위 방향과 관련된 임상적 특징들

박병건,김정림,이슬기,Byung Gun Park,Jung Lim Kim,Sul Gee Lee 대한안과학회 2012 대한안과학회지 Vol.53 No.8

Purpose: To assess the clinical features associated with the direction of deviation in sensory strabismus and postoperative stability of strabismus angles. Methods: The authors retrospectively reviewed the medical records of 98 patients diagnosed with sensory strabismus who were treated surgically. Among the factors analyzed were sex, age, direction of strabismus, preoperative visual acuity, age at onset of visual loss, cause of primary sensory deficit, refractive error, age at operation, deviation angle at 1 and 6 months postoperatively and after at least 5 years. Results: At baseline, 20 patients (20.4%) had esotropia and 78 (79.6%) had exotropia. Common causes of primary sensory deficit were corneal opacity (25.5%), vitreoretinal disorder (23.5%), and congenital cataracts (16.3%). The proportion of esotropia increased significantly as the refractive error of the sound eye became more hyperopic. The older the patients were when they lost their vision, the higher the proportion of exotropia. Patients with longer duration of vision loss were more likely to have a larger deviation angle with exotropia, but the association was not significant with esotropia. Conclusions: Patients with sensory strabismus tend to develop exotropia. Refractive error of the sound eye and age at onset of vision loss were associated with the direction of strabismus. Despite poor sensory fusion even after surgery, more than 50% of patients maintained a stable eye position. J Korean Ophthalmol Soc 2012;53(8):1138-1142

일차성 기흉의 비디오 흉강경 수술 후 발생한 의인성 호르너 증후군 1예

박병건,최재원,한일용,양재욱,Byung Gun Park,Jae Won Choi,Il Yong Han,Jae Wook Yang 대한안과학회 2012 대한안과학회지 Vol.53 No.1

Purpose: To report a case of iatrogenic Horner’s syndrome after video-thoracoscopic surgery for primary pneumothorax. Case summary: An 18-year-old man with ptosis in the right eye was referred to our clinic. The patient had undergone wedge resection via video-thoracoscopic surgery for primary pneumothorax three weeks previously. On ocular examination, the palpebral fissure width was 7 mm in the right lid and 8 mm in the left lid, the marginal reflex distance 1 (MRD 1) was 2 mm in the right lid and 3 mm in the left lid, and the bilateral levator muscle function was good. Anisocoria was present, and pupil size in a dark room was 2.5 mm in the right eye and 4 mm in the left eye. The patient complained of facial anhidrosis on the right side of the face. Conclusions: Although iatrogenic Horner’s syndrome is rare complication of video-thoracoscopic surgery for primary pneumothorax, diagnosis after surgery of the thoracic cavity should be made carefully. J Korean Ophthalmol Soc 2012;53(1):157-160

제한적 시스템을 위한 강인한 일단계 이동구간 제어

박병건(Byung-Gun Park),권욱현(Wook Hyun Kwon),이재원(Jae-Won Lee) 대한전기학회 1998 대한전기학회 학술대회 논문집 Vol.1998 No.11

Ca와 Mg 함량비에 따른 Calcium Magnesium Acetate 제설제의 융빙 특성

정경환 ( Kyong-hwan Chung ),박병건 ( Byung-gun Park ),이기완 ( Ki-wan Lee ),고태석 ( Tae-seog Koh ) 한국환경기술학회 2015 한국환경기술학회지 Vol.16 No.4

친환경 제설제로 주목을 받고 있는 칼슘마그네슘 아세테이트(Calcium Magnesium Acetate: CMA)와 수산화 칼슘 첨가제를 함유시켜 제조한 CMA의 융빙 특성에 대하여 조사하였다. CMA는 수산화칼슘과 수산화 마그네슘의 함량 비를 다르게 하여 제조하였다. 또한 염화나트륨과 염화칼슘과 비교하여 CMA 부식률을 산출하였다. 같은 몰비로의 수산화 칼슘과 수산화 마그네슘으로 합성한 CMA(5:5)는 -5℃와 -12℃에서 가장 많은 융빙량을 보였다. CMA 제조 과정에서 수산화칼륨을 첨가하면 융빙량이 크게 늘어났다. 염화칼슘과 염화나트륨 제설제는 심한 강제 부식을 보인 반면 CMA 제설제와 수산화칼륨이 첨가된 CMA는 철강재를 거의 부식시키지 않았다. The deicing properties of the calcium magnesium acetate (CMA) known as an eco-friendly deicer and added with KOH were studied. The CMAs were prepared with different molar ratio of calcium hydroxide and magnesium hydroxide. The corrosion rate was also evaluated to the CMAs compared with those of sodium chloride and calcium chloride deicers. The CMA(5:5) composed with the same molar ratio of calcium hydroxide and magnesium hydroxide exhibited a large amount of ice melting in the CMAs at -5℃ and -12℃. The ability of ice melting was improved with adding of potassium hydroxide in the process of CMA preparation. The calcium chloride and sodium chloride deicers showed a serious iron corrosion but the corrosion did not occur in the CMA and potassium hydroxide added CMA.

홍채고정 안내렌즈삽입술 후 장기간 경과관찰에 따른 각막내피세포수의 감소 3예

박재성(Jae Sung Park),박병건(Byung Gun Park),최봉준(Bong Joon Choi),이종수(Jong Soo Lee) 대한안과학회 2017 대한안과학회지 Vol.58 No.4

목적: 근시환자에서 홍채고정 안내렌즈(ArtisanⓇ lens) 삽입 후 장기간 경과관찰에서 심한 내피세포수 감소가 있었던 3예를 보고하고자 한다. 증례요약: 32세 여성이 양안의 근시로 홍채고정 안내렌즈삽입술을 시행받았다. 술 전 각막내피 세포밀도는 우안 2,556 cells/mm2, 좌안 2,674 cells/mm2였으나, 4년 후 경과관찰에서 우안 1,968 cells/mm2, 좌안 1,997 cells/mm2로 감소하였다. 양안 홍채고정 안내렌즈삽입술을 시행받은 27세 여성은 술 전 각막내피 세포밀도가 우안 3,222 cells/mm2, 좌안 3,122 cells/mm2였으나, 4년 8개월 후 우안 2,729 cells/mm2, 좌안 2,488 cells/mm2로 감소하였다. 타 안과에서 양안 안내렌즈삽입술을 시행받은 후 좌안의 안압상승으로 당일 안내렌즈를 제거한 후 전원된 39세 여성의 좌안에 홍채고정 안내렌즈삽입술을 시행하였다. 술 전 각막내피 세포밀도는 좌안 2,500 cells/mm2였으나, 8년 후 방문 시 1,873 cells/mm2로 감소되어 있어, 홍채고정 안내렌즈를 제거하고 백내장수술을 시행하여 6개월째 내피세포수는 1,412 cells/mm2였다. 결론: 홍채고정 안내렌즈삽입술은 안전하고 효과적인 근시교정 방법이지만 4년 이상 장기간 경과관찰을 통한 각막내피세포밀도 검사가 필요할 것으로 생각된다. Purpose: To report three cases of severe endothelial cell density loss after iris claw phakic intraocular lens (Artisan?? lens) implantation. Case summary: A 32-year-old woman underwent iris claw intraocular lens implantation in both eyes. Preoperative corneal endothelial cell count was 2,556 cells/mm2 in the right eye and 2,674 cells/mm2 in the left eye. After 4 years, the corneal endothelial cell count was 1,968 cells/mm2 in the right eye and 1,997 cells/mm2 in the left eye. A 27-year-old woman underwent iris claw intraocular lens implantation in both eyes. Preoperative corneal endothelial cell count was 3,222 cells/mm2 in the right eye and 3,122 cells/mm2 in the left eye. After 4 years 8 months, the corneal endothelial cell count was 2,729 cells/mm2 in the right eye and 2,488 cells/mm2 in the left eye. A 39-year-old woman underwent phakic intraocular lens implantation in other clinic, and the lens of left eye was removed the same day because of elevated intraocular pressure. She underwent iris claw intraocular lens implantation in the left eye. Preoperative corneal endothelial cell count was 2,500 cells/mm2 in the left eye, which decreased to 1,873 cells/mm2 after 8 years. Six months after intraocular lens removal and cataract surgery, her cornea endothelial cell count was 1,412 cells/mm2. Conclusions: Although iris-fixed intraocular lens implantation is safe and effective for correcting myopia, at least 4 years of long-term observation for evaluating corneal endothelial cell density maybe necessary.

결막 표면에 융기된 흑색세포종양의 임상양상

장수경(Su Gyeong Jang),박병건(Byung Gun Park),박영민(Young Min Park),이종수(Jong Soo Lee) 대한안과학회 2016 대한안과학회지 Vol.57 No.11

목적: 결막 표면에 융기된 흑색세포 종양의 임상양상 및 특징에 대하여 알아보고자 하였다. 대상과 방법: 세극등 현미경 검사에서 결막 표면의 융기된 흑색세포종양으로, 절제 생검을 시행 받은 환자 33명(남자 16명, 여자 17명), 33안의 의무기록을 후향적으로 분석하였다. 결과: 환자의 종양이 최종진단까지 걸리는 기간은 10년 이내가 76%였으며, 10년 이상은 24%로 15년에서 50년까지 다양하였다. 절제생검결과는 복합모반이 13안(40%), 상피하모반이 9안(27%), 이형성이 동반되지 않은 원발성 후천성 흑색증 8안(24%), 그리고 악성흑색종이 3안(9%)이었다. 복합모반은 각막 이측에 위치한 경우가 54%, 구결막에 위치한 경우가 77%로 가장 많았고 61%가 갈색의 색소성 변화를 보였다. 병변의 평균 직경은 24 mm로, 멜라닌 모반세포가 결막 상피 및 상피하 기칠층에 복합적으로 존재하였다. 상피하모반은 각막 이측(56%), 구결막에 위치(78%)한 경우가 많았고 78%에서 갈색을 띠었다. 이 병변의 평균직경은 28 mm였고, 멜라닌모반세포가 상피하 기질층에서만 관찰되면서 nest shape을 형성하였다. 이형성이 동반되지 않은 원발성 후천성 흑색종은 각막 비측(62.5%), 구결막에 위치(75%)하는 경우가 많았고 갈색의 색소성 변화를 보이는 경우(75%)가 가장 많았다. 평균직경은 30 mm, 조직학적으로 멜라닌 모반세포가 상피층 바닥막에 국한되어 있었다. 악성 흑색종은 3안으로 모두 각막 상측의 검결막에 위치하였고, 검은색소성 변화가 있으면서, 평균 직경이 53 mm로 조직소견상 암세포가 결막 및 결체조직의 전층에 분포하였다. 결론: 결막 표면의 흑색세포종양이 검결막에 위치하면서 병변의 범위가 넓고 표면으로 융기되는 검은색의 색소침착을 보이는 경우악성흑색종으로 의심되기에 조기에 생검 및 적극적인 절제술이 필요할 것으로 생각된다. <대한안과학회지 2016;57(11):1691-1698> Purpose: To investigate the clinical manifestations and characteristics of extruded conjunctival melanocytic mass. Methods: A total of 33 patients who had extruded conjunctival melanocytic mass and who underwent excisional biopsy were retrospectively reviewed. Results: Based on the excisional biopsy results, 13 patients (40%) were diagnosed with compound nevus, nine patients (27%) with subepithelial nevus, eight patients (24%) with primary acquired melanosis without atypia, and three patients (9%) with malignant melanoma. Compound nevus was located on the temporal side of the cornea in 54% of affected cases, bulbar conjunctival in 77%, and was partially pigmented (brown) in 61%. The average size of the melanocytic mass was 24 mm when histological analysis showed melanin nevus cells in the conjunctival epithelial layer and subepithelial stromal layer. Subepithelial nevus was located on the temporal side of the cornea (56%) and in the bulbar conjunctival (78%) and had a brown color (78%). The average size of the melanocytic mass was 28 mm when histological analysis showed melanin nevus cells located only in the subepithelial stromal layer and forming nest shapes. Primary acquired melanosis without atypia was located on the temporal side of the cornea (62.5%) and bulbar conjunctival (75%) and had brown color (75%). The average size of melanin nevus cells located only in the basement membrane of the epithelial layer was 30 mm. Three of these masses were malignant melanoma, and all cases were located on the superior side of the cornea and palpebral conjunctiva. All cases were black and had an average size of 53 mm, with malignant cells observed in all layers of the conjunctiva and connective tissue. Conclusions: A conjunctival melanocytic mass located on the palpebral conjunctiva, extruding onto the surface, and large in size should be suspected as malignant melanoma. In such cases, early biopsy and aggressive resection are required. J Korean Ophthalmol Soc 2016;57(11):1691-1698

가스금속 아아크 용접용(Gas Metal Arc Welding) 로보트제어기 개발에 관한 개론

피원일(Won Il Pee),박병건(Byung Gun Park),김정호(Jung-Ho Kim),고광일(Kwangill Koh) 대한전기학회 1993 대한전기학회 학술대회 논문집 Vol.1993 No.7

조류발전시스템의 최대출력 제어 알고리즘

김지원(Ji-Won Kim),박병건(Byung-Gun Park),이진규(Jin-Kyu Lee),이재운(Jae-Woon Lee) 대한전기학회 2019 정보 및 제어 심포지엄 논문집 Vol.2019 No.10

급격한 시력저하를 동반한 특발안와근염의 수술적 진단 및 치료 1예

이동은(Dong Eun Lee),박병건(Byung Gun Park),문성혁(Sung Hyuk Moon),양재욱(Jae Wook Yang) 대한안과학회 2017 대한안과학회지 Vol.58 No.10

목적: 급격히 진행하는 시력저하와 비특이적으로 외직근 첨부 비대를 보이는 환자에서 안와생검을 시행하여 특발안와근염을 진단하고, 부신피질호르몬 정맥주사로 치료한 증례를 보고하고자 한다. 증례요약: 2주 전부터 발생한 왼눈 시력저하를 주소로 20세 여자 환자가 내원하였다. 최대교정 시력은 왼눈 0.2였으며, 교대프리즘가림검사상 왼눈 40프리즘디옵터 내사시가 관찰되었다. 자기공명영상에서 왼눈 외직근 첨부의 둥근 형태 비대와 시신경 압박을 확인하였고, 안와림프종 및 안와생검이 필요한 질환의 감별을 위해 안와생검을 계획하였다. 3주 후 입원 당시 왼눈 최대교정시력 0.02로 악화되었고, 재촬영한 자기공명영상에서 왼눈 직근 모두의 비대를 보였다. 안와생검결과 림프구가 근섬유를 침범하는 소견으로 외안근염을 진단할 수 있었다. 고용량 부신피질호르몬 정맥주사 시행 2주 후 왼눈 최대교정시력은 0.63으로 호전되었고, 내사시는 소실되었으며 자기공명영상에서 왼눈 직근의 비대는 호전되었다. 결론: 안와첨부에 위치하고 단기간에 다발성으로 외안근의 크기가 커지는 비특이적 특발안와근염의 경우 급격한 시력저하가 나타날 수 있으므로 안와생검 전에 고용량 부신피질호르몬 치료를 병행하는 것이 시력 회복에 도움이 된다. Purpose: We report a case of idiopathic orbital myositis with sudden onset of unilateral visual loss and hypertrophy of the lateral rectus muscle at the apex of the orbit that was diagnosed using orbital biopsy and treated with intravenous corticosteroids. Case summary: We examined a 20-year-old woman who complained of decreased visual acuity and binocular diplopia for 2 weeks. She showed 40-prism diopter left esotropia at the primary position. Her visual acuity with eyeglasses was 0.7 and 0.2 in the right and left eyes, respectively. Brain magnetic resonance imaging (MRI) revealed a round mass on the left lateral rectus muscle at the apex of the orbit with optic nerve compression. We planned orbital biopsy to exclude orbital lymphoma and other biopsy-requiring diseases. After 3 weeks, the visual acuity of her left eye decreased to 0.02. Repeated MRI revealed enlargement of all extraocular muscles on the left orbit. With biopsy showing several lymphocytes infiltrating muscle fibers, we made a diagnosis of idiopathic orbital myositis. Intravenous injection of corticosteroids was administered during hospitalization. After 2 weeks of corticosteroid therapy, the visual acuity of her left eye was improved to 0.63, the esotropia disappeared, and the enlargement of the left lateral rectus muscle was improved on orbital MRI. Conclusions: For non-specific idiopathic orbital myositis located at the apex of the orbit and enlargement of the extraocular muscle in a short period with decreased visual acuity, administration of intravenous injection of corticosteroids before orbital biopsy could help restore vision.

선박용 2-회전자 전동기 설계 및 제어

박준신(Jun-Shin Park),박병건(Byung-Gun Park),정연호(Yeon-Ho Jeong),김지원(Ji-Won Kim) 대한전기학회 2023 대한전기학회 학술대회 논문집 Vol.2023 No.7