Comparison of the 20-Gauge Conventional Vitrectomy Technique with the 23-Gauge Releasable Suture Vitrectomy Technique

김인근,이수정,박정민 대한안과학회 2013 Korean Journal of Ophthalmology Vol.27 No.1

Purpose: To compare the efficacy of the transconjunctival releasable suture technique for pars plana vitrectomy using 23-gauge (23G) instruments versus the conventional 20-gauge (20G) technique. Methods: A retrospective and interventional case series was consecutively performed for 199 eyes of the 192 patients that were a part of this study. Clinical data were reviewed retrospectively regarding the operation time, preoperative and postoperative intraocular pressure, visual acuity and astigmatism for 54 consecutive patients who received a 23G releasable suture vitrectomy and for 98 consecutive patients who received a 20G conventional vitrectomy during the period between April 2007 and September 2010. Results: Mean operation time based on the operation record was 88.5 ± 20.1 minutes in the 23G releasable suture vitrectomy group and 102.1 ± 23.1 minutes in the 20G conventional vitrectomy group, respectively (p = 0.01). The last best-corrected visual acuity (BCVA) was significantly better than the preoperative BCVA in both patient groups (p = 0.01, p = 0.01). The 23G releasable suture group showed less surgically induced astigmatism than the 20G conventional vitrectomy group. Vitreous bleeding was observed to be in 6 eyes (5.9%) in the 23G group, and in 8 eyes (8.2%) in the 20G group. In addition, ocular hypertension was noted to be in 3 eyes (3.0%) in the 23G group, and 6 eyes (6.1%) in the 20G group. No serious complications such as postoperative hypotony or endophthalmitis were observed in either group. Conclusions: The 23G releasable suture technique is as effective as the 20G conventional technique and offers several advantages.

도시형 자기부상열차 개발 및 실용화 전망

김인근(Kim In-Kun),이상록(Lee Sang-Rok),조흥제(Cho Hung-Je),유문환(Yoo Mun-Hwan),김봉섭(Kim Bong-Seup),성호경(Sung Ho-Kyung),이종민(Lee Jong Min) 한국철도학회 2000 한국철도학회 학술발표대회논문집 Vol.- No.-

The status of the maglev development in Korea is reported along with related commercial application prospects. The 1st test vehicle, Urban Transit Maglev-01, is in the running tests, and is now entered a new phase in which a new vehicle be built within 3 years. Eventhough Korean maglev teams made remarkable progress for 10 years since 1990, major portion of the works to prove safety and reliability remains for the future. Many LRT routes are being planned by the Korean government and UTM will find its commercial application if we can prove many merits of the maglev system plus its reliability. But the commercial application efforts did not produce any outcome at the time because the customer wasn"t totally satisfied with the new system and also, they decided it wasn"t urgently needed.

한국의 과학기술 어디까지 왔나-자기부상열차

김인근,Kim, In-Geun 한국과학기술단체총연합회 1994 과학과 기술 Vol.27 No.11

자기부상열차 개발을 위한 시스템 엔지니어링기술

김인근,유문환,Kim, In-Geun,Yu, Mun-Hwan 재료연구소 1997 機械와 材料 Vol.9 No.2

방광종양으로 오인한 포충낭종 1례

김인근,김두용,문일,김택상,옥미선,오경승,류현열 대한비뇨의학회 2004 Investigative and Clinical Urology Vol.45 No.12

Hydatid disease is a parasitic infection that is caused by the larval stage of Echinococcus granulosus. This disease is widely distributed in a temperate and subtropical countries, and it is especially prevalent in sheep and cattle raising countries. The most common infection site is the liver, and the second most common site is the lung. We report here on our experience with Echinococcal hydatid cysts that were found in the bladder of a 38 year old worker from Uzbekistan. The cysts were surgically removed and the patient was managed postoperatively with albendazole. (Korean J Urol 2004;45:1292-1295)

자기부상열차 개발현황과 추진전략

김인근,유문환,Kim, In-Geun,Yu, Mun-Hwan 재료연구소 1991 機械와 材料 Vol.3 No.2

혈관빛간섭단층촬영을 이용한 정상인과 당뇨망막병증 환자에서의 망막중심오목 무혈관부위 분석

김인근,이주은 대한안과학회 2017 대한안과학회지 Vol.58 No.8

Purpose: To evaluate the effectiveness of optical coherence tomography angiography (OCTA) in investigating changes in the area of the foveal avascular zone (FAZ) in patients with diabetic retinopathy (DR) and normal subjects. Methods: Eighty-five eyes of 50 DR patients and 50 eyes of 25 normal subjects were included. OCTA images of the FAZ were acquired using the split-spectrum amplitude decorrelation angiography algorithm of Optovue Avanti RTVue XR OCT. Patients were divided into three groups according to DR severity: mild-to-moderate non-proliferative diabetic retinopathy (NPDR) group, severe NPDR group, and proliferative DR group. The area of the FAZ was measured using built-in software and was compared between the patients and normal subjects and among the three groups. Results: The area of the FAZ in patients with diabetic retinopathy (0.46 mm2) was significantly larger than that in normal subjects (0.30 mm2, p = 0.001). A significant difference was observed depending on DR severity: 0.40 mm2 in the mild-to-moderate NPDR group, 0.45 mm² in the severe NPDR group, and 0.53 mm2 in the PDR group (p = 0.03). Correlation between area of the foveal avascular zone and visual acuity showed a tendency toward reduction in visual acuity (p = 0.002). Conclusions: OCTA effectively detected changes in the FAZ area in DR patients. OCTA has the potential to be used for noninvasive quantification and monitoring of the FAZ. 목적: 당뇨망막병증 환자를 대상으로 혈관빛간섭단층촬영을 이용하여 망막중심오목 무혈관부위를 측정하고 정상 대조군과 비교하여 혈관빛간섭단층촬영의 임상적 유용성에 대해 알아보고자 하였다. 대상과 방법: 당뇨망막병증 50명 85안과 정상 대조군 25명 50안을 비교 대상으로 하였다. Optovue Avanti RTVue XR optical coherence tomography를 이용하여 망막중심오목 무혈관부위의 혈관 영상을 얻은 후 면적측정 기능을 이용하여 망막중심오목 무혈관부위의 면적을 측정하고, 정상인과 당뇨망막병증 환자에서의 차이, 당뇨망막병증의 진행정도에 따른 차이를 비교하였다. 당뇨망막병증 환자는 진행 정도에 따라 경도-중등도 비증식당뇨망막병증, 심한 비증식당뇨망막병증, 그리고 증식성당뇨망막병증으로 나누어 비교하였다. 결과: 당뇨망막병증 환자의 망막중심오목 무혈관부위(0.46 mm2)는 정상 대조군(0.30 mm2)에 비해 의미 있게 넓게 측정되었다(p=0.001). 망막중심오목 무혈관부위를 당뇨망막병증의 정도에 따라 비교했을 때 세 군 간의 의미 있는 차이를 보였다(경도-중등도비증식당뇨망막병증; 0.40 mm2, 심한 비증식당뇨망막병증; 0.45 mm2, 증식성당뇨망막병증; 0.53 mm2, p=0.03). FAZ의 면적과 최대교정시력과의 연관성을 조사하였을 때 FAZ가 넓어질수록 시력이 떨어지는 음의 상관관계를 보였다(p=0.002). 결론: 혈관빛간섭단층촬영은 당뇨망막병증 환자에서 망막중심오목 무혈관부위를 비침습적으로 측정하고 이를 정량화할 수 있어, 당뇨망막병증의 경과 관찰에 유용하게 활용할 수 있을 것으로 사료된다.

Ionic Framework를 이용한 모바일 학사 정보 앱 설계 및 개발

김인근(In-Geun Kim),강명주(Myung-Ju Kang) 한국통신학회 2015 한국통신학회 학술대회논문집 Vol.2015 No.11

Anterior Ischemic Optic Neuropathy Associated with Udenafil

김인근,김대윤 대한안과학회 2012 Korean Journal of Ophthalmology Vol.26 No.3

We report a case of anterior ischemic optic neuropathy associated with udenafil. A 54-year-old male presented with an acute onset visual field defect of the right eye after udenafil use. Examination revealed a relative afferent pupillary defect and a swollen disc. Automated visual fields revealed an enlarged blind spot and a narrowed visual field. Fluorescein angiography revealed both an inferior choroidal filling delay and an inferior sector filling delay of the optic disc in the arteriovenous phase as well as diffuse leakage of the optic disc in the late phase. Optical coherent tomography revealed increased thickness of the retinal nerve fiber layer, especially in the area of the inferior disc. The patient was counseled to discontinue the use of udenafil and to monitor his blood pressure regularly. The disc swelling was resolved with residual optic atrophy one month after discontinuing the use of udenafil.

A Study on the Stable Sensorless Control of BLDC Motor Inside Auxiliary Air Compressor

김인근,홍현석,고성철,오예준,주경진,이주 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.1

Pantograph must be correctly attached to catenary to continuously supply stable power to railway vehicle, and the device used here is Auxiliary Air Compressor (ACM). The existing ACM used the DC motor that included commutator and brush. Since maintenance and repair by mechanical friction are essential for the DC motor, BLDC motor studies have been conducted to improve this. A three-phase BLDC motor does 120° two-phase commutation through hall sensors in general. However, since hall sensor is vulnerable to heat and can run only when all three sensors work normally, sensorless control method has been studied to solve this. Using back EMF Zero Crossing Point (ZCP) detection method, this paper will introduce a stable switching sensing method that has a noncommutation area in a low speed zone.