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코경유 눈물주머니코안연결술 전 통상적인 이비인후과 의뢰의 임상적 효용성
장영준,김호창,서억수,Young Jun Jang,Ho Chang Kim,Eok Soo Suh 대한안과학회 2012 대한안과학회지 Vol.53 No.10
Purpose: To determine if routine otorhinolaryngologic referral prior to endonasal dacryocystorhinostomy (EN-DCR) is necessary. Methods: Two hundred thirty-seven eyes of 178 patients who were supposed to undergo EN-DCR were prospectively analyzed. Nasal endoscopy was performed by an ophthalmologist and the patients who had severe abnormality were referred to an otorhinolaryngologist. The patients were classified into 3 groups after a preoperative examination by an ophthalmologist and an otorhinolaryngologist; the number and success rate of each group were then investigated. Group A consisted of patients who had no nasal cavity abnormality, Group B consisted of patients with a nasal cavity abnormality but who received no treatment, and Group C consisted of patients who had a nasal cavity abnormality and received otorhinolaryngologic treatment. Results: The number of subjects in each group was 156 in Group A (87.7%), 12 in Group B (6.7%), and 10 in Group C (5.6%). The number of patients who were referred to the otorhinolaryngologist was 22 (12.3%). There was no statistical significance of success rate between the groups. Conclusions: Routine nasal endoscopic examination should be performed by an ophthalmologist prior to EN-DCR. Only patients with severe abnormal findings should be referred to an otorhinolaryngologist as the results from the present study show the percentage of patients having significant nasal abnormalities was found to be low (12%) and the success rate of EN-DCR revealed no statistical significance between the groups. This could help patients by saving time and expense. J Korean Ophthalmol Soc 2012;53(10):1392-1396
DLC (ta-C) 후막코팅을 위한 트라이볼로지 코팅 연구
장영준(Young-Jun Jang),강용진(Yong-Jin Kang),김기택(Gi Taek Kim),김종국(Jongkuk Kim) 한국트라이볼로지학회 2016 한국윤활학회지(윤활학회지) Vol.32 No.4
In recent years, thick ta-C coating has attracted considerable interest owing to its existing and potential commercial importance in applications such as automobile accessories, drills, and gears. The thickness of the ta-C coating is an important parameter in these applications. However, the biggest problems are achieving efficient coating and uniformity over a large area with high-speed deposition. Feasibility is confirmed for the ta-C coating thickness of up to 9.0 μm (coating speed: 3.0 μm/h, fixed substrate) using a single FCVA cathode. The thickness was determined using multiple coating cycles that were controlled using substrate temperature and residual stresses. In the present research, we have designed a coating system using FCVA plasma and produced enhanced thick ta-C coating. The system uses a specialized magnetic field configuration with stabilized DC arc plasma discharge during deposition. To achieve quality that is acceptable for use in automobile accessories, the magnetic field, T-type filters, and 10 pieces of a multi-cathode are used to demonstrate the deposition of the thick ta-C coating. The results of coating performance indicate that uniformity is ±7.6 , deposited area is 400 mm, and the thickness of the ta-C coating is up to 5.0 μm (coating speed: 0.3 μm/h, revolution and rotation). The hardness of the coating ranges from 30 to 59 GPa, and the adhesion strength level (HF1) ranges from 20 to 60 N, depending on the ta-C coating.
장영준(Young-Jun Jang),나종주(Jong-Joo Rha),김석삼(Seock-Sam Kim) 한국트라이볼로지학회 2004 한국트라이볼로지학회 학술대회 Vol.38 No.-
The present work dealt with tribological properties of RCA cleaned Si surfaces in order to eliminate various kinds of contaminants. For this goal, Atomic Force Microscope(AFM) was used to observe nanowear process and evaluate nanowear behavior of Si surface. Nanoscratch tests were carried out using a very sharp diamond tip. Spring constant was 1.6N/m. Normal force used in the scratch tests ranged from 0 to 358nN. It was found that specimens exhibited two types of nanowear processes during scratching. The first one was surface depression due to plastic deformation and abrasive wear(cutting & ploughing). The second process was controlled by surface upheaval on scratched surface as a pre-stage wear by scratching and molecules from the absorbed air, such as oxygen and/or water and other chemical compounds. It was corresponding to experimental results of microwear process by Kaneko.