http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
조정우,정소향,서경률,김응권,Jung-Woo Cho,M,D,Soh-Hyang Chung,M,D,Kyoung-Yul Seo,M,D,Eung-Kweon Kim,M,D 대한안과학회 2005 대한안과학회지 Vol.46 No.9
Purpose: To compare postoperative recurrence rates between conjunctival autotransplant ation and the conjunctival mini-flap technique in pterygium surgery and to identify factors associated with postoperative recurrence. Methods: In a retrospective survey of patients who underwent pterygium surgery between March, 2001 and February, 2004 at Severance Hospital, 49 eyes with pterygium removed by the conjunctival mini-flap technique and 41 eyes that underwent pterygium removal surgery by the conjunctival autotransplantation technique were studied. Results: During the mean follow-up period of 8.79±3.9 months, recurrence of pterygium was observed in 3 of 49 eyes (7.1%) that received the conjunctival mini-flap technique. There were 9 recurrent cases out of 41 eyes (21.9%) that were treated by the conjunctival autotransplantation technique. There was no statistical significance between recurrence rate and age, sex, or previous operation in either of the respective surgical techniques. Conclusions: This study showed that the conjunctival mini-flap technique has a lower recurrence rate than the conjunctival autotransplantation technique. We also found that the conjunctival mini-flap technique is an effective and safe technique that does not generally cause serious complications.
전기화학적 분석을 통해 산출된 코팅 결함율이 트라이볼로지적 특성에 미치는 영향 평가
김우중(Woo-Jung Kim),안승호(Seung-Ho Ahn),김호건(Ho-Gun Kim),김정구(Jung-Gu Kim),조정우(Chung-Woo Cho),이영제(Young-Ze Lee) 한국트라이볼로지학회 2004 한국트라이볼로지학회 학술대회 Vol.38 No.-
Recently, many of the current development in surface modification engineering are focused on multilayered coatings. Multilayered coatings have the potential to improve the tribological properties. Four different multilayered coatings were deposited on AISI D2 steel. The prepared samples are designed as WC-Ti0.6Al0.4N, WC-Ti0.6Al0.4N, WC-Ti0.53Al0.47N and WC-Ti0.43Al0.57N. The multilayered coatings were investigated with respect to coating surface and cross-sectional morphology, roughness, adhesion, hardness, porosity and tribological behavior. Especially, wear tests of four multilayered coatings were performed by using a ball-on-disc configuration with a linear sliding speed of 0.017 m/sec, 5.38 N load. The tests were carried out at room temperature in air by employing AISI 52100 steel ball (HR = 66) having a diameter of 10 ㎜. The surface morphology, and topography of the wear scars of samples and balls have been determined by using scanning electron spectroscopy (SEM). Also, wear mechanism was determined by using SEM coupled with EDS. Results have showed an improved wear resistance of the WC-Ti1-xAlxN coatings with increasing of Al concentration.
전기화학적 분석을 통해 산출된 코팅 결함율이 트라이볼로지적 특성에 미치는 영향 평가
김우중(Woo-Jung Kim),안승호(Seung-Ho Ahn),김호건(Ho-Gun Kim),김정구(Jung-Gu Kim),조정우(Chung-Woo Cho),이영제(Young-Ze Lee) 한국트라이볼로지학회 2004 한국윤활학회지(윤활학회지) Vol.20 No.6
Many of the current development in surface modification engineering are focused on multilayered coatings, which have the potential to improve the tribological properties. Four different multilayered coatings were deposited on AISI D2 steel in this study. The prepared samples are designed as WC-Ti_(0.6)Al_(0.4)N, WCTi_(0.53)Al_(0.47)N, WC-Ti_(0.5)Al_(0.5)N and WC-Ti_(0.43)Al_(0.57)N. The multilayered coatings were investigated with respect to coating surface and cross-sectional morphology, roughness, adhesion, hardness, porosity and tribological behaviors. Especially, wear tests of four multilayered coatings were performed by using a ball-on-disc configuration with a linear sliding speed of 0.017 m/sec and a normal load of 5.38 N load. The tests were carried out at room temperature in air by employing AISI 52100 steel ball (H_R = 66) having a diameter of 10 ㎜. The surface morphology, and topography of the wear scars of samples and balls have been determined by using scanning electron spectroscopy (SEM). Also, wear mechanism was determined by using SEM coupled with energy-dispersive spectroscopy (EDS). Results have showed an improved wear resistance of the WC- Ti_(1-x)AlxN coatings with increasing of Al (aluminum) concentration.
양안 라식 수술 후에 발생한 단안의 급성 각막수종의 임상증례
정소향,조정우,김응권,So-Hyang Chung,Jung-Woo Cho,Eung-Kweon Kim,Ph,D 대한안과학회 2005 대한안과학회지 Vol.46 No.7
Purpose: To report a case of a patient who underwent penetrating keratoplasty due to acute hydrops six years after undergoing a bilateral LASIK procedure. Methods: A 19-year old male patient with -2.75 diopter myopia received a bilateral LASIK operation at a local clinic. Forty-seven months later, -2.00 cyl axis 130o astigmatism was induced in his left eye and additional surgery was performed to correct the LASIK-induced astigmatism. The patient was referred to our hospital 16 months after the secondary operation due to reduced visual acuity in his left eye. He was diagnosed with keratectasia and acute hydrops, and penetrating keratoplasty was performed. Results: The retrospective analysis of the corneal topography prior to the LASIK surgery revealed that the inferior minus superior(I-S) value was 1.25 in the right eye and 1.3 in the left eye. At the time of the first evaluation at out hospital, a slit lamp examination showed an approximate 8x7.5mm sized area filled with aqueous humor between the corneal flap and residual stroma, and Descemet`s membrane rupture was observed. Furthermore, the histopathological section of the patient`s cornea confirmed keratocytes with myxoid degeneration and edematous change. Conclusions: In young patient, particularly those with suspicious asymptomatic keratoconus, LASIK and further enhancement surgery afterwards should be considered and approached in a cautious and deliberate manner.
진동기반 하중 추정기법의 이론 및 암반 천공용 유압 브레이커 적용사례
김대지(Dae-ji Kim),조정우(Jung-Woo Cho),오주영(Joo-Young Oh),정진태(Jintai Chung),송창헌(Changheon Song) 한국암반공학회 2019 터널과지하공간 Vol.29 No.3
본 논문은 기계시스템의 하중추정 기법 및 적용사례 소개가 목적이다. 이를 위해 진동기반 하중추정 기법의 이론적 배경 및 하중정량화 절차를 구체적으로 설명하였다. 또한 충격하중 및 진동이 발생하는 천공장비에 적용하여 진동기반 하중추정 기법의 적용성과 한계점을 분석하고 이에 대한 대응책에 대해 논의하였다. 마지막으로, 하중추정 기술의 추가 연구의 필요성을 토의하고, 새로운 충격하중 측정기술 개발을 위한 방법론을 제안하였다. This paper introduced a impact load estimation method by examining vibration transfer path analysis (TPA). The theoretical background and the load quantification procedure are explained, and a case study of hydraulic breaker is reported. We explained the merits and limitations of the load estimation method of TPA, and improvement method was suggested through case analyses of drilling equipment. The necessity of R&D of load-estimation technology was discussed. A new strategy for developing new techniques for impact load measurement was proposed.