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조지호(Jo Ji Ho),김용현(Kim Yong Hyeon) 한국경영학회 2003 經營學硏究 Vol.32 No.5
This paper attempts to determine the impact of the prudent man rule in a broader sense in the Korean Stock Market. Particularly, the study investigates patterns of institutional ownership of common stock. The interest is in determining factors that influence the investment choices of the institutional portfolio manager. The sample used here included 357 companies listed on the Korean Stock Market excluding financial institutions continuously between 1990 and 1999. The results show that institutional investors are concerned with the appearance of their portfolio and to avoid extreme ratios. For example, institutions avoid stocks with either a high or low beta, debt ratio, or return on assets.
조지호 ( Ji Ho Jo ),김수관 ( Su Gwan Kim ),김학균 ( Hak Kyun Kim ),문성용 ( Seong Young Moon ),오지수 ( Ji Su Oh ),윤정훈 ( Jung Hoon Yoon ),안상건 ( Sang Gun Ahn ) 조선대학교 치의학연구원 2010 Oral Biology Research (Oral Biol Res) Vol.34 No.1
Objective. This study was performed to investigate the clinical and histopathologic features of chronic osteomyelitis and its treatment in Korean. Subject and Method. A total of 30 patients (mean age: 50.5 years old, 16-81 years old) were examined in this retrospective study. In a treatment protocol used for 30 patients, chronic osteomyelitis of the jaws was treated by surgical intervention and 2 weeks of intravenous antibiotics, followed by 6 weeks of oral antibiotics. Surgical therapy consisted of decortication or sequestrectomy and saucerization of the affected bone. A successful outcome was defined as the resolution of symptoms after surgery and 8 weeks of antibiotic therapy. Failure was defined as a case requiring a second surgery and 8 additional weeks of antibiotic therapy. Result. After application of the treatment protocol, successful outcome was seen in most patients. Some patients were treated successfully with a second surgery and 8 additional weeks of antibiotic therapy. Conclusion. According to this study, surgery followed by antibiotic therapy for at least 8 weeks is an effective method for treating chronic osteomyelitis of the jaws.
하악 전치부 임플란트 식립 후에 발생한 과다출혈: 증례보고
조지호,김수관,문성용,오지수,김정선,Jo, Ji-Ho,Kim, Su-Gwan,Moon, Seong-Yong,Oh, Ji-Su,Kim, Jeong-Sun 대한악안면성형재건외과학회 2011 Maxillofacial Plastic Reconstructive Surgery Vol.33 No.2
Implant placement on the anterior mandible is considered a common and safe surgical procedure. However, severe hemorrhage can occur if branches of the sublingual artery, which run through the lingual cortical plate of the mandible, are damaged. Excessive hemorrhage caused by injury to the sublingual artery can result in life-threatening problems such as airway obstruction. A 54-year old male patient without any generalized systemic conditions was referred due to active bleeding after implant placement in the anterior mandible. Gauze compression with surgicel and bosimin were performed and hemostasis was achieved. The patient was discharged after 3 days without any supplementary bleeding.
Sandblasted, Large-grit and Acid-etched Implant에 대한 후향적 임상 연구
조지호,김수관,문성용,오지수,박진주,정종원,윤대웅,양성수,정미애,Jo, Ji-Ho,Kim, Su-Gwan,Moon, Seong-Yong,Oh, Ji-Su,Park, Jin-Ju,Jung, Jong-Won,Yoon, Dae-Woong,Yang, Seong-Su,Jeong, Mi-Ae 대한악안면성형재건외과학회 2011 Maxillofacial Plastic Reconstructive Surgery Vol.33 No.4
Purpose: This study evaluated the prognosis and survival rate of SLA (Sandblasted, Large-grit and Acid-etched) implants and it also evaluated the prosthodontic complications and the associated factors. Methods: Twenty seven patients (14 men and 13 women, mean age: 54.9) who visited Chosun University Hospital Implant Center with the chief desire for placement of an implant in an edentulous area from March, 2008 to December 2008 and who received placement of a SLA implant ($Implantium^{(R)}$, Dentium Co., Korea) were selected for this study. Results: The average follow-up period was 15 months and the study was based on the treatment records, radiographs and clinical examinations. A total of 69 implant cases were retrospectively assessed for the width and length of the implant, the primary and secondary stability, the combined surgery, the employed bone graft material and barrier membrane, the status of the opposing tooth, implant failure and the prosthetic complications. During the follow-up period (average: 15 months), the accumulative survival rate of the 69 implants in 27 patients was 100%. Complications such as infection, sinusitis and fixture exposure after surgery were seen for 5 implants in 4 patients. Complications such as screw loosening, contact loosening and peri-implant gingivitis after prosthodontic treatment occurred in 7 cases (10.14%). Conclusion: This study reports placement of SLA implants may cause various complications, yet the final accumulative survival rate was 100%. The SLA implant ($Implantium^{(R)}$) has an excellent clinical survival rate and outcome.
탈단백우골과 비탈회 동종골을 사용한 상악동 거상술의 임상적 연구
조지호,김수관,문성용,오지수,Jo, Ji-Ho,Kim, Su-Gwan,Moon, Seong-Yong,Oh, Ji-Su 대한악안면성형재건외과학회 2010 Maxillofacial Plastic Reconstructive Surgery Vol.32 No.5
Purpose: The purpose of this study was to compare the clinical efficacy of popular bone graft materials mineralized allograft and deproteinized bovine bone mineral. Materials and Methods: One hundred seven implants of 78 patients, accompanied by sinus lift using the lateral window technique and simultaneous implantation, were sampled. In addition, some patients with severe systemic conditions were excluded. The initial bone heights of all patients ranged from 3-6 mm. All of the sample cases were treated at our hospital from January 2005 to January 2008. Techniques other than the lateral window technique were excluded, and only one graft material ($Tutoplast^{(R)}$ or Bio-$Oss^{(R)}$) was accepted for inclusion. $Tutoplast^{(R)}$ was used in 63 implants of 41 patients, whereas Bio-$Oss^{(R)}$) was chosen for the remaining 44 implants of 37 patients. The diameters of the particles used ranged from 0.25-1.0 mm, and the volume was 0.5-2 cc (mean, 1.5 cc). Results: The survival rate of the implant fixtures was 99.07% when the lateral window technique was used. Among all of the cases, cases in which $Tutoplast^{(R)}$ was used demonstrated a survival rate of 98.4%, whereas Bio-$Oss^{(R)}$) resulted in 100% survival. With respect to the alveolar bone height, no significant differences were detected between the two graft materials that failed. Conclusion: According to the result reported above, the two common materials for sinus augmentation do not have clinically significant difference. Rather, host factors, such as the height of residual bone, which could be disclosed during questioning patients' systemic conditions, might have greater effects on the prognosis.
의도적으로 연조직에 노출시킨 수산화인회석 코팅 임플란트의 골유착과 안정성에 대한 실험적 연구
정경인,김수관,문성용,오지수,조지호,임형섭,김정선,임성철,정미애,Jeong, Kyung-In,Kim, Su-Gwan,Moon, Seong-Yong,Oh, Ji-Su,Jo, Ji-Ho,Lim, Hyoung-Sup,Kim, Jeong-Sun,Lim, Sung-Chul,Jeong, Mi-Ae 대한악안면성형재건외과학회 2012 Maxillofacial Plastic Reconstructive Surgery Vol.34 No.1
Purpose: The purpose of this study is to evaluate the effect of exposure of hydroxyapatite coating on the amount of bone formation and stability in the dogs. Methods: In this study, hydroxyapatite coated implants (HAPTITE) was placed over the femur bone surface of four dogs about 1 mm. The experimental group was divided into 4 weeks group of 8 implants and 8 weeks group of 8 implants, and then they were sacrificed. The stability of implants was evaluated twice with Osstell$^{TM}$ mentor (Osstell AB, Goteborg, Sweden) at right after placement and sacrifice. The amount of bone formation was evaluated through histomorphometric examination. Results: The stability of implants was in normal range, and tended to increase as time goes by. Mean percentages of new bone formation rates were $90.5{\pm}6.6$ at uppermost 1 mm bone level adjacent to soft tissues (level 1) and $92.9{\pm}4.1$ at next 1 mm bone level (level 2) in 4 weeks group, $90.1{\pm}11.5$ at level 1 and $95.9{\pm}2.3$ at level 2 in 8 weeks group. Mean percentages of bone-implant contact rates were $85.1{\pm}10.8$ at level 1 and $88.1{\pm}13.8$ at level 2 in 4 weeks group, $88.5{\pm}14.4$ at level 1 and $95.3{\pm}3.1$ at level 2 in 8 weeks group. There was no statistically significant difference of new bone formation rate and bone-implant contact rate between uppermost 1 mm bone level adjacent to soft tissues and next 1 mm bone level. However, there was no significant difference in bone formation between 4 and 8 weeks groups. Conclusion: These results suggested that exposed hydroxyapatite coated implants to soft tissue showed favorable bone formation and implant stability.
ALD 방법으로 제조된 나노급 TiO₂에 의한 자외선 차단효과 연구
한정조(Han, Jeung-Jo),윤기정(Yoon, Ki-Jeong),송오성(Song Ohsung),류지호(Ryu, Ji-Ho) 한국산학기술학회 2007 한국산학기술학회논문지 Vol.8 No.4
ALD (atomic layer deposition)법을 이용하여 두께를 달리한 10~50 ㎚-TiO₂-x/quanz 구소의 UV 기능성 박막을 형성시켰다. 박막의 두께는 우선 10 ㎚-TiO₂-x를 성막한 후 엘립소미터로 두께를 확인하였고 나머지 두께는 증착시간을 선형적으로 조절하여 완성하였다. TiO₂ 박막 두께에 따른 생성상과 파장대별 흡수도, 가시광선의 투과율을 각각 X선 회절기, UV-VIS-IR 분석기, 접사용 디지털 카메라를 써서 확인하였다. ALD 법으로 제조된 TiO₂-x는 벌크 TiO₂에 비해 비정질 (amorphous)이면서 비정량적인 TiO₂-x 형태임을 확인하였다. 380 ㎚와 415 ㎚의 흡수단을 보여 3.0-3.2 eV의 밴드갭을 가지는 기존의 벌크 TiO₂와는 달리, 제작된 TiO₂-x 박막은 197 ㎚와 250 ㎚의 부근에서 흡수단을 보이는 특징이 있었다. 따라서 장파장대의 자외선을 차단하는 기능을 가진 기존의 벌크 TiO₂와는 달리 ALD로 제작된 나노급 ,TiO₂는 단파장대의 자외선을 흡수할 수 있는 기능성이 있었고, 아울러 가시광선대에서 우수한 투과도를 보였다. 새로이 제안된 ALD를 이용한 나노급 ,TiO₂-x 박막은 가시광선의 투과도는 향상시키면서 단파장대의 자외선을 효과적으로 흡수하는 기능성을 가졌음을 확인하였다. We fabricated UV absorption functional 10-50 ㎚-TiO₂-x/quartz structures layer using ALD (atomic layer deposition) method. We deposited 10 ㎚-TiO₂-x layer on quartz substrate using ALD, and film thickness was determined by an ellipsometer. The others specimen thickness was controlled by ALD time lineally. We characterized controlling phase UV and visible optical property using an X-ray difractometer, a UV-VIS-IR spectrometer and a digital camera. ALD-TiO₂-x layers were non-stoichiometric TiO₂-x form and amorphous phases comparing with bulk TiO₂. While the conventional bulk TiO₂ had band gap of 3.0-3.2 eV resulting in absorption edges at 380 ㎚ and 415 ㎚, ALD-TiO₂-x layers showed absorption edges at 197 ㎚ and 250 ㎚. Therefore, our nano-thick ALD- TiO₂-x was able to absorb shorter UV region and showed excellent transmittance in visible region. Our result implies that our newly proposed nano-thick TiO₂-x using ALD process may improve transmittance in visible rays and be able to absorb shorter UV light effectively.