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조지호,정성훈 한국재무관리학회 2009 財務管理硏究 Vol.26 No.2
From the perspective of corporate governance, we examine the acquirers’ performance of mergers and acquisitions in KOSDAQ Market. The empirical results of our study show that inside an executive shareholders and outside minor shareholders, affect acquirers’ performance in M&A’s:the ownership of outside minor shareholders is positively correlated with the performance of acquirers. and, the ownership of insiders, such as that of an executive shareholders, does have significant effect on the performance of M&A’s. Since the current literature concludes that the improvement of corporate governance in KOSDAQ Market would enhance the shareholders’ wealth, the results of our study implies that outside minor investors, as well as insiders, are playing an important role in the corporate governance. 본 연구는 2000~2006년의 기간 동안 발생한 코스닥기업 인수합병결정의 성과를 측정하고 그 성과에 대한 횡단면분석을 통해 기업지배구조가 합병성과를 설명할 수 있는지 검토하였다. 본 연구를 통해 지분변수 등 기업지배구조 변수들이 합병성과의 횡단면 차이에 대해 상당한 설명력을 지니고 있음을 알 수 있었다. 본 연구의 시사점을 좀 더 구체적으로 서술하면 아래와 같다. 첫째, 지분변수 중에서 임원 지분이 대주주 지분변수, 지분 5% 이상 대량보유자의 지분과 기관투자자의 지분 등 외부 투자자의 지분보다 합병성과에 긍정적으로 영향을 미치는 결과로 나타났다. 둘째, 임원 지분 이외에 중요한 외부 투자자로 인식되는 외국인 지분의 경우, 그 자체로서는 기업합병의 성과에 큰 영향을 미치지 않은 것으로 나타났다. 이것은 선행연구와 달리(김희석ㆍ조경식 2006), 코스닥시장에서 외국인지분의 경우, 합병성과에 영향력이 없음을 알 수 있다. 또한, 소액투자자들도 내부지분과 같이 영향력이 큰 것으로 나타났으며, 이것은 합병이라는 특정한 사건이 투기적인 성향을 보이는 소액주주들에게 단기적으로 호재로 작용했을 가능성도 상존하기 때문이라고 판단되며, 비교적 기업에 대한 정보가 부족한 소액주주들에게 합병으로 인한 시너지 효과가 발생하여 가치상승으로 이어질 것이라는 막연한 기대심리가 소액주주들의 지분이 증가한 원인으로 작용했을 수 있다. 셋째, 기존연구와 달리, 임원 지분과 같은 내부 투자자들의 지분율이 합병의 성과를 설명하는 유의한 변수로 나타났다. 이것은 코스닥시장의 규모가 유가증권시장보다 작기 때문에 소액투자자들처럼 소수임원으로도 통제가 가능하기 때문인 것으로 판단된다. 본 연구의 실증분석 결과는 전체적으로 기업합병의 성과에 기업지배구조가 일정부분 영향을 미치고 있음을 시사하고 있다. 소액투자자들이 코스닥시장 지배구조에 일정부분 영향을 미치는 결과는 기존연구와 달리 새로운 연구결과라 할 수 있다.
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.
이중 방화벽과 다중 필터링을 이용한 DDoS 차단 시스템
조지호,신지용,이극 한국융합보안학회 2014 융합보안 논문지 Vol.14 No.2
본 논문에서는 DDoS 탐지를 위해 기존의 이중 방화벽에 다중 필터링 방법을 적용한다. 1차 방화벽에서는 외부에서 유입되는 패킷 경로를 분석하여 R-PA(Router Path Anlaysis) 패킷 필터링 알고리즘과 엄격한 홉 카운터 필터링을 적 용한다. 2차 방화벽에서는 1차 방화벽을 거쳐서 온 패킷의 데이터를 검사하여 정상적인 패킷과 비정상적인 패킷을 구분 하고, 패킷 트래픽이 사용자에게 할당 된 임계치를 초과하는지를 검사하여 DDoS 공격을 차단한다.
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.