기업지배구조 연구의 고찰과 향후 국내관련 연구의 방향

박경서(Kyung Suh Park) 한국경영학회 2017 經營學硏究 Vol.46 No.3

식도 운동장애를 동반한 횡격막상부 식도 게실증 3예

박인서(In Suh Park),강진경(Jin Kyung Kain),김충배(Choong Bai Kim),박효진(Hyo Jin Park),문병수(Byung Soo Moon),이천균(Chun Kyun Lee) 대한소화기학회 1997 대한소화기학회지 Vol.29 No.5

Three patients with epiphrenic diverticula were reviewed with foci on esophageal dysfuntion and its relation to treatment. All cases were identified by bariurn esophagogram and confirmed by endoscopy. Manoetric studies of esophagus documented as diffuse esophageal spasm-like disorder in 1 case, and nonspecific motor disorder in 2 cases. One case was managed surgically, and the other 2 were treated conservatively. We found that epiphrenic diverticulum were associated with esophageal motility disorders. Treatment should be considered to focus on associated motility disorders as well as a diverticulum. (Korean J Gastroenterol 1997;29:687-693)

양성식도질환(良性食道疾患)에 대(對)한 임상적(臨床的) 고찰(考察)

박주철,노준량,김환종,서경필,이영균,Park, Joo Chul,Rho, Joon Ryang,Kim, Chong Whan,Suh, Kyung Phill,Lee, Yung-Kyoon 대한흉부심장혈관외과학회 1976 Journal of Chest Surgery (J Chest Surg) Vol.9 No.2

A clinical analysis was performed on 118 cases of the benign esophageal diseases experienced at Department of Thoracic Surgery, Seoul National University Hospital during 20 year period from 1957 to 1976. Of 118 cases of the benign esophageal diseases, there were 84 patients of esophagenal stenosis, 14 of esophageal perforation, 8 of esophageal atresia, 7 of achalasia, 2 of hiatal hernia, 2 of esophageal foreign body and one of esophageal diverticulum. Fifty-one patients were male and sixty-seven were female, and ages ranged from one day to sixty-four years with peak incidence in the age group of 20 to 29 years. All but one of the esophageal stenosis were caused by corrosive esophagitis and ages ranged from three to sixty-four years with peak incidence in third decade. Main symptoms of the esophageal stenosis were dysphagia, weight loss and chest pain in order and mostly began between one month and one year after ingestion of corrosive agents. Corrosive esophageal stenosis developed most frequently in middle one-third of the esophagus and about one-forth of them were diffuse. Operations were performed on 72 patients of esophageal stenosis of whom 26 patients had esophagocologastrostomy, 21 gastrostomy, 20 esophagogastrostomy, 4 esophagojejunogastrostomy and 2 pharyngogastrostomy. There were 5 deaths in the postoperative period, an operative mortality of 6.9 percent, and 20 patients had one or two complications; eight were anastomotic leaks, 6 gangrenes of replaced loop, 4 wound abscesses and others. The causes of the esophageal perforation were traumatic in 7 cases, caustics in 4 and spontaneous in 3, and the most frequent site of the perforation was lower one-third of the esophagus. Frequent symptoms of the esophageal perforation were pain, fever, dysphagia and dyspnea, and preoperatively there were mediastinitis in 8 cases, empyema in 7, lung abscess in 3 and others. All 14 patients of the esophageal perforation underwent operation: primary closure in 7 cases, drainage in 4, esophagogastrostomy in 2 and 'esophageal diversion in one. There were 4 postoperative deaths and 11 postoperative complications occurred in 7 patients. The duration of symptoms in achalasia was between 3 months and 25 years, with an average duration of 6. 2 years. Frequent symptoms of the achlasia esophagi were dysphagia, regurgitation, pain and weight loss in order. All 7 patients of achlasia underwent modified Heller's operation where 2 patients had complications, restenosis in one and esophageal perforation in another. All 8 patients of congenital esophageal atresia had distal tracheoesophageal fistula and were admitted within 5 days of life, but there were pneumonic consolidation on chest X-ray in patients. Five patients underwent one staged operation with the result of 2 deaths and one anastomotic leak.

개별 평가 편향 요소 경감을 통한 협업 필터링의 개선

박경화(Kyung-Wha Park),김병희(Byoung-Hee Kim),박태서(Tae-Suh Park),장병탁(Byoung-Tak Zhang) 한국정보과학회 2014 한국정보과학회 학술발표논문집 Vol.2014 No.6

폴란드 증후군 :1례 보고

박이태,홍장수,서경필,Park, I-Tae,Hong, Jang-Su,Suh, Kyung-Pill 대한흉부심장혈관외과학회 1981 Journal of Chest Surgery (J Chest Surg) Vol.14 No.1

The Poland`s syndrome is very rare anomaly, which consists of congenital unilateral absence of the sternocostal pert of the pectoralis major muscle, with ipsilateral hand deformities. The clinical features are variable but all patients have absence of at least the sternal head of the pectoralis major muscle. The syndrome is not hereditary and is of unknown origin. Early recognition of Poland`s syndrome may give the provision of psychological and genetic counseling for anxious parents. We have encountered a patient with this entity, who showed striking paradoxical movement of the left anterior Ghest wall and recurrent pneumonia, and underwent successful surgical correction.

에스자결장암에서 근치적 절제술 후 방사선 치료의 역할

박원(Won Park),성진실(Jinsil Seong),금기창(Ki Chang Keum),서창옥(Chang Ok Suh),이상욱(Sang Wook Lee),임지훈(Ji Hoon Lim),민진식(Jin Sik Min),노재경(Jae Kyung Roh),김주향(Joo Hang Kim),정현철(Hyun Cheol Chung),이강규(Kang Kyu Lee),김귀 대한방사선종양학회 1997 Radiation Oncology Journal Vol.15 No.4

목 적 : 에스자결장암으로 진단 받고 근치적 절제술이 시행된 환자를 대상으로 수술후 보조 요법으로서 방사선 치료의 역할을 평가하고자 하며, 방사선 치료를 받은 군과 받지 않은 군의 재발양상과 생존율을 비교하고, 방사선 치료를 추가함으로써 국소 제어율이나 생존율의 향상을 기대할 수 있는 요인을 분석해 보고자 하였다. 대상 및 방법 : 1988년 1월부터 1993년 12월까지 연세 의료원에서 에스자결장암이라고 진단받고 근치적 절제술을 시행받은 93례를 대상으로 하였다. 근치적 수술후 방사선 추가 여부에 따라 두 군으로 분류하였다. 에스자결장암으로 근치적 수술만 시행된 43례는 수술 단독군이라 하였고 수술후 보조 요법으로 방사선 치료가 추가된 50례는 방사선 치료군으로 분류하였다. 방사선 치료군에서 방사선 치료는 수술 후 1-2개월후부터 시작하였는데 원발 병소가 있었던 부위에 적어도 5cm의 여유를 두고 4 MV나 10 MV 선형 가속기를 이용하여 하루에 1.8Gy씩 50.4Gy-61Gy까지 조사하였다. 항암화학요법은 5-Fluorouracil을 이용하여 32례에서 시행하였는데 항암화학요법을 받은 예가 두 군간 의의있는 차이는 없었다. 결 과 : 5년 국소 제어율과 무병 생존율이 각각 85.1%, 68.5%였다. 수술 단독군과 방사선 치료군의 국소 제어율은 각각 76.2%와 91.7%였다. MAC Stage C3에서 방사선 치료군이 수술 단독군보다 국소 제어율과 무병 생존율이 높았다(P=0.01, P=0.06). MAC Stage B3에서 방사선 치료군이 수술 단독군보다 국소 제어율이 더 높았으나 통계적 의의는 없었다. 특히, 조직학적으로 원발 병소가 결장 주위를 넘어 다른 조직에 침윤이 있는 경우(Stage T4), 수술 단독군보다 방사선 치료군의 국소 제어율이 더 높았다. 결 론 : 에스자결장암에서 근치적 절제술후 MAC Stgae B3, C3 -특히, 주위 조직에 조직학적으로 침윤이 있는 경우-에서 방사선 치료를 추가함으로써 국소 제어율을 높이고, 생존율의 향상을 기대해 볼 수 있겠다. 그리고 에스자결장암에서 근치적 수술후 방사선 치료의 역할을 보다 명확하게 규명하기 위해서는 향후 전향적 연구가 필요하리라 생각된다. Purpose : To evaluate the role of postoperative radiation therapy after curative resection of sigmoid colon cancer Materials and Methods : From 1988 to 1993, a total of 93 patients with curative resectable sigmoid colon cancer of modified Astler- Coller (MAC) stage B2, B3, C2, C3 was divided into two groups on the basis of those who received radiation treatment and those who did not. Forty-three patients who treated by surgery alone were classified as postop RT (-) group. The remaining 50 patients who underwent postoperative radiotherapy were classified as postop RT (+) group. In all patients in postop RT (+) group, radiation therapy was delivered using 4 or 10 MV linear accelerators to treat the tumor bed with approximately 5cm margin to a total dose 50.4-61Gy (median 54Gy) in 1.8Gy per fraction. Thirty-two patients were treated with 5- Fluorouracil based adjuvant chemotherapy at least 3 cycles, but these was no significant difference between two groups. Treatment failure pattern, 5-year local failure-free survival rates (LFFS), and 5-year disease-free survival rates (DFS) were compared between two groups. Results : Five year LFFS and DFS were 85.1%, 68.5%, respectively. In postop RT (-) group, LFFS was 76.2%, compared with 91.7% in postop RT (+) group. Improved LFFS and DFS were seen for patients with stage C3 sigmoid colon carcinoma with postoperative radiation therapy compared with postop RT (-) group (P=0.01, P=0.06 respectively). In stage B3, LFFS was higher in postop RT (+) group than that in postop RT (-) group, although it was not significant. Especially, local control was higher in stage T4 in postop RT (+) group than that in postop RT (-) group. Conclusion : This study showed significantly improved LFFS and DFS in MAC Stage C3 and improved tendency of LFFS and DFS in MAC Stage B3 disease. Large scale prospective study is required to verify the role of adjuvant radiation therapy in resectable sigmoid colon cancer.

기업집단의 분리를 통한 기업집단의 순기능과 역기능에 관한 연구

박경서(Kyung Suh Park),정찬식(Chan Shik Jung) 한국증권학회 2011 한국증권학회지 Vol.40 No.3

본 연구는 기업집단의 계열분리 및 부실화된 기업집단의 구조조정과 이에 따른 주가반응분석을 통하여 기업집단의 다양한 기능을 실증분석하고 있다. 계열분리는 계열사간의 상호연결기능이 단절되는 사건이라는 점에서 기업집단의 기능을 분석할 수 있는 중요한 기회를 제공한다. 재무적으로 정상적인 집단에 있어 계열 분리된 기업의 특징을 살펴보면 기업집단내에서 상대적으로 기업규모가 작거나 타계열사 투자지분이 낮은 것으로 나타나 지배주주가 기업집단에 대한 통제권 확보를 위해 계열기업을 이용한다는 통제권확보 가설이 지지되는 것으로 해석된다. 계열분리 공시와 관련하여 잔존기업은 양의 누적초과수익률이 관찰되나 분리기업은 음의 누적초과수익률이 관찰되어 계열분리 이전 잔존기업으로부터 분리기업으로의 지원(propping) 또는 부의 이전(tunneling)이 이루어지고 있었던 것으로 해석된다. 특히 분리기업의 경우 지배주주 지분율이 높을수록 누적초과수익률이 더 작아 잔존 기업으로부터 분리기업으로 부의 이전이 이루어지는 사적이익추구(tunneling) 가설이 성립하였다. 또한 잔존기업은 수익성이 낮거나 설립연수가 길수록 누적초과수익률이 높은 경향을 나타내 잔존기업이 분리기업을 지원해 온 지원(propping)가설이 보다 유력하게 지지된다. 한편 부실화된 기업집단의 구조조정과 관련한 계열분리사건의 경우 내생성문제를 통제할 수 있는 추가적 장점을 갖는데, 잔존기업의 여유 현금흐름이 많고 규모가 클수록 누적초과수익률이 높은 것으로 나타나 타계열사를 지원하는 지원(propping)가설이 성립하는 것으로 보여진다. 결론적으로 본 논문은 국내 기업집단이 내부 자본시장의 형성을 통해 부의 이전(tunneling)이라는 부정적 기능 뿐만 아니라, 계열사간 지원을 통하여 시너지를 창출하는 긍정적인 기능 또한 갖고 있음을 보여주고 있다. This study analyzes the functions of Korean conglomerates based on their spin-offs. Spin-offs in a business group are events where the interactive functions among affiliated firms are disconnected, and therefore provide an opportunity to investigate the positive or negative functions of business groups. We find that spin-off firms tend to be of smaller size and have lower stock ownership of other affiliates in a group. This result supports the control right hypothesis where controlling shareholders utilize affiliated firms to secure the control over their business groups. We also find that the average cumulative abnormal return (CAR) of the remaining firms around the spinoff event is significantly positive while the average CAR of the spinoff firms is negative. This suggests that there had been propping or tunneling from remaining firms to spin-off firms before the spin-off events. We also find that the average CAR of spin-off firms tends to be lower with the controlling shareholder`s ownership. This result supports the tunneling hypothesis from remaining firms to spin-off firms. We also find that the average CAR of remaining firms tends to be higher with lower profitability or longer firm years. This results support the propping hypothesis from remaining firms to spin-off firms. We also analyze the spinoffs of the business group under financial trouble and restructuring, which provides an opportunity to control for the endogeneity issues of spin-off events. We find that the average CAR of the remaining firms increases with their free cash flows and firm sizes. This result supports the propping hypothesis again. In conclusion, these results suggest that Korean business groups have performed both a negative function of tunneling and a positive function of providing internal capital markets and creating values for their member firms.

간외담관암 절제 후 장기 생존자의 분석

박도중 ( Do Joong Park ),김선회 ( Sun Whe Kim ),박윤찬 ( Youn Chan Park ),안영준 ( Young Joon Ahn ),서경석 ( Kyung Suk Suh ),이건욱 ( Kuhn Uk Lee ),박용현 ( Yong Hyun Park ) 대한소화기학회 2002 대한소화기학회 춘계학술대회 Vol.2002 No.-

간외담관암은 조기진단이 이용하지 않고 예후도 다른 소화기암에 비하여 좋지 않은 것으로 알려져 있으나 진단기술의 발달과 적극적인 수술로 절제율과 생존율이 호전되고있다. 하지만 이에 대한 분석은 많이 이루어지지 못하였다. 〈목적〉 이에 저자들은 간외담관암의 절제 후 생존율에 영향을 미치는 예후인자를 분석하고 장기생존자의 특성을 살펴보았다. 〈방법〉 1986년 1월부터 2002년 12월까지 15년간 본원 외과에서 간외담관암으로 치료를 받은 541명의 환자를

기업M & A 시장에서의 협상게임

박경서(Kyung Suh Park) 한국경영학회 2000 經營學硏究 Vol.29 No.1

This article analyzes a bidder`s strategic choice of a takeover method in corporate control contests. It uses a bargaining game model to show that the size of the synergy of a bidder can be a key factor in the choice between a merger and a tender offer such that a bidder with high synergy prefers a tender offer while a bidder with low synergy prefers a merger. The separating equilibrium results from different bargaining structures and levels of information revelation between the two methods. The theoretical results are also found to be consistent with existing empirical observations.

터빈로터 수명예측 프로그램의 개발 및 민감도 분석

박재실,석창성,서명원,홍경태,Park, Jae-Sil,Seok, Chang-Sung,Suh, Myung-Won,Hong, Kyung-Tae 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.10

Steam turbine rotors are the most critical and highly stressed components of a steam power plant; therefore, the life expectancy of the turbine rotor is an important consideration for the safety of a steam power plant. The objective of this paper is to develop a life estimation program for turbine rotors for all possible operating conditions. For this purpose, finite element analysis was carried out for four normal operating modes (cold, warm, hot and very hot starts) using ABAQUS codes. The results are made into databases to evaluate the life expenditure for an actual operating condition. For any other possible abnormal operating condition, the operating data are transmitted to the server (workstation) through a network to carry out finite element analysis. Damage estimation is carried out by transmitting the finite element analysis results to the personal computer, and then the life expectancy is calculated.