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박원서,이제호,박혁,정호걸,김기덕,Park, Won-Se,Lee, Je-Ho,Park, Hyok,Jung, Ho-Gul,Kim, Kee-Deog 대한영상치의학회 2010 Imaging Science in Dentistry Vol.40 No.2
Impaction of tooth is a situation in which an unerupted tooth is wedged against another tooth or teeth or otherwise located so that it cannot erupt normally. The supernumerary tooth is also called as hyperdontia and defined as the condition of having additional tooth to the regular number of teeth. The most common supernumerary tooth is a mesiodens, which is a mal-formed, peg-like tooth that occurs between the maxillary incisors. The supernumerary tooth is commonly impacted but they are frequently impacted on maxilla. Ectopic impaction of supernumerary tooth on mandibular condyle, coronoid process, ascending ramus, and pterygomandibular space is very rare condition. In this case, we report a case of impacted supernumerary tooth on mandibular sigmoid notch without definite pathologic change.
Mandibular metastasis of cholangiocarcinoma: A case report
유태민,김기덕,정호걸,박원서 대한영상치의학회 2015 Imaging Science in Dentistry Vol.45 No.4
Tumors metastasizing from distant regions to the oral and maxillofacial region are uncommon, comprising only 1%–2% of all malignancies. Cholangiocarcinoma is a malignancy that arises from cholangiocytes, which are epithelial cells that line the bile ducts. These cancers are difficult to diagnose and have a poor prognosis. In this paper, we report a rare case of mandibular metastasis of cholangiocarcinoma diagnosed at the primary site and discuss the radiographic findings observed in this case.
Propofol 과 Enflurane 마취시 혈중 Catecholamine 농도 및 심혈관계 반응의 비교
김용일,임경준,기삼서,정원서,소금영,정종달 대한마취과학회 1996 Korean Journal of Anesthesiology Vol.31 No.2
Background: Surgical trauma is a potent stimulus for the neurohormonal axis. The catecholamine response to surgical stress may be modulated by the anesthetic regimen utilized. We compared the hemodynamic response and cateeholamine concentration to lower abdominal surgery during anesthesia with propofol or enflurane. Methods: Forty six patients undergoing lower abdominal surgery were assigned randomly to two groups. In group I, anesthesia was induced with thiopental sodium 5.0mg/kg and maintained with enflurane-N₂O. In group II, anesthesia was induced with propofol 2.0mg/kg and maintained with propofol 12mg/kg/min by infusion pump. Hemodynamic responeses were recorded at tracheal intubation. Blood samples for later determination of plasma catecholamine were drawn and hemodynamic responses were recorded at preinduction, 1 minute after skin incision, 30minutes after skin incision. Results: There was no statistical significance in systolic and diastolic pressure between two groups. There was statistical significnce in heart rate 30minutes after skin incision between two groups. There was no statistical significance in epineprine concentration between two groups. There was statistical significance in norepineprine 30 minutes after skin incision between two groups. Conclusion: Propofol may be useful alternative at lower abdominal surgery and it may be convenient and safe intravenous anesthetics.
경골 근위부 골채취를 위한 내측 및 외측 접근법시의 삼차원적 길이계측
남웅(Woong Nam),박원서(Won-Se Park),정호걸(Ho-Gul Jeong),허경석(Kyung-Seok Hu),차인호(In-Ho Cha) 대한구강악안면외과학회 2007 대한구강악안면외과학회지 Vol.33 No.4
Purpose : The aim of this study was simply assessing linear measurements in the lateral and medial approach, respectively, for bone harvesting using anatomic and three-dimensional (3D) computed tomographic (CT) analyses on a dried cadaveric proximal tibia. In addition, the availability of the three-dimensional computed tomographic (3D-CT) analysis was also estimated. Materials and methods : Ten dried proximal tibia were obtained from five Korean cadavers. Four the reference points, the SM (superior-medial), IM (inferior-medial), SL (superior-lateral), and IL (inferior-lateral) were marked around the tibial tuberosity. The PM (posterior-medial) and PL (posterior-lateral) points were randomly marked at points farthest from the lateral and medial reference points, respectively, in the posterior border of the superior articular surface of both condyles. All measurements were obtained on the dried proximal tibia. After computed tomography had been performed, the three dimensional images were reconstructed using V works 4.0™ (Cybermed Inc., Seoul, Korea), and the length between the reference points were measured three dimensionally using the method described above. The error between the mean actual and mean 3D-CT measurements was calculated in order to determine the availability of the three dimensional computed tomographic analysis. Results : The length between the reference points was greatest at the IL-PM, which averaged 65.39 mm±10.35. This was followed by the SL-PM with 63.24 mm±8.10, the IM-PL with 58.09 mm±10.02, and the SM-PL with 51.99 mm±9.06. The differences between the IL-PM and SM-PL were 13.4 mm. The mean values were 55.04 mm in the medial approach and 64.32 mm in the lateral approach, and the differences between medial and lateral were 9.28 mm. The error between the mean actual and mean 3D-CT measurements was 0.31% and the standard deviation was 0.28%. Conclusion : The anatomical and three dimensional computed tomographic analysis indicates that there was only a 9.28 mm linear difference between the lateral and medial approach. This is consistent with previous studies, which showed that there was little difference between the two approaches in terms of the bone volume. In addition, the error (0.31%) and the standard deviation (0.28%) were considered low, demonstrating high accuracy of 3D-CT. Therefore it can be used in preoperative treatment planning.
민재형(Jea-Hyung Min),정원서(Won-Sir Chung) 한국생산관리학회 2004 韓國生産管理學會誌 Vol.15 No.2
조직의 성과측정관행은 그들이 이용하고 있는 성과측정시스템과 성과관리시스템의 함수로서 첫째, 조직이 올바른 것을 측정하고 있는가, 둘째, 조직의 성과측정은 올바르게 수행되고 있는가, 셋째, 측정결과의 수집, 구조화, 분석, 해석, 전파할동이 활성화되고 있는가를 종합적으로 평가함으로써 그 수준이 결정된다. 본 연구에서는 항공사의 성과측정관행을 진단할 수 있는 분석적인 틀을 제안하고, 구조화된 설문지를 이용하여 사례 대상 기업의 성과 측정의 질과 성과관리의 질을 탐색적으로 진단하였다. 본 연구의 결과는 해당 항공사가 자신들의 성과지표를 수정할 수 있다록 하는 동시에 자신들의 성과측정관행을 운영관리를 위해서 뿐만 아니라 전략적 관리라는 성과 측정의 순 목적에 부합되도록 개선할 수 있는 근거 자료로서의 역할을 할 수 있는 유용성이 있다. 또한 본 연구에서 논의된 성과 측정관행의 진단 방법은 다른 산업에도 쉽게 적용될 수 있는 유연성도 갖고 있다. In this study, we suggest an analytic framework diagnosing organizations'pdorformance measurement practices, whose level of quality is determinde by auditing the quality of their respective performance measurement and management systems. To apply the framework to airline industry, we design a structured questionnaire to survey the employees' perception of a specific firm's current measurement practices Performing detailed analyses from various view points, we provide a clue to reveal the problems in their surrent practices and suggest managerial implications to improve the overall quality of their measurement practices.