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- 저자 : 박희철(Hee-Chul, Park) (검색결과 97 건)
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박희철,이홍균,Park, Hee-Chul,Lee, Hong-Kyun 대한흉부심장혈관외과학회 1982 Journal of Chest Surgery (J Chest Surg) Vol.15 No.1
Fourteen cases of pericardia I tumor were clinically experienced from June 1966 to July 1981, for 15 years in St. Mary's Hospital, Department of Thoracic and Cardiovascular Surgery, Catholic Medical College. There were three primary tumors of the pericardium, liposarcoma, teratoma and malignant mesothelioma, and 11 metastatic pericardial tumors. In metastatic pericardial tumors, eight were originated from the lung, one was breast, and the other two cases were unknown origin. There were 6 adenocarcinoma, one small cell carcionoma ~nd one alveolar cell carcinoma in 8 cases from the lung, and 5 male and 3 female patients were composed the metastatic pericardial cancer from the lung. In clinical symptoms were dyspnea in all cases, and 9 cases had the generalized edema and enlarged liver size. Six patients had been operated, three of the primary pericardial tumor and three of metastatic pericardial tumor. Two of the primary tumors were cured satisfactorily by the mass removal, but one died due to cardiac arrest at postoperative one day. In metastatic tumors, operation were performed as two pericardial window formation and one left lower lobectomy with pericardial fenestration, but one was died in second operative day. Other nine metastatic tumors were diagnosed by needle biopsy in one case and by cell block of effusion in eight cases.
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박희철,박영자,Pak, Hee-Chul,Park, Young-Ja 한국수학사학회 2008 Journal for history of mathematics Vol.21 No.2
대학교육에서 다변수함수의 미분은 수리적 분석을 요하는 학문의 발전과 더불어 점차 그 중요성이 강조되고 있다. 그러나 현재 대학교양교육에서 학생들에게 도입되고 있는 다변수함수의 미분 정의는 처음 접하는 학생들에게 쉽지 않게 느껴지는 면이 있다. 이에 본 저자가 최근 몇 년간 교양수학을 가르치면서 학생들의 이해를 돕기 위해 고안한 방법이 있어 이를 소개하고자 한다. 본 저자의 경험을 토대로 한 이 방법은 다변수함수의 미분 정의에 대한 직관적이면서 기하학적인 설명법으로서 엄밀한 증명에 의한 접근 방법은 아니지만 다변수 미분의 의미를 빠르게 전달할 수 있다는 장점이 있다. It has been noticed the greater importance of mathematical education, particularly of multi-variable calculus in the undergraduate level with remarkable progress of all sorts of sciences requiring mathematical analysis. However, there was lack of variety of introducing the definition of differentiation of multi-variable functions - in fact, all of them basically rely on the chain rules. Here we will introduce a way of defining the geometrical differentiation of the multi-variable functions based upon our teaching experience. One of its merits is that it provides the geometric explanation of the differentiation of the multi-variable functions, so that it conveys the meaning of the differentiation better compared with the known methods.
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박희철(Hee Chul Park),최두호(Doo Ho Choi),안성복(Song-Vogue Ahn),강진오(Jin Oh Kang),김은석(Eun-Seog Kim),박원(Won Park),안승도(Seung Do Ahn),양대식(Dae Sik Yang),윤형근(Hyong Geun Yun),정은지(Eun Ji Chung),지의규(Eui Kyu Chie),표홍렬( 대한방사선종양학회 2008 Radiation Oncology Journal Vol.26 No.4
목 적: 본 연구는 대한방사선종양학회지 게재 논문의 통계 오류 현황을 파악하고 이에 근거한 문제 제기를 통해 학회지의 학술적 발전에 기여하고자 하였다. 대상 및 방법: 2006∼2007년 사이에 대한방사선종양학회지에 게재된 총 77편의 논문을 연구 대상으로 하였다. 각각의 논문에 적용된 통계 방법론의 적정성 평가는 통계점검표를 활용하였다. 통계점검표에는 연구의 종류, 통계기법의 사용 범위, 각 논문에 적용된 통계 기법의 종류, 통계적 기법 적용의 타당성 항목이 포함되었다. 통계 오류는 ‘생략의 잘못’과 ‘시행의 잘못’ 항목으로 나누었다. 한 논문에서 서로 다른 항목이 여러 가지 관찰된 경우 각각 횟수로 측정하였다. 같은 항목이 2회 이상 측정된 경우 1회로 횟수를 측정하였다. 통계 전문가가 개별 논문을 대상으로 통계점검표를 작성하였다. 일차 평가자가 방사선종양학 전문가가 아닌 것에서 올 수 있는 평가 오류가 있을 수 있으므로 개별 통계점검표는 간행위원회에서 한 차례 더 세부 점검을 하였다. 작성된 통계점검표의 통계 분석은 SAS (version 9.0, SAS Institute, NC, USA) 소프트웨어를 이용하였고 빈도분석을 시행하여 각 항목의 빈도와 백분율을 산출하였다. 결 과: 총 77편 중 원문을 다운로드 할 수 없었던 4편을 제외한 73편의 게재 논문을 대상으로 평가하였다. 증례보고는 5편, 원저 논문은 68편이었다. 대상 논문 중 46편의 논문에서 통계적 추론을 사용하였고, 16편의 논문에서 단순한 기술통계를 사용했으며, 11편의 논문에서는 통계적 기법을 사용하지 않았다. 추론통계를 사용한 46편의논문에서 사용된 추론통계의 횟수는 각각 분할표분석 17회(37.0%), 비교통계분석 23회(50.0%), 회귀분석 7회(15.2%), 상관분석 5회(10.9%), 생존분석이 27회(58.7%)였다. 통계 기법을 활용하여 연구 결과를 분석할 때 통계적용의 오류가 없는 논문은 19%였다. ‘생략의 잘못’은 34편(50.0%)의 논문에서 총 50회 관찰되었다. ‘시행의 잘못’은 35편(51.5%)의 논문에서 총 47회 관찰되었다. ‘생략의 잘못’과 ‘시행의 잘못’이 모두 발견된 논문은 21편 (30.9%)이었다.결 론: 대한방사선종양학회지에 게재된 논문에서 통계 분석 과정의 다양한 영역에 걸쳐 크고 작은 통계적 오류가 있음을 확인하였다. 향후 대한방사선종양학회지 투고 논문의 심사 과정에서 통계 오류에 관한 적절한 심사를 추가하는 것이 필요하다고 판단된다. Purpose: To improve the quality of the statistical analysis of papers published in the Journal of the Korean Society for Therapeutic Radiology and Oncology (JKOSTRO) by evaluating commonly encountered errors. Materials and Methods: Papers published in the JKOSTRO from January 2006 to December 2007 were reviewed for methodological and statistical validity using a modified version of Ahn’s checklist. A statistician reviewed individual papers and evaluated the list items in the checklist for each paper. To avoid the potential assessment error by the statistician who lacks expertise in the field of radiation oncology; the editorial board of the JKOSTRO reviewed each checklist for individual articles. A frequency analysis of the list items was performed using SAS (version 9.0, SAS Institute, NC, USA) software. Results: A total of 73 papers including 5 case reports and 68 original articles were reviewed. Inferential statistics was used in 46 papers. The most commonly adopted statistical methodology was a survival analysis (58.7%). Only 19% of papers were free of statistical errors. Errors of omission were encountered in 34 (50.0%) papers. Errors of commission were encountered in 35 (51.5%) papers. Twenty-one papers (30.9%) had both errors of omission and commission. Conclusion: A variety of statistical errors were encountered in papers published in the JKOSTRO. The current study suggests that a more thorough review of the statistical analysis is needed for manuscripts submitted in the JKOSTRO.
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박희철(Park, Hee-Chul),심필섭(Shim, Pill-Sub),이병철(Lee, Byung-Chul),정태홍(Jeong, Tae-Hong),류지윤(Ryu, Ji-June) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
국내 업체인 유니슨에서는 750kW Gearless형 풍력발전기, U50을 개발하였다. 개발된 풍력발전기는 대관령 풍력실증연구단지에 설치되었다. 풍력시스템의 전력품질 측정 및 평가는 계통에 대한 영향을 조사하는데 있어서 중요한 요소이다. 이 논문에서는 전력품질에 대한 국제기준인 IEC61400-21을 적용하여 U50풍력발전기의 전력품질에 대한 데이터 수집 및 수집된 데이터를 통해 U50풍력발전기가 계통에 미치는 전력품질의 영향을 검토하였다.
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방사선치료 관련 2009 간세포암종 진료 가이드라인에 대한 토의 및 설명
박희철 ( Hee Chul Park ) 대한간암학회 2010 대한간암학회지 Vol.10 No.-
According to the 2003 clinical practice guideline reported by Korean Liver Cancer Study Group (KLCSG) and National Cancer Center (NCC), Radiation therapy (RT) has been considered as alternative or complementary modality in cases where surgical resection is not possible, local treatment or trans-hepatic arterial chemo-embolization (TACE) does not provide a cure. At that time, the guideline suggested that further studies are needed to confirm the beneficial role of RT in the management of HCC because RT lacked the high quality scientific evidences at that time. However, the 2003 guideline did the pivotal role in accentuating research efforts to enlighten the role of RT in HCC management. Recently, many scientific evidences are piled up strengthening the level of evidence. Also there was the quantitative expansion of reported studies dealing with RT role in HCC management. In the 2009 Practice guidelines for the management of HCC, radiation oncologists participated as member of revision committee put every efforts to make good of RT related guideline. And to place RT related guidelines as a special feature of Korean version of HCC management guidelines. Discussions were made among radiation oncologists in the revision committee. The participating radiation oncologists realized that still there are no randomized controlled trials exploring the role of RT in HCC management. The role of RT in the management of HCC is underestimated still. To prepare the next version of practice guideline, the every effort must go on to invigorate the role of RT in the management of HCC.
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박희철 ( Hee Chul Park ) 대한간암학회 2013 대한간암학회지 Vol.13 No.2
Before the introduction of radiation therapy (RT) in the clinical management guidelines for hepatocellular carcinoma (HCC), radiation was used not very frequently in the course of HCC management. According to the "Practice guidelines for management of HCC 2009" published by the Korean Liver Cancer Study Group and the National Cancer Center, Korea, RT can be used for HCC with portal vein tumor thrombosis and can be effective to relieve the symptoms caused by HCC and its metastases once the RT is believed safe in terms of radiobiological considerations. The introduction of RT in the Korean HCC management guideline did the pivotal role in accentuating research efforts to enlighten the role of RT in HCC management. Recently, the application of stereotactic ablative body radiotherapy (SABR), an extra-cranial version of radiosurgery such as Gamma-knife, is tested as an ablative modality for HCC. There are already some published prospective series to test SABR for HCC. In Korea, there is a prospective trial published by Korea Cancer Center Hospital. A multicenter prospective trial (KROG 12-02) is on-going as a Korean Radiation Oncology Group (KROG) study and already 26 patients were accrued to the target number of 54 patients. In this review, the background, rationale and the discussion points in the application of SABR as an ablative modality for HCC will be covered. And the experience of hypofractionated ablative RT for small size HCC less than 3 cm by the author will be introduced.
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