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      • KCI등재

        Outcomes of Surgical Atrial Fibrillation Ablation: The Port Access Approach vs. Median Sternotomy

        박원균,이재원,김준범,정성호,주석중,정철현 대한흉부외과학회 2012 The Korean Journal of Thoracic and Cardiovascular Vol.45 No.1

        Background: The aim of this study is to evaluate the clinical and rhythm outcomes of atrial fibrillation (AF) ablation through a port access approach compared with sternotomy in patients with AF associated with mitral valve diseases. Materials and Methods: From February 2006 through December 2009, 135 patients underwent biatrial AF ablation with a mitral operation via either a port-access approach (n=78, minimally invasive cardiac surgery [MICS] group) or a conventional sternotomy (n=57, sternotomy group). To adjust for the differences in the two groups’ baseline characteristics, a propensity score analysis was performed. Results: After adjustment, there were no significant differences in the two groups’ baseline profiles. The cardiopulmonary bypass time was significantly longer (p=0.045) in the MICS group (176.0±49.5 minutes) than the sternotomy group (150.0±51.9 minutes). There were no significant differences (p=0.31) in the two groups’ rate of reoperation for bleeding (MICS=6 vs. sternotomy=2, p=0.47) or the requirement for permanent pacing (MICS=1 vs. sternotomy=3). The major event-free survival rates at two years were 87.4±8.1% in the MICS group and 89.6±5.8% in the sternotomy group (p=0.92). Freedom from late AF at 2 years was 86.8±6.2% in the MICS group and 85.0±6.9% in the sternotomy group (p=0.86). Conclusion: Both the port-access approach and sternotomy showed tolerable clinical outcomes following biatrial AF ablation with mitral valve surgery.

      • KCI등재
      • KCI등재후보

        한·중 외교관계 변화에 따른 한·중 군사협력 증진 방안

        박원균 미래군사학회 2018 한국군사학논총 Vol.7 No.2

        This study analyzed the process of military exchange and entente, a sub-category of military cooperation through historical cases according to changes in diplomatic relations between Korea and China since the establishment of bilateral diplomatic relations in 1992. Through this, the study explored ways to promote military cooperation between the two countries. In the past, China was perceived as a communist country and also a hostile country considering its relations with North Korea. However, in the midst of changes in international political environment and materialization of global politics, Korean-Chinese military cooperation has made a lot of progress along with the development of bilateral diplomatic relations. Therefore, this study substantiated the development process by analyzing cases of Korean-Chinese diplomatic relations, military exchanges and military cooperation that have developed following China's strategic stages of partnership since the establishment of bilateral diplomatic relations in 1992. Based on the results of analysis, the study presented proposals for matters to be developed to promote bilateral military cooperation in three areas. First, military cooperation based on MOU. Second, military cooperation for joint preparation for threats and increase in confidence. Third, establishment of an organizational system for military cooperation. This study was undertaken to promote both countries’ national interests and peace on the Korean Peninsula through promotion of bilateral military cooperation. Therefore, the results of this study are expected to lay a cornerstone for the development of Korean-Chinese military cooperation that can contributes to the establishment of a peace regime on the Korean Peninsula.

      • 운동부하 및 각종 신체조건이 혈압 및 ECG에 미치는 영향 -제2보- (각종 Stress에 의한 심전도 변화)

        박원균,채의업,Park, Won-Kyun,Chae, E-Up 대한생리학회 1982 대한생리학회지 Vol.16 No.2

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        We studied this experiment to compare the effects of exercise and other body conditions: i.e., Flack test, cold pressor test and bicycle ergometry on the electrocardiogram. We had sixty healthy college students who were thirty nine men and twenty one women. Their $mean{\pm}SD$ values of physical characteristics were as follows: age; $22.0{\pm}1.4$, weight; men $61.7{\pm}5.6\;kg$, women $46.2{\pm}7.47\;kg$. We observed the changes of P-Q and Q-T interval, R and T amplitude, mean QRS vector, S-T segment deviation, and P and T vector. The result obtained were summarized as follows: P vector was shifted rightward regardless of the type of stress. T vector was shifted var-in each stress but in the bicycle ergometry T vector was shifted leftward. Mean QRS vector was shifted rightward immediately after the bicycle ergometry. Percentage of the occurrence of the depression of S-T segment was 21.7% at the immediately after the submaximal bicycle ergometry in lead II. The elevation of S-T segment was often observed after the mild stresses. Increased amplitude of T wave in the cold pressor test and decreased amplitude of T wave in the bicycle ergometry were observed. In the bicycle ergometry and other stresses, the precise mechanism of S-T segment changes was unexplained but insufficient repolarization in base or apex of the left ventricle due to heart strain was indicated by so called S-T vector analysis.

      • 비강폐쇄가 백서의 안면두개골 성장에 미치는 영향에 대한 실험적 연구

        박원균,이기수 慶熙大學校 齒科大學 1989 慶熙齒大論文集 Vol.11 No.-

        The purpose of this study was to investigate the effects of induced nasal obstruction on the craniofacial skeleton of the growing rats. Minty five Sprague-Dawley rats of four weeks of age were divided into three groups of which the first group got the one naris occluded, the second group was on both nares occluded, and the third served the control. The experimental animals were sacrified 2, 5, 8, 12 weeks after occlusion of nasal airway by means of electrocauterization followed by preparation of dry skulls, measurements, and statistical analyses. The findings were as follows 1. The body weight increments in two nasal obstruction groups were significantly lower than the control group 2 The bilaterally occluded group showed the smallest size in the magnitide of craniofacial skeleton, then unilateral occluded group and control group in order . 3. The dimensional difference in craniofacial skeleton between experimental and control groups were the most outstanding at 5 weeks of experiment in length, and 8 weeks. of experiment in width. 4. In spite of various significant dimensional differences among the groups, no distinct description upon the interrelation between the oral respiration and its impact on the craniofacial growth could be drawn in the very experimental design.

      • KCI등재

        의학교육기관의 학생연구: 왜 우리는 학생연구를 말하는가?

        박원균,Park, Won Kyun 연세대학교 의과대학 2015 의학교육논단 Vol.17 No.2

        Student research has been proposed as an educational strategy to fulfill the current requirements in basic medical education (BME) and to compatible with the self-directed development of professionalism. It is commonly accepted that the goals of student research are to develop the competencies of critical, reflective, and self-directed thinking; problem-solving; and creativity; as well as to acquire the skills necessary to search for information and analyze the literature; to cultivate the talent of mastering a specialized field through deeply intensified learning; and to establish close relationships between students and supervisors. To successfully implement student research, authorities on BME should to plan the procedure for the student research projects and allocate personal and material resources adequately in order to provide the opportunity for self-evaluation and reflection through the completion of daily records, to develop the habit of consistently evaluating one's own study, and to maintain a collegial relationship between students and supervisors by offering the proper feedbacks in a timely and consistent manner. In conclusion, despite several obstacles and difficulties in the establishment of successful student research projects, student research could provide students the motivation to develop themselves into expert academic researchers, and play a role in educating students to help solve patients' problems based on scientific evidence in the future.

      • KCI등재

        Cardiac Angiosarcoma on the Right Atrium: Two Cases

        박원균,정성호,임주영 대한흉부외과학회 2012 The Korean Journal of Thoracic and Cardiovascular Vol.45 No.2

        We detected two cases of right atrial angiosarcoma that had a similar appearance on imaging studies. Although the surgical findings were similar for the two patients, one had a clear resection margin, while the other had tumor cells in the resection margin on frozen biopsy. We suggest that preoperative data on magnetic resonance imaging and computed tomography in patients with angiosarcomas may not predict the exact extent of surgical resection or prognostic outcomes.

      • KCI등재
      • 수동적 체위변동과 경사도에 따른 혈력학적 반응

        채의업,송대규,서영성,박원균 啓明大學校 醫科大學 1992 啓明醫大論文集 Vol.11 No.2

        The purpose of this study was to investigate the relationship between the effects of gravity and regulatory mechanisms of the cardiovascular system by obwerving hemodynamic responses to passive body tilts. The study was carried out in 12 healthy young adult males. The postural changes were passively tilted from the supine control position(SCP) to the 15˚, 30˚ and 60˚ head-up position(HU), and then the 30˚ and 15˚ head-down position(HD) using a tilting table, and lasted for 5 minutes in each grade of the tilted position. Cardiac output(Q), stroke volume(SV), acceleration index(ACI) of the heart, and thoracic electrical bioimpedance were measured by the impedance cardiograph. Thoracic fluid volume(TFV) changes were calculated by the principle of impedance plethysmography. In addition, blood pressure(BP), heart rate(HR), total systemic vascular resistance(R), and ECG were measured. In the postural changes from supine to the 15˚, 30˚ and 60˚ HU, the SV gradually decresaed(p<0.01) by 11%, 26% and 42%, and the Q also decreased by 10%(p<0.05), 19% and 24%(p<0.01) respectively as compared with SCP. However, The HR and R gradually increased. On the contrary, in the postural changes from supine to the 30˚ and 15˚ HD, the SV increased by 16% and 14%, and the Q increased by 12% and 11% respectively and the HR and R decreased. The ACI increased in the HD, but decreased in the HU with the increasing fraction of the tilting degree. There was no significant change in the systolic BP, and the mean BP and diastolic BP gradually increased proportionally to the tilting degree in the HU, but they decreased in the HD. The TFV gradually increased in the HD, and it decreased in the HU. The average electrical axis of QRS complex on ECG was 56.1˚ in the SCP and it increased in the HU, however it decreased in the HD. In general, it is speculated that changes of hemodynamic variables on the effect of gravity were positively related to the tilting degree. From the above results, it may be suggested that the cardiopulmonary baroreceptors reduce R and HR to maintain BP against the increase of central blood volume. It may be also suggested that, as the tilting degree increases in the HU, both the arterial baroreceptors and cardiopulmonary baroreceptors are involved in the regulatory mechanisms. It can ve said that changes of the SV of the heart are related to Frank-Staring's law according to the venous return. In spite of the possibility of the fact that the atrial baroreceptors may increase the HR by the Bainbridge reflex in consequence of atrial distention in the HD, however, the negative chronotropic effect through cardiopulmonary baroreceptors appeared to be predominant. This study provides enidence that the extent of the cardiovascular regulation is proportional to the effects of gravity that is demonstrated by the magnitude of hydrostatic pressure according to the tilting degree.

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