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이동 질량 효과를 고려한 연속 보의 보행하중 진동 유한요소 해석
박원석,Park, Wonsuk 한국전산구조공학회 2022 한국전산구조공학회논문집 Vol.35 No.5
이 논문에서는 이동하는 질량체의 연직 방향에 대한 관성 효과를 고려하여 보의 진동을 해석할 수 있는 유한요소해석 방법을 제안한다. 제안하는 방법은 정밀한 상호작용 해석을 요하지 않는 경우에 계산의 효율성을 높이는 방법으로서, 이동하는 질량체의 관성 효과를 운동방정식에 연계시키고 질량체와 보의 상호작용력은 외부 하중으로만 고려한다. 범용 유한요소해석 소프트웨어인 Abaqus를 이용하여 시간 영역 해석을 수행하고 보의 절점과 이동하는 강체 질량의 절점 변위를 다지점 구속조건으로 연계하여 해석하는 방법을 제시하였다. 기존 해석적 방법에 의한 해와 비교하여 제안하는 방법을 검증하고 보행하중 모델을 이용한 이동 보행 하중해석에서 보행자의 질량 효과를 살펴보기 위한 간단한 연속 보 모델에 대한 해석 결과를 제시하였다. This study proposes a finite element analysis method that can analyze the vibration of a beam by considering the inertia effect of moving masses in a vertical direction. The proposed method is effective when a precise interaction analysis is not required. The inertial effects of the moving masses are included in the equation of motion, and the interaction forces between the masses and the beam are considered only as external loads. Time domain analyses were performed using Abaqus, a general-purpose finite element analysis software, and an implementation method using multi-point constraints wais presented to link the displacements of the beam element nodes and moving rigid masses. The proposed method was verified by comparing its solution with that obtained using an existing analytical method, and the analysis results for continuous beam vibrations under dynamic gait loadings were used to examine the mass effect of pedestrians.
아킬레스건 파열의 세 가지 수술적 치료법의 임상 결과에 대한 비교: 관혈적 봉합술, 경피적 봉합술, 아킬론을 이용한 최소절개 봉합술
박원석,이명진,강정모,이승엽,Park, Won Seok,Lee, Myoung Jin,Kang, Jung Mo,Lee, Seung Yup 대한족부족관절학회 2018 대한족부족관절학회지 Vol.22 No.2
Purpose: This study compared the clinical outcomes of open repair, percutaneous repair, and minimal incision repair by Achillon in ruptured Achilles tendon. Materials and Methods: The outcomes of 12 patients with open repair (group 1), 8 patients with percutaneous repair (group 2), and 10 patients with minimal incision repair by Achillon (group 3) from February 2013 to March 2016 were analyzed retrospectively. The postoperative clinical evaluations were done by the American Orthopaedic Foot and Ankle Society (AOFAS) ankle-hindfoot score, Arner-Linholm scale, mid-calf circumference difference, one-leg heel raise difference, visual analogue scale (VAS) for postoperative scarring, time to return to work, and complications. Results: No significant difference in the AOFAS ankle-hindfoot score, Arner-Linholm scale, and time to return to work was observed among three groups (p=0.968, 0.509, and 0.585). The mean differences in the mid-calf circumference in groups 1, 2, and 3 were 1.09, 0.73, and 0.58, respectively; groups 2 and 3 were significantly higher than group 1 (p=0.002). In addition, the mean VAS scores for postoperative scarring in groups 1, 2, and 3 were 7.0, 9.1, and 9.1, respectively; groups 2 and 3 were significantly higher than group 1 (p=0.001). The mean differences in one-leg heel raising in groups 1, 2, and 3 were 2.03, 1.91, and 1.33, respectively; group 3 was significantly higher than groups 1 and 2 (p=0.010). The complications encountered were one case of deep infection in group 1 and one case of sural nerve hypoesthesia in group 2. Conclusion: Minimal incision repair by Achillon is recommended as an effective surgical treatment for Achilles tendon rupture because it minimizes the risk of complications, leads to an improved tendon strength and healing, and achieves cosmetic satisfaction.
군사용 방사선 계측기 PDR-1K 반응도 평가 : 방향 및 에너지 의존성을 중심으로
박원석,최준혁,정도영,김장오,민병인,Park, Wonseok,Choi, Junhyuk,Jung, Doyoung,Kim, Jango,Min, Byungin 한국군사과학기술학회 2017 한국군사과학기술학회지 Vol.20 No.2
In this paper, we performed a evaluation for angular and energy dependence of military radiation detector PDR-1K. Its measuring range is divided into two section, low and high, and each range has a GM tube separately owing to broad scale. We observed a change in relative angular reactivity within 0.928 ~ 1.188 in low range and within 0.743 ~ 1.000 in high range from $-90^{\circ}$ to $+90^{\circ}$. The evaluation for energy dependence appeared a relative reactivity within 0.892 ~ 1.000 above 83 keV. This means PDR-1K isn't possible to use below 83 keV of radiation energy. It is possible to provide response information to user and to increase reliability of radiation measurement through this paper.
이동 질량 효과를 고려한 단경간 강합성 보행교의 보행 하중 진동 사용성 평가
박원석,Wonsuk Park 한국전산구조공학회 2023 전산구조공학 Vol.36 No.2
In this paper, we present the analysis results on the vibration serviceability of a pedestrian bridge considering the effect of pedestrian moving mass inertia. Using dynamic finite element analysis, we considered different walking scenarios, including pedestrian density, walking speed, random walking, and synchronized walking, to analyze the acceleration response of a 40m long single-span bridge with a steel composite box cross section. We showed that the equivalent fixed mass analysis method did not significantly differ from the moving mass analysis in the random walk scenario and a wider frequency excitation band may be useful to consider when evaluating vibration serviceability in a random walk scenario.
박원석(Won Seok Park),황성하(Sung Ha Hwang),박용현(Yong Hyun Park),박주현(Joo Hyun Park),진동찬(Dong Chan Jin),김혜수(Hye Soo Kim),이종민(Jong Min Lee),이은희(Eun Hee Lee),김석영(Suk Young Kim),방병기(Byung Kee Bang) 대한신장학회 2001 Kidney Research and Clinical Practice Vol.20 No.5
Metanephric adenoma is a very rare benign renal tumor; only 100 well-documented cases have been reported to date. Metanephric adenoma occurs at all ages, most commonly in the fifth and sixth decades. There is a 2 : 1 female preponderance. They appear to be benign tumors with no malignant potential, and their chief importance is related to the fact that they are most often misinterpreted as renal cell carcinoma or Wilms' tumor. Its light microscopic features are very characteristic, and imunohistochemical and electron microscopic studies are not critical to the diagnosis. We have experienced a case of renal tumor in a 44-year-old female patient diagnosed by ultrasonography-guided needle biopsy which showed small, tightly packed acini or tubular and papillary structures. The patient underwent right nephrectomy. We report metanephric adenoma diagnosed by ultrasonography-guided needle biopsy, which is a very rare and unique case.
박원석 ( Won Seog Park ) 연세대학교 법학연구원 2009 法學硏究 Vol.19 No.2
Uzbekistan enacted the Law on Product Sharing Agreement(hereinafter, PSA) in 2001 to provide the legal foundations for the relations arising in the process of the conclusion, execution and termination of production-sharing agreements relating to the exploration for deposits and production of mineral products in the territory of Uzbekistan. The PSA is a contract according to which Uzbekistan grants to a foreign investor, on a compensation basis and for a certain period, exclusive rights to a specified subsurface area for the exploration of deposits and the production of mineral products and for related operations. In the meantime, the investor bear all expenses and risks which carrying out the specified operations. This Law was primarily intended to attract foreign direct investment, on a production-sharing-basis, in the exploitation of subsurface areas of unconfirmed values and requiring extensive financial resources and advanced technology and machinery for prospecting operations. Subsurface areas with proven mineral deposits can be granted in the limited conditions such as absence of the financial and technical means necessary for the exploitation of the confirmed large scale mineral deposits, construction of the structures required for their transportation, attraction of advanced technological processes for the exploitation of deposits, the stable economic development of the country, ect. This Law sets forth the procedures and conditions for the granting of the subsurface areas to the investor; the rights and responsibilities for the parties and the bodies established for the joint monitoring of the implementation of the PSA; terms of operations, development of work programs and budgets; accounting and reporting procedures; conditions for taxation and the payment of other tariffs; expense compensation procedures and the terms for production sharing; procedures for the export of investors` production share; the independence of the investor in the matter of product pricing for its share; control procedures over the PSA implementation; dispute resolution procedures; PSA termination procedures, etc.