• 대한토목학회논문집
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• 제12권4_1호
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• pp.9-21
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• 1992

논문에서는 주구조물의 기초와 부구조물의 지지점에 설치된 감진장치가 구조물의 지진응답 감소에 미치는 영향을 분석하였다. 여러가지 지진하중의 특성에 따른 감진장치가 설치된 주구조물과 부구조물의 거동을 비교분석하였으며, 이때 사용된 해석모델은 고정기초 구조물에 지지점이 고정된 부구조물, 감진기초 구조물에 지지점이 고정된 부구조물, 고정기초 구조물에 지지점 감진장치가 설치된 부구조물과 같은 세가지이다. 부구조물의 응답계산에서는 주구조물과 부구조물의 상호작용을 고려하였다. 계산에 사용한 수치적분방법은 constant average acceleration 방법이며, 이 방법과 축소행렬방법을 이용한 전산프로그램(KBISAP)을 사용하였다. 또한 지진하중에 대한 구조물의 지면에 대한 상대변위를 제한시키기 위하여 여러가지 지진하중에 대한 구조물의 가속도와 변위의 상관관계를 계산하여 감진장치의 적합한 수평강성을 분석하였다.

• 한국구조물진단유지관리공학회 논문집
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• 제11권5호
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• pp.197-211
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• 2007

노후화된 PSC Beam 교량은 개선된 보강방안이 필요하다. 본 연구에서는 성능저하가 발생된 노후 PSC Beam 교량을 대상으로 PSC Beam 교량의 보강형을 폐단면 박스형태로 변환하여 이차합성 구조화함으로써, PSC Beam 교량의 강성을 안정적으로 증가시킬 수 있는 박스형 보강방안을 제안하였다. 제안된 보강방안과 기존의 외부프리스트레스 도입공법을 결합하여 보강할 경우, 보강효과를 정량적으로 규명하기 위해 시공단계해석에 따른 시간 의존적 정밀해석을 수행하였다. 성능개선을 위해 제안된 박스형 보강방안 적용 시 보강방법에 따라 전단면 및 휨 보강과 같은 다양한 형태의 보강방안을 제시한 후, 각각의 보강방안에 대해 이차합성 효과에 따른 상향캠버 및 부재응력 특성을 평가하였다. 또한 내하력 평가를 수행하여 내하율을 검토함으로서, 개선된 PSC Beam 교량의 구조 안전성을 정량적으로 평가하였다.

• 근관절건강학회지
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• 제22권2호
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• pp.138-147
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• 2015

Purpose: The study was conducted to identify factors influence suicidal ideation among older adults with osteoarthritis. Methods: This study used a cross-sectional design with secondary analysis of the Korean National Health and Nutrition Examination Survey. Data for 174 men and 939 women who aged${\geq}65$, and were diagnosed osteoarthritis from the Korea National Health and Nutrition Examination Survey 2010~2012 were included. Suicidal idea, age, sex, education, marital status, living alone, income, body mass index, smoking and alcohol use, exercise, perceived health status, activity limitation, joint pain and stiffness, depressive mood, and perceived stress were measured. Influencing factors and odds ratios were analyzed using complex sample multivariate logistic regression. Results: In the results, 29.9% of the elderly with osteoporosis had suicidal idea. The adjusted odds ratios (ORs) of suicidal ideation were significantly higher among those over 80 years older (OR=2.88, 95% CI=1.49~5.58), those with depression (OR=4.01, 95% CI=2.66~6.04), and those with high levels of stress (OR=2.76, 95% CI=1.79~4.24). Conclusion: Therefore, older adults with osteoarthritis should be screened for depression and stress to decrease suicidal ideation and prevent suicide attempt.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2014년도 춘계학술대회 논문집
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• pp.408-414
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• 2014

After drilling operations at the offshore plant to production to crude oil to high pressure. After that time the low pressured of pipe inside when the secondary produce so oil recovery is reduced. At that time injection sea water at the pipe inside through water injection pump that the device Increase recovery so to be research and development at many industry. So developing 3-stage water injection pump at the domestic company. A variety of mathematical analysis during the detailed design analysis was not made through the dynamics characteristic. In this paper, a 2D finite element analysis is performed through the dynamics of the present study was the validation of the model.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2003년도 봄 학술발표회 논문집
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• pp.193-200
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• 2003

This paper presents a hybrid (i.e., integrated passive-active) system for seismic response control of a cable-stayed bridge. Because multiple control devices are operating, a hybrid control system could alleviate some of the restrictions and limitations that exist when each system is acting alone. Lead rubber bearings are used as passive control devices to reduce the earthquake-induced forces in the bridge and hydraulic actuators are used as active control devices to further reduce the bridge responses, especially deck displacements. In the proposed hybrid control system, a linear quadratic Gaussian control algorithm is adopted as a primary controller. In addition, a secondary bang-bang type (i.e., on-off type) controller according to the responses of lead rubber bearings is considered to increase the controller robustness. Numerical simulation results show that control performances of the hybrid control system are superior to those of the passive control system and slightly better than those of the fully active control system. Furthermore, it is verified that the hybrid control system with a bang-bang type controller is more robust for stiffness perturbation than the active controller with μ-synthesis method and there are no signs of instability in the overall system whereas the active control system with linear quadratic Gaussian algorithm shows instabilities in the perturbed system. Therefore, the proposed hybrid protective system could effectively be used to seismically excited cable-stayed bridges.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제29권3호
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• pp.227-232
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• 2007

The radial forearm fasciocutaneous flap(RFFF) is a well-known flap for the reconstruction of oral and maxillofacial defects. It was first described by Yang et al. in 1981 and Soutar et al. developed it for the reconstruction of intraoral defect. RFFF provides a reliable, thin, and pliable soft tissue/skin paddle that is amenable to sensate reconstruction. It also has a long vascular pedicle that can be anastomosed to any vessel in either the ipsilateral or contralateral neck. However, split thickness skin graft(STSG) is most commonly used to cover the donor site, and a variety of donor site complications have been reported, including delayed healing, swelling of the hand, persistent wrist stiffness, reduced hand strength, and partial loss of the graft with exposure of the forearm flexor tendon. Various methods for donor site repair in addition to STSG have been developed and practiced to minimize both functional and esthetic morbidity, such as direct closure, V-Y closure, full thickness skin graft, tissue expansion, acellular dermal graft. We got a good result of using artificial dermis($Terudermis^{(R)}$) and secondary STSG for the repair of RFFF donor site defect esthetically and report with a review of literature.

• Archives of Plastic Surgery
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• 제35권1호
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• pp.92-95
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• 2008

Purpose: Heterotopic ossification in pressure sore patients is reported to rarely develop, but once it occurs, it frequently causes joint stiffness and mobilization restriction. The aim of this article is to report our experience of atypical bone growing at femur neck fracture site with chronic, extensive pressure sore in patient with paraplegia secondary to spinal injury. Methods: A 28-year-old male patient presented with atypical bone growth at femur neck fracture site with pressure sore. He had undergone atypical growth bone removal and separation of united iliac bone and femur, and then pressure sore was covered by advanced rotation flap. Results: The patient mobilized hip joint and rode in a wheelchair. Complications such as dehiscence, infection, hematoma and flap necrosis did not occur. Conclusion: We experienced successful correction of atypical bone growth removal and recovery of pressure sore. We report our experience of atypical bone growth of fracture site and the related literature was reviewed.

• 한국자동차공학회논문집
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• 제20권2호
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• pp.47-55
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• 2012

This work deals with dynamic analysis of a monorail system with magnetic caterpillar where magnets are embedded inside each articulated element of the caterpillar, augmenting traction force of main rubber wheels to climb up slope up to 15 degree grade. Considerations are first given to determine stiffness of the primary and secondary suspension springs in order for the natural frequencies of car body and bogie associated with vertical, pitch, roll and yaw motion to be within generally accepted range of 1-2 Hz. Equations for calculating magnetic force needed to climb up given slope are derived, and a magnetic caterpillar system for 1/6 scale monorail is designed based on the derivation. To assess the hill climbing ability and cornering stability, and make sure smooth operation of the side and vertical guiding wheels which is critical for safety, a multibody model that takes into account of every component level design characteristics of car, bogie, and caterpillar is set up. Through hill climbing simulation and comparison with measurement of the limit slope, the validity of the analysis and design of the magnetic caterpillar system are demonstrated. Also by studying the curving behavior, maximum curving speed without rollover, functioning of lateral motion constraint system, the effects of geometry of guiding rails are studied.

• Steel and Composite Structures
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• 제47권3호
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• pp.315-337
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• 2023

The steel structure is an assembly of individual structural members joined together by connections. The connections are the focal point to transfer the forces which is susceptible to damage easily. It is challenging to replace the affected connection parts after an earthquake. Hence, steel plates are utilised as a structural fuse that absorbs connection forces and fails first. The objective of the present research is to develop a beam-column end plate connection with single and dual fuse and study the effect of single fuse, dual fuse and combined action of fuse and damper. In this research, seismic resilient beam-column end plate connection is developed in the form of structural fuse. The novel connection consists of one main fuse was placed horizontally and secondary fuse was placed vertically over main fuse. The specimens are fabricated with the variation in number of fuse (single and dual) and position of fuse (beam flange top and bottom). From the fabricated ten specimens five specimens were loaded monotonically and five cyclically. The experimental results are compared with Finite Element Analysis results of Arunkumar and Umamaheswari (2022). The results are critically assessed in the aspect of moment-rotation behaviour, strain in connection components, connection stiffness, energy dissipation characteristics and ductility. While comparing the performance of total five specimens, the connection with fuse exhibited superior performance than the conventional connection. An equation is proposed for the moment of resistance of end-plate connection without and with structural fuse.

• 대한관절경학회지
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• 제12권1호
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• pp.53-57
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• 2008

목적: 슬관절에 발생한 급성 화농성 관절염의 관절경적 치료 후 결과에 대하여 분석하였다. 대상 및 방법: 2000년 7월에서 2005년 1월까지 16예(15명)의 관절경적 치료를 시행한 급성 화농성 슬관절염 환자를 대상으로 하였다. 환자의 평균 나이는 61.9세였고 평균 추시 기간은 30.5개월이었다. 당뇨병이나 퇴행성 관절염 등의 기존 질환이 있었던 경우가 8예 였으며 과거력상 슬관절에 침을 맞거나 관절내 주사를 시행 받은 경우가 14예였다. 결과: 원인균의 동정이 가능했던 예는 7예(43.8%)였다. 술 후 정맥 내 항생제를 평균 25.5일 사용하였으며 경구 항생제를 평균 22.5일 사용하였다. 슬관절 강직 5예, 이차성 관절염 2예, 슬관절 주위 만성 골수염 1예, 사망 3예 등 총 11예의 합병증이 발생하였다. 수술 후 3주 이상 부목 고정을 시행한 경우 슬관절 강직이 유의하게 많았으나(p=0.032) 증상 발현 후 1 주일을 기준으로 치료까지의 기간에 따른 합병증의 발생 빈도는 차이를 보이지 않았다(p=0.293). 배양 검사 상 원인균이 동정된 경우 더 많은 합병증이 발생하였다(p=0.034). 결론: 화농성 슬관절염의 관절경적 치료 후 관절 강직의 발생 빈도와 고정 기간과 상관 관계가 있었다. 합병증 발생 빈도는 증상 후 치료까지의 기간과는 연관이 없었으나 원인균의 동정된 여부와는 연관이 있었다.