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교통사고 이후 디스크 탈출이 없이 상지 저림을 호소하는 환자의 경추 측굴과 상지 저림에 관한 연구
박현민,박지용,김동섭,김은수,김미령,조남훈,정훈,성익현,김민우,홍남중,하인혁,이진호,Park, Hyun-Min,Park, Ji-Yong,Kim, Dong-Sub,Kim, Eun-Soo,Kim, Mi-Riong,Cho, Nam-Hoon,Jeong, Hoon,Seong, Ik-Hyun,Kim, Min-Woo,Hong, Nam-Jung,Ha, In-Hyuk,Le 척추신경추나의학회 2013 척추신경추나의학회지 Vol.8 No.2
Objectives : The purpose of this study is to investigate the relation between cervical spine lateroflexion and upper limb numbness after whiplash injury by traffic accident. Methods : Outpatients who visited Jaseng korean medicine hospital after traffic accident took cervical MRI. Patients who had Normal disc and bulging disc were reviewed to measure the cervical lateroflexion by C2-C7 Cobb's angle & scalenus muscle's length through neutrality AP X-ray views. For statistics, we used SPSS version 18.0 for windows. Results : Groups classified into difference of scalenus muscle's length were showen statistical significance than into cobb's angle. Means of numbness group's length difference are $4.18{\pm}2.26mm$ and that of non-numbness group is $1.59{\pm}1.17mm$. Unilateral numbness group had greater angle and longer of length's difference than non-numbness group. Conclusions : The more severe the lateroflexion of the upper extremity numbness occurs well. Group classifed into difference of scalenus muscle's length has more tendency of occurrence of upper limb numbness than that into cobb's angle. And upper limb numbness occurs more frequently at the same direction of lateroflexion.
박현민(Hyun Min Park) 한국구강보건과학회 2013 한국구강보건과학회지 Vol.1 No.1
The purpose of this study is to investigate influencing factors for selecting dental care institutions, and to suggest implications to develop differentiating strategies for each level of institutions. Data were collected from 334 customers of three level of dental institutions, dental clinic, dental hospital, and dental department in university hospital, located in Busan using structured self - administered questionnaire. The collected data were analyzed with SPSS 12.0 program. Major result of the analysis is as follows : First, medical service among selecting factors has been found to be a significant affecting factor on customer satisfaction only in dental hospitals among three level of dental institutions. Second, the effects of selecting and customer satisfaction factors on re-visit and by word of mouth effect is varied according to level of dental institutions. In terms of re-visit intention, customer satisfaction in dental clinic and dental department of university hospitals, and customer satisfaction and medical service factor in dental hospital are found to be significant affecting factors. Above result imply that customer relationship strategy based on customer attributes must be sought to improve customer loyalty and suitable marketing and competitive strategies for each level of dental institution is needed.
박현민(Park, Hyun-Min),권대중(Kwon, Dae-Jung) 대한부동산학회 2014 大韓不動産學會誌 Vol.32 No.1
본 연구는 많은 사람들의 관심의 대상이 되고 있는 준공공임대주택제도에 대하여 투자인식조사를 하였다 그 결과 첫째, 준공공임대주택에 대한 충분한 홍보가 있어야 한다. 둘째, 준공공임대주택 활성화를 위해서는 임대의무기간을 낮춰야 한다. 셋째, 준공공임대주택 활성화를 위해서는 월세 상한률을 탄력적으로 규제해야 한다. 넷째, 준공공임대 주택 활성화를 위해서는 장기보유특별공제율을 늘려야 한다. 이상과 같이 준공공임대주택에 대한 투자인식조사를 통하여 정부가 시행하고 있는 본 제도를 활성화시키기 위해서는 보다 적극적인 보완대책이 필요함을 알 수 있었다. tention from many people. As a result, the following conclusion could be drawn: First, it is necessary to publicize quasi-public rental housing sufficiently. Second, it is necessary to lower the period of obligatory lease to revitalize quasi-public rental housing. Third, it is necessary to put restriction on the ceiling on monthly rent to revitalize quasi-public rental housing in an elastic way. Fourth, the rate of special deduction for long-term holding should be raised to revitalize quasi-public rental housing. It could be found that it would be necessary to take a more active complemental measure to revitalize this system implemented by government through the consciousness survey of investment in quasi-public rental housing.
박현민(Hyun-Min Park),박창용(Chang Yong Park) 한국생산제조학회 2013 한국생산제조학회지 Vol.22 No.3-1
The heat transfer performance and pressure drop characteristics of brazed-plate heat exchangers with 20 and 30 plates were experimentally measured and analyzed in this study. The mass flow rates of the heat exchangers with 20 and 30 plates were fixed at 0.6 and 0.9 kg/s for the low temperature side, respectively. The mass flow rate for the high temperature side was controlled from 0.2 kg/s to 1.2 kg/s. The inlet temperatures for the high and low temperature sides were 10℃ and 7℃, respectively. The heat transfer characteristics were not influenced by the number of plates. The pressure drop at the heat exchanger with 30 plates was slightly higher than that with 20 plates. The values calculated from the correlations based on gasket plate heat exchangers were compared with the experimental results. It was found that the predicted Nusselt numbers for the gasket plate heat exchangers were about 5% to 20% lower than the measured Nusselt numbers for the brazed plate heat exchangers. However, a pressure drop comparison showed that the calculated pressure drops at the gasket plate heat exchangers were less than half of the measured pressure drops at the brazed plate heat exchangers.
다양한 형상을 가지는 Wave perfobond rib 전단연결재의 전단강도 평가
박현민 ( Park Hyun-min ),최규태 ( Choi Kyu-tae ),안진희 ( Ahn Jin-hee ),김상효 ( Kim Sang-hyo ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.2
This paper deals with the shear capacity of wave perfobond rib as the shear connector in composite structures. Wave rib is modified as perfobond rib shear connector type to evaluate the shear capacity. A total 11 push-out specimens with perfobond rib and wave perfobond rib connector were fabricated. Then, the influences of hole-crossing bars, concrete dowel, depth of wave shape and diameter of wave rib on the shear capacity were evaluated experimentally. As result the shear capacity of corrugated rib specimens improved as high to 51% compared to the perfobond rib shear connectors. Also, the hole-crossing bars were effective on the improvement of concrete dowel action and consequently, shear capacity increased by 31%.
이산시간 2단계 서비스 대기행렬을 이용한 로드밸런싱 프로세스 설계
박현민 ( Hyun Min Park ) 한국생산성학회 2013 生産性論集 Vol.27 No.4
This paper introduces a new load balancing algorithm and a method of estimating the performance of the load balancer in a network composed of a multi-server sharing the entire load such as cloud computing. A load balancer collects newly arrived traffic in batches and distributes the batches sequentially. A discrete-time Geo/G/1 queueing model having a heterogeneous two-phase service mode with a fixed-size batch is applied for designing the optimal load balancing rule. The stationary queue length and regeneration cycle length are derived so that the long-run average cost function of a load balancer could be analyzed. A numerical example also illustrates the process of finding the optimal threshold value that minimizes the work load of a load balancer.
물류센터 리드타임 관리를 위한 배송 작업 대기시간 분석-대기행렬모형을 중심으로-
박현민 ( Hyun Min Park ),이규창 ( Gyou Chang Lee ),손진현 ( Jin Hyeon Sohn ) 한국물류학회 2014 물류학회지 Vol.24 No.4
본 연구는 발주 요청에 따라 재고 품목을 소비자에게 배송하는 물류센터의 리드타임을 분석한다. 물류센터내의 리드타임은 재고 물품의 분류와 포장, 선적에 필요한 작업시간과 대기시간으로 이루어진다. 그런데 배송 요청이 몰리는 경우 리드타임 중에서 대기시간이 차지하는 비중이 크다. 그리고 배송 준비 작업을 위한 서버는 작업준비시간과 서버종료시간을 두고 있으며, 유지보수 또는 다른 작업을 위한 휴가기간을 갖는다고 가정한다. 이러한 물류센터의 운영 상황을 고객의 도착과 이에 대한 서비스 제공으로 표현하는 대기행렬시스템으로 모델링 한다. 특히 복수 개의 발주 품목에 대한 배송 요청이 포아송 프로세스로 발생한다고 가정하고, 제한된 횟수의 복수 휴가와 작업준비 및 종료시간을 갖는 Mx/G/1 대기행렬의 평균 대기시간을 분석한다. 수치 예제를 통해 휴가기간과 주문 도착률에 따른 대기시간의 변화 패턴을 분석한다. This study presents a lead time analysis for logistics centers that ship items from inventory to consumers. "Lead time" consists of waiting time and service time of sorting, packaging and shipment. Also, servers that prepare shipments need setup time and closedown time for maintenance or other operations. In this paper, we describe the operation process of a logistics center using a queueing inventory model. We assume that orders for the release of items from inventory at a logistics center occur via a compound Poisson process. We formulate an Mx/G/1 multiple adaptive vacation queueing system with setup and closedown time. We analyze the queueing model and derive the mean waiting time using the arrival time approach and the property of stochastic decomposition. Finally, we obtain some numerical examples that indicate the effect of the limited number of multiple vacations on the mean waiting time.