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후방십자인대 내에 발생한 관절내 결절종 - 1례 보고 -
정재헌,백지훈,이상학,정호중,하용찬,Jeong, Jae-Heon,Baek, Ji-Hoon,Lee, Sang-Hak,Jung, Ho-Joong,Ha, Yong-Chan 대한정형외과스포츠의학회 2010 대한정형외과스포츠의학회지 Vol.9 No.1
슬관절내 결절종은 무증상에서 부터 동통, 운동장애 등의 다양한 형태의 증상으로 나타나며, 자기공명영상이 진단적 도구로 이용된 후 진단율이 높아지고 있으나, 여전히 드문 질환이다. 특히 후방십자인대 주위의 결절종은 십자인대 후방과 후방 관절막 사이에 위치하는 것이 대부분이며, 후방십자인대 내부에 위치한 예는 아직 보고된 바가 없다. 본 예는 간헐적 동통 및 굴곡 구축을 주소로 내원한 12세 환아에서 자기공명영상 검사에서 후방십자인대 내의 결절종으로 진단되어 후격막 통과 도달법으로 후방십자인대를 분열하여 낭종 제거 후 2년 추시 관찰에서 우수한 결과를 얻었기에 보고하고자 한다. Ganglionic cyst formation within the posterior cruciate ligament (PCL) of knee has not been reported. We describe a case of an intraligamentous ganglionic cyst of PCL. Arthroscopic technique through both the posteromedial and posterolateral portals was used for approach. Using probe, PCL was splitted and perforated ganglionic cyst at tibial attachement side. At 2 years follow up, the patient was free of symptoms with a full range of motion and follow-up MR image showed that there was no recurred ganglionic cyst.
YCl<sub>3</sub>-MgCl<sub>2</sub> 혼합 용융염 중 용융 Mg에 의한 Off-grade Ti 스크랩의 탈산
정재헌,이소영,박성훈,손호상,Jung, Jae-Heon,Lee, So-Yeong,Park, Sung-Hun,Sohn, Ho-Sang 한국자원리싸이클링학회 2021 資源 리싸이클링 Vol.30 No.2
Off-grade Ti generated from smelting and mechanical processing has a high oxygen content. In this work, off-grade Ti was deoxidized using Mg and a chloride mixture as the reductant and flux, respectively. The experiments were conducted in the α-Ti temperature range (1,023~1,123 K) and the effects of the reaction time, reaction temperature, quantitiy of Mg and chloride ratio on deoxidation were investigated. Notably, when YCl3 is used as the flux to react with MgO, it is possible to reduce the activity of MgO. Therefore Ti can be deoxidized using Mg. In this study, the O content was decreased from 0.5 wt% to 0.1004 wt% at 1073 K, for 6 hours, with Mg=3.6 g and $X_{YCl_3}=0.22$.
정재헌 ( Jae Heon Jung ) 한국경영공학회 2014 한국경영공학회지 Vol.19 No.1
This study analyzed efficiency of operating offices of the regional fisheries cooperatives using DEA(Data Envelopment Analysis). For efficiency analysis, we used two DEA models, One is productivity model to check the efficiency of producing loans and deposit as the result of operating financing services. The other is profitability model to evaluate the efficiency of making profit and of reducing risk of financial operation. Also, we applied the SBM DEA models with the abilities of assessing over-input and under-output for each input and output factors, to both productivity and profitability models so that we could use the results (like analyzing the course of non-efficiency for both models) for policy making for each operating offices and areas where they belongs to. As a result of the analysis, the technical efficiencies of branches located in the non capital areas or rural agricultural/fishery areas are higher than other branches in both productivity and profitability models. Also the productivity model implies that it is very difficult to improve output efficiency directly comparing it to improving input efficiency(that is, increasing output is more difficult than reducing input). This result implies the non promising future for profitabilities of the financing business.
정재헌(J.H. Jung),손예(R. Sun),노의철(E.C. Nho),김인동(I.D. Kim),김흥근(H.G. Kim),전태원(T.W. Chun) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7
This paper describes a new method for the seamless operation mode transfer of a PCS. The proposed method provides reduced STS turn off time after line fault and smooth mode change between current and voltage control of the PCS. The usefulness of the method is verified through simulations.
다이오드 클램프형 3-레벨 IGBT 인버터를 위한 과전압 방지 스너버 회로
정재헌(J.H. Jung),송웅협(W.H. Song),노의철(E.C. Nho),김인동(I.D. Kim),김흥근(H.G. Kim),전태원(T.W. Chun),유동욱(D.W. Yoo) 전력전자학회 2009 전력전자학술대회 논문집 Vol.2009 No.1
This paper proposes a new snubber circuit for a diode-clamped 3-level IGBT inverter. The voltage spike at the instant of IGBT turn-off switching can be reduced considerably by the proposed scheme. The operation of the proposed snubber circuit is described and one pole of a 3-level IGBT inverter has been implemented. The simulation and experiment was carried out with 250V dc link voltage and 20A peak load current. The usefulness of the proposed snubber circuit is verified through experimental results.
정재헌(Jaeheon Jung) 한국생산관리학회 2012 한국생산관리학회지 Vol.23 No.3
본 논문은 다수 소매점이 하나의 유통기지 또는 물류기지에서 재고를 지속적으로 보충 받는 재고관리 시스템을 다룬다. 다수 소매점들에서는 일정한 비율로 지속적인 수요가 발생하고 있으며, 이들 수요의 만족을 위해 재고를 유지하고 있다. 이들에게 재고를 보충하는 물류기지도 재고를 보유하고 있으며, 재고보충은 물류기지에서 일정 주기로 출발하는 차량을 통한 수송으로 이루어지고 있다. 우리는 재고보유 비용과 차량 수송비용을 최소화하기 위한 각 소매점 및 물류기지의 재고보충주기와 차량 수송 경로를 동시에 결정하는 문제를 다룬다. 이 문제는 재고 및 경로 문제(Inventory routing problem) 으로 널리 알려져 있다. 이 문제에 대해 본 연구는 새로운 휴리스틱 해법들을 제시하였다. 그리고 광범위한 전산실험으로 기존의 알고리즘들과의 비교를 통해 새로운 휴리스틱이 우수함을 보이고 있다. This paper considers the inventory system where multiple number of retailers have inventories to be replenished continuously from one warehouse. Retailers have continuous and constant rate of demand and keep inventories for the demand. They also keep inventory at warehouse from which the vehicles depart to replenish retailers at the pre-determined intervals. We consider the problem of minimizing both inventory holding cost for retailers and warehouse and the transportation cost simultaneously. This problem is well known as IRP (Inventory Routing Problem). We suggested new heuristic algorithm for this problem and compare this with the previously known algorithms to show the quality of our algorithm.