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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(Jaeheon Jung) 한국경영과학회 2009 한국경영과학회지 Vol.34 No.2
Total profit level increases if a company increase the cost for achieving R&D related goals of equipment productivity enhancement, production cost saving, or for achieving equipment scale target, sales volume goal. But how much money should be invested to achieve a certain level of profit? We formulated the model to set the optimal goal levels to minimize the investment cost under the constraint that certain level of total profit should be guaranteed. This model derived from a case of P steel company. We found that this should be considered in relation with the production sales planning (known as optimal product mix problem) to guarantee the profit. We suggested a nonlinear programming model, a variant form of the product mix problem. We can find the optimal investment level for the R&D related goals or sales volume goal, equipment scale target for the P steel company using the model.
정재헌(Jaeheon Jung) 한국산업경영시스템학회 2013 한국산업경영시스템학회지 Vol.36 No.1
This study analyzed the efficiencies of Korean fisheries cooperative's 97 operation offices in the capital and surrounding area. We used the DEA model for checking the technical and scale efficiencies in the financial business of them. We divided the business into two parts, the productivity (efficiency for increasing deposit and loan) and profitability (efficiency for increasing the profit and reducing the risk from the loan). The results show that the additional profitability increase is very difficult because most of the offices have full technical efficiency for profitability. But additional analysis based on Slack-based Measure (SBM) DEA model shows that Kyung-Gi region can increase the profitability. SBM model analysis also gives us the possibility that customized policy can apply to each offices considering each factors affecting the productivity and profitability.
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.