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조창현,Tom Bellemans,조창현,최기주 대한교통학회 2017 대한교통학회지 Vol.35 No.6
This study aims to evaluate the availability of ABM (Active-Based Model), FEATHERS, as a policy evaluation tool. To achieve the goal, scenario analysis on flexible working policy was conducted to measure its impact on activity-travel behavior. As a consequence, there seems no significant change in worker's daily life, other than mitigating traffic congestion due to decreasing commuting travel in the rush hour. The result of VKT (vehicle kilometers traveled) shows an opposite pattern according to given household/individual constraints. The scenario analysis on telecommuting indicates a decreasing trend in both travel frequency and distance because of the diminished number of commuting trips. As the activity space of telecommuters is shifted to a residential area, there are more short-distance trips by using non-motorized transport, which leads to decrease in VKT (using a private vehicle). Thus, the sensitivity of VKT by population groups varies due to transport mode shift (between personal and another mode) and growing non-work trips (using a private mode). This study found few things. First, it is necessary to evaluate the details of policy impact by population groups since it can be varied depending on household/individual characteristics. Second, the case study shows a promising performance of ABM as policy measurement that provides reality in policy evaluation. Third, ABM allows us to do more accurate analysis (i.e. time-series analysis by population groups) of policy assessment than those of FSM (Four-Step Model). Lastly, a further effort in data collection, literature review, and expert survey should be made to enhance the accuracy and confidence of future research. 본 연구는 정책평가수단으로써 활동기반모형의 활용가능성을 평가하고자, 유연근무제(근무시간유연제 & 재택근무제)에 관한 시나리오 분석을 통해 교통부문에 미치는 영향을 분석하였다. 먼저, 첨두시간대의 통근통행량 분산을 통한 교통 혼잡 완화를 제외하고 근무시간유연제 적용시 활동-통행 특성에 있어서 뚜렷한 변화는 없다. 자가용을 이용한 총통행거리(vehicle kilometer of travel, VKT)는 인구집단별로 가구 및 개인 특성에 따른 제약요소의 정도에 따라 서로 다른 결과를 나타냈다. 재택근무제에 따른 영향은 통근통행의 축소로 통행빈도와 거리가 감소하며, 재택근무자의 활동영역이 주거지를 중심으로 전환되면서 비동력 수단을 이용한 단거리 통행이 증가하였다. 따라서 자가용을 이용한 VKT가 감소되는 결과를 가져오며, 다만 수단 전환(타 수단 ⇔ 자가용), (자가용을 이용한) 비업무통행의 증가 등으로 인해 인구집단별 VKT의 감소폭은 서로 다른 양상을 보인다. 연구를 통해 다음의 몇 가지 사항을 확인하였다. 첫째, 업무의 효율성을 높이기 위한 유연근무제가 직장인의 가구 및 개인의 특성에 따라 일상생활에 서로 다른 결과를 가져올 수 있으므로 사전에 인구집단별로 정밀한 영향평가가 필요하다. 둘째, ABM을 이용한 정책 평가에서 전반적으로 현실성 있는 결과를 도출하여 긍정적 활용가능성을 보여주었다. 셋째, 일반적으로 기존 모형에서 불가능했던 시계열 분석, 인구집단별 분석을 통해 정책 평가에 있어서 보다 정밀한 분석의 가능성을 보여주었다. 마지막으로, 추가적인 자료 보완과 함께 문헌연구와 전문가 의견 수렴을 통한 시나리오의 완성도를 높여 향후 연구 결과의 정확도와 신뢰도를 높이는 후속 작업이 필요하다.
Al합금의 원소가 용융산화에 미치는 영향(l. 산화에 의한 무게증가)
조창현,조창현,김일수,김철수,김창욱,Jo, Chang-Hyeon,Jo, Chang-Hyeon,Kim, Il-Su,Kim, Cheol-Su,Kim, Chang-Uk 한국재료학회 1997 한국재료학회지 Vol.7 No.7
용융산화에 의한 AI$_{2}$O$_{3}$복합재료의 형성에 미치는 합금원소의 영향을 연구하였다. AI-Mg-3Si 합금이 가장 우수한 산화거동을 보였다. 우수한 3원계로 선정된 AI-1Mg-3Si합금에 제 4원소 Sn, Cu, Ni, Zn을 양을 달리하여 각각 첨가하여 산화거동을 살펴보았다. 1273K, 1373K, 1473K, 에서 20시간 각각 산화실험을 한 결과, 1473K에서는 모든 합금계가 우수했으나 1373K, 1273K에서는 산화가 거의 일어나지 않았다.
감염 후유증으로 인한 강직성 관절에 시행한 슬관절 전치환술
조창현,임창무,배대경 대한슬관절학회 1997 대한슬관절학회지 Vol.9 No.1
Generally, exposure and the operative technique are common difficulty encountered in the total knee arthroplasty of ankylosed knee due to old infection sequelae. Also the postoperative range of motion and relief of pain is poor due to deformity and excessive soft tissue contracture around knee. There have heen few reports, however, that address the reconstructive challenge of total knee arthroplasty in a previously infected ankylosed knee. We performed TKA in thirty six patients who had ankylosed knee between July l986 and Dec. 199S. After follow up of average five years and one month, we analysed the results. The definition of ankylosis was a knee ROM less than 90 degree. Average age of patients were 36.7 years old. Twelve patients were men and twenty four patients were women. Sixteen patients of partial ankylosis and twenty patients of complete ankylosis were performed operation. There were nineteen cases of healed tubercuiosis knees and seventeen cases of healed pyogenic knees. For the release of soft tissue contracture in 9 cases, we lengthened quadrceps tendon with the method of modified V-Y advancement technique. Patella tendon was proximally reattached with staples and suture in 6 cases and tibial tubercle was proximally transferred in 3 cases. As results, the postoperative average range of motion was 79.3˚ (30˚ - l21˚) in complete ankylosis, 107˚ (60˚ - 135˚) in partial ankylosis. The average Hospital for Special Surgery knee rating score improved from 56.3 points preoperatively to 84.8 points postoperatively. Radiolucent line was observed in two Knees with less than 2mm width in three years and four months, and four years postoperatively, but the patient had no pain. In five patients who had poor gain of range of motion after operation, we perfonned arthroscopic adhesiolysis. In conclusion, regarding patient selection, reasonable bony development, relative]y healthy extensor mechanism and adequate soft tissue condition are important for success of TKA in old intection sequelae. TKA of ankylosed knee in old infection sequelae is a successful procedure which can obtain the restoration of function of the ankylosed knee.