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A Combined Model of Trip Distribution, Mode Choice and Traffic Assignment
박태형,Park, Tae-Hyung Korean Institute of Industrial Engineers 2002 산업공학 Vol.15 No.4
In this paper, we propose a parametric optimization approach to simultaneously determining trip distribution, mode choice, and user-equilibrium assignment. In our model, mode choice decisions are based on a binomial logit model and passenger and cargo demands are divided into appropriate mode according to the user equilibrium minimum travel time. Underlying network consists of road and rail networks combined and mode choice available is auto, bus, truck, passenger rail, and cargo rail. We provide an equivalent convex optimization problem formulation and efficient algorithm for solving this problem. The proposed algorithm was applied to a large scale network examples derived from the National Intermodal Transportation Plan (2000-2019).
태권도 수련프로그램이 소아비만의 건강체력과 키 성장에 미치는 영향
박태형(Tae - Hyung, Park),허정석(Jeong -Seok, Heo) 한국무예학회 2009 무예연구 Vol.3 No.2
체지방률이 20%이상인 소아비만 20명(대조군10명, 태권도 수련군10명)을 대상으로 1회 50분간, 주 5회, 12주간 태권도 수련을 실시하여 신체구성, 건강 체력 및 키 성장 인자에 미치는 영향을 연구하였다. 태권도 수련군에서 신장이 1.71㎝, LBM은 1.00㎏이 각각 유의하게(p<.01) 증가하고, 최대산소섭취량은 155.17(㎖/min), 체중당 산소섭취량은 3.98 (㎖/㎏/min) 각각 유의하게(p<.01) 증가되어 심폐기능이 개선되었다. 또한 악력 2.56㎏, 사이드스텝 12.00회, 제자리 멀리뛰기 19.14㎝가 각각 유의하게(p<.05) 증가하였으며, 인슐린 저항성의 지표인 HOMA 지수가 유의하게 (p<.05) 감소하고, 키 성장 인자인 IGF-1과 GH이 유의하게(p<.05) 증가되었다. 소아비만아동의 태권도 수련은 신체구성 및 인슐린저항성을 개선과, 키 성장 인자를 증가시켜 비만의 개선과 키 성장에 영향을 미치는 것으로 나타났다. I researched about the effect of Taekwondo training for obese children’s physical systems, physical strength, maximum oxygen intake, serum lipid and IGF-1. Subjects were consisted of 20 obese children(taekwondo: 10, con: 10) whose percentage body fat is over 20%. The taekwondo program was conducted 50minutes, 5 times a week for 12weeks.The results of this study are as follow; 1. Heigh(1.71 ㎝), LBM(1.00㎏) maximum oxygen intake(155.17 ㎖/mim), and oxygen intake per weigh(3.98 ㎖/㎏/min) were significantly increased after taekwondo group. The taekwondo training was effect of cardiovascular improvement. 2. Grip strengh(2.56㎏), side step(12.00 times), site-ups(11.57 times), standing long jump(19.14m) were signinficantly increased and 20m reciprocate running(-1.17 seconds) and 50m running(-1.11 seconds) were significantly decreased after taekwondo group. 3. HDL-C(4.00 ㎎/㎗) was significantly increased and insulin(3.0 ㎕U/㎖) and HOMA index(0.61) were significantly decreased after taekwondo group. 4. IGF-1 (81.10 ng/㎗) and GH (0.07 ng/㎗) concentrations were significantly incerased after taekwondo group. Consequently, taekwondo training program for obese children improved significantly cardiorespiratory fitness, healt-realted physical fitness and body composition. In addition, taekwondo program improved HOMA index through decreasing insulin concentration. Especially, GH and IGF-1 were significantly increased after 12weeks taekwondo training. Therefore, it might be thought that taekwondo training program would be a positive role for body composition, health-related and IGF-1 by growth of height.
힘센엔진 연료분사노즐의 내구성 향상을 위한 설계 개선 연구
박태형(Tae-Hyung Park),김동훈(Dong-Hun Kim),갈상학(Sang-Hak Ghal) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
This research was carried out to improve durability of fuel injection nozzle (FIN) of HHI HIMSEN engines. In order to improve combustion efficiency and reduce smoke generation of diesel engines, it is necessary to increase the fuel injection pressure, but it has influence on life span of fuel injection systems. In addition to high oil prices, the spread of using low quality fuel also has a bad effect. Damage on the needle seat of FIN is one of the most significant problems related durability of diesel fuel injection systems. The impact force occurring on the needle seat during the instant of the needle valve closing is the main cause of the corruption. The effect on the impact force of main design parameters of FIN were analyzed through hydraulic analysis and design of experiments (DOE), thereby the optimal design improvement for reducing the impact force were deduced.