http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
조대승,Tae-Muk Choi,Jin-Hyeong Kim,Nikola Vladimir 대한조선학회 2018 International Journal of Naval Architecture and Oc Vol.10 No.5
Stiffened panels are widely used in naval architecture and ocean engineering, and knowledge about their dynamic behaviour represents important issue in the design procedure. Ordinary vibration analysis consists of natural frequencies and mode shapes determination and can be extended to forced response assessment, while the Structural Intensity (SI) analysis, assessing magnitude and direction of vibrational energy flow provides information on dominant transmission paths and energy distribution including sink positions. In this paper, vibrational energy flow in stiffened panels under harmonic loading is analyzed by the SI technique employing the finite element method. Structural intensity formulation for plate and beam element is outlined, and developed system combining in-house code and general finite element tool is described. As confirmed within numerical examples, the developed tool enables separation of SI components, enabling generation of novel SI patterns and providing deeper insight in the vibrational energy flow in stiffened panels, comparing to existing works.
조대승,이상직,이기철,장응찬,권태동,이수천 한국운동영양학회 2001 Physical Activity and Nutrition (Phys Act Nutr) Vol.5 No.2
Though skeletal muscle protein makes up more than 60% of whole body protein and protein metabolism in skeletal muscle, which accounts for more than 25% of the whole body protein turnover, it has received relatively little attention in comparison to carbohydrate and fat metabolism in the exercise science field. Among amino acids, the branched-chain amino acids(BCAA) taken up by the muscle, rather than the liver, to contribute to oxidative metabolism during endurance exercise. Moreover, since the oxidation of BCAA in muscles may exceed the catabolic capacity to increase BCAA availability, plasma BCAA levels may decline during endurance exercise. And also, an increase in FFA availability during endurance exercise alter the plasma ratio of free tryptophan to BCAA. It has been hypothesized that and increase in the plasma ratio of free tryptophan to BCAA concentration during endurance exercise is cause of central fatigue due to increased uptake of tryptophan in the brain and increased synthesis of serotonin. Based on these hypothesis, it has been suggested that supplementation of BCAA before endurance exercise may inhibite an increase in the plasma ratio of free tryptophan to BCAA concentration and improve endurance exercise performance. And also, another way to manipulate the plasma concentration of free tryptophan is carbohydrate feedings. However considerable controversy surround the relationship of the supplementation of BCAA and(or) carbohydrate to endurance exercise performance. Future study, therefore, is obviously required to verify the effects of hormones and secondary metabolites on central fatigue and endurance performance after BCAA supplementation. For objective study, more research must be conducted to investigate the effects of amount and time of BCAA supplementation, moreover exercise intensity and duration.
조대승,김병희,김진형,Nikola Vladimir,최태묵 대한조선학회 2016 International Journal of Naval Architecture and Oc Vol.8 No.2
In this paper, a numerical procedure for the natural vibration analysis of plates with openings and carlings based on the assumed mode method is extended to assess their forced response. Firstly, natural response of plates with openings and carlings is calculated from the eigenvalue equation derived by using Lagrange's equation of motion. Secondly, the mode superposition method is applied to determine frequency response. Mindlin theory is adopted for plate modelling and the effect of openings is taken into account by subtracting their potential and kinetic energies from the corresponding plate energies. Natural and frequency response of plates with openings and carlings subjected to point excitation force and enforced acceleration at boundaries, respectively, is analysed by using developed in-house code. For the validation of the developed method and the code, extensive numerical results, related to plates with different opening shape, carlings and boundary conditions, are compared with numerical data from the relevant literature and with finite element solutions obtained by general finite element tool.
조대승 한국소음진동공학회 1997 소음 진동 Vol.7 No.5
This paper presents the swing motion analysis of the container crane headblock with the passive control device using hydraulic motors and anti-swing ropes. The device hauls at the headblock to opposite direction of its swing motion using the tension difference between anti-swing ropes connected to the headblock. To consider this control mechanism, the headblock is modelled as the rigid bar suspended by two hoist ropes at the overhead trolley and its non-linear equation of motion is derived using Lagrange's equation. Some numerical experiments using the equation are carried out to investigate the swing motion characteristics of the headblock under the variation of geometric relation among the cargo handling components and to evaluate the performance of the anti-swing device.