• Structural Engineering and Mechanics
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• v.49 no.3
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• pp.329-353
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• 2014

Increasing usage of tank cars and their intrinsic instability due to sloshing of contents have caused growing maintenance costs as well as more frequent hazards and defects like derailment and fatigue of bogies and axels. Therefore, varieties of passive solutions have been represented to improve dynamical parameters. In this task, assuming 22 degrees of freedom, dynamic analysis of partially filled tank car traveling on a curved track is investigated. In order to consider stochastic geometry of track; irregularities have been derived randomly by Mont Carlo method. More over the fluid tank model with 1 degree of freedom is also presented by equivalent mechanical approach in terms of pendulum. An active suspension system for described car is designed by using linear quadratic optimal control theory to decrease destructive effects of fluid sloshing. Eventually, the performance of the active suspension system has been compared with that of the passive one and a study is carried out on how active suspension may affect the dynamical parameters such as displacements and Nadal's derailment index.

• Korean Journal of Child Studies
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• v.20 no.4
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• pp.75-89
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• 1999

Mother-Child Interactions during Problem Solving were analyzed in relation to the child's attachment security and temperament. Subjects were fifty-three 44-to 57-month-old children and their mothers. Attachment security was assessed by Attachment Q set (Waters, 1987); mother-child interactions were observed at home, and maternal ratings of child temperament were collected by questionnaire (Chun 1993). Attachment security scores were positively related to mother's cognitive assistance and positively interactions with the child and to the child's positive affect toward mother. The child's activity perceived by mother was negatively related to mother's efficient interactions and positively to the child's "reliance on mother." The child's behavior toward the mother in the task session and the child's temperament added variance above attachment in accounting for the mother's behavior.

• Korean Journal of Child Studies
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• v.31 no.1
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• pp.35-46
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• 2010

This study analyzed variables that affect children's leadership qualities. The subjects were 400 five-year-old children and their mothers living in the Seoul metropolitan area. The instruments used in this study were the Young Children's Leadership Scale (Kim, 2006), Temperament(Hong, 2008), Peer Interaction (Choi, 2004), Mother's Verbal Control Modes(Do, 1997), and the HOME instrument (Rhee and Jang, 1982). The data collected was analyzed by descriptive statistics, Pearson's correlation, and multiple regression analysis. Our results indicated that (a) girls' scores on leadership were higher than those of boys. (b) Boys' leadership qualities were related to children's temperament, peer relationship, maternal verbal control modes, and home environment. (c) Girls' leadership qualities were related to children's temperament, peer relationship, and home environment. (d) In particular, it was noted that children's temperament (in terms of their sensitivity/endurance) was the strongest predictor for leadership qualities in both boys and girls.

• Structural Engineering and Mechanics
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• v.2 no.3
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• pp.269-284
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• 1994

The analysis and tests of thin-walled channel frames including nonlinear flexible or semi-rigid connection behaviour is presented. The semi-rigid connection behaviour is modelled using a mathematical approximation of the connection flexibility-moment relationship. Local instability such as local buckling and torsional flexural buckling of the member are included in the analysis. The full response of the frame, up to the collapse load, can be predicted. Experimental investigation was carried out on a series of simple double storey symmetrical frames with the purpose of verifying the accuracy and validity of the analysis. Agreement between the theoretical and experimental results is acceptable. The investigation also shows that connection flexibility and local instability such as local buckling and torsional flexural buckling can affect the behaviour and strength of thin-walled frames significantly. The results can also provide further insight into the advanced study of practical structures where interaction between flexible connections and phenomenon associated with thin-walled members are present.

• Interaction and multiscale mechanics
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• v.3 no.4
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• pp.373-387
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• 2010

This study is intended to assess low frequency sound radiated from a viaduct under normal traffic. The bridge comprises steel box girders and wide cantilever decks on which vehicles pass. The low frequency sound and the acceleration response of the bridge under normal traffic are measured to investigate how bridge vibrations affect the low frequency sound observed near the bridge. Observations demonstrate that strong relationships exist between frequency characteristic of bridge's acceleration response and the sound pressure level of low frequency sound. A noteworthy point is that the dynamic feature of the sound pressure level is mostly affected by dynamic feature of the span locating near the observation point.

• International Journal of Human Ecology
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• v.7 no.1
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• pp.13-23
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• 2006

The purpose of this study was to provide basic information regarding the planning of lounge and hallway areas for skilled nursing facilities for the elderly, given that residents spend much of their time in these areas. This study examined Korean elderly residents' occupancy and behavior in lounges and hallways in order to analyze how plan type, spatial composition, and equipment affect residents. To do this, observations were conducted in five facilities that were provided to the elderly at no charge. Results indicate that a central garden offers a wide hallway area that can be used not only for strolling but also for list of activities; at the same time, it can reduce the overall rate of inactivity. A shorter distance between the lounge and hallway on the opposite side is likely to help better disperse residents' throughout the facility. Hallway corners have potential for activities that may require sofas, tables, or equipment for individual activities; they could also be used for planned interaction programs or unplanned collaboration on the part of small groups of residents.

• Journal of the Korean Institute of Intelligent Systems
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• v.16 no.1
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• pp.37-42
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• 2006

Recently, studying on modeling the emotion of a robot has become issued among fields of a humanoid robot and an interaction of human and robot. Especially, modeling of the motivation, the emotion, the behavior. and so on, in the robot, is hard and need to make efforts to use ow originality. In this paper, new modeling using mathematical formulations to represent the emotion and the behavior selection is proposed for the software robot with virtual sensor modules. Various points which affect six emotional states such as happy or sad are formulated as simple exponential equations with various parameters. There are several experiments with seven external sensor inputs from virtual environment and human to evaluate this modeling.

• 제어로봇시스템학회:학술대회논문집
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• 1991.10a
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• pp.533-538
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• 1991

In the design and operation of robot arms with flexible links, the equations of motion are required to exactly model the interaction between rigid motion and elastic motion and to be formulated efficiently. Thus, the flexible link is represented on the basis of the D-H rigid link representation to measure the elastic deformation. The equations of motion of robot arms, which are configured by the generalized coordinates of elastic and rigid degrees of freedom, are formulated by using F.E.M. to model complex shaped links systematically and by eliminating elastic mode of higher order that does not largely affect motion to reduce the number of elastic degree of freedom. Finally, presented is the result of simulation to flexible robotic arm whose joints are controlled by direct or PD control,

• Proceedings of the KSME Conference
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• 2001.11a
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• pp.453-458
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• 2001

The stability of turbulent nonpremixed interacting flames is investigated in terms of nozzle configuration shapes which depend on the existence of the center nozzles. Six nozzle arrangements which are cross 4, 5, 8, 9, square 8 and circular 8 nozzles are used for the experiment. Those are arranged to see the effect of the center nozzle out of multi-nozzle. There are many parameters that affect flame stability in multi-nozzle flame such as nozzle separation distance, fuel flowrates and nozzle configuration, but the most important factor is the existence of nozzles in the center area from the nozzle arrangement. As the number of nozzle in the area is reduced, more air can be entrained into the center of flame base and then tag flame is formed. In the case of circular 8 nozzles, blowout flowrates are above 5.4 times compared with that of single equivalent area nozzle.

• BMB Reports
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• v.43 no.6
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• pp.407-412
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• 2010

Homeodomain (HD) is a highly conserved DNA-binding domain composed of helix-turn-helix motif. Drosophila Vnd (Ventral nervous system defective) containing HD acts as a regulator to either enhance or suppress gene expression upon binding to its target sequence. In this study, kinetic analysis of Vnd binding to DNA was performed. The result demonstrates that DNA-binding affinity of the recombinant protein containing HD and NK2-specific domain (NK2-SD) was higher than that of the full-length Vnd. To access whether phosphorylation sites within HD and NK2-SD affect the interaction of the protein with the target sequence, alanine substitutions were introduced. The result shows that S631A mutation within NK2-SD does not contribute significantly to the DNA-binding affinity. However, S571A and T600A mutations within HD showed lower affinity for DNA binding. In addition, DNA-binding analysis using embryonic nuclear protein also demonstrates that Vnd interacts with other nuclear proteins, suggesting the existence of Vnd as a complex.