• 제어로봇시스템학회:학술대회논문집
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• 1993.10a
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• pp.276-280
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• 1993

An articulated, multifinger mechanical hand can carry out grasping and manipulation operations on objects of different type and shape. In this paper the architecture of the mechanical hand is presented. Joints are driven by two antagonist tendons. Strain gauges are used to derive tendon tensions, and located in the palm of the hand. Angular defection of the joints is measured by Hall effect sensors attached to the joints. A multiprocessor-based architecture for controlling the hand is illustrated.

• Proceedings of the KIPE Conference
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• 1999.07a
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• pp.643-645
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• 1999

The conventional high frequency phase-shifted full bridge dc/dc converter has a disadvantage that a circulating current flows through transformer and switching devices during the freewheeling interval. Due to this circulating current, RMS current stress, conduction losses of transformer and switching devices are increased. To alleviate this problem, this paper provides a circulating current free type high frequency soft switching phase-shifted full bridge (FB) dc/dc converter with the modified energy recovery snubber (ERS) attached at the secondary side of transforemr.

• Journal of KSNVE
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• v.3 no.1
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• pp.29-37
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• 1993

This study is concerned about the impact type damper for effectively restraining the high vibration amplitude in the resonance regions. The theoretical analysis is based on the assumption that the impacts occur twice per cycle at an equal time interval. Simple but reasonable approximations have been derived for the optimum collision clearance and maximum amplitude ratio. Using the impact dampers which is rigidly attached to the primary vibration system, we have experimented for mass ratios and restitution coefficients. The experimental results are in good agreement with theoretical results.

• Proceedings of the KIEE Conference
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• 1990.07a
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• pp.467-470
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• 1990

This thesis presents a simple heuristic algorithm which can be applied. to a quadruped wafting vehicle for increasing the terrain adaptability. The proposed method controls a leg length which is in tranfer phase to maintain initial orientation of the robot body by using FSR type force sensors attached to foot-tips. Also, some basic experiments using the vehicle are performed to demonstrate the effectiveness of the algorithm.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2002.05a
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• pp.329-334
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• 2002

Preliminary test for the design and construction of a tuned dynamic absorber is a conducted. Proposed tuned dynamic absorber is a cantilevered beam type, and is supposed to adjust its natural frequency according to the changing operation condition of the primary system. The modal mass of the dynamic absorber is the easiest to control, therefore, the position of the attached mass of the dynamic absorber is considered as the main design parameter of the absorber. The effect of the dynamic absorber is experimentally verified under various operation conditions of the primary system.

• Aerospace Engineering and Technology
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• v.2 no.2
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• pp.33-44
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• 2003

This paper describes the design and analysis technology of composite flexure and composite paddle-type blade which are all key technologies on hingeless rotor system. Through replacing the existing metal or engineering plastic flexure part with composite part, Several required structural analysis were accomplished, which are static analysis by using NASTRAN and dynamic analysis by using FLIGHTLAB. The dynamic characteristics of composite hingeless hub attached with paddle-type blade was also investigated. Further more, small-scaled paddle-type blade was designed using froude scaled properties of existing full size blade. Through this design procedure of composite paddle-type blade, the structural design method was achieved. These results will be applied to accomplishing current project named as "the development of next-generation helicopter rotor system."

• Journal of the Korean Institute of Educational Facilities
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• v.5 no.2
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• pp.57-66
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• 1998

The present, there are no evident standards about facilities of minimum-sized kindergarten and lower grades elementary school. So, there are many serious obstacles that related laws and regulations, planning for facilities and scales in this country. Accordingly, this study proposed the concept, type, and size of minimum-sized kindergarten and lower grades elementary school, in case big cities of high density. 1. The concept of minimum-sized kindergarten and lower grades elementary school is defined to the large scale school and class, that integration of children of kindergarten into lower grades elementary school. 2. The type of minimum-sized kindergarten and lower grades elementary school is classified into branch school type and detached school type. The former is located in the main elementary school, The latter is separated from the main elementary school. And each type is classified into singleness case and attached case. 3. The number of students per minimum-sized kindergarten and lower grades elementary school is hold from two hundred children to three hundred children in 12 classes, but suitability is from one hundred to two hundred children. And class sizes proposed $20{\sim}25$ children in minimum-sized kindergarten and $25{\sim}30$ children in lower grades elementary school.

• Journal of Korean Academy of Nursing
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• v.30 no.3
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• pp.584-594
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• 2000

The purpose of this study was to identify emotional responses, of stroke patients using Q analysis. From the data analysis, five types of emotional responses in stroke patients were classified as follows. 1. Acceptance and Overcoming : They attached to life strongly and had self-confidence of recovery. They were striving against their situation through using anything else good for their recovery. 2. Anger Type : They recognized a labile feeling and were angered easily. They had a self-confident and self-esteemed personality before they had a stroke. 3. Conflict Type : They wanted interaction with others. This individual recognized that no one knows their agonies. They were thankful to god or their family, while they could not control their minds. Their family supports were low. 4. Deficiency of self-esteem Type : They had a self-confidence of recovery, but they were in fear of interaction with others. Especially, they were ashamed of themselves. They have a high sense of responsibility and nigh self-esteem for themselves before they had a stroke. 5. Despair Type. : They were sorry to trouble their family. They felt depression, anxiety, darkness, uselessness of themselves, and they wanted to die. They recognized financial burden. for their family. The characteristics of the five types of stroke patient identified in this study will be used to assess emotional nursing needs for stroke patients. The findings of this study will provide practical guidelines for developing nursing interventions for stroke patients based on the characteristics of subjectivity types.

• Journal of the Korean Home Economics Association
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• v.50 no.1
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• pp.1-13
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• 2012

The purpose of this research is to explore the self-concept and school life adjustment based on group classification of attachment types with parents, teachers and peer groups among 6th grade students at elementary schools. The findings suggest that attachment is highest with one's mothers, followed by peer groups, fathers and teachers. This is in accordance with the overall tendencies of children to be attached to their parents, teachers, peer groups, according to their self-concept and school life adjustment. In addition, the tendency of attachment with parents, teachers, and peer groups according to gender is not meaningful except for peer-group affection between boys and girls. Furthermore, an integrated attachment type is ranked highest, followed by parents attachment type, peer attachment type, and unstable attachment type, in order based on cluster analysis. Finally, each attachment group among students showed meaningful differences in socio-demographic variables, self-concept, and school life adjustment.

• Journal of the Korean Society of Safety
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• v.31 no.3
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• pp.82-88
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• 2016

Ballasted gravel will be damaged or worn by the repetitive train load. And these damages of ballast gravel could be increased by increasing vehicle speed. Therefore, various techniques for reducing the ballast pressure have been proposed, such as the attached pad type of sleeper bottom for ballasted track. In this study, spring stiffness test method were proposed to evaluate the performance of under sleeper pad for ballasted track. Standard ballast plate(SBP) was developed to simulate the ballast gravel and compared with the foreign test results. Experimental results showed a trend similar to the previous studies according to various loading plate type. specimen type(Type A, Type B) differences in spring stiffness according to hardness were not significant. Also, the FSP (Flat steel plate) - shaped jig is about 80% of the spring stiffness was greater than SBP. Therefore, to evaluate the actual spring stiffness of under sleeper pad for ballasted track, it was important to adopted the appropriate spring stiffness test method using the SBP to simulate actual field conditions.