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Redundancy Resolution by Minimization of Joint Disturbance Torque for Independent Joint Controlled Kinematically Redundant Manipulators

  • Park, Myoung-Hwan
    • Transactions on Control, Automation and Systems Engineering
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    • v.2 no.1
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    • pp.56-61
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    • 2000
  • Majority of industrial robots are controlled by a simple independent joint control of joint actuators rather than complex controllers based on the nonlinear dynamic model of the robot manipulator. In this independent joint control scheme, the performance of actuator control is influenced significantly by the joint disturbance torques including gravity, Coriolis and centrifugal torques, which result in the trajectory tracking error in the joint control system. The control performance of a redundant manipulator under independent joint control can be improved by minimizing this joint disturbance torque in resolving the kinematic redundancy. A 3 DOF planar robot is studied as an example, and the dynamic programming method is used to find the globally optimal joint trajectory that minimize the joint disturbance torque over the entire motion. The resulting solution is compared with the solution obtained by the conventional joint torque minimization, and it is shown that joint disturbance can be reduced using the kinematic redundancy.

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Reliability Analysis of Power System with Dependent Failure (종속고장을 고려한 전력시스템의 신뢰도 평가)

  • Son, Hyun-Il;Kwon, Ki-Ryang;Kim, Jin-O
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.25 no.9
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    • pp.62-68
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    • 2011
  • Power system needs to sustain high reliability due to its complexity and security. The reliability prediction method is usually based on independent failure. However, in practice, the Common Cause Failures(CCF) and Cascading failure occur to the facilities in power system as well as independent failures in many cases. The CCF and Cascading failure turn out the system collapse seriously in a wide range. Therefore to improve the reliability of the power system practically, it is required that the analysis is conducted by using the CCF and Cascading failure. This paper describes the CCF and Cascading failure modeling combined with independent failure. The incorporated model of independent failure, CCF and cascading failure is proposed and analyzed, and it is applied to the distribution power system in order to examine this method.

Plans for Improvement of Laws and Systems to Promote Independent Living of Child Discharged from out-of-home Care (보호종료아동의 자립증진을 위한 법률 및 제도 개선방안)

  • Kim, Hyung Mo
    • The Journal of the Korea Contents Association
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    • v.22 no.2
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    • pp.457-474
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    • 2022
  • The purpose of this study is first to analyze domestic laws and systems related to independent living of child discharged from out-of-home care, second to conduct and analyze a survey on current status of child discharged from out-of-home care, and third to present plans for improvement of laws and systems to promote independent living of child discharged from out-of-home care. In this study, first, laws and systems related to independent living of child discharged from out-of-home care in Korea were analyzed. Second, a survey was conducted on the status of child discharged from out-of-home care, and the results were analyzed. With cooperation of Korea Child Welfare Association, Korea Child and Youth Group Home Council, and the Central Foster Support Center, a survey was conducted on 251 children discharged from out-of-home care, and the results were analyzed. Third, plans for improvement of laws and systems to promote independent living of child discharged from out-of-home care were presented.

The Study on Dwelling Environmental Planning in Old Age of the Middle Generation (중년층의 노년기 주거환경계획에 관한 연구 - 진주지역을 중심으로 -)

  • 고경필;윤재웅
    • Journal of the Korean housing association
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    • v.6 no.1
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    • pp.89-101
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    • 1995
  • This study is to analyze dwelling environmental planning in old age of middle age. For this purpose. the data were collected by using questionnaire distributed to 332. The data were analyzed by Chisquare test. The major findings of this research were as follow: 1. In housing plan of old age. they prefer new house .that is not exisiting house. independent house and ordindry housing region in the suburbs of urban. 2. It is 69.3~99 square meter what size of house is suitable for independent life of aged person for living with children. it is 102.3~132 square meter. 3. In the stage of independent or semi-independent life. they want aged couple-independent life. In the stage of dependent life. they want to be cared with children. 4. The garden(madang) is the most important space for age couple in establishing housing plan. They want to amplity life recuperation center and job providing facilities. In old age housing project. they prefer housing type with facility that combine old age house with young age house. According to increasement of dependence. the service support system required flexi-care-system.

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Performance of Vocabulary-Independent Speech Recognizers with Speaker Adaptation

  • Kwon, Oh Wook;Un, Chong Kwan;Kim, Hoi Rin
    • The Journal of the Acoustical Society of Korea
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    • v.16 no.1E
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    • pp.57-63
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    • 1997
  • In this paper, we investigated performance of a vocabulary-independent speech recognizer with speaker adaptation. The vocabulary-independent speech recognizer does not require task-oriented speech databases to estimate HMM parameters, but adapts the parameters recursively by using input speech and recognition results. The recognizer has the advantage that it relieves efforts to record the speech databases and can be easily adapted to a new task and a new speaker with different recognition vocabulary without losing recognition accuracies. Experimental results showed that the vocabulary-independent speech recognizer with supervised offline speaker adaptation reduced 40% of recognition errors when 80 words from the same vocabulary as test data were used as adaptation data. The recognizer with unsupervised online speaker adaptation reduced abut 43% of recognition errors. This performance is comparable to that of a speaker-independent speech recognizer trained by a task-oriented speech database.

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Train Students to Study Independently

  • Xie, Yong;Li, Ruheng;Ha, Jin-Cheol;Kim, Yun-Hae;Park, Se-Ho
    • Journal of Engineering Education Research
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    • v.15 no.5
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    • pp.87-92
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    • 2012
  • Independent study is a major ability of engineering students. In independent study training practice, we need to use different instructional strategies and responds to individual student needs and learning styles. The purpose of this paper is to demonstrate a four-step student independent study training mode we applied to teaching the Biomedical Engineering students in Dali University, China. We developed this teaching mode to fulfill the goals of the first years' undergraduates training and improve the students learning skills. The four-step teaching mode includes both in-class and out-of-class activities. The emphasis is on how to train students to get information from the reading materials, understand the concept, develop critical thinking and eventually become independent learner.

Structural insights into the transcription-independent apoptotic pathway of p53

  • Chi, Seung-Wook
    • BMB Reports
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    • v.47 no.3
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    • pp.167-172
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    • 2014
  • Reactivating the p53 pathway in tumors is an important strategy for anticancer therapy. In response to diverse cellular stresses, the tumor suppressor p53 mediates apoptosis in a transcription-independent and transcription-dependent manner. Although extensive studies have focused on the transcription-dependent apoptotic pathway of p53, the transcription-independent apoptotic pathway of p53 has only recently been discovered. Molecular interactions between p53 and Bcl-2 family proteins in the mitochondria play an essential role in the transcription-independent apoptosis of p53. This review describes the structural basis for the transcription-independent apoptotic pathway of p53 and discusses its potential application to anticancer therapy.

ON CHARACTERIZATIONS OF THE PARETO DISTRIBUTION BY THE INDEPENDENT PROPERTY OF UPPER RECORD VALUES

  • Lee, Min-Young;Lim, Eun-Hyuk
    • Journal of the Chungcheong Mathematical Society
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    • v.24 no.1
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    • pp.85-89
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    • 2011
  • We present characterizations of the Pareto distribution by the independent property of upper record values in such a way that F(x) has a Pareto distribution if and only if $\frac{X_{U(n)}}{X_{U(m)}}$ and $X_{U(m)}$ are independent for $1{\leq}m. Futhermore, the characterizations should find that F(x) has a Pareto distribution if and only if $\frac{X_{U(n)}}{X_{U(n)}{\pm}X_{U(m)}}$ and $X_{U(m)}$ are independent for $1{\leq}m.

Centrality of Visual Product Aesthetics: The Relationships with Innovativeness and Consumer Independent Judgment Making (시각제품에 대한 심미적 성향: 혁신성과 독립적 의사결정과의 관계)

  • Park, Hye-Jung;Jeon, Kyung-Sook
    • Journal of the Korean Society of Clothing and Textiles
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    • v.35 no.10
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    • pp.1139-1149
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    • 2011
  • This study tested the validity of a three-factor model of the centrality of visual product aesthetics developed by Bloch, Brunel, and Arnold (2003) and explored the relationships between the centrality of visual product aesthetics and the relevant constructs. It was hypothesized that the path relationships including innovativeness and consumer independent judgment making are relevant constructs of the centrality of visual product aesthetics. Data were gathered by surveying university students in the Seoul metropolitan area (using convenience sampling) and 322 questionnaires were used in the statistical analysis. Correlation analysis, factor analysis, and regression analysis were conducted to analyze the data. The findings show the validity of the three factors (value, acumen, and response intensity) of the centrality of visual product aesthetics. Tests of the hypothesized path show that innovativeness influences the centrality of visual product aesthetics both directly and indirectly through consumer independent judgment making. Innovativeness positively influenced consumer independent judgment making and the three factors of the centrality of visual product aesthetics, whereas consumer independent judgment negatively influences the response intensity factor of the centrality of visual product aesthetics. The implications of these findings and suggestions for future study are also discussed.