• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2004.07a
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• pp.354-354
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• 2004

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2004.07a
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• pp.205-205
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• 2004

• Journal of Fisheries and Marine Sciences Education
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• v.18 no.2
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• pp.98-107
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• 2006

This study has been made to see how much the execution results of the promotion policy for middle school teaching staffs succeeded for education development. The objects of the study are 70 physical education teachers in middle school in Busan, 2005, and the method is through questionnaires. The aim of the study is to grasp the propriety, the suitability, the effectiveness, the efficiency and the correspondence on the execution results of the promotion policy of middle schools' educational officials, and to refer to them at the policy. The conclusions are as follows:1. As to the propriety of promotion policy, it shows to have 65.8% support, so the aim selection proves not to be much unreasonable. 2. As to the suitability, it shows to have 52.5% support, so the selection of the policy ways for practicing the policy aim proves to be a little unsuitable. 3. As to the effectiveness, it shows to have 70.7% support, and the rate of support is the highest of the change factors of evaluation, so it proves to be very successful in the achievement of policy aim. 4. As to the efficiency, it shows to have 63.8% support, so the policy drive activity proves to be inefficient. 5. As to the correspondence, it shows to have 46.2% support, and it is the lowest mark of the change factors of evaluation. Therefore it proves that the favor-receiver, the physical education teachers have very low degree of good feeling.

• Journal of Korean Neurosurgical Society
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• v.66 no.2
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• pp.121-132
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• 2023

Objective : The parafascicular nucleus (PF) plays important roles in controlling the basal ganglia. It is not well known whether the PF affects the development of abnormal involuntary movements (AIMs). This study was aimed to find a role of the PF in development of AIMs using optogenetic methods in an animal model. Methods : Fourteen rats were underwent stereotactic operation, in which they were injected with an adeno-associated virus with channelrhodopsin (AAV2-hSyn-ChR2-mCherry) to the lateral one third of the PF. Behavior test was performed with and without optical stimulation 14 days after the injection of the virus. AIM of rat was examined using AIM score. After the behavior test, rat's brain was carefully extracted and the section was examined using a fluorescence microscope to confirm transfection of the PF. Results : Of the 14 rats, seven rats displayed evident involuntary abnormal movements. AIM scores were increased significantly after the stimulation compared to those at baseline. In rats with AIMs, mCherry expression was prominent in the PF, while the rats without AIM lacked with the mCherry expression. Conclusion : AIMs could be reversibly induced by stimulating the PF through an optogenetic method.

• Korean journal of communication and information
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• v.60
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• pp.150-171
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• 2012

According to the result of the online survey of SNS users, SNS users' use motivations consist of 'information', 'participation', and 'interaction'. SNS use motivations explain characteristics of an individual SNS very well. SNS users that aim to collect information use much more the SNS for communication like 'Twitter' and 'Me2day' than other SNS. SNS users that aim to participate in communication through SNS use much more 'Cyworld' that is joined by the most subscriber. And SNS users that aim to interact with other users use much more the SNS for network like 'Facebook' and 'Cyworld'. This tendency can also be seen in the use hours and access times of SNS by SNS use motivations. Meanwhile, the SNS Users that aim to collect information and interact with other users positively rate SNS messages. On the other hand, the SNS Users that aim to participate in communication through SNS negatively rate those. This confirms that SNS use motivations affect SNS users' recognition of SNS messages.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.30 no.7
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• pp.81-89
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• 2002

Guidance laws can be conceptually classified into three categories although their mathematical representations are various and different. In this paper, a generalized conceptual guidance law including the concepts of the above categories is proposed. The aim angle is introduced using the geometry of the collision triangle. The aim angle represents the arbitrary angle between the pursuit angle and the expected collision angle. The objective of the proposed guidance law is to make the aim angle zero asymptotically. It can be shown that the aim angle error response for the considered system is same as that of the first order system. When the autopilot of the missile system has slow dynamics, autopilot time lag may deteriorate the performance of the guidance law performance. In this case, another new guidance law compensating the autopilot time lag effect is proposed. To verify the proposed guidance laws, several numerical simulations are performed.

• IE interfaces
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• v.9 no.2
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• pp.191-202
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• 1996

A variety of approaches on performance evaluation modeling have appeared in the technical literature for flexible manufacturing systems(FMS) which can be evaluated only through computer simulation. This study represents a comparative approach for FMS performance evaluation modeling based on reliability, availability and maintainability, and life cycle cost. The methodology proposed in this research includes the following three-step generative approaches. First, a static model to find the initial system configuration is considered under the assumption that the system availability is given as one (failure and maintenance are not considered), and in second step, a stochastic simulation is proposed to serve as a performance evaluation model for FMS with stochastic failure and repair time. In the last step, we developed a simulation modeling using a simulator, FACTOR/AIM to consider a variety of performance factors and dynamic behavior of FMS. Also the applicability and validity of the proposed approaches has been tested and compared through the results of a sample problem using computer programs and procedures developed in each step.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2000.04a
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• pp.377-380
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• 2000

본 연구에서는 자동차의 차체조립공정설계를 위하여 FACTOR/AIM 및 자체 개발한 생산시스템 성능평가를 위한 시뮬레이션 프로그램을 이용하여 비교 연구하였다. 이를 위하여 먼저 자체에서 개발한 시스템성능 산정 방법으로 초기 해를 구하고 세부 생산라인의 고장 Data와 조립라인의 구성, 운반장비 등의 다양한 여건을 고려하기 위하여 FACTOR/AIM을 사용하였다. Data의 분석을 위하여 Expert Fit를 사용하였으며 초기 시스템 모델링 및 Data로부터 목표 생산시스템을 만족하는 시스템을 단계별로 찾아가는 과정을 사용하여 최적 해를 구하였다. 본 연구에서 분석한 K회사의 경우 목표 생산량 70대/시간을 만족하기 위하여 4 차의 개선을 통하여 71.57대/시간의 생산라인을 구하였다. 본 연구에서 생산조립라인의 공정설계를 위한 시뮬레이션 과정을 실 예를 들어 제시하였으며 다른 제품의 생산공정분석에도 활용 가능하리라 생각된다.

• Journal of Korea Foundry Society
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• v.22 no.4
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• pp.160-166
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• 2002

The structure and properties of Fe-29Ni-17Co alloy which had been melted using induction furnace in air atmosphere and than electroslag-remelted were investigated. The oxygen content was reduced to 0.03% when the ingot was refined from $0.09{\sim}0.12%$ of that air melted. The amounts of spheroidal oxides inclusions and gas porosities of ingot were markedly reduced by the ESR process. CTE of ESR ingot contained small amount of oxides and porosities was found to be lower than that of AIM ingot, and tensile properties of ESR ingot and plate were found to be superior than that of AIM ingot and plate.

• Proceedings of the Korea Water Resources Association Conference
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• 2004.05b
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• pp.376-380
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• 2004

측벽이 존재하는 개수로 난류흐름에 대한 DNS 자료를 이용하여 난류의 비등방성을 해석하였다. 측벽의 2등분선(sidewall bisector)에서 난류강도의 분포를 통해 바닥과 자유수면에서의 비등방성을 분석하고, AIM을 도입하여 흐름장 전반에 걸쳐 세부적인 비등방성 해석을 수행하였다. 측벽의 2등분선에서의 난류강도의 분포를 통해 바닥과 자유수면 근처에서 난류강도가 강한 비등방성을 갖는 것을 볼 수 있었다. 또한 3개의 다른 영역에서 AIM의 도입을 통해 측벽이나 바닥근처에서는 난류의 비등방성이 구형 관수로 흐름과 유사한 것으로 나타났으나, 개수로 난류흐름의 주된 특성이 velocity-dip phenomena가 존재하는 영역에서는 구형 관수로 흐름과는 달리 천이영역이 존재한다는 것을 알 수 있었다.