• Composites Research
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• v.12 no.3
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• pp.55-65
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• 1999

In this paper, the thermal buckling and postbuckling behaviour of composite beam with embedded shape memory alloy (SMA) wires are investigated experimentally and analytically. The results of thermal buckling tests on uniformly heated, clamped, composite beam embedded with SMA wire actuators are presented and discussed in consideration of geometric imperfections, slenderness ratio of beam and embedding position of SMA wire actuators. The shape recovery force can reduce the thermal expansion of composite laminated beam, which result in increment of the critical buckling temperature and reduction of the lateral deflection of postbuckling behaviours. It is presented quantitatively on the temperature-load-deflection behaviour records how the shape recovery force affects the thermal buckling. The cross tangential method is suggested to calculate the critical buckling temperature on the temperature-deflection plot. Based on the experimental analysis, the new formula is also proposed to describe the critical buckling temperature of a laminated composite beam with embedded SMA wire actuators.

• Science of Emotion and Sensibility
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• v.11 no.3
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• pp.397-418
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• 2008

This research investigated differences of perception ratio and processes of memory reconstruction. To examine the differences in perception for positive or negative events related to individual subjective well-level, 199 participants were asked to report the perceived ratio of positive versus negative events for the provided event list. Also, recall differences of positive versus negative events were examined in relation to individual differences in happiness. Results partially supported the hypothesis that happy people perceive more positive stimulus in a given situation than less happy people. Happy people also showed more positive percentage in recalled events than actual ratio while unhappy people reported less positive recall percentage than actual ratio. These findings indicate existence of cognitive process that enhances positive or negative memory related to subjective well-being. Significant correlation between perceived ratio and recalled ratio further supports this proposition. Finally, theoretical implications of the present research and suggestions for future research were discussed.

• Journal of the Korea Society of Computer and Information
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• v.10 no.4 s.36
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• pp.17-27
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• 2005

In this study, it proposes the neural network system for character recognition and restoration. Proposes system composed by recognition part and restoration part. In the recognition part. it proposes model of effective pattern recognition to improve ART Neural Network's performance by restricting the unnecessary top-down frame generation and transition. Also the location feature extraction algorithm which applies with Hangeul's structural feature can apply the recognition. In the restoration part, it composes model of inputted image's restoration by Hopfield neural network. We make part experiments to check system's performance, respectively. As a result of experiment, we see improve of recognition rate and possibility of restoration.

• Korean Journal of Cognitive Science
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• v.6 no.2
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• pp.97-116
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• 1995

This study was conducted to investigate how syntaction and pragmatic constraints influence the sentential representation and memory accessibility. In order to seperate the syntactic constraints from the pragmatic constraint from the pragmatic constraints,the syntactic role of constituent in the sentence (subject or object) and the order of mention(first or second) were manipulted.After each sentence was presented by RSVP procedure,the probe recognition time was measured to investigate memory accessibility.In Experiment 1,in which SOA interval was 255ms,it was found that the subject of a sentece were more accessible than the object and participants first in a sentence were more accessible than participants mentioned later.However, in Experiment 2,in which SOA interval was 1540ms,it was found that participants mentioned first in a sentence were more accessible than participants mentioned later while there was no significant difference between the subject and object of a sentece.These results suggest that the syntactic and pragmatic constraints have an independent effect on the initial senential representation at the early stage of constructing representation,but as time passes only the pragmatic constraints influence sentential representation.These results also support a theoretical position which assumes that sentential representation is constructed through the process of convergent statisfaction of multiple constraints.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.25 no.1
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• pp.25-31
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• 2001

The theoretical modeling to predict the modulus of elasticity by the shape memory effect of dispersed particles in a metal matrix composite was studied. The modeling approach is based on the Eshelbys equivalent inclusion method and Mori-Tanakas mean field theory. The calculation was performed on the TiNi particle dispersed Al metal matrix composites(PDMMC) with varying volume fractions and prestrains of the particle. It was found that the prestrain has no effect on the Yonugs modulus of PDMMC but the volume fraction does affects it. This approach has an advantage of definite control of Youngs modulus in PDMMCs.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2014.06a
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• pp.346-348
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• 2014

VTS 관제사의 가장 기본적인 업무는 모니터링과 동시다발적으로 발생하는 사건을 처리하는 업무라고 할 수 있다. 이러한 모니터링 업무와 동시발생 업무의 관리의 소홀 또는 실패가 VTS 관련 사고로 이어지는 경우가 많다, 그러함에도 불구하고 지금까지는 이 분야에 대한 연구가 부족하였다. 본고에서는 VTS 모니터링 업무와 동시발생 업무 관리의 특성을 분석하고 특히 방해와 산만을 일으키는 요소들을 집중적으로 검토하고 이것이 관제사의 역량에 미치는 영향을 알아보았다. 또한 이러한 문제의 해결책으로 미래계획기억과 분산 기억 시스템 이론을 적용하여 실질적으로 관제사 업무에 도움을 줄 수 있는 방법을 모색하였다. 또한 e-Navigation 과 관련하여 VTS 장비에 장착하여 관제사의 모니터링 업무와 동시다발 발생 업무 관리를 도울 수 있는 도구 개발에 대한 아이디어를 제안하였다.

• Proceedings of the Korea Contents Association Conference
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• 2018.05a
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• pp.251-252
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• 2018

의미 있는 '하나의 경험'은 성장을 가져온다. 존 듀이는 '하나의 경험'을 하나의 예술작품이 만족스럽게 완결에 이르게 되고, 계속해서 고민하던 어떤 문제에 대한 해결책이 마침내 도출되는 것이라 말한다. 독서를 하거나 책을 쓰는 것 등도 언젠가는 종결에 이르게 되는데, 이러한 경우의 종결은 단순히 중지(cessation)가 아닌 하나의 과정의 결과인 것이다. 이러한 경험은 하나의 통일체(a whole)이며 그것 자체의 개별화된 특질과 자급자족(self-sufficiency)을 갖추고 있다. 바로 이러한 특징을 갖는 경험을 '하나의 경험'이라고 부르는 것이다. 학교 현장의 교육과정에서 '하나의 경험'이 되는 배움이란 교육적인 의미와 가치로서 인정되고 평생 기억에 남는 교육 경험 활동이라 할 수 있다. 학습자 입장의 배움, 자발성에 근거한 들뢰즈의 '배움' 이론이 '하나의 경험'으로 기억되는 의미 있는 가치로의 가능성을 탐구하고자 한다.

• Proceedings of the Korea Contents Association Conference
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• 2004.11a
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• pp.489-492
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• 2004

In this paper, we propose a representation method of emotions in RIDE(Robot Intelligence with Digital Emotion) project. The method used in RIDE not only represents the emotional state in James-Lange Theory but also represents that of the Cannon-Bard Theory. Furthermore, our method allow the memorization of an emotion so as to process the self-inflicting emotion mentioned in the Schafter-Singer Theory. We also allow the similarity and differences in the characteristics by compaing of two emotions.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.05a
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• pp.423-426
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• 2005

기억기반학습의 일종인 최근접 이웃(k nearest neighbor) 알고리즘은 과거의 데이터들 중에서 새로운 개체와 유사한 데이터들을 이용해서 새로운 개체의 목적 값을 예측하는 것이다. 이 경우 속성의 가중치를 계산하는 방식은 kNN의 성능을 결정하는 중요한 요소가 된다. 본 논문에서는 기존의 다른 이론들과 달리 정보이론에서 사용되는 엔트로피 개념을 이용해서 속성의 가중치를 이론적이고, 효과적으로 계산하는 새로운 방법을 제시하고자한다. 제안된 방법은 각 속성이 목적속성에 제공하는 정보의 양에 따라 가중치를 자동으로 계산하여 kNN의 성능을 향상시킨다. 마지막으로 이러한 방식의 성능을 다수의 실험을 통해 비교하였다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.37 no.5
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• pp.457-463
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• 2009

This paper describes the development of non-explosive separation(NES) device which can be equipped on a small satellite. It comprises mechanism itself and spring-type shape memory alloy(SMA) actuator. In order to design SMA actuator properly, the necessary actuation force is measured. Based on that result, SMA actuator is designed and fabricated. Finally, SMA actuator and the proposed mechanism are integrated. In order to evaluate performance of the developed NES, we carried out a response time test, preload test and shock level test. In near future, we expect to replace the imported NES device with the developed device.