• Journal of the Institute of Electronics Engineers of Korea CI
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• v.43 no.3 s.309
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• pp.39-49
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• 2006

This paper proposes a hand-posture recognition method using reinforcement learning for the performance improvement of vision-based hand-posture recognition. The difficulties in vision-based hand-posture recognition lie in viewing direction dependency and self-occlusion problem due to the high degree-of-freedom of human hand. General approaches to deal with these problems include multiple camera approach and methods of limiting the relative angle between cameras and the user's hand. In the case of using multiple cameras, however, fusion techniques to induce the final decision should be considered. Limiting the angle of user's hand restricts the user's freedom. The proposed method combines angular features and appearance features to describe hand-postures by a two-layered data structure and reinforcement learning. The validity of the proposed method is evaluated by appling it to the hand-posture recognition system using three cameras.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10a
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• pp.232-234
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• 2004

강화 학습(Reinforcement Learning)을 실제 문제에 적용하는 데 있어 가장 큰 문제는 차원성의 저주(Curse of dimensionality)이다. 문제가 커짐에 따라 목적을 이루기 위해서 더 않은 단계의 판단이 필요하고 이에 따라 문제의 해결이 지수적으로 어려워지게 된다. 이를 해결하기 위칠 문제를 여러 단계로 나누어 단계별로 학습하는 계층적 강화 학습(Hierarchical Reinforcement Learning)이 제시된 바 있다. 하지만 대부분의 계층적 강화 학습 방법들은 사전에 문제의 구조를 아는 것을 전제로 하며 큰 사이즈의 문제를 간단히 표현할 방법을 제시하지 않는다. 따라서 이들 방법들도 실제적인 문제에 바로 적용하기에는 적합하지 않다. 이러한 문제점들을 해결하기 위해 복잡계 네트워크(Complex Network)가 갖는 작은 세상 성질(Small world Property)에 착안하여 자기조직화 하는 생장 네트워크(Self organizing growing network)를 기반으로 한 환경 표현 모델이 제안된 바 있다. 이러한 모델에서는 문제 크기가 커지더라도 네트워크의 사이즈가 크게 커지지 않기 때문에 문제의 난이도가 크기에 따라 크게 증가하지 않을 것을 기대할 수 있다. 본 논문에서는 이러한 환경 모델을 사용한 강화 학습 알고리즘을 구현하고 실험을 통하여 각 모델이 강화 학습의 문제 사이즈에 따른 성능에 끼치는 영향에 대해 알아보았다.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04b
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• pp.622-624
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• 2004

강화 학습(Reinforcement Learning)을 실제 문제에 적용하는 데 있어 가장 큰 문제는 차원성의 저주(Curse of dimensionality)였다 문제가 커짐에 따라 목적을 이루기 위해서 더 많은 단계의 판단이 필요하고 이에 따라 문제의 해결이 지수적으로 어려워지게 된다. 이를 해결하기 위해 문제를 여러 단계로 나누어 단계별로 학습하는 계층적 강화 학습(Hierarchical Reinforcement Learning)이 제시된 바 있다 하지만 대부분의 계층적 강화 학습 방법들은 사전에 문제의 구조를 아는 것을 전제로 하며 큰 사이즈의 문제를 간단히 표현할 방법을 제시하지 않는다. 따라서 이들 방법들도 실제적인 문제에 바로 적용하기에는 적합하지 않다. 최근 이루어진 복잡계 네트워크(Complex Network)에 대한 연구에 착안하여 본 논문은 자기조직화하는 생장 네트워크(Self organizing growing network)를 기반으로 한 간단한 환경 표현 모델을 사용하는 강화 학습 알고리즘을 제안한다 네트웍은 복잡계 네트웍이 갖는 성질들을 유지하도록 자기 조직화되고, 노드들 간의 거리는 작은 세상 성질(Small World Property)에 따라 전체 네트웍의 큰 사이즈에 비해 짧게 유지된다. 즉 판단해야할 단계의 수가 적게 유지되기 때문에 이 방법으로 차원성의 저주를 피할 수 있다.

• Korean Journal of Culture and Social Issue
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• v.28 no.2
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• pp.83-106
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• 2022

The current study examined the effects of the type and context of self-talk on task performance, task-post emotion, and perceived stress. Participants were 100 undergraduates in Busan. Participants were randomly assigned to one of four the experimental groups that were set by combining the narrative condition (the first-person versus non-first-person) to the content condition (self-reinforcing versus self-critic) to measure their pre and post intervention responses. For the analysis, we performed two-ways analysis of variance using the difference value of dependent variables comparing the pre and post-intervention. As a result of the analysis, we found that content condition of self-talk significantly influenced task performance, task-related confidence, emotion response, and perceived stress. That is, the self-reinforcement self-talk group showed better performance, higher task-related confidence, more positive emotion, lower negative emotion and less perceived stress than the self-critic self-talk group. The contents conditions of self-talk interacted with the narrative condition of self-talk to predict perceived stress, indicating that only non-first person/self-reinforceing self-talk group showed reduced levels of perceived stress.

• International Journal of Advanced Culture Technology
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• v.6 no.4
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• pp.131-142
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• 2018

This research examines the impact of teachers' self-evaluation on their classroom interactions with students. Changes in class behavior were analyzed by following two experienced middle school teachers for one semester of self-evaluation, comparing their classes at the beginning and end of the semester. A qualitative research method was adopted to take, a deeper look at the effect of changes in the teachers' in class actions. Both of the teachers reported positive effects of implementing self-evaluation on their teaching pedagogy, focusing specifically on their interactions with students when asking question and giving feedback. By the end of semester, they were asking broader questions that encouraged their students to engage in deeper thought and, when giving feedback, the class atmosphere was much brighter with better communication due to the positive reinforcement provided. This research supports research into ways to enhance teachers' expertise and improve their teaching via self-evaluation, centering on teachers' actions in the classroom.

• Journal of Fisheries and Marine Sciences Education
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• v.25 no.1
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• pp.40-52
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• 2013

The purpose of this study is to explore improving ways of screening of self-directed learning in self-governing high schools for expanding self-initiated learning screening system. To achieve the above aim, it was used survey method to 99 admission teachers of 12 self-governing high schools and analyzed responses with SPSS program. The research findings are as follows. To expand self-initiated learning screening system in self-governing high schools, it needs to obtain admission members of entrance committee, pooling of external screening members, quick decision of school admission members, increasing payment, training and understanding of the system and consideration of admission documents and study plan. Some improving ways of the expanding of self-initiated learning screening may be listed as follows: 1) development of screening model for self-governing schools 2) policy consideration for self-governing public high school 3) expanding autonomy of school 4) supporting budget 5) sharing of operation case and reinforcement of public relations.

• Journal of the Architectural Institute of Korea Structure & Construction
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• v.35 no.8
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• pp.123-130
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• 2019

Recently, it is required to develop a monitoring technology that combines an FBG sensor as a means for continuously monitoring whether reinforcing effect of FRP is maintained on FRP reinforced structural members. However, most existing researches focus on the insertion of FBG sensors into bar-shaped FRPs, and there is insufficient study on the details strip-type FRPs combined with FBG sensors. Therefore, in this paper, it is studied to develop a reinforcement in which a FBG sensor is combined with a FRP strip. Especially, combination of FRP and FBG sensor. For this, a series of experiments were performed to find the adhesive strength of fiber-FRP-epoxy joints, the tensile strength of FBG sensor part with reflection-lattice, and the performance depending on the connection method of FRF and FBG sensor. As a result of the study, it was found that a minimum strength of $216.15N/mm^2$ is required for incorporating FBG sensors in FRP using epoxy. It is considered that the adhesion length of epoxy joints should be more than 50mm. When the FBG sensor is attached to the FRP strip as an epoxy, it is considered appropriate to use the complete attachment and the sensor non-attachment method.

• Advances in concrete construction
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• v.11 no.3
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• pp.193-206
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• 2021

Extensive research has been conducted on the basic mechanical property and structural applications of engineered cementitious composites (ECC). Despite the high tensile ductility and high toughness of ECC, transverse steel reinforcement is still necessary to confine ECC for high performance. However, limited research has examined performance of ECC confined with practical amount of transverse reinforcement. This paper presents the results of axial compression tests on 14 square ECC columns and 4 conventional concrete columns (used as control specimens) with transverse reinforcement. The test variables were spacing, configuration (square ties or square and diamond shape ties), and yield strength of stirrups. The test showed that ECC columns confined with steel stirrup had good compressive ductility, and the stirrup spacing had the greatest effect on the compressive performance. The self-confinement effect of ECC results in a more uniform but slower expansion of the whole column compared with CC ones. The test results are then compared against the predictions from a number of existing models for conventional confined concrete. It is indicated that these models fail to predict the axial strains at peak axial stress and the trend of the stress-strain curve of steel stirrups-confined ECC with sufficient accuracy. Several new equations are then proposed for the compressive properties of steel-confined ECC based on test results and potential approaches for future studies are proposed.

• Journal of Korean Public Health Nursing
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• v.13 no.2
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• pp.215-226
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• 1999

The purpose of this study was to investigate the factors influencing self care in ostomates, to provide the basic data for self care promoting intervention, The subject of this study were 110 ostomates living in Deagu and Deajon, during the period from March to April. 1998. The instruments for this study were the self care scale developed by Lee Ji Sook(1990), the family support scale by Lee Ji Sook(1990), the self esteem scale by Rosenberg(1965) and the hope scale by Nowotny(1989). The instruments for this study were pretested on the ostomates for reliability and validity. The data were analyzed using descriptive statistics, t-test, ANOVA, Pearson correlation coefficients and stepwise multiple regression. The results are as follows : 1. The average score on the self care was 2.90. 2. There were significant positive correlations between self care and other factors self esteem(r=.652 P<.05), family support (r=.632 P<.05) and hope(r= .604 P<.05). 3. The variables that affected the self care of the subjects were self esteem, hope, family support, economical status, fecal control type and monthly participation in ostomate meetings in that order. These variance of self care was R2=62 percent by calculating the sum of those variables. The results of this study might help nurses and other health providers to develop interventions for the self care reinforcement of ostomates.

• Proceedings of the Korea Concrete Institute Conference
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• 2002.10a
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• pp.409-414
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• 2002

This study is intended to develop the self water proof admixture for durability concrete by anti-corrosion inhibitor. Chloride induced corrosion of reinforcement is one of the main factor which cause the deterioration of concrete structure. When the substitute anti-corrosion agents for a part of self waterproofing agent, the corrosion-proof increases for the increased water proofing capacity. And proper self waterproofing agent by cement weight in concrete was generally positive effect to concrete compressive strength, slump, freezing and thawing resistance. Also, permeability and absorption show a straight decrease when self waterproofing agent is added.