• Database Research
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• v.34 no.3
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• pp.137-147
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• 2018

A key to a well-performing human activity recognition (HAR) system through machine learning technique is the availability of a substantial amount of labeled data. Collecting sufficient labeled data is an expensive and time-consuming task. To build a HAR system in a new environment (i.e., the target domain) with very limited labeled data, it is unfavorable to naively exploit the data or trained classifier model from the existing environment (i.e., the source domain) as it is due to the domain difference. While traditional machine learning approaches are unable to address such distribution mismatch, transfer learning approach leverages the utilization of knowledge from existing well-established source domains that help to build an accurate classifier in the target domain. In this work, we propose a transfer learning approach to create an accurate HAR classifier with very limited data through the multitask neural network. The classifier loss function minimization for source and target domain are treated as two different tasks. The knowledge transfer is performed by simultaneously minimizing the loss function of both tasks using a single neural network model. Furthermore, we utilize the unlabeled data in an unsupervised manner to help the model training. The experiment result shows that the proposed work consistently outperforms existing approaches.

• Journal of the Korean Chemical Society
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• v.51 no.3
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• pp.279-286
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• 2007

In this study, we investigated the influences of cognitive conflict and situational interest induced by a discrepant event and an alternative hypothesis, attention and state learning strategies on conceptual change. A preconception test was administered to 486 seventh graders. They also completed the questionnaires of cognitive response and situational interest to a discrepant event before/after presenting an alternative hypothesis. After learning the concept of density with a CAI program as conceptual change intervention, the tests of attention, state learning strategies, and conceptual understanding were administered as posttests. Analyses of the results for 197 students having misconceptions about density revealed that post-cognitive conflict was significantly higher than pre-cognitive conflict. However, there was no statistically significant difference between the test scores of pre-situational interest and post-situational interest. Pre-cognitive conflict only exerted a direct effect on post-cognitive conflict, while post-cognitive conflict exerted a direct effect and Journal of the Korean Chemical Society an indirect effect via attention on conceptual understanding. Both pre- and post-situational interests were found to influence on conceptual understanding via attention. Attention had influences positively on deep learning strategy and negatively on surface learning strategy. There was a relatively small effect of state learning strategies on conceptual understanding.

• Journal of Gifted/Talented Education
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• v.22 no.1
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• pp.117-139
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• 2012

This study compared the cognitive conflict on peer instruction concerning the level of difficulty in question, between middle school science gifted students and non-gifted students. For the study, 35 the 7th grade science-gifted students in the organization affiliated with Science Education Institute for the Gifted in Seoul and Gyeong-gi province, and 14 the 8th grade science-gifted students, and 71 the 8th grade students. They performed peer instruction on propagation of straight light and composition of light and then, discussed three concept problems. After discussing the students took paper pencil test about changing levels of cognitive conflict. Regardless of the level of difficulty in question, the science-gifted students showed meaningful decreased figures on cognitive re-evaluation factors after peer-discussion. They trusted their peers, so during discussion, they explained their concepts. Furthermore discussion process enabled them to do reflective thinking. consequently, discord of students dropped, and total figures of cognitive conflict also declined. Science-gifted students have a tendency to worry lower than general students, though they felt anxiety as difficulty of the problems after peer-discussion. Through peer-discussion, science-gifted students presented statically decreased anxiety factors. By means of analyzed results of changing cognitive conflict of science-gifted students, developing and adapting strategies of cognitive conflict considering learner characteristics of science-gifted students is needed.

• 한국HCI학회:학술대회논문집
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• 2009.02a
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• pp.650-653
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• 2009

Decrease in crew performance is frequently cited as a major causal factor in maritime accidents. Although considerable researches on working hours undertaken by seafarers have been conducted through interviews and record analyses, experimental studies on the effects of factors, such as high workload, shift patterns, stress, sleep deprivation, and disturbance on the cognitive performance of mariners have been limited. Other safety-critical transport industries, such as aviation and rail, have developed fatigue management tools to help managements in the work patterns of their operators. Such tools for mariners would assist shipboard crews, marine pilots, and shore managers for planning and improving work schedules. The overall aim of this paper is to determine a fatigue factor that can be applied to human performance data as a part of a software program that calculates total cognitive performance. This program enables us to establish the levels of cognitive performance in a group of marine pilots in order to test a decision-making task based on radar information. This paper addresses one of the factors that may contribute to the determination of various fatigue factors: the effects of different work patterns on the cognitive performance of a marine pilot.

• Journal of Elementary Mathematics Education in Korea
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• v.16 no.2
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• pp.295-320
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• 2012

The purpose of this study is searching students' cognitive structures before and after learning division of fraction. Also the researchers investigated how their structures are connected when they solve division of fraction problems through individual interviews. The researcher suggested the instruction of division of fraction from the results.

• The Journal of the Korea Contents Association
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• v.14 no.9
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• pp.332-342
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• 2014

The purpose of this study is to investigate the Effects of the Integrative Cognitive Training Program on Cognitive Function of the community elderly. Nonequivalent control group pretest-posttest design was used. 28 subjects were assigned to each of the group. 24 sessions of the integrative Cognitive Training Program were applied to the experimental group from September to December. The program was provided twice per week for 12weeks, total 24 sessons to the experimental group. Cognition scale for older adults(CSOA) was used to measure cognitive function of the groups before and after the Intervention. The score of Cognition Scale for Older Adults was significantly increased in experimental group than in control group(p< .05). The results of the study that Integrative Cognitive Training Program can be vey useful to improve the cognitive ability for the community elderly.

• Journal of the Korean Applied Science and Technology
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• v.40 no.3
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• pp.402-411
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• 2023

The purpose of this study was to investigate the effects of a cognitive enhancement program combined Silbot on cognitive function, depression, and dementia prevention behavior in the elderly complaining of subjective memory decline. The subjects were 170 elderly people living in Seongnam-si, Gyeonggi-do, and the study was performed at a welfare center. A total of 20 sessions program using Silbot and physical activity was developed and applied, and were evaluated using the Korean version of Montreal Cognitive Assessment (K-MoCA), Geriatric depression Scale(GDS) , and Dementia Prevention Behavior before and after intervention. As a result of the study, the cognitive enhancement program combined Silbot showed statistically significant changes in cognitive function (t=-4.49, p<.001) and depression (t=2.58, p=.023) in the elderly. Therefore, it is expected that the cognitive enhancement program using Silbot will be a useful program that can enhance the cognitive function of the elderly and reduce depression.

• Proceedings of the Korean Society for Cognitive Science Conference
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• 2002.05a
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• pp.46-50
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• 2002

인간의 지식 표상 규명에 대한 연구는 인간을 대상으로 연구하는 심리학에서뿐만 아니라 인간의 지능을 컴퓨터를 이용하여 구현하고자 하는 인공지능 학문에서도 오래 전부터 매우 중요한 화두가 되고 있다. 특히 인간의 지식 중 언어 지식에 대한 연구는 인간의 언어처리 과정 및 현상을 규명하고 이해하고자 하는 심리언어학에서뿐만 아니라 인간의 언어를 컴퓨터를 이용하여 처리하고자 하는 전산언어학 연구에 있어서도 매우 중요하다. 본 논문은 피험자를 대상으로 한 어절 재인 시 관찰되었던 언어 현상을 설명할 수 있는 시뮬레이션 모델과 이에 근거한 심성어휘집내에서의 한국어 어절의 표상 구조를 제안한다.

• Proceedings of the Korea Contents Association Conference
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• 2018.05a
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• pp.71-72
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• 2018

블록체인은 다양한 기술 응용성을 가지고 있으며 일반 대중은 암호화폐를 통하여 그 기술을 접하고 있다. 그러나 일부 전문가와 일반인들이 블록체인과 암호화폐의 개념을 이해하는데 있어 혼돈이 있어 왔다. 본 논문은 인지 부조화 개념 속에서 혼선의 요소를 파악하고 암호화폐와 블록체인 대해서 보다 명확한 이해를 돕고자 한다.

• 한국과학교육학회:학술대회논문집
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• 2008.01a
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• pp.129.1-129.1
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• 2008