• Journal of the Korean Society of Food Science and Nutrition
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• v.19 no.3
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• pp.215-218
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• 1990

Saturation growth model was evaluated to predict the formation of product as a function of time. Good agreement was observed with homogenous and heterogenous reactions, Prediction of product yield can be made reasonably using this model. In addition accuracy of measured values can be roughly evaluated by this model. User-friendly computer program in BASIC was written to evaluate the constants Pmax and K as well as averages of relative errors.

• Annual Conference of KIPS
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• 2015.10a
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• pp.1786-1787
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• 2015

무안경 3차원 입체영상 시스템은 광고 패널, 공연 전시 등에 활용되고 있다. 본 연구에서는 무안경식 입체영상 시스템의 디스플레이로 활용되고 있는 렌티큘러 방식 3차원 입체 영상에 대해 화질변화에 따른 사용자의 반응을 뇌파 (Electroencephalogram, EEFG) 측정을 통해 분석하였다. 총 26명의 피험자를 대상으로 렌티큘러 방식의 디스플레이를 통해 최적입체영상과 왜곡입체영상을 차례로 제시하고 각 영상에 대해 획득한 뇌파를 통계 분석하여 상관관계를 확인하였다. 분석 결과 뇌파진동 중 알파파의 경우 최적입체영상과 왜곡입체영상 사이에서 통계적으로 유의미한 차이가 확인되지 않았으나 베타파의 경우 통계적으로 유의미한 차이가 확인되었다. 베타파의 경우 왜곡입체영상에서 최적입체영상보다 통계적으로 유의미하게 높게 나타났으며 이는 왜곡입체영상 시청 시 피로감 또는 불안감 증폭에 따른 베타파의 뇌파활동이 높아진 것으로 예상된다. 본 연구결과를 바탕으로 랜티큘러 방식의 무안경 입체영상에 대한 객관적 사용자 평가를 위해 뇌파분석을 활용한 접근 방법이 가능함을 확인하였다.

• The Journal of the Korea Contents Association
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• v.13 no.1
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• pp.19-29
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• 2013

In the current Internet environment where there is high space complexity of information, search engines aim to provide accurate information that users want. But content-based method adopted by most of search engines cannot be used as an effective tool in the current Internet environment. As content-based method gives different weights to each web page using morphological characteristics of vocabulary, the method has its drawbacks of not being effective in distinguishing each web page. To resolve this problem and provide useful information to the users, this paper proposes an evaluation method based on categories. Category-based evaluation method is to extend query to semantic relations and measure the similarity to web pages. In applying weighting to web pages, category-based evaluation method utilizes user response to web page retrieval and categories of query and thus better distinguish web pages. The method proposed in this paper has the advantage of being able to effectively provide the information users want through search engines and the utility of category-based evaluation technique has been confirmed through various experiments.

• The Transactions of the Korea Information Processing Society
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• v.4 no.11
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• pp.2786-2800
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• 1997

In this paper, we investigate how well the channel memory (statistical dependence in the occurrence of transmission errors) can be used in the evaluation of widely used error control schemes. For this we assume a special case named as the simplest Markovian block-error pattern with two states, in which each block is classified into two classes of whether the block transmission is in error or not. We apply the derived pattern to the performance evaluation of the practical link-level procedures, LAPB/D/M with multi-reject options, and investigate both throughput and user-perceived response time behaviors on the discrete-time domain to determine how much the performance of error recovery action is improved under burst error condition. Through numerical examples, we show that the simplest Markovian block-error pattern tends to be superior in throughput and delay characteristics to the random error case. Also, instead of mean alone, we propose a new measure of the response time specified as mean plus two standard deviations 50 as to consider user-perceived worst cases, and show that it results in much greater sensitivity to parameter variations than does mean alone.

• Journal of the Korea Computer Graphics Society
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• v.22 no.5
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• pp.37-47
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• 2016

This study evaluate user feedback such as physiological response and facial expression when subjects play a social decision making game with interactive virtual agent partners. In the social decision making game, subjects will invest some of money or credit in one of projects. Their partners (virtual agents) will also invest in one of the projects. They will interact with different kinds of virtual agents which behave reciprocated or unreciprocated behavior while expressing socially affective facial expression. The total money or credit which the subject earns is contingent on partner's choice. From this study, I observed that subject's appraisal of interaction with cooperative/uncooperative (or friendly/unfriendly) virtual agents in an investment game result in increased autonomic and somatic response, and that these responses were observed by physiological signal and facial expression in real time. For assessing user feedback, Photoplethysmography (PPG) sensor, Galvanic skin response (GSR) sensor while capturing front facial image of the subject from web camera were used. After all trials, subjects asked to answer to questions associated with evaluation how much these interaction with virtual agents affect to their appraisals.

• Science of Emotion and Sensibility
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• v.25 no.3
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• pp.15-32
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• 2022

This study seeks to clarify the mechanisms of anthropomorphism and positive user experience. This study adopts the "computers are social actors" (CASA) paradigm to verify the causal relationship between social response and anthropomorphism and correctly explicate this paradigm. The intimacy-forming and anthropomorphizing effects of deep self-disclosure in interpersonal relationships were replicated in relationships between humans and conversational agents to induce both social response and anthropomorphism. Then, the mediating effect of intimacy on the anthropomorphizing effect of deep self-disclosure was explored with psychological models that revealed the causal relationships between social connections, including intimacy and anthropomorphism. Furthermore, we explored how intimacy and anthropomorphism trigger positive user experiences. The results demonstrated that the deeper the self-disclosure depth was, the more intimate and humanly the agent was perceived and the more positive the user experience was. In addition, the effect of self-disclosure depth on anthropomorphism and positive user experience was completely mediated by intimacy. This means that when using a computer with interpersonal characteristics, people anthropomorphize it and have a positive experience because people react socially to objects with social cues. This study bridges the gap between the CASA paradigm and anthropomorphism research, suggesting the possibility of psychological explanations for the principle of human-computer interactions. In addition, it explicates the mechanism of anthropomorphism and positive user experience, emphasizing the importance of social response-that is, intimacy.

• The Journal of Korean Institute for Practical Engineering Education
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• v.2 no.2
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• pp.165-171
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• 2010

Usability heuristics("heuristics") are general principles for usability evaluation during user interface design. Our ultimate goal is to extend the practice of usability evaluation methods to a wider audience(e.g. user interface designers and engineers) than Human Computer Interaction(HCI) professionals. To this end, we explored the degree to which Jakob Nielsen's ten usability heuristics are understood by professors and students in design and computer engineering. None of the subjects received formal training in HCI, though some may have had an awareness of some HCI principles. The study identified easy-to-understand heuristics, examined the reasons for the ambiguities in others, and discovered differences between the responses of professors and students to the heuristics. In the course of the study, the subjects showed an increased tendency to think in terms of user-centric design. Furthermore, the findings in this study offer suggestions for improving these heuristics to resolve ambiguities and to extend their practice for user interface designers and engineers.

• Archives of design research
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• v.15 no.1
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• pp.369-388
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• 2002

21th century that is repealing change is making the world that can enjoy human spiritual character and freedom wholeheartedly. Therefore, meet hereupon arid design may have to bring conversion to position of beginning that can be software at position that is hardware look raw and result look who is wrapping last result arts provide cause. Therefore, user supposes that do difficult form in that recognize things form, and that difference about attribution reaction may do differ and contradictory attribution reaction while specially 40s and 50s recognize product form laying stress on external form embodiment of product form meaning by guess and this research compares and investigates attribution process for human's attribution reaction instinct and attribution reaction type through scientific, theoretical considerations about form and things theoretically and defined cause reasoning in design. And designed product that things are recognized whether felt thing in product form is what hearing example relation sex between analysis and form of meaning induction by attribution leading person about subjective estimation reaction through literature arrange, and analyze and defined if cause some effect to designed product because drawing urea about attribution reaction through an experiment. And presented model about design access method and forward pratical use possibility and hereafter subject together with conclusion.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2008.10a
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• pp.70-73
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• 2008

본 연구는 이미지의 장르의 차이가 사용자의 시각 피로도에 미치는 영향에 관한 연구이다. 실험은 20명의 대학생을 대상으로 각각 다른 감성반응을 위해 선정된 다큐멘터리, 사랑, 뉴스 및 스포츠 장르의 이미지를 각각 10장씩을 보여주고, 그에 따른 시각 피로도를 자율신경계 반응 측정(PPG, GSR,SKT)과 동공 영상 기록(동공 변화율) 및 주관적 설문(불쾌도, 긴장도, 피로도)을 하였다. 유의성 검증을 위하여 이미지의 장르를 독립변수로 그에 따른 종속변수를 개인차가 고려된 생리신호 결과와 동공 변화율(픽셀/초) 및 주관적 설문 응답 결과로 하여 일변량 분산 분석을 하였다. 본 연구를 통해 이미지의 장르에 따라 불쾌, 긴장 및 피로 할 경우 자율 신경계 반응의 특정한 패턴을 발견 할 수 있었다.

• KIPS Transactions on Computer and Communication Systems
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• v.5 no.11
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• pp.379-384
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• 2016

NAND flash storage is widely used for computer systems, because of it has faster response time, lower power consumption, and larger capacity per unit area than hard disk. However, currently used I/O scheduler in the operating system is optimized for characteristics of the hard disk. Therefore, the conventional I/O scheduler includes the unnecessary overhead in the case of the NAND flash storage to be applied. Particularly, when the write requests performed intensively, garbage collection is performed intensively. So, it occurs the problem that the processing of the I/O request delay. In this paper, we propose the new I/O scheduler to solve the problem of garbage collection performs intensively, and to optimize for NAND flash storage. In the result of performance evaluation, proposed scheme shows an improvement the user responsiveness by reducing 1% of the average read response time and 78% of the maximum response time.