• Journal of Internet of Things and Convergence
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• v.9 no.2
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• pp.1-9
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• 2023

This study was conducted for the purpose of improving the usability of the product through the usability evaluation of the voice tag reader to improve the life convenience of the visually impaired. Perceived usability evaluation was conducted for 19 evaluation items based on the evaluation model considering the usability principle and the characteristics of the visually impaired. A total of 50 participants were included for the analysis. As a result of the perceived usability evaluation of the visually impaired, the safety of the voice tag reader, voice and sound quality, and accuracy of voice information were relatively satisfactory. It was found that the reader received a low evaluation in terms of efficiency in use, including the size and weight of the reader, and the convenience of carrying and storing. For the usability improvement, the procedure for using a product needs to be more simplified, and it would be helpful to input and supply tags for commonly used objects in advance.

• Proceedings of the Korea Multimedia Society Conference
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• 2001.11a
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• pp.671-675
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• 2001

현재 전자상거래에서 가장 많이 사용되는 전자지불 방법은 신용카드를 이용한 방법이다. 그러나 신용카드를 이용한 결제는 해킹과 spoofing등의 방법을 통해 신용카드 정보를 해킹 당할수 있다. 본 연구에서는 종래의 전자 지불 승인의 약점을 개선하기 위한 방법으로 인터넷상에서도 신용카드를 소지한 사람만이 신용카드 결재를 수행할 수 있도록 하는 방법을 제시하고, 컴퓨터 부착용 신용카드 리더와 전자지불 시스템을 구현하였다. 본 연구에 구현한 전자지불 승인시스템은 Windows-2000, Windows-98 및 Windows-me에서 동작 가능하며, 50명 이상의 동시 사용자를 지원할 수 있다.

• Journal of Digital Convergence
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• v.20 no.4
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• pp.127-132
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• 2022

This study is a descriptive research to understand the leadership, communication ability, peer care behavior and relationship of nursing students. Data were collected from 192 nursing students in November 2021. The data were analyzed by t-test, ANOVA, Pearson's correlation ciefficients, using SPSS 28.0. As a result of the study, revealed positive correlations between leaderships and communication competence(r=.634, p<.001), communication competence and peer group caring interaction(r=.390, p<.001), leaderships and peer group caring interaction(r=.285, p<.001). Therefore, it is necessary to develop educational environment and programs to improve leadership, communication ability, and peer care behavior of nursing college students in the future.

• Journal of Digital Convergence
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• v.16 no.9
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• pp.443-452
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• 2018

The purpose of this study was to examine the effect of job-demands on social worker's organizational commitment. Espically this study focused on the moderating effect of LMX between job-demands and organizational commitment. The sample consisted of 189 social workers in 33 Senior Welfare Centers. The date was analyses using descriptive and multiple regression methods. The major findings of the study firstly were job-demands had negative effect on the social worker's organizational commitment and LMX had positive effect on the social worker's organizational commitment. Secondly, LMX had mederating effect between job-demands and organizational commitment. All these findings were discussed on Social Welfare Center and research.

• The Journal of the Korea Contents Association
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• v.15 no.12
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• pp.421-435
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• 2015

The purpose of this study was to explore the relationship between authentic leadership, organizational identification, job performance, and turnover intention. Specifically, the study investigated whether subordinates' organizational identification mediates the relationship between authentic leadership and subordinates' job performance and turnover intention. The study tested the mediated model using data from 299 employees working in a variety of organizations. The result revealed that authentic leadership was positively related to organizational identification and job performance but was negatively related to turnover intention. Further, organizational identification partially mediated the effects of authentic leadership on job performance and turnover intention. Theoretical and practical implications and limitations of the study were discussed.

• The Journal of the Korea Contents Association
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• v.14 no.9
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• pp.141-152
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• 2014

The user interfaces of electronic-book (e-book) readers in the e-book market are highly diverse, and this has led to major usability issues. In this paper, we analyze user preferences in terms of feature-setting options and the use of touchscreen actions in the six most commonly used e-book readers for smartphnoes. We identify alternatives for these features, which can enhance the usability of e-book readers, based on these user preferences. The survey results for the feature-setting options show that it is desirable to support at least eight background colors, as well as the ability to specify the color of the background icons. Adjusting the screen brightness using a setting bar with the support of an auto-brightness option is desirable, as in using +/- buttons to adjust the font size, as well as approximately 10 font faces. We find that it is desirable to support fade, slide, scroll and curl page-turing options, in addition to a simple non-animated page-turning effect, and that page movement should be accomplished using a scroll bar with the support of the page movement features by entering a page number, and by using the table of contents as well as bookmarks. The survey results on the use of touchscreen options indicated that it is useful to be able to configure the screen layout of an e-book reader by dividing it into three areas: left, right, and center. And then, when users briefly touch the left and right areas, it is ideal to move to the previous and subsequent pages, respectively; and when they briefly touch the center region, it is desirable to display a touch feature menu. We believe that the results of this study may provide guidance in the design of user interfaces for e-book readers.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.7
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• pp.4554-4561
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• 2014

In recent years, several paradigms have been identified to simplify the design of fault-tolerant distributed applications in a conventional static system. Leader Election is among the most noticeable, particularly because it is closely related to group communication, which provides a powerful basis for implementing active replications among other uses. On the other hand, despite its usefulness, to our knowledge, no study has focused on this problem in a mobile computing environment. The aim of this paper was to propose an algorithm for the leader election protocol in a fixed station based wireless networks environment. The election algorithm is much more efficient than other election algorithms in terms of the fault tolerance.

• Journal of KIISE:Computing Practices and Letters
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• v.14 no.9
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• pp.884-891
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• 2008

As the scale of RFID systems grows, decrease in recognition rate of collision between readers is becoming an issue. Time division technique may solve the problem, but this will cause total recognition time to increase. This issue must be solved for real-time inventory control. In this study, total recognition time was improved by placing ARCM in RFID systems. ARCM maintains short recognition time through efficient utilization of frequency channel and manages RFID systems to recognize the tag by avoiding interference. As the result of using ARCM, saving maximum 20% of time was possible.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.3C
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• pp.293-298
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• 2008

Recently, with the development of mobile techniques and the consideration to conveniency of using, the research on Mobile RFID Reader technique is getting more and more attentions. Until now, all security authentication algorithms of RFID are algorithms about range between Tag and Reader. The range between Reader and backend DB is composed by wired networks, so it's supposed to be secure range. But it must be taken account of the problem of information security and privacy in wireless range during the design of Mobile RFID Reader. In this paper we design an blind signature scheme based on weil-paring finite group's ECC encryption scheme, and by using this blind signature we propose the anonymous authorization scheme to Mobile RFID Reader's users.

• Proceedings of the KIPE Conference
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• 2013.07a
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• pp.159-160
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• 2013

본 논문에서는 백열등 조도 조절용 조광기에 호환 가능한 LED 구동회로를 제안한다. 조광기와 일반적인 LED 구동회로를 연결할 경우 트라이악(Triac)의 오동작에 의해 플리커(Flicker) 현상이 발생하는 문제점을 지니고 있다. 트라이악의 오동작을 방지하기 위해서는 트라이악에 일정 크기 이상의 전류가 인가되어야 하며 이를 만족하기 위한 조광기 호환회로가 필수적이다. 이러한 호환회로로써 수동 블리더(Passive Bleeder)는 전 동작 구간에서 전력소모가 발생하는 단점을 지니고 있다. 본 논문의 제안회로는 역률 만족을 위 해 Valley-fill 회로를 적용하였으며 트라이악의 오동작 시점을 정확히 검출하여 새로운 방식의 능동 블리더(Active Bleeder)를 적용함으로써 조광기의 오동작을 방지하면서 수동 블리더에 비해 효율이 개선되는 장점을 지닌다. 또한, Valley-fill과 인덕터를 적용한 1단 구성으로 효율개선 및 역률 개선의 장점과 입력 전류 리플의 감소로 인한 EMI 노이즈 저감 효과를 나타낸다. 본 논문에서는 제안된 회로의 타당성을 검증하기 위하여 13W급 조명용 LED 구동회로의 시작품 제작을 통해 그 우수성을 확인한다.