• Journal of KIISE
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• v.43 no.11
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• pp.1245-1258
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• 2016

Cryptographic technologies providing confidentiality and integrity such as encryption algorithms and message authentication codes (MACs) are necessary for preventing security threats in the Internet of Things (IoT) where various kinds of devices are interconnected. As a number of encryption schemes that have passed security verification are not necessarily suitable for low-power and low-performance IoT devices, various lightweight cryptographic schemes have been proposed. However, a study of lightweight MACs is not sufficient in comparison to that of lightweight block ciphers. Therefore, in this paper, we reviewed various kinds of MACs for their classification and analysis and then, we presented a new way for future MAC development. We also implemented major MAC algorithms and performed experiments to investigate their performance degradation on low-end micro-controllers.

• The Journal of the Korea Contents Association
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• v.17 no.2
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• pp.239-248
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• 2017

As China has rapid economic growth and the increase of national income that makes the development of Chinese cosmetic industry has huge market potential of the industry. But most of the cosmetics market is monopolized by foreign companies, the local cosmetics production enterprises are not equipped with professional production equipment. In these reasons Chinese cosmetics have low quality, inadequate research and development, poor cosmetics brand, unclear marketing, trade and technical barriers and other issues. In order to fulfill the purpose of this paper, data analysis was carried out focusing on domestic & foreign research papers, statistics, reference books, research reports, internet websites etc. As a result of the analysis, in order to increase the export of Chinese cosmetics, it should be strengthened the development of manufacturing technology and brand creativity, eradicating illegal copies, use the online market circulation way, the construction scheme, and cosmetic technical barriers and deregulation should be through the diversification of propaganda, etc. This paper describes that the project of Chinese cosmetics export increase and find the inspirations from other products of export. But national, regional specific programs which have huge information is the future research topics.

• Journal of Distribution Research
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• v.6 no.2
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• pp.91-108
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• 2002

While a lot of research has been done in the area of the B2C e-commerce, heavily on the Internet shopping, a study on the B2B e-commerce has not been improved enough to be competitive for its importance and practical use. We have studied to build an effective database, attempting to complement and further replace in the long term the off-line distribution channel which has yet to be fully evolve with respect to effectiveness and efficiency. For the building of the effective database, we have gathered information from the related institutions and characterized a fishery channel, and surveyed existing literatures and consumers for deriving factors affecting their purchase intentions and satisfactions. Based upon this survey we constructed the entity-relationship diagram(ERD) which possibly provided some perspectives for the future application. This study focuses on the improvement in the distributional efficiency not only minimizing the intra-organizational conflict and resistance but also maximizing the role function of each party of the organization.

• The Journal of the Korea Contents Association
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• v.9 no.8
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• pp.158-165
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• 2009

Counselling between a patient and a doctor is crucial in telemedicine. In order for the doctor to examine the patient accurately, it needs an auscultation, at least. Currently, some video conference systems are implemented but it is hard to use them in the case of an cardiac disorder, because the patients suffering from cardiac disorder cannot be examined by a stethoscope over Internet. To solve this problem, the remote counselling service has to support real time transmission of the heart sound of the patient. In this paper, we present a remote counselling system with stethoscope. We also design and implement the system in order for health monitor to connect the patient with his attending physician for the environment of u-healthcare service. The proposed system supports a mobility for doctor and patient by exchanging IP addresses at an user authentication protocol. The system implemented by this paper can be used for cardiac patients in remote clinical setting in the future.

• The Journal of the Korea Contents Association
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• v.17 no.11
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• pp.9-17
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• 2017

In this paper, we propose a method to develop a multimeter which is used for measuring electric signals in industrial field by using battery and display of smart phone. Most of the multimeters that are linked to existing smartphones are connected to Bluetooth, which is inconvenient for battery use and low in measurement accuracy. To improve this, we developed smart multimeter that can supply power and data at the same time by USB OTG method which can be used by sharing the power of smartphone. We also developed a smart multimeter that can measure resistance, DC voltage, current, AC voltage and current. Developed an Android app with a button that displays measurement data and can select the type of electric signal to be measured, and tests whether the manufactured system is operating normally or not. Respectively.The results of this study confirm that it is possible to fabricate a smart meter that has equal or better performance compared to existing instruments and does not require a separate power source or display, and it is expected to be a reference for the development of various smart instruments in the future.

• Journal of Satellite, Information and Communications
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• v.10 no.3
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• pp.1-5
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• 2015

Recently, RF energy harvesting technology is a promising technology for small-size IoT(Internet of Things) devices such as sensor to resolve battery scarcity problem. When applied to existing cognitive radio networks, this technology can be expected to increase network throughput through the increase of cognitive user's operating time. This paper proposes a optimal channel-selection policy for RF energy harvesting CR networks model where cognitive users in harvesting zone harvest ambient RF energy from transmission by nearby active primary users and the others in non-harvesting zone choose the channel and communicate with their receiver. We consider that primary users and secondary users are distributed as Poisson point processes and contact with their intended receivers at fixed distances. Finally we can derive the optimal frame duration, transmission power and density of secondary user from the proposed model that can maximize the secondary users's throughput under the given several conditions and suggest future directions of research.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.3
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• pp.741-746
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• 2015

Recently, as mobile operating system market and wireless communication technology have been rapidly developed, many devices such as smart phones, air conditioners, smart TVs, cleaning robot, and cameras become available with android operating system. Accordingly, collecting variety of information through many everyday use devices with network connections is now enabled. However, in the current market, most devices are controlled individually developed applications, and there is growing need to develop a master application that can control multiple devices. In this paper, we propose and implement a system that can control multiple android-based devices on a Wired/Wireless router(AP) registered through web server. we expect such an effort can attribute to future IoT researches.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.06a
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• pp.910-913
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• 2007

Information society, introduced by the rapid progress of computer technology and communication technology, has brought us the comfort and prosperity on every aspect of human life. However, the adverse and harmful effects of it, including the ethics problems, turn out to be serious. Concerning these problems, purpose of this study is set to investigate the actual state of ethics awareness on information and communication, since ethics awareness is required more urgently than ever in this era of technology. While adolescents, who will lead the future society, comprise the majority of internet usage population in our nation, they are exposed to the harmful and risky contents in the periods during which their world view would be established. Furthermore, the problems emerging in the progress towards information-oriented society are jeopardizing the dignity and inherent value of human being, therefore causing the serious moral chaos and social problems. In this paper, the awareness level of middle school students in Gwangju City has been investigated especially in the aspect of information and communication. Based on the results, it is revealed that the efforts of government, social organization, students' parents as well as the education circles are essential. Also the proposal for improvement on the awareness level has been presented.

• Journal of KIISE:Computing Practices and Letters
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• v.14 no.8
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• pp.778-782
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• 2008

The performance in combination of wired and wireless mesh network which will be a main access network in future internet is directly linked with service quality to users. In this paper, we evaluate variant TCP performance and analyze traffic characteristics on Wireless (Seoul National University Mesh testbed) - Wired (KOREN/Abilene) - Wireless (HP Mesh testbed in the USA) Network. We found that RTT is proper in this network to serve a VoIP service. Also we propose an enhanced TCP protocol which can perform well in both wireless network which has many packet losses and wired network which has high bandwidth and long delay.

• The Journal of Information Systems
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• v.20 no.3
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• pp.257-277
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• 2011

The current study categorizes factors of smartphone into three, using KANO model: attractive factors which cause only product satisfaction, must-be factors for dissatisfaction, and one-dimensional factors for both. Based on it, it presents a new model for the effects that smartphone factors have on satisfaction or dissatisfaction. The purpose is to theoretically explain that smartphone factors on which companies and users place a high value can actually affect satisfaction or dissatisfaction. After choosing 15 factors out of 25 which had been selected through literature study, these were divided into attractive, must-be, and one-dimensional ones. 93 out of 109 questionnaires returned were used for analysis. After frequency analysis using SPSS were conducted on the surveys, the factors were grouped, based on KANO table. The grouping results are as follows. Attractive factors include 'expansion slots for external memory, battery desorption, brand awareness, mobile banking and internet telephony'. Must-be ones include 'multi-touch, information security, entertainment, information retrieval, location based service and SNS. Finally, 'screen visibility, size of internal memory, the amount of internal memory, battery life, and response to after-sales service' are classified as one-dimensional factors. A critical finding of this paper is that since the results are different depending on the operating system of smartphones, it must be taken into consideration in studies on smartphones. The wide and rapid spread of smartphones has changed people's lifestyle as well as business environment, which forces companies to compete with each other to adapt to the changed circumstances. In this competitive system, studies on smartphone factors of satisfaction and dissatisfaction are essential for firms to establish a new strategy. From this point of view, the present paper is expected to be a basic material for enterprises not only to develop goods and services that maximize customer satisfaction and minimize dissatisfaction, but also to establish the future business strategy.