• KSII Transactions on Internet and Information Systems (TIIS)
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• 제5권6호
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• pp.1101-1112
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• 2011

The Multiuser Eigenmode Transmission (MET) has generated significant interests in literature due to its optimal performance in linear precoding systems. The MET can simultaneously transmit several spatial multiplexing eigenmodes to multiple users which significantly enhance the system performance. The maximum number of users that can be served simultaneously is limited due to the constraints on the number antennas, and thus an appropriate user selection is critical to the MET system. Various algorithms have been developed in previous works such as the enumerative search algorithm. However, the high complexities of these algorithms impede their applications in practice. In this paper, motivated by the necessity of an efficient and effective user selection algorithm, a low complexity recursive user selection algorithm is proposed for the MET system. In addition, the fairness of the MET system is improved by using the combination of the proposed user selection algorithm and the adaptive Proportional Fair Scheduling (PFS) algorithm. Extensive simulations are implemented to verify the efficiency and effectiveness of the proposed algorithm.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권10호
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• pp.4908-4922
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• 2019

The popularization of smartphones in recent years has created a rich ground for online-to-offline (O2O) services based on location information. In the process of finding user locations in O2O services, BLE (Bluetooth Low Energy) beacons are widely used because the beacons are economical in many ways. The current BLE method does not specify the direction of user movement, but adding that information could enrich the user experience for various O2O services. This paper proposes a method that identifies the user movement direction through data analysis on data sets generated by a pair of BLE beacons. Also we demonstrate its implementation with examples of services that need the direction information of users in order to show the feasibility of the method proposed.

• International Journal of Internet, Broadcasting and Communication
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• 제10권2호
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• pp.51-59
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• 2018

Health care has attracted a lot of attention, recently due to an increase in life expectancy and interest in health. Various biometric data of the user are collected by using the air pressure sensor, gyro sensor, acceleration sensor, and heart rate sensor to perform the Smart Health Care Activity Tracker function. Basically, smartphone application is made and tested for biometric data collection, but the Arduino platform and bio-signal measurement sensor are used to confirm the accuracy of the measured value of the smartphone. Use the Google Maps API to set user goals and provide guidance on the location of the user and the points the user wants. Also, the basic configuration of the main UI is composed of the screen of the camera, and it is possible for the user to confirm the forward while using the application, so that accident prevention is possible.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.2266-2270
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• 2005

In this paper, an internet based control application for dynamical systems is implemented. This implementation is maily targeted for the part of advanced control education. Intelligent control algorithms are implemented in a PC so that a client can remotely access the PC to control a dynamical system through the internet. Neural network is used as an on-line intelligent controller. To have on-line learning and control capability, the reference compensation technique is implemented as intelligent control hardware of combining a DSP board and an FPGA chip. GUIs for a user are also developed for the user's convenience. Actual experiments of motion control of a DC motor have been conducted to show the performance of the intelligent control though the internet and the feasibility of advanced control education.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2000년도 추계학술대회 논문집
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• pp.140-143
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• 2000

This research presents new type of remote monitoring and control solution of PLC that can be used bi-directional and efficient management of factory automation through internet. This system has client/server architect for information handling between PLC and remote computer where a user can control and monitor target PLC. Actually the authors redirect RS232C connection between PLC and server computer into Internet connection between PLC and remote client computer using supplied PLC tool program So user feel like in front of PLC panel when he operates remote PLC through Internet. Each client/server program is constructed with Java language for security. In this paper the internet-based remote control system was proposed and proved validity by being applied to redirection of PLC control for factory automation.

• 한국컴퓨터정보학회논문지
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• 제10권1호
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• pp.189-199
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• 2005

기술은 다양한 차원에서 잠재적 용도를 가지고 있고, 그것을 둘러싼 사회적 맥락에 의해 끊임없이 변화한다. 따라서 기술이라는 인공물의 내적 논리체계에는 정치적 함의가 투영되어 있다고 할 수 있다. 이것은 인터넷 규제기술에도 동일하게 맥락화 될 수 있는데. 어떠한 기술이 채택되느냐에 따라서 정보통제권 관계는 매우 가변적이다. 본 논문은 인터넷 내용등급제를 사례로 이용자 정보통제권에 정합하는 인터넷 규제기술 구조와 원리 및 그 사회적 함의를 고찰한다

• Asia pacific journal of information systems
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• 제13권3호
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• pp.195-211
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• 2003

The technology acceptance model(TAM) has been widely studied in IS research in order to gain a better understanding of the adoption and use of information systems. Based on the TAM, we explored acceptance of internet shopping mall. 261 questionaries were collected and analyzed. The results of this study showed that the internet shopping mall characteristics such as information quality, system design quality, and communication are important factors in affecting user's visiting and buying frequency at the internet shopping mall. Therefore, the internet shopping mall providers should make the product's information more informative and design shopping mall sites more effectively and interactively.

• Journal of Information Technology Applications and Management
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• 제14권3호
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• pp.15-48
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• 2007

As the mobile Internet spreads around the globe, a cross-national difference in the use of mobile services has become an important issue. The goal of this study is to propose and verity cross-national differences in the effect of each value-type on user satisfaction with the mobile Internet. We propose an analytic framework of four different types of value and apply this model to the value structures of mobile Internet users in two different countries. Large-scale online surveys were conducted in Korea and Hong Kong simultaneously with the same questionnaire. Results show that the relationships between the value components and user satisfaction varied between the two countries.

• 정보학연구
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• 제3권3호
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• pp.67-76
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• 2000

인터넷 이용자는 Off-Line에서만 중요한 Target market이 되는 것은 아니다. 전자상거래의 활성화와 함께 인터넷 이용자는 On-Line상에서 핵심 Target market가 되었다. 따라서 이들의 구매성향을 정확히 분석하여 최적의 마케팅 기법을 개발하는 것이 기업의 당면과제로 떠올랐다. 본 연구에서는 친구통계학적 방법을 사용하여 인터넷 이용자의 구매행동을 분석하고, 이에 따른 최적의 인터넷 광고를 어떻게 행할 수 있는가 하는 것에 관하여 고찰해 보았다. .

• 공학논문집
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• 제4권1호
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• pp.23-33
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• 2002

인터넷의 빠른 발전으로 인터넷은 무선 인터넷이라는 형태로 거듭 발전하고 있다. 그러나 많은 기업의 무선인터넷 보급에도 불구하고 사용자는 극소수에 이른다. 무선 인터넷의 더 빠른 보급을 위해 학생이라면 꼭 사용해야하는 학사정보 시스템을 구축하여 대학에서부터 그 혁명을 이끌어 가고 무선이라는 특수성을 이용하여 시간적 공간적 제약을 없애 학생들의 학사 편의에 그 목적을 가진다.