• 전자공학회논문지SC
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• 제41권2호
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• pp.9-16
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• 2004

산업이 발전되어감에 따라 일반 가정에서 산업의 각 분야에 이르기까지 각종 전동기의 사용이 증가하고 있으며, 그 종류도 날로 다양해지고 있다. 이러한 이유로 산업전반에 널리 보급된 인터넷을 이용하여, 가변속 구동 시스템에 대해 원격조작하고, 일괄 관리하거나 실시간으로 관리기기의 상태를 파악하고, 데이터를 수집, 처리하는 것이 요구된다. 또한 인터넷을 통해 기기를 직접 제어, 관리함으로써 시간과 공간, 비용절감의 측면에서 큰 효과를 기대 할 수 있다. 따라서 본 논문에서는 인터넷 웹 기반의 PMSM 원격제어시스템 개발을 연구하였다. 인터넷을 이용한 원격제어를 위해 DSP 제어기 및 TCP/IP를 사용한 클라이언트/서버 시스템과 PMSM의 상태와 Data를 확인할 수 있는 웹 인터페이스를 개발하였다. 이 시스템은 웹 기반의 관리 프로그램을 통해 실시간으로 PMSM의 기동, 정지 및 가변속에 대한 제어와 모니터링이 가능하다.

• 제어로봇시스템학회논문지
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• 제9권4호
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• pp.340-346
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• 2003

Driven by the growth of the Internet and the increasing ubiquity of embedded computing systems, the embedded system is exploding in terms of it proliferation of products and the number of complex applications. Intelligent dedicated systems and appliances used in interface, monitoring, communications, and control applications increasingly demand the services of a sophisticated, state-of-the-art operating system. In the case of industrial controller, it is required to use a real-time operating system (RTOS) as a good building block to enable Internet connectivity. However, commercial RTOSes are increasingly less desirable due to their lack of standardization and their inability to keep pace with the rapid evolution of technology. In order to overcome these problems, we consider using embedded Linux and embedded web server. Availability of source code, reduced licensing, reliability, open source community support, as well as others, are key reasons for the use of embedded linux by embedded developers. In this paper, we develop embedded linux platform to control the industrial inverter with the Internet connecting feature. The method of web-based management is also proposed by using the embedded web server and Java applet. We show the feasibility of remote management for the commercial inverter controller with the proposed three-tier web-based remote management system.

• 대한간호학회지
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• 제35권5호
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• pp.924-930
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• 2005

Purpose: The purpose of this study was to evaluate the effect of web-based diabetic education on plasma glucose and serum lipids in obese people with diabetes. Method: A random allocation design with control and experimental groups being assessed pre- and post-intervention was used. Eighteen patients were randomly allocated to an intervention group and 16 to a control group. Participants were requested to input their blood glucose levels weekly for 3 months at http://www.biodang.com by cellular phone or wire Internet. The researcher sentoptimal recommendations to each patient weekly for 3 months using a short message service (SMS) of the cellular phone and wire Internet. Results: Patients in the intervention group had a mean decrease of $1.2\%$ in glycosylated haemoglobin ($HbA_{1}c$) levels and those in the control group had no difference in HbA1c levels. There was a significant mean change in 2-hour post prandial blood glucose (2HPPG) for the intervention group, with a mean change of -120.1 mg/dl. The mean change in the control group, however, was not significant. Conclusion: These findings indicate that this web-based intervention using SMS of the cellular phone for 3 months improved $HbA_{1}c$ and 2HPPG, but did not affect total cholesterol, triglyceride, and high density lipoprotein cholesterol in obese type 2 diabetic patient.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권12호
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• pp.4385-4399
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• 2021

The Internet of Things (IoT) eHealth systems composed by Wireless Body Area Network (WBAN) has emerged recently. Sensor nodes are placed around or in the human body to collect physiological data. WBAN has many different applications, for instance health monitoring. Since the limitation of the size of the battery, besides speed, reliability, and accuracy; design of WBAN protocols should consider the energy efficiency and time delay. To solve these problems, this paper adopt the end-edge-cloud orchestrated network architecture and propose a transmission based on reinforcement algorithm. The priority of sensing data is classified according to certain application. System utility function is modeled according to the channel factors, the energy utility, and successful transmission conditions. The optimization problem is mapped to Q-learning model. Following this online power control protocol, the energy level of both the senor to coordinator, and coordinator to edge server can be modified according to the current channel condition. The network performance is evaluated by simulation. The results show that the proposed power control protocol has higher system energy efficiency, delivery ratio, and throughput.

• 한국멀티미디어학회논문지
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• 제6권3호
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• pp.496-507
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• 2003

인터넷 트래픽 양의 급격한 증가는 우수한 네트워킹 기술을 가지는 IP 프로토콜을 요구한다. 그러므로, 인터넷은 다양한 새로운 어플리케이션에 필수적으로 요구되는 QoS를 위해 최선형 서비스에서 차등화 서비스 프레임워크로 전개되고 있다. 또한 QoS 기반의 높은 대역폭의 인터넷 요구는, 몇 년 내에 DWDM기반의 광 인터넷으로 전송망이 재편되리라 예상된다. 본 논문에서는 차세대 인터넷을 위한 DWDM광 인터넷 망에 대한 QoS 제공 측면, 제어 프로토콜 측면, 백본망 구조 측면 및 교환기술 측면에 대해 효과적인 구현 방안을 제시한다.

• 지역사회간호학회지
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• 제17권3호
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• pp.354-363
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• 2006

Purpose: The Purpose of this study was to determine the effect of an internet games addiction prevention program on middle school students' depression, self esteem and Internet games addiction. Methods: The internet games addiction prevention program in this study was based on the Ellis'(1962) ABC Model. This research adopted the non-equivalent control group pretest-posttest design. and was conducted with 52 middle school students who were selected through convenient sampling and assigned to an experimental group or a control group. Data were collected from January 15, 2006 to February 19, 2006, and analyzed using the SPSS/PC program by frequency, Fisher exact test, t-test, means, standard deviations and ANCOVA. Results: The results of the experiment supported the hypothesis that the experimental group would have lower depression scores and internet games addiction scores and higher self-esteem scores than the control group. Conclusions: After 8 sessions of the internet games addiction prevention program, it was found that the program was effective to improve the score of self-esteem and reduces the scores of internet games addiction and depression.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제18권6호
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• pp.1599-1618
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• 2024

Access control has always been one of the effective methods to protect data security. However, in new computing environments such as big data, data resources have the characteristics of distributed cross-domain sharing, massive and dynamic. Traditional access control mechanisms are difficult to meet the security needs. This paper proposes CACM-MMSR to solve distributed cross-domain access control problem for massive resources. The method uses blockchain and smart contracts as a link between different security domains. A permission decision model migration method based on access control logs is designed. It can realize the migration of historical policy to solve the problems of access control heterogeneity among different security domains and the updating of the old and new policies in the same security domain. Meanwhile, a semantic reasoning-based permission decision method for unstructured text data is designed. It can achieve a flexible permission decision by similarity thresholding. Experimental results show that the proposed method can reduce the decision time cost of distributed access control to less than 28.7% of a single node. The permission decision model migration method has a high decision accuracy of 97.4%. The semantic reasoning-based permission decision method is optimal to other reference methods in vectorization and index time cost.

• 여성건강간호학회지
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• 제10권4호
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• pp.311-317
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• 2004

Purpose: The purpose of this study was to evaluate the effects of Internet education on plasma glucose and serum lipids in female type 2 diabetic patients. Method: Control and experimental groups were assessed by a pre-test and at 3 months, 6 months, 9 months, and 12 months. Fourteen patients were assigned randomly to an intervention group and 15 to a control group. Patients in the intervention group were requested to input their blood glucose levels everyday by cellular phone or wire Internet for 1 year. The goal of the intervention was to keep blood glucose concentrations close to the normal range (glycosylated hemoglobin, HbA1c<7%). An intervention was applied to the intervention group weekly for 1 year. Optimal recommendations were sent weekly by a short message service from a cellular phone and wire Internet. Results: Patients in the intervention group had a significant mean change in HbA1c, from 7.6% at pre-test to 6.9%, at 3 months and equalized at 6.7% at 12 months. There was no significant time and group differences observed in the serum lipids. Conclusion: These findings indicate that Internet education would improve and maintain the normal range of HbA1c in female type 2 diabetic patients.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권10호
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• pp.2587-2600
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• 2012

It has been demonstrated that choosing an appropriate relay node can improve the transmission rate for the system. However, such system improvement brought by the relay selection may be degraded with the presence of the malicious relay nodes, which are selected but refuse to cooperate for transmissions deliberately. In this paper, we formulate the relay selection issue as a restless bandit problem with the objective to maximize the average rate, while considering the credibility of each relay node, which may be different at each time instant. Then the optimization problem is solved by using the priority-index heuristic method effectively. Furthermore, a low complexity algorithm is offered in order to facilitate the practical implementations. Simulation results are conducted to demonstrate the effectiveness of the proposed trust-based relay selection scheme.

• 한국인터넷방송통신학회논문지
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• 제14권3호
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• pp.147-153
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• 2014

본 논문에서는 안드로이드 플랫폼 기반의 스마트 감성조명 제어 시스템을 제안한다. 제안된 스마트 감성조명제어 시스템은 안드로이드 플랫폼, 감성조명 장치, 확장 디바이스와 지그비 모듈을 사용하였다. 안드로이드 플랫폼 기반의 스마트 감성조명 제어 시스템은 조도센서를 이용하여 자동제어와 수동제어 선택이 가능하며, 원하는 조명만을 선택하여 부분적인 제어도 가능하게 설계하였다. 제안된 스마트 감성조명 제어 시스템의 실험 결과 필요로 하는 부분의 조명기기 제어와 색온도 가변에 의한 제어가 가능하였고, 감성어휘에 의한 가변점등으로 효율적으로 기존 감성조명 제어 시스템보다 전력 소비를 감소시켰다. 그리고 상황에 적합한 색상과 밝기를 제어하여 사무실에서 행위를 함에 있어 집중력과 업무능력 향상에도 효과적인 제어가 가능하였다.