• Journal of Nutrition and Health
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• 제47권5호
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• pp.374-384
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• 2014

Purpose: Health professionals and policy makers confront the failure of provider-administered, conventional behavioral interventions in the fight against obesity epidemic. The aim of this study was to develop a tailored, cost-effective delivery system for a child obesity prevention and management program through technology convergence using Web-enabled smart cellular phones. Methods: Assessment of service needs and development of a delivery system for the program were based on a comprehensive literature review and expert reviews, and results from in-depth interviews and a need-assessment survey. Results: The user- and site-centered service delivery system using Web-enabled cellular telephones as the hardware platform for obesity prevention and management has been developed. A tailored informational service and intervention will be provided interactively between stakeholders through the platform. The potential legal issues associated with the service design have also been considered. Conclusion: The user-centered convergence design and platform based on principles of Transtheoretical Model and Stages of Change using the Health Promoting School framework could enable effective intervention and promote acceptance in the long-run.

• 한국정보통신학회논문지
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• 제20권8호
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• pp.1524-1530
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• 2016

최근 스마트 기기를 이용한 전자 출결 시스템에 대한 연구가 활발히 진행되고 있다. 전자 출결 시스템을 이용하여 교수는 실시간으로 학생들의 출결 처리와 출석 기록을 관리할 수 있다. 본 논문에서는 기존의 자동식별 및 데이터 획득(AIDC, Automatic Identification and Data Capture) 기반의 전자 출결 시스템의 한계점인 공간적, 시간적, 비용적 문제점을 해결할 수 있는 전자 출결 시스템을 제안하였다. 제안하는 시스템은 웹 서버로 동작하며 HTML5(Hyper Text Markup Language ver.5) 기반으로 작성된 출결 관리 페이지에 개인이 가진 스마트 기기를 통한 접속한 후 서버-클라이언트 이미지 데이터 전송 기술을 이용하여 실시간 전자 출결이 가능한 장점이 있다. 또한 제안 시스템은 파이썬 플라스크 프레임워크를 기반으로 동작하기 때문에 운영체제에 상관없이 설치 및 운용이 가능한 장점을 가진다.

• Journal of Communications and Networks
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• 제7권2호
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• pp.144-156
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• 2005

Video streaming over wireless networks is challenging due to node mobility and high channel error rate. In this paper, we propose a multi-source video streaming (MUVIS) system to support high quality video streaming service over IEEE 802.1l-based wireless networks. We begin by collocating a streaming proxy with the wireless access point to help leverage both the media server and peers in the WLAN. By tracking the peer mobility patterns and performing content discovery among peers, we construct a multi-source sender group and stream video using a rate-distortion optimized scheme. We formulate such a multi-source streaming scenario as a combinatorial packet scheduling problem and introduce the concept of asynchronous clocks to decouple the problem into three steps. First, we decide the membership of the multisource sender group based on the mobility pattern tracking, available video content in each peer and the bandwidth each peer allocates to the multi-source streaming service. Then, we select one sender from the sender group in each optimization instance using asynchronous clocks. Finally, we apply the point-to-point rate-distortion optimization framework between the selected sender-receiver pair. In addition, we implement two different caching strategies, simple caching simple fetching (SCSF) and distortion minimized smart caching (DMSC), in the proxy to investigate the effect of caching on the streaming performance. To design more realistic simulation models, we use the empirical results from corporate wireless networks to generate node mobility. Simulation results show that our proposed multi-source streaming scheme has better performance than the traditional server-only streaming scheme and that proxy-based caching can potentially improve video streaming performance.

• Smart Structures and Systems
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• 제26권4호
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• pp.481-493
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• 2020

The negative stiffness spring and inerter are both characterized by the negative stiffness effect in the force-displacement relationship, potentially yielding an amplifying mechanism for dashpot deformation by being incorporated with a series tuning spring. However, resisting forces of the two mechanical elements are dominant in different frequency domains, thus leading to necessary complementarity in terms of vibration control and the amplifying benefit. Inspired by this, this study proposes a Negative Stiffness Inerter System (NSIS) as an earthquake protection system and developed analytical design formulae by fully utilizing its advantageous features. The NSIS is composed of a sub-configuration of a negative stiffness spring and an inerter in parallel, connected to a tuning spring in series. First, closed-form displacement responses are derived for the NSIS structure, and a stability analysis is conducted to limit the feasible domains of NSIS parameters. Then, the dual advantageous features of displacement reduction and the dashpot deformation amplification effect are revealed and clarified in a parametric analysis, stimulating the establishment of a displacement-based optimal design framework, correspondingly yielding the design formulae in analytical form. Finally, a series of examples are illustrated to validate the derived formulae. In this study, it is confirmed that the synergistic incorporation of the negative stiffness spring and the inerter has significant energy dissipation efficiency in a wide frequency band and an enhanced control effect in terms of the displacement and shear force responses. The developed displacement-based design strategy is suitable to utilize the dual benefits of the NSIS, which can be accurately implemented by the analytical design formulae to satisfy the target vibration control with increased energy dissipation efficiency.

• 한국환경복원기술학회지
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• 제21권1호
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• pp.55-71
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• 2018

To improve the ecological function of urban areas, the guideline for applying the Biotope Area Ratio to the Environmental Impact Assessment (EIA) was developed in 2005 and modified in the July, 2017. This study investigates whether the guideline has been actually practiced in the real world by searching reports including 648 cases of the Strategic Environmental Impact Assessment (SEIA) and 471 cases of the EIA. The results show that the 38% of SEIA and the 43% of EIA include sections about Biotope Area Ratio, and the 15% of SEIA and the 25 % of EIA are satisfied the threshold of the Biotope Area Ratio suggested by the guideline. The statistical analysis results show that this low level of practice was not improved through the modification of the guideline in 2017. This is because the guideline is forcibleness, its explanation is unclear, and stockholders' understanding of it lacks. In addition, lack of tracking management on SEIA and EIA also contributes to the low level of practice of the guideline. To promote the practice, the efforts to legislate and publicize the guideline are required.

• Journal of Communications and Networks
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• 제13권6호
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• pp.552-566
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• 2011

The Internet is a very successful modern technology and is considered to be one of the most important means of communication. Despite that success, fundamental architectural and business limitations exist in the Internet's design. Among these limitations, we focus on a specific issue, the lack of manageability, in this paper. Although it is generally understood that management is a significant and important part of network and service design, it has not been considered as an integral part in their design phase. We address this problem with our future Internet management architecture called highly manageable network and service architecture for new generation (HiMang), which is a novel architecture that aims at integrating management capabilities into network and service design. HiMang is highly manageable in the sense that it is autonomous, scalable, robust, and evolutionary while reducing the complexity of network management. Unlike any other management framework, HiMang provides management support for the revolutionary networks of the future while maintaining backward compatibility for existing networks.

• 한국컴퓨터정보학회논문지
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• 제18권3호
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• pp.69-77
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• 2013

본 연구에서는 관람 전 사용자 평가를 통해 박물관 모바일 애플리케이션의 정보서비스에 대한 만족도를 비교하고, 사용성과 기능적 특성간의 상관관계를 검증했다. 빌바오 구겐하임과 미국자연사박물관 애플리케이션의 경우, 정보서비스와 기능적 특성에 대한 만족도, 관람 동기와 관람시 애플리케이션 사용에 대해 반응이 모두 높게 나타났다. 이는 사용자의 관심과 욕구를 반영될 수 있도록 모바일 애플리케이션이 직관적으로 설계 및 디자인되고, 감성적 인터페이스를 지향할 때 사용성이 상승된다는 것을 의미한다. 또한 사용성과 기능적 특성과의 상관관계를 분석한 결과, 비간섭적 특성과 개인화적 특성이 다른 기능적 특성에 비해 좀 더 유의미한 상관관계에 놓여 있었다. 본 연구를 통해 도출된 하나의 중요한 시사점은 모바일 해석 매체의 사용성은 엔터테인먼트적인 요소나 기술적 적용보다는 콘텐츠와 사용자 사이에서 발생하는 인터랙션과 사용자의 관심과 욕구가 반영될 수 있는 기능적 특성에 따라 좌우 된다는 것이다.

• Smart Structures and Systems
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• 제16권3호
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• pp.415-433
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• 2015

Tendon failures in bonded post-tensioned bridges over the last two decades have motivated ongoing investigations on various aspects of unbonded tendons and their monitoring methods. Recent research shows that change of strain distribution in anchor heads can be useful in detecting wire breakage in unbonded construction. Based on this strain variation, this paper develops a damage detection model that enables an automated tendon monitoring system to identify and locate wire breaks. The first part of this paper presents an experimental program conducted to study the strain variation in anchor heads by generating wire breaks using a mechanical device. The program comprised three sets of tests with fully populated 19-strand anchor head and evaluated the levels of strain variation with number of wire breaks in different strands. The sensitivity of strain variation with wire breaks in circumferential and radial directions of anchor head in addition to the axial direction (parallel to the strand) were investigated and the measured axial strains were found to be the most sensitive. The second part of the paper focuses on formulating the wire breakage detection framework. A finite element model of the anchorage assembly was created to demonstrate the algorithm as well as to investigate the asymmetric strain distribution observed in experimental results. In addition, as almost inevitably encountered during tendon stressing, the effects of differential wedge seating on the proposed model have been analyzed. A sensitivity analysis has been performed at the end to assess the robustness of the model with random measurement errors.

• Smart Structures and Systems
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• 제5권2호
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• pp.153-171
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• 2009

In this paper, the analytical fault detection and diagnosis (FDD) is presented using model-based and signal-based methodology with wavelet analysis on signals obtained from sensors and sensor networks. In the model-based FDD, we present the modeling of contact interface found in soft materials, including the biomedical contacts. Fingerprint analysis and signal-based FDD are also presented with an experimental framework consisting of a mechanical pneumatic system typically found in manufacturing automation. This diagnosis system focuses on the signal-based approach which employs multi-resolution wavelet decomposition of various sensor signals such as pressure, flow rate, etc., to determine leak configuration. Pattern recognition technique and analytical vectorized maps are developed to diagnose an unknown leakage based on the established FDD information using the affine mapping. Experimental studies and analysis are presented to illustrate the FDD methodology. Both model-based and wavelet-based FDD applied in contact interface and manufacturing automation have implication towards better quality of life by applying theory and practice to understand how effective diagnosis can be made using intelligent FDD. As an illustration, a model-based contact surface technology an benefit the diabetes with the detection of abnormal contact patterns that may result in ulceration if not detected and treated in time, thus, improving the quality of life of the patients. Ultimately, effective diagnosis using FDD with wavelet analysis, whether it is employed in biomedical applications or manufacturing automation, can have impacts on improving our quality of life.

• The Journal of Asian Finance, Economics and Business
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• 제7권8호
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• pp.425-433
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• 2020

This paper aims to develop a conceptual framework for evaluating the impact of motivational factors on the work results of lecturers at Vietnam National University, Hanoi (VNU), one of two leading multidisciplinary and multi-sectoral national universities in Vietnam. This study has considered wages and other benefits (WB), training and development (TD), working environment (WE) and working motivation (WM) as motivational factors, and proposed a structural model of the impact of motivational factors on the work results of lecturers at VNU. The empirical analysis used data from the survey data of 321 university lecturers. Comprehensive, valid, and reliable tools (SPSS 26 and SmartPLS 3.0 software) are used to evaluate rigorous statistical tests including convergence validity, discriminatory validity, reliability, and average variance extracted to analyze and verify the gathered data, and the hypotheses developed. The result of path analysis shows that four motivational factors constitute a structured system with different degrees of influence on the work results of lecturers. There is also a positive relationship between the motivational factors and the work results of lecturers. As a result, it can be concluded that all hypotheses developed are supported. Several recommendations are further suggested to improve the performance of lecturers at VNU.