• 한국전자거래학회지
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• 제20권1호
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• pp.167-182
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• 2015

고령자, 장애인의 삶의 질을 유지시키기 위한 방법 중 하나로 주목받고 있는 미래의 주거 형태인 스마트 홈은 인간 생활 전반을 지원하기 위한 다양한 기능적 공간이 융합된 곳으로서, 삶의 질에 크게 영향을 끼칠 잠재력을 가진 공간이다. 따라서 삶의 공간에서 만족도를 높이기 위해 사용자의 실제 니즈를 반영하는 것이 매우 중요하며, 스마트 홈 내의 사용자 가치에 대한 연구는 활발히 이루어져 왔다. 그러나 광범위한 스마트 홈 서비스를 명확히 분류하고 서비스 특성에 따라 요구되는 사용자 가치를 제시한 연구는 아직 부족한 실정이다. 이에 본 연구는 스마트 홈 서비스를 사용자 관점에서 분류하고, 서비스의 특성에 따라 요구되는 사용자 가치를 규명하는 것을 목적으로 하였다. 이를 위해 문헌 연구를 통하여 사용자 중심적 관점에서 스마트 홈을 정의하고 이를 토대로 스마트 홈의 기능 및 서비스 분류 체계를 수립하였다. 또한 스마트 홈 서비스의 기술, 서비스 영역에서의 사용자 요구가치를 도출하고, 앞서 수립된 서비스 분류 체계와의 연관관계를 도출하였다. 본 연구를 통해 추후 스마트 홈 서비스 개발에 있어서 사용자에 대한 더 깊은 이해가 가능하도록 도울 수 있다는 의의가 있다.

• 한국산업정보학회논문지
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• 제16권5호
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• pp.55-62
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• 2011

최근 스마트 폰 보급 확대에 의해 위치기반 서비스(LBS)의 범위는 점점 더 확장되고 있고 서비스 또한 고속 이동 통신을 기반으로 매우 개인화되고 다양해지고 있다. 그 중에 위치기반 소셜 네트워크 서비스(LBSNS)는 스마트 폰 등장 이후에 가장 성장성이 기대되는 서비스이다. 본 논문은 스마트 폰의 위치에 기반하여 적응적으로 변화되는 커뮤니티를 형성하는 모델을 연구하고, 형성된 커뮤니티에 대한 적절한 관리와 형성된 커뮤니티 내의 멤버를 자동적으로 추가하거나 삭제할 수 있는 기능을 제공하는 LBSNS 서비스 모델을 제시한다. 또한, 향후 모바일 환경에서 위치기반 소셜 네트워크 서비스의 의미있는 연구방향을 기술한다.

• 한국인터넷방송통신학회논문지
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• 제20권1호
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• pp.187-192
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• 2020

IoT 기반 피트니스 헬스케어 시스템을 이용하면 실내외에서 정확한 운동량을 측정하고 언제 어느 곳에서나 스마트폰으로 필요한 운동정보에 대한 푸시메시지를 받을 수 있고 검색이 가능하여 매우 편리하다. 이 시스템은 운동기구에 있는 센싱장치를 포함한 IoT 모듈, IoT 게이트웨이, 스마트폰, 스마트밴드 및 서버 등이 인터넷으로 연동하게 된다. 본 논문에서는 이와 같은 "IoT 기반 피트니스 헬스케어 시스템"의 소프트웨어를 개발하는데 있어 객체지향 분석 방법인 UML을 이용한 소프트웨어 개발 분석 방법과 플로우차트 및 UI 설계 같은 설계 방법을 보여줌으로써 실무 개발에 적합한 분석/설계 방법을 제시하고자 한다.

• 한국멀티미디어학회논문지
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• 제16권5호
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• pp.566-576
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• 2013

In Home Area Network (HAN) of the smart grid, Power Line Communication (PLC) technology and ZigBee communication technology can be used in the communication among the Advanced Metering Infrastructure (AMI) devices. However, according to performance evaluation results of the PLC technology, we find that using the PLC technology is unsuitable for the remote meter reading service. It is worth noting that some parts of the PLC are converted to the ZigBee communication technology in Jeju, Korea. Compared with PLC, ZigBee has no restriction of the place, where the equipments can be freely set up, due to the advantage of radio communication. However, number of usable devices will impact the network performance which is depended on the address assignment. In addition, due to the restriction of transmission range among devices, it is difficult to apply the ZigBee address assignment method to the practical circumstance. In this paper, we examine the previous ZigBee address assignment schemes and the corresponding routing algorithms, and propose a novel address assignment scheme compared with the existing methods, the performance of the proposed one is improved. In particular, evaluation results show that the proposed scheme reduces the average number of hop count, the transfer time and the processing time.

• The Journal of Asian Finance, Economics and Business
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• 제7권10호
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• pp.323-328
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• 2020

This study aims to analyze the changes in purchasing decisions in conducting transactions using cash and digital payment systems. Cash payment systems are very different from digital payments because they no longer use banks as intermediaries for transactions. The scope of this study is to determine the differences that take place with purchasing decisions using digital payment systems with OVO Indonesia smart applications. By using the paired T-test sample test method and testing the regression class assumptions, it is expected we will document the comparison between cash and digital payment systems as regards changes in consumers' buying interest behavior towards goods. Data is obtained by purposive sampling using special characteristics for smart application users. The results show that digital payments are developing very quickly, but cash payments still dominate due to the unavailability of complete facilities and infrastructure to support digital payment systems other than in cities. This study illustrates that digital payments have not been able to completely change consumer buying behavior in large numbers, but the main finding in this study is an increase in the percentage of digital payment usage to the online market, due to the many conveniences provided in OVO smart applications.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2017년도 춘계학술대회
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• pp.575-576
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• 2017

최근 스마트게이트웨이가 연구됨에 따라 빅 데이터와 IoT(Internet of Things)를 통해 부가적인 서비스를 제공할 수 있다. 그러나 기존 시스템은 연결되는 기기의 수가 증가함에 따라 네트워크의 안정성이 저하되며 데이터 보안이 취약한 문제점이 있었다. 본 논문에서는 이러한 문제점을 해결하기 위해 IoT 기반 스마트 게이트웨이 VPN 터널링 제어 시스템을 설계한다. 공유기 수준의 저사양의 타겟에 효율적인 VPN 터널링 기술과 인터넷 회선품질의 변화가 심한 환경에서 실시간에 효율적으로 트래픽을 제어하는 방법을 제시하여 원격지에서 VPN을 통해 안전하게 댁내의 센서 제어가 가능하도록 한다.

• ETRI Journal
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• 제28권3호
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• pp.320-328
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• 2006

Using biometrics to verify a person's identity has several advantages over the present practice of personal identification numbers (PINs) and passwords. To gain maximum security in a verification system using biometrics, the computation of the verification as well as the storing of the biometric pattern has to take place in a smart card. However, there is an open issue of integrating biometrics into a smart card because of its limited resources (processing power and memory space). In this paper, we propose a speaker verification algorithm using a support vector machine (SVM) with a very few features, and implemented it on a 32-bit smart card. The proposed algorithm can reduce the required memory space by a factor of more than 100 and can be executed in real-time. Also, we propose a hardware design for the algorithm on a field-programmable gate array (FPGA)-based platform. Based on the experimental results, our SVM solution can provide superior performance over typical speaker verification solutions. Furthermore, our FPGA-based solution can achieve a speed-up of 50 times over a software-based solution.

• Journal of Information Processing Systems
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• 제15권2호
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• pp.440-448
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• 2019

The Internet of Things (IoT) is one of the main enablers for situation awareness needed in accomplishing smart cities. IoT devices, especially for monitoring purposes, have stringent timing requirements which may not be met by cloud computing. This deficiency of cloud computing can be overcome by fog computing for which fog nodes are placed close to IoT devices. Because of low capabilities of fog nodes compared to cloud data centers, fog nodes may not be deployed with all the services required by IoT devices. Thus, in this article, we focus on the issue of fog service placement and present the recent research trends in this issue. Most of the literature on fog service placement deals with determining an appropriate fog node satisfying the various requirements like delay from the perspective of one or more service requests. In this article, we aim to effectively place fog services in accordance with the pre-obtained service demands, which may have been collected during the prior time interval, instead of on-demand service placement for one or more service requests. The concept of the logical fog network is newly presented for the sake of the scalability of fog service placement in a large-scale smart city. The logical fog network is formed in a tree topology rooted at the cloud data center. Based on the logical fog network, a service placement approach is proposed so that services can be placed on fog nodes in a resource-effective way.

• 드라이브 ㆍ 컨트롤
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• 제18권1호
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• pp.9-16
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• 2021

Overloaded vehicles increase the maintenance cost of road structures, and they are a major factor in causing damage to the roads and bridges. In addition, overloaded vehicles compromise the braking capability of the vehicle; thus, threatening the safety of the driver. In order to prevent overloading of vehicles, the government is cracking down on the roads by using a device that measures the weight of vehicles. But this process is inconvenient because the place where the equipment is installed is far away from where the cargo is loaded. Due to the limitations of these fixed weighing devices, there is a growing need for technology that can monitor vehicle weight distribution and overload conditions in real time. In this work, we develop an onboard scale that can measure the load (weight) of trucks in real time. The onboard scale consists of high sensors, a signal processing unit, and a display, and it measures the load using height-displacement of the vehicle's leaf spring suspension.

• Current Applied Physics
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• 제18권11호
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• pp.1313-1319
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• 2018

The coil-to-globule behavior of poly{${\gamma}$-2-[2-(2methoxyethoxy)ethoxy]ethoxy-3-caprolactone} (PMEEECL) as a ${\gamma}$-substituted poly (${\varepsilon}$-caprolactone) was investigated via atomistic molecular dynamics (MD) simulation. For this purpose, radius of gyration, end-to-end distance and radial distribution function of the chain in the presence of water were calculated. Consequently, the lower critical solution temperature (LCST) of PMEEECL chain at which the coil-to-globule transition takes place, was determined in each calculated parameter curve. The simulation results indicated that the LCST of PMEEECL was occurred at close to 320 K, which is in a good agreement with previous experimental results. Additionally, the appearance of sudden change in both Flory-Huggins interaction parameter (${\chi}$) and interaction energy between the PMEEECL chain and water molecules at about 320 K confirmed the calculated LCST result. The radial distribution function (RDF) results showed that the affinity of the PMEEECL side chain to water molecules is lower than its backbone.