• Journal of the Korea Society of Computer and Information
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• v.16 no.2
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• pp.113-120
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• 2011

The information of the IT convergence has extended through the whole business ares with supplying intelligence terminal such as smart phone and the technology of sensors and wireless networks. And also, the existed industry became to high technology and extended various parts. The industry of the elevator became the center of the life offering the diversification of the user environment access and high building control. In this paper, we suggest the elevator control system integrated wire and wireless based on Information technology. We suggest the service model of user friendly connected by internet. For this, we make the relation model of the elevator system and IT environments and then design the service model for wire service and wireless service using smart phone. It can make to supply efficient information with wire and wireless environments and also make improvement in accessability for the disabled peoples.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.10
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• pp.2473-2481
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• 2014

The majority of next generation information systems will be working on portable mobile devices such as smartphones. REST Open API web services have quickly become popular among mobile application development. The use of REST web services are not only growing in popularity but totally changing the way of mobile applications development. This is because REST web services could be used in application development as a form of building blocks, which is completely independent, compatible, to any platforms. With this strength, REST web services encourage third party application to build add-on functionality. This research proposes the use of REST web service to replace the use of socket APIs into major internet communication APIs. To this end, this paper also provide performance evaluation of the REST web services compared to the conventional socket APIs, focusing on scalability by analytical and experimental evaluations. Finally, we summarize the possibility whether REST Open API web services have enough performance as future major internet communication primitive APIs.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.604-605
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• 2011

본 논문은 스마트그리드 환경에서 경제성 기반의 수요반응 효율을 얻기 위한 EMS 알고리즘 개발에 관한 것이다. EMS 시스템은 전력의 정확한 비용을 소비자에게 노출시킴으로써 전력 사용에 대한 소비자의 사용 패턴을 변화시키고 더 나아가 전력 자원을 효율적으로 배분하고자 한다. 경제성 수요반응은 전기요금의 시간대별 차등 책정을 특징으로 하며 개발된 EMS시스템은 RTP요금제를 바탕으로 실시간(RealTime), 양방향(Two-way), 상시(Economic)측면에서 전력회사와 소비자 모두에게 효율적인 인프라와 서비스를 제공하고자 개발되었다. 본 논문은 AMI기반 제주 수요반응 사업 과제로 개발된 EMS 시스템이며, 주택용(HEMS), 상가용(SMES), 빌딩용(BEMS)로 나누어 전력 소비자에 따른 EMS 알고리즘을 제시하고자 한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.17 no.4
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• pp.49-59
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• 2017

Smart sensing plays a key role in a variety of IoT applications, and its importance is growing more and more together with the development of artificial intelligence. Therefore the importance of smart sensors cannot be overemphasized. However, most studies related to smart sensors have been focusing on specific application purposes, for example, security, energy saving, monitoring, and there are not much effort on researches on how to efficiently configure various types of smart sensors to be needed in the future. In this paper, a component-based framework with hierarchical structure for efficient construction of smart sensor is proposed and its application to smart home is designed and implemented. The proposed method shows that various types of smart sensors to be appeared in the near future can be configured through the design and development of necessary components within the proposed software framework. In addition, since it has a layered architecture, the configuration of the smart sensor can be expanded by inserting the internal or external layers. In particular, it is possible to independently design the internal and external modules when designing an IoT application service through connection with the external device layer. A small-scale smart home system is designed and implemented using the proposed method, and a home cloud operating as an external layer, is further designed to accommodate and manage multiple smart homes. By developing and thus adding the components of each layer, it will be possible to efficiently extend the range of applications such as smart cars, smart buildings, smart factories an so on.

• Journal of Information Technology Services
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• v.11 no.sup
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• pp.41-50
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• 2012

With the recent advances in smart grid technologies and the increasing dissemination of smart meters, the power usage of each time unit can be detected in modern smart building environments. Thus, the utility company can adopt different price of electricity at each time slot considering the peak time. Korea government also announces the smart-grid roadmap that includes a law for realtime price of electricity. In this paper, we propose an efficient power scheduling scheme for smart buildings that adopt smart meters and real-time pricing of electricity. Our scheme dynamically changes the power mode of each consumer device according to the change of power rates. Specifically, we analyze the electricity demands and prices at each time, and then perform real-time power scheduling of consumer devices based on collaboration of each device. Experimental results show that the proposed scheme reduces the electricity charge of a smart building by up to 36.4%.

• KIPS Transactions on Computer and Communication Systems
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• v.5 no.5
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• pp.109-116
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• 2016

Today various IoT platforms exist, but most of them only consider IPv6, without other types of network including private network. They support, therefore, the private network to use virtual private network or through the hardware gateway. To solve this limitation, we propose a IoT platform that provides IoT Services on private networks. Also we verify this platform though constructing a testbed.

• Journal of the Korea Convergence Society
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• v.9 no.9
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• pp.191-197
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• 2018

With a population of more than 10 million people worldwide, MegaCity was only three in 1975, but it is expected to grow to 24 in 2013 and more than 30 in 2025 and more than 3 billion worldwide by 2050 It is expected to be absorbed into smart city. Especially in Asia and Africa, urbanization is expected to proceed rapidly. As the urbanization progresses and the population living in the cities increases, there are various problems such as rapid increase of energy consumption, congestion of traffic, various aging of the infrastructure and the like. As a result, smart city is emerging as a new alternative for solving urban problems. Smart City is rapidly expanding with the development of related technologies and can improve costs, improve urban services, improve quality of life, productivity and sustainability. Therefore, this paper analyzes the size and trend of the domestic and overseas smart city market, and analyzes the smart city related policies, trends and case studies of major countries to see the development status and market of smart city related industries, Present a business utilization model.

• Spatial Information Research
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• v.23 no.4
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• pp.47-56
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• 2015

Recently, there has been an increase in the number of people who use the smart-phone navigation for using various latest functions such as group driving and location sharing. But smart-phone has a limited storage space for one application, since a lot of applications with different purposes are installed in the smart-phone. For this reason, road network data with a large space of memory used for map matching in the device for navigation cannot be stored in the smart-phone for this reason map matching is impossible. Besides, smart-phone which doesn't use the external GPS device, provides inaccurate GPS information, compared to the device for navigation. This is why the smart-phone navigation is hard to provide accurate location determination. Therefore, this study aims to help map matching that is more accurate than the existing device for navigation, by reducing the capacity of road network data used in the device for navigation through format design of a new road network and conversion and using a database of driver's driving patterns. In conclusion, more accurate map matching was possible in the smart-phone by using a storage space more than 80% less than existing device at the intersection where many roads cross, the building forest that a lot of GPS errors occur, the narrow roads close to the highway. It is considered that more accurate location-based service would be available not only in the navigation but also in various applications using GPS information and map in the future Navigation.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.11
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• pp.2119-2124
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• 2016

The Internet of things (IoT) needs to be an event-driven approach for efficient related time response and processing. The growth of mobile devices in Internet of Things (IoT) leads to a number of intelligent buildings related IoT applications. For instance, home automation controlling system uses client system such web apps on smartphone or web service to access the home server by sending control commands. The gateway based RESTful technology responsible for handling clients'requests attests an internet latency in case a large number of clients' requests submit toward the gateway increases. In this paper, we propose the design tasks of the IoT gateway for handling concurrency events. The gateway based event-driven architecture is designed for building IoT gateway using node.js on one side and communication protocol based message-oriented middleware known as XMPP to handle communications of intelligent building control devices connected to the gateway through a centralized hub.

• Proceedings of the Korea Information Processing Society Conference
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• 2018.10a
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• pp.530-533
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• 2018

클라우드 컴퓨팅에 대한 관심이 높아지면서 클라우드 자원의 구성과 설정을 자동화하는 클라우드 오케스트레이션 기술 역시 각광받고 있다. 클라우드 오케스트레이션 기술을 활용하면 다수의 클라우드 자원을 수동적으로 생성하고 설정할 필요 없이 스트립트를 실행함으로써 자동화할 수 있어 많은 클라우드 이용자에게 확산되고 있다. 그러나 현재 클라우드 플랫폼에서 제공하는 클라우드 오케스트레이션 서비스들은 템플릿 스트립트를 수동적으로 작성해야 하며, 가상 머신의 성능이나 배포해야 할 어플리케이션 등 스크립트의 구성 요소들을 사용자가 직접 매핑하기 어렵다는 문제점을 가지고 있다. 본 논문에서는 사용자가 원하는 기능 및 비기능 요구사항을 반영하여 YAML 스크립트 파일을 자동으로 생성하고 이를 통해 클라우드 환경을 자동적으로 구축할 수 있는 오케스트레이션 시스템을 제안한다. 제안하는 시스템의 아키텍처와 프로세스를 제시하며, 본 방법을 클라우드 기반 스마트 빌딩 환경 구축에 적용하는 사례 연구를 진행하였다.