• Proceedings of the Korea Information Processing Society Conference
• /
• 2012.04a
• /
• pp.60-61
• /
• 2012

D2D는 단말 디바이스간의 중간의 매개체 없이 직접 연결을 통해서 메시지나 컨텐츠 등을 전송하는 시스템으로서 이의 개발에는 동시에 두개 이상의 단말을 연결하여 직접 통신을 수행하고 그 결과를 확인하는 테스팅 기능이 요구된다. 기존의 일반적인 테스팅 환경은 하나의 단말에서 구현되는 응용이나 서비스의 구현을 테스팅하는데 집중되어 있으나 본 연구에서는 다수개의 단말을 연결하여 테스트할 수 있는 간이 테스팅 프레임워크를 구축하고자 한다. 이를 위하여 간단한 테스트 스크립트 엔진을 설계하였고 테스트 스크립트 상에 개별 디바이스를 지정할 수 있는 항목을 추가하여 디바이스 간의 동작을 명세할 수 있도록 하였다.

• Journal of KIISE
• /
• v.43 no.4
• /
• pp.460-469
• /
• 2016

Internet of Things (IoT) is an environment where various devices are connected to each other via a wired/wireless network and where the devices gather, process, exchange, and share information. Some of the most important types of IoT devices are mobile IoT devices such as smartphones. These devices provide various high-performance services to users but cannot be supplied with power all the time; therefore, power management appropriate to a given IoT environment is necessary. Power management of mobile IoT devices involves complex relationships between various entities such as application processors (APs), HW modules inside/outside AP, Operating System (OS), platforms, and applications; a method is therefore needed to systematically analyze and manage these relationships. In addition, variabilities related to power management such as various policies, operational environments, and algorithms need to be analyzed and applied to power management development. In this paper, engineering principles and a method based on them are presented in order to address these challenges and support systematic development of IoT device power management. Power management of connected helmet systems was used to validate the feasibility of the proposed method.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2015.10a
• /
• pp.406-408
• /
• 2015

최근 사물인터넷 환경은 다양한 서비스 개발로 인해 동일 지역 내에 다양한 서비스 디바이스로 구성된 네트워크가 형성되어 있다. 이런 네트워크 환경은 효율적 서비스 제공을 위해 스스로 서비스를 인지하고 서비스 별 네트워크 구성 기법이 필요하다. 따라서 본 논문에서는 Infra-less IoT 환경에서의 Self-Organization Network (SON) 기반 서비스 지향형 IoT 네트워크 구성 방법을 제안한다. 제안하는 기법은 서비스 제공 시 필요한 네트워크 시그널링을 최소활 할 수 있는 기법으로 활용될 수 있다.

• Telecommunications review
• /
• v.24 no.5
• /
• pp.677-691
• /
• 2014

Connectivity is becoming more important keywords recently. For example, many devices are going to be connected to the internet. It is usually called as the IoT(internet of things). Many IoT devices can be evolved as a part of giant system of the world wide web. It is a great opportunity for us, because many new services can have emerged through this paradigm. In this paper, we propose a device virtualization framework for smart home service. The proposed framework connects the many home appliances devices and the internet using a dynamic protocol conversion. After our protocol conversion for device virtualization, our framework provides a RESTful API to access the resources of device through the internet. Therefore, the proposed framework can provide a variety of services, so it also can be developed into the ecosystem for smart home service. The current framework version only supports UPnP enabled devices of the home, but it can easily be extended to many other home middleware solutions. To verify the feasibility of the framework, we have implemented several service scenarios.

• Journal of Satellite, Information and Communications
• /
• v.9 no.3
• /
• pp.5-8
• /
• 2014

Recently, smart devices can be used with a variety of programs. Because of these characteristics, suitable lectures are provided to mobile device in Korea educational facilities. However, it is possible to reduce the learning efficiency from taking courses. because of many smart devices are using in a small display. Therefore, we need effectively in a small display content layout for overcome these problems. In this paper, we proposed content layer format for smart devices by Illustrated Programs based on Golden Ratio.

• Proceedings of the Korean Information Science Society Conference
• /
• 2011.06b
• /
• pp.446-449
• /
• 2011

최근 이동통신, 초고속 인터넷 등 유무선 통신 네트워크 기술 발전에 따라서 정보가정기기 기반의 홈네트워크 서비스는 비약적인 발전을 하고 있다. 특히, 이기종기기간 QOS(Quality of Service)를 보장해줄 수 있는 UPnP(Universal Plug and Play) 기반 기술은 다양한 홈네트워크 서비스 개발에 적용되어지고 있다. 홈네트워크 환경 구축 시 이기종기기간 데이터 교환 및 서비스 전환을 위해서는 홈네트워크 상에 구성되어져 있는 모든 디바이스들을 등록, 연결, 삭제 할 수 있는 관리 기능은 매우 중요한 요소이다. 이에 본 논문에서는 홈네트워크 환경에서 모바일에이전트를 사용하여 자동적으로 디바이스를 탐색하고 상호 연결 할 수 있으며 UPnP 기기가 설치된 공간에서 이동형 서비스를 연속적으로 제공할 수 있는 자동화된 디바이스 매칭 방법을 제안하였다. 모바일에이전트는 홈네트워크 환경에 구성되어져 있는 UPnP Device를 주기적으로 검색하고 탐색하는 기능을 가지고 있다. 또한 Device간의 신뢰성 있는 서비스를 위해 모바일에이전트는 사용자의 Device와 서비스 Device의 연관성을 분석한다. 그리고 가장 유사도가 높은 Device에게 서비스를 연결하는 서비스로그 정보 링크 동작을 수행한다. 그럼으로써 사용자는 서로 다른 서비스 환경에서도 자신의 서비스를 시간, 공간의 제약 없이 연속적으로 제공받을 수 있다.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.17 no.5
• /
• pp.43-49
• /
• 2017

In this paper, we propose the scheduling scheme of IEEE802.15.4e TSCH which is not specified in standard specification. The proposed scheme schedules the link by cooperating among the devices. A new device scans EBs(Enhanced Beacons) from network. An advertiser device broadcasts an enhanced beacon frame including links information on allocated channel offset and time-slots, and a new device can determine its own channel offset and time-slot. It's performance on maximum throughput and minimum delay is evaluated by comparing the proposed approach with a typical single channel IEEE802.15.4.

• Journal of Korea Multimedia Society
• /
• v.11 no.8
• /
• pp.1179-1193
• /
• 2008

Recently, mobile devices enabled with Web services are being considered as equal participants of the Web services environment. The frequent mobility of devices and the intermittent disconnection of wireless network require migrating or replicating Web services onto adjacent devices appropriately. This paper proposes an efficient method for migrating and replicating Web services among mobile devices through code splitting. Specifically, the proposed method split the source code of a Web service into sub-codes based on users' preference to its constituent operations. The sub-code with higher preference is migrated earlier than others. The proposed method also replicates a Web service to other devices to enhance its performance by considering context information such as network traffic or the parameter size of its operations.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2016.05a
• /
• pp.515-517
• /
• 2016

In this paper, we develope a stretchable wearable device containing services for processing physiological signals to extract emotion information. The emotion extracting algorithm conducts to recognize emotion from EDR, SKT, and HRV signals measured with the fabric sensors. In addition, the suggested wearable device can also solve the problems faced with today's many other wearable devices: 1) limited battery life 2) the lack of compatibility and expandability due to run on internal components designed for smart phone 3) the design has always been a crucial factor in determining the success of main stream consumer wearable devices.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.39C no.9
• /
• pp.789-800
• /
• 2014

In this paper, we propose a cooperative protocol of relay-based WUSB/DRD and WLP device in WSS of ship area WiMedia environment. For this purpose, we investigate a RNT table configuration and algorithm of RNS relay node used in relay-based cooperative communication. Then, we describe a device that makes up WLP network and propose a cooperative protocol for WUSB/DRD/WLP device communication. The proposed cooperative protocol can communicate with WUSB/DRD/WLP devices by using standard DRP reservation and WUSB DRP reservation.