• Journal of KIISE:Software and Applications
• /
• v.41 no.8
• /
• pp.545-556
• /
• 2014

Internet of Things (IoT), one of the emerging research areas, is the computing paradigm where various things connect to the network and cooperate with their neighbors to reach common goals. Computing with IoT devices opens up a new array of opportunities for providing value-added smart services and applications to end users. That is, IoT devices play an important role of providing useful services to the users. However, the states of IoT devices are dynamically changed at runtime, which come from their mobility, network connectivity, and a battery drain problem. This dynamism results in difficulties in managing these IoT devices. In this paper, we propose a framework to manage those IoT devices with dynamism. Hence, we first derive issues from IoT devices' dynamism. And, we define a set of requirements to manage the IoT devices and present a framework to manage the device dynamism. The framework is equipped by a device discovery method, a device status monitoring method, a device selection and connection method, and a device replacement method. Finally, we verify the feasibility and effectiveness of the framework through experiments.

• Journal of Internet Computing and Services
• /
• v.15 no.6
• /
• pp.85-97
• /
• 2014

IoT devices that collect information for end users and provide various services like giving traffic or weather information to them that are located everywhere aim to raise quality of life. Currently, the number of devices has dramatically increased so that there are many companies and laboratories for developing various IoT devices in the world. However, research about IoT computing such as connecting IoT devices or management is at an early stage. A server node that manages lots of IoT device in IoT computing environment is certainly needed. But, it is difficult to manage lots of devices efficiently. However, anyone cannot surly know about how many servers are needed or where they are located in the environment. In this paper, we suggest a method that is a way to dynamic clustering IoT computing environment by logical distance among devices. With our proposed method, we can ensure to manage the quality in large-scale IoT environment efficiently.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2019.05a
• /
• pp.188-189
• /
• 2019

최근 출시되는 다양한 IoT 서비스 환경에 참여하고 있는 객체들은 각자 인터넷에 연결되어 다른 객체와 통신할 수 있다. 이전에는 디바이스가 직접 인터넷에 연결될 수 있는 능력이 없었기 때문에 게이트웨이와 같은 중간 연결 매개체를 통해 인터넷에 연결되었다. 이후 IoT 디바이스의 성능이 좋아짐에 따라 디바이스가 직접 인터넷에 연결되고, 다른 디바이스들과 직접 통신할 수 있게 되었다. 디바이스는 사용자의 스마트폰이 될 수 있고, 스마트홈이나 스마트시티를 구성하는 여러 디바이스들이 될 수 있으며, 이를 확인하고 안전하게 데이터를 송수신하기 위해서는 인증 및 키 관리가 필수적이다. 객체가 인터넷에 연결될 수 있음에도 불구하고 IoT 디바이스들은 제한된 환경에서 동작하는 특성을 가지기 때문에, 기존 인증 및 키 합의 프로토콜을 그대로 적용할 수 없다. 따라서 본 논문에서는 IoT를 구성하는 객체가 인터넷에 직접 연결되고 서로 안전하게 통신하기 위해 ECQV(Elliptic Curve Qu-Vanstone) 묵시적 인증서를 통해 상호 인증 후 키를 안전하게 합의할 수 있는 인증 및 키 합의 기법에 대해 연구한다.

• Journal of Internet Computing and Services
• /
• v.16 no.5
• /
• pp.75-86
• /
• 2015

Internet of Thing (IoT) computing is an environment where various devices with sensors and actuators are connect, and interact together to acquire contexts and provide useful services. With the advances of IoT technologies, its usability becomes an in important issue. However, there exist various types of faults in IoT computing which are not conventionally addressed in software research community. Providing reliable IoT services is challenging. In this paper, we present a hierarchy of IoT faults and analyze causes and symptoms of the faults. Based on the analysis, we define effective methods for managing IoT faults. We believe that our proposed framework for managing IoT faults can be utilized in reducing the development cost of IoT applications and enhancing the quality of the applications.

• Journal of Convergence for Information Technology
• /
• v.10 no.7
• /
• pp.7-13
• /
• 2020

IoT which is the core IT of the 4^th industrial revolution, is providing various services from users in the conversion with other industries. The IoT convergence technology is leading the communication paradigm of communication environment in accordance with the increase of convenience for users. However, it is urgently needed to establish the security measures for the rapidly-developing IoT convergence technology. As IoT is closely related to digital ethics and personal information protection, other industries should establish the measures for coping with threatening elements in accordance with the introduction of IoT. In case when security incidents occur, there could be diverse problems such as information leakage, damage to image, monetary loss, and casualty. Thus, this paper suggests a certificate management technique for safe control over access in IoT-based Cloud convergence environment. This thesis designed the device/user registration, message communication protocol, and device renewal/management technique. On top of performing the analysis on safety in accordance with attack technique and vulnerability, in the results of conducting the evaluation of efficiency compared to the existing PKI-based certificate management technique, it showed about 32% decreased value.

• KIPS Transactions on Software and Data Engineering
• /
• v.4 no.4
• /
• pp.151-160
• /
• 2015

Internet-of-Things(IoT) is the computing environment to provide valuable services by interacting with multiple devices, where diverse devices are connected within the existing Internet infrastructure and acquire context information by sensing. As the concern of IoT has been increased recently, most of the industries develop many IoT devices. And, many people are focused on the IoT application that is utilizing different technologies, which are sensor network, communication technologies, and software engineering. Developing on-ground IoT application is especially even more active in progress depending on increasing of on-ground IoT devices because it is possible for them to access dangerous and inaccessible situation. However, There are a few studies related IoT. Moreover, since on-ground IoT application, which is different from typical software application, has to consider device's characteristics, communication, and surround condition, it reveal challenges, decreasing reliability. Therefore, in this paper, we analyze reliability challenges related to maturity and fault tolerance, one of reliability attributes, occurring in developing on-ground IoT applications and suggest the effective solutions to resolve the challenges. To verify proposed the challenges and solutions, we show result that is applying the solutions to applications. By presenting the case study, we evaluate the effectiveness of applying the solutions to the application.

• Journal of KIISE
• /
• v.42 no.11
• /
• pp.1441-1451
• /
• 2015

As one of the most spotlighted research areas, these days, the Internet of Things (IoT) aims to provide users with various services through many devices. Since there exist so many devices in IoT environments, it is inefficient to manually configure the domain name system (DNS) names of such devices. Thus, for IPv6-based IoT environments, this paper proposes a scheme called the DNS Name Autoconfiguration (DNSNA) that autoconfigures an IoT device's DNS name and manages it. In the procedure for generating and registering an IoT device's DNS name, the standard protocols of the Internet Engineering Task Force (IETF) are used. Since the proposed scheme resolves an IoT device's DNS name into an IPv6 address in unicast through a DNS server, it generates less traffic than multicast-based mDNS (Multicast DNS) which is a legacy DNS application for the DNS name service in the smart home. Thus, the proposed scheme is more appropriate in multi-hop IoT networks than mDNS. This paper explains the design of the proposed scheme and its service scenarios, such as smart home and smart road. It also explains the implementation and testing of the proposed scheme in the smart grid.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2022.10a
• /
• pp.597-599
• /
• 2022

When IoT device performs on-device AI, the device is required to use various AI models selectively according to target service and surrounding environment. Also, AI model can be updated by additional training such as federated learning or adapting the improved technique. Hence, for successful on-device AI, IoT device should acquire various AI models selectively or update previous AI model to new one. In this paper, we propose AI model repository to tackle this issue. The repository supports AI model registration, searching, management, and deployment along with dashboard for practical usage. We implemented it using Node.js and Vue.js to verify it works well.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2018.01a
• /
• pp.41-42
• /
• 2018

본 논문에서는 IoT 게이트웨이 기반 서비스 탐색 관련 상호운용성 지원을 공통 서비스 탐색 기법을 제안한다. 사물인터넷 분야에서는 다양한 서비스 탐색 기법이 제안되어 있다. 특히, 중앙 관리 방식과 분산 관리 방식으로 구분되어 제안되었다. 또한 네트워크 인터페이스 타입에 따라서 다른 프로토콜이 사용되고 있다. 이런 로컬 네트워크 내에 상이한 서비스 탐색 프로토콜의 사용을 서비스 탐색과 관련된 홍보기능이 제공되지 못하기 때문에 디바이스간 서비스 탐색이 이루어지지 못한다. 본 논문에서는 이런 문제점을 해결하기 위한 IoT 게이트웨이 내부에 서비스 디렉토리를 새롭게 정의하고 이를 이용하는 공통 서비스 탐색 방법을 제시한다.

• Journal of Convergence for Information Technology
• /
• v.10 no.11
• /
• pp.55-63
• /
• 2020

The IoT technology is a field that applies and converges the technologies in the existing industrial environment, instead of new technologies. The IoT technology is releasing various application services converged with other industries such as smart home, healthcare, construction, and automobile, and it is also possible to secure the work efficiency and convenience of users of IoT-based technologies. However, the security threats occurring in the IoT-based technology environment are succeeding to the vulnerability of the existing wireless network environment. And the occurrence of new and variant attacks in the combination with the ICT convergence environment, is causing damages. Thus, in the IoT technology-based environment, it would be necessary to have researches on the safe transmission of messages in the communication environment between user and device, and device and device. This thesis aims to design a safe communication protocol in the IoT-based technology environment. Regarding the suggested communication protocol, this thesis performed the safety analysis on the attack techniques occurring in the IoT technology-based environment. And through the performance evaluation of the existing PKI-based certificate issuance system and the suggested communication protocol, this thesis verified the high efficiency(about 23%) of communication procedure. Also, this thesis verified the reduced figure(about 65%) of the issued quantity of certificate compared to the existing issuance system and the certificate management technique.