• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1999.05a
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• pp.138-141
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• 1999

정보 통신 기술의 발달이 가속화되면서 주문형 비디오, 홈쇼핑, 원격 강의와 같은 멀티미디어 서비스의 제공이 현실화되고 있다. 이러한 멀티미디어 서비스를 댁내(in-home)까지 제공하기 위해서는 쉬운 망 관리, 고품질의 서비스 제공, 보안, 설치 및 사용의 용이성, 다양한 토폴로지 제공 둥과 같은 여러가지 요구사항들을 정립해야 한다. 본 논문에서는 댁내 통신 표준과 기술 개발 동향을 간단히 살펴보고, 댁내 통신망 구현에 관련된 여러 가지 요구 사항들을 체계적으로 정립하였다. 그리고, 최근 두각을 나타내고 있는 IEEE 1394 고성능 직렬버스 표준을 댁내 통신망 구현 기술로서 활용하고자 하는 경우 이러한 요구 사항을 얼마나 충족시켜줄 수 있는가를 분석하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.05a
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• pp.288-289
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• 2013

An integrated security mechanism is one of the key challenges in the open wireless network architecture because of the diversity of the wireless network in open wireless network and the unique security mechanism used in each one of these networks. Optimized security protocols and mechanisms are employed for the high performance and security. Finally, a challenge in the near future will converge the integration of Open Ubiquitous Sensor Network (OUSN) with security protocols for applying the their applications. We analysed unique network-centric features and security mechanism of various heterogeneous wireless networks.

• Journal of the Korean Society for information Management
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• v.14 no.2
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• pp.85-103
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• 1997

With the advanced information technology, the creation, capture, storage, management and use process of information is quickly changing from paper publishing to universal information access via high performance communications networking mechanism. The purpose of this paper is mainly to review and analyze electronic information management systems of advanced countries, and to build an applied model for effective electronic information management in Korea based upon various system's functional analysis.

• Journal of KIISE:Information Networking
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• v.37 no.6
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• pp.415-419
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• 2010

Bandwidth is an extremely valuable and scarce resource in a wireless network. Therefore, efficient bandwidth management is necessary in order to provide high quality service to users with different requirements. In this paper, we propose a bandwidth reservation algorithm based on Nash Bargaining Solution. The proposed algorithm has low complexity and are quite flexible in the different situations of network. Simulation results indicate that the proposed scheme has excellent performance than other existing schemes.

• Journal of Korea Multimedia Society
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• v.19 no.8
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• pp.1505-1515
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• 2016

The age of autonomous vehicles has come according to development of high performance sensing and artificial intelligence technologies. And importance of the vehicle's surrounding environment sensing and observation is increasing accordingly because of its stability and control efficiency. In this paper we propose an integrated platform for efficient networking, analysis and monitoring of multiple sensing data on the vehicle that are equiped with various automotive sensors such as GPS, weather radar, automotive radar, temperature and humidity sensors. From simulation results, we could see that the proposed platform could perform realtime analysis and monitoring of various sensing data that were observed from the vehicle sensors. And we expect that our system can support drivers or autonomous vehicles to recognize optimally various sudden or danger driving environments on the road.

• Journal of KIISE:Information Networking
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• v.35 no.5
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• pp.425-436
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• 2008

In this paper, we propose a resource effective call admission control(CAC) in integrated WLAN and cellular network. The proposed CAC mitigates the congestion of cellular network by handing over non-realtime traffic to WLAN. We analyze the proposed CAC in numerical and simulation method. The simulation results show that the proposed CAC achieves better performance than normal CAC. Especially, the proposed CAC can sustain desired QoS more robustly against high incoming non-realtime traffic load than againt realtime traffic load.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.7 no.8
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• pp.1805-1824
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• 2013

Recently, the use of wireless body area networks (WBAN) has been increasing rapidly in medical healthcare applications. WBANs consist of smart nodes that can be used to sense and transmit vital data such as heart rate, temperature and ECG from a human body to a medical centre. WBANs depend on limited resources such as energy and bandwidth. In order to utilise these resources efficiently, a very well organized medium access control (MAC) protocol must be considered. In this paper, a new, adaptive and energy-efficient MAC protocol, entitled isMAC, is proposed for WBANs. The proposed MAC is based on multi-channel communication and aims to prolong the network lifetime by effectively employing (i) a collision prevention mechanism, (ii) a coordinator node (WCN) selection algorithm and (iii) a transmission power adjustment approach. The isMAC protocol has been developed and modelled, by using OPNET Modeler simulation software. It is based on a networking scenario that requires especially high data rates such as ECG, for performance evaluation purposes. Packet delay, network throughput and energy consumption have been chosen as performance metrics. The comparison between the simulation results of isMAC and classical IEEE 802.15.4 (ZigBee) protocol shows that isMAC significantly outperforms IEEE 802.15.4 in terms of packet delay, throughput and energy consumption.

• Journal of Korea Society of Digital Industry and Information Management
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• v.17 no.3
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• pp.85-103
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• 2021

Entrepreneurship is recognized as an essential education in start-up education. However, domestic studies on entrepreneurship in developing countries are extremely rare. The purpose of this study is to compare the importance of entrepreneurship and the perception of implementation of Korean and Nepalese farmers, and to seek a start-up education strategy based on the results. As a result of the study, first, there was no difference in the importance of entrepreneurship in the 6th industry between two countries, but the degree of entrepreneurial spirit performance was high in Nepalese farmers. Second, in terms of the difference between the importance and execution of the 6th industry entrepreneurship, Korea had lower performance than importance in all factors, and Nepal had higher importance than implementation in innovation, initiative, cooperation, and networking capability. Third, in the difference between the importance and the degree of implementation in each country, the level of implementation was uniformly lower than that of importance in Korea, but the height of the Nepalese farmers was not uniform. The results of this study, which studied entrepreneurship in Korea and Nepal, contribute greatly in terms of promoting the national economy by creating new added values.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.13 no.3
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• pp.1213-1237
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• 2019

Vehicular Ad-hoc Network (VANET) facilities envision future Intelligent Transporting Systems (ITSs) by providing inter-vehicle communication for metrics such as road surveillance, traffic information, and road condition. In recent years, vehicle manufacturers, researchers and academicians have devoted significant attention to vehicular communication technology because of its highly dynamic connectivity and self-organized, decentralized networking characteristics. However, due to VANET's high mobility, dynamic network topology and low communication coverage, dissemination of large data packets (e.g. multimedia content) is challenging. Clustering enhances network performance by maintaining communication link stability, sharing network resources and efficiently using bandwidth among nodes. This paper proposes a mobility-based, multi-hop clustering algorithm, (MBCA) for multimedia content broadcasting over an IEEE 802.11p-LTE-enabled hybrid VANET architecture. The OMNeT++ network simulator and a SUMO traffic generator are used to simulate a network scenario. The simulation results indicate that the proposed clustering algorithm over a hybrid VANET architecture improves the overall network stability and performance, resulting in an overall 20% increased cluster head duration, 20% increased cluster member duration, lower cluster overhead, 15% improved data packet delivery ratio and lower network delay from the referenced schemes [46], [47] and [50] during multimedia content dissemination over VANET.

• Journal of KIISE:Information Networking
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• v.32 no.1
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• pp.110-122
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• 2005

Bluetooth has been reputed as a wireless networking technology supplying ad-hoc networks between digital devices. In particular, bluetooth scatternet is a most essential part for dynamic ad-hoc networks. But past researches on bluetooth scatternet has hardly treated dynamic scatternet environment. In this paper, we proposed a scatternet reformation algorithm for the case that some nodes escape from the scatternet. The proposed algorithm is a general algorithm which can be applied to many types of bluetooth scatternet regardless of the topology. The proposed algorithm has short reformation time delay because the process has only page process (not including inquiry process ). The algorithm is operated based on Recovery Node Vector which is composed of Recovery Master and Recovery Slave. In this paper, we performed the real hardware experiments for evaluating the performance of the proposed algorithm. In that experiments, we measured the reformation time and reformation probability. In comparison with the case including inquiry process, the proposed algorithm had the improvement in reformation time delay and we obtained high success rate over 97%.