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김정환(Kim Jung-Hwan),허요한(Heo Yo-Han),최정아(Choi Jung-Ah),김도현(Kim Do-Hyeun),변상용(Byun Sang-Yong),안기중(Ahn Khi-Jung) 한국콘텐츠학회 2005 한국콘텐츠학회 종합학술대회 논문집 Vol.3 No.2
최근 무선인터넷을 이용할 수 있는 환경이 많이 만들어지면서 PDA를 이용한 무선인터넷의 활용도가 점점 더 많아지고 있다. PDA를 이용한 무선인터넷의 인프라가 많이 구축되면서 사용자들은 점점 더 많은 서비스와 다양한 콘텐츠를 요구하게 되었고, 실제로 다양한 서비스가 PDA에서 이용되고 있다. 이러한 사회적 여건 변화에 따라 본 논문에서는 휴대가 간편하고 손쉽게 정보를 얻을 수 있는 무선 인터넷 기반의 PDA를 이용하여 작명서비스를 받을 수 있도록 작명에 필요한 법칙을 알고리즘화하고 서비스를 설계하고 구현한다. Recently, with the rise of wireless Internet, it is becoming popular to use PDA. Also, the more wireless Internet Infra increases, the more services and a variety of contents are needed. Actually, a number of services is being used for PDA. Accordingly, this paper designs and implements naming service based on wireless Internet which is portable and easy for information. We develope the algorithm, design and implement the service for naming service.
안전한 관광 서비스를 위한 블록 체인 플랫폼의 인터워킹 메커니즘
장림초 ( Linchao Zhang ),항뢰 ( Lei Hang ),안기중 ( Khi-jung Ahn ),김도현 ( Do-hyeun Kim ) 한국정보처리학회 2019 한국정보처리학회 학술대회논문집 Vol.26 No.2
Recently, data security and convenience are critical requirements to the interaction and collaboration of tourism service systems for the tourism industry. However, there are still many challenges for current tourism service systems to fulfill these requirements since they have inconsistent structures with different access control models and security policies. Blockchain has the potential to evolve the conventional tourism by its unique features such as data privacy and transparency. This paper mainly aims the interworking mechanism of heterogenous blockchain platforms for secure tourism service. We propose interworking scheme to connect multi-blockchain platforms for enhancing data integrity in the tourism industry. A proof of concept design and implement based on Hyperledger Fabric and Winding Tree.
FlexRAN 제어기를 이용한 무선 접근 망 슬라이싱을 위한 테스트베드
아흐메드자한젭 ( Jahanzeb Ahmed ),송왕철 ( Wang-cheol Song ),안기중 ( Ahn¸ Khi Jung ) 한국정보처리학회 2019 한국정보처리학회 학술대회논문집 Vol.26 No.2
Slicing Radio Access Network (RAN) can help in effectively utilizing the network bandwidth and to better manage the increasing traffic over interent. RAN slicing system discussed in this paper is based on an open-source slicing mechanism in which we write a JSON configuration file for slicing policy and send it to the FlexRAN controller. FlexRAN controlls the core networks (CNs) through OAI-RAN on the evolved packet core (EPC) component of this system. Each CN is responsible for handling a saperate RAN slice. The type of internet traffic is identified by the FlexRAN crontroller and is sent to the respective CN through OAI-RAN. CN handles the traffic according to the allocated bandwidth and in this way the internet traffic is sliced inside the EPC component.
안기중 濟州大學校 工科大學 産業技術硏究所 1998 尖端技術硏究所論文集 Vol.9 No.1
ATM Network supports various types of services, that have few intrinsic properties and it is difficult to know a priori. Therefore most traffic control mechanisms based on the fixed traffic parameters revealed some limitations to the network performance. In this paper, a dynamic parameter based traffic control scheme is proposed to enhance the network performance such as cell conformance ratio and cell loss probabilities in ATM networks. For every user connection source traffics can be superposed and cause some congestion in the network, especially in the multiplexing stages. This happens even if their total capacity is below the link capacity and its degree is getting worse with longer bursts which can be affected by CDV tolerance during cell conformance test. The proposed mechanism continuously monitors the buffer and based on its trend the CDV tolerance is adjusted and feedbacked to GCRA. This makes it possible to allocate more bandwith to each user connection and therefore achieve lower CLPs and higher cell conformance ratios.
ATM망에서 비율적 대역할당을 이용한 혼잡제어 알고리즘
신영미,안기중 濟州大學校工科大學産業技術硏究所 1999 尖端技術硏究所論文集 Vol.10 No.1
In this paper, ER-based traffic control algorithm is proposed to offer ABR service efficiently according to the request of ABR traffic service in ATM Networks. It is necessary to add function mediating a transmission rate of VC unit in order to efficiently apply VC link for users' QoS requirements. Accordingly, a proposed method means to calculate bandwidth with the FairShare value based on PCR of each ABR VC according to the available bandwidth of networks, and to regulate traffic. It is shown that the algorithm proposed with the simulation results is more excellent than an established ERICA algorithm in view of allotting suitable bandwidth to traffic feature, and link usage.
안기중 濟州大學校 産業技術硏究所 1997 산업기술연구소논문집 Vol.8 No.1
In this paper, a traffic enforcement algorithm is proposed to enhance the efficiency of traffic shaper in point of the cell conformance ratio with parameters negotiated during call connection setup in ATM network. This algorithm is based on Leaky Bucket but uses the limiting function of cell delay variations. which is controlled dynamically to absorb their propagation effects according to the input and output profiles. The simulation study shows its justifiability and its efficiency increasing for the traffic with higher burstiness. This allows more cells to be handled in the network and higher QOS can be provided to the users accordingly.