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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.
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.
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.
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.
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.
객체 지향모델인 Actor에서 최대 병렬성 지원의 순차 합성법
곽호영,김장형,안기중 제주대학교 1991 논문집 Vol.33 No.-
Actor 모델은 병렬 처리 구조를 기반으로 하는 병행 합성 방법을 사용하고 있기 때문에 특별히 문장의 처리 순서가 유지되어야 하는 순차 합성의 경우에는 고객 actor를 생성하여 이용하는 방법으로 처리하고 있다. 그러나, 이 고객 actor로 하여금 다음 문장의 처리를 전가시키는 방법에서 발생되는 병렬성 감소로 인하여 Actor 모델 자체의 미세화 병행성 개념에 위배된다. 따라서, 본 논문에서는 이를 개선하기 위한 방법으로서 순차 합성의 경우에 각 프로세스들 간에 의존성을 평가하여 동일한 시스템을 유지하면서 병렬성을 극대화하는 MPS 알고리즘을 세 가지로 제시하였다. 제안된 알고리즘을 이용한 MPS는 앞장에서 살펴본 바와 같이 그 병렬성은 기존의 Actor 모델에서와 같이 고객 actor를 이용하는 처리 방식보다 증가되었으며, 또한 [정리 1,2]를 이용한 알고리즘보다는 전달 기능의 고객 actor를 제거하는 방법이 궁극적으로 프로세스의 수를 줄일 수 있기 때문에 매우 효율적인 방법으로 평가되었다. 이 알고리즘은 Actor 모델의 구현을 위한 커널의 설계에 있어서 병렬 처리 구조가 갖는 병행 처리의 정도를 최대로 부여하기 위해 제안하였다. In Actor model based on message-passing mechanism and parallel architecture, all commands in an Actor are processed concurrently. However, when sequential processing of commands must be preserved, it can be solved by creating actors called customers which are to do delegation, because concurrent compositions inherent in Actor, are not enough to do the sequential processing of commands. In this paper, the dependency between expressions in the sequential composition of actor commands is analyzed, and the sequential composition method for supporting minimal sequentiality and maximal parallelism in the Actor model is presented.