• 전자공학회논문지B
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• 제28B권5호
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• pp.404-410
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• 1991

In this paper,a network interface unit of token-passing bus network and its driving software are implemented based on Mini-MAP. This network interface unit performs the function of MAC layer which is responsible for transmission and reception of frames as well as the management of logical ring. The driving software performs the management of data buffer and the report of errors, if ocoured, to the higher layer. Motorola MC68824 of is used as a TBC(Token Bus Controller) and Intel80186 as a CPU for network interface unit. The operation of network interface unit is verified by self-test which checks the functioning of TBC and CPU. In addition each module of driving software is tested to check the functions regarding transmission and reception of frames.

• 정보교육학회논문지
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• 제3권2호
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• pp.94-102
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• 2000

독서 교육은 교과뿐 아니라 인성 교육에까지 영향을 주기 때문에 교육 현장에서 중요하게 인정되어 수행되고 있다. 그러나 현실적인 많은 어려움으로 인해 독서 교육을 수행하는데 많은 제약이 있다. 현재까지 수행되어 오던 전통적인 교육 방법은 컴퓨터와 정보 통신 기술의 발달로 인해서 그 방법의 전환이 필요하게 되었으며, 이는 독서 교육 영역에서도 적용된다. 독서교육에서 논리적 사고와 토의력을 지속적으로 증진시키기 위해서는 시 공간적 제약 없이 다른 학습자들과의 상호작용 기회가 많이 제공되어 서로간의 생각이 교환되어져야 한다. 본 연구는 이러한 환경을 제공하기 위하여 독서 교육 시스템에 필요한 요소들을 살펴 보고 독서 지도에 따라 여러 가지 독서 활동을 할 수 있는 웹에 기반한 독서 교육 시스템을 설계 및 구현하였다.

• 융합보안논문지
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• 제13권4호
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• pp.109-115
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• 2013

인터넷망을 이용한 정보 전달의 대표적인 수단인 이메일 서비스 등을 통한 보안위협이 급증하고 있다. 이러한 보안위협의 공격 경로는 첨부된 문서파일에 악성코드를 삽입하고, 해당 응용프로그램의 취약점을 이용하여 사용자의 시스템을 감염시키게 된다. 따라서 본 연구에서는 파일 전송과정에서 위장악성코드의 감염을 차단하기 위해, 논리적 망 분리인 FTS(File Transfer System)를 이용한 무결성 검증 및 행위기반 탐지 시스템을 제안하고, 기존의 보안기법과의 비교 및 검증하고자 한다.

• 융합신호처리학회논문지
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• 제3권1호
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• pp.21-26
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• 2002

비디오 스트림들은 사용된 압축 알고리듬의 구조와 화면의 복잡도 등에 따라 다양한 형태의 트래픽이 발생함으로, 송신측과 수신측 사이의 자원할당을 어렵게 할 뿐만 아니라, 현재의 인터넷과 같은 패킷 통신망에서는 연속적인 재생을 어렵게 한다. 따라서, 본 논문에서는 멀티스트림을 이용한 비디오 스트림의 평활화 방법을 제안한다. 제안한 방법은 스트림의 형태에 따라 LDU(logical data unit)를 정의한 후 일정한 크기로 다수의 스트림으로 생성하여 전송함으로써, 평활화와 선반입 과정에서 발생하는 버퍼링 시간을 줄일 수 있을 뿐만 아니라 네트워크의 지터에도 강하면, 클라이언트의 대역폭을 최대한 활용할 수 있는 효율적인 전송 특성을 얻을 수 있다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2009년도 춘계학술대회
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• pp.281-286
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• 2009

The proposed technique uses cyclic frame structure, where three periods such as beacon period (BP), mesh contention access period (MCAP) and slotted period (SP) are in a data frame. This paper studies on a mechanism to allow communication nodes (6lowpan) in a PAN with different logical channel for global healthcare applications monitoring technology. The proposed super framework structure system has installed 6lowpan sensor nodes to communicate with each other. The basic idea is to time share logical channels to perform 6lowpan sensor node. The concept of 6lowpan sensor node and various biomedical sensors fixed on the patient BAN (Body Area Network) for monitoring health condition. In PAN (hospital area), has fixed gateways that received biomedical data from 6lowpan (patient). Each 6lowpan sensor node (patient) has IP-addresses that would be directly connected to the internet. With the help of IP-address service provider can recognize or analyze patient data from all over the globe by the internet service provider, with specific equipments i.e. cell phone, PDA, note book. The NS-2.33 result shows the performance of data transmission delay and data delivery ratio in the case of hop count in a PAN (Personal Area Networks).

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1989년도 한국자동제어학술회의논문집; Seoul, Korea; 27-28 Oct. 1989
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• pp.819-824
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• 1989

This paper proposes a new method for the discovery and design of an optimal heat exchanger network. The method is based upon the concept of pinch, a problem reduction technique and the heuristics developed in this work. It generates subproblems in a logical way and solves the subproblems by the heuristics to synthesize an optimal network structure. It is thought that the heuristics can preserve the minimum utility consumption, the minimum number of heat exchanger units, and the minimum number of stream splittings needed for a given problem. The minimum heat exchanger area for the optimal network can then be obtained by adjusting the temperatures associate with the heat exchanger in the optimal network structure. The method is applied to the problems appeared in the literatures. The results show the reductions in the number of heat exchanger units for some problems.

• International Journal of Computer Science & Network Security
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• 제24권4호
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• pp.141-146
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• 2024

A local area network (LAN) is a computer network within a small geographical area such as a home, school, computer laboratory, office building or group of buildings. A LAN is composed of interconnected workstations and personal computers which are each capable of accessing and sharing data and devices, such as printers, scanners and data storage devices, anywhere on the LAN. LANs are characterized by higher communication and data transfer rates and the lack of any need for leased communication lines. Communication between remote parties can be achieved through a process called Networking, involving the connection of computers, media and networking devices. When we talk about networks, we need to keep in mind three concepts, distributed processing, network criteria and network structure. The purpose of this Network is to design a Local Area Network (LAN) for a BAEC (Bangladesh Atomic Energy Commission) Head Quarter and implement security measures to protect network resources and system services. To do so, we will deal with the physical and logical design of a LAN. The goal of this Network is to examine of the Local Area Network set up for a BAEC HQ and build a secure LAN system.

• International Journal of Computer Science & Network Security
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• 제24권2호
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• pp.67-78
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• 2024

Software-Defined Networking (SDN) is a new emerging networking paradigm that has adopted a logically centralized architecture to increase overall network performance agility and programmability. Combining network virtualization with SDN will guarantees for combined advantages of improved flexibility and network performance. Combining SDN with hypervisors divides the network physical resources into several logical transparent and isolated virtual SDN network (vSDN), where each has its virtual controller. However, SDN hypervisors bring several advantages as well as several challenges to its network operators as for the virtual appliances, their efficient placement, assurance of network performance is mandatory, and their dynamic instantiation with their migration. In this article, we provide a brief and concise review of network virtualization along with its implementation in the SDN network. SDN hypervisors types are discussed, and taxonomy is provided to demonstrate the importance of hypervisors in SDN. A comparison of SDN hypervisors is performed to elaborate on the vital hypervisor software along with their features, and different challenges are discussed faced by the SDN network. A framework is proposed to add combined functionalities of hypervisors to create a more effective and efficient virtual system. The purpose of the framework is to increase network performance through proper configuration of resources, software, control plane isolation functions with defined rules and policies.

• International Journal of Contents
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• 제7권4호
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• pp.56-63
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• 2011

Quantum mechanics is a branch of physics for a mathematical description of the particle wave, and it is applied to information technology such as quantum computer, quantum information, quantum network and quantum cryptography, etc. In 1936, Garrett Birkhoff and John von Neumann introduced the logic of quantum mechanics (quantum logic) in order to investigate projections on a Hilbert space. As another type of quantum logic, orthomodular implication algebra was introduced by Chajda et al. This algebra has the logical implication as a binary operation. In pure mathematics, there are many algebras such as Hilbert algebras, implicative models, implication algebras and dual BCK-algebras (DBCK-algebras), which have the logical implication as a binary operation. In this paper, we introduce the definitions and some properties of those algebras and clarify the relations between those algebras. Also, we define the implicative poset which is a generalization of orthomodular implication algebras and DBCK-algebras, and research properties of this algebraic structure.

• 산업기술연구
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• 제17권
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• pp.43-50
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• 1997

Local administration is closely related with intention of residents. Especially, a plan item is closely related with life of residents. Therefore, it has to be logical and objective solution for opinion convergence. Decision of opinion has to be in a triangular position standard and stand in a trio of criteria in standard. But, opinion convergence of residents very difficult. Recently, the technique of GIS presents method for oponion convergence with logical and objective and scientifically solution. And, this study present method for decision of intention to a complex element with GRID and NETWORK techniques of GIS. This study present optimun site of constructure with the GIS technique in consideration of a side face of transportation, technical, social economy and environments.