• 한국산학기술학회논문지
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• 제10권1호
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• pp.140-145
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• 2009

최근 컴퓨터 네트워킹 기술을 텔레미터/텔레컨트럴 시스템에 적용하여 고성능의 스마트 제어기능을 제공하려는 연구가 활발하게 진행되고 있다. 본 논문은 온실 모델에 다양한 적용을 위하여 특별히 설계된 리모트 및 로칼 제어 소프트웨어를 갖는 클라이언트/서버 구조를 제안한다. 서버 장치는 센서나 액튜에이터에 관련되는 각종 데이터를 수집, 집적하고 고품질의 원격 I/O 제어동작을 유지하기 위하여 데이터베이스에 저장한다 이에 대해 클라이언트 장치는 인터넷 웹브라우저 상에서 제어 판넬과 같이 간단히 동작한다. 구현된 장치는 멀티미디어 정보가 포함된 온실의 감시 및 제어상태 모두를 대 화형으로 원활하게 통신하였다. 본 연구에서는 패킷 크기에 의해 영향 받는 종합적인 스루풋과 전송시간에 관계되는 성능 증대의 한계도 분석하였다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -3
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• pp.1567-1570
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• 2002

This paper deals with FPGA(Field Programmable Gate Array) implementation of the AAC(Advanced Audio Coding) decoder. On modern computer culture, according to the high quality data is required in multimedia systems area such as CD, DAT(Digital Audio Tape) and modem. So, the technology of data compression far data transmission is necessity now. MPEG(Moving Picture Experts Group) would be a standard of those technology. MPEG-2 AAC is the availableness and ITU-R advanced coding scheme far high quality audio coding. This MPEG-2 AAC audio standard allows ITU-R 'indistinguishable' quality according to at data rates of 320 Kbit/sec for five full-bandwidth channel audio signals. The compression ratio is around a factor of 1.4 better compared to MPEG Layer-III, it gets the same quality at 70％ of the titrate. In this paper, for a real time processing MPEG2 AAC decoding, it is implemented on FPGA chip. The architecture designed is composed of general DSP(Digital Signal Processor). And the Processor designed is coded using VHDL language. The verification is operated with the simulator of C language programmed and ECAD tool.

• 한국ITS학회 논문지
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• 제19권5호
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• pp.151-161
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• 2020

본 논문에서는 ITS 분야의 한국의 표준화 역량을 점검하였으며, 아시안 국가들의 ITS 표준화 참여 및 서비스 현황과 한국과의 협력 희망정도를 조사 분석하였다. 그 결과 한국은 ITS 표준화 분야에서 국제적인 역량을 인정받고 있으며, 싱가포르를 제외한 아세안 대부분의 국가들은 ITS 표준화 참여도와 서비스 도입이 미진한 것으로 파악되었다. 또한 아세안 대부분의 나라들이 한국과 ITS 표준화 협력을 희망하고 있으며, 우선적으로 ITS 표준화의 기반인 ITS 시스템 아키텍처 구축을 선호하는 것으로 파악되었다. 또한 표준화 도입 서비스분야로는 아세안 국가 간 물류운송 효율성 제고 등을 고려하여 화물 운송 분야가 우선 적용 서비스 분야로 제시되었다.

• 대한전자공학회논문지TC
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• 제42권12호
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• pp.71-76
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• 2005

E.164와 IP주소가 지원되는 070-VOIP 서비스가 시작되었다. 유${\cdot}$무선통합의 멀티미디어컨버젼스 서비스에서 EPC와 IP 주소를 E.164 주소로 융합하는 주소체계를 제안하였다. 향후 BcN네트워크에서 엔드유저는 E.164를 기반으로 하는 통합된 주소체계를 이용할 수 있는 방안을 제시하였다. 유비쿼터스 주소체계는 IP기반의 E.164 주소체계를 이용하여 통합된 하나의 주소체계를 적용함으로서 모든 사물에 지능화시에 확장성이 용이할 것이다.

• 한국주거학회논문집
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• 제24권3호
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• pp.1-8
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• 2013

The University students learn their major or a general education in lecture rooms. In these days, lecturer use frequently various multimedia in lecture room. Appropriate control lighting environment in lecture room should be essential and related in efficient studying. Daylighting on front-side of lecture room will cause glare and students are hard to read contents on white-board at their seat. Therefore, in order to preventing glare we simulated daylighting of lecture room with using computer software in this study. Results from simulation and analysis as follows: The first, if students' left-side is east-oriented in lecture room, best daylighting condition about glare in lecture room. The second, architectural designers can use simulation data of daylighting or simulate data in designing university buildings with lecture rooms. Finally, if reducing size of windows (narrow and deep daylight: more closing vertically, from up to down daylighting: more closing horizontally) we will be able to reduce energy from lecture room.

• 한국정보처리학회논문지
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• 제6권3호
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• pp.622-632
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• 1999

As the complexity of software development is increasing due to networking, multimedia, and diverse system architecture, the need for effective software development methodology is increasing. Especially, due to software standard and internalization of software market, it is necessary to accept international quality such as ISO 9000-3. In addition, object oriented development methodology is required due to rapid propagation of OO technology and standardization. Recently, UML was accepted by the OMG as standard object-oriented modeling language for distributed environment. When we UML was accepted by the OMG as standard object-oriented modeling language for distributed environment. When we develop Java and CORBA-based software, often UML is applied to Java and CORBA-based projects. However, current structural or OMT-based object-oriented methodologies. In this paper, we proposed UML-based development and concrete guidelines for each phase in order to apply UML to software development practically and effectively. Also, we define the transition guidelines and semantics between various development tasks. In addition, the analysis and design techniques of user interface and system development techniques needed in Web application development are presented.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2006년도 춘계종합학술대회
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• pp.986-989
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• 2006

앞으로의 네트워크는 Convergence와 Integrate라는 키워드를 기반으로 IP 중심의 통합된 망으로 발전되고 있다. IP 중심의 망은 각각의 다양한 access 기술을 포함하며, voice, multimedia, 그리고 새롭게 정의되는 서비스가 모두 제공될 수 있어야 한다. 따라서 점차 인터넷을 중심으로 하는 하나의 통합된 망의 형태로 진화 될 것이다 이러한 차세대 네트워크상의 단말은 소형화, 지능화, 그리고 이동성을 지니고 있으며, 다양한 access 기술을 사용하기 위한 multiple 인터페이스를 가진 멀티호밍 환경에 놓여있다. 따라서 이 네트워크는 기본적으로 이동성과 멀티호밍을 지원해야 하는 것이다. 그러나 현재 인터넷의 핵심인 Internet Protocol 구조는 이를 지원하지 못한다. 현재 IP 주소는 최종 단말의 식별자 (Identifier)와 단말의 위치 식별자 (locator)의 의미를 함께 사용하고 있어, 통신 중인 단말이 이동하면 IP 주소도 변경되어 통신 중인 세션이 끊기는 문제가 발생한다. 멀티호밍 환경에서도 역시 통신 중인 노드들의 경로를 바꾸게 되면 세션이 끊기게 되는 문제가 발생한다. 본 논문은 이와 같은 린 구조의 근본적인 문제를 해결하기 위해 Identifier와 locator를 분리하며, 단순하게 단말에 스택으로 존재하는 L3SHIM을 소개하고, 모든 단말에 이 기능이 지원되었을 때 기존의 인터넷 프로토콜의 확장과 인터넷의 구조에 어떤 영향을 줄 수 있는지에 대해 선행 연구를 하였다.

• Journal of Communications and Networks
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• 제4권3호
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• pp.161-169
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• 2002

Ad hoc wireless networks involving large populations of scattered communication nodes will play a key role in the development of low power, high capacity, interactive, multimedia communication networks. Such networks must support arbitrary network connections and provide coverage anywhere and anytime. This paper partitions such arbitrarily connected network architectures into three distinct groups, identifies the associated dual network architectures and counts the number of network architectures assuming there exist N network nodes. Connectivity between network nodes is characterized as a random event. Defining the link availability P as the probability that two arbitrary network nodes in an ad hoc network are directly connected, the network connection probability $ \integral_n$(p) that any two network nodes will be directly or indirectly connected is derived. The network connection probability $ \integral_n$(p) is evaluated and graphically demonstrated as a function of p and N. It is shown that ad hoc wireless networks containing a large number of network nodes possesses the same network connectivity performance as does a fixed network, i.e., for p>0, $lim_{N\to\infty} Integral_n(p)$ = 1. Furthermore, by cooperating with fixed networks, the ad hoc network connection probability is used to derive the global network connection probability for hybrid networks. These probabilities serve to characterize network connectivity performance for users of wireless ad hoc and hybrid networks, e.g., IEEE 802.11, IEEE 802.15, IEEE 1394-95, ETSI BRAN HIPERLAN, Bluetooth, wireless ATM and the world wide web (WWW).

• 대한임베디드공학회논문지
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• 제6권3호
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• pp.190-200
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• 2011

Android platform provides a content provider and a cursor mechanism to access the internal SQLite engine. Content providers not only store and retrieve data but also make it accessible to applications. Applications can only share data through content provider, since there's no common storage area that Android packages can access. Cursor is an interface that provides random read-write access to the result set returned by a database query. However, this cursor possesses two major limitations. First, a cursor does not support a join clause among cursors, since the cursor can only access a single table in the content provider. Second, the cursor is not capable of creating user-customized field in the predefined content providers. In this paper, we propose the unified cursor architecture that merges several cursors into a single virtual cursor. Cursor translation look-aside buffer (TLB), column windowing mechanism and virtual data management are the three major techniques we have adopted to implement our structure. And we also propose a delayed synchronization method between an application and a proposed unified cursor. An application can create a user-customized field and sort multiple tables using a unified cursor on Android platform.

• 대한건축학회논문집:계획계
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• 제34권2호
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• pp.59-66
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• 2018

The purpose of this study is to investigate the method on improving the frequency of use and satisfaction rate of the community facilities and to evaluate relation between improving the frequency of use and satisfaction rate of the community facilities and improving the sense of community in apartments. The research subjects of this study is the four public lease apartments which is built around same period with same design guide. The survey method is a questionnaire survey, a experimental study, focus group interview, an analysing drawing. The result of study is as follows. The first, the frequency of use and satisfaction rate have been effected by the operation management system as well as the physical circumstance. The second, The frequency of use and satisfaction rate of the community facilities have had positive correlation with sense of community. The third, multimedia room and conference room with low usability need to change a multipurpose space such as cafe, classroom for learning on artistic topic with high demand from occupant. Finally, a mindset shift is required for architects to inspire community facilities as an important mediated space improving the sense of community by suggesting spaces for leisure and hobby activities.