PC 환경에서 블루투스 프로토콜 분석장비 개발

정중수 安東大學校 工業技術硏究所 2001 공업기술연구논문집 Vol.8 No.1

오늘날 무선통신 기술은 기존 유선 통신방식에 추가하여 매우 주목받고 있는 정보통신 혁명을 주도하였다. 무선 통신에서 자체 피코넷을 형성하여 음성이나 데이터 통신을 수행하는 블루투스 기술은 이제 액세스망을 통해 공중망과 접속 가능하게 되었다. 본 논문에서는 블루투스 디바이스와 UART케이블로 접속된 PC에서 블루투스 프로토콜을 분석하는 블루투스 프로토콜 분석장비 개발을 소개하였다. 이의 개발 환경으로는 윈도우 98 OS와 MS 비주얼 C를 사용하였다. 비주얼 C로 작성된 응용 프로그램은 블루투스 디바이스에 실장된 펨웨어와 인터페이스를 수행하여 개발되었다. 또한 개발된 시스템을 실제 블루투스 시스템에 적용하여 시험한 결과 만족한 성능을 제시하였다. In addition to wire technology, wireless technology has had communication revolution nowadays. Bluetooth technology carries out data/voice communication within pico-net. Nowadays the various services are supported by access network connected to public network. This paper presents implementation of bluetooth protocol analyzer which is monitoring and simulating bluetooth protocol. MS window98 and visual C are used for development environment and application program is operated over firmware loaded bluetooth device connected to the PC through UART or USB. The performance analysis of monitoring and simulation results satisfies with bluetooth device interface.

現代建築에서 透明性 要素의 特性 및 適用計劃에 關한 硏究

김곤,윤성훈 安東大學校 工業技術硏究所 1999 공업기술연구논문집 Vol.6 No.1

모더니즘 이후 피막으로서 뿐만 아니라 공간의 확장 개념으로서 투명성을 가진 유리재료를 건축물에 사용되게 되었고, 이러한 재료들은 단순히 건축물을 형성하는 부수적인 역할을 뛰어넘어 건축물 자체의 조형철학을 표현하는 재료로서 자리 매김을 하게 된다. 본 연구에서는 현대 건축의 디자인 표현방법으로 나타난 투명성의 개념을 유리재를 중심으로 분석 대상 건물로 설정하고, 이를 통해 유리가 투명성의 표현 방법으로서 적용될 수 있었던 특성과 과학기술의 발달에 따라 현대건축에서 나타난 유리를 통한 투명성의 특성을 살펴봄으로써 건축에 있어서 투명성의 적용가능성과 그 의미를 도출해 보고자 하였다. 한국 현대 건축에 있어서도 기업의 이미지 제고와 기술력의 과시, 21세기 정보화 사회의 개방적인 이미지 표현의 한 개념으로 다양하고 새로운 투명성의 표현을 건축에 적용시키고 발전시켜 나가야 할 것이다. The development of science and technology came true a entirely new architecture with a new material and skills which made a foundation of contemporary architecture. The purpose of this study is to define the concept of transparency and analyze the characteristics and effects of transparency that is variously expressed in contemporary architecture. So, we can summarize and categorize the characteristics of architectural expression as follows: ① Expressional characteristics using the transmission and reflection of light : Transformation of building facade in a changing point of view /Transmission from exterior environment to interior space, transmission from interior space to exterior environment /Reflection of urban streetscape using the reflective glass /Dematerialization and non-scale /Expression of non-gravitation ② Expressional characteristics using the exposed structure and building control system ③ Expression of ideal images: Contrast/Disappearance/Visual connection/New high-technology image

미국의 과학 기술 교육 정책

김영주 安東大學校 工業技術硏究所 2000 공업기술연구논문집 Vol.7 No.1

본 논문은 미국의 과학 기술 교육 정책에 대한 연구이다. 미국 연방 정부 및 각 주 정부의 과학 기술 교육 정책 및 지침들이 고찰되었고 과학 기술 교육을 고양시키기 위한 방안들이 제시되었다. This is a study on the technology education in the United States. The technology education policies of the federal government and each state government are surveyed and discussed. Some suggestions for further enhancing the technology education are provided.

열하중을 중심으로 한 사용 후 핵연료 건식 중간저장 시설에 대한 구조해석 방법 및 기술기준에 대한 연구

김영상 安東大學校 工業技術硏究所 1996 공업기술연구논문집 Vol.3 No.1

The spent fuel storage facility should be designed and maintained throughout the planned storage period to ensure the major functions such as the radiation shielding, residual heat removal, confinement, etc. The objective of this research is to develop the structural analysis and design method, and the technical standard for the independendent spent fuel dry storage facility to ensure the structural safety and functional performance under several design load conditions. In particular, the thermal load is very important among the design loads due to the characteristics of the dry type storage facility. The technical standard, which is implying for the design of the structures in the independent spent fuel storage facility, is developed based on the functional performance and design principles. Overall considering items such as the radiation shielding, residual heat removal, maintenance etc. for the functional features are developed. And design requirements, procedures, design loads, load combinations, and design limits are developed to ensure the structural integrity of the structure and equipment under design load conditions. In particular, the major items, which should be considered in the analysis and design in the independent spent fuel storage facility for the thermal load, are developed based on the analysis method, analysis modelling, analysis results. The developed technical standard for the structures of the dry storage type of the independent spent fuel storage facility provide guidelines in developing the detail design criteria of this facility.

정전용량방식을 이용한 대용량 곡물의 실시간 함수율 측정장치의 구현

김청월 安東大學校 工業技術硏究所 1999 공업기술연구논문집 Vol.6 No.1

본 논문은 정전용량방식을 이용한 곡물의 실시간 함수율 측정장치의 구현에 관한 것이다. 곡물에 인가되는 기준신호로는 6V의 진폭을 가지는 10KHz의 정현파를 사용하였으며, 곡물의 정전용량에 따라 측정신호의 위상을 편이시키는 저항은 8㏀을 사용하였다. 구현된 장치에서는 위상차 신호의 크기와 곡물의 함수율 관계를 나타내는 함수율 기준곡선은 오븐법을 이용한 수분측정법을 사용하여 구하였다. 보리의 경우에 함수율 10%에서 30%까지 측정할 수 있도록 함수율 기준곡선을 구하고, 이를 이용하여 여러 수분 값을 가지는 보리를 100Kg 단위로 실시간으로 측정한 결과 1%이내의 오차를 나타내었다. This paper presents the implementation of the of the real-time moisture rate measurement apparatus for a large volume of grains using the electrostatic capacitance method. A sinusoidal signal with amplitude of 6V and frequency of 10KHz, to measure the electrostatic capacitance of gains, was used as a reference signal and a resistor of 8 ㏀ was used to shift the phase of the measurement signal according to the variation of the electrostatic capacitance of gains. In the implemented apparatus, the reference curve of the moisture rate measurement, which showed the relationship of the moisture rate of grains to the magnitude of the phase difference signal, was obtained the moisture measurement technique using the oven method. For the barley, the moisture rate reference curve was obtained to be measure moisture rate from 10 percents to 30 percents. the measuremenet error was Jess than 1 percent when the moisture rate of barley was measured in the unit of weight of 100 Kg and on real time.

가공 열처리에 의한 Alloy 600의 결정립계 특성 변화와 입계 부식 거동

김진,한정호,이덕현,김영식,노희숙,김근홍,김정수 安東大學校 工業技術硏究所 1999 공업기술연구논문집 Vol.6 No.1

가공열처리에 의한 결정립계조절 개념을 이용하여 Alloy 600 재료의 결정립계특성과 입계부식 거동을 조사하였다. 가공열처리에 따른 결정립계특성 변화를 EBSP로 분석하였으며, 결정립계특성 변화가 입계부식 거동에 미치는 영향을 평가하였다. 가공열처리 반복에 따라 각 단계별 CSL 입계의 분율이 크게 증가 할 것으로 예상하였으나, 변화가 두드러지지는 않았다. 그러나 상용재료에 비하여 가공열처리 된 시편은 CSL 분율이 약 10% 이상 향상된 결과를 얻었고, 입계부식 저항성이 증가하였다. 가공열처리된 시편의 각 단계별 CSL 분율 변화가 두드러지지 않았음에도 불구하고 입계부식 저항성이 향상된 것은, 결정립계의 'fine tuning' 기구가 이러한 부식거동변화에 작용한 것으로 해석할 수 있었다. Grain boundary properties and intergranular corrosion behavior of Alloy 600 material were investigated using the concept of grain boundary control by thermomechanical treatment(TMT). The grain boundary character distribution(GBCD) was analyzed by electron backscattered diffraction pattern. The effects of GBCD variation on intergranular attack(IGA) was evaluated. Changes in the fraction of coincidence site lattice(CSL) boundaries in each cycle of TMT process were expected to increase remarkably, but they were not distinguishable. But the total CSL boundary frequencies for TMT specimens increased about 10% compared with those of the commercial Alloy 600 material. It was found from IGA tests that the resistance to IGA was improved by TMT process. It is considered that these corrosion characteristics in TMT specimens is attributed to 'fine tuning of grain boundary' mechanism.

금속 재료의 부식에 미치는 해수의 영향

김영식 安東大學校 工業技術硏究所 1994 공업기술연구논문집 Vol.1 No.1

Sea water is the only electrolyte containing a relatively high concentration of salts that occurs commonly in nature, covering as it does over two-thirds of the earth's surface. It is both the most familiar and one of the most severe of natural corrosive agents. Ocean seawater is roughly equivalent in strength to a 3.5 w/o solution of sodium chloride, but it has a much more complex composition, embodying a number of major constituents, and traces at least of almost all naturally occurring elements. The corrosion damages of metallic materials by sea water depend upon several factors as like chloride ions, temperature, flow rate, alloying elements et at. This paper deals with the review on the nature of sea water, the effect of sea water on the corrosion behavior of metallic materials, and the methods of corrosion control.

Hierarchical Interconnection Network based on the ATM Switch for Multicomputer Systems

Kwon, Bo-seob 安東大學校 工業技術硏究所 1999 공업기술연구논문집 Vol.6 No.1

메시지 기반 멀티컴퓨터시스템에서는 빠른 프로세서간 통신이 필요하다. 다양한 프로세서간 통신방법중에서 본 논문은 비동기 전송모드(ATM) 스위치를 사용하여 낮은 지연시간과 높은 처리율을 얻을 수 있는 방법을 제안한다. 이 구조는 프로세서간 통신을 셀 크기로 전송하고, 셀들의 멀티플렉싱과 디멀티플렉싱을 담당하는 셀 인터페이스 모듈을 둔 계층적 구조를 가지고 있다. 라우팅 전략은 스위칭 라우팅 정보, VPI, VCI로 사용한다. In a message-based multiprocessor system that consists of message-communicating processors, the interconnection network is really a crucial part for fast processor communication. Among various interconnection methods, using the high-speed asynchronous transfer mode(ATM) switch is an attractive approach to constructing large-scale multiprocessor systems with low latency and high throughput. The interconnection network for fast processor communication is proposed in this paper. For the efficient use of the ATM switch, a group of the cell interface module(CIM) called a cell router which performs cell multiplexing and demultiplexing, is located between the processors groups and the ATM switch. In this proposed system, an expanded internal cell format in which three bytes are added for the switch routing information, is used. The interconnection network uses three routing strategies: the ATM switch routing using the switch routing information, the cell router routing using the virtual path identifier(VPI), and the cell reassembly routing using the virtual channel identifier(VCI). The interconnection network consists of an N×N folded switch and N cell routers.

지능형 고장진단 시스템 개발

배용환 安東大學校 工業技術硏究所 1998 공업기술연구논문집 Vol.5 No.1

This paper describes fault diagnosis method in complex system with hierarchical structure similar to human body structure. Complex system is divided into unit, item, component. For diagnosing this hierarchical complex system, it is necessary to implement special neural network. Fault diagnosis system can forecast faults in a system and decide from current machine state signal information. Comparing with other diagnosis system for single fault, the developed system deals with multiple fault diagnosis, comprising Hierarchical Neural Network(HNN). HNN consists of four level neural network, first level for item fault symptom classification, second level for item fault diagnosis, third level for component symptom classification, forth level for component fault diagnosis. UNIX IPC(Inter Process Communication) is used for implementing HNN with multitasking and message transfer between processes in SUN workstation with X-Windows(Motif). We tested HNN at four units, seven items per unit, seven components per item in a complex system. Each one neural network represents a separate process in UNIX operating system, information exchanging and cooperating between each neural network was done by message queue.

낙동강수계 댐 방류량에 의한 하류부의 영향 분석

신사철 安東大學校 工業技術硏究所 1998 공업기술연구논문집 Vol.5 No.1

A simulation system of rainfall-runoff is constructed to improve the ability of decision making for flood control for the downstream region of multipurpose dams in the Nakdong River. The system is the hydrological runoff model based on Storage Function method. The hydrological network model is composed of 41 subbasin runoff and 28 channel routing components. The hydrographs simulated by this system were compared with the observed records at the main stream gauging stations. In this study, 89 flood events of 12 gauging stations having reliable rating curves were analyzed to evaluate parameter sets of the Storage Function method. Parameter estimation equations were suggested for ungauged sub-basin by applying regional analysis. Averaged parameter values for 12 gauging stations and geophysical parameters such as watershed area, length and slope of main stream, and average slope of basin were used in this analysis. As a result of application for storm events by using the derived parameters, the flood prediction along the typical gauging stations showed good results.