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오상균 한국건축시공학회 2004 한국건축시공학회지 Vol.4 No.2
The recycle of domestic waste concrete is, however, still in an early stage, and it has been only partially being used for the road fillers. As a counter-plan of activating recycled concrete, we have confirmed the hydration possibility of the waste concrete powder from the experiment on recycling the aggregate powder since 2000. Though that study, we have known that the strength is increasing when the baking time is longer, and baking temperature maintain in 700℃. Also, the quality is lowered because of the fine aggregate powder which has a bad influence on flowability & compression strength by adhesion of mortar on the aggregate face. Therefore, mortar and interfacial separation of aggregate are large in proper quality for concrete recycling is expected that affect.The purpose of this study is to investigate effective aggregate separation and to determine the most suitable production method controlling the duration of baking time for recycled cement from the compressive strength, X-ray diffraction and ingredient analysis test.
CBD 기반 RUP 모델을 이용한 연구관리 시스템의 구현
오상균,김은기 한밭대학교 2008 한밭대학교 논문집 Vol.6 No.1
본 연구에서는 CBD 기반의 RUP 모델을 이용하여 재 사용이 가능한 컴포넌트들을 설계하였으며, 이를 이용하여 연구관리 시스랩을 구현하였다. 이를 위하여 연구관리 시스템의 주요 사용자 인터페이스 인 둥록관리 및 변경관리를 위한 컴포넌트를 구성하였으며, 구성된 컴포넌트들은 관련 sw개발에 효율적 으로 재 사용될 수 있을 것으로 생각된다 This study is focused on the design of reusable components using RUP model based on CBD, and the research management system. using the model is implemented. For this, we have made components for the registration and modification management, that is the main user interface, and the components are considered to be efficiently reused for the development of related softwares.
오상균,김세훈,남지현 동의대학교 산업기술개발연구소 2005 産業技術硏究誌 Vol.19 No.-
Nowadays, it is a requirement to use high strength concrete for skyscrapers. Therefore safety research for high strength concrete is necessary. A fire outbreak in a reinforcement concrete structure looses the organism by the different contraction and expansion of hardened cement pastes and aggregate, and causes crack by thermal stress, leading to the deterioration of the durability. In this study, normal and high strength mortar were exposed to a high temperature environment. And than fundamental data for the character change of concrete heated highly were resented by measuring compressive strength of concrete with PP fiber and vinylon fiber, before and after heating. As the result, it is proven that adding PP fiber and vinylon fiber in high strength concrete for prevents deterioration of durability by fire.
초공간을 고려한 AISI 304강 열화신호의 카오스성 평가
오상균,안병욱 한밭대학교 생산기반기술연구소 2002 생산기반기술연구소 논문집 Vol.2 No.1
This study proposed the analysis and evaluation method of time series ultrasonic signal using the chaotic feature extraction for degradation extent. Features extracted from time series data using the chaotic time series signal analyze quantitatively material degradation extent. In this study, constructed strange attractor on hyperspace and got value using fractal dimension, Lyapunov exponent. The Lyapunov exponent is a measure of the rate at which nearby trajectories in phase space diverge. Chaotic trajectories have at least one positive Lyapunov exponent. The fractal dimension appears as a metric space such as the phase space trajectory of a dynamical system. In experiment, fractal(correlation) dimensions and Lyapunov exponents showed values of mean 3.837∼4.211 and 0.054∼0.078 in case of degradation material. The proposed chaotic feature extraction in this study can enhances ultrasonic pattern recognition results from degradation signals.
오상균 한국통신학회 1996 韓國通信學會論文誌 Vol.21 No.7
Recently, by emerging of the ALE techniques that make it possible to providereliable communications link automatically, high frequency communiation is newly used as emergency communication and back-up for satellite communications. ALE signal is transmitted in burst, and the received signal is subject to distortions by detrimental multipath fading channels. In the case of that channel, the performance of ALE system is highly dependent upon that of synchronization techniques. In this paper, M-ary FSK signals are detected by a bank of bandpass filter, which is implemented using recusive DFT(Discrete Fourier Transform). Also an acquisition and trancking algorithm are designed uisng parallel structure and early-late-gate methods respectively. Finally, we verify the performance ofthe proposed synchronization algorithm by the computer simulation.