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정병만,백세종,오희균 全南大學校 師範大學 科學敎育硏究所 2003 科學敎育硏究誌 Vol.27 No.1
The qualitative interpretation about the conservation of energy and linear momentum of stimulated Brillouin scattered light is formulated and the nonlinear phenomena of stimulated Brillouin scattering is derived. In addition, We have interpreted the basic theory of Brillouin optical time domain analysis (BOTDA) by use of the energy relation between the pumping light and the probe light. Through these processes we can obtain the high distance-resolution and fiber strain measurement.
정병만,남기문,강석현,이창하,최대기 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
Adsorption equilibria of the gases H2, CH4, and C2H4 and their binary and ternary mixtures on activated carbon (Calgon co.) have been measured in the pressure range of 0 to 2 MPa at temperatures of 293.15, 303.15, and 313.15K. Measurements were made using a volumetric method, coupled with gas chromatographic analysis of the gas-phase compositions. From the parameters obtained from single component adsorption isotherm, multi-component adsorption equilibria could be predicted and compared with experimental data. Ideal Adsorbed Solution Theory (IAST) showed the best agreement with the experimental results for binary and ternary adsorption equilibria of H2, CH4, and C2H4 on activated carbon.
정병만,심문식 全南大學校 師範大學 科學敎育硏究所 2002 科學敎育硏究誌 Vol.26 No.1
A many-body theory of a two-dimensional (2-D) electron gas in a weak magnetic field is presented. The field dependence of the Fermi momentum consists of the spin -dependent paramagnetic part and the orbital diamagnetic part. The former increases more strongly with rs than the latter. The paramagnetic and diamagnetic susceptibilities are found as functions of rs. The pair distribution function with a weak a magnetic field is evaluated by using the propagator of the 2-D electron gas system. And the exchange effects at high and low temperatures are considered and some thermodynamic quantities such as the susceptibility are evaluated.
Adsorption Equilibrium of Methane, Hydrogen and their mixture gas on Activated Carbon
정병만,남기문,강석현,이창하,최대기 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1
Adsorption equilibrium of CH4, H2 and mixture gas were measured to use the static volumetric method at 293.15k, 303.15k and 313.15k. The experiment was performed to use the activated carbon as an adsorbent(Calgon co.) and the mixture gas (hydrogen 80%, methane 20%) as an adsorbate. Adsorption data of pure gas are correlated using Langmuir, Langmuir-Freundich and Toth, Unilan isotherm equation. The experiment data were fitted very well with Langmuir-Freundlichisotherm equations. Binary component adsorption could be predicted from the parameters obtained single component adsorption isotherm. Also binary component adsorption could be compared with experimental data.
정병만,오희균 全南大學校 師範大學 科學敎育硏究所 2003 科學敎育硏究誌 Vol.27 No.1
The fiber-optic sensing system by use of the macrobending characteristics is specified. This system is applicable to the big structures. And it is possible to develop three measuring sensors of high perforrnance criterion on the displacement, inclination, and vibration. As a resu1t, a simple and efficient sensing system pertinent to the health-monitoring of structures is certified.
영상의 전역 특징과 이동객체의 지역 특징을 융합한 동영상 검색 디스크립터 설계
정병만,이규원,Jung, Byung-Man,Lee, Kyu-Won 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.1
실시간으로 입력되는 영상으로부터 이동객체의 움직임 특징을 이용하여 움직임 분석에 적합한 디스크립터를 제안한다. 배경과 이동객체를 분리하기 위하여 배경학습을 행한다. 연속적으로 추출된 이동객체의 1차 모멘트를 이용하여 각 객체별로 이동 궤적을 추출한다. 연결 리스트를 이용하여 객체별로 추출된 1차 모멘트를 관리한다. 디스크립터는 격자 형태로 미리 지정된 9개의 지점 근방에 포함되는 이동객체의 1차 모멘트 좌표와 객체가 화면에 출현하는 시작 프레임 번호, 화면에서 사라지는 마지막 프레임 번호로 구성된다. 제안하는 전역 및 지역 특징 융합 디스크립터에 의한 비디오 검색은 둘 중 하나의 특징을 사용하는 기존의 방법에 비하여 효과적임을 확인하였다. A descriptor which is suitable for motion analysis by using the motion features of moving objects from the real time image sequence is proposed. To segment moving objects from the background, the background learning is performed. We extract motion trajectories of individual objects by using the sequence of the 1st order moment of moving objects. The center points of each object are managed by linked list. The descriptor includes the 1st order coordinates of moving object belong to neighbor of the pre-defined position in grid pattern, The start frame number which a moving object appeared in the scene and the end frame number which it disappeared. A video retrieval by the proposed descriptor combining global and local feature is more effective than conventional methods which adopt a single feature among global and local features.
정병만,백세종,오희균 全南大學校 師範大學 科學敎育硏究所 2003 科學敎育硏究誌 Vol.27 No.1
We have designed a sensing system which is applicable to the structures by use of the fiber-optic Brillouin scattering sensor and have performed various experiments on this system. And we have certified that the relation between the Brillouin frequency shift and the strain is 20.79 μƐ/GHz. We have proposed a method of one distributed feedback laser diode and two electro-optic modulators for more stable frequency control.
정병만,오희균 全南大學校 師範大學 科學敎育硏究所 2003 科學敎育硏究誌 Vol.27 No.1
The components of fiber-optic sensing system which is applicable to the structures are specified. And the so-called spatial displacement sensor of high performance criterion using the method of light modulation is proposed. As a result, a simple sensing system on the displacement sensor pertinent to the health-monitoring system is certified.