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부창진,김호찬,강민제 제주대학교 공과대학 첨단기술연구소 2005 尖端技術硏究所論文集 Vol.16 No.1
Electrical resistance tomograpy(ERT) maps resistivity values of the soil subspace and characterizes buried objects. The characterization includes location, size, and resistivity of buried objects. In this paper, we have made numerical experiments to compare the performance of the Wenner, Schlumberger, pole-pole, and dipole-dipole electrode arrays for two-dimensional resistivity measurement in ERT. In general, the SNR(signal to noise ratio) of resistivity measurement is directly to the measurement voltage level. The pole-pole and Wenner arrays can give the highest signal level. Results of numerical experiments in ERT solved by four electrode array types are presented and compared using Gauss-Newton inversion algorithm.
부창진,김호찬,이관우 제주대학교 공과대학 첨단기술연구소 2006 尖端技術硏究所論文集 Vol.17 No.1
The accurate measurement of soil resistivity and grounding system resistance is fundamental to electrical safety. However, geological and meterological factors can have a considerable effect on the accuracy of conventional measurements and the validity of the measurement methods. This paper presents optimization method of dc resistivity data acquisition system using Wenner and Schlumbeger method.
부창진,김호찬,이관우 제주대학교 공과대학 첨단기술연구소 2006 尖端技術硏究所論文集 Vol.17 No.2
The grounding system of the subsurface should ensure the safe and reliable operation of power systems, and guarantee a human being's safety in the situation of grounding fault in the power system. The optimal design of grounding systems for subsurface can ensure the equalization of the potential distribution of the ground surface above the grounding system, and can obviously improve the safety of the grounding system. This paper deals with the 2-dimensional reconstruction of the earth's resistivity distribution based on DC resistivity data. This task represents a nonlinear and ill-posed minimization problem with many degrees of freedom. In this work, techniques for regularization and controlling of this problem are depicted and classified. The system of equations as resulting from the application of the Gauss -Newton minimization can be solved efficiently.
부창진,김호찬,김문찬,이윤준 제주대학교 공과대학 첨단기술연구소 2004 尖端技術硏究所論文集 Vol.15 No.2
Electrical resistance tomograpy (ERT) maps resistivity values of the soil subsurface and characterizes buried objects. The characterization includes location, size, and resistivity of buried objects. In this paper, simultaneous iterative reconstruction technieque (SIRT) and truncated least squares (TLS) approach are presented for the solution of the ERT image reconstruction. Results of numerical experiments in ERT solved by the SIRT and TLS approach are presented and compared to that obtained by the Gauss-Newton method.
생분해성 플라스틱이 포함된 유기성 생활 쓰레기의 퇴비화
신창호,김영진,이상일,장상희,조무환,신부영 영남대학교 환경문제연구소 2000 環境硏究 Vol.19 No.2
준 생산용 퇴비화 장치를 이용하여 생분해성 플라스틱을 포함하는 유기성 도시생활쓰레기기의 퇴비화를 연구하였다. 유기성 도시생활쓰레기는 실제 도시생활쓰레기 구성비에서 무기물을 제외한 유기성 물질만의 비로 만들어 사용하였다. 유기성 도시생활쓰레기를 구성하는 각각의 물질에 대한 생분해도를 ISO법으로 측정하였고, 퇴비의 화학적 물리적 특성도 조사하였다. 구성 물질에 대한 생분해도 결과에서, 생분해성 고분자를 포함한 각 물질들은 퇴비화에 충분한 생분해도를 나타내는 것으로 밝혀졌다. 또한, 유기성 도시 생활쓰레기로부터 비독성의 퇴비를 얻을 수 있음을 알았다. The composting study of organic municipal solid waste containing biodegradable plastic was performed by using pilot scale composting apparatus. The organic municipal solid waste(OMSW) was artificially prepared for composting. The composition of artificial OMSW was the same as that of real municipal solid waste excluding inorganic waste. The biodegradability of individual component of OMSW was studied according to the ISO method. The chemical and physical characteristics were also observed. Biodegradability study revealed that every component of OMSW including biodegradable plastic had sufficient degradability for real composting. And it was found that non-toxic compost could be produced from OMSW containing biodegradable plastic.
강부성,박진호 대한건축학회 2004 대한건축학회논문집 Vol.20 No.5
The Block Housing Type is coming to fore as a 'low-rise high-density housing type', which can resolve the all sorts of problems caused in Korean apartment housing complex and single-detached residential area in terms of livability, urbanity, and community. To analyze the characteristics of the block housing, the block housing in Makuhari Bay Town in Japan was analyzed as a sample for Post Occupancy Evaluation. The analysis shows that the block housing is useful low-rise and high-density housing type, which ensures the livability as well as the urbanity and community. In details the analysis also shows the user satisfaction from the perspective of living and facility use within the block housing and individual unit. The various activities like reading, exercise, conversation, rest etc were done in the courtyard of the block housing, and the facilities needed in the courtyard are defined. And the public street formed by block housing has liveliness and pleasantness even though it reveals the problem of noise and issue of safety caused by vehicles.
Polycaprolactone(PCL)/탄산칼슘 복합체의 물성 및 내후성 연구
김영진,신창호,신부영 영남대학교 공업기술연구소 1999 工業技術硏究所論文集 Vol.27 No.2
Polycaprolactone(PCL)/Master Batch(MB) composite was made by blending PCL and MB. The major component of MB is calcium carbonate(CaCO3). Wheatherability, thermal properties, mechanical properties and water absorption were investigated in PCL/MB composite. Stress and strain at break were decreased but Young's modulus was comparatively maintained as the time of outdoor exposure was increased. The mechanical properties of PCL/MB composite were decreased as the content of MB was increased and the parallel samples were better than transverse samples in stress at break, strain at break and Young's modulus. The melting temperature of PCL/MB composite was about 57℃. The water absorption of PCL/MB was higher than PCL. but the change of water absorption by the content of MB could be ignored because the total water absorption of PCL/MB composite was not reached at 1%.
김호찬,부창진,이윤준 제주대학교 공과대학 첨단기술연구소 2002 尖端技術硏究所論文集 Vol.13 No.2
Electrical impedance tomograpy(EIT) determines the resistivity distribution inside an inhomogeneous target by means of voltage and current measurements conducted at the target boundary. In this paper, a simultaneous perturbation stochastic approximation(SPSA) approach is proposed for the solution of the EIT image reconstruction. Results of numerical experiments of EIT solved by the SPSA approach are presented and compared to that obtained by the modified Newton-Raphson(mNR) method.
Taylor 모델을 이용한 역동역학 뉴로제어기의 설계와 전력계통 안정화장치에 적용
김문찬,부창진,김호찬 제주대학교 공과대학 첨단기술연구소 2003 尖端技術硏究所論文集 Vol.14 No.2
This paper presents an implementation of power system stabilizer using inverse dynamic neuro controller. Traditionally. mutilayer neural network is used for a universal approximator and applied to a system as a neuro-controller. In this case. at least two neural networks are used and continuous tuning of neuro -controller is required. Moreover, training of neural network is required considering all possible disturbances, which is impractical in real situation. In this paper,Taylor Model Based Inverse Dynamic Neuro Model (TMBIDNM) is introduced to avoid this problem. Inverse Dynamic Neuro Controller(IDNC) consists of TMBIDNM and Error Reduction Neuro Model(ERNM). Once the TMBIDNM is trained. it does not require retuning for cases with other types of disturbances. The controller is tested for one machine and infinite-bus power system for various operating conditions.