콘크리트용 잔골재로서 고막 패각의 활용성에 관한 연구

신용석,이설,김판선,조철희,김정섭 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)

1) As a result of compressive strength experiment, rupture compressive strength showed more increases in specimens of 15% and 20% of Cockle shells in those of non-mixture. Comparing compressive strength between no-mixed Specimens and Specimens of containing Cockle shells, Specimens containing Cockle shells showed higher strength in 60 days of age, and as ark Cockle is contained and age is elapsed, compressive strength is also increased. 2) To sum up the above experimental results, it is found that using splitted Cockle shells as aggregate for concrete by 10% - 20% showed the same or higher compressive strength and shear strength as concretes using general aggregate and it can be used as substitute aggregate of concrete. It is considered that for future use of splitted Cockle shells as substitute concrete aggregate, continuous researches of its durability, applicability and economy are needed.

先加力 후 補修-補强한 鐵筋콘크리트 壓縮部材의 構造特性에 관한 實驗的 硏究

신용석,최진석,김판선,조철희,손순채,김정섭 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)

This study examined the Stress and structural characteristics of reinforced concrete compressive member repair and strengthening by CFS and GFS after pre-loading. The following results were obtained. The results of compressive testing by the kind of fiber suggested that: In CFS, Specimen increased by about 26.9% and strengthening after pre-loading, by about 111.8%, compared with after strengthening, In GFS, Specimen increased by about 69.0% and repaired and models after pre-loading, by about 76.7%, compared with after strengthening. In the compressive testing, strengthen with CFS-Specimen showed a brittle fracture and strengthen with GFS-Specimen represented ductile fracture. More increasing in stress of Specimen, and repair and Strengthening specimen after pre-loading than loading specimen after strengthening suggested the strengthen effect of fiber.

유한요소법을 이용한 Universal Motor의 최적 설계 연구

申判錫 홍익대학교 산업기술연구소 1998 産業技術 Vol.8 No.-

This paper proposed an optimized universal motor for improving its performance and cost using FEM program. To do this various design parameters are set such as airgap length, shape of stator and pole shoe, rotor slot, rotor shaft diameter, stator yoke shape, balancing method, etc. Flux2d program, which is a commertial packge for electromagnetic field analysis, is used to calculate the performance of the universal motor. The various parameters are useful to find an optimum shape of the universal motor. The simulation result has brought an optimized shape of the universal motor and its performance is much better compared with those of the initial model. The final optimized model showed that the weight of the core is reduced by 11 [%] and the efficiency is improved by 5.0 [%]. The FEM analysing method would be a good application tool to improve various types of motors and other actuators.

최적화 기법을 이용한 AC Servo Motor의 최적 형상설계

申判錫,白制勳 홍익대학교 산업기술연구소 1997 産業技術 Vol.7 No.-

This paper proposed the multi-1.2.objective shape optimization method of the closed type AC servo motor to minimize the cogging torque and to maximize efficiency. The field analysis is performed by finite element method and multi-objective programming using constrain method. To find a noninferior solution an advanced evolution strategy are employed In order to make a practical optimized design and faster convergence of the calculation 2 constrains are used ; the one is maximum cogging torque of 0.1[N.m] and the other is minimum efficiency of 90[%] The simulation result has brought an optimized shape of the motor and its performance is compared with those of the initial model. The final optimized model showed that the cogging torque is reduced by 46[%] and the efficiency is improved by 3.55[%] The multi-objective shape optimization algorithm would be a good application tool to design various types of motors and other actuators

역유한요소법을 이용한 2차원 도전율분포 예측 Program 개발

申判錫 홍익대학교 산업기술연구소 1994 産業技術 Vol.4 No.-

A simulation program of impedance computed tomography is developed to reconstruct an image of the conductivuty distribution for an interseted region such as two phases flow pipe human body electric insulation devices etc For the implementation of the inverse FEM program a 2-dimensional simulation model. which has 21 nodes and 28 elements is employed and calculated nodal potential agreement with those of the expected values. The diagnostic purpose such as impedance plethysmography phase monitoring system measurement system of blood mass. etc. will be the field applications of the technique.

유한 및 경계 요소 합성 Program을 이용한 전자장 수치 해석

申判錫,權炳徽 홍익대학교 산업기술연구소 1994 産業技術 Vol.3 No.-

The Finite element-boundary element method has been developed to provide an effective tool for the design and analysis of time harmonic electromagnetic field problems. Finite element methods are used to represent the interior region which has sources and structures, and boundary elements are used to represent the boundary and can be used to evaluate the far-field. For implementation of the hybrid program, the Galerkin weighted residual mthod is employed using the second order triangular elements, and the boundary integral method is evaluated using the point matching method. A Vlasov-type microwave antenna has been modeled and analysed using the program

FEM을 이용한 Amorphous 변압기의 최적 설계 및 해석 기법 연구

申判錫 홍익대학교 산업기술연구소 1995 産業技術 Vol.5 No.-

This paper presents a finite element program to analyse magnetic field of amorphous core transformer which is used a Fe-B-Si ribbons. Galerkin's weighted residual method is employed to formulated the governing equation of vector potential and eddy current in the transformer. For verifing the program and simulation method a butt-lap-step joint type to lamination method for amorphous metal transformer is modeled. Using the FEM program the interested parameters of the configuration such as the number of ribbon/group groups/set overlap length airgap length and flux density are investigated and derived a trend optimum design parameters.

유한요소법을 이용한 초전도 발전기의 자계해석

申判錫 홍익대학교 산업기술연구소 2001 産業技術 Vol.11 No.-

By using a 3-dimensional FEM program, the effective length of the 30-kVA superconducting generator is estimated for providing a valuable information to machine designer. Scalar and vector potential formulations are employed for 3D FEM program. Flux linkage of the stator coil is calculated with the FEM program and the induced voltage is computed using the Faraday's law. In the case study of the 30-kVA superconducting generator, the simulation results are compared with those of 2D FEM and those of the measured, which are reasonably good agreement with each other. Finally, the effective length of the 30-kVA superconducting generator is estimated using the calculated voltage and the geometric configuration of the machine. As the results of the simulation, the effective length of the generators stator coil is estimated about 350 mm in case of the 30-kVA generator. The estimated effective length will be very useful to redesign the final model of 30-kVA generator. Further works seem to be necessary to verify the program and the estimation method by applying to the several cases of large generators.

고조파 저감용 특수 변압기의 설계 및 해석 연구

申判錫 弘益大學校 産業技術硏究所 2004 産業技術 Vol.14 No.-

AIn order to minimize current harmonics, a zero-phase neutral line current eliminating reactor (NHER) is designed and analyzed its performance using the finite element program. For the design of NHER, a program is developed using C++ language. To verify the program a case model(380/220V, 200A) is designed and analyzed by the developed program. The performance is also reviewed by the FEM program, FLUX2D. For the optimal design of NHER, several algorithms are suggested in the program to minimize the leakage inductance, the core and coil losses. As the results of the optimal design, the core loss is reduced by 26 % with eliminating of the current harmonics. Especially the ninth harmonics is much reduced as compared with the others. When the design of NHER is adapted to the load of the power system, the eliminating effect and efficiency of the device will be much better

고도정수처리 공정에서의 천연유기물질 특성변화 및 소독부산물 전구물질의 제거특성 평가

노재순,손희종,박은주,황영도,최동훈,배석문,신판세 慶星大學校 環境問題硏究所 2002 環境硏報 Vol.12 No.1

In this research the movement and apparent molecular weight distribution of hydrophilic/hydrophobic organic matters in advanced water treatment process were investigated using the raw water of Maeri area, located in downstream of Nakdong river, and the variation of the disinfection by-product formation potential was also investigated. In the raw water used in experiments, the content of BDOC (biodegradable dissolved organic carbon) in dissolved organic carbon (DOC) was about 39%, and this value is far above a normal, Pre-ozone treatment showed an increase of 40% in the BDOC content, and this means that biodegradability was remarkably increased by ozone treatment BDOC concentration in BAC treated water was 0.09 mg/L, which means 84% of BDOC removal rate compared with that in post-ozone treated water. The variation of chlorine disinfection by-product formation potential in each process unit of water treatment process was analyzed. TOXFP concentration in raw water was 449 ㎍/L, and the contents of THMFP and HAAFP among TOXFP were 24% and 23%, respectively. The removabilities of these materials BAC process had an order of TOXFP > HAAFP > THMFP. BAC process was less effective for THMFP than others. The distribution of hydrophilic organic matters were evaluated in each treatment process. Hydrophilic and hydrophobic matters in the raw water had a ratio of 50 : 50, and the ozone treatment decreased the content of hydrophobic matters. The BAC treatment made the ratio 85:15. These mean that the removal of hydrophilic matters is more difficult than that of hydrophobic materials in water treatment process. In addition the portions of humic and fulvic acid in hydrophobic matters were analyzed. Fulvic acid a large portion among hydrophobic matters in the raw water, and the portion was 78%. Ozone treatment was more effective on the removal of fulvic acid than humic acid. After BAC treatment, the concentration of residual fulvic acid was high than humic acid. Chlorine disinfection by-product formation for hydrophilic and hydrophobic mattrts was compared in each process unit. in the raw water TOXFP and THMFP formation for hydrophobic matter was higher, and HAAFP was highly formated for hydrophobic matter. After post-ozone or BAC treatment, chlorine disinfection by-product formation has high potential for hydrophobic matters. Comparing humic and fulvic acids, chlorine disinfection by-product formation potential was higher for humic acid than for fulvic acid in all processes. In the comparison of the reactivity with chlorine disinfection by-product per unit DOC, THMFP and DOXFP showed higher reactivity with hydrophobic matter than with hydrophilic matter in all processes, and HAAFP was highly reacitive with hydrophilic matter. Apparent molecular weight distributions of organic matters were investigated in each process step.The content of low molecular weight organic matters less than 1000 Da in DOC was high in all processes except raw water, but molecular weight organic matters more than 1000 da was higher than molecular weight organic matters less than 1000 Da in the formation potential of chlorine disinfection by-product.