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10MgO-10Fe_2O_3-30Na_2O-5OSiO_2 유리의 Mo¨ssbauer 효과 연구
홍치유,박관호,백승도,문찬호,조수열 동국대학교 1987 論文集 Vol.26 No.-
The Mo¨ssbauer effect studies of the quenched glass and heat-treated glasses were performed. The Debye and Einstien temperatures of the quenched glass, determined using the center shift and kinetic temperature, are 540K and 430K respectively. The X-ray diffraction pattern showed that the heat-treated glasses were crystallized. Form the isomer shift of the heat-treated glasses, it was concluded that the Fe^(3+) ion is predominantly octahedrally coordinated.
Mo¨ssbauer 분광법을 이용한 10MnO_2-10Fe_2O_3-30Na_2O-50SiO_2 유리내의 Fe^3+ 이온에 관한 연구
洪致裕,朴冠鎬,白承道,洪性樂 동국대학교 1986 論文集 Vol.25 No.-
We have studied the Mo¨ssbauer parameters for Fe^(3+) ion in the quenched glass and heat treated glass and heat treated glasses. The Mo¨ssbauer spectra of the quenched glass were investigated at various temperatures from 60K to 300K. Using the center shift and kinetic temperature, the Debye and einstein temperatures were calculated. The quenched glass was heat-treated at various temperatures from 530℃ to 710℃ for five hours. Both the isomer shit and quadrupole splitting parameters decreased near 590℃. And regardless of heat treatment, the Fe^(3+) ion was predominantly octahedrally coordinated.
Mossbauer 분광법을 이용한 10MnO₂-10Fe₂O₃-30Na₂O-50SiO₂유리내의 Fe³+ 이온에 관한 연구
朴冠鎬,洪性樂,洪致裕,白承道 濟州大學校 基礎科學硏究所 1988 基礎科學硏究 Vol.1 No.1
We have studied the Mossbauer parameters for ?? ion in the quenched glass and heat treated glasses. The Mossbauer spectra of the quenched glass were investigated at various temperatures from 60K to 300K. Using the center shift and kinetic temperature, the Debye and Einstein temperatures were calculated. The quenched glass was heat-treated at various temperatures from 530℃ to 710℃ for five hours. Both the isomer shit and quadrupole splitting parameters decreased near 590℃. And regardless of heat treatment, the ?? ion was predominantly octahedrally coordinated.
허관도,여홍태 동의대학교 산업기술개발연구소 2001 産業技術硏究誌 Vol.15 No.-
This study is concerned with the analysis of deformation to make an aluminum long-neck flange by cold extrusion and upsetting processes. The process of deformation was analysed using DEFORM(a commercial rigid-plastic FEM code) to get informations such as distributions of effective strain, metal flow and the relationship between load and punch stroke on the variation of semi-extrusion angle. The diameter ratios of a prestressed die with one stress ring have been also considered to determine the dimension of each ring. In the results, it is found that the initial extrusion load as well as the final load increases according to the increase of semi-extrusion angle. Especially, at the final extrusion stage, the increase of semi-extrusion angle makes high the effective strain near the outer surface of workpiece along the longitudinal direction, but punch stroke is decreased. In flange forming by upsetting process, the variation of semi-extrusion angle does not affect much forming load, but the increase of semi-extrusion angle reduces the region of high deformation and punch stroke. It is also found that the maximum separated distance from mandrel to workpiece is linearly decreased by increasing semi-extrusion angle. Therefore, it is possible to control the parameters such as forming load, punch stroke, and effective strain, which have effect on the manufacturing process and product quality, by changing semi-extrusion angle.
통계적 기법을 이용한 마이크로 스피커 다이아프램의 최적형상설계에 관한 연구
안찬우,홍도관,최재기,박진우 東亞大學校附設 生産技術硏究所 2007 生産技術硏究所硏究論文集 Vol.12 No.-
This study uses response surface methodology to explain correlations between the objective function and design variables, fractional factorial design and central composite design were carried out. The change of shape of diaphragm, thickness of diaphragm and voice coil weight based on fractional factorial design and central composite design are made. Therefore this study carried to decide design variables for minimizing 1st natural frequency and maximizing 2nd natural frequency of diaphragm using response surface methodology and screening(fractional factorial design), we showed improved design variables.
안찬우,김동영,홍도관 동아대학교 환경문제연구소 1998 硏究報告 Vol.21 No.2
In a number of cases it appears expedient to install several absorbers of smaller masses instead of one. This may be due to the need to distribute the absorber's response along the construction, restrictions on the absorber's installation and transportation and other reasons. The application of multimass absorbers is not limited to protection from harmonic actions. The complete optimization of the absorber's parameters reduces to resonance amplitude. So, we studied characteristic of main vibration system and multi dynamic absorber's system for the optimal natural frequency ratio and damping ratio of multi dynamic absorber. Also we obtain the optimization of the multi dynamic vibration absorber's parameters using computer simulation for the damped main vibration system. In designing multi dynamic vibration absorber, we are presented for the optimum values of the mass, spring constant and damping coefficient of multi dynamic vibration absorbers.
야뇨증 환아들의 심리사회적 특성에 대한 다기관 연구 : 행동 및 정서 문제를 중심으로
조수철,김재원,신민섭,황준원,한상원,박관현,이상돈,김경도,김건석,서홍진,이유식,정재용,김영균,문두건,남궁미경,한창희,조원열,김영식,배기수,이종국,정우영,신의진 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.6
Objectives : The aim of this study was to examine the behavioral and emotional problems associated with nocturnal enuresis in Korean children. Methods : Three hundred eighteen children with nocturnal enuresis, together with their parents, completed the Child Behavior Checklist (CBCL), Disruptive Behavior Disorder Scale according to DSM-IV (DBDS), Children's Depression Inventory (CDI), State-Trait Anxiety Inventory for Children (STAIC), and Piers-Harris Children's Self-Concept Scale (PHCSC). Ninety-three normal students were selected as the control group. Results : Compared to the normal control group, the mean scores with regard to the withdrawn, social problems, attention problems, delinquent behavior, aggressive behavior, externalizing problems and total problems profiles were significantly higher in the nocturnal enuresis group according to the CBCL results. The nocturnal enuresis group also scored significantly higher in the ADHD and ODD profiles of the DBDS. The nocturnal enuresis group was more depressed and anxious than the control group according to the results of the CDI and STAI. The mean score of the PHCSC was significantly lower in the nocturnal enuresis group when compared to the normal control group. Conclusion : The results of this study suggest that children with nocturnal enuresis in Korea have clinically relevant behavioral and emotional problems. The findings support the link between nocturnal enuresis and psychopathology in Korean children.
Rotordynamics of 120 <tex> $\thinspace$</tex>000 r/min 15 kW Ultra High Speed Motor
Do-Kwan Hong,Byung-Chul Woo,Dae-Hyun Koo IEEE 2009 IEEE transactions on magnetics Vol.45 No.6
<P>This paper introduces a rotor with shrink fit and analyzes its rotordynamics by 3-D FEA. An ultra high speed motor prototype is manufactured for fuel cells at the rating of 15 kW, 120000 r/min. First, the stability of the rotor structure with shrink fit is evaluated in non-loading and loading condition (120 000 r/min, 210degC). And then the 3-D rotordynamics analysis and Campbell diagram considering shrink fit are examined for the critical speed of rotor. The analysis shows that the critical speed of the rotor is higher when the rotor is shrink fitted than when the rotor is not shrink fitted. The analysis also shows the increase of shaft stiffness when the rotor is shrink fitted.</P>
Investigating a Direct-Drive PM Type Synchronous Machine for Turret Application Using Optimization
Do-Kwan Hong,Ji-Young Lee,Byung-Chul Woo,Doo-Hwan Park,Byoung-Uk Nam IEEE 2012 IEEE transactions on magnetics Vol.48 No.11
<P>This paper proposes an outer rotor and spoke type longitudinal flux direct-drive machine with advantages such as high precision, robustness, reliability, no backlash and a simple structure for large diameter turret applications. This paper deals with the optimum design using Latin hypercube sampling (LHS) with the many design variables of the developed motor. The effective design variables are selected by screening using an analysis of means (AMOM). This paper presents an optimum design for maximum torque and efficiency with the constraints of torque ripple ratio and maximum current using response surface methodology (RSM). The simulation results are compared with the experiment, and are within a 3% deviation of each other in the first prototype. All design performances of the second prototype are verified successfully. The predicted optimum design performances are consistent with the simulation results with a maximum error of 0.283%.</P>