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시멘트 종류별 콘크리트의 적산온도에 의한 강도예측에 관한 연구
장종호,나철성,김재환,김용로,길배수,남재현,김무한 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2
The purpose of this study is to exhibit fundamental data which can apply to quality and process management of structure concrete using special cement in the construction field investigating strength prediction by maturity method of concrete according to cement types. The activation energy value was derived from the experimental study that experimental factors were selected as W/C ratio of 45%, the kinds of cements of 3 levels of O.P.C, H.B.C, H.S.C and curing temperature of 3 levels of 5℃, 20℃, 35℃. Also, after investigating relationship between compression strength and equivalent ages of concrete according to cement types, the strength prediction was investigated by maturity method. As the above of results, differences between the prediction strength by strength prediction equation and the actual measurement strength were lower, therefore it is considered that the strength prediction by maturity method is possible not only concrete using normal portland cement but also concrete using special cement.
공간벡터 PWM의 과변조 영역에서 출력전압 선형화에 관한 연구
배장호,김연충,원충연 成均館大學校 科學技術硏究所 1999 論文集 Vol.50 No.1
This paper proposes a linearization technique for the space vector modulation method, which increases the linear control range of inverter up to the 6-step inverter. This method is based on fourier series expansion of the desired output voltage of the inverter to calculate the compensation angle in continuous switching mode and holding angle in discontinuous switching including the 6-step mode respectively. The numerical data of these angles which are used for compensation of fundamental voltage in overmodulation range. Therefore, it is possible to obtain the linear control and the maximized utilization of PWM inverter output voltage.
이배호,전용배,안장원 중앙대학교 기술과학연구소 1997 기술과학연구소 논문집 Vol.27 No.-
우리나라의 건설산업은 국내건설시장의 전면 개방과 표준품셈제도의 단계적 폐지와 같은 새로운 환경변화에 직면하고 있으며, 이러한 상황하에서 건설산업은 사고의 혁신과 기술혁신 필요하다. 선진국에서는 이 치열한 생존경쟁에서 살아남고 국가예산절감의 한 방편으로 가치공학을 통하여 큰 성과를 거두고 있다. 본 연구에서는 국가예산의 큰 비중을 차지하고 있는 건설공사에 대해서 미국, 일본과 우리나라의 가치공학변경제안제도, 시행 절차, 공사비절감 사례 등을 비교·분석하고, 국가예산절감을 위한 한 방편으로 공공공사에 대하여 가치공학변경제안제도를 활성화 시키고 나아가서 민간공사에서도 가치공학을 적극 활용할 수 있도록 하는 방안을 제시하고자 하였으며, 5가지의 방안을 제시하였다. The construction industry in Korea is confronted with new environment such as opening market for domestic construction and withdrawing of standard unit system. Under these circumstances, the construction industry needs technology and thought innovation. The developed countries is successful through Value Engineering(VE) in order to survive in this fierce struggle for existence and save national budget. This study tries to provide the encouragement of VE change proposal system to public construction projects as well as private construction projects with comparison and analysis of USA, Japan and Korean VE change proposal system, procedure and examples of saving budgets, and provides five alternative proposals.
석탄회로 합성한 제올라이트에 대한 암모니아성 질소 흡착특성 조사
류완호,이원묵,백일현,배장순 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.4
국내 석탄화력 발전소에서 폐기되는 석탄회를 이용하여 폐수 중 암모니아성 질소 제거용 흡착제를 제조하고자 NaOH를 반응물로 한 수열합성 반응을 이용, 제올라이트를 합성하였으며 제조된 제올라이트를 실제공정에 활용하기 위하여 흡착실험 및 공정모사를 수행하였다. 또한 흡착제를 구형으로 제조하여 암모니아성 질소의 등온 흡착 공정에 이용하였으며 이 결과 Langmuir식에 잘 일치함을 알 수 있었다. 고정층에서의 흡착 거동은 축 방향 분산흐름, 입자 내부에서의 표면 확산 및 Sips 흡착 등온식을 바탕으로 한 고정층 흡착모델의 주요 공정 변수에 대한 파과곡선을 잘 모사할 수 있음을 확인할 수 있었다. Zeolite was synthesized from coal fly ash produced by a domestic power plant and applied for the removal of ammonia from waste water. Zeolite was synthesized using a hydrothermal method involving an akaline reaction with NaOH, and adsorption experiments and simulations were conducted. Adsorption experiments with the pelletized spherical zeolite were carried out. The experimental data obtained from adsorption isotherms agreed well with the Langmuir equation. Also, most of the correlated results for the fixed bed model based on surface diffusion and Sips adsorption isotherms equation were consistent with the experimental data.
석탄회를 이용한 제올라이트의 합성 및 암모니아성 질소 흡착
류완호,박찬교,배장순 한국공업화학회 2004 공업화학 Vol.15 No.1
국내 석탄 화력발전소에서 폐기되는 석탄회를 이용하여 제올라이트를 합성하였으며, 이를 이용하여 폐수 중 암모니아성 질소 제거용 흡착제로서의 활용가능성을 조사하였다. 실험결과 산에 의한 전처리 과정이 중요하고, 4M-NaOH, 반응시간 4 h, pH 7~9.5에서 합성한 제올라이트가 가장 우수한 흡착성능을 보였으며, 이는 상업용 5A형 제올라이트와 비슷한 80%의 흡착성능을 보였다. Synthetic zeolite was prepared from coal fly ash which had been abandoned from a domestic power plant as wastes, and was investigated as an absorbent for removed of ammonia from the waste water. The results suggest that pH control step in the synthesis process was an important factor for the removal capacity due to the presence of alkaline materials such as CaO and MgO in fly ash. Accordingly the zeolite synthesized at 4 M-NaOH and 4 hrs under controlling the pH7-9.5 showed the removal efficiency of 80% as much as the commertial one at its highest ate.
만성정신질환자의 욕구에 대한 수요자(환자)와 공급자(치료자) 측면의 비교 연구
안강호,이종국,한은선,김명식,김장배,손봉희 대한생물치료정신의학회 2000 생물치료정신의학 Vol.6 No.1
Objectives : We performed this study to assess the needs of the chronically mentally ill(CMI) from the perspectives of the consumers(patients) and the providers(therapists) and to compare the differences between them. We also aimed to find met needs and unmet needs and then to determine the priority of the mental health services for the CMI. Methods : 165 patients and 19 therapists were examined with need assessment tool which had been developed by authors. Through statistical analysis, we evaluated the degree of problem, the degree of intervention, the relative degree of problem, and the degree of demand in each areas of needs, and compared the differences between patient group and therapist group. After then met needs and unmet needs from the perspectives of each group were revealed. Results : 1) There were differences in the assessment of needs between patients and therapists. 2) The more problem areas assessed by patients were finances, mental health, occupation, and leisure life in order of higher ranks. While occupation, leisure life, mental health, and finances were assessed as highly ranked problem areas by the therapist group. 3) Patients perceived that they were given more helps from others in the areas of mental health, physical health, accommodation, and relation to family than other areas. From the perspective of therapists, the areas of needs such as mental health, basic knowledge, occupation, and interpersonal retation were highly ranked intervention areas. 4) The demands for daily living skill, occupation, finances, accommodation were ranked highly by patient group. Highly demanded needs assessed by therapist group were mental health, occupation, interpersonal relation, and basic knowledge. 5) Unmet needs assessed by patient group were occupation, finances, and accommodation, while by therapist group, occupation. Conclusions : The needs of the CMI were assessed and identified by the consumers(patients) and providers(therapists) with the same tool. The differences between two groups were revealed. The most important unmet need of the CMI was occupation. These results can be used to plan the priority of mental health services and policies.