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高强度 콘크리트의 工學的 特性에 미치는 잔골재율의 影響
김진만 공주대학교 방재연구센터 1997 공주대학교 방재연구센터 논문집 Vol.1 No.-
The utilization of high strength concrete(HSC) in the special structures is world wide trend. And it has been increased to apply high strength concrete to construction site our country. In this study, the design of mix proportions for the high strength concrete is intended for the practical applications. Lower cement content(450ㆍ500ㆍ550kg/m³at W/C, 550ㆍ600ㆍ650kg/m³at W/C 0.25) than presumed value from specificcation is adopted, and sand aggregate ratio is 38, 43, 48(%). To obtain the same consistency regardless of mix proportion of concrete, superplasticizer is used properly. The results of this study are follows ; the concrete in lower cement content at low water cement ratio has as good consistency and workability as that of higher cement content, increasing the cement content and S/A has an effect on entrapped air, and the most effect method to develop compressive strength is deseasing W/C.
자동낙뢰 관측자료 분석 결과를 이용한 한반도의 낙뢰 분포
소선섭,권하택 공주대학교 방재연구센터 1998 공주대학교 방재연구센터 논문집 Vol.2 No.-
KMA(korea meterological administraion) is observing lightning with automatic lightning observatin equipment since 1991. We used the data produced form automatic lightning observation equipment for one year in 1994. Distribution of lightnng in Korea that used the data analysised and produced from automatic lighting observtion had occur the most in summer especially the western sea and the western island area showed the largest distribution.
연성 방호구조물의 입력변수에 대한 동적 퍼포먼스 민감도 분석
김기동,고만기 공주대학교 방재연구센터 1997 공주대학교 방재연구센터 논문집 Vol.1 No.-
To evaluate the performance of safety appurtenances computer simulation is inevitable in the domestic situation that full scale crash test is not implemented. But, to improve the accuracy of computer simulation, it is important to reasonably determine the input parameters in which the interaction of vehicle-guardrail-soil should be accounted for. This study is focused on how to enhance the reliance of the dynamic performance of guardrail obtained by computer simulation. Analyses were done on the sensitivity of output variables to the change of input parameters by using BARRIER VII of which the usefulness was proved on the barrier-vehicle impact analysis. Through the analyses important input parameters, which give sensitive effects to output of computer simulation, are found out, and methods to determine such parameters are suggested to improve the accuracy of simulation.
이병식 공주대학교 방재연구센터 1997 공주대학교 방재연구센터 논문집 Vol.1 No.-
Stability of cutting slopes surrounding an entrance of highway tunnel is evaluated to ensure safety during tunnel construction as well as performace of the tunnel after construction. Parameters are determined from back analyses of the existing slopes, which are required for the calculation of slope stability. As a result, reinforcement of the slopes are recommended using soil nailing and micro piles to mitigate possibile slope failures. After conducting detailed design for the reinforement, an appropriate number for a unit area and the penetration depth of soil nailing and micro pile are suggested, respectively. Slope stability of the reinforced slopes is, then, evaluated by performing a series of slope stability analyses.
전은정,김준태 공주대학교 방재연구센터 1998 공주대학교 방재연구센터 논문집 Vol.2 No.-
In recent years the benefits of atrium in buildings have been re-recognised in terms of energy saving potentials. In order to maximise energy saving effects in atrium buildings and provide more comfortable environment to their occupants, the indoor climate of atrium spaces should be controlled primarily by passive means rather than costly mechanical systems. This paper aims to vestigate the passive environmental control methods for atrium buildings, which include glazing, sawtooth roof, movable louvre, blind, reflective material and light-shelf. It is argued that the study results are helpful for architects in designing atrium that reduces building energy consumption and enhances the quality of building environment.
임경호 공주대학교 방재연구센터 1997 공주대학교 방재연구센터 논문집 Vol.1 No.-
This study was carried out to evaluate the quantitative characteristics of phenol biodegradation and to establish the effective control techniques using biofilm process. The result from experiments of biofilm process showed that acetate and ammonia as well as fulvic acid took a role as primary substrates to form steady-state biofilm. Biofilm grown on each substrate could use phenol as a secondary substrate so as to kept phenol concentration in effluent at low level. Although the three columns had different potential electron donors for supporting heterotrophic growth, the extent of phenol removal was not significantly different among three columns. Thus, N-column, fed with ammonia, achieved almost as much removal as A- and F-column, which were fed acetate and fulvic acid as a primary substrate, respectively. This result suggested that the primary substrate for the heterotrophic biomass that used the aromatic compounds was comprised of traces of unidentified organic material present in the feed solution and soluble microbial products produced by the nitrifiers.
이병식,이원구,김승조 공주대학교 방재연구센터 1998 공주대학교 방재연구센터 논문집 Vol.2 No.-
Efficiency of tunnel excavation using the jumbo drill is evaluated using the field data. To evaluate the efficiency, variations of excavation and overbreak quantities for different drilling patterns are related with rock qualities represented by rock mass rating(RMR). The drilling patterns consist of the number fo drill hole, and the geometry and depth of drill oles. Among effects of these patterns on excavation, the effect of the number of drill hole is mainly considered. On the basis of the observed relationships, it is intended to suggest the most appropriate drilling pattern for various rock qualities resulting the smallest amount of overbreak. In addition to this investigation, the construction time required for a unit advance of excavation is also investigated when the jumbodrill is used. From the result, the standard advance rate and the efficency of the drilling equipment are evaluated, respectively.
B -NSF계 & 빈졸계 고분자로 변성된 인조석의 물성에 관한 기초 연구
조헌영,서정목,박성기 공주대학교 방재연구센터 1998 공주대학교 방재연구센터 논문집 Vol.2 No.-
In the recent years, artificial stone has been used as exterior finishing materials of bullding. Artificial stone is manufactured with mixture of cement, stone powder and light-weight aggregate. In this research, we tried to find a way of inceasing the properties needed for better quality artificial stone. So, we used β-NSF modifier and vinsol modifier to improve the physical properties of artifical stone. Through this research, we found that the optimum dosage of the β-NSF & the vinsol polymer is 0.1 wt% and 0.05wt% of cement.
溫度-LWC 다이아그램에 의존하는 雷雲의 전기밀도 분석과 우리나라 관측망
姜聲蘭,蘇鮮燮 공주대학교 방재연구센터 1997 공주대학교 방재연구센터 논문집 Vol.1 No.-
In the mature stage cell electric charge, it is formed that the small particles charge is the positive the upper portions of the cloud and negative in the middle part of the cloud, and positive in the lower part of the cloud. Generally, lighting formed in collision with positive charge and negative charge. And, lighting have occur the most in summer and the western sea of the Korean's. In this dissertation, the matrure stage cell electric charge was explained dependence on liquid water content (LWC) - temperature(T), and ice crystal - super cooled drop collisions.