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추연규,탁한호,이천효 진주산업대학교 1999 論文集 Vol.38 No.-
This paper proposes a design of engine model to be mounted on a power train of vehicle and a simulation is carried out in a straight road for the engine's Intelligent Cruise Control. The designed engine model of vehicle uses Matlab simulink. The simulation results of the Fuzzy Controller compared with those of the PID Controller.
이동규,한민철,한천구 청주대학교 산업과학연구소 2007 産業科學硏究 Vol.25 No.1
This study investigated recycling possibility of plastic clay waste (PCW), based on the fundamental properties of mortar using PCW as a mineral admixture. The results were summarized as following. For the properties of fresh mortar, slump flow of the cement mortar using PCW exhibited higher value than MK, except for the mortar incorporating SF and H. As the incorporating ratio increases, fluidity was decreased due to the improved viscosity resulted from increased particle contents. Air content also showed decreasing tendency, but this value could be negligible, compared with MK. For the properties of hardened mortar, the compressive strength of mortar using conventional mineral admixture showed similar tendency to existing results. For mortar incorporating 10% of PCW, it showed rather small strength than that of the plain mortar, but was comparable. It was thought that the decrease of the strength was due to the pozzolanic reaction at the age of 28 days. The tendency of flexural and tensile strength was similar to the results of the compressive strength test with the increase of incorporating ratio.
조기강도 발현형 AE감수제를 사용한 콘크리트의 특성에 관한 연구
황인성,김규동,이승훈,한천구 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2
This study discusses the fundamental properties and early strength development of concrete using AE water reducing agent of early-strength type. According to the result, when AE water reducing agent of early-strength type is used, slump and air content loss is smaller than normal AE water reducing agent. While setting time is retarded with an increase of the adding amount of normal AE water reducing agent, it is maintained constantly regardless of the adding amount and faster than normal AE water reducing agent in the case of AE water reducing agent of early-strength type, and bleeding amount is larger than normal AE water reducing agent especially at early age. At curing temperature of 20℃, early compressive strength gains 5MPa, which side form can be removed, before 16 hours in the case of AE water reducing agent of early-strength type, but early compressive strength development is delayed in the case of normal AE water reducing agent. At curing temperature of 10℃, AE water reducing agent of early-strength type is also better than normal AE water reducing agent especially for early compressive strength development.
曺秉樂,吳圭天,李培光 대구보건대학 1987 대구보건대학 論文集 Vol.10 No.-
This study provides the optimum condition for the removal of the dyes, Acid Red, Metanil Yellow and Methyl violet, in aqueous solution with ozone oxidation at semi-batch reactor. 1. The ozone oxidizing reaction of dyes, Acid Red and Metanil yellows acid solution, Methyl violet in alkali solution, obey good first order kinetics. 2. The degradation rate of the dyes are proportional to "ozone dose rate" R and C the concentration of each dye. so that the kinetics equation 7 is encounted. 3. The removal rate constant, k, of Acid Red was 0.042 min.^(-1), and that of Metanil Yellow and Methyl violet was 0.056 min.^(-1), 0.072min.^(-1), respectively.
트리에탄올아민의 혼입률 변화에 따른 콘크리트의 초기 강도발현 특성
황인성,金光華,김규동,이승훈,한천구 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
In this study, the influence of TEA on early strength development of concrete is discussed in order to reduce a construction period in RC structure by early removal of forms. According to the results, as for the properties of fresh concrete, fluidity of concrete shows no difference, and air content increases with an increase of the mixing ratio of TEA. Setting time is shortened upto mixing ratio of 0.025%, but is retarded above the mixing ratio of 0.025%. The time when compressive strength gains 5MPa is fast in about 2 hours in the case of the mixing ratio of 0.05%, but it is retarded above the mixing ratio of 0.05%. The relativity between compressive strength and the rebound value of P-type Schmidt hammer is also favorable at early age, and compressive strength of 5MPa, which the side forms can be removed, is estimated at the rebound value of 23.
시멘트 제조사 및 W/C 변화에 따른 콘크리트의 초기 강도발현 특성
金光華,裵正烈,김규도,이승훈,한천구 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
This study is to investigate the influence of cement manufacturing company and W/C on the properties of fresh concrete, strength of hardened concrete and rebound value of P type Schmidt hammer. According to the result, setting time of concrete is shortened with and increase of W/C, and when cement made in A and B corporation is used in concrete, the final setting time is measured at about 10 hours and 13 hours. Compressive strength increases with elapse of time and decrease of W/C, and concrete using cement made in A corporation shows higher compressive strength and rebound value until 24 hours, but from 3rd day, the contrary tendency is shown. As for the properties of early strength, the strength develop fast with decrease of W/C, and the time when compressive strength of 5MPa is gained and the form can be removed, is about 15, 18, 21 hours and 20, 22, 27 hours at the W/C 40, 45, 50% in concrete using cement made in A and B Co. respectively. The correlativity between compressive strength and the rebound value, which a coefficient of correlation is over 0.97, is very favorable. Therefore this method is effective to estimate the strength of removing the form.
황인성,장덕우,김규동,이승훈,한천구 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2
This study is intended to develop AE water reducing agent for reduction of bleeding and investigate its practical use. According to the results, fluidity and air content increases with an increase of superplasticizer and MC viscosity agent, AE water reducing agent for reduction of bleeding is developed after determining the ratio of superplasticizer and MC viscosity agent as 3:1 to satisfy the same fluidity and air content to conventional concrete and reduce bleeding amount. As the adding ratio of developed AE water reducing agent for reduction of bleeding increases, fluidity also increases, air content satisfies the aimed range, bleeding and sinking amount of concrete are reduced, and compressive strength is almost not different from plain concrete. Therefore, developed AE water reducing agent for reduction of bleeding satisfies the aimed air content in the range of slump 12~21cm, and can also reduce bleeding amount effectively without quality deterioration of compressive strength.
강의 수소취화에 대한 국부영역에서의 수소의 거동(Ⅰ) : 지연파괴의 수소집적에 미치는 응력 및 소성변형의 영향
이영호,이진우,배명일,고준빈,이규천 충남대학교 산업기술연구소 2001 산업기술연구논문집 Vol.16 No.1
Hydrogen embrittlement cause decrease of it's mechanical properties during hydrogen dissolved in steels. Many mechanisms of hydrogen concentration researches have done, but it is not clearly known yet. In this study the effect of plastic deformation and external stress on mechanism of hydrogen concentration by high temperature hydro-genation treatment were investigated. The main results are as follow : 1)For short time fracture process, a defect rate of chemical potential energy is an important factor on hydrogen concentration for delayed fracture of steel processed with high temperature hydrogen. 2)For long time fracture process, the important element is long range diffusion of hydrogen due to the rate of effective hydrogen density and plastic deformation. 3)hydrogen concentration as plastic deformation vary in proportion to slope of plastic deformation. 4)Hydrogen concentration due to the effect of external stress, but this effect is limited in short range. 5)External stress is an acceleration element for delayed fracture of steel.