침투력을 고려한 사면안정의 이론적 해석

최기봉 한국산업안전학회 1996 한국안전학회지 Vol.11 No.4

사면안정 해석에 있어서 기존의 연구는 대부분 침투력의 값을 고려하지 않고 안전율을 계산하여 왔다. 그러나 비정상 침투시 침투력은 안전율에 많은 영향을 미친다. 따라서 본 연구에서는 사면안정해석에 있어서 침투력의 영역이 사면의 안전율에 미치는 영향이 큰 것을 확인하기 위해서 Bishop's Simplified Method를 이용하여 이론적으로 침투력을 고려한 안전율계산 수식을 유도하였다. 사면안정 이론식의 전개방법은 제체에 침윤선이 형성될 경우 침윤선을 기준으로 각 절편을 수중상태와 습윤상태로 구분하고, 이 습윤상태의 절편토체에 작용하는 침투력을 고려하여 사면안정수식을 해석했다. The main purpose of this study was to develop a useful method for analysing slope stability by seepage force. The stability of an embankment impounding a water reservoir is highly depend upon the location of seepage line with the embankment, it is important to illustrate the seepage phenomenon. Of particular interest is the stability following a rapid rise change of resorvoir level. Seepage forces in embankments are easily determined if frictional forces are expressed in relation to hydraulic gradient i. Seepage forces can combine with soil weights to improve stability or worsen it, depending on the direction in which the forces act in relation to the geometric cross section.

The study of the determination on blood suger by spectrophotomer

崔機鳳 성균관대학교 1959 成均 化學 Vol.4 No.-

The various tests for determination of glucose in the blood has been established . On this Report through the spectropho-tometer, both KLein-Weissman end Somogyi methods are applied, and the glucose variation in blood by insulin effect and alimentary hyperglycemio has also been measured on a rabbitat the intervals of each 30 minutes , As color reagent Chromotropic acid is used as of Klein-Weissman's method. This color reaction for determination of glucose is based upon the action of a 15M sulfuricacid solution of-Chrmotropic acid on the glucose to produce aviolet . color. The maximum absorption of this color was found to be 570 mu of wave length , and glucose quentity in the blood of a normal rabbit, was found to be 180-200 mg/dl. The relation between the hypoglycemia aused by administration of insulin and the resultant coma is still reserched. Therefore, I report only on the results up to the present time.

수평하중을 받는 철근콘크리트 고층건물의 설계 상세

최기봉,정란,하기주 한국콘크리트학회 1996 콘크리트학회지 Vol.8 No.6

보수 보강된 구조물의 건전성 평가기술

최기봉,최창식,서수연,윤현도 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 논문집 Vol.9 No.2

R/C조 외측 보-기둥 접합부의 정착설계에 대한 해석적 연구

최기봉 한국전산구조공학회 1992 전산구조공학 Vol.5 No.4

외측 보-기둥 접합부에 정착된 곧은 보 주철근의 인발거동을 예견하기 위한 해석모델이 개발되었다. 이 모델은 외측조인트에 수직방향으로 콘크리트를 구속하기 위하여 횡방향 철근을 배치한 상태의 구속조건(confined condition)하에서 이형철근의 부착특성에 관한 정착철근의 직경, 콘크리트 압축강도, 항복강도, 철근간격 및 주압력(column pressure)에 대한 영향을 고려할 수 있는 국부부착에 관한 시뮬레이션을 구체화하였다. 이 연구에서 채택된 해석 기법은 횡방향 철근이 배근된 공시체에 매입한 곧은 이형철근에 대한 인발실험의 결과를 만족하게 예견하였다. ACI-ASCE 352 위원회가 제안하고 있는 외측조인트 상태에서의 정착 철근길이에 관한 규정이 개발된 해석접근법을 사용해 평가 되었다. 이 해석 평가의 결과는 현재의 외측조인트의 구속조건에서의 정착길이에 대한 규정이 너무 안정적인 측면에 있다는 것을 암시하고 있다. An analytical model was developed for predicting the pullout behavior of straight beam longitudinal bars anchored at exterior beam-column connections. The model incorporates a local bond constitutive simulation capable of considering the effects of anchored bar diameter, yield strength and the spacing, concrete compressive strength, and column pressure on the bond characteristics of deformed bars in confined conditions of exterior joints. The analytical techniques adopted in this study were shown to satisfactorily predict the results of pullout tests on straight bars embedded in confined concrete specimens. An evaluation of the ACI-ASCE Committee 352 development length requirements in exterior joint conditions was made using the developed analytical approach. The results of this analytical evaluation are indicative of the conservatism of the current development length requirements in the confined conditions of exterior joints.

PC를 이용한 수평다관절형 로보트의 대화식 작업장 설계 ( The Interactive Robot Work-Cell Layout for Scara Type Using PC )

최기봉,국금환 대한전자공학회 1989 대한전자공학회 학술대회 Vol.1989 No.01

PC를 이용한 수평다관절형 로보트의 대화식 작업장 설계 프로그램

최기봉,국금환,Choe, Gi-Bong,Guk, Geum-Hwan 한국기계연구원 1989 기계연구원소보 Vol.19 No.-

This study is to develop interactive program for work-cell layout of SACARA type robot by using PC. To make this program interactively, we made use of the software which has the function of menu, dialog box, and graphic. By using the mouse, we can progress this program quickly and easily. It has 2Y2 dimension and provides that one can layout elements (robot, peripheral device, and etc.), create work path, and calculate cycle time of working robot. By comparing with cycle times of any number of work-cell layout for same work, we can evaluate work-cell layout. Finally, we can select one work-cell layout to be considered optimal one which has the least cycle time.

Small Dam의 斜面安定 解析

최기봉,배우석,안병철 한국안전학회 2004 한국안전학회지 Vol.19 No.2

The paper describes a procedure for the evaluation of the effect of seepage force on stability of slopes. The stability of an embankment impounding a water reservoir is highly depend upon the location of seepage line with the embankment. To evaluate the accurate safety factor of an embankment, it is important to illustrate the seepage phenomenon. Of particular interest is the stability following a rapid change of reservoir level. Seepage forces in embankments are easily determined if frictional forces are expressed in relation to hydraulic gradient I. If a piezometer is inserted into a body of embankment, the level to which free water rises is a measure of the energy at that point.

Experimental Studies on the Classification of Airborne Particles Based on Their Optical Properties

최기봉,고영진,정영수,정유진 대한화학회 2018 Bulletin of the Korean Chemical Society Vol.39 No.3

We evaluated the proposed correlation value for the analysis of airborne particles using light-scattering signals and aerodynamic size determined using a well-known commercial instrument. This method enables the real-time classification of the components of airborne particles. The correlation value can be applied to classify biological and heavy metal components based on their density. This study opens the path to enhance the current bioaerosol and non-bioaerosol detection system and could help in optimizing the fast detection and classification of airborne particle components.

모듈러 공법을 적용한 공공임대주택의 맞춤형 리모델링 설계에 관한 연구

최기봉,이명식 한국문화공간건축학회 2022 한국문화공간건축학회논문집 Vol.- No.78

Currently, public rental housing is biased toward quantitative supply of housing, and many factors that do not takeinto account the situation of tenants are emerging as social problems. The international community aims to achieve carbonneutrality to cope with global warming and climate change, and the need for eco-friendly materials and recycling methods isemerging in the construction field to reduce greenhouse gas emissions. This study proposes customized remodeling of publicrental housing using a modular method that can improve and revitalize the living environment of public rental housing andprovide smooth rental housing. First of all, customized public rental housing is a customized method that partially applies andremodels residential spaces, public spaces, and convenience facilities that reflect the needs of residents, unlike the existingremodeling method that is re-constructed after full demolition. In addition, the modular method is a type of de-site constructionwork, and it is possible to maximize air shortening and reuse the module by pre-manufacturing and transporting unit modulesto the site in a factory. Therefore, the urban housing problem, which is emerging as housing poverty for small households,requires a differentiated public rental housing supply method to cope with social changes such as lack of new housing,COVID-19, enforcement of the Severe Disaster Penalty Act, and carbon reduction through FM. Second, if residentialperformance is improved and expanded by remodeling existing public rental housing, it is possible to improve the settlementenvironment and supply low-cost and high-efficiency rental housing. Third, by using the modular method, it is possible todevelop a house tailored to consumers and compliant with social changes. It is proposed as a method that can quicklyimprove the residential environment and supply housing for public rental housing by constructing customized remodeling thatreflects the aforementioned demand of residents.