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.

A Compliant Parallel Mechanism with Flexure-based Joint Chains for Two Translations

최기봉,이재종,김기홍,임형준 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.

A compliant parallel mechanism for two translations is proposed and applied to a XY fine motion stage driven by piezo actuators. Four flexure-based prismatic-prismatic joint chains are arranged in four sides of a target platform to implement the compliant parallel mechanism. Among others, two are passive joint chains for only motion guidance, and the others are active joint chains for motion guidance merging the function of the displacement amplification of a piezo actuator. Due to the active joint chains, the proposed mechanism has more compact structure than the others which have the separated mechanisms of the motion guidance and the displacement amplification. In addition, the compliant mechanism has a monolithic structure not to be assembled. The compliant mechanism is designed, verified to satisfy some design constraints using Finite element Analysis, and then combined with piezo actuators and capacitance sensors. The characteristics and the performance of the piezo-driven compliant parallel mechanism are demonstrated by experiments.

○○아파트 지하주차장의 정밀안전진단

최기봉 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 논문집 Vol.4 No.2

주제 / 암호론 , 신호처리 , 통신망 : Markov model 을 이용한 시스템 신뢰도 산출

최기봉,최재암 이화여자대학교 수리과학연구소 1998 정보통신에서의 수학의 역할 Vol.- No.-

실시간 생물입자 형광감시기 알고리즘

최기봉,이홍규,하연철 한국대기환경학회 2013 한국대기환경학회 학술대회논문집 Vol.2013 No.8

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.

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.

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

연속붕괴가 방지된 초고층 복합빌딩시스템의 예비설계

최기봉,조태준,김성수,이진용 한국구조물진단유지관리공학회 2015 한국구조물진단유지관리공학회 논문집 Vol.19 No.3

In this study, we propose an innovative lateral force distribution building system between tall buildings by utilizing the difference of moment of inertia, resulting the reduction of lateral displacement and the lateral forces in terms of an alternative for the dense human and increased cost of lands in highly integrated city area. A successive collapse prevention means by providing additional bearing plate between connections is proposed. In addition to that, a more economical vibration reduction is expected due to the suggested tuned mass damper on the surface of spacial structure. In the considered verification examples, reduced drifts at the top location of the building systems are validated against static wind pressure loads and static earthquake loads. The suggested hybrid building system will improve the safety and reliability of the new or existing building system in terms of more than 30% reduced drift and vibration through the development of convergence of tall buildings and spatial structures. 본 연구에서는 수평변위와 횡력의 저감을 위해서 빌딩외부의 빌딩간 변형차이와 단면2차 모멘트의 최대화를 이용하여 다수의 빌딩으로구성된 빌딩시스템의 빌딩간 협업제어 방식의 횡력분배 및 변위감소를 제안하였다. 제안된 복합빌딩 시스템의 안전설계를 위한 방안으로케이블 파단시의 연속붕괴방지를 위한 연결부 정착판의 추가배치와 대공간구조 자체의 질량과 강성 및 공간을 활용한 동조질량감쇠장치의설계에 대하여 제안하였다. 도심지 인구집중과 지가상승의 필연적 결과에 대한 해결방안으로 제안된 초고밀도 복합빌딩 시스템의 설계 최적화를 위하여, 3차원 빌딩구조시스템의 2축 대칭조건과 경계조건을 이용하여 2차원 모델을 구성하고 1차부정정구조를 이루는 2차원 모델의 중요설계변수를 검토하였다. 제안된 복합빌딩구조 시스템은 인구밀도와 지가가 상승하는 도심내 최대밀도구역에서 토지이용의 효율성을극대화시키고, 새로운 빌딩 또는 기존빌딩구조의 안전성을 증대할 것으로 기대한다.