• 한국지진공학회:학술대회논문집
• /
• 한국지진공학회 2006년도 학술발표회 논문집
• /
• pp.545-552
• /
• 2006

Small-scale models have been frequently used for seismic performance tests because of limited testing facilities and economic reasons. However, there are not also enough studies on similitude law for analogizing prototype structures accurately with small-scale models, although conventional similitude law based on geometry similitude is not well consistent in their inelastic seismic behaviors. When fabricating prototype and small-scale model of reinforced concrete structures by using the same material, added mass is demanded from a volumetric change and scale factor could be limited due to aggregate size. Therefore, it is desirable to use different materials for small-scale model. In our recent study, a modified similitude law was derived depending on geometric scale factor, equivalent modulus ratio and ultimate strain ratio. And quasi-static and pseudo-dynamic tests on the specimens are carried out using constant and variable modulus ratios, and correlation between prototype and small-scale model is investigated based on their test results. In this study, tests on scaled model of different concrete compressive strength aye carried out. In shaking table tests, added mass can not be varied. Thus, constant added mass on expected maximum displacement was applied and the validity was verified in shaking table tests. And shaking table tests on non-artificial mass model is carried out to settle a limitation of acceleration and the validity was verified in shanking table tests.

• 산업기술연구
• /
• 제24권B호
• /
• pp.47-57
• /
• 2004

This study is aiming to obtain the pabulum of architectural planning about out-patient clinic department in armed force hospital with search. The discussion was about characteristic problems and differentiated planning characteristics of common general hospital, So the conclusion of research is as follows. In army medical facilities, Because of architectural standard of out-patient clinic department about scale of facilities and characteristic in each examination-part is unprepared, it may have to be readied. Out-patient clinic department was become plan to scale about whole 7~8% in hospital to SB hospital in 95 but was planed about 5% of whole scale from PS hospital in 97. When plan hospital, increase of equipment and increase of module size about bed for the convenience of patient or employees are judged for cause in hospital since 97 years than previous hospital in 95.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 1993년도 가을 학술발표회 논문집
• /
• pp.29-32
• /
• 1993

Presengly reinforced earth is widely utilized for earth structure increasingly not only domestic but also in many foreign countries because of its rapidity of construction and economic merits. The study on the reinforced earth has been actively carried out and enlarged in the theoretical aspect. But it has many problems to the application of the field. In this study large scale Pull-out Test was used to analyze reinforced earthe behavior considering deformation character of reinforced earth under the similar condition to the field.

• 스마트미디어저널
• /
• 제6권3호
• /
• pp.75-82
• /
• 2017

최근 세계적으로 바다가 자원의 보고로 주목 받으면서 해양관련 기술에 대한 연구가 활발히 진행 되고 있다. 특히 해양환경을 분석하고 이해하기 위해서는 지속적으로 해양환경 자료를 수집해야 하나 국내 해양환경 모니터링에 대한 연구는 미흡하다. 본 논문은 오픈소스 기반의 해양환경 감시 시스템을 제안한다. 제안 시스템은 하둡(Hadoop)기반의 시계열 데이터베이스를 이용하여 스케일 아웃(Scale out) 시스템으로 설계하여 수집되는 데이터가 늘어나더라도 컴퓨터 자원을 늘려서 쉽게 처리할 수 있다. 또한 수집되는 데이터를 시각화함으로써 해양 자료를 분석하는데 이용할 수 있다.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2004년도 추계학술대회
• /
• pp.1592-1597
• /
• 2004

Experimental studies were carried out to confirm the turbulent enhancement of the cooling system of nuclear reactor by large scale vortex generation in nuclear fuel rod bundle. The large scale vortex motions were generated by rearranging the inclination angles of mixing vanes to the coordinate directions. Experimental studies were carried out at Reynolds Number 60,000 with hydraulic condition. Normal variations of mean velocity and turbulent intensity in the rod bundle subchannel were measured by the 2-color LDV measurement system. The turbulence generated by split mixing vanes has small length scales so that they maintain only about 10DH after the spacer grid. On the other hand, the turbulences generated by the large scale vortex continue more and remain up $25D_{H}$ after the spacer grid.

• Steel and Composite Structures
• /
• 제8권5호
• /
• pp.361-388
• /
• 2008

The Eurocode 4 presents some negative aspects in the design of composite slabs by the m-k Method or the Partial Connection Method. On one hand, the component chemical adherence is not accounted for in the connection between the profiled steel sheet and the concrete. On the other hand, the application of these methods requires some fitting parameters that must be determined by full scale tests. In this paper, the Eurocode 4 methods are compared with a method developed at the Federal Polytechnic School of Lausanne, based on pullout tests, which can be a valid alternative. Hence, in order to calculate the necessary parameters for the three methods, several tests have been performed such as the full scale test described in Eurocode 4 and pull-out tests. This last type of tests is of small dimensions and implicates lower costs. Finally, a full-scale test of a steel-concrete composite slab with a generic loading is presented, with the goal of verifying the analytical formulation.

• 한국콘텐츠학회논문지
• /
• 제18권2호
• /
• pp.248-261
• /
• 2018

본 연구에서는 Przybylski 등(2013)이 개발한 소외에 대한 두려움 척도(Fear of Missing Out Scale, FoMO Scale)를 국내 문화에 적합하게 번안하여 타당화 작업을 진행하였다. 탐색적 요인분석과 문항내용 분석을 통해 3요인으로 구성하였으며, 확인적 요인 분석에서는 세 가지 모형을 구성하여 모델의 적합도를 비교 검증하였다. 분석 결과, 총 3요인 모형, 8개 문항의 구조가 가장 적합한 것으로 나타났다. 한국 문화의 특성적 맥락과 이론적 근거를 통해 추출한 하위요인은 '소속 욕구', '외적 동기', '상대적 박탈감'이다. 본 척도와 각 하위 요인별 신뢰도 수준은 양호하였다. FoMO는 삶의 만족도와 긍정정서 및 부정정서, SNS 중독 경향성과 유의한 상관을 보여 공존타당도를 충족하였다. 감사성향과는 낮은 상관을 보여 변별타당도를 충족시켰다. 마지막으로, 연구의 제한점과 향후 연구를 위한 제안을 하였다.

• 한국기계연구소 소보
• /
• 통권9호
• /
• pp.183-191
• /
• 1982

This report describes the analysis method of the full-scale propulsive performance by using the data of model test and the full-scale speed trial. The model test data were analyzed by the computer program "PPTT" based on "1978 ITTC Performance Prediction Method for Single Screw Ships." Also the full-scale speed trial data were analyzed by the computer program "SSTT" based on the newly proposed “SRS-KIMM Standard Method of Speed Trial Analysis." An analysis of model and full-scale test data was carried out for a 60.000 DWT Bulk Carrier and the correlation between model and full-scale ship was stuied.

• Tribology and Lubricants
• /
• 제23권1호
• /
• pp.9-13
• /
• 2007

Despite numerous researches on atomic-scale friction have been carried out for understanding the origin of friction, lots of questions about sliding friction still remain. It is known that friction at atomic-scale always shows unique phenomena called 'stick-slips' which reflect atomic lattice of a scanned surface. In this work, experimental study on the effects of system stiffnesses and load on the atomic-scale stick-slip friction of graphite was performed by using an Atomic Force Microscope and various cantilevers/tips. The objective of this research is to figure out the dependency of atomic-scale friction on the nanomechanical properties in sliding contact such as load, stiffness and contact materials systematically. From this work, the experimental observation of transitions in atomic-scale friction from smooth sliding to multiple stick-slips in air was first made, according to the lateral cantilever stiffness and applied normal load. The superlubricity of graphite could be verified from friction vs. load experiments. Based on the results, the relationship between the stickslip behaviors and contact stiffness was carefully discussed in this work. The results or this work indicate that the atomic-scale stick-slip behaviors can be controlled by adjusting the system stiffnesses and contact materials.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2007년도 춘계학술대회B
• /
• pp.3128-3133
• /
• 2007

The mixing method of water and chemicals is significant in a small-scale water supply system because drinking water should be supplied with a certain quantity of remaining chemicals maintained. In the present study, the concentration distribution and the mixing index were obtained from four models, which were to find out the optimal mixing method of water and chemicals. The two models brought the good mixing effects out of the four, one for providing chemicals from the center of water supply pipe and the other for setting up the semicircle block at the downstream of the chemicals-providing pipe. As a result, the mixing effect was found out to be increased due to the diffusion and the disturbance of flows. In conclusion, these results are expected to contribute to designing the optimal mixing system.