• Title/Summary/Keyword: RI Test

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Disturbed State Modeling for Dynamic Analysis of Soil-Structure Interface (흙-구조물 경계면의 동역학적해석을 위한 교란상태 모델링)

  • Park, Inn-Joon;Yoo, Ji-Hyeung;Kim, Soo-Il
    • Journal of the Korean Geotechnical Society
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    • v.16 no.3
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    • pp.5-13
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    • 2000
  • In this study, the Disturbed State Concept (DSC) constitutive model is calibrated and modified for steel-sand interface by using the HiS S model for relative intact (Rl) state and the critical state model for the fuBy adjusted (FA) part in the material. The general formulation for implementation is developed. Then, the DSC model with modification for interface is implemented in finite element program based on the generalized Biot's theory. The interface test under one-way monotonic and two-way cyclic loading were numerically simulated using the finite element program modified in this study. The DSC predictions show improved agreement with the observed results from laboratory test. Overall, the computer procedure with the DSC allows relatively improved simulation ofthe soil-structure interaction problems.oblems.

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Epidemiological Survey on Clonorchis sinensis in Yeoju Gun Gyeong-gi Do (경기도(京畿道) 여주군(驪州郡)에 있어서의 간흡충감염실태조사(肝吸虫感染實態調査))

  • Joo, Kyoung-Hwan;Choi, Deuk-Lin;Rin, Han-Jong
    • Journal of agricultural medicine and community health
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    • v.7 no.1
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    • pp.43-49
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    • 1982
  • Clonorchiasis sinensis is one of the most important endemic diseases in Korea, and this disease has been known to be one of public health concern in many areas of Korea. This survey was undertaken to evaluate the status of clonorchiasis in Yeoju Gun, Gyeong-gi Do from July to September 1980. A total of 1,194 male students were examined by intradermal test with Clonorchis antigen. In order to detect Clonorchis egg, the stool examinations were undertaken to 1,158 students, and the intensity of the Clonorchis infection was estimated by the Stoll's egg count. The prevalence rate was reanalyzed by the regional groups for an investigation of regional characteristics of infection. The following results were obtained in this survey. 1) Among 1,194 students in Yeoju Eup, positive rate of intradermal test with C. sinensis antigen was 17.2 percent. (middle school14.6% and high school 20.1%). 2) In the examination of 1,158 stool specimens, Clonorchis eggs were found in 97 (8.4%) cases. 3) Mean E.P.G. of Clonorchis infected case was $1,330{\pm}2,620$. 4) The degree of the intensity of Clonorchis infection by E.P.G. count was distributed as 73.6% in light infection (100-999), 22.6%, in moderate infection (1,000-9,999), and 3.8% in heavy infection (10,000-29,999). 5) High prevalence rate of Clonorchis sinensis was found in the Sang-Ri(9,3%) and Ha-Ri(8.4%) in Yeoju Eup. Neighbouring Bugnae Myun (11.5%), Gangcheon Myun(12.1%) and Neungseo Myun (11.1%) adjacent to the river had a similary high prevalence of C. sinensis.

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The necessity of Introducing the In-service Test based on Analysis of Performance Test Result of Pressure Safety Valve (안전밸브 성능점검 자료 분석을 통한 운전 중 점검방법 도입의 필요성 고찰)

  • Jang, Yu Ri;Kim, Jeong Hwan;Kim, Seong Hee;Kwak, Young Hwan
    • Journal of the Korean Institute of Gas
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    • v.21 no.6
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    • pp.15-22
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    • 2017
  • The pressure safety valve is very important device for securing the safety in the facilities which is operated by high pressure gases. The performance test should be periodically inspected by relate law because the failure of pressure safety valves might be main causes of serious accidents in the industrial fields. Shop test is mainly use for inspecting the performance test of pressure safety valves but the test method is not to be a solution for securing the safety. So, the development of alternative method is required. In this paper, there is a limit to securing the safety if the performance test is with just shop test. The limitation is checked from analysis result based on performance test results of pressure safety valves. The necessity for introducing the in-service test is reviewed to surmount the limitation. As a result, in-service test method should be developed and introduced to improve the inspection efficiency and economical loss. Also, it can be reduce the risk level.

Detection of Groundwater Table Changes in Alluvium Using Electrical Resistivity Monitoring Method (전기비저항 모니터링 방법을 이용한 충적층 지하수위 변동 감지)

  • 김형수
    • The Journal of Engineering Geology
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    • v.7 no.2
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    • pp.139-149
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    • 1997
  • Electrical resistivity monitoring methods were adopted to detect groundwater table change in alluvium. Numerical modelling test using finite element method(FEM) and field resisfivity monitoring were conducted in the study. The field monitoring data were acquired in the alluvium deposit site in Jeong-Dong Ri, Geum River where pumping test had been conducted continuously for 20 days to make artificial changes of groundwater table. The unit distance of the electrode array was 4m and 21 fixed electrodes were applied in numerical calculation and field data acquisition. "Modified Wenner" and dipole-dipole array configurations were used in the study. The models used in two-dimensional numerical test were designed on the basis of the simplifving geological model of the alluvium in Jeong Dong Ri, Geum River. Numerical test results show that the apparent resistivity pseudosections were changed in the vicinity of the pootion where groundwater table was changed. Furthermore, there are some apparent resistivity changes in the boundary between aquifer and crystalline basement rock which overlays the aquifer. The field monitoring data also give similar results which were observed in numerical tests. From the numerical test using FEM and field resistivity monitoring observations in alluvium site of Geum River, the electrical monitoring method is proved to be a useful tool for detecting groundwater behavior including groundwater table change. There are some limitations, however, in the application of the resistivity method only because the change of groundwater table does not give enough variations in the apparent resistivity pseudosections to estimate the amount of groundwater table change. For the improved detection of groundwater table changes, it is desirable to combine the resistivity method with other geophysical methods that reveal the underground image such as high-resolution seismic and/or ground penetrating radar surveys.

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Characteristics of Fatigue Crack Initiation and Fatigue Strength of Nitrided 1 Cr- 1Mo-0.25V Turbine Rotor Steels

  • Suh, Chang-Min;Hwang, Byung-Won;Murakami, Ri-Ichi
    • Journal of Mechanical Science and Technology
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    • v.16 no.8
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    • pp.1109-1116
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    • 2002
  • To investigate the effect of nitriding layer on both fatigue crack initiation and fatigue life, turbine rotor steel ( IC.- 1Mo-0.25V steel) specimens were nitrided by the nitemper method and then put to a rotary bending fatigue test at room and elevated temperatures. In nitriding, temperature and time were controlled to obtain a different nitrided thickness. Microstructure analysis, micro-Victors hardness test, and scanning electron microscope observation were carried out for evaluating experiments. In results, the fatigue cracks of nitrided specimens were initiated at inclusion near the interface between nitrided layer and substrate, which showed fish-eye type appearance in fractograph. The fatigue life of nitrided specimens at every temperature was prolonged compared to that of the non-nitrided. However, there was not observable improvement in fatigue characteristics with the increase of a nitrided thickness.

Construction of Marine Small Hydro Power Plant using Discharge Water of Fish Farm (양어장 방류수를 이용한 해양소수력발전소 구축에 관한 연구)

  • Hwang, Yeong-Cheol;Choi, Young-Do
    • The KSFM Journal of Fluid Machinery
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    • v.16 no.5
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    • pp.11-17
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    • 2013
  • This study is aimed to construct a marine small hydro power plant using discharge water of fish farm in Jeju Haengwon-ri. The difference of design methods between marine small hydro power plant and land small hydro power plant is to consider the tides. Moreover, ground condition should be examined because gushout sea water comes out from the ground at high tide in Jeju as the ground of Jeju beach consists of basalt stone. From the field test of the turbine generator after construction of the power plant, output power and efficiency of the turbine generator shows good conformance to the required conditions.

LABORATORY TEST OF CCD #1 IN BOAO (보현산 천문대 1번 CCD카메라의 실험실 테스트)

  • Park, Byeong-Gon;Cheon, Mu-Yeong;Kim, Seung-Ri
    • Publications of The Korean Astronomical Society
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    • v.10 no.1
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    • pp.67-78
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    • 1995
  • An introduction to the first CCD camera system in Bohyunsan Optica1 Astronomy Observatory(CCD#l) is presented. The CCD camera adopts modular dewar design of IfA(Institute for Astronomy at Hawaii University) and SDSU(San Diego State University) general purpose CCD controller. The user interface is based on IfA design of easy-to-use QUI program running on the NeXT workstation. The characteristics of the CCD#l including Gain, Charge Transfer Efficiency, rms Read-Out Noise, Linearity and Dynamic range is tested and discussed. The CCD#l shows 6.4 electrons RON and gain of 3.49 electrons per ADU, and the optimization resulted in about 27 seconds readout time guaranteeing charge transfer efficiency of 0.99999 for both direction. Linearity test shows that non-linear coefficient is $6{\times}10^{-7}$ in the range of 0 to 30,000 ADU.

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Quality Characteristics of Snack with Added Dongchimi Powder (동치미 분말을 이용한 스낵의 품질 특성)

  • Choi, Jin Joo;Park, Yoo Ri;Chung, Chang-Ho
    • Journal of the East Asian Society of Dietary Life
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    • v.24 no.6
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    • pp.819-826
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    • 2014
  • Consumer's demand for higher dietary fiber and lower fat in processed foods are increasing. This study developed a low fat and high dietary fiber snack using egg whites and dry fermented radish powder obtained from Dongchimi fermentation. Quality characteristics, such as hardness, color, fat content and total dietary fiber, of the developed snack were conducted along with a hedonic test. As the amount of the fermented powder increased in the formulation, water content and snack hardness decreased. Up to 14.5% radish powder was added (or 9.54% dietary fiber; dry weight, w/w) to the formulation, and hedonic test found snack containing 4.8% (w/w) powder showed the highest scores for overall acceptability.

Technology Innovation, Human Capital and R&D Effects on Economic Growth

  • Lim, Woo-Ri;Yi, Chae-Deug
    • International Area Studies Review
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    • v.21 no.1
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    • pp.201-219
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    • 2017
  • This paper analyzes the economic effects of the S&T Innovation, R&D, human resources and investment on the economic growth using 18 countries. We have obtained the somewhat mixed results on the existence of unit root roots in variables. While most of Pedroni cointegration tests show that there are no panel cointegration among the variables, Kao cointegration test shows that there is the panel cointegration among the variables such as GDP, human capital, R&D investment and patent. Kao cointegration test result shows that human capital, R&D investment, patent economic growth seem to have the panel cointegration or the long-run relationship among them as a whole. The estimation results of individual OLS and panel estimation show that the human capital, R&D investment and technology innovation or patent had positively significant effects on economic growth or GDP.

Physical·Mechanical and Temperature Properties of Fiber Reinforced Porous Green Roof Hwang-toh Concrete (섬유보강 다공성 옥상녹화 황토콘크리트의 물리·역학적 및 온도변화 특성 평가)

  • Oh, Ri On;Kim, Chun Soo;Kim, Hwang Hee;Jeon, Ji Hong;Kwon, Wan Sig;Park, Chan Gi
    • Journal of The Korean Society of Agricultural Engineers
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    • v.55 no.4
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    • pp.65-72
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    • 2013
  • The physical, mechanical, water purification and temperature properties of fiber reinforced porous hwang-toh green roof concrete have been evaluated in this study. The effect of the depending on replacement ratio of blast furnace slag to cement was investigated such that the replacement ratio is varied to 0 % and 30 %. Also, the replacement ratios of hwang-toh were 0, 20 and 30 %. The polyvinyl alcohol fiber was used for the reinforcing fiber. A series of pH test, unit weight, void ratio, compressive strength, after purification and variation of temperature test have been performed to evaluate the performance, water purification effect and temperature properties of the fiber reinforced porous hwang-toh green roof concrete. The test results indicate that the physical and mechanical properties of fiber reinforced porous hwang-toh green roof concrete is affected by the replacement ratio of the blast furnace slag and hwang-toh contents. Results of purifying water showed that the water purification effect of porous hwang-toh green roof concrete is about 40 %. Also, the temperature properties test results indicate the green roof blocks using fiber reinforced porous hwang-toh green roof concrete have insulation and temperature reduction effect.