• Title/Summary/Keyword: table basis

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Effects of Subway Ridership Change by Fare Incentives in Seoul Metropolitan Area (서울시 대중교통체계개편이 수도권 지하철 통행패턴에 미친 영향)

  • Seo Young-Wook;Kim Yeon-Kyu;Kim Chan-Sung
    • Proceedings of the KSR Conference
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    • 2005.05a
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    • pp.1084-1092
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    • 2005
  • Various urban transport policies have an effect on urban transit riderships. This study reports variations of metropolitan subway travel patterns affected by an enormous change in bus routes and transfer discount policy between subway and bus mode conducted by Seoul city in July 1st of 2004. In an effort to see the difference between the before and the after policies, two datasets are prepared. Firstly, on a daily bassis, an origin-destination trip table of May of 2004 is used. Secondly, on a daily bassis, an origin-destination trip table of August-September of 2004 is used as a counter measure. Even if seasonal variation was not considered. there were increasing riderships of about 0.25 million on a daily basis. Subway line 2 and 7 have an important role in changes. The effects or system changes, however. largely varied on location and subway line numbers.

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The Optimum Design for Low Noise Intake System using Robust Design (강건설계를 이용한 흡기계의 저소음화 최적설계)

  • Oh, Jae-Eung;Cha, Kyung-Joon;Chin, Chung-Un;Choe, Ick-Sung;Lee, Jung-Yoon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2000.06a
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    • pp.1654-1660
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    • 2000
  • Recently, the regulations from the government and the concerns of people give rise to the interest in exhaust and intake noise of passenger car as much as other vehicles. In these demands, performance prediction software was developed in the previous study. In this study, Robust design was used for improving the noise reduction capacity of intake system with the performance prediction software. On the basis of the existing design, length and radius of each component that was thought to effect to capacity of intake system was selected. At first factors are arranged by using $L_{18}$ table of orthogonal array and then optimum value can be obtained by $L_{16}$ table of orthogonal array.

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Flash Memory System for Solid-state Disk by Using Various Memory Cells (다양한 메모리 셀을 결합한 디스크형 플래쉬 메모리 시스템)

  • Jung, Bo-Sung;Lee, Jung-Hoon
    • IEMEK Journal of Embedded Systems and Applications
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    • v.4 no.3
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    • pp.134-138
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    • 2009
  • We present a flash memory system with low cost and high performance for solid-state disk. The proposed flash system is constructed as a SLC with hot blocks and a MLC with cold blocks. Either the SLC or the MLC is selectively accessed on the basis of a position bit in a mapping table. Our results show that the system enables the SLC size to be reduced by about 80% relative to a conventional SLC while maintaining similar performance. And also, our system can improve a performance by above 60% comparing with a conventional MLC.

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Automated inventory and material science scoping calculations under fission and fusion conditions

  • Gilbert, Mark R.;Fleming, Michael;Sublet, Jean-Christophe
    • Nuclear Engineering and Technology
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    • v.49 no.6
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    • pp.1346-1353
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    • 2017
  • The FISPACT-II inventory simulation platform is a modern computational tool with advanced and unique capabilities. It is sufficiently flexible and efficient to make it an ideal basis around which to perform extensive simulation studies to scope a variety of responses of many materials (elements) to several different neutron irradiation scenarios. This paper briefly presents the typical outputs from these scoping studies, which have been used to compile a suite of nuclear physics materials handbooks, providing a useful and vital resource for material selection and design studies. Several different global responses are extracted from these reports, allowing for comparisons between materials and between different irradiation conditions. A new graphical output format has been developed for the FISPACT-II platform to display these "global summaries"; results for different elements are shown in a periodic table layout, allowing side-by-side comparisons. Several examples of such plots are presented and discussed.

Shaking Table Test Study on 3-Dimensional Floor Isolation of Main Control Room of Nuclear Power Plant (원전 주제어실 3차원 층면진시스템의 진동대 실험 연구)

  • Lee, Kyung-Jin;Ham, Kyung-Won;Suh, Yong-Pyo;Yoon, Hyun-Do
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2006.03a
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    • pp.409-416
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    • 2006
  • The seismic characteristics with 3-Dimensional Floor Isolation System have been studied using a shaking table system. In this study, we made two kind of floor system (Type I, Type II) and several seismic tests with and without isolation system were conducted to evaluate 3-Dimensional Floor Isolation Effectiveness. Both type have showed large reduction effectiveness in acceleration, response spectra but Type II have showed lower acceleration and lower first mode in response spectra, compared to type I. On the basis of test results and consideration of application, it is found that type II is more suitable for floor model of main control room of Nuclear Power Plant.

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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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Ground State Computation of Interacting Fermion Systems by using Advanced Stochastic Diagonalization (진보된 혼돈 대각화 방법을 이용한 상호작용하는 페르미온 계의 기저상태 계산)

  • Ahn, Sul-Ah;Cho, Myoung Won
    • Proceedings of the Korea Contents Association Conference
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    • 2007.11a
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    • pp.209-211
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    • 2007
  • The computational time of Stocahstic Diagonalization (SD) calculation for 2-dimensional interacting fermion systems is reduced by using several methods including symmetry operations. First, each lattice is subdivided into spin-up and spin-down lattices separately, thus allowing a bi-partite lattice. A valid basis state is then obtained from stacking up an up-spin configuration on top of a down-spin configuration. As a consequence, the memory space to be used in saving the trial basis state reduces significantly. Secondly, the matrix elements of a Hamiltonianin are reconrded in a look-up table when making basis state set. Thus the repeated calculation of the matrix elements of the Hamiltonian are avoided during SD process. Thirdly, by applying symmetry operations to the basis state set the original basis state is transformed to a new basis state whose elements are the eigenvectors of the symmetry operations. The ground state wavefunction is constructed from the elements of symmetric - bonding state - basis state set. As a result, the total number of basis states involved in SD calculation is reduced upto 50 percentage by using symmetry operations.

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A Study on the Material of Furniture in Goryeo (고려시대 가구재료 연구)

  • Cho, Sook-Kyung
    • Journal of the Korea Furniture Society
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    • v.25 no.1
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    • pp.19-27
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    • 2014
  • This paper studied the materials of the furniture which the noble men used in Goryeo, based on the furniture material category of solid wood furniture, lacquerware inlaid with mother-of-pearl and hardware. As for the solid wood furniture, the wood and furniture types are inferred based on the documents. The trees used for the wood furniture were zelkova, korean willow, pine, royal paulownia, maidenhair tree, korean pine, chinese juniper and elm. The furniture types were table, chair, wooden bench, small portable table, writing table, and folding screen. As to the types of lacquerware inlaid with mother-of-pearl, most of them were hams with top, which were made of abalone shells. The features of the lacquerware inlaid with mother-of-pearl were in detail and elaborate like the pattern of the full bloomed chrysanthemum. Writing tables were also made of lacquerware as pieces of furniture. Distinctively, the mother-of-pearl furniture material was popular enough to be used even in a horse saddle. Regarding the metal feldspar used as both a practical use and decoration, there are drop handle, hinge, the front basis, and lock seen in the artifacts, which were made of cast iron, bronze, and brass. Their manufacture techniques were eojamoon, bratticing and sheet metal. Through this study of the furniture materials used in Goryeo, it seems that Goryeo furniture focused on the functions rather than on the decorations, and in turn the forms were simple and basic. The technique of mother-of-pearl, a bit elaborate one, was used in the props furniture like kitchen wares, hams, or writing talbes. Probably, the solid wood is inferred to be used in a low wooden bench, a chair, and a table based on the documents.

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Simulation for application of pumping-and-treatment system to the recovery of non-aqueous phase liquids (NAPLs) at and below the water table (토양의 포화지대에 분포하는 고밀도비수상액체(DNAPL)와 저밀도비수상액체(LNAPL)의 펌핑 제거공정에 대한 모사)

  • 김주형;이종협
    • Journal of Korea Soil Environment Society
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    • v.2 no.1
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    • pp.51-61
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    • 1997
  • The objective of this study is to evaluate the feasibility of Pumping-and-Treatment system (PTS) for remediation of the saturated zones contaminated with NAPLs. A simulation is carried out for the removal of DNAPLs (denser-than-water non-aqueous phase liquids) and LNAPLS (lighter-than-water non-aqueous phase liquids) distributing at and below the water table. In the study, LNAPL and DNAPL are assumed to be n-hexane and 1,1-dichloroacetone, respectively. The model system studied consists of four heterogeneous soil layers with different permeabilities. Groundwater flows through the bottom layer and a pumping well is located under the initial water table. The time-driven deformation of the water table and removal efficiency of contaminants are estimated after vacuum application to the inlet of the well. In the calculation, FVM (Finite Volumetric Method) with SIMPLEC algorithm is applied. Results show that removal efficiencies of both DNAPL and LNAPL are negligible for the first 5 days after the PTS operation. However, when the cone-shape water table is formed around the inlet of the pumping well, the rapid removal rate is obtained since NAPLs migrate rapidly through the curvature of the water table. The removal efficiency of DNAPL is estimated to be higher than that of LNAPL due to the gravity. The results also show that the fluctuation or cone-shaped depression of the water table enhances the removal efficiency of NAPLs in saturated zones. The simulation results could provide a basis of the PTS design for the removal of NAPLs in saturated zones.

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Linear algebra algorithm for the optimal solution in the Blackout game (바둑판을 이용한 흑백 게임의 최적해를 구하는 선형대수학 알고리즘)

  • 이상구;박종빈;양정모;김익표
    • The Mathematical Education
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    • v.43 no.1
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    • pp.87-96
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    • 2004
  • For finding the optimal strategy in Blackout game which was introduced in the homepage of popular mono "Beautiful mind", we develope a mathematical proof and an algorithm with a software. We only use the concept of basis and knowledge of basic linear algebra. This process can be extended to the fullsize Go table problem and shows why we have to study mathematics at the college level.

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