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  • Title/Summary/Keyword: k-코어

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Shear Bond Strength of Veneering Ceramic and Zirconia Core according to the Surface Treatments (지르코니아 코어의 표면처리 방법에 따른 도재 축성의 전단결합강도)

  • Sin, Cheon-Ho;Hwang, Seong-Sig;Han, Gyeong-Soon
    • Journal of dental hygiene science
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    • v.13 no.4
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    • pp.487-492
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    • 2013
  • This study aimed to illuminate the correlatives between the surface processing of Zirconia core and the shear bond strength. The specimens were made by precipitating for two minutes in color liquid and drying to produce a colored Zirconia core following the manufacturer's instructions. The specimens were divided into 4 subgroups according to the surface treatment-sandblasted+liner treatment, SLT group; sandblasted treatment, ST group; liner treatment, LT group; non treatment (control), NT group. The specimens were put on the device with regard to ISO/TS 11405, then tested the shear bond strength with 1 mm shearing speed per minute using the Instron multi-purpose tester. The collected data was analysed by one way ANOVA and t-test. After applying the liner and sandblast to the Zirconia core, shear bond strength value were SLT (23.19 MPa), ST (21.17 MPa), LT (20.53 MPa) and NT (16.46 MPa) in the order. There was a significant difference in the surface roughness between NT and ST group (p<0.001), and in the compressive shear bond strength between NT and SLT group (p<0.05). Therefore, sandblasted plus liner treatment on pre-sintered substructure increased the bond strength of veneering ceramic, compared with other surface treatments.

Testing for Overdispersion in a Bivariate Negative Binomial Distribution Using Bootstrap Method (이변량 음이항 모형에서 붓스트랩 방법을 이용한 과대산포에 대한 검정)

  • Jhun, Myoung-Shic;Jung, Byoung-Cheol
    • The Korean Journal of Applied Statistics
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    • v.21 no.2
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    • pp.341-353
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    • 2008
  • The bootstrap method for the score test statistic is proposed in a bivariate negative binomial distribution. The Monte Carlo study shows that the score test for testing overdispersion underestimates the nominal significance level, while the score test for "intrinsic correlation" overestimates the nominal one. To overcome this problem, we propose a bootstrap method for the score test. We find that bootstrap methods keep the significance level close to the nominal significance level for testing the hypothesis. An empirical example is provided to illustrate the results.

Implementation of a 32-Bit RISC Core for Portable Terminals (휴대 단말기용 32 비트 RISC 코어 구현)

  • Jung, Gab-Cheon;Park, Seong-Mo
    • Journal of the Institute of Electronics Engineers of Korea CI
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    • v.38 no.6
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    • pp.82-92
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    • 2001
  • This paper describes implementation of an embedded 32-Bit RISC core for portable communication/information equipment, such as cellular phones, PDA(Personal Digital Assistants), notebook, etc. The RISC core implements the ARM\circledV 4 instruction set, operates with typical 5-stage pipeline. It supports Thumb code to improve the code density, and uses the dynamic power management method of pipeline registers. It was modeled and simulated in RTL level using VHDL, and verified with ARMulator of ADS (Arm Developer Suite) and had average CPI of 1.44. The core is synthesized automatically using the cell library based on 0.6μm CMOS 1-poly 3-metal CMOS technology. It consists of about 41,000 gates and the clock frequency is expected to be above 45 MHz.

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Balancedness of generalized fractional domination games (일반화된 분수 지배게임에 대한 균형성)

  • Kim, Hye-Kyung;Park, Jun-Pyo
    • Journal of the Korean Data and Information Science Society
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    • v.20 no.1
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    • pp.49-55
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    • 2009
  • A cooperative game often arises from domination problem on graphs and the core in a cooperative game could be the optimal solution of a linear programming of a given game. In this paper, we define a {k}-fractional domination game which is a specific type of fractional domination games and find the core of a {k}-fractional domination game. Moreover, we may investigate the balancedness of a {k}-fractional domination game using a concept of a linear programming and duality. We also conjecture the concavity for {k}-fractional dominations game which is important problem to find the elements of the core.

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Structural-Health Evaluation for Core Zones of Fill Dams in Korea using Electrical Resistivity Survey and No Water Boring Method (전기비저항 탐사와 무수보링을 이용한 국내 필 댐 코어존의 건전성 평가)

  • Lee, Sangjong;Lim, Heuidae;Park, Dongsoon
    • Journal of the Korean GEO-environmental Society
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    • v.16 no.8
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    • pp.21-35
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    • 2015
  • Electrical resistivity survey (2D and 3D) were employed for detection of possible weak zone of core zones of three central core earth-rockfill dams in Korea. In the 2D results, the core zones is lower resistivity zone with less than 50400ohmm, and the basement is relatively higher resistivity zone with over 1,000ohmm. In the 3D results, especially, the weak zone with under 100ohmm was detected spatial distribution area in the dam. We also drilled boreholes to collect soil samples of core zones of each dam. Water was not used during boring, because water for rotary wash boring could cause structural damages in earth dams. We found that the soil samples of core zones from all of the boreholes correspond to CL (USCS), but we also found that the fluidized or water-saturated soil samples were found in lower resistivity zones. Therefore, the electrical resistivity survey and drilling method without water are a quick and efficient method for structural-health evaluation which is detection of possible weak zones in earth core rockfill dams.

Exploration of an Optimal Two-Dimensional Multi-Core System for Singular Value Decomposition (특이치 분해를 위한 최적의 2차원 멀티코어 시스템 탐색)

  • Park, Yong-Hun;Kim, Cheol-Hong;Kim, Jong-Myon
    • Journal of the Korea Society of Computer and Information
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    • v.19 no.9
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    • pp.21-31
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    • 2014
  • Singular value decomposition (SVD) has been widely used to identify unique features from a data set in various fields. However, a complex matrix calculation of SVD requires tremendous computation time. This paper improves the performance of a representative one-sided block Jacoby algorithm using a two-dimensional (2D) multi-core system. In addition, this paper explores an optimal multi-core system by varying the number of processing elements in the 2D multi-core system with the same 400MHz clock frequency and TSMC 28nm technology for each matrix-based one-sided block Jacoby algorithm (128×128, 64×64, 32×32, 16×16). Moreover, this paper demonstrates the potential of the 2D multi-core system for the one-sided block Jacoby algorithm by comparing the performance of the multi-core system with a commercial high-performance graphics processing unit (GPU).

Resistivity Monitoring of Saturated Rock Cores at Room Temperature (수포화 암석코어의 상온 전기비저항 모니터링)

  • Lee, Sang Kyu;Lee, Tae Jong;Yi, Myeong-Jong
    • Geophysics and Geophysical Exploration
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    • v.18 no.3
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    • pp.105-114
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    • 2015
  • A long-term resistivity monitoring system has been developed for saturated cores in room temperature and humidity condition. A 3-channel water-pump continuously drops the water onto the top of saturated core sample surrounded by shrinkable tube as well as on the paper filters of the electrodes at both sides of the core sample, by which one can monitor the resistivity changes with maintaining full saturation of the rock core for a week or longer. Monitoring the resistivity changes has been performed with 3 kinds of rock samples including biotite gneiss, andesitic tuff, and shale for 9 days using the system. Consequently, it is proposed two hypothesis that conversion speed of temperature coefficient has close relation to the thermal properties of the rock sample and that the ratio of resistance between dry and saturated conditions for a rock sample can be related to the effective porosity of the sample. The ratio between dry and saturated resistance for the three rock types are 48, 705, and 2, while effective porosity was 3.7%, 3.3%, and 13.0%, respectively.

Study on the Core Loss Improvement of SiFe Plate in Relation with Laser Pulse Width in the Laser Scribing (레이저 스크라이빙에 있어서 레이저의 펄스폭에 따른 규소강판의 코어손실 개선 연구)

  • Ahn, Seung-Joon;Park, Chul-Geun;Ahn, Seong-Joon
    • Journal of the Korean Magnetics Society
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    • v.15 no.6
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    • pp.320-324
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    • 2005
  • The core loss of 3% SiFe is strongly dependent on silicon content, impurities, permeability, and domain structure of the SiFe. Domain refining has been proved to be very good method for reduction of core loss in high permeability grain oriented SiFe, and laser scribing is well-blown as an effective and industrially important method of domain refinement. In this work, magnetic domain refinement has been carried out by using a pulsed Nd : YAG laser, and the core losses have been measured and analyzed to and optimal parameters of the laser treatment. The laser hem was focused with a spot size of 100μm and pulse energy of 10\~35mJ and the lines were scribed with a period of \~5mm. The core loss was improved up to 17% with 30 ns-Nd : YAG laser beam in 3% SiFe.

5G 코어 네트워크 진화 방향

  • Jo, Chang-Gil
    • Information and Communications Magazine
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    • v.33 no.6
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    • pp.27-32
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    • 2016
  • 본고에서는 5G 포럼 네트워크 위원회에서 진행하고 있는 기술백서의 내용을 중심으로 5G 네트워크에 대한 고찰을 통해서 다가올 5G 네트워크에 대한 진화를 예측해 보고자 한다. 5G, 즉 IMT-2020은 홀로그램, 8K UHD와 같은 진화된 비디오 서비스를 안정적으로 사용하기 위하여 기존 대비 20배 증가된 20Gbps의 최고 전송 속도, 기존 대비 10배 향상된 100Mbps 이상의 이용자 체감 전송 속도 제공을 기본 목표로 하고 있다. 이런 5G 네트워크의 요구 사항을 기능, 구조, 운영 관점에서 살펴보고, 코어네트워크에서 필요한 요구 사항과 고려되고 있는 기술에 대한 고찰을 통해 5G에서의 코어 네트워크에 대한 이해를 돕고자 한다.

5m-off-long-distance inductive power transfer system using dipole coils (다이폴형 코일을 사용한 5m 거리의 자기유도 무선전력전송 기술)

  • Park, Changbyung
    • Proceedings of the KIPE Conference
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    • 2012.07a
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    • pp.627-628
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    • 2012
  • 기존 자기공진형태에서 사용되는 루프 형태의 코일 대신에 코어를 사용한 다이폴 형태의 코일을 1차 측과 2차 측에 사용해 코일의 부피를 줄이 면서도 먼 거리까지 자기장을 보낼 수 있는 자기유도방식의 무선 전력 시스템을 구성 하였다. 각 코일에 사용된 코어의 형상은 코어 내부에서 자기장이 균일하게 분포 될 수 있도록 최적화 되었으며 5m 거리에서 209W의 전력을 전달하고, 최대 16%의 효율을 달성 하였다.

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