• 제목/요약/키워드: Rate-capability

검색결과 1,196건 처리시간 0.028초

불량률과 이치하는 공정능력 지수 $C_{pd}$ (A Process Capability Index $C_{pd}$ Consistent with the Proportion of Nonconforming Items)

  • 임태진;변시섭
    • 품질경영학회지
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    • 제28권2호
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    • pp.103-122
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    • 2000
  • Process capability indices (PCI) $C_p\;C_{pk},\;C_m,\;and\;C_{pmk}$ are widely used to evaluate the process performance. The PCI's have been evolved to consider the 'off targetness' more adequately. However, all of these indices are found to be inconsistent with the proportion of nonconforming items, in some cases. That is, the PCI for a process may result in higher value even when the proportion of defectives increases. For these reasons, we propose a new capability index, $c_{pd}$, which is consistent with the defect rate. The characteristics of the new PCI, $c_{pd}$ are investigated with respect to the existing PCI's. Some statistical properties of an estimator for $c_{pd}$ are also investigated by a Monte Carlo simulation. Sensitivity study under minor deviation from normality is also performed to show the robustness of $c_{pd}$. A good estimator for $c_{pd}$ is under study.

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오디오 취득 기반의 방범용 시스템을 위한 환경 잡음과 비명소리 분석 (Analysis on Scream and Ambient Noise for Security System with Audio Capability)

  • 박주현;서지훈;이석필
    • 전기학회논문지
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    • 제63권6호
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    • pp.804-809
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    • 2014
  • Recently, the prevention of crime using CCTV draws special in accordance with the higher crime incidence rate. Therefore security systems like a CCTV with audio capability are developing for giving an instant alarm. This paper proposes an analysis on screams and ambient noises for security systems with audio capability. This analysis result will be helpful for security systems to detect screams well with various ambient noises in real environment.

송전계통에서의 공급능력여유의 평가에 관한 연구 (A Study for Load Supplying Margin of Transmission Networks)

  • 송길영;남궁재용;최재석;김용하
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1995년도 하계학술대회 논문집 B
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    • pp.513-515
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    • 1995
  • Based on the concept of Load Supplying Capability of a transmission network, we provides an information concerning network adequacy. In particular this paper describes an algorithm regarding load supplying margin of transmission networks. And a different growth rate is assigned to each load point so that various demand characteristics can be taken into consideration at respective locations. In addition to this, in this paper, both generation and transmission equipment will be considered in determining the system capability. A 10 bus model system is used to demonstrate the capability of the proposed algorithm.

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Development of a 170kV 50kA Capacitorless Gas Circuit Breaker

  • Park, K. Y.;K. D. Song;Y. H. Oh;W. P. Song;J. H. Kang;Park, S. W.
    • KIEE International Transactions on Electrophysics and Applications
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    • 제3C권3호
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    • pp.73-76
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    • 2003
  • In modern EHV (Extra High Voltage) class GCBs (Gas Circuit Breakers), the interruption capability for SLF (Short Line Fault) is one of the most important aspects of performance required for GCBs. Up to now, the SLF interruption capability of EHV class GCBs was partially assisted by the adoption of capacitors able to decrease the dV/dt of the TRV (Transient Recovery Voltage), particularly the TRV on the line side. This paper describes the technique to increase the SLF interruption capability of EHV class GCBs as well as the procedure to develop capacitorless l70kV 50kA GCB.

국적선사와 외국적선사의 물류서비스 속성과 역량에 관한 비교 연구 (A Comparison Study between Korean and Foreign Shipping Lines on Logistics Service Attributes and Capability)

  • 이상윤;고현정
    • 한국항만경제학회:학술대회논문집
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    • 한국항만경제학회 2006년도 국제학술대회
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    • pp.291-309
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    • 2006
  • In order to obtain and maintain competitive advantage, under rapidly changing maritime environment, liners should make efforts to reinforce their logistics service capabilities. Most of all, for this, shipping lines should accurately recognize and evaluate their logistics service attributes. In the present research, various logistics service attributes for ocean carriers were selected from previous studies and the observed data for 6 main service attributes were collected through a questionnaire survey to 31 maritime experts. Moreover, shipping lines' relative logistics service capabilities were measured by an additional survey process. The comparative gravity between core evaluation factors were measured by AHP technique and the relative capability levels of 2 Korean liners and 5 foreign shipping companies were assessed by utilizing a fuzzy model. The empirical result presents that Korean liners are superior at customer service capability but inferior at freight rate competitiveness. This research shows that Korean liners are ranked at high position for overall logistics service capabilities and focusing on the differentiation strategy but not on the cost related strategy.

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균일변형시 비정질 합금의 에너지 흡수력 평가 (Energy Absorption Capability of Amorphous Alloys During Homogeneous Deformation)

  • 박경원;이창면;이홍기;이재훈;이재철
    • 대한금속재료학회지
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    • 제46권9호
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    • pp.572-576
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    • 2008
  • Elastostatic compression tests were carried out on amorphous alloys to evaluate their energy absorption capability during homogeneous deformation at room temperature. Experiments demonstrated that a compressive stress below the global yield imposed on amorphous alloys for extended periods causes homogeneous plastic strain associated with the irreversible structural disordering. During the disordering process, free volume was created, dissipating the externally applied strain energy and the rate of creation was found to converge to a saturated value. We evaluated the capability of energy absorption of amorphous alloys during homogeneous deformation using recent theories on the evolution of the structural state.

TRIMETHYLGLYCINE: A VEGETAL STRESS-MOLECULE PERFORMING A WIDE RANGE OF COSMETIC ACTIVITY

  • L. Rigano;K. Jutila
    • 대한화장품학회:학술대회논문집
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    • 대한화장품학회 2003년도 IFSCC Conference Proceeding Book II
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    • pp.192-199
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    • 2003
  • Trimethylglycine, commonly named betaine, is the most simple amphoteric molecule. It is completely vegetal (1,2), as it is produced in the sugar industry by industrial chromatography of molasses. While abundantly used in foods and diet supplements, many interesting applications in cosmetics have recently been investigated, like its capability to increase the volume and stability of foams in surfactant solutions. For its special chemical structure (it is the internal salt of a weak acid and a strong alkali) trimethylglycine is a solvent and buffering agent for strong acids and Lewis' acids. It allows to improve the efficiency of $\alpha$- and $\beta$-hydroxy acids in increasing the physiological rate of epidermal cell renewal, while keeping a low skin-irritation level. In oral care cosmetics, it acts as a mucous membrane protectant (3). For its special water co-ordination capability, its solubilising power, polymer swelling capability, after-feel improvement in hair products, skin moisturization and elasticity enhancing properties, trimethylglycine provides unusual characteristics to many products intended for skin maintenance (4).(omitted)

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변압기 용량 지수를 이용한 수용률 산정 시뮬레이터 개발에 관한 연구 (Study on Simulator for computing Demand Rate using Index of Transformer's Demand Rate)

  • 김영일
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2007년도 학술대회 논문집 전문대학교육위원
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    • pp.97-100
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    • 2007
  • There are regulations on each building for its classification and It is corresponding determined contract demand. For transformer's capability calculation algorithm, cumulated power information of each customer is used to analysis the correlation between power usage and Demand Rate. By modeling this using Least Square Method, it can be targeted to recognize the pattern of transformer use in the past and make a prediction on it in the future.

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사석마운드 위에 설치되는 조력발전용 수문 케이슨의 통수성능에 대한 실험적 연구 (Experimental Investigation on the Change of Water Discharge Capability of Sluice Caisson for Tidal Power Plant Placed on the Rubble Mound)

  • 이달수;오상호;이진학;박우선;조휴상;엄현민
    • 신재생에너지
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    • 제4권2호
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    • pp.94-104
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    • 2008
  • The change of water discharge capability of sluice caisson for tidal power plant according to installation of the rubble mound was investigated by performing laboratory experiment. The experiment was carried out in an open channel flume with a great care to measure flow rate and water level in the flume accurately. Eight different sluice caisson models were used in the experiment. The water discharge capabilities of seven sluice models decreased with respect to the placement of the rubble mound, while increased for only one sluice model. On average, the values of discharge coefficient decreased by approximately 10% when the sluice models were placed on the rubble mound. It is concluded that the shape of the rubble mound can affect the water discharge capability of the sluice caisson, so that its shape should be significantly considered in the design of the sluice caisson, especially when it is deployed in a site of relatively deeper depth.

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ZnO 나노분말로 제조한 Bi계 바리스터의 써지내량 특성 (Characteristics on the Surge Capability of Bi-based Varistor Fabricated with ZnO Nano-powder)

  • 왕민성;박춘배
    • 한국전기전자재료학회논문지
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    • 제19권9호
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    • pp.862-867
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    • 2006
  • Bi-based nano-varistors and micro-varistors fabricated with each ZnO nano-powder and micro-powder were studied about characteristics on the surge capability in this study. ZnO nano-varistors were sintered in air at $1050^{\circ}C$ for 2 hr. The voltage-current and residual voltage properties of ZnO nano-varistor were compared with their of ZnO micrio-varistor. As a result of these properties, our ZnO nano-varistor has about 3 times at operating voltage as compared with conventional ZnO varistor fabricated with micro-powder and the residual voltage was 8.06 kV at nominal discharge current 101kA in the lighting impulse current test. And then the residual voltage rate 1.72 of our nano-varistor has had better performance than the 1.79 of micro-varistor because ZnO nano-varistor has shown much quick response property because of increasing effective cross-section area. Also, to analysis surge capability took thermal images for pyrexia temperature distribution with each of the varistors after operating varistors. Nano-varistor doesn't have shown local overheating and can confirm accurate temperature grade on the surface of its.