• Journal of Mechanical Science and Technology
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• 제18권9호
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• pp.1493-1499
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• 2004

This paper describes the speckle shearing interferometry, a non-destructive optical method, for quantitative estimation of void defect and monitoring separation defect inside of a pneumatic tire. Previous shearing interferometry has not supplied quantitative result of inside defect, due to effective factors. In the study, factors related to the details of an inside defect are classified and optimized with pipeline simulator. The size and the shape of defect can be estimated accurately to find a critical point and also is closely related with shearing direction. The technique is applied for quantitative estimation of defects inside of a pneumatic tire. The actual traveling tire is monitored to reveal the cause of separation and the starting points. And also unknown void defects on tread are inspected and the size and shape of defects are estimated which has good agreement with the result of visual inspection.

• 대한예방의학회:학술대회논문집
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• 대한예방의학회 2005년도 제57차 추계 학술대회 연제집
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• pp.488-488
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• 2005

• 전력전자학회:학술대회논문집
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• 전력전자학회 2004년도 전력전자학술대회 논문집(2)
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• pp.575-578
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• 2004

The performance of an active power filter(APF) depends on the inverter characteristic, the control method, and the accuracy of reference signal generator. The accuracy of reference generator is the most critical item to determine the performance of active power filter. This paper introduces a novel reference signal generator composed of improved adaptive predictive filter. The performance of proposed reference signal generator was first verified through a simulation with MATLAB. Furthermore, the application of feasibility was evaluated through experimenting with a single-phase APF prototype based on the proposed reference generator, which was implemented using the TMS320C31 floating-point signal processor. Both simulations and experimental results confirm that our reference signal generator can be used successfully in practical active power filters.

• Journal of the Optical Society of Korea
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• 제18권6호
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• pp.788-792
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• 2014

It has been a critical issue to reduce the size of spectrometers in many fields such as on-chip chemical and biological sensing. The proposed plasmonic channel-waveguide with a sub-micrometer width has a cutoff frequency which enables us to control wavelength dependent propagation properties. We focused on the capability of the waveguide for spectral-to-spatial mapping when the waveguide width changes gradually. In this paper, we propose a plasmonic tapered channel-waveguide structure as a compact spectrometer with a physical size of $0.24{\times}2.0{\times}0.20{\mu}m^3$. The scattering point just above the tapered waveguide moves linearly depending on the wavelength of the injecting light. The spectral-to-spatial mapping can be improved by increasing the tapered length.

• 식품기술
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• 제13권3호
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• pp.3-16
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• 2000

신선 채소류 편의식품에 관련된 병원성 세균으로는 Listeria monocy togenes, Yersinia enterocolytica,A eromonas hydrophila 등이 포함된다. 이들 제품은 미생물(병원성 및 비병원성)을 감소시키거나 사멸시키기 위해 별도의 살균 또는 항균제재를 사용하지 않기 때문에 초기 원료에 존재하거나 혹은 가공 및 유통 과정에서 오염된 미생물이 제품에 그대로 존재할 수 있다. 따라서 이들 제품에서는 병원성 세균이 발견될 수도 있으며, 특히 냉장유통 중 온도조절이 불완전할 경우 그 가능성이 더욱 높아지므로 신선 편의식 채소류 제품에 대해서는 보다 철저한 위생관리가 필요하다. 이러한 측면에서 위해 요소 중점관리기법(Hazard Analysis Critical Control Point, HACCP)을 적용하면 미생물학적 안전성을 확보할수 있다. HACCP이란 특정 제품의 수확에서 소비까지 전 공정에 대해 위해 요소를 검토하고, 이를 조절하기 위한 특별한 수단을 규정하는 관리기법이다. 본 연구에서는 HACCP의 7가지 기본 원칙을 정리하여 실제 대파(green onion)의 최소가공 과정에 적용함으로서 미생물학적 안전성을 확보하고자 시도한 사례를 중심으로 검토하였다.

• 한국조리학회지
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• 제7권1호
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• pp.57-90
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• 2001

We investigated the unequivalence of Food Sanitation law, School Foodservice law and recent reports studied about hazard analysis critical control point(HACCP) system. We also found out that cook's duties were expressed several times in the standard job classification in Korea national statistical office based by the international labor organization(ILO) since 1963, but not ever in the Food Sanitation law and School Foodservice law. Based on these investigations We propose clear expression of cook's duties in the Food Sanitation law and School Foodservice law, and enactment of regulation or law of Cook to reduce any possible food poisonings. However these proposals need to be studied and improved in many different ways for the revision and enactment of the law of cook.

• Journal of applied mathematics & informatics
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• 제26권5_6호
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• pp.1191-1205
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• 2008

We consider a delayed predator prey model. The local stability and Hopf bifurcation results are stated taking the time delay as a control parameter. We apply multiple scale analysis to analyze the effects of additive white noises near the Hopf bifurcation point at the positive interior equilibrium state. The governing equations for the amplitude of oscillations on a slow time scale are derived. We identify the process of amplitude of oscillations and derive its transient properties. We show that oscillations, which would decay in the deterministic system whenever time delay lies below its critical value, persists for long time under the validity of multiple scale analysis.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권1호
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• pp.340-367
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• 2018

Storage services integration can be done for achieving high availability, improving data access performance and scalability while preventing vendor lock-in. However, multiple services environment management and interoperability have become a critical issue as a result of service architectures and communication interfaces heterogeneity. Storage federation model provides the integration of multiple heterogeneous and self-sufficient storage systems with a single control point and automated decision making about data distribution. In order to integrate diverse heterogeneous storage services into a single storage pool, we are proposing a storage service federation framework named BoxBroker. Moreover, an automated decision model based on a policy-driven data distribution algorithm and a service evaluation method is proposed enabling BoxBroker to make optimal decisions. Finally, a demonstration of our proposal capabilities is presented and discussed.

• 상하수도학회지
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• 제25권6호
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• pp.847-859
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• 2011

This paper presents an alarm system for the integrated monitoring and control station of waterworks in Daegu City. An alarm system informs the operator or other responsible individuals about the abnormality in the process so that an appropriate action can be taken. In practice, operators receive far more false and nuisance alarms than valid and useful alarms. Too many false and nuisance alarms can distract the operator from operating the plant, and thus critical alarms may be ignored. This problem can lead to the point that the operator no longer trusts the alarms or even shuts down the whole monitoring system. This paper proposes an efficient method to reduce false and nuisance alarms by prioritizing every fault using the Fault Tree Analysis (FTA) technique. The effectiveness of the proposed method is evaluated with a set of computer simulation under various faulty conditions.

• 한국유가공학회:학술대회논문집
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• 한국유가공기술과학회 1997년도 춘계 제45회 유가공 심포지움
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• pp.1-49
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• 1997

HACCP팀은 모든 종사자(소유자 포함)에 대한 기구조직표, 역할분담 및 인수인계사항을 작성하고 모든 종사자는 사전에 HACCP system에 대해 충분히 이해시킬것. 또한 자체 위생관리현황이나 법적 관련규정을 정확하게 이해할 것. HACCP(준비)팀은 HACCP system의 적용을 위한 식품 품목 또는 유형, 시설, 공정단계, 지역 및 위해요인 종류의 범위를 정확하게 결정하여 문서화할 것. 제품설명서와 공정흐름도는 이후 단계에 매우 중요한 기초정보를 제공한다. 따라서 현장을 확인하는 등 사실에 입각하여 정확하게 작성할 것. 위해분석은 인내심을 가지고 현실성을 고려한 충분한 기초자료를 이용하여 정확하게 수행할 것. CCP의 결정전에 위해방지방법, 허용수준, 관리자를 결정하고 해당공장내이 현실성을 고려하여 CCP를 결정할 것. 관리기준 및 허용오차는 물리화학적 인자에 대하여 충분한 기초자료를 통해 설정할 것. CCP에 대한 모니터링과 개선조치 방법을 6하원칙에 준하여 현장생산종사자 중심으로 구체적으로 작성할 것. 모니터링과 검증은 명확하게 구분하여 관리할 것.