• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2007.11a
• /
• pp.770-773
• /
• 2007

As higher reliability and accuracy on production facilities are required to detect incipient faults, a diagnostic system for predictive maintenance of the facility is highly recommended. In this paper, it presents a study on the application of vibration signals to diagnose faults for a Rotating Machinery using the Mahalanobis Distance-Taguchi System. RMS, Crest Factor and Kurtosis that is known as the Statistical Methods and the spectrum analysis are used to diagnose faults as parameters of Mahalanobis distance.

• Proceedings of the Safety Management and Science Conference
• /
• 2005.11a
• /
• pp.300-310
• /
• 2005

Mahalanobis Taguchi System (MTS) is developed by Genishi Taguchi as a part of his quality engineering methodology. The basic idea of Taguchi's quality engineering is looking for the way of effectiveness of analyzing multivariate system. In the MTS, with the standardized variables of healthy normal data, Mahalanobis Distance(MD) calculated and that can be discriminate between normal and abnormal objects. If this discrimination process is successful, next step is optimization which is try to reduce number of attributes by neglecting less effective attributes to MD. Orthogonal Array (OA) and Signal to Noise ratio (S/N) are used to evaluate the amount contribution of each attribute to the MD. Wisconsin Breast Cancer study, from machining learning repository at University of California at Irvine, used for examining the discriminant ability of MTS.

• Journal of Korean Institute of Industrial Engineers
• /
• v.39 no.5
• /
• pp.393-402
• /
• 2013

The Mahalanobis-Taguchi System (MTS) is a diagnostic and predictive method for multivariate data. In the MTS, the Mahalanobis space (MS) of reference group is obtained using the standardized variables of normal data. The Mahalanobis space can be used for multi-class classification. Once this MS is established, the useful set of variables is identified to assist in the model analysis or diagnosis using orthogonal arrays and signal-to-noise ratios. And other several techniques have already been used for classification, such as linear discriminant analysis and logistic regression, decision trees, neural networks, etc. The goal of this case study is to compare the ability of the Mahalanobis-Taguchi System and logistic regression using a data set.

• Proceedings of the KSR Conference
• /
• 2004.06a
• /
• pp.1465-1467
• /
• 2004

Compared with other transport means, safety and timeliness are the merits of railways. Unexpectedly when accident happens, much time and human strength are required to cope with the accident. And for swift recovery, systematic rehabilitation is needed. Recently using MTS(Moving picture Transmission System), we can perform accident rehabilitation and recording work efficiently. MTS is the device that transmits continuous picture information from accident field to control center. e are developing the appropriate system to railway situation to make use of the existing information communication technology, processing technology of video-tex, super high speed transmission technology through fiber-optic, copper cable and network description of information Technology, etc. If these communication-based can technologies are applied to railway system, railway managers can control the accident by inspecting the picture of accident field and can contribute to the safe train operation and the improvement of railway management. In this paper, we investigate the connecting methods when optical fiber is used for moving picture data transmission of train accidents, and its problems. And, we validate MTS's performance through about 28km section of field test.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 2006.05a
• /
• pp.1139-1146
• /
• 2006

최근 고객의 다양한 요구로 인하여 기존 계획 생산이던 생산 환경이 주문 생산과 혼합된 혼합 생산 환경으로 바뀌고 있다. 본 연구에서는 이러한 생산 환경의 변화로 다양한 산업에서 대두되고 있는 Hybrid MTO(make-to-order)-MTS(make-to-stock) 생산 환경을 대상으로 하여 임의로 발생하는 MTO 제품의 생산 시기 결정 및 이로 인하여 변화하는 MTS 제품의 생산 계획을 고려한 몇 가지 production policies를 제시하였다. 각 정책의 특징 및 규칙을 설명하였으며 실험을 통하여 각 모델별 성능을 Cycle time, Cost, Customer Satisfaction 측면에서 비교하여 다양한 생산 정책에 적합하도록 MTO 제품 생산 시기 결정을 내릴 수 있게 하였다.

• Transactions of the Korean Society for Noise and Vibration Engineering
• /
• v.18 no.6
• /
• pp.619-623
• /
• 2008

As higher reliability and accuracy on production facilities are required to detect incipient faults, a diagnostic system for predictive maintenance of the facility is highly recommended. In this paper, it presents a study on the application of vibration signals to diagnose faults for a rotating machinery using the Mahalanobis distance-Taguchi system. RMS, crest factor and Kurtosis that is known as the statistical methods and the spectrum analysis are used to diagnose faults as parameters of Mahalanobis distance.

• The Korean Journal of Applied Statistics
• /
• v.25 no.4
• /
• pp.589-603
• /
• 2012

Mahalanobis-Taguchi system(MTS) is a statistical tool for classifying the normal group and abnormal group in multivariate data structures. In addition to the classification itself, the MTS uses a method for selecting variables useful for the classification. This method can be used efficiently especially when the abnormal group data are scattered without a specific directionality. When the feedback adjustment procedure through the measurements of the process output for controlling process input variables is not practically possible, the reset procedure can be an alternative one. This article proposes a reset procedure using the MTS. Moreover, a method for identifying input variables to reset is also proposed by the use of the contribution. The identification of the root-cause parameters using the existing dimension-reduced contribution tends to be difficult due to the variety of correlation relationships of multivariate data structures. However, it became possible to provide an improved decision when used together with the location-centered contribution and the individual-parameter contribution.

• Proceedings of the Korean Information Science Society Conference
• /
• 2000.04a
• /
• pp.492-494
• /
• 2000

컴포턴트 기반 소프트웨어 개발(CBD)은 점차 대중화되어 가고 있는 소프트웨어 개발 방법이며, 최근에는 여러 미들웨어들이 서버 컴포넌트를 이용한 CBD를 지원하고 있다. 본 논문에서는 Microsoft Transaction Server(MTS)를 이용하여 서버 컴포넌트를 기반으로 안전한 트랜잭션 시스템을 디자인하고 검증하는 방법을 제시한다. 위의 목적을 위해 우선 MTS를 이용한 트랜잭션 시스템을 정형화하고, 정형화된 프레임워크를 이용해, 디자인한 시스템이 명세를 만족하는지 검증해 볼 것이다. 또, 위의 프레임워크를 위해 MSDN에 있는 은행 시스템을 예로 들어서 그 시스템이 만족해야 하는 명세를 위배한다는 것을 보이고, 명세를 위배하지 않도록 시스템의 설계를 변경할 것이다. 우리는 MTS에서 컴포넌트가 트랜잭션에 참여하는 방식이 시스템의 확장성과 안전성에 영향을 줄 수 있다고 생각하며, 그렇기 때문에, 우리가 제시한 프레임워크가 트랜잭션 시스템의 안전성과 확장성을 평가하는데 있어 유용할 것으로 기대한다.

• Animal cells and systems
• /
• v.2 no.2
• /
• pp.209-216
• /
• 1998

The invasion of Ambrosia artemisiifolia in the Ukrainian Carpathians Mts. and the Transcarpathian Plain in Central Europe was reconstructed on the basis of floristic records. The first spontaneous occurrence was dated from the beginning of the 1940s. Within the next 55 year period, the distributional spread speed of the species was of 67.6 $km^2/y$ (by the average data). The occupied area by A. artemisiifolia in the range of the studied areas is about $3716.5km^2$ now. The features of behavior of the invader and the habitat preference were determined. The frequency of occurrence by sociologic-ecological classification was carried out. The generalized model of correlations among the gravitation, the active temperature sum and the disturbance gradients and the frequency of occurrence of the species was presented. The scheme of the invasion stages of A. artemisiifolia is reflected in the population status changes of the species during the areal dynamics.

• Proceedings of the KAIS Fall Conference
• /
• 2006.11a
• /
• pp.180-185
• /
• 2006

자기 유사성(self-similarity)은 다양한 네트워크 환경에서 공통적으로 발생하는 현상인 것으로 정체 제어에서 자기 유사성 트래픽의 장거리 상관 구조를 활용할 가능성과 MTS(Multiple Time Scale) 정체 제어의 프레임워크를 발전시켜, 이 프레임워크가 전송 율 기반 피드백 제어의 성능을 향상시키는 데 시뮬레이션을 통해 트래픽 조건으로 다음과 같이 연구한다. 자기유사성 트래픽 조건에서 3가지 단계로 구성한다. 먼저 TCP의 모듈 형 확장에서 Tahoe, Reno, Vegas등 다양한 버전의 TCP에 적용되는 간단한 인터페이스를 통한 함수 호출을 정의하고, 이것이 성능을 크게 향상시는 것을 입증한다. 두 번째로, 광대역 WAN에서 지연-대역폭의 곱이 높을 경우 더욱 심각해지는 사후 제어의 불확실성 차이를 해소함으로써 MTS TCP가 기반 피드백 제어에 사전성을 부여한다는 것을 입증한다. 세번째는 트래픽 제어의 3가지 차원인, 즉 추적 능력, 연결 지속 기간, 공정성이 성능에 미치는 영향 등을 비교 분석하여 입증한다.