• Geomechanics and Engineering
• /
• v.13 no.3
• /
• pp.447-458
• /
• 2017

This study proposes a sensitivity analysis method for slope stability based on the least squares support vector machine (LS-SVM) to examine the influencing factors of slope stability. The method uses LS-SVM as an algorithm for machine learning. An appropriate training dataset is established according to the slope characteristics, and a testing dataset is designed orthogonally. Results of the testing data in the experiment design are calculated after training using the LS-SVM model. The sensitivity of the slope stability of each factor is examined via gray correlation analysis. The results are consistent with those of the traditional Bishop analysis and can be used as a reference for optimizing slope design.

• 한국전산유체공학회:학술대회논문집
• /
• 2009.11a
• /
• pp.218-222
• /
• 2009

A level-set (LS) method is presented for computation of boiling phenomena which involve liquid-vapor interfaces that evolve, merge and break up in time, the flow and temperature fields influenced by the interfacial motion, and the microlayer that forms between the solid and the vapor phase near the wall. The LS formulation for tracking the phase interfaces is modified to include the effects of phase change on the liquid-vapor interface and contact angle on the liquid-vapor-solid interline. The LS method can calculate an interface curvature accurately by using a smooth distance function. Also, it is straightforward to implement for two-phase flows in complex geometries. The numerical method is applied for analysis of nucleate boiling on a horizontal surface and film boiling on a horizontal cylinder.

• Journal of computational fluids engineering
• /
• v.9 no.3
• /
• pp.73-80
• /
• 2004

A LS(Level Set) formulation is developed for computing two-phase flows on non- orthogonal meshes. Compared with the VOF(Volume-of-Fluid) method based on a non-smooth volume-fraction function, the LS method can calculate an interfacial curvature more accurately by using a smooth distance function. Also, it is quite straightforward to implement for 3-D irregular meshes compared with the VOF method requiring much more complicated geometric calculations. The LS formulation is implemented into a general purpose program for 3-D flows and verified through several test problems.

• 한국전산유체공학회:학술대회논문집
• /
• 2007.04a
• /
• pp.95-98
• /
• 2007

A general purpose program NUFLEX has been extended for two-phase flows with topologically complex interface and cavitation flows with liquid-vapor phase change caused by large pressure drop. In analysis of two-phase flow, the phase interfaces are tracked by employing a LS(Level Set) method. Compared with the VOF(Volume-of-Fluid} method based on a non-smooth volume-fraction function, the LS method can calculate an interfacial curvature more accurately by using a smooth distance function. Also, it is quite straightforward to implement for 3-D irregular meshes compared with the VOF method requiring much more complicated geometric calculations. Also, the cavitation process is computed by including the effects of evaporation and condensation for bubble formation and collapse as well as turbulence in flows. The volume-faction and continuity equations are adapted for cavitation models with phase change. The LS and cavitation formulation are implemented into a general purpose program for 3-D flows and verified through several test problems.

• Journal of Biomedical Engineering Research
• /
• v.10 no.2
• /
• pp.131-138
• /
• 1989

In this paper the feature of background EEG is extracted by LS Prony Method for the analysis of background EEG in the time domain. Autocorrelation leg estimates are not required with the LS Prony method. The Prony method is required any the solution of two serfs of simultaneous linear equation and a polynominal rooting. That the optimal order of this model is the 6-th order is determined by using Akaike' s Information Criterial test. From the experimential results the alpha band amplitude is the largest among alpha band beta band theta band delta band and beta band amplitude is larger than that of the delta band and theta band. The sustained time for the alph a band, the beta band, the delta band and the theta band is 2, 3461 (sec), 0.6490(sec), 0.3120(sec), 0.7046(sec) respectively. Consequenty the alpha band is maintained in the whole subjects, the beta band, the delta band, the theta band are existed intermittently in each subjects.

• Journal of the Korean Institute of Intelligent Systems
• /
• v.13 no.4
• /
• pp.486-490
• /
• 2003

Software qualify models can predict the risk of faults in the software early enough for cost-effective prevention of problems. This paper introduces a least squares support vector machine (LS-SVM) as a fuzzy regression method for predicting fault ranges in the software under development. This LS-SVM deals with the fuzzy data with crisp inputs and fuzzy output. Predicting the exact number of bugs in software is often not necessary. This LS-SVM can predict the interval that the number of faults of the program at each session falls into with a certain possibility. A case study on software reliability problem is used to illustrate the usefulness of this LS -SVM.

• Proceedings of the IEEK Conference
• /
• 2003.11b
• /
• pp.179-182
• /
• 2003

In this paper, we developed those OpenLS(Open Location Service) Core Services based on the Web-Service, because Web-Service environments provide a suitable method to gather requested information in an appropriate way. The proposed architecture cooperate with OpenLS Core Services( Directory Service, Location Utility Service and Router Determination service) and is an interoperability one - it identifies those global elements of the global Web-Services network that are required in order to ensure interoperability between Web-services. In this paper, a new architecture of OpenLS Core Services is proposed and tested in OpenLS Core Services environments.

• Proceedings of the KIEE Conference
• /
• 2015.07a
• /
• pp.233-234
• /
• 2015

에너지 관리시스템(Energy Management System)을 통해 전력계통을 안정적이고 효율적으로 운영하게 되고 이때 취득데이터의 오류나 통신 불량으로 인한 취득 불가 상태가 발행 하는 것은 상태추정이 추정한 값을 통해 보정할 수 있지만 차단기 상태나, 임피던스의 입력오류 등의 토폴로지에 영향을 주는 부분과 데이터를 상태추정으로 보정한다고 하여도 기본 데이터의 Good상태 유지는 필요하여 논문의 취득 데이터 체크 방안을 제시한다.

• Proceedings of the KIEE Conference
• /
• 2015.07a
• /
• pp.581-582
• /
• 2015

Energy management system (EMS)는 전력시스템에서 운영자에 의해 발전과 송전의 성능을 감시, 제어, 그리고 성능 최적화를 위하여 운영하는 시스템이다. 본 연구에서는 차세대 EMS(Next Generation Energy Management System : NG-EMS)에서 클라이언트 운영 시스템의 자동 동기 방법을 제안한다. 인트라넷 네트워크 망에서 클라이언트 운영 시스템의 효율적인 유지 보수를 위해 운영 소프트웨어 패치 및 엔지니어링을 통해 만들어진 그래픽 화면을 여러 클라이언트에 자동 동기 및 갱신 기능을 특징으로 한다. 또한 자동 동기 빌더를 이용하여 클라이언트에 동기 할 항목을 패키징하는 기능을 포함한다. 본 연구의 구성에 의해 자동 동기 서버 측에서 클라이언트의 동기 및 갱신주기를 효율적으로 관리하다. 클라이언트가 메인으로 접속하여 자동동기 상태를 체크하는 서버에 문제가 발생했을 경우 다중 동기 서버 형태로 운영하여 만일에 발생할 문제에 효율적으로 대처가 가능하다.

• Proceedings of the KSRS Conference
• /
• 2003.11a
• /
• pp.866-868
• /
• 2003

In this paper, we developed those Directory Services based on the Web-Service, because Web-Service environments provide a suitable method to gather requested information in an appropriate way. The proposed architecture cooperate with other OpenLS(Open Location Service) Core Services ( Location Utility Service and Router Determin ation service) and is an interoperability one - it ident ifies those global elements of the global Web-Services network that are required in order to ensure interoperability between Web-Services. In this paper, a new architecture of Directory Service with OpenLS Core Services is proposed and tested in OpenLS Core Services environments.