• 한국품질경영학회:학술대회논문집
• /
• 한국품질경영학회 1998년도 The 12th Asia Quality Management Symposium* Total Quality Management for Restoring Competitiveness
• /
• pp.295-300
• /
• 1998

Recently graphical modelling is being studied as a useful process analysis tool for exploratory causal analysis. Graphical modelling is a presentation method that uses graphs to describe statistical models of the structures of multivariate data. This paper describes an application of this graphical modeling with two cases from the automotive parts industry. One case is the unbalance problem of the pulley, an automotive generator part. There is multivariate data of the product from each of the processes which are connected in the series. By means of exploratory causal analysis between the variables using graphical modeling, the key processes which causes the variation of the final characteristics and their mechanism of the causal relationship have become clear. Another case is, also, the unbalanced problem of automotive starter parts which consists of many parts and is manufactured by complex machinery and assembling process. By means of the similar technique, the key processes are obtained easily and the results are reasonable from technical knowledge.

• Journal of Power Electronics
• /
• 제9권6호
• /
• pp.854-865
• /
• 2009

Super-lift dc-dc converters are a series of advanced step-up dc-dc topologies that provide high voltage transfer gains by super-lift techniques. This paper presents a developed graphical modelling method for super-lift converters and gives a thorough analysis with a consideration of the effects caused by parasitic parameters and diodes' forward voltage drop. The general guidelines for constructing and deriving graphical models are provided for system analysis. By applying it to examples, the proposed method shows the advantages of high convenience and feasibility. Both the circuit simulation and experimental results are given to support the theoretical analysis.

• 한국건설관리학회:학술대회논문집
• /
• 한국건설관리학회 2002년도 학술대회지
• /
• pp.188-191
• /
• 2002

This paper concerns 3-D graphical modeling and simulation techniques for design and control of automated equipment for construction and facility maintenance. A case study on the use of 3-D graphics techniques for developing a power plant maintenance robot is presented. By simulating equipment operation within the 3-D geometry models of the work environment the environment design was improved. The 3-D graphical models of the equipment and the work environment were further utilized for the control of the robot from a remote distance. By presenting the real-time updated equipment configuration and the work environment to the operator, the graphical model-based equipment control system helped the operator overcome the problems associated with spatial perception. The collision between the robot and the plant structures was also avoided based the real-time analysis of the dynamically updated graphical models.

• 품질경영학회지
• /
• 제30권2호
• /
• pp.72-85
• /
• 2002

Advances in computer and sensor technology have made it possible to obtain superlarge manufacturing process data in real time, letting us extract meaningful information from these superlarge data sets. We propose a systematic data analysis procedure which field engineers can apply easily to manufacture quality products. The procedure consists of data cleaning and data analysis stages. Data cleaning stage is to construct a database suitable for statistical analysis from the original superlarge manufacturing process data. In the data analysis stage, we suggest a graphical easy-to-implement approach to extract practical information from the cleaned database. This study will help manufacturing companies to achieve six sigma quality.

• 한국실천공학교육학회논문지
• /
• 제3권2호
• /
• pp.83-92
• /
• 2011

기계진동학 문제의 해석을 위한 전산프로그램이 비주얼 C++을 이용하여 개발되었다. 이 프로그램은 일반적인 기계진동학 교재에서 다루는 내용에 맞추어 구성되어 있다. 이 프로그램은 매뉴방식을 택하고 있으며, GUI(graphical user interfaces)방식을 도입하고 있다. 문제에 대한 해는 그래픽과 수치 데이터로 표현된다. 예제를 통해 프로그램의 효율성과 응용 가능성을 보여준다. 이 프로그램은 기계시스템의 진동거동을 해석하는데 활용될 수 있다.

• 응용통계연구
• /
• 제6권1호
• /
• pp.1-11
• /
• 1993

통계자료분석에서 그래픽에 의한 분석방법은 컴퓨터의 급속한 발전과 더불어 많은 기법이 개발되어 왔으며, 이는 자료에 내포된 정보 및 통계적인 모형선택방법에 유용하게 이용될 수 있다. 개인용 컴퓨터에서 그래픽 자료 분석방법에 다양하게 응용될 수 있는 소프트웨어로서 S-PLUS(version 2.0)를 소개하고, 그래픽기능의 관점에서 SAS/GRAPH(version 6.04)와 비교, 논의하고자 한다.

• Computers and Concrete
• /
• 제16권2호
• /
• pp.287-309
• /
• 2015

FormWorks-Plus is a generalized public domain user-friendly preprocessor developed to facilitate the process of creating finite element models for structural analysis programs. The lack of a graphical user interface in most academic analysis programs forces users to input the structural model information into the standard text files, which is a time-consuming and error-prone process. FormWorks-Plus enables engineers to conveniently set up the finite element model in a graphical environment, eliminating the problems associated with conventional input text files and improving the user's perception of the application. In this paper, a brief overview of the FormWorks-Plus structure is presented, followed by a detailed explanation of the main features of the program. In addition, demonstration is made of the application of FormWorks-Plus in combination with VecTor programs, advanced nonlinear analysis tools for reinforced concrete structures. Finally, aspects relating to the modelling and analysis of three case studies are discussed: a reinforced concrete beam-column joint, a steel-concrete composite shear wall, and a SFRC shear panel. The unique mixed-type frame-membrane modelling procedure implemented in FormWorks-Plus can address the limitations associated with most frame type analyses.

• 대한산업공학회지
• /
• 제42권4호
• /
• pp.249-255
• /
• 2016

Recently, transaction data is accumulated everywhere very rapidly. Association analysis methods are usually applied to analyze transaction data, but the methods have several problems. For example, these methods can only consider one-way relations among items and cannot reflect domain knowledge into analysis process. In order to overcome defect of association analysis methods, we suggest a transaction data analysis method based on probabilistic graphical model (PGM) in this study. The method we suggest has several advantages as compared with association analysis methods. For example, this method has a high flexibility, and can give a solution to various probability problems regarding the transaction data with relationships among items.

• 응용통계연구
• /
• 제20권3호
• /
• pp.619-634
• /
• 2007

자료분석과정에서 그래프의 이용은 필수적이라고 하겠다. 다양하게 개발된 수많은 그래픽 기법들을 적절하게 사용할 수 있다면 한 단계 업그레이드된 통계분석이 가능할 것이며, 이런 면에서 볼 때 통계그래픽스는 통계학을 전공하는 학생들에게 꼭 필요한 강좌라고 할 수 있다. 다양하게 개발된 그래픽 기법의 막강한 파워를 제대로 느끼기 위해서는 적절한 통계 소프트웨어의 선택이 매우 중요한 문제라고 할 수 있는데, 뛰어난 그래픽 기능이 있는 R을 사용하는 것이 효율적으로 다양한 그래픽 기법을 구현할 수 있는 가장 바람직한 선택이라고 하겠다. 이 논문에서는 통계 그래픽스를 R을 이용하여 구현하는 강좌를 개설하고자 하는 경우에 사용할 수 있는 적절한 교과내용을 제안하고, 어떤 방식으로 강의하는 것이 가장 효과적인지에 대한 고민을 함께 해 볼 수 있는 기회를 제공하고자 한다.

• Journal of Power Electronics
• /
• 제19권6호
• /
• pp.1440-1448
• /
• 2019

In wireless power transfer systems, it is important to design resonant energy links in order to increase the power transfer efficiency and to obtain desired system performances. This paper proposes a method for designing and analyzing the resonant energy links in a series-series configured IPT (inductive power transfer) system using the FOM-rd plane. The proposed FOM-rd graphical design plane can analyze and design the voltage gain and the power efficiency of the energy links while considering changes in the misalignment between the coils and the termination load condition. In addition, the region of the bifurcation phenomena, where voltage gain peaks are split over the frequency, can also be distinctly identified on the graphical plane. An example of the design and analysis of a 100 W inductive power transfer system with the proposed method is illustrated. The proposed method is verified by measuring the voltage gain and power efficiency of implemented hardware.