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Qualitative and Quantitative Analysis of GMAW Welding Fault Based on Mahalanobis Distance
Feng Shengqiang,Otsuka Hiroyuki,Terasaki Hidennori,Komizo Yuichi,Hu Shengsun 한국정밀공학회 2011 International Journal of Precision Engineering and Vol. No.
The concept of calculating Mahalanobis distance (MD) was introduced in order to describe welding faults. First, a set of weldments without any faults were generated in a number of repeated sessions in order to be used as references. The values of Mahalanobis distance obtained from the reference weldments were taken as a reference or a standard. Then, additional weldments were fashioned while artificial changing the flow rate of shielding gas and types of contact tips and simultaneously obtaining values for arc voltage and current at a rate of more than 8000 samples per second. Last,Mahalanobis distances for voltage and current values were calculated and used for qualitative and quantitative analysis with comparison to values obtained from the reference welds. The results described in this article confirm that Mahalanobis distances based on the short-term changes of welding parameters can be feasibly and effectively used for quality rating of welding faults in gas metal arc welding.
Enhancement of Charge Ordering by the Zeeman Effect in One-dimensional Molecular Conductors
Hideo Yoshioka,Hitoshi Seo,Yuichi Otsuka 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The effects of an external magnetic field on the charge-ordered state are investigated within theone-dimensional extended Hubbard model with a quarter-filled band. We find that the externalmagnetic field leads to a coexistent state with three order parameters, i.e., the charge ordering, theuniform, and the staggered magnetic moments. In addition, the amplitude of the charge orderingis shown to be enhanced by the magnetic field.
Development of Web-based Design Review System for Reliability and Safety Knowledge Management
유이치 오츠카,타카시 유카와,요시하루 뮤토,Otsuka, Yuichi,Yukawa, Takashi,Mutoh, Yoshiharu The Korean Society of Safety 2010 International Journal of Safety Vol.9 No.2
This paper describes a web-based design review system as a knowledge management system relating reliability and safety system design. Since people's consciousness for safety and security become sensitive and increases the need of establishing a proactive prevention method for internal failures and relating risks in products. It also means that prevailing tacit knowledge in retired workers, in order to transform them to be easily used to support new system development, become more important. When considering safety and reliability design, at least two data sheet are necessary; Failure Modes and Effects Analyses (FMEA) and Risk Assessment (RA). These two data are practically made separately. However, it includes the concerns that a risk by failures during long-term use may not be noticed. To overcome this insufficiency, a support tool for integrating reliability evaluation and risk assessment data simultaneously is expected to be revealed. The authors have then developed a web-based design review system for reliability and safety system design. The system include various profitable functions; making FMEA and RA sheet, retrieving past data sheet for engineering change management and new product development and web-based discussion to increase the efficiency of discussion. The system is applied to one practical development works in order to demonstrate its effectiveness that is to be made clear by interviewing user's qualitative comment.