This paper presents an Internet‐based virtual machining system which applies virtual manufacturing technology to machining processes of CNC machining center. The system is…
This paper presents an Internet‐based virtual machining system which applies virtual manufacturing technology to machining processes of CNC machining center. The system is implemented to execute digital machining and verification, to transmit the NC code data to related machining centers after confirming the properness of virtual machining, and to manipulate the machine through the Internet. Also, this research proposes a basic structure that can monitor the status of machines via the Internet. By applying simulation techniques for machining processes, a simple manipulation and monitoring system of machining centers is realized. This entire system is constructed by adopting the latest information technology such as object‐oriented method, middleware, Internet programming, and client‐server structure.
This paper investigates the impact of structural breaks on volatility spillovers between Asian stock markets (China, Hong Kong, India, Indonesia, Japan, Korea, Singapore…
This paper investigates the impact of structural breaks on volatility spillovers between Asian stock markets (China, Hong Kong, India, Indonesia, Japan, Korea, Singapore, and Taiwan) and the oil futures market. To this end, we apply the bivariate DCC-GARCH model to weekly spot indices during the period 1998-2015. The results reveal significant volatility transmission for the pairs between the Asian stock and oil futures markets. Moreover, we find a significant variability in the time-varying conditional correlations between the considered markets during both bullish and bearish markets, particularly from early 2007 to the summer of 2008. Using the modified ICSS algorithm, we find several sudden changes in these markets with a common break date centred on September 15, 2008. This date corresponds to the collapse of Lehman Brothers which is considered as our breakpoint to define the global financial crisis. Also, we analyse the optimal portfolio weights and time-varying hedge ratios based on the estimates of the multivariate DCC-GARCH model. The results emphasize the importance of overweighting optimal portfolios between Asian stock and the oil futures markets.
In the architecture, engineering and construction (AEC) industry, technology developers have difficulties in fully understanding user needs due to the high domain…
In the architecture, engineering and construction (AEC) industry, technology developers have difficulties in fully understanding user needs due to the high domain knowledge threshold and the lack of effective and efficient methods to minimise information asymmetry between technology developers and AEC users. The paper aims to discuss this issue.
A synthetic approach combining domain knowledge and text mining techniques is proposed to help capture user needs, which is demonstrated using building information modelling (BIM) apps as a case. The synthetic approach includes the: collection and cleansing of BIM apps’ attribute data and users’ comments; incorporation of domain knowledge into the collected comments; performance of a sentiment analysis to distinguish positive and negative comments; exploration of the relationships between user sentiments and BIM apps’ attributes to unveil user preferences; and establishment of a topic model to identify problems frequently raised by users.
The results show that those BIM app categories with high user interest but low sentiments or supplies, such as “reality capture”, “interoperability” and “structural simulation and analysis”, should deserve greater efforts and attention from developers. BIM apps with continual updates and of small size are more preferred by users. Problems related to the “support for new Revit”, “import & export” and “external linkage” are most frequently complained by users.
The main contributions of this work include: the innovative application of text mining techniques to identify user needs to drive BIM apps development; and the development of a synthetic approach to orchestrating domain knowledge, text mining techniques (i.e. sentiment analysis and topic modelling) and statistical methods in order to help extract user needs for promoting the success of emerging technologies in the AEC industry.
The study seeks to examine the relationship between the implementation of the ISO 9000 quality management system and educational outcomes of schools, measured by student…
The study seeks to examine the relationship between the implementation of the ISO 9000 quality management system and educational outcomes of schools, measured by student achievement on the state‐mandated tests and school attendance rates – graduation rates, in the case of high schools.
The study was conducted using schools in the USA that have implemented ISO 9000. The study employed the Hierarchical Linear Modeling (HLM) technique, taking into account the hierarchically nested data structure of this study.
It was found that: first, there is no relationship between ISO 9000 participation and students' learning outcomes on the state‐mandated tests – both for students in general and economically disadvantaged students in particular, across math and reading, and at all school levels; second, standardization of schooling by ISO 9000 fails to decrease the negative influence of school SES on the overall student achievement of a school; and finally, although ISO 9000 participation is not related to the students' graduation rates in high schools, it is positively associated with the students' school attendance rates in elementary and middle schools.
Given the long‐established institutional features of education such as value‐orientation, diversity, and complexity, ISO 9000, focusing on procedural standardization of classroom activities, may not work well as a quick‐fix solution to improve student learning.
The study suggests that, by helping schools become organized and thus function well in the area of essential school operations such as student and teacher attendance, ISO 9000 could positively influence school performance without threatening other important values such as teachers' professional autonomy and creativity in classrooms.