试论氯碱行业推行ISO14000环境管理体系认证的必要性

对我国氯碱行业现状及现存问题进行了分析,指出在该行业推行ISO14000环境管理 体系认证的必要性,以全面提升我国氯碱行业的管理水平,提高企业的市场竞争能力,促进环境与 经济的协调发展。     

Impedance spectroscopy study of hardened Portland cement paste

In this paper, the differential impedance analysis (DIA) has been applied to the study of the dielectric properties of hardened Portland cement paste. Two time constants are found in the impedance spectra obtained in the frequency region form 100 kHz to 15 MHz. One time constant has been attributed to the solid matrix and the other one to the liquid phase filling the pores. The effect of the cement paste-electrodes interface has been quantified using two different experimental set-ups. Measurements using direct contact between electrodes and cement paste have been compared with measurements using an air gap technique in which the specimen “floats” between the electrodes. The two referred time constants have been found in both types of measurements. The influence of drying on the dielectric parameters is also studied.     

Are U.K. Citizens Satisfied With E-Government Services? Identifying and Testing Antecedents of Satisfaction

Citizens’ satisfaction is acknowledged as one of the most significant influences for e-government adoption and diffusion. This study examines the impact of information quality, system quality, trust, and cost on user satisfaction of e-government services. Using a survey, this study collected 1518 valid responses from e-government service adopters across the United Kingdom. Our empirical outcomes show the five factors identified in this study have a significant impact on U.K. citizens’ satisfaction with e-government services.     

Thematic orientation of the ISJ within a semantic space of IS research

This study examines research published in the first 24 years of Information Systems Journal's (ISJ) publication history using a thematic space of all information systems (IS) research as the backdrop. To that end, abstracts from all contributing articles published in eight prominent IS journals in the period 1991–2014 were analysed to extract a latent semantic space of five broad research areas. A two‐dimensional projection of the results was used to create a two‐by‐two map, where one dimension represents the European vs. North American style of IS research and another dimension represents a micro vs. macro level of IS research. The ISJ is positioned in the ‘micro and European school’ quadrant. Over the course of the journal's first 24 years, research in the ISJ started with a relative focus on the IT artefact and IS development and gradually moved towards a more balanced position that includes a considerable amount of research on IT for teamwork and collaboration, as well as on IT and individuals.     

Role Negotiation and Interaction: An Exploratory Case Study of the Impact of Management Consultants on ERP System Implementation in SMEs in Taiwan

Abstract

With growing pressures for collaborative information systems (IS) partnerships, Enterprise Resource Planning (ERP) implementation has been an important activity for improving supply chains efficiency in Small and Medium-Sized Enterprises (SMEs). Historically ERP consultants usually take a product-selling approach in SMEs, providing limited management consultancy services. However, a more constructive role for management consultants has become an emerging and challenging issue. This study explored the involvement of management consultants in ERP implementation, particularly with internal managers, ERP consultants and other project members. Extensive interviews were conducted with management consultants as well as 47 project members from four different SMEs in Taiwan employing ERP consultants. Using a grounded theory methodology, prior literature was used to sensitize the findings to key concepts of importance. The results were then analyzed and we described how owner-managers regard management consultants and how the consultants use role negotiation skills to work with both internal managers and ERP consultants. The study found resistance toward management consultants primarily from managers in SMEs, and not owner-managers. The relationships between management consultants and SME managers also differed from similar relationships in large organizations. Suggestions are also provided for academics and practitioners along with areas for future research to extend these exploratory findings.     

System Project Failure: The Heuristics of Risk

Abstract

System project failures are a well-known part of systems development; however, all the potential risks of planning and executing a project effort are not This article offers heuristic guidelines to help IS managers assess these inherent risk factors before initiating and while executing a project. Case examples illustrate how a particular risk factor can result in a failed systems development effort.     

Understanding post‐adoption IS usage stages: an empirical assessment of self‐service information systems

Organisations have invested in self‐service information systems (IS) to provide a direct interface for service delivery. Enriching the usage of these systems can provide organisations with immense benefits. However, limited research has been directed towards understanding post‐adoption IS usage behaviour in general and specifically in the context of self‐service IS. This study proposes post‐adoption IS usage behaviour as a broader concept constituting feature level usage of IS, integration of IS in the work system and exploration of new uses of IS. We evaluate how the new conceptualisation can be used to classify users at different stages of self‐service IS usage. Further, we examine user perceptions that differentiate among the users situated at different self‐service IS usage stages. Data were collected in the context of a self‐service Web‐based IS to validate the post‐adoption IS usage constructs and to examine the proposed thesis. The newly developed conceptual structure and measures for post‐adoption IS usage behaviour exhibit strong psychometric properties. The analysis shows three distinct post‐adoption IS usage stages and highlights that usefulness, user‐initiated learning, ease of use, satisfaction and voluntariness of use differentiate users at the different stages of post‐adoption IS usage. The results show that these variables aggregate into value confirmation and learning orientation as two higher‐level concepts. Further, we evaluate the predictive efficacy of the research model in classifying users into different post‐adoption self‐service IS usage stages. Implications are drawn for future research.     

Leadership and justice: Increasing non participating users’ assessment of an IT through passive participation

Allowing users to actively participate in the development and implementation of a new IS is supposed to increase their satisfaction with it. This type of participation, representing aspects relating to distributive and procedural justice, is increasingly impractical in current organizational settings, because many IS are used by thousands of employees and having them involved is impossible. Nonetheless, there are still benefits to be gained in other ways. Extrapolating from interactional justice, we proposed a passive participation method of engaging users. Its effect was tested in a large company in the USA and proved effective. Interactional justice, the perception of fairness in the way that people were treated at an interpersonal level, was found to increase user assessment of the value of their IS. Implications and expansions to interactional justice theory and how this antecedent affects IS implementation are discussed.     

Extending the two‐stage information systems continuance model: incorporating UTAUT predictors and the role of context

This study presents two extensions to the two‐stage expectation‐confirmation theory of information systems (IS) continuance. First, we expand the belief set from perceived usefulness in the original IS continuance model to include three additional predictors identified in the unified theory of acceptance and use of technology, namely effort expectancy, social influence and facilitating conditions. Second, we ground the IS continuance model in the context of transactional systems that involve transmission of personal and sensitive information and include trust as a key contextual belief in the model. To test the expanded IS continuance model, we conducted a longitudinal field study of 3159 Hong Kong citizens across two electronic government (e‐government) technologies that enable citizens' access to government services. In general, the results support the expanded model that provides a rich understanding of the changes in the pre‐usage beliefs and attitudes through the emergent constructs of disconfirmation and satisfaction, ultimately influencing IS continuance intention. Finally, we discuss the theoretical and practical implications of the expanded model.     

基于听觉感知模型的多通道语音增强系统

提出以模拟听觉感知模型的非均匀滤波器组为基础的多通道语音增强系统,与基于均匀滤波器组的语音增强系统相比,该方法达到相同频率分辨率所需的通道数较少。采用Itakura-Saito距离对系统进行客观评价,仿真结果表明,该系统增强后的语音比均匀多通道系统增强后的语音具有更好的改善效果。