1,740 research outputs found

    A web-based collaborative decision making system for construction project teams using fuzzy logic

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    In the construction industry, the adoption of concurrent engineering principles requires the development of effective enabling IT tools. Such tools need to address specific areas of need in the implementation of concurrent engineering in construction. Collaborative decision-making is an important area in this regard. A review of existing works has shown that none of the existing approaches to collaborative decision-making adequately addresses the needs of distributed construction project teams. The review also reveals that fuzzy logic offers great potential for application to collaborative decision-making. This thesis describes a Web-based collaborative decision-making system for construction project teams using fuzzy logic. Fuzzy logic is applied to tackle uncertainties and imprecision during the decision-making process. The prototype system is designed as Web-based to cope with the difficulty in the case where project team members are geographically distributed and physical meetings are inconvenient/or expensive. The prototype was developed into a Web-based software using Java and allows a virtual meeting to be held within a construction project team via a client-server system. The prototype system also supports objectivity in group decision-making and the approach encapsulated in the prototype system can be used for generic decision-making scenarios. The system implementation revealed that collaborative decision-making within a virtual construction project team can be significantly enhanced by the use of a fuzzybased approach. A generic scenario and a construction scenario were used to evaluate the system and the evaluation confirmed that the system does proffer many benefits in facilitating collaborative decision-making in construction. It is concluded that the prototype decision-making system represents a unique and innovative approach to collaborative decision-making in construction project teams. It not only contributes to the implementation of concurrent engineering in construction, but also it represents a substantial advance over existing approaches

    The Perspectives of Students on the Lecturers’ Creativity: A Qualitative Analysis of the Data From Private Higher Educational Institutions in China

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    Private higher educational institutions (PHEIs) have always been an essential part of the education industry, and lecturers are a necessary driving force for development. However, there are few studies on lectures’ creativity in PHEIs. This study recruited 30 students to participate in a semi-structured interview based on the creativity component theory to explore the connotation and the influence factors of lectures’ creativity. By utilizing Nvivo12, it processed the data by performing the word frequency analysis, the correlation analysis, and the hierarchical analysis. It proposes a conceptual framework related to lecturers’ creativity. The research revealed that the lecturers’ creativity contains domain-related and creation-related skills. The study demonstrates that students’ perception of lecturers’ creativity comes from teaching practice. Students can explain the composition of lecturers’ creativity from the part of domainrelated skills and creation-related skills. Furthermore, the research discovers that the creative and youth personality characteristics affect the lecturers’ creativity. Finally, it suggests that Chinese PHEIs should encourage lecturers to be more creative in teaching practice, an important strategic measure to strengthen the construction of lecturers and improve the competitiveness of the industry

    Perspectives on Open Educational Resources by University Students in Jiangxi Province of China: An Interview Analysis With UTAUT2 Model Framework

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    Open educational resources (OER) have become crucial for university students to explore as a shared digital resource. Although some accomplishments have been made in the research on OER adoption domestically and globally, there are three persistent limitations. It is limited from the perspective of university students, more focused on technology diffusion, university information system, digital library, high-quality course website, online learning, and mobile learning technology. Based on the grounded theory, this study took university students in Jiangxi province, China, as the research object to probe the phenomenon of adoption and use of OER. It preliminarily constructed the model of influencing the use of OERs by university students and initiated the application of the unified theory of acceptance and use of technology (UTAUT) model in a new field. The findings show that perceived value, perceived risk, facilitation conditions, social influence, habit, and hedonic motivation directly influence willingness to use. While facilitating needs and desire to use directly influence user behavior. It provides a new research idea and reference basis for educational management researchers to carry out similar related research in the future

    An Epidemiological Review of Diet and Cutaneous Malignant Melanoma

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    Incidence of cutaneous malignant melanoma has continued to rise despite public efforts to promote sun protection behaviors among populations at risk. However, dietary factors may also affect the development of melanoma. In the past few decades, findings from epidemiologic and experimental research have linked consumption of several foods and other nutrients to the risk of melanoma. Caffeine has been associated with a lower risk of melanoma, and citrus fruits and alcohol with increased risk. Associations between polyunsaturated fatty acid, niacin/nicotinamide, folate, and vitamin D with melanoma remain controversial. Diet likely influences melanoma development through several potential mechanisms, such as enhancing UV-induced apoptosis and increasing photosensitivity. We conducted a narrative review to summarize recent epidemiologic studies of diet and melanoma based on published literature. Given the high prevalence of the food items and nutrients covered in this review and the decades-long rising melanoma incidence worldwide, the associations we discuss may have important public health implications in terms of reducing melanoma incidence through dietary modification

    Specimen Orientation for the Calibration of Direct Scanning X-Ray Wood Densitometers

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    It was found that specimen orientation has considerable effect on the calibration of direct scanning X-ray wood densitometers. A comparison between various orientations was made and verified by a test. Optimum calibration is accomplished when the specimens are made in such a way that the radiation beam is passed through the wood in the tangential direction and scans it in the radial direction

    V2V Routing in VANET Based on Heuristic Q-Learning

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    Designing efficient routing algorithms in vehicular ad hoc networks (VANETs) plays an important role in the emerging intelligent transportation systems. In this paper, a routing algorithm based on the improved Q-learning is proposed for vehicle-to-vehicle (V2V) communications in VANETs. Firstly, a link maintenance time model is established, and the maintenance time is taken as an important parameter in the design of routing algorithm to ensure the reliability of each hop link. Aiming at the low efficiency and slow convergence of Q-learning, heuristic function and evaluation function are introduced to accelerate the update of Q-value of current optimal action, reduce unnecessary exploration, accelerate the convergence speed of Q-learning process and improve learning efficiency. The learning task is dispersed in each vehicle node in the new routing algorithm and it maintains the reliable routing path by periodically exchanging beacon information with surrounding nodes, guides the node’s forwarding action by combining the delay information between nodes to improve the efficiency of data forwarding. The performance of the algorithm is evaluated by NS2 simulator. The results show that the algorithm has a good effect on the package delivery rate and end-to-end delay

    Complementary stabilization by core/sheath carbon nanofibers/spongy carbon on submicron tin oxide particles as anode for lithium-ion batteries

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    To limit the pulverization of tin-based anode materials during lithiation/delithiation, submicron tin oxide/tin particles are fixed on core/sheath carbon nanofiber/spongy carbon via hydrothermal and carbothermal reduction treatment in this work. During carbothermal reduction, SnO2 nanosheets are converted to spherical Sn submicron particles and simultaneously the hollow spongy carbon is produced and still enwrap on carbon nanofiber. The as-produced flexible film is used for a binder-free anode for lithium ion batteries, without the polymer binder and conductive carbon. At 0.1, 0.5, 1 and 2 A g-1, the composite electrode respectively displays a discharging capacity of 1393.0, 738.2, 583.6 and 382.6 mAh g-1. Moreover, it delivers specific capacity of 726.9 mAh g-1 and coulombic efficiency of 99.45 % after 300 cycles at 0.1 A g-1. The comparison sample of carbon nanofiber/SnOx film without the presence of spongy carbon displays much lower rate performance and worse cyclic performance. The integrated structure of carbon nanofiber/SnOx/spongy carbon results in the remarkable Li-storage performance, in which the carbon nanofiber and spongy carbon synergistically provide conductive channel and buffer zone to hinder the pulverization and peeling of SnOx particles during charging-discharging processes

    Virtual Enterprises Risk Management DSS under Electronic Commerce

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    Risk management is important to the development of enterprise as well as social-economic prosperity. Virtual enterprise is the potential mode of future enterprise under electronic commerce environment and the risk management for it is a popular research area recently. Due to the complexity of its risk management a decision support system (DSS) with 3-bases-1-cell structure was designed. By coordinating data base, model base, algorithm base and dialogue cell, the functions of project management, risk identification, risk assessment, risk evaluation and risk programming was supported. The user-friendly system has such main characteristics as generality for verity virtual enterprise as well as different projects and the flexibility of model and algorithm, ensuring a standardized, scientific and informational risk management for virtual enterprises
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