Conceptual design plays an important role in product life cycle, which requires engineers to use sound design theory, cross-disciplinary knowledge, and complex technical support to acquire design concepts. However, the lack of sufficient computational tools makes it difficult for designers to fully explore in the wide design solution spaces. Therefore, this paper proposes an integrated cognitive computing approach to formalize the cognitive activities of conceptual design. A cognitive computing model composed of concept associative memory, concept generation, and decision-making process is established based on the integration of cognitive psychology and engineering design. First of all, the Hopfield neural network is used to acquire similar concept solutions for specific subfunctions from a knowledge base. Then, morphological matrix and genetic algorithm are introduced to produce a set of feasible candidate solutions in the concept generation process. Furthermore, a technique for order preference by similarity to an ideal solution is applied to evaluate the generated concept solutions and obtain the optimal solution automatically. Finally, a case study is given to demonstrate the effectiveness and efficiency of the proposed approach. 相似文献
The ultrasonic motor （USM） possesses heavy nonlinearities which vary with driving conditions and load-dependent characteristics such as the dead-zone. In this paper, an identification method for the rotary travelling-wave type ultrasonic motor （RTWUSM） with dead-zone is proposed based on a modified Hammerstein model structure. The driving voltage contributing effect on the nonlinearities of the RTWUSM was transformed to the change of dynamic parameters against the driving voltage. The dead-zone of the RTWUSM is identified based upon the above transformation. Experiment results showed good agreement between the output of the proposed model and actual measured output. 相似文献
Amidst increased research on mergers in higher education, studies addressing micro level processes are scarce and fragmented across disciplines: our aim is to systematically review existing studies, providing implications for research and practice. We grouped 21 studies from different countries under four themes: academic identity and self-image; cultural integration; staff reaction; teaching and research. Timing, status of institutions and staff, and disciplinary cultures apparently affect post-merger micro-level processes. Policy reforms might indirectly address micro-level processes following a merger, for example in a change of academic identities. Few studies investigated the impact of mergers on teaching and research activities. Studying merger consequences for academic core activities is complex, requiring a longer perspective involving students, staff and quantitative indicators. Longitudinal design in further studies might investigate changes from different angles and for different staff groups and students, exploring country differences in micro-level processes, applying a comparative design. Despite limitations, our review might inform the planning of merger processes regarding reactions at micro level.
Journal of Zhejiang University-SCIENCE B - Drug delivery with customized combinations of drugs, controllable drug dosage, and on-demand release kinetics is critical for personalized medicine. In... 相似文献
The changing and challenging conditions of the 21st century have been significantly impacting our economy, society and built and natural environments. Today generation of knowledge, mostly in the form of science, technology, engineering, mathematics, and arts, is seen as a panacea for the adaptation to changes and management of challenges. Making space and place that concentrate on knowledge generation, exchange, and marketing has become a priority for many nations. Consequently, the concept of knowledge city is coined at the beginning of the century and since then it is widely researched and practiced. This paper aims to scrutinise and provide a clear understanding on the evolution of knowledge city research and practice. As the methodological approach, the study employs systematic review of the knowledge city empirical studies in peer-reviewed journals. The findings shed light on the emerging patterns, identify research and practice gaps, and point out research directions to advance the field. 相似文献
