Advanced Materials Research Vols. 139-141

Abstract: This paper deals with an optimal method for solving a 2-stage flexible flow shop scheduling problem with group constraint, batch released dates. This problem is known to be NP-hard. In this paper, first of all, we construct a mathematical model for the problem. Then, we develop a branch and bound method with heuristic algorithm for the optimal solution of the problem. During the initialization, we use a heuristic algorithm H’ as the initial solution. We propose two branching algorithms in the branching procedure and two algorithms for the lower bound. We also propose a set of instances for this type of problem. The results are shown that our branch and bound method is effective for small and medium-sized problem but large-sized problem.

Abstract: Use of digitization clothing technology, the customer demand information flow of mass customization for clothing industry was analyzed. The mathematical mapping ways which can be identified by system from these demands were proposed. Combination with three specific process of customization, design, production of mass customization for clothing industry, the information conversion technologies were studied, respectively, from customer demand to orders, from orders to design program ,and from design program to clothing . The customization system configuration in the clothing industry was designed on the basis of Web. The information conversion and systems integration were achieved by PDM.

Abstract: Most of present product module partition methods are based on product function partition and use fuzzy clustering algorithm, but these methods are not only complex in implementation but also difficult to meet the requirements of product development oriented to product lifecycle. By analyzing interactive effects of product components in product lifecycle, a new method for product module partition is put forward. Firstly, LSSVC which has fast calculation speed and high accuracy is used to illustrate the generating process of modules, so several module partition schemes are obtained. Secondly, module partition schemes which are got by LSSVC and other methods of module partition are evaluated to get the most reasonable module partition scheme. Finally, widely-used speed reducer as an example is provided to illustrate the validity and rationality of the proposed approach.

Abstract: This paper firstly discussed the definition of knowledge integration in the field of product development and proposed the multidimensional knowledge integration model which could be the guidance during the implementation of knowledge integration. Subsequently the framework of knowledge integration is presented, three layer (the enterprise distributes resources layer, enterprise managed knowledge layer and product development process layer) in the framework are explanted respectively. The ontology is introduced to provide the semantic fundament for the framework. The structure of integrative ontology is studied and constructed with OWL(Ontology Web Language). The ontology plays an important role in knowledge organization and knowledge service and it’s the core part of the whole framework. At last a prototype system based on the previous techniques is developed and basically fulfills knowledge integration in product development process.

Abstract: Single-wall carbon nanotubes are candidates for a number of building blocks in nanoscale electronics. With respect to the assembly of carbon nanotube field effect transistor, the dielectrophoresis technology is adopted, which assembles SWCNTs between the micro-electrodes, SWCNTs are affected by the electrophoretic force which is carried out by the related theoretical analysis in a nonuniform electric field. The driving electric field of dielectrophoresis is simulated by the comsol software. According to the simulation results, a number of the experiments are done. It turns out that the required experimental parameters of the efficient assembly of SWCNT were obtained. AFM scanning and electrical properties of SWCNTs show that the method can achieve the effective assembly of carbon nanotube field effect transistor. SWCNTs are driven in the microelectrode gap, having a good arrangement of uniform orientation and assembly results, and proportional to the arrangement density along the electrode width direction and the duration of DEP. Meanwhile, it also provides an effective method of assembly and manufacture for other one-dimensional nanomaterials assembly of nanoelectronic devices.

Abstract: An novel optical nano biosensor based on gold capped nano-particles for detecting binding events between ligands and receptor molecules as well as interactions among proteins without use of labels has been presented in this paper. The optical properties of nano-sized gold particles exhibiting pronounced adsorption in the visible region which called as localized surface plasmon resonance (LSPR) have been exploited, whose peak wavelengths depended exquisitely on the refractive index of the surrounding. In comparison with surface plasmon resonance (SPR) technology, the optical nano biosensor possessed high sensitivity, surprisingly low “bulk effect”, ease of preparation, and low-cost polymer based fabrication, which opened a promising bioanalytical application in practice.

Abstract: Due to its inherent simplicity and low cost, the popularity of nanoimprint lithography is rising, and is positioned to succeed EUV as the most popular choice for next-generation lithography. This paper presents a homemade nanoimprint lithography prototype tool with a high precision alignment system, which adopts both macro and micro actuators to achieve coarse and fine alignment. Linear motors with 300 mm travel range and 0.1 µm step resolution, and piezoelectric translators with 50 µm travel range and 0.1 nm step resolution are used as macro and micro actuators, respectively. Imprint of 80nm width gratings with a 250 nm pitch is taken as an example to depict the process of NIL. High resolution and fine fidelity of the imprinted results demonstrate NIL’s promising candidate for next-generation lithography, and potential applications in manufacturing integrated circuits, optical, chemical, and biological nanostructures or micro-devices.

Abstract: Tradition lithographic techniques to produce micrlens array are complicated and time consuming. Due to the capability to replicate nanostructures repeatedly in a large area with high resolution and uniformity, hot embossing has been recognized as one of the promising approaches to fabricate microlens array with high throughput and low cost. This paper introduces processes to realize fabricating microlens array in mass production by direct hot embossing on silicon substrate. The mold is fabricated by multi-photolithography and etching steps and polymethyl methacrylate (PMMA) is chosen as the resist. Processes include coating, heating, pressing, etc. Fidelity and optical performance of the embossed microlens array were measured. High fidelity and fine optical performance of the embossed microlens array demonstrate the possibility of hot embossing to fabricate microlens array in mass production.

Abstract: Resonant tunneling diode (RTD) is a bipolar negative resistance device with the features of high speed, high frequency, low voltage and power, has been proved to have mesopiezoresistive effect, and the current-voltage characteristics of RTD is a function of stress. In the paper, the mesopiezoresistive effect of resonant tunneling diodes and Coriollis effect are both used in the research of gyroscope, so a novel gyroscope structure is proposed. The feasible fabrication process is designed according to present process technology, and the gyroscope is fabricated by GaAs surface micromachining processes and bulk micromachining technology. By the driven experiment it is verify that the gyroscope can be successfully driven. And the range of fabricated gyroscope natural frequency is also obtained, which is larger than 4KHz.

Abstract: Referring to the natures of nonlinear dynamics and coupled energy domains presented by Micro-Electro-Mechanical Systems (MEMS), a multi energy domain unified simulation language (modelica) based coupled modeling and simulation methodology is put forward. Then by choosing a micro electro-thermal actuator as the example, corresponding multi energy domain unified modeling and simulation processes of such a coupled micro device, which covers mechanical energy domain, electric energy domain and thermal energy domain, show the efficiency and convenience of this advanced modeling method. At last, through simulation result comparison with device level FEA simulation result and experimental result, the maximum relative error between numerical calculation result and experimental result is less than 4.2%. It proves the accuracy of this system level simulation method.