Key Engineering Materials Vols. 480-481

Abstract: This study focuses on the indoor location system based on radio fingerprinting, and a grid positioning method based on weighted Euclidean distance matching by RSSI statistic parameters is presented in this paper. We analyze the principle of location fingerprint system and study the signal intensity distribution characteristics in indoor environment. According to the unsteadiness problem of the indoor signal strength caused by environmental impact, the positioning parameter model based on distributed grid is given. Moreover, the grid matching location algorithm is put forward based on the RSSI statistic parameters fusion estimation. Attributed to the proposed two-dimensional grid model, the algorithm is fit for the rapid matching calculations in continuous positioning case. Simulation results show that the approach has better robustness and accuracy, and it can effectively solve the problem of location estimates stability in general RSSI location fingerprinting system.

Abstract: An improved ant colony optimization is presented for solving subset problem by using k-nearest neighbor, which is used to reconfigure shipboard power system. Reconfiguration is considered as a typical subset problem, a mathematic model is built to solve it. K-nearest neighbor method is used to decrease the space of solutions and improve efficiency. The result of simulation shows that the improved algorithm can reconfigure shipboard power system efficiently.

Abstract: It proposes the decision module which based on the combination of polychromatic set and hybrid particle swarm algorithm. It uses polychromatic set theory to carry on partition to the shelves; the partition of each row of shelves is the same and the number of partitions is the same as the number of type of goods, then it uses particle swarm algorithm to determine the warehousing quantity of each kind of goods in each row of shelves, and finally in each row of shelves, according to the types and quantities of inbound goods, it uses hybrid particle swarm algorithm to carry on specific allocation to warehousing storage space in the corresponding regions, solves the problem of storage location assignment’s optimization, and proves this module’s feasibility and effectiveness through examples.

Abstract: In recent years, in order to reduce building energy consumption in China, and vigorously promote the development of ecological construction, the paper studies disadvantages of the cost of traditional project management applications in the ecological construction projects, exploring specific cost management adapt to the ecological construction project.

Abstract: A food safety testing instrument is designed and developed based microcontroller. The instrument includes optical unit, conditioning unit and control and acquisition unit. The optical unit converts the chemiluminescence signals into electrical signals through photoelectric sensor. Conditioning circuit mainly amplifies the weak signal to an appropriate range. Control and data acquisition circuit consists of the MCU, LCD and memory circuit. The experiment shows that the correlation coefficient (R2) between the phosphate ion concentration and emitting area was 0.98. The instrument is small，cheap and reliable. It shows that the instrument can successfully used to quick measurement for food safety in field.

Abstract: A new Region-based GAC (geodesic active contour) model was presented, which is the improvement of traditional GAC model. A new region-based signed pressure forces function was presented, which takes the place of the edge stopping function, and can efficiently solve the problem of segmentation of objects with weak edges or without edges. The model is implemented by level set method with a binary level set function to reduce the expensive computational cost of re-initialization of the traditional level set function. The proposed algorithm has been applied to images of different modalities with promising results, which are better than that of traditional GAC model and C-V model.

Abstract: Maintenance intervals and the optimal number of maintenance N*of NC machine tools in infinite time horizon are presented using a hybrid sequential imperfect preventive maintenance (PM) model. The failures of NC machine tools are described using Weibull process. Sensitivity analysis of cost parameters is given to show how the optimal results depend on the different cost parameters. The results show that when the shape parameter β of Weibull process within the range of [1.1,1.3], N* is slightly affected by β and cost ratio cr /cp. However, when the value of β is greater than 1.4, the effect of β and cr /cp to N* is significance. If an equipment is in wear later stage or PM actions are not too effective to it, it is not suitable to add the number of maintenance.

Abstract: Evacuation is a process in which threatened people are displaced from dangerous places to safer places in order to reduce the health and life vulnerability of affected people. Constructing typhoon emergency shelters is one of the ways to improve the areas anti-disaster capacity. There are many questions in emigration resettlement work. Such as: the layout of the resettlement places unreasonable, the fixed resettlement is insufficient, temporary resettlement site lacks the necessary living facilities and so on. Planning and construction of emergency shelters is a systematic project, which needs scientific and rational design. This paper proposed a mathematical model applied to the location selection, a solution of genetic algorithm was suggested. Then bring forward a decision-making model for the location-choosing of urgency response system and carried out the design procedure of genetic algorithm to finalize the optimized combination plan.

Abstract: The concept and contents of green leather shoes are analyzed in this paper. It is introduced mainly how to practice green technology in the life cycle of leather shoes to achieve green manufacturing, including green design, green production, green packaging, green use and green recycling and disposal. Green technology theory of shoes is continuously developing. It needs enterprises, research institutes and government departments to work together for green design and manufacturing of leather shoes to achieve a breakthrough in the theory and practice and promote shoes manufacturing go on the green road as soon as possible.

Abstract: The coupling performance of tool system is the important factor for the machining quality of high speed machining. Based on the deformation of contact surfaces of HSK tool system, the paper makes the academic analysis by elasticity theory and finite element simulation to high speed spindle/tool shank coupling system. The property of the contact stress and the radial deformation as well as the torsional stiffness with different amount of interference has been analyzed. In this method, the paper brings forward how the amount of interference will affect the coupling performance. Thus, it will give academic evidence to design and select tool system in the process of high speed machining.