Accessibility analysis in manufacturing processes using visibility cones

Accessibility is a kind of important design feature of products,and accessibility analysis has been acknowledged as a powerful tool for solving computational manufacturing problems arising from different manufacturing processes.After exploring the relations among approachability,accessibility and visibility,a general method for accessibility analysis using visibility cones (VC) is proposed.With the definition of VC of a point,three kinds of visibility of a feature,namely complete visibility cone (CVC),partial visibility cone (PVC) and local visibility cone (LVC),are defined.A novel approach to computing VCs is formulated by identifying C-obstacles in the C-space,for which a general and efficient algorithm is proposed and implemented by making use of visibility culling.Lastly,we discuss briefly how to realize accessibility analysis in numerically controlled (NC) machining planning,coordinate measuring machines (CMMs) inspection planning and assembly sequence planning with the proposed methods.

Analysis and Evaluation of Red Resources in Shanghai Urban Area based on ArcGIS

Through extensive access to party history materials,combined with professional knowledge,the existing red resources in Shanghai are studied from multi-dimensional,multi-level and multi-integration perspectives,to learn party history from a new perspective.Through ArcGIS platform,the geographical distribution of red resources in Shanghai urban area is analyzed,and classification analysis,kernel density analysis and accessibility analysis are carried out according to resource types,grade of patriotism education base and grade of heritage preservation.The existing red resources in Shanghai urban area are evaluated,and the optimization suggestions are put forward.

Accessibility of Rural Tourism Projects in Wan’an County Based on Highway Network Data

Relying on the national rural revitalization policy and the policy of green rise of Jiangxi,the development of rural tourism in Wan’an County has ushered in new opportunities,and traffic accessibility is one of the important factors to be considered in rural tourism.Based on the accessibility evaluation method of the shortest travel time of highway traffic,this paper analyzes the accessibility of current tourism projects in Wan’an County.Research results show that;①the accessibility of rural tourism projects in Wan’an County is basically good except the Tianhu Mountain;②the accessibility of rural tourism projects in Wan’an County is strong in the north and weak in the south;③the transportation network serving the rural tourism in the north of Wan’an County is relatively perfect,while S221 Provincial Highway,Daqing-Guangzhou Expressway and Wan’an-Baoshan County Road play an important role in the rural tourism project in the south of Wan’an County.

Design of power balance SRAM for DPA-resistance

A power balance static random-access memory（SRAM） for resistance to differential power analysis（DPA） is proposed. In the proposed design, the switch power consumption and short-circuit power consumption are balanced by discharging and pre-charging the key nodes of the output circuit and adding an additional shortcircuit current path. Thus, the power consumption is constant in every read cycle. As a result, the DPA-resistant ability of the SRAM is improved. In 65 nm CMOS technology, the power balance SRAM is fully custom designed with a layout area of 5863.6 μm^2.The post-simulation results show that the normalized energy deviation（NED） and normalized standard deviation（NSD） are 0.099% and 0.04%, respectively. Compared to existing power balance circuits, the power balance ability of the proposed SRAM has improved 53%.