申请/专利权人：
UNIV SOUTH CHINA TECHYANG ZHIMINTANG SHAOHUALU BORON
申请/专利号：
WO2009CN71094
申请时间：
2009-3-31
公开号：
WO2010094183(A1)
公开时间：
2010-8-26
摘要：
A group key management method based on an n-dimensional sphere is provided. After initialization, when new users join, the group manager accepts and numbers the new users; when users leave, the group manager deletes the confidential information of the leaving users. If there are users joining and leaving at the same time, the group manager deletes the confidential information of the leaving users, accepts the new users joining, numbers the new users and accepts the confidential information of the new users. The group manager then selects the mapping parameters, and maps the confidential information of each user in the group and of itself to their respective points in space; the sphere center composed by these points is computed, the center and the mapping parameters are published, and the numbers of any leaving users are published. The users in the group compute the corresponding points in space according to their own numbers, and then determine the group key. The present invention can efficiently decrease stored user information, the amount of calculations and messages when the key is updated, and keep the keys independent of each other.
摘要：
This invention has provided a direct manufacturing methodology of customized lingual orthodontic brackets by selective laser melting. The procedure is as follows. First of all, measure the dentition data and construct the 3D CAD model of the teeth through reverse engineering. Then a single soleplate of the lingual bracket contacting the tooth surface, as well as the ideal slot position is designed based on the teeth features. The designed models are later imported into the SLM machine and used to produce the brackets with desired materials directly. This method can actualize customized manufacture with highly accuracy, producing highly matched brackets all at once. The invention not only saves time and cost, but also has wide adaptation range and is able to adopt various raw materials. Different raw materials can be utilized in one step to accommodate specific capacity requirement of different parts of the brackets.
摘要：
An imaging apparatus (12) for fully automatic screen printer including two stacked light sources (6,7), two stacked beamsplitters (4,5), two stacked optical reflectors (1,2), two stacked imaging lenses (8,10) and two stacked image sensors (9,11), wherein the two stacked optical reflectors and the two stacked light sources are correspondingly disposed on two different sides of the two beamsplitters, the two stacked imaging lenses are disposed on another side of the beamsplitters different from that of the optical reflectors and the light sources, the two stacked image sensors are disposed behind the imaging lenses; the optical reflectors are provided with an upward reflection plane and a downward reflection plane, the optical axes of the imaging lenses are orthogonal to that of the light sources. The apparatus has two independent optical paths which capture the image of the printed circuit board and that of the screen respectively. Furthermore, the apparatus is of compact structure, high acquiring speed and optical paths are easily adjusted.
