Abstract: A LED optical communication receiving lens includes a first surface and a second surface opposite to the first surface. The first surface includes a first spherical surface and a second spherical surface connected to the first spherical surface. The second surface includes a third spherical surface and a planar surface connected to the third spherical surface. A position of the LED optical communication receiving lens is defined as a three-dimensional Cartesian coordinate system (x, y, z). Sphere centers and symmetric central points of the first spherical surface, the second spherical surface, and the third spherical surface are located on the x axis. The first spherical surface and the planar surface are transmitted surfaces. The second spherical surface and the third spherical surface are reflective surfaces. The present application also relates to a LED optical communication system including the LED optical communication receiving lens.

Abstract: A methods and device for accessing virtual machine (VM) data are described. A computing device for accessing virtual machine comprises an access request process module, a data transfer proxy module and a virtual disk. The access request process module receives a data access request sent by a VM and adds the data access request to a request array. The data transfer proxy module obtains the data access request from the request array, maps the obtained data access request to a corresponding virtual storage unit, and maps the virtual storage unit to a corresponding physical storage unit of a distributed storage system. A corresponding data access operation may be performed based on a type of the data access request.

Abstract: A semiconductor structure and a method for manufacturing the same are provided. The semiconductor structure comprises a substrate, a through silicon via hole, an interlayer dielectric, a liner layer and a conductor. The through silicon via hole is formed in the substrate. The interlayer dielectric is formed on the substrate. The interlayer dielectric defines an opening corresponding to the through silicon via hole. The interlayer dielectric comprises a bird beak portion near the through silicon via hole. The liner layer is formed on a bottom and a sidewall of the through silicon via hole. The conductor is filled in the through silicon via hole and the opening.

Abstract: A methods and device for accessing virtual machine (VM) data are described. A computing device for accessing virtual machine comprises an access request process module, a data transfer proxy module and a virtual disk. The access request process module receives a data access request sent by a VM and adds the data access request to a request array. The data transfer proxy module obtains the data access request from the request array, maps the obtained data access request to a corresponding virtual storage unit, and maps the virtual storage unit to a corresponding physical storage unit of a distributed storage system. A corresponding data access operation may be performed based on a type of the data access request.

Abstract: A method for designing off-axial optical system with freeform surfaces is provided. An initial system is established. A freeform surface of the off-axial optical system that needs to be solved is defined as a freeform surface. A number of feature rays are selected. A number of intersections of the feature rays with the freeform surface are calculated point by point based on a given object-image relationship and a vector form of Snell's law. A number of first feature data points are obtained from the intersections and surface fitted to obtain the freeform surface. All the freeform surfaces of the off-axial optical system that need to be solved are obtained by the method above to form a before-iteration off-axial optical system. The before-iteration off-axial optical system is used as the initial system for multiple iterations to obtain an after-iteration off-axial optical system.

Abstract: A method for designing three-dimensional freeform surface is provided. An initial surface and a first three-dimensional rectangular coordinates system are established. A number of feature rays are selected. A number of intersections of the feature rays with a first freeform surface are calculated, wherein the intersections are a number of feature data points. The first freeform surface is obtained by surface fitting the feature data points. An equation of the first freeform surface includes a conic term and a freeform surface term. The first freeform surface is taken as the initial surface for an iteration process.

Abstract: A semiconductor structure and a method for manufacturing the same are provided. The semiconductor structure comprises a substrate, a through silicon via hole, an interlayer dielectric, a liner layer and a conductor. The through silicon via hole is formed in the substrate. The interlayer dielectric is formed on the substrate. The interlayer dielectric defines an opening corresponding to the through silicon via hole. The interlayer dielectric comprises a bird beak portion near the through silicon via hole. The liner layer is formed on a bottom and a sidewall of the through silicon via hole. The conductor is filled in the through silicon via hole and the opening.

Abstract: A LED optical communication receiving lens includes a first surface and a second surface opposite to the first surface. The first surface includes a first spherical surface and a second spherical surface connected to the first spherical surface. The second surface includes a third spherical surface and a planar surface connected to the third spherical surface. A position of the LED optical communication receiving lens is defined as a three-dimensional Cartesian coordinate system (x, y, z). Sphere centers and symmetric central points of the first spherical surface, the second spherical surface, and the third spherical surface are located on the x axis. The first spherical surface and the planar surface are transmitted surfaces. The second spherical surface and the third spherical surface are reflective surfaces. The present application also relates to a LED optical communication system including the LED optical communication receiving lens.

Abstract: A methods and device for accessing virtual machine (VM) data are described. A computing device for accessing virtual machine comprises an access request process module, a data transfer proxy module and a virtual disk. The access request process module receives a data access request sent by a VM and adds the data access request to a request array. The data transfer proxy module obtains the data access request from the request array, maps the obtained data access request to a corresponding virtual storage unit, and maps the virtual storage unit to a corresponding physical storage unit of a distributed storage system. A corresponding data access operation may be performed based on a type of the data access request.

Abstract: A design method of LED freeform surface illumination system based on XY-polynomial obtains a plurality of data points of a freeform surface, wherein each data point includes a coordinate value Qi and a normal vector Ni. A sum of squares e1(P) of coordinate differences in z direction between the coordinate value Qi and the freeform surface is applied, and by a sum of squares e2(P) between the normal vector Ni of the data points and normal vector ni of the freeform surface a modulus of vector differences is acquired. An evaluation function ƒ(p)=e1(P)+we2(P) is proposed and a plurality of freeform surface shapes obtained by selecting different weightings. The freeform surface shape which has the best imaging quality is achieved as a final shape, and a freeform surface lens based on the final shape is constructed to establish an LED freeform surface illumination system.

Abstract: A construction method of freeform surface shape based on XY-polynomial obtains a plurality of data points of a freeform surface according to an object point and an imaging point in a three-dimensional Cartesian coordinates system Oxyz. Each of the plurality of data points comprises a coordinate value Qi and a normal vector Ni. A first sum of squares e1(P) of coordinate differences in z direction between the coordinate value Qi and the freeform surface is applied, and by a second sum of squares e2(P) between the normal vector Ni of the data points and a normal vector ni of the freeform surface, a modulus of vector differences is acquired. An evaluation function ƒ(p)=e1(P)+we2(P) is proposed and a plurality of freeform surface shapes obtained by selecting and applying different weightings. A final freeform surface shape ?opt is chosen from the plurality of freeform surface shapes.

Abstract: An enclosure assembly includes a base, and a bracket. The base includes two side plates parallel to each other and two installation boards. Each of the two installation boards is attached to each of the two side plates and defining a pivot hole and a rotating slot. The bracket is configured to receive a plurality of data storage devices and includes a pivot post and a rotating post corresponding to each installation board. The pivot post is pivotably engaged in the pivot hole. The rotating post is engaged in the rotating slot and is rotatable about the pivot post relative to the base along the rotating slot, so that there is different angle defined between the bracket and the base.

Abstract: A bracket mechanism includes a tray, and a blocking member. The tray defines a receiving space configured to receive a first data storage device. The tray includes a first sidewall. The first sidewall defines an installation hole, and a latching member located in the first storage device is engaged in the installation hole. The blocking member is engaged with the first tray and includes a limiting piece, and the limiting piece is received in the installation hole and resists the latching member to prevent the latching member from moving in the installation hole relative to the first sidewall.

Abstract: An apparatus for securing an electronic device within a vehicle includes a retention base, a loading base, and a hinge assembly hinged between the retention base and the loading base. The loading base includes a retaining member. The retaining member includes a ring-shaped main body. The hinge assembly includes a pivoting shaft, a joining member assembled to the retention base, a hinge member, and a locking member. The joining member and the hinge member are sleeved around the pivoting shaft and assembled together by the locking member. The hinge member includes a hinging portion, a connecting portion connected to the hinging portion, and a rotation portion extending from the connecting portion away from the hinging portion. The hinging portion is rotatably received and latched in the main body. The rotation portion is rotatably sleeved around the pivoting shaft.

Abstract: A methods and device for accessing virtual machine (VM) data are described. A computing device for accessing virtual machine comprises an access request process module, a data transfer proxy module and a virtual disk. The access request process module receives a data access request sent by a VM and adds the data access request to a request array. The data transfer proxy module obtains the data access request from the request array, maps the obtained data access request to a corresponding virtual storage unit, and maps the virtual storage unit to a corresponding physical storage unit of a distributed storage system. A corresponding data access operation may be performed based on a type of the data access request.

Abstract: A method and apparatus for data processing. The method calculates correlations between a plurality of attributes in a dataset. The attributes are factors involved in transaction processing. The method generates a relationship graph by using the plurality of attributes and the correlations between the plurality of attributes; and extracts a sub-graph from the relationship graph to represent a hypothesis. The hypothesis describes the impacts of the factors on the transaction processing. Also provided is an apparatus for implementing the above data processing method.

Abstract: A methods and device for accessing virtual machine (VM) data are described. A computing device for accessing virtual machine comprises an access request process module, a data transfer proxy module and a virtual disk. The access request process module receives a data access request sent by a VM and adds the data access request to a request array. The data transfer proxy module obtains the data access request from the request array, maps the obtained data access request to a corresponding virtual storage unit, and maps the virtual storage unit to a corresponding physical storage unit of a distributed storage system. A corresponding data access operation may be performed based on a type of the data access request.

Abstract: An all-in-one device includes a rear panel, a mounting member, and handle. The mounting member is secured to the rear panel. The handle includes an actuating pole and two rotating arms located on the actuating pole. The two rotating arms are respectively connected to two opposite ends of the mounting member. The actuating pole abuts the rear panel and is rotatable away from the rear panel.

Abstract: A packing box can include a first cover, a second cover, a first sidewall, a second sidewall, a third sidewall, a fourth sidewall, and a bulkhead. The first cover and the second cover can be opposite to each other. The four sidewalls can be sequentially coupled end-to-end. The bulkhead can be received in the main box and be substantially parallel to the first cover and the second cover. Four edges of the bulkhead can be coupled to the four sidewalls, respectively. An inner receiving space of the main box can be divided into a first receiving cavity and a second receiving cavity by the bulkhead. A number of receiving portions can be defined on a surface of the packing box facing the first receiving cavity.

Abstract: A clock signal generating apparatus includes a first frequency generating circuit, a second frequency generating circuit, and an output circuit. The first frequency generating circuit is arranged to generate a first clock signal having a first oscillation frequency. The second frequency generating circuit is arranged to generate a second clock signal having a second oscillation frequency. The output circuit is arranged to receive the first and second clock signals. The output circuit is able to output one of the first and second clock signals as an output clock signal according to an oscillation frequency control setting provided by an external bounding pad included within the clock signal generating apparatus.