Abstract: Systems and methods for optimizing database routing in accordance with embodiments of the invention are illustrated. One embodiment includes a tiered database. The tiered database includes a data warehouse used to store obtained data. The tiered database includes a relational layer that stores a copy of a subset of the obtained data within a certain period of recency. The tiered database includes a query planner. The query planner is configured to receive a new query and determine a query plan to respond to the query. The query planner is configured to compute, from a set of database metrics and the preliminary query plan, a storage access cost. The query planner is configured to route the query based on the storage access cost, wherein the query is routed: to the data warehouse when the storage access cost exceeds a predetermined threshold; and to the relational layer otherwise.

Abstract: Disclosed are a narrow gap laser-TIG arc hybrid welding apparatus and method. The welding apparatus includes a welding gun body, a swing welding gun assembly, a welding wire feeding and heating assembly, and a gas conveying assembly; the swing welding gun assembly includes a welding gun rotating shaft, a stepper motor, a large gear, a pinion, an upper insulating sleeve, a lower insulating sleeve, a tungsten electrode clamp, and a tungsten electrode; the stepper motor is mounted on a motor connection seat; the pinion is mounted on the output shaft of the stepper motor; the large gear is mounted on the welding gun rotating shaft; the pinion is engaged with the large gear; the welding gun rotating shaft is mounted and positioned on the welding gun body; the tungsten electrode is mounted at the tail end of the welding gun rotating shaft by means of the tungsten electrode clamp.

Abstract: A streaming-based VR multi-split system and method are provided. The system includes a control system, a manipulation terminal and at least one experience terminal. The control system includes a streaming media server, a streaming coding and decoding interaction module and a VR platform. The streaming decoding and interaction processing module is configured to receive a video stream sent by the streaming coding and decoding interaction module, collect interaction data at one side of the manipulation terminal in real time, and transmit the interaction data to the streaming coding and decoding interaction module. The streaming coding and decoding interaction module sends a video picture code of the VR platform to the manipulation terminal, and pushes the video stream corresponding to the interaction data to the streaming media server. A presentation picture corresponding to an operation of the experience terminal is acquired by the streaming media server.

Abstract: A streaming-based VR multi-split system and method are provided. The system includes a control system, a manipulation terminal and at least one experience terminal. The control system includes a streaming media server, a streaming coding and decoding interaction module and a VR platform. The streaming decoding and interaction processing module is configured to receive a video stream sent by the streaming coding and decoding interaction module, collect interaction data at one side of the manipulation terminal in real time, and transmit the interaction data to the streaming coding and decoding interaction module. The streaming coding and decoding interaction module sends a video picture code of the VR platform to the manipulation terminal, and pushes the video stream corresponding to the interaction data to the streaming media server. A presentation picture corresponding to an operation of the experience terminal is acquired by the streaming media server.

Abstract: The present disclosure discloses a virtual cinema and an implementation method thereof. The implementation method of the virtual cinema comprises: arranging a virtual screen, and playing a video content thereon; and projecting ambient light varying with the video content around the virtual screen. By projecting ambient light varying with the video content around the virtual screen while displaying the video content to the user through the virtual screen, the sense of reality is enhanced, thereby solving the problem that the user experience is affected because the ambient light is not considered enough in the existed virtual cinema.

Abstract: A method and device of controlling a virtual mouse and a head-mounted displaying device are disclosed. The method of controlling a virtual mouse includes, but is not limited to utilizing a sensor provided in a head-mounted displaying device to gather a user's head motion data; calculating the gathered head motion data, to obtain a two-dimensional coordinate value in a coordinate system where the displaying screen of the head-mounted displaying device is located; and according to the two-dimensional coordinate value, controlling a virtual mouse of the head-mounted displaying device to perform a corresponding mouse moving operation on the displaying screen. The method directly controls the moving of a virtual mouse according to the user's head motion, and omits externally connected physical mice. Therefore the input control of the head-mounted displaying device is more precise, user operation is facilitated, and the usage experience is improved.

Abstract: Embodiments of the present disclosure disclose a head-wearable apparatus, a 3D video call system and a method for implementing 3D video call. The present disclosure relates to virtual reality technologies and is invented to relatively completely shoot video images of the scenario where the user locates, achieve real-time 3D video call between users of both parties, and mutually share scenes viewed by themselves. The head-wearable apparatus comprises at least two cameras which are spaced apart from each other and arranged on the head fixing means and/or the video output unit, and field of vision of the at least two cameras superimposes and covers all positions in a horizontal direction.

Abstract: A method and device of controlling a virtual mouse and a head-mounted displaying device are disclosed. The method of controlling a virtual mouse includes, but is not limited to utilizing a sensor provided in a head-mounted displaying device to gather a user's head motion data; calculating the gathered head motion data, to obtain a two-dimensional coordinate value in a coordinate system where the displaying screen of the head-mounted displaying device is located; and according to the two-dimensional coordinate value, controlling a virtual mouse of the head-mounted displaying device to perform a corresponding mouse moving operation on the displaying screen. The method directly controls the moving of a virtual mouse according to the user's head motion, and omits externally connected physical mice. Therefore the input control of the head-mounted displaying device is more precise, user operation is facilitated, and the usage experience is improved.

Abstract: The present disclosure discloses a virtual cinema and an implementation method thereof. The implementation method of the virtual cinema comprises: arranging a virtual screen, and playing a video content thereon; and projecting ambient light varying with the video content around the virtual screen. By projecting ambient light varying with the video content around the virtual screen while displaying the video content to the user through the virtual screen, the sense of reality is enhanced, thereby solving the problem that the user experience is affected because the ambient light is not considered enough in the existed virtual cinema.

Abstract: Embodiments of the present disclosure disclose a head-wearable apparatus, a 3D video call system and a method for implementing 3D video call. The present disclosure relates to virtual reality technologies and is invented to relatively completely shoot video images of the scenario where the user locates, achieve real-time 3D video call between users of both parties, and mutually share scenes viewed by themselves. The head-wearable apparatus comprises at least two cameras which are spaced apart from each other and arranged on the head fixing means and/or the video output unit, and field of vision of the at least two cameras superimposes and covers all positions in a horizontal direction.