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195 results about "Pre and post" patented technology

PRE and POST-conditions provide a set of conditions (a contract) for the programmer of the operation to meet. PRE and POST-conditions also help the reader and user to know what they can expect as the result of the operation upon the data structure.

Novel Karaoke and Multi-Channel Data Recording / Transmission Techniques via Wavefront Multiplexing and Demultiplexing

An advanced channel storage and retrieving system is achieved that is capable of simultaneously transporting multiple-stream data concurrently, with encryptions and error detection and limited correction capability using wavefront (WF) multiplexing (muxing) at the pre-processing and WF demultiplexing (de-muxing) in the post-processing. The WF muxing and demuxing processing can be applied for multiple signal streams with similar contents and format such as cable TV delivery systems or multiple signal streams with very distinct contents and format such as Karaoke multimedia systems. The stored or transported data are preprocessed by a WF muxing processor and are in the formats of multiple sub-channels. Signals in each sub-channel are results of unique linear combination of all the input signals streams. Conversely, an input signal stream is replicated and appears on all the sub-channels. Furthermore the replicated streams in various sub-channels are “linked” together by a unique phase weighting vector, which is called “wavefront” or WF. Various input signal streams will feature different WFs among their replicated signal streams in the sub-channels. The WF muxing processing is capable to generating a set of orthogonal WFs, and the WF demuxing processing is capable of reconstituting the input signal streams based on the retrieved sub-channel data only if the orthogonal characteristics of a set of WFs are preserved. Without the orthogonality among the WF, the signals in sub-channels are mixed and become effectively pseudo random noise. Therefore, an electronic locking mechanism in the preprocessing is implemented to make the WFs un-orthogonal among one another. Similarly, an electronic un-locking mechanism in the post-processing is implemented to restore the orthogonal characteristics among various WFs embedded in the sub-channel signals. Some of the phenomena due to the selected locking mechanisms are reproducible in nature, such as wave propagating effects, and other are distinctively man-made; such as switching sub-channel sequences. There are other conventional encryption techniques using public and private keys which can be applied in conjunction with the WF muxing and de-muxing processor, converting plain data streams into ciphered data streams which can be decoded back into the original plain data streams. An encryption algorithm along with a key is used in the encryption and decryption of data. As to the optional parallel to serial and serial to parallel conversions in the pre and post processing, respectively, we assume that transmissions with single carrier are more efficient than those with multiple carriers. We also assume single channel recording is more cost effective than multiple channel recording. However, there are occasions that continuous spectrum is hard to come-by. We may use fragmented spectrum for transmissions. There are techniques to convert wideband waveforms using continuous spectra into multiple fragmented sub-channels distributed on non-continuous frequency slots. Under these conditions we may replace the parallel to serial conversion processing by a frequency mapping processor.
Owner:SPATIAL DIGITAL SYST

Magnetic control rotating arc sensing real-time weld joint tracking system and method

The invention belongs to the technical field of welding automatic control, and particularly relates to a magnetic control rotating arc sensing real-time weld joint tracking system and a magnetic control rotating arc sensing real-time weld joint tracking method. The technical point is that a magnetic control rotating arc sensor is applied to automatically tracking a weld joint; a rotating magnetic field is exerted to the welding arc, so that the weld joint can be scanned through the welding arc at a certain frequency, and then the characteristic parameter for showing the position of a weld gun relative to the position of the weld joint can be acquired; a hall sensor is used for acquiring a welding current signal, and the welding current signal is fed into a control system to be subjected to digital filter and corresponding program operation; and a tracking performing mechanism is controlled to properly adjust the weld gun, therefore, the weld gun can be aligned to the center of the weld joint so as to track the weld joint. With the adoption of the system and the method, the requirement on automatic tracking of the weld joint can be met; the weld gun is directly arranged on the magnetic control rotating arc sensor, and the problem due to front installing and rear installing can be avoided; and the system and the method have the characteristics of being good in real-time capability, low in cost, high in stability and high in precision.
Owner:XIANGTAN UNIV

Real time technique for tracking weld joints of gas metal arc welding by magnetic controlled electric arc sensor

The invention discloses a real-time follow-up technique of a magnetic controlling arc sensing welding line of gas metal arc welding, which belongs to a welding control technique. The invention mainly solves the problems of complex structure, high cost, unstable performance and poor real-time performance, etc, of the prior gas metal arc welding line follow-up system. The invention adopts the technical proposal that the real-time follow-up technique comprises a magnetic controlling voltaic arc sensor, a welding system composed of a welding torch, a welding electric source and so on, a control system, a follow-up actuating mechanism composed of a set of cross sliding guides, a wheel robots and so on; wherein, the magnetic controlling voltaic arc sensor is directly installed on the welding torch, which is used for gas metal-arc welding process, to collect the horizontal and the vertical deviation signals of the welding line; the processed signals are input in a microcomputer for processing by software; the real-time control follow-up actuating mechanism is capable of automatically following up the welding line. The technique achieves automatic following up of the welding line in gas metal arc welding. The magnetic controlling arc sensor is installed on the welding torch used for gas metal-arc welding process, which eliminates the problems of preposing and postposing, and has the characteristics of good real-time performance, low cost, high stable performance and high precision.
Owner:XIANGTAN UNIV

Photographing method and mobile terminal

The invention relates to the technical field of communication, and provides a photographing method and a mobile terminal. By the aid of the photographing method and the mobile terminal, the problem oftedious operation in synthesized image generation procedures can be solved. The photographing method includes receiving first input of users under the condition of a state that shooting preview interfaces are displayed on current interfaces; updating the shooting preview interfaces to display first child preview interfaces and second child preview interfaces in response to the first input; receiving second input of the users; allowing first shooting identification displayed in the first child preview interfaces and second shooting identification displayed in the second child preview interfaces to move under the control in response to the second input; acquiring first images and second images by the aid of a front camera and a rear camera under the control under the condition that the first shooting identification and the second shooting identification are overlapped, and displaying synthesized images of the first images and the second images. The photographing method and mobile terminal have the advantages that every two corresponding images shot by the aid of the front camera and the rear camera can be synthesized to obtain the single corresponding image by the mobile terminal when the first shooting identification and the second shooting identification have overlapped regions, and synthesized image generation procedures are easy to operate.
Owner:VIVO MOBILE COMM CO LTD

Method for rapidly replacing tundish in molten steel continuous casting process

InactiveCN106216622AIncrease success rateStop shrinking too fastSlagMolten steel
The invention discloses a method for rapidly replacing a tundish in the molten steel continuous casting process. After pouring stopping of a crystallizer, heating type protection slag is rapidly laid and scattered on the molten steel liquid level in the crystallizer, the aluminum component is rapidly oxidized, a proper amount of heat is released, heating and heat preservation are conducted on molten steel in the crystallizer, crusting and excessively fast blank shell shrinkage due to temperature reduction of the molten steel liquid level are effectively prevented, an immersed water gap in a new tundish can be smoothly inserted in the molten steel in the crystallizer, and the rapid replacing success rate of the tundish is increased. By means of the method, rapid tundish replacing can be conducted when the molten steel liquid level in the crystallizer is high, the molten steel liquid level in the crystallizer is not obviously changed all the time in the whole tundish replacing process, the situation that when the tundish is replaced at the low liquid level, the huge rising and falling changes happen to the molten steel liquid level in the crystallizer is avoided, and the continuous casting stability and pre-and-post consistency of the cast blank quality before temporary pouring stopping and after pouring starting is conducted again are guaranteed.
Owner:SHANDONG IRON & STEEL CO LTD
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