32 results about "Dynamic Data Exchange" patented technology

A method for realizing dynamic encryption of a communication channel between a server and a client, the method comprising: establishing a key storehouse at the server and the client respectively; The communication connection; the server decrypts and verifies the authentication information sent by the client when establishing communication; the server verifies and compares the client’s key store version number to determine whether to update the client’s key store; the server randomly assigns the second encryption The scheme encrypts the authentication information for the client to log in to the server; and the server randomly assigns a third encryption scheme to encrypt the communication data. Each data interaction of the communication channel dynamic encryption method of the present invention is encrypted. Before the server distributes the third encryption scheme, it only needs to transmit the encryption scheme instead of the specific key on the channel; communication data.

An embodiment of the present invention relates to an apparatus for managing an application program (AP) and a method therefor, and includes a processing module which, if the AP execution process thread corresponding to an AP to be terminated in a program block of an information processing device is terminated, reads the module information of each thread and the stack information of each module so as to select the module and stack having charge of processing a dynamic data exchange (DDE) message among each thread module and each module stack, and releases the termination of the thread including the selected module and stack. Thus, even in the state of terminating each AP execution process thread of the AP to be terminated (for example, user's unused AP), various problems due to the delay of processing the DDE message may be readily avoided.

The invention provides a query method for XML (Extensive Makeup Language) data. The query method comprises the following steps: (1) adopting a Native XML manner to store the XML data, wherein a storage structure comprises an inner node layer, a leaf node layer and an inverted layer, wherein the inner node layer is used for storing nodes of an XML tree, an XML element is encoded by adopting a DDE (Dynamic Data Exchange) encoding manner, the leaf node layer is used for storing file data of the nodes of the XML tree; the inverted layer is used for storing an inverted index of the leaf node layer; (2) taking out an element sequence corresponding to the nodes of an XPath from the inverted layer according to an input XPath query statement and carrying out merge sort by adopting a loser tree; and (3) carrying out pushing and popping operation on XML elements subjected to the merge sort according to the sequence and obtaining a query result from a buffering region. According to the query method for the XML data, the XPath with a keyword OR and a wildcard character * can be processed and the efficiency is very high.

The invention discloses a multifunctional frequency conversion central air-conditioning experimental platform, which comprises a refrigerating system, a control system and a simulated room, wherein the refrigerating system comprises a refrigerating unit, a chilled water system and a cooling water system; the control system comprises an upper computer, a lower computer and a frequency converter; amonitoring module in the upper computer is used for acquiring operating temperatures, pressure and flow signals of the experimental platform through the lower computer and transmitting a control command to monitor operation of the refrigerating system through the lower computer or the frequency converter; a matrix laboratory (MATLAB) module in the upper computer can execute an optimization control algorithm, and the MATLAB module and the monitoring module perform data exchange through a dynamic data exchange (DDE) mechanism or an object linking and embedding standard for process control (OPC); and the refrigerating unit comprises a frequency conversion compressor, a condenser, and an air-cooled evaporator and a water-cooled evaporator which are connected in parallel. By the experimental platform, refrigerating effects of the air-cooled evaporator, the water-cooled evaporator and a varied refrigerant volume (VRV) multi-air-conditioning system can be researched simultaneously, and a verification platform can be provided for a large frequency conversion central air conditioner to execute an energy-saving optimal advanced control strategy.

The invention discloses an on-line monitoring method of a numerical control system, comprising: S1, searching for variable data items, and verifying whether the ID of the variable data item exists in the numerical control system, and verifying the correctness of the ID if it exists; S2, from the numerical control system Obtain the variable data item whose ID exists and is correct; S3, calculate the precise time of obtaining the variable data item each time; S4, draw the curve of the obtained variable data item over time; S5, transfer the obtained variable data item to Stored in the table according to the sampling frequency. The online monitoring method of the numerical control system of the present invention collects numerical control machine tool data through the dynamic data exchange technology (DDE), can collect the processing process data efficiently in real time; can dynamically display the processing process signal during the data collection process, and is beneficial to monitor the processing trend in real time , to accurately control the real-time status of processing; by storing data in EXCEL according to the collection frequency, it can facilitate long-term data retention and further processing and analysis of data.