281 results about "Black hole" patented technology

Remote routers are configured to block the return path to malicious websites with the use of split tunneling while allowing paths to third party resource websites. The iBGP protocol runs on the agent's router, advertises routes and enables the head-end to set up a policy at each remote router. Enterprise policies for blocking access to “blackholed” website addresses are centrally administered but third party website traffic is not routed to the enterprise's network resources. Since remote offices may connect directly to third party websites, latency is minimized and network resources at the enterprise are not unduly burdened.

A system and method for aiding the handling of DDoS attacks in which VPN traffic entering an ISP network at some points will be black-holed, while VPN traffic entering the ISP network at other points will be routed, as it should be, to the system-under-attack. Thus, the system-under-attack is made available to some of the user community and made unavailable to suspect portions of the user community. Furthermore, the number of entry points where black-holing of VPN traffic occurs can be selected and changed in real-time during a DDoS attack.

The present invention provides a family of dark quenchers, termed Black Hole Quenchers (“BHQs”), that are efficient quenchers of excited state energy but which are themselves substantially non-fluorescent. Also provided are methods of using the BHQs, probes incorporating the BHQs and methods of using the probes.

The ultrasonic diagnostic system according to the present invention includes a kernel-data generating section for extracting first image data in a specified range set with reference to a specified pixel of a generated image data to generate kernel data, a pixel-value arranging section for modulating the values and arranging the values or the modulated values in descending order, a pixel-value selecting section for either selecting a pixel value in a specified rank or selecting a modulated pixel value in a specified rank and demodulating the modulated value, a characteristic determination section for determining the characteristic of the image from the pixel value of the first image data, and a second image-data generating section for selecting one of the value of a specified pixel in the first image data and the value in the specified rank or the demodulated value selected by the pixel selecting section to generate second image data. This allows reduction of black hole and highlighting of turbulent mosaic patterns without degradation in spatial resolution in an ultrasonic color Doppler method.

The invention relates to a detection and processing method and a system for botnet domain names. The detection and processing system is composed of an input module, an output module, a real-time calibration module and a processing module. The method comprises the step: 1) carrying out log query on a to-be-detected network domain name, and obtaining a log record of domain name query and inputting the log record to a detection port; 2) extracting and obtaining characteristics of the domain name according to the log record of the domain name query, and carrying out machine learning on the characteristics of the domain name; 3) after the machine learning, extracting the botnet domain names in a domain name on an outgoing line and/or a local domain name log; and 4) building a data base of the botnet domain names, carrying out breakdown through a black hole authoritative server, and finishing the processing. According to the detection and processing method and the system for the botnet domain names, while the botnet domain names can be extracted from a domain name server (DNS) to be broken down and separated so as to crack down botnet crimes, the botnet domain names are collected, and a network bad action that a botnet host is connected with a controlling end through the domain names so as to receive vicious commands is effectively prevented.

The invention discloses a double-layer-board sonic black hole vibration and noise reduction structure. The double-layer-board sonic black hole vibration and noise reduction structure is formed by combining two plate structures A1, wherein each plate structure A1 comprises a uniform area and a sonic black hole area connected with the uniform area, after the two plate structures A1 are placed together vertically, the sonic black hole areas are assembled to form a cavity area, and the cavity area is filled with a damping material and a sound absorption material. According to the double-layer-board sonic black hole vibration and noise reduction structure, the intrinsic material of the plate structures is removed, the high-efficiency energy absorption or vibration and noise reduction can be realized by combining with a small amount of damping material and sound absorption material, wherein the damping material consumes the most bending wave energy, so that the purpose of energy absorption or vibration control is achieved, the sound absorption material dissipates the transmitted energy, and thus the purpose of efficient energy absorption or vibration and noise reduction is achieved.

In an IP network during a DDoS attack on a website or other internet entity having an IP address, selective black-holing of attack traffic is performed such that some of the traffic destined for the IP address under attack continues to go to the IP address under attack while other traffic, destined for the same IP address is, rerouted via BGP sessions to a black-hole router. Such a selective black-holing scheme can be used to allow some traffic to continue in route to the IP address under attack, while other traffic is diverted.

The invention relates to an adaptive segmentally controlled tunnel illumination control system and method; the system comprises a tunnel illumination controller, a signal detection unit, a Zigbee network unit, and a plurality of illumination lamp sets; the signal detection unit comprises a vehicle sensor, a vehicle speed sensor, a brightness sensor, a temperature sensor, and a raindrop sensor; the Zigbee network unit comprises Zigbee main node module connected with the tunnel illumination controller, and a plurality of Zigbee node modules respectively connected with the illumination lamp sets; the illumination lamp sets comprise an introduction segment lamp set arranged outside the tunnel, an illumination lamp set arranged in the entrance segment in the tunnel, a transition segment illumination lamp set, a middle segment illumination lamp set, an exit segment illumination lamp set, and a road lamp illumination lamp set arranged outside the tunnel, and also comprise an emergency illumination lamp set. The adaptive segmentally controlled tunnel illumination control system can realize tunnel illumination, satisfies illumination curve demands of human eyes, thus eliminating black frame, black hole and white hole effects.

The invention discloses a system for automatically generating a document in the software development process. The system comprises a collection module, wherein the collection module is used for collecting the name of a module, and variables, methods and comments which are used by the module according to a software module. The system is characterized by also comprising a monitoring module and an output module, wherein the monitoring module is used for monitoring the change behavior of the software module; and the output module is used for outputting the name of the module, and the variables, the methods and the comments which are used by the module to form the document, and changing and revising the formed document according to a monitoring result of the monitoring module. By adoption of the system, the black hole phenomenon of projects can be avoided, and the implementation efficiency of the projects is improved; and the projects can be monitored in real time through the document, and a project progress document can be quickly generated.

A method and system for the policy-based restriction of electronic mail transmissions. A method for classifying electronic mail message transfer requests for policy enforcement can include identifying a source of an incoming electronic message, classifying the source, and applying a message transfer policy associated with the classification for the source. In particular, the identifying step can include identifying a network address for the source. The classifying step by comparison, can include classifying the source as one of a trusted source, a blocked source, and a suspect source. The classifying step also can include classifying the source as one of an authenticated source and an anonymous source. Finally, the classifying step further can include classifying the source as a blocked source where the source appears in a realtime black hole list.

In a preferred embodiment of the invention, a network client inserts a validation key into the SEQ and ACK fields of a TCP connection request (TCP-SYN). The TCP connection request is sent to a validating server. The validating server extracts the validation key and uses it, with other implicit and explicit data contained within the TCP connection request to validate the connection establishment request. If the connection request is validated, the validating server responds with a TCP-SYN/ACK as described in the TCP protocol specification. If the TCP connection request is denied, the request is discarded and nothing is sent back to the requestor, in this case the network client. When an internet port scanner sends a TCP connection request to a validating network server without the proper key, the request is silently discarded or “black-holed.” This makes the validating server appear to the Internet port scanner to not exist. The validating server has completely concealed itself from unauthorized and unvalidated connections.

The invention discloses a black hole solution and a preparation method thereof. The black hole solution comprises carbon nanotubes, a surface active agent, an alkaline matter and a proper amount of liquid solvent, wherein the carbon nanotubes are stably dispersed in the black hole solution under the action of a dispersant after being subjected to functionalization processing. The preparation method comprises the following steps: providing a carbon nanotube material; conducting functionalization processing for the carbon nanotube material; mixing the functionalized carbon nanotubes with the alkaline matter; adding the mixture into the liquid solvent to obtain a suspended solution; adding the surface active agent into the suspended solution; and mechanically agitating the suspended solution to obtain the black hole solution.

The invention discloses a WLAN equipment self-adaptive energy-saving method. The method comprises the steps of periodically maintaining neighbor information and load information of an AP (Access Point), and calculating the reverse neighbor number; periodically inspecting the load of the AP in the condition that coverage is satisfied, and self-adaptively closing the AP without user load; simultaneously covering signal black holes caused by the closing of the current AP by selfadaptively increasing the power of peripheral neighbor APs; periodically inspecting the load of the AP in the condition that coverage is satisfied, self-adaptively opening the AP closed for saving energy if the load exceeds a set threshold value, so as to improve the access performance; simultaneously reducing radio-frequency interference caused by the increasing of the AP by self-adaptively reducing the power of the peripheral neighbor APs. The method adjusts relevant AP power by self-adaptively closing part of AP power supplies or radio frequency functions in the condition that coverage is satisfied, and achieves the purpose of saving energy and reducing emission to the hilt.

The invention discloses a vibration damping and noise reduction device of an acoustic black hole. The vibration damping and noise reduction device comprises a disk-shaped structure whose distance between upper and lower surfaces is reduced gradually from the central axis to the external periphery, the disk-shaped structure comprises a block hole area, the distance between upper and lower surfacesof the black hole area is changed in the form of power exponent from the central axis to the external periphery, the disk-shaped structure is added to a noise reduced structure to carry out vibrationdamping and noise reduction on the noise reduced structure, the thickness of the noise reduced structure needs not to be reduced, and the noise reduced structure is avoided from locally high dynamic response or reduction of the structural intensity.

The invention discloses a protein complex recognizing method based on multi-source data fusion and multi-target optimization, comprising: preprocessing protein interaction network data to obtain adjacent matrixes; primarily clustering protein complexes to obtain an initial protein complex module; further optimizing the initial protein complex module, fusing topological structural features of the protein interaction network data and functional similar features of GO (gene ontology) annotation data during optimizing, and performing optimizing operation in conjunction with an adaptive multi-target blackhole optimization algorithm to obtain a more precise protein complex module; postprocessing to obtain a final optimal protein complex. The method of the invention has the advantages that protein complex recognition speed and precision are increased, the method is applicable to protein interaction networks and extensible to the analysis of other complex community networks, and the method isvery practical in complex network analysis.

A post treatment method and a device for colorful blood flow priority coding, relates to a general image data processing technique for a real-time colorful blood flow imaging system in medical field. The method comprises the following steps of: using the dilation operation and erosion operation of mathematical morphology, directly performing two-step non-linear filtration of the binary image outputted from the priority coding or simply accumulating the number of image elements of the colorful blood flow within a certain area; and confirming one point in the area as the image space of the blood flow or as image space of tissue, or as tissue image space. The binary image outputted from the priority coding obtained from the calculation realizes the filling of black hole and elimination of isolated point. The post treatment method and the device has the advantages that on the premise of increasing small cost, the invention realizes the flatness of colorful priority coding and keep the integrated shape of blood flow not changing so as to further improve the display appearance of the colorful blood flow.

A pair of IP communication devices (called a source device and a destination device) perform communication using IP packets (e.g., MAC frames or jumbo frames) over a communication path lying therebetween. The IP communication device checks whether or not the size of an MAC frame exceeds the maximum frame size that is determined in advance; then, an ICMP error is sent back to the source device having an IP address, which is included in a prescribed part of the MAC frame. The source device also executes path MTU discovery so as to determine an appropriate MTU, thus improving the communication efficiency without causing a black hole in communication.

A method, system, and computer program product for performing failover in a redundancy group, where the redundancy group comprises a plurality of routers including an active router and a standby router, the failover being characterized by zero black hole or significantly reduced black hole conditions versus a conventional failover system. The method comprises the steps of: receiving an incoming message at a switch; sending a request of identification to the plurality of routers to identify a current active router, where the current active router represents a virtual router of the redundancy group; and in response to receiving a reply containing an identification from the current active router within a predetermined time, forwarding the incoming message to the current active router.

The embodiment of the invention provides a method for defending challenge collapsar attack, which comprises the following steps: whether the WEB page requested by a client is a dynamic page is judged according to obtained data packets; if the WEB page requested by the client is a dynamic page, every client corresponds to a client request distrustful degree; and the dynamic page requests of the client is filtered according to the client request distrustful degree. In addition, the embodiment of the invention also provides a device for defending challenge collapsar attack. With the technical proposal of the embodiment of the invention, the challenge collapsar attack can be accurately identified, and corresponding defending measurements can be dynamically adopted to realize effective protection for a target host.

The invention discloses a no-distortion integrated imaging three-dimensional displaying method based on a Kinect sensor. The method comprises the steps of acquiring a depth image of a three-dimensional scene by means of the Kinect sensor, and performing black hole filling on the depth image obtained by the Kinect according to a rapid stepping method; performing combined bilateral filtering on the depth image after filling according to a corresponding colorful image, and obtaining the depth image with continuous depth change and smooth edge; and finally obtaining a primitive image array of a large-field-depth complex scene by means of an optical field model, thereby realizing no-distortion three-dimensional integrated imaging displaying. According to the primitive image array obtained through the method of the invention, because of an ideal state without influence by scattering and refraction, the image quality is better than that of the primitive image array which is obtained through a microlens array. The no-distortion integrated imaging three-dimensional displaying method can effectively overcome physical restriction of a micro-lens array in recording the large-field-depth scene and furthermore can realize no-distortion three-dimensional integrated imaging displaying for the large-field-depth compliex scene.

The invention discloses a method, a device and a system for detecting domain name system (DNS) black hole hijack. The method comprises the following steps of: capturing hyper text transfer protocol (HTTP) connection data packets corresponding to webpage access requests in a network, extracting domain names and Internet protocol (IP) addresses which correspond to webpages in the data packets, and recording the corresponding relationships between the domain names and the IP addresses; counting captured results, and acquiring the quantity of different domain names corresponding to the same IP address; determining IP addresses which are used for performing black hole hijack according to the quantity of the different domain names corresponding to the same IP address, and storing the IP addresses which are used for performing the DNS black hole hijack; when the webpage access request of a user generates the current HTTP connection data packet, extracting an IP address in the current HTTP connection data packet; and if the extracted IP address appears in the stored IP addresses which are used for performing the DNS black hole hijack, determining that the webpage access request is subjected to the DNS black hole hijack. By the method, the device and the system, the phenomenon that the user is disturbed by a DNS black hole hijack webpage is avoided.