92results about How to "Mitigate and obviate disadvantage" patented technology

The invention provides methods, apparatus and systems for detecting distributed denial of service (DDoS) attacks within the Internet by sampling packets at a point or points in Internet backbone connections to determine a packet metric parameter. The packet metric parameter which might comprise the volume of packets received is analysed over selected time intervals with respect to specified geographical locations in which the hosts transmitting the packets are located. The expected behaviour can be employed to identify traffic distortions revealing a DDoS attack. In a complementary aspect, the invention provides a method of authenticating packets at routers in order to elevate the QoS of authenticated packets. This method can be used to block or filter packets and can be used in conjunction with the DDoS attack detection system to defend against DDoS attacks within the Internet in a distributed manner.

A foldable knife includes a housing, a blade holder, a first pivot member, a second pivot member, and a control knob. Thus, the blade is folded into the opening of the housing when not in use, thereby preventing the blade from causing danger to the user. In addition, the blade holder is juxtaposed to the housing when being folded to largely reduce the volume of the foldable knife, thereby facilitating the user carrying the foldable knife.

A foldable bicycle includes a front fork, a head tube, a support tube, an adjusting member, two support levers, a rear fork, and a hydraulic cylinder. Thus, when the foldable bicycle is folded, the rear wheel is in parallel with the front wheel, so that the user can simultaneously draw the rear wheel and the front wheel to move easily and conveniently, thereby facilitating the user moving the folded bicycle. In addition, the foldable bicycle is folded easily and conveniently, thereby facilitating the user folding the bicycle.

A tool box includes a main body, and a plurality of juxtaposed receiving members each pivotally mounted in the main body for receiving a plurality of screwdriver tips. Thus, each of the screwdriver tips is locked on the respective receiving member efficiently by the clamping effect of the elastic press piece of each of the receiving members, thereby preventing each of the screwdriver tips from being detached from the tool box when not in use.

A ratchet wrench includes a handle, a drive head, a ratchet wheel, a pawl member, a control knob, a positioning plate, and an urging spring. Thus, the ratchet wrench includes a positioning plate to push the pawl member, thereby reducing the volume of the ratchet wrench efficiently. In addition, the urging spring is supported and guided by the guide shaft of the positioning plate, so that the positioning plate is not easily deformed, thereby facilitating movement of the urging spring in the positioning plate.

A pedal structure for a bicycle includes a pedal body, and an elastic clamping device. The elastic clamping device is mounted on each of the two opposite sides of the pedal body and includes a front binding plate, a rear binding plate, a pivot shaft, at least one torsion spring, an urging plate, and an adjusting bolt. Thus, the cleat can be mounted on and detached from the pedal body easily and conveniently, and can be clamped on the pedal body rigidly and stably by the elastic clamping force of the front binding plate and the rear binding plate.

An insulating screwdriver includes a handle, a drive shank having a first end mounted in the handle and a second end protruding outwardly from the handle, an insulating jacket mounted on the second end of the drive shank, and an identification insulating sleeve mounted between the second end of the drive shank and the insulating jacket. Thus, when the insulating jacket is worn out or broken due to friction or hit, the identification insulating sleeve is still located outside of the drive shank to provide a secondary insulating effect to the drive shank so as to protect the user when operating the drive shank.

A circular sawing machine includes a base, a saw seat movable relative to the base, and a link mechanism pivotally mounted between the base and the saw seat, so that the saw seat is linearly movable relative to the base. Thus, the link mechanism can absorb vibration or shock during operation of the circular saw blade so as to provide a shock-absorbing effect the circular saw blade, so that the circular saw blade can be operated smoothly and stably.

A computer housing includes a shell having a side opening, a first side wall and a second side wall, and a support bracket rotatably mounted on the shell and having a head portion, a tail portion, and a support portion. Thus, when the support bracket is rotatable to a closed position, the tail portion of the support bracket is rested on the second side wall of the shell, and the support portion of the support bracket is received in an inside of the shell, and when the support bracket is rotatable to an open position, the tail portion of the support bracket is detached from the second side wall of the shell, and the support portion of the support bracket is detached from the inside of the shell.

An exercising device includes a main frame, a pivot bar pivotally mounted on the main frame, a stop block mounted on the pivot bar and rested on the main frame when the main frame approaches the pivot bar, two rocking bars mounted on the main frame, and two elastic members each biased between the main frame and the pivot bar. Thus, the longitudinal bar of the main frame is rested on the stop block, thereby preventing the main frame from being entirely rested on the ground due to an excessive rotation, and preventing the user's back from being injured due to excessive bending so as to protect the user's safety.

A dusting brush includes a brush holder, a sliding sleeve slidably mounted on the brush holder, two symmetrical ornament shells mounted on the sliding sleeve to move therewith, and a plurality of bristles mounted on the brush holder. Thus, the dusting brush can be operated easily and conveniently, thereby facilitating the user operating the dusting brush. In addition, the bristles are fully hidden in the sliding sleeve when not in use, thereby enhancing the aesthetic quality of the dusting brush.

A circular saw includes a base, a saw arm, and an angle adjusting device. The angle adjusting device includes a rod unit, a first gear unit, a second gear unit, and a positioning unit. The rod unit includes an outer rod, and an inner rod. The first gear unit includes a first drive gear and a first driven gear. The second gear unit includes a second drive gear and a second driven gear. The positioning unit includes a mounting tube, and a positioning bolt. Thus, the inclined angle of the saw arm can be adjusted by the angle adjusting device easily and conveniently, thereby facilitating the user operating the circular saw.

A suspension rack includes a main board, at least one support seat detachably mounted on the main board and having a first plate formed with a plurality of limit slots and a second plate formed with a plurality of passages, and a plurality of screwdrivers each having a handle supported by the first plate, a reduced neck limited in a respective limit slot and a shank extended through a respective passage. Thus, the reduced neck of each of the screwdrivers is limited between the respective limit slot and the respective passage, so that each of the screwdrivers is limited by the support seat, thereby preventing each of the screwdrivers from being detached from the support seat freely so as to achieve a temporary anti-theft effect.

A ratchet wrench includes a handle, a drive head, a ratchet wheel, a pawl member, a control knob, a positioning plate, and an urging spring. Thus, the ratchet wrench includes a positioning plate to push the pawl member, thereby reducing the volume of the ratchet wrench efficiently. In addition, the urging spring is supported and guided by the guide shaft of the positioning plate, so that the positioning plate is not easily deformed, thereby facilitating movement of the urging spring in the positioning plate.

A clamping device includes two clamping members pivotally connected with each other and each having a first end and a second end, and a braking mechanism mounted between the second ends of the two clamping members to provide a stepless braking effect to the two clamping members. Thus, the braking mechanism provides a stepless braking effect to the two clamping members, so that the two clamping members are movable toward each other freely so as to shorten and adjust the open angle of the holding portion successively to hold a workpiece and are not movable outward relative each other to stop an outward movement of the two clamping members instantaneously so as to fix the holding portion to clamp the workpiece.

A connection device for a signal wire includes at least one electrically conducting plate, at least one first holding member mounted on a first side of the electrically conducting plate, at least one second holding member mounted on a second side of the electrically conducting plate, and at least one locking member extended through the first holding member, the electrically conducting plate and the second holding member to clamp the electrically conducting plate between the first holding member and the second holding member. Thus, the first holding member and the second holding member are mounted on and removed from the signal wire by tightening or loosening the locking member, so that the connection device is attached to and detached from the signal wire easily and rapidly.

A hub assembly for a disk brake of a bicycle includes a support shaft, a hub body pivotally mounted on the support shaft and provided with two drum disks, a mounting portion protruding from one of the drum disks, a threaded section protruding from the mounting portion, a brake disk resting on the end face of the mounting portion, and a chainwheel screwed onto the threaded section and pressing the brake disk so that the brake disk is clamped between the mounting portion and the chainwheel closely. Thus, the brake disk is mounted on and detached from the hub body by screwing and unscrewing the chainwheel, so that the hub assembly is assembled and disassembled easily and rapidly, thereby facilitating a user assembling and disassembling the hub assembly.

A string saw includes a housing, and an air box. The housing includes a first casing and a second casing combined with each other. The air box is mounted in the housing and has an inside formed with a receiving chamber communicating with the storage space of the first casing, so that the cut chips during the sawing process can be introduced from the storage space of the first casing into the receiving chamber of the air box. Thus, the string saw can provide the dust collection and chip drainage function.

A heat exchanging device is detachably mounted on a container or a cover. The cover is mounted on the container, thereby forming a closed space between the cover and the container. The heat exchanging device containing a temperature regulating medium is mounted in the closed space between the cover and the container. Thus, the heat exchanging device can be replaced easily and conveniently when being inoperative without having to move the food, thereby facilitating the user using the heat exchanging device, and thereby achieving the sanitary purpose.