Abstract: The invention relates to a method for preventing TCP SYN package flood attack, and belongs to the computer network security field. First, the firewall receives a client a TCP SYN connection request package, and responses, as an agent of the server, an acknowledgement of the TCP SYN connection request package with zero window size to the client. Then, the firewall records information about the TCP SYN connection request package and checks whether the connection request is legal. When the firewall has received a TCP SYN response package from the server, it returns an acknowledgement of said TCP SYN response package. At the same time, the firewall, as an agent of the server, sends an acknowledgement packet with nonzero window size to the client for initiating data transmission from the client. After that, data packets are transferred between the client and the server forwarded by the firewall as an agent.

Abstract: A tool for measuring depths of countersunk holes includes a worktable (1), a measuring member (30), and a display device (50). The worktable includes a measuring plate (10) defining four adjusting screw holes (17) in four comers thereof, and four adjusting rods (28) adjustably attached in the adjusting screw holes below the measuring plate. The adjusting rods are adjusted so that the measuring plate can be level. The measuring member is generally cylindrical, and includes a cylindrical head (32) having a conical tip (34). The display device includes a vertical central shaft (58), and a bearing sleeve (60) surrounding a bottom of the central shaft. The central shaft can move vertically through the bearing sleeve. The display device further includes a cylindrical body (52) having a display (54) showing a height value of a top face of the central shaft, and a zeroing button (56).

Abstract: A tool for measuring depths of countersunk holes includes a worktable (1), a measuring member (30), and a display device (50). The worktable includes a measuring plate (10) defining four adjusting screw holes (17) in four corners thereof, and four adjusting rods (28) adjustably attached in the adjusting screw holes below the measuring plate. The adjusting rods are adjusted so that the measuring plate can be level. The measuring member is generally cylindrical, and includes a cylindrical head (32) having a conical tip (34). The display device includes a vertical central shaft (58), and a bearing sleeve (60) surrounding a bottom of the central shaft. The central shaft can move vertically through the bearing sleeve. The display device further includes a cylindrical body (52) having a display (54) showing a height value of a top face of the central shaft, and a zeroing button (56).

Abstract: A functional material-composite structural magnetic core is the magnetic core mainly consisting of magnetic material and having regular geometric form. It includes a box with a slot cavity and through hole. The inner magnetic core is installed inside the cavity of the box. It is characterized by: there are multiple inter-layers inside of the cavity of the slot. The inter-layers divide the slot cavity into the multiple continued ring slot and inside the ring slot many inner magnetic cores are installed respectively. The advantages are: wide application frequency band, large application temperature range, expanded electromagnetic compatibility. The continued stability and sudden change of the electromagnetic characteristics can meet requirements of the electronic technology. The sensing and sending of power transferred signal and control of noise wave etc. showed its composite excellent performance, corresponding and matching characteristics.

Abstract: A polymeric low dielectric constant solution includes a low dielectric constant polymer dissolved in an aromatic aliphatic ether solvent. The polymer preferably is a poly(arylene ether) and the solvent preferably is anisole, methylanisole, phenetole or mixtures thereof. A process for forming a dielectric film on a substrate by spin-coating the polymeric solution is also provided.

Abstract: A method of forming an air gap or gaps within solid structures and specifically semiconductor structures to reduce capacitive coupling between electrical elements such as metal lines, wherein a norbornene-type polymer is used as a sacrificial material to occupy a closed interior volume in a semiconductor structure. The sacrificial material is caused to decompose into one or more gaseous decomposition products which are removed, preferably by diffusion, through an overcoat layer. The decomposition of the sacrificial material leaves an air gap or gaps at the closed interior volume previously occupied by the norbornene-type polymer. The air gaps may be disposed between electrical leads to minimize capacitive coupling therebetween.

Abstract: An improved technique for monitoring computer processes and their attributes using a three-dimensional graphical image. The three dimensional graphical image is formed by displaying the graphical objects associated with the computer processes and their attributes. The physical relationship between the various graphical objects within the graphical image preferably model the actual relationships between the processes and their attributes. The computers which run or activate the processes may also be represented by a graphical object within the graphical image. As the attributes of the computer processes change, the characteristics of the graphical objects are quickly adjusted and the three-dimensional graphical image is updated to reflect the changes to the attributes of the computer processes being monitored.