An approach of defending against Distributed Denial of Service (DDoS) attack based on flow model and flow detection is presented. The proposed approach can protect targets from DDoS attacking, and allow targets to pro...An approach of defending against Distributed Denial of Service (DDoS) attack based on flow model and flow detection is presented. The proposed approach can protect targets from DDoS attacking, and allow targets to provide good service to legitimate traffic under DDoS attacking, with fast reaction. This approach adopts the technique of dynamic comb filter, yields a low level of false positives of less than 1.5%, drops similar percentage of good traffic, about 1%, and passes neglectable percentage of attack bandwidth to the victim, less than 1.5%. The prototype of commercial product, D-fighter, is developed by implementing this proposed approach on Intel network processor platform IXP1200.展开更多
LIU Jie still remembers the challenges she faced in the fight against the AIDS epidemic during her stint as a medical volunteer in Nigeria six years ago. Ironically, it was not the lack of medicine or funding that was...LIU Jie still remembers the challenges she faced in the fight against the AIDS epidemic during her stint as a medical volunteer in Nigeria six years ago. Ironically, it was not the lack of medicine or funding that was the biggest hurdle, but the difficulty in effectively delivering the treatment drugs and services.展开更多
Since the publication of Hemingway’s“Indian Camp”in 1924,many scholars has considered Doctor Adams to be insensitive,cold-hearted,ethically immoral.Some others labeled him as a racist and a sexist.After a scrupulou...Since the publication of Hemingway’s“Indian Camp”in 1924,many scholars has considered Doctor Adams to be insensitive,cold-hearted,ethically immoral.Some others labeled him as a racist and a sexist.After a scrupulous and strenuous close reading together with extensive reviewing and analyzing of relevant references,the author of this paper finds that Uncle George has always been misinterpreted over the time.This paper aims to point out the misunderstanding,misinterpretation or even distortion in the previous researches,in an attempt to defend for Doctor Adams and put the record straight.展开更多
A defender–attacker–target problem with non-moving target is considered.This problem is modelled by a pursuit-evasion zero-sum differential game with linear dynamics and quadratic cost functional.In this game,the pu...A defender–attacker–target problem with non-moving target is considered.This problem is modelled by a pursuit-evasion zero-sum differential game with linear dynamics and quadratic cost functional.In this game,the pursuer is the defender,while the evader is the attacker.The objective of the pursuer is to minimise the cost functional,while the evader has two objectives:to maximise the cost functional and to keep a given terminal state inequality constraint.The open-loop saddle point solution of this game is obtained in the case where the transfer functions of the controllers for the defender and the attacker are of arbitrary orders.展开更多
In this paper the basic principle and the problems meriting attention in the design and application of active ear defenders are discussed quantitatively. A feasible structure and its experimental results are given. It...In this paper the basic principle and the problems meriting attention in the design and application of active ear defenders are discussed quantitatively. A feasible structure and its experimental results are given. It is illustrated that the chief significance of ' active ' is to change the mechanical impedance of the ear defender accordingly, and because of this mechanism, the noise attenuation effectiveness in the low frequency range is improved.展开更多
A much-anticipated law protecting homeowners’ rights is on the horizon Television audiences around the country were shocked on November 21,2009,when national broadcaster China Central Television showed clips of two f...A much-anticipated law protecting homeowners’ rights is on the horizon Television audiences around the country were shocked on November 21,2009,when national broadcaster China Central Television showed clips of two families violently fighting lawenforcement officials who were evicting them from their homes.展开更多
Defending the many with the few" is an effectivetraining method to enhance the defensive ability of the whole team. The results of this study indicated that through the system of two-on-three, three-on-four and f...Defending the many with the few" is an effectivetraining method to enhance the defensive ability of the whole team. The results of this study indicated that through the system of two-on-three, three-on-four and four -on-five and intensified training, players could impove themselves in a short period in collective abilitys and consciousness, such as choosing position, adjusting position, coordinating defence and shifting defence. And team ability and style could thus be trained.展开更多
基金Supported by the National High Technology Research and Development Program of China (863 Program)(No.2003AA142080, 2005AA775060)the National Natural Sicence Foundation of China(No.60203004)National Basic Research Program of China (973Program) (No.2003CB314805)the National Outstanding Youth Foundation (No.60325102)
文摘An approach of defending against Distributed Denial of Service (DDoS) attack based on flow model and flow detection is presented. The proposed approach can protect targets from DDoS attacking, and allow targets to provide good service to legitimate traffic under DDoS attacking, with fast reaction. This approach adopts the technique of dynamic comb filter, yields a low level of false positives of less than 1.5%, drops similar percentage of good traffic, about 1%, and passes neglectable percentage of attack bandwidth to the victim, less than 1.5%. The prototype of commercial product, D-fighter, is developed by implementing this proposed approach on Intel network processor platform IXP1200.
文摘LIU Jie still remembers the challenges she faced in the fight against the AIDS epidemic during her stint as a medical volunteer in Nigeria six years ago. Ironically, it was not the lack of medicine or funding that was the biggest hurdle, but the difficulty in effectively delivering the treatment drugs and services.
文摘Since the publication of Hemingway’s“Indian Camp”in 1924,many scholars has considered Doctor Adams to be insensitive,cold-hearted,ethically immoral.Some others labeled him as a racist and a sexist.After a scrupulous and strenuous close reading together with extensive reviewing and analyzing of relevant references,the author of this paper finds that Uncle George has always been misinterpreted over the time.This paper aims to point out the misunderstanding,misinterpretation or even distortion in the previous researches,in an attempt to defend for Doctor Adams and put the record straight.
文摘A defender–attacker–target problem with non-moving target is considered.This problem is modelled by a pursuit-evasion zero-sum differential game with linear dynamics and quadratic cost functional.In this game,the pursuer is the defender,while the evader is the attacker.The objective of the pursuer is to minimise the cost functional,while the evader has two objectives:to maximise the cost functional and to keep a given terminal state inequality constraint.The open-loop saddle point solution of this game is obtained in the case where the transfer functions of the controllers for the defender and the attacker are of arbitrary orders.
文摘In this paper the basic principle and the problems meriting attention in the design and application of active ear defenders are discussed quantitatively. A feasible structure and its experimental results are given. It is illustrated that the chief significance of ' active ' is to change the mechanical impedance of the ear defender accordingly, and because of this mechanism, the noise attenuation effectiveness in the low frequency range is improved.
文摘A much-anticipated law protecting homeowners’ rights is on the horizon Television audiences around the country were shocked on November 21,2009,when national broadcaster China Central Television showed clips of two families violently fighting lawenforcement officials who were evicting them from their homes.
文摘Defending the many with the few" is an effectivetraining method to enhance the defensive ability of the whole team. The results of this study indicated that through the system of two-on-three, three-on-four and four -on-five and intensified training, players could impove themselves in a short period in collective abilitys and consciousness, such as choosing position, adjusting position, coordinating defence and shifting defence. And team ability and style could thus be trained.
