Journal of China Universities of Posts and Telecommunications最新文献

The tensor representation of quantum teleportation shows the internal connection between Bell basis measurement matrix T^α and channel parameter matrix (CPM) R. An explicit CPM criterion based on the tensor representation is derived. This criterion can be used to judge whether a quantum state can be employed as the quantum channel or not in teleportation and bidirectional teleportation, and it provides us more flexible choices to construct the quantum channel.

The rapid development of technologies towards Internet of Things (IoT), has led to new circumstances at all levels of the social environment. In healthcare in particular, the use of IoT concepts and technologies make diagnose and monitor more convenient for the physicians and patients. As mobile applications solutions are widely accepted because the easy to use, secure healthcare service is a new demand for mobile solutions. To protect the privacy and security for patients in the domain of healthcare towards IoT, a systematic mechanism is needed. This article proposes a novel security and privacy mechanism for Health Internet of Things (Health-IoT) to solve above problems. Health-IoT is promising for both traditional healthcare industry and the information and communication technologies (ICTs) industry. From the view of trustworthiness, interactive vector was proposed to communicate the end-devices and application brokers. The aim is to establish a trust IoT application market (IAM), feature of application in marketplace and behavior of applications on end-devices can be exchanged in mathematical value to establish the connection between market and users.

Cooperation among heterogeneous base stations can improve spectrum efficiency through interference avoidance. This paper introduces a time reversal (TR) technique in multi-cell cooperation to mitigate interference and efficiently allocate spectrum resources. Exploiting its inherent power concentration feature, TR can effectively tackle the problem of edge effect. We present analysis and simulation results to demonstrate that proper use of TR significantly improves the spectrum efficiency of heterogeneous networks.

This paper presents a new method for protocol reverse engineering, which combines both the dynamic and static binary analysis. Our work not only does precise positioning on the field and its length, but also gives the field attributes accurately. According to different instructions and the current program structure, we can infer the message format validly. To prove the method is sound and effective, we build a prototype tool – NetProtocolFinder, and select some documented protocol and undocumented protocol messages as the test instances respectively. Results of our experiments show that the tool can not only extract the message format from protocols effectively, but also speculate the state machine model through relevant field attributes conveniently.

Measure synchronization (MS) is a novel phenomenon which can be found in some coupled Hamiltonian systems (HS). In this paper, we built a new model called two coupled phase oscillators system (CPOS), and found that, under the appropriate initial conditions, it will meet a critical phenomenon in the phase space as the coupling strength increases. We also found the critical state by introducing the Poincaré section technique. We established a new formula for the critical coupling strength by analyzing the HS model, and extended this formula to the CPOS. The numerically analytical results show the reason why the measure synchronization of CPOS does not exist.

This paper designs a distributed low-rate denial of service (LDoS) attack using one-dimensional random walk algorithm. One-dimensional random walk algorithm can be used in generating power-law distribution which complies with normal network behavior feature. In this attack pattern, the behavior of each distributed attack flows are normal and nonperiodic, while the aggregated effect has the same damage degree as traditional square wave LDoS attacks. As the distributed attack flow satisfies the network traffic behavior feature, it is even more difficult to detect and trace back attack sources. The study on the feature of this attack provides reference for distributed low-rate DoS attack countermeasures.

It is an important function for managers to keep away from information security risks. With the increasing complex and scale of information systems, information system security risks may be more difficult to assess and strategies for risk reduction may be lack of objectivity. To solve this problem, this paper proposes a knowledge-based information security risk assessment method in which basic rules and specific rules are defined to match every asset, threat and vulnerability. Basic rules are defined as the rules without influence of external relationships. Specific rules are defined as the rules by user group. Performance analysis shows this method could increase efficiency and ensure accuracy of risk assessment.

Rural medical and health collaborative working platform is a collaborative platform which combines information processing system, office management, and telemedicine and computer aided diagnosis system. The personal health records, expert information, fund management information, and any others on the rural medical and health collaborative working platform are user's privacy data, which need strong security protection. In order to achieve efficient data sharing between doctors and patients and ensure the data security, there must be strict access control policy to be applied on the rural medical and health collaborative working platform. In this paper, the access control and its application on the rural medical and health collaborative working platform are discussed from the perspective of user role management.

This paper characterizes the spatially-normalized degrees of freedom (DoF) of a 2-cell, 3-user per cell multiple input multiple output (MIMO) cellular networks with M antennas at each user and N antennas at each base station. We show that the spatially-normalized DoF is a piecewise linear function, with either M or N being the bottleneck. Given γ = M / N, we shown that for

A gain-flattened tellurite-based fiber Raman amplifiers (T-FRA) is proposed and numerically demonstrated. By solving the steady equation of a T-FRA, the characteristics including the gain and gain flatness of T-FRA is investigated. The results show that a T-FRA pumped by dual wavelengths can provide gain-flattened band with widths of 48 nm. Moreover, the average gain and gain flatness is 17.72 dB and 0.68 dB, respectively. The newly designed T-FRA is very promising in future optical fiber communication systems.