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In order to explore the mental retardation of patients with depression, the visual search paradigm was used in this study. The emotional expression (happy, sad) and neutral expression were used as interdependent or search targets in this paradigm. Subjects were asked to search the target face form a matrix containing 16 emotional faces after watching the target face. The measurement indices of the...
Depression is a mental disorder characterized by persistent occurrences of lower mood states in the affected person. According to the study of World Health Organization (WHO), depression will become the second largest cause of illness threatening the life of human beings in 2020, so early detection, early diagnosis and early treatment of depression is very important to save the health and life of...
Recently, Electroencephalogram (EEG) has become increasingly important in the role of psychiatric diagnosis and emotion recognition. However, many irrelevant features make it difficult to identify patterns accurately. Obtaining valid features from electroencephalogram can improve the classification and generalization performance. In this paper, an improved normalized mutual information feature selection...
Detecting depression via speech is an attractive topic in recent years. Significant correlation was found between speech pause time and depressive severity. In the present study, 92 depressed patients and 92 age-, gender- and education level-matched control participants were examined to investigate three temporal characteristics of speech: recording time (RT), phonation time (PT) and speech pause...
Ejected plasma used in gas spark switch has been proved efficient as a trigger method. However, the development and trigger mechanism are still to be revealed. In this paper, an experimental platform was built to investigate the influence of trigger pulse energy and polarity on the space-time shape evolution characteristics and the ejecting characteristic of ejected plasma. The results indicate that...
Recent development renewable energy increases the requirement in constructing multi-terminal HVDC systems or HVDC grids. To increase the system reliability, an HVDC circuit breaker will be required. However the existing HVDC breakers developed in recent years use large amount of IGBTs. Considering the cost reduction in real HVDC grids, this paper presents a novel hybrid HVDC circuit breaker. The proposed...
This paper proposes a novel passive hybrid high-voltage DC circuit breaker based on thyristors. A current commutation circuit to turn off the thyristors is designed with elements of relatively low current and voltage ratings. Moreover, voltage balancing strategy is applied to protect the series-connected device.
LTE-PON hybrid access architecture for Power Distribution Communication Network (PDCN) allows a good trade-off among cost, flexibility, and reliability. In this paper, we focus on the case where LTE-based wireless power private network already deployed in PDCN and Aggregation Points (APs), which forward data between client terminals and the control center, can be served by either LTE network or PON...
Due to the lack of spectrum resource of power wireless private network, it is difficult to guarantee the transmission for the services in the distribution network. In order to enhance the network resource utilization, this paper puts forward a method for the uplink resource scheduling of power wireless private network based on NB-IoT and LTE hybrid transmission. Firstly, through the cognizing for...
Device to Device (D2D) multicast communication is an effective method for local transmission. In this paper, a joint power and resource allocations scheme is proposed to maximize the number of accessed D2D groups while minimizing the total terminal transmission power for D2D underlay multicast communication. Since the derived optimization is a mixed integer nonlinear programming problem with high...
LTE-based Public Safety Network (PSN) is a wireless communication network which can provide efficient and reliable communication in disasters or emergencies for disaster relief and public protection. Therefore, ensuring that network congestion will not happen in PSN during an emergency is becoming increasingly important. LTE-based PSN is easy to be congested because part of spectrum resources is compressed...
This paper proposes a novel Gain-Aware Uplink-Downlink(GAUD) jointly resource allocation scheme to maximize the Device-to-Device(D2D) throughput while guaranteeing Quality of Service (QoS) of cellular users. We formulate the global optimization problem as a mixed integer nonlinear programming problem and decompose it into three sub-problems. Firstly, a method of jointly uplink and downlink reuse mode...
Package warping during SMT reflow is a seriousconcern as warpage induced interconnect failures suchas Head-in-Pillow (HiP) and Non-Wet-Open (NWO) must be controlled. In this study, the high temperature reflow dynamicwarpage characteristics of BGA packages are examinedusing a simple, controlled gap between the solder balland printed paste interconnect to simulate separation andlifting of the joint...
Digital microfluidic biochip (DMFB) is an attractive platform for immunoassays, point-of-care clinical diagnostics, DNA sequencing, and other laboratory procedures in laboratory experiments due to its flexible application and low fabrication cost and further for the development of instruments. As being applied for these safe-critical applications, on-line testing methods are required to ensure robust...
Recently, densified small cell deployment with overlay coverage through Heterogeneous Networks (HetNets) has emerged as a viable solution for 5G mobile networks. Cell Outage Detection (COD) which is the essential functionality in Self-Organizing Network (SON) is designed to autonomously deal with unexpected faults. Typical methods for detecting cell outage are usually based on Manual Drive Tests (MDT)...
In vehicular communication protocol stacks, received messages may not always be decoded successfully due to the complexity of the decoding functions, the uncertainty of the communication load and the limited computation resources. Even worse, an improper implementation of the protocol stack may cause an unfair data age distribution among all the communicating vehicles (the receiving bias problem)...
In high power applications, the insulated-gate bipolar transistors (IGBTs) are often required to be connected in parallel in order to withstand the large load current. However, the current of paralleled IGBTs may not be shared equally due to spread of parameters. The current unbalance in transient and steady state can result in overheat and overcurrent destruction of the devices. In this paper a novel...
This paper presents a hybrid HVDC circuit breaker topology with bidirectional interruption based on thyristors forced current zero technique for voltage sourced converter-high voltage dc (VSC-HVDC) system. In normal operation, the mechanical switch and small amount of IGBTs handles the low conduction loss. In case of interruption, the commutated current is forced to zero by injecting a current inversely...
Electrified railway has advantages of high speed, heavy load, high energy utilization and good economic benefits. However, its access to grid will bring about power quality problems such as harmonics, three-phase imbalance and reactive power, which goes against safe and economic operation of power system. In this paper, power quality issues especially harmonics, negative-sequence and reactive power...
This paper proposes a novel indoor-outdoor caching relay system (CRS) and develops the corresponding caching mechanism, which can improve the utilization of wireless resources. It operates in two phases periodically. In Phase I, spectrum resources of the established links between MBS and user equipment (UE) are extracted to support data caching. In Phase II, caching relay system can directly serve...
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