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An actively Q-switched Nd:GGG/BaWO4 single-frequency Raman laser at 1178.3 nm is demonstrated. Under a pulse repetition rate of 20 kHz, the maximum pulse energy was 12 μJ and the linewidth was less than 4.34×10−3 cm−1.
We realized a ytterbium-doped fiber self-similar amplification system emitting 50 fs pulses at an average power of 50 W, and made experimental comparisons of chirped-pulse and self-similar amplification at the same repetition rate.
We report a new RF photonic cancellation filter topology and demonstrate a sharp bandstop filter with a 20 dB suppression obtained from a sub-2 dB on-chip Brillouin loss in a broad 300 MHz reconfigurable bandwidth.
In this work, we propose a time-sensitive incentive-aware mechanism for mobile video offloading by using the idea of crowdsourcing, where video packet holder cooperates with mobile users to deliver video packets to destination. The objective is to maximize video provider and mobile relay users' payoffs. We formulate the interaction among video packet provider and mobile relay users as a two-person...
Real time analysis of fine granularity of log data can help people gain personalized insights on business. For example, real time analysis of e-commerce log data will help us learn recent changes of browsing and shopping behavior of specific customers, which enables us to provide personalized recommendations. To accomplish such analysis, log data should have been loaded quickly into data warehouse...
In the paper, we propose a method for improving maneuverability of master-slave systems. We aim for reproducing human skillfulness and dynamic performance in master-slave robots by using assist control for human operators. In this paper, we focus on a reaching task of a master-slave robot and propose an operation assist algorithm based on visual feedback control. It consists of visual recognition...
Region-based Image Retrieval (RBIR), which bases itself on image segmentation rather than global features or key-point-based local features, is a branch of Content-based Image Retrieval. This paper proposes a novel RBIR-oriented image segmentation algorithm named Edge Integrated Minimum Spanning Tree (EI-MST). The difference between EI-MST and the traditional MST-based methods is that EI-MST generates...
A shared-MSB sub-range delay-line-based window ADC capable of simultaneous quantization for digital control single-inductor-multiple-output (SIMO) DC-DC converter is proposed in this work. This ADC achieves the conversion by voltage-time-conversion (VTC) and time-digital-conversion (TDC). A Shared-MSB scheme is proposed and propagation delay of delay cells no longer depends on input voltages. Together...
Wireless localization with received signal strength (RSS) measurements catches a lot of attention for its simplicity and low cost. How to improve location estimation precision is a critical issue for localization applications with RSS measurements. In this paper, sensor selection method is involved. First, the optimal number of anchors to reach good performance is analyzed. Second, a quadratic program...
Advances in sensor networks enable pervasive health monitoring and patient-specific treatments that take into account the patients medical history, current state, genetic background, and personal habits. However, sensors are often battery power limited and vastly differ in their application related requirements. In this paper, we address both of these problems. Specifically, we study IEEE 802.15.6...
In recent years, the demand for robots that can perform various tasks in dangerous environments has increased. Teleoperated robots are more suitable for dangerous environments than autonomous robots. We have developed a master-slave robot system that consists of a lightweight master device and a high-power slave robot and proposed operation assistance methods to improve the dexterity and increase...
A well-designed energy-efficient routing protocol is an indispensable part for prolonging the lifetime of wireless sensor networks (WSNs) because a sensor node usually has limited energy. Many research efforts are contributed on routing design in WSNs. With the development of green technology, the energy harvesting technique is being applied to real WSNs. Therefore, existing routing protocols are...
The protein phosphorylation modifications are important to protein activities and functions. It has been widely recognized that dysfunctional phosphorylation modifications are related to cancer. Specifically, some single amino acid variations could disrupt existing phosphorylation kinase-substrate relationships and create novel kinase-substrate relationships. Besides, numerous network-based methods...
Sleep monitoring system helps to diagnose various health problems. Traditional solutions for sleep monitoring are usually invasive or limited to medical facilities. Radio Frequency (RF) based methods require specialized devices or dedicated wireless sensors. Recently, Wi-Fi based methods without any wearable or dedicated devices obtain more attention, however, they all assume that all the users are...
In the wireless communication, there are many cases where the transmission path is obstructed by unknown objects. With the rapid development of the drone technology in recent years, the drones are advocated to serve as mobile relays to forward data streams. However, the challenges are that data transmission may suffer severe signal attenuation due to the existence of the obstructions and it is challenging...
A comparator-based current mode control buck-boost DC-DC converter with low transition noise full-wave current sensor is reported in this work. The proposed comparator-based current mode control method with on-time modulation eliminates the controller delay in constant on/off time period during load transient, which is adopted in a buck-boost DC-DC converter to achieve faster load transient responses...
Osteoarthritis (OA) is the most common joint disease worldwide, resulting in severe joint pain and significantly decreased life quality in the elderly population. Due to the lack of effective medicine that can reverse the degeneration of articular cartilage, ultimately all OA patients need to receive an artificial joint replacement surgery. Although the pathogenesis and progression of OA has attracted...
As the fast development of Internet of Things (IoT), protection of security and privacy of user data in IoT devices and networks is getting more and more attention. To guarantee this protection, IoT devices are usually authenticated and the communication within the IoT network is encrypted. Therefore, it is important to have IoT devices agree keys with each other, as authenticator or encryption keys...
Motivated by the need for robust and high throughput communication with airborne platforms, a variable rate MIMO scheme that combines the D-BLAST architecture with per antenna spreading was proposed. This paper is focused on the experimental study of this approach. We developed a software defined radio implementation of the variable rate MIMO system based on GNU Radio. Over the air transmission and...
The train control center is an indispensable component for the safe operation of high speed railways. This paper analyzes the software function and performance for the train control center subsystem in Chinese Train Control System level 3. It focuses on the editing of active balise telegram, based on the theory of timed automata and hierarchical modeling. First, we analysis the process and form a...
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