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This talk reviews the progresses on cavity optomechanical sensing. A comparison of mass induced and optical spring based sensing approaches are presented. Future improvements that may enable the detection of single atoms are discussed.
In this paper, a new photonic sampling structure with effective nonlinearity suppression and good signal-to-noise ratio (SNR) performance is proposed. The key feature of this scheme is the polarization-dependent modulators (P-DMZMs) and the sagnac loop structure. Attributing to the polarization sensitive characteristic of P-DMZMs, differences between transfer functions of the fundamental signals and...
Wireless multicast is a key enabling technology for efficient distribution of high-rate multimedia services in future wireless communication systems. When there are a massive number of users in the system, it is impractical or inefficient to serve all users with a single multicast beamformer and within a single channel. We therefore study the joint multicast beamforming and user scheduling problem,...
The performance of router directly impacts the Network-on-Chip (NoC) performance. This paper focus on developing efficient microarchitecture of allocator in the router and proposed matrix-diagonal allocator with high matching quality and low packets latency. The allocator, taking advantage of the fact that each element in the diagonal doesn't share the same row or column, includes matrix-diagonal...
In this paper, a robust visual tracking system with occlusion handling is proposed to track the target with real-time performance. The thermal camera, which can observe the heat originated from the target such as the human body or vehicle, can collaborate with the color camera to track the target in the cluttered environment or under occlusion. Unlike the general tracking by using the color camera...
The high-level feature representation of deep convo-lutional neural networks (ConvNets) has proven to be superior to hand-crafted low-level features. Thus, this study investigates the effect of fusing such high-level features from multi-deep ConvNets under an application of visual object/scene categorization. In which, three pre-trained ConvNets are exploited as feature extractors, a single hidden...
In this paper, based on optoelectronic oscillator (OEO) and post digital linearization techniques, a wideband microwave photonic downconverter with low phase noise and improved linearization is proposed and demonstrated. The local oscillator signal from OEO with 26GHz and radio frequency (RF) signal are fed to an intensity modulator (IM) at quadrature point, leading to downconversion at photodiode...
Radio frequency (RF) transceivers with zero intermediate frequency (IF) architecture feature the advantages of frequency agile, large bandwidth, simple structure and easy integration, but suffer from local oscillator (LO) leakage, dc offset, even-order distortion, in-phase/quadrature (I/Q) imbalance. A wideband zero-IF transceiver based on photonic I/Q mixing techniques is proposed. In the experiment,...
In a Wireless Sensor Network (WSN), there are a large number of nodes whose power supply and computational capability are limited. The nodes in a wireless sensor network can be fixed or move randomly. Thus in these networks, to forward a data packet from one node to another needs to use specific strategies with very different characteristics. Accordingly the data forwarding strategy among nodes plays...
Compared to homogeneous robotic teleoperation system, the design and control of heterogeneous robotic teleoperation system are facing greater challenges, due to the differences in the mechanical structures, DOFs (Degree of Freedoms) and task spaces between the master and slave robots. In this paper, first, a heterogeneous teleoperation system is designed where a Phantom Omni haptic device is utilized...
This paper focuses on GNSS and Inertial Navigation System (INS) integration system based on the loosely coupled (LC) and tightly coupled (TC) schemes. This paper describes the system architechture of two systems and presents the mathematical derivation. In order to evaluate the system performance of the two schemes, a real field experiment was carried in the campus of Beijing Jiaotong University....
This paper gives an overview on system architecture and function of electromagnetic interference on-site detection system. A special RF filter bank was designed to protect the system, and radio monitoring technology is used to locate the source of the on-site electromagnetic interference, and help improve the safety features of satellite system more actively.
In this paper, a robust visual tracking system by utilizing the images acquired from a color camera and a thermal camera is proposed to track the target with real-time performance. The thermal camera, which can observe the heat originated from the target such as the human body or vehicle, can collaborate with the color camera to track the target in the cluttered environment or under occlusion. Unlike...
In this paper, an optical frequency 16-tupling scheme for Sub-THz generation is proposed and demonstrated. The scheme is based on bi-directional use of dual-parallel polarization modulator (DPPMs) in two cascaded Sagnac loops. Along the clockwise and counter-clockwise directions in sagnac loops, optical signals with only ±8th-order sidebands are achieved without optical filter. Theoretical analysis...
Due to the durability of NVM, we are facing the great challenge of performing efficient memory defragmentation on persistent heaps. To address the problem, we propose an Online Persistent Memory Defragmentation (OPMD) method to manage persistent heaps. Employing two segment trees to track memory allocation and deallocation operations, our method can amortize the cost of global scan, and determine...
This paper first briefly surveys the near-field scanning for antenna measurements, then focuses on the near-field scanning for electromagnetic compatibility (EMC) applications. Key theories and practices are covered, and some latest development and open issues regarding the near-field scanning for EMC applications are finally presented.
With the advantage of low power consumption, Non-Volatile Memories (NVMs) has been widely used in hybrid memory architecture. This paper presents a page replacement method based on NVM-DRAM hybrid main memory system for low power and consistency guarantee, called EAPR The energy consumption of page access in DRAMs and NVMs can be calculated according to the memory access, and the pages are migrated...
This paper studies the simultaneous fault diagnosis of the main reducer in the automobile transmission system assembly based on vibration signals. A simultaneous fault diagnosis model based on Paired Relevance Vector Machine (Paired-RVM) is proposed for the simultaneous fault of the main reducer, and each binary sub-classifier is trained with single fault samples and then fused by a pairing strategy...
We design and fabricate a silicon based 1×2 optical switch based on the free-carrier plasma dispersion effect, with a Mach-Zehnder interferometer structure on silicon-on-insulator (SOI) wafer. The experimental result shows that it has an extinction ratio of 21.8 dB at 1546 nm, which meets the requirements of the most applications in optical telecommunication networks.
In this paper, fully distributed time-varying formation tracking problem for general linear time-invariant (LTI) multi-agent systems is investigated by using an adaptive-based approach. The communication topology is a spanning tree in which a leader's output is available to only a subset of the agents (followers) among which the communication is undirected. The followers can form a time-varying formation...
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