Search results for: Vincent W. S. Chan

Items from 1 to 20 out of 42 results

article

Cross-Layer Routing and Scheduling for Onboard Processing Satellites with Phased Array Antenna

Jihwan P. Choi, Seok-Ho Chang, Vincent W. S. Chan

IEEE Transactions on Wireless Communications > 2017 > 16 > 1 > 180 - 192

The advanced multibeam satellite equipped with phased array antenna and solid state power amplifiers can generate flexible beams, by managing interbeam interference to serve a very large number of users effectively over its coverage area. Onboard processing (OBP) functionality can enhance the flexibility of a large-scale antenna by speeding up computational processes and saving precious radio link...

chapter

Dynamic Optical Data Center Network Load Balancing and Resource Allocation

Henna Huang, Vincent W. S. Chan

2016 IEEE Global Communications Conference (GLOBECOM) > 1 - 7

GLOBECOM 2016 - 2016 IEEE Global Communications Conference

We highlight the advantages of dynamic wavelength allocation and path rerouting in hybrid optical flow-switched data center networks compared with static electronic packet-switched data center networks. Current electronic packet-switched networks perform routing based on lookup tables and shortest path routing over high speed optical connections. However, load balancing and path rerouting are not...

chapter

A random access scheme for satellite packet communication with intentional interference

John Metzger, Vincent W. S. Chan, Christopher C. Yu, Claude E. Shannon

MILCOM 2016 - 2016 IEEE Military Communications Conference > 79 - 84

MILCOM 2016 - 2016 IEEE Military Communications Conference (MILCOM)

We study a random access scheme for satellite packet communication with intentional interference. A modified Slotted ALOHA protocol is used with interferer power sensing to achieve maximum user throughput. For a malicious interferer who ignores the control parameters broadcast by the satellite (such as the back-off parameter), we show that the degradation of channel throughput is inversely proportional...

chapter

Scalable and dynamic optical network architecture

Vincent W. S. Chan

2016 21st OptoElectronics and Communications Conference (OECC) held jointly with 2016 International Conference on Photonics in Switching (PS) > 1 - 3

2016 21st OptoElectronics and Communications Conference (OECC) / 2016 International Conference on Photonics in Switching (PS)

Future optical networks will integrate multi-layer functions, in a fast adapting infrastructure. When the data and control dynamics speed-up by 4 orders as projected, the entire network architecture must be redesigned to be scalable.

chapter

Cognitive optical wireless network

Vincent W. S. Chan

2016 18th International Conference on Transparent Optical Networks (ICTON) > 1 - 4

2016 18th International Conference on Transparent Optical Networks (ICTON)

Optical wireless network has the potential to serve both data centers and metropolitan area networks. Free space optical networks has one dimension that is not encountered in fiber networks and that is its ability to reconfigure its connection topology by beam steering in time scale of at least mS if not µS. This paper describes a cognitive technique for the fast estimation of traffic changes and...

chapter

Data center optical data link layer architecture design and analysis

Henna Huang, Vincent W. S. Chan

2016 IEEE International Conference on Communications (ICC) > 1 - 7

ICC 2016 - 2016 IEEE International Conference on Communications

We design and analyze optical data link layer protocols for data center networks. Specifically, we compare the delay performance of an Ethernet only architecture and a hybrid flow architecture. The need of a new architecture becomes apparent as data centers scale to support increasing data volume. The bursty and large volume of data introduced by “elephant” flows, flows composed of 100s to 1000s of...

chapter

Architecture for free space optical networks (invited paper)

Vincent W. S. Chan

2015 IEEE Avionics and Vehicle Fiber-Optics and Photonics Conference (AVFOP) > 9 - 10

2015 IEEE Avionics and Vehicle Fiber-Optics and Photonics Conference (AVFOP)

Free-space optical networks have serious block erasures due to atmospheric turbulence and require an entirely new network architecture from Layer 1 to Layer 4 for big data flows.

article

Point-of-care ultrasound defines gastric content and changes the anesthetic management of elective surgical patients who have not followed fasting instructions: a prospective case series

Husni Alakkad, Richelle Kruisselbrink, Ki Jinn Chin, Ahtsham U. Niazi, more

Canadian Journal of Anesthesia/Journal canadien d'anesthésie > 2015 > 62 > 11 > 1188-1195

Purpose Pulmonary aspiration of gastric contents is a major cause of anesthesia morbidity and mortality. Point-of-care gastric ultrasound provides information regarding the type and volume of gastric content. The hypothesis of this prospective cohort study was that the addition of point-of-care gastric ultrasound to standard patient assessment results in changes in anesthetic management in at least...

chapter

Metropolitan and access network architecture design for optical flow switching

Anny Xijia Zheng, Lei Zhang, Vincent W. S. Chan

2014 IEEE Global Communications Conference > 2036 - 2041

GLOBECOM 2014 - 2014 IEEE Global Communications Conference

In this work, we provide design concepts of efficient physical and lightpath topology architectures for a LAN/MAN all-optical network that support optical flow switching. We found good architectures are coupled intimately with media access control protocol designs and must be optimized jointly. Two architectures that represent extreme cases were examined: Quasi-Static Architecture and Dynamic Per...

chapter

Optical Flow Switching with Physical Layer Impairments: Modeling, Algorithm, and Control

Lei Zhang, Vincent W. S. Chan

2015 IEEE Global Communications Conference (GLOBECOM) > 1 - 7

GLOBECOM 2015 - 2015 IEEE Global Communications Conference

Switching-induced physical layer impairments in EDFA-amplified optical links pose significant challenges to the applicability of optical flow switching (OFS). Based on measured data we have developed a model to predict lightpath quality and a scheduling algorithm that guarantees quality of lightpaths. Our algorithm greatly reduces control complexity and control traffic and can set up new lightpaths...

chapter

Optical network architecture for “Elephant” traffic

Vincent W. S. Chan, Lei Zheng, Henna Huang, Anny Zhang

2014 16th International Conference on Transparent Optical Networks (ICTON) > 1 - 4

2014 16th International Conference on Transparent Optical Networks (ICTON)

Future large Internet transactions (“Elephants”) will not be supported efficiently by TCP/IP Internet Protocols and traditional switching and routing paradigms. This talk describes an entire optical network architecture from the Physical Layer to the Application Layer that will support “elephants” much more efficiently and economically. In particular, bursty dynamic elephant traffic can cause serious...

article

Optical flow-switched transport layer protocol design and performance analysis

Henna Huang, Vincent W. S. Chan

IEEE/OSA Journal of Optical Communications and Networking > 2014 > 6 > 9 > 801 - 815

We explore transport layer protocol design for a scheduled optical flow-switched network. The design guarantees the reliable delivery of large data files (“elephant” flows) over an all-optical end-to-end flow-switched network that can be modeled as a burst-error channel. We describe a good first-order channel model for optical flow-switched networks with optical amplifier transients. First, we show...

article

From the Journal archives: Practical applicability of the epidural electrical stimulation test

Faraj W. Abdallah, Vincent W. S. Chan

Canadian Journal of Anesthesia/Journal canadien d'anesthésie > 2014 > 61 > 9 > 881-885

article

The addition of epidural local anesthetic to systemic multimodal analgesia following lumbar spinal fusion: a randomized controlled trial

Stephen Choi, Y. Raja Rampersaud, Vincent W. S. Chan, Oma Persaud, more

Canadian Journal of Anesthesia/Journal canadien d'anesthésie > 2014 > 61 > 4 > 330-339

Purpose This randomized trial aimed to evaluate the effects of adding continuous epidural analgesia with a bupivacaine and hydromorphone solution to systemic multimodal analgesia following one- or two-level lumbar spinal fusion. Methods Thirty-nine patients undergoing lumbar spinal fusion, stratified for sex and one- or two-level fusion, were randomized to receive a continuous postoperative epidural...

chapter

Nulling strategies for preventing interference and interception of free space optical communication

Manishika Agaskar, Vincent W. S. Chan

2013 IEEE International Conference on Communications (ICC) > 3927 - 3932

ICC 2013 - 2013 IEEE International Conference on Communications

Free space optical systems can transmit at high data rates and can provide cheap, easily deployable solutions for both short-term and long-term communication needs. Controlling the direction of energy propagation from the optical transmitter can prevent communication between two users from interfering with another user in an optical network and can reduce the susceptibility of the system to eavesdropping...

chapter

Keynote Speakers: Where optical and wireless networks meet computing

Vincent W. S. Chan, Fumiyuki Adachi

2013 Computing, Communications and IT Applications Conference (ComComAp) > 1 - 2

2013 Computing, Communications and IT Applications Conference (ComComAp)

The increase of capacity to support orders of magnitude increase in data rates of a wireless network in a heavily user congested area with little available spectrum is one of the toughest problems facing the network community. Traditional information and communication theory methods provide only modest gains and no such techniques suggest any prospect of substantial increase in user rates. This talk...

article

Ultrasound-Guided Transversus Abdominis Plane (TAP) Block for Laparoscopic Gastric-Bypass Surgery:a Prospective Randomized Controlled Double-Blinded Trial

Eric Albrecht, Kyle R. Kirkham, Ryan V. W. Endersby, Vincent W. S. Chan, more

Obesity Surgery > 2013 > 23 > 8 > 1309-1314

Background Despite the laparoscopic approach, patients can suffer moderate to severe pain following bariatric surgery. This randomized controlled double-blinded trial investigated the analgesic efficacy of ultrasound-guided transversus abdominis plane (TAP) blocks for laparoscopic gastric-bypass surgery. Methods Seventy patients undergoing laparoscopic gastric-bypass surgery were randomized to receive...

chapter

Link state distribution rate scaling for maintaining topology in mobile wireless networks

Shane A. Fink, Vincent W. S. Chan, Christopher C. Yu

MILCOM 2012 - 2012 IEEE Military Communications Conference > 1 - 6

MILCOM 2012 - 2012 IEEE Military Communications Conference

In some current mobile ad hoc network designs, we have observed that the link state update protocol may take up all the network throughput and leave little to no capacity for data transmission. In this paper we explore the throughput scaling necessary to maintain an updated topology in a fixed rate mobile infrastructureless wireless network. We use a mobility model where each node travels along a...

chapter

Power optimization of optical wide area networks

Katherine X. Lin, Vincent W. S. Chan

2012 14th International Conference on Transparent Optical Networks (ICTON) > 1 - 7

2012 14th International Conference on Transparent Optical Networks (ICTON)

In this paper we explore scalable power efficient architectures for optical WAN. The network traffic we assume is 10–100 times larger than what it is today, the rationale being power efficiency will become the paramount obstacle in the next decade when network demands dramatically increases by orders of magnitude. We find using optical by bypass, optical switching at major nodes, WAN topology and...

article

Optical Flow Switching Networks

Vincent W. S. Chan

Proceedings of the IEEE > 2012 > 100 > 5 > 1079 - 1091

Present-day networks are being challenged by dramatic increases in data rate demands of emerging applications. A new network architecture, incorporating “optical flow switching,” will enable significant rate growth, power efficiency, and cost-effective scalability of next-generation networks. We will explore architecture concepts germinated 22 years ago, technology and testbed demonstrations performed...

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Keywords

OPTICAL FIBER NETWORKS (10)
OPTICAL SWITCHES (9)
DELAYS (6)
OPTICAL FLOW SWITCHING (4)
PROTOCOLS (4)
ROUTING (4)
THROUGHPUT (4)
INTEGRATED OPTICS (3)
NETWORK TOPOLOGY (3)
OPTICAL AMPLIFIERS (3)
OPTICAL FIBERS (3)
OPTICAL PACKET SWITCHING (3)
APERTURES (2)
BANDWIDTH SCALING (2)
BEAMFORMING (2)
COMPUTER ARCHITECTURE (2)
IMAGE MOTION ANALYSIS (2)
LOCAL AREA NETWORKS (2)
MANET (2)
OPTICAL RECEIVERS (2)
OPTICAL TRANSMITTERS (2)
SATELLITE BROADCASTING (2)
SATELLITES (2)
TOPOLOGY (2)
TRANSCEIVERS (2)
VECTORS (2)
WIDE AREA NETWORKS (2)
WIRELESS AD-HOC NETWORK (2)
WIRELESS NETWORKS (2)
ADAPTIVE OPTICS (1)
ANESTHESIA (1)
APPROXIMATION METHODS (1)
ARRAY SIGNAL PROCESSING (1)
ARRAYS (1)
ATMOSPHERIC TURBULENCE (1)
AUTHENTICATION (1)
AUTOMATIC REPEAT REQUEST (1)
BANDWIDTH ALLOCATION (1)
BANDWIDTH DEMAND (1)
CHANNEL CAPACITY (1)
CLEAR-AIR TURBULENCE (1)
COHERENT PROCESSING (1)
COHERENT SYSTEMS (1)
COMMUNICATION SYSTEM CONTROL (1)
COMMUNICATION SYSTEM TRAFFIC (1)
COMMUNICATIONS (1)
COMPUTER NETWORKS (1)
COMPUTER VISION (1)
CONNECTIVITY (1)
CORE FIBER NETWORKS (1)
COST-EFFECTIVE SCALABILITY (1)
COUPLINGS (1)
DATA CENTER (1)
DATA COMMUNICATION (1)
DATA LINK LAYER (1)
DATA NETWORK ARCHITECTURE (1)
DATA NETWORKS (1)
DELAY (1)
DESIGN AND PERFORMANCE ANALYSIS (1)
DIRECTIONAL ANTENNA (1)
DYNAMIC PER FLOW ROUTING ARCHITECTURE (1)
ELECTRIC SHOCK (1)
ENERGY MINIMIZATION (1)
ERBIUM-DOPED FIBER AMPLIFIERS (1)
ESTIMATION (1)
FORWARD ERROR CORRECTION (1)
FREE-SPACE OPTICAL COMMUNICATIONS (1)
FREE-SPACE OPTICAL NETWORKING (1)
GAIN (1)
GAIN MEASUREMENT (1)
GASTRIC-BYPASS SURGERY (1)
HELIUM (1)
HIGH RELIABILITY COMMUNICATIONS (1)
HIGH-CAPACITY SERVICE (1)
INTERFERENCE (1)
INTERFERENCE LEVEL REDUCTION (1)
LIGHT COHERENCE (1)
LOAD MANAGEMENT (1)
LOAD MODELING (1)
MATHEMATICAL MODEL (1)
METROPOLITAN AREA NETWORK (1)
MICE (1)
MILITARY COMMUNICATION (1)
MULTIBEAM SATELLITE (1)
MULTIPLE ACCESS APPLICATIONS (1)
MULTIPLE-ACCESS OPTICAL CHANNEL (1)
NETWORK ARCHITECTURE (1)
NETWORK PROTOCOLS (1)
NETWORK SEGMENTATION (1)
NEXT-GENERATION NETWORKS (1)
NOISE (1)
OBESITY (1)
ONBOARD PROCESSING (OBP) (1)
OPTICAL BUFFERING (1)
OPTICAL COMMUNICATION (1)
OPTICAL FIBER AMPLIFIERS (1)
OPTICAL FIBER CABLES (1)
OPTICAL FIBER COMMUNICATION (1)
OPTICAL FIBER DEVICES (1)
OPTICAL LINKS (1)
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INFONA - science communication portal

Search results for: Vincent W. S. Chan

Cross-Layer Routing and Scheduling for Onboard Processing Satellites with Phased Array Antenna

Dynamic Optical Data Center Network Load Balancing and Resource Allocation

A random access scheme for satellite packet communication with intentional interference

Scalable and dynamic optical network architecture

Cognitive optical wireless network

Data center optical data link layer architecture design and analysis

Architecture for free space optical networks (invited paper)

Point-of-care ultrasound defines gastric content and changes the anesthetic management of elective surgical patients who have not followed fasting instructions: a prospective case series

Metropolitan and access network architecture design for optical flow switching

Optical Flow Switching with Physical Layer Impairments: Modeling, Algorithm, and Control

Optical network architecture for “Elephant” traffic

Optical flow-switched transport layer protocol design and performance analysis

From the Journal archives: Practical applicability of the epidural electrical stimulation test

The addition of epidural local anesthetic to systemic multimodal analgesia following lumbar spinal fusion: a randomized controlled trial

Nulling strategies for preventing interference and interception of free space optical communication

Keynote Speakers: Where optical and wireless networks meet computing

Ultrasound-Guided Transversus Abdominis Plane (TAP) Block for Laparoscopic Gastric-Bypass Surgery:a Prospective Randomized Controlled Double-Blinded Trial

Link state distribution rate scaling for maintaining topology in mobile wireless networks

Power optimization of optical wide area networks

Optical Flow Switching Networks

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