交通大學IBM中心特別邀請到ECE Department at New York University 的 Prof. H. Jonathan Chao 前來為我們演講，歡迎有興趣的老師與同學免費報名參加！

演講標題：CFR-RL: Traffic Engineering with Reinforcement Learning in SDN
演 講 者：Prof. H. Jonathan Chao (ECE Department at New York University)
時 間：2020/01/20(一) 15:00 ~ 17:00
地 點：交大工程四館816室
活動報名網址：https://forms.gle/k5txEfTX6jM7PBR98
聯絡方式：曾紫玲 Tel：03-5712121分機54599 Email：tzuling@nctu.edu.tw

Abstract:
Traffic Engineering (TE) is one of important network features for Software-Defined Networking (SDN) with an aim to help Internet Service Providers (ISPs) optimize network performance and resource utilization by configuring the routing across their backbone networks. Although TE solutions can achieve the optimal or near-optimal performance by rerouting as many flows as possible, they do not usually consider the negative impact, such as packet out of order, when frequently rerouting flows in the network. To mitigate the impact of network disturbance, one promising TE solution is forwarding the majority of traffic flows using Equal-Cost Multi-Path (ECMP) and selectively rerouting a few critical flows using SDN to balance link utilization of the network. However, critical flow rerouting is not trivial because the solution space for critical flow selection is immense. Moreover, it is impossible to design a heuristic algorithm for this problem based on fixed and simple rules, since rule-based heuristics are unable to adapt to the changes of the traffic matrix and network dynamics. In this talk, we describe a Reinforcement Learning (RL)-based scheme, called CFR-RL, that learns a policy to select critical flows for each given traffic matrix automatically. It then reroutes these selected critical flows to balance link utilization of the network by formulating and solving a simple Linear Programming (LP) problem. Extensive evaluations show that CFR-RL outperforms the best heuristic by 7.4% - 12.2% and reroutes only 10% - 21.3% of total traffic.

Biography:
H. Jonathan Chao is Professor of Electrical and Computer Engineering (ECE) at NYU, where he joined in January 1992. He is currently Director of High-Speed Networking Lab. He was Head of ECE Department from 2004-2014. He has been doing research in the areas of software defined networking, network function virtualization, datacenter networks, packet processing and switching, network security, and machine learning for networking. He holds 63 patents and has published more than 265 journal and conference papers. During 2000–2001, he was Co-Founder and CTO of Coree Networks, NJ, where he led a team to implement a multi-terabit router with carrier-class reliability. From 1985 to 1992, he was a Member of Technical Staff at Bellcore, where he was involved in network architecture designs and ASIC implementations, such as the world’s first SONET-like Framer chip, ATM Layer chip, Sequencer chip (the first chip handling packet scheduling), and ATM switch chip. He is a Fellow of National Academy of Inventors (NAI) for “having demonstrated a highly prolific spirit of innovation in creating or facilitating outstanding inventions that have made a tangible impact on quality of life, economic development, and the welfare of society.” He is a Fellow of the IEEE for his contributions to the architecture and application of VLSI circuits in high-speed packet networks. He received Bellcore Excellence Award in 1987. He is a co-recipient of the 2001 Best Paper Award from the IEEE Transaction on Circuits and Systems for Video Technology. He coauthored three networking books. He worked for Telecommunication Lab in Taiwan from 1977 to 1981. He received his B.S. and M.S. degrees in electronics engineering from National Chiao Tung University, Taiwan, in 1977 and 1980, respectively, and his Ph.D. degree in electrical engineering from The Ohio State University in 1985.

? คลิปรถใหม่ 2019-2020 มาแล้วครับ คลิกที่นี่ https://www.youtube.com/channel/UCSebcviE-UeYMxVRNozwqtw/videos

Body and Chassis Design

The 2018 Accord's new body structure is lighter and more rigid, utilizing 29 percent ultra-high-strength steel, the most ever for a mass-produced Honda car. Overall, the new Accord employs 54.2 percent high strength steel (above 440 MPa).

Key body features include the latest generation of Honda's Advanced Compatibility Engineering™ (ACE™) body structure with crash stroke front frame, tailor-tempered rear frame members for improved crash-energy absorption, and the extensive use of structural adhesives for increased rigidity, cabin quietness and weight reduction. Total vehicle weight is down between approximately 110 to 176 pounds, depending on trim, while body torsional and bending rigidity are improved 32 and 24 percent, respectively, aiding ride quality, cabin quietness, and dynamic performance.

Mated to the new body is a more sophisticated new chassis design. The 2018 Accord's chassis is 6-percent lighter than before (not including wheels and tires) and features a new Macpherson strut front suspension with L-shaped aluminum lower arms mounted to an aluminum front subframe. The new setup better isolates and manages varying road inputs, improving handling precision, ride quality and cabin quietness along with outstanding high-speed stability and control. The new, more space-efficient rear suspension is a multi-link design mounted to a more rigid, floating rear subframe. Fluid-filled compliance bushings at all four corners further improve ride comfort and absorption of road irregularities.

Touring trims of Accord also feature, for the first time, an Adaptive Damper System with the ability to adjust shock absorber damping force every 1/500 of a second (0.002 second), using a proprietary Honda control algorithm, providing for a more compliant and controlled ride in all driving situations. The adaptive dampers are tied to a Two-Mode Driving System with Normal and Sport modes that allows the driver to dial-up/down the vehicle's sporty reflexes depending on the driving environment. The system engages with multiple chassis and drivetrain components, including the new dual-pinion variable-ratio electric power steering (EPS), automatic transmission, drive-by-wire throttle, adaptive dampers and Active Sound Control system, to provide the driver with an expanded range of driving characteristics. An ECON mode is also available that helps improve fuel efficiency by modifying throttle mapping and HVAC operation.

The new Accord has a 10-mm lower center of gravity. The adoption of lighter-weight turbocharged engines and other body design changes reduce the vehicle's moment of inertia, resulting in crisper turn-in and steering response. All models now have near optimal FWD weight distribution of approximately 60/40 percent front/rear. Accords with the new 2.0-liter VTEC turbo and 10AT check in at approximately 61/39 percent front/rear, a significant improvement versus the current V6 Accord with 6AT.

Along with the first application of structural adhesives to Accord, cabin quietness is further enhanced by a comprehensive sound-insulating package that includes full underbody covers (which also aid aerodynamics), front and rear fender and engine compartment insulators, alloy wheels with Honda-proprietary resonator technology, sound-absorbing carpet, acoustic laminated windshield glass – plus front door acoustic glass on EX and above – and a new, 3-microphone Active Noise Control system. The result is low noise levels with a well-balanced sound quality and a pleasingly sporty engine note.

Advanced Safety and Driver-Assistive Technology
For 2018, all Accords feature the full suite of Honda Sensing® safety and driver-assistive technologies as standard equipment. Honda Sensing includes Collision Mitigation Braking System™ (CMBS™), Lane Departure Warning, Road Departure Mitigation, Adaptive Cruise Control with Low-Speed Follow and, for the first time, Traffic Sign Recognition (see Safety section for more details). Additional available driver-assistive technologies include Blind Spot Information, front and rear parking sensors, Rear Cross Traffic Monitor and Driver Awareness Monitor; and all models feature a Multi-Angle Rearview Camera with dynamic guidelines.

Standard advanced active and passive safety systems include Vehicle Stability Assist with Traction Control, Anti-lock brakes with Electronic Brake Booster, Tire Pressure Monitoring System (TPMS), advanced front airbags, driver and front-passenger side airbags and new driver and front-passenger knee airbags. The Accord targets top U.S. government (NCAP) and IIHS collision safety ratings.