Analysis of Two-Phase Path Management Scheme for MPLS Traffic Engineering

2009 ◽  
Vol E92-B (1) ◽  
pp. 59-67 ◽  
Author(s):  
Hitomi TAMURA ◽  
Kenji KAWAHARA ◽  
Yuji OIE
Keyword(s):  
Traffic Engineering ◽  
Two Phase ◽  
Management Scheme ◽  
Phase Path

FluidSMR: Adaptive Management for Hybrid SMR Drives

2021 ◽  
Vol 17 (4) ◽  
pp. 1-30
Author(s):  
Fenggang Wu ◽  
Bingzhe Li ◽  
David H. C. Du
Keyword(s):  
Adaptive Management ◽  
Magnetic Recording ◽  
Disk Drive ◽  
Allocation Scheme ◽  
Performance Impact ◽  
Two Phase ◽  
Dynamic Data ◽  
Management Scheme ◽  
Shingled Magnetic Recording ◽  
Single Disk

Hybrid Shingled Magnetic Recording (H-SMR) drives are the most recently developed SMR drives, which allow dynamic conversion of the recording format between Conventional Magnetic Recording (CMR) and SMR on a single disk drive. We identify the unique opportunities of H-SMR drives to manage the tradeoffs between performance and capacity, including the possibility of adjusting the SMR area capacity based on storage usage and the flexibility of dynamic data swapping between the CMR area and SMR area. We design and implement FluidSMR, an adaptive management scheme for hybrid SMR Drives, to fully utilize H-SMR drives under different workloads and capacity usages. FluidSMR has a two-phase allocation scheme to support a growing usage of the H-SMR drive. The scheme can intelligently determine the sizes of the CMR and the SMR space in an H-SMR drive based on the dynamic changing of workloads. Moreover, FluidSMR uses a cache in the CMR region, managed by a proposed loop-back log policy, to reduce the overhead of updates to the SMR region. Evaluations using enterprise traces demonstrate that FluidSMR outperforms baseline schemes in various workloads by decreasing the average I/O latency and effectively reducing/controlling the performance impact of the format conversion between CMR and SMR.

scholarly journals Contributory Factors of Traffic Accidents in Lahore Using Generalized Linear Models (GLM)

2019 ◽  
Vol 12 (1) ◽  
pp. 33-43
Author(s):  
Hajra Slam ◽  
Yasar Mahmood
Keyword(s):  
Traffic Control ◽  
Traffic Engineering ◽  
Poisson Regression ◽  
Traffic Accidents ◽  
Negative Binomial ◽  
Good Description ◽  
Sampling Technique ◽  
Geometric Design ◽  
Environmental Damage ◽  
Two Phase

The geometric design of roads is the branch of highway engineering concerned with the positioning of the physical elements of the roadway according to standards and limitations with objectives to optimize efficiency and safety while minimizing cost and environmental damage. The present study aims to explore geometric design and other factors which cause of accidents in Lahore. Data is collected from TEPA (Traffic Engineering and Planning Agency), NESPAK (National Engineering Services Pakistan), CTP (City Traffic Police) and Rescue 1122 over a period of 3 years. Two phase sampling technique has been used. Data is carried out about demographic information, physical characteristics and geometric design of roads. All registered 356 traffic accidents have been used on Ferozpur Road, Multan Road, Canal Bank Road and Grand Trunk in Lahore. Poisson regression and negative binomial regression are discussed in this research. SPSS and R Language are used for analysis. The results show that most of accidents occur at office off timing and fatal due to reckless driving and over speeding. Mostly, cars and tralala hit the bikes and Pedestrians. The Poisson regression model gives good description of number of accidents depends on various explanatory variables. Number of lanes, type of locations and roadway light are statistically significant. Narrow Shoulder width (m), Median Width (m) and Lane width (m) increase accident occurrence. Three lanes and larger road structures increase accidents. Numbers of accident increase when Roadway, type of locations, roadway light and traffic control signals decrease.

Offset-based curvilinear path estimation for mid vehicle collision detection and avoidance system using MARS

2019 ◽  
Vol 7 (2) ◽  
pp. 54-71
Author(s):  
Prabhakaran N. ◽  
Sudhakar M.S.
Keyword(s):  
Second Phase ◽  
Next Generation ◽  
Two Phase ◽  
Parallel Parking ◽  
Content Type ◽  
Reverse Motion ◽  
Vehicle Collision ◽  
True Path ◽  
Phase Path ◽  
Estimation Scheme

Purpose The purpose of this paper is to propose a novel curvilinear path estimation model employing multivariate adaptive regression splines (MARS) for mid vehicle collision avoidance. The two-phase path estimation scheme initially uses the offset (position) value of the front and the mid (host) vehicle to build the crisp model. The resulting crisp model is MARS regressed to deliver a closely aligned actual model in the second phase. This arrangement significantly narrows the gap between the estimated and the true path analyzed using the mean square error (MSE) for different offsets on Next Generation Simulation Interstate 80 (NGSIM I-80) data set. The presented model also covers parallel parking by encompassing the reverse motion of the host vehicle in the path estimation, thereby, making it amicable for real-road scenarios. Design/methodology/approach The two-phase path estimation scheme initially uses the offset (position) value of the front and the mid (host) vehicle to build the crisp model. The resulting crisp model is MARS regressed to deliver a closely aligned actual model in the second phase. Findings This arrangement significantly narrows the gap between the estimated and the true path studied using MSE for different offsets on real (Next Generation Simulation-NGSIM) data. The presented model also covers parallel parking by encompassing the reverse motion of the host vehicle in the path estimation. Thereby, making it amicable for real-road scenarios. Originality/value This paper builds a mathematical model that considers the offset and host (mid) vehicles for appropriate path fitting.

Two-Phase Path Planning for Robots With Six or More Joints

1990 ◽  
Vol 112 (1) ◽  
pp. 50-58 ◽  
Author(s):  
P. E. Dupont ◽  
S. Derby
Keyword(s):  
Optimal Path ◽  
Minimal Amount ◽  
World Model ◽  
Two Phase ◽  
Worst Case ◽  
Redundant Robots ◽  
Straight Line ◽  
Phase Path ◽  
Line Path ◽  
Path Modification

This paper presents a new method for planning collision-free paths for robots with any number of joints. It is particularly well suited for use with kinematically redundant robots. The algorithm is general in that it does not impose restrictions on the geometry, motion, or payload of the robot. It does not try to locate an optimal path. Instead, it attempts to locate a reasonable path while mapping a minimal amount of configuration space (c-space). The method involves iteratively modifying a connected path between the initial and goal configurations to avoid all intervening obstacles. Information from the world model is used to guide path modification. This approach is of particular value in high-dimensional cases for which exhaustive searches are impractical. In the worst case, the algorithm maps a straight-line path in c-space to the goal and the surfaces of the interfering obstacles along this path. An example for a seven-degree-of-freedom robot is included.

Effect of Shock Loading on the Microstructure of Uniloy 326

1974 ◽  
Vol 32 ◽  
pp. 504-505
Author(s):  
K. P. Staudhammer ◽  
L. E. Murr
Keyword(s):  
Grain Size ◽  
Shock Loading ◽  
Current Investigation ◽  
Two Phase ◽  
05 C ◽  
Shock Deformation ◽  
Heat Treated

The effect of shock loading on a variety of steels has been reviewed recently by Leslie. It is generally observed that significant changes in microstructure and microhardness are produced by explosive shock deformation. While the effect of shock loading on austenitic, ferritic, martensitic, and pearlitic structures has been investigated, there have been no systematic studies of the shock-loading of microduplex structures.In the current investigation, the shock-loading response of millrolled and heat-treated Uniloy 326 (thickness 60 mil) having a residual grain size of 1 to 2μ before shock loading was studied. Uniloy 326 is a two phase (microduplex) alloy consisting of 30% austenite (γ) in a ferrite (α) matrix; with the composition.3% Ti, 1% Mn, .6% Si,.05% C, 6% Ni, 26% Cr, balance Fe.

Exsolution and inversion in pigeonite from the Whin Sill, Northern England

1978 ◽  
Vol 36 (1) ◽  
pp. 474-475
Author(s):  
P.P.K. Smith
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Homogeneous Nucleation ◽  
Silicate Mineral ◽  
Antiphase Boundaries ◽  
Two Phase ◽  
Primitive Form ◽  
The Core ◽  
Nucleation Mechanisms ◽  
And Inversion

Grains of pigeonite, a calcium-poor silicate mineral of the pyroxene group, from the Whin Sill dolerite have been ion-thinned and examined by TEM. The pigeonite is strongly zoned chemically from the composition Wo8En64FS28 in the core to Wo13En34FS53 at the rim. Two phase transformations have occurred during the cooling of this pigeonite:- exsolution of augite, a more calcic pyroxene, and inversion of the pigeonite from the high- temperature C face-centred form to the low-temperature primitive form, with the formation of antiphase boundaries (APB's). Different sequences of these exsolution and inversion reactions, together with different nucleation mechanisms of the augite, have created three distinct microstructures depending on the position in the grain.In the core of the grains small platelets of augite about 0.02μm thick have farmed parallel to the (001) plane (Fig. 1). These are thought to have exsolved by homogeneous nucleation. Subsequently the inversion of the pigeonite has led to the creation of APB's.

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