Vehicle Relocation Triggering Thresholds Determination in Electric Carsharing System under Stochastic Demand

Vehicle unbalance usually occurs in multistation electric carsharing systems. Threshold triggering method is one of the most practicable approaches for vehicle relocation, while determination of thresholds has not been sufficiently studied particularly for electric carsharing system. This paper presents an approach on determining the thresholds considering the stochastic demands and system states. Firstly, we establish a state transition model involving the stochastic variables to capture the dynamics of the number and battery status of vehicles as well as the traffic demands. Consequently, a dual-objective optimization model was developed to determine the proper values of thresholds. The solution algorithm employed the min–max robust optimization to tackle the uncertainty and the Pareto optimum to decide the solution under dual objectives. To test the distribution stochastic variables, we involve the orders data and the supplementary user survey. Comparison is conducted among three methods: the empirical rules, the deterministic method, and the stochastic method, where the results suggest that the stochastic method achieves better solutions on the dual objectives under stochastic demands.

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Convergence Study on Application of the Over-Deterministic Method for Determination of Near-Tip Fields in a Cracked Plate Loaded in Mixed-Mode

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.249-250.76 ◽

2012 ◽

Vol 249-250 ◽

pp. 76-81 ◽

Cited By ~ 6

Author(s):

Lucie Šestáková ◽

Václav Veselý

Keyword(s):

Mixed Mode ◽

Brittle Materials ◽

Higher Order ◽

Displacement Fields ◽

Deterministic Method ◽

Crack Behavior ◽

Stress And Displacement Fields ◽

Higher Order Terms ◽

Convergence Study

Multi-parameter description of crack behavior in quasi-brittle materials offers still enough space for investigations. Several studies have been carried out by the authors in this field [1-3]. One part of the publications by the authors (this work included) contain analyses of the accuracy, convergence and/or tuning of the over-deterministic method that enables determination of the coefficients of the higher-order terms in Williams expansion approximating the stress and displacement fields in a cracked body without any complicated FE formulations. These intermediate studies should bring together a list of recommendations how to use the ODM as effectively as possible and obtain reliable enough values of coefficients of the higher-order terms. Thus, the stress/displacement field can be determined precisely even in a larger distance from the crack tip, which is crucial for assessment of the fracture occurring in quasi-brittle materials.

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Generation of gait of walking robot based on the multi-objective optimization and determination of walking motion from the Pareto optimum solution set

The Proceedings of Conference of Hokuriku-Shinetsu Branch ◽

10.1299/jsmehs.2017.54.i013 ◽

2017 ◽

Vol 2017.54 (0) ◽

pp. I013

Author(s):

Kenshiro KATAI ◽

Seiya ISHII ◽

Garuda FUJII ◽

Masayuki NAKAMURA

Keyword(s):

Solution Set ◽

Pareto Optimum ◽

Multi Objective Optimization ◽

Walking Robot ◽

Multi Objective ◽

Walking Motion ◽

Pareto Optimum Solution ◽

Optimum Solution

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Probabilistic-Deterministic Method of Rescaling Ship Manoeuvring Simulation Data Defining Parameters of Fairway Bends

New Trends in Production Engineering ◽

10.2478/ntpe-2018-0016 ◽

2018 ◽

Vol 1 (1) ◽

pp. 127-133

Author(s):

Stanisław Gucma ◽

Rafał Gralak

Keyword(s):

Accurate Determination ◽

Scaling Up ◽

Maximum Length ◽

Deterministic Method ◽

Simulation Data ◽

Ship Manoeuvring

Abstract The article presents a method of scaling up existing simulation tests results from ships with parameters L1, B1 (length and breadth) determining a safe waterway bend width (d1) to specify a width (d2) safe for ships with other dimensions L2, B2. This method enables accurate determination of the safe fairway width (d) in case it has been planned to increase maximum length and width of vessels without carrying out relatively expensive simulation tests. The method was used in designing the parameters of the modernized Swinoujscie-Szczecin fairway.

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Investigating the Adequacy of Response Time Outlier Definitions in Computer-Based Web Surveys Using Paradata SurveyFocus

Social Science Computer Review ◽

10.1177/0894439317710450 ◽

2017 ◽

Vol 36 (3) ◽

pp. 369-378 ◽

Cited By ~ 11

Author(s):

Jan Karem Höhne ◽

Stephan Schlosser

Keyword(s):

Response Time ◽

Response Times ◽

Social Research ◽

Web Surveys ◽

Step Procedure ◽

Computer Based ◽

Response Time Distributions ◽

Proper Values ◽

The Web

Web surveys are commonly used in social research because they are usually cheaper, faster, and simpler to conduct than other modes. They also enable researchers to capture paradata such as response times. Particularly, the determination of proper values to define outliers in response time analyses has proven to be an intricate challenge. In fact, to a certain degree, researchers determine them arbitrarily. In this study, we use “SurveyFocus (SF)”—a paradata tool that records the activity of the web-survey pages—to assess outlier definitions based on response time distributions. Our analyses reveal that these common procedures provide relatively sufficient results. However, they are unable to detect all respondents who temporarily leave the survey, causing bias in the response times. Therefore, we recommend a two-step procedure consisting of the utilization of SF and a common outlier definition to attain a more appropriate analysis and interpretation of response times.

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A Descriptive Geometry-Based Solution to a Geometrical Problem in Rotary Shaving of a Shoulder Pinion

Journal of Manufacturing Science and Engineering ◽

10.1115/1.2039104 ◽

2005 ◽

Vol 127 (4) ◽

pp. 893-900 ◽

Cited By ~ 3

Author(s):

Stephen P. Radzevich

Keyword(s):

Descriptive Geometry ◽

Limiting Factors ◽

Pivot Point ◽

Geometrical Problem ◽

Face Width ◽

And Migration ◽

Proper Values ◽

Outside Diameter

A novel descriptive-geometry-based (DGB) approach for determining of limitation on parameters of rotary shaving operation of shoulder gear is reported in the paper. The paper covers determination: (a) of the maximum feasible outside diameter of the shaving cutter; (b) of the minimum required overlap in rotary shaving operation; and (c) of the minimum required face-width of the shaving cutter. Insufficiency of location, and migration of the pivot point is investigated as well. It is proven that instead of consideration of the pivot point itself, it is required to consider size and relative disposition of the auxiliary rack of the pinion, and of the auxiliary rack of the shaving cutter. The developed solution is the exact and not an approximate one. Due to that it is still valid for any value of the crossed-axis angle, even in cases where it exceeds 10 deg. The results are valid for all four basic methods of rotary shaving. Application of the results enables avoiding of the pinion tooth bias. Taken as a whole, the topic covered in this paper will enable one determination of proper values of parameters (a) through (c) of rotary shaving operation, which are the dominating limiting factors of rotary shaving operation. The developed DGB approach can be readily put into practice.

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A Deterministic Method of Application Region of Clamping Forces for Fixture Design

Materials Science Forum ◽

10.4028/www.scientific.net/msf.697-698.345 ◽

2011 ◽

Vol 697-698 ◽

pp. 345-348

Author(s):

X.Y. Guo ◽

Guo Hua Qin ◽

Hai Chao Ye

Keyword(s):

Screw Theory ◽

Deterministic Algorithm ◽

Fixture Design ◽

Clamping Force ◽

Discretization Method ◽

Deterministic Method ◽

Analysis Algorithm ◽

Production Safety ◽

Workpiece Stability

After being located, cutting force and torques will exert on a workpiece during the machining operation. In order to guarantee the location accuracy and production safety, the feasible clamping forces must be planned to stabilize the workpiece in the entire processing. Therefore, the workpiece stability is taken as a core to create a deterministic algorithm to the application region of clamping forces for the complex workpiece. Firstly, on the basis of the combination of the screw theory with the linear programming technology, an analysis algorithm is subjected to judge the workpiece stability. Secondly, according to the surface discretization method, a deterministic algorithm is further established to plan the application region of clamping force by analyzing the workpiece stability at all nodes in sequence. The proposed method can be utilized for the determination of the application region of clamping forces as well as the verification of the feasibility of the magnitudes of clamping forces.

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Determination of the crystal structure and composition of Li6Be4OH12 by the stochastic method.

Proceedings of the National Academy of Sciences ◽

10.1073/pnas.87.1.244 ◽

1990 ◽

Vol 87 (1) ◽

pp. 244-245 ◽

Cited By ~ 3

Author(s):

L. Pauling

Keyword(s):

Crystal Structure ◽

Stochastic Method

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A comparison between Gauss-Newton and Markov-chain Monte Carlo–based methods for inverting spectral induced-polarization data for Cole-Cole parameters

Geophysics ◽

10.1190/1.2976115 ◽

2008 ◽

Vol 73 (6) ◽

pp. F247-F259 ◽

Cited By ~ 65

Author(s):

Jinsong Chen ◽

Andreas Kemna ◽

Susan S. Hubbard

Keyword(s):

Monte Carlo ◽

Markov Chain ◽

Markov Chain Monte Carlo ◽

Optimal Solution ◽

Stochastic Method ◽

Objective Functions ◽

Unknown Parameters ◽

Deterministic Method ◽

Initial Values ◽

Spectral Induced Polarization

We have developed a Bayesian model to invert spectral induced-polarization (SIP) data for Cole-Cole parameters using Markov-chain Monte Carlo (MCMC) sampling methods. We compared the performance of the MCMC-based stochastic method with an iterative Gauss-Newton-based deterministic method for Cole-Cole parameter estimation through inversion of synthetic and laboratory SIP data. The Gauss-Newton-based method can provide an optimal solution for given objective functions under constraints, but the obtained optimal solution generally depends on the choice of initial values and the estimated uncertainty information often is inaccurate or insufficient. In contrast, the MCMC-based inversion method provides extensive globalinformation on unknown parameters, such as the marginal probability distribution functions, from which we can obtain better estimates and tighter uncertainty bounds of the parameters than with the deterministic method. In addition, the results obtained with the MCMC method are independent of the choice of initial values. Because the MCMC-based method does not explicitly offer a single optimal solution for given objective functions, the deterministic and stochastic methods can complement each other. For example, the stochastic method can be used first to obtain the medians of unknown parameters by starting from an arbitrary set of initial values. The deterministic method then can be initiated using the medians as starting values to obtain the optimal estimates of the Cole-Cole parameters.

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