Design Flow and Methodology for Dynamic and Static Energy-constrained Scheduling Framework in Heterogeneous Multicore Embedded Devices

2021 ◽  
Vol 26 (5) ◽  
pp. 1-18
Author(s):  
Guoqi Xie ◽  
Hao Peng ◽  
Xiongren Xiao ◽  
Yao Liu ◽  
Renfa Li
Keyword(s):  
Integrated Design ◽  
Design Flow ◽  
Embedded Devices ◽  
Parallel Application ◽  
Heterogeneous Multicore ◽  
Framework Design ◽  
Energy Constrained ◽  
Static Energy ◽  
Almost All ◽  
Power And Energy

With Internet of things technologies, billions of embedded devices, including smart gateways, smart phones, and mobile robots, are connected and deeply integrated. Almost all these embedded devices are battery-constrained and energy-limited systems. In recent years, several works used energy pre-assignment techniques to study the dynamic energy-constrained scheduling of a parallel application in heterogeneous multicore embedded systems. However, the existing energy pre-assignment techniques cannot satisfy the actual energy constraint, because it is the joint constraint on dynamic energy and static energy. Further, the modeling and verification of these works are based on the simulations, which have not been verified in real embedded devices. This study aims to propose a dynamic and static energy-constrained scheduling framework in heterogeneous multicore embedded devices. Solving this problem can utilize existing energy pre-assignment techniques, but it requires a deeply integrated design flow and methodology. The design flow consists of four processes: (1) power and energy modeling; (2) power parameter measurement; (3) basic framework design including energy pre-assignment; and (4) framework optimization. Each design flow has corresponding design methodology. Both our theoretical analysis and practical verification using the low-power ODROID-XU4 device confirm the effectiveness of the proposed framework.

scholarly journals Observational estimates of detrainment and entrainment in non-precipitating shallow cumulus

2016 ◽  
Vol 16 (1) ◽  
pp. 21-33 ◽  
Author(s):  
M. S. Norgren ◽  
J. D. Small ◽  
H. H. Jonsson ◽  
P. Y. Chuang
Keyword(s):  
Mixed Layer ◽  
Vertical Transport ◽  
New Method ◽  
Atmospheric Composition ◽  
Cumulus Clouds ◽  
Neutral Buoyancy ◽  
Mass Fractions ◽  
Static Energy ◽  
Almost All ◽  
Entrained Air

Abstract. Vertical transport associated with cumulus clouds is important to the redistribution of gases, particles, and energy, with subsequent consequences for many aspects of the climate system. Previous studies have suggested that detrainment from clouds can be comparable to the updraft mass flux, and thus represents an important contribution to vertical transport. In this study, we describe a new method to deduce the amounts of gross detrainment and entrainment experienced by non-precipitating cumulus clouds using aircraft observations. The method utilizes equations for three conserved variables: cloud mass, total water, and moist static energy. Optimizing these three equations leads to estimates of the mass fractions of adiabatic mixed-layer air, entrained air and detrained air that the sampled cloud has experienced. The method is applied to six flights of the CIRPAS Twin Otter during the Gulf of Mexico Atmospheric Composition and Climate Study (GoMACCS) which took place in the Houston, Texas region during the summer of 2006 during which 176 small, non-precipitating cumuli were sampled. Using our novel method, we find that, on average, these clouds were comprised of 30 to 70 % mixed-layer air, with entrained air comprising most of the remainder. The mass fraction of detrained air was usually very small, less than 2 %, although values larger than 10 % were found in 15 % of clouds. Entrained and detrained air mass fractions both increased with altitude, consistent with some previous observational studies. The largest detrainment events were almost all associated with air that was at their level of neutral buoyancy, which has been hypothesized in previous modeling studies. This new method could be readily used with data from other previous aircraft campaigns to expand our understanding of detrainment for a variety of cloud systems.

Optimization of the internal procurement process at the world's leading producer of phosphate rock

2020 ◽  
Vol 1 (103) ◽  
pp. 33-40
Author(s):  
H. Adlane ◽  
M. Aouane
Keyword(s):  
Field Study ◽  
Phosphate Rock ◽  
Design Methodology ◽  
Storage Space ◽  
Parallel Application ◽  
Internal Customers ◽  
Almost All ◽  
Procurement System ◽  
Procurement Method ◽  
Practical Implications

Purpose: This article discuss the results of a field study that was carried out over a 6 months period. The objective of this research aimed at studying the internal procurement system of one of the world's leading Moroccan companies that has a 4.3% contribution to the national GDP. Design/methodology/approach: Our work, based first of all on the elaboration of an overview and then on the use of more than 6 methods and logistic tools, will allow this company to develop its own procurement method, adapted to its constraints and capacities. Findings: In terms of figures, this company sources 157 items from several suppliers. These references are then stored initially in the company's store, and depending on the demand from internal customers, a distribution is subsequently planned. A shortage of stock on some items and overstocking on others is a blatant contradiction suggesting several paths for improvement. Ultimately, the results of our work have enabled us to reduce financial immobilization by 40%, as well as a considerable gain in storage space. Practical implications: This paper shows the importance of responding to the problems of large companies with adapted and targeted methods. Originality/value: This article presents an original parallel application of almost all conventional logistics methods, for a global and efficient optimization.

scholarly journals Optimum Design of Ship Cabin Equipment Layout Based on SLP Method and Genetic Algorithm

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
Jinghua Li ◽  
Hui Guo ◽  
Shichao Zhang ◽  
Xiaoyuan Wu ◽  
Liuling Shi
Keyword(s):  
Genetic Algorithm ◽  
Design Method ◽  
Integrated Design ◽  
Optimal Solution ◽  
Initial Solution ◽  
Analytic Hierarchy ◽  
Problem Model ◽  
Actual Design ◽  
Electromechanical Equipment ◽  
Almost All

The engine room is the heart of a ship, and almost all of the main electromechanical equipment that supports the work on board can be found here. Finding a way to arrange the equipment in a small cabin space is an essential factor in the design and construction of a ship. However, in existing research, when an intelligent algorithm is used to optimize the design of a cabin, the established mathematical model is not comprehensive and the solution has not been evaluated. The optimal solution obtained is not feasible for the actual design of a ship. This can lead to unnecessary redesign work, which seriously affects design efficiency and increases design costs. In order to solve the above problems, this paper innovatively refers to a Systematic Layout Planning (SLP) method (normally applied to the layout of plant equipment) to the cabin equipment layout issue. The SLP method is used to quantitatively analyze the adjacency and logistics relationship between devices, and the mutual integration relationship between devices is obtained so that a preliminary layout scheme can be retrieved. The problem model is constructed by considering various factors such as the comprehensive relationship between the equipment and the stability of the cabin, and the corresponding objective function and constraint function are established to further design the variables, operators, and steps of the genetic algorithm. The initial solution obtained from the SLP method is used as part of an initial solution to the genetic algorithm, and the genetic algorithm is used to optimize the problem. Finally, the Analytic Hierarchy Process (AHP) is used to evaluate and optimize several groups of better schemes obtained by running multiple genetic algorithms and select the better schemes. The experimental design proves that the integrated design method has certain feasibility and superiority.

Cooperative relay assignment for static energy-constrained networks

2012 ◽  
Vol 11 (3) ◽  
pp. 192 ◽  
Author(s):  
Hongli Xu ◽  
Liusheng Huang ◽  
Zhiji Zhang ◽  
Gang Liu ◽  
Yindong Zhang
Keyword(s):  
Cooperative Relay ◽  
Relay Assignment ◽  
Energy Constrained ◽  
Static Energy

scholarly journals Designing of an Expert system for the management of Seafarer’s health

2020 ◽  
Vol 6 ◽  
pp. 205520762097624
Author(s):  
Gopi Battineni ◽  
Francesco Amenta
Keyword(s):  
Expert System ◽  
Medical Center ◽  
Medical Knowledge ◽  
Epidemiological Data ◽  
Medical Problem ◽  
Design Flow ◽  
Two Phase ◽  
Framework Design ◽  
Medical Issues ◽  
Health Expert

In general merchant ships do not have medical facilities on board. When seafarer got sickness or accident, either ship captain or officers who are in charge will assist them, but these people do not have enough medical knowledge. To overcome this, we developed a Seafarer Health Expert System (SHES) that can facilitate telemedical services in an emergency. A comprehensive analysis of seafarers’ medical issues that were conducted from medical records of patients assisted on board ships by the International Radio Medical Center (C.I.R.M.), Italy. Data mining techniques are involved to manage epidemiological data analysis in a two-phase setup. In the first phase, the common pathologies that occurred onboard were analyzed, later a detailed questionnaire for each medical problem was developed to provide precise symptomatic information to the onshore doctor. In this paper, we mainly highlighted the SHES framework, design flow, and functionality. Besides, nine designing policies and three actors with separate working panels were clearly described. The proposed system is easy and simple to operate for anyone of no computer experience and create medical requests for the fast delivery of symptomatic information to an onshore doctor.

scholarly journals Task-Level Aware Scheduling of Energy-Constrained Applications on Heterogeneous Multi-Core System

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2077
Author(s):  
Kai Huang ◽  
Ming Jing ◽  
Xiaowen Jiang ◽  
Siheng Chen ◽  
Xiaobo Li ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Schedule Algorithm ◽  
Parallel Applications ◽  
Core System ◽  
Parallel Application ◽  
Average Value ◽  
Schedule Length ◽  
Energy Constrained ◽  
Execution Frequency ◽  
Consumption Constraints

Minimizing the schedule length of parallel applications, which run on a heterogeneous multi-core system and are subject to energy consumption constraints, has recently attracted much attention. The key point of this problem is the strategy to pre-allocate the energy consumption of unscheduled tasks. Previous articles used the minimum value, average value or a power consumption weight value as the pre-allocation energy consumption of tasks. However, they all ignored the different levels of tasks. The tasks in different task levels have different impact on the overall schedule length when they are allocated the same energy consumption. Considering the task levels, we designed a novel task energy consumption pre-allocation strategy that is conducive to minimizing the scheduling time and developed a novel task schedule algorithm based on it. After getting the preliminary scheduling results, we also proposed a task execution frequency re-adjustment mechanism that can re-adjust the execution frequency of tasks, to further reduce the overall schedule length. We carried out a considerable number of experiments with practical parallel application models. The results of the experiments show that our method can reach better performance compared with the existing algorithms.

Resilient heterogeneous power and energy constrained computing

2013 ◽  
Vol 5 (1) ◽  
pp. 145-161
Author(s):  
T. M. Lynar ◽  
K. C. B. Steer ◽  
F. Eng ◽  
O. Smith
Keyword(s):  
Energy Constrained ◽  
Power And Energy

Based on Rub a Drum Machine Four-Axis Machining Fixture Design and Modeling in Solidworks and Virtual Assembly

2014 ◽  
Vol 599-601 ◽  
pp. 220-224
Author(s):  
Xuan Lin Ye
Keyword(s):  
Product Development ◽  
Production Process ◽  
Integrated Design ◽  
Virtual Assembly ◽  
Digital Design ◽  
Design Flow ◽  
Machining Process ◽  
Fixture Design ◽  
Development Cycle ◽  
Product Development Cycle

The problem of the actual production process is based on the concentrated four-axis machining process, high machining precision and machining difficulty of rub the drum parts, the author analyzes the four-axis machining fixture design of rub the drum, and then puts forward the method of the four-axis machining fixture design of rub the drum, offering the fixture design flow chart. Taking Solidworks software as a platform, the author makes a analysis of 3D digital design and assembly to rub the drum, fixture and clamping mechanism, completes the virtual assembly with rub the drum, fixture and clamping mechanism, realizing the integrated design, making the structure of the clamp more clearly and shortening the product development cycle.

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