In recent years,the number and size of data centers and cloud storage systems has increased.These two corresponding trends are dra matically increasing energy consumption and disk failure in emerging facilities.This p...In recent years,the number and size of data centers and cloud storage systems has increased.These two corresponding trends are dra matically increasing energy consumption and disk failure in emerging facilities.This paper describes a new chunk-based proportion al-power layout called CPPL to address the issues.Our basic idea is to leverage current proportional-power layouts by using declus tering techniques.In this way,we can manage power at a much finer-grained level.CPPL includes a primary disk group and a large number of secondary disks.A primary disk group contains one copy of available datasets and is always active in order to respond to in coming requests.Other copies of data are placed on secondary disks in declusterd way for power-efficiency and parallel recovery at a finer-grained level.Through comprehensive theoretical proofs and experiments,we conclude that CPPL can save more power and achieve a higher recovery speed than current solutions.展开更多
Recycling of waste electrical and electronic equipment （WEEE） is crucially important since it handles hazardous waste according to ever tightening laws and regulations and it adds benefits to economy and sustainable...Recycling of waste electrical and electronic equipment （WEEE） is crucially important since it handles hazardous waste according to ever tightening laws and regulations and it adds benefits to economy and sustainable environment. Disassembly is one of the most important processes performed during the recovery of WEEE. The overall goal of disassembly is to maximize the retrieval of various metals and plastics contained in WEEE in order to reduce their negative effects on human health and environmental sustainability and to increase economic gains. This study aims to evaluate alternative layout configurations for WEEE disassembly systems （WDS）. In this context, various configurations were compared in terms of pre-defined performance criteria, such as the total number of disassembled WEEE and the total revenue from sales, using simulation models. The results of this study show that the perfomaance of a WDS was significantly affected by output transfer systems along with the specialization of operators on certain types of WEEE.展开更多
This paper surveys the technology used in three-dimensional indoor scene geometry estimation from a single 360°omnidirectional image,which is pivotal in extracting 3D structural information from indoor environmen...This paper surveys the technology used in three-dimensional indoor scene geometry estimation from a single 360°omnidirectional image,which is pivotal in extracting 3D structural information from indoor environments.The technology transforms omnidirectional data into a 3D model,depicting spatial structure,object positions,and scene layout.Its significance spans various domains,including virtual reality(VR),augmented reality(AR),mixed reality(MR),game development,urban planning,and robot navigation.We begin by revisiting foundational concepts of omnidirectional imaging and detailing the problems,applications,and challenges in this field.Our review categorizes the fundamental tasks of structure recovery,depth estimation,and layout recovery.We also review pertinent datasets and evaluation metrics,providing the latest research as a reference.Finally,we summarize the field and discuss potential future trends to inform and guide further research.展开更多
基金supported in part by the US National Science FoundationGrant CCF-0811413,CNS-1115665,CCF-1337244National ScienceFoundation Early Career Award 0953946
文摘In recent years,the number and size of data centers and cloud storage systems has increased.These two corresponding trends are dra matically increasing energy consumption and disk failure in emerging facilities.This paper describes a new chunk-based proportion al-power layout called CPPL to address the issues.Our basic idea is to leverage current proportional-power layouts by using declus tering techniques.In this way,we can manage power at a much finer-grained level.CPPL includes a primary disk group and a large number of secondary disks.A primary disk group contains one copy of available datasets and is always active in order to respond to in coming requests.Other copies of data are placed on secondary disks in declusterd way for power-efficiency and parallel recovery at a finer-grained level.Through comprehensive theoretical proofs and experiments,we conclude that CPPL can save more power and achieve a higher recovery speed than current solutions.
文摘Recycling of waste electrical and electronic equipment （WEEE） is crucially important since it handles hazardous waste according to ever tightening laws and regulations and it adds benefits to economy and sustainable environment. Disassembly is one of the most important processes performed during the recovery of WEEE. The overall goal of disassembly is to maximize the retrieval of various metals and plastics contained in WEEE in order to reduce their negative effects on human health and environmental sustainability and to increase economic gains. This study aims to evaluate alternative layout configurations for WEEE disassembly systems （WDS）. In this context, various configurations were compared in terms of pre-defined performance criteria, such as the total number of disassembled WEEE and the total revenue from sales, using simulation models. The results of this study show that the perfomaance of a WDS was significantly affected by output transfer systems along with the specialization of operators on certain types of WEEE.
基金supported by the National Natural Science Foundation of China(11571325)the State Key Laboratory of Virtual Reality Technology and Systems,Beihang University(VRLAB2023C04)+1 种基金the Fundamental Research Funds for the Central Universities(CUC22GP005,CUC2019A002)Pubic Computing Cloud,CUC.
文摘This paper surveys the technology used in three-dimensional indoor scene geometry estimation from a single 360°omnidirectional image,which is pivotal in extracting 3D structural information from indoor environments.The technology transforms omnidirectional data into a 3D model,depicting spatial structure,object positions,and scene layout.Its significance spans various domains,including virtual reality(VR),augmented reality(AR),mixed reality(MR),game development,urban planning,and robot navigation.We begin by revisiting foundational concepts of omnidirectional imaging and detailing the problems,applications,and challenges in this field.Our review categorizes the fundamental tasks of structure recovery,depth estimation,and layout recovery.We also review pertinent datasets and evaluation metrics,providing the latest research as a reference.Finally,we summarize the field and discuss potential future trends to inform and guide further research.
