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Lane changing assistance strategy based on an improved probabilistic model of dynamic occupancy grids Research Articles

Zhengcai Yang, Zhenhai Gao, Fei Gao, Xinyu Wu, Lei He,gaozh@jlu.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 11,   Pages 1492-1504 doi: 10.1631/FITEE.2000439

Abstract: in autonomous vehicles is a popular research topic. Scene modeling of the driving area is a prerequisite for lane changing decision problems. A road environment representation method based on a dynamic occupancy grid is proposed in this study. The model encapsulates the data such as vehicle speed, obstacles, lane lines, and traffic rules into a form of spatial drivability probability. This information is compiled into a hash table, and the grid map is mapped into a hash map by means of hash function. A vehicle behavior decision cost equation is established with the model to help drivers make accurate vehicle lane changing decisions based on the principle of least cost, while considering influencing factors such as vehicle drivability, safety, and power. The feasibility of the strategy is verified through vehicle tests, and the results show that the system based on a of dynamic can provide to drivers taking into consideration the dynamics and safety.

Keywords： 占用网格；概率模型；换道辅助    

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Image meshing via hierarchical optimization

Hao XIE,Ruo-feng TONG

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 1,   Pages 32-40 doi: 10.1631/FITEE.1500171

Abstract:

Vector graphic, as a kind of geometric representation of raster images, has many advantages, e.g., definition independence and editing facility. A popular way to convert raster images into vector graphics is image meshing, the aim of which is to find a mesh to represent an image as faithfully as possible. For traditional meshing algorithms, the crux of the problem resides mainly in the high non-linearity and non-smoothness of the objective, which makes it difficult to find a desirable optimal solution. To ameliorate this situation, we present a hierarchical optimization algorithm solving the problem from coarser levels to finer ones, providing initialization for each level with its coarser ascent. To further simplify the problem, the original non-convex problem is converted to a linear least squares one, and thus becomes convex, which makes the problem much easier to solve. A dictionary learning framework is used to combine geometry and topology elegantly. Then an alternating scheme is employed to solve both parts. Experiments show that our algorithm runs fast and achieves better results than existing ones for most images.

Keywords： Image meshing     Hierarchical optimization     Convexification    

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Collaborative Virtual Environment Based on Grid Service

Zhang Xu,Wu Huizhong,Xiao Liang

Strategic Study of CAE 2007, Volume 9, Issue 11,   Pages 157-162

Abstract:

Limited by computing resource, network resource and today's technologies, the scalability of collaborative virtual environment(CVE)has not been efficiently solved until now. The paper discusses the communication model of large-scale CVE first and then devises a CVE architecture based on open grid services architecture(OGSA). Utilizing grid service the CVE architecture separates CVE function realizations from physical resource to solve the scalability of CVE. In addition, the paper focuses on the research of virtual world management service and some related services such as interest management service, consistency management service and concurrent management service which are key issues to solve the scalability of CVE. At last, a CVE case based on Globus Toolkit is developed to validate the feasibility of the proposed CVE architecture and methods.

Keywords： collaborative virtual environment     open grid services architecture     virtual world management     scalability    

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An Immune Agent-based Performance Rejuvenation for Grid

Xu Jian,Zhang Kun, Liu Fengyu

Strategic Study of CAE 2007, Volume 9, Issue 11,   Pages 87-91

Abstract:

Simulating biological immune mechanism to implement performance rejuvenation is a new research approach for computing grid.  This paper analyzes and compares the immune process's characteristics and computing system's rejuvenation,  sets up the logical model of system rejuvenation based on immune agent above simulates the biological immune mechanisms to monitor resource usage and diagnose performance degradation, constructs the mathematics model,  then puts forward a method to make decision for rejuvenation policy.  On the basis of above an application regarding audio-video resource transaction process system as background is studied,  a two-stage hyper-exponential model is proposed to evaluate system performance.  The results of case study indicate that this method is effective and feasible.

Keywords： grid     immune system     performance monitoring     software rejuvenation     immune agent    

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Design and Implementation of Traceability System of Agricultural Product Quality and Safety Based on Grid Management

Hu Yunfeng,Dong Yu,Sun Jiulin

Strategic Study of CAE 2018, Volume 20, Issue 2,   Pages 63-71 doi: 10.15302/J-SSCAE-2018.02.010

Abstract:

In recent years, consumers have expressed higher requirements on the source and quality of agricultural products; purchased agricultural products need more traceability and their nutritional value characteristics need to be understood. Taking the production of wolfberry in Zhongning County as an example, the authors use a series of techniques and methods in spatial analysis, data grid, cloud computing, and mobile Internet to implement across the three dimensions of width, depth, and accuracy of the food traceability system. Leveraging and improving on the key technologies of localization and map display, data grid, early warning service and push notifications, two-dimensional code association, and back-tracing, the authors form a quality and safety traceability system of agricultural products that covers the entire process of agricultural production. Through the process of system construction and application demonstration, the system is generally shown to meet the crop quality needs of producers, managers, and consumers. In future, this system may be expanded to the quality and safety traceability business of all agricultural products. Additionally, further study can facilitate the establishment of a unified traceability standard at the national level.

Keywords： gridding     agricultural product     quality safety     traceability hierarchy     back-tracing system    

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Appication of digital photogrammetry grid in the fast response for Wenchuan Earthquake rescue

Zhang Zuxun,Ke Tao,Guo Dahai,Wang Jianchao

Strategic Study of CAE 2009, Volume 11, Issue 6,   Pages 54-62

Abstract:

The aerial photogrammetry is the main method of surveying and mapping, and it can mosaic thousands of aerial images into the ortho-image and provide us detailed information about the disaster area. But the traditional Digital Photogrammetry Workstation (DPW) is based on serial computing and cannot process the unconventional aerial photogrammetry data, so it cannot meet the needs of high production efficiency and rapid respond. The paper introduces the application of Digital Photogrammetry Grid System in the fast response for China earthquake rescue, and discusses its distributed computing technique and key analyses method for unconventional aerial photogrammetry data.

Keywords： aerial photogrammetry     DPGrid     China earthquake rescue     fast response    

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Efficientmesh denoising via robust normal filtering and alternate vertex updating Article

Tao LI, Jun WANG, Hao LIU, Li-gang LIU

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 11,   Pages 1828-1842 doi: 10.1631/FITEE.1601229

Abstract: The most challenging problem in mesh denoising is to distinguish features from noise. Based on the robust guided normal estimation and alternate vertex updating strategy, we investigate a new feature-preserving mesh denoising method. To accurately capture local structures around features, we propose a corner-aware neighborhood (CAN) scheme. By combining both overall normal distribution of all faces in a CAN and individual normal influence of the interested face, we give a new consistency measuring method, which greatly improves the reliability of the estimated guided normals. As the noise level lowers, we take as guidance the previous filtered normals, which coincides with the emerging rolling guidance idea. In the vertex updating process, we classify vertices according to filtered normals at each iteration and reposition vertices of distinct types alternately with individual regularization constraints. Experiments on a variety of synthetic and real data indicate that our method adapts to various noise, both Gaussian and impulsive, no matter in the normal direction or in a random direction, with few triangles flipped.

Keywords： Mesh denoising     Guided normal filtering     Alternate vertex updating     Corner-aware neighborhoods    

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Advances in Numerical Simulation of Demolition Blasting

Xie Xianqi,Liu Jun,Jia Yongsheng,Sun Jinshan

Strategic Study of CAE 2014, Volume 16, Issue 11,   Pages 20-27

Abstract:

The applications of numerical simulation in demolition blasting were commented. The mainly methods of numerical simulation in demolition blasting were reviewed. The advantages and disadvantages of the numerical methods mentioned in this paper were also indicated, respectively. Furthermore, the solid lattice model in the frame of DEM, which was developed by the author together with his group, was detailed illustrated. The existed problems in the current numerical simulation methods of demolition blasting were presented and the trend of the further development was finally forecasted.

Keywords： demolition blasting     numerical simulation     discrete element method     solid lattice model    

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Development of Digital Airspace System

Zhu Yongwen, Chen Zhijie, Pu Fan, Wang Jialong

Strategic Study of CAE 2021, Volume 23, Issue 3,   Pages 135-143 doi: 10.15302/J-SSCAE-2021.03.018

Abstract:

The development of smart space and its technical system has expanded the traditional cognition of physical space-time domain. Time and space are essentially integrated and continuous, and they overlap with the information space. The organic integration of the space-time domain with the information space can enable information technology to further its control over the physical space. To address the problems of and needs for airspace management, we propose a digital airspace system and construct a four-dimensional air traffic space-time framework in a physical–information fusion space, realizing the digital reconstruction of airspace management. Furthermore, a set of control theories and methods for digital airspace management is developed. Large-scale computing technology is utilized for analyzing the operating structure and control mode of the digital airspace system, also for decision making and use configuration, thereby laying a theoretical foundation for the coordination of airspace, air traffic flow, and air traffic control. Moreover, we propose suggestions for the development of the digital airspace system in China. A national plan for airspace system development should be formulated to coordinate the civil and military air traffic infrastructure construction. The scientific and technological innovation mechanism should be improved to build an innovation platform for the national airspace system. The overall coordination and resource integration of air traffic control innovation should be strengthened to improve the research and innovation plan for airspace management.

Keywords： air traffic management     digital airspace system     digital grid     delicacy airspace management    

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High End Computing in China and the Exploration of “Sunway” Computers

Chen Zuoning

Strategic Study of CAE 2004, Volume 6, Issue 9,   Pages 23-28

Abstract:

In the beginning of the 21st century, driven by application requirements, the research and development of HEC are getting a new upsurge both in China and abroad. This paper analyses the development status and trends of international HEC, describes the overall development and application status of HEC in China, introduces the major technical features and application achievements of Sunway series high-performance computers; discusses the problems faced by today's HEC technologies, and finally makes some suggestions on how to extend progress in the HEC industry in China.

Keywords： high-end computing     grid computing     high performance service     high productivity computing     total cost of ownership     Sunway series computers    

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Performance analysis of the stop-and-wait automatic repeat request protocol under Markovian interruptions Regular Papers-Research Articles

Dashdondov KHONGORZUL, Yong-Ki KIM, Mi-Hye KIM

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 9,   Pages 1296-1306 doi: 10.1631/FITEE.1700185

Abstract: The performance of an integrated packet voice/data multiplexer using a stop-and-wait (SW) automatic repeat request (ARQ) protocol is discussed. We assume that the input for the data traffic is exponentially distributed in increments via the Poisson process, with each data packet transmitted within an individual slot time. Another assumption is that there is only a single voice signal, which has a higher priority over the data packet, and whose traffic is given via an on-off Markov process. Whenever the voice signal is active, the output link is used and will be blocked for the data packet. We introduce the concept of buffer occupancy to simplify the analysis, and discover that data multiplexers using the SW ARQ protocol exhibit a behavior of queueing delay and buffering when the interruption signal is given via a Markov process. Simulation results verify the validity of the analytical results.

Keywords： Stop-and-wait ARQ protocol     Markovian interruptions     Poisson distribution     Buffer occupancy     Waiting time    

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Gaze Estimation via a Differential Eyes’ Appearances Network with a Reference Grid Article

Song Gu, Lihui Wang, Long He, Xianding He, Jian Wang

Engineering 2021, Volume 7, Issue 6,   Pages 777-786 doi: 10.1016/j.eng.2020.08.027

Abstract:

A person’s eye gaze can effectively express that person’s intentions. Thus, gaze estimation is an important approach in intelligent manufacturing to analyze a person’s intentions. Many gaze estimation methods regress the direction of the gaze by analyzing images of the eyes, also known as eye patches. However, it is very difficult to construct a person-independent model that can estimate an accurate gaze direction for every person due to individual differences. In this paper, we hypothesize that the difference in the appearance of each of a person’s eyes is related to the difference in the corresponding gaze directions. Based on this hypothesis, a differential eyes’ appearances network (DEANet) is trained on public datasets to predict the gaze differences of pairwise eye patches belonging to the same individual. Our proposed DEANet is based on a Siamese neural network (SNNet) framework which has two identical branches. A multi-stream architecture is fed into each branch of the SNNet. Both branches of the DEANet that share the same weights extract the features of the patches; then the features are concatenated to obtain the difference of the gaze directions. Once the differential gaze model is trained, a new person’s gaze direction can be estimated when a few calibrated eye patches for that person are provided. Because personspecific calibrated eye patches are involved in the testing stage, the estimation accuracy is improved. Furthermore, the problem of requiring a large amount of data when training a person-specific model is effectively avoided. A reference grid strategy is also proposed in order to select a few references as some of the DEANet’s inputs directly based on the estimation values, further thereby improving the estimation accuracy. Experiments on public datasets show that our proposed approach outperforms the state-of-theart methods.

Keywords： Gaze estimation     Differential gaze     Siamese neural network     Cross-person evaluations     Human–robot collaboration    

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Research and Application of Technologies for Complex System (Product) Integrated Manufacturing Engineering

Xia Guohong,Li Bohu,Tang Xiaoqing ,Zhu Wenhai,Chai Xudong

Strategic Study of CAE 2005, Volume 7, Issue 9,   Pages 49-55

Abstract:

Based on the theories, methods, technologies and tools of contemporary integrated manufacturing, the Complex System (Product) Integrated Manufacturing Engineering (COSIME) is presented and researched, aiming to improve the T (Time to market), Q (Quality), C (Cost), S (Service) of the complex product development. The connotation, system framework and technology system of COSIME are given. Furthermore, the phased research results of six key technologies are introduced： (1) the management mode of the complex product integrated manufacturing system based on the theory of the ” management of person with ability and institution” and the advanced manufacture patterns; (2) the concurrent engineering methods and techniques for the enterprises dispersed at different sites based on the theory of the project management; (3) the means and technologies of the virtual prototyping engineering for complex product; (4) the concept design and performance evaluation system for complex product based on the advanced distributed interactive simulation technology; (5) the quality control and management system for complex product; (6) the two integrated manufacturing infrastructures for the all lifecycle activities of complex product based on PLM and the grid computing technologies.

Keywords： complex system integration manufacturing engineering     virtual prototyping engineering for complex product     grid computing     management of person with ability and institution    

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Development of new systems of reinforced concrete　spatial grid structure in China

Ma Kejian,Zhang Huagang,Xiao Jianchun,Lu Yaqin

Strategic Study of CAE 2008, Volume 10, Issue 8,   Pages 22-34

Abstract:

Reinforced concrete spatial grid structure includes planar open-web grid structure, open-web sandwich plate structure, open-web dual grid structure, cast-in-place concrete round eye hollow plate structure, these new structure systems have been applied in the plate of public buildings amount to more than 1 million square meters from the 1980s until now, and obtained the excellent social and economic efficiency. The corresponding technical specifications for some have been established. In recent years, we have developed the reinforced concrete open-web sandwich shell and arch structure through bending the reinforced concrete open-web sandwich plate structure by one direction,and the reinforced concrete open-web sandwich hyperbolic flat shell structure through bending the reinforced concrete open-web sandwich plate structure by the two directions These new spatial grid structure systems have the proprietary intellectual property rights of our country and have their own characteristic and the compatibility for the buildings. In the paper, we will introduce one by one successively according to the development time order. The security and rationality and efficiency and advancement of the structure will be analyzed through the project examples.

Keywords： reinforced concrete     open-web sandwich plate     cast-in-place concrete round eye hollow plate     grid structure     shell structure    

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ARAP++: an extension of the local/global approach tomesh parameterization 1 Project supported by the National Natural Science Foundation of China (Nos. 61432003, 61572105, 11171052, and 61328206) Article

Zhao WANG,Zhong-xuan LUO,Jie-lin ZHANG,Emil SAUCAN

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 6,   Pages 501-515 doi: 10.1631/FITEE.1500184

Abstract: Mesh parameterization is one of the fundamental operations in computer graphics (CG) and computeraided design (CAD). In this paper, we propose a novel local/global parameterization approach, ARAP++, for singleand multi-boundary triangular meshes. It is an extension of the as-rigid-as-possible (ARAP) approach, which stitches together 1-ring patches instead of individual triangles. To optimize the spring energy, we introduce a linear iterative scheme which employs convex combination weights and a fitting Jacobian matrix corresponding to a prescribed family of transformations. Our algorithm is simple, efficient, and robust. The geometric properties (angle and area) of the original model can also be preserved by appropriately prescribing the singular values of the fitting matrix. To reduce the area and stretch distortions for high-curvature models, a stretch operator is introduced. Numerical results demonstrate that ARAP++ outperforms several state-of-the-art methods in terms of controlling the distortions of angle, area, and stretch. Furthermore, it achieves a better visualization performance for several applications, such as texture mapping and surface remeshing.

Keywords： Mesh parameterization     Convex combination weights     Stretch operator     Jacobian matrix    

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Title Author Date Type Operation

Lane changing assistance strategy based on an improved probabilistic model of dynamic occupancy grids

Zhengcai Yang, Zhenhai Gao, Fei Gao, Xinyu Wu, Lei He,gaozh@jlu.edu.cn

Journal Article

Image meshing via hierarchical optimization

Hao XIE,Ruo-feng TONG

Journal Article

Collaborative Virtual Environment Based on Grid Service

Zhang Xu,Wu Huizhong,Xiao Liang

Journal Article

An Immune Agent-based Performance Rejuvenation for Grid

Xu Jian,Zhang Kun, Liu Fengyu

Journal Article

Design and Implementation of Traceability System of Agricultural Product Quality and Safety Based on Grid Management

Hu Yunfeng,Dong Yu,Sun Jiulin

Journal Article

Appication of digital photogrammetry grid in the fast response for Wenchuan Earthquake rescue

Zhang Zuxun,Ke Tao,Guo Dahai,Wang Jianchao

Journal Article

Efficientmesh denoising via robust normal filtering and alternate vertex updating

Tao LI, Jun WANG, Hao LIU, Li-gang LIU

Journal Article

Advances in Numerical Simulation of Demolition Blasting

Xie Xianqi,Liu Jun,Jia Yongsheng,Sun Jinshan

Journal Article

Development of Digital Airspace System

Zhu Yongwen, Chen Zhijie, Pu Fan, Wang Jialong

Journal Article

High End Computing in China and the Exploration of “Sunway” Computers

Chen Zuoning

Journal Article

Performance analysis of the stop-and-wait automatic repeat request protocol under Markovian interruptions

Dashdondov KHONGORZUL, Yong-Ki KIM, Mi-Hye KIM

Journal Article

Gaze Estimation via a Differential Eyes’ Appearances Network with a Reference Grid

Song Gu, Lihui Wang, Long He, Xianding He, Jian Wang

Journal Article

Research and Application of Technologies for Complex System (Product) Integrated Manufacturing Engineering

Xia Guohong,Li Bohu,Tang Xiaoqing ,Zhu Wenhai,Chai Xudong

Journal Article

Development of new systems of reinforced concrete　spatial grid structure in China

Ma Kejian,Zhang Huagang,Xiao Jianchun,Lu Yaqin

Journal Article

ARAP++: an extension of the local/global approach tomesh parameterization 1 Project supported by the National Natural Science Foundation of China (Nos. 61432003, 61572105, 11171052, and 61328206)

Zhao WANG,Zhong-xuan LUO,Jie-lin ZHANG,Emil SAUCAN

Journal Article