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Journal articles on the topic 'Degree of obstacle'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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1

Abardeh, Mahdi Esmaeilzadeh, and Alireza Akbarzadeh. "Online Trajectory Generation of a 2 Link Robot in Presence of Obstacle." Advanced Materials Research 488-489 (March 2012): 1772–76. http://dx.doi.org/10.4028/www.scientific.net/amr.488-489.1772.

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Online coordination of multiple robots working on a single workstation requires special attention. In these applications it is generally necessary that the robot arm follow a desired path in workspace so that it does not crash with any obstacle or the other robots. In this paper a two link planar robot crossing a rectangular obstacle is considered. The proposed idea is to define the relationship between obstacle's dimensions and the required joints trajectories parameters which allow the robot to reach its destination in the presence of an obstacle. First, the desired path for robot avoiding t

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2

Wang, Yubo, Yuyu Xue, and Jianchao Xi. "Inter-Provincial Differences in Potential Obstacles to Land Transfer Income to Support Rural Revitalization in China." Land 11, no. 4 (2022): 510. http://dx.doi.org/10.3390/land11040510.

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This study analyzes the triple path obstacles of land transfer income in supporting rural revitalization under the premise of existing policy support. It is innovative to try to de-qualitatively analyze the obstacle factors and quantitatively measure the degree of obstacles. We examined the potential obstacles to land transfer income supporting rural revitalization in China, measured the potential comprehensive obstacle degree of 31 provincial-level administrative divisions’ land transfer income supporting rural revitalization, and constructed a way to resolve the differences. We employed inte

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3

Morse, A. S. "Overcoming the Obstacle of High Relative Degree." European Journal of Control 2, no. 1 (1996): 29–35. http://dx.doi.org/10.1016/s0947-3580(96)70025-0.

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Nagase, Kazuyuki, and Yasumichi Aiyama. "Grasp Motion Planning with Redundant DOF of Grasping Pose." Journal of Robotics and Mechatronics 25, no. 3 (2013): 538–44. http://dx.doi.org/10.20965/jrm.2013.p0538.

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In this paper, we propose a new method of grasp planning for a manipulator with a parallel jaw gripper in obstacle environment. We consider collision avoidance as a problem of motion planning in obstacle environments. In general, however, a redundant degree of freedom (DOF) is required to avoid obstacle and to grasp. In our proposal, we pay attention to redundant DOF in a grasping pose. Using redundant DOF in a grasping pose, a manipulator can avoid obstacles and grasp a target object. It does not require any redundant manipulators.

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Kadam, Suraj S. "Mixing Behavior and Pressure Drop Analysis of Micromixer with Different Geometric Conditions." International Journal for Research in Applied Science and Engineering Technology 9, no. VI (2021): 2008–16. http://dx.doi.org/10.22214/ijraset.2021.35393.

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A 3-D design of and analysis of fluid flow in the micromixer with different configurations is carried out in this dissertation. The main purpose of this research is to obtain minimum mixing length as rapid mixing is essential in many of the micro-fluidic systems used in biochemistry analysis, drug delivery, sequencing, or synthesis of nucleic acids. Also effect on various parameters such as mixing behavior, volume arrow, mixing length, maximum velocity, maximum pressure, pressure drop, and velocity distribution were analyzed by changing the mixing angle between inlets. Micromixers with square

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6

Qin, Yun, Jinlong Xu, Hexiong Zhang, and Wenqin Ren. "The Measurement of the Urban–Rural Integration Level of Resource-Exhausted Cities—A Case Study of Zaozhuang City, China." Sustainability 15, no. 1 (2022): 418. http://dx.doi.org/10.3390/su15010418.

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Urban–rural integration is an inevitable course for the transformation and development of resource-exhausted cities, and it is also an internal requirement to achieve sustainable development goals. Taking Zaozhuang city as a case study, this paper constructed an “Economic–Spatial–Social” (ESS) evaluation index system of urban–rural integration according to the connotations. We used the TOPSIS and obstacle degree (OD) models to measure the urban–rural integration level, from 2009 to 2019, and diagnosed the obstacles. The results show that: (1) The overall level of urban–rural integration in Zao

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Hao, Yu, Chen Wang, Chaolun Sun, and Delin Liu. "Evaluation and Spatial–Temporal Pattern Evolution of Synergy Degree of Emergency Management for Urban Flood Disasters from the Perspective of Sustainable Development—The Case of Henan, China." Sustainability 16, no. 11 (2024): 4730. http://dx.doi.org/10.3390/su16114730.

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The management of urban flood disasters is a systematic engineering project that requires a great amount of manpower, material resources, and financial resources, and the interaction and coordination degrees of various elements in the system deeply affect the efficiency of the final governance. According to the theories of synergy, composite systems, and sustainable development, this research first established an evaluation index system to determine the synergy degree of urban flood disaster emergency management from the four dimensions of prevention and preparation, monitoring and early warni

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Xiao, Shuai, Tao Wang, Shuhua Zhang, Shijun Zhang, and Jingjing Liang. "An obstacle avoidance scheme for space manipulator based on adjusting spacecraft attitude at minimum angles." Journal of Physics: Conference Series 2996, no. 1 (2025): 012006. https://doi.org/10.1088/1742-6596/2996/1/012006.

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Abstract To solve the obstacle avoidance problem of the degenerated six-degree-of-freedom (6-DOF) space manipulator system, this paper proposes an obstacle avoidance scheme for space manipulators based on adjusting spacecraft attitude at minimum angles. During the motion of the space manipulator, if a potential collision of obstacles is detected, the attitude angles of the spacecraft are cooperatively adjusted at minimum angles to bypass the obstacle, and the end-effector of the manipulator can continue to move along the predetermined trajectory. In this way, the floating attribute of the spac

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9

Han, Yanan, Jianfeng Gao, Yang Wu, Xiaojun Shao, and Shuxuan Peng. "Experimental and LES Study of H2/CH4 Premixed Gas Deflagration Under Different Obstacle Conditions." Applied Sciences 14, no. 23 (2024): 10843. http://dx.doi.org/10.3390/app142310843.

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To study the influence of obstacles on the premixed gas explosion process and provide a theoretical basis for the safe use of fuel and the space configuration within weakly constrained structures, experimental and numerical simulation studies were conducted to investigate the explosion behavior of H2/CH4 premixed gas under different obstacle conditions. According to the angle and position of obstacles, 12 explosion working conditions were set up, and the flame kinetic behavior under the combined influence was obtained. The results show that increasing the direct contact area between the obstac

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10

Vollmerhausen, Richard H. "Small Obstacle Avoidance Sensor." Scientific World Journal 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/604538.

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This paper describes a laser ranging sensor that is suitable for applications like small unmanned aerial vehicles. The hardware consists of a diode emitter array and line-scan charge coupled devices. A structured-light technique measures ranges up to 30 meters for 64 field angles in a 90 degree field of view. Operation is eye safe, and the laser wavelength is not visible to night vision goggles. This paper describes a specific sensor design in order to illustrate performance for a given package size.

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Xie, Desheng, Youchun Xu, and Rendong Wang. "Obstacle detection and tracking method for autonomous vehicle based on three-dimensional LiDAR." International Journal of Advanced Robotic Systems 16, no. 2 (2019): 172988141983158. http://dx.doi.org/10.1177/1729881419831587.

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The movement state of obstacle including position, velocity, and yaw angle in the real traffic scenarios has a great impact on the path planning and decision-making of autonomous vehicle. Aiming at how to get the obstacle’s movement state in the real traffic scenarios, an approach is proposed to detect and track obstacle based on three-dimensional Light Detection And Ranging (LiDAR). Firstly, the point-cloud data produced by three-dimensional LiDAR after the road segmentation is rasterized, and the reuse of useful non-obstacle cells is carried out on the basis of the rasterized point-cloud dat

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12

Ci, Wenyan, Tianxiang Xu, Runze Lin, and Shan Lu. "A Novel Method for Unexpected Obstacle Detection in the Traffic Environment Based on Computer Vision." Applied Sciences 12, no. 18 (2022): 8937. http://dx.doi.org/10.3390/app12188937.

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Obstacle detection is the basis for the Advanced Driving Assistance System (ADAS) to take obstacle avoidance measures. However, it is a very essential and challenging task to detect unexpected obstacles on the road. To this end, an unexpected obstacle detection method based on computer vision is proposed. We first present two independent methods for the detection of unexpected obstacles: a semantic segmentation method that can highlight the contextual information of unexpected obstacles on the road and an open-set recognition algorithm that can distinguish known and unknown classes according t

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13

ruhan, A., and Dongchang Liu. "Research on the carrying capacity of production, living and ecological space and its coupling coordination in Duolun County, Inner Mongolia." PLOS ONE 19, no. 12 (2024): e0309615. https://doi.org/10.1371/journal.pone.0309615.

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To offer a foundational science for the land spatial planning of Beijing Tianjin sandstorm source area, the remote sensing images of Duolun County in Inner Mongolia from 2000 to 2020 were used to obtain the spatial information of production, living and ecological space(PLES). In order to construct the index system of the carrying capacity of the PLES, 24 indicators were chosen from the perspectives of ecological space, living space, and production space. AHP method, TOPSIS Model with entropy combination weight, coupling coordination model and obstacle degree model are used to analyze the coupl

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Yang, Yaliu, Fagang Hu, Ling Ding, and Xue Wu. "Coupling Coordination Analysis of Regional IEE System: A Data-Driven Multimodel Decision Approach." Processes 10, no. 11 (2022): 2268. http://dx.doi.org/10.3390/pr10112268.

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Coordinating regional innovation–economy–ecology (IEE) systems is an important prerequisite for overall continuous regional development. To fully understand the coordination relationship among the three, this study builds a data-driven multimodel decision approach to calculate, assess, diagnose, and improve the regional IEE system. First, the assessment indicator system of the regional IEE system is established. Secondly, the range method, entropy weight method, and weighted summation method are employed to calculate the synthetic developmental level. Thirdly, a multimodel decision approach in

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15

Iman, Hafiz, and Md Raisuddin Khan. "Repurposing A Sampling-Based Planner for A Six-Degree-Of-Freedom Manipulator to Avoid Unpredictable Obstacles." IIUM Engineering Journal 24, no. 1 (2023): 319–32. http://dx.doi.org/10.31436/iiumej.v24i1.2642.

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This paper presents the use of a sampling-based planner as a reactive planning scheme to avoid obstacles between a robotic arm and a moving obstacle. Based on a planner benchmark on an obstacle-ridden environment, a rapidly-exploring random tree (RRT) planner has been used to populate the trajectories of the task space and map them into a configuration space using a Newton-Raphson-based inverse kinematic solver. Two robot poses are defined in a cycle of back-and-forth motion; the initial and the goal poses. The robot repeatedly moves from the starting pose to the end pose via the midpoint pose

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16

Zhong, Sheng, and Mingting Shi. "Evaluation and Obstacle Factors of Renewable Energy Substitution Potential in Underdeveloped Rural Areas of China." Sustainability 17, no. 3 (2025): 1315. https://doi.org/10.3390/su17031315.

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The energy consumption structure in underdeveloped rural areas of China has long been dominated by fossil fuels. Such a structure not only makes it difficult to improve the rural living environment but also hinders the stable development of the rural economy. For these regions, improving the living environment is one of the key tasks of China’s rural revitalization strategy. As a clean energy with huge potential, renewable energy can provide a convenient and low-cost solution for the transformation of the energy structure and the improvement of the living environment in these areas. This study

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17

Ворочаева, Людмила, Lyudmila Vorochaeva, Сергей Савин, Sergey Savin, Андрей Яцун, and Andrey Yacun. "SYSTEM DEVELOPMENT FOR DEFINITION OF CONTACT INTERACTION MODE IN LINK OF SLIDING ROBOT WITH OBSTACLE." Bulletin of Bryansk state technical university 2019, no. 8 (2019): 11–21. http://dx.doi.org/10.30987/article_5d6cbe42247be1.64247013.

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The paper is dedicated to the problems of a link motion in a sliding robot on a horizontal surface with obstacles. The motion of a robot link is under consideration in case when one of its bearings located in utmost points is fixed on the surface and the second slips, that is, a link moves on an arc of a circle, at that a robot itself changes its configuration. A distinguishing peculiarity and advantage of this work is that in it there is no consideration of a specific design circuit of a sliding robot with the definite link number and type of swing joints between them, but a link turn on the

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18

Wang, Wenrui, Mingchao Zhu, Xiaoming Wang, Shuai He, Junpei He, and Zhenbang Xu. "An improved artificial potential field method of trajectory planning and obstacle avoidance for redundant manipulators." International Journal of Advanced Robotic Systems 15, no. 5 (2018): 172988141879956. http://dx.doi.org/10.1177/1729881418799562.

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In this article, we present an improved artificial potential field method of trajectory planning and obstacle avoidance for redundant manipulators. Specifically, we not only focused on the position for the manipulator end-effectors but also considered their posture in the course of trajectory planning and obstacle avoidance. We introduced boundaries for Cartesian space components to optimize the attractive field function. Moreover, the manipulator achieved a reasonable speed to move to the target pose, regardless of the difference between the initial pose and target pose. We proved the stabili

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19

Kress, Rainer, and Kuo-Ming Lee. "A second degree Newton method for an inverse obstacle scattering problem." Journal of Computational Physics 230, no. 20 (2011): 7661–69. http://dx.doi.org/10.1016/j.jcp.2011.06.020.

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20

Peidro, Adrian, and Edward J. Haug. "Obstacle Avoidance in Operational Configuration Space Kinematic Control of Redundant Serial Manipulators." Machines 12, no. 1 (2023): 10. http://dx.doi.org/10.3390/machines12010010.

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Kinematic control of redundant serial manipulators has been carried out for the past half century based primarily on a generalized inverse velocity formulation that is known to have mathematical deficiencies. A recently developed inverse kinematic configuration mapping is employed in an operational configuration space differentiable manifold formulation for redundant-manipulator kinematic control with obstacle avoidance. This formulation is shown to resolve deficiencies in the generalized inverse velocity formulation, especially for high-degree-of-redundancy manipulators. Tracking a specified

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21

Usama, Masood, Xianhua Li, Haohao Yu, and Yamin Iqra. "Obstacle Avoidance Trajectory Planning for Robotic Arm based on Genetic Algorithm." International Journal of Recent Technology and Engineering (IJRTE) 12, no. 4 (2023): 20–25. http://dx.doi.org/10.35940/ijrte.d7946.1112423.

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For the problem of obstacle avoidance trajectory planning of a robot arm, a robot arm obstacle avoidance method based on a genetic algorithm is proposed. It is based on the two problems that the motion process can avoid obstacles and the motion process is more stable and efficient. First, the motion of each joint is planned as a sixth-degree polynomial, and the coefficients of the sixth-degree term are set as the pending parameters, and the motion of each joint is changed by changing the pending parameters. Then, the fitness function is then constructed by calculating the collision detection,

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22

Zhang, Xiangju, Zhixuan Huang, Yongsheng Li, and Ximei Li. "Is Tourism Coordinated with the Economy and the Environment in Natural World Heritage Cities in China?" Land 14, no. 3 (2025): 615. https://doi.org/10.3390/land14030615.

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For tourist cities, coordination between tourism and socio-economic and natural environments is crucial for sustainable urban development. While the positive correlation between a Natural World Heritage (NWH) designation and local urban tourism growth has been validated, the interplay among tourism, the economy, and the environment remains underexplored. We conceptualize NWH cities as complex adaptive systems and establish an evaluation framework to assess the relationships among tourism, economic, and environmental subsystems. Using 34 NWH cities in China as case studies, we apply a coupling

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23

AlOqlah, Reema Mahmoud Abod. "Application of E-Management and its Obstacles from Perspectives of Faculty Members at Imam Abdulrahman bin Faisal University." Journal of Educational and Social Research 11, no. 3 (2021): 252. http://dx.doi.org/10.36941/jesr-2021-0067.

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E-Management is very important in the current high-tech word, and it plays a vital role in the world’s progress in general and academic field in particular. This study aimed to determine the degree of application of electronic management at Imam Abdul Rahman bin Faisal University and to identify the obstacles facing its application. The overall sample participated in this study was 285. A quantitative research design was employed in this study in which an adapted questionnaire was administered to the participants of this study. The sample includes faculty members from Imam Abdulrahman bin Fais

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Reddy, Mr M. Sreenivasulu, G. Siva Shankar Reddy, B. Akhileswari, L. Navitha, and Krishnaveni Krishnaveni. "Arduino Radar Model with Auto Detection and Target Neutralization." INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 09, no. 04 (2025): 1–9. https://doi.org/10.55041/ijsrem43825.

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Arduino Radar Model With Auto Detection and Target Neutralization develops a real-time obstacle detection system using an Arduino, ultrasonic sensors, a servo motor, and a laser module. The system scans a 180-degree area like a radar, detecting obstacles and activating a laser when they are too close. Sensor data is sent to a Processing-based platform, which displays a live radar-like interface showing detected objects. The dual-sensor setup improves accuracy and coverage, making the system reliable for applications in security, robotics, and automation. By combining low-cost hardware with sma

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Sadegh, Nader. "Dual objective motion planning subject to state constraints." Robotica 35, no. 5 (2015): 1157–75. http://dx.doi.org/10.1017/s026357471500106x.

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SUMMARYThis paper presents a novel motion planning approach inspired by the Dynamic Programming (DP) applicable to multi degree of freedom robots (mobile or stationary) and autonomous vehicles. The proposed discrete–time algorithm enables a robot to reach its destination through an arbitrary obstacle field in the fewest number of time steps possible while minimizing a secondary objective function. Furthermore, the resulting optimal trajectory is guaranteed to be globally optimal while incorporating state constraints such as velocity, acceleration, and jerk limits. The optimal trajectories furn

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Yu, Huan, and Qi Yang. "Evaluation of the Development Level of Green Transportation in National Central Cities." Sustainability 16, no. 17 (2024): 7270. http://dx.doi.org/10.3390/su16177270.

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Green transportation is the core embodiment of ecological civilization and the concept of green development within the field of transportation, and it is an important strategic choice for sustainable urban development. National central cities represent the highest level in China’s urban system planning. This paper aims to evaluate the level of green transportation development in national central cities. It established a set of 29 specific evaluation indicators from five dimensions: basic indicators, green transportation infrastructure, traffic environmental protection, traffic travel, and traf

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Gao, Xin, Haoxin Wu, Lin Zhai, et al. "A rapidly exploring random tree optimization algorithm for space robotic manipulators guided by obstacle avoidance independent potential field." International Journal of Advanced Robotic Systems 15, no. 3 (2018): 172988141878224. http://dx.doi.org/10.1177/1729881418782240.

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The crucial problem of obstacle avoidance path planning is to realize both reducing the operational cost and improving its efficiency. A rapidly exploring random tree optimization algorithm for space robotic manipulators guided by obstacle avoidance independent potential field is proposed in this article. Firstly, some responding layer factors related to operational cost are used as optimization objective to improve the operational reliability. On this basis, a potential field whose gradient is calculated off-line is established to guide expansion of rapidly exploring random tree. The potentia

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28

Xue, Zhixuan, Xiangli Wu, Yilin Zhang, Siji Zhu, Ni Zhang, and Shuhang Zhao. "Multidimensional Spatiotemporal Correlation Effect of County-Scale Population Shrinkage: A Case Study of Northeast China." Sustainability 16, no. 11 (2024): 4498. http://dx.doi.org/10.3390/su16114498.

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There is a mutual causal relationship between population shrinkage and the level of regional social–economic–ecological development and their coordinated development. It is of great significance to reveal the correlation effect between population shrinkage and regional development for the adjustment and optimization of the relationship between regional population and social, economic and ecological development. Taking 142 counties in the three provinces of Northeast China as samples, the population contraction was identified and classified in different segments, and a comprehensive evaluation

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Rajavarshini, R., S. Shruthi, P. Mahanth, Boddu Chaitanya Kumar, and A. Suyampulingam. "Comparative analysis of image processing techniques for obstacle avoidance and path deduction." Journal of Physics: Conference Series 2070, no. 1 (2021): 012121. http://dx.doi.org/10.1088/1742-6596/2070/1/012121.

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Abstract The growing need for automation has a significant impact on our daily lives. Automating the essentials of our society like transportation system has plenty of applications like unmanned ground vehicles in military, wheel chair for disabled, domestic robots, etc., There are driving, braking, obstacle tackling etc., to a transportation system that can be automated. This paper particularly focuses on automating the obstacle avoidance which provides intelligence to the vehicle and ensures a high degree of safety and is performed using image processing algorithms. Edge based detection, ima

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Baratta, Alessandro. "Dynamics of a single-degree-of-freedom system with a unilateral obstacle." Structural Safety 8, no. 1-4 (1990): 181–94. http://dx.doi.org/10.1016/0167-4730(90)90039-r.

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Han, Dongling, Yu Zhao, Xiaoyang Duan, Miao Yu, and Tianping Bi. "IMPACT OF URBANIZATION ON CARBON BALANCE CAPACITY: COUPLING DEGREE AND OBSTACLE ANALYSIS." Environmental Engineering and Management Journal 24, no. 5 (2025): 927–39. https://doi.org/10.30638/eemj.2025.070.

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Zuo, Xiao, Jun Yu, Tong Xian, Yuzhe Hu, and Zhiyi Hu. "Road Obstacle Object Detection Based on Improved YOLO V4." International Journal of Advanced Network, Monitoring and Controls 6, no. 3 (2021): 18–25. http://dx.doi.org/10.21307/ijanmc-2021-023.

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Abstract In recent years, as one of the important technical tasks in the field of deep learning, object detection has broad prospects and applications in the field of road obstacle detection. However, in the real driving scene, there are many obstacles, serious occlusion, overlap and other problems, so that the existing obstacle detection algorithm can not effectively detect the obstacles on the road, so it can not guarantee the driving safety. In order to solve the above problems, this paper improves on the basis of Yolo V4 algorithm. Firstly, kmeans + + clustering is used to generate a prior

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Ding, Shujuan, and Zhenyu Fan. "Spatiotemporal Evolution and Obstacle Factor Analysis of Coupling Coordination Between Economic Resilience and Green, Low-Carbon Development in China." Sustainability 16, no. 24 (2024): 11006. https://doi.org/10.3390/su162411006.

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To achieve economic resilience and green, low-carbon development are two goals of China’s high-quality economic development. This paper uses the entropy weight method and coupling coordination degree model to estimate the coupling coordination level of economic resilience and green, low-carbon development. Kernel density estimation, Moran index, Dagum Gini coefficient, Markov chain, and obstacle degree model are used to explore the spatiotemporal evolution characteristics and obstacle factors. The results are as follows. (1) The coupling coordination degree between China’s economic resilience

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WEN, GUILIN, HUIDONG XU, LU XIAO, XIAOPING XIE, ZHONG CHEN, and XIN WU. "EXPERIMENTAL INVESTIGATION OF A TWO-DEGREE-OF-FREEDOM VIBRO-IMPACT SYSTEM." International Journal of Bifurcation and Chaos 22, no. 05 (2012): 1250110. http://dx.doi.org/10.1142/s0218127412501106.

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Vibro-impact systems with intermittent contacts are strongly nonlinear. The discontinuity of impact can give rise to rich nonlinear dynamic behaviors and bring forth challenges in the modeling and analysis of this type of nonsmooth systems. The dynamical behavior of a two-degree-of-freedom vibro-impact system is investigated experimentally in this paper. The experimental apparatus is composed of two spring-linked oscillators moving on a lead rail. One of the two oscillators connected to an excitation system intermittently impacts with a spherical obstacle fixed on the thick steel wall. With di

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Zhang, Kaisheng, Xuemin Sun, Ruiming Li, Zhiguo Yu, and Biao Yu. "A linkage-type self-adaptive deformable tracked mechanism based on the six-bar mechanism." Mechanical Sciences 15, no. 2 (2024): 541–53. http://dx.doi.org/10.5194/ms-15-541-2024.

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Abstract. In order to design a self-adaptive tracked mechanism that can passively adjust according to the height of different obstacles to improve its obstacle-crossing performance, this paper proposes a linkage-type self-adaptive deformable tracked mechanism. The mechanism based on the planar six-bar mechanism is proposed, and its motion modes and obstacle-crossing capabilities are analyzed. Firstly, based on the characteristics of self-adaptive deformation and the planar six-bar mechanism, a deformable single-degree-of-freedom (DOF) multi-loop mechanism is designed by limiting the DOF and ad

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Zhang, Bin, Weidong Feng, Xingdong Zhang, Shudong An, Amanuel Girma, and Wanqing Wu. "Experimental Study on the Effect of Air Pollution Caused by Methane-Air Deflagration Characteristics." Revista de Chimie 71, no. 4 (2020): 549–60. http://dx.doi.org/10.37358/rc.20.4.8096.

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In order to study the effect of combustible gas cloud releasing from FPSO upper deck facilities deflagration characteristics on air pollution, a semi-open open test pipe system was built. By changing the initial conditions such as the obstacles length, distance between obstacles, section shape of obstacles and pipe system structure, the flame propagation mechanism and overpressure changing rules of methane / air deflagration were analyzed. As a result of that, the degree of sufficiency of methane combustion was analyzed, which could be seen as air pollution level. With the increase of the leng

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Sankaranarayanan R, Manjushree R, Harshini P, and Jeeshitha G V. "Obstacle Detection For Visually Impaired." International Research Journal on Advanced Engineering and Management (IRJAEM) 2, no. 04 (2024): 1200–1203. http://dx.doi.org/10.47392/irjaem.2024.0160.

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The paper examines innovative obstacle-detection solutions designed for visually impaired people who do not rely on traditional sensors and recognize the challenges they face when navigating their environment independently. It delves into techniques leveraging alternative sensory modalities such as auditory and tactile feedback, prioritizing user experience and safety. Evaluation criteria encompass effectiveness, ease of use, and affordability, during discussions involve adapting existing infrastructure for tactile navigation and collaboration with guide animal organizations to devise comprehe

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Meng, Lin, Fengjuan Yan, Qi Fang, and Wentao Si. "Research on the Educational Tourism Development of Intangible Cultural Heritage: Suitability, Spatial Pattern, and Obstacle Factor." Sustainability 16, no. 11 (2024): 4647. http://dx.doi.org/10.3390/su16114647.

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Combining the Intangible Cultural Heritage and sustainable development has been an important effort of UNESCO since the new century. This study discusses the suitability of educational tourism development of intangible cultural heritage. On the one hand, it was beneficial to improve the comprehensive quality of students; on the other hand, it was conducive to protecting and rationally developing the cultural heritage and avoiding its loss. In this study, an evaluation index system was established according to the analytic hierarchy process, which included two aspects (i.e., intrinsic value and

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Pushkarev, Igor I. "A CONTROL SYSTEM FOR MOVEMENT AND DIVERGENCE OF UNMANNED SHIP ACCORDING TO COLREG." Vestnik Gosudarstvennogo universiteta morskogo i rechnogo flota imeni admirala S. O. Makarova 14, no. 6 (2022): 837–48. http://dx.doi.org/10.21821/2309-5180-2022-14-6-837-848.

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A variant of unmanned ship control system with obstacle avoidance in accordance with International Regulations for Preventing Collisions at Sea (COLREG) is proposed in the paper. The system consists of three subsystems: trajectory control subsystem, obstacle avoidance subsystem, course and speed control subsystem. The trajectory control subsystem generates a course that allows you to move along a predetermined trajectory. A gradient vector of the auxiliary function algorithm is used for this. In this algorithm, the alfa weight coefficient, which determines the degree of convergence of the unma

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Li, Xue, Sheng Liao, and Ke Gao. "The Analysis of the Coordination Degree of Higher Education in Yunnan Province." Education Journal 13, no. 5 (2024): 275–83. http://dx.doi.org/10.11648/j.edu.20241305.14.

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This paper researched the coordination degree of higher education in Yunnan Province. Firstly, the coefficients of weight index were derived from the available value of data reflecting the information entropy. The results show that the index with the highest weight of higher education is the ratio of teachers to students, and the lowest weight is the number of annual core articles. The weight value of each index is between 0.0793 and 0.3964; secondly, the index of higher education was cauculated in 2010-2021, and compared the index differences among different cities. The results show that the

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Kang, Yixin. "Coupling Coordination Analysis of Green Tourism - Regional Economy - Regional Logistics." Highlights in Business, Economics and Management 34 (June 10, 2024): 122–32. http://dx.doi.org/10.54097/hg78g950.

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By using the panel data of 30 provinces and cities in China from 2011 to 2021, the entropy weight method, coupled coordination model and obstacle degree model are used to construct the coupled coordination index system of green tourism, regional economy and regional logistics, and explore the spatio-temporal evolution, coupled coordination evolution characteristics and impact factors of different regions. The results showed that: (1) Green tourism and regional economic system showed an overall upward trend, while regional logistics system showed a trend of first increase and then decrease. (2)

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Zhang, Ying, and Yunyan Li. "A Study on the Coupling Coordination of Urban Resilience and the Tourism Economy in the Beijing–Tianjin–Hebei Region." Sustainability 16, no. 12 (2024): 4946. http://dx.doi.org/10.3390/su16124946.

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The high-quality economic growth of tourism is intimately related to a city’s overall strength, and urban resilience is an important index to measure the comprehensive strength of a city. Therefore, determining how to enhance the construction of urban resilience, improve the quality of tourism development, and promote the coupling coordination of these two systems has attracted academic attention in recent years. Based on the panel data of 13 cities in the Beijing–Tianjin–Hebei region from 2010 to 2021, an entropy weight method, coupling coordination model, and obstacle degree model were used

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Wang, Yidi, Xianzhao Liu, Mengru Song, and Chenxi Dou. "Evaluation of Food Security in Different Grain Functional Areas in China Based on the Entropy Weight Extended Matter Element Model." Foods 14, no. 7 (2025): 1111. https://doi.org/10.3390/foods14071111.

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An accurate assessment of food security and its challenges is essential for formulating effective measures and promoting sustainable socioeconomic development. This study develops an evaluation system for China’s food security, focusing on four dimensions: food supply, food access, food production stability, and food continuity. The entropy weight extended matter element model is used for quantitative processing, which ensures that the integrity of the information can be guaranteed to a greater extent while reducing the influence of subjective factors, and then, the study evaluates the food se

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Chen, Hao, Yingying Hua, and Yaying Xu. "Spatial-Temporal Evolution Patterns and Obstacle Factors of Urban–Rural “Economy–Society–Ecology” Coordination in the Yangtze River Delta." Sustainability 15, no. 18 (2023): 13839. http://dx.doi.org/10.3390/su151813839.

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Background: In the context of sustainable development, urban–rural integration is not solely focused on high economic growth but has been expanded to a wider range of social and ecological fields. Objectives: To analyze the spatial and temporal evolution of the coupling coordination level of urban–rural economic, social and ecological integration subsystems in the Yangtze River Delta and to explore its main obstacles, in order to provide countermeasures to promote the sustainable development of urban and rural areas. Methods: Panel data of 16 cities in the core area of the Yangtze River Delta

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Khaled, Nassim, and Rami Alkhatib. "Novel Formulation for Line of Sight Guidance and Obstacle Avoidance for Under-actuated Ships." WSEAS TRANSACTIONS ON CIRCUITS AND SYSTEMS 20 (March 16, 2021): 1–9. http://dx.doi.org/10.37394/23201.2021.20.1.

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Automatic control of under-actuated ships is a challenging task due to the external factors and limited actuators onboard a ship. It is even more so when the controller needs to seamlessly integrate with a guidance system and obstacle avoidance for the purpose of autonimity. In this paper, line of sight guidance system for marine surface vessels is augmented to include obstacle avoidance. The process of directing the ship movement to avoid a stationary and moving obstacles is tackled by introducing an iterative mathematical formulation for the circle of avoidance algorithm. Unlike learning bas

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Terziev, Angel, Yancho Panteleev, Iliya Iliev, and Hristo Beloev. "Evaluation of the influence of the windbreak trees on the change of wind shear in weakly complex terrains." E3S Web of Conferences 286 (2021): 02015. http://dx.doi.org/10.1051/e3sconf/202128602015.

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The turbulent nature of the wind above the earth’s surface depends on both the topology of the terrain and the presence of natural obstacles along the way such as low grasses and shrubs, as well as medium-tall trees. When the wind passes through the indicated obstacles, detachment is observed i.e. formation of large eddies, which are carried away by the main flow, after which they dissipate. The size of the vortices, as well as the period of dissipation, depends on the wind speed, as well as the type of obstacle. The presence of windbreak trees significantly changes the wind shear over the sur

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Jin, Min, and Xuezhong Jiang. "Research on Coupling Coordination Level Between New-Quality Productivity and Industrial Structure Upgrading in the Yangtze River Economic Belt Urban Area." Sustainability 17, no. 11 (2025): 5201. https://doi.org/10.3390/su17115201.

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New-quality productivity and industrial structure upgrading has become a primary area of concern with respect to regional economic transformation and sustainable development. Based on static panel data of 108 prefecture-level-and-above cities in the Yangtze River Economic Belt from 2013 to 2022, the projection pursuit model, coupling coordination degree model, and obstacle degree model were used to study the spatiotemporal patterns and key obstacle factors in the coupling of new-quality productivity and levels of industrial upgrading. Results show the following: (1) The average coupling coordi

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Zhang, Mingya, Yetao Zhou, and Senyao Sang. "Vulnerability analysis of the economic-social-ecological complex system of Island tourism destinations." PLOS One 20, no. 7 (2025): e0324714. https://doi.org/10.1371/journal.pone.0324714.

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Exploring the vulnerability characteristics of the economic-social-ecological complex system of island tourism destinations can provide better theoretical and practical guidance for the sustainable development of island tourism destinations. Taking Zhoushan, which is a famous island tourism destination in China, as a case, based on the vulnerability analysis framework of exposure, sensitivity, and adaptive capacity, this paper employs the entropy value method, comprehensive index method, system coordination degree model, and obstacle model to quantitatively measure the vulnerability of the eco

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Li, Fanke, and Zhongqingyang Zhang. "Addressing the Sustainability Challenges: Digital Economy Information Security Risk Assessment." Sustainability 17, no. 14 (2025): 6428. https://doi.org/10.3390/su17146428.

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In the digital economy, sustainable development is based on digital technologies. However, information security issues arising from its use pose significant challenges to sustainable development. Assessing information security risks in the digital economy is crucial for sustainable development. This paper constructs an information security risk assessment indicator system for the digital economy based on information ecology theory. Using game theory to combine CRITIC weights and entropy weights, the information security risk values for the digital economy in 29 provinces of China from 2019 to

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Wang, Wei, Aihua Li, Yiyang Li, Xiaoxiao Zhou, and Yafeng Yang. "Spatiotemporal Distribution and Obstacle Factors of New-Quality Productivity in Water Conservancy in China Based on RAGA-PP and Obstacle Degree Model." Sustainability 17, no. 10 (2025): 4534. https://doi.org/10.3390/su17104534.

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Developing new-quality productivity in water conservancy (NQPWC) is vital for advancing economic and social development, with a focus on sustainability. An evaluation of NQPWC and the identification of key barriers can help define the challenges and guide the development of targeted solutions. This study established an evaluation indicators system for NQPWC through four dimensions (3H1G): High-technology, High-efficiency, High-quality, and Green. Utilizing a multi-attribute decision approach based on the Real-Code Accelerated Genetic Algorithm Projection Pursuit model (RAGA-PP model), an evalu

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