Presence Of Obstacles Research Articles

Sustainable Development

An analysis of the Sustainable Development Goals (SDGs) in South Asian countries, including Bangladesh, Bhutan, India, Maldives, Nepal, Pakistan, and Sri Lanka, highlights the presence of socio-economic and political obstacles. This research examines the challenges that are impeding the accomplishment of Sustainable Development Goals (SDGs), such as poverty (SDG 1), health (SDG 3), education (SDG 4), and economic growth (SDG 8), utilizing data from the World Bank, IMF, WHO, and FAO. The financial facts given highlight the immediate need for significant actions. The report recommends that Developed Countries (DCs) take on a crucial role by allocating at least one per cent of their Gross National Product (GNP) towards development aid. Achieving success in implementing the Sustainable Development Goals (SDGs) requires effective governance and the execution of structural changes. The report advocates for providing development aid from developed countries to underdeveloped countries (UDCs), aiming to foster the exchange of experiences to address common difficulties. The conclusions guide South Asian governments in formulating efficacious economic strategies to achieve the Sustainable Development Goals by 2030. In addition, the study examines 26 papers issued by the Higher Education Commission (HEC) that investigate sustainability in Pakistani Higher Education Institutions. An analysis of this research reveals both advancements and obstacles in pursuing Education for Sustainable Development (ESD). Various stakeholders actively participate in the transformational process, including administrators, leaders, instructors, and students. The examination focuses on governance, communication, coordination, and campus outreach and tackles problems. Aligning with the Sustainable Development Goals (SDGs), prioritizing logistical assistance and excellent education (SDG 4) is crucial. The study is a manual for educators, policymakers, and curriculum creators to promote Sustainable Development, assisting researchers in formulating inquiries for sustainable development objectives.

Decentralized Protocol for Organizing Sustainable Interaction between Subscribers in Networks with High Dynamics of Topology Changes

Emergency services often have to carry out rescue and liquidation operations in the absence of centralized communications. The inability to ensure stable communication between members of the rescue unit significantly reduces the quality of work. Moreover, in modern realities, stable communication means not only voice exchange, which can be provided by shortwave radio transmitters, but also intensive exchange of large volumes of traffic. The use of standard solutions based on standard network equipment (Wi-Fi, satellite communications, etc.) and existing algorithms for ensuring quality of service in the conditions under consideration does not allow quickly ensuring information exchange between heterogeneous subscribers. Moreover, operation in high-Hz bands can be very difficult in the presence of obstacles, which reduces the overall coverage area and the quality of data transmission. We propose a network layer routing protocol designed to organize decentralized communication in an emergency service department, where subscribers have different degrees of mobility and types of transmitted traffic. This protocol includes algorithms for connecting to the network, detecting optimal and alternative communication routes, and transmitting and balancing traffic along the found routes. The original route search algorithm analyzes the performance of communication channels and determines all possible paths for transmitting traffic between subscribers. Using the route evaluation function based on gradient boosting of decision trees, optimal and alternative communication routes are formed, and when transmitting data, traffic balancing is performed based on the received information. An experimental study of the proposed protocol showed an improvement in the speed of deployment and quality of service in scenarios with varying degrees of subscriber mobility.

Probabilistic Higher-Order Velocity Obstacle for Dynamic Collision Avoidance in Uncertain Environments

Autonomous systems like unmanned aircraft systems are touted as front-runners in terms of efficiency and agility in challenging operations like emergency response. The ability of autonomous agents in such systems to avoid collisions with dynamic obstacles while navigating through an obstacle-cluttered environment is critical for success in any mission. In addition to that, further challenges are posed by environments with uncertainties in obstacles’ motion, sensing, and occluded regions. To this end, a higher-order velocity obstacle–based novel motion planner is presented in this paper in a probabilistic setup for smooth, collision-free navigation of the agent with acceleration constraints in uncertain, unstructured environments with an element of anticipation for the future environment. The effectiveness of the developed algorithm for safe, collision-free, and smooth navigation of the agent is investigated in simulation studies in two different kinds of environments, one with known trajectories of obstacles and the other with unknown maneuvering trajectories of obstacles. Extensive simulation studies are performed in the presence of dynamic obstacles to elucidate the performance of the proposed algorithm on four crucial parameters—mission time, computational time, minimum obstacle distance, and an overall control effort under varied obstacle densities. With satisfactory performance in all these aspects, the developed algorithm possesses strong potential for real-time implementation.

VLC channel model in underground mining scenarios with the extinction effect and shadowing effect

In this work, a novel, to our knowledge, visible light communication (VLC) channel model is proposed for underground mining scenarios taking into account the impact of coal dust particles and obstacles. Specifically, the extinction effect of the coal dust particles is analyzed on the basis of the Mie theory, and the quantitative formula of the influence on channel direct current (DC) gain is derived. Meanwhile, the effect of a random shadowing phenomenon is investigated and quantified with the geometric and statistical model considering the position, size, and shape of the obstacles. The channel impulse response, path loss, root mean square delay spread, and bit error rate (BER) are further investigated in two different underground mining scenarios, namely, a mining roadway and coal mine working face. Simulation results show that the shadowing effect plays a major role in the influence of DC gain attenuation. Furthermore, the BER performance is noticeably degraded due to the presence of coal dust particles and obstacles, especially when the receiver is located far from the transmitter. This work will benefit the design of the VLC systems in underground mines.

Detection of dislocation motion in atomistic simulations of nanocrystalline materials

A method for identifying dislocation motion in atomistic simulations is presented. While identifying static and moving dislocations within a single crystal or a combination of such is well established, the method described here is tailored to identify dislocation motion by correlating the displacements of individual atoms. This facilitates the identification of dislocation motion in complex structural arrangements, and allows the specific contribution to plastic deformation, due to dislocation motion, to be separated from that of other mechanisms. The method is applied to test cases in crystals and grain boundaries (GBs), in which irradiation-induced creep (IIC) was induced. It is shown that the method singles out the moving dislocations from among the dislocation forest at GBs, thus identifying the specific reactions driving the distortion at any given time. This enables the study of dislocation processes in the presence of realistic obstacles, and the study of the effects of microstructure on dislocation mobility. As an example of such a study, the method is applied to rule out intragranular slip, and to estimate the contribution of dislocation motion to strain, in a NC undergoing IIC.

A Target Tracking Guidance for Unmanned Surface Vehicles in the Presence of Obstacles

A Target Tracking Guidance for Unmanned Surface Vehicles in the Presence of Obstacles

Issues of the functioning of soviet industrial cooperation in the restoration of the Bryansk region (1943–1945)

This study is devoted to industrial cooperation in the Bryansk region in the context of the restoration of this region after the Nazi occupation. Based on archival materials presented by the records of cooperative industry officials of the Bryansk region directly and their capital authorities, as well as reporting data from industrial cooperation and the State Planning Committee of the RSFSR from the funds of two federal and one regional archives, an attempt is being made to restore the history of industrial cooperation in the Bryansk region, highlighting features of the functioning of this system in the economy of the USSR using the example of a specific liberated subject of the Russian Federation. The article is based on a descriptive method using technology geographic information systems in the QGIS program. The author states the presence of serious obstacles in the work of Soviet industrial cooperation associated with the low material and technical equipment of industrial cooperative artels, as well as the complexity of the planned tasks assigned to them, but at the same time concludes that there is a certain limit of trust on the part of the state in terms of attitude towards the cooperative industry, which was expressed in the release of industrial cooperation with more serious plans compared to the main competitors of industrial cooperation in the form of local industry. Despite the low labor productivity, cooperators demonstrated high survival rate due to the combination of the active use of state resources, which provided all possible assistance to artels and the trade unions that form them, and the use of their own potential, expressed in the form of the possibility of simplified organization of production and investment long-term lending of intra-cooperative origin.

Terapia farmacológica de primera línea en cesación tabáquica

The current standard for smoking cessation is combined psychological and pharmacological treatment. Administering a drug to stop smoking in isolation (8-10% abstinence per year) is not the same as using it together with support and behavioral intervention (more than 30% abstinence). The fundamental reason drugs are used in the process of quitting smoking is because it has been proven that their use not only mitigates withdrawal symptoms but also increases long term quit rates (6-12 months). Varenicline, nicotine replacement therapy (NRT), bupropion and cytisine are all more effective than placebo. In very dependent smokers, a combination of drugs is recommended, with those associations containing varenicline being more effective. In special populations (chronic respiratory diseases, cardiovascular diseases or psychiatric pathology), varenicline alone or combined with NRT is recommended as the first option. Finally, it is important to highlight that the fact that a previous unsuccessful attempt to stop smoking with a certain drug is not a contraindication for its subsequent use since success depends on many factors, such as; correct usage of the drug, motivational stage, presence of environmental obstacles and a firm decision to quit smoking, among others.

Swarm Guidance Based on Mean Field Game Concepts

The concept of swarm comes from the biological world. Drones gather in groups of 100 or even 1000 to fly like a flock of birds, called swarms. Swarm systems satisfy several assumptions such as decentralized controls, local information and simple platforms. Swarm systems have attractive properties such as resilience, scalability, and ease of development and implementation. Swarm techniques can perform simple tasks such as moving in a coordinated direction. The flocking behavior of a group of animals that converge by local interactions toward the same heading is an example of simple consensus for decentralized dynamic systems. However, the notion of decentralized control based on local information suffers from taking into account the overall behavior of the group. For example, in a complex environment, a swarm will adapt to the presence of obstacles and congestion reactively, whereas we would like more anticipatory control. The objective of this paper is to propose a solution based on Mean Field Game (MFG) concepts to integrate macro-level knowledge at the micro-level in decentralized flocking.

Analysis of the Effect of Side Obstacles on Performance on the Z.A. Pagaralam Road Section

Development in Bandar Lampung is increasing rapidly, causing an increase in transportation development. The development of transportation in the city of Bandar Lampung is currently still experiencing severe problems, so traffic hours often occur. The high level of congestion on the highway is caused by several things, including the unbalanced road capacity and vehicle volume and the presence of side obstacles, which add to congestion on the Z.A. Pagaralam road section. Apart from being a public road, Pagaralam is also located in one of the busiest economic centers in the city of Bandar Lampung. Along this stretch of road are campuses, schools, shops, pharmacies, shopping centers, and street vendors, and it is also a transfer point for passengers moving from one public transport to another, causing many side obstacles to occur on the road. To overcome this, it is necessary to analyze the influence of side obstacles on traffic performance. Data analysis was carried out using the PKJI 2014 method. The analysis of traffic volume obtained a value of 4747.75 cur/hour. The analysis results of the highest side obstacles were obtained on Tuesday at 12.00 – 14.00 segment 1 amounting to 838.90 incident weights. Keywords: Traffic Volume, Side Obstacles, PKJI 2014.

Characterizing natural convection and thermal behavior in a square cavity with curvilinear corners and central circular obstacles

Thermal analysis through natural convection and heated obstacles in a different shape of cavity become an emerging concept among the scientific community. In this framework, this study investigates the natural convection phenomena occurring within a square cavity featuring a non-standard curvilinear shape and internally placed circular obstacles. The analysis focuses on the heat and fluid flow behavior in this unique geometrical configuration, exploring the influence of curvilinear boundaries and obstacles on convective heat transfer. The flow is assumed steady, laminar, and incompressible whereas a magnetic field with strength B0 is applied perpendicular to the fluid flow. No slip conditions are applied on each surface. The curvilinear corners and the inner circular obstacle are kept hot and the others including the bottom, left, right, and top walls are considered at cold temperatures. Numerical simulations are conducted to elucidate the complex interactions between the thermal gradients and fluid motion induced by the presence of circular obstacles. Galerkin finite element method is applied. The code validation and comparison with the existing data are being made. It is demonstrated that the local Nusselt number depends upon Rayleigh numbers, obstruction size, and Hartmann numbers. As the obstacles radius increases from 0.1 to 0.3, the temperature distribution in the middle of the cavity increases by almost 400%. This aids engineering in the manipulation of the heat transfer equipment used in this investigation. Around four corners, the local minimum Nusselt number rises by almost 97% as the radius increases from 0.1 to 0.3. These findings offer insightful knowledge about the fluid's dynamic behavior and a nice understanding of the roles played by geometric features, buoyancy-driven convection, and magnetic effects in the overall dynamics of heat transfer in industrial thermal processes. This knowledge aids scientists in designing suitable heat exchangers based on actual conditions.

Insights on structure-obstacle-soil interactions during the installation of monopiles for OWTs

ABSTRACT In this paper, a new three-dimensional FE model considering the structure-object-soil interaction is proposed to simulate the contact process during monopile installation. Using this model, the displacement vector diagrams and plastic strain contours of the obstacle and surrounding soil are obtained and analysed in detail to explain the soil failure mechanism and its effect on the installation resistance and moment profiles. Furthermore, the influences of the obstacle shape, size and contact position on the installation resistance of the monopile foundation are investigated. Results show that for obstacles with a dimensionless size (defined as the obstacle size to the monopile diameter) of 0.33, the resultant moment values exceed 1500kN·m, and the vertical resistance in the presence of obstacles is 0.88-1.53 times larger than that in the absence of obstacles. Further evaluation should be conducted to evaluate the effects of the resultant moments and vertical resistance on the actual installation process.

Effective driver distraction warning system incorporating fast image recognition methods

Modern cars are equipped with advanced automatic technology featuring various safety measures for car occupants. However, the growing density of vehicles, especially in areas where infrastructure development lags, poses potential dangers, particularly accidents caused by driver subjectivity. These incidents may occur due to driver distraction or the presence of high-risk obstacles on the road. This article presents a comprehensive solution to assist drivers in mitigating these risks. Firstly, the study introduces a novel method to enhance the recognition of a driver's facial features by analyzing benchmarks and the whites of the eyes to assess the distraction level. Secondly, a domain division method is proposed to identify obstacles and lanes in front of the vehicle, enabling the assessment of the danger level. This information is promptly relayed to the driver and relevant individuals, such as the driver's manager or supervisor. An experimental device has also been developed to evaluate the effectiveness of the algorithms, solutions, and processing capabilities of the system.

Hydrodynamic of surge radiation by a floating cylinder in the presence of bottom-mounted cylindrical obstacle in a two-layer fluid system

Hydrodynamic of surge radiation by a floating cylinder in the presence of bottom-mounted cylindrical obstacle in a two-layer fluid system

A parallel programming application of the A* algorithm in digital rock physics

Pore-scale analysis and characterization of reservoir rocks provide valuable information for the definition and management of underground hydrogen storage and CO2 storage or sequestration.This article presents an optimized implementation of the A* algorithm, the most popular pathfinding method in the presence of obstacles. In this context, the algorithm is applied to recognize the minimum length connected paths through each flow direction of 3D images of a porous medium representative of a reservoir rock. The identification of the main paths allows the characterization of the pore space and the calculation of fundamental petrophysical properties such as tortuosity and effective porosity, which can be used for permeability estimation. Compared to other algorithms available for pore-scale characterization, such as the pore centroid, A* provides a better approximation of the pore space available for the flow and, therefore, a reliable characterization of the petrophysical properties. On the other hand, path identification is significantly consuming in terms of time and memory. In this paper, an efficient and optimized implementation based on C++/OpenMP programming language is presented.The proposed implementation aims to the analysis of large-scale models profiting from parallelization, memory optimization, and enhanced managing of dead paths. Three test cases of increasing sizes are presented, to analyze the advantages and the disadvantages of the algorithm as the number of explored points increases. The 3D binary images analyzed are related to a synthetic domain (1 million voxels) and two actual sandstone samples (about 4 and 64 million voxels respectively). The code is validated against a Matlab serial implementation, showing a significant improvement in efficiency. Remarkable test cases of several millions of voxels were afforded, overcoming the memory and execution slowness issues. Moreover, the proposed implementation is suitable for large pore-scale models run in HPC environments.

Compensation for moral harm in violation of the right to disrespect for kinship and family ties

The admissibility of a wider application of compensation for moral harm in violation of family rights in the science of family law is assessed ambiguously. The law provides for such an opportunity only in art. 30 of the Family Code for a conscientious spouse when the marriage is declared invalid.It is necessary to take into account the specifics of family relations, as deeply personal, and the fact that art. 8 of the Family Code does not limit the protection of family rights in the ways specified in the legal norms, allowing the use of other methods. At the same time, in accordance with the provisions of art. 4 of the Family Code, the application of civil legislation to family relations is allowed, if it does not contradict the essence of family relations, which leads to refusals in a claim for compensation for moral harm due to the presence of obstacles to relatives from one of the parents in communicating with the child, due to the fact that the provisions of the current civil and family legislation do not provide for the possibility of his penalties.One of the most important reasons for the negative attitude of the courts to the fundamental permissibility of a wider application of the above-mentioned measure of responsibility in violation of family rights is seen in the absence of developed conditions for an offense that would be the basis for the application of compensation for moral harm, given that such conditions, taking into account the specifics of family relations, differ significantly from the usual conditions of civil liability.Goal. Identification of the criteria of private and family life applied by the European Court of Human Rights, as well as the study of the fundamental possibility of filing a claim for compensation for moral harm caused by the refusal of a parent to provide an opportunity to communicate with a child and participate in his upbringing to a separate parent.Methodology. In the course of the research, methods of generalization, description, analysis, synthesis, formal legal method were used.Results. The necessity of expanding the subject of proof in such a dispute with the inclusion of the following circumstances is justified. The presence of objective obstacles to communication, which can be associated with both the child (illness, unwillingness of the child to communicate with the parent), and with the personality of the parent living separately, communication with which can negatively affect the child. It is necessary to take into account the opinion and interests of the child. It is also necessary to take into account the actions of the parent himself, demanding compensation for moral harm, so if he evades the duties of maintaining his child, we assume the possibility of refusing the claim. Making a decision on compensation for moral harm involves taking into account the fault of the causer and his motives, which should not correspond to the interests of the child.

Modeling, Simulation and Control of a Spacecraft: Automated Rendezvous under Positional Constraints

The aim of this research paper is to propose a framework to model, simulate and control the motion of a small spacecraft in the proximity of a space station. In particular, rendezvous in the presence of physical obstacles is tackled by a virtual potential theory within a modern manifold calculus setting and simulated numerically. The roto-translational motion of a spacecraft as well as the control fields are entirely formulated through a coordinate-free Lie group-type formalism. Likewise, the proposed control strategies are expressed in a coordinate-free setting through structured control fields. Several numerical simulations guide the reader through an evaluation of the most convenient control strategy among those devised in the present work.

A comparative analysis of path planning algorithms for unmanned aerial vehicles

In terms of trajectory planning, the main objective is to reach a certain location in the shortest time possible, avoiding obstacles along the way. This paper proposes two path planning methods, in an environment with presence of obstacles, Probabilistic RoadMap and a fusion between Voronoi diagram and Dijkstra's Algorithm. Path planning for both algorithms is developed in the XY coordinate plane, therefore only horizontal movement is considered. This means that the UAV must fly around obstacles and cannot fly over or under them. The use of two-dimensional space in favour of three-dimensional space reduces the implementation time of the algorithm for solving the problem. Finally, an analysis of the length and the computational time of the trajectories generated by the proposed algorithms is made.

Coordination of gaze and action during high-speed steering and obstacle avoidance.

When humans navigate through complex environments, they coordinate gaze and steering to sample the visual information needed to guide movement. Gaze and steering behavior have been extensively studied in the context of automobile driving along a winding road, leading to accounts of movement along well-defined paths over flat, obstacle-free surfaces. However, humans are also capable of visually guiding self-motion in environments that are cluttered with obstacles and lack an explicit path. An extreme example of such behavior occurs during first-person view drone racing, in which pilots maneuver at high speeds through a dense forest. In this study, we explored the gaze and steering behavior of skilled drone pilots. Subjects guided a simulated quadcopter along a racecourse embedded within a custom-designed forest-like virtual environment. The environment was viewed through a head-mounted display equipped with an eye tracker to record gaze behavior. In two experiments, subjects performed the task in multiple conditions that varied in terms of the presence of obstacles (trees), waypoints (hoops to fly through), and a path to follow. Subjects often looked in the general direction of things that they wanted to steer toward, but gaze fell on nearby objects and surfaces more often than on the actual path or hoops. Nevertheless, subjects were able to perform the task successfully, steering at high speeds while remaining on the path, passing through hoops, and avoiding collisions. In conditions that contained hoops, subjects adapted how they approached the most immediate hoop in anticipation of the position of the subsequent hoop. Taken together, these findings challenge existing models of steering that assume that steering is tightly coupled to where actors look. We consider the study's broader implications as well as limitations, including the focus on a small sample of highly skilled subjects and inherent noise in measurement of gaze direction.

PERFORMANCE ANALYSIS OF PEDESTRIAN PATHS IN THE COLONIAL HISTORICAL AREA OF KOTA LAMA CIREBON

Pedestrian path conditions are one of the factors that affect willingness to walk and play an important role in supporting historical tourism activities. This study analyzes the performance of pedestrian paths expressed by Pedestrian Level of Service (PLOS) in the colonial historical area of Kota Lama Cirebon. The method used in this study was to conduct a geometric survey of pedestrian paths, pedestrian flow surveys, and pedestrian travel time surveys in 10 segments scattered throughout the study area. The survey results were analyzed regarding the 1985 Highway Capacity Manual (HCM) and PLOS values generated based on available walking space. The study shows that in terms of walking space availability, most of the segments in the study area have a PLOS A score, which means they are performing well. In comparison, some segments have poor PLOS, such as Merdeka Street, Yos Sudarso Street, TJ Street, and Kebumen Street, due to the unavailability of sufficient walking paths to serve pedestrians or the presence of side obstacles that reduce the effective width of the pedestrian path. To overcome these problems, several things need to be done, such as: 1) issue a policy prohibiting selling on pedestrian paths to reduce side obstacles so that the effective width of the pedestrian path can increase; 2) widen the pedestrian path at least according to the applicable standards; and 3) provide pedestrian paths on segments that do not yet have pedestrian paths.