Theoretical Model Of System Research Articles

Rural innovation system: Revitalize the countryside for a sustainable development

A world with large disparities in development between rural and urban areas could never achieve sustainable development goals (SDGs). Issues related to agriculture, rural areas, and farmers are fundamental to the stability and people's welfare of China as well as other developing countries. Despite the growing demand and national initiative for rural revitalization, rural innovation has received little attention in the innovation literature. Drawing from the new growth theory, institutional theory and innovation system theory, this paper proposes the rural innovation system, which is a complex socioeconomic network that aims to revitalize the countryside and achieve balanced and sustainable development. This paper compares the rural and urban innovation system, introduces a theoretical structural model of the rural innovation system, including a) technology innovation, b) institutional and management innovation, and c) community-based network and intermediary platform innovation. Then it outlines the future challenges in fostering a strong rural innovation system. The rural innovation system proposed makes direct contributions to the literature of rural studies, innovation system, and public policy, and offers both China and the world a new perspective for realizing rural revitalization, anti-poverty and global sustainable development.

Early Diagnosis of Coronary Artery Disease using UCI Data set

The focus of this project is based on both processing potential clinical features and implementing the classification architecture for detection of cardiac abnormality. The milestone of this first year involves analysis and investigation of different feature selection and transformation methods and theoretical modeling of single and hybrid systems by optimizing associated systematic parameters for better precision and recall. The importance of this paper is due to its clear objectives where an optimized and advanced system is designed and implemented for the cardiac disease utilizing computer aided diagnosis techniques for data and signal processing. The methodology is clear and trait forward using the hybrid approach of data mining techniques integrated to deliver enhanced performance on desired data set. In this paper comparative classification approaches are integrated to enhance system detection rate and decrease false alarms. The study focuses on feature preprocessing to select suitable feature subsets for classification algorithms like clustering (unsupervised learning) and SVM (supervised learning) which helps in generalizing the diagnosis system to detect unseen abnormality. For this study, will first apply statistical measures such as scoring ranking for clinical datasets consisting the electrocardiogram (ECG) features to reduce its dimension by eliminating irrelevant features. In the second part, will apply parametric tuned classification algorithms for selected feature subsets. The third part is to quantify the severity of CAD. At the last performance of the proposed system will be compared with other applied classification techniques in terms of accuracy, sensitivity and specificity.

Defect Detection of Oil and Gas Pipeline using Remote Field Eddy Current Technology

To solve the problem of wall thickness reduction and defects of oil and gas pipeline caused by corrosion or erosion, a remote field eddy current (RFEC) testing method with coaxial double coil structure is proposed to detect corrosion residual wall thickness of oil and gas gathering pipelines. Based on electromagnetic field theories, RFEC technology is theoretically analyzed. The theoretical model of RFEC detection for coaxial double coil structure is established. The relationship between the voltage phase of detection signal and the wall thickness of pipeline is derived, and an evaluation method of the residual wall thickness of the pipeline based on the phase trough time of the RFEC detection signal is proposed. The parameters of RFEC probe are optimized by Finite Element Method, and the detection system is designed on the basis of it. The practicability and the correctness of the theoretical model of the detection system are verified by experiments. It can be used to detect the residual wall thickness of pipelines in real time under different media conditions.

Analysis of stick-slip reduction for a new torsional vibration tool based on PID control

The phenomenon of stick-slip vibration is widespread in the exploration of deep and ultra-deep wells. It causes the reduction of the mechanical drilling rate and wastes the driving energy. Besides, it also accelerates the aging and failure of the drill strings and threatens the safety of drilling seriously. In order to effectively control the stick-slip vibration of the drill string, a new type of torsional vibration tool is proposed in this paper firstly. Then, the theoretical model of the drill string system based on the tool is established. And then, the viscosity reduction characteristics of the new torsional vibration tool are studied by the PID control method. Finally, field tests were carried out in comparison with simulation. The results show that the new torsional vibration tool can reduce the stick-slip vibration. And the two PID control equations can both control the drill bit speed in real time through changing the turntable speed. The results also have important reference significance for reducing and controlling the stick-slip vibration of the drill string and improving the rock-breaking efficiency.

Study of numerical simulation and dynamic performance optimization in evacuated tube SS-HTS maglev loop system

The maximum running speed of evacuated tube side-suspended high-Tc superconductor (SS-HTS) maglev loop system is only 160 km/h due to the limitation of running loop radius. In order to optimize and improve the high-speed dynamic performance of prototype vehicle in evacuated tube SS-HTS maglev loop system, the accelerated rotation dynamic process of prototype vehicle is equivalent to the quasi-static process of high-Tc superconductor (HTS) maglev system. The theoretical model of equivalent system is established based on superconducting and classical electromagnetic theory. The levitation and guiding performance of evacuated tube SS-HTS maglev loop system with different thicknesses single-seed YBaCuO bulks is simulated and tested by finite element software COMSOL Multiphysics (COMSOL) and equivalent experiment respectively. The simulation and experiment results show that the maximum running speed of prototype vehicle is expected to be increased by 15.1% from 160 km/h to 186.5 km/h when the HTS bulk thickness is reduced by 55% from 20 mm to 9 mm. The above research results provide the design reference for building the higher-performance and higher-speed evacuated tube SS-HTS maglev loop system.

Modeling and topology design for free-space optical networks

To date, free-space optical (FSO) networks play an important role in current network construction to support large-capacity transmission, where randomly distributed FSO terminals desire to exchange a tremendous amount of information over atmospheric turbulence channels. However, in the presence of atmospheric turbulence and misalignment fading channels, FSO network topology can be dynamic and disconnected. To mitigate the impact of dynamic network environments, appropriate higher-layer protocols should be designed. We explore a practical terrestrial mobile ad-hoc FSO network based on the bundle protocol of disruption-tolerant network, and the theoretical cross-layer system model between physical layer and network layer is derived. To design the topology, at the bundle layer, the distributed routing scheme centrality and probability (CAP) is proposed, where contact probability, sociocentric measure, and message replication strategy are considered simultaneously, and the joint forwarding decision rule is given. Simulation results on the opportunistic networking environment simulator are presented, which show that CAP can be better compared with the conventional end-to-end protocol-based routing scheme.

Corporate water management systems and incentives to self-discipline

Purpose Water management is an emerging practice. This paper aims to propose a theoretical model of a corporate water management system (WMS) and empirically explores whether superior water management improves water use performance. Design/methodology/approach Our model of WMS consists of 10 structural elements. We draw on self-discipline theory to predict the results and use archival data from the Carbon Disclosure Project to measure and evaluate the overall quality and effectiveness of the water management of our sample companies. Findings Companies motivated to adopt self-discipline tend to proactively implement high-quality WMSs. However, further analyses suggest that water management without regulatory sanctions appears insufficient for reducing water usage, at least in the short term. Overall, this study reveals a clear and growing tendency for businesses to manage water risks and a corresponding momentum toward more rigid control of water consumption. Research limitations/implications Corporate participation in the Carbon Disclosure Project survey is voluntary. Thus, the data in this paper are subject to self-selection bias, and what the companies claim concerning their behavior may not reflect the reality of their business practices. In addition, the inferences drawn here are based on data from only large firms. Future researchers could investigate whether and how corporate WMS continued to develop or decline in recent years, and how such practices integrate with other aspects of management (including carbon and energy). Practical implications This paper responds to water scarcity by exploring how the development of corporate WMS is driven by self-discipline motivation. This study sets out an agenda for the future of water accounting and management which can be used to guide research and stimulate extension in practice. Governments and non-governmental organizations may utilize the results to guide and bind corporations to achieve sustainability. Social implications The efficient use of freshwater is essential for sustainability, but limited studies have addressed the issue. The current paper explores this important issue, and our findings suggest regulatory institution is necessary to effectively enhance water usage. Originality/value This paper represents an early attempt to model corporate water management practices. A WMS should facilitate resilience in water management, measurement of water performance, and comparability among firms. This study contributes to the conceptualization and empirical assessment of self-discipline in motivated water management and enhances the validity and applicability of the theory of self-disciplining in sustainability research.

INNOVATIVE SCIENTIFIC-EDUCATIONAL CLUSTER AS A MECHANISM ACCELERATED INNOVATION PROCESS IN ICT

The article investigates the issues and challenges related to the variability, mobility of technologies of education, development of the conceptual framework based on modernization of IT education, formation of professional knowledge of future specialists of an IT profile in the system of continuous IT education in the conditions of the educational and scientific complex “school-college-university” and the ability IT expedient of such system of knowledge. The IT efficiency of the system of professional knowledge could be achieved through a scientific justification of the project-creative component that is not investigated enough. And there is necessity to implement this experimental innovative component of the professional IT training.In the process of the research the author worked out a theoretical cluster system model of economy by applying innovative technologies where intersubjective innovative connections are available. The research results involve clarification of the following concepts essence “modernization of the system of professional knowledge in IT” and “future specialists in the sphere of ITs”; introduction of a project- creative approach in an educational-scientific complex “an IT - school with its specialization – an IT - college – an IT-university” under conditions of the IT education.

Information Theoretic Security for Shannon Cipher System under Side-Channel Attacks †.

In this paper, we propose a new theoretical security model for Shannon cipher systems under side-channel attacks, where the adversary is not only allowed to collect ciphertexts by eavesdropping the public communication channel but is also allowed to collect the physical information leaked by the devices where the cipher system is implemented on, such as running time, power consumption, electromagnetic radiation, etc. Our model is very robust as it does not depend on the kind of physical information leaked by the devices. We also prove that in the case of one-time pad encryption, we can strengthen the secrecy/security of the cipher system by using an appropriate affine encoder. More precisely, we prove that for any distribution of the secret keys and any measurement device used for collecting the physical information, we can derive an achievable rate region for reliability and security such that if we compress the ciphertext using an affine encoder with a rate within the achievable rate region, then: (1) anyone with a secret key will be able to decrypt and decode the ciphertext correctly, but (2) any adversary who obtains the ciphertext and also the side physical information will not be able to obtain any information about the hidden source as long as the leaked physical information is encoded with a rate within the rate region. We derive our result by adapting the framework of the one helper source coding problem posed and investigated by Ahlswede and Körner (1975) and Wyner (1975). For reliability and security, we obtain our result by combining the result of Csizár (1982) on universal coding for a single source using linear codes and the exponential strong converse theorem of Oohama (2015) for the one helper source coding problem.

Corporate Social Responsibility Practices in the U.S.: Using Reverse Supply Chain Network Design and Optimization Considering Carbon Cost

A research model using the market price for greenhouse gas (GHG) emissions illustrates how the policies, and economic and environment implications of the carbon price can be formulated using a deterministic equilibrium model. However, with increasing carbon costs, the optimal reverse supply chain (RSC) system is being required to adapt and has undergone many distinct shifts in character as it seeks out new configurations through which costs may be effectively managed and minimized. The model was studied comprehensively in terms of quantitative performance using orthogonal arrays. The results were compared to top-down estimates produced through economic input-output life cycle assessment (EIO-LCA) models, providing a basis to contrast remanufacturing GHG emission quantities with those realized through original equipment manufacturing operations. Introducing a carbon cost of $40/t CO2e increased modeled remanufacturing costs by 2.7%, but also increased original equipment costs by 2.3%. The research presented in this study puts forward the theoretical modeling of optimal RSC systems and provides an empirical case study concerning remanufactured appliances, an area of current industrial literature in which there is a dearth of study.

Analysis of the Peak Load Leveling Mode of a Hybrid Power System with Flywheel Energy Storage in Oil Drilling Rig

The load frequently oscillates in large amplitude like pulses when the draw-works lift or lower in the oil well drilling rig, and that makes the diesel engine run uneconomically. A new solution for the pulse load problem is to add a motor/generator set and a flywheel energy storage (FES) unit to the diesel engine mechanical drive system to form a hybrid power system with energy storage. The storage capacity of the power and energy, and the charging-discharging operation modes are discussed for the first time. The engine power output in frequent fluctuation was measured in the oil well drilling engineering practice. The configuration and the theoretical model of the hybrid power system with energy storage and peak load leveling were established. Furthermore, 1% to 12% saving of fuel is possible for the case of single engine in the load leveling running mode compared to bi-engines in a traditional running mode for the peak load between 900 to 1200 kW and the valley load between 200 to 600 kW. The experimental verification of the load leveling with FES confirmed that the diesel engine worked more smoothly with less smoke emission. In addition, 5% to 10% more fuel was consumed in the load leveling test compared to the traditional running mode with the drive-by 800 kW diesel engine. However, 21% fuel saving was obtained in the load leveling test with the drive-by 400 kW diesel generator.

Comparing Gausian and exact models of malicious interference in VLC systems

Visible Light Communication (VLC) is a technique for high-speed, low-cost wireless data transmission based on LED luminaries. Wireless LAN environments are a major application of VLC. In these environments, VLC is used in place of traditional systems such as Wi-Fi. Because of the physical characteristics of visible light, VLC is considered to be superior to traditional radio-based communication in terms of security. However, as in all wireless systems, the security of VLC with respect to eavesdropping, signal jamming and modification must be analyzed. This paper focuses on the aspect of jamming in VLC networks. In environments where multiple VLC transmitters are used, there is the possibility that one or more transmitters will be hostile (or rogue). This leads to communication disruption, and in some cases, the hijacking of the legitimate data stream. In this paper we present the theoretical system model that is used in simulations to evaluate various rogue transmission scenarios in a typical indoor environment. The typical approach used so far in jamming analysis assumes that all disruptive transmissions may be modeled as Gaussian noise, but this assumption may be too simplistic. We analyze and compare two models of VLC jamming: the simplified Gaussian and the exact model, where the full characteristics of the interfering signal are taken into account. Our aim is to determine which methodology is adequate for studying signal jamming in VLC systems.

Dynamic analysis of rotor-bearing system by considering the transverse crack on rotor

In this study, a new improved theoretical model of rotorbearing system has been presented to analyse the behaviour of the system due to the transverse crack on the rotor. Firstly, a mathematical model of the system with a transverse crack on rotor has been developed. In the modelling, the rotor is taken as Timoshenko beam and the unbalance force also included, which vary with rotating speed. The rotor is supported by two healthy deep groove ball bearing at both ends. The contact between balls and races of the bearings is considered as nonlinear spring, whose stiffness is obtained by Hertzian contact deformation theory. After the modelling of the rotor, the equation of motion has been derived which represents the dynamic behaviour of the system. Bifurcation diagrams are used to investigate the influence of depth and size of the crack on the dynamic behaviour of rotor ball-bearings system. Results indicate that if the depth and size of the crack increase the system becomes highly chaotic and unstable.

Automatic Detection of Natural Phonological Classes in Russian Sign Language

The present paper applies Multiple Correspondence Analysis to test the validity of an existing theoretical model of the phonological system of Russian Sign Language (RSL). We show that comparing the importance of phonological features using ratio plots and MCA is a promising way of revealing non-binary oppositions in phonological systems of human languages irrespective of modality.

Seismic performance evaluation and improvement of ultra-high voltage wall bushing-valve hall system

To evaluate and improve the seismic performance of a ±800 kV ultra-high voltage (UHV) wall bushing-valve hall system, a finite element model of the system was established. Sixteen different earthquake ground motions were adopted in the analysis, and the critical seismic responses of the system were obtained. Moreover, a vibration theoretical model of the UHV wall bushing-valve hall system was established, and an investigation was conducted on the influence of different vibration components on the wall bushing seismic responses. The results indicate that the valve hall has an amplification effect on the seismic responses of the wall bushing and the vibration of the gable wall has a remarkable influence on the responses of the wall bushing. Two retrofitting measures were carried out on the valve hall to reduce the seismic responses of the wall bushing. It is concluded that increasing the stiffness of the gable wall could improve the seismic performance of the UHV wall bushing-valve hall system.

Consideration of an Ecosystem From the Standpoint of Theory and Practice of Managing Production Systems

In this article, the ecosystem is considered from the point of view of the control object. The mechanism of analysis of an ecosystem as a product of manufacturing process has been applied. The main elements that are necessary for the control system are considered. A theoretical model of the ecosystem management system has been developed. This system is aimed at making an expert assessment of a natural object as an object of nature management.

Demokracja dyskursywna w myśleniu politycznym

The paper concerns one of the concepts of democracy. Each democracy assumes that the people who live together in society need certain procedures/institutions to make binding decisions that take into consideration everybody’s interests. The notion of a deliberative democracy is used to describe a system of political decisions based on the decision-making process perceived as a combination of consensus and representative democracy. Discursive democracy is a theoretical model of a political system propagated by Jurgen Habermas and Jon Elster, and also by Joshua Cohen, Amy Gutmann and Dennis Thompson. The concept was used for the first time by Joseph M. Bessette in his work Deliberative Democracy: The Majority Principle in Republican Government in 1980, and later on in The Mild Voice of Reason in 1994. Public debate is a key aspect of the discursive concept which emphasizes the manner in which all arguments are presented in open discussion. Discursive democracy assumes a larger participation of citizens in the legislative process by means of institutionalized debates organized to complement the process of informal opinion shaping. Deliberative democracy will win an increasing number of proponents. This certainly is not only a matter of will but also of realistic opportunities to participate in the process of building a deliberative democracy.

Model of methodical system of genetic education in form 10 by the program "Biology and ecology"

Aim. The article is devoted to the development of the theoretical model of the methodical system of teaching the genetics in the 10th form, determining the components of each element of the system and links between them on the basis of theoretical analysis of the content of the educational program in biology and ecology for the 10th form, the requirements of the State standard of basic and complete general secondary education, provisions of the of the New Ukrainian school concept. Methods. Analysis, synthesis, modeling. Results. The authors have proposed a model of the methodical system of teaching genetics in the 10th form under the new program, from the point of view of the individual and the whole and the connections between the elements of the system. Conclusions. There are connections between the elements of the methodical system, these connections acquire new qualities if this system is included as a component in the system of teacher – student interaction. An important factor in functioning the methodical system is the optimal combination of goals, objectives, teaching technologies, which include the organizatio of teacher pedagogical activities and student learning; different training forms; training tools.
 Keywords: methodical system, training technologies, student interaction, goals, objectives.

Why the path to polycentricity matters: evidence from fisheries governance in Palau

AbstractPolycentricity, a complex form of governance characterized by multiple centers of semiautonomous decision‐making, has been embraced by commons scholars for the governance of complex natural resource systems. In this context, several benefits are commonly ascribed to polycentric governance systems, including enhanced adaptive capacity, mitigation of risk and provision of good institutional fit. We examine the functioning of a polycentric governance system through a qualitative case study of the governance of small‐scale fishing in the Northern Reef region of Palau where fishery resources have been declining in recent decades. By engaging a theoretical model of a functional polycentric governance system, we identify deficiencies in institutional features that partly explain why functionality is not fully achieved. Analysis of the historical transition of the governance system from community‐based to polycentric reveals that the path to polycentricity and contextual conditions constitute additional distal explanations of deficiencies in functionality. The findings suggest that transitioning from community‐based to polycentric governance risks producing conditions conducive to crowding‐out and erosion of rule compliance where the form of polycentricity assumed entails primarily higher‐level government decision‐makers with insufficient capacity for rule implementation. The case underlines the need for more refined theory concerning the emergence and functionality of different forms polycentric governance systems in various contexts.

Solar driven concentrated photovoltaic-thermoelectric hybrid system: Numerical analysis and optimization

In this study, a theoretical model of a concentrated photovoltaic-thermoelectric hybrid system has been developed based on first and second laws of thermodynamics and analysed in MATALB. A numerical method has been exploited to determine the temperatures of photovoltaic module (PV) and hot and cold side of thermoelectric generator (TEG) by iteratively solving the energy balance equations. The proposed study takes into account the effects of hot and cold side thermal resistances, thermoelectric properties, fill factor, geometry of thermoelectric module, load resistance and electrical current on the performance of the hybrid system. The results show that the optimum value of ratio of TEG load resistance to TEG internal resistance, m for maximum power output and efficiency of thermoelectric module is higher than unity. The concentration ratio should also be optimized to achieve maximum PV power output. For the fixed leg length of 5 mm and CG value of 1 kW/m2, the optimum m corresponding to maximum power output and maximum efficiency of the hybrid system is 0.5. The maximum power output and efficiency of the hybrid system increase by 5% as compared to the corresponding values of concentrated PV system. Moreover, at higher concentration ratios, the contribution of thermoelectric power to the power output of hybrid system is higher. Further, for other parameters fixed, the optimum value of CG for maximum power output of the hybrid system is 5.5 kW/m2 and it is 14% higher than the corresponding power output of CPV system alone. This improvement in the performance of hybrid system is added by the thermoelectric generator module. The results of this analysis incorporating the electrical and thermal contact resistances of thermoelectric device, may be helpful to envisage the design of a real photovoltaic-thermoelectric hybrid system.