A Hierarchical Modeling Framework for Cyber-Physical Micro Energy Grid System

This paper proposes a hierarchical modeling framework for micro energy grid (MEG) from the perspective of cyber-physical integration, including three layers: object layer, integration layer and decision layer. This modeling framework can fully reveal the interplay of the information flow and energy flow in MEG. The energy hub approach is used to uniformly describe the conversion and distribution of different energy sources in the object layer. The state machine is used to describe the characteristics of energy flow and information flow and their dynamic relationships in the integration layer, where the energy flow describes the dynamic balance of energy between the supply side and demand side and the energy changes of each unit in MEG, and the information flow describes the transferring process of each unit’s operating state and the conditions triggering the state transformation. The optimization objective of the decision layer is established based on the actual requirements with optimal operation. The combination of the three-layer model forms the overall model of the MEG. Finally, a typical MEG system is taken as an example to verify the proposed modeling approach, and the results show that the proposed modeling method effectively improves the observability and optimal operation of the MEG.

Download Full-text

Energy flow modeling and optimal operation analysis of the micro energy grid based on energy hub

Energy Conversion and Management ◽

10.1016/j.enconman.2016.12.011 ◽

2017 ◽

Vol 133 ◽

pp. 292-306 ◽

Cited By ~ 100

Author(s):

Tengfei Ma ◽

Junyong Wu ◽

Liangliang Hao

Keyword(s):

Energy Flow ◽

Optimal Operation ◽

Flow Modeling ◽

Energy Hub ◽

Operation Analysis ◽

Energy Grid ◽

Grid Based

Download Full-text

State-based safety analysis method for dynamic evaluation of failure effect

Aerospace Systems ◽

10.1007/s42401-020-00073-8 ◽

2020 ◽

Author(s):

Yuqian Wu ◽

Gang Xiao ◽

Miao Wang

Keyword(s):

Failure Modes ◽

Hierarchical Modeling ◽

Safety Analysis ◽

The State ◽

Analysis Method ◽

Modeling Framework ◽

Effect Analysis ◽

Dynamic Evaluation ◽

Analysis Process ◽

Functional Logic

AbstractSystem state that represents a combined influence of internal and external system parameters on the overall failure effect plays a significant role in failure effect analysis. The traditional safety analysis methods can hardly evaluate the overall failure impact due to the dynamic failure behaviors in diverse system interaction situations. To overcome this problem, this paper proposes a state-based safety analysis method for dynamic evaluation of the failure effect combining the situation factor. First, a hierarchical modeling framework that includes functional logic, physical architecture, and the failure mode is constructed, and then the cross-linking relationships between items are characterized by the state machines. Particularly, the event transmission mechanism and the global attribute updating mechanism are designed to realize the state synchronization of various systems, thus enabling the global propagation of failure. The feasibility of the proposed method is verified by simulations. The Enterprise Architect platform is used to model the aircraft integrated surveillance system and analyze the effects of different failure modes in typical situations. The proposed method complements the failure effect evaluation accuracy considering the dynamic interaction situations, thus realizing the global perception of the safety state, enhancing the dynamics and integrity of the failure effect analysis process.

Download Full-text

Method and Application of Operational Architecture Modeling Based on Information Flow Analysis

Journal of Systems Science and Information ◽

10.1515/jssi-2016-0040 ◽

2016 ◽

Vol 4 (1) ◽

pp. 40-55

Author(s):

Yinghui Yang ◽

Jianhua Li ◽

Qingwei Meng ◽

Mingli Nan

Keyword(s):

Information Flow ◽

Process Analysis ◽

Flow Analysis ◽

Modeling Framework ◽

Operational Process ◽

Information Flow Analysis ◽

Modeling Process ◽

Architecture Framework ◽

Architecture Modeling ◽

Operational Activity

Abstract To strengthen operational process analysis and normalize information requirements description in systemic operations based on information systems, a new operational architecture modeling method is proposed from the perspective of information flow analysis. An operational architecture modeling framework based on information flow analysis is established by referring to American department of defense architecture framework (DoDAF V2.0). Concepts of entities, relationships, attributes and mapping rules are defined. Operational activity model, operational nod model and information alternation model are constructed. Finally, aerial assault operation is taken as an example to demonstrate the modeling process. Simulation results show that operational process analysis is more refined and information requirement descriptions are more visible, normal and clear, which validate the feasibility and validity of the method and models.

Download Full-text

School learning climate in the lens of parental involvement and school leadership: lessons for inclusiveness among public schools

Smart Learning Environments ◽

10.1186/s40561-020-00139-2 ◽

2020 ◽

Vol 7 (1) ◽

Author(s):

Jason Alinsunurin

Keyword(s):

Public Schools ◽

School Improvement ◽

Parental Involvement ◽

School Leadership ◽

Hierarchical Modeling ◽

Substantial Reduction ◽

Learning Climate ◽

Modeling Framework ◽

Research Attention ◽

School Learning

Abstract Prior literature has shown that school learning climate is critical in helping individual learners meet their educational objectives. In this paper, the role of parental involvement in shaping the school learning climate is explored within a multilevel and hierarchical modeling framework using data from the 2015 PISA round. As the schools’ social and relational character, we find that reducing learning barriers is a critical challenge for school leadership. A welcoming environment for parents, as well as the effective design of effective forms of two-way communications, are positively associated with a substantial reduction in the barriers to improving teacher management’s learning climate. We also find that public schools facing social and educational inclusiveness challenges can dramatically enhance their learning environment by activating specific parental involvement mechanisms. Similarly, principal’s leadership in framing and communicating goals and curricular development to the school is also found to be significant for inclusiveness. However, parental involvement is also found to have potential tensions with school management. The worsening of the learning climate may arise due to pressures brought about by laws requiring parental involvement in schools. Because the learning climate is composed of a wide variety of relationships between and within schools, this work demonstrates that parental involvement is an integral part of school leadership and the school improvement process. Further research attention is encouraged to understand the tensions between teacher roles, principal leadership, and parental involvement through employing other quantitative or qualitative research designs.

Download Full-text

Optimal operation of a multi-generation district energy hub based on electrical, heating, and cooling demands and hydrogen production

Applied Energy ◽

10.1016/j.apenergy.2021.118453 ◽

2022 ◽

Vol 309 ◽

pp. 118453

Author(s):

Amir Ebrahimi-Moghadam ◽

Mahmood Farzaneh-Gord

Keyword(s):

Hydrogen Production ◽

Optimal Operation ◽

Electrical Heating ◽

District Energy ◽

Energy Hub ◽

Heating And Cooling

Download Full-text

Inertia-Driven Controlled Passive Actuation

Volume 3: Multiagent Network Systems; Natural Gas and Heat Exchangers; Path Planning and Motion Control; Powertrain Systems; Rehab Robotics; Robot Manipulators; Rollover Prevention (AVS); Sensors and Actuators; Time Delay Systems; Tracking Control Systems; Uncertain Systems and Robustness; Unmanned, Ground and Surface Robotics; Vehicle Dynamics Control; Vibration and Control of Smart Structures/Mech Systems; Vibration Issues in Mechanical Systems ◽

10.1115/dscc2015-9786 ◽

2015 ◽

Cited By ~ 3

Author(s):

Douwe Dresscher ◽

Theo J. A. de Vries ◽

Stefano Stramigioli

Keyword(s):

Energy Flow ◽

Legged Locomotion ◽

Continuously Variable Transmission ◽

The State ◽

Rate Of Change ◽

Storage Element ◽

Abstraction Layer ◽

Variable Transmission ◽

Alternative Means ◽

Flow Through

A serious problem with using electrical actuators in legged locomotion is the significant energy loss. For this reason, we propose and analyse an alternative means of actuation: Controlled Passive Actuation. Controlled Passive Actuation aims at reducing the energy flow through electric actuators by actuating with a combination of an energy storage element and a Continuously Variable Transmission. In this work, we present a method where we apply a Continuously Variable Transmission with a storage element in the form of a mass to change the state of another mass (“the load”). An abstraction layer is created to abstract the inertia-driven Controlled Passive Actuation to a source of effort, a force actuator. On this abstracted system, feedback control can be applied to achieve control goals such as path tracking. With simulations and experiments, we show that inertia-driven Controlled Passive Actuation can be used to control the state of an (inertial) load. The experimental results show that the performance of the system is affected by the internal dynamics and limited rate of change of the transmission ratio of the Continuously Variable Transmission.

Download Full-text

Informed Democracy

Advances in Library and Information Science - Library and Information Science Research in Asia-Oceania ◽

10.4018/978-1-4666-5158-6.ch002 ◽

2014 ◽

pp. 8-23

Author(s):

Insa Haidn ◽

Helen Partridge ◽

Christine Yates

Keyword(s):

Qualitative Study ◽

Information Flow ◽

Information Sources ◽

Structured Interview ◽

Party Politics ◽

The State ◽

Sense Making ◽

Theoretical Understanding ◽

Personal Politics ◽

Scholarly Inquiry

This chapter presents the preliminary findings of a qualitative study exploring people’s information experiences during the 2012 Queensland State election in Australia. Six residents of South East Queensland who were eligible to vote in the state election participated in a semi-structured interview. The interviews revealed five themes that depict participants’ information experience during the election: information sources, information flow, personal politics, party politics, and sense making. Together these themes represent what is experienced as information, how information is experienced, as well as contextual aspects that were unique to voting in an election. The study outlined here is one in an emerging area of enquiry that has explored information experience as a research object. This study has revealed that people’s information experiences are rich, complex, and dynamic, and that information experience as a construct of scholarly inquiry provides deep insights into the ways in which people relate to their information worlds. More studies exploring information experience within different contexts are needed to help develop our theoretical understanding of this important and emerging construct.

Download Full-text