scholarly journals Cost-Effective Inter-LMA Domain Distributed Mobility Control Scheme in PMIPv6 Networks

2012 ◽  
Vol 19C (3) ◽  
pp. 191-208 ◽  
Author(s):  
Soon-Ho Jang ◽  
Jong-Pil Jeong
Keyword(s):  
Cost Effective ◽  
Mobility Control ◽  
Control Scheme

scholarly journals Study and Implementation of a Cost-Effective 3L-Active Rectifier for DC Collection in WECS

2019 ◽  
Vol 118 ◽  
pp. 02065
Author(s):  
Muhammad Luqman ◽  
Gang Yao ◽  
Lidan Zhou ◽  
Di Yang ◽  
Anil Lamichhane
Keyword(s):  
Low Cost ◽  
Cost Effective ◽  
Cost Comparison ◽  
Multilevel Converters ◽  
Wind Generators ◽  
Active Rectifier ◽  
Vienna Rectifier ◽  
Three Phase ◽  
Control Scheme ◽  
Parallel Configuration

Power electronic converters are widely used in wind energy conversion system (WECS) applications. Therefore, with the increasing manufacturing capacity of multi-MW wind generators, multi-level converters, or parallel configuration of converters are becoming more attractive solutions towards DC collection from the wind generator. Among the multilevel converters, three-level full-scale neutral point diode clamped (3L-NPC) converter are using extensively for such applications in order to reduce the voltage stress on the semiconductor devices. In this article, a comparative study based on several devices used by NPC, capacitor clamped (CC) as well as Vienna rectifier has been done. Furthermore, their estimated cost comparison and complexity of control switches have been debated. By keeping in view the merits and demerits of these rectifiers, a low cost three-level active rectifier having a smaller number of active switches with a simple control scheme have been implemented. Considering a three-phase electric grid as a generated source, a 2.2KW low-cost three-level Vienna rectifier is simulated using MATLAB/Simulink. DSP (TMS320F28335) based experimental results ratify the simulated circuit with THD<5%.

Experimental Evaluation of System Performance for a Machine Tool Cooler Using Inverter Driven Control

2011 ◽  
Vol 189-193 ◽  
pp. 4073-4076
Author(s):  
Fu Jen Wang ◽  
Kuei I Tsai ◽  
Tong Bou Chang ◽  
Hao Chuan Lee ◽  
Yu Jun Lin
Keyword(s):  
Machine Tool ◽  
Capillary Tube ◽  
Cooling Water ◽  
Cost Effective ◽  
Coolant Temperature ◽  
Cooling Water Temperature ◽  
Control Scheme ◽  
Expansion Valve ◽  
Tool Cooling ◽  
Dramatic Variation

Highly accurate manufacture in machining industry cannot be achieved without precise temperature control of the cooling water. However, the machine tool coolers are facing the control hunting of coolant temperature and the dramatic variation of heat load in high-accuracy machining. In this study, experimental investigation on inverter driven compressor for capacity control has been proposed. Effects of using capillary tube and thermostatic expansion valve along with inverter driven control scheme have been investigated comprehensively. Cooling performance and power consumption of the cooler system have been measured at different frequency (hertz) of inverter under specific cooling water temperature. The experimental results reveal that the inverter driven cooler is cost-effective and energy-efficient for high-precision machine tool cooling.

scholarly journals Small and Medium-Scale River Flood Controls in Highly Urbanized Areas: A Whole Region Perspective

Water ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 182 ◽  
Author(s):  
Zengmei Liu ◽  
Yuting Cai ◽  
Shangwei Wang ◽  
Fupeng Lan ◽  
Xushu Wu
Keyword(s):  
Flood Control ◽  
Cost Effective ◽  
Rapid Urbanization ◽  
Guangzhou City ◽  
Medium Scale ◽  
Inundation Depth ◽  
Control Scheme ◽  
Social And Economic Development ◽  
Urbanized Areas

While rapid urbanization promotes social and economic development, it poses a serious threat to the health of rivers, especially the small and medium-scale rivers. Flood control for small and medium-scale rivers in highly urbanized areas is particularly important. The purpose of this study is to explore the most effective flood control strategy for small and medium-scale rivers in highly urbanized areas. MIKE 11 and MIKE 21 were coupled with MIKE FLOOD model to simulate flooding with the flood control standard, after which the best flooding control scheme was determined from a whole region perspective (both the mainstream and tributary conditions were considered). The SheGong River basin located near the Guangzhou Baiyun international airport in Guangzhou city over south China was selected for the case study. The results showed that the flooding area in the basin of interest accounts for 42% of the total, with maximum inundation depth up to 0.93 m under the 20-year return period of the designed flood. The flood-prone areas are the midstream and downstream where urbanization is high; however the downstream of the adjacent TieShan River is still able to bear more flooding. Therefore, the probable cost-effective flood control scheme is to construct two new tributaries transferring floodwater in the mid- and downstream of the SheGong River into the downstream of the TieShan River. This infers that flood control for small and medium-scale rivers in highly urbanized areas should not simply consider tributary flood regimes but, rather, involve both tributary and mainstream flood characters from a whole region perspective.

Optimal Mobility Control of Sensors in the Event of a Disaster

2019 ◽  
Vol 14 (3) ◽  
pp. 500-507
Author(s):  
Yuichi Nakamura ◽  
Masaki Ito ◽  
Kaoru Sezaki ◽  
◽  
Keyword(s):  
Mobility Control ◽  
Sensor Nodes ◽  
Human Beings ◽  
Evacuation Simulation ◽  
Agent Based ◽  
Kriging Variance ◽  
Crowd Sensing ◽  
Control Scheme ◽  
Preceding Result ◽  
High Quality Information

Disasters have caused serious damage on human beings throughout their long history. In a major natural disaster such as an earthquake, a key to mitigate the damage is evacuation. Evidently, secondary collateral disasters is account for more casualty than the initial one. In order to have citizens to evacuate safely for the sake of saving their lives, collecting information is vital. However at times of a disaster, it is a difficult task to gain environmental information about the area by conventional way. One of the solutions to this problem is crowd-sensing, which regards citizens as sensors nodes and collect information with their help. We considered a way of controlling the mobility of such sensor nodes under limitation of its mobility, caused by road blockage, for example. Aiming to make a mobility control scheme that enables high-quality information collection, our method uses preceding result of the measurement to control the mobility. Here it uses kriging variance to do that. We evaluated this method by simulating some measurements and it showed better accuracy than baseline. This is expected to be a method to enable a higher-quality input to the agent-based evacuation simulation, which helps to guide people to evacuate more safely.

scholarly journals Distributed Identifier-Locator Mapping Management in Mobile ILNP Networks

Electronics ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 58 ◽  
Author(s):  
Moneeb Gohar ◽  
Jin-Ghoo Choi ◽  
Waleed Ahmed ◽  
Arif Ur Rahman ◽  
Muhammad Muzammal ◽  
...  
Keyword(s):  
Mobile Host ◽  
Mobility Control ◽  
Handover Delay ◽  
Mobile Hosts ◽  
Total Transmission ◽  
Control Scheme ◽  
Control Schemes ◽  
Control Traffic ◽  
Dynamic Domain ◽  
Domain Name Service

In the Identifier Locator Network Protocol (ILNP) networks, the existing mobility control schemes based on the centralized entity, called the Dynamic Domain Name Service (DDNS) server, such that all the control traffic is processed at the DDNS server. However, the centralized mobility schemes have significant limitations, such as control traffic overhead at the server and large handover delay. In order to resolve these issues, we propose a new mobility control scheme for ILNP networks, which manages the identifier-locators (ID-LOCs) in the fully distributed manner. In our scheme, each domain has a dedicated mobile DDNS (m-DDNS) server at the site border router (SBR). The m-DDNS server maintains two databases; i.e., home host register (HHR) and visiting host register (VHR), to support the roaming of mobile hosts. When a mobile host roams into a domain, the m-DDNS server in the visiting domain registers the host’s ID-LOC in the VHR and requests the update of HHR to the m-DDNS server in the home domain. Since the m-DDNS servers communicate each other directly, the ID-LOC mappings are managed without involvement of any central entities. We analyzed our proposed mobility scheme via numerical analysis and compared its performance with those of existing schemes. Numerical results showed that our scheme outperforms the existing mobility control schemes substantially in terms of control traffic overhead at the servers, total transmission delay and handover delay.

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