Abstract In the water supply system, for smooth operation and management, pressure control energy consumption are important factors. However, gravity flow systems can cause leaks pipe damage when high from upstream moves downstream. Therefore, only popular way to within an acceptable range is use a reducing valve (PRV) appropriate range. using causes indiscriminate waste in operating managing system. Accordingly, Micro-Hydro Turbine (micro-hydro turbines) was proposed replace PRV provide...

We developed a hybrid algorithm for multi-objective design of water distribution networks (WDNs) in the present study. The proposed combines global search schemes differential evolution (DE) with local capabilities harmony (HS) to enhance proficiency evolutionary algorithms. This method was compared other algorithms (MOEAs) including NSGA2, SPEA2, MOEA/D and extended versions DE HS combined non-dominance criteria using several metrics. tested on four benchmark WDN problems two objective...

In multi-objective optimization computing, it is important to assign suitable parameters each problem obtain better solutions. this study, a self-adaptive harmony search (SaMOHS) algorithm developed apply the parameter-setting-free technique, which an example of methodology. The SaMOHS attempts remove some inconvenience from parameter setting and selects most adaptive during iterative solution process. To verify proposed algorithm, optimal least cost water distribution network design applied...

This study proposes variable balancing approaches for the exploration (diversification) and exploitation (intensification) of non-dominated sorting genetic algorithm-II (NSGA-II) with simulated binary crossover (SBX) polynomial mutation (PM) in multiobjective automatic parameter calibration a lumped hydrological model, HYMOD model. Two objectives—minimizing percent bias minimizing three peak flow differences—are considered six parameters The proposed approaches, which migrate focus between...

Real-time state estimation is defined as the process of calculating variable interest in real time not being directly measured. In a water distribution system (WDS), nodal demands are often considered (i.e., unknown variable) and can be estimated using pressures pipe flow rates measured at sensors installed throughout system. Nodes grouped for aggregation to decrease number unknowns (demands) WDS demand problem. This study proposes an optimal node grouping model maximize real-time accuracy....

In order to achieve the required residual chlorine concentration at end of a water network, installation re-chlorination facility for high-quality supply system is necessary. this study, optimal locations and doses were determined real systems, which require maintenance in ord3r ensure proper concentrations pipeline under present future conditions. The harmony search algorithm (HSA), meta-heuristic optimization technique, was used model. This method applied two systems South Korea verified...

This study proposes a framework for improving the robustness of water distribution systems using optimal valve installation approach with regard to system reinforcement. To improve in design, this introduces critical segment selection technique and location determination within concept segment. Using finding algorithm, unintentional isolation can be identified. select segment, multicriteria decision is applied by considering hydraulic, social economic effect. Finally, locations number...

Abstract Water distribution systems (WDSs) are major infrastructure, and it needs to consider economic, hydraulic stability, water quality safety optimal design operation of WDSs. However, the previous studies related WDS were focused on each field (i.e. design: pipe diameter, pump sizing, valve location; operation: scheduling, etc.) even though have a correlation. Therefore, achieve economic feasibility, under process, this study develops an approach considering criteria in many-objective...

The compact meander-shape configuration of planar resonators is suggested for applications in narrowband filters with quasi-elliptic characteristic. frequency response two transmission zeroes at the edges passband provided by specific symmetry coupled and controlled an appropriate choice resonator dimensions couplings between resonators. 12-pole filter 0.5% fractional bandwidth 1.775 GHz has been designed using meander-line microstrip manufactured on a double-sided YBCO film LaAlO/sub 3/...

We introduce a new system robustness index for optimizing the pump design and operation of water distribution systems. Here, is defined as system's ability to continue functioning under varying demand conditions. The maximum difference between daily minimum pressures node was taken indicator incorporated constraint in model that minimizes total cost (construction cost). Two well-known benchmark networks, Apulian Net2 were modified used demonstrate proposed model. Pareto relationship explored...

Recently, the influx of pollutants into rivers has increased owing to impacts climate and environmental change, consequently accelerating pollution river ecosystems aquatic habitats. Consequently, water quality must be precisely assessed facilitate effective management strategies by discerning different aspects deterioration enhancement identifying regulating contaminants. Understanding at a cursory glance is highly challenging, particularly for individuals lacking expertise in assessment....

We have fabricated a compact narrowband microstrip hairpin-comb filter for PCS applications by patterning double-sided YBCO films prepared pulsed laser deposition on 50-mm-diameter, 0.5-mm-thick LaAlO/sub 3/ wafer. To achieve the desired performance with size limitation, folded half-wavelength resonators are all oriented in same direction. design aid of commercially available full-wave EM simulator, ENSEMBLE, which is based method moments. The 11-pole has 0.6 dB minimum insertion loss and...

This paper proposes five methods for improving the quality of Pareto optimal solutions multiobjective water distribution network (WDN) design problems: (1) three warm initial solution methods, (2) postoptimization method, and (3) guided-search method. The were demonstrated through resilience-based Hanoi network. considering reasonable range decision variables, was identified as best method with respect to nondomination diversity obtained solutions. Then, effect known (e.g., least-cost from...

This study proposes a multi-objective optimal design approach for water distribution systems, considering mechanical system redundancy under multiple pipe failure. Mechanical is applied to the system’s hydraulic ability, based on pressure deficit between requirements abnormal conditions. The developed shows relationships failure states and redundancy, different numbers of pipe-failure conditions (e.g., first, second, third, …, tenth). Furthermore, consider extreme demand modeling, threshold...

This study proposes a novel detection model for the of cyber-attacks using remote sensing data on water distribution systems (i.e., pipe flow sensor, nodal pressure tank level and programmable logic controllers) by machine learning approaches. The most commonly used well-known algorithms k-nearest neighbor, support vector machine, artificial neural network, extreme machine) were compared to determine one with best performance. After identifying algorithm, several improved versions algorithm...

Rapid and accurate detection/localization of leakage is important to preventing severe consequences in water distribution systems, such as loss resources sinkholes. This study presents a novel two-phased approach detection localization part the 'Battle Leakage Detection Isolation Methods' (BattLeDIM). During Phase 1, data classification, feature scaling, verification were performed, where individual events detected using K-mean clustering algorithm. In 2, location was identified...

This paper addresses three-dimensional numerical analyses of the unsteady conjugate heat transfer and thermal stress for a PWR pressurizer surge line pipe with finite wall thickness, subjected to internally stratification. A primary emphasis present study is placed on investigation effects flow direction determinations transient temperature distributions in wall. In analysis, thermally stratified flows (in-surge out-surge flow) are simulated using standard κ−ε turbulent model simple...

Recently, the number of extreme rainfall events has increased because climate change. The ever-widening impervious area in urban watersheds also continuously augments runoff volume. Most measures to prevent inundation are structural, such as construction, rehabilitation, and replacement drainage facilities. Because structural require time money, nonstructural required for efficient prevention inundation. Current operations Korea focus on individual operation facilities while neglecting...