scholarly journals Optimization in VHTS Satellite System Design with Irregular Beam Coverage for Non-Uniform Traffic Distribution

2021 ◽  
Vol 13 (13) ◽  
pp. 2642
Author(s):  
Flor G. Ortiz-Gomez ◽  
Miguel A. Salas-Natera ◽  
Ramón Martínez ◽  
Salvador Landeros-Ayala
Keyword(s):  
Satellite System ◽  
Coverage Area ◽  
Traffic Demand ◽  
Coverage Error ◽  
Traffic Distribution ◽  
Previous Algorithm ◽  
And Performance ◽  
The Cost ◽  
Very High

Very High Throughput Satellites (VHTS) have a pivotal role in complementing terrestrial networks to increase traffic demand. VHTS systems currently assume a uniform distribution of traffic in the service area, but in a real system, traffic demands are not uniform and are dynamic. A possible solution is to use flexible payloads, but the cost of the design increases considerably. On the other hand, a fixed payload that uses irregular beam coverage depending on traffic demand allows maintaining the cost of a fixed payload while minimizing the error between offered and required capacity. This paper presents a proposal for optimizing irregular beams coverage and beam pattern, minimizing the costs per Gbps in orbit, the Normalized Coverage Error, and Offered Capacity Error per beam. We present the analysis and performance for the case study and compare it with a previous algorithm for a uniform coverage area.

scholarly journals Maximizing Throughput of The GEO Satellite At C/Ku Bands

2021 ◽  
Author(s):  
Sabir Hussain ◽  
Ghulam Jaffer
Keyword(s):  
Rural Areas ◽  
High Performance ◽  
Satellite System ◽  
Data Traffic ◽  
Coverage Area ◽  
Geo Satellite ◽  
Cost Efficient ◽  
And Performance ◽  
The Cost ◽  
Ku Band

Abstract The need for broadband data has increased speedily but in underserved rural areas, the mobile connectivity of 3G and LTE is still a significant challenge. By looking at the historical trend, the data traffic and the internet are still expected to grow in these areas [1]. The next generation of satellites is trying to decrease the cost per MB having the advantage of higher throughput and availability. To maintain the performance of the link, choosing an appropriate frequency is evident. A multi-beam satellite system can fulfill the demand and performance over a coverage area. The high throughput satellites (HTS) fulfill this requirement using C and Ku bands. In this paper, we present the benefits of using Ku-band on the user site and the composite of C and Ku bands on the gateway site. This configuration has proved to be a cost-efficient solution with high performance over the traditional straight configuration. The data rate is improved five times both on upstream and downstream as compared to the existing available FSS system. Moreover, it has got an advantage to Ku-band user that they would enjoy the significant improvement in the performance without upgrading their systems.

scholarly journals Proposed Policy Preventive Maintenance Machine Moriseiki NH 4000 DCG Method Of Reliability Center Maintenance (RCM) And Risk Based Maintenance (RBM) Case Study PT. Pudak Scientific

2018 ◽  
Vol 2 (01) ◽  
Author(s):  
Fachri Husaini
Keyword(s):  
Production Capacity ◽  
Cost Of Care ◽  
Maintenance Policy ◽  
Performance Loss ◽  
Acceptance Set ◽  
Maintenance Activities ◽  
And Performance ◽  
The Cost ◽  
A Company

PT Pudak Scientific is a company engaged in the manufacture of aircraft parts industry. Meeting the precise and timely demand of aerospace parts from customers becomes a major corporate responsibility. However, Loss Revenue often occurs due to engine breakdown. So that cause because the production target is not achieved, the product reject, and the delay of delivery. One of the machines that often experience breakdown is Mori seiki NH4000 DCG. Mori seiki NH4000 DCG is the finishing machine for Blank fork End product. The demand for this part is quite large, making it a tough task for the Mori Seiki NH4000 DCG machine. But because the breakdown of the machine is high enough to cause production targets every month are often not met. In addition, Maintenance activities that have not noticed the characteristics of engine damage, as well as the distribution of historical data of the machine causing less effective and efficient actions resulted in substantial Maintenance costs. Based on the results of risk analysis of Mori Seiki NH4000 DCG engine damage, in terms of performance loss system caused by a large enough that is 3.773% of machine production capacity per year. This figure exceeds the risk acceptance criteria by the company that is 2%. Therefore it is necessary to find the appropriate Maintenance policy for the Mori Seiki NH4000 DCG machine. The approach is to use Reliability Centeres Maintenance and Risk Based Maintenance. Based on the above two approaches obtained the appropriate interval time so that the Maintenance activities more effective and can improve the efficiency of treatment by reducing the cost of care previously Rp167.506.286, - per year, to Rp 96.147.061, - per year. With the policy is expected to reduce engine breakdown and performance loss caused. So the number of risks that arise for the future are within the criteria of acceptance set by the company.

scholarly journals Borehole Rehabilitation: A Case Study in the Dunkwa Mining Town

2020 ◽  
Vol 20 (2) ◽  
pp. 11-17
Author(s):  
A. Ewusi ◽  
J. Seidu
Keyword(s):  
Water Supply ◽  
Central Region ◽  
Pumping Test ◽  
Implementation Cost ◽  
Mining Town ◽  
Long Time ◽  
Borehole Camera ◽  
The Cost ◽  
Very High

Rehabilitation works were carried out on boreholes in the Dunkwa Mining town in the Central Region of Ghana. These works were carried out because the boreholes had lost their original yields due to clogging, corrosion and encrustation and had been abandoned for a long time. The cost of drilling a new well and assessing the productivity of the well is $4,500 which is more expensive that carrying out rehabilitation works which is cheaper, about $800. Also, the initial yields of the boreholes were very high according to the feasibility report which is not a common characteristic of the rocks in the area. Camera inspection followed by rehabilitation, pre and post pumping tests were carried out to assess whether there has been an improvement in their yield after the exercise and that the yield obtained will be adequate for a water supply design. Results show that all the boreholes had an improvement in their yields (57.19 - 259.80 %) after the rehabilitation. It can therefore be concluded that rehabilitation is effective in restoring boreholes to their original yields. Organisations drilling boreholes to communities can take advantage of rehabilitation of the existing boreholes located in the communities which are high yielding, thereby reducing project implementation cost. Keywords: Borehole Rehabilitation, Borehole Yields, Borehole Camera Inspection, Pumping Test

Ubiquitous Positioning Technologies for Modern Intelligent Navigation Systems

2005 ◽  
Vol 59 (1) ◽  
pp. 91-103 ◽  
Author(s):  
Guenther Retscher ◽  
Allison Kealy
Keyword(s):  
Dead Reckoning ◽  
Satellite System ◽  
Indoor Environments ◽  
Navigation Systems ◽  
Pedestrian Navigation ◽  
First Case ◽  
And Performance ◽  
Navigation Service ◽  
Global Navigation Satellite

Recently new location technologies have emerged that can be employed in modern advanced navigation systems. They can be employed to augment Global Navigation Satellite System (GNSS) positioning techniques and dead reckoning as they offer different levels of positioning accuracies and performance. An integration of other technologies is especially required in indoor and outdoor-to-indoor environments. The paper gives an overview of the newly developed ubiquitous positioning technologies and their integration in navigation systems. Furthermore two case studies are presented, i.e., the improvement of land vehicle safety using Augmented Reality (AR) technologies and pedestrian navigation services for the guidance of users to certain University offices. In the first case study the integration of map matching into a Kalman filter approach is performed (referred to as “Intelligent Vehicle Navigation”) and its principle is briefly described. This approach can also be adapted for the pedestrian navigation service described in the second case study.

scholarly journals An Imitation and Heuristic Method for Scheduling with Subcontracted Resources

Mathematics ◽  
2021 ◽  
Vol 9 (17) ◽  
pp. 2098
Author(s):  
Anna Antonova ◽  
Konstantin Aksyonov ◽  
Olga Aksyonova
Keyword(s):  
Renewable Resources ◽  
Heuristic Method ◽  
Scheduling Problem ◽  
Due Dates ◽  
Start Time ◽  
Fold Reduction ◽  
And Performance ◽  
The Cost

A scheduling problem with subcontracted resources is widely spread and is associated with the distribution of limited renewable and non-renewable resources, both own and subcontracted ones based on the work’s due dates and the earliest start time. Scheduling’s goal is to reduce the cost of the subcontracted resources. In the paper, application of a few scheduling methods based on scheduling theory and the optimization algorithm is considered; limitations of these methods’ application are highlighted. It is shown that the use of simulation modeling with heuristic rules for allocation of the renewable resources makes it possible to overcome the identified limitations. A new imitation and heuristic method for solving the assigned scheduling problem is proposed. The comparison of the new method with existing ones in terms of the quality of the found solution and performance of the methods is carried out. A case study is presented that allowed a four-fold reduction of the overall subcontracted resources cost in a real project portfolio.

Design and Implementation of Monitoring System Using PLC for ICT-Integrated Fish Farm

2018 ◽  
pp. 119-138
Keyword(s):  
Smart Grid ◽  
Power Plants ◽  
Fish Farms ◽  
Design And Implementation ◽  
The Republic ◽  
The Cost ◽  
Communication Equipment ◽  
Very High ◽  
Mass Stranding

The key to a Smart Grid is to manage electric power within the grid efficiently. There are many advantages in building a smart grid but it is useful in using it as an ancillary power grid for the business that can be damaged extensively due to blackout or interruption of power caused by hurricanes at power plants, substations and other related infrastructures. Fish farms in the republic of Korea use a considerable power and suffer a serious loss from a mass stranding caused by power interruptions. This chapter introduces a case study which aims to design a power line-based communication for the fish farms/vertical farms as the cost of constructing an internet network at the farm with UTP cables and other communication equipment is very high. This section includes a designing technique for the entire system and its necessary applications.

scholarly journals A Methodology for Economic Evaluation of Cloud-Based Web Applications

2016 ◽  
Vol 15 (06) ◽  
pp. 1555-1578 ◽  
Author(s):  
Josep Domenech ◽  
Raul Peña-Ortiz ◽  
Jose A. Gil ◽  
Ana Pont
Keyword(s):  
Web Applications ◽  
Memory Storage ◽  
Costs And Benefits ◽  
Business Managers ◽  
Web Based ◽  
Business Plans ◽  
And Performance ◽  
The Cost ◽  
Traditional Performance

Cloud technology is an attractive infrastructure solution to optimize the scalability and performance of web applications. The workload of these applications typically fluctuates between peak and valley loads and sometimes in an unpredictable way. Cloud systems can easily deal with this fluctuation because they provide customers with an almost unlimited on-demand infrastructure capacity using a pay-per-use model, which enables internet-based companies to pay for the actual consumption instead of peak capacity. In this paradigm, this paper links the business model of an internet-based company to the performance evaluation of the infrastructure. To this end, the paper develops a new methodology for assessing the costs and benefits of implementing web-based applications in the cloud. Traditional performance models and indexes related to usage of the main system resources (such as processor, memory, storage, and bandwidth) have been reformulated to include new metrics (such as customer losses and service costs) that are useful for business managers. Additionally, the proposed methodology has been illustrated with a case study of a typical e-commerce scenario. Experimental results show that the proposed metrics enable internet-based companies to estimate the cost of adopting a particular cloud configuration more accurately in terms of the infrastructure cost and the cost of losing customers due to performance degradation. Consequently, the methodology can be a useful tool to assess the feasibility of business plans.

Kajian Penerapan Mekanisasi Pertanian Berbasis Usaha Pelayanan Jasa Alat dan Mesin Pertanian (UPJA) untuk Sistem Produksi Padi di Kabupaten Banyumas, Purbalingga dan Banjarnegara

2021 ◽  
Vol 45 (2) ◽  
pp. 120
Author(s):  
Aninda Ayu Arizka ◽  
Bambang Purwantana ◽  
Lilik Soetiarso
Keyword(s):  
Production System ◽  
Soil Conditions ◽  
Working Capacity ◽  
Minimum Area ◽  
Coverage Area ◽  
Service Business ◽  
Agricultural Equipment ◽  
Agricultural Mechanization ◽  
And Performance ◽  
The Cost

<p><em>The use of agricultural equipment and machinery is one way to increase the productivity and efficiency of farming. In order to accelerate the adoption of agricultural equipment and machinery as part of the application of agricultural mechanization, one of which is through the agricultural equipment and machinery service business/usaha pelayanan jasa alat dan mesin pertanian (UPJA). This study aims to analyze the application of agricultural mechanization, especially related to the use of equipment and machinery by UPJA for the rice production system in Banyumas, Purbalingga and Banjarnegara Regencies. Data were obtained, including the ownership of the equipment and machinery, the extent of coverage carried out by the UPJA, the cost of renting the equipment and machinery determined by each UPJA, and the costs incurred for the operation of the equipment and machinery in each UPJA. The results of the calculation of the working capacity of the hand tractor obtained an average of 0.07 ha hour<sup>-1</sup>. The lack of ability of equipment and machinery operators as well as the topography of the area and soil conditions are factors that affect the working capacity of the hand tractor in this study. UPJA which has a coverage area of more than the Break Event Point (BEP) value means that the UPJA has met the minimum area that must be processed to break even. The results of the calculation of the B/C ratio are that 9 UPJAs are feasible because the B/C ratio &gt; 1 and 10 UPJAs are not feasible because of the B/C ratio &lt; 1. UPJA whose business is not feasible is expected to improve the managerial and performance of UPJA.</em></p>

Bit Run Optimization through Simulation: A Case Study

2012 ◽  
Vol 433-440 ◽  
pp. 2387-2393
Author(s):  
E. Novieri ◽  
S. Torfi
Keyword(s):  
Flow Rate ◽  
Penetration Rate ◽  
The Other ◽  
Time Dependent ◽  
Factors Affecting ◽  
Drilling Cost ◽  
The Cost ◽  
Very High ◽  
Mud Flow

The usual objective when drilling a well is to drill for the lowest overall cost. At first sight, this may seem like a requirement to drill as fast as possible, since many of the costs, such as the rig day rate, wages etc., are time dependent. However, some costs are fixed, for example the cost of the bit, and it may not always be economic to pay a very high cost for a bit that drills somewhat faster, particularly if the other costs are low.In this paper, some first 3465 feet of a reservoir lithology including four bit runs are analyzed so that factors affecting penetration rate are optimized and the lowest possible well cost is achieved. The effects of using other bit types, WOB, RPM and bit hydraulics are simulated in an attempt to determine the optimized parameters, which result in the lowest drilling cost. In this study, reducing both nozzle sizes and mud flow rate, the horse power dissipated at the bit is increased, hence reducing cost per foot of drilled interval. As it is noted, by using this simulator, 17% of the original well cost is saved, which is a considerable amount of money.

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