Conceptual model for runway change procedure in Guarulhos International Airport based on SODAR data

2016 ◽  
Vol 120 (1227) ◽  
pp. 725-734 ◽  
Author(s):  
W. Luiz Silva ◽  
F.L. Albuquerque Neto ◽  
G.B. França ◽  
M.R. Matschinske
Keyword(s):  
Conceptual Model ◽  
Wind Direction ◽  
Average Duration ◽  
Air Traffic Controller ◽  
Sodar Data ◽  
International Airport ◽  
Weak Intensity ◽  
Airport Infrastructure ◽  
Sonic Detection ◽  
The Impact

ABSTRACTIn this work, we qualify and quantify the advantages of using SODAR (sonic detection and ranging) from current scenarios of Aeronautical Meteorology, with the goal of establishing a conceptual model for runway change procedures at Guarulhos International Airport (São Paulo, Brazil). The methods consist of analysing data from the Department of Airspace Control (DECEA) and Brazilian Airport Infrastructure (Infraero) about the reports of runway changes in Guarulhos in addition to SODAR data from September 2011 and December 2013. It is noted that in 234 analysed cases of runway change, there were significant periods of weak-intensity wind on the surface as well as the anticipated modification wind direction at altitude detected by sonic detection and ranging (SODAR), indicating future changes in levels closer to the surface. By examining the intersection of both scenarios, it is possible to observe that there is enough time for the air traffic controller to anticipate the needed runway change while minimising the impact on the aircraft flow, and this period has an average duration of 1 hour and 24 minutes. This confirms that the preliminary analysis of the information provided by SODAR can help predict alterations in wind direction, requiring redirection and bringing advantages in economic and security terms.

scholarly journals FAKTOR YANG BERPENGARUH TERHADAP STRESS KERJA PADA PEKERJA AIR TRAFFIC CONTROLLER

2019 ◽  
Vol 17 (2) ◽  
Author(s):  
Aliyatur Rofi’a ◽  
Umi Rahayu ◽  
Suprijandani .
Keyword(s):  
Work Stress ◽  
Traffic Accidents ◽  
Simple Random Sampling ◽  
Cross Sectional Study ◽  
Air Traffic ◽  
Observational Research ◽  
Cross Sectional ◽  
Air Traffic Controller ◽  
International Airport ◽  
The Impact

Air Traffic Controller is a job that plays an important role in air traffic in charge of controlling aircraft activity. So, it is required to always be ready and not to make the slightest mistake given the impact of air traffic accidents. The complexity and responsibility on the physical health of workers and the chaos of air traffic and aircraft accidents that can endanger the lives of other individuals. The purpose of this study was determine the factors that influence work stress on Air Traffic Controller workers at Juanda International Airport in 2019.This type of research is analytic observational research with a cross-sectional study design. The procedure of data collection is done by observation, interviewing, disseminating and filling out the related questionnaire, and testing the work environment. The sample in this study were 60 Air Traffic Controller workers by simple random sampling. Data were analyzed by univariate, bivariate, and multivariate with statistical test namely Logistic Regression.The results of work stress assessment showed that the work stress level of most workers experienced a mild work stress of 55%, workers who experienced moderate work stress as much as 45%, while workers who experienced severe work stress and workers who did not experience work stress did not exist. Factors that influence the work stress on Air Traffic Controller workers at Perum LPPNPI Madya Surabaya Branch Juanda International Airport in 2019 are workload, education, and work routine.It is recommended to measure lighting, temperature, and humidity regularly in the workspace, scheduling work hours for sure, checking work stress, adjusting to work, and maximizing rest time. Keywords : Air Traffic Controller, Workload, Work Stress

scholarly journals Patient preferences for use of virtual consultations in an orthopaedic rehabilitation setting: Results from a discrete choice experiment

2021 ◽  
pp. 135581962110354
Author(s):  
Anthony W Gilbert ◽  
Emmanouil Mentzakis ◽  
Carl R May ◽  
Maria Stokes ◽  
Jeremy Jones
Keyword(s):  
Conceptual Model ◽  
Discrete Choice Experiment ◽  
Discrete Choice ◽  
Patient Preferences ◽  
Choice Experiment ◽  
Best Practice ◽  
Time Of Day ◽  
Problem Area ◽  
Fractional Factorial ◽  
The Impact

Objective Virtual Consultations may reduce the need for face-to-face outpatient appointments, thereby potentially reducing the cost and time involved in delivering health care. This study reports a discrete choice experiment (DCE) that identifies factors that influence patient preferences for virtual consultations in an orthopaedic rehabilitation setting. Methods Previous research from the CONNECT (Care in Orthopaedics, burdeN of treatmeNt and the Effect of Communication Technology) Project and best practice guidance informed the development of our DCE. An efficient fractional factorial design with 16 choice scenarios was created that identified all main effects and partial two-way interactions. The design was divided into two blocks of eight scenarios each, to reduce the impact of cognitive fatigue. Data analysis were conducted using binary logit regression models. Results Sixty-one paired response sets (122 subjects) were available for analysis. DCE factors (whether the therapist is known to the patient, duration of appointment, time of day) and demographic factors (patient qualifications, access to equipment, difficulty with activities, multiple health issues, travel costs) were significant predictors of preference. We estimate that a patient is less than 1% likely to prefer a virtual consultation if the patient has a degree, is without access to the equipment and software to undertake a virtual consultation, does not have difficulties with day-to-day activities, is undergoing rehabilitation for one problem area, has to pay less than £5 to travel, is having a consultation with a therapist not known to them, in 1 weeks’ time, lasting 60 minutes, at 2 pm. We have developed a simple conceptual model to explain how these factors interact to inform preference, including patients’ access to resources, context for the consultation and the requirements of the consultation. Conclusions This conceptual model provides the framework to focus attention towards factors that might influence patient preference for virtual consultations. Our model can inform the development of future technologies, trials, and qualitative work to further explore the mechanisms that influence preference.

scholarly journals Study on Companies from the Energy Sector from the Perspective of Performance through the Operating Cash Flow

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3667
Author(s):  
Claudia Diana Sabău-Popa ◽  
Luminița Rus ◽  
Dana Simona Gherai ◽  
Codruța Mare ◽  
Ioan Gheorghe Țara
Keyword(s):  
Labor Productivity ◽  
Cash Flow ◽  
Stock Exchange ◽  
Average Duration ◽  
Significant Negative Correlation ◽  
Cash Flows ◽  
Energy Sector ◽  
Or Management ◽  
Operating Cash Flow ◽  
The Impact

In this paper we analyzed the link between companies’ performance, in terms of cash and income, and the labor productivity or management rates, in case of the companies from the energy sector listed on the Bucharest Stock Exchange. We focused on the energy sector because of the impact that its expansion has on the evolution of economies around the world and because of its dynamics in the sense of gradually shifting to the use of energy from renewable sources. We have used panel regression models to analyze the operating cash flow and the profitability rates and the determination of a causal or dependency relationship with labor productivity or management rates. The results of this study show a significant negative correlation between operating cash flows and the average duration of stock rotation, and no correlation between productivity and the operating cash flow. Instead, the average duration of stock turnover does not at all influence the profitability rates, and productivity is always significant for the return on assets, ie forthe return on equitywith a positive coefficient, as expected. The gap between the average duration of payment of suppliers and the average duration of receivables does not significantly influence neither the cash flow nor the rates of return.

The effect of the 2018 Giro d’Italia on Israel’s tourism firm value

2019 ◽  
Vol 25 (7) ◽  
pp. 1070-1083 ◽  
Author(s):  
Juan Luis Nicolau ◽  
Abhinav Sharma ◽  
Tal Zarankin
Keyword(s):  
Conceptual Model ◽  
Firm Value ◽  
Market Value ◽  
The Impact ◽  
First Time

On September 18, 2017, the organizers of the 2018 Giro d’Italia announced that for the first time in its history, this world famous event would begin outside of Europe—in Israel. This article contributes to the literature by taking advantage of this unique opportunity of analysis; in particular, it tests the effect that this announcement had upon Israeli tourism companies’ market value. The results show that on the very same day the announcement was made, there was an increment in the firm value of these companies. We propose a conceptual model and argue that the hype generated helps enhance the country’s image, leading to higher expectations of incoming tourism. This article presents a contribution to the growing evidence regarding the impact of such announcements upon actual market value of tourism companies.

Passenger aircraft emissions analysis at Ordu-Giresun International Airport, Turkey in 2017

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ilkay Orhan
Keyword(s):  
Aircraft Engine ◽  
Civil Aviation ◽  
Exhaust Emission ◽  
Aircraft Emissions ◽  
Emission Data ◽  
Emission Analysis ◽  
Content Type ◽  
International Airport ◽  
Engine Emission ◽  
The Impact

Purpose The purpose of this study is to present the pollutant gas produced by hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NOx) and the quantity of fuel burned from commercial aircraft at Ordu-Giresun International Airport, Turkey during the landing and take-off (LTO) cycles in 2017. Design/methodology/approach The flight data recorded by the General Directorate of State Airports Authority and the aircraft engine emission data from International Civil Aviation Organization (ICAO) Engine Exhaust Emission Databank were used for calculation. The aircraft and engine types used by the airlines for flight at Ordu-Giresun International Airport were determined. To evaluate the effect of taxi time on emission amounts, analysis and evaluations were made by taking different taxi times into consideration. Findings As a result of the emission analysis, the amount of fuel consumed by the aircraft were calculated as 6,551.52 t/y, and the emission amounts for CO, HC and NOx were estimated as 66.81, 4.20 and 79.97 t/y, respectively. Practical implications This study is aimed to reveal the effect and contribution of taxi time on the emitted emission at the airport during the LTO phase of the aircraft. Originality/value This study helps aviation authorities explain the importance of developing procedures that ensure the delivery of aircraft to flights in minimum time by raising awareness of the impact of taxi time on emitted emissions, and contributes to the determination of an aircraft emission inventory at Ordu-Giresun International Airport.

scholarly journals The Impact of ‘Selfie’ Tourism on the Behaviour and Welfare of Brown-Throated Three-Toed Sloths

Animals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 216 ◽  
Author(s):  
Gemma Carder ◽  
Tinka Plese ◽  
Fernando Machado ◽  
Suzanne Paterson ◽  
Neil Matthews ◽  
...  
Keyword(s):  
Animal Welfare ◽  
Future Study ◽  
Average Duration ◽  
Wild Animal ◽  
Wild Animals ◽  
Different Types ◽  
Bradypus Variegatus ◽  
Focal Observation ◽  
The Impact ◽  
Physical Manipulation

The use of wild animals as photo props is prevalent across the globe and is widely recognised to represent a potential animal welfare concern. However, detailed information regarding the specific impacts of such activity on wild animal behaviour is currently lacking. Herein, we investigated how brown-throated three-toed sloths (Bradypus variegatus) were handled by tourists, and how sloths behaved during wildlife ‘selfies’ taken in Manaus, Brazil and Puerto Alegria and Iquitos in Peru. In total, we observed 17 sloths (during 70 focal observations) that were provided for use in wildlife selfies on 34 different tours. We found that an average number of 5 people held each sloth during each focal observation. For 48.6% of the time the sloths were handled in a way which involved physical manipulation of the sloths’ head and/or limbs and/or being held by the claws. From the eight different types of sloth behaviour observed, we found that the two types performed for the longest average duration of time were surveillance (55.3%) and limb stretching (12.6%). Our findings show that when being handled sloths were frequently held in ways that may compromise their welfare. Although to date the behaviour of sloths while being handled has not been reported in any published literature, in this study we document certain behaviours which may act as indicators of compromised welfare. We suggest that our data provides a potential baseline for future study into the behaviour and welfare of sloths.

scholarly journals Development of conceptual model of project value dynamics analysis in conditions of uncertainty

2021 ◽  
Vol 4 (13(112)) ◽  
pp. 101-112
Author(s):  
Olexander Bugrov ◽  
Olena Bugrova
Keyword(s):  
Conceptual Model ◽  
Cash Flow ◽  
Construction Projects ◽  
Dimensional Space ◽  
Value Engineering ◽  
Cost Ratio ◽  
Benefit Cost Ratio ◽  
Annual Total ◽  
Benefit Cost ◽  
The Impact

A conceptual model for analyzing the dynamics of the value of the project, achieved as a result of engineering, under conditions of uncertainty has been developed. In the methodological context, the proposed approach is based on an array of isovalues, each of which corresponds to its own level of optimism in forecasting the cash flow for the project. With the increase in the efficiency of the project due to engineering, the entire array of iso-value lines’ changes its geometrical position, moving further from the origin (in the four-dimensional space "time-benefit-cost-risk"). The proposed model includes three stages. At the first stage, input information is collected and the corresponding analysis is initiated. The result of the second stage is a multivariate cash flow forecast and calculation of the benefit-cost ratio (BCR) and its changes for each scenario. The third stage provides the calculation of the expected BCR and its change, an assessment of the risk of making an erroneous decision and changing this risk as a result of the engineering session. The model makes it possible to calculate the achieved proportion of the static and dynamic vectors of change in the value of the project, which is one of the key manifestations of the scientific novelty of the work. In the example considered, the share of the dynamic vector of growth in the value of the project was found to be 35.47 %. The model has an environmental property - the assessment of the success of value engineering under conditions of uncertainty is carried out on the basis of the annual total benefits and the annual total costs throughout the project cycle. Thus, the analysis takes into account the impact of the project on the environment, which is reflected in the risk assessment. The given case testifies to the feasibility of applying the model in the practice of engineering the value of construction projects.

scholarly journals Analysis of wind impact on emission of selected exhaust compounds in jet engines of a business jet aircraft in cruise phase

2018 ◽  
Vol 173 (2) ◽  
pp. 55-60
Author(s):  
Małgorzata PAWLAK ◽  
Andrzej MAJKA ◽  
Michał KUŹNIAR ◽  
Jowita PAWLUCZY
Keyword(s):  
Wind Speed ◽  
Fuel Consumption ◽  
Wind Direction ◽  
Adverse Impact ◽  
Air Transport ◽  
Jet Engines ◽  
Business Jet ◽  
Condi Tions ◽  
Harmful Substances ◽  
The Impact

Among the most important problems currently faced by air transport, we can distinguish the adverse impact of aircrafts on the natu-ral environment, as well as the rising costs of transport. One of the possibilities to improve this situation is better adjustment of aircraft characteristics to the performed transport tasks, taking into account all the requirements and limitations that exist in air traffic and the adverse impact of air transport on the natural environment. It is reflected in the research tasks conducted under the SESAR program. The aspiration to minimize the adverse impact of aircrafts on the environment is executed, among others, through determining such trajectories that are characterized by minimal fuel consumption or minimal emission of harmful substances in the engines exhausts. These goals are corresponding with the research conducted and described in the paper. The main aim of the work was to analyse the impact of wind speed and direction on the emission of harmful substances of a jet aircraft performing a flight on a given route. For research purposes, the route between two Polish cities Gdansk and Rzeszow was considered. The distance between the two airports was divided into sections for which wind direction and strength were determined (read from the windy.com website). Next, the aircraft per-formance was determined and the fuel consumption and the amount of harmful compounds (CO2, NOx, CO and HC), emitted in the en-gines exhausts were determined for the route from Gdansk to Rzeszow (under favourable wind conditions) and on the return route – from Rzeszow to Gdansk (under unfavourable wind conditions). For comparative purposes, emission of these substances for windless condi-tions was also determined. The results are presented in tables and depicted in the graph, as well as discussed in the conclusions of the paper.

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