МЕТОДИКА ПРИНЯТИЯ РЕШЕНИЙ ПО РЕЗУЛЬТАТАМ АНАЛИЗА ПРОИЗВОДСТВЕННОЙ ДЕЯТЕЛЬНОСТИ АВИАКОМПАНИИ

The article deals with the mathematical solution of the decision-making problem on typical airline management. An original technique based on statistical hypothesis testing and the information field analysis, containing various information which influences decision-making is given. A criterion for evaluation of decisions effectiveness is introduced. It is concluded that the task of choosing the management decision is the task of verifying statistical hypotheses based on available authentic and unauthentic information items, i.e. partially reliable information.В статье рассматривается математическое решение задачи принятия решения по управлению типовой авиакомпанией. Предлагается оригинальная методика, основанная на проверки статистических гипотез и заключающаяся в анализе информационного поля, содержащего разнообразную информацию, влияющую на принятие решения. Вводится критерий оценки эффективности решений. Делается вывод, что задача выбора управленческого решения представляет собой задачу проверки статистических гипотез на основании имеющихся достоверных и недостоверных информационных элементов, т.е. в условиях частично достоверной информации

ПОДХОДЫ К ПОСТРОЕНИЮ СИСТЕМ УПРАВЛЕНИЯ Б ЕЗОПАСНОСТЬЮ ПОЛЕТОВ В АВИАКОМПАНИИ

The article presents three approaches of building a safety management system (SMS) in airlines in the framework of implementation of ICAO SARPs that apply methods of risk assessment based on use of operational activity of airline taking into account existing and implementing "protections" or "safety barriers".В статье приведены три подхода к построению системы управления безопасностью полетов (СУБП) в авиакомпании в рамках выполнения SARPs ИКАО, в которых применяются методы оценки риска, основанные на использовании данных эксплуатационной деятельности авиакомпании с учетом существующих и внедряемых «защит» или «барьеров безопасности»

THE PRIMARY INDICATORS OF AN AVERAGE RODUCTIVE ACTIVITY

The article deals with the primary productive indicators of an average airline activity that carries out passenger transportation to build up its system of quality. Four indicator groups are emphasized: the financial indicators, the indicators characterizing the quality of service to be provided, the indicators of air transportation quality, the indicators of personal operation quality. The algorithms to work out indicators are submitted

Approaches to construction of systems of safety management in airlines

The article presents three approaches of building a safety management system (SMS) in airlines in the framework of implementation of ICAO SARPs that apply methods of risk assessment based on use of operational activity of airline taking into account existing and implementing "protections" or "safety barriers"

DECISION-MAKING METHODS BASED ON THE ANALYSIS OF AIRLINEPERATION

The article deals with the mathematical solution of the decision-making problem on typical airline management. An original technique based on statistical hypothesis testing and the information field analysis, containing various information which influences decision-making is given. A criterion for evaluation of decisions effectiveness is introduced. It is concluded that the task of choosing the management decision is the task of verifying statistical hypotheses based on available authentic and unauthentic information items, i.e. partially reliable information

Research into Carbon Dioxide Curing’s Effects on the Properties of Reactive Powder Concrete with Assembly Unit of Sulphoaluminate Cement and Ordinary Portland Cement

Excessive emissions of carbon dioxide can lead to greenhouse effect thus destroying the ecological balance. Therefore, effective measures need to be taken to reduce the emission of carbon dioxide. In this study, the influence of carbon dioxide curing on the mechanical strength and NaCl freeze-thaw deterioration of reactive powder concrete (RPC) with the assembly unit of sulphoaluminate cement and ordinary Portland cement was investigated. The ratio of sulphoaluminate cement ranged from 0% to 100% by the total mass of cement with the curing age ranging from 1 d to 28 d. The mechanical strength of RPC with 50% ordinary Portland cement and 50% sulphoaluminate cement containing the polypropylene fibers ranging from 1% to 4% by volume of RPC were investigated. Moreover, the following mass and mechanical strength loss rates, the carbonation depth, the chloride ion migration coefficient and the relative dynamic elastic modulus (RDEM) during NaCl freeze-thaw cycles were determined. Finally, the scanning electron microscope (SEM) and X-ray diffraction were applied in investigating the carbonation process of RPC. Results showed that the addition of sulphoaluminate cement could improve the mechanical strength of RPC at low curing age (lower than 7 d). However, when the cuing age reached 7 d, the sulphoaluminate cement demonstrated negative effect on the mechanical strength. Moreover, the carbon dioxide curing led to increases in the mechanical strength and when ordinary Portland cement was added the enhancing effect was more obvious. Furthermore, the carbon dioxide curing could effectively improve the resistance of NaCl freeze-thaw cycles and increase the carbonation depth. Finally, the increasing dosages of polypropylene fibers were advantageous to the mechanical strength and the resistance of NaCl freeze-thaw cycles. From the researching results of the microscopic performance, the carbon dioxide curing could improve the compactness of hydration products and reduce the content of calcium hydroxide especially at the curing age of 3 days

Research on anti-shear performance of waterproof adhesive layer (WAL) in polyurethane-mixture steel-bridge pavement structure

Polyurethane-mixture pavement materials for steel bridges have excellent overall road performance and are expected to solve the durability and short service life problems of traditional asphalt-based steel-bridge pavement materials under harsh bridge usage environments. A waterproof adhesive layer (WAL) with good shear resistance is essential to fully exploit the outstanding performance of polyurethane pavement materials. However, research in this area is currently limited. This study applied polyurethane, which has good bonding performance with polyurethane pavement materials, as WAL. The impact of the coating amount of WAL, amount of crushed stone, and curing time on its shear performance were analyzed by conducting anti-shear strength tests and shear-fatigue tests. The results were then compared with those of epoxy resin WAL. The results indicate that the shear performance of polyurethane WAL is significantly better than that of epoxy resin WAL. At a crushed stone amount at 50%, coating amount of WAL in the range of 0.2–0.7k g/m2, and curing time of 60 min, the shear strength of the polyurethane WAL was 2.35–2.41 times that of epoxy resin, and the shear fatigue of polyurethane WAL was 1.14–1.28 times that of epoxy resin under the same conditions. The shear strength initially increases and then decreases with the increase in the WAL coating amount. However, the shear-fatigue life continues to increase with the increase in the WAL coating amount. The optimal coating amounts for polyurethane and epoxy resin WALs are 0.5 kg/m2 and 0.6 kg/m2, respectively. The anti-shear strength and shear-fatigue life decrease continuously with the increase in the amount of crushed stone. The addition of crushed stone reduces the anti-shear performance between the WAL and polyurethane-mixture pavement layer. Therefore, the recommended amount of crushed stone is 50%. During construction, a minimal amount should be applied while meeting the non-sticking requirement of construction-machinery rollers. The shear strength of the polyurethane-mixture pavement layer laid using both types of WALs in a dry-to-touch status is significantly higher than that laid using liquid or dry-hard WALs. The optimal curing times for the polyurethane and epoxy resin WALs are 60 min and 90 min, respectively

Moisture-Resilient Graphene-Dyed Wool Fabric for Strain Sensing

E-textile consisting of natural fabrics has become a promising material to construct wearable sensors due to its comfortability and breathability on the human body. However, the reported fabric-based e-textile materials, such as graphene-treated cotton, silk, and flax, generally suffer from the electrical and mechanical instability in long-term wearing. In particular, fabrics on the human body have to endure heat variation, moisture evaporation from metabolic activities, and even the immersion with body sweat. To face the above challenges, here we report a wool-knitted fabric sensor treated with graphene oxide (GO) dyeing followed by l-ascorbic acid (l-AA) reduction (rGO). This rGO-based strain sensor is highly stretchable, washable, and durable with rapid sensing response. It exhibits excellent linearity with more than 20% elongation and, most importantly, withstand moisture from 30 to 90% (or even immersed with water) and still maintains good electrical and mechanical properties. We further demonstrate that, by integrating this proposed material with the near-field communication (NFC) system, a batteryless, wireless wearable body movement sensor can be constructed. This material can find wide use in smart garment applications