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Flight safety is an extremely important area of research. Hard landing, as one of seriously dangerous events during the flight landing phase, is an important issue to be taken into consideration in terms of flight safety, but has not been fully researched and the advance warning about it is almost blank despite there have been some researches on the landing safety problems. The prediction model of...
Nowadays, equipment development requires the collaboration of firms which constitute an equipment development chain. There are lots of risks that influence the product quality in an equipment development chain. Meanwhile, the multiple risk factors have complex influence on each other, and present a conduction characteristic between development chain nodes along an equipment development chain, which...
The paper investigates the Relative Advancement Degree of Difficulty (RAD2) problem to evaluate the feasibility and effectivity of the technology. Firstly, the study reviews concept of Technology Readiness Level (TRL), Earned Value Management (EVM). Then, an improved method was developed by integrating the impact on cost, schedule and technical performance to calculate the RAD2. With the result of...
Risk evaluation of equipment development, it's the key point to make sure the success of the whole equipment development. Firstly, the paper respectively provided methods of how to transform three typical forms of uncertainty risk information into triangular fuzzy number. Then, the paper established risk assessment models based on triangular fuzzy number and TOPSIS. Finally, the paper tested the above...
Copper selenide (Cu 2−x Se) thin films were potentiostatically deposited on molybdenum substrate with an aqueous solution of CuSO 4 and H 2 SeO 3 . The effect of the deposition potential on the microstructure and electrical properties of the thin films were studied using FESEM, HRTEM, and two probe conducting measurements. The morphologies of the films changed from...
Most literatures in design of (Q, r) inventory model assume that the expectation and standard deviation of demand are known. These descriptive statistics are derived by point estimation from historical data. While these point estimates used in the design may not represent the true demand status and sometimes may be far from true values. This inaccuracy of point estimation will lead to severe cost...
A technical framework which is based on Variation Mode and Effect Analysis (VMEA) and Theory of Inventive Problem Solving (TRIZ) for analyzing the variations or couplings exist in process scheme is presented firstly. Through the usage of VMEA method, an approach is proposed to detect the latent variations and couplings of process system, with the aim of reducing the variations of process system and...
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