A simplification of a real‐time verification problem

We revisit the problem of real‐time verification with dense‐time dynamics using timeout and calendar‐based models and simplify this to a finite state verification problem. We introduce a specification formalism for these models and capture their behaviour in terms of semantics of timed transition systems. We discuss a technique, which reduces the problem of verification of qualitative temporal properties on infinite state space of a large fragment of these timeout and calender‐based transition systems into that on clock‐less finite state models through a two‐step process comprising of digitization and finitary reduction. This technique enables us to verify safety invariants for real‐time systems using finite state model checking avoiding the complexity of infinite state (bounded) model checking and scale up models without applying techniques from induction‐based proof methodology. In the same manner, we verify timeliness properties. Moreover, we can verify liveness for real‐time systems, which are not possible by using induction with infinite state model checkers. Copyright © 2016 John Wiley & Sons, Ltd.     

On-line life history calendar and sensitive topics: A pilot study

The use of the life history calendar (LHC) or the event history calendar as tools for collecting retrospective data has received increasing attention in many fields of social science and medicine. However, little research has examined the use of this method with web-based surveys. In this study, we adapted this method to an on-line setting to collect information about young adults' life histories, sexual behaviors, and substance use. We hypothesized that the LHC method would help respondents to date sensitive and non-sensitive events more precisely than when using a conventional questionnaire. We conducted an experimental design study comparing university students' responses to an on-line LHC and a conventional on-line question list. A test-retest design in which the respondents completed the survey again two weeks later was also applied to test the precision and reliability of the participants' dating of events. The results showed that whereas the numbers of sensitive and non-sensitive events were generally similar for the two on-line questionnaires, the responses obtained with the LHC were more consistent across the two administrations. Analyses of the respondents' on-line behavior while completing the LHC confirmed that respondents used the LHC's graphic interface to correct and reedit previous answers, thus decreasing data errors.     

着色剂在PVC压延膜中的应用

概述了聚氯乙烯压延膜的特点和优点;针对PVC压延工艺的特殊要求,总结了PVC压延膜对颜料的特殊要求;介绍了PVC压延膜中常用的无机和有机颜料及使用注意事项。     

韶钢烧结厂的技术改造

介绍韶钢烧结厂近年来的技术改造内容，包括上料系统、烧结机主机及抽风系统的改造．通过这些改造使韶钢烧结厂的利用系数和设备日历作业率稳步提高，从而为炼铁的降成本、增效益作出了贡献，并对目前韶钢烧结厂存在的问题及今后的发展提出了设想     

Effect of weight,height and BMI on injury outcome in side impact crashes without airbag deployment

A comprehensive analysis is performed to evaluate the effect of weight, height and body mass index (BMI) of occupants on side impact injuries at different body regions. The accident dataset for this study is based on the National Automotive Sampling System-Crashworthiness Data System (NASS-CDS) for accident year 2000–08. The mean BMI values for driver and front passenger are estimated from all types of crashes using NASS database, which clearly indicates that mean BMI has been increasing over the years in the USA. To study the effect of BMI in side impact injuries, BMI was split into three groups namely (1) thin (BMI < 21), (2) normal (BMI 24–27), (3) obese (BMI > 30). For more clear identification of the effect of BMI in side impact injuries, a minimum gap of three BMI is set in between each adjacent BMI groups. Car model years from MY1995–1999 to MY2000–2008 are chosen in order to identify the degree of influence of older and newer generation of cars in side impact injuries. Impact locations particularly side-front (F), side-center (P) and side-distributed (Y) are chosen for this analysis. Direction of force (DOF) considered for both near side and far side occupants are 8 o’clock, 9 o’clock, 10 o’clock and 2 o’clock, 3 o’clock and 4 o’clock respectively. Age <60 years is also one of the constraints imposed on data selection to minimize the effect of bone strength on the occurrence of occupant injuries. AIS2+ and AIS3+ injury risk in all body regions have been plotted for the selected three BMI groups of occupant, delta-V 0–60 kmph, two sets (old and new) of car model years. The analysis is carried with three approaches: (a) injury risk percentage based on simple graphical method with respect to a single variable, (b) injury distribution method where the injuries are marked on the respective anatomical locations and (c) logistic regression, a statistical method, considers all the related variables together. Lower extremity injury risk appears to be high for thin BMI group. It is found that BMI does not have much influence on head injuries but it is influenced more by the height of the occupant. Results of logistic analysis suggest that BMI, height and weight may have significant contribution towards side impact injuries across different body regions.     

Seasonality in Estonian Traditional Landscape: The Example of Large Village Swings

Like every nation, Estonians have their own indigenous customs and habits. Village swings and the place of these swings in the landscape are focused upon as an example of such Estonian customs, and changes in landscape as related to seasonality and liminality are discussed. The word ‘swing’ is used to denote a large construction (traditionally made of wood) that is able to carry and swing at least two people. Village swings (for public use) are usually located in the middle of a village and the site is commonly used by young people as a place to meet and have a good time. Swinging takes place mostly in the spring and summer, forming one of the many seasonal activities that make up the Estonian traditional calendar. The seasonal break in swinging activity contributes to the eagerness with which swinging is resumed when spring returns, so seasonality creates frames, with the most valued time being the spring. With swinging, the spring has been celebrated as a very valuable and long-awaited season. Although the religious background for swinging has been forgotten, the place is still special and is visited mostly on certain festive occasions. As there is no comparable alternative to swing sites as a socializing place in the village, they have persisted through the centuries. The importance of preserving such unique seasonal places in Estonia's social landscape is demonstrated.     

军用飞机日历寿命预测技术研究现状及关键技术问题

结合国内外飞机服役寿命问题研究的现状,给出了一种飞机结构日历寿命的区域定寿方法和确定飞机日历寿命的原则、技术指标,指出了服役寿命研究中应重点解决的几个问题．     

LY12CZ铝合金腐蚀疲劳研究进展

综述了LY12CZ铝合金腐蚀疲劳机制及影响疲劳裂纹扩展的因素,探讨了采用加速腐蚀当量折算谱模拟日历腐蚀环境对飞机结构主体材料LY12CZ先做加速腐蚀再进行疲劳试验的方法;并介绍了该方法在计算飞机日历寿命上的最新研究进展和未来的发展方向.      

Mining fuzzy periodic association rules

We develop techniques for discovering patterns with periodicity in this work. Patterns with periodicity are those that occur at regular time intervals, and therefore there are two aspects to the problem: finding the pattern, and determining the periodicity. The difficulty of the task lies in the problem of discovering these regular time intervals, i.e., the periodicity. Periodicities in the database are usually not very precise and have disturbances, and might occur at time intervals in multiple time granularities. To overcome these difficulties and to be able to discover the patterns with fuzzy periodicity, we propose the fuzzy periodic calendar which defines fuzzy periodicities. Furthermore, we develop algorithms for mining fuzzy periodicities and the fuzzy periodic association rules within them. Experimental results have shown that our method is effective in discovering fuzzy periodic association rules.     

MH-Ni动力电池日历寿命预测方法

研究了一种氢镍（MH—Ni）动力电池日历寿命的预测方法。通过本方法,可以快速测试出本公司生产的氢镍动力电池的日历寿命,同时也为以后评估新品种动力电池的日历寿命提供了一种有效的方法。