Dynamic Quality Evaluation Research Articles

Recording thermal history of pork meat by self-coloration gel

For real-time dynamic quality evaluation of pork meat, the thermal accumulation monitoring for the entire period is essential. The research aims to develop a novel covalent organic framework (COF) gel capable of recording such information. The COF with self-responsive irreversible color change property was synthesized using benzene-1,3,5-tricarboxaldehyde, 2,5-diamino-1,4-benzenedithiol dihydrochloride and p-phthalaldehyde as monomers. The thermal accumulation was monitored based on the COF over a broad temperature range (−22 °C–55 °C), which covered the storage temperatures of the pork meat. The results were easily readable by series visible color variations (yellow, green, blue and dark blue) displayed by COF during the thermal accumulation monitoring in the temperature range (25 °C–55 °C) of study. At the lower temperature (−22 °C–4 °C), small variation of the thermal information can be effectively represented by quantitative analysis. The color change rates were in the order of k-22 °C < k4°C < k25 °C < k35 °C < k55 °C. The activation energy of reaction was 65.31 kJ mol−1. The indicator gel was prepared by the COF combining with carrageenan in pure aqueous medium. The potential application of the COF gel for real-time monitoring the dynamic quality change of pork samples was investigated. The response signals of the COF gel were well matched with the growth rate of microbe in pork meat. The proposed COF gel based thermal history indicator is promising for real-time monitoring dynamic quality changes of pork meat during the cold supply chain.

Time-sensitive markdown strategies for perishable products based on dynamic quality evaluation

Purpose This study aims to provide a time- and price-sensitive market strategy for merchants to handle the markdown price strategy. The market demand for perishable products is usually price – and quality (freshness) – sensitive. The proper handling of markdown-price strategies can help merchants enhance competitiveness and maximize operational performance. Design/methodology/approach A markdown strategy consisting of price and markdown time was developed to explore the properties of market strategies based on the dynamic quality evaluation. The strategy considers multiple price discounts and multiple markdown times. The optimal price decisions in each stage and the optimal markdown times were derived during the selling season. Findings The results showed the following. A retailer always raises the initial price if it wants to adopt multiple price-markdown strategies. A high initial price may lead to a high inventory at the early stage and bring the next price reduction in advance. Large price discounts can be used to reduce the inventory later. The higher the previous price, the shorter the interval between the next price reduction. The markdown strategies showed that the regular discount as a new business model is not the best pricing model for perishable products. A time- and price-sensitive strategy, however, can increase operational performance and provide new insights for perishable products. Originality/value The results showed the following. A retailer always raises the initial price if it wants to adopt multiple price-markdown strategies. A high initial price may lead to a high inventory at the early stage and bring the next price reduction in advance. Large price discounts can be used to reduce the inventory later. The higher the previous price, the shorter the interval between the next price reduction. The markdown strategies showed that the regular discount as a new business model is not the best pricing model for perishable products. A time- and price-sensitive strategy, however, can increase operational performance and provide new insights for perishable products.

In‐Process Quality Inspection of Rolling Element Bearings Based on the Measurement of Microelastic Deformation of Outer Ring

Quality inspection is the necessary procedure before bearings leaving manufacturing factories. A testing machine with low shaft speed and light radial load condition is generally used to test the dynamic quality of bearings, which avoids creating any potential damages to testing bearings. However, the signal of defective bearings is easily polluted by very weak noise using the traditional vibration‐based measurement method due to the low shaft speed and light radial load condition specified for nondestructive inspection, which needs complicated and time‐consuming calculation and is not suitable for online inspection. Thus, there are problems about special operating conditions and weak fault severity in quality inspection of bearings, which is quite different from the fault diagnosis of bearings. In this paper, a novel dynamic quality evaluation technique is proposed based on the measurement of Hertz deformations. The measurement system is mainly composed of an eddy current sensor, sensor fixture, and data acquisition platform with less transfer path than the vibration‐based measurement system. The sensor fixture is optimized through numerical simulations to obtain signals with a high signal‐to‐noise ratio. Accurate evaluation of dynamic quality can be implemented reliably with simple signal processing. The proposed method can be used with a rotating speed of 100 rev/min and test load of 100 N, which is remarkably lower than the traditional quality inspection machineries with a rotating speed of around 1000 rev/min and the test load of 400 N. Both simulation and experiment studies have verified the proposed method.

Dynamic Quality Evaluation in Higher Education

The paper aims to propose, investigate and test suitable means for automation of the processes for dynamic quality evaluation of objects in a given subject area. On the basis of the theoretical study a number of conceptual and computational models are proposed. In consequence, the architecture of a software system for dynamic quality evaluation is defined and a corresponding software prototype is built over an existing university information infrast-ructure. General models are applied for dynamic quality evaluation of different objects in the field of higher education.

Autonomous Components Whose Adaptation Policies Can Be Customized Online and Evaluated Dynamically

PDF HTML阅读 XML下载 导出引用 引用提醒 自主构件自适应策略的在线定制及动态评估 DOI: 10.3724/SP.J.1001.2012.04029 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金(61073020); 国家重点基础研究发展计划(973)(2009CB320703); 国家高技术研究发展计划(863)(2008AA01Z139) Autonomous Components Whose Adaptation Policies Can Be Customized Online and Evaluated Dynamically Author: Affiliation: Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:开放分布式环境下自适应软件的研究已引起学术界、工业界的广泛关注.但分布在网络上的软件实体是由不同的组织独立开发并部署的,它们代表各自的组织(或所有者)自主地采取行动,在构造分布式环境下的自适应系统时,不能再将构成单元视为被动的受管对象,而应将其建模为具有主动行为能力的计算实体,并在这一层面设计和封装系统的自适应逻辑.然而,在现阶段对于自主计算实体的研究中,大多缺乏对于自适应策略的动态加载和动态演化的支持.提出了一种支持策略动态加载的自主构件模型,使得自主构件能够在运行时习得新的自适应策略和行为,实现了一种基于质量运行时动态评估的自主构件的自适应机制,使得自主构件能够自行评估自适应策略的优劣并选择最佳的策略加以适应,在保证自身目标得以实现的同时,提高了服务质量.另外,还详细描述了自主构件的实现方案及其运行支撑,通过实验展示了自主构件基于质量动态评估的自适应过程以及自适应策略的动态加载过程. Abstract:Self-Adaptive software in open and distributed environments (especially the Internet) has been widely researched in academia and industry. However, software entities scattered on the Internet are independently developed and deployed by different organizations, and they autonomously take actions on behalf of their owners. They can no longer be considered passive and manageable. In the construction of self-adaptive software systems in open and distributed environments, constituent elements should be modeled and designed as autonomous computing entities, and the adaptive logic of systems should be encapsulated into constituent elements. Existing researches on autonomous computing entities are still insufficient in self-adaptive policies’ in online customization and dynamic evolution. Therefore, this paper proposes an autonomous component model, which supports self-adaptive policies’ in online customizing, by which components can gain new policies or behavior modes at runtime. Meanwhile, this paper implements a self-adaptive mechanism based on dynamic quality evaluation, by which components can evaluate the policies and select the best policy to improve their qualities of service at runtime. Finally, the paper provides some implementation details of the proposal and an experiment, which demonstrates the process of self-adaptation based on dynamic quality evaluation and the process of online policy customization. 参考文献 相似文献 引证文献