Wood flooring in combination with underfloor heating systems

The main objective of the article is to inform about the wood flooring in combination with underfloor water heating systems. Wood is a very sensitive material that responds to its surroundings. For this reason, it is necessary to select a suitable wood, meeting the criteria of suitability for laying as flooring in combination with underfloor heating systems. It is also important to comply with the conditions of storage of wooden flooring and its installation under acceptable climatic conditions at the construction site, together with the technical regulations for the installation of wooden flooring in combination with underfloor heating systems, during the whole life cycle of the wood flooring. This article defines the basic input premise for the implementation of wooden floors in combination with underfloor heating systems, regarding the relevant technical standards and technological procedures valid in the Czech Republic. At the same time, the article describes possible failures of wooden floors in case of non-compliance with the above conditions. In the conclusion, we propose measures based on the described installation process failures of the wooden flooring in combination with underfloor heating systems, and after its use.

QC-story as cost management support tool application and evaluation in a clothing industry

A good cost management is a business need, where the process failures are identified and corrected, seeking continuous improvement, since competitiveness and lower prices are the market demanding. Such good management reflects on process economies, whether economic or energy efforts, and results in benefits for the company and final consumer, who receives a less costly product. In order to achieve this process of continuous improvement in costing process, the QC-story method was used to identify and analyze problems in cost calculation. For analysis of the problems some Quality Tools were used, making possible to identify the causes of the problems with cost management. At the end of the analysis, an action plan was proposed using the 5W2H tool to achieve the desired improvements. The application of the QC-story method was justified by the fact that divergences in cost management are common in all collections, directly impacting the company's income generation.

Prevention of Machining-Related Failures

The first part of this article focuses on two major forms of machining-related failures, namely machining workpiece (in-process) failures and machined part (in-service) failures. The second part of the article discusses the effects of microstructure on machining failures and their preventive measures.

Analisis Penyebab Kerusakan Unit Pompa Pendingin AC dan Kompresor menggunakan Metode FMEA

PT. XYZ is a company engaged in the steel industry which produces steel slabs, steel billets, steel plates and steel wires. One of the equipment that often gets damaged is the air conditioning pump and compressor unit in the fluid center service. The results of the availability of the AC and compressor refrigeration pump units show that the availability value is still below the company standards set so that an analysis of the root causes of the problem is needed and finding the best solution to fix existing problems by applying the failure mode and effect analysis (FMEA) method. FMEA is a method that systematically and structurally can analyze and identify the consequences of system and process failures and reduce or analyze the chances of failure. The purpose of this study is to identify and analyze the level of damage and its causes by applying the FMEA method. Based on the Pareto diagram of the damage to the air conditioning pump and compressor engine unit, it was found that the highest frequency of damage was the power supply with a down time percentage of 32.4%. The results of FMEA analysis produce two components that have a very high RPN value which is categorized as potential severity, namely fuse as the first component with an RPN value of 378 and the second is a fuse holder with an RPN value of 252. These two components are the main priority for improvement in the pump engine unit air conditioners and compressors especially for the machine and human aspects.

ALGORITHM FOR CONSTRUCTING A REACHABILITY TREE FOR STOCHASTIC PETRI NETS

Описываются основные определения дерева достижимости сетей Петри. Также рассматриваются различные примеры стохастических сетей Петри, в которых после выставления начальных маркировок в первых позициях определяются значения во всех остальных позициях. Показаны примеры определения маркировок при помощи высчитывания вектора диагональной свертки. Для каждого примера стохастической сети Петри проводится анализ данной сети. Данный анализ необходим для различных распределительных систем и процессов, особенно на заключительном этапе. Основными методами анализа являются дерево достижимости и матричные уравнения. Рассматривается один из таких методов анализа сетей Петри. С использованием дерева достижимости можно проанализировать, выявить и исправить сбои в процессах, которые могут произойти при наличии тупиковых состояний и при неправильной последовательности срабатывания переходов. Исходя из рассмотренных примеров предлагается обобщенный алгоритм построения дерева достижимости для стохастических сетей Петри. Предложенный алгоритм построения дерева достижимости стохастических сетей Петри можно применять для всех сетей как с конечным, так и с бесконечным множеством достижимости. Данный алгоритм будет являться полезным инструментом при анализе стохастических сетей Петри The article describes the basic definitions of the reachability tree of Petri nets. It also considers various examples of stochastic Petri nets, in which, after setting the initial markings in the first positions, the values in all other positions are determined. The work shows examples of determining markings by calculating the vector of the diagonal convolution. Each example of a stochastic Petri net is analyzed. This analysis is necessary for various distribution systems and processes, especially in the final stage. The main analysis methods are reachability tree and matrix equations. I consider one of such methods for analyzing Petri nets. Using the reachability tree, you can analyze, identify, and correct process failures that can occur when there are deadlocks and when transitions are fired incorrectly. Based on the examples considered, I propose a generalized algorithm for constructing a reachability tree for stochastic Petri nets. The proposed algorithm for constructing the reachability tree of stochastic Petri nets can be applied to all nets with both finite and infinite reachability sets. This algorithm will be a useful tool for analyzing stochastic Petri nets

Implementation and outcome of an electronic tool for detection of paracetamol overdose in a tertiary care hospital

Background Paracetamol is a widely used analgesic and antipyretic drug in hospitals. The development and implementation of an electronic tool with algorithm-based alerts (e-agent) in a clinical information system could reduce the risk of overdose. Objective In this study, the performance of such an e-agent developed to detect paracetamol overdosing was analyzed. Setting Swiss tertiary care hospital. Method All patients ≥ 18 years old who had documented paracetamol administration in the used clinical information system during 2017 were retrospectively screened for an absolute and relative overdosing of paracetamol (> 4 g and > 60 mg/kg/24 h, respectively). This was compared with the patients for which the e-agent had, during the same period, prospectively made an alert for absolute or relative overdosing or for a dosing interval < 4 h (potentially leading to an absolute overdose). Main outcome measure E-agent performance defined as detection rate. Results of the 13,196 adult patients who received at least one dose of paracetamol, 2292 were exposed at least once to > 4 g/day (17.4%), 39 of these (0.3% of total) were given > 5 g paracetamol. None received more than 6 g. The e-agent detected 87.2% of cases with doses > 5 g. In most cases (87.9%), the cause of the absolute overdose was a switch from intravenous to oral paracetamol, resulting in an absolute overdose the day of the change. The maximal daily dose of 60 mg/kg was exceeded in 30.1% of patients weighing < 50 kg, as well as in 42.3% of patients weighing < 60 kg. The e-agent detected 73.4% and 75.5% of those cases. Multiple absolute overdoses were found in 204 patients. The e-agent detected 72.7% of those. 90 multiple overdoses occurred during the same hospital stay and 11 on consecutive days. Conclusion Paracetamol overdose is a common medication error in hospitalized patients, which may occur due to process failures such as wrong timing when changing administration route or when factors like comedication and low body weight are ignored. The e-agent detects cases of paracetamol overdose, and therefore, can help prevent this kind of medication error in the clinical setting.