Search Results (3)

This study develops a fault detection device for the fiber Bragg grating (FBG) sensing system and a fault detection method to realize the rapid detection of the FBG sensing system on airplanes. According to the distribution of FBG sensors on airplanes, the FBG sensing system is built based on wavelength division multiplexing (WDM) and space division multiplexing (SDM) technologies. Furthermore, the hardware and software of the fault detection device and the relevant FBG demodulator are studied in detail. Additionally, in view of the similar features of the healthy FBG sensor in the same measuring point, a rapid fault diagnosis method based on a synthetical anomaly index is proposed. The features (light intensity I, signal length L, standard deviation of original sample $\sigma$ and energy value in time-domain P) of FBG sensors are extracted. The aggregation center value of the above feature values is obtained through the loop iteration method. Furthermore, the separation degrees of features are calculated and then form the synthetical anomaly index so as to make an effective diagnosis of the state of the FBG sensor. Finally, the designed fault detection instrument and proposed fault detection method are used to monitor the 25 FBG sensors on the airplane, the results indicated that three faulty and two abnormal FBG sensors on the airplane are identified, showing the effectiveness of the proposed fault detection method. Full article

The effective operation of national innovation systems can be a source of many opportunities, but it cannot be forgotten that innovation in itself may mean limiting but also generating various types of risks for the functioning of the local market. The main aim of the article is to present the concept and classification of national innovation systems in the world and to try to answer whether the type of NIS determines the level of innovation of the economies of the European Union countries. The following research thesis was formulated in the study: the type of National Innovation System determines a certain level of innovation in the economy of an European Union country, i.e., in countries belonging to a developed NIS, the level of innovation of the economy is higher than in countries belonging to developing systems. The results of the analysis confirm the research thesis. In the empirical part, the level of innovation in the European Union countries was assessed using the synthetic measure of development (SMD) by Z. Hellwig. Based on the obtained values of the synthetic measure of development (innovation), a ranking of the innovation of the economies of the EU countries was compiled and groups of countries with a similar degree of innovation in the economy were distinguished. The developed ranking of the European Union countries was compared with the NSI classification presented in the theoretical part of the article. The study covered 2010 and 2019. Full article

The article is divided into two parts. Its first part analyses the functions of environmental education and land sharing performed by national parks in Poland. The second part presents the transformations of both tourist and nature protection functions of 117 municipalities (gminas), territorially linked with 23 national parks in Poland. For this purpose, a statistical analysis was carried out, applying linear ordering methods—synthetic development measures (SDM) were used. Subsequently, a comparative analysis of municipalities in each of the defined areas was carried out, along with an assessment of the correlation between the level of the nature protection function and the tourist function development. The research covers the years 2001–2016. SDM of nature protection function and tourist function in the municipalities linked with national parks indicate stability of the nature protection function as well as dynamic changes in the tourist function. It allows rejecting the research hypothesis that national parks intend to block the tourist function of municipalities. The research findings indicate the need for cooperation between municipalities and national parks not only for the sake of nature protection, but also for the purpose of area economic activation. Full article