Miracle-dz/UniFAR-FTUs huggingface dataset:
Graph Colouring with Input Restrictions

In this thesis, we research the computational complexity of the graph colouring problem and its variants including precolouring extension and list colouring for graph classes that can be characterised by forbidding one or more induced subgraphs. We investigate the structural properties of such graph classes and prove a number of new properties. We then consider to what extent these properties can be used for efficiently solving the three types of colouring problems on these graph classes. In some cases we obtain polynomial-time algorithms, whereas other cases turn out to be NP-complete. We determine the computational complexity of k-COLOURING, k-PRECOLOURING EXTENSION and LIST k-COLOURING on $P_k$-free graphs. In particular, we prove that k-COLOURING on $P_8$-free graphs is NP-complete, 4-PRECOLOURING EXTENSION $P_7$-free graphs is NP-complete, and LIST 4-COLOURING on $P_6$-free graphs is NP-complete. In addition, we show the existence of an integer r such that k-COLOURING is NP-complete for $P_r$-free graphs with girth 4. In contrast, we determine for any fixed girth $g\geq 4$ a lower bound $r(g)$ such that every $P_{r(g)}$-free graph with girth at least $g$ is 3-colourable. We also prove that 3-LIST COLOURING is NP-complete for complete graphs minus a matching. We present a polynomial-time algorithm for solving 4-PRECOLOURING EXTENSION on $(P_2+P_3)$-free graphs, a polynomial-time algorithm for solving LIST 3-Colouring on $(P_2+P_4)$-free graphs, and a polynomial-time algorithm for solving LIST 3-COLOURING on $sP_3$-free graphs. We prove that LIST k-COLOURING for $(K_{s,t},P_r)$-free graphs is also polynomial-time solvable. We obtain several new dichotomies by combining the above results with some known results.
Anti-corruption Campaigns and Pay-performance Sensitivity: Evidence from Chinese Listed Companies

ABSTRACT We explore whether anti-corruption campaigns affect pay-performance sensitivity (PPS) in Chinese listed companies. Using a detailed anti-corruption data set at the city level from 2012 to 2018, we find that anti-corruption campaigns lead CEOs to shield (justify) their compensation by increasing pay-performance sensitivity. This result passes a series of robustness tests and endogeneity concerns. Furthermore, channel tests show that anti-corruption campaigns increase pay-performance sensitivity via the deterrence effect and the contagion effect. Cross-sectional tests show that the positive relationship between anti-corruption campaigns and PPS is more pronounced in larger firms and firms that belong to oligopoly markets.
On the Universality of Microwave Envelope Equations for Narrowband Optoelectronic Oscillators

Narrowband optoelectronic oscillators are time-delayed system that can generate ultrapure microwave signals. In order to study these oscillators, one approach is to derive a time-delayed envelope equation. In this article, we show that this approach is universal and applies to a wide variety of OEO families. By studying different oscillators, it is possible to show that their dynamics is governed by an envelope equation that can be rewritten under a generalized universal form. In this article, this universal microwave envelope equation is proposed and investigated analytically for optoelectronic microwave oscillators, and the bifurcation analysis of the deterministic envelope equation is performed. The universal model is further generalized and written in a stochastic form in order to predict the phase noise performance of the oscillators.
PENGARUH TINGKAT MODAL KERJA TERHADAP HARGA SAHAM PADA PERUSAHAAN OTOMOTIF & KOMPONEN YANG TERDAFTAR DI BEI PERIODE 2014 – 2018

This study aims to determine the effect of the level of working capital on stock prices on automotive companies components listed on the Indonesia Stock Exchange. This type of research is explanatory research, namely research that explains the relationship between existing variables. The method used is multiple panel linear regression analysis with the help of eviews program 10. The population in this study were all automotive companies components listed on the Indonesia Stock Exchange in 2014-2018, amounting to 13 companies. The sample in this study were 4 companies. The results showed that based on the F test, cash turnover, accounts receivable turnover and inventory turnover had a probability value of 0,000 0.05 and obtained a Ftable value of 3.24 and a Fcount value of 12,80464 which meant that Fcount Ftable in a simultaneous cash turnover, receivable receivables and inventory turnover affects the stock price. Determination coefficient value (R2) of 0.7884, so it can be concluded that 78.8484% of the stock price is influenced by cash turnover, accounts receivable turnover and inventory turnover and the remaining 21.16% is influenced by other variables not examined in this study.
Multi-Label Medical Image Retrieval Via Learning Multi-Class Similarity

Introduction : Multi-label image retrieval is a challenging problem in the medical area. First, compared to natural images, labels in the medical domain exhibit higher class-imbalance and much nuanced variations. Second, pair-based sampling for positives and negatives during similarity optimization are ambiguous in the multi-label setting, as samples with the same set of labels are limited. Methods : To address the aforementioned challenges, we propose a proxy-based multi-class similarity ( PMS ) framework, which compares and contrasts samples by comparing their similarities with the discovered proxies. In this way, samples of different sets of label attributes can be utilized and compared indirectly, without the need for complicated sampling. PMS learns a class-wise feature decomposition and maintains a memory bank for positive features from each
SOME FIXED POINT THEOREMS RELATING TO THE ORBITAL CONTINUITY

In this paper, we prove a fixed point theorem for asymptotically regular mappings on a metric space using orbital continuity of the selfmap. As an application of this result, a fixed point theorem is established in $T$-orbitally complete metric spaces. Our results extend Mukherjee's theorem [4] to $T$-orbitally complete metric spaces, and generalize the theorems of Jotic [5] and Neu{s}i'{c} [6].
引言 (Introduction)

本期专辑收录的文章于2007年9月在青岛举行的题为“殖民主义与中国近代社会”的学术研讨会上初次面世。 这次国际研讨会由悉尼科技大学和青岛海洋大学共同举办，与会者来自澳大利亚、美国、英国、法国、德国、意大利、日本、新加坡、中国等众多国家，论文作者当中既有享誉世界的专家也有正在攻读博士的青年学者。 正如会议代表丰富多姿的不同背景，会议论文以“殖民主义与中国近代社会”为主题，从各种不同的角度，运用不同的方法探讨了中国自1840年鸦片战争到二十世纪后期香港澳门回归长达一个多世纪里与西方列强的遭遇。
The perinatal factors that influence the excretion of fecal calprotectin in premature-born children

Abstract This study aimed to provide additional information on the influence of perinatal factors on fecal (f)-calprotectin values in preterm infants. Calprotectin was determined from the first spontaneous stool (analyzed on the Alegria device by using the enzyme-linked immunosorbent assay [ELISA] method) obtained from neonates at a mean age of 3.41 ± 2.44 days of life. We analyzed 114 subjects who had a body weight of 1847.67 ± 418.6 g and were born at a gestational age of 32.6 ± 2.43 weeks, without intestinal and other congenital anomalies or any diseases other than those related to premature birth. The values of f-calprotectin are in a positive correlation with female subjects, intrauterine growth restriction, significant ductus arteriosus, enteral feeding intolerance, postnatal prolonged use of broad-spectrum antibiotics, and values of bicarbonates (analyzed in a sample of capillary arterial blood). Measurement of f-calprotectin in the first 7 days after birth can help to early detect the intestinal distress or early staging of necrotizing enterocolitis in premature infants.
Lithotripsy for calcified pelvic arteries prior to transfemoral aortic valve implantation

Úvod I když transfemorální přístup představuje zlatý standard při transkatetrové náhradě aortální chlopně (TAVI), až 10 % nemocných vyžaduje alternativní vstup vzhledem k významnému postižení pánevních tepen, které výkon tímto přístupem znemožňuje (1, 2, 3, 4). Zatímco některé alternativní přístupy jsou technicky relativně jednoduché, jiné jsou technicky náročnější a vyžadují částečný kardiochirurgický přístup (transaortální či transapikální cesta) (5). Zcela recentně byly publikovány práce popisující použití litotripse stenotických pánevních tepen k usnadnění tranfemorálního přístupu (6). Na pracovišti Kardiocentra, Krajské zdravotní, a. s. , Masarykovy nemocnice v Ústí nad Labem, o. z. , jsme poprvé provedli litotripsi pánevních tepen před TAVI u polymorbidního nemocného s oboustranným difuzním postižením pánevního řečiště s využitím Shockwave Lithotripsy system (Shockwave
Active Voltage Control for DFIG-Based Wind Farm Integrated Power System by Coordinating Active and Reactive Powers Under Wind Speed Variations

Large-scale wind farms are generally integrated by long-distance transmissions, but power grids cannot sufficiently support the access point voltage of these wind farms. The access point voltage undergoes a stability problem under wind speed variations. However, the reactive power compensation device cannot reconcile the requirements of response speed and compensation capacity. Despite their fast power decoupling control, the reactive power capability of doubly fed induction generators is restricted by active power output. To satisfy the reactive power demand of system under wind speed variations, coordinating the reactive power capability and active power output of wind farm is the key solution, based on which a novel active control idea is proposed. The reactive power capability of wind farm and the reactive power demand of system are both studied, and the controllable conditions of access point voltage are analyzed. Active voltage control strategies, including active adjustment of reactive power reference, active speed control, and active pitch angle intervention according to wind speed ranges, are proposed. In the simulation, the method is verified to adequately consider the reactive power demand, and excavate the wind farm reactive power capability. The method also effectively suppresses the change of grid voltage under wind speed variations.
Numerical Investigation of the Impacts of Borehole Breakouts on Breakdown Pressure

Borehole breakouts appear in drilling and production operations when rock subjected to in situ stress experiences shear failure. However, if a borehole breakout occurs, the boundary of the borehole is no longer circular and the stress distribution around it is different. So, the interpretation of the hydraulic fracturing test results based on the Kirsch solution may not be valid. Therefore, it is important to investigate the factors that may affect the correct interpretation of the breakdown pressure in a hydraulic fracturing test for a borehole that had breakouts. In this paper, two steps are taken to implement this investigation. First, sets of finite element modeling provide sets of data on borehole breakout measures. Second, for a given measure of borehole breakouts, according to the linear relation between the mud pressure and the stress on the borehole wall, the breakdown pressure considering the borehole breakouts is acquired by applying different mud pressure in the model. Results show the difference between the breakdown pressure of a circular borehole and that of borehole that had breakouts could be as large as 82% in some situations.
Spatial Analysis of the Occurrence and Spread of Wildfires in Southwest Madagascar

The island of Madagascar, located in the southern hemisphere between the equator and the Tropic of Capricorn in the Indian Ocean, 450 km from the African continent, is particularly affected by wildfires. The vegetation of the phytogeographic Western Domain of the island consists largely of savannas, wooded grassland, and secondary grassland, maintained by the repeated action of fire operating each year on a seasonal cycle. Rural populations employ fire to manage land use. Depending on the burning practice and the environment in which the fires happen, the impacts vary. This paper supplement the studies that have so far located and quantified wildfires by taking into account their different behaviors, particularly their spread. We analyzed the modalities of the relationship between the two fire products, active fire and burned area, derived from Moderate Resolution Imaging Spectroradiometer (MODIS) data to establish a typology based on fire spread patterns. We identified three general patterns of fire behaviors, as well as their locations in the studied area. Spatial analysis of this patterns enabled us to understand spatial logics better. Type 1 fires are the least frequently observed and have many active fires, but little or no burned area. Type 2 fires are the most common and have areas that burn like a mosaic. Type 3 fires are observed slightly less frequently than the previous type and have few active fires and large burned areas. An inter-annual analysis reveals the spatial stability or variability of these fire types.
Public-Private Partnership Supported Health Facilities and Progress towards Attainment of Universal Health Coverage in Kilimanjaro, Tanzania

BackgroundPublic-Private-Partnership-supported health facilities have been operational in Tanzania, and specifically, in Kilimanjaro since 1990s. This study provides a snapshot of the contribution of PPP-supported health facilities’ operations towards attainment of Universal Health Coverage (UHC) in Kilimanjaro region.MethodsAdopting a cross-sectional research design, samples of 384 households and 30 health facilities were selected through a multi-stage and purposive sampling approaches, respectively. Questionnaires and key informant interviews (KIIs) were administered (June 2020 - February 2021). Using IBM-SPSS v.23, chi-square was used to compare PPP-supported and government health facilities’ service delivery quality and affordability. Content analysis was done on KIIs.ResultsWith PPP-support unweighted mean index score for service availability (SA) was 46.59% and 29.14% without PPP-supported health facilities. With PPP-support, the GSR index score was 87% while it was 82% without PPP-support. This implies, with PPP-support, progress towards UHC attainment can be accelerated. There was no significant association between accessing services in PPP-supported or government health facilities by perceived service delivery quality and service affordability.ConclusionPPP-supported and government health facilities co-existence is essential at hastening the progress towards UHC in the study area. The government should strengthen policies and regulations to promote more PPPs in improving health facilities’ operations.Rwanda J Med Health Sci 2022;5(2):216-232
Renin‐Angiotensin and Endothelin Systems in Patients Post‐Takotsubo Cardiomyopathy

Background We investigate if renin‐angiotensin and endothelin‐1 response pathways follow the same pattern of recovery as left ventricular ejection fraction in patients with takotsubo cardiomyopathy. Methods and Results Ninety patients with takotsubo cardiomyopathy (n=30 in each of “acute,” “convalescent” [3–5 months] and “recovered” [>1 year] groups) who were on minimal or no medication and were free of any significant cardiac/metabolic comorbidities, and 30 controls were studied. Serum concentrations of renin, angiotensin‐converting enzyme, angiotensin II, big endothelin‐1, endothelin‐1 were measured using commercially available ELISA, and B‐type natriuretic peptide was measured using an immunoassay. Mean left ventricular ejection fraction was <40% during the acute phase in all groups, but recovered to 63% in convalescent and 64% in the recovered groups, respectively. Serum renin concentrations remain persistently elevated after a episode of takotsubo cardiomyopathy (P=0.03 versus controls). Angiotensin converting enzyme levels are significantly depressed during the acute phase compared with convalescent (P=0.004), recovered takotsubo cardiomyopathy (P=0.02) or controls (P=0.03). Angiotensin II is increased in patients with takotsubo cardiomyopathy (P<0.001 versus controls) remaining persistently elevated in the chronically recovered group alone (P=0.03 versus controls). Big endothelin‐1 levels are unchanged, but endothelin‐1 is significantly lower after takotsubo cardiomyopathy compared with controls (P=0.03). Conclusions Despite “normalization” of the left ventricular ejection fraction, there is long‐term maladaptive activation of renin‐angiotensin system in patients with takotsubo cardiomyopathy. Registration URL: https://www.clinicaltrials. gov; Unique identifiers: NCT02897739, NCT02989454.
Pathogenesis of Atherosclerosis: Review

In atherosclerosis, apolipoprotein B-lipoproteins in blood artery matrix attract monocytes, which become macrophages and dendritic cells. Macrophages generated from recruited monocytes cause a maladaptive, non-resolving inflammatory response that increases subendothelial layer. Some lesions cause myocardial infarction, stroke, and sudden cardiac death. Modern atherosclerosis research focuses on the molecular biology of atherogenesis, although the disease's complex pathophysiology is still unknown. The goal of this research is to examine the mechanisms of atherosclerosis development, such as endothelial dysfunction, fatty streak formation, fibrous plaque formation, and plaque rupture (Fig. 1.). This article takes a thorough look at the pathophysiology of atherosclerosis, addressing the pathological and biochemical mechanisms of atherosclerotic plaque development and growth. Atherosclerosis pathogenesis and disease development are the primary topics of discussion in this review, which focuses on the disease's particular targets.
Microstrip dual‐band bandpass filters using parallel‐connected open‐loop ring resonators

This article proposes a microstrip dual‐band bandpass filter that uses parallel‐connected open‐loop ring resonators. Compared to many microstrip dual‐band filters, the advantages of using microstrip open‐loop ring resonators are easy calculation (half‐guided‐wavelength), easy fabrication (equal width for all 50‐Ω lines and without grounding holes), and direct connection to external feed lines (reducing insertion loss caused by gap couplings). Another advantage of the filter is an asymmetrical feed on the ring resonator that provides sharp rejections at its adjacent bands. The input and output matches of resonators to the external feed lines are derived using a simple transmission‐line theory. The results of the derivation provide a simple design rule for filter designers. Simulated and measured results are presented with good agreement. The filter has minimum insertion loss of 1.25 dB at 1.85 GHz and 1.6 dB at 2.33 GHz. The 3‐dB fractional bandwidths are 5.9% for the 1.9‐GHz bandpass filter and 4.7% for the 2.4‐GHz bandpass filter, respectively. © 2008 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2008.
Complex radial basis function networks trained by QR-decomposition recursive least square algorithms applied in behavioral modeling of nonlinear power amplifiers

In this article, we propose a novel complex radial basis function network approach for dynamic behavioral modeling of nonlinear power amplifier with memory in 3 G systems. The proposed approach utilizes the complex QR-decomposition based recursive least squares (QRD-RLS) algorithm, which is implemented using the complex Givens rotations, to update the weighting matrix of the complex radial basis function (RBF) network. Comparisons with standard least squares algorithms, in batch and recursive process, the QRD-RLS algorithm has the characteristics of good numerical robustness and regular structure, and can significantly improve the complex RBF network modeling accuracy. In this approach, only the signal's complex envelope is used for the model training and validation. The model has been validated using ADS simulated and real measured data. Finally, parallel implementation of the resulting method is briefly discussed. © 2009 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2009.
Artificial intelligence methods for applied superconductivity: material, design, manufacturing, testing, operation, and condition monitoring

More than a century after the discovery of superconductors (SCs), numerous studies have been accomplished to take advantage of SCs in physics, power engineering, quantum computing, electronics, communications, aviation, healthcare, and defence-related applications. However, there are still challenges that hinder the full-scale commercialization of SCs, such as the high cost of superconducting wires/tapes, technical issues related to AC losses, the structure of superconducting devices, the complexity and high cost of the cooling systems, the critical temperature, and manufacturing-related issues. In the current century, massive advancements have been achieved in artificial intelligence (AI) techniques by offering disruptive solutions to handle engineering problems. Consequently, AI techniques can be implemented to tackle those challenges facing superconductivity and act as a shortcut towards the full commercialization of SCs and their applications. AI approaches are capable of providing fast, efficient, and accurate solutions for technical, manufacturing, and economic problems with a high level of complexity and nonlinearity in the field of superconductivity. In this paper, the concept of AI and the widely used algorithms are first given. Then a critical topical review is presented for those conducted studies that used AI methods for improvement, design, condition monitoring, fault detection and location of superconducting apparatuses in large-scale power applications, as well as the prediction of critical temperature and the structure of new SCs, and any other related applications. This topical review is presented in three main categories: AI for large-scale superconducting applications, AI for superconducting materials, and AI for the physics of SCs. In addition, the challenges of applying AI techniques to the superconductivity and its applications are given. Finally, future trends on how to integrate AI techniques with superconductivity towards commercialization are discussed.
Comparison of Production and Fluorescence Characteristics of Phycoerythrin from Three Strains of Porphyridium

Phycoerythrin, a special photosynthetic pigment, is widely used as fluorescent dye and has lots of underlying beneficial effects on health. A marine red microalga Porphyridium is considered as the potential feedstock for phycoerythrin production. However, the phycoerythrin-related properties of Porphyridium have not been systematically evaluated, especially between the species of P. cruentum and P. purpureum. The present study aimed to evaluate the production and fluorescence characteristics of phycoerythrin of three strains of Porphyridium. The results showed that P. purpureum SCS-02 presented the highest biomass, phycoerythrin content and yield were 6.43 g L−1, 9.18% DW and 0.288 g L−1, respectively. There was no significant difference between P. purpureum and P. cruentum in α and β subunits amino acid sequences of phycoerythrin and in fluorescence characteristics. The high gene expression level of the key enzymes in phycoerythrobilin synthesis (porphobilinogen synthase and oxygen-dependent coproporphyrinogen-III oxidase) could be related to the high phycoerythrin content of Porphyridium. Based on systematic evaluation, P. purpureum SCS-02 was selected due to its high biomass and phycoerythrin yield. P. purpureum and P. cruentum were highly similar in the phylogenetic tree, as well as in fluorescence characteristics; therefore, it was speculated that they might be the same Porphyridium species.