cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Performance Analysis of Profile Based Paging for Addis Ababa UMTS Networks
Creators: name: Getachew, Challa
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2020

description: Paging is an important mobile network procedure that is performed to locate and connect mobile users when they receive calls/sessions. It is needed as users are mobile, and continuously updating their serving cells is not bandwidth efficient. In traditional broadcast paging, all cells of a network are grouped into clusters that are identified by Location Area Code (LAC). Users update their LAC and network look for a paged user by sending paging messages for all cells within the user's LAC. A decision on cluster size is an important factor that determines the paging overhead and connection delay. The larger cluster size, the smaller LAC update but the larger capacity for the paging message. To minimize the capacity required for paging messages while maintaining a larger cluster size, profile-based paging has been proposed and studied. Yet, such a paging approach has not been investigated and applied for Addis Ababa third-generation network. In this thesis work, we analyzed the performance of profile-based paging algorithm for Addis Ababa third-generation network based on call detail record data collected from the network management system and compared it with conventional one. The algorithms considered were static and dynamic profile based paging. We analyzed the paging algorithms for users with less, moderate and highly mobile. A user's mobility is modeled using a Markov model. Achieved results show that the profile-based algorithm considerably increases the efficiency of utilization with slight or no effect in the overall paging success rate.
Chemical constituents of essential oils from the leaves and stem barks of four Vietnamese species of Fissistigma (Annonaceae)
Creators: name: Thang, Tran D.
name: Luu, Hoang V.
name: Vo C. Dung
name: Nguyen N. Tuan
name: Nguyen H. Hung
name: Dai, Do N.
name: Isiaka A. Ogunwande
Publisher: name: Taylor & Francis
Year: 2014
Subjects: Uncategorised

description: Chemical profiles of essential oils from four Fissistigma species: Fissistigma bracteolatum Chatt., Fissistigma villosissimum Merr., Fissistigma latifolium (Dunal) Merr. and Fissistigma glaucescens (Hance) Merr. were analysed by gas chromatography–flame ionisation detector and gas chromatography–mass spectrometry. Fissistigma essential oils consist mainly of sesquiterpenes (48.7–83.8%), monoterpenes (3.2–30.9%) and fatty acids (0.5–33.4%). Data on the essential oil composition of F. villosissimum, F. latifolium and F. glaucescens are reported for the first time.
Synthetic topology and Floquet dynamic quantum phase transition in a periodically driven Raman lattice
Creators: name: Cai, De-Huan
name: Yi, Wei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Stimulated by the recent progress in engineering topological band structures in cold atomic gases, we study the dynamic topological phenomena for atoms loaded in a periodically driven optical lattice. When the frequency of the periodic modulation is low, the time-dependent Hamiltonian can be mapped to a two-dimensional topological insulator, with the discretized frequency components playing the role of an additional, synthetic dimension. In the high-frequency limit, we derive the effective Floquet Hamiltonian of the system, and reveal the occurrence of Floquet dynamic quantum phase transitions -- an emergent topological phenomenon in the micromotion of the Floquet dynamics. Addressing the relation between the topology of the effective Floquet Hamiltonian and the presence of dynamic topological phenomena, we demonstrate that the topologically non-trivial nature of the Floquet Hamiltonian is a sufficient but not necessary condition for the onset of the Floquet dynamic quantum phase transition. We further discuss the relation of the topology of the Floquet Hamiltonian with the existence of dynamic skyrmion structures in the emergent momentum-time manifold of the micromotion, as well as the fate of these dynamic topological phenomena when the modulation frequency decreases away from the high-frequency limit. Finally, making use of the rich level structures of $^{171}$Yb atoms, we show that the system under study can be implemented in a one-dimensional Raman lattice where states in the $^1S_0$ ground-state manifold are coupled by Raman beams with periodically modulated amplitudes.
Total synthesis of cytotoxic metabolite ( ± )-desmethyldiaportinol from Ampelomyces sp.
Creators: name: Qasim, Muhammad
name: Aamer Saeed
Publisher: name: Taylor & Francis
Year: 2014
Subjects: Uncategorized

description: A concise total synthesis of ( ± )-desmethyldiaportinol isolated from Ampelomyces sp. is described. Microwave-assisted cyclocondensation of 3,5-dimethoxyhomopthalic acid with 3,4-dibromobutanoyl chloride afforded the 3-(2,3-dibromopropyl)-6, 8-dimethoxyisocoumarin in 2–3 min as the pivotal step. The 3,4-dibromobutanoyl chloride was itself synthesised from 3-butenoic acid via bromination in carbon tetrachloride at room temperature to yield 3,4-dibromobutanoic acid followed by reaction with thionyl chloride. The replacement of bromo- by hydroxyl substituent was achieved under mild conditions involving the refluxing in a mixture of acetone and water to provide ( ± )-3-(2,3-dihydroxypropyl)-6,8-dimethoxyisocoumarin which on complete demethylation furnished the title natural product.
title: Versammlungsfreiheit in der Krise
Creators: name: Harker, Aidan
name: Deyda, Jonas
name: Söker, Katharina
name: Brandt, Laurens
Publisher: name: Fachinformationsdienst für internationale und interdisziplinäre Rechtsforschung
Year: 2020
Subjects: subject: 342

description: Verfassungsblog: On Matters Constitutional
Market Segmentation of Mobile Internet Customers Using Clustering Algorithms: The Case of Ethio Telecom
Creators: name: Bishaw, Yadessa
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2020

description: Telecom companies utilize data mining algorithms and tools to understand the behaviors of their customers. Cluster analysis is one of the techniques used to identify homogenous groups of customers from a heterogeneous group based on the customers' service usage records. Clustering algorithms aim to find natural groupings of subscribers and are widely applied for customer profiling and market segmentation. As telecom customers use services like cellular Internet, huge amount of data is generated in the form of call detail record (CDR) primarily for billing purpose. This data can also be a source of information for marketing and network management tasks. Previously, different algorithms have been studied and implemented by researchers to understand how, why, when and where people access mobile Internet using already available data from the telecom systems. In this thesis, two clustering algorithms namely K-means and Two-Step were implemented on real CDR and CRM datasets of a telecom company in Ethiopia to segment mobile Internet users. Behavioral segmentation was performed using aggregated data of sample number of customers based on derived features. Moreover, the insights obtained from each segment were analyzed before suggesting marketing strategies for personalized services and targeted campaigns. K-means was applied on CDR dataset and meaningful clusters showing characteristics of users were obtained and explained. Two-Step clustering was found to be more suitable for segmenting user groups and has a better silhouette score than K-means. The results of the analysis show the possibility of using data stored by mobile operators for market segmentation purposes. It was examined from this research that clustering algorithms like K-means and TwoStep are applicable to observe patterns among ethio telecom customers based on service usage and demographic information of subscribers from database systems .
Isolation and identification of flavonoids from Coreopsis lanceolata L. petals
Creators: name: Okada, Yoshiharu
name: Okita, Mari
name: Murai, Yoshihiro
name: Okano, Yuka
name: Nomura, Masato
Publisher: name: Taylor & Francis
Year: 2014
Subjects: Uncategorized

description: The methanol extract of Coreopsis lanceolata L. petals was acid-hydrolysed, and 7,3′,4′-trihydroxy-8-methoxyflavanone (1) and 6,3′,4′-trihydroxy-7-methoxyaurone (leptosidin) (2) were successfully isolated. The structure of compound 1 is designated to flavanone based on X-ray crystallographic analysis and NMR spectroscopic analysis. Compound 1 showed high-antioxidant effects based on diphenylpicrylhydrazyl radical scavenging assay (94.3% scavenging rate) and superoxide dismutase-like activity assay (23.9% inhibition rate).
BTS: An Accelerator for Bootstrappable Fully Homomorphic Encryption
Creators: name: Kim, Sangpyo
name: Kim, Jongmin
name: Kim, Michael Jaemin
name: Jung, Wonkyung
name: Rhu, Minsoo
name: Kim, John
name: Ahn, Jung Ho
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: Hardware Architecture (cs.AR)
subject: FOS: Computer and information sciences

description: Homomorphic encryption (HE) enables the secure offloading of computations to the cloud by providing computation on encrypted data (ciphertexts). HE is based on noisy encryption schemes in which noise accumulates as more computations are applied to the data. The limited number of operations applicable to the data prevents practical applications from exploiting HE. Bootstrapping enables an unlimited number of operations or fully HE (FHE) by refreshing the ciphertext. Unfortunately, bootstrapping requires a significant amount of additional computation and memory bandwidth as well. Prior works have proposed hardware accelerators for computation primitives of FHE. However, to the best of our knowledge, this is the first to propose a hardware FHE accelerator that supports bootstrapping as a first-class citizen. In particular, we propose BTS - Bootstrappable, Technologydriven, Secure accelerator architecture for FHE. We identify the challenges of supporting bootstrapping in the accelerator and analyze the off-chip memory bandwidth and computation required. In particular, given the limitations of modern memory technology, we identify the HE parameter sets that are efficient for FHE acceleration. Based on the insights gained from our analysis, we propose BTS, which effectively exploits the parallelism innate in HE operations by arranging a massive number of processing elements in a grid. We present the design and microarchitecture of BTS, including a network-on-chip design that exploits a deterministic communication pattern. BTS shows 5,556x and 1,306x improved execution time on ResNet-20 and logistic regression over a CPU, with a chip area of 373.6mm^2 and up to 163.2W of power.
description: 15 pages, 10 figures
A new neo-clerodane diterpene from Ajuga decumbens
Creators: name: Huawei Lv
name: Jianguang Luo
name: Lingyi Kong
Publisher: name: Taylor & Francis
Year: 2014
Subjects: Uncategorised

description: A new neo-clerodane diterpene, named ajugacumbin J (1), together with 13 known compounds (2–14) was isolated from Ajuga decumbens. The structure of ajugacumbin J (1) was elucidated by 1D and 2D NMR spectra and MS. Ajugacumbin J (1) and ajugacumbin D (5) exhibited inhibition of lipopolysaccharide-induced nitric oxide production in RAW 264.7 macrophages with an IC50 value of 46.2 and 35.9 μM, respectively.
Quark-nuclear hybrid equation of state for neutron stars under modern observational constraints
Creators: name: Contrera, G. A.
name: Blaschke, D.
name: Carlomagno, J. P.
name: Grunfeld, A. G.
name: Liebing, S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We study a family of equations of state for hybrid neutron star matter. The hybrid EOS are obtained by a Maxwell construction of the first-order phase transition between a hadronic phase described by the relativistic density-functional EOS of the "DD2" class with excluded volume effects and a deconfined quark matter phase modeled by an instantaneous nonlocal version of the Nambu-Jona-Lasinio model in SU(2)$_f$ with vector interactions and color superconductivity. The form factor in the nonlocal quark matter model is fitted to lattice QCD results in the Coulomb gauge. Owing to strong coupling in the vector meson and diquark channels, a coexistence phase of color superconductivity and chiral symmetry breaking occurs. Our results show an approximately constant behavior for the squared speed of sound with values of 0.4 - 0.6 in the density region relevant for neutron star interiors. To simultaneously fulfill the constraints from the Neutron Star Interior Composition Explorer radius measurement for PSR J0740+6620 and tidal deformability from GW170817 it is necessary to consider a $μ$-dependent bag pressure that mimics confinement.
description: 18 pages, 7 figures
title: Rejuvenating international law: An introduction to an emerging field of research
Creators: name: Dirik, Selin
name: Wattenberg, Lewis
name: Hettihewa, Julian
name: Schott, Felix
Publisher: name: Fachinformationsdienst für internationale und interdisziplinäre Rechtsforschung
Year: 2020
Subjects: subject: 341

description: Völkerrechtsblog
Isolation and identification of flavonoids from Coreopsis lanceolata L. petals
Creators: name: Okada, Yoshiharu
name: Okita, Mari
name: Murai, Yoshihiro
name: Okano, Yuka
name: Nomura, Masato
Publisher: name: Taylor & Francis
Year: 2014
Subjects: Uncategorised

description: The methanol extract of Coreopsis lanceolata L. petals was acid-hydrolysed, and 7,3′,4′-trihydroxy-8-methoxyflavanone (1) and 6,3′,4′-trihydroxy-7-methoxyaurone (leptosidin) (2) were successfully isolated. The structure of compound 1 is designated to flavanone based on X-ray crystallographic analysis and NMR spectroscopic analysis. Compound 1 showed high-antioxidant effects based on diphenylpicrylhydrazyl radical scavenging assay (94.3% scavenging rate) and superoxide dismutase-like activity assay (23.9% inhibition rate).
Root Cause Analysis of Mobile Site Outage Using Bayesian Network: the Case of ethio telecom
Creators: name: Mesfin, Geremew
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2018

description: In most cellular networks Trouble Shooting (TS) is a manual process, accomplished by Radio Access Network (RAN) experts. Their task is to resolve problems in the network that have been identified by other employees or by automated checking routines. During the TS procedure, several applications and databases have to be queried to analyze performance indicators, cell configuration and alarms of the cells. For example when an outage in mobile network investigated, a Trouble Ticketing (TT) reflects the problem status, which is the fault description. A TT system is deployed as a large database, which can be queried by the user, using criteria like time constraints or identifiers, such as site ID (site identity). After a query, all the cases related to the specified site within the given time period are shown. The entries are normally in "free text", almost like a "virtual log-book" that everyone uses to annotate the actions taken and observations made for the site. Hence, in difficult cases lots of people from various departments have looked into the site and potentially applied some changes. For example a case might involve changing parameters or swapping hardware. Thus, several notes are normally written to such a case. The availability of mobile services without interruption has many social and economic benefits. However, mobile network outages occur due to many different reasons. One of the reasons for Base Transceiver Station (BTS) site outage is failure of hardware elements of the most varied kinds: switching units, cables, cooling elements, energy elements, etc. The possible relations or interconnections between elements are not explicitly well-defined so study the root causes of network outage is important. In telecom network environment, there are different network problems of which their associated causes can be address through Artifitial Intelegent (AI), mostly detection, and forecasting. On the other hand incident management systems (also called Trouble Ticket (TT)) have hardly used AI techniques to optimize the processes involved. Thus this thesis work investigate the root causes of network outage using Bayesian network models, then analyzing the ethio telecom (ET) network outage TT data. The outcome for the analysis result are model based Root Causes Analysis of BTS mobile site network outage is performed, the network technicians can be informed of the real scope of failures and the probable existence of root problems, technicians can be advantages through managing the situations and good for decision making task by providing the root causes of alarms and their probabilities of occurrence.
D4.2: Safety interactions of nuclear power plant & hydrogen cogeneration
Creators: name: Ansaldo
name: ESG
name: GRS
name: NRG
name: Tecnatom
name: TUD
Publisher: name: Zenodo
Year: 2024
Subjects: nuclear
hydrogen
cogeneration

description: This document is focused on determining the issues that may arise from applying the different regulatory frameworks to an integrated NPP-HPP facility. Based on the outcome of task 4.1, the impact of the different levels of integration on the license, licensing process and license documentation for both facilities is determined. For this purpose, 5 subtasks were carried out:Subtask 1 (performed by Tecnatom) identifies and describes the available technologies to produce hydrogen using heat and electricity from an NPP. Their main characteristics are compared, and context information required for the licensing analysis is provided. The different interfaces between the NPP and the HPP are described for the different levels of integration.Subtask 2 (performed by ES Group) focuses on the description of necessary technical modifications of NPP systems for the integration of an HPP, depending on the integration scenarios. This is illustrated using the example of the NPP Rivne in Ukraine.Subtask 3 (performed by NRG) concerns a generic Safety Case Approach for the various integration scenarios, evaluating the safety impact of modifications to a nuclear installation or activity, followed by a specific safety case adressing the possible Rivne NPP-HPP integration scenarios.Subtask 4 (performed by TU Dresden) presents the main outcomes from the impact assessment applied to the integration of a 40 MW hydrogen facility into the Rivne power station in Ukraine. This includes a definition of the worst case scenarios, a frequency assessment for these scenarios and a consequence estimation for the identified scenarios. The consequence estimations are based on deterministic safety calculations by means of selected semi-empirical methods from the process safety.Subtask 5 (performed by GRS and Ansaldo) consists of the analysis of the impact of the NPP-HPP integration scenarios on the licensing process. Based on the outcomes of task 4.1, the requirements of the regulations applicable to the HPP and the NPP were considered and the approval procedures and safety analyses required for successful integration were assessed on a qualitative level. The impact of individual key aspects was evaluated and scored (high, medium, low) depending on the integration scenario, and the results were presented in tabular form.
Frozen dynamics of a breather induced by an adiabatic invariant
Creators: name: Politi, Antonio
name: Politi, Paolo
name: Iubini, Stefano
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: The Discrete Nonlinear Schrödinger (DNLS) equation is a Hamiltonian model displaying an extremely slow relaxation process when discrete breathers appear in the system. In [Iubini S, Chirondojan L, Oppo G L, Politi A and Politi P 2019 Physical Review Letters 122 084102], it was conjectured that the frozen dynamics of tall breathers is due to the existence of an adiabatic invariant (AI). Here, we prove the conjecture in the simplified context of a unidirectional DNLS equation, where the breather is "forced" by a background unaffected by the breather itself. We first clarify that the nonlinearity of the breather dynamics and the deterministic nature of the forcing term are both necessary ingredients for the existence of a frozen dynamics. We then derive perturbative expressions of the AI by implementing a canonical perturbation theory and via a more phenomenological approach based on the estimate of the energy flux. The resulting accurate identification of the AI allows revealing the presence and role of sudden jumps as the main breather destabilization mechanism, with an unexpected similarity with Lévy processes.
description: 23 pages. Abstract and Introduction fully rewritten, also other minor changes
Total synthesis of cytotoxic metabolite ( ± )-desmethyldiaportinol from Ampelomyces sp.
Creators: name: Qasim, Muhammad
name: Aamer Saeed
Publisher: name: Taylor & Francis
Year: 2014
Subjects: Uncategorised

description: A concise total synthesis of ( ± )-desmethyldiaportinol isolated from Ampelomyces sp. is described. Microwave-assisted cyclocondensation of 3,5-dimethoxyhomopthalic acid with 3,4-dibromobutanoyl chloride afforded the 3-(2,3-dibromopropyl)-6, 8-dimethoxyisocoumarin in 2–3 min as the pivotal step. The 3,4-dibromobutanoyl chloride was itself synthesised from 3-butenoic acid via bromination in carbon tetrachloride at room temperature to yield 3,4-dibromobutanoic acid followed by reaction with thionyl chloride. The replacement of bromo- by hydroxyl substituent was achieved under mild conditions involving the refluxing in a mixture of acetone and water to provide ( ± )-3-(2,3-dihydroxypropyl)-6,8-dimethoxyisocoumarin which on complete demethylation furnished the title natural product.
title: Lifetime measurements of the low-lying excited states of ²⁰⁸Po
Creators: name: Kocheva, D.
name: Yaneva, A.
name: Kalaydjieva, D.
name: Rainovski, G.
name: Jolie, J.
name: Pietralla, N.
name: Beckers, M.
name: Blazhev, A.
name: Bussmann, L.
name: Cappellazzo, M.
name: Dewald, A.
name: Diel, F.
name: Djongolov, M.
name: Dunkel, F.
name: Esmaylzadeh, A.
name: Falk, B.
name: Fransen, C.
name: Garbe, J.
name: Gerhard, L.
name: Gerst, R.-B.
name: Gladnishki, K. A.
name: Goldkuhle, A.
name: Hackenberg, G.
name: Henrich, C.
name: Homm, I.
name: Ide, K.
name: Karayonchev, V.
name: Kern, R.
name: Kleeman, J.
name: Knafla, L.
name: Kornwebel, L.
name: Kröll, Th.
name: Ley, M.
name: Müller-Gatermann, C.
name: Scheck, M.
name: Schmidt, T.
name: Spagnoletti, P.
name: Stoyanova, M.
name: Werner, V.
Publisher: name: IOP Publishing
Year: 2024

description: In this study we present the preliminary results about the lifetimes of the 2₂⁺, 4₁⁺ states of ²⁰⁸Po and the upper limit of the lifetime of the 2₁⁺ state. For measuring the lifetimes of the 2₁⁺ and 4₁⁺ states the Recoil Distance Doppler Shift (RDDS) method and for the lifetime of the 2₂⁺ state the Doppler Shift Attenuation method (DSAM) were used. The resulting absolute transition strength B(M1 ; 2₂⁺ → 2₁⁺) ≥ 0.122(20) μN² reveals the predominant isovector nature of the 2₂⁺ state of ²⁰⁸Po.
On neural network kernels and the storage capacity problem
Creators: name: Zavatone-Veth, Jacob A.
name: Pehlevan, Cengiz
Publisher: name: arXiv
Year: 2022
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: In this short note, we reify the connection between work on the storage capacity problem in wide two-layer treelike neural networks and the rapidly-growing body of literature on kernel limits of wide neural networks. Concretely, we observe that the "effective order parameter" studied in the statistical mechanics literature is exactly equivalent to the infinite-width Neural Network Gaussian Process Kernel. This correspondence connects the expressivity and trainability of wide two-layer neural networks.
description: 5 pages, no figures
Synthesis and Antimicrobial Activities of Some 6-Methyl-3-Thioxo-2,3-Dihydro-1,2,4-Triazine Derivatives
Creators: name: El-Barbary, Ahmed A.
name: El-Shehawy, Ashraf A.
name: Abdo, Nabiha I.
Publisher: name: Taylor & Francis
Year: 2014
Subjects: Uncategorized

description: 4-Arylidene-imidazole derivatives (4a,b) were readily prepared by reacting 4-am- ino-6-methyl-3–thioxo-2,3–dihydro[1,2,4]triazin-5(4H)-one (1) with 4-arylidene-2-phenyl- 4H-oxazol-5-one (2). Reaction of 1 with some aromatic aldehydes in presence of triethylphosphite exclusively afforded the corresponding aminophosphonates 5a-c. Reaction of 1 with 3-phenyl-1H-quinazoline-2,4-dione (6a) and/or 3-phenyl-2-thioxo-2,3-dihydro- 1H-quinazolin-4-one (6b) gave 2-(6-methyl-5-oxo-3-thioxo-2,5-dihydro-3H-[1,2,4]triazin-4-ylimino)-3-phenyl-2,3-dihydro-1H-quinazolin-4-one (7). Moreover, on treating 1 with 2-phenylbenzo[d][1,3]thiazine-4-thione (8), 6-methyl-4-(2-phenyl-4-thioxo-4H-quinazolin-3-yl)-3-thioxo-3,4-dihydro-2H-[1,2,4]triazine-5-one (9) was obtained in 65% yield. Reaction of 1 with 4-sulfonylaminoacetic acid derivatives (10a,b) afforded the corresponding sulfonamides (11a,b), respectively. Acid hydrolysis of 11a afforded 7-aminomethyl-3-methyl[1,3,4]thiadiazole[2,3-c][1,2,4]triazin-4-one (12). 4-Amino-6-methyl-3-(morpholine-4-ylsulfanyl)-4H-[1,2,4]triazin-5-one (14) was prepared by reacting compound 1 with morpholine in presence of KI/I2, while 3,3′-bis(4-amino-6-methyl-5-oxo-triazinyl)disulfide (16) was obtained by oxidation of 1 with lead tetraacetate. The antimicrobial activity of the products was evaluated against Gram-positive and Gram-negative bacteria as well as the fungus Candida albicans. [Supplementary materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements for the following free supplemental files: Additional text, figures, and tables.]
Image captioning algorithms for images taken by people with visual impairments
Creators: name: Zhang, Meng
name: 0000-0003-4505-6983
Publisher: name: The University of Texas at Austin
Year: 2019
Subjects: Image captioning
Computer vision
Deep learning
People with visual impairments

description: People with visual impairments regularly encounter the challenge that their visual impairments expose them to a time-consuming, or even impossible, task: what content is presented in an image without assistance. One method to address this problem is image captioning with machine learning. With the help of image captioning algorithms together with artificial intelligence speech system, people who are blind can instantly learn what is in an image, since such systems can automatically generate text captions. In this work, we analyze the new VizWiz dataset and compare it to the MSCOCO dataset, which is widely used for evaluating the performance of image captioning algorithms. We also implement and evaluate two state-of-the-art image caption models with accuracy, runtime, and resource analysis. Hopefully, our research will help the improvement of image captioning algorithms which focus on fulfilling the everyday needs of people with visual impairments
CLIP-Event: Connecting Text and Images with Event Structures
Creators: name: Li, Manling
name: Xu, Ruochen
name: Wang, Shuohang
name: Zhou, Luowei
name: Lin, Xudong
name: Zhu, Chenguang
name: Zeng, Michael
name: Ji, Heng
name: Chang, Shih-Fu
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Vision-language (V+L) pretraining models have achieved great success in supporting multimedia applications by understanding the alignments between images and text. While existing vision-language pretraining models primarily focus on understanding objects in images or entities in text, they often ignore the alignment at the level of events and their argument structures. In this work, we propose a contrastive learning framework to enforce vision-language pretraining models to comprehend events and associated argument (participant) roles. To achieve this, we take advantage of text information extraction technologies to obtain event structural knowledge, and utilize multiple prompt functions to contrast difficult negative descriptions by manipulating event structures. We also design an event graph alignment loss based on optimal transport to capture event argument structures. In addition, we collect a large event-rich dataset (106,875 images) for pretraining, which provides a more challenging image retrieval benchmark to assess the understanding of complicated lengthy sentences. Experiments show that our zero-shot CLIP-Event outperforms the state-of-the-art supervised model in argument extraction on Multimedia Event Extraction, achieving more than 5% absolute F-score gain in event extraction, as well as significant improvements on a variety of downstream tasks under zero-shot settings.
1-Methyl-3-(2-(Sulfooxy)Ethyl)-1H-Imidazol-3-Ium Thiocyanate as A Novel, Green, and Efficient BrØNsted Acidic Ionic Liquid-Promoted Regioselective Thiocyanation of Aromatic and Heteroaromatic Compounds at Room Temperature
Creators: name: Sajjadifar, Sami
name: Hosseinzadeh, Hossein
name: Ahmadaghaee, Saied
name: Eshagh Rezaee Nezhad
name: Saaid Karimian
Publisher: name: Taylor & Francis
Year: 2014
Subjects: Uncategorized

description: An efficient and simple method for the preparation of 1-methyl-3-(2-(sulfooxy)ethyl)-1H-imidazol-3-ium thiocyanate ([Msei]SCN)as a Brønsted acidic ionic liquid (BAIL) is described, and it is used in the highly efficient regioselective thiocyanation of aromatic and heteroaromatic compounds via a green and simple protocol. [Msei]SCN as a novel IL and thiocyanation agent, H2O2 as a mild and environmentally friendly oxidant, and H2O:ethanol(1:4) as a solvent were used. This procedure provided the target thiocyanates in high yield and very short reaction time. [Supplementary materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements for the following free supplemental files: Additional figures.]
Synthesis, Crystal Structure, and Biological Activity of A Novel 1,2,3-Thiadiazole Compound Containing 1,2,4-Triazole Moiety
Creators: name: Min, Li-Jing
name: Tan, Cheng-Xia
name: Weng, Jian-Quan
name: Liu, Xing-Hai
Publisher: name: Taylor & Francis
Year: 2014
Subjects: Uncategorized

description: A new 1,2,3-thiadiazole compound containing 1,2,4-triazole moiety, C15H14FN5 O2S2, has been synthesized and the crystal structure was determined by single crystal X-ray diffraction study. The biological activity of the title compound was determined and the results showed that title compounds 10 showed higher inhibition abilities of rape root than the control cyclopropane-1,1-dicarboxylic acid at 100 μg/mL (73%) and weak activity against Echinochloa crusgalli (28%) and KARI (35%) at 100 μg/mL. [Supplementary materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements for the following free supplemental files: additional text, figures, tables.]
title: Die Auflösung des „Flügels“ in der AfD: Gewinn für die freiheitlich-demokratische Grundordnung?
Creators: name: Thrun, Felix
Publisher: name: Fachinformationsdienst für internationale und interdisziplinäre Rechtsforschung
Year: 2020
Subjects: subject: 342

description: Verfassungsblog: On Matters Constitutional
Synthesis and Antimicrobial Evaluation of 1-{3-[(Furan-2-Ylmethyl)Sulfanyl] Propanoyl}-4-Substituted Thiosemicarbazides and their Products of Cyclization to 1,2,4-Triazole Ring
Creators: name: Trotsko, Nazar
name: Wujec, Monika
name: Kosikowska, Urszula
name: Malm, Anna
Publisher: name: Taylor & Francis
Year: 2014
Subjects: Uncategorized

description: By the reaction of 3-[(furan-2-ylmethyl)sulfanyl]propanoylhydrazide with various isothiocyanates, the corresponding 4-substituted 1-[(furan-2-ylmethyl)sulfanyl] propanoylthiosemicarbazide derivatives (2–5) were obtained. Thiosemicarbazide derivatives (2–5) by ring closure with 2% NaOH, provided 5-{2-[(furan-2-ylmethyl)sulfanyl]ethyl}-4-substituted-2,4-dihydro-3H-1,2,4-triazole-3-thiones (6–9). The new compounds were tested for their in vitro antimicrobial activity. Compounds 2, 3, and 6 had in vitro activity against Gram-positive reference strains of bacteria with MIC values: 250–500 μg/mL (for compound 2), 125–250 μg/mL (for compound 3), 500–1000 μg/mL (for compound 6). [Supplementary materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfer, and Silicon and the Related Elements for the following free supplemental files: Additional tables.]
Synthesis, Characterization and Ab Initio Calculations of Aminophosphine Derived From 4-Benzylpiperidine, its Chalcogenide Derivatives and Molybdenum(0) Complex
Creators: name: Sarıöz, Özlem
name: Çağrı Çırak
name: Muradoğlu, Vefa
name: Öznergiz, Sena
Publisher: name: Taylor & Francis
Year: 2014
Subjects: Uncategorized

description: Functionalized monoaminophosphine PPh2NC5H9CH2C6H5 has been synthesized by treating Ph2PCl with 4-benzylpiperidine. The ligand reacts with aqueous hydrogen peroxide, elemental sulfur or selenium to give the corresponding chalcogenides in good yield. The molybdenum complex of the aminophosphine has been obtained. All of the new compounds were obtained in good yields and were characterized by IR, NMR, elemental analysis. Theoretical calculations were carried out by using the Hartree-Fock and density functional methods with the 6-31G(d) basis set. [Supplementary materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements for the following free supplemental files: Additional tables and figures.]
Can molecular simulations reliably compare homogeneous and heterogeneous ice nucleation?
Creators: name: Atherton, Dominic
name: Michaelides, Angelos
name: Cox, Stephen J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In principle, the answer to the posed titular question is undoubtedly 'yes.' But in practice, requisite reference data for homogeneous systems have been obtained with a treatment of intermolecular interactions that is different from that typically employed for heterogeneous systems. In this article, we assess the impact of the choice of truncation scheme when comparing water in homogeneous and inhomogeneous environments. Specifically, we use explicit free energy calculations and a simple mean field analysis to demonstrate that using the 'cut-and-shift' version of the Lennard-Jones potential (common to most simple point charge models of water) results in a systematic increase in the melting temperature of ice I$_{\rm h}$. In addition, by drawing an analogy between a change in cutoff and a change in pressure, we use existing literature data for homogeneous ice nucleation at negative pressures to suggest that enhancements due to heterogeneous nucleation may have been overestimated by several orders of magnitude.
description: Main article: 9 pages, 7 figures. Supplementary Material: 10 pages, 4 figures
Evolution of Stellar Orbits Around Merging Massive Black-Hole Binary
Creators: name: Liu, Bin
name: Lai, Dong
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the long-term orbital evolution of stars around a merging massive or supermassive black-hole (BH) binary, taking into account the general relativistic effect induced by the BH spin. When the BH spin is significant compared to and misaligned with the binary orbital angular momentum, the orbital axis ($\hat{\mathbf{l}}$) of the circumbinary star can undergo significant evolution during the binary orbital decay driven by gravitational radiation. Including the spin effect of the primary (more massive) BH, we find that starting from nearly coplanar orbital orientations, the orbital axes $\hat{\mathbf{l}}$ of circumbinary stars preferentially evolve towards the spin direction after the merger of the BH binary, regardless of the initial BH spin orientation. Such alignment phenomenon, i.e., small final misalignment angle between $\hat{\mathbf{l}}$ and the spin axis of the remanent BH $\hat{\mathbf{S}}$, can be understood analytically using the principle of adiabatic invariance. For the BH binaries with extremely mass ratio ($m_2/m_1\lesssim0.01$), $\hat{\mathbf{l}}$ may experience more complicated evolution as adiabatic invariance breaks down, but the trend of alignment still works reasonably well when the initial binary spin-orbit angle is relatively small. Our result suggests that the correlation between the orientations of stellar orbits and the spin axis of the central BH could provide a potential signature of the merger history of the massive BH.
description: 13 pages, 15 figures, accepted for publication in MNRAS
Factors Influencing Patient Satisfaction in Home Care Services: A Systematic Review
Creators: name: Rahadian Syah, Deby Zulkarnain
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 420505
subject: Nursing workforce
classificationCode: 460210
subject: Satisfiability and optimisation
classificationCode: 420504
subject: Mental health nursing

description: This project consist of the underlying data anda extended data of Factors Influencing Patient Satisfaction in Home Care Services: A Systematic Review:PRISMA checklistPRISMA flowSummary review article
Synthesis and Antimicrobial Evaluation of 1-{3-[(Furan-2-Ylmethyl)Sulfanyl] Propanoyl}-4-Substituted Thiosemicarbazides and their Products of Cyclization to 1,2,4-Triazole Ring
Creators: name: Trotsko, Nazar
name: Wujec, Monika
name: Kosikowska, Urszula
name: Malm, Anna
Publisher: name: Taylor & Francis
Year: 2014
Subjects: Uncategorised

description: By the reaction of 3-[(furan-2-ylmethyl)sulfanyl]propanoylhydrazide with various isothiocyanates, the corresponding 4-substituted 1-[(furan-2-ylmethyl)sulfanyl] propanoylthiosemicarbazide derivatives (2–5) were obtained. Thiosemicarbazide derivatives (2–5) by ring closure with 2% NaOH, provided 5-{2-[(furan-2-ylmethyl)sulfanyl]ethyl}-4-substituted-2,4-dihydro-3H-1,2,4-triazole-3-thiones (6–9). The new compounds were tested for their in vitro antimicrobial activity. Compounds 2, 3, and 6 had in vitro activity against Gram-positive reference strains of bacteria with MIC values: 250–500 μg/mL (for compound 2), 125–250 μg/mL (for compound 3), 500–1000 μg/mL (for compound 6). [Supplementary materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfer, and Silicon and the Related Elements for the following free supplemental files: Additional tables.]
1-Methyl-3-(2-(Sulfooxy)Ethyl)-1H-Imidazol-3-Ium Thiocyanate as A Novel, Green, and Efficient BrØNsted Acidic Ionic Liquid-Promoted Regioselective Thiocyanation of Aromatic and Heteroaromatic Compounds at Room Temperature
Creators: name: Sajjadifar, Sami
name: Hosseinzadeh, Hossein
name: Ahmadaghaee, Saied
name: Eshagh Rezaee Nezhad
name: Saaid Karimian
Publisher: name: Taylor & Francis
Year: 2014
Subjects: Uncategorised

description: An efficient and simple method for the preparation of 1-methyl-3-(2-(sulfooxy)ethyl)-1H-imidazol-3-ium thiocyanate ([Msei]SCN)as a Brønsted acidic ionic liquid (BAIL) is described, and it is used in the highly efficient regioselective thiocyanation of aromatic and heteroaromatic compounds via a green and simple protocol. [Msei]SCN as a novel IL and thiocyanation agent, H2O2 as a mild and environmentally friendly oxidant, and H2O:ethanol(1:4) as a solvent were used. This procedure provided the target thiocyanates in high yield and very short reaction time. [Supplementary materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements for the following free supplemental files: Additional figures.]
Synthesis, Crystal Structure, and Biological Activity of A Novel 1,2,3-Thiadiazole Compound Containing 1,2,4-Triazole Moiety
Creators: name: Min, Li-Jing
name: Tan, Cheng-Xia
name: Weng, Jian-Quan
name: Liu, Xing-Hai
Publisher: name: Taylor & Francis
Year: 2014
Subjects: Uncategorised

description: A new 1,2,3-thiadiazole compound containing 1,2,4-triazole moiety, C15H14FN5 O2S2, has been synthesized and the crystal structure was determined by single crystal X-ray diffraction study. The biological activity of the title compound was determined and the results showed that title compounds 10 showed higher inhibition abilities of rape root than the control cyclopropane-1,1-dicarboxylic acid at 100 μg/mL (73%) and weak activity against Echinochloa crusgalli (28%) and KARI (35%) at 100 μg/mL. [Supplementary materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements for the following free supplemental files: additional text, figures, tables.]
Synthesis and Antimicrobial Activities of Some 6-Methyl-3-Thioxo-2,3-Dihydro-1,2,4-Triazine Derivatives
Creators: name: El-Barbary, Ahmed A.
name: El-Shehawy, Ashraf A.
name: Abdo, Nabiha I.
Publisher: name: Taylor & Francis
Year: 2014
Subjects: Uncategorised

description: 4-Arylidene-imidazole derivatives (4a,b) were readily prepared by reacting 4-am- ino-6-methyl-3–thioxo-2,3–dihydro[1,2,4]triazin-5(4H)-one (1) with 4-arylidene-2-phenyl- 4H-oxazol-5-one (2). Reaction of 1 with some aromatic aldehydes in presence of triethylphosphite exclusively afforded the corresponding aminophosphonates 5a-c. Reaction of 1 with 3-phenyl-1H-quinazoline-2,4-dione (6a) and/or 3-phenyl-2-thioxo-2,3-dihydro- 1H-quinazolin-4-one (6b) gave 2-(6-methyl-5-oxo-3-thioxo-2,5-dihydro-3H-[1,2,4]triazin-4-ylimino)-3-phenyl-2,3-dihydro-1H-quinazolin-4-one (7). Moreover, on treating 1 with 2-phenylbenzo[d][1,3]thiazine-4-thione (8), 6-methyl-4-(2-phenyl-4-thioxo-4H-quinazolin-3-yl)-3-thioxo-3,4-dihydro-2H-[1,2,4]triazine-5-one (9) was obtained in 65% yield. Reaction of 1 with 4-sulfonylaminoacetic acid derivatives (10a,b) afforded the corresponding sulfonamides (11a,b), respectively. Acid hydrolysis of 11a afforded 7-aminomethyl-3-methyl[1,3,4]thiadiazole[2,3-c][1,2,4]triazin-4-one (12). 4-Amino-6-methyl-3-(morpholine-4-ylsulfanyl)-4H-[1,2,4]triazin-5-one (14) was prepared by reacting compound 1 with morpholine in presence of KI/I2, while 3,3′-bis(4-amino-6-methyl-5-oxo-triazinyl)disulfide (16) was obtained by oxidation of 1 with lead tetraacetate. The antimicrobial activity of the products was evaluated against Gram-positive and Gram-negative bacteria as well as the fungus Candida albicans. [Supplementary materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements for the following free supplemental files: Additional text, figures, and tables.]
Data-Driven QoE Model for Addis Ababa LTE Video Streaming Using Fuzzy Logic Inference System
Creators: name: Aysheshim, Demilie
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2020

description: Nowadays, the video streaming services become the most dominant service as people are more interesting watching online television programs and Video on Demand (VoD). This requires a high speed and high capacity network infrastructure. The Long Term Evolution (LTE) network infrastructure of Addis Ababa has faced this network capacity and data rate demand in order to have a good Quality of Experience (QoE). To takeover this challenge, Ethio Telecom should have appropriate assessment methodology for QoE. This thesis outlines the means of QoE modelling issue to measure QoE objectively. It proposes a QoE model which is used to measure the QoE from Quality of Service (QoS) parameters using Fuzzy Logic Inference System (FIS). This has been done by collecting end-to-end QoS data from network management system which is used as input for the model and the proposed model has been validated using a dataset collected from customer survey. The Model developed is essential for replacing the subjective measurement techniques which are costly and inefficient being influential to user context, terminal characteristics, application software, user capability, etc. In addition, the model developed is helpful for business decision making, network planning, optimization and operational support activities in manual systems or system based for self-organizing networks according to the infrastructures implemented. The result of correlation, regression, and Four-way ANOVA show that the Stall Frequency (SF) and the Start Delay (SD) plays the major impact on the LTE video streaming QoE by 33% and 25% respectively. The validation result shows the proposed model is an accurate, consistent and linear compared to the existing models.
Solar system constraints of a polymer black hole in loop quantum gravity
Creators: name: Liu, Yun-Long
name: Feng, Zhao-Qing
name: Zhang, Xiang-Dong
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A new polymer black hole solution in loop quantum gravity was proposed recently. The difference between the polymer black hole and Schwarzschild black hole is captured by a quantum parameter $A$. In order to get the constraints on parameter $A$, we consider the observational constraints imposed on $A$ by using the Solar System experiments and calculate the deflection of light, Shapiro time delay, perihelion precession and obtain the effects associated with parameter $A$. Moreover, the parameterized post-Newtonian approach of this loop quantum gravity black hole was also carried out. It turns out the tightest constraint on $A$ can be improved to $0
description: 13 pages, 1 table; revised version, 16 pages, accepted by PRD
Pair-Level Supervised Contrastive Learning for Natural Language Inference
Creators: name: Li, Shu'ang
name: Hu, Xuming
name: Lin, Li
name: Wen, Lijie
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Natural language inference (NLI) is an increasingly important task for natural language understanding, which requires one to infer the relationship between the sentence pair (premise and hypothesis). Many recent works have used contrastive learning by incorporating the relationship of the sentence pair from NLI datasets to learn sentence representation. However, these methods only focus on comparisons with sentence-level representations. In this paper, we propose a Pair-level Supervised Contrastive Learning approach (PairSCL). We adopt a cross attention module to learn the joint representations of the sentence pairs. A contrastive learning objective is designed to distinguish the varied classes of sentence pairs by pulling those in one class together and pushing apart the pairs in other classes. We evaluate PairSCL on two public datasets of NLI where the accuracy of PairSCL outperforms other methods by 2.1% on average. Furthermore, our method outperforms the previous state-of-the-art method on seven transfer tasks of text classification.
description: Accepted at ICASSP 2022