bluuebunny/crossref_metadata_2025 huggingface dataset:
Granice twórczości zależnej i inspirowanej w poglądach doktryny i orzecznictwa sądowego
Authors: Konikowska-Kuczyńska Justyna
Published: September 2023

Problematyka dotycząca twórczości zależnej i inspirowanej uregulowana jest w art. 2 ustawy o Prawie autorskim i prawach pokrewnych. Należy zwrócić uwagę, że omawiając zagadnienie dotyczące twórczości zależnej niejednokrotnie konfrontuje się ją z twórczością inspirowaną. Nie budzi wątpliwości fakt, że ustawodawca nie określa jednak przejrzyście granicy między tymi rodzajami twórczości. Co za tym idzie błędna kwalifikacja utworów może powodować naruszenie praw autora. Podkreślić trzeba, że sądy krajowe wielokrotnie wypowiadały się w  materii dotyczącej granicy pomiędzy twórczością zależną a inspirowaną. Podejmowały próby udzielenia wskazówek określających owe granice, jednak wskazówki te były bardziej ogólne. Z tego powodu określenie klarownych granic między dziełem zależnym a inspirowanym sprawia duże trudności w praktyce orzeczniczej oraz literaturze przedmiotu. Tekst ma na celu przedstawienie problematyki dotyczącej granicy między twórczością zależną a inspirowaną i usystematyzowanie poglądów wyrażonych w doktrynie i judykaturze w tej materii, a także wskazanie kryteriów odróżniających utwór zależny od inspirowanego. Aby osiągnąć wskazany cel w artykule analizie poddano obowiązujące przepisy prawa, orzeczenia sądów a także poglądy przedstawicieli doktryny dotyczące tego zagadnienia. Wydaje się, że należałoby podzielić pogląd na temat możliwości wprowadzania do ustawy odrębnego rozwiązania normatywnego dotyczącej utworu inspirowanego poza art. 2 ustawy o Prawie autorskim. Z tego względu pojawiła się potrzeba bliższego przyjrzenia się zagadnieniu dotyczącemu granicy pomiędzy twórczością zależną a inspirowaną.
Kilka uwag o roli NGO w tworzeniu globalnego ładu podatkowego
Authors: Lipka Krzysztof
Published: September 2023

Organizacje pozarządowe odgrywają ważną rolę w tworzeniu globalnych norm w wielu dziedzinach (np. prawa człowieka i ekologia). Kształtujący się właśnie światowy ład podatkowy wydaje się być sferą, w której zaangażowanie NGO jest słabsze, a procesy zdominowane są przez organizacje międzynarodowe (OECD), kraje promujące własne interesy oraz wielkie korporacje.
Celem artykułu jest analiza roli, jaką organizacje pozarządowe mogłyby pełnić w kreowaniu globalnego porządku podatkowego oraz zbadanie, które funkcje mogą być przez nie realizowane. Wnioski z badań potwierdziły, że choć obecnie NGO mają ograniczony wpływ na globalny ład podatkowy, to ich rola może i powinna być większa. Podstawowe funkcje, które są one władne wypełniać to promowanie wiedzy o problematyce, monitorowanie podejmowanych działań i wpływanie na przyspieszenie procesów.
DATA CONSISTENCY MODELS IN APPLICATIONS WITH MICROSERVICE ARCHITECTURE
Authors:   National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv, Kornaga Ya. I.
Published: September 2023

Individual database transactions can easily meet ACID requirements and ensure strong consistency, but distributed transactions have a number of limitations to address. Hard transactions are are found to be fully ACID compliant, while using flexible transactions isolation is not fully guaranteed. In practice, the isolation requirement is waived to some extent to ensure high throughput and system performance. Flexible transactions generally adhere to the Basic Availability, Flexible State, Eventually Consistency (BASE) theory. The BASE theorem is an extension of the CAP theorem. This is the balance between consistency and availability in CAP. According to the BASE theory, we cannot achieve strong consistency, however, each program can achieve ultimate consistency by using an appropriate method according to its own characteristics. CAP shows that a distributed system cannot achieve consistency, availability, and distribution resilience at the same time. It is worth to pay attention at the stage of system design. It was found that hard transactions are strive for persistent consistency, and so they sacrifice high availability. Flexible transactions sacrifice consistency in exchange for high system availability.
Huawei Genex Discovery big data tool for wireless network analysis
Authors:   State University of Telecommunications, Sahaydak V. A.
Published: September 2023

In this article was described system for monitoring the status and analysis of wireless network. Subsystems of solution were described with possible data feeds from different data sources including Huawei U2000, DGW, NetProbes, Trace server, SAU. Supported features for each generation of wireless network have been studied. Each of functions can provide statistics for cell or base station from network point, neighbor cell, grid, location, vendor equipment or even user terminal point of view in real time. More details were provided on features such as Network Health Evaluation, Coverage Analysis. Network Health Evaluation provides evaluation functions at the macro level, including network-level evaluation and arealevel evaluation. The network-level evaluation function evaluates a network from multiple dimensions such as coverage, performance, traffic and scores the heath of the network in combination with geographic observation results, which helps users quickly understand the network status and trend. The area-level evaluation function scores the health of each evaluated area on a network. It helps users quickly identify problem areas. The area-level evaluation function allows users to set some areas as valuable areas, where quality counter greatly affects the health score of the areas and entire network. Coverage Analysis analyzes and displays the coverage analysis results on maps based on the MRs reported by common subscribers’ mobile phones, thereby helping operators to evaluate network coverage comprehensively and at low costs and identify problems such as weak coverage and overshoot coverage. Conclusions were made about the possibility of GENEX Discovery data integration with other data analysis tools or machine learning: Applications can be used to troubleshoot and analyze wireless network; Due to architecture similarities system can be co-deployed with Huawei SmartCare to extend both systems capabilities; Data from GENEX Discovery can be exported to other data analysis or ML tools by DSI service; 5G wireless network analysis is supported, which allow to analyze IoT data from Smart City;
Іnvariant control systems in modern communication technology
Authors:   State University of Telecommunications, Dmitriyev V. Ye. , Zakharzhevskyy A. H. , Сhumak N. S.
Published: September 2023

The article presents the results of research and ways to solve one of the main tasks in communication technology — combating interference, weakening the influence of interference. The theory of electrical communication is the scientific and technical basis of the problem. A comparative analysis of the peculiarities of the problem of the invariant system in the theory of automatic control and in communication technology was carried out. The elements of the theory of invariant communication systems were studied. Invariant control systems (CS) of different classes are analyzed and their capabilities are outlined. The conditions for ensuring the invariance of the CS, the optimal absolute invariant CS and the quantitative characteristic of noise immunity are determined, and the corresponding mathematical dependencies are given. The application of the researched methods to achieve absolute or relative invariance is proposed.
Application of machine learning in the integration of satellite and UAV communication
Authors:   State University of Telecommunications, Yakovets V. P.
Published: September 2023

The integration of satellite and UAV communication is a promising direction of telecommunications development. Due to their low cost and high mobility, UAVs can take on a large number of important tasks, including the transmission of data both between subscribers and between other UAVs, while networks using UAVs are easily and quickly deployed. Unmanned aerial vehicles as mobile base stations may be deployed along with non-terrestrial networks, such as Low Earth Orbit satellite constellations, which is why the integration is necessary. Satellite communication in a multi-level system is used as a trunk communication channel to transmit large amounts of data over long distances. It is mostly used in areas with low coverage levels but NTN could also be used for coverage improvement in cities when TN operator rents the spectrum and infrastructure from NTN operator. The use of artificial intelligence technologies will improve the transmission parameters of both the satellite and UAV segment of the multi-level communication system, as well as automate the process of distributing traffic from mobile stations to the UAV and satellite segment. UAVs have their shortcomings, which can be solved with the help of artificial intelligence technologies, namely machine learning. Challenges related to UAVs — short flight time, deployment and management of a swarm of UAVs, and issues related to data security and loss of control of aircraft. Problems of the satellite segment in an integrated network can be considered as such: interference caused by human errors and the problem of load distribution among users. The article examines methods of reducing the influence of interference in the satellite segment of a multi-level communication system using an autoencoder and optimizing satellite communication, as well as machine learning models for UAV communication.
Positioning of objects using wireless networks
Authors:   State University of Telecommunications, Mitin Ye. Yu.
Published: September 2023

Today, there are a large number of technical solutions to the problem of determining the location of objects in space, which are united by a single term -— positioning systems. All positioning systems can be divided into global positioning systems and local positioning systems that operate in a limited area. The article analyses the techniques and information technologies for positioning a user’s computer device indoors. The popular technology for determining the user’s location, which is the Global Positioning System (GPS), does not work well enough in enclosed spaces and buildings. The most popular alternative information technologies for positioning in confined spaces today are Wi-Fi, iGPS and other technologies based on the processing of relevant visual images. The article analyses these technologies, their functioning features, as well as advantages and disadvantages in the context of their use in various types of enclosed spaces. The analysis has shown that for the task of positioning devices in the premises, the positioning technology based on Wi-Fi networks has the highest accuracy and lower costs for system deployment and operation. Positioning in Wi-Fi networks is carried out using several methods for determining the location of devices in space, based on technologies for calculating the distance from access points to the user. All currently relevant technologies have been considered in this paper. All the methods used in positioning were described and analysed according to the criteria in order to select the best one for implementation in a Wi-Fi network positioning system. Based on the results of the analysis, the trilateration method was selected because it has high accuracy and relatively low system deployment costs.
Information technology for recognition of handwritten ukrainian letters and numbers using synthetic data sets
Authors:   State University of Telecommunications, Chychkarov Ye. A.
Published: September 2023

The paper considers several variants of the architecture of convolutional neural networks for recognizing isolated handwritten digits and Ukrainian letters. The results of recognizing different images containing letters and numbers were compared on models with different architectures. Several variants of rather complex architectures of neural networks were considered. Research was conducted with VGG16 and VGG19 architectures, ResNet or ResNetV2, MobileNet or MobileNetV2, DenseNet. The possibility of learning convolutional neural networks with the help of a synthetic data set built on the basis of handwritten or cursive fonts is shown. The size of the training data set significantly affects the reliability of character recognition. The data sets used in the work correspond in volume to the well-known EMNIST Letters dataset. The lower limit of the sample size, which provides acceptable recognition accuracy, was about 1500 characters per class. Reducing the sample by reducing the number of symbols per class leads to a significant decrease in recognition accuracy (from 90-100% accuracy of recognizing elements of real inscriptions to 40-60% with a 4-fold reduction in the sample size). Thus, when using deep neural networks to recognize letters or numbers, the reliability of recognizing elements of real inscriptions depended primarily on the size of the training data set. The accuracy of recognition of the test data set after training all variants of the models was quite high - 97-98% and higher. However, the generation of training data sets of small size — 300-500 images per class - practically did not provide reliable recognition. In general, when comparing the achieved recognition accuracy of real images and the model training speed, the best performance was provided by the DenseNet or ResNetV2 family models. Experiments with changing the optimization algorithm compared to Adam did not give any improvement in the accuracy and reliability of recognizing real samples. Increasing the number of model training epochs beyond the specified one also did not change the results.
Analysis and identification of network failures in the information network
Authors:   Taras Shevchenko National University of Kyiv, Kyiv, Buchyk S. S.
Published: September 2023

This article shows that each information system has its own characteristics, which are determined by the scope of its application. The importance and responsibility of tasks solved using real-time systems have led to high requirements for the reliability of these systems, and the failure of the entire information system or its individual components can lead to negative consequences. Network failure recognition is based on the principle of determining the nature of network failures based on the product system. This principle is implemented through a dialogue procedure within the framework of the Bayesian approach, which allows you to accumulate information coming from various sources in order to confirm (not confirm) a certain hypothesis. A logical conclusion management strategy was developed, the control parameters of which are the current probability of the truth of the hypotheses, the limits of their change, and the weight of the signs associated with these hypotheses. Accounting for the current probability of hypotheses and the limits of their change allows in the process of conclusion, firstly, to focus attention on the most promising (probable) hypothesis, and secondly, to stop the conclusion after reaching the upper threshold, which will reduce the number of signs to be checked, and thus shorten the dialogue time yourself. In addition, having reached the lower threshold, the hypothesis is rejected as implausible and no longer participates in the conclusion process, which also leads to a reduction in recognition time. Accounting for the weights of signs in the process of logical inference allows you to first of all check those signs that maximize the probability of the plausibility of hypotheses. In general, the developed strategy, unlike the classical scheme, generates a purposeful process of testing the plausibility of hypotheses, which leads to a reduction in recognition time.
Survival, Failure Patterns, and Toxicity Outcomes in Endometrial Cancer Patients Receiving Adjuvant Radiotherapy
Authors: HALİS Hatice , GÖKHAN AÇIKGÖZ Sedef
Published: September 2023

Objective: This study aimed to investigate the survival outcomes, recurrence patterns, and treatment-related toxicities of endometrial cancer (EC) patients who underwent adjuvant radiotherapy.

Materials and Methods: Between January 2012 and December 2021, one hundred fourteen patients who underwent adjuvant radiotherapy with the diagnosis of endometrial cancer were retrospectively analyzed. Cases were evaluated for overall survival (OS), disease-free survival (DFS), local recurrence-free survival (LRFS), cancer-specific survival (CSS), and distant metastasis-free survival (DMFS).

Results: Median follow-up was 63 months (8 -135). At 5 years OS, DFS, LRFS, CSS, and DMFS were 85.5%, 90.5%, 98.9%, 94.1%, and 90.5%, respectively. Univariate analysis of lymphovascular space invasion (LVSI) is statistically significant for DFS, DMFS, and CSS, respectively (p=0.019, p=0.019, p=0.021) and histology, tumor grade, stage were statistically significant for LRFS, respectively (p=0.031, p=0.010, p=0.049). Grade 1 and 2 acute gastrointestinal toxicity were observed in 40 patients (35.1%). Grade 1 acute genitourinary toxicity was observed in 35 patients (30.7%). Grade 3 late genitourinary and gastrointestinal toxicity was observed in 0.9% and 1.8%, respectively.

Conclusion: Histology, grade, LVSI, and stage didn’t significantly affect overall survival, but LVSI and stage were the most influential prognostic factors on relapse patterns. Adjuvant radiotherapy is safe and well tolerated by patients with endometrial cancer with acceptable toxicity.
Interobserver Agreement in Magnetic Resonance Imaging of Active Sacroiliitis
Authors: GENÇ Ahmed Cihad , KARA Ahmet Burak , TÜRKOĞLU GENÇ Fevziye , ÖZTÜRK Zeynep , KARATAŞ Damla , TOÇOĞLU Aysel , ERKORKMAZ Ünal , GÜNDÜZ Yasemin , GÖNÜLLÜ Emel
Published: September 2023

Introduction

Axial spondyloarthritis has characteristic clinical features such as enthesitis, sacroiliitis and spondylitis, and extra-articular manifestations. Sacroiliitis (SI) occurs as a result of inflammation of the sacroiliac joint. Magnetic resonance imaging (MRI) of sacroiliac (SI) joints is used to detect early sacroiliitis. Sometimes, there can be variations in the interpretation of MRI findings of the SI joint among observers. Our aim was to investigate the inter-observer agreement among the observers.

Materials and methods

The study included the MRI results of 1150 patients who were diagnosed with active or chronic sacroiliitis based on the findings from sacroiliac MRIs, or whose MRI was deemed indicative of sacroiliitis by the rheumatologist. 1150 MRIs were re-evaluated by a different and expert radiologist.

Results

Out of the total 1150 patients investigated within the scope of this study. A statistically significant disparity emerged between the assessments provided by the expert radiologists and those obtained from outsourced radiologist evaluations.

Conclusion

The diagnosis of spondyloarthropathy may be delayed for some reasons. If the patient's clinic and MRI report are not consistent, the patient should not be removed from follow-up.
Japan’s Energy Policy: Current Challenges and Problems
Authors: Korneev Valery
Published: September 2023

The sixth edition of the Strategic (Basic) Energy Plan until 2030 was published in Japan in October 2021. The primary goal remained the same — to maximize energy independence by reducing purchases of primary energy resources and to increasing the share of renewable energy in the country’s energy balance from 18 % to 36 % relative to 2021 levels. However, these steps are not enough even to reduce purchases of oil, coal and natural gas by about 20% in the coming years. Thus, the issue of restarting the majority of existing nuclear power plants and the construction of new power units come to the fore again, since they are providing most stable energy amidst ongoing market turbulence. Japan has made a lot of efforts to revise the nature of its energy policy in order to find an acceptable balance between abandoning nuclear energy and maintaining basic indicators of energy supply reliability, but these efforts have partly led the country into an “energy impasse” when current demands are partially addressed, but the long-term development of the industry remains a big question. This is especially noticeable given the fact that Japan has made significant commitments to reduce CO2 emissions and achieve economy-wide carbon neutrality by 2050, which requires a revision of many benchmarks and a rethinking of strategic documents. The search for answers to this question is the main purpose of this article.
Historical Experience of the Development of Chinese Civilization
Authors: Burov Vladilen G.
Published: September 2023

Chinese civilization is one of the oldest. For many centuries, it developed exclusively on its own basis. In the twentieth century, acquaintance with Western civilization led to debates about traditional Chinese values, in which various points of view were expressed, ranging from complete denial to total praise. In recent decades, there has been a gradual realization that the teachings of Confucius and his followers represent a great spiritual wealth. There is a re-evaluation of the teachings of Chinese thinkers of the past. The historical experience of China's civilizational development contains valuable lessons for Russia.
Humanitarian Activities of International Structures in Africa. Some Aspects
Authors: Grishina Nina V.
Published: September 2023

The intensification of multilateral humanitarian activities of international organizations is especially noticeable in African countries, most of which belong to the poorest in the world. Areas of response are zones of armed and military conflicts, territories whose inhabitants have suffered as a result of natural disasters and dangerous diseases. As a rule, women, children and elderly people need emergency assistance first of all.
Most humanitarian missions operate under the auspices of the UN, the African Union, the European Union, and UNICEF. Significant assistance comes from volunteers working as part of humanitarian organizations – citizens of African, European, Asian countries, representatives of both Americas. Various socio-cultural and socio-economic programs are being implemented, aimed, in particular, at providing young people of both sexes with access to education, introducing the population to new types of employment, and mastering modern agricultural machinery. Financial support is provided by the entities of the World Bank.
In their work, humanitarian workers often rely on the support of community religious leaders, whose authority allows them to conduct conversations with the population on topical issues. The focus is on the fight against diseases, poverty, gender inequality, domestic violence, HIV/AIDS and environmental degradation.
For many decades, the Russian Federation has been involved in international humanitarian activities, considering it as one of its foreign policy tasks to strengthen stability and security worldwide.
Clinical and pathological staging of primary carcinoma of the larynx
Authors: Hamza Al-badri Musaid H. , Abbas Al- Rubai Thamer M. , Salman Ali L.
Published: September 2023

Background: Staging of primary carcinoma of the larynx play an important role in surgical management of the disease .This staging depends on the clinical finding and radiological examination , supported by pathological assessment of the excised tumorObjectives: To evaluate the accuracy of clinical and radiological staging Patients’ and methods: Forty-two patients with laryngeal carcinoma were admitted to the ENT Department during the period from June 2009 through October 2010. Each patient was staged by clinical examination and computed tomography. Evaluation of the results compared to the final diagnosis of staging , based on the pathological staging of specimens of patients who underwent total laryngectomy and the highest T stage was obtained from clinical and CT staging for patients with early laryngeal carcinoma(T1-T2) .Results: The clinical staging of laryngeal carcinoma showed: high accuracy in staging was on glottic tumours (83.3%), especially T1 glottic tumours (100%),(small and superficial lesions), and lower accuracy in staging of supraglottic and transglottic tumors (61.9%) , (55.6% ) respectively.Underestimation of all tumors was 31.4% . The CT staging of laryngeal carcinoma showed: very high accuracy in staging transglottic and supraglottic tumours (100%), (85.7%) respectively in comparison to clinical staging and lower accuracy (75%) in staging glottic tumours. Underestimation of all tumours was 11.5 % of cases (especially small and superficial lesions).Conclusions: High accuracy rate based on clinical examination was found in glottic carcinoma and high accuracy rate based on radiological examination was found in supraglottic carcinoma. Clinical examination and CT scan are complementary for sraging of carcinoma of larynx .
Design and Simulation of a Piezoelectric Actuator for Deep-Sea Release Device
Authors: Zhang Anti , Wang Liang , Jin Jiamei , Wang Xinjun
Published: September 2023

For the traditional underwater acoustic release device with complex structure, large volume and mass, and difficult dynamic sealing in deep-sea high-pressure environment, a novel piezoelectric actuator for deep-sea release function is proposed. The actuator consists of a piezoelectric composite stator and rotor, and is based on the basic principles of inverse piezoelectric effect and friction transmission, which achieves the separation and release between the stator and rotor through the rotational bending motion coupled by two-phase bending vibration. The proposed actuator adopts a simple and compact structure, is easy to control, reduces the volume and weight of the entire release system, and increases its reliability in deep-sea environments by allowing the friction-driven interface to be directly in contact with seawater, eliminating the need for dynamic seals. First, a three-dimensional solid model of the actuator was established through structural dynamics analysis, and its driving principle was theoretically analyzed. The equation of the elliptical motion trajectory of the stator’s driving mass point was derived. Then, finite element modal simulation and analysis were performed on the piezoelectric composite stator, and the structural parameters of the stator were optimized based on the design requirements of frequency consistency and distance from adjacent interference modes. Finally, the amplitude-frequency characteristics, working mode shape, and driving mass point motion trajectory of the stator were analyzed through finite element harmonic response simulation. This paper proposes a novel deep-sea release piezoelectric actuator, which offers a fresh idea for advancing deep-sea release devices technology.
Evaluation and Optimization of Satellite Assembly Datum Accuracy Based on Multiocular Vision
Authors: Zang Ziyi , Zhang Jie , He Yang
Published: September 2023

As the demand for large loads such as oversized cameras, antennas, and robotic arms continues to increase, the assembly tasks of medium-sized and large satellites have shown explosive growth. Compared to small satellites, their assembly is more difficult, their development cycle is longer, and they occupy more resources, placing higher requirements on the accessibility, accuracy, efficiency, and other aspects of measurement projects. This paper studies the benchmark establishment method suitable for multi-platform satellite structure assembly, analyzes the impact of the issue of “evaluating large size products with small size benchmarks” on satellite structure assembly measurement data in principle, and studies the “one point plus two vectors” coordinate construction method using the horizontal adjustment function of the instrument itself and the assembly platform transfer device in combination with the assembly process status of the rotary table and the satellite assembly bracket, The principle and implementation process of the method were analyzed and elaborated, and field tests were conducted to verify it. Through theoretical analysis and comparison of data results, the proposed benchmark establishment method was evaluated and optimized.
Influence Law of Different Factors on the Roll Forming Precision of Aluminum Alloy Cylinder with Variable Curvature Section
Authors: Li Weihao , Song Yanli , Lu Jue , Wang Xuchu , Zhu Chundong , Yang Lin
Published: September 2023

High precision roll forming of cylinders with variable curvature section is a technical challenge for high-performance manufacturing of oil and gas transportation tanks. In this work, the large cylinder with variable curvature section was taken as the object of study, a four-roll roll bending FE (Finite Element) model of large cylinder with variable curvature section was established to investigate the influence of driving roll speed on the precision of cylinder forming quality, and the influence of adjacent arc segment size on the precision of cylinder roll forming was obtained by the segmental forming simulation of the cylinder. The results show that the forming radius increased sharply after the speed exceeded the threshold value and the main factors of roll forming radius error is the radius and length of the front arc, the radius and length of the middle arc, and the radius and length of the rear arc.
An Intelligent State of Health Estimation Method for Lithiumion Batteries
Authors: Li Heng , Peng Rongjun , Zhu Zhiteng , Zhu Ren
Published: September 2023

It is very crucial for Lithium-ion batteries (LIB) to estimate the state of health (SOH). In this research, we come up with a method to estimate SOH for LIB based on Gaussian process regression (GPR). We first extract the capacity curve about increment according to the Levenberg-Marquardt (LM) algorithm. Then, the change trend of capacity curve about increment in the aging process is analyzed, and the agingrelated features are extracted. Finally, the relationship between the features and SOH is established through the mapping based on the GPR method. Experiment results prove the validity of the idea that we propose.
Mechanical Milling and Surface Texturing of 3Y-TZP Ceramics: A Mini Review
Authors: Xu Jinyang , Shen Jiaxin , Li Linfeng
Published: September 2023

The 3 mol% yttria-stabilized tetragonal zirconia polycrystalline (3Y-TZP) ceramics have been extensively used in restorative dentistry due to their excellent esthetic effects, good chemical stability, and superior biocompatibility. Mechanical milling and surface texturing are two important aspects when dealing with the processing of zirconia ceramics for dental applications. The present paper reviews the recent advances achieved in the mentioned research fields. The fundamental milling features of 3Y-TZP ceramics are initially introduced with a particular focus on the cut surface quality. The effects of different process parameters on the machinability of 3Y-TZP ceramics are briefly summarized. Additionally, the basic mechanisms of surface texturing of these bioceramics are introduced. The mechanisms controlling how the microtextures affect the service performances of 3Y-TZP are carefully reviewed. Finally, the current research challenges and the future perspectives concerning the mechanical processing of 3Y-TZP are outlined.
Study on a New Vehicle Mounted Isolator with NSSM and CRSM
Authors: Wei Chunyu , Pang Xiangyun
Published: September 2023

The zero-stiffness structure has excellent vibration attenuation performance. A new vehicle mounted isolator with negative stiffness spring mechanism (NSSM) and cam-roller spring mechanism (CRSM) is proposed. It has quasi-zero stiffness (QZS) in a small range centered on the initial equilibrium position. Even if the external excitation is strong, this isolator can still maintain stability, and the performance of low dynamic stiffness is not weakened. This characteristic makes the isolator particularly suitable for the vehicle mounted situation. For the harmonic input, the analytical solution of the sprung mass acceleration of the isolator is solved in the time domain. It is concluded that the RMS value and the maximum value of the isolated mass acceleration are proportional to the amplitude of the excitation input. The simulation is carried out and the results show that the theoretical analysis is correct. It also shows that CRMS can effectively suppress the influence of external disturbance without reducing the performance of NSSM, and greatly improve the anti-interference ability of the isolator.
Environmental Perception Algorithm for Multi-Target Autonomous Driving Based on YOLOv7-CBAM
Authors: Yue Shiqin , Cai Yonghua
Published: September 2023

In this study, we proposed an improved YOLOv7 network for autonomous driving multi-target detection, YOLOv7-CBAM. Based on YOLOv7, a tiny target detection structure was added to the backbone network for detecting tiny-scale targets. The ResNet-CBAM structure was utilized to reconstruct the YOLOv7 backbone network for enhancing the image feature extraction capability of network model, thereby obtaining more nonlinear features information from different feature layers. Besides, the Kernel-means algorithm was used for obtain the anchor instead of the K-means. Experiments showed that the proposed YOLOv7-CBAM network demonstrates faster convergence and reaches a mean average precision value of 82.0% on the Udacity Self Driving Car dataset, superior to the original YOLOv7 model.
Study on the Method of Divisional Filling for High Fill Embankment Based on Settlement Control
Authors: Xiao Jiahao , Liu Longwu , Xie Yao , Yi Wangcheng , Qiu Xiang
Published: September 2023

The high embankment is divided into two types of zones according to the settlement amount, the pavement settlement affected zone which mainly controls the embankment settlement and the non-pavement settlement affected zone which mainly controls the slope stability. Based on the functions and bearing capacity of the two types of zones, according to the characteristics analysis of the packing gradation and compaction curve, the relationship between the compaction degree and the elastic modulus and CBR, the classification method of the filling, the pre-zoning method of the excavation area and the filling selection method are proposed; taking the high fill embankment of granite residual soil as an example, this paper also analyzes the zoning filling methods of high fill embankment from excavation zoning, filling selection, zoning paving and filling to intelligent compaction control, which provides a new idea for controlling the construction quality of high embankment; Finally, by using finite element software to compare and analyze the non soil rock mixed filling scheme, the bottom cushion soil rock mixed filling scheme and the partition filling scheme, it is concluded that the partition scheme can achieve the effect of land saving by steepening the slope with its high stability coefficient advantage over other filling schemes.
Diffusion of Grouting Cement in Water-Rich Ultracataclasite Stratum
Authors: Wang Chuan , Xie Yunpeng , Li Bin , Lei Yang , Li Mengtian , Zhang Shengtao
Published: September 2023

When the tunnel and underground engineering construction encounters water-rich soft and broken surrounding rock, it is very easy to occur serious disasters such as mud inrush, water inrush and collapse, threatening the safety of engineering construction. Taking the water-rich ultracataclasite stratum exposed by the 4th construction branch of Xianglushan Tunnel in the Central Yunnan Water Diversion Project as an example, this stratum has strong compactness, weak permeability, softening in water and other unfavorable geological characteristics. During the excavation process, several major mud and water inrush geological disasters have occurred. In this paper, the basic physical and mechanical properties of water-rich ultracataclasite rock are tested based on field engineering examples, and the grouting diffusion law under this stratum condition is studied based on PFC2D numerical calculation software. The research results show that according to the basic physical and mechanical parameters such as density, water content, permeability coefficient, particle size distribution, specific gravity, porosity, cohesion and internal friction angle obtained from the laboratory test of ultracataclasite rock, the analysis shows that the shear strength of the water-rich ultracataclasite stratum is low, further leading to mud outburst and collapse disasters. Under the comprehensive consideration of the number of split grout veins, the distribution of diffusion range and the risk of damage to the existing support, the optimal grouting pressure is determined.
Time Domain Analysis of Suspension Bridge Flutter Based on State Space
Authors: Liu Ming , Qin Jian , Yuan Congsen , Yu Mei
Published: September 2023

Flutter of suspension bridge is an aerodynamic instability phenomenon that occurs due to interactions between wind and structural vibration, which is an issue in the wind-resistant design of long-span suspension bridges. Equations of motion for the flutter vibration of suspension bridges are established in time domain, and then these equations of motion are transformed into state space. By introducing the precise integration method, flutter equations are solved in time domain, the critical flutter velocity and displacement time history of suspension bridge are obtained. Finally, the method presented in this paper is verified using a numerical example, the analytical results were compared with the wind tunnel test, it showed that the flutter analysis results are in good agreement with the results of wind-tunnel test. Compared to conventional flutter analysis in frequency domain, the advantage of the method presented in this paper is that there is only one variable of wind speed in flutter analysis in time domain.
Design Parameter Optimization of Feet-Lock Pipes for Small Space Tunnels in Jointed Rocks
Authors: Shi Peijie , Yang Shaozhan , Yang Shuo , Zheng Sizhuo , Guo Hongwei , Ge Ruoyu , Lin Enpeng
Published: September 2023

Feet-lock pipes are installed at the foot of steel arch to limit the displacement, improve the bearing performance of steel arch, and restrict the ground deformation during tunnelling. At present, studies on the design parameter optimization of feet-lock pipes in small-space tunnel are still in a lack, which impedes the application of this technology. In this study, based on a small-space tunnel project in Suzhou, China, the plane strain finite element analysis within the jointed rock constitutive model is conducted to investigate the optimum designs of inserting angle, length, and diameter of feet-lock pipes. Results show that the inserting angle has a significant influence on the supporting efficiency, and an optimal angle of 60° is recommended. The increase of pipe length can lead to the rise of the disturbed zone in the surrounding rock, and the design length is suggested to be below 4.5 m. The pipe diameter has limited influence on the reinforcement effect of tunnels.
Experimental Study on Chloride Penetration Resistance of Ultra High Performance Concrete for Electric Pole
Authors: Li Chu , Wang Yuwei
Published: September 2023

In recent years, with the continuous development of ultra high strength concrete, more and more attention is paid to bridge and power transmission industry. According to the long-term testing experience and research results of concrete poles, the China Electric Power Research Institute believes that the use of ultra-high strength concrete poles can make the poles lighter, and the use of ultra-high strength concrete poles can replace the ordinary concrete poles with large bending moment, and has the corrosion resistance such as salt and alkali resistance, so it is the replacement product of traditional cement poles. Chloride penetration resistance is an important index to measure the durability of concrete. This paper describes the model making of C100 ultra high performance concrete pole, and takes the same curing ultra high performance concrete pattern as the research object to carry out the chloride ion penetration resistance test. It is concluded that the concrete specimens cured at the same time of ultrahigh performance concrete pole have very excellent chloride ion penetration resistance, which can ensure the normal use of ultrahigh performance concrete pole during the design service life.
Study on Properties of Asphalt Mixture with Rice Straw Fiber
Authors: Shan Rui , Liu Linlin
Published: September 2023

To solve the problem of asphalt pavement cracks and save non-renewable resources, RSF were selected as reinforcements, and silane coupling agents were used to modify RSF surface to study the impact of RSF on the road performance of AM. The results indicate that RSF can improve the high-temperature stability and low-temperature cracking resistance of AM, increasing by 19.9% and 4.9% respectively; Compared with the original RSF, the high-temperature rutting resistance and low-temperature cracking resistance of modified RSF for AM are improved by 2.9% and 1.1%, respectively. The splitting strength of the modified RSF AM is 3.6% and 0.9% higher than that of the original AM with RSF and the non-fiber AM, respectively. The modified RSF can delay the aging of asphalt and improve the aging resistance of the AM.
Study on the Preparation and Properties of Glass Powder Autoclaved Aerated Concrete
Authors: Wen Bo , Wang Xuefeng
Published: September 2023

Using waste glass instead of quartz sand as silicon raw material preparation of autoclaved aerated concrete, research under different glass powder autoclaved aerated concrete performance evolution law, by scanning electron microscope analysis of glass, using orthogonal test of glass autoclaved aerated concrete ratio optimization design, analysis of glass powder, quartz sand dosage, cement dosage, gypsum dosage, water ratio of autoclaved aerated concrete performance. The results show that with the increase of the substitution rate of glass powder, the dry density of autoclaved aerated concrete is increasing, and the compressive strength can improve the crystallinity of the compounds in the autoclaved aerated concrete. When the substitution rate of glass powder is 60%, the compressive strength of the autoclaved aerated concrete is maximum, and the optimal mix ratio of the autoclaved aerated concrete meets the requirements of specification A5.0 B07 strength grade.
Experimental Study on the Bearing Behaviour of Super-Long Post-Gouting Cast-in-Place Pile in Deep Soft Soil
Authors: Su Shiding , Wang Xing , Lv Shuhui
Published: September 2023

The post-grouting technology is widely employed in cast-in-place pile, but also a lack of awareness of the effect of post-grouting on super long cast-in-place pile in deep soft soil. To discover the mechanical mechanism of post-grouting cast-in-place pile in deep soft soil, O-cell pile testing before and after post grouting are carried out on two piles instrumented with steel-string transducer, and the frictional resistance and tip resistance are obtained. The following conclusion can be reached: 1) Side grouting and end-side association grouting can significantly increase the axial bearing capacity and the axial displacement decreases significantly at the same load. 2) The unit side resistance of pile is increased by using post-grouting and the effect on coarse-grained soil is better than that on fine-grained soil. 3) The load transfer law of overlength cast-in-place pile will not be changed by post-grouting, and the load-settlement curve will be slow descending. In order to increase the pile bearing capacity and reduce settlement simultaneously, side grouting can be the recommendation for super-long cast-in-place pile in deep soft soil.
Numerical Simulation of Dam Failure Process Based on Flow-3D
Authors: Peng Chen , Gu Liuweikai , Zhong Qiming
Published: September 2023

The process of a dam breach is very complex, and the resulting flood can pose a great threat to the personal and property safety of downstream residents. By using numerical analysis to simulate and analyze the sensitivity of parameters in the breach process of a large dam, it is of great significance for the formulation of emergency plans and rescue plans downstream of the dammed lake. Taking the Tangjiashan landslide dammed lake as an example, a three-dimensional numerical model of the Tangjiashan landslide dam was established based on the elevation data obtained from satellite remote sensing measurements using Autodesk Civil3D software. The Flow-3D software was used to simulate the dam breach process, and the rationality of the model was verified by comparing it with the measured breach flow rate on site.The sensitivity analysis of parameters showed that the initial breach water level had a significant impact on the breach process. Excavating the spillway channel can effectively lower the water level in the dammed lake during the breach, thereby reducing the peak flow rate of the breach and is an effective solution to control hazard losses.
Analysis of Influence of Large Diameter Shield Tunnel Construction on Levee
Authors: Sun Xiaobo , Shou Lingchao , Pang Jin , Zhang Hengxu
Published: September 2023

The paper takes Genshan Road crossing River tunnel as the research object and analyzes the measured data of surface settlement when the shield tunnel passes through the levee. The results show: the ratio of the settlement value to the total settlement is relatively large in the two stages of the passage of the shield and after the passage of the shield, which is 44.5% and 25.5%, respectively. The influence range of shield tunnel construction on levee settlement is 2.3D (D is the tunnel diameter of 14.5 m).
Characteristics and Disaster-Causing Mechanism Analysis of Large Variable Section Tunnel
Authors: Zheng Qiqi , Li Chuanlin , Yan Xinyu
Published: September 2023

Under the condition of large-span variable section, tunnel excavation is easy to cause large structural deformation. the deformation and stress change of tunnel construction under different variable sections are summarized, the disaster-causing mechanism of tunnel are analyzed. The variable section significantly increases the deformation of the nearby rock at the vault and side wall, and the stress change of the rock at the arch foot is obvious. Compared with the radial deformation, the vertical deformation of tunnel on the continuous variable section excavation is larger. When the small section turns to the large section, the deformation is larger than the large section, and the research results can provide a reference for the design and construction of similar tunnel group.
Strategies for Talent Development in International Collaboration Insights from Chinese Universities and Global Institutions
Authors: Hu Ming
Published: September 2023

With China's continuous rise in comprehensive national strength and rapid economic development, international cooperation and exchange in Chinese universities have garnered increasing attention. This paper analyzes the current status of undergraduate talent development through international cooperation in Chinese ethnic universities. Based on summarizing the characteristics of talent development in international cooperation, it explores the development trends and challenges in international talent cooperation and provides some recommendations for further development.