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    Wyświetlanie 1-13 z 13
    Tytuł:
    A Systematic Reuse Process for Automated Acceptance Tests: Construction and Elementary Evaluation
    Autorzy:
    Irshad, Mohsin
    Petersen, Kai
    Powiązania:
    https://bibliotekanauki.pl/articles/2060903.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    software component
    software reuse
    software testing
    analysis
    verification
    agile software development methodology
    agile software development practice
    software quality
    Opis:
    Context: Automated acceptance testing validates a product’s functionality from the customer’s perspective. Text-based automated acceptance tests (AATs) have gained popularity because they link requirements and testing. Objective: To propose and evaluate a cost-effective systematic reuse process for automated acceptance tests. Method: A systematic approach, method engineering, is used to construct a systematic reuse process for automated acceptance tests. The techniques to support searching, assessing, adapting the reusable tests are proposed and evaluated. The constructed process is evaluated using (i) qualitative feedback from software practitioners and (ii) a demonstration of the process in an industry setting. The process was evaluated for three constraints: performance expectancy, effort expectancy, and facilitating conditions. Results: The process consists of eleven activities that support development for reuse, development with reuse, and assessment of the costs and benefits of reuse. During the evaluation, practitioners found the process a useful method to support reuse. In the industrial demonstration, it was noted that the activities in the solution helped in developing an automated acceptance test with reuse faster than creating a test from scratch i.e., searching, assessment and adaptation parts. Conclusion: The process is found to be useful and relevant to the industry during the preliminary investigation.
    Źródło:
    e-Informatica Software Engineering Journal; 2021, 15, 1; 133--162
    1897-7979
    Pojawia się w:
    e-Informatica Software Engineering Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical design of a short-wave infrared coded aperture snapshot spectral imager based on Offner–Wynne imaging spectrometer
    Autorzy:
    Song, Chong
    Zhou, Liang
    Liu, Zhaohui
    Jiang, Kai
    Liu, Kai
    Powiązania:
    https://bibliotekanauki.pl/articles/2086755.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Offner-Wynne imaging spectrometer
    CASSI
    coded aperture snapshot spectral imager
    short-wave infrared
    optical design
    Opis:
    A calculation model to obtain the optimal combination of Offner–Wynne imaging spectrometer parameters to balance the RMS spot radius of the chief ray over the entire field is established. On the basis of the calculation model, an Offner–Wynne imaging spectrometer is designed, and then it is applied in a short-wave infrared coded aperture snapshot spectral imager (CASSI). The optical system of the short-wave infrared CASSI is designed by a combination method of independent design and integrated optimization. The spectral smile and spectral keystone of the optical system which operates in the 900–1700 nm band are respectively less than half a pixel. The focal length of the optical system is 1200 mm, the total optical system length is 775mm, and its average spectral resolution is 16 nm. The optical system offers the advantages of excellent imaging quality, compact optical structure, high optical transmittance, reduced spectral smile and spectral keystone.
    Źródło:
    Optica Applicata; 2022, 52, 2; 143--161
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Review of Methods and Challenges for Improvement in Efficiency and Distance for Wireless Power Transfer Applications
    Autorzy:
    Kuka, Sokol
    Ni, Kai
    Alkahtani, Mohammed
    Powiązania:
    https://bibliotekanauki.pl/articles/1193899.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    wireless power transfer
    inductive power transfer technique
    efficiency
    distance
    safety
    security
    Opis:
    Over the past few years, interest and research in wireless power transfer (WPT) have been rapidly incrementing, and as an effect, this is a remarkable technology in many electronic devices, electric vehicles and medical devices. However, most of the applications have been limited to very close distances because of efficiency concerns. Even though the inductive power transfer technique is becoming relatively mature, it has not shown near-field results more than a few metres away transmission. This review is focused on two fundamental aspects: the power efficiency and the transmission distance in WPT systems. Introducing the principles and the boundaries, scientific articles will be reviewed and discussed in terms of their methods and respective challenges. This paper also shows more important results in efficiency and distance obtained, clearly explaining the theory behind and obstacles to overcome. Furthermore, an overlook in other aspects and the latest research studies for this technology will be given. Moreover, new issues have been raised including safety and security.
    Źródło:
    Power Electronics and Drives; 2020, 5, 40; 1-25
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation of polymeric ferric sulfate–quaternary ammonium cationic modified starch composite flocculant and its application in oily sludge treatment
    Autorzy:
    Yu, Lanlan
    Liu, Peng
    Zheng, Kai
    Powiązania:
    https://bibliotekanauki.pl/articles/2171845.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    oily sediment
    flocculant
    petroleum
    ferrum sulfate
    osad oleisty
    flokulant
    ropa naftowa
    siarczan żelazowy
    Opis:
    Inorganic-organic compound flocculant of PFS-quaternary ammonium cation-modified starch composite flocculant was prepared by etherification and compounding method, with corn starch, sodium hydroxide (NaOH), cationic etherifying agent 3-chloro-2-hydroxypropyl trimethyl ammonium chloride (CHPTMA), polymeric ferric sulfate (PFS) as raw materials. The best preparation conditions were the rate of PFS and quaternary ammonium cation-modified starch mass 4:1, pH of the solution 2, temperature 60 ℃, and the reaction time of 4 h. The factors were ranked according to the influence degree as follows: mass ratio > reaction time > pH > temperature. The flocculant prepared under optimal preparation conditions was applied to the treatment of oily sludge in the oil field. When pH of the oily sludge–flocculant mixture was 7 and the dosage at 110 mg/dm3, the deoiling rate of the oily sludge reached 82.25%, which was an effective conditioning flocculant for oily sludge. SEM analysis showed that the mechanisms of flocculant were mainly net catching and adsorption bridging action. Thermo-gravimetry (TG) and energy dispersive spectroscopy (EDS) analyses showed that crude oil and bound water were removed by the composite flocculant.
    Źródło:
    Environment Protection Engineering; 2022, 48, 4; 35--49
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bidirectional DC–AC Converter-Based Communication Solution for Microgrid
    Autorzy:
    Zhang, Yixuan
    Ni, Kai
    Wang, Yangang
    Hu, Yihua
    Powiązania:
    https://bibliotekanauki.pl/articles/1193849.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    bidirectional DC-AC converter
    frequency shift keying
    MATLAB simulation
    microgrid
    two-way communication
    Opis:
    The communication system of a microgrid can transfer the information of electricity price, power consumption and so on between users and the control centre. This capability is of great significance to improve the efficiency and sustainability of power facilities. In this paper, a bidirectional DC–AC converter topology is proposed to achieve the composite transmission of power and signals in microgrids. Since the transmitted signals are modulated by power switches of converters and integrated into the currents, the cost of signal couplers can be saved and the circuit structure can be simplified. In order to verify the feasibility of the proposed method, a simulation model of the proposed converter is implemented in MATLAB/Simulink. With the power supply frequency of 50 Hz, when the converter operates in the inverter mode and rectifier mode, the data transmission rate can reach 120 bit/s and 48 bit/s, respectively.
    Źródło:
    Power Electronics and Drives; 2020, 5, 40; 177-188
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Usage, Retention, and Abandonment of Agile Practices: A Survey and Interviews Results
    Autorzy:
    Nurdiani, Indira
    Börstler, Jürgen
    Fricker, Samuel
    Petersen, Kai
    Powiązania:
    https://bibliotekanauki.pl/articles/384126.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Agile practices
    Agile maturity models
    survey
    Opis:
    Background: A number of Agile maturity models (AMMs) have been proposed to guide software organizations in their adoption of Agile practices. Typically the AMMs suggest that higher maturity levels are reached by gradually adding more practices. However, recent research indicates that certain Agile practices, like test-driven development and continuous integration, are being abandoned. Little is known on the rationales for abandoning Agile practices. Aim: We aim to identify which Agile practices are abandoned in industry, as well as the reasons for abandoning them. Method: We conducted a web survey with 51 respondents and interviews with 11 industry practitioners with experience in Agile adoption to investigate why Agile practices are abandoned. Results: Of the 17 Agile practices that were included in the survey, all have been abandoned at some point. Nevertheless, respondents who retained all practices as well as those who abandoned one or more practices, perceived their overall adoption of Agile practices as successful. Conclusion: Going against the suggestions of the AMMs, i.e. abandoning Agile one or more practices, could still lead to successful outcomes. This finding indicates that introducing Agile practices gradually in a certain order, as the AMMs suggest, may not always be suitable in different contexts.
    Źródło:
    e-Informatica Software Engineering Journal; 2019, 13, 1; 7-35
    1897-7979
    Pojawia się w:
    e-Informatica Software Engineering Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Value-based Software Engineering: A Systematic Mapping Study
    Autorzy:
    Salleh, Norsaremah
    Mendes, Emilia
    Mendes, Fabiana
    Lekamlage, Charitha Dissanayake
    Petersen, Kai
    Powiązania:
    https://bibliotekanauki.pl/articles/9738795.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    systematic mapping
    value-based software engineering
    VBSE
    Opis:
    Background: Integrating value-oriented perspectives into the principles and practices of software engineering is fundamental to ensure that software development activities address key stakeholders’ views and also balance short-and long-term goals. This is put forward in the discipline of value-based software engineering (VBSE) Aim: This study aims to provide an overview of VBSE with respect to the research efforts that have been put into VBSE. Method: We conducted a systematic mapping study to classify evidence on value definitions, studies’ quality, VBSE principles and practices, research topics, methods, types, contribution facets, and publication venues. Results: From 143 studies we found that the term “value” has not been clearly defined in many studies. VB Requirements Engineering and VB Planning and Control were the two principles mostly investigated, whereas VB Risk Management and VB People Management were the least researched. Most studies showed very good reporting and relevance quality, acceptable credibility, but poor in rigour. Main research topic was Software Requirements and case study research was the method used the most. The majority of studies contribute towards methods and processes, while very few studies have proposed metrics and tools.Conclusion: We highlighted the research gaps and implications for research and practice to support VBSE.
    Źródło:
    e-Informatica Software Engineering Journal; 2023, 17, 1; 230106
    1897-7979
    Pojawia się w:
    e-Informatica Software Engineering Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Attapulgite suspension filter material for biological aerated filter to remove CODMn and ammonia nitrogen in micropolluted drinking water source
    Autorzy:
    Xu, Kai
    Wang, Jiahao
    Li, Jiacheng
    Wang, Zijie
    Lin, Zizeng
    Wang, Zheng
    Powiązania:
    https://bibliotekanauki.pl/articles/2032905.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    drinking water
    biofiltration
    BAF
    biological aerated filter
    COVID-19
    removal of ammonia
    human stool
    woda pitna
    biofiltracja
    biologiczny filtr napowietrzny
    usuwanie amoniaku
    kał ludzki
    Opis:
    An attapulgite suspended (AS) filter material was successfully prepared and used in combination with biological aerated filter (BAF) to pretreat excess organic matter and ammonia nitrogen in micropolluted water. The AS filter material was of low density and floated on the water surface, which is beneficial to optimize the hydraulic conditions. Through scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) It was found that the surface of the filter material was uneven, the pores were deep. When the hydraulic load is 4 m/h and the gas to water volume ratio is 2:1, the removal rates of permanganate index (CODMn) and ammonia nitrogen by ASBAF are up to 57.49 and 88.11%, respectively, and the effluent quality meets relevant standards. After backwashing, the pollutants removal rate will return to stable filtration after two hours. A short-term shutdown of the reactor has little effect on the processing performance of ASBAF, but a long-term shutdown will greatly affect the removal rate of CODMn. The complete organic matter degradation model can well fit the experimental effluent water quality.
    Źródło:
    Environment Protection Engineering; 2020, 46, 4; 21-40
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of middle ear disorder in round-window stimulation using a finite element human ear model
    Autorzy:
    Zhou, Kai
    Liu, Houguang
    Yang, Jianhua
    Zhao, Yu
    Rao, Zhushi
    Yang, Shanguo
    Powiązania:
    https://bibliotekanauki.pl/articles/307472.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    implant
    symulacja
    FEM
    middle ear implant
    round-window stimulation otosclerosis
    otitis media
    hearing loss
    finite-element analysis
    Opis:
    The aim of this work was to study the effect of middle ear disorder on round window (RW) stimulation, so as to provide references for the optimal design of RW stimulation type middle ear implants (MEIs). Methods: A human ear finite-element model was built by reverse engineering technique based on micro-computed tomography scanning images of human temporal bone, and was validated by three sets of comparisons with experimental data. Then, based on this model, typical disorders in otosclerosis and otitis media were simulated. Finally, their influences on the RW stimulation were analyzed by comparison of the displacements of the basilar membrane. Results: For the otosclerosis, the stapedial abnormal bone growth severely deteriorated the equivalent sound pressure of the RW stimulation at higher frequencies, while the hardening of ligaments and tendons prominently decreased the RW stimulation at lower frequencies. Besides, among the hardening of the studied tissues, the influence of the stapedial annular ligament’s hardening was much more significant. For the otitis media, the round window membrane (RWM)’s thickening mainly decreased the RW stimulation’s performance at lower frequencies. When the elastic modulus’ reduction of the RWM was considered at the same time especially for the acute otitis media, it would raise the lower-frequency performance of the RW stimulation. Conclusions: The influence of the middle ear disorder on the RW stimulation is considerable and variable, it should be considered during the design of the RW stimulation type MEIs.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2019, 21, 1; 3-12
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A novel process for extraction of iron from a refractory red mud
    Autorzy:
    Ding, Wei
    Xiao, Junhui
    Peng, Yang
    Shen, Siyue
    Chen, Tao
    Zou, Kai
    Wang, Zhen
    Powiązania:
    https://bibliotekanauki.pl/articles/1450194.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    red mud
    sodium sulfate
    segregation roasting
    magnetic separation
    iron recovery
    Opis:
    Red mud is a kind of solid waste produced during alumina extraction from bauxite. To extraction valuable iron from red mud, the technology of adding sodium sulfate-segregation roasting-magnetic separation to treat red mud was developed. During the paper, the effects of various process parameters on the extraction of iron by segregation roasting-magnetic separation were studied, and the phase transformation behavior and microstructure of iron are explored. Repeated test results showed that magnetic concentrate (mass percent), TFe of 80.29 % and overall iron recovery of 92.08 %was obtained. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) results indicated that after the segregation roasting, the hematite was transformed into a new metal phase consisting mainly of metallic iron and magnetite. The addition of sodium sulfate during the segregation roasting can obviously improve the efficiency of segregation roasting-magnetic separation for iron extraction.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 6; 125-136
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study on the effect of ions on the surface hydration characteristics of fine quartz
    Autorzy:
    Liu, Chunfu
    Min, Fanfei
    Liu, Lingyun
    Chen, Jun
    Ren, Bao
    Lv, Kai
    Tan, Yujiao
    Powiązania:
    https://bibliotekanauki.pl/articles/2146921.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    quartz
    hydration cation
    particle sphericity
    hydration factor
    viscosity
    Opis:
    The fine quartz particle hydration and effects of metal ions on the hydration characteristics of fine quartz surface are investigated using the rheological experiment. Several important factors affecting hydration factors, such as particle sphericity, solution pH, ion species, ion concentration were investigated. The results show that viscosity and hydration factor of fine quartz suspension increase with the increase of solution pH. wherein quartz particles have more negative charges on the surface in alkaline environment and strong hydration repulsion; The introduction of metal ions enhances the hydration strength of fine quartz surface to a certain extent. In contrast, high valence and high concentration will increase the viscosity of fine quartz suspension, and the hydration factors of particle surface also increase. At the same ion concentration, the order of influence on the hydration factors of fine quartz particles is Mg2+ > Ca2+ > Na+ > K+. This finding has been attributed to the combination of metal ion hydration and its adsorption on the mineral surface. This study will provide the theoretical guiding significance for the refractory coal slime water and other mineral processing wastewater containing quartz particles.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 4; art. no. 150280
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kinetics of simultaneous recovering of Au and Ag from CTs by chloridizing volatilization methods
    Autorzy:
    Weiwei, Wang
    Zhengyao, Li
    Shanshan, Yang
    Kai, Ma
    Xin, Gao
    Shaoqi, Han
    Shaochun, Hou
    Hecheng, Miao
    Powiązania:
    https://bibliotekanauki.pl/articles/27323663.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    cyanide tailings
    chloridizing volatilization
    gold
    silver
    kinetics
    Opis:
    Cyanide Tailings (CTs) are known as hazardous resources that accumulate hundreds of millions of tons, threatening the ecological environment. This work proposes an eco-friendly and efficient way to recover gold and silver from CTs. The effects of calcium chloride dosage, silicon dioxide dosage, pellet moisture content, roasting temperature, and roasting time on Au and Ag chloridizing volatilization were studied. The kinetics of simultaneously recovering of gold and silver from cyanide Tailings by chlorination roasting was investigated. It was determined that the chloridizing volatilization rates increased with increasing calcium chloride dosage, temperature and decreasing silicon dioxide dosage, pellet moisture content. The chloridizing volatilization kinetics followed a shrinking core model, with inter-diffusion through gangue layer as the rate determining step. This finding is in accordance with the apparent activation energy (Ea) of 24.01 kJ•mol-1 (Au) and 24.62 kJ•mol-1 (Ag). The orders of reaction with respect to moisture content, temperature, calcium chloride dosage and silicon dioxide dosage were also achieved. The rate of reaction based on diffusion-controlled process can be expressed by semi-empirical equations. The control steps of the gold and silver recovery process were investigated by the kinetic study, which provided theoretical guidance for the optimization of the method.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 172522
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Governance in Ethical and Trustworthy AI Systems: Extension of the ECCOLA Method for AI Ethics Governance Using GARP
    Autorzy:
    Agbese, Mamia
    Alanen, Hanna-Kaisa
    Antikainen, Jani
    Erika, Halme
    Isomaki, Hannakaisa
    Jantunen, Marianna
    Kemell, Kai-Kristian
    Rousi, Rebekah
    Vainio-Pekka, Heidi
    Vakkuri, Ville
    Powiązania:
    https://bibliotekanauki.pl/articles/2203948.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    AI
    artificial intelligence
    AI ethics
    trustworthy AI
    AI governance
    adaptive governance
    ECCOLA
    Opis:
    Background: The continuous development of artificial intelligence (AI) and increasing rate of adoption by software startups calls for governance measures to be implemented at the design and development stages to help mitigate AI governance concerns. Most AI ethical design and development tools mainly rely on AI ethics principles as the primary governance and regulatory instrument for developing ethical AI that inform AI governance. However, AI ethics principles have been identified as insufficient for AI governance due to lack of information robustness, requiring the need for additional governance measures. Adaptive governance has been proposed to combine established governance practices with AI ethics principles for improved information and subsequent AI governance. Our study explores adaptive governance as a means to improve information robustness of AI ethical design and development tools. We combine information governance practices with AI ethics principles using ECCOLA, a tool for ethical AI software development at the early developmental stages. Aim: How can ECCOLA improve its robustness by adapting it with GARP® IG practices? Methods: We use ECCOLA as a case study and critically analyze its AI ethics principles with information governance practices of the Generally Accepted Recordkeeping principles (GARP®). Results: We found that ECCOLA’s robustness can be improved by adapting it with Information governance practices of retention and disposal. Conclusions: We propose an extension of ECCOLA by a new governance theme and card, # 21.
    Źródło:
    e-Informatica Software Engineering Journal; 2023, 17, 1; art. no. 230101
    1897-7979
    Pojawia się w:
    e-Informatica Software Engineering Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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