6,016 results on '"Join (sigma algebra)"'
Search Results
2. Optimal Management of Evolving Hierarchies
- Author
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Jens Leth Hougaard, Lars Peter Østerdal, and Juan D. Moreno-Ternero
- Subjects
Hierarchy ,Computer science ,Strategy and Management ,Management Science and Operations Research ,Optimal allocation schemes ,Optimal management ,Nash equilibrium ,Microeconomics ,symbols.namesake ,Blockchain ,Hierachies ,Multi-level marketing ,symbols ,Join (sigma algebra) ,Revenue - Abstract
We study the optimal management of evolving hierarchies of revenue-generating agents. The initiator invests into expanding the hierarchy by adding another agent, who will bring revenues to the joint venture and who will invest herself into expanding the hierarchy further, and so on. The higher the investments (which are private information), the higher the probability of expanding the hierarchy. An allocation scheme specifies how revenues are distributed, as the hierarchy evolves. We obtain schemes that are socially optimal and initiator-optimal, respectively. Our results have potential applications for blockchain, cryptocurrencies, social mobilization, and multilevel marketing. This paper was accepted by Manel Baucells, behavioral economics and decision analysis.
- Published
- 2022
3. Security of Multi-Adjustable Join Schemes: Separations and Implications
- Author
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Shahram Khazaei and Mojtaba Rafiee
- Subjects
Computer science ,business.industry ,Join (sigma algebra) ,Electrical and Electronic Engineering ,business ,Computer network - Published
- 2022
4. Measuring platform return on participation
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Llewellyn D. W. Thomas, Rashik Parmar, and Zoë Clements
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Marketing ,Attractiveness ,Variable (computer science) ,0502 economics and business ,05 social sciences ,Join (sigma algebra) ,050211 marketing ,Digital economy ,Business ,Business and International Management ,Fixed cost ,050203 business & management ,Industrial organization - Abstract
While industry platforms can transform industries and drive the digital economy, there is little guidance for managers to help them decide which industry platform to join. Derived from industry research, we propose a six-step Return on Participation (ROP) method that enables managers to clearly and logically review how their firms are impacted by a platform, what the benefits are, how current and future variable and fixed costs vary, as well as the often-hidden joining costs. We suggest this technique could be also used by managers to compare competing platforms and by platform owners to evaluate the attractiveness of their offerings.
- Published
- 2022
5. Participation and Degrees
- Author
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Jan Willem Wieland, Moral and Political Philosophy, and CLUE+
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Philosophy ,Corona (optical phenomenon) ,SDG 16 - Peace ,Sociology and Political Science ,Expression (architecture) ,Political science ,Perspective (graphical) ,SDG 16 - Peace, Justice and Strong Institutions ,Join (sigma algebra) ,Justice and Strong Institutions ,Law and economics - Abstract
What's wrong with joining corona parties? In this article, I defend the idea that reasons to avoid such parties (or collective harms, more generally) come in degrees. I approach this issue from a participation-based perspective. Specifically, I argue that the more people are already joining the party, and the more likely it is that the virus will spread among everyone, the stronger the participation-based reason not to join. In defense of these degrees, I argue that they covary with the expression of certain attitudes.
- Published
- 2022
6. Multifaceted effects of globalisation on welfare attitudes
- Author
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Sijeong Lim and Seiki Tanaka
- Subjects
media_common.quotation_subject ,05 social sciences ,Welfare state ,Management, Monitoring, Policy and Law ,Economic globalization ,0506 political science ,Globalization ,Political economy ,0502 economics and business ,Political Science and International Relations ,050602 political science & public administration ,Economics ,Join (sigma algebra) ,050207 economics ,Welfare ,media_common - Abstract
How does economic globalisation influence individuals’ welfare state preferences? Moving beyond the unidimensional understanding of globalisation exposure, we intersect two dimensions of exposure perceptions (gain vs loss and individual vs societal impacts) and propose a novel typology: collective winner, lone winner, lone loser and collective loser. We then explain the preference gap among losers (collective losers vis-à-vis lone losers) and among winners (collective winners vis-à-vis lone winners) by considering three distinct motivations for welfare state support: compensation, risk-pooling and inequality reduction. We illustrate the usefulness of our typology using an original survey in South Korea. We find that lone winners are far more supportive of welfare spending than collective winners. At the same time, collective losers are found to be much more supportive of welfare spending than lone losers. We provide some first-cut evidence that the insurance-seeking motivation common to lone winners and collective losers drive their welfare state support.
- Published
- 2022
7. Cost-effective crowdsourced join queries for entity resolution without prior knowledge
- Author
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Weilong Zeng, Bo Yin, and Xuetao Wei
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Scheme (programming language) ,Matching (statistics) ,Transitive relation ,Theoretical computer science ,Computer Networks and Communications ,Computer science ,business.industry ,Aggregate (data warehouse) ,Crowdsourcing ,Object (computer science) ,Set (abstract data type) ,Hardware and Architecture ,Join (sigma algebra) ,business ,computer ,Software ,computer.programming_language - Abstract
The join query, which finds matching pairs from two object sets, is a fundamental operation in computer systems and helps to solve many real problems, e.g., entity resolution. In this paper, we address the problem of join queries by leveraging crowdsourcing to obtain matching relationships. The goal is to minimize the monetary cost while maintaining high quality of query results. However, existing approaches focused on finding matching pairs from a single object set and assumed the existence of prior knowledge, which is not applicable in real applications. We propose a cost-effective crowdsourced join query framework that minimizes the overall monetary cost by reducing the monetary cost of labeling single pairs and the amount of comparison pairs. Specifically, we first propose a novel two-level confidence-based labeling model that minimizes the cost for labeling a single pair with confidence guarantee. This model crowdsources easy-judging pairs to ordinary workers, and asks for skilled workers who may charge more than ordinary workers to compare only hard-judging pairs. Statistical estimations are used to aggregate crowdsourcing results with 1 − α confidence. Then, we propose a transitivity-based query scheme that minimizes the number of comparison pairs on the basis of transitive relations. Guided by the principle of eagerly identifying matching pairs, especially matching pairs from a single set, our scheme carefully designs the processing order of pairs in order to make full use of transitivities to infer new labels. The results of our extensive experiments demonstrate that the proposed framework can save much more monetary cost while assuring the accuracy of results.
- Published
- 2022
8. Upset Protrusion Joining (UPJ) characteristics of cast AM60 magnesium alloy to join with dissimilar material
- Author
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Nicholas Andreae, Mukesh K. Jain, and Dharmendra Chalasani
- Subjects
Materials science ,Control and Systems Engineering ,Mechanical Engineering ,Metallurgy ,Join (sigma algebra) ,Magnesium alloy ,Upset ,Industrial and Manufacturing Engineering ,Software ,Computer Science Applications - Abstract
Magnesium alloys have a significant benefit over the steel and aluminum alloys in manufacturing of components for many automotive and structural applications because of their extreme lightweight, low density, and high strength to weight ratio. However, one of the glaring impediments to the success of steels, aluminum, and magnesium-based multi-material integration for automotive industries is the ability to join these materials together without any cracking and corrosive damages during a performance. The present work aims to demonstrate a cost-effective, novel, and versatile joining technique, named Upset Protrusion Joining (UPJ), to mechanically and rapidly (1-2 seconds) join die-cast AM60 alloy to aluminum alloy sheet and evaluate its UPJ characteristics. Cast Mg plate has a cylindrical protrusion (11 mm diameter and 14 mm height) emanated perpendicular to its flat surface, and an aluminum sheet has a hole that accommodates the protrusion. Mg and Al alloy components are then clamped together, electrically heated, and compressed perpendicular to the protrusion axis. During compression, the protrusion expanded circumferentially to fill the hole as well as the region above the hole, and entrapped the Al sheet between the deformed (in a mushroom shape) head and the Mg plate. The effect of different UPJ process parameters such as applied current, current duration, compression loading rate, and compression distance is studied. The process demonstrated repeatability at given process conditions, and optimum process parameters were identified that produce visibly good joints (defect-free) and sufficient joint strengths when tested in the lap-shear mode under uniaxial tension. AM60 alloy showed a great promise as a candidate alloy to suit the UPJ method to adapt to automotive and other industrial manufacturing units to join with dissimilar wrought Al alloy sheets.
- Published
- 2022
9. ISPR Productions vs. Nationalism, Inclination to Join Army and Image Building: Case of Pakistan's Military Operations
- Author
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Amna Ashraf, Muniba Fatima Zahra, and Rubab Musarrat
- Subjects
Political science ,Media studies ,Join (sigma algebra) ,Nationalism ,Image (mathematics) - Abstract
This study targets to investigate the impact of Inter-Services of Public Relations (ISPR) production, broadcasted during the war against terrorism, on Pakistani youth. It is hypothesized that ISPR productions have helped in inflating the motivation level of Pakistani youth, thus helping in promoting the nationalism and positive image of Pakistan. Furthermore, the role of ISPR productions in motivating youth to join Pakistan's Army is also explored. A cross-sectional survey research design was used. The sample of this study was comprised of youth aged between 18 to 24 years, selected through the non-probability purposive sample. The measures comprised of a self-constructed indigenous questionnaire assessing the impact of ISPR productions during a military operation in image building, promotion of nationalism and motivation to join the army. The data analyzed through SPSS Version 22.00 yielded insightful findings. The finding revealed that watching ISPR productions helped in instilling a fervent attitude of Pakistani youth towards nationalism and the Pakistani military. There had been a clearer inclination of youth to aspire for joining the military for upholding the nationalism beliefs, and this finding appears promising, keeping in mind the relative declining opinion that has been observed in youth from the past decade pertaining to nationalism and military operations.
- Published
- 2021
10. Sources of Government Approval During the COVID-19 Pandemic: Threat or Electoral Predispositions?
- Author
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Adrián Pignataro
- Subjects
Government ,Sociology and Political Science ,Coronavirus disease 2019 (COVID-19) ,Political science ,Political Science and International Relations ,Pandemic ,Join (sigma algebra) ,Public administration - Abstract
Rally-round-the-flag events are short-term boosts of government approval during crises, and the COVID-19 pandemic produced such an effect in many countries. But why did some people join the rally while others didn’t? Using public opinion data from Costa Rica, this paper tests two hypotheses: first, that threat increases government approval at the outbreak of the pandemic; second, that electoral predispositions shape approval. Results indicate that COVID-19 contagions, as a measure of the threat, are not associated with approval, while past voting patterns are. Positive assessments of the economy and the relief measures also predict higher support for the government. In brief, Costa Rica's rally-round-the-flag event did not overcome the partisan divisions or the ordinary drivers of approval.
- Published
- 2021
11. DIGDUG: Scalable Separable Dense Graph Pruning and Join Operations in MapReduce
- Author
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Chang-Tien Lu, Pallavi Ramnarain, Manu Shukla, Ray Dos Santos, and Dinesh Dharme
- Subjects
Information Systems and Management ,Dense graph ,Theoretical computer science ,Computer science ,Scalability ,Join (sigma algebra) ,Pruning (decision trees) ,Information Systems ,Separable space - Published
- 2021
12. MapReduce-Based Dynamic Partition Join with Shannon Entropy for Data Skewness
- Author
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Donghua Chen and Runtong Zhang
- Subjects
Measure (data warehouse) ,Theoretical computer science ,Article Subject ,Computer science ,Joins ,Partition (database) ,Computer Science Applications ,QA76.75-76.765 ,Skewness ,Join (sigma algebra) ,In real life ,Entropy (information theory) ,Computer software ,Software ,Data transmission - Abstract
Join operations of data sets play a crucial role in obtaining the relations of massive data in real life. Joining two data sets with MapReduce requires a proper design of the Map and Reduce stages for different scenarios. The factors affecting MapReduce join efficiency include the density of the data sets and data transmission over clusters like Hadoop. This study aims to improve the efficiency of MapReduce join algorithms on Hadoop by leveraging Shannon entropy to measure the information changes of data sets being joined in different MapReduce stages. To reduce the uncertainty of data sets in joins through the network, a novel MapReduce join algorithm with dynamic partition strategies called dynamic partition join (DPJ) is proposed. Leveraging the changes of entropy in the partitions of data sets during the Map and Reduce stages revises the logical partitions by changing the original input of the reduce tasks in the MapReduce jobs. Experimental results indicate that the entropy-based measures can measure entropy changes of join operations. Moreover, the DPJ variant methods achieved lower entropy compared with the existing joins, thereby increasing the feasibility of MapReduce join operations for different scenarios on Hadoop.
- Published
- 2021
13. LET’S JOIN OUR HANDS, MY DEAR FRIENDS: BULAT OKUDZHAVA IN THE INTERTEXTUAL THESAURUS OF THE YOUNG
- Subjects
Thesaurus (information retrieval) ,Join (sigma algebra) ,Sociology ,Linguistics - Abstract
Введение. Рассматривается проблема культурного диалога представителей разных поколений. Прецедентные тексты, связанные с совокупностью знаний и представлений людей, принадлежащих к одной культуре, анализируются в связи со структурой языковой личности. Прецедентные феномены различных типов являются важной составляющей интертекстуального тезауруса. В процессе коммуникации немалую роль играют культурные аллюзии коммуникантов, их оперирование культурным багажом, в частности составляющими интертекстуального тезауруса. Цель – анализ той части тезауруса русской языковой личности, которая связана с крылатыми словами одного из значительных авторов XX века – Булата Окуджавы. Материал и методы. Постоянно воспроизводимые песни Булата Окуджавы формировали культурный код поколения 70–80-х гг. Многие фразы из его песен приобрели статус фольклорных, о чем свидетельствуют материалы словарей и Национального корпуса русского языка. Для исследования динамических процессов, характеризующих различия в культурной памяти поколений отцов и детей, был произведен эксперимент, в ходе которого были отобраны 10 популярных высказываний из поэзии Б. Окуджавы. Они легли в основу опроса, в котором участвовало около 1 000 человек. Респонденты должны были определить авторство высказываний и продолжить некоторые из них. Результаты и обсуждение. Анализ результатов опроса показал, что даже самые распространенные высказывания из песен Б. Окуджавы в большинстве случаев не соотносятся в сознании респондентов с именем автора. Приписывание авторства самым неожиданным именам свидетельствует о глубоких лакунах в культурной памяти молодых людей, в то же время строки Б. Окуджавы присутствуют в интертекстуальном тезаурусе языковой личности, что во многом связано с взаимодействием вербальной и аудиовизуальной информации. Заключение. Результаты анализа лексикографических источников и корпусные данные свидетельствуют о прецедентности многих поэтических строк Б. Окуджавы, в то же время анализ данных массового опроса отражает существенные изменения в интертекстуальном тезаурусе молодежи. Introduction. The article deals with the issue of the cultural communication between representatives of different generations. The precedent texts associated with the common knowledge of people belonging to a single culture are studied in line with the structure of a linguistic personality. Precedent phenomena of various types are an important part of an intertextual thesaurus. In the process of communication, the cultural allusions of communicants play a great role, as well as the application of their cultural backgrounds that include components of the intertextual thesaurus. Aim and objectives. The purpose of the article is to analyze the area of the Russian linguistic personality thesaurus that contains the catchphrases by Bulat Okudzhava – a prominent 20th century Russian author. Material and methods. Being constantly played out in the 1970–1980s, Bulat Okudzhava’s songs were shaping the cultural values of the generation. Many phrases from the songs got a folklore status, which is witnessed both by the dictionaries and by the Russian National Corpus. In order to study the dynamics characterizing the differences in the cultural memory of generations of fathers and sons an experiment has been carried out based on the 10 popular catchphrases from Okudzhava’s verse. These phrases underlie the survey covering an audience of approximately 1,000 people. Those surveyed had to determine the authorship of the phrases and to continue some of them. Results and discussion. The analysis showed that in most cases there are no links in the mind of respondents between the name of Bulat Okudzhava and even the most widespread phrases from his songs. The authorship was often attributed to fully unexpected names, which shows serious gaps in the cultural memory of the young. However, it was proven that Okudzhava’s catchphrases definitely exist in the intertextual thesaurus of the linguistic personality, which is surely determined by the interaction of verbal and multimedia information. Conclusion. The analysis of the dictionary entries and the corpus data proves the precedent status of many of the Okudzhava’s phrases. Nevertheless, the results of the mass survey reflect a significant change in the intertextual thesaurus of the young.
- Published
- 2021
14. On k-Cost Effective Domination Number in the Join of Graphs
- Author
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Rolando N. Paluga, Jesrael Bataluna Palco, and Gina A. Malacas
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Statistics and Probability ,Combinatorics ,Numerical Analysis ,Algebra and Number Theory ,Index (economics) ,Domination analysis ,Applied Mathematics ,Join (sigma algebra) ,Geometry and Topology ,Theoretical Computer Science ,Mathematics - Abstract
In this paper, we characterize the k-cost effective domination in the join of graphs.Further, we investigate the k-cost effective domination, cost effective domination index, maximal cost effective domination in the join of graphs.
- Published
- 2021
15. SISTEM ZA DISTRIBUIRANU DETEKCIJU PLAGIJARIZMA
- Author
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Tamaš Tarjan
- Subjects
business.industry ,Computer science ,Node (networking) ,Service discovery ,Response (communication) ,Join (sigma algebra) ,Plagiarism detection ,Digital document ,business ,Protocol (object-oriented programming) ,Computer network - Abstract
U radu je predstavljen sistem za distribuiranu detekciju plagijarizma. Sistem nudi centralizovani pristup distribuiranim čvorovima koji su prilagođeni protokolu za distribuiranu proveru plagijarizma. U ovom radu je dat opis navedenog protokola. Distribuirani čvorovi imaju mogućnost da se priključe u sistem pomoću registra servisa. Prilikom registracije čvora u sistem, izvršava se osnovna provera poštovanja protokola simulirajući očekivani tok komunikacije između datog čvora i sistema. Svaki čvor ima svoje skladište za digitalne dokumente. Dokumenti nisu deljeni između članova sistema.
- Published
- 2021
16. Shear performance of timber-GFRP double-lap adhesive joints for civil engineering applications
- Author
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Gianluca Chiappini, Placido Munafò, and Francesco Marchione
- Subjects
Shear (sheet metal) ,Materials science ,Adhesive bonding ,Mechanics of Materials ,Materials Chemistry ,Join (sigma algebra) ,Surfaces and Interfaces ,General Chemistry ,Adhesive ,Thermal ageing ,Composite material ,Fibre-reinforced plastic ,Surfaces, Coatings and Films - Abstract
Adhesive bonding technology make it possible to join different materials and to assemble lightweight joints with high mechanical performance. These advantages over conventional technologies have le...
- Published
- 2021
17. ‘I wasn’t allowed to join the boys’: The ideology of cultural cisgenderism in a UK school
- Author
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Christopher John Blackall and Catherine Phipps
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Cultural Studies ,genetic structures ,media_common.quotation_subject ,education ,Join (sigma algebra) ,Gender studies ,sense organs ,Sociology ,Ideology ,Pupil ,Education ,Physical education ,media_common - Abstract
This case-study analyses the experiences of a trans pupil and teacher in a UK-secondary school. It aims to better understand cultural cisgenderism in schools, the acceptance – or lack thereof – of gender expansiveness, and the extent to which school policies are useful to challenge cisnormative gender regimes. Semi-structured interviews were conducted with the trans pupil and teacher and were analysed thematically. Document analysis of the school’s equality and diversity policy was also conducted. Findings revealed that cultural cisgenderism and cisnormativity are embedded into the school culture, with gender structures evident in several areas, leading to trans marginalisation. There was also evidence that both teachers and pupils may contribute to exclusionary and reactive environments, where accommodations are provided only when a trans pupil is visible. This research may be useful for those working in schools to critique policies and practices and create positive change for trans pupils.
- Published
- 2021
18. Survey of Leading Commodities Of Aceh Province As Academic Effort To Join And Build The Country
- Author
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Ichsan Ichsan, Fuadi Fuadi, Munandar Munandar, Mohd. Heikal, Rico Nur Ilham, Chalirafi Chalirafi, Ahmad Fauzul Hakim Hasibuan, Falahuddin Falahuddin, Muammar Khaddafi, and Damanhur Abbas
- Subjects
Economic growth ,Join (sigma algebra) ,Business - Abstract
Local governments must be able to prioritize superior commodities which are considered as the basis for sub-sectors to optimize regional economic advantages. Understanding the priorities of development planning and commodities in the agricultural, plantation and livestock sub-sectors in Aceh Province, it is necessary to know which agricultural, plantation and livestock sub-sectors are the leading and leading commodities in the agricultural, plantation and livestock sectors in Aceh Province. This research for community service was carried out on September 25, 2020 - August 25, 2021 with the location survey method. The criteria used based on this survey are 7 leading commodities in Aceh Province which include red chilies, cayenne peppers, shallots, beef, chicken meat, rice and eggs. The results of this service show that the agriculture and plantation sub-sectors are superior commodities from the period September 2020 - August 2021 with 9 regional locations in Aceh Province. Likewise with the nominated livestock sub-sector as a superior commodity in Aceh Province.
- Published
- 2021
19. DeepMind: From Games to Scientific Discovery
- Author
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Demis Hassabis
- Subjects
ComputingMilieux_GENERAL ,Medal ,Management of Technology and Innovation ,Strategy and Management ,Political science ,Honor ,Scientific discovery ,General Engineering ,Join (sigma algebra) ,ComputingMilieux_MISCELLANEOUS ,GeneralLiterature_MISCELLANEOUS ,Classics ,ComputingMethodologies_COMPUTERGRAPHICS - Abstract
It’s a great honor to be awarded the IRI Medal and to join so many luminaries from the past, some of whom are scientific and innovation heroes of mine.Today I’m going to talk about the potential to...
- Published
- 2021
20. Why Join? How Civil Society Organizations’ Attributes Signal Congruence and Impact Community Engagement
- Author
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Simon Hoellerbauer
- Subjects
Civil society ,Sociology and Political Science ,Community engagement ,business.industry ,Political science ,SIGNAL (programming language) ,Join (sigma algebra) ,Congruence (manifolds) ,Public relations ,business - Abstract
Civil society organizations (CSOs) can facilitate collective action. This makes understanding what shapes whether people are likely to engage with CSOs critically important. This paper argues that whether an organization is perceived as congruent – similar to an individual in values – is a key determinant of whether individuals will engage with it. I use a conjoint survey experiment to test how organizational attributes signaling congruence influence respondents’ willingness to attend a hypothetical organization’s meetings. I find that individuals are more likely to choose organizations that are more likely to be congruent with them, except when it comes to funding. These findings imply that an individual’s level of comfort with a CSO matters for engagement; thus, CSOs need to consider how they match to their publics when reaching out to potential joiners. Furthermore, donors seeking to support CSOs need to pay attention to their impact on perceptions of congruence.
- Published
- 2021
21. Waiting for advice that is beyond doubt: uncertainty as Australia’s reason to join the invasion of Iraq
- Author
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Christiane Gerblinger
- Subjects
History ,Politics ,Law ,Political science ,Political Science and International Relations ,CLARITY ,Join (sigma algebra) ,Advice (programming) ,law.invention ,Theme (narrative) - Abstract
A dominant theme across examinations of the intelligence used to justify invading Iraq in 2003 is that political decision-makers amplified the clarity of their evidence. What has been missed is tha...
- Published
- 2021
22. Spectral analysis and synthesis on an infinite hypergroup join
- Author
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László Székelyhidi
- Subjects
Discrete mathematics ,General Mathematics ,Join (sigma algebra) ,Spectral analysis ,Mathematics - Published
- 2021
23. Shifting Dominant Narratives of Teacher Development: New Directions for Expanding Access to the Educator Workforce Through Grow Your Own Programs
- Author
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Conra D. Gist
- Subjects
business.industry ,media_common.quotation_subject ,Public relations ,Education ,Local community ,Cultural analysis ,Work (electrical) ,Workforce ,Join (sigma algebra) ,Narrative ,Sociology ,business ,Diversity (politics) ,media_common - Abstract
Grow Your Own (GYO) programs are designed to recruit high school students, paraeducators, community organizers and parents, and/or career changers from the local community to join the educator workforce. When considering the nontraditional teacher pools that may enter the profession through GYO programs, commonly held assumptions about who teachers are, how they are developed, and what is most important for supporting their growth are challenged. This article reframes conventional narratives in teacher education by exploring the ways in which GYO programs offer counternarratives that reimagine teacher development by valuing (a) intersectional views of ethnoracial diversity, (b) resilience as an important teacher characteristic, (c) multiple modes of assessment as evidence of teacher learning, (d) ethnoracially diverse and community-based teacher educators, (e) culturally responsive pedagogy and place-based learning, and (f) local community school commitment.
- Published
- 2021
24. How to join hands with invisible people
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Younghoon Jeong
- Subjects
business.industry ,Internet privacy ,Join (sigma algebra) ,Sociology ,business - Published
- 2021
25. SkinnerDB: Regret-bounded Query Evaluation via Reinforcement Learning
- Author
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Junxiong Wang, Joseph Antonakakis, Deepak Maram, Immanuel Trummer, Samuel Moseley, Ziyun Wei, Saehan Jo, and Ankush Rayabhari
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Theoretical computer science ,Computer science ,Preemption ,Benchmark (computing) ,InformationSystems_DATABASEMANAGEMENT ,Reinforcement learning ,Join (sigma algebra) ,Cardinality (SQL statements) ,Tuple ,Data structure ,Query optimization ,Information Systems - Abstract
SkinnerDB uses reinforcement learning for reliable join ordering, exploiting an adaptive processing engine with specialized join algorithms and data structures. It maintains no data statistics and uses no cost or cardinality models. Also, it uses no training workloads nor does it try to link the current query to seemingly similar queries in the past. Instead, it uses reinforcement learning to learn optimal join orders from scratch during the execution of the current query. To that purpose, it divides the execution of a query into many small time slices. Different join orders are tried in different time slices. SkinnerDB merges result tuples generated according to different join orders until a complete query result is obtained. By measuring execution progress per time slice, it identifies promising join orders as execution proceeds. Along with SkinnerDB, we introduce a new quality criterion for query execution strategies. We upper-bound expected execution cost regret, i.e., the expected amount of execution cost wasted due to sub-optimal join order choices. SkinnerDB features multiple execution strategies that are optimized for that criterion. Some of them can be executed on top of existing database systems. For maximal performance, we introduce a customized execution engine, facilitating fast join order switching via specialized multi-way join algorithms and tuple representations. We experimentally compare SkinnerDB’s performance against various baselines, including MonetDB, Postgres, and adaptive processing methods. We consider various benchmarks, including the join order benchmark, TPC-H, and JCC-H, as well as benchmark variants with user-defined functions. Overall, the overheads of reliable join ordering are negligible compared to the performance impact of the occasional, catastrophic join order choice.
- Published
- 2021
26. Joint stiffness identification of industrial serial robots using 3D digital image correlation techniques
- Author
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Yongji Li, Yong Xie, Hu Jiahao, Junying Min, and Jianping Lin
- Subjects
Flexibility (engineering) ,Digital image correlation ,Computer science ,Mechanical Engineering ,Stiffness ,Control engineering ,law.invention ,Identification (information) ,Industrial robot ,law ,Joint stiffness ,medicine ,Join (sigma algebra) ,Robot ,medicine.symptom - Abstract
Industrial robots have been widely used in manufacturing for advantages of flexibility and high efficiency, while there exists a critical problem of low stiffness. Measuring the stiffnesses of joints accurately have a positive effect on optimizing the stiffness through compensation or posture adjustment. This study proposed a new method for stiffness identification of serial industrial robots using 3D digital image correlation (3D-DIC) techniques, which exhibits high accuracies. External forces are applied to the robot end and its 6-dimensional displacements are recorded with a 3D-DIC system. The values of joint stiffness are evaluated from the data of robot configurations, displacements and forces. The proposed method is implemented on the KUKA KR600-2830 robot experimentally and the average absolute value of relative error is 5.8%, which demonstrates that the proposed method provides much improved accuracy compared to the traditional method.
- Published
- 2021
27. Haier: ecosystem leadership
- Author
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Paul J. H. Schoemaker and Jeffrey S. Kuhn
- Subjects
End user ,Innovator ,Multinational corporation ,Strategy and Management ,Join (sigma algebra) ,Ecosystem ,Business ,Marketing - Abstract
Purpose Given their immense value-creating potential, ecosystems?and whether to build, buy, or join one?have become a top agenda item in boardrooms around the world. Design/methodology/approach Haier, a highly successful Chinese multinational corporation has developed an effective set of practices for managing an emergent, ecosystem-based business model. Findings The Haier case illuminates the unique challenges of leading a sprawling, ecosystem-based enterprise that must continually evolve. Practical/implications Haier employees fall into three categories? platform owners, microenterprise owners and entrepreneurs. Originality/value As a strategic innovator, Haier grouped its independent microenterprises into “Ecosystem Micro-Communities” (ECMs) of loosely connected, multi-disciplinary capability clusters organized around end users.
- Published
- 2021
28. Procedures and practices: reflections following 20-years working on a community project in southeast India
- Author
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Peter Winchester
- Subjects
Community project ,Microfinance ,Poverty reduction ,Geography, Planning and Development ,Foundation (evidence) ,Monitoring and evaluation ,Development ,Public administration ,Aid effectiveness ,law.invention ,law ,Political science ,Accountability ,Join (sigma algebra) - Abstract
These notes are aimed at anyone who wants to become or join an NGO in India. They are based on experience working in the Krishna Delta as a UK registered charity: the Divi Seema Foundation (DSF). D...
- Published
- 2021
29. Factors Affecting Farmers Decision to Join Joint Forest Management Programme in Jammu Division of Jammu and Kashmir
- Author
-
Manish Sharma, Tariq Iqbal, P.S. Slathia, Sandeep Sehgal, Kiran Kour, and Rajinder Peshin
- Subjects
Joint Forest Management ,Join (sigma algebra) ,General Medicine ,Business ,Division (mathematics) ,Socioeconomics - Abstract
The present study was conducted in purposively selected “East Forest Circle” of Jammu division of J&K. Multistage sampling plan was followed for the selection of respondents. Six forest ranges from East circle having maximum number of Joint Management Programme (JFM)Cs were selected purposively. Twenty four committees, four from each selected ranges of East circle and eight members from each selected JFMC were selected through random sampling technique. The respondents were divided into two groups 1).Treatment group: Eight members from each selected JFMC were selected randomly for the study making the sample size to 192 respondents. 2). Control group: Two villages from each range (12 villages in total) were selected through random sampling technique. From each selected village nine non- JFMC members were randomly selected. Thus, a total sample of 108 non-JFMC members were selected from these villages. Binary regression model was applied to analyze the factors affecting farmer’s decision to join JFM programme. The result of the study showed that family size, area under trees, extension contact and social participation significantly affecting farmer’s decision to join JFM programme.
- Published
- 2021
30. Naturvitenskapelige praksiser og tenkemåter – på vei mot et tolkningsfellesskap
- Author
-
Merethe Frøyland, Øystein Sørborg, Berit S. Haug, and Sonja M. Mork
- Subjects
Research literature ,Pedagogy ,ComputingMilieux_COMPUTERSANDEDUCATION ,language ,Join (sigma algebra) ,Norwegian ,Sociology ,Set (psychology) ,Curriculum ,language.human_language ,Education - Abstract
Scientific practices are introduced in curricula around the world, replacing the more general concept of inquiry. There are many different definitions of scientific practices, and the purpose of this article is to contribute to a common understanding of what scientific practices are and how they can be implemented and assessed in the classroom. We analyzed the Norwegian curriculum LK20 and found that teachers are mainly left on their own in how to interpret, implement and assess scientific practices. To address the lack of support, we selected a set of central scientific practices based on LK20, the research literature and international curricula and described the practices as explicit and close to teaching practice as possible. Implications for use are discussed, together with a call for other researchers to join the discussion.
- Published
- 2021
31. Does working at a start-up pay off?
- Author
-
Lisa Hölscher, Antje Weyh, Claus Schnabel, and Daniel Fackler
- Subjects
Economics and Econometrics ,Labour economics ,Entrepreneurship ,ddc:330 ,Entropy (information theory) ,Join (sigma algebra) ,Business ,Start up ,General Business, Management and Accounting - Abstract
Using representative linked employer-employee data for Germany, this paper analyzes short- and long-run differences in labor market performance of workers joining start-ups instead of incumbent firms. Applying entropy balancing and following individuals over ten years, we find huge and long-lasting drawbacks from entering a start-up in terms of wages, yearly income, and (un)employment. These disadvantages hold for all groups of workers and types of start-ups analyzed. Although our analysis of different subsequent career paths highlights important heterogeneities, it does not reveal any strategy through which workers joining start-ups can catch up with the income of similar workers entering incumbent firms. Workers do not benefit from entering start-ups. This study analyzes a huge data set for Germany and compares similar workers who either join newly founded firms, so-called start-ups, or incumbent firms. It follows both groups of workers over ten years and finds substantial short- and long-run differences in their labor market performance. Entering a start-up instead of an incumbent firm is associated with huge drawbacks in terms of workers’ wages, yearly income, and employment. These disadvantages exist for various types of workers analyzed and for different types of start-ups. There is no strategy through which workers who join start-ups can catch up with the income of comparable workers who enter mature firms. Thus, the practical implication of this study is that for most workers, it is advisable not to enter start-ups if they have a chance to obtain a decent job in a mature firm.
- Published
- 2021
32. Peer-seating groups and social participation by students with learning disabilities in full-inclusion in Malaysian secondary schools
- Author
-
Hasrul Hosshan, Michelle L. Bonati, Roger J. Stancliffe, and Michelle Villeneuve
- Subjects
Medical education ,Secondary education ,Arts and Humanities (miscellaneous) ,Learning disability ,ComputingMilieux_COMPUTERSANDEDUCATION ,medicine ,Mainstream ,Join (sigma algebra) ,medicine.symptom ,Psychology ,Social engagement ,Education - Abstract
In Malaysian secondary education, typically only academically able students with learning disabilities and acceptable behaviour join mainstream classrooms for full inclusion. Social participation a...
- Published
- 2021
33. 'Little Goodies in His Kit Bag': British Servicemen, Masculinity, and Feeding the Home Front in World War II
- Author
-
Kelly A. Spring
- Subjects
Government ,Ideal (set theory) ,Home front ,Masculinity ,media_common.quotation_subject ,Political science ,World War II ,Media studies ,Join (sigma algebra) ,General Medicine ,media_common - Abstract
In World War II, the British government called on all able-bodied men to join the forces and defend the country, enabling them to fulfill the role of ideal male in wartime. These men also performed...
- Published
- 2021
34. Invite Your Friend and You’ll Move Up in Line: Optimal Design of Referral Priority Programs
- Author
-
Luyi Yang
- Subjects
Scheme (programming language) ,Optimal design ,Operations Research ,Referral ,Operations research ,FIFO (computing and electronics) ,Computer science ,Strategy and Management ,Optimal mechanism ,Throughput ,Management Science and Operations Research ,system throughput ,priority ,0502 economics and business ,referrals ,050207 economics ,computer.programming_language ,Marketing ,Mechanism design ,Queueing theory ,050208 finance ,Referral priority ,Applied Mathematics ,05 social sciences ,Business and Management ,mechanism design ,Incentive ,Waiting list ,customer acquisition ,Jump ,Join (sigma algebra) ,queuing ,Line (text file) ,computer - Abstract
Problem definition : This paper studies the optimal design of referral priority programs, in which customers on a waiting list can jump the line by inviting their friends to also join the waiting list. Academic/practical relevance : Recent years have witnessed a growing presence of referral priority programs as a novel customer-acquisition strategy for firms that maintain a waiting list. Different variations of this scheme are seen in practice, raising the question of what should be the optimal referral priority mechanism. Methodology : I build an analytical model that integrates queuing theory into a mechanism design framework in which the objective of the firm is to maximize the system throughput, that is, accelerate customer acquisition as much as possible. Results : My analysis shows that the optimal mechanism has one of the following structures: full priority; partial priority; first in, first out (FIFO); and strategic delay. A full-priority (partial-priority) scheme enables referring customers to get ahead of all (only some) nonreferring ones. A FIFO scheme does not provide any priority-based referral incentive. A strategic-delay scheme grants full priority to referring customers but artificially inflates the delay of nonreferring ones. I show that FIFO is optimal if either the base-market size or the referral cost is large. Otherwise, partial priority is optimal if the base-market size is above a certain threshold; full priority is optimal at the threshold base-market size; strategic delay is optimal if the base-market size is below the threshold. I also find that referrals motivate the firm to maintain a larger capacity and therefore can surprisingly shorten the average delay, even though more customers sign up and strategic delay is sometimes inserted. Managerial implications : My paper provides prescriptive guidance for launching an optimal referral priority program and rationalizes common referral schemes seen in practice.
- Published
- 2021
35. Complexity of subdivision-vertex and subdivision-edge join graphs
- Author
-
Zeynep Nihan Berberler
- Subjects
Combinatorics ,Vertex (graph theory) ,Algebra and Number Theory ,business.industry ,Applied Mathematics ,Join (sigma algebra) ,Edge (geometry) ,business ,Analysis ,Mathematics ,Subdivision - Abstract
The entropy of a graph is an information-theoretic quantity which expresses the complexity of a graph. The generalized graph entropies result from applying information measures to a graph using various schemes for defining probability distributions over the elements of the graph. In this paper, the first Zagreb index of a class of composite graphs, namely, subdivision-vertex and subdivision-edge join graphs are investigated in order to evaluate the generalized graph entropies, and explicit formulae for the generalized graph entropy of subdivision-vertex and subdivision-edge join graphs are presented.
- Published
- 2022
36. Development of Large-scale Spatio-temporal Data Join Query Processing Algorithm on Spark
- Author
-
Yong-Ki Kim and 전주비전대학교 IT융합시스템과 교수
- Subjects
Development (topology) ,Scale (ratio) ,Computer science ,Spark (mathematics) ,Join (sigma algebra) ,Data mining ,computer.software_genre ,computer ,Temporal database - Published
- 2021
37. Institutional Performance and Party Cues: Their Influence on Individual Geopolitical Preferences. The Case of Moldova (2012-2019)
- Author
-
Ángel Torres-Adán
- Subjects
Sociology and Political Science ,business.industry ,Political science ,Political economy ,Join (sigma algebra) ,media_common.cataloged_instance ,European union ,Public opinion ,business ,Geopolitics ,media_common - Abstract
This paper examines the relationship between institutional trust and party cues, and individual geopolitical preferences in Moldova. Based on the idea that deciding whether to join either the EU or...
- Published
- 2021
38. A CONSPIRACY TO MURDER SENNACHERIB? A REVISION OF SAA 18 100 IN THE LIGHT OF A RECENT JOIN
- Author
-
Luis R. Siddall and Stephanie M. Dalley
- Subjects
media_common.quotation_subject ,Join (sigma algebra) ,Art ,Classics ,media_common - Abstract
SAA 18 100 (ABL 1091) is a cuneiform text that has been at the heart of historical reconstructions of the assassination of the Assyrian king, Sennacherib, since it was first properly studied by S. Parpola in 1979. In 2005, J. C. Fincke discovered a new fragment of the document (28-3-23 [K.21923]) and joined it to the then known fragment (80-7-19, 28). Fincke's join offers the opportunity to study the tablet anew. We present the first full scholarly edition of the fragments and a new historical interpretation of the text that challenges the accepted understanding of its date, nature, content, and the information it provides on the assassination of Sennacherib. SAA 18 100 appears to be an archival copy of a letter originally sent to Nineveh that reported on matters concerning the Assyrian court heard in Babylonia. The best-preserved report concerns a supposed plot looking to frame the king's son, Urdu-Mullissu, in a conspiracy, and might be a product of the pro-Esarhaddon machinations of the royal court during the final years of Sennacherib's reign.
- Published
- 2021
39. Institutional actors’ participation in social movement: examining the roles of perceived damage to work reputation, collective efficacy, and communication patterns
- Author
-
Hans Tse and Macau K. F. Mak
- Subjects
Cultural Studies ,Focus (computing) ,Sociology and Political Science ,business.industry ,media_common.quotation_subject ,Civil service ,Public relations ,Collective efficacy ,Work (electrical) ,Political science ,Join (sigma algebra) ,business ,News media ,Social movement ,Reputation ,media_common - Abstract
Social movement studies often focus on how the general public is mobilized to join collective contentious actions rather than on state-movement relations. Yet, institutional actors who occupy posit...
- Published
- 2021
40. Technological Usability in Mobile Networks: Gratifications and Risks Related to Using Whatsapp
- Author
-
Naiara Silva Ferreira and Emílio José Montero Arruda Filho
- Subjects
Risk perception ,business.industry ,Internet privacy ,Business, Management and Accounting (miscellaneous) ,Join (sigma algebra) ,Usability ,Psychology ,business ,Social tools - Abstract
This study focuses on the preferences that motivate users to join different social networks analyzing the benefits that enhance the acceptance and usability of alternative social tools. WhatsApp wa...
- Published
- 2021
41. ISIS and the Allure of Traditional Gender Roles
- Author
-
Molly Ellenberg and Anne Speckhard
- Subjects
Gender Studies ,Radicalization ,Political science ,Join (sigma algebra) ,Gender studies ,Law - Abstract
As issues of repatriations of ISIS members and their families are hotly debated, exploring the factors that led over 40,000 men and women to leave their home countries to join ISIS is integral to r...
- Published
- 2021
42. Motivations for Queer Women of Color to Join Culturally Based Sororities
- Author
-
Crystal E. Garcia and Antonio Duran
- Subjects
Join (sigma algebra) ,Queer ,Gender studies ,Women of color ,Sociology ,Education ,Narrative inquiry - Abstract
This critical narrative inquiry explored the motivations for Queer Women of Color to join culturally based sororities. Using Munoz’s concept of disidentifications, we found that participants made s...
- Published
- 2021
43. An effectively closed set with no join property*
- Author
-
Ahmet Çevik
- Subjects
Algebra ,Property (philosophy) ,Closed set ,Logic ,Join (sigma algebra) ,Mathematics - Published
- 2021
44. Remark on the spectral synthesis on infinite joins of finite hypergroups
- Author
-
Kedumetse Vati
- Subjects
Mathematics::Functional Analysis ,Pure mathematics ,Spectral theory ,Mathematics::Quantum Algebra ,General Mathematics ,Mathematics::Classical Analysis and ODEs ,Joins ,Join (sigma algebra) ,Spectral analysis ,Commutative property ,Mathematics - Abstract
Spectral theory has become a central area of studies on commutative hypergroups. Spectral analysis and synthesis have been proved for different classes of hypergroups. In their paper (Fechner and Szekelyhidi in Ann Univ Sci Budapest Sect Comput), the authors introduced and studied an infinite join of general finite hypergroups. Here we prove that under some general conditions spectral analysis and synthesis hold on that hypergroup.
- Published
- 2021
45. Cryptocurrencies change everything
- Author
-
Alexander Lipton
- Subjects
ComputingMilieux_GENERAL ,Cryptocurrency ,Commerce ,Emerging technologies ,Join (sigma algebra) ,Business ,New entrants ,General Economics, Econometrics and Finance ,Finance - Abstract
New technologies unleash competitive threats to the incumbents by allowing new entrants to join the party and eventually reshape the entire financial ecosystem
- Published
- 2021
46. Fostering relationships between elementary students and the more-than-human world using movement and stillness
- Author
-
Kathryn Lynch and Sarah Riggs Stapleton
- Subjects
Environmental education ,More than human ,Outdoor education ,business.industry ,Movement (music) ,Join (sigma algebra) ,Sociology ,Public relations ,business ,General Environmental Science ,Education ,Local community - Abstract
We join scholars who criticize the Western separation of humans and the more-than-human (MtH) and believe that an emphasis on the MtH within students’ local community is supported by repeated expos...
- Published
- 2021
47. How Do Individuals Join the Al-Shabaab? An Ethnographic Insight into Recruitment Models for the Al-Shabaab Network in Kenya
- Author
-
Fathima Azmiya Badurdeen
- Subjects
Radicalization ,Political Science and International Relations ,Ethnography ,Terrorism ,Social movement theory ,Join (sigma algebra) ,Sociology ,Criminology ,Safety Research - Abstract
Al-Shabaab employs diverse strategies to recruit and radicalize youth to the network. The Social Movement Theory is used to assess recruitment models for terrorist networks such as the Al-Shabaab. ...
- Published
- 2021
48. High-Parallelism Hash-Merge Architecture for Accelerating Join Operation on FPGA
- Author
-
Wen-Qi Wu, Mei-Ting Xue, Feng Yu, and Qian-Jian Xing
- Subjects
Hash join ,Computer science ,Hash function ,Data_FILES ,Joins ,Join (sigma algebra) ,Linked list ,Parallel computing ,Electrical and Electronic Engineering ,Tuple ,Field-programmable gate array ,Hash table - Abstract
Join is a data-intensive and compute-intensive operation in database systems. As most existing solutions to accelerate the hash join operation on field programmable gate array (FPGA) are focused on N-to-1 join relationships, their performances rapidly decline on N-to-M joins. To resolve this shortcoming, this brief proposes a novel architecture combining hash and sort-merge algorithms for join acceleration. In the build phase, the architecture utilizes a single hash function to build hash tables for two data tables, and the hash collisions are addressed by building ordered linked lists according to their join attributes. In the merge phase, mapped buckets in two hash tables are merged one-to-one to find matching tuples. This architecture lends itself to high parallelism to improve its performance. Experimental results show that the design on a FPGA achieved a high join throughput of 194.0 million tuples per second, which is better than the reported FPGA implementations. Moreover, the architecture is perfectly compatible with both N-to-1 and N-to-M join relationships.
- Published
- 2021
49. The fundamental surplus strikes again
- Author
-
Lars Ljungqvist and Thomas J. Sargent
- Subjects
Economics and Econometrics ,Bargaining problem ,Matching (statistics) ,media_common.quotation_subject ,05 social sciences ,Microeconomics ,0502 economics and business ,Unemployment ,Economics ,Dynamic stochastic general equilibrium ,Business cycle ,Join (sigma algebra) ,050207 economics ,Productivity ,050205 econometrics ,media_common - Abstract
The fundamental surplus isolates parameters that determine how sensitively unemployment responds to productivity shocks in the matching models of Christiano et al. ( 2016 and this issue) under either Nash bargaining or alternating-offer bargaining. Those models thus join a collection of models in which diverse forces are intermediated through the fundamental surplus.
- Published
- 2021
50. Proximal Policy Optimization-based Join Order Optimization with Spark SQL
- Author
-
Kyeong-Min Lee, InA Kim, and Kyu-Chul Lee
- Subjects
SQL ,Computer science ,Order (business) ,Programming language ,Signal Processing ,Spark (mathematics) ,Join (sigma algebra) ,Electrical and Electronic Engineering ,computer.software_genre ,computer ,computer.programming_language - Published
- 2021
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