Journal of Visual Languages and Computing最新文献_第10页

UNMAT: Visual comparison and exploration of uncertainty in large graph sampling UNMAT：大图形采样中不确定性的可视化比较和探索

Journal of Visual Languages and Computing Pub Date : 2017-08-01 DOI: 10.1016/j.jvlc.2017.05.006

Tan Tang, Sufei Wang, Yunfeng Li, Bohan Li, Yingcai Wu

{"title":"UNMAT: Visual comparison and exploration of uncertainty in large graph sampling","authors":"Tan Tang, Sufei Wang, Yunfeng Li, Bohan Li, Yingcai Wu","doi":"10.1016/j.jvlc.2017.05.006","DOIUrl":"https://doi.org/10.1016/j.jvlc.2017.05.006","url":null,"abstract":"<div><p><span>Graph sampling, simplying the networks while preserving primary graph characteristics, provides a convenient means for exploring large network. During the last few years a variety of graph sampling algorithms have been proposed, and the evaluation and comparison of the algorithms has witnessed a growing interest. Although different tests have been conducted, an important aspect of graph sampling, namely, uncertainty in graph sampling, has been ignored so far. Additionally, existing studies mainly rely on simple statistical analysis and a few relatively small datasets. They may not be applicable to other more complicated graphs with much larger numbers of nodes and edges. Furthermore, while </span>graph clustering is becoming increasingly important, it is still unknown how different sampling algorithms and their associated uncertainty can impact the subsequent graph analysis, such as graph clustering. In this work, we propose an efficient visual analytics framework for measuring the uncertainty from different graph sampling methods and quantifying the influence of the uncertainty in general graph analysis procedures. A spreadsheet-style visualization with rich user interactions is presented to facilitate visual comparison and analysis of multiple graph sampling algorithms. Our framework helps users gain a better understanding of the graph sampling methods in producing uncertainty information. The framework also makes it possible for users to quickly evaluate graph sampling algorithms and select the most appropriate one for their applications.</p></div>","PeriodicalId":54754,"journal":{"name":"Journal of Visual Languages and Computing","volume":"41 ","pages":"Pages 71-78"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jvlc.2017.05.006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72062025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Signifying software engineering to computational thinking learners with AgentSheets and PoliFacets 用AgentSheets和PoliFacets向计算思维学习者展示软件工程

Journal of Visual Languages and Computing Pub Date : 2017-06-01 DOI: 10.1016/j.jvlc.2017.01.005

Ingrid Teixeira Monteiro , Luciana Cardoso de Castro Salgado , Marcelle Pereira Mota , Andréia Libório Sampaio , Clarisse Sieckenius de Souza

{"title":"Signifying software engineering to computational thinking learners with AgentSheets and PoliFacets","authors":"Ingrid Teixeira Monteiro , Luciana Cardoso de Castro Salgado , Marcelle Pereira Mota , Andréia Libório Sampaio , Clarisse Sieckenius de Souza","doi":"10.1016/j.jvlc.2017.01.005","DOIUrl":"https://doi.org/10.1016/j.jvlc.2017.01.005","url":null,"abstract":"<div><p>Nonprofessional end user programs have increased remarkably in volume and diversity. However, for such programs to be usable and reliable, their creators should be familiar with software engineering practices that are typically not part of their range of competence and source of enjoyment. While the expansion of computational thinking acquisition (CTA) initiatives at schools and the availability of improved programming environments have contributed to facilitate the learners’ <em>coding</em> tasks, much less has been done to facilitate the acquisition of software quality notions. This paper reports on a Brazilian CTA program guided by semiotic principles and describes a study of how the technology used in it prefigures elements of software engineering in the participants’ programs created with AgentSheets. Our research contributions touch on the semiotic potential of CTA infrastructures and on associated pedagogical considerations for expanding CTA programs with software engineering basics. We also propose items for an interdisciplinary research agenda.</p></div>","PeriodicalId":54754,"journal":{"name":"Journal of Visual Languages and Computing","volume":"40 ","pages":"Pages 91-112"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jvlc.2017.01.005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72100900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 16

Self-expression and discourse continuity in a multilevel EUD environment: The case of moodle 多层次EUD环境下的自我表达与话语连续性——以moodle为例

Journal of Visual Languages and Computing Pub Date : 2017-06-01 DOI: 10.1016/j.jvlc.2017.04.003

Luciana da Silveira Espindola, Milene Selbach Silveira

{"title":"Self-expression and discourse continuity in a multilevel EUD environment: The case of moodle","authors":"Luciana da Silveira Espindola, Milene Selbach Silveira","doi":"10.1016/j.jvlc.2017.04.003","DOIUrl":"https://doi.org/10.1016/j.jvlc.2017.04.003","url":null,"abstract":"<div><p>The search for ways to empower end users in activities such as programming and application customization has been subject of great effort among the research community, leading to the development of EUD environments, proper for end user’s activities. Among such environments there are the ones that have multiple layers of (distinct) users, consequently allowing multiple customizations. As an example, we have the Virtual Learning Environments (VLEs), with focus on education. In the particular case of VLEs, we are interested in verifying the discourse continuity after multiple customizations by many users, looking at how it impacts on teacher’s self-expression at the end of this chain, and how this expression is perceived by the students while interacting with the product of their teacher’s effort. This is part of a qualitative and descriptive evaluation with theoretical fundamentals on the Semiotic Engineering theory, the self-expression phenomenon, and end-user development practices. We have conducted three studies using Moodle as the VLE of choice. The first one identified three ways by which teachers practice self-expression via Moodle: through written language, interface customization, and expression through content, and Study 2 revealed that students perceive these same ways of expression. Finally, the inspections and the analyses of the interviews and questionnaires applied during Study 3 have confirmed these results, even after many customizations. That is, the teacher’s self (e.g., personality) is present and recognizable via interface. By taking EUD under the perspective of the Semiotic Engineering theory and self-expression, we were able to study the metacommunication intrinsic to multilevel customization software such as Moodle.</p></div>","PeriodicalId":54754,"journal":{"name":"Journal of Visual Languages and Computing","volume":"40 ","pages":"Pages 36-50"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jvlc.2017.04.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72100901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Appropriating virtual learning environments: A study of teacher tactics 认可虚拟学习环境：教师策略研究

Journal of Visual Languages and Computing Pub Date : 2017-06-01 DOI: 10.1016/j.jvlc.2017.01.002

Jan Derboven, David Geerts, Dirk De Grooff

{"title":"Appropriating virtual learning environments: A study of teacher tactics","authors":"Jan Derboven, David Geerts, Dirk De Grooff","doi":"10.1016/j.jvlc.2017.01.002","DOIUrl":"https://doi.org/10.1016/j.jvlc.2017.01.002","url":null,"abstract":"<div><p><span><span>In research on Virtual Learning Environments (VLEs), it has been shown that teachers often do not explore VLEs to their full potential and only adopt a limited set of the available tools. In this article, we approach teachers’ design of VLE </span>learning activities as end user development. We describe a study of Toledo, a virtual learning environment used across several higher education institutions in Belgium. Using a combination of a semiotic, multimodal analysis and an in-depth user study with 24 respondents, we provide a detailed account of how teachers appropriate the learning environment to suit their needs. Combining the insights from the semiotic investigation and the user research, we analyze how user appropriations can be explained as practices emerging from both how the platform communicates, and contextual factors. The study showed that some teachers design very specific learning activities using the VLE - </span><em>not</em> by using the dedicated VLE tool, but by reinterpreting more generic tools. These appropriation tactics concentrate platform use in a limited number of tools, even when teachers do use more complex learning activities. These results have implications for the design of VLEs: rather than offering a wide range of tools targeted at specific learning activities, VLEs could concentrate on providing basic communication tools that are open for appropriation.</p></div>","PeriodicalId":54754,"journal":{"name":"Journal of Visual Languages and Computing","volume":"40 ","pages":"Pages 20-35"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jvlc.2017.01.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72100904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 20

Weaving semiotic engineering in meta-design: A case study analysis 元设计中的符号工程编织——案例分析

Journal of Visual Languages and Computing Pub Date : 2017-06-01 DOI: 10.1016/j.jvlc.2017.04.002

Daniela Fogli

{"title":"Weaving semiotic engineering in meta-design: A case study analysis","authors":"Daniela Fogli","doi":"10.1016/j.jvlc.2017.04.002","DOIUrl":"https://doi.org/10.1016/j.jvlc.2017.04.002","url":null,"abstract":"<div><p>The work presented in this paper aims at investigating how semiotic engineering and meta-design could be combined to support the development of socio-technical environments that enable End-User Development (EUD). In particular, I investigate the relationships existing between domain experts, playing the role of end-user developers, and meta-designers, mediated by EUD environments, and between end users and end-user developers mediated by EUD products. To this end, three case studies are considered, which belong to the recent research experience in EUD of the author. The case studies are concerned with three different application domains, namely physical prototyping of social products, accumulation and sharing of territory knowledge for first aid intervention, development of e-government services for the citizens of a municipality. The analysis is carried out both on the design process, by adopting a meta-design perspective, and on the product developed in each project, according to a semiotic engineering perspective. The analysis allows to shed light on the human and technical actors involved in EUD and on their communication processes, in order to understand which kinds of interaction visual languages and social conditions should be defined to encourage a continuous user-system co-evolution. As a result, the paper finally proposes some operative indications for the design of systems enabling EUD, which capitalize on semiotic engineering and meta-design ideas.</p></div>","PeriodicalId":54754,"journal":{"name":"Journal of Visual Languages and Computing","volume":"40 ","pages":"Pages 113-127"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jvlc.2017.04.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72100897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

A visual language and interactive system for end-user development of internet of things ecosystems 物联网生态系统最终用户开发的可视化语言和交互系统

Journal of Visual Languages and Computing Pub Date : 2017-06-01 DOI: 10.1016/j.jvlc.2017.01.004

Barbara Rita Barricelli, Stefano Valtolina

{"title":"A visual language and interactive system for end-user development of internet of things ecosystems","authors":"Barbara Rita Barricelli, Stefano Valtolina","doi":"10.1016/j.jvlc.2017.01.004","DOIUrl":"https://doi.org/10.1016/j.jvlc.2017.01.004","url":null,"abstract":"<div><p>This paper presents the definition of a visual language and its implementation with the design of a visual interactive system for the collaborative management of Internet of Things (IoT) sensors (e.g., wearable fitness trackers, ambient sensors<span>, fitness apps, nutrition apps, sleep trackers) for improving people's quality of life and promoting wellness awareness. The system, called SmartFit Rule Editor, is designed to be used by coaches and trainers of non-professional teams of athletes for monitoring and analyze fitness and wellness data streams and to support them in detecting relevant events and specifying rules for actions taking. Our research is framed under the scope of computer semiotics and semiotic engineering theories. This allows us to study how to support coaches and trainers as a community of domain experts – but not IT and IoT experts – to use elements of a visual language to indirectly manage physical devices and their data streams without the need to know technical specification of the devices, the apps, and the data. We apply a socio-technical approach to design being able to study the social and the technological aspects of the use of the Internet of Things ecosystem, considering them as closely interconnected and dependent. Such an approach underpins user-centered design and development methodologies in order to design the most suitable User eXperience according to users' culture, needs, context of use, and activity.</span></p></div>","PeriodicalId":54754,"journal":{"name":"Journal of Visual Languages and Computing","volume":"40 ","pages":"Pages 1-19"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jvlc.2017.01.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72106234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 37

An analysis of deictic signs in computer interfaces: contributions to the Semiotic Inspection Method 计算机接口中指示符号的分析：对符号检测方法的贡献

Journal of Visual Languages and Computing Pub Date : 2017-06-01 DOI: 10.1016/j.jvlc.2017.01.001

Aron Daniel Lopes, Vinicius Carvalho Pereira, Cristiano Maciel

引用次数: 3

Special Issue on Semiotics, Human-Computer Interaction and End-User Development 符号学、人机交互和最终用户开发特刊

Journal of Visual Languages and Computing Pub Date : 2017-06-01 DOI: 10.1016/S1045-926X(17)30107-6

Yvonne Dittrich , Antonio Piccinno

引用次数: 0

The semiotics of configurations for the immanent design of interactive computational systems 交互式计算系统内在设计的配置符号学

Journal of Visual Languages and Computing Pub Date : 2017-06-01 DOI: 10.1016/j.jvlc.2017.01.003

Federico Cabitza , Alvise Mattozzi

引用次数: 7

Design and evaluation of a multi-recommendation system for local code search 一种用于本地代码搜索的多推荐系统的设计与评估

Journal of Visual Languages and Computing Pub Date : 2017-04-01 DOI: 10.1016/j.jvlc.2016.07.002

Xi Ge , David C. Shepherd , Kostadin Damevski , Emerson Murphy-Hill

{"title":"Design and evaluation of a multi-recommendation system for local code search","authors":"Xi Ge , David C. Shepherd , Kostadin Damevski , Emerson Murphy-Hill","doi":"10.1016/j.jvlc.2016.07.002","DOIUrl":"https://doi.org/10.1016/j.jvlc.2016.07.002","url":null,"abstract":"<div><p>Searching for relevant code in the local code base is a common activity during software maintenance. However, previous research indicates that 88% of manually composed search queries retrieve no relevant results. One reason that many searches fail is existing search tools’ dependence on string matching algorithms, which cannot find semantically related code. To solve this problem by helping developers compose better queries, researchers have proposed numerous query recommendation techniques, relying on a variety of dictionaries and algorithms. However, few of these techniques are empirically evaluated by usage data from real-world developers. To fill this gap, we designed a multi-recommendation system that relies on the cooperation between several query recommendation techniques. We implemented and deployed this recommendation system within the Sando code search tool and conducted a longitudinal field study. Our study shows that over 34% of all queries were adopted from recommendation; and recommended queries retrieved results 11% more often than manual queries.</p></div>","PeriodicalId":54754,"journal":{"name":"Journal of Visual Languages and Computing","volume":"39 ","pages":"Pages 1-9"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jvlc.2016.07.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72110656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10