Web Based Interfaces

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Reading Critiques

Vineet Raghu 0:25:03 11/22/2015

Opinion Space: A Scalable tool for Browsing Online Comments This article presents an application that allows users to effectively browse varying opinions over a given topic. In particular, the application solves the problems of a one dimensional opinion scale, by portraying opinions over two dimensions, using a statistical method called PCA to take a five question opinion test and construct a two dimensional user profile point that maintains the relative distance between opinions. To evaluate the opinion space prototype, the authors conducted a user study in which the opinion space model was compared to a standard listing of user comments, and a grid of user comments. The study was a within subject design with random ordering of interface types, in which each user was told to read and evaluate 10 other user comments on the given topic, and to explore at their will for a maximum of 15 minutes. The authors gave a list of five hypotheses that they believed would be supported by the data from this study. After this examination, they found that some of these hypotheses were supported with statistical significance. These include that the space interface allows users to find more “useful” comments, the space interface gives significantly greater user agreement with others’ comments, and the space interface did allow users to have more respect for other’s opinions than the list interface, but this difference was not statistically significant with the grid interface. One criticism I have with this study is that it is very possible for users of these interfaces to not give logical responses to these questions since they are entirely subjective. Though it may be difficult to find any sort of objective experimental process for this, it is difficult to fully trust these results. Overall, this is a fascinating idea that can make browsing through opinionated forums significantly better. Applying this to real webpages would be a great next step, as would expanding the scope of the user study to a greater amount of topics and more users. -------------------------------------------------------------------------------------------------------- Zoetrope: Interacting with the Ephemeral Web This article presents a prototype called Zoetrope, which allows users to explore webpages as they existed in the past. Typically, web browsers only allow users to view current iterations of a webpage, but Zoetrope allows users to use filters to specify both temporal and positional specifications of a webpage. Zoetrope accomplishes this webpage history examination through the use of three types of lenses (Visual, Structural, Textual). Visual lenses allow certain coordinates on a webpage to be tracked. Structural lenses provide tracking of a specific object in the DOM of the HTML page, and textual lenses provide tracking of specific text throughout the webpage. These can then be coupled with filters to further subdivide the page. The application also provides different visualizations for users to see the histories of the requested webpage. For example, users can perform automatic visualizations of time series data from webpages, or perform automatic clustering of webpages. For a more aesthetic example, users can also examine how the images in a webpage changed overtime using a timeline visualization. Overall, Zoetrope provides a unique way to examine the past state of webpages instead of solely gathering the current state of webpages, and it appears to be a novel addition to web based interactions. One critique of this paper is that there was no study or evaluation of the interface by potential users, so it is difficult for readers to determine how effective the prototype is.

Ankita Mohapatra 13:22:21 11/23/2015

Opinion Space: A Scalable Tool for Browsing Online Comments (2010) Siamak Faridani, Ephrat Bitton, Kimiko Ryokai, Ken Goldberg This paper offers a novel system for filtering and presenting comments to website users called Opinion Space. This topic is immediately interesting, as the issue of “cyberpolarization” mentioned in the paper is familiar to any frequent Internet user. What the authors seem most focused on is ensuring that thoughtful, moderate comments make their way on to the users’ screen in spite of a plethora of extreme and hateful comments. This work falls under the category of “discourse architecture” as an attempt to facilitate large-scale conversations. Interesting about this system is that, at least at first, it was released to the public for any users to come and contribute comment ratings. The system seems to explore different reward systems for encouraging good behavior in commenting and exposure to a diversity of comments. In the related work, authors draw on related work on social network analysis, sentiment analysis, polling techniques, social psychology, collaborative filtering, and other social computing concepts. To feasibly display a map of other users’ comments in Opinion Space, a mathematical technique called principal component analysis was used which was well-explained with Figure 4. The experimental setup was unique in that there were a total of five hypotheses considered and tested. This paper described its experimental setup well, and went into incredible detail about all of the statistical techniques used. Inferential statistics were calculated on all five of the hypotheses, and discussion on each was insightful for how users interact with comments. -------------------------------------------------------------------------- Zoetrope: Interacting with the Ephemeral Web Eytan Adar, Mira Dontcheva, James Fogarty, Daniel S. Weld This paper starts by identifying a unique feature of the Internet – its rapid change. Because websites are so frequently altered/updated, the authors believe that being able to navigate the “historical Web” would grant access to information that is currently lost in time. Providing the utmost clarity, this paper simply lists its contributions in a bulleted list. Features are well-explained with their figures. A figure should have been included for the structural lens feature because it was not as clear as others. The description of the Zoetrope system is grounded in the concept of content (data) streams, making it easier for other computer scientists to understand; all of the features are explained in terms of tuples and their transformations, concepts familiar from data stream management. The work in this paper seemed to be approaching the problem from the “wrong” direction. While the utility of many of the features of Zoetrope is clear, I think that adding historical features to websites would cover anything that Zoetrope is accomplishing. Site-specific historical features would also provide more consistent quality than Zoetrope because they would be developed with the specific topic domain of the website in mind. This paper sheds light on how historical access to the Web could be useful, but the history that the authors are interested in is largely content. These websites probably store historical content data anyway and could serve it on user request if historical access features and queries were added to their sites. The paper does at least contribute, then, methods for manipulating data streams.

Mahbaneh Eshaghzadeh Torbati 14:45:55 11/29/2015

Critique of Opinion Space, A Scalable Tool for Browsing Online Comments: In one view, this paper introduced a high performance system presents online comments visually to users. Author also mentioned the experiment they conduct to evaluate whether this system is good enough to perform better than the state of the art. The proposed system is a valuable, since nowadays we notice increasing stream of online comments generated than before. Reading all comments is a hard and boring job for users. List view of the comments takes a lot of time for the users to conclude if the product is good or not. Opinion Space highlights the comments found most insightful by users in a place full of points of reviews, thus it makes viewing of online comments become easier. Users can easily brows the reviews and focus on the highlighted reviews to make decision about buying the item. For system evaluation, authors conducted user study in which a comparison between Opinion Space with list view and grid view has been done. The result shows that Opinion Space is more satisfiable in users’ mind. Visualization of contents may be able to expend to some new area other than online comments. For instance, in education systems, after the grading of homework, if the common problems can be show in this way, instructor will be able to easily find the materials needed to be re-explained for students. -------------------------------------------------------------------Critique for Zoetrope: interaction with the Ephemeral Web. The proposed system gives user the chance to see the former content of the web. Since web content is changing fast at this age, this system can help user to find information from Internet easier. Zoetrope helps users to see the web content both in their new and former versions. This is a very useful tool for people to find content on the web. Mostly, in cases which links in publications are expired. In these situations, Zoetrope will help us. In some cases, websites change so rapidly that users can not find materials read recently, thus they may not find it again in the future if they don’t using some tools like Zoetrope. The authors both introduced the idea and enhanced it and made ready to use. By using Lenses in the system, the system can display the history of a certain area in the web content. It also embedded some filters to help user to find some certain content. It made advantages of three types of lenses, visual, structural and textural. These three lenses works together to help user to targeting what they want to see. There are a lot of filters in the system that based on time, keyword, amounts etc. For having more accurate search, users can bind different lenses and filters together. With these filters and lenses user can easily find what they want to see. The system also includes the feature that can help to see the timeline visualization of the change of content in some website. It enhanced the function of the system. To my understanding, some similar system have already in the market, they may not work on web content. They may works on history of change for local machine, like Apple’s Time machine. But I think this system works better since it gives the user more way to do the search. I think this function can be extended into other system

Long Nguyen 17:36:35 11/29/2015

"Opinion space: a scalable tool for browsing online comments" This paper presents an idea to use 2 dimensional opinion space , helping analysis comments in a more scalable way. With today common interface for comment based on user's rating or views, the list of comments can become quite huge and difficult to maintain/ analysis. Opinion Space is designed as a tool to collect and visualize users comment. This tool is based on 2 main approaches: delibarative polling where users are polled on two sets of polls, after finishing the first poll, Opinion Space will tune and give user deliberative time for the second poll; and opinion mining where varieties of opinions will be determined. The tool also use an visualize technique, to reduce opnion space from 5 dimensional to 2 dimensional, with user's opinion presented as dot. Two user's comments with similar opinions will be placed closely, and two comments with contradict opinions will be placed seperately. This visualization helps users to view comment based on various perspective and help people to get their interested comments and ignore the extreme/ unconcerned opinions easier.--------------------------- "Zoetrope: interacting with the ephemeral web": With the never stop changing Internet and Website, this paper tries to solve a problem in web historical perspective, where website data will be lost after sometime. I think the idea of Zoetrope is nice and inspiring, however its approach has some problems. First, to store only the HTML files and ignore CSS is a big mistake, since with websites focuses mainly on design/art will be affected heavily. Historical data which lies in CSS files/ web interface will be lost. Second, even though deleting CSS files (which authors claim can save 70% of the content), historical data of a website would still be very huge to store (and that's why some individual websites do not store it). For the solution to these problems, I think Zoetrope can implement AI/ machine learning algorithms, which indentify website' properties, and based on them to store necessary/ important features of the website only.

Kent W. Nixon 19:32:55 11/29/2015

Zoetrope: Interacting with the Ephemeral Web In this paper, the author's present a novel way of visualizing changes in webpages over time. Their system, termed Zoetrope, allows a user to draw a rectangular "lens" over a section of a webpages, and by using a scented widget, select the chronological version of the page to view. This system functions by creating a tuple of a fully rendered image of the page combined with a DOM structure containing searchable page content. A database of tuples are built up over time using a crawler, with pages in the paper being sampled once per hour. The authors go on to describe some design decisions made during the development of Zoescope. For example, as the location of page content can change irregularly based on the other content on the page changing, multiple content tracking methods are proposed: raw location, location of the DOM block the content is part of, and the location of a specific text string. The authors dedicate a lot of time to explaining how the final search method must be filtered using other properties, because multiple instances of the text may be repeated on the page, and because computational overhead is too high otherwise. The authors conclude by discussing methods of visualizing data, such as through short videos displaying the content changing over time, or by extracting and graphing graphical information. This was a paper similar to one we had last week where the authors simply describe a system they have made, and provide no real quantitative analysis of what the system is good for or insights provided by the system. I get the distinct feeling that the authors likely published a number of papers after this one based on the insight gathered through actually deploying this system in a real-world environment. As it stands, this document is essentially a slightly-deeper-than usual user manual for the Zoescope software. Apparently this is okay in the CHI field, though. Opinion Space: A Scalable Tool for Browsing Online Comments In this paper, the authors describe a forum response visualizer that improves upon existing methods. The authors claim that existing forums and comment sections heavily favor extremist opinions and often push the latest comment to the top so that it gains the most visibility. This is not good as it limits discussions to a binary system (one side vs. the other) and makes it difficult to actually find insightful posts. The authors propose a new system called Opinion Space, which visualizes comments on a 2D plane where user comments are clustered by similar opinion, and where comments' light increases in size as they are repeatedly marked as "insightful." Extensive amounts of statistical analysis are performed in this paper to determine five major hypothesizes associated with the opinion space style of visualization versus the grid and list styles. While it is found that the opinion space is generally favored by users and results in a longer dwell time on comments in the opinion space, the diversity of opinions viewed by users is not significantly different with the opinion space versus grid or list, despite user surveys suggesting otherwise. This paper provides a very detailed step-by-step walkthrough of the statistical tests used by the authors to evaluate their opinion space system, going so far as to give a description of the idea behind dimensionality reduction. This is done to such an extent, however, that I cannot help but feel that the authors were simply trying to pad the length of the paper to 10 pages, which I assume is the conference limit. I am fairly certain that anyone with even a minimal background in research understands the idea of dimensionality reduction.


Opinion Space: A Scalable Tool for Browsing Online Comments: This paper shows us a new online tool, which incorporates ideas from deliberative polling, dimensionality reduction, and collaborative filtering and also creates a new interface for viewing online comments. It visualizes the comments into dots in a huge space and uses some similarity metrics to measure the relationship between different users. I think the most important part in this paper is the user study. They create three interfaces (including the space interface) to make an evaluation. They use List and Grid interface to be the control groups. What’s more, the authors apply lots of statistical approaches to analyze the user study data, which provide a new direction when we want to evaluate our hypotheses. I think in this Opinion Space, organization may be a problem in it. When we have lots of opinions from different persons, there will be lot of dots in that space. So the traditional pointing problem will show up. ---------------------------------------------------------------------------------------------------------------- Zeotrope: Interacting with the Ephemeral Web: This paper shows a novel system called Zeotrope that enables interaction with the historical web that would otherwise be lost in time. The idea behind Zoetrope is to provide a graphical tool that can track the changes of multiple websites and their elements through time. This allows for the quick cross-referencing of information across a large spectrum of data sources and quickly provides graphical analysis of the information. The user interface seems to be a patch programming UI associated with a 'sand box' type web viewer that allows multiple web pages to be rendered into a single working space. Zoetrope uses a number of novel interactions, the temporal Web can be manipulated, queried, and analyzed from the context of familiar pages.

Matthew Barren 21:41:24 11/29/2015

Summary of Opinion Space: Opinion Space is a comment organizer that uses a two dimensional space to layout responses in a manner that is more conducive for a user to parse the discussion. The space is organized to demonstrate distance in opinions and highlight favorable comments. Opinion Space is a platform that provides users with visualization of comments that have been posted to a particular discussion board. This breaks the mold of typical comment boards that are ordered by reverse chronological order, most recent first. More so, this system takes the users opinion and formats the display to demonstrate what posts the user would agree or disagree with. The authors state that this could potentially decrease or avoid inflammatory comments. The idea that this will diminish aggressive comments is unlikely. It is more likely that this method will result in users who wish to not see inflammatory comments to avoid these discussions. There is a significant benefit to presenting comments by varying degrees of brightness based on the favorability of the comment. Doing so, allows users to find those comments that are considered to be the most informed or most highly rated. Amazon uses a similar function by featuring those comments that are rated highest in a special comment pane. Although this is an excellent system idea, there are definite limitations to it. First, not all comments can be judged on a polarized scale. In some instances, such as a news article, there may not be a clear opinion to judge either side of the discussion. Additionally, it seems this reviewing system requires users to have a history or a profile to truly organize the data. In the instance of many individuals not having a profile the space display may have a lot of noise and disorganized data. The study of Opinion Space sets a high bar to prove five different hypotheses. The hypotheses that are established are far to vague compared to the studies that are conducted. Thus, claiming that the hypotheses was proven or disproven is unclear because each hypothesis was not specific enough to the experiment. Summary of Zoetrope: Zoetrope is a software system that crawls through web pages, and stores content as a tuple of time and content. Storing these web pages creates a historical archive of data. Zoetrope is an extremely interesting idea that enables individuals to explore content that was previously on a web page. There are a number of circumstances where this can be particularly useful. First, there does not exist a table or graph for all data that may be useful for a particular user. An example in the paper is traffic patterns for a specific road. Using Zoetrope, a user can revisit this data by essentially rewinding the webpage. There are many other useful functions for Zoetrope. Filtering features enable users to specify desired content. This is extremely useful when there are several instances that a user is looking for. In these circumstances, the users will most likely not know the specific locations of the data they are looking for. Clustering and filtering can be very useful for individuals interested in researching data that has been temporally stored on the Internet. In many instances, data is erased, replaced, or altered, and an archive may not be available to view the data at particular instances. Using Zoetrope, a researcher cannot explore data over the course of its lifespan. One interesting problem with Zoetrope is user specific content. Websites work to provide user specific experiences, such as differing content based on demographics. As personalization of Internet content increases, Zoetrope will need to change the model of the data it collects for these sites. In some instances, it may be impractical to store data related to pages that are highly specific to an individual user, such as the homepage on Amazon.

Ameya Daphalapurkar 23:38:23 11/29/2015

The paper titled ‘Open Space: A scalable tool for browsing online comments’ basically describes the system of opinion space which help the users look at the diversity of comments in a particular application page. This helps in not getting caught up in viewing the comments which are present only because of majority. Cyber polarization of users thus doesn’t occur. The topic particularly has witnessed many research topics. One such example is of the Opinion Mining whose disadvantage is only that it is inherent bias. The features of Opinion Space includes allowing users to comment and rate on various subjects or topics although the feature that is not so good is the fact that these comments can be altered anytime. The user study had a majority of male participation and this was a problem in itself because if there was any interaction that would be specific to gender then the values and results would be different ratios and thus not perfectly represented. I feel a more diverse participant range should have been appointed for the study. If compared to the traditional alternative the system does have, thus, a lot of improvement to go through. ********************************************** The paper title ‘Zoetrope: Interacting with the ephemeral web ‘is a description of a system that involves a lot of past and history as to when the web pages are concerned. It enables the user to see the content of the page that was there before but isn’t actually there now. The first feature is a slider. This slider acts as a timeline with we can go past the time as and how many years we want. This is implemented by use of the web crawler. Other feature is the Lens. They help to limit the content selection as only that part or segment along with its changes over the past are viewed. Lenses are bifurcated into many subtypes, but are of the same use. The concept of visualization tools is another introduction by the author that involves data user will need to understand. The logic being a picture is worth more than thousand words, that is, graphs would better represent the data. Although, I feel that websites like Wayback function exactly like this and thus even though the concept being awesome doesn’t strike to be that intriguing.

Manali Shimpi 23:51:39 11/29/2015

Opinion space: a scalable tool for browsing online comments: It is very popular today on web sites to allow users to enter comments on various topics, articles etc. and also allow users to refer to other people’s comments. The interface used for this comment system is not very efficient and has different problems. It has linearly organized layout which is sorted by most recent post. The paper present a new interface for this called as opinion space that incorporates deliberative polling, dimensionality reduction, and collaborative filtering. It makes use of map containing various color codes representing various users and their comments. This allows other users to navigate through various comments. A user study was performed with linear interface, grid interface and space interface which is similar to opinion space. It was found that the users preferred space interface most significantly. The paper also shows that opinion space makes interface easy to understand and intuitive and thus has an advantage of reducing barrier to entry. The paper also interestingly classifies the users into casual, author and gamers. At the end the paper shows a lot of scope for future work.------------------------------------------------- Zoetrope: interacting with the ephemeral web: This paper is about a system that stores the contents of the web site which is used to show the user the contents of the website in the past. This system basically has a crawler, a database and an interface. The crawler is used to search for the contents in the World Wide Web. The database stores the content returned by the crawler and interface provides access to the stored data. The past of the web site is shown using timelines, clustering and time series. The biggest concern of Zoetrope is how to deal with the big data that is generated by the web site.

Lei Zhao 1:35:12 11/30/2015

Opinion space: a scalable tool for browsing online comments Their goal is to go beyond visualization of relationships in the graph, to find a more effective way to explore and analyze interactions in social networks. In other words, to learn about the relationships between each comment in a 2D space rather than in a linearly time fashion. The distance represents the similarity between two opinions, and all comments are displayed in a 2D space. Personally, I think this idea is better when applied to large displays where comments are no longer dots but actual texts. In their user study, the linear approach forces the users to browse comments one by one by using blurring. However, it is not true most of the time, because a user should be able to jump back and force as well as skim and skip between comments. Thus, I believe that representing comments in actual text, which requires more display space, is a better idea than representing in dots, which requires extra clicking/hovering efforts and prevents users from skimming. One technique used in this paper is that the author conducted two-way ANOVA to test if there exists carry-over effect in their user study, which is very persuasive. The data analysis part is a bit confusing to me because they conducted a handful of different tests for significance. I am wondering how to properly choose the type of significance test for different data, since different tests have different assumptions. The authors seem to be good in statistics, however I am wondering where should we start as a student in interdisciplinary area. =============================== Zoetrope: Interacting with the Ephemeral Web In this paper, the authors present a system called Zoetrope that enables interaction with the historical Web that would otherwise be lost to time. Using a number of novel interactions, the temporal Web can be manipulated, queried, and analyzed from the context of familar pages. Users can explore past versions of entire pages or place lenses on any part of a webpage to scan backwards through time by using a tooltip view called lenses. Furthermore, developers can use Zoetrope to rapidly prototype and test temporal queries through Zoetrope’s visual query interface. With the Zoetrope system, we introduce a novel semantics for dealing with temporal Web data and show a small number of operators that can be utilized for many different tasks. The idea of Zoetrope is tempting, however, as I observe, the changing of webpages sometimes is not relevant to its structure, i.e. the DOM tree. Most of the time, a newer version of webpage will result in complete deletion of nodes, new structure and so on. In this situation, the system might not be able to perform well.

Priyanka Walke 1:59:05 11/30/2015

Reading Critique On Opinion Space: A Scalable Tool for Browsing Online Comments This paper provides a brief summary of creating a new platform for browsing online comments and comparing them with the existing implementation to see the effects for some innovative solutions. The authors call this discussion as the Opinion space. They highlight the existing problems in case of online discussion and commenting forums, nearly majority of them use a list view in order to display the comments which creates a problem when one wants to search a specific comment i.e. it reduces the flexibility of use for the users. The paper on Stack Overflow mostly included technical problems. Moreover, the interest there was not in diversity but in solving some specific problems. Ratings do help in this case but not topics where the views by people are much more diverse and not just a single one can be picked up as the correct one. Hence, for this opinion space, the paper uses PCA to map the diversity of opinions in relation to the user’s profile on a 2 dimensional scale. The distance indicates how much the opinions differ whereas larger, brighter coloured spaces indicate for which many people agree and/or respect. The experiments show that there is no statistical significance when it comes to increasing the diversity of comments read by the user. However, the problem is that in case of list view also, the comments are ordered randomly. Here the essence lies in having a tight control on the variation in the diversity that we want to view or exhibit. A few problems identified by the authors have some solutions proposed for them. One of them being creation of a scale to view exactly where each opinion lies and add some background info thereby making the application more informative. The paper is well written in terms the research and presentation. ================================================= Reading Critique On Zoetrope: Interacting with the Ephemeral Web This paper describes Zoetrope, which is a software created to interact with historical representations of web pages for purpose of collecting, viewing and representing relative data in an easily acceptable and sophisticated manner. The paper comprises of all the implementation details of Zoetrope along with the algorithms and libraries used, problem solving concepts, languages used in implementation. The application is well constructed and is highly innovative, however, there is no detailed study on the background research stated, or the existing solutions for the same and the comparison between them and Zoetrope have also not been mentioned. It also does not state the purpose behind creation of such an application, meanwhile, there are few existing techniques available to collect such data as the analysis is generally maintained for sports or news sites. However, the paper thoroughly discusses the problem faced by them while writing it and also the ways the used to resolve them. These problems are using filters and different types of lenses, Memory demands of such an implementation, the capturing mechanism modifications that are possible. Major issue here is that not every page remains fixed. Modifications to the layout of webpages has been discussed extensively with data being provided. It does not provide any user study, because it is the first application of this type. However, it mentions AT&T Difference engine thereby defining a baseline which can be used to compare their application.

Samanvoy Panati 2:08:27 11/30/2015

Critique 1: Opinion space: a scalable tool for browsing online comments This paper offers a novel system for filtering and presenting comments to website users called Opinion Space. The authors have highlighted the existing problems in online discussion and commenting forums, most of which use the list view to display the comments, which creates a problem trying to find the ones you may want to read, in simple words there is no flexibility. Interesting about this system is that, at least at first, it was released to the public for any users to come and contribute comment ratings. The system seems to explore different reward systems for encouraging good behavior in commenting and exposure to a diversity of comments. The main idea lies in having control on the variation of diversity you want to view, from extremes to minor difference in opinions. In the related work, authors draw on related work on social network analysis, sentiment analysis, polling techniques, social psychology, collaborative filtering, and other social computing concepts. To feasibly display a map of other users’ comments in Opinion Space, a mathematical technique called principal component analysis was used which was well-explained. The experimental setup was unique in that there were a total of five hypotheses considered and tested. This paper described its experimental setup well, and went into incredible detail about all of the statistical techniques used. Inferential statistics were calculated on all five of the hypotheses, and discussion on each was insightful for how users interact with comments ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Critique 2: Zoetrope: interacting with the ephemeral online comments This paper introduced a new system that works to give user the chance to see the web content in the past. The authors have introduced lenses and filters as means to view temporal information on webpages. The technique is based on information retrieval over a set of temporal instances of the same webpage. Zoetrope is a system that helps users to see the web content not only the fresh one, but also the content in the past. This is a very useful tool for people to find content on the web. When people find a link in some published article that go public for several years, the link may not be able to pointing to the right content. The author not only introduced the idea, but also enhances it and made it be possible to use properly. The author added Lenses in the system, which is used to display the history of a certain area in the web content. It also embedded some filters to help user to find some certain content. It included visual lenses structural lenses and also textural lenses. The users can use these lenses combined with filters to view interested information overtime. This is another application of history tool that we have seen in outpost and a tool for drawing. There are a lot of filters in the system that based on time, keyword, amounts etc. The system also includes the feature that can help to see the timeline visualization of the change of content in some website.

Jesse Davis 4:48:01 11/30/2015

Opinion Space: A Scalable Tool for Browsing Online Comments Opinion Space seems like a very intriguing and useful tool that is useful for finding out a lot of information via comments and would be interesting to see employed on additional forms of information hubs (i.e. social media, YouTube, reddit, etc.) However, I did find that the whole method seemed a bit tedious and could potentially ward off users that are disinterested/too busy to take the time to actually tweak the sliders and produce an engaging comment. In turn, I believe this also serves as a method to weed out those who would try to post comments that would only serve to troll the piece of information being considered. I believe a combination of the Opinion Space with a system that alludes to more binary ratings would net a larger portion of users and would be able to provide a variety of views with quicker user feedback (i.e. something similar to Yelp where users can rate comments in a variety of ways and then you can view different aspects of restaurants/users based on that). Conclusively, this a very sophisticated tool that can be used where pools of users are trying to have in-depth discussions with an attention to detail in each response. Zoetrope: Interacting with the Ephemeral Web After reading the paper on Zoetrope, I found the amount of work that went into its robustness frighteningly impressive. The amount of work and research that went into DOM tracking and element targeting for the time windows was astounding to read and I think they put an amazing amount of thought into it. Additionally, another concern of mine was the storage space, but it appears they handled this near the end of the paper, where they address this fact and state “the average HTML page crawled 5 weeks after the original visit requires only an additional 2 Kb of storage”; although I still think it would be a difficult task to scale, they also mention trying various methods for future iterations (for example, they referenced [5] “ChangeDetector: A Site-Level Monitoring Tool for the WWW” in the paper). Overall, this is a very impressive tool and I appreciate the amount of work that went into the robustness of the application as well as the number of examples they gave for each scenario (primarily starring Ed).

Shijia Liu 6:17:55 11/30/2015

Opinion Space: A Scalable Tool for Browsing Online Comments : This paper showed us a new tool for browsing online comments, the Opinion Space, the old type work didn't perform as good as our expection. Opinion Space operate as a self-organizing system that encourages users to find and consider comments written by those who hold opinions different from their own. Before doing the research, the authors made an hypothesis that users would find the Space interface significantly more conducive to finding useful comments. And then they confirmed it with their experiment, users are more engaged when the diversity of viewpoints and the uniqueness of each participant’s opinion were conveyed. And all is all these interfaces were very effective on users to a diversity of comments.========================Zoetrope: Interacting with the Ephemeral Web:This paper shows us Zoetrope, a system for interacting with the ephemeral Web. Zoetrope is a system that let people to interact and manipulate the record of the web. Users can use Zoetrope to prototype and test temporal queries through Zoetrope’s visual query interface. The authors are also extending the semantics of the underlying language to support more sophisticated queries and binding operations for specifying temporal logic operations and functions.By some experiment and improving the visualization it has a better implementation and have a good perspective future for continue explore it.

Zihao Zhao 9:32:56 11/30/2015

“Opinion Space: A Scalable Tool for Browsing Online Comments” is a paper which proposed an approach to visualize the online comments. This paper give me a insightful idea in the comment analysis area. There are a lot of work like the Discourse Architecture and and Poligraph who have been invented by other researchers. The main technique in this area is not complicated, they use Dimensionality Reduction which is a mature method in machine learning area. When I read this paper, I feel that the fatal weakness of their work may lay in the evaluation part. Since the user study of this work is to compare the Score of ‘List’, ‘Grid’ and ‘Space’ Approach, how does the data mean by an enhancement of 30%. And there are so many related work in these area as the author mentioned, they can compare their method with some existing method and see what happens. In a word, the baseline is not strong enough to make a big contribution. Moreover, the evaluation part may be a tricky part. The data collected are called ‘Average Dwell Time’, ‘Average Agree with Rating’. I think what does the data mean in these part still remains un-unanswered. Does it mean the approach is useful when the users spend more dwelling time? Maybe the motivation is different for different users. Maybe some users wants to find some comments with high rating and this approach is the same as the ‘List’ approach. The paper also mentioned this point from the data collected from the questionnaire. People are accustomed to the ‘List’ way of the comments and the ‘List’ has a better affordance than the ‘Space’. There is one thing which really impressed me. The part of summary of results is novel to me because it adopt a hypothesis defend way. They proposed five hypothesis before the experiment and the defend their hypothesis with their data. I think this is a good way to analyze data because the user will be more clear about what the conclusions the author are going to draw from the data when they first see the hypothesis.—————————————————— ‘Zoetrope: Interacting with the Ephemeral Web’ is a paper which present an approach to enable users interact with historical Web. This is a paper of description and without any user study. I think the main reason for not adopting user study is that this approach is a new approach to address this problem. Users can choose the areas they want to explore and move the slider to see the historical data of the web pages. Although the author presented many ways to use the Zoetrope, the main goal he/she want to do is to verify that this approach is a valid solution to historical Web data. When I first read this paper and come to their idea to show the history data of the Web a concern appears in my mind: How could they dispose with the large amount of data for the Website’s history. However, at the implementation part, they address this problem. Since they only to store the whole page of the original site and don’t have to store the css style files for the descendent history. And a HTML will become around 30% size without the css style files. It seems that my concerned problem has been resolved. However, the changes of the websites are not just the data in the same CSS style. There are the cases that the web designers changed the whole style of the site. What if we get the data with ‘Zoetrope’ and with an un compatible CSS file? In this case, I think the regional query can still work while the whole history website will be invalid. We can project the single data like the data of stock changes and the data of oil price. These single data are tractable even thought the CSS style file changed. Although there exists some weakness, I like this idea not jus it proposed a valid solution to solve the ephemeral web but because it is one of the most profound manipulation of virtual reality that can really make the Web the most versatile source that could be used for any kind of research that one does.