Search

Smart devices, such as soft robots, artificial organs, and soft actuators, require materials that adapt their morphologies and properties in response to their environment. These materials can be obtained through the composition of different types of materials that exhibit different responses to environmental stimuli, arranged in a rational spatial configuration. We achieved unique responsive materials by forming interfaces and surfaces of appropriate materials using the sol–gel method. In recent decades, we have proposed the use of wrinkles and nano-brushes on sol–gel-derived materials for various sophisticated applications, such as micropattern fabrication, wettability control, and linear actuators for size-selective transportation. This account introduces environment-responsive materials with rational interfaces via the sol–gel method, particularly those characterized by surface morphology. Highlights: Responsive and adaptive interfaces fabricated via the sol–gel method. Microrolls formed by self-scrolling of sol–gel hybrid films. Photofabrication of micropatterns and actuators on sol–gel hybrid films. Manipulation of water droplets on titanate nanotube brushes fabricated by the sol–gel method. [ABSTRACT FROM AUTHOR]

2D materials are solid microscopic flakes with a‐few‐Angstrom thickness possessing some of the largest surface‐to‐volume ratios known. Altering their conformation state from a flat flake to a scroll or fiber offers a synergistic association of properties arising from 2D and 1D nanomaterials. However, a combination of the long‐range electrostatic and short‐range solvation forces produces an interlayer repulsion that has to be overcome, making scrolling 2D materials without disrupting the pristine structure a challenging task. Herein, a facile method is presented to alter the 2D materials' inter‐layer interactions by confining organic salts onto their basal area, forming 2D‐confined electrolytes. The confined electrolytes produce local charge inhomogeneities, which can conjugate across the interlayer gap, binding the two surfaces. This allows the 2D‐confined electrolytes to behave as polyelectrolytes within a higher dimensional order (2D → 1D) and form robust nanofibers with distinct electronic properties. The method is not material‐specific and the resulting fibers are tightly bound even though the crystal structure of the basal plane remains unaltered. [ABSTRACT FROM AUTHOR]

The mouse wheel may induce physical fatigue by requiring users to clutch the wheel repeatedly when scrolling long distances. To address this problem, some mouse products provide a free-spinning mode in which users can spin the wheel to initiate inertial scrolling. However, the time and effort required to toggle the free-spinning mode may lower the usability of the mouse wheel. To enable inertial scrolling without the overhead of mode switching, we present TouchWheel, a physical mouse wheel with touch sensitivity and a virtual wheel model that enables users to perform flick-and-stop operations as they do on touchscreens. A user experiment revealed that participants could actively use TouchWheel's flick-and-stop operation according to their different scrolling needs. For tasks that frequently required long-distance scrolling, TouchWheel outperformed a normal mouse wheel in task completion time and required fewer clutching and mode-switching actions than the normal mouse wheel and a spin-enabled mouse wheel. For tasks that required short-distance scrolling, TouchWheel performed similarly to other baseline options. [ABSTRACT FROM AUTHOR]

Scrolling is a widely used mean to interact with visual displays, usually to move content to a certain target location on the display. Understanding how user scroll might identify potentially suboptimal use and allows to infer users' intentions. In the present study, we examined where users click on a scrollbar depending on the intended scrolling action. In two online experiments, click positions were systematically adapted to the intended scrolling action. Click position selection could not be explained as strict optimization of the distance traveled with the cursor, memory load, or motor-cognitive factors. By contrast, for identical scrolling actions click positions strongly depended on the context and on previous scrolls. The behavior of our participants closely resembled behavior observed for manipulation of other physical devices and suggested a simple heuristic of movement planning. The results have implications for modeling human–computer interaction and may contribute to predicting user behavior. [ABSTRACT FROM AUTHOR]

In this paper I discuss the affordances and popularity of the short-video app TikTok from an audience studies point of view. I do so by drawing on findings from ethnographic fieldwork with young adult TikTok users based in the United Kingdom that was conducted in 2020 and 2021. I trace how using the app, specifically scrolling through the TikTok For You Page, the app's algorithmic content feed, became a fixed part of the everyday routines of young adults. I show how TikTok appealed to them as a convenient means of escape and relief that they were unable to find elsewhere during and beyond times of lockdown. Further, I highlight the complex nature of TikTok as an app and the active role that users play in imagining and appropriating the app's affordances as meaningful parts of their everyday social life. Closing the paper, I reflect on future directions of TikTok scholarship by stressing the importance of situated audience studies. [ABSTRACT FROM AUTHOR]

In four major parts, this study investigates the phenomenon of scrolling. Its first task is to argue in favor of a specific quality of the experience of scrolling, distinguishing it from other forms of distraction, notably from the flow experience. Scrolling takes the shape of aimless drifting. Secondly, it investigates the phenomenon of scrolling against its relevant historical, economic, social, and cultural backdrop, with the intention of understanding scrolling as a typical phenomenon of today, rather than subscribing to a biased and superficial critique of its wastefulness or outright pathological character. The third part presents a comprehensive analysis of the temporal makeup of scrolling. Its temporality is expressed in the specific impatience of scrolling. Furthermore, scrolling amounts to a temporal reduction in the sense of favoring the present moment (and suppressing the temporal dimensions of the past and the future). The reductiveness of scrolling pertains to the semantic content as well. I argue that scrolling does not allow for certain experiences (such as, e.g., profound sadness). The temporality of scrolling is one of experiencing lived time as the permanence of passing. In the last section, I connect scrolling to boredom, and argue that scrolling accomplishes the task of allowing for an existential distractedness. In conclusion, I propose a nuanced evaluation of scrolling: in a Pascalian sense, scrolling responds to a profoundly human need of distraction. Yet I find scrolling dangerous in how easily available such distraction becomes, and in how it accustoms the users to a reductive existential experience. Scrolling, unlike art (but also, in principle, photography, movies, books), shields the user from challenging and enriching experiences. [ABSTRACT FROM AUTHOR]

Most major platforms and news portals use the feed approach to information display, which offers people the ability to engage in continuous scrolling. This affordance, "scrollability," is an understudied feature that changes how people consume news. The endless scroll presents opportunities to monetize attention for advertisers, and a seemingly bottomless supply of headlines for news consumers. Moreover, more people report scrolling headlines than actually reading news stories. A scrollable technical environment creates circumstances that encourage headline reading, or what we call "news-scrolling," and yet we know little about the consequences of scrollability for other behaviors. In this paper we set forth an argument for increased scholarly attention to scrollability in the context of online news consumption, and articulate a theoretical framework for explaining the behaviors of news-scrollers and news-clickers. [ABSTRACT FROM AUTHOR]

Purpose: We aimed to determine whether Descemet's membrane (DM) scrolling occurs primarily along the vertical or horizontal axis and establish whether oval trephination along the axis of least scrolling can reduce the grade of the scroll. Methods: The longest limbus to limbus axis on 28 sclerocorneal discs was taken as the horizontal axis. The horizontal (n = 7) or (right angles to it) vertical (n = 6) axis was marked on DM before peeling it off. The direction and grade of scrolling was observed. Narrow strips (3-4 mm wide) were then cut along the two axes (n = 4 each) and the scrolling pattern was observed. Ellipses (7 x 9 mm) of DM were punched along the two axes (n = 6 each) and the scrolls graded. Immunofluorescent staining for elastin on horizontal and vertical tissue sections from three DM samples was performed. The intensity and thickness of elastin staining were measured. Results: Twenty four (85.72%) DM samples showed scrolling along the horizontal axis, none showed scrolling along the vertical axis, and four (14.28%) samples showed a spiral scroll, regardless of which axis was marked (grade 3.7 and 3.6). Vertically oval discs showed significantly reduced scrolling (grade 1.2) compared to horizontally oval discs (grade 3.5). Narrow strips of DM showed a similar scrolling pattern. Immunohistology showed no difference in any of the parameters examined along the two axes or from the center to the periphery. Conclusion: DM scrolls primarily along the horizontal axis. Vertically oval DM samples show minimal scrolling, which can be an advantage in DMEK. Differential scrolling is not determined by the distribution of elastin. [ABSTRACT FROM AUTHOR]

The perception of an image obtained by scrolling through a small screen can differ from the typical perception of a wide visual field in a stable environment. However, we do not fully understand image perception by scrolling on a small screen based on psychological knowledge of visual perception and cognition of images. This study investigated how screen size limitations and image shifts caused by scrolling affect image encoding in visual long-term memory. Participants explored the stimulus images under three conditions. Under the scrolling condition, they explored the image through a small screen. Under the moving-window condition, they explored the image by moving the screen over a masked image; this is similar to looking through a moving peephole. Under the no-window condition, participants were able to view the entire image simultaneously. Each stimulus comprised 12 objects. After 1 h, the samples were tested for object recognition. Consequently, the memory retention rate was higher in the scrolling and moving-window conditions than in the no-window condition, and no difference was observed between the scrolling and movingwindow conditions. The time required by participants to explore the stimulus was shorter under the no-window condition. Thus, encoding efficiency (i.e., the rate of encoding information into memory in a unit of time) did not differ among the three conditions. An analysis of the scan trace of the scrolling and window movements in relation to the image revealed differences between the scrolling and moving-window conditions in terms of the scan's dynamic features. Moreover, a negative correlation was observed between the memory retention rate and image-scrolling speed. We conclude that perceiving images by scrolling on a small screen enables better memory retention than that obtained through whole-image viewing if the viewing time is not limited. We suggest that viewing through a small screen is not necessarily disadvantageous for memory encoding efficiency depending on the presentation mode, and the results show that participants who scrolled fast tended to have worse memory retention. These findings can impact school education and thus suggest that the use of mobile devices in learning has some merit from the viewpoint of cognitive psychology. [ABSTRACT FROM AUTHOR]

Recognizing the appealing features of a tablet (e.g., an iPad), including size, mobility, touch screen display, and virtual keyboard, more educational professionals are moving away from larger laptop and desktop computers and turning to the iPad for their daily work, such as reading and writing. Following the results of a recent survey of individuals who serve as ETS raters, more than 40% reported that they would prefer to use an iPad or other type of tablet to score essays. However, iPad‐based essay scoring could affect scoring accuracy and scoring time because the smaller screen and other features of an iPad may also affect raters' reading comprehension and score assigning processes. To address this issue, we invited 10 experienced raters to score holistically 40 essays for a graduate admission test using a desktop computer and an iPad following a counterbalanced design. We compared the raters' scores against the criterion scores and analyzed scoring times, scoring behaviors, and raters' answers to a structured interview after the scoring experiment. The results reveal no obvious differences between the two devices in the scoring accuracy or average scoring time per essay, which suggests that scoring on an iPad may not reduce scoring quality or scoring productivity for essays that are holistically scored as compared to scoring the essays on a desktop computer. We also found a few iPad‐specific issues that raters reported, including issues associated with the invisible scrolling bar and the extra scrolling needed to reach the score‐assignment panel, difficulty navigating between the prompt and the essay response, and oversensitivity of the touch screen. [ABSTRACT FROM AUTHOR]

Copyright of Harran University Journal of the Faculty of Veterinary Medicine / Harran Üniversitesi Veteriner Fakültesi Dergisi is the property of Harran University, Faculty of Veterinary Medicine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Business process modeling is an important activity for developing software systems—especially within digitization projects and when realizing digital business models. Specifying requirements and building executable workflows is often done by using BPMN 2.0 process models. Although there are several style guides available for BPMN, e.g., by Silver and Richard (BPMN method and style, vol 2, Cody-Cassidy Press, Aptos, 2009), there has not been much empirical research done into the consequences of the diagram layout. In particular, layouts that require scrolling have not been investigated yet. The aim of this research is to establish layout guidelines for business process modeling that help business process modelers to create more understandable business process diagrams. For establishing benefits and penalties of different layouts, a controlled eye tracking experiment was conducted, in which data of 21 professional software developers was used. Our results show that horizontal layouts are less demanding and that as many diagram elements as possible should be put on the initially visible screen area because such diagram elements are viewed more often and longer. Additionally, diagram elements related to the reader's task are read more often than those not relevant to the task. BPMN modelers should favor a horizontal layout and use a more complex snake or multi-line layout whenever the diagrams are too large to fit on one page in order to support BPMN model comprehension. [ABSTRACT FROM AUTHOR]

Social media fuel a sense of unsettledness to encourage uninterrupted connectivity and generate quantifiable engagement. This article is concerned with the habitual, naturalized character acquired by these platforms and with how this is paradoxically constructed by prompting a permanent state of anticipation. The aim here is to explore, with a phenomenological sensibility, the experiences that emerge in settings of continuous connectedness from the perspective of the people who use these technologies in the context of everyday life – that is, the 'users'. Theoretically, the entry point is to revisit the claim of liveness – and its shifting relations with issues of sequential flow and eventfulness – and to position it as a central resource in this process, in which users are deliberately encouraged to expect the unexpected even in 'non-eventful' situations. Drawing from the thematic analysis of data collected through the diary-interview method with people who live in London and use a range of social media, I examine both how this urge of continuous connectedness operates and the ambivalent experiences it generates. The findings were categorized into five themes: excitement, anxiety, reassurance, fatigue, and responsibility. [ABSTRACT FROM AUTHOR]

Background: Scrolling is a perceived barrier in the use of bring your own device (BYOD) to capture electronic patient reported outcomes (ePROs). This study explored the impact of scrolling on the measurement equivalence of electronic patient-reported outcome measures (ePROMs) in the presence and absence of scrolling. Methods: Adult participants with a chronic condition involving daily pain completed ePROMs on four devices with different scrolling properties: a large provisioned device not requiring scrolling; two provisioned devices requiring scrolling – one with a "smart-scrolling" feature that disabled the "next" button until all information was viewed, and a second without this feature; and BYOD with smart-scrolling. The ePROMs included were the SF-12, EQ-5D-5L, and three pain measures: a visual analogue scale, a numeric response scale and a Likert scale. Participants completed English or Spanish versions according to their first language. Associations between ePROM scores were assessed using intraclass correlation coefficients (ICCs), with lower bound of 95% confidence interval (CI) > 0.7 indicating comparability. Results: One hundred fifteen English- or Spanish-speaking participants (21-75y) completed all four administrations. High associations between scrolling and non-scrolling were observed (ICCs: 0.71–0.96). The equivalence threshold was met for all but one SF-12 domain score (bodily pain; lower 95% CI: 0.65) and two EQ-5D-5L item scores (pain/discomfort, usual activities; lower 95% CI: 0.64/0.67). Age, language, and device size produced insignificant differences in scores. Conclusions: The measurement properties of PROMs are preserved even in the presence of scrolling on a handheld device. Further studies that assess scrolling impact over long-term, repeated use are recommended. [ABSTRACT FROM AUTHOR]

In this paper, we investigated the touch gestures of the scroll direction of a small and long UI due to the characteristics of a device in a smartphone environment that has become popular and used. Touch gestures are touched and directed by triggers such as metaphors and affordances based on past experiences. Different types of touch gestures are used depending on the type of navigation, motion, and transformation gesture, but scrolling is the most frequently used among them. In general, the scroll is vertically scrolled, but recently, a design pattern that can be scrolled left and right inside is arranged to cause cognitive dissonance of users. In the use of an inner scroll that can scroll left and right by covering a part of the right content, the mixing of a non-scrollable design pattern becomes a factor that requires attention to the user. Therefore, it was found that the use of triggers and the use of consistent design patterns can enhance the user experience even in the inner scroll environment. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Mu'tah Lil-Buḥūth wad-Dirāsāt: Humanities & Social Sciences Series is the property of Mutah University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

There is some evidence that a scrolling design may reduce breakoffs in mobile web surveys compared to a paging design, but there is little empirical evidence to guide the choice of the optimal number of items per page. We investigate the effect of the number of items presented on a page on data quality in two types of questionnaires: with or without user-controlled skips. Three versions of a 30-item instrument were compared, with 5, 15, or all 30 questions presented on a page, in two different surveys, one with skips and one without. We found that displaying 30 items on a page reduced the breakoff rate by almost one-third compared to presenting five items per page in the questionnaire without skips, but the difference was not statistically significant. In both surveys with and without skips, the completion times were significantly lower in the 30-item per page condition; however, item nonresponse rates were also higher. We give some practical recommendations to guide choices while designing questionnaires for mobile web surveys. [ABSTRACT FROM AUTHOR]

The present study investigated, whether word width and length affect the optimal character size for reading of horizontally scrolling Japanese words, using reading speed as a measure. In Experiment 1, three Japanese words, each consisting of four Hiragana characters, sequentially scrolled on a display screen from right to left. Participants, all Japanese native speakers, were instructed to read the words aloud as accurately as possible, irrespective of their order within the sequence. To quantitatively measure their reading performance, we used rapid serial visual presentation paradigm, where the scrolling rate was increased until the participants began to make mistakes. Thus, the highest scrolling rate at which the participants' performance exceeded 88.9% correct rate was calculated for each character size (0.3°, 0.6°, 1.0°, and 3.0°) and scroll window size (5 or 10 character spaces). Results showed that the reading performance was highest in the range of 0.6° to 1.0°, irrespective of the scroll window size. Experiment 2 investigated whether the optimal character size observed in Experiment 1 was applicable for any word width and word length (i.e., the number of characters in a word). Results showed that reading speeds were slower for longer than shorter words and the word width of 3.6° was optimal among the word lengths tested (three, four, and six character words). Considering that character size varied depending on word width and word length in the present study, this means that the optimal character size can be changed by word width and word length in scrolling Japanese words. [ABSTRACT FROM AUTHOR]

In public display contexts, interactions are spontaneous and have to work without preparation. We propose gaze as a modality for such contexts, as gaze is always at the ready, and a natural indicator of the user's interest. We present GazeHorizon, a system that demonstrates spontaneous gaze interaction, enabling users to walk up to a display and navigate content using their eyes only. GazeHorizon is extemporaneous and optimised for instantaneous usability by any user without prior configuration, calibration or training. The system provides interactive assistance to bootstrap gaze interaction with unaware users, employs a single off-the-shelf web camera and computer vision for person-independent tracking of the horizontal gaze direction and maps this input to rate-controlled navigation of horizontally arranged content. We have evaluated GazeHorizon through a series of field studies, culminating in a 4-day deployment in a public environment during which over a hundred passers-by interacted with it, unprompted and unassisted. We realised that since eye movements are subtle, users cannot learn gaze interaction from only observing others and as a result guidance is required. [ABSTRACT FROM AUTHOR]

The analysis presented in this paper is the search for optimal scrolling speeds of the user interface for interactive TV (iTV) navigation. The most popular navigation techniques for browsing through user interfaces usually incorporate scrolling. Furthermore, the latest set-top-boxes have enough processing power to support very fast scrolling, not only for texts, but also for photographs and other elements. We designed and performed an experiment to measure the optimal scrolling speed for different activities on a user interface. We found that the optimal speed depends on the type and complexity of the navigational elements (like text or graphics). We discovered that less-complex elements, such as numbered TV-channel names, tolerate much higher scrolling speeds than more-complex elements, such as graphical elements like movie posters. We also analyzed the impact of the direction of navigation (vertical, horizontal) on the optimal speeds and the results show no major impact on the graphical elements, while for the text elements the difference is obvious. The results of this study can improve the usability of the horizontal and vertical navigation techniques in modern iTV navigation. [ABSTRACT FROM AUTHOR]

Web form has become a critical component for many Web applications and services. Previous research has investigated into the general design of web form layout without examining the impact of variations in format, length and structure on user experience. This study explores users' preference and performance over Web forms of different lengths deployed on an employment site. Three types of design of Web forms were developed as the experiment instruments for 48 participants to test and evaluate. Results show that participants' preferences and satisfaction varied by the length of Web forms. Participants' preferences were also affected by their previous Internet experiences with job websites. In the end, recommendations for design principles for Web forms used for job sites were presented. [ABSTRACT FROM AUTHOR]

The article presents a study on the effects of three display screen size factors which are line length, line spacing, and line number on proofreading Chinese language text accurately and quickly. The study found that line number and line spacing affect proofreading time and detection rate and that line length and line number affect the amount of scrolling on the computer monitor. Topics include computer fonts, Chinese characters, and electronic records.

This article focuses on the pendulum-like change in the way people read and use text, which was triggered by the introduction of new reading and writing technologies in human history. The paper argues that textual features, which characterized the ancient pre-print writing culture, disappeared with the establishment of the modern-day print culture and has been “revived” in the digital post-modern era. This claim is based on the analysis of four cases which demonstrate this textual-pendulum swing: (1) The swing from concrete iconic-graphic representation of letters and words in the ancient alphabet to abstract phonetic representation of text in modern eras, and from written abstract computer commands “back” to the concrete iconic representation in graphic user interfaces of the digital era; (2) The swing from scroll reading in the pre-print era to page or book reading in the print era and “back” to scroll reading in the digital era; (3) The swing from a low level of authorship in the pre-print era to a strong authorship perception in the print era, and “back” to a low degree of authorship in the digital era; (4) The swing from synchronic representation of text in both visual and audio formats during the pre-print era to a visual representation only in print, and “back” to a synchronic representation in many environments of the digital era. We suggest that the print culture, which is usually considered the natural and preferred textual environment, should be regarded as the exception. [ABSTRACT FROM AUTHOR]

The article presents a study which examines the association between scrolling, negotiated interaction, and self-initiated self-repair (SISR) in a task-based synchronous computer-mediated communication (SCMC) foreign language learning environment. The study observes pairs of adult learners of German language. Researchers found that in a SCMC environment learners engage in more SISR of grammatical aspects of their own output than lexical aspects.

This paper investigates the propagation of estimation errors through a common coning, sculling, and scrolling architecture used in modern-day inertial navigation systems. Coning, sculling, and scrolling corrections often have an unaccounted for effect on the error statistics of inertial measurements used to describe the state and uncertainty propagation for position, velocity, and attitude estimates. Through the development of an error analysis for a set of coning, sculling, and scrolling algorithms, mappings of the measurement and estimation errors through the correction term are adaptively generated. Using the developed mappings, an efficient and consistent propagation of the state and uncertainty, within the multiplicative extended Kalman filter architecture, is achieved. Monte Carlo analysis is performed, and results show that the developed system has favorable attributes when compared to the traditional mechanization. [ABSTRACT FROM AUTHOR]

Mobile devices with limited interaction controls often employ cyclic scrolling for retrieval tasks. In this paper the scrolling behaviour of users entering text using a tree-key input technique based on two-phase cyclic character scrolling is studied. The results show that users have a tendency to scroll more from left-to-right than from right-to-left. However, users do also use the right-to-left functionality to both speed up their text entry task by choosing the shortest path and to make navigational corrections, suggesting that it is appropriate to provide bidirectional scrolling functionality in user interfaces on constrained mobile devices. In situations where a device architect is constrained to providing only unidirectional scrolling, the results suggest that a right-directional design is preferred over a left-directional design. [ABSTRACT FROM AUTHOR]

Text elision is a user interface technique that aims to improve the efficiency of navigating through information by allowing regions of text to be ‘folded’ into and out of the display. Several researchers have argued that elision interfaces are particularly suited to source code editing because they allow programmers to focus on relevant code regions while suppressing the display of irrelevant information. Elision features are now appearing in commercial systems for software development. There is, however, a lack of empirical evidence of the technique''s efficiency. This paper presents an empirical evaluation of source code elision using a Java program editor. The evaluation compared a normal ‘flat text’ editor with two versions that diminished elided text to levels that were ‘just legible’ and ‘illegible’. Performance was recorded in four tasks involving navigation through programs. Results show that programmers were able to complete their tasks more rapidly when using the elision interfaces, particularly in larger program files. Although several participants indicated a preference for the just legible elision interface, performance was best with illegible elision. [Copyright &y& Elsevier]

One of the major sources of power drain in smartphones is a frame rendering and display process called graphics pipeline, in which power consumption depends largely on frame rendering operations per second (fps), known as the frame rate, and the quantity of UI content to be rendered. We discovered a major problem causing power consumption upon a scrolling operation: The Android graphics pipeline renders all or a large portion of the content displayed most recently at a frame rate of nearly 60 fps. This paper proposes a scrolling-aware rendering (SCAR) scheme to reduce the frame rate caused by a scrolling. When rendering a frame for UI content to be displayed, SCAR pre-renders UI content that is likely to be displayed soon in any subsequent scrolling operation. This frame is extended to place the pre-rendered UI content contiguously with the UI content to be displayed. Upon a subsequent scrolling, SCAR repositions the extended frame on screen by a scrolling distance instead of rendering a new frame. Our experiments on a smartphone show that SCAR reduced frame rates to below one fps in scrolling, thus saving power by up to 30%. [ABSTRACT FROM AUTHOR]