Session:「Typing & Touch 1」

Designing Coherent Gesture Sets for Multi-scale Navigation on Tabletops

論文URL: http://dl.acm.org/citation.cfm?doid=3173574.3173716

論文アブストラクト: Multi-scale navigation interfaces were originally designed to enable single users to explore large visual information spaces on desktop workstations. These interfaces can also be quite useful on tabletops. However, their adaptation to co-located multi-user contexts is not straightforward. The literature describes different interfaces, that only offer a limited subset of navigation actions. In this paper, we first identify a comprehensive set of actions to effectively support multi-scale navigation. We report on a guessability study in which we elicited user-defined gestures for triggering these actions, showing that there is no natural design solution, but that users heavily rely on the now-ubiquitous slide, pinch and turn gestures. We then propose two interface designs based on this set of three basic gestures: one involves two-hand variations on these gestures, the other combines them with widgets. A comparative study suggests that users can easily learn both, and that the gesture-based, visually-minimalist design is a viable option, that saves display space for other controls.

日本語のまとめ:

テーブルトップ上でマルチスケールナビゲーションを,複数人で利用することを想定したジェスチャセットを提案した.ユーザにジェスチャを提案させる実験を行った結果,現在普及している基本的なジェスチャの派生が多く見られた

Typing on an Invisible Keyboard

論文URL: http://dl.acm.org/citation.cfm?doid=3173574.3174013

論文アブストラクト: A virtual keyboard takes a large portion of precious screen real estate. We have investigated whether an invisible keyboard is a feasible design option, how to support it, and how well it performs. Our study showed users could correctly recall relative key positions even when keys were invisible, although with greater absolute errors and overlaps between neighboring keys. Our research also showed adapting the spatial model in decoding improved the invisible keyboard performance. This method increased the input speed by 11.5% over simply hiding the keyboard and using the default spatial model. Our 3-day multi-session user study showed typing on an invisible keyboard could reach a practical level of performance after only a few sessions of practice: the input speed increased from 31.3 WPM to 37.9 WPM after 20 - 25 minutes practice on each day in 3 days, approaching that of a regular visible keyboard (41.6 WPM). Overall, our investigation shows an invisible keyboard with adapted spatial model is a practical and promising interface option for the mobile text entry systems.

日本語のまとめ:

目に見えないキーボードについての調査。ユーザはQWERTY配列のキーの相対的な位置を記憶している。独自の空間モデルを適応することで、入力速度は11.5%向上した。3日間の調査後には37.9WPMに達した。

Storyboard-Based Empirical Modeling of Touch Interface Performance

論文URL: http://dl.acm.org/citation.cfm?doid=3173574.3174019

論文アブストラクト: Touch interactions are now ubiquitous, but few tools are available to help designers quickly prototype touch interfaces and predict their performance. For rapid prototyping, most applications only support visual design. For predictive modelling, tools such as CogTool generate performance predictions but do not represent touch actions natively and do not allow exploration of different usage contexts. To combine the benefits of rapid visual design tools with underlying predictive models, we developed the Storyboard Empirical Modelling tool (StEM) for exploring and predicting user performance with touch interfaces. StEM provides performance models for mainstream touch actions, based on a large corpus of realistic data. We evaluated StEM in an experiment and compared its predictions to empirical times for several scenarios. The study showed that our predictions are accurate (within 7% of empirical values on average), and that StEM correctly predicted differences between alternative designs. Our tool provides new capabilities for exploring and predicting touch performance, even in the early stages of design.

日本語のまとめ:

タッチインタフェースのプロトタイプからユーザパフォーマンスを予測するツールを開発し,実測値及び既存手法との比較実験を行った.予測モデルの構築のためには,主要なタッチ操作のログを記録するシステムを公開してデータを収集した.

Observations on Typing from 136 Million Keystrokes

論文URL: http://dl.acm.org/citation.cfm?doid=3173574.3174220

論文アブストラクト: We report on typing behaviour and performance of 168,000 volunteers in an online study. The large dataset allows detailed statistical analyses of keystroking patterns, linking them to typing performance. Besides reporting distributions and confirming some earlier findings, we report two new findings. First, letter pairs that are typed by different hands or fingers are more predictive of typing speed than, for example, letter repetitions. Second, rollover-typing, wherein the next key is pressed before the previous one is released, is sur- prisingly prevalent. Notwithstanding considerable variation in typing patterns, unsupervised clustering using normalised inter-key intervals reveals that most users can be divided into eight groups of typists that differ in performance, accuracy, hand and finger usage, and rollover. The code and dataset are released for scientific use.

日本語のまとめ:

オンライン上で16万8千人のタイピングのデータを収集した。タイピングが速い人は前のキーを離す前に次のキーを押すロールオーバーをよく用いる。また、ほとんどのユーザのタイピングパターンは8つに分類できることがわかった。