情報処理学会 インタラクション 図 1: Flickey のプロトタイプと比較対象 a Flickey b ZoomBoard c ZShift d Flickey および 10 円玉 直径 20 mm との比較 Fig. 1 The prototype of Flickey and other k
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1 Flickey QWERTY 1,a) 2,b) 3,c) 3,d) QWERTY QWERTY Flickey Flickey Flickey Flickey 16.5 mm Flickey Flickey Flickey: A Flick-based QWERTY Software Keyboard for Ultra-small Touch Screen Devices Akira Ishii 1,a) Hiroyuki Hakoda 2,b) Buntarou Shizuki 3,c) Jiro Tanaka 3,d) Abstract: Ultra-small touch screen devices (e.g., smartwatch) are required to be small and light weight so that it could be worn on body with no frustration. For this reason, users often have difficulties selecting accurate keys and entering texts. To address this problem, we present Flickey, a flick-based QWERTY software keyboard for ultra-small touch screen devices. Users who use Flickey can easily select keys in small-size keyboard because users can select keys by flick. To investigate usability of Flickey, we developed a prototype of Flickey and conducted a comparative experiment between several existing text entry methods. As a result, with the keyboard size of 16.5 mm, text entry speed of Flickey was the fastest (non-significant), and it suggested that Flickey was useful in ultra-small touch screen devices. Furthermore, we found many potential improvements from the experiment. 1 College of Media Arts Science and Technology, School of Informatics, University of Tsukuba 2 Department of Computer Science, Graduate School of Systems and Information Engineering, University of Tsukuba 3 Faculty of Engineering, Information and Systems, University of Tsukuba a) ishii@iplab.cs.tsukuba.ac.jp b) hakoda@iplab.cs.tsukuba.ac.jp c) shizuki@cs.tsukuba.ac.jp d) jiro@cs.tsukuba.ac.jp 1. Processing Society of Japan 80
![文字入力の性能を向上させることは大きな課題である フリックにより選択し その後もう一度フリックすること この課題に対して 特に 多くのユーザが慣れ親しん によりキーを選択する 同様に SplitBoard [5] を用いる でいる QWERTY 配列のソフトウェアキーボード 以降 ユーザは 複数の領域に分けられたキーボードを スワイ QWERTY キーボード を超小型端末においても使えれば](/docs-images/92/108607036/images/2-1.jpg "プ動作によって切り替える Komninos ら [6] はキーボー 好都合であるが 多くのキーから成る QWERTY キーボー ドレイアウトを変更し キーを 6 つの領域に分けることに ド全体をタッチスクリーン内に収まるように表示すると より超小型端末においても操作可能なキーボードを提案 キーサイズがユーザの指より小さくなるため ユーザは している 原ら [7] は")
![スクロールの変位量に応じてキー キーを押し分けることが困難となる [1] ボードが自動的にズームするキーボードを提案している そこで我々は フリックを活用した QWERTY キーボー ただし これらのキーボードにおいては ユーザがタッチ ド Flickey フリッキー を考案した 図 1a Flickey する度にキーボードが拡大または移動するため レイアウ](/docs-images/92/108607036/images/2-2.jpg "においてはキーを選択する操作としてフリックを採用し トの変化が頻繁に発生する た これにより ユーザはキーを押し分けずに済むので Leiva らの QWERTY キーボード [3] は 押下した指に 小さいサイズのキーボードにおいてもキーの選択が容易で よって遮蔽されているキーを画面上部にふきだし表示する ある 今回我々は Flickey の性能を評価するため 先行研 ことにより")
![超小型端末における文字入力を可能としてい 究である ZoomBoard [2] および ZShift [3] との比較実験を る 我々の Flickey においても 押下されているキーとそ 行い 文字入力性能 エラー率 および主観的評価の検証 の周辺のキーをキーボード上部に表示することにより 指 を行った 本稿においては これらについて報告する](/docs-images/92/108607036/images/2-3.jpg "によってキーボード本体が遮蔽されていても文字入力を可 2. 関連研究 本稿において示す Flickey は 超小型端末におけるフリッ 能とする ふきだし表示を用いることにより キーボード のレイアウトを変更することなく超小型端末においても キー入力が可能となる クを活用した QWERTY キーボードである したがって 超小型タッチパネル端末における文字入力手法に関する研 2.")
2 情報処理学会 インタラクション 図 1: Flickey のプロトタイプと比較対象 a Flickey b ZoomBoard c ZShift d Flickey および 10 円玉 直径 20 mm との比較 Fig. 1 The prototype of Flickey and other keyboards used in our experiment. a) Flickey, b) ZoomBoard, c) ZShift, and d) Flickey compared with a 10 JPY coin (diameter: 20 mm). 文字入力の性能を向上させることは大きな課題である フリックにより選択し その後もう一度フリックすること この課題に対して 特に 多くのユーザが慣れ親しん によりキーを選択する 同様に SplitBoard [5] を用いる でいる QWERTY 配列のソフトウェアキーボード 以降 ユーザは 複数の領域に分けられたキーボードを スワイ QWERTY キーボード を超小型端末においても使えれば プ動作によって切り替える Komninos ら [6] はキーボー 好都合であるが 多くのキーから成る QWERTY キーボー ドレイアウトを変更し キーを 6 つの領域に分けることに ド全体をタッチスクリーン内に収まるように表示すると より超小型端末においても操作可能なキーボードを提案 キーサイズがユーザの指より小さくなるため ユーザは している 原ら [7] は スクロールの変位量に応じてキー キーを押し分けることが困難となる [1] ボードが自動的にズームするキーボードを提案している そこで我々は フリックを活用した QWERTY キーボー ただし これらのキーボードにおいては ユーザがタッチ ド Flickey フリッキー を考案した 図 1a Flickey する度にキーボードが拡大または移動するため レイアウ においてはキーを選択する操作としてフリックを採用し トの変化が頻繁に発生する た これにより ユーザはキーを押し分けずに済むので Leiva らの QWERTY キーボード [3] は 押下した指に 小さいサイズのキーボードにおいてもキーの選択が容易で よって遮蔽されているキーを画面上部にふきだし表示する ある 今回我々は Flickey の性能を評価するため 先行研 ことにより 超小型端末における文字入力を可能としてい 究である ZoomBoard [2] および ZShift [3] との比較実験を る 我々の Flickey においても 押下されているキーとそ 行い 文字入力性能 エラー率 および主観的評価の検証 の周辺のキーをキーボード上部に表示することにより 指 を行った 本稿においては これらについて報告する によってキーボード本体が遮蔽されていても文字入力を可 2. 関連研究 本稿において示す Flickey は 超小型端末におけるフリッ 能とする ふきだし表示を用いることにより キーボード のレイアウトを変更することなく超小型端末においても キー入力が可能となる クを活用した QWERTY キーボードである したがって 超小型タッチパネル端末における文字入力手法に関する研 2.2 タッチジェスチャを活用したソフトウェアキーボード 究 およびフリックなどのタッチジェスチャを活用したソ ソフトウェアキーボードにおけるタッチジェスチャに フトウェアキーボードに関する研究と Flickey との位置づ よる文字入力手法は数多く提案されている Graffiti [8] けを述べる Unistroke [9] および EdgeWrite [10] は 1 ストロークで 入力可能なアルファベットを模したジェスチャ入力手法で 2.1 超小型端末における QWERTY キーボード ある 金井ら [11] は 1 ストロークで書くことができるス 超小型端末用の QWERTY キーボードが幾つか提案され トロークを連続入力することにより 文字入力を行う手法 ている ZoomBoard [2] を用いるユーザは キーボード上 を提案している Quikwriting [12] はキーを 9 つの領域に の大まかな位置をタップにより拡大し その後もう一度目 分割表示し それらを特定の規則にそって ドラッグする 的のキーをタップする これにより ユーザは小さなキー ことによって文字入力を実現している No-look Flick [13] を確実にタップすることが可能となる Swipeboard [4] を や下岡ら [14] は 段階的な 4 方向へのフリックによって 用いるユーザは 9 つのグループに分かれたキーを 9 方向 アイズフリーなひらがな入力を実現している 同様に Processing Society of Japan 81
![flick-up/down to enter a character. Drag&Flick [15] 8 Flickey 3.](/docs-images/92/108607036/images/3-1.jpg "QWERTY Flickey ZShift [3] QWERTY Flickey ZoomBoard ZShift Flickey ZoomBoard ZShift Flickey")
3 2: Flickey a b cd Fig. 2 Text entry flow on Flickey. a) Initial state, b) Touch-down, c) Drag to select a key row, and d) Touch-up or flick-up/down to enter a character. Drag&Flick [15] 8 Flickey 3. QWERTY Flickey ZShift [3] QWERTY Flickey ZoomBoard ZShift Flickey ZoomBoard ZShift Flickey QWERTY 3.2 ZShift ios QWERTY QWERTY ZShift Shift [17] ZShift Shift Zoomed Shift technique ZShift 1c 3.1 ZoomBoard ZoomBoard TapTap [16] 1b ZoomBoard Fat Finger [1] 3.3 Flickey Flickey ZShift [3] QWERTY Flickey 2 Flickey 2 2b 2d Processing Society of Japan 82
![2c X Y Flickey 1a 3: Fig. 3 The smartphone attached in landscape orientation to the non-dominant hand. 3.4 H [2,3,18,19] ZoomBoard ZShift Flickey H s k w H 2 h 4.](/docs-images/92/108607036/images/4-0.jpg "Flickey ZoomBoard ZShift *1 3 3 small 16.5 mm medium 22 mm large 29.3 mm 9 3 4.1 iphone 5 ios 8.")
4 2c X Y Flickey 1a 3: Fig. 3 The smartphone attached in landscape orientation to the non-dominant hand. 3.4 H [2,3,18,19] ZoomBoard ZShift Flickey H s k w H 2 h 4. Flickey ZoomBoard ZShift *1 3 3 small 16.5 mm medium 22 mm large 29.3 mm iphone 5 ios inch326 ppi 3 2 D&M 842XUD2786 BLK M *1 width height Samsung Gear Fit mm Apple Watch (38 mm) mm Apple Watch (42 mm) mm [mm] H w h s k small medium large : Fig. 4 The layout of the keyboards used in the experiment. 4.2 ios 1 4 ZoomBoard [2] 16.5 mm Leiva [3] small 1.00 medium 1.33 large 1.77 QWERTY small iphone inch QWERTY d Processing Society of Japan 83
![4.3 5 4 1 21 22 29 67 53 3 1 1 2 QWERTY 1 1 3 1 QWERTY 1 ATOK [20] QWERTY 125 213 171 1,640 4.4 5 14.3 mm SD = 0.8 mm [21] 3 medium taro tsukuba taro 6 5: Fig.](/docs-images/92/108607036/images/5-0.jpg "5 Measurement position of index finger.")
5 QWERTY QWERTY 1 ATOK [20] QWERTY , mm SD = 0.8 mm [21] 3 medium taro tsukuba taro 6 5: Fig. 5 Measurement position of index finger MacKenzie [22] System Usability Scale SUS [23,24] NASA Task Load Index NASA-TLX [25] SUS NASA-TLX SUS [26] 1 SUS Processing Society of Japan 84
6 1: SUS Table 1 The Japanese version of SUS. (1) I think that I would like to use this system frequently. (2) I found the system unnecessarily complex. (3) I thought the system was easy to use. (4) I think that I would need the support of a technical person to be able to use this system. (5) I found the various functions in this system were well integrated. (6) I thought there was too much inconsistency in this system. (7) I would imagine that most people would learn to use this system very quickly. (8) I found the system very cumbersome to use. (9) I felt very confident using the system. (10) I needed to learn a lot of things before I could get going with this system. 1 9 NASA-TLX [27] Words Per Minute, WPM [28] 2 6 Tukey s HSD small ZoomBoard ZShift p <.05 ZoomBoard Flickey p <.01 2: WPM Table 2 Text entry speed (WPM). small 7.5 (0.3) 8.5 (0.7) 8.7 (0.3) medium 8.7 (0.5) 10.1 (0.4) 9.4 (0.5) large 8.9 (0.2) 12.4 (0.5) 8.8 (0.9) medium ZoomBoard ZShift p <.001 large ZoomBoard ZShift p <.001 ZShift Flickey p <.001 small ZoomBoard ZShift Flickey medium ZoomBoard ZShift large ZShift Flickey small large large Flickey Flickey Character Error Rate CER CER [3] CER 3 CER small small Tukey s HSDZShift Flickey p <.001 ZShift ZoomBoard p <.001 ZShift small CER CER Corrected error rate, Cerr Processing Society of Japan 85
7 small medium large WPM ZoomBoard ZShift Flickey 試行 6: WPM Fig. 6 Text entry speed (WPM). 3: CER Table 3 Error rate (CER). small 0.00% (0.00) 0.55% (0.31) 0.00% (0.00) medium 0.64% (1.42) 0.41% (0.64) 0.00% (0.00) large 0.00% (0.00) 0.29% (0.64) 0.26% (0.36) : Cerr Table 4 Corrected error rate (Cerr). small 4.59% (3.28) 5.53% (1.94) 9.47% (5.15) medium 4.70% (3.68) 8.95% (3.66) 10.01% (3.71) large 2.01% (1.89) 6.52% (4.99) 9.48% (3.44) [29] 4 Cerr large large Tukey s HSD ZoomBoard Flickey p <.05 Flickey ZoomBoard large Cerr Uncorrected error rate, UCerr 5 UCerr small small Tukey s HSDZShift Flickey p <.001 ZShift ZoomBoard p <.01 ZShift small UCerr Flickey 1 ZShift Flickey 5: UCerr Table 5 Uncorrected error rate (UCerr). small 0.00% (0.00) 0.47% (0.27) 0.00% (0.00) medium 0.64% (1.44) 0.39% (0.62) 0.00% (0.00) large 0.00% (0.00) 0.26% (0.59) 0.23% (0.32) Flickey 4.4 Cerr ρ =.906 p <.05 ZoomBoard large Cerr ρ =.952 p <.05 Fat Finger [1] 5.2 SUS 6 SUS small medium large large Tukey s HSD
8 TLX ZoomBoard ZShift Flickey Fig. 7 7: 6 NASA-TLX Results of each of the six NASA-TLX dimensions. 6: SUS Table 6 Usability of each condition (SUS). small 66.0 (13.3) 60.0 (15.2) 59.0 (12.9) medium 72.0 (11.4) 69.5 (14.1) 62.0 (10.8) large 69.5 (17.0) 81.5 (11.8) 54.0 (9.8) : NASA-TLX Table 7 Workload of each condition (NASA-TLX). small 36.4 (24.9) 32.5 (19.7) 37.3 (21.3) medium 40.2 (22.1) 34.7 (25.2) 41.9 (19.8) large 33.7 (13.7) 27.6 (24.1) 49.0 (21.9) ZShift Flickey p <.05 large Flickey ZShift NASA-TLX 7 7 NASA-TLX ZShift SUS QWERTY large ZoomBoard 2 SUS NASA-TLX 2 Flickey large small SUS NASA-TLX large Flickey small 6. QWERTY Flickey small Flickey ZoomBoard 7.5 WPM ZShift 8.5 WPM Flickey 8.7 WPM Flickey Flickey [1] Siek, K. A., Rogers, Y. and Connelly, K. H.: Fat Finger Worries: How Older and Younger Users Physically Interact with PDAs, in Proceedings of the 2005 IFIP TC13 International Conference on Human-Computer Interaction, INTERACT 05, pp , Berlin, Heidelberg (2005), Springer-Verlag. [2] Oney, S., Harrison, C., Ogan, A. and Wiese, J.: Zoom- Board: A Diminutive Qwerty Soft Keyboard using Iterative Zooming for Ultra-small Devices, in Proceedings of the SIGCHI Conference on Human Factors in Computing Systems, CHI 13, pp , New York, NY, USA (2013), ACM. [3] Leiva, L. A., Sahami, A., Catala, A., Henze, N. and Schmidt, A.: Text Entry on Tiny QWERTY Soft Keyboards, in Proceedings of the 33rd Annual ACM Conference on Human Factors in Computing Systems, CHI 15, pp , New York, NY, USA (2015), ACM. [4] Chen, X. A., Grossman, T. and Fitzmaurice, G.: Swipeboard: A Text Entry Technique for Ultra-small Interfaces That Supports Novice to Expert Transitions, in Proceedings of the 27th Annual ACM Symposium on User Interface Software and Technology, UIST 14, pp , New York, NY, USA (2014), ACM.
9 [5] Hong, J., Heo, S., Isokoski, P. and Lee, G.: SplitBoard: A Simple Split Soft Keyboard for Wristwatch-sized Touch Screens, in Proceedings of the 33rd Annual ACM Conference on Human Factors in Computing Systems, CHI 15, pp , New York, NY, USA (2015), ACM. [6] Komninos, A. and Dunlop, M.: Text Input on a Smart Watch, Pervasive Computing, IEEE, Vol. 13, No. 4, pp (2014). [7],,, 2014, pp , (2014). [8] MacKenzie, I. S. and Zhang, S. X.: The Immediate Usability of Graffiti, in Proceedings of the Conference on Graphics Interface 97, pp , Canadian Information Processing Society (1997). [9] Goldberg, D. and Richardson, C.: Touch-typing with a Stylus, in Proceedings of the INTERACT 93 and CHI 93 Conference on Human Factors in Computing Systems, INTERACT 93 and CHI 93, pp , New York, NY, USA (1993), ACM. [10] Wobbrock, J. O., Myers, B. A. and Kembel, J. A.: EdgeWrite: A Stylus-based Text Entry Method Designed for High Accuracy and Stability of Motion, in Proceedings of the 16th Annual ACM Symposium on User Interface Software and Technology, UIST 03, pp , New York, NY, USA (2003), ACM. [11],, 22, WISS2014, pp , (2014). [12] Perlin, K.: Quikwriting: Continuous Stylus-based Text Entry, in Proceedings of the 11th Annual ACM Symposium on User Interface Software and Technology, UIST 98, pp , New York, NY, USA (1998), ACM. [13] Fukatsu, Y., Shizuki, B. and Tanaka, J.: No-look Flick: Single-handed and Eyes-free Japanese Text Input System on Touch Screens of Mobile Devices, in Proceedings of the 15th International Conference on Human-computer Interaction with Mobile Devices and Services, Mobile- HCI 13, pp , New York, NY, USA (2013), ACM. [14],,, 23, WISS2015, pp , (2015). [15],,,,,, Drag&Flick:, 2013, pp , (2013). [16] Roudaut, A., Huot, S. and Lecolinet, E.: TapTap and MagStick: Improving One-handed Target Acquisition on Small Touch-screens, in Proceedings of the Working Conference on Advanced Visual Interfaces, AVI 08, pp , New York, NY, USA (2008), ACM. [17] Vogel, D. and Baudisch, P.: Shift: A Technique for Operating Pen-based Interfaces using Touch, in Proceedings of the SIGCHI Conference on Human Factors in Computing Systems, CHI 07, pp , New York, NY, USA (2007), ACM. [18] Findlater, L., Wobbrock, J. O. and Wigdor, D.: Typing on Flat Glass: Examining Ten-finger Expert Typing Patterns on Touch Surfaces, in Proceedings of the SIGCHI Conference on Human Factors in Computing Systems, CHI 11, pp , New York, NY, USA (2011), ACM. [19] Li, F. C. Y., Guy, R. T., Yatani, K. and Truong, K. N.: The 1Line Keyboard: A QWERTY Layout in a Single Line, in Proceedings of the 24th Annual ACM Symposium on User Interface Software and Technology, UIST 11, pp , New York, NY, USA (2011), ACM. [20] ATOK for Android, jp/products/atok_android/ [21] AIST, [22] MacKenzie, I. S. and Soukoreff, R. W.: Phrase Sets for Evaluating Text Entry Techniques, in CHI 03 Extended Abstracts on Human Factors in Computing Systems, CHI EA 03, pp , New York, NY, USA (2003), ACM. [23] Brooke, J.: SUS: A Quick and Dirty Usability Scale, Usability Evaluation in Industry (1996). [24] Brooke, J.: SUS: A Retrospective, J. Usability Studies, Vol. 8, No. 2, pp (2013). [25] Hart, S. G. and Staveland, L. E.: Development of NASA- TLX (Task Load Index): Results of Empirical and Theoretical Research, Human mental workload, Vol. 1, No. 3, pp (1988). [26],,, 2014, 8 pages (2014). [27],,, Vol. 29, No. 6, pp (1993). [28] Arif, A. S. and Stuerzlinger, W.: Analysis of Text Entry Performance Metrics, in Proceedings of the IEEE Toronto International Conference on Science and Technology for Humanity, pp , IEEE (2009). [29] Soukoreff, R. W. and MacKenzie, I. S.: Metrics for Text Entry Research: An Evaluation of MSD and KSPC, and a New Unified Error Metric, in Proceedings of the SIGCHI Conference on Human Factors in Computing Systems, CHI 03, pp , New York, NY, USA (2003), ACM. Processing Society of Japan 88
情報処理学会研究報告 図 1: 作成したプロトタイプ a) 10 円玉との比較 b) ZoomBoard c) ZShift d) Flickey Fig. 1 Our prototypes. a) Compared with a 10 YEN coin. b) ZoomBoard, c) ZShi
Flickey: QWERTY 1,a) 2 3 3 QWERTY QWERTY QWERTY Flickey Flickey Flickey Flickey 16.5 mm Flickey 1. [1] QWERTY Flickey 1d Flickey Flickey ZoomBoard 1 College of Media, Arts, Science and Technology, School
超小型タッチスクリーン端末におけるフリックに基つくQWERTYキーホード
QWERTY 2016 1 QWERTY QWERTY FlickeyFlickey Flickey Flickey 16.5 mm Flickey Flickey Flickey 1 1 1.1........................................ 1 1.2................................. 1 1.3........................................
325 In this research, we created smartphone cases attaching a dimple or a wedge shaped object in order to improve eyes-free and single-handed touch ac
325 In this research, we created smartphone cases attaching a dimple or a wedge shaped object in order to improve eyes-free and single-handed touch accuracy. We considered that users could use these dimple
3.1 Thalmic Lab Myo * Bluetooth PC Myo 8 RMS RMS t RMS(t) i (i = 1, 2,, 8) 8 SVM libsvm *2 ν-svm 1 Myo 2 8 RMS 3.2 Myo (Root
1,a) 2 2 1. 1 College of Information Science, School of Informatics, University of Tsukuba 2 Faculty of Engineering, Information and Systems, University of Tsukuba a) oharada@iplab.cs.tsukuba.ac.jp 2.
30 (2013 ) In this research, we created smartphone cases attaching a dimple or a wedge shaped object in order to improve eyes-free and single-handed t
30 (2013 ) In this research, we created smartphone cases attaching a dimple or a wedge shaped object in order to improve eyes-free and single-handed touch accuracy. We considered that users could use these
iphone4 ios 2. Sánchez [3] 9 text-to-speech Bonner [4] 8 ABC B iphone VoiceOver VoiceOver Frey [5] Braille iphone Braille
![iphone4 ios 2. Sánchez [3] 9 text-to-speech Bonner [4] 8 ABC B iphone VoiceOver VoiceOver Frey [5] Braille iphone Braille](/thumbs/93/113901830.jpg "iphone4 ios 2. Sánchez [3] 9 text-to-speech Bonner [4] 8 ABC B iphone VoiceOver VoiceOver Frey [5] Braille iphone Braille")
1,a) 2 2 2 3.5% 19.8% 9.8% One-hand and Eyes-free Text Input System on Touch Panel of Mobile Devices Yoshitomo Fukatsu 1,a) Buntarou Shizuki 2 Jiro Tanaka 2 Abstract: In this paper, we explain the kana
情報処理学会研究報告 図 1 不動カーソル領域 [6] より引用 図 2 DriftBoard [7] より引用 ポインティングの操作性能評価としては 代表的なもの に Fitts によって提唱された Fitts Law [5] がある 操作 性能を定式化することによって 定量的に性能を評価し かつ
![情報処理学会研究報告 図 1 不動カーソル領域 [6] より引用 図 2 DriftBoard [7] より引用 ポインティングの操作性能評価としては 代表的なもの に Fitts によって提唱された Fitts Law [5] がある 操作 性能を定式化することによって 定量的に性能を評価し かつ](/thumbs/86/94004206.jpg "情報処理学会研究報告 図 1 不動カーソル領域 [6] より引用 図 2 DriftBoard [7] より引用 ポインティングの操作性能評価としては 代表的なもの に Fitts によって提唱された Fitts Law [5] がある 操作 性能を定式化することによって 定量的に性能を評価し かつ")
Movable Background 1 1 Fat finger Movable Background Movable Background Movable Background Fitts Law Movable Background 2 Movable Background Evaluation of pointing performance on the Movable Background
IPSJ SIG Technical Report Vol.2013-HCI-154 No /8/5 2 1,a) [1] fat fingers problem [2] 2 Android University of Tsukuba a)
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The copyright of this material is retained by the Information Processing Society of Japan (IPSJ). The material has been made available on the website by the author(s) under the agreement with the IPSJ.
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