the symbol grounding problem *2 *3 2 *4 robot ethics (1) (2) (3) (1) (2) (3) (3) (2) (3) *2 Cf Taddeo and Floridi [16] *3 Cf. Clark [4, 5]

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2011 12 25 1 *1 robot ethics machine ethics aritificial morality 1. 2. 3. 1 2 3 SF Floridi and Sanders [6] moral patients Searle [13] Harnad [9] minao.kukita@gmail.com *1 1

the symbol grounding problem *2 *3 2 *4 robot ethics (1) (2) (3) (1) (2) (3) (3) (2) (3) *2 Cf. 1990 2005 Taddeo and Floridi [16] *3 Cf. Clark [4, 5] *4 18 http://www.ai-gakkai.or.jp/jsai/whatsai/pdf/rloadmap2.pdf 2

図 1 MedEthEx を組み込まれた 倫理的 ロボット NAO 図 2 MedEthEx の推論 くにつれて そのようなロボットの必要性はますます高まっていくだろう 実際 2007 年にジョージア工科 大学のロナルド アーキンは 戦時における倫理的基準に従うことができる戦闘ロボットのためのソフトウェ アとハードウェアの開発のために アメリカ陸軍からの資金を獲得している *5 そういった状況において機械 に 良い 選択をさせるためには 人間が良いと判断するような選択のための規則 そのような規則がある ものとして が 機械にも遂行できる形で与えられなければならない しかしながら人間にとってそのよう な規則はしばしば暗黙のうちに従われているものである 従って倫理的選択の状況で人間が従っている規則を 明示化することが 倫理的機械の実現への最初のチャレンジである マイケル アンダーソンとスーザン アンダーソンは 患者が薬を飲むことを拒否した時に介護士が迫られ る倫理的な選択 患者の意思を尊重して放っておくか 患者の身体的健康を重んじて医師に連絡をするか に対処するための人工知能システム MedEthEx を開発している 図 1 *6 このシステムには特に注目 するべき特徴が二つある 第一に このシステムは患者の感情と患者の健康という二つの価値を天秤にかけ て 特定の状況においてどちらを優先するべきかという 現実的な倫理的的問題に対して判断を下す能力を 持っているということである 第二に このシステムは機械学習を通じて 同じ状況において人間の介護士が 無意識に 従っている規則を発見することができるということである この際 MedEthEx は帰納論理プロ グラミング*7 という 個別事例から一般法則を導く人工知能のテクニックを用いている MedEthEx はその ようにして導きだした一般法則を個々の状況にあてはめて判断を下している 図 2 従って MedEthEx は *5 *6 Cf. Wallach and Allen [19], p. 21 Anderson and Anderson [1] *7 帰納論理プログラミングについては例えば Gillies [7] 古川 [21] などを参照 3

Web *8 the robot merely follows something that seems to be a simple rule set, not making true decisions by weighting the whole situation, since robot does not have situation awareness Michael Anderson is obviously a misguided fool and will be the first to die at the hands of an ethical robot. There are some things that only people can do that robots will never be able to do. The more we try to succeed in this technology, the more we are just trying to play the roll of God!! People need to [ ] do their own work, and stop trying to program robots to do the work for them, in an ethical way. Wallach and Allen [19], p. 14 3 Floridi and Sanders [6] observables responsibility responsibility accountability *8 http://news.discovery.com/tech/robot-makes-ethical-decisions.html 2011 2 4

p 1, p 2,..., p n T T (p 1, p 2,..., p n ) t T t 4 Floridi [6], p. 365 4.1 Turing [17] Searle [13] Winograd and Flores [20] 5

AI Harnad [9] AI SGP SGP *9 AI SGP SGP *9 SGP Cf. Brooks [2, 3], [22] 6

MEANING FORM SIGN REFERENT 3 Semiotic Triangle Vogt [18], p. 180, Figure 2 SGP AI Vogt sign semiosis 3 SGP Vogt Vogt [18], p. 180 Vogt semiotic symbols Vogt per definition Vogt Vogt [18]; Steels and Vogt [15] SGP 7

Steels [14] Taddeo and Floridi [16] SGP zero semantical commitment contition SGP Vogt Taddeo SGP Taddeo SGP SGP SGP SGP SGP 4.2 MedEthEx MedEthEx MedEthEx MedEthEx ESGP ESGP 8

4 KisMET ESGP 20 SGP Vogt SGP ESGP ESGP ESGP KisMET 4 WAMOEBA 5 * 10 MacLennan [10, 12, 11] Grim and Kokalis [8] synthetic ethology ESGP *10 [23] 9

5 WAMOEBA Google Google * 11 * 12 5 ESGP ESGP [1] M. Anderson and S. Anderson. Robot be good. Scientific American, October, 2010. [2] R. Brooks. A robust layered control system for a mobile robot. IEEE Journal of Robotics and Automation, (1):14 23, 1986. [3] R. Brooks. MIT., 2006. Flesh and Machines: How Robots Will Change Us, 2002. [4] A. Clark. Natural-Born Cyborgs: Minds, Technologies, and the Future of Human Intelligence. Oxford University Press, New York, 2003. [5] A. Clark and D. Chalmers. The extended mind. http://cogprints.org/320/1/extended.html. *11 *12 Cf. Clark [4], Clark and Chalmers [5]. 10

[6] L. Floridi and J. W. Sanders. On the morality of artificial agents. Minds and Machine, 14, 2004. [7] D. Gillies. Artificial Intelligence and Scientific Method. Oxford University Press, New York, 1999. [8] P. Grim and T. Kokalis. Environmental variability and the emergence of meaning: simulational studies across imitation, genetic algorithms, and neural networks. In Loula, Gudwin, and Queiroz, editors, Artificial Cognition Systems, pages 284 325. Idea Group Publishing, Hershey, 2007. [9] S. Harnad. The symbol grounding problem. Physica D, 42:335 346, 1990. [10] B. MacLennan. Synthetic ethology: An approach to the study of communication. Technical Report CS-90-104, Computer Science Department University of Tennessee, Knoxville, 1990. [11] B. MacLennan. Synthetic ethology: A new tool for investigating animal cognition (extended version). Technical Report UT-CS-01-462, Computer Science Department University of Tennessee, Knoxville, 2001. [12] B. MacLennan. Making meaning in computers: Synthetic ethology revisited. In Loula, Gudwin, and Queiroz, editors, Artificial Cognition Systems, pages 252 283. Idea Group Publishing, Hershey, 2007. [13] J. R. Searle. Minds, brains and programs. Behavioral and Brain Sciences, 1:417 424, 1980. [14] L. Steels. The symbol grounding problem has been solved. so what s next? In M. de Vega, editor, Symbols and Embodiment: Debates on Meaning and Cognition, chapter 12. Oxford University Press, Oxford, 2008. [15] L. Steels and P. Vogt. Grounding adaptive language games in robotic agents. In C. Husbands and I. Harvey, editors, Proceedings of the 4th European Conference on Artificial Life. The MIT Press, 1997. [16] M. Taddeo and L. Floridi. Solving the symbol grounding problem: A critical review of fifteen years of research. Journal of Experimental and Theoretical Artificial Intelligence, 17(4):419 445, 2005. [17] A. M. Turing. Computing machinery and intelligence. In A. R. Anderson, editor, Minds and Machines, pages 4 30. Prentice Hall, 1964. [18] P. Vogt. Language evolution and robotics: issues on symbol grounding and language acquisition. In Loula, Gudwin, and Queiroz, editors, Artificial Cognition Systems, pages 176 209. Idea Group Publishing, Hershey, 2007. [19] W. Wallach and C. Allen. Moral Machines: Teaching Robots Right from Wrong. Oxford University Press, New York, 2009. [20] T. Winograd and F. Flores.., 1986. Understanding Computers and Cognition, 1986. [21],, and.., 2002. [22].. In 6, pages 127 155., 2005. [23] and. WAMOEBA-2. C, 65(633):166 172, 1999. 11