講演者: 馬場雪乃先生（京都大学）

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-tap to take a photo.
-tap to begin recording
your question and again to stop. side,
User ?
Web Server -
Database -
Local Client
Remote Services and Worker Interface
J. Bigham et al.: VizWiz: Nearly real-time answers to visual questions, In UIST, 2010.

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8. Quizz: Targeted Crowdsourcing with a
Billion (Potential) Users (WWW’14)
Panagiotis G. Ipeirotis (Goodle, NYU)
Evgeniy Gabrilovich (Google)

9. 9/19
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Figure 3: Example ad to attract users
time a user clicks on the a
we record a conversion ev
the advertising system. T
the system to optimize th
mizing the number of con
contribution yield, instead
the number of clicks.
Although optimizing fo
Figure 1: Screenshot of the Quizz system.
healthline

10. 10/19
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𝑢 𝑞
(𝐻 1/𝑛, 𝑛 = log ( 𝑛), 𝐻 1, 𝑛 = 0
IG(✓u, nq) = H(1/nq, nq) H(✓u, nq)

11. 11/19
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Pr [qu] ⇠ Beta (au + 1, bu + 1)

12. The Wisdom of Minority: Discovering and
Targeting the Right Group of Workers for
Crowdsourcing (WWW’14)
Hongwei Li (UC Berkeley)
Bo Zhao (Microsoft Research)
Ariel Fuxman (Microsoft Research)

13. 13/19
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● 𝑢
● 𝜃1
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● 𝒘
xu = (xu1, xu2, . . . , xun)
⌧u = IG(✓u, n)
⌧u ⇠ N w>
x,

15. FaitCrowd: Fine Grained Truth Discovery
for Crowdsourced Data Aggregation
(KDD’15)
Fenglong Ma (SUNY Buffalo) et al.

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17. 17/19
● 𝑞 𝑤45
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𝑧4
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o 𝑦45
o 𝑦45 = 1 𝑧4
𝜙9:
,
𝑦45 = 0 𝜙′
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h

18. Pr [yuq = tq] =
1
1 + exp ruzq
✓uzq
⌫q
18/19
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- 𝜃1<
- 𝑧4
- 𝜈4
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