From 742ef64ea39f1d17e0402b64d4283cbade69e1cf Mon Sep 17 00:00:00 2001
From: Jet Hughes <jethughes0@gmail.com>
Date: Thu, 16 Mar 2023 08:57:27 +1300
Subject: [PATCH] vault backup: 2023-03-16 08:57:27

---
 ...lenges-for-ubicomp-and-intro-to-sensors.md | 62 +++++++++++++++++++
 content/notes/info-305.md                     |  1 +
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 create mode 100644 content/notes/06-challenges-for-ubicomp-and-intro-to-sensors.md

diff --git a/content/notes/06-challenges-for-ubicomp-and-intro-to-sensors.md b/content/notes/06-challenges-for-ubicomp-and-intro-to-sensors.md
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+---
+title: "06-challenges-for-ubicomp-and-intro-to-sensors"
+tags: 
+- lecture
+- info305
+---
+
+Challenges
+- What’s difficult about Ubiquitous Computing? 
+	- Requires understanding of sensors and new sensing technologies 
+		- Noisy inputs 
+		- Sensor fusion 
+- Wireless communication channels 
+- Power consumption 
+- Context is only a proxy for human intent 
+	- Unpredictable ussage context in particular for mobile devices 
+- Require novel user interfaces, limited/different I/O capabilities 
+	- Lack of standardization in interface patterns 
+- Privacy & Security
+
+Wireless Communication Channels
+- ![https://www.ntia.doc.gov/files/ntia/publications/january_2016_spectrum_wall_chart.pdf](https://i.imgur.com/54UbAHD.png)
+- Unpredictable availability and throughout 
+- Many physical issues: 
+- Refraction 
+- Absorption 
+- Antenna Geometry 
+- Power Limits 
+- Wireless spectrum is highly contested 
+- Many sources of interference 
+- Limited bandwith available 
+- Often complext SW/HW stacks
+
+Power Consumption
+- Biggest energy consumers 
+	- Display (backlight) 
+	- Wireless modules 
+	- GPS receiver, cameras 
+	- Sensors (touch, accelerometer, IMU) 
+- Limited power supply 
+	- Tradeoff: capacity vs. size/weight/portability 
+	- Energy consumption becomes important 
+- Two solutions: 
+	- Increase energy in relation to size/weight 
+		- Requires chemistry & physics knowledge 
+	- Decrease energy consumption 
+		- Requires CS/IS/EE knowledge
+- ![graph](https://i.imgur.com/VDhdsF2.png)
+
+Privacy and Security
+- Context awareness requires huge amounts of private & personal data (see current generation mobile devices) 
+	- Emails, contacts 
+	- Sensor data, movement profiles 
+	- PIN/TAN codes 
+	- Photos 
+- Many people want to access data 
+	- Google, Facebook, Microsoft (> ads) 
+	- NSA, GCHQ, BND, Five Eyes (> crime prevention) 
+	- Hackers (> extorsion, stealing your money) 
+- Problem 1: No pervasive encryption 
+- Problem 2: Voluntary use of cloud services, interconnected services
+
diff --git a/content/notes/info-305.md b/content/notes/info-305.md
index 22b6e6dd8..8ef1b04c6 100644
--- a/content/notes/info-305.md
+++ b/content/notes/info-305.md
@@ -19,5 +19,6 @@ tags:
 - [[03-intro-AR-dev]]
 - [[04-lens-studio]]
 - [x] [[05-pervasive-ubiquitious-2]]
+- [[06-challenges-for-ubicomp-and-intro-to-sensors]]
 
 # Info
\ No newline at end of file