Transcript Introduction of Electronic Commerce

ORF 401 - Electronic Commerce
Spring 2015
Introduction of Electronic Commerce
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Class List: enrolled students
Background NasdaqBubble, Now
Course Overview: http://orfe.princeton.edu/courses/orf401/
Requirements
– 4 programming assignments (Labs)
– final projects:
• nCommerce (Navigation-based Commerce)
• Real-time Management& Control of Mobile Assets Campus Shuttles
• Leveraging Google Maps; OpenStreetMap; Google Maps announces a 400 year advantage over
Apple Maps.
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Android and the Other SmartPhones: Samung; HTC ; LG ; Sony; Nokia
wrist computers and glasses and Virtual Reality HoloLens .
Beyond SETI and user certified content Wiki; Waze
Spatial Dot Maps http://www.coopercenter.org/demographics/Racial-Dot-Map
– Who’s involved
– TA: Chenyi Chen Teaching Assistant Office Hours are Friday 3:30-5:30pm or by
appointment in Transportation Atelier ( Basement ORFE)
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ORF 401 - Electronic Commerce
Spring 2015
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Interesting Sites
Parrot's AR.Drone. The Flying Video Game,
Map of the Market
iOnRoad
Robot Quadrotors Perform James Bond Theme – YouTube
A Swarm of Nano Quadrotors - YouTube,
J-Track 3D Satellite Tracking/“
Drive-Time New Jersey: Your Daily Commute
Campus Shuttles
Smart Driving Cars
Hyundai
HoloLens
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ORF 401 - Electronic Commerce
Spring 2015
The Internet’s Fundamental Empowerment
• It enables:
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a needle in a haystack
to find another needle in that or another haystack
somewhat efficiently, and
enable a relationship among the needles
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ORF 401 - Electronic Commerce
Spring 2015
What is eCommerce ? eBusiness?
• eCommerce: use of the internet to transact business;
digitally enabled transactions among organizations
and individuals
• eBusiness: refers primarily to the digital enablement
of transactions and processes within a firm.
(accounting and on-line inventory, optimal
management and control of mobile assets.)
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ORF 401 - Electronic Commerce
Spring 2015
Elements of eCommerce & eBusiness
• eCommerce
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Selling, Buying
Customer support
nTertainment
Navigation-based Services; nCommerce
User generated content generation and distribution (crowd sourcing)
• eBusiness
– Back-office support (really eBusiness)
• document/funds transfer, documentation, regulatory compliance
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Content generation (crowd sourcing)
Distribution
Design & manufacture
Optimal Management and Control of Mobile Assets
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ORF 401 - Electronic Commerce
Spring 2015
Unique features of eCommerce Technology
• Ubiquity: available “everywhere”
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Radio is VERY important: Tech, telecom giants take sides as FCC proposes large public WiFi networks
Global reach: knows no boundaries (almost)
Universal standards: W3C
Richness: video(+), audio(?), tactile(-), olfaction(0),taste(<0)
Interactivity: user part off the loop
Information density: scope, timeliness
Personalization/Customization: targeted content
Social Technology: Open to user content contribution
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ORF 401 - Electronic Commerce
Spring 2013
Internet Hierarchy
• (Inter)Network Topology Reference (Alderson, CalTech)
• Phone - Circuit switched
– Have a continuous connection
• Internet - Packet switched over a physical network
• ARPANet (1969) > NSFNet (1985) > WWW (1993)
• Protocols govern how applications access the
network
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ORF 401 - Electronic Commerce
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International Standards
Organization
W3C site has links to all the details and the “latest&greatest”
W3C’s Mission
• created a 7 layer model defining the basic functions:
– OSI Reference model
• Open System: different network systems supporting the functions of a related layer can exchange
data
• Peer-to-Peer: Data created by one layer and transmitted to another device pertains only to that layer.
Intervening layers do not alter data; they simply add data in order to perform their functions on the network.
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ORF 401 - Electronic Commerce
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Layer
OSI Reference Model
Function
Info transferred
TCP/IP
1. Application
Data to send?
Application Message
ftp, http, snmp, dns
2. Presentation
Data look like?
Encrypted/compressed data
3. Session
Who is the partner?
Session manager
4. Transport
Where is partner?
Multiple packets
TCP, UDP
5. Network
Route to follow?
Packets
IP, ARP
6. Data Link
Each step in route?
Frames
Ethernet, ppp
7. Physical
Use each step?
Bits
Physical wiring
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ORF 401 - Electronic Commerce
Spring 2015
Physical Layer (network) hierarchy
Backbone
high speed: ATT, MCI/WC
Network Access Points (NAP)
Sprint, Pac Bell,
Regional networks
CERFnet, Uunet, PSInet
Internet Service Providers (ISP)
AOL, ATT, Bell Atl. Mobile (BAM)
User Organizations
Tigernet
User
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ORF 401 - Electronic Commerce
Spring 2015
Network layer operations: several concepts
• Dadagrams:
packets move freely
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• Virtual Circuits: force circuit-like
behavior
• Routing Method:
Varies w/level in
Hierarchy
• Packet contents:
Address (from, to),
version, length, time-to-live, etc., data
• Example: Internet Protocol (IP)
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ORF 401 - Electronic Commerce
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What makes IP, IP?
• Fixed length addresses
192.21.33.17
– must be unique since routing isn’t
– Domain name system (DNS) coverts quad to name
– standard port numbering: :80 (http) , :25 (mail)
• Allows intermediate networks to fragment
datagrams
• It does NOT guarantee delivery
• It does NOT ensure integrity of the payload
• It does NOT guarantee order of receipt
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Transport Layer (host-to-host)
• Issues
– how & when to provide reliable comm. over unreliable channels
– performance
– fragmentation & re-assembly
• Service Models:
– connectionless >>> circuit-like
– issues error detection, timing, error recovery
– examples:
• TCP: reliable, bi-directional, byte string (returns what was received);
• UDP: uses only “check sum” to determine if it got it all. (no
confirmed receipt)
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