MANAGEMENT INFORMATION SYSTEMS LOOSELEAF
16th Edition
ISBN: 9780135205518
Author: LAUDON
Publisher: PEARSON
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Expert Solution & Answer
Chapter 7, Problem 4RQ
Explanation of Solution
Bluetooth
- Bluetooth devices are used to transmit low power wireless data with devices in small range distance at the range of 10cm (Centimeter) to 30m (Meter).
- Bluetooth devices contain higher transfer rate at the range of 722 kbps (Kilobits per second).
- It is low-cost and easy to install, simple and convenient to use, and many applications can be transmitted using the device.
- The Bluetooth is used to transmit between music players such as mobile phones to headsets.
- It will connect one computer with another computer.
Wireless-Fidelity (Wi-Fi):
- It has third generation wireless access connection. In this, the data is transmitted to or from the node points within the radius range.
- The radius of the network ranges up to meters. The node point is connected to a wired network and shares the data with wireless users.
- It is connected through Local Area Network (LANs), and Wide Area Network (WANs).
WiMAX:
WiMAX stands for Worldwide Interoperability for Microwave Access.
- WiMAX is the forthcoming new technology standard for long distance wireless communications.
- The WiMAX technology is designed to join the Wi-Fi and DSL (Digital Subscriber Line).
- Short range wireless communication is covered by Wi-Fi technology.
- Long range wired communication is covered by DSL technology...
Explanation of Solution
Capabilities and suitable applications of each types of technologies:
Bluetooth
- It provides only limited access and is used to create small personal-area network.
Wi-Fi
- It covers from 30 meters to 50 meters and is used to create small local-area network...
Explanation of Solution
Radio Frequency Identification (RFID):
- RFID is a mobile wireless technology that is used to facilitate supply chain management.
- Movement of data is tracked by RFID. It captures and provide instant goods movement information between the supply chain partners.
Working of RFID:
- RFID system provides a microchip that contains the details of an item and its location...
Explanation of Solution
Wireless Sensor Data (WSN):
It is a network of organized wireless devices. A network consists of thousands of nodes.
It helps to observe the building security or to detect harmful substances in the air.
Working of WSN:
- The WSN is a network of interrelated wireless devices with some processing and radio-transmitting capacity that are embedded into the physical environment to give measurements of various points over huge spaces...
Expert Solution & Answer
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Given a shared data set, we allow multiple readers to read at the same time, and only one single writer can access the shared data at the same time. In the lecture slides, a solution is given. However, the problem is that the write cannot write forever, if there are always at least one reader.
How to ensure that the writer can eventually write? Propose your solution by using semaphores and implemented in Python
from threading import Thread, Semaphore
from time import sleep
from sys import stdout
class Reader(Thread):
def__init__(self, name):
self.n=name; Thread.__init__(self)
defrun(self):
globalnr, nw, dr, dw
whileTrue:
# ⟨await nw == 0 then nr += 1⟩
e.acquire()
ifnw>0:
#if nw > 0 or dw > 0 :
dr+=1; e.release(); r.acquire()
nr+=1
ifdr>0: dr-=1; r.release()
else: e.release()
# read data
stdout.write(self.n+' reading\n')
sleep(1)
# ⟨nr -= 1⟩
e.acquire()
nr-=1
ifnr==0anddw>0:
dw-=1 ; w.release()
else: e.release()
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Chapter 7 Solutions
MANAGEMENT INFORMATION SYSTEMS LOOSELEAF
Ch. 7.3 - Prob. 1.1CQCh. 7.3 - Prob. 1.2CQCh. 7.3 - Prob. 1.3CQCh. 7.3 - Prob. 1.4CQCh. 7.3 - Prob. 2.1CQCh. 7.3 - Prob. 2.2CQCh. 7.3 - Prob. 2.3CQCh. 7 - Prob. 1IQCh. 7 - Prob. 2IQCh. 7 - Prob. 3IQ
Ch. 7 - Prob. 4IQCh. 7 - Prob. 5IQCh. 7 - Prob. 6IQCh. 7 - Prob. 1RQCh. 7 - Prob. 2RQCh. 7 - Prob. 3RQCh. 7 - Prob. 4RQCh. 7 - Prob. 5DQCh. 7 - Prob. 6DQCh. 7 - Prob. 7DQCh. 7 - Prob. 8HMPCh. 7 - Prob. 9HMPCh. 7 - Prob. 10HMPCh. 7 - Prob. 11HMPCh. 7 - Prob. 13CSQCh. 7 - Prob. 14CSQCh. 7 - Prob. 15CSQCh. 7 - Prob. 16CSQCh. 7 - Prob. 17MLMCh. 7 - Prob. 18MLM
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