The Implementation of Electronic Network Systems in Japanese Firms

2002 ◽  
pp. 238-248
Author(s):  
Toshio Mitsufuji
Keyword(s):  
Information Technology ◽  
Local Area Network ◽  
Research Work ◽  
Implementation Process ◽  
Local Area ◽  
Multimedia Systems ◽  
Area Network ◽  
Large Firms ◽  
Network Systems ◽  
Electronic Network

This study aims at investigating the implementation process of electronic network systems in Japanese large firms, focusing on the innovativeness among industries to which firms belong. The electronic network systems such as Local Area Network (LAN) have spread rapidly during last several years. Accordingly, many firms in Japan have introduced them in their organizations. After the advent of the computer invention, computer and telecommunications technologies have merged into information technology, making a remarkable progress constantly for several decades. The electronic network systems are a kind of information technology, going back to 1950s when data communications systems were first developed. In the beginning were these systems managed by professional people. However, due to the rapid progress of the information technology, even untrained people who have no specific knowledge about IT or do not belong to the IT section have been able to use the electronic network systems in business organizations since the late 1980s. In addition, especially with the appearance of multimedia systems and the expansion of the usage of Internet, many organizations have begun introducing electronic network systems since 1990s. For this study, we sent questionnaires in 1996 to Japanese large firms in which they employed more than 1000 people. Based on the results and the interviews made in connection with this research work, we analyze first the state of the introduction of the electronic network systems, focusing on the innovativeness of firms. Next, we examine why the electronic network systems have come into wide use among Japanese large firms.

Multiple Source-Load-Storage Cooperative Optimization of Energy Management for Energy Local Area Network Systems

2020 ◽  
pp. 355-380
Author(s):  
Tao Zhang ◽  
Fuxing Zhang ◽  
Hongtao Lei ◽  
Rui Wang ◽  
Kaiwen Li ◽  
...  
Keyword(s):  
Energy Management ◽  
Local Area Network ◽  
Local Area ◽  
Multiple Source ◽  
Area Network ◽  
Network Systems

Local area network systems

2003 ◽  
pp. 142-175
Author(s):  
David Bailey ◽  
Edwin Wright
Keyword(s):  
Local Area Network ◽  
Local Area ◽  
Area Network ◽  
Network Systems

A Wireless Local Area Network Channel Estimation Scheme

2013 ◽  
Vol 443 ◽  
pp. 462-467
Author(s):  
Xiang Bin Gao
Keyword(s):  
Channel Estimation ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Area Network ◽  
Ofdm Systems ◽  
Network Systems ◽  
Ieee 802.11A ◽  
Estimation Scheme ◽  
Network Channel

In this paper, a robust channel estimation scheme is proposed for the OFDM based wireless local area network systems. The proposed channel estimation scheme has been done targeting the IEEE 802.11a standard [, but it can be extended to other packet-based OFDM systems. A robust channel estimation scheme is proposed for the OFDM-based wireless local area network systems. Performance evaluation shows that the WLAN system with the proposed channel estimation scheme is with practical system performance under harsh fading channel.

scholarly journals Received Signal Strength Indication (RSSI) of 2.4 GHz and 5 GHz Wireless Local Area Network Systems Projected over Land and Sea for Near-Shore Maritime Robot Operations

2019 ◽  
Vol 7 (9) ◽  
pp. 290 ◽  
Author(s):  
Brennan Yamamoto ◽  
Allison Wong ◽  
Peter Joseph Agcanas ◽  
Kai Jones ◽  
Dominic Gaspar ◽  
...  
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Path Loss ◽  
Local Area ◽  
Area Network ◽  
Network Systems ◽  
Rf Propagation ◽  
Near Shore ◽  
5 Ghz ◽  
Maritime Environment

The effect of the maritime environment on radio frequency (RF) propagation is not well understood. In this work, we study the propagation of ad hoc 2.4 GHz and 5 GHz wireless local area network systems typically used for near-shore operation of unmanned surface vehicles. In previous work, maritime RF propagation performance is evaluated by collecting RSSI data over water and comparing it against existing propagation models. However, the multivariate effect of the maritime environment on RF propagation means that these single-domain studies cannot distinguish between factors unique to the maritime environment and factors that exist in typical terrestrial RF systems. In this work, we isolate the effect of the maritime environment by collecting RSSI data over land and over seawater at two different frequencies and two different ground station antenna heights with the same physical system in essentially the same location. Results show that our 2.4 GHz, 2 m antenna height system received a 2 to 3 dBm path loss when transitioning from over-land to over-seawater (equivalent to a 25 to 40% reduction in range); but increasing the frequency and antenna height to 5 GHz, 5 m respectively resulted in no meaningful path loss under the same conditions; this reduction in path loss by varying frequency and antenna height has not been demonstrated in previous work. In addition, we studied the change in ground reflectivity coefficient, R , when transitioning from over-land to over-seawater. Results show that R remained relatively constant, −0.49 ≤ R ≤ −0.45, for all of the over-land experiments; however, R demonstrated a frequency dependence during the over-seawater experiments, ranging from −0.39 ≤ R ≤ −0.33 at 2.4 GHz, and −0.51 ≤ R ≤ −0.50 at 5 GHz.

Multi-Band Rectangular Zig-Zag-Shaped Microstrip Patch Antenna for Wireless Applications

2020 ◽  
pp. 66-86
Author(s):  
Pranay Yadav ◽  
Bharat Bhushan Khare ◽  
Sudesh Gupta ◽  
Yash Kumar Kshirsagar ◽  
Swati Jain
Keyword(s):  
Patch Antenna ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Research Work ◽  
Local Area ◽  
Area Network ◽  
Fifth Generation ◽  
Communication Devices ◽  
Cut Set ◽  
Multi Band

In the era of fifth generation communication system, multi-band patch antenna is the key element of this system. Most of the wireless communication devices work in the range of 1 to 6 GHz such as wireless fidelity (Wi-Fi), Wi-Max, and wireless local area network. In this research work, a modified zig-zag-shaped multiband patch antenna with cross-cut set that covers 1 to 6 GHz range is designed. Proposed patch antenna shows five different bands at different resonant frequencies 1.4, 2.3, 2.5, 3.42, and 4.16 all in GHz. The proposed zig-zag-shaped patch antenna also calculates the radiation pattern and specific absorption rate (SAR).

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