Currently, the commercialization of the 5th Generation (5G) service is becoming more prevalent in domestic communication network technology. This has reduced communication delay time and enabled large-capacity data transmission and video streaming services in real-time. In order to keep pace with these developments, K-water has introduced a smart process control system in water purification plants to monitor the status of the water purification process. However, since wireless networks are based on the public Long Term Evolution (LTE) network, communication delay time remains high, and high-resolution video services are limited. This is because communication networks still have a closed structure due to expense and security issues. Therefore, with 5G in its current form, it is very difficult to accommodate future services without improving the infrastructure of its communication networks. In recognition of these problems, this study implemented the authentication and management function of wireless networks on a wired network management system in the K-water Bansong water purification plant. The results confirmed that wired Local Area Network (LAN) services give a higher security performance than an expensive commercial wireless LAN system. This was achieved by using an Internet Protocol (IP) address management system of wired networks and the packet filtering function of the Layer2 (L2) switch. This study also confirmed that it is possible to create a wireless LAN service that is 3.7 times faster than the existing LTE communication network.

본 논문에서는 해상에서 사용 가능한 이중대역 무선랜 안테나를 설계하였다. 탄젠트 손실이 없는 FR-4기판을 사용하였으며, 유전율은 4.4, 32mm*28mm*1.6mm의 크기를 갖는다. 입력대비반사손실이 2.4GHz와 5.8GHz대역에서 -10dB이하로 동작하며 간단한 구성으로 50옴 마 이크로스트립라인에 의해 급전하는 안테나를 설계하여 양호한 반사손실을 보임을 확인하였다.

본 논문에서는 선박 내 무선통신을 위한 무선랜용 미엔더 라인 안테나를 개발할 것이며, IEEE 802.11a에서 제정한 WLAN 대역인 2.4 ∼ 2.46 GHz와 5.15 ∼ 5.35 GHz 대역을 만족할 수 있는 안테나를 설계한다. 안테나는 32⨉16㎟의 기판에 설계되었으며, 설계한 안테나의 특징은 무선랜 공진주파수 대역에서의 정합을 만족한다. 직사각형 패치의 길이를 조정함으로써 두 개의 공진 주파수를 얻을 수 있었으며, 얻어 진 임피던스 대역은 2.4GHz에서 12%, 5GHZ에서 45.3%의 특성을 보였다. 또한 공진주파수 대역에서 비교적 양호한 방사패턴과 안테나 이득을 얻을 수 있었다.

Wireless LAN systems have been widely implemented for supporting the sireless internet services especially in the hotspot areas such as hospitals, homes, conference rooms, and so on. Compared with wired LAN systems, wireless LAN systems have the advantage

In recent years, advancement of science technology and ubiquitous use of networking have led to a great increase of the need for high speed wireless internet. This has encouraged the existing Wireless Local Area Network(WLAN) system to build a new territory in the information and communication market. It provides with reasonable price and convenience, however, its connectivity, transmission speed and mobility do not meed consumers' expectations. In this paper, the standards for grading quality according to the purposes of the WLAN service, applying the concept of composition cause of the service quality that has already been agreed upon, will be reconstructed. Also, this study will try to measure the achievements of the actual WLAN service quality by utilizing the realized measurement standards.