-- The study on comparative analyzing the astronomical data gained by variety kinds of technologies and means has been performed in many nations. The applicable fields in astronomy to the network infrastructure are Virtual Observatory, Very Large Baseline Interferometer network (VLBI), and Global Network System (GNSS). At present, the expansion of network infrastructures in the astronomy fields is highly recommended when considering time-consuming wise. With the well-organized network system, the time required in the ongoing astronomical studies can be reduced by two years.

-- As the dispute about climatic disasters and the plans to deal with them become more active, the need for network system in atmospheric science is growing. In the long past, atmospheric science was sorted into either atmosphere, weather, or climate. However, Global Earth Observation System of System (GEOSS) represents the more comprehensive concept of atmospheric science these days. The study of atmospheric science also suffer from the limitation of development because the related networks are insufficient and the devices in each nation are dissimilar to another.

ince the scope of the ITER project is to verify whether the commodity fusion energy is practical in technology and engineering aspects, both the domestic and international superhigh speed research network infrastructures are absolutely prerequisite.

-- With the K*Grid, the Information Technology (IT) can be combined with the emerging technologies such as bio-engineering and nano-technology, as well as traditional engineering fields. In particular, the design of new medicines, practical engineering problems in industry, and the development of a Korean space launcher can be conducted within the framework of the K*Grid. Especially, the electronic and atomic structure of materials for potential technological applications for nano-devices can be also investigated as an examples of high-throughput computing applications in the field of nano-technology. Furthermore, scientists and engineers can easily access to the application Grid through the Grid browser. It can set up problems, then allocate the computing resources and finally retrieve results on the browser.

-- High Energy Physics is the study of a reciprocal action in the elementary particles. The network infrastructures are mainly in need to organize and transmit a vast amount of data which generated form high energy researches. The adequate infrastructure systems must be capable of collecting and analyzing data and, serving the users who locate in dispersed areas to access to the data through the only Superconducting Super Collider.

-- The medical teams in the USA, Russia, Japan, etc. are conducting complex and delicate co-researches by sharing clinical experiences, medical instruments, and medical data through International Medical Information System.? Neurosurgery has amplification of internet and grid resources, and virtual designs or tele-consultations as its objects.? However, the limitation of the transmission volume and network speed does not permit the researchers to make favorable progress.

-- We support many practical research which we refered to the page before through Network Engineering. Network bandwidth in use is tend to depend on practical technology. Looking around tendency of several research teams, it can be approached two parts, not only effort in electrical transmission technology through high bandwidth but also efficient data transmission through low bandwidth.

-- High-definition digital video contents, known as HDTV, are widely used through the research network. The generally mentioned HDTV includes image sources zipped by Mpeg-2 and require the bandwidth of 19.2Mbps, and about 20packeted sources are actually sent through the network system. Domestic network is equipped with 2.5Gbps of backbone; however, the bit rate or frame of research sources are often reduced to less than 1G because only 1G of backbone is linked to the network. To practice limitation free researches, the network infrastructures acutely need to be introduced.