PTN (Packet Transport Network) based on MPLS-TP (Multi-Protocol Label Switching-Transport Profile) does not rely on subscriber service signals. It provides real-time transmission and robust OAM (Operation, Administration and Maintenance) functions thanks to VPN (Virtual Private Network) technique using LSP (Label Switch Path) and PW (Pseudo-Wire) for transparent transport, thus being widely used in transport systems for mobile communication.

The PTN for 3rd generation mobile communication is operated in the centralized way, and it is difficult to apply to the next generation mobile communication.

Kim Myong Jun, a researcher at the Faculty of Communication, has proposed a method of how to apply MPLS-TP based PTN device using dedicated network processor WINPATH to the next generation systems, and verified its application possibility.

The experimental results show that transport network for next generation can adopt MPLS-TP based PTN device by the proposed method.

Radiation leaking into the surrounding environment has a detrimental effect on the human body, so it should be evaluated first to prevent it.

The most considerable radiation affecting the human body is gamma rays. This is because the penetrability of gamma rays is the strongest of all other kinds of radiation. Therefore, gamma dose measurement is of paramount importance for its dosimetry.

Radiation detectors for environmental radiation monitoring usually include scintillation detectors, ionization chambers, and automatic discharge counters. Among them, automatic discharge counter tubes are widely used for environmental radiation monitor fabrication because of their low cost and simple measurement circuitry. However, the automatic discharge counter tubes manufactured at home and abroad have the disadvantage of narrow energy band for dose estimation and low counting rate.

Pak Yong, a researcher at the Institute of Analysis, has designed a new environmental radiation monitor to measure radioactive contamination and environmental radiation.

By applying the time-count conversion method, he eliminated the effect of dead time in the GM counter tube and extended the counting rate measurement range from 2×10³ to 10⁵cells/s.

The proposed monitor enables measurement from 10nSv/h to 200mSv/h using two GM counters with improved properties.

The earth’s crust is in ceaseless movement by the physical and chemical process of lava underneath itself and the gravitation force between the earth and other celestial bodies including the sun and the moon. Monitoring the tilt change of the earth’s crust is critical to detect the signs of crustal deformation.

A tiltmeter is an instrument for monitoring the ultra-fine tilt change of the crust (about 150nrad/day). Nowadays, geophysical scientists and researchers predict the precursory activity of natural disasters including earthquakes and volcanoes by analyzing the monitored data of tilt change. The earth tide tiltmeter is so accurate and sophisticated that it is usually expensive.

Ri Hyok Min, a researcher at the Institute of Nano Science and Technology, developed a low-cost tiltmeter based on a capacitive micro-displacement sensor and conducted a calibration and field test.

The micro-displacement sensor is a differential capacitive one, which consists of two fixed plates and a movable plate. The movable plate is the bob of the vertical pendulum which reflects the tilt of the earth’s crust. The sensor signal is pre-amplified by the Low-Z type amplifier and then processed by the lock-in amplifier.

He calibrated the tiltmeter by using the heavy block method. He verified the measured data of the developed tiltmeter by using MATLAB. The prototype of the developed tiltmeter had been installed in the dedicated laboratory to be operated for 4 months.

The results show that the developed tiltmeter is simple and cheap for monitoring the tilt of the earth’s crust and it is useful for predicting the precursor of earthquakes and volcanoes.