Sorting of data elements is a technical problem arising in many fields including statistics. Sorting is the process of rearranging disordered data elements according to the values.

The most important problem in sorting is to decrease the complexity of sorting. Previous papers described several methods to improve selective sorting, one of which is to select and store small data elements during a single scan to shorten the sorting time using a queue.

In order to further update the time of selective sorting, Jong Yong Bok, a researcher at the Faculty of Information Science and technology, has proposed a method of shortening the run time for sorting by half over the existing methods by selecting and storing both the minimum and maximum elements at the same time during one pass using a queue and a stack.

The proposed method proves to be effective for sorting data elements in the fields where they appear iteratively with fortuity including statistics of population according to age and grade management.

Brittle material cutting by laser, which is performed below the glass transition temperature, exerts no external force on blanks and leaves no need for grinding as it ensures smooth edges and clean cutting.

The controlled cutting technique generates tensile stress along the cutting path and maintains the temperature below the glass transition temperature. With this technique, it is difficult to control fissure propagation inside the glass because of its cutting characteristics and stress distribution. What is important for it is to generate precise temperature and thermal stress fields and to decrease the cut deviation at the leading and trailing edges of glass.

Kim Yong Il, a researcher at the Institute of Nano Science and Technology, has built a finite element model for temperature and stress fields of glass, established boundary conditions, and studied the effect of laser cutting speed on minimizing the cutting path deviations at the leading and trailing edges while decreasing the thermal stresses.

Through the simulation, he has proved that the cutting deviations at the trailing and leading edges seem to be decreased remarkably at the optimized power and cutting speed during continuous laser cutting. In addition, he has predicted that continuous laser is not suitable for soda-lime glass of 5mm in thickness above 900W of mean power and 22.5mm/s of scanning speed.

It is very important to correct the synchronization errors that occur if the receiver is not completely synchronized with the transmitter. However, it is impossible to achieve perfect synchronization in many communication systems.

Synchronization errors due to the insertion and deletion of symbols can cause serious performance degradation if the coding scheme does not possess the capability to recover from such errors.

Pak Jang Son, a researcher at the Faculty of Communications, has proposed a method for correcting synchronization errors that occur in Turbo code sequence using the algebraic operation principle of Scarce-State-Transition (SST) Viterbi decoder.

The encoding/decoding procedures of Turbo code in this method are similar to the common case, except making corrupted bit positions caused by bit insertion/deletion in received Turbo code sequence take their original positions.

The simulation result shows that the proposed method is capable of correcting synchronization errors occurring in the received Turbo code sequences.