Jo Oct 7, 2022
In Koguryo, a nationwide atmosphere of giving priority to martial arts was established and national military arts like riding, archery, etc. were encouraged. Koguryo people trained their strong spiritual and physical strength and will by doing martial arts.
The neighbouring countries were foreign forces of aggression that were constantly threatening the sovereignty of Koguryo. They showed their undisguised aggressive attempts and made constant invades. To make matters worse, the countries of the same blood, Paekje and Silla, too, were hindering Koguryo’s policy of unifying the three kingdoms in every possible way by invading the territory of Koguryo.
From such pressing requirements, Koguryo created the atmosphere of doing martial arts and took measures to encourage it so that all the people would possess patriotism and spirit of defending their native places, and regard defending their country from foreign invasions as their obligation and glory.
First, Koguryo made it a social climate to do martial arts throughout the country. The people considered displaying courage in battlefields as their obligation.
Next, necessary measures were taken to encourage it. Having fully recognized the might and importance of martial arts on horses with great capabilities of mobility, attack and strike in the wars in the middle ages, Koguryo laid stress on increasing the number of cavalrymen when organizing the army and intensified horse-riding martial arts training such as archery, fencing, spearing and doing acrobatics and galloping, etc. Infantry forces were also strengthened and martial arts training with and without equipment were actively conducted among them. In addition, national competitions on martial arts were frequently held and the system of offering government services to qualified warriors on the basis of those competitions was established. On March 3 every year, hunting contests were held on Rangnang Hill. Here, people were tested on their martial arts practised for a year, and winners were awarded commendations. The story of Ondal, a man of low birth, who was appointed to a government post by displaying in a hunting contest his high skills in martial arts gained through his constant practice, is recorded in Samguksagi (Chronicles of the Three Kingdoms).
Ordinary people also made doing martial arts a part of their everyday life and a system of teaching martial arts was established for this. Not only martial arts matches but also other national sports games and amusements held on several occasions including holidays were all focused on practicing martial arts and building up physical strength.
In order to bring up coming generations to be able ones equipped with ample knowledge and strong physical strength, they prepared a place called kyongdang for teaching ordinary people martial arts. Here, young people trained their martial arts and bodily force, and matches for testing their skills were frequently arranged in various forms and ways.
On the basis of the historical environments and conditions and the atmosphere of doing martial arts, Koguryo enriched the contents and methods of the national martial arts of the Middle Ages in keeping with the developing reality.
The climate of doing martial arts in Koguryo provided the people with high national pride and confidence, strong physical strength and courage, and it gave positive influences on vigorously pushing ahead with the cause of unifying the three kingdoms and exalting the honour and dignity of Koguryo, a thousand-year power, by successfully repulsing constant large-scale aggressions of foreign forces.
Im Sung Bin, section head at the Academy of Social Sciences
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Jo Oct 6, 2022
“Digital Signal Processing” is a subject which studies mathematical methods for the digital processing of signals. It covers several mathematical methods for digital signal processing such as analog signal conversion, Fourier transform of signal, design of an infinite impulse response (IIR) digital filter, and design of a finite impulse response (FIR) digital filter.
In order to acquire application abilities of understanding the mathematical principles covered in the subject and of applying them to practice, students must develop the ability to convert various analog signals into digital ones and to send them to computers to analyze various kinds of information.
In order to solve this problem, Jong Kyong Su, a researcher at the Faculty of Communications, has employed LabVIEW in his teaching to enhance the abilities of cognition and creation.
First, he made his students active in acquiring mathematical knowledge in signal processing by planning his lectures so that students could develop a comprehensive DSP that covers all the contents of the lecture.
Second, he planned his lectures so that students could put their mathematical knowledge touched in lectures into use by using LabWIEW, thus raising their application ability.
Third, he led students to writing a comprehensive program that runs through the whole course from the subprograms prepared in each lecture, thus increasing the ability of students to apply their mathematical knowledge for digital signal processing.
In the lectures, he made students develop a comprehensive program using LabVIEW that enables digitization, communication, Fourier transform, digital filtering, and reproduction of audio signals to digitize analog signals for digital communication and to process digital signals.
The new teaching method helped raise enthusiasm for study and cognition effect of the students. The students could be able to have a good understanding of what they learnt and make simulations by themselves using LabVIEW.
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Jo Oct 4, 2022
Many countries and nations in the world have wrestling, one of strength events. However, hardly any of them are comparable with Korean wrestling, which has such a long history and tradition, a strong national character and a unique form and way of playing, and is imbued with rich and optimistic national sentiments.
Korean wrestling is one of the national sports events, in which two people try to take opponents down by strength and skills holding opponents’ thigh bands or waist bands. The term ssirum (Korean wrestling) came from an archaic word “hilhuda”, which meant making every effort not to be defeated. The sound “hilhum”, the noun form of “hilhuda”, changed little by little into silhum → silum → sirum → ssirum.
Created through the labour of our hard-working people to conquer the nature, ssirum became a typical event of our national sport in ancient times and entered the track of its development. Mural paintings in Koguryo tombs including Ssirum Tomb in the period of the Three Kingdoms (late 4th century) and Jangchon Tomb No.1 (mid-5th century) give a lifelike portrayal of scenes of ssirum which was very popular in those days. In the period of Koryo, too, ssirum was widely done as a popular sporting event. It was so popular that even one of the kings of the Koryo dynasty used to do ssirum with the officials at Court, far from looking after the affairs of the state. “Ssirum” painted by Kim Hong Do, a famous artist in the 18th century, shows that Korean wrestling is a popular national sport that is simple in preparation but diverse in the ways of playing, and that it can be played anywhere anytime.
Korean wrestling has three main features: diversity in the techniques by thigh bands, giving strong stamina, fighting spirit and herculean strength, and a popularized event that can be played without any restrictions on a place, time and players.
Thanks to the warm love of Chairman
Today, under the warm care of the respected Comrade
Im Sung Bin, section head at the Academy of Social Sciences
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Jo Oct 3, 2022
“Embedded Computer Technique” is a subject that covers the principle and method of building a control system around an embedded processor using the structure and function of the processor.
In the past, all students were given the same preparation tasks and they had them checked orally. Therefore, they paid little attention to preparation and some of them made no preparations for lectures.
That is why Choe Hak Gun, a researcher at the Faculty of Communications, focused his attention on attracting his students to doing preparation tasks.
It is true that “Embedded Computer Technique” at first attracted every student’s interest as an embedded computer system has positive applications in reality, but the lectures on making and running embedded computer systems tended to make many students discouraged since the lectures are mainly focused on theories.
In order to overcome such shortcomings, he selected a simulation tool method and gave preparation tasks for which students had to use the simulation tool. With the simulation tool, the students can design circuits, write and run a program and evaluate the accuracy anytime as they want.
First, he presented preparation tasks so that they could grasp the point of the coming lecture from them. As they have already learnt about PROTEUS, simulation tool which is widely used for an embedded system, it is quite possible for them to do so.
Second, he properly evaluated how well they did their preparation tasks.
Due to the time limit, it is impossible to check everybody’s work, so he asked the students to hand in their tasks in the form of e-documents in advance. He chose the best ones among them to point out the good sides and bad sides of their tasks. It helped raise their self-confidence. In addition, he gave them chances to have a full understanding of the main point of the lecture by providing time to explain on their own.
As a result, the trend of memorizing faded out and instead many of them tried to design a circuit and write and run a program all by themselves. Some of them came up with several creative design methods and programming methods while doing their preparation tasks by the simulation tool. It resulted in the improvement in the thinking ability of the students.
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Jo Oct 1, 2022
Codechef August Long Challenge went on from August 12 to 15, 2022.
Over 23 000 contestants from tens of countries and regions including our country, China and India took part. 170 contestants competed in Division 1.
A total of 30 contestants including 10 KUT students won the first place in Division 1.
Codechef September Long Challenge went on from Sep. 9 to 12. More than 20 000 contestants from tens of countries and regions took part. Division 1 drew 140 contestants.
A total of 28 contestants including 8 KUT students took the first place in Division 1.
KUT studenst are making constant effort to hold fast to its position in the contest, which will always lead to brilliant fruition.
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Jo Sep 29, 2022
Cadmium sulfide (CdS) is an important II–VI compound semiconductor material with applications in several heterojunction photovoltaic systems including CdTe and CIGS solar cells. There are several physical and chemical deposition techniques used for deposition of CdS thin films including RF sputtering , evaporation, close space sublimation (CSS), closed space vapor transport (CSVT), metal organic chemical vapor deposition (MOCVD), chemical bath deposition (CBD), spray pyrolysis, successive ionic layer adsorption and reaction (SILAR), etc.
Among these, CBD is one of the simple stand inexpensive large-area deposition techniques. CBD is most widely used since it is not only available at low temperatures and easy to control but also it helps produce uniform, compact and adherent films.
Kim Hyon Chol, a researcher at the Faculty of Electronics, has investigated the influence of deposition parameters such as reactant concentration, bath temperature and deposition time on the CdS thin film properties when a CdS thin film, a window layer of a CdTe solar cell, was deposited by the chemical bath deposition (CBD) method without stirring.
Influence of solution concentration: When the reactant concentration is too high, the reaction rate becomes fast and the color of solution turns yellow, resulting in films with brittle nature and poor uniformity due to the adherence of a great amount of CdS precipitates onto the surface, which is undesirable for solar cell fabrication. On the other hand, low concentration leads to a decrease in deposition rate and non-uniformity of thin films. When the reactant concentration is controlled suitably, the residual solution after the reaction can be colorless to obtain uniform, compact and transparent films.
Influence of bath temperature: The bath temperature affects the surface morphology, microstructure and adhesion of CdS thin films. At lower temperatures, an abundance of CdS particles are directly deposited because of lower solubility products of CdS (Ksp). Meanwhile, higher bath temperature yields thin films of poor quality due to the increase in Ksp and the decrease in the precipitation rate. The increase in the bath temperature decreases the grain size and promotes the formation of CdS thin films.
Influence of deposition time: Deposition time influences the thickness of films with constant reactant concentration. At the initial stage of the formation of a thin film, a large number of voids made by CdS colloid particles form discontinuous films. For CdS thin films with these voids, the performance of solar cell is strongly affected by the decrease in shunt resistance. As the deposition time increases, the surface of a film becomes compact, uniform and continuous.
The measurements of transmittance were carried out for all deposition parameters. The performances of solar cells with different S/Cd ratios, the variation of the crystal phase with NH4Cl concentration and the surface morphology with the bath temperature were studied. Finally, he determined the optimum deposition parameters through the systematic analysis.
You can find more information in his paper “Effect of the reactant concentration, bath temperature and deposition time on the properties of CdS thin film prepared by the chemical bath deposition method” presented to the SCI Journal “optical materials”.
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