Jo Feb 19, 2022
Pak Il Chol, a researcher at Faculty of Information Science and Technology, has developed a Java API compound retrieval program on the basis of the collection of code snippets and feature extraction. In this program it is possible to realize ranking of code snippets suitable for user intention from their application degree and brevity degree.
He increased the rate of indexing by 0.3GB per hour and the precision and recall by 6% and 9% respectively, which resulted in the improvement of the development speed and quality of programs. Thus, he ensured the guarantee for reducing the labour and time needed for program development to one tenth.
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Jo Feb 18, 2022
Learning and concentration are closely connected. High concentration supports successes in study.
To improve concentration, pupils need to form a proper habit just when they start studying, that is, when they are in the first or second grade at primary school. The concentration of pupils at this age does not last long but soon fades away.
Pupils with low concentration are not be able to pay attention to the teacher, and when they study at home, they spend about an hour doing homework that needs only 10 minutes or so.
Parents should try to create an environment to make their children concentrate on their study before they get started.
To improve the concentration of primary school pupils, parents should subdivide the stages of study to make them active.
The stages of study are divided into 5.
Stage 1: Make clear what they have to do.
Before study, you should ask your children questions like “What are you going to do today?” or “What is your homework?”.
If they answer, “I have no idea.”, you should not tell them immediately what to do but instead lead them by making them check their homework books or asking necessary questions.
For example, “What do you have to do before you practice playing the accordion?” will remind them of what to do. Then they come to realize what homework they have to do.
Stage 2: Make a study plan.
After deciding what to study, they have to plan how to do their homework. By asking questions like “How long will it take you to do homework?” or “Which homework are you going to do first?”, you can encourage them to predict how long it will take and to make an effective plan. If they have too much homework, you can help them break it into several parts lest they feel bored and tired.
You should grasp how long your children can keep their concentration steady in order to split homework suitable for their concentration time. If your child can concentrate for up to 10 minutes, you should give them homework that can be done in 10 minutes. After that, you let them take a break before you get them to study for another 10 minutes with fresh concentration. You should lengthen their study hours gradually. Do not regard 10 minutes to be too short. You should make them study for a long time within the range of their concentration.
Stage 3: Keep to the plan.
When they have decided what and how to do, they can start studying. When they are studying, you do not need to talk to them often. However, as soon as you notice that they are likely to deviate from their early plan, you have to awaken them with questions such as “What are you doing now?” or “Check if there is none missing.” so that they can keep to the plan. When they take a break, you can check what they have done. If they finish their task earlier than planned, you should praise them.
Stage 4: Recollect.
When they have finished their homework, questions like “What was the most difficult part in your homework for today?” or “Before you close your book, make sure you do not have anything missing or wrong.” can be followed.
This will help you know and your children look back on how well they did their homework. This is another step of revision. Even though they have loads of wrong answers or fail to have a full understanding of what they have learnt, you must not get angry with them.
Stage 5: Lavish praises.
A primary school pupil with low concentration might yield to various kinds of temptation. Therefore, in order to help them go through these 4 stages smoothly, you have to praise and encourage them as much as possible. In this way, they will find it happy to study with confidence and to keep up with their plans.
For example, you can make them have confidence in study, saying, “I am so happy to see that you are trying hard.” and so on.
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Jo Feb 17, 2022
Ri Sok Chol, a section head at the Faculty of Metal Engineering employed genetic programming (GP) to derive a CaO-SiO2-Al2O3 slag viscosity equation and presented an algorithm for it.
Slag viscosity is a key property that determines the stability and productivity in the metallurgical furnace operation, and it is of great importance in understanding the fluid dynamic of molten slags and slag-metal reaction kinetics during the pyrometallurgy process.
Up to now, there have been many experiments to measure, and models to estimate slag viscosity. Viscosity models can be classified into explicit models, structural models, and miscellaneous models according to the way in which they are connected to the description of slag structure.
A slag viscosity equation described with only slag composition and temperature was successfully derived by genetic programming (GP).
The viscosities of CaO-SiO2-Al2O3 system slag can be simply and expediently calculated in a wide range of compositions and temperatures by using the derived viscosity equation.
The average relative error between the values obtained by the equation and the experimental data used for its derivation is as low as 17.1%. To evaluate the accuracy of the viscosity equation of CaO-SiO2-Al2O3 system slag, experimental data and results calculated by many researchers and not used for the derivation of the viscosity equation were compared, and a reasonably good agreement was demonstrated between the results calculated by viscosity equation and other researchers’ experimental and calculated data. The calculation of viscosity showed higher accuracy than previous models.
His essay “Derivation of CaO-SiO2-Al2O3 System Slag Viscosity Equation by GP” was carried in SCI Journal “Journal of Mining and Metallurgy, Section B: Metallurgy”.
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Jo Feb 14, 2022
Kang Po (late 13th century – early 14th century) was a famous astronomer and a mathematician in Koryo.
He found a solution to a biquadratic equation which was not found until the 19th century in Europe. Thus, he made the most advanced and correct calendar in the world of those days “Susiryok” (a primitive calendar) and even a numeration table for easy correction of them.
Those days when farming held an overwhelming proportion in the economy, it was of vital importance to make a calendar that showed correct subdivisions of the seasons.
At that time people used a lunar calendar where there were 354.370 5 days in a year, so after 33 years there was a gap of about 1 year between solar and lunar calendars. Therefore, it was impossible to figure out which season a particular month belonged to.
In order to overcome this shortcoming, lunar calendars had to undergo a huge mathematical calculation for the correction of seasons
Nevertheless, limited mathematical knowledge of those times made it difficult to upgrade calendars every year.
Kang Po, who passed the state examination in 1294, volunteered to shoulder the heavy burden of making a calendar.
He made a correct calculation of the orbit of the sun according to the 24 divisions of the year, on the basis of which he succeeded in making a new correct calendar called “Susiryok”
Not satisfied with this, he decided to find a system of calculation for easy and constant correction of existing calendars.
With painstaking studies and efforts, he discovered his own original formula which is now known as x4＋ax2＋bx＋c＝0, and formed a numeration table “Susiryokripsong” necessary for calendar correction.
People in the neighbouring countries expressed their admiration and envy, saying that this was the very world-shaking miracle and that Koryo was a great power of culture.
The Yuan Dynasty not only introduced his new Susiryok as it was but also published his numeration table in the book “Taedongthonggwe”.
Having devoted all his life to improving a calendar, he wrote a book “Susiryokchopbopripsong”, where he made known the secrets of his calendar in 1343.
This is the oldest one of all the astronomy books known to the world so far.
It was not until the 19th century that Hono, a British mathematician, obtained a biquadratic equation. Kang Po was indeed a world-famous astronomer and a great mathematician.
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Jo Feb 13, 2022
Jang Jong Hyok, a researcher at Faculty of Applied Mathematics, has developed a teaching aid program for numerical analysis suitable for students’ psychological characteristics and engineering applications. Students are using this program to deepen their knowledge of numerical analysis.
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Jo Feb 10, 2022
Sin Sa Im Dang is a famous female painter and the mother of a great scholar Ri Ryul Gok.
Sin is her last name and Sa Im Dang is her pen name. She was born into a ryangban (aristocratic) family in Kangrung, Kangwon Province.
Her father, Sin Myong Hwa, despite his excellence in learning and virtue, kept himself from the service in the government.
Instead he remained jinsa (a person who has passed the primary state examination only) all his life devoting himself to the education of the rising generation. Her mother Mrs. Ri was simple and honest, yet strict and generous in the education of her children.
Sin Myong Hwa had no sons but five daughters, the second of whom was Sa Im Dang.
Having started studying when she was a very small child, she was good at everything like composition, penmanship, painting, embroidery, etc.
Especially, she was brilliant at painting. At the age of 7, she caught people’s admiration by painting a landscape and grapes with An Kyon, a famous painter in the 15th century as her model.
This was such a progressive style of painting as a number of contemporary artists were immersed in painting exotic scenery and 4 noble characters (Japanese apricot blossom, orchid, chrysanthemum, bamboo)
Her masterpieces still found include “Eggplant”, “Grapes”, “Mallard”, “Mandarin Fish”, “Heron in a Pond”, etc.
Her paintings were so lifelike that when she put out a painting in the yard, cocks and hens flocked together to peck at the insects in it. When a woman was worried about her borrowed skirt soiled in a wedding, Sa Im Dang painted a delicious-looking bunch of grapes on it. These stories show the distinct creative personality of a fine warm-hearted woman artist who loves her life and is rich in national emotion.
Her patriotism and profound humanity were also reflected in her poems and education of her children. At the age of 19, she got married to Ri Won Su, who was working as a kamchal, a position pretty low in official rank. Soon afterwards, her father died and she moved to Hansong for a married life with her widowed mother left alone. She never forgot her native village and her mother.
One day she was pleased to visit her mother after a long time. After some days of pleasure and happiness, she had to part from her mother. With tears in her eyes, she composed a poem on Taegwan Pass (a big pass across the road from Kangrung to Hansong) looking over her native village and yearning for her mother
As a fine mother, she paid a great deal of attention to the education of her children.
She had 4 sons, all of whom she exercised strict control over with fixed quantities of study every day so as to bring them up to be talents serving their country.
Her children, under the influence of their mother, studied hard to become famous. Among them, her third son Ri I (pen name – Ryul Kok) was distinguished.
From the age of 3, he learnt to read and at the age of 8 he composed a poem, thus startling people. Having passed the primary state examination at the age of 13, he consecutively served in various government posts for over 30 years. During this period he proposed a number of patriotic measures for developing the country and strengthening the national defense. Besides this, his fame as a great scholar reached far-away Ming and Japan. Her youngest son, Ri U, who inherited delicate penmanship from his mother, was also a noted calligrapher.
Sin Sa Im Dang, a famous woman artist and a mother who brought up their children to be able talents, passed away at the age of 48.
Although she failed to produce works of art based on reality, which showed her social and class limitations, she managed to paint beautiful lifelike coloured pictures contrary to the subjective black and white drawings that reflected the hobbies of feudal rulers of that time.
This served as a notable contribution to the development of realistic Korean painting.
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