• Journal of applied mathematics & informatics
• /
• v.8 no.2
• /
• pp.591-611
• /
• 2001

In this paper, we classify elliptic curve by isomorphism classes over some finite fields. We consider finite field as a quotient ring, saying $\mathbb{Z}[i]/{\pi}\mathbb{Z}[i]$ where $\pi$ is a prime element in $\mathbb{Z}[i]$. Here $\mathbb{Z}[i]$ is the ring of Gaussian integers.

• Journal of the Korean Professional Engineers Association
• /
• v.38 no.2
• /
• pp.60-63
• /
• 2005

Firstly, the author suggests a new term of the "Pro-Engineer's Doctrine" on every engineering work. This renewed term should be in their minds who are doing any kinds of scientific and technological works in his/her field. The term, "doctrine", is based on a wise sage, renewedly, so-called "The Way of the measuring squire(혈矩之道)" saying in one of the Oriental classics. Also, he explains here another term, "Investigation of things, attainment of knowledge(格物致知)" that is very similarity to the "Pro-Engineer's Doctrine" from the same book.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2010.05a
• /
• pp.317-318
• /
• 2010

At the latest industry develops, heavy metals or sludge contaminated surrounding farm land and rivers. In this study, wished to solve problem by saying contaminated sludge and tailing and heavy metals to do solidification using Magnesia phosphate cement. Confirmed through above experiment that magnesia is effect in solidification and stabilization of chromium and lead.

• Journal of Industrial Technology
• /
• v.16
• /
• pp.25-30
• /
• 1996

The waste foundry sand might be recycled in concrete, resulting in energy saving and environmental protection. An half Factorial Experiments were performed with the variables of W/C ratio, S/A, Sand/Waste foundry sand ratio and Slump as a preliminary study for optimum mix design of concrete. The results show that then W/C ratio is the most important factor to the concrete strength. The substitute of waste foundry sand up to 30% has little influence, saying that it can substitute the fine aggregate without damaging the concrete properties.

• Journal of Industrial Technology
• /
• v.16
• /
• pp.39-44
• /
• 1996

The waste basalt might be recycled in concrete, resulting in energy saving and environmental protection. An half Factorial Experiments were performed with the variables of W/C ratio, S/A, Crushed stone/Basalt ratio and Slump as a preliminary study for optimum mix design of concrete. The results show that the W/C ratio is the most important factor to the concrete strength. The substitute of waste basalt up to 100% has little influence, saying that it can substitute the coarse aggregate without damaging the concrete properties.

• Proceedings of the KIEE Conference
• /
• 2001.07e
• /
• pp.67-71
• /
• 2001

Nowdays, we can communicate using Information Technology such as internet, personal computer, mobile phone etc. To protect global environment, it is also reqired to invent products efficiently reduce energy consumption. here, I studied organic EL and inorganic EL because organic EL display is appropriate device as light, thin, energy-saying display following CRT, LCD. As a result, I realized that we are supposed to study more on invention, efficiency and mass-production of materials. Comparing with another display, however, it would be marketable in few years, considering short history of its full-scaled studies.

• Proceedings of the Korea Concrete Institute Conference
• /
• 1996.10a
• /
• pp.58-63
• /
• 1996

The waste foundry sand might be recycled in concrete, resulting in energy saving and environmental protection. An half Factorial Exprements were performed with the variables of W/C ratio, S/A, Sand/Waste foundry sand ratio and Slump as a preliminary study for optimum mix design of concrete. The results show that the W/C ratio is the most important factor to the concrete strength. The substitute of waste foundry sand up to 30% has little influence, saying that it can substitute the fine aggregate without damaging the concrete properties.

• Proceedings of the Computational Structural Engineering Institute Conference
• /
• 1990.04a
• /
• pp.1-5
• /
• 1990

The object of this study introducts simple formula being based on energy principle to investigate span truss's non-linear, and considers the relation of member's length, height rate and slenderness ratio to rise prymid truss's economic structure ability through each example. This paper considered space truss's geometric non-linear behavior and material non-linear behavior, so acquired under result through as saying energy principle.

• International Journal of Computer Science & Network Security
• /
• v.21 no.9
• /
• pp.317-322
• /
• 2021

The modern technological era has brought about the Semantic Web. Ontologies are essential to achieve the vision of the Semantic Web. Ontologies enable machines to understand data. The Arabic Language currently does not have a significant presence on the Web. To achieve a comparable level of Arabic access to other important languages, further work is needed to build Arabic ontologies. A goal is to design and create a robust Arabic ontology that represents the concepts from a large and significant subset of Arabic. We use a source of Hadiths (prophet saying and deeds) from Riyadh As-Saliheen. Preliminary results are very promising.

• Journal of Korean Medical classics
• /
• v.30 no.3
• /
• pp.55-76
• /
• 2017

Objectives : The transition of the 29 diagrams of Heart originated from MingTangZangFuTu will be used to understand the shape of heart and the changes of people's understanding of heart. Methods : The 29 diagrams of Heart originated from MingTangZangFuTu are divided according to their shape elements (Heart itself, internal curvatures, structures above heart, wuzangxi, and excursus). Then its transitions are analyzed, and each shape element is compared to modern anatomy and its textual basis is searched. Results : The lengthy cylinderical organ situated above the heart is composed of upper part consisting with joints and the lower part void of joints. The upper part is Pyewan (such as the lungs) and fall into trachea. The lower part is Xinxi or Feixi which are either relative vein (or aorta) or left bronchus that passes behind the heart. This depiction of the structures around the heart can be considered to have composed by actual observance of a physical heart, a method that is similar to anatomy. However, the shape of the heart itself is described as a lotus flower that has not been bloomed, a depiction which finds its origin from Zhongguangbuzhu huangdineijing suwen (762). The three short curvatures inside the heart is described as Pericardium, influenced by Shisijingfahui (1341) in its depiction, or as sammo, influenced by Nanjing. Structures that are connected directly from the heart to spleen, kidney, and uterus are not found in modern anatomy. The saying in Excursus "All cords of five internal organs belong to heart" is based on Huatuoxuanmenneizhaotu, and this is changed to the saying cords of four internal organs belong to heart in Leijingtuyi for the first time. Conclusions : The authors of medical scriptures at the time did not have a method of direct observance when they were copying heart diagrams. Therefore, they made changes to the source material's diagram and excursus while being influenced by Nanjing, Huatuoxuanmenneizhaotu, and Shisijingfahui. Then the doctors' understandings with regards to the shape and function of heart were reflected during that process.