• Journal of Physiology & Pathology in Korean Medicine
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• v.17 no.1
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• pp.50-56
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• 2003

This research was done to make the effective prescription and cope with various senile dementia. So Sprague-Dawley rats were injected with ibotenate to make a damage on learning and memory functions. At first acquisition test and retention rest were done in the Morris water maze. And to evaluate the effects of the sample drug(TBM) on choline acetyltranferase and acetylcholine esterase, immunoreactive measurement and enzymatic activity measuring were carried out. The ibotenic acid were injected to hippocampus CA1 and CA3 area. The results were as following. TBM improved the learning ability in the acquisition test and memory function in the retention test significantly. And TBM increased the level of ChAT which is synthesizing acetylcholine in CA3 area, and at the same time it increased the level of AChE which is resolving acetylcholine. These results show that T8M improved the cholinergic catabolism and anabolism, and the increment of metabolic activity of cholinergic system. In other words, it contributes to the recovery of damaged learning and memory function by ibotenic acid. So it can be concluded that TBM will be helpful to cholinergic brain damage induced by primary or senile reduction of acetylcholine secretive activity.

• Korean Journal of Heritage: History & Science
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• v.45 no.3
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• pp.80-99
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• 2012

It is known that there are two Gabong taesil (shrine for King's umbilical cord) of King Danjong, the 6th king of Joseon, remaining today. One of them is Mt. Sogok in Sacheon-city, Gyeongsangnam-do and the other is Mt. Beomnim in Seongju-gun, Gyeongsangbuk-do. The academic sector argued about this matter as there cannot be two Gabong taesil for one king. I once argued that Taesil on Mt. Beomnim in Seongju is King Danjong's Gabong taesil and Danjong taesil in Sacheon is the one for Prince Inseongdaegun, the eldest son of King Yejong. At that time, however, I had not examined the archaeological relics found in these places. In result of making an archaeological approach, I have come to the following conclusions :1. King Danjong had two Taesil : Agi taesil(shrine for baby's umbilical cord) and Gabong taesil. The first Agi taesil was created on Taebong of Mt. Seonseok in Seongju on November 26, 1441, but was moved to Mt. Beomnim in Seongju in 1451 to form the second Agi taesil. In 1458, King Sejo eliminated his Taesil. The stone structures of Gabong taesil still remains on Taebong of Mt. Beomnim, so it has been assumed that King Danjong established them during his reign (1452-1455). 2. Taesil in Sacheon has been known as King Danjong's Taesil because of King Danjong's reinstatement during the reign of King Sukjong. His Taesil was repaired with the reinstatement and King Sukjong was mistaken that Taesil in Sacheon was King Danjong's Taesil to fix it. The time of restoration has been assumed to be soon after the restoration of King Danjong's tomb (1699-1719). Taesil is missing the book of records and rails around the stone structure because the tombs of reinstated kings were restored without rails. 3. It is incorrect that Taesil in Sacheon was known as King Danjong's Taesil, It has been concluded that this Taesil was for Prince Inseongdaegun who was born in 1462. I focused on the fact that Prince Inseongdaegun's Taesil was in Seosamneung Taesil instead of King Danjong's Taesil. When Yiwangjik stored King Danjong's Taesil in Seoul in 1928 and moved it to Seosamneung in 1930, he found that the epitaph on the tombstone recorded that it was Prince Inseongdaegun, not King Danjong, and created Prince Inseongdaegun's Taesil in Seosamneung. I referred to "Taebong", which was created when Seosamneung Taesil was built during the Japanese imperial rule over Joseon, and the relics found in Taesil in Sacheon and Seosamneung.

• Korean Journal of Heritage: History & Science
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• v.46 no.1
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• pp.76-101
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• 2013

In this article, we examine the Taeshil of King Jungjo, the 22nd King of the Joseon dynasty located in Yongwol, Gangwondo. The Jangtae culture - burial of the navel cord - is a unique Royal ritual which began during the Shilla dynasty and continued to be carried out for a long period until the Koryo and Joseon dynasties. Until today, about 300 Taebong sites have been discovered, most of which are the Taebong of the decedents of the royal family of the Joseon Kingdom. Most Taeshils built for Kings of the Joseon dynasty were destroyed during the Japanese colonial period, among which only a few have been recovered and managed across the nation. The Taeshil of King Jungjo is one of the leading examples among existing Taeshils in Korea which has managed to preserve well enshrined relics as well as literature documents including stone relics in perfect sets. Thus, in order to examine the Taeshil of King Jungjo comprehensively, first of all literary materials related to the construction of King Jungjo's Taeshil such as the Josunwangjosilrok - "Annals of the Choson Dynasty (朝鮮王朝實錄)". "Jungjongdaewang Taesilgabong Euigwe (正宗大王胎室加封儀軌) - Royal activities related to Taeshil, and local historic documents etc were searched and put together, while a focus was placed on examining the geographical location and state of the Taebong, including the specific style of each part of the Taeshil stone and characteristics of enshrined relics. Such materials are believed to have important utility in the future as a basic material to be used for research, maintenance, and restoration of Taeshil relics. So far, Taeshil relics is a field that has not been able to attract much attention from the academic world, however attention has begun to be paid to Taeshil relics due to recent archaeological excavations as well as an approach to artistic history. Academic research results are expected if Taeshil relics are able to be examined comprehensively in future covering various areas such as literature history, archaeology, and artistic history etc.

• Journal of the Korean GEO-environmental Society
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• v.14 no.1
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• pp.33-42
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• 2013

In this paper, a series of monotonic undrained shear tests were carried out on four kinds of sand-fine mixtures with various fines content. Two kinds of sands (Silica sand V3, V6) and fines (Iwakuni natural clay, Tottori silt) were mixed together in various proportions, while paying attention to the void ratio expressed in terms of sand structure $(F_c{\leq}F_{cth})$. The undrained shear strength of mixtures below the threshold fines content was observed so that as the plastic fines content increases, maximum deviator stress ratio decrease for dense samples while an increase is noted for loose samples. For non-plastic fines, the increase in the amount of fines leads to an increase in density of the soil, which results in an increase in strength. Then, the monotonic shear strength of the mixtures was estimated using the concept of granular void ratio. It was found that the shear strength of mixtures is greatly dependent on the skeleton structure of sand particles.

• Journal of the Korean GEO-environmental Society
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• v.20 no.1
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• pp.13-17
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• 2019

This paper presents case history of railway embankment excess settlement on soft clay during service in southern region of Korea. A lot of field observations show that the measured settlements are a lot larger than settlements actually calculated in this area. Back analysis is carried out to verify the soil parameters which are intended to investigate in the subsurface exploration phase and later in a laboratory test program. Recommendations and causes for the engineering practice are suggested to review the determination of excess settlements and, consequently, to improve the settlement prediction. This enormous discrepancy is due to the passing over secondary consolidation, and the design filling did not meet to real construction filling. Immediate settlement could be subsidiary factor of excess settlement.

• Journal of the Korean GEO-environmental Society
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• v.23 no.9
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• pp.25-31
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• 2022

Attaching shelf to retaining structure leads to a decrease in the total lateral earth pressure. This decrease enables the retaining structures to become more stable, to have small displacement, and to exhibit lower bending moments, the relief shelves effects are analyzed using FEM in order to understand how they stabilize cantilever wall in this study. Several models are varied by changing location and width of shelves to realize earth pressure and displacements of retaining wall. The displacement is getting smaller because earth pressure acting on shelf increases as shelves locations are lower and width is longer. The ground settlement variation effects caused by relief shelves are studied also. The ground settlement increases abruptly where shelf location is between of 0.5H and 0.625H, and settlement decreases suddenly where shelf width is between b/h=0.375 and b/h=0.500. The shelf significantly reduces earth pressure and movement of the wall. This decrease in the lateral pressure increases the retaining structure stability.

• Journal of the Korean GEO-environmental Society
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• v.9 no.5
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• pp.15-20
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• 2008

Compressibility of the marine clay was mainly studied velocity of consolidation and numerical analysis by this time but studies of reevaluated from the field measurement data was a little. For last three years, areal fills and extensive field instrumentations including settlement and pore water pressure were performed in the site of the Youngsan River estuary site, South Korea. From the settlement data, field consolidation curves for sub-layers were reconstructed. Effective surcharge loads during the staged loadings were calculated using the fill heights and the excess pore water pressures in the ground. In the numerical analysis (PLAXIS), prefabricated vertical drains were also simulated. Laboratory, field, and numerical analysis showed good agreements in compressibility. Due to different conditions and limitations of the clay was the same range of the oedometer tests.

• Korean Journal of Plant Resources
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• v.27 no.3
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• pp.249-255
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• 2014

The rice belonging to Oryza sativa is not only has significant economic importance, for it is the major source of nutrition for about 3 billion all around the world. But also plays a vital role as a model organism, because it has a number of advantages to be a model plant, such as efficient transformation system and small genome size. Many methods and techniques have been conducted to attempt to distinguish different Oryza sativa species, such as amplified fragment length polymorphism (AFLP), random amplified polymorphic DNA (RAPD), simple sequence repeat (SSR) and so on. However, studies using sequence analysis of internal transcribed spacer (ITS), a region of ribosomal RNA has not been reported until now. This study was undertaken with an aim to understand the phylogenetic relationships among sixteen isolates of Oryza sativa collected from abroad and fifteen isolates collected from Korea, using ribosomal RNA (rRNA) internal transcribed spacer (ITS) sequences to compare the phylogeny relationships among different Oryza sativa species. The size variation obtained among sequenced nuclear ribosomal DNA (nrDNA) ITS region ranged from 515bp to 1000bp. The highest interspecific genetic distance (GD) was found between Sfejare 45 (FR12) and Anapuruna (FR15). Taebong isolate showed the least dissimilarity of the ITS region sequence with other thirty isolates. This consequence will help us further understanding molecular diversification in intra-species population and their phylogenetic analysis.

• Journal of the Korean GEO-environmental Society
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• v.17 no.11
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• pp.45-53
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• 2016

A precast panel wall system resists against the horizontal earth pressure by increasing the shear strength of ground by reinforcement connected to the panel. The application of precast panel wall system is growing to lately minimize the earth work and environmental damage caused by large cut slope and to use the limited land effectively. The ground adhered panel wall system is the construction method that has the panel engraved with natural rock shape to improve the landscape. This system is developed to complete Top-Down method, and it is possible to have vertical cut, and to adhere to in-situ ground, improve construction ability by minimizing the ground relaxation and exclusion the trench and backfill process. In this study the field tests were performed to verify the construction ability about the vertical cut and complete Top-Down process and the construction behavior of ground adhered panel wall system was analyzed by large scale loading test and measurement results during loading test.

• School Mathematics
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• v.9 no.4
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• pp.447-466
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• 2007

Math education in schools have to enable students to understand the importance of math and nurture the capacity to resolve various problems in daily life with reasoning, which is therefore, always applicable to the actual world. Proportional reasoning capacity is being often used in daily life, and some kind of unit is not fixed. So students are considering it very difficult. This study looks into the difficulties that students have in proportional reasoning, what kind of problem solving strategy is being used, what the problems are in current textbooks, etc. Based on this, it tried to check the concept changes in students' proportional reasoning by developing the instruction program for 'proportional expression' unit in the 6th grade. Based on the results, this study analyzes the features of proportional reasoning instruction programs and the instruction results. Also it analyzes in-advance & after examination papers of the experimental class and comparison class to contribute to the instruction method and instruction contents improvement of 'proportional expression' unit.