• The Journal of Engineering Geology
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• v.26 no.3
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• pp.325-330
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• 2016

The second phase of low- and intermediate-level waste (LILW) disposal facility is under planned on the sedimentary rock in unsaturated zone. In this study, we created two meshes which were a matrix continuum mesh and a fracture continuum mesh to carry out 2 dimensional numerical modeling for groundwater flow in the unsaturated zone containing fractures focused on the second phase of LILW disposal facility. Two continuum meshes were developed using MINC in meshmaker module of TOUGH2 code. A fracture continuum mesh was included the k-field distribution of the permeability derived from the Discrete Fractured Network (DFN) modeling. To apply the unsaturated zone for the modeling, the gridding steps to generate mesh were developed. Each step to generate a mesh consisted of definition of materials, setting the initial conditions and creating grids using MINC. The methodology development of meshes in this study will be applied for more precise modeling of groundwater flow and mass transport.

• Journal of the Society of Disaster Information
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• v.10 no.3
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• pp.358-365
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• 2014

North Korea has been preparing for WMD(Weapons Mass Destruction) using asymmetric force since it recognized the economic effects of CBR (Chemical, Biological, Radiological) weapons system operation and the limitations of conventional weapons. However, the threat only to conventional bombs, missiles and etc. is considered on the current Civil Defense Shelter, which could increase civil damages, not responding appropriately to disasters such as CBR weapons, terror attacks and etc. Therefore, this study confirms the current situation of Civil Defense Shelter and design criteria focused on CBR disasters so that we could make a plan and design of Civil Defense Shelter. In addition, we suggest the research result and improvements on Civil Defense Shelter and Design.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.35 no.3
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• pp.183-190
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• 2022

The construction of an underground silo structure was the first stage of erecting the Gyeongju low-and-intermediate-level radioactive waste disposal facility. The facility, completed in 2014, has a scale of 100 000 drums and is currently in operation. The underground silo structure, 25 and 50 m in diameter and height, respectively, consists of cylindrical (for storing waste packages) and dome parts. The dome is divided into lower (connected to the operation tunnel) and upper parts. The wall of the underground silo structure is an approximately 1-m-thick reinforced concrete liner. In this study, finite element analysis was performed for each phase of the construction sequence and operation of the underground silo structure. Two-dimensional axial symmetric finite element analysis was implemented using the SMAP-3D program. Three-dimensional finite element analysis was also performed to examine the reliability of the two-dimensional axial symmetric finite element model. The structural behavior of the underground silo structure was predicted, and its structural safety was examined.

• Journal of Ginseng Culture
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• v.5
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• pp.21-31
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• 2023

Korean ginseng, a special product of Korea, has been one of the most important exports since the era of the Three Kingdoms. However, not many records were kept about ginseng in Korea until the Goryeo Dynasty. This paper summarizes the records relating to international diplomatic relations and trade of ginseng in the Goryeo Dynasty and the medicinal books known to have been published at the time. During the Goryeo Dynasty, ginseng was actively transported to the neighboring countries of Bohai, Song, Wa, Later Jin, and Yuan as a diplomatic gift or as a trade item. Ginseng was mainly exported from Goryeo to these countries, but it was also received as a diplomatic gift from Bohai and Khitan. Arabian merchants came to Byeokran Port, a representative international trading port of Goryeo, and traded ginseng. After the Mongol invasion, the demand for ginseng in the Yuan Dynasty was excessive, which became a big social problem. During the Goryeo Dynasty, several medicinal books were published, including Jejungiphyobang, Eouuichwalyobang, Hyangyakgobang, Samhwajahyangyakbang, Hyangyak Hyemin Gyeongheombang, Hyangyak Gugeupbang, and Biyebaekyobang. Hyangyak Gugeupbang, which was reprinted during the Joseon Dynasty, has been handed down to the present time, although this has not been the case for the originals of the remaining books. Recently, some of the latter books have been restored through the study of the references in various medicinal books of later generations. While the medicinal books used in the royal court showed that a high proportion of the prescriptions containing ginseng, not a single prescription for ginseng has been found in theHyangyak Gugeupbang, which was mainly used for commoners. This is thought to be because ginseng was very rare and expensive at the time, so it was difficult for commoners to access it.

• Journal of Animal Science and Technology
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• v.46 no.4
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• pp.509-516
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• 2004

This study is to investigate the amount of biased estimates for heritability and genetic correlation according to data structure on marbling scores in Korean cattle. Breeding population with 5 generations were simulated by way of selection for carcass weight, Longissimus muscle area and latent values of marbling scores and random mating. Latent variables of marbling scores were categorized into five by the thresholds of 0, I, 2, and 3 SD(DSI) or seven by the thresholds of -2, -1, 0,1I, 2, and 3 SD(DS2). Variance components and genetic pararneters(Heritabilities and Genetic correlations) were estimated by restricted maximum likelihood on multivariate linear mixed animal models and by Gibbs sampling algorithms on multivariate threshold mixed animal models in DS1 and DS2. Simulation was performed for 10 replicates and averages and empirical standard deviation were calculated. Using REML, heritabilitis of marbling score were under-estimated as 0.315 and 0.462 on DS1 and DS2, respectively, with comparison of the pararneter(0.500). Otherwise, using Gibbs sampling in the multivariate threshold animal models, these estimates did not significantly differ to the parameter. Residual correlations of marbling score to other traits were reduced with comparing the parameters when using REML algorithm with assuming linear and normal distribution. This would be due to loss of information and therefore, reduced variation on marbling score. As concluding, genetic variation of marbling would be well defined if liability concepts were adopted on marbling score and implemented threshold mixed model on genetic parameter estimation in Korean cattle.

• Management & Information Systems Review
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• v.37 no.2
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• pp.87-108
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• 2018

This article explores the international trade flow of Bangladesh's ready-made garments (RMG). We first suggest the brief history and an international structure of trade among countries by using the trade volume. Then we implemented a gravity model regression with the sample of 38 major partner countries in order to investigate the potential export market for the RMG industry. The fixed effect and random effect model for the panel data during the period of 1990 to 2011 are estimated. Our result shows that Bangladesh's RMG exports are affected positively by the size of economy, inflation, exchange rate, foreign direct investment(FDI) and trade openness. On the other hand, the distance between trading partners are related negatively with the trade volume. We used the estimated coefficients from the panel regression in order to predict RMG export potential of Bangladesh. This might show which country is the promising export market for Bangladesh RMG industry. We found that Bangladesh has the highest potential of RMG export with Japan and USA, which seem to have considerable room for export growth if trade barriers and constraints are removed. We added some policy implications for encouraging the RMG export of Bangladesh by using the results from the analysis.

• Journal of Korean Medical classics
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• v.19 no.2 s.33
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• pp.294-300
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• 2006

왕숙화(王叔和)의 저작으로 알려진 ${\ulcorner}$맥경${\lrcorner}$은 중국의학사상 매우 중요한 지위를 차지하고 있다. 현재 사람들이 이 책을 중시하는 것은, 진단학의 저작일 뿐만 아니라, 그 가운데 장중경(張仲景) ${\ulcorner}$상한론(像寒論)${\lrcorner}$, ${\ulcorner}$금궤요약방${\lrcorner}$의 내용을 수록 하고 있기 때문이다. 따라서 이 책의 연구를 통해 장중경(張仲景)의 의학문헌 발전사를 살펴볼 수 있다. 본문에서는 ${\ulcorner}$맥경${\lrcorner}$과 중경(仲景)의 ${\ulcorner}$금궤${\lrcorner}$의 편장(篇章)의 목록사이의 관계를 비교하여 토론하였다. 고보혀(高保衝) 등 송신(宋臣)의 교정을 거친 ${\ulcorner}$맥경${\lrcorner}$은 비록 권수가 바뀌지 않았지만 그 내용이 여러 전적을 참고하여 이루어졌다. 중복된 글을 삭제하고 빠진 곳을 채워서 편제가 많이 바뀌어서 부류에 따라 귀속하였으므로 중대한 변화가 발생하였다. 인용문의 통계분석에 따르면, 현본 ${\ulcorner}$${\lrcorner}$ 가운데 제 1, 5, 9, 13, 19, 23편 외에, 나머지는 모두 혹은 대부분 ${\ulcorner}$맥경(？？)${\lrcorner}$에 나온다. 둘의 글자를 비교하면, 조문이 같은 것이 대부분이며, 글자가 다른 곳도 있다. 이들을 ${\ulcorner}$맥경${\lrcorner}$의 글자가 분명히 ${\ulcorner}$금궤${\lrcorner}$보다 많은 것, ${\ulcorner}$맥경${\lrcorner}$ 및 ${\ulcorner}$금궤${\lrcorner}$의 동일 조문을 서로 교정한 것 ${\ulcorner}$맥경${\lrcorner}$ 및 ${\ulcorner}$금궤${\lrcorner}$에서 피해(避害) 인해 같은 조문의 글자가 다른 것 등의 세 가지로 나누어 토론하였다. ${\ulcorner}$맥경${\lrcorner}$과 중경의서(仲景書件)의 편장목록의 비교하여 필자는 만일 왕숙화(王叔和)의 ${\ulcorner}$맥경${\lrcorner}$ 권7의 원래의 존재에 대해 완전히 부정한다면 받아들이가 어려울 것으로 본다. 본문에서 설명한 것처럼, 송신(宋臣)이 ${\ulcorner}$맥경${\lrcorner}$을 정리할 때 당시의 몇 종류의 류핸본(流핸本)을 참고하였으며, 그들은 원래의 구조에 의거하여 이 책을 10 권으로 교간(校刊)하였다. 아마도 원서의 권 7 내용이 풍부하지 않았으므로, 송신은 기타의 책을 참조하여 보충하고 수정하였으며, 추측컨대 권8, 권9도 또한 이러한 가능성이 있다. 이러한 점은 송선이 이미 서문에서 강조하여 설명한 ‘중복된 것을 제거하고, 빠진 것을 보충하였으며 그 편제도 또한 상당히 개역하여 부류에 따라 맞추도록 하였다’ 라는 것이다. 어쨌든, 중경(件景)의 ${\ulcorner}$금궤요약방${\lrcorner}$의 유전과정에서 ${\ulcorner}$맥경${\lrcorner}$은 매우 중시할 만한 문헌의 하나인 것이다.

• Journal of Conservation Science
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• v.35 no.2
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• pp.177-186
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• 2019

A Termiticide that is applied to the soil treatment method, one of the methods for preventing termites in Korea's wooden cultural properties, will be subjected to the leaching of the effective ingredient in treated soil by the moisture behavior of rain. As a result, termiticide is deteriorated and needs to be reprocessed, but the standards and evaluation methods are nonexistent in korea. Accordingly, a basic indoor evaluation measure was proposed for the evaluation of the effectiveness of the termiticide chamber and the calculation of the reprocessing period. First, avoidance and contact toxicity were assessed at two concentrations of the same termiticide as a method for assessing termiticide suitability. The evaluation of mortality revealed that the soil termiticide used in this experiment was non-repellent, and that death from contact was confirmed. Afterwards, artificial rainfall and soil penetration tests were conducted to determine efficacy of termiticide in soil and the approximate reprocessing period was calculated by comparing the weather data. Persistence evaluation revealed perforation by termites after continuous water exposure of more than about 160 to 170mm of water injection condition. Based on the results, compared with weather data for the last five years, the termiticide of concentration used in this experiment is expected to remain effective for about one year if treated after September. The purpose of this study was to provide basic data for the establishment of a manual for the selection of termiticide for soil treatment by calculating the efficacy for termite mortality and the duration of the leaching effectiveness by water behavior in soil.

• Journal of the Korean Vacuum Society
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• v.16 no.1
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• pp.58-64
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• 2007

Tissue engineering and regenerative medicine(TERM) is the application of principles and methods of engineering and life sciences to creat devices or biological substitutes for study, restoration, modification, and assembly of functional tissues. TERM is an emerging interdisplinary area of research and development that has the potential to revolutionize methods of health care treatment. Current status and trend of TERM's R&D is reviewed in this paper in respect to the prospective of future needs.

• The Journal of Korean Institute for Practical Engineering Education
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• v.3 no.1
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• pp.183-192
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• 2011

In recent years there has been an increasing focus on global warming and the exhaustion of resources caused by the heavy consumption of fossil fuels. In order to resolve these issues, biomass has gained much attention as a source of renewable energy. One area of particular interest has been the production of biodiesel. The biodiesel produced by the transesterification of vegetable oils, animal fats and waste cooking oils is expected to be one of the eco-friendly biomass-based alternatives to fossil fuels. This paper reviews some of the recent findings for the effective biodiesel production system, together with several factors affecting the biodiesel yield.