• 한국조경학회지
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• 제27권2호
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• pp.69-79
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• 1999

This study identifies the features of landscape elements on the fifteen districts with the idea of land use area and visual quantity of pictures by analyzing the air photo. Therefore, the sensibility of observer is comprehended through simulating the landscape evaluation and the landscape preference with using slide film. The study is divided into three periods to understand the transition of rural landscape as the social and cultural environments have been changed. The first period is the New Community Movement which affected the rapid change of social and cultural environments. The second and third periods are the prior and post time at the rearrangement of administration district in the Tae-Jeon Broad City. The result of this study is explained below part; 1. The transition of rural landscape has been occurred as the land use pattern has been altered. The change of pattern has affected an increase of the natural space and the structure change of agricultural productive space. 2. In the regression analysis, the regression model of landscape preference and land use ratio show; Landscape preference = 3.632 - 11.618 (Residential Area) - 4.227 (Equipped Farm). The explanation variables defined as Residential Area and Equipped Farm, and the relationship of those factors shows negative. Therefore, the increase of other building will make the rural landscape lower and worse.

• 수산경영론집
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• 제43권1호
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• pp.19-34
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• 2012

The purpose of the paper is to find out the trade patten and characteristics of Korea's fisheries products by figuring out the factors of affecting the volume of the export of Korean frozen fisheries products based on the data of frozen fisheries (HS0303), which make up of the large volume of Korea's fisheries export using gravity model. The paper has performed regression analysis through using 624 panel data and the statistical program, STATA 12.0. In this study, we can get two results as follows: First, the total import volume of fisheries and transportation distance of trade partners have an influence on the Korea's trade of frozen fisheries products. The time and fare of transportation have also an influence on the Korea's trade of frozen fisheries products. Second, Korea's trade of frozen fisheries products is also affected by the exchange rate of currencies and settlement of FTA which could be shown as important factors in the estimation of export function of general products.

• 한국해양공학회지
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• 제16권4호
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• pp.7-12
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• 2002

This study is aimed to find the scouring mechanism at the toe of rubble mound structures. To investigate the characteristics of scouring in front of the structure, experiments were performed with regular waves in a 2-D flume. The results of this study are as follows. 1) It can be said the characteristics of incident wave causes rolling and sliding of armour block. The difference of wave pressure on the slope, internal flow as well as settlement of armour block due to the weight cause scouring. 2) It is observed that scouring depth at the toe increased when wave height or period increased. The location of ultimate scouring and deposition depth moved seaward when wave period increased. 3) The failure of rubble mound structure was caused by waves or scouring. Failure by erosion increased with high waves and long waves. 4) Using surf-similarity parameter including characteristics of incident waves and structure, scouring and deposition pattern were found and their limit was formulated.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2001년도 봄 학술발표회 논문집
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• pp.299-306
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• 2001

Crushed Stone Pile(CSP) is one of the ground improvement methods available to loose sand and clayey ground by forming compacted CSP in the weak soil layer. The effects of this method are enhancement of ground bearing capacity, reduction of settlement and prevention of lateral ground movement in cohesive layer, reduction of liquefaction potential in sandy ground. This study performs model tests in 1.0m${\times}$1.0m${\times}$1.0m and 1.5m${\times}$1.5m${\times}$l.2m model tank to observe bearing capacity of CSP treated ground. The area replacement ratio of CSP composite ground varies 20%, 30% and 40% with square grid pattern. After the composite ground was consolidated under pressure of 0.5kg/$\textrm{cm}^2$ and 1.0kg/$\textrm{cm}^2$, load tests were carried out. The results show that ultimate bearing capacity increases with area replacement ratio and the preconsolidation pressure of ground.

• 한국농공학회논문집
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• 제56권2호
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• pp.59-64
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• 2014

In this study, the large scale test was performed to investigate the behavior of failure for the embankment and spillway transitional zone by overtopping. The pore water pressure, earth pressure, settlement and failure pattern of covering embankment with geotextile were compared and analyzed. The pore water pressure showed a small change in the spillway transition zone and core, indicating that the geotextile efficiently reinforced the embankment. The earth pressure decreased the infiltration of the pore water only in inclined cores type to secure local stability. The behavior of failure started from the bottom and gradually progressed upwards. After the intermediate overtopping period (100 min), width and depth of the seepage erosion were very small due to the effect of geotextile which delayed failure. Therefore, the reinforced method by geotxtile was a very effective method to respond to the emergency due to overtopping.

• 한국한의학연구원논문집
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• 제15권2호
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• pp.33-37
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• 2009

Objectives : The authors performed this study to further understand Saam acupuncture method in an aspect of formation process. Methods : We were finding Saam's idea in a preface of the book. And we analyzed Saam acupuncture patterns to understand their formation. Results & Conclusion : We assume that Saam acupuncture patterns has formed over time. We were able to split their patters into three phases. That is Primitive-phase, Basic-phase and Practical-phase. We think they are traces of Formation Process. In the first, Saam found DongHaeng-acupoints that have in common Five Element between the five viscera and acupoint. And then, he compounded other meridian's DongHeng-acupoints to control self meridian. Finally acupoints of self meridian were added.

• 한국양식학회지
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• 제10권4호
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• pp.387-394
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• 1997

A total of 353 farmed rockfish, Sebastes schlegli Hilgendorf, 1880 were sampled from 3 localities on Korean coastline over a 12 month period. Full parasitological examination revealed the polypisthocotylean monogenean Micorcotyle sebastis Goto, 1894 to be abundant with infections consistently reaching over 90~100% prevalence throughout the year. A seasonal pattern in parasite abundance on the gills is evident, with the population peaking twice, the largest in winter and again in summer. While the parasitic load on the left and right gills was not dissimilar, parasites within the gill sets were found to favour settlement of the II and III gill arches. A comparison of parasite abundance with host length, revealed that the smaller length fish classes (<17cm standard body length) had significantly heavier infections than those of larger fish (>17 cm standard body length). This report represents the fist record of Microcotyle sebastis on farmed rockfish in Korean coastal waters.

• 헤리티지:역사와 과학
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• 제56권3호
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• pp.22-44
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• 2023

청동기시대 전기 생계경제는 문화유형, 환경적 요인 등에 의해 발현될 수 있는 생산방식의 다양성이 충분히 고려되지 않은 채, 농경 수행의 강도를 설명하는데 초점을 맞추어왔다. 이러한 상황은 신석기-청동기시대 이행을 얼마나 단절적으로 또는 연속적으로 이해할 것인가의 문제를 진지하게 고민하지 않는 데서 비롯된 것으로 보인다. 이러한 인식은 생계자원 생산방식의 점진적인 변화를 탐색할 수 있는 경로를 차단해 왔다. 본고에서는 청동기시대 생계자원의 생산방식이 연속·점진적으로 변화되었다는 것을 전제로 하면서, 청동기시대 전기 생산방식에 영향을 주었을 다양한 요소에 따른 생산자원 생산양상을 복원해보고자 하였다. 청동기시대 전기는 문화유형과 생태적소가 다양하게 확인되는바, 특정 시기의 생계자원 생산방식을 복원하는 작업은 단편적인 한두 가지 분석으로는 달성되기가 어렵다. 따라서 생계자원 생산과 관련된 몇 가지 측면을 분리하여 분석·해석하고 종국에는 모두를 종합하는 것이 적절한 방법적 경로가 될 듯하다. 구체적인 연구 방법으로 생계자원 생산과 밀접한 연관을 지니는 문화·환경적 요소-문화유형, 지리·지형적 요소, 토양생산성, 취락규모-에 따라 기능상 분류된 석제 생산도구 구성에 차이가 있는지를 확인하였다. 분석 결과 서울·경기 지역의 청동기시대 전기 생계자원 생산양상에 있어 문화유형과 지리·지형적 입지에 따른 유의미한 차이는 관찰되지 않는 반면, 취락규모와 토양생산성에 따른 생산도구 구성의 차이에서는 통계적으로도 제법 유의한 결과가 도출되었다. 취락규모와 종합생산토양 비율이 증가할수록 수렵·무구, 목가공구, 수확구가 증가하는 반면 어로구의 비율에 있어서는 그 반대의 양상이 관찰되었다. 취락규모나 작물재배의 생산성에 따른 수렵 혹은 농경에 대한 의존도 사이에 상관관계를 기대하게 하나, 취락규모와 토양생산성 비율 간의 회귀분석 결과에서는 상호 유의미한 관계로 해석되지 않았다. 즉, 이는 여러 요인에 따라 생산양상도 상이하며, 어느 단편적인 요소가 특정 취락의 생계자원의 생산방식을 채택하는데 결정적이지 않았다는 것을 보여주는 결과라고 할 수 있다. 따라서 청동기시대 전기 사회에서의 취락을 구성하는 다양한 문화·환경적 요소에 따라 생계자원 생산양상 검토가 필요하다.

• Journal of Ecology and Environment
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• 제35권1호
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• pp.27-34
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• 2012

Typha angustifolia has ecological characteristics of clonal growth similar to Phragmites australis. The plant spreads byclonal growth and seed dispersal. In this study, for the three stands which have different settlement age at the Baksilji wetland in Korea, genetic diversity was estimated by random amplification of polymorphic DNA analysis to evaluate the change in genetic diversity of T. angustifolia during stand development in the same population. Stand (ST) 1 was the oldest and ST 4 was the youngest. ST 5 was in a small ditch out of the Baksilji. Although the ST 1, ST 2, and ST 3 did not differ significantly in vegetational or physical environment, the genetic diversity estimated according to Nei's gene diversity (h) and the Shannon index (i) increased in the order of ST 1 < ST 2 < ST 3 contrary to formative age. The genetic diversity of ST 4 was much higher than that of the other three stands. ST 4 has similar abiotic environmental conditions with slight T. angustifolia dominance, and seems to be in the early establishment stage. ST 5 differed from the other stands in vegetational and soil environments, which can result in stressful cattail conditions. Even though the ST 5 stand was not younger than the ST 4 stand, ST 5 showed the highest genetic diversity. Our results indicate that after early settlement of the T. angustifolia population, genetic diversity within the species decreased over time and that the decreasing pattern of genetic diversity within T. angustifolia stands is not likely to occur under stressful conditions.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2005년도 춘계 학술발표회 논문집
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• pp.57-64
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• 2005

Since the allowable bearing capacities of piles in weathered/fractured rock are mainly governed by settlement, the load-displacement behavior of the rock socketed pile should be well known. To predict pile head settlement at the design stage, the exact understanding of the load-transfer mechanisms is essential. Therefore, in this research, the load-transfer mechanisms of drilled shaft socketed into weathered rock was investigated. For that, 5 cast-in-place concrete piles with diameters of 1,000 mm were socketed into weathered gneiss. The static axial load tests and the load-transfer measurements were performed to examine the axial resistant behavior of the piles. A comprehensive field/laboratory testing program on weathered rock at the field test sites was also performed to describe the in situ rock mass conditions quantitatively. And then, the effect of rock mass condition on the load transfer mechanism was investigated. The side shear resistance of the pile in moderately weathered rock reached to yielding point at a few millimeter displacements, and after that, the rate of resistance increment dramatically decreased. However, that in the highly /completely weathered rock did not show the obvious yielding point, and gradually increased showing the hyperbolic pattern until with the relatively high displacement (>10 mm). The end bearing-displacement curves showed linear increase at least until with the base displacement of approximately 10 mm, regardless rock mass conditions.