• Journal of Korea Water Resources Association
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• v.34 no.6
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• pp.651-657
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• 2001

The second-order long waves generated by short wave groups propagating over a step are theoretically investigated. The diffraction of short waves is firstly formulated and the governing equations of second-order long waves are then derived by using a multiple-scale perturbation method. It is observed that free and locked long waves are generated and propagated with different velocities.

• The Korean Journal of Rheology
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• v.10 no.3
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• pp.121-130
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• 1998

본 연구에서는 카오스 스크류에 대해 비선형 동력학적 모델을 도입하여 카오스가 일어나는 경로를 밝히고 이를 수치적으로 증명하였다. 배리어가 계속존재하는 경우를 적분 가능계로 정의하고 공간주기적 상공간에서 두 개의 호모클리닉 궤도를 포함하는 원환체를 적분가능계의 모델로 도입하였다. 주기적으로 삽입된 배리어 없는 영역을 교란 으로 취급하 여 해 사상을 도입하여 면적 보존의 포인카레 단면을 정의 하였다. 호모클리닉 궤도가 깨어 져 칸토로 집합을 이룸을 설명했고 내부의 원환체는 공진띠와 KAM띠를 이루며 혼합을 방 해함을 설명했다. 다변유한요소를 이용한 완전 3차원수치해석을 통해 회전수 x/3에 해당하 는 공진띠의 존재를 보이고 교란이 큰 경우에는 거의 모든 영역이 무작위적인 혼합을 보여 주는 카오스 영역으로 바뀜을 보였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2010.05a
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• pp.610-614
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• 2010

지구온난화에 따른 이상기후 현상으로 불확실성에 대한 고려가 더욱 중요해진 지금 설계빈도의 무조건적인 상향조정에 의존하기보다는 추계학적 방법을 도입한 수문량의 확충 및 매개변수의 불확실성을 고려하기 위한 연구가 활발히 진행중이다. 본 연구에서는 강우발생의 불확실성을 반영하여 제내지에서의 침수 범위를 GIS상에서 검토하기 위해 log-ratio 방법, Johnson 시스템, 직교변환을 활용한 다변량 Monte Carlo 기법으로 추계학적 시간에 따른 강우변동을 생성하였다. 생성된 강우변동 결과를 토대로 수문분석, 홍수위 분석 등을 실시하고 FLUMEN 모형을 적용하여 해당유역에 대한 홍수범람시 침수범위를 산정하였다. 본 연구결과는 실제 강우의 불확실성을 반영하고 있어 시 공간적 강우특성이 반영된 유역별 주민대피지도, 홍수위험지도 등을 제작하는데 활용될 수 있을 것으로 기대된다.

• Communications for Statistical Applications and Methods
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• v.15 no.1
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• pp.65-76
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• 2008

Biplots are the multivariate analogue of scatter plots. They approximate the multivariate distribution of a sample in a few dimensions, typically two, and they superimpose on this display representations of the variables on which the samples are measured(Gower and Hand, 1996, Chapter 1). And the relationships between the observations and variables can be easily seen. Thus, biplots are useful for giving a graphical description of the data. However, this method does not give some concise interpretations between variables and observations when the number of observations are large. Therefore, in this study, we will suggest to interpret the biplot analysis by applying the K-means clustering analysis. It shows that the relationships between the clusters and variables can be easily interpreted. So, this method is more useful for giving a graphical description of the data than using raw data.

• 한국지구과학회:학술대회논문집
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• 2005.02a
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• pp.138-144
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• 2005

석류석은 변성 온도와 압력을 계산하는 지온지압계에 널리 사용되며, 또한 이들 내부엽리와 외부엽리와의 접촉 관계를 이용하여 상대적인 변형작용의 시기를 밝히는 데 이용되어져 왔다. 석류석 반상변정 내의 내부 엽리 조직에 대한 정량적인 해석과 내부 미세 구조와 화학적 누대구조와의 관계에 대한 접근 방법은 석류석이 형성되는 동안에 온도-압력-변형작용의 진화 과정을 보다 정량적으로 해석할 수 있을 뿐만 아니라, 절대 연령 자료와 결합은 조산 운동 동안 발생하는 다변성/다변형 작용의 특징 보여주는 온도-압력-변형-시간 경로를 규명할 수 있다. 미국 메사추세츠 주 북중부 지역에서 십자석, 남정석과 함께 산출되는 석류석 반상변정은 온도-압력이 증가(540-570 $^{\circ}C$, 4.0-5.0 kbar에서 620-637 $^{\circ}C$, 7.9-8.8 kbar 까지) 하면서 성장하였다. 또한 이와 같은 변성작용 동안 압축 변형 방향은 다음과 같은 순서로, NE-SW, NW-SE, N-S 그 다음 E-W 방향으로 변화하였다. 결론적으로 이와 같은 변성작용과 변형작용은 주로 고생대 중기 데본기 동안에 일어났던 아카디안 조산운동으로 특징 지워 지며, 후기 알레게니안 조산운동에 부분적으로 영향을 받은 것으로 판단한다.

• Journal of the Korean Geosynthetics Society
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• v.9 no.3
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• pp.39-45
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• 2010

When the ground temperature drops below $0^{\circ}C$, wet soils expand due to the ice formation in their porous space. This results in frost heave which causes structural stability problems. Frost heave is attributed by several factors such as physical soil properties and heat transfer including pore water phase change. Due to the complex physical phenomena, reliable and verified multi-dimensional numerical models for frost heave problems are still in a research stage. This study presents an efficient and simple method of overcoming numerical problems associated with sudden jump of heat capacity due to the phase change from water to ice in the pore space. This paper proposes heat transfer equation and finite element method when the saturated soils or porous rocks are subjected to freezing. Numerical analyses using the proposed method agree well with the known closed form solution and the laboratory test results.

• Current Research on Agriculture and Life Sciences
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• v.7
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• pp.127-151
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• 1989

The ground beetles or carabids are essentially predaceous feeding on a wide variety of insects including forest pests, slugs and land snails containing those injurious to livestock or veterinary, thus many are predominantly beneficial and serve as natural enemies. In the present investigation, some morphometric multivariate analysis were done for 9 different populations in 5 subspecies of D. (C.) jankowskii, which are one of the most common ground beetles in Korea As the results, when the comparison was conducted between intraspecific groups regardless of subspecies in external morphological characters, the average group membership revealed 97.46% correct assignment For intersubspecific comparisons alone 96.3% were correctly classified. Between the groups of ssp. jankowskii an average of 100% individuals were classified in their known group. Thus the predict group membership was highly significant(P<0.001), exceeding so-called 'the 75% rule'. Whereas, the average group membership using the male genitalic characters represented less than the 75% assignment, except only in ssp. quelpartianus (85.6%). The population from Is. Chindo were described here as a new subspecies for qualitative as well as the resultant quantitative differences. Therefore, a total of 7 subspecies are represented in Korea. Among them, the nominate subspecies, ssp. jankowskii(sensu lato), revealed distinct intrasubspecific differences between different geographic populations. These differences can be as notable as intersubspecific variation which need substantial revision of the previous intuitional concepts on the infraspecific level.

• Journal of Korea Game Society
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• v.14 no.5
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• pp.15-24
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• 2014

Semiotics studies the structures and systems of all signs related to human life, thus being capable of analyzing games. "Playing games" can be deemed as an act of reading or interpreting games semiotically, which makes game producers "senders," games "texts," gamers "receivers," and gamers playing games "contexts." Since most games are in the multi-variable narrative format, however, it is not a frequent case that gamers interpret games in the ways intended by producers. This study thus set out to analyze and interpret the console game (2001) remembered as the same evaluation by many gamers in the way intended by the producer. For analysis, the study defined its story program by analyzing the plot and sequence. For semantic analysis, the study applied the Actor Model and the Semiotic Square Model to interpret . The process identified such codes as confrontation, assistance, collaboration, and control and confirmed that Ico and Yorda, non-subject characters, were transforming into subject ones. That is, tells a story of the main characters that used to lead a non-subject life earning lives of their own.

• Journal of the Korean Association of Geographic Information Studies
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• v.6 no.4
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• pp.99-108
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• 2003

In early year 2003, the previous Urban Planning Law and National Land Use Management Law were abolished and integrated into the Law regarding National Land Planning and Land Use Management. Accordingly, previous Urban Planning Information System is reformed into National Land Use Information System. This paper intends to develop indexes supporting decision-making process and to construct theme map using digital map that can be utilized for the National Land Use Information System. As a base for the index development, necessary database(DB) was established by utilizing the socio-economic information of towns and villages in Busan and a layer of public facilities. Based on the DB, multivariate analyses were performed to examine and analyze the spatial structure of Busan. It was then expressed and constructed as a theme map. The facility theme map was also constructed based on a layer of public facilities and the shortest distance between towns and villages.

• Journal of the Korean Association of Geographic Information Studies
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• v.14 no.4
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• pp.92-101
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• 2011

This study analyzed the urban structure of Jinju city where urban doughnut phenomena, development of new town at suburban zone and establishment of innovation city appear. The sphere of this study was set limit to Jinju's dong area due to taking the limitation of data. Multivariate analysis was done by using 24 variables to classify into seven clusters(CBD, Industrial Area, Residential Area etc). We studied regional condition and problems at the relation between analyzed regional features of this study and development principles at the upper planning. Jinju city needs urban redevelopment, reconstruction works and redevelopment promotion project for urban outworn zone in view of the regional conditions to innovate outdated city image and restore western Gyeongnam as a central city and also they should promote innovative city that is progressing now and construction of new town that is linked with Sangpyeong industrial complex removal as well as the whole Chojang-dong zone. In conclusion, this study will help to understand regional phenomenon like regional development project and urban management.