• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회B
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• pp.2558-2561
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• 2008

In the present study, a parallel Taylor-Galerkin/level set based two-phase flow code was developed using finite element discretization and domain decomposition method based on MPI (Message Passing Interface). The proposed method can be utilized for the analysis of a large scale free surface problem in a complex geometry due to the feature of FEM and domain decomposition method. Four-step fractional step method was used for the solution of the incompressible Navier-Stokes equations and Taylor-Galerkin method was adopted for the discretization of hyperbolic type redistancing and advection equations. A Parallel ILU(0) type preconditioner was chosen to accelerate the convergence of a conjugate gradient type iterative solvers. From the present parallel numerical experiments, it has been shown that the proposed method is applicable to the simulation of large scale free surface flows.

• 한국해양공학회지
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• 제11권3호
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• pp.8-19
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• 1997

In this study an adequate type of offshore structure at the Sakhalin region as cold region is proposed and its structural design results are presented based on the reliability analysis. Structural safety assessment has been carried out for the proposed offshore structure at the Sakhalin area as designed by the reliability method. And a rational design procedure is presented based on the reliability analysis. Followings are drawn through the present study : - Four colum TLP structure is proposed as an adequate offshore structure type at the cold region like the Sakhalin region and the reliability-based structural design results are presented. It is seen that the proposed type is a more adequate and economic than the fixed type. - Safety assessment of the proposed structure applying the extended incremental load method is performed. - Referring the allowable safety level for offshore structures it has been found present TLP structure has sufficient structural safety at the system level as well as at the component level.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제14권2호
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• pp.143-172
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• 2010

In this paper, we present an analysis of how students understand some statistical terms, mainly from inferential statistics, which are taught at the high school level. We focus our analysis on those terms that present more difficulties and are persistent in spite of having been studied until the college level. This analysis leads us to a hierarchical classification of responses at different levels of understanding using the SOLO theoretical framework.

• Journal of the korean society of oceanography
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• 제32권4호
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• pp.171-180
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• 1997

Daily mean sea level variability and its response to atmospheric pressure along the coasts of the northwestern Pacific Ocean are investigated. Daily values of sea level and atmospheric pressure covering the period 1976-1986 from 72 stations are analyzed. The sea level and the air pressure in all the data set have a definite seasonal signal, and higher frequency oscillations at time scales of several days to several weeks are also observed. Among the short-period oscillations of sea level with periods shorter than six months, the period of around 3 or 4 months is dominant in most study stations. According to the statistical analysis of sea level and air pressure, the length scale of sea level variability is smaller than that of air pressure for the present study area. The overall variability of sea level is found to be the smallest around Hokkaido, Japan and the largest in the China coasts. Large short-period (< 6 months) sea level variability is found in the southern coasts of China and Hokkaido, and large long-period (> 6 months) variability in the southern coasts of Japan and Korea along Tsushima Current and Kuroshio. The patterns of air pressure are very similar to those of sea level. The air pressure field is found to account for 31% of the overall sea level variability in the study area. Conside.ins the fact that the results (40%) of Pang and Oh (1995) were obtained through monthly sea level, the present result implies that the short-period sea level variability is less affected by air pressure. Generally the sea level response to air pressure are found to be isostatic, but significantly nonisostatic for the periods around 4 months and for those of 2 to 4 days. In particular, nonisostatic response for higher frequencies seem to be due to the restrictions to water transport necessary for barometric responsein the Korea Strait.

• 한국지구과학회지
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• 제36권6호
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• pp.520-532
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• 2015

황해 동부 해안의 홀로세 해수면 변동 특성을 이해하고 시기 별 상승추세를 비교하기 위하여 지질학적 대리기록과 기기관측 자료를 통합하여 분석하였다. 홀로세 동안 황해의 해수면은 초기에 약 10 mm/yr의 속도로 빠르게 상승하고 중기를 거쳐 후기로 갈수록 해수면 상승률은 1 mm/yr 정도로 둔화되며, 20세기 해수면은 홀로세 후기보다 다소 빠르게 상승하였다. 빠른 상승으로 알려진 현재 해수면 상승률은 홀로세 초기와 중기의 상승추세와 비교할 때 사실 훨씬 낮거나 비슷하게 나타난다. 최근 조위계 자료는 황해 해수면이 21세기로 갈수록 상승률이 높아지고 있음을 나타낸다. 이러한 상승 추세는 전 지구적 해수면 변화와 일치한다. 추가적으로, 연구지역에서 현재의 해수면 상승 추세는 이산화탄소 농도와 해수표층온도의 증가율과 대비되며, 이는 인간활동에 수반된 지구온난화의 신호이다. 그러므로 황해 동부와 전세계의 해양에서 관찰되는 현 지구온난화에 의해 야기된 해수면 변화를 '인류세' 해수면 변화라고 제안한다. 이 해수면변화는 조위계와 인공위성 고도계 같은 기기관측을 기반으로 하며, 계측시대를 의미한다. 이와 같이, 황해의 홀로세 해수면 변동은 대리기록으로, '인류세' 해수면은 기기관측을 기반으로 한다.

• 한국지능시스템학회논문지
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• 제17권2호
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• pp.232-237
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• 2007

본 논문에서는 고유벡터법과 평가기준의 관련성 평가에 의한 퍼지종속관계를 이용하여 농협지점의 조직구성원의 업무수준을 결정하는 모델을 제시하고자 한다. 업무수준평가를 위한 평가기준은 두 그룹, 즉 농협에서 이루어지는 업무그룹과 이 업무를 하기 위해 필요로 하는 업무요구사항 그룹으로 나뉘어진다. 연구방법으로서는 업무그룹에 대한 가중치, 이행정도 및 신뢰도, 업무요구사항에 대한 항목별 가중치, 이행정도, 신뢰도, 업무그룹과 업무요구사항간의 관련성을 이용하여 현재의 농협지점의 조직구성원의 업무수준을 평가하므로서 농협지점 전체의 업무수준을 평가할 수 있도록 하였다. 이것은 각 지점의 업무수준을 동일하게 보고 각 지점을 평가하여 순위를 내고 있는 현재의 평가방법에 개선의 여지가 있음을 보여주는 것으로서 농협 및 이와 유사한 업체의 조직구성원, 부서 및 지점의 평가시 많이 활용될 수 있을 것으로 기대된다.

• 한국정보기술응용학회:학술대회논문집
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• 한국정보기술응용학회 2005년도 6th 2005 International Conference on Computers, Communications and System
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• pp.165-168
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• 2005

The objects, which can be personal digital assistants, electronic rings, doors or even clothes, offer embedded chips with computation facilities and are generally called artifacts. I later realized that this was not so the real problem is actually authentication. Recent results indicate scalability problems for flat ad hoc networks. Sensor network achieves function that handle surrounding information perception through sensor and sensed information to network that is consisted of sensor nodes of large number. Research about new access control techniques and height administration techniques need authentication information persons' certification assurance level classification in sensor network environment which become necessary different view base with authentication information at node for application of AAA technology in USN environment that must do authentication process using information that is collected from various sensor mountings. So, get base authentication information in sensor type and present weight grant model by security strength about authentication information through information who draw. In this paper collected information of sensor nodes model who give weight drawing security reinforcement as authentication information by purpose present be going to. and Must be able to can grasp special quality of each sensor appliances in various side and use this and decide authentication assurance level for value estimation as authentication information elements. Therefore, do to define item that can evaluate Authentication information elements thus and give simple authentication assurance level value accordingly because applying weight. Present model who give authentication assurance level value and weight for quotation according to security strength.

• 보존과학연구
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• 통권27호
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• pp.43-61
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• 2006

In this study stone heritages of 533 which is to be investigated through the five years for national treasures and treasures from 2001 to 2005 have been analyzed by statistics for types of stone heritages and rocks, level of alteration in order to make full use of guiding principle in conservation management of stone heritages. The ratio of stone pagoda as a percentage of 34.5% in the stone heritages much higher than others and that is composed of granite(83.0%) in the igneous rock. In the weathering index of surface, a 37.5% of the national treasures were classified with the level 4 and46.3% of the treasure were the level 3 according to state. The present condition of organism distribution take up 30.6% for the level 3 and 22.1% for level 1. In structural stability index, a 40.6%of the national treasures and a 54.2% of treasure were ranked level 3.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2009년도 하계학술발표대회 논문집
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• pp.887-892
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• 2009

Biosafety research facilities require to verified about the facility and experimental environment, especially for level-3 and level-4 of biosafety research facilities verification is very important. In this paper, introduce verified procedures and present the methods and the results through a verified case of the biosafety level-3 research facilities.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2016년도 춘계 종합학술대회 논문집
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• pp.251-252
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• 2016

The vast majority of the disaster prevention design research in Korea has focused on the macro-level interventions such as examining the existing systems and approaches, instituting revised policies, systematically establishing intervention programs, and evaluating the effectiveness of the interventions. However, little has focused on systematically challenging individuals' awareness using micro-level intervention. The present paper introduces approaches to micro-level intervention by infusing narrative-based simulation, and further suggests the implications on balancing the approaches of both micro-level and macro-level interventions.