• 한국농림기상학회지
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• 제6권4호
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• pp.235-241
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• 2004

1월의 최저기온을 대상으로 1951년부터 2000년까지 14개 지점의 관측자료를 분석한 결과 11개 지점에서 전반기(1951-1980)에 비해 후반기(1971-2000)의 연차 변이가 오히려 감소한 것으로 나타났다 표준편차로 표현할 경우 제주, 전주, 울릉도를 제외한 나머지 11개 지점에서 많게는 0.35(서울)에서 적게는 0.03(강릉)까지 고르게 연차변이가 감소하였다. 이는 최근의 난동화 경향과 함께 겨울철 최저기온의 연차변이가 더 심해지고 있다는 당초의 예상과 다른 결과이다 연차변이의 공간분포양상은 최저기온의 절대값과 정의 상관을, 관측점의 해발고도와는 부의 상관을 보였다. 이 관계를 이용하여 남한전역의 1월 최저기온 30년 표준 편차 분포도를 작성하였으며, 이를 토대로 재현기간별로 기대되는 전국의 극최저기온 분포도를 제작하여 지역별 동해위험 평가에 이용토록 하였다.

• 정보보호학회논문지
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• 제18권2호
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• pp.65-73
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• 2008

Cdma2000 1x EV-DO 에서의 보안 계층은 현재 3GPP2를 통해 표준화 규격(C.S0024-A v2.0)을 완성해 나가고 있는 중이며, 이에 따라 cdma2000 1x EV-DO 환경의 AT와 AN 간 전송되는 데이터에 대한 보안 기능을 적용하기 위하여 표준 문서에 명시된 보안 계층 구현요구에 맞는 하드웨어 보안 장치가 요구되고 있다. 본 논문에서는 FPGA 플랫폼을 통해 EV-DO 시큐리티 계층 프로토콜을 시뮬레이션 하여 EV-DO 시큐리티 지원 하드웨어 장치를 설계하였으며, 패킷 데이터에 대한 인증 및 서비스를 위하여 SHA-1 해쉬 알고리즘과 데이터 암호화를 위한 AES, SEED, ARIA 알고리즘을 탑재했으며, 키교환 프로토콜을 이용한 키 교환을 수행 한 후 데이터에 대한 인증 및 암호화 기능을 선택적으로 적용한 하드웨어를 구현하였다.

• 대기
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• 제31권2호
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• pp.143-156
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• 2021

This study investigates the impacts of land cover change due to urbanization on the Urban Heat Island Intensity (UHII) and the Heat Index (HI) over the Seoul metropolitan area using the Unified Model (UM) with the Met Office Reading Urban Surface Exchange Scheme (MORUSES) during the heat wave from 16, July to 5, August 2018. Two simulations are performed with the late 1980s land-use (EXP1980) and the late 2000s land-use (EXP2000). EXP2000 is verified using Automatic Weather Station (AWS) data from 85 points in the study area, and observation sites are classified into two categories according to the urban fraction change over 20 years; Category A is 0.2 or less increase, and Category B is 0.2 or more increase. The 1.5-m temperature and relative humidity in Category B increase by up to 1.1℃ and decreased by 7% at 1900 LST and 2000 LST, respectively. This means that the effect of the urban fraction changes is higher at night. UHII increases by up to 0.3℃ in Category A and 1.3℃ in Category B at 1900 LST. Analysis of the surface energy balance shows that the heat store for a short time during the daytime and release at nighttime with upward sensible heat flux. As a result of the HI, there is no significant difference between the two experiments during the daytime, but it increases 1.6℃ in category B during the nighttime (2200 LST). The results indicate that the urbanization increase both UHII, and HI, but the times of maximum difference between EXP1980 and EXP2000 are different.

• 한국산학기술학회논문지
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• 제13권11호
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• pp.5261-5270
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• 2012

이 연구의 목적은 우리나라의 악성신생물 중 최근 증가율이 가장 높은 대장암에 대하여 우리나라와 OECD 국가들 간에 2000년 전(1990-1999)과 2000년 후(2000-2009)의 사망률과 잠재수명손실연수(PYLL)에 통계학적으로 차이가 있는가를 살펴본 후, 대장암에 대한 국가 간 비교와 변화의 추이를 파악하여, 보건정책, 보건교육 등을 위한 자료를 제공하고자 하였다. "OECD Health Data 2012"을 사용하여 OECD 회원국 중 자료가 불충분한 2개국을 제외한 32개국에 대하여 대응표본 T검정(Paired T test) 방법을 사용해서 2000년 전과 2000년 후에 통계학적으로 차이를 살펴보았다. 남자의 대장암 사망률은 우리나라를 포함한 8개국만 2000년 후에 증가하였고, 여자의 대장암 사망률은 우리나라와 칠레만 증가하였는데 증가폭은 남녀 모두 우리나라가 월등히 높았다. 대장암 잠재수명손실연수는 2000년후에 증가폭이 우리나라가 월등히 높았는데, 남성의 경우 증가율 2위인 멕시코보다 3배 이상 증가하였고, 여성의 경우 2000년 후에 통계학적으로 유의하게 잠재수명손실연수가 증가한 나라는 우리나라가 유일하였다. 따라서, 대부분 OECD 국가는 2000년 이후 대장암 관리가 적절히 통제되고 있는 반면, 우리나라는 그렇지 못한 것으로 보이며, 특히 향후관리에 있어 여성에서 보인 잠재수명손실연수의 증가 이유에 관한 후속연구가 필요해 보인다.

• Structural Engineering and Mechanics
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• 제9권3호
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• pp.215-226
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• 2000

Computational procedure within the framework of return mapping technique has been presented to integrate the constitutive behavior of a concrete model. Developed by Ohtani and Chen, this concrete model is based on multiple hardening concept, and is rate-independent and associative. Consistent tangent operator suitable for finite element analysis is derived to preserve the rate of convergence. Accuracy of the integration technique is verified and compared with available experimental data. Computational efficiency is demonstrated by comparing with results based on elasto-plastic tangent.

• 한국농촌건축학회논문집
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• 제6권1호
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• pp.1-12
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• 2004

This study is for figuring out the relationship between the transition of the religious outlook and the design of worship space in Korean churches after the year of 2000. Analyzing the design samples of worship spaces which are appeared in architectural and interior design publications, it is found out that the modernity in architectural and interior design is presented in many worship spaces. And the progressive effort for the renewal of the worship service is projected to composition of the pulpit and others. But the conservatism of the Korean church has not been eliminated yet. These phenomena are considered to be same in the most cases of rural community church.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 추계종합학술대회 논문집(1)
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• pp.201-204
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• 2000

In this paper, a wireless engineering field tool based on WCDMA is designed and implemented. Emerging requirements for higher rate data service and better spectrum efficiency are identified for the third generation mobile radio systems. The proposed WCDMA field tool is used for improving the quality of WCDMA service. The current position and time are measured and recorded with CDMA field data. With the system a user can observe the spatial distribution of the field data. For providing concurrency, the system is decomposed of four units and each unit is implemented by using threads.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2006년도 춘계학술발표대회
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• pp.693-696
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• 2006

One of the most significant characteristics of JPEG 2000, the emerging still image standards, is the Region of Interest(ROI) coding. Until now, there have been many proposed ROI methods. However, all of these methods can not be applied completely in applications. In this paper, the ROI coding mechanisms in JPEG2000 is first outlined and the diversity of ROI coding methods is discussed in detail. Then a comparative selection about using a proper ROI method according to ROI applications' requirements is proposed. Finally the experimental results show that there are also several parameters that control the effectiveness of ROI coding, such as the codeblock size, ROI size, wavelet filter type, the number of wavelet decomposition levels, and ROI importance score.

• 한국실내디자인학회:학술대회논문집
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• 한국실내디자인학회 2003년도 춘계학술발표대회 논문집
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• pp.144-149
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• 2003

This study is for figuring out the relationship between the theological trend and the design of worship space in Korean churches after the you of 2000. Analyzing the design samples of worship spaces which are appeared in architectural and interior design publications, it is found out that the modernity in architectural and interior design is presented in many worship spaces. And the progressive effort for the renewal of the worship service is projected to composition of the pulpit and others. But the conservatism of the Korean church has not been eliminated yet.

• Structural Engineering and Mechanics
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• 제64권1호
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• pp.23-31
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• 2017

In the study, dynamic behavior of laminated orthotropic beams on elastic foundation is investigated. Consistent model presented here combines the finite element solution of the system with SAP2000 software and the calculation of soil parameters with MATLAB software using Modified Vlasov Model type elastic foundation. For this purpose, a computing tool is coded in MATLAB which employs Open Application Programming Interface (OAPI) feature of SAP2000 to provide two-way data flow during execution. Firstly, an example is taken from the literature to demonstrate the accuracy of the consistent FEM-Vlasov Model. Subsequently, the effects of boundary conditions, subsoil depth, elasticity modulus of subsoil, slenderness ratio, velocity of moving load and lamination scheme on the behavior of laminated orthotropic beams on elastic foundation are investigated on a new numerical example. It can be concluded that it is really convenient to use OAPI feature of SAP2000 to model this complex behavior of laminated orthotropic beams on elastic foundation under moving load.