• Asian Journal of Atmospheric Environment
• /
• 제2권1호
• /
• pp.34-46
• /
• 2008

Emissions inputs for use in air quality modeling of Korea were generated with the emissions inventory data from the National Institute of Environmental Research (NIER), maintained under the Clean Air Policy Support System (CAPSS) database. Source Classification Codes (SCC) in the Korea emissions inventory were adapted to use with the U.S. EPA's Sparse Matrix Operator Kernel Emissions (SMOKE) by finding the best-matching SMOKE default SCCs for the chemical speciation and temporal allocation. A set of 19 surrogate spatial allocation factors for South Korea were developed utilizing the Multi-scale Integrated Modeling System (MIMS) Spatial Allocator and Korean GIS databases. The mobile and area source emissions data, after temporal allocation, show typical sinusoidal diurnal variations with high peaks during daytime, while point source emissions show weak diurnal variations. The model-ready emissions are speciated for the carbon bond version 4 (CB-4) chemical mechanism. Volatile organic carbon (VOC) emissions from painting related industries in area source category significantly contribute to TOL (Toluene) and XYL (Xylene) emissions. ETH (Ethylene) emissions are largely contributed from point industrial incineration facilities and various mobile sources. On the other hand, a large portion of OLE (Olefin) emissions are speciated from mobile sources in addition to those contributed by the polypropylene industry in point source. It was found that FORM (Formaldehyde) is mostly emitted from petroleum industry and heavy duty diesel vehicles. Chemical speciation of PM2.5 emissions shows that PEC (primary fine elemental carbon) and POA (primary fine organic aerosol) are the most abundant species from diesel and gasoline vehicles. To reduce uncertainties in processing the Korea emission inventory due to the mapping of Korean SCCs to those of U.S., it would be practical to develop and use domestic source profiles for the top 10 SCCs for area and point sources and top 5 SCCs for on-road mobile sources when VOC emissions from the sources are more than 90% of the total.

• Structural Engineering and Mechanics
• /
• 제57권2호
• /
• pp.327-355
• /
• 2016

A new analytical derivation of the elastodynamic point load solutions for an isotropic multi-layered half-space is presented by means of the precise integration method (PIM) and the approach of dual vector. The time-harmonic external load is prescribed either on the external boundary or in the interior of the solid medium. Starting with the axisymmetric governing motion equations in a cylindrical coordinate system, a second order ordinary differential matrix equation can be gained by making use of the Hankel integral transform. Employing the technique of dual vector, the second order ordinary differential matrix equation can be simplified into a first-order one. The approach of PIM is implemented to obtain the solutions of the ordinary differential matrix equation in the Hankel integral transform domain. The PIM is a highly accurate algorithm to solve sets of first-order ordinary differential equations and any desired accuracy of the dynamic point load solutions can be achieved. The numerical simulation is based on algebraic matrix operation. As a result, the computational effort is reduced to a great extent and the computation is unconditionally stable. Selected numerical trials are given to validate the accuracy and applicability of the proposed approach. More examples are discussed to portray the dependence of the load-displacement response on the isotropic parameters of the multi-layered media, the depth of external load and the frequency of excitation.

• 대한기계학회논문집B
• /
• 제34권10호
• /
• pp.947-955
• /
• 2010

대부분의 석유 가스전은 탄화수소혼합물과 일반기체 등 저류층 내부 유체의 성분조성에 따라 저류층내 상거동 특성이 매우 민감하게 변화한다. 석유 가스전의 평가와 개발 생산계획을 수립함에 있어, 이러한 상거동에 따른 기체와 액체의 성분비 결정과 석유와 가스의 이상유동 해석을 위한 저류유체의 PVT관계 및 포화물성의 규명은 필수적이다. 이중에서 특히, 포화물성의 계산은 수렴성이 나빠, 이상 유동의 해석적 연구에 있어서 많은 어려움을 초래하는 원인이 되고 있다. 이에 본 연구에서는 포화물성 의 계산에 있어서 수렴도 향상을 위한 새로운 초기값 추정 방법과 근 탐색 알고리듬을 제안하고, 성능비교 등을 통한 수렴도 영향인자에 대한 분석을 시도하였다. 결과적으로, 제안된 방법을 통해 포화물성 해석 수렴성을 개선하였고 GUI 기반의 새로운 다성분 다상거동해석 시뮬레이터의 개발에 적용하였다.

• 한국정보통신학회논문지
• /
• 제12권12호
• /
• pp.2140-2145
• /
• 2008

UWB 초고속 무선통신 시스템을 위한 MB-OFDM용 128-포인트 FFT 프로세서를 설계하였다. 128-포인트 FFT 프로세서는 Radix-2 FFT 알고리듬과 R2SDF 파이프라인 구조에 기초하고 있으며, VHDL을 이용하여 구현되었다. 그 결과는 Modelsim을 이용하여 검증되었으며, Xilinx Vertex-II FPGA를 이용하여 합성된 결과 18.7MHz의 동작주파수를 얻을 수 있었다. 제안된 128-포인트 FFT 프로세서는 병렬처리 되는 FFT 프로세서의 한 블록으로 이용될 수 있으며, 이를 이용하여 고속의 병렬처리 FFT 모듈이 구현될 수 있게 된다. 따라서 본 논문은 4개의 128-포인트 FFT 프로세서를 병렬로 연결하여 4배의 동작주파수를 얻을 수 있었으며, 결과적으로 MB-OFDM에서 요구되는 동작주파수 이상의 성능을 얻게 되었다.

• 한국양봉학회지
• /
• 제34권1호
• /
• pp.39-46
• /
• 2019

BQCV multi-point PCR was developed as a rapid multiplex detection method for BQCV, one of the viral pathogens of honeybees. It could detect BQCV specific genes qualitative as well as quantitative detection based on ultra-rapid PCR. Three primer pairs (RNA dependent RNA polymerase, capsid protein, 3C like protease) were specifically designed for accurate the detection and were optimized for minimizing the detection time and increasing the sensitivity. Our advanced diagnostic system have the accuracy by lowering the concern about the variation in the BQCV detection site. In addition, it should be an opportunity to identify mutations that are mixed with other viruses.

• 대한수학회지
• /
• 제57권2호
• /
• pp.429-450
• /
• 2020

We prove that wave operators for Schrödinger operators with multi-center local point interactions are scaling limits of the ones for Schrödinger operators with regular potentials. We simultaneously present a proof of the corresponding well known result for the resolvent which substantially simplifies the one by Albeverio et al.

• Journal of applied mathematics & informatics
• /
• 제28권5_6호
• /
• pp.1445-1460
• /
• 2010

In this paper, a second-order system of multi-point boundary value problems in Banach spaces is investigated. Based on a specially constructed cone and the fixed point theorem of strict-set-contraction operators, the criterion of the existence and multiplicity of positive solutions are established. And two examples demonstrating the theoretic results are given.

• 한국수학교육학회지시리즈B:순수및응용수학
• /
• 제31권1호
• /
• pp.21-32
• /
• 2024

In this paper, we introduce new types of weakly Picard operators being available to a much wider class of maps, and prove common fixed point theorems of Subrahmanyam type for two these weakly Picard operators in the collection of single-valued and multi-valued mappings in complete metric spaces. Our results extend and generalize the corresponding fixed point theorems in the literature [3, 6].

• Nonlinear Functional Analysis and Applications
• /
• 제29권1호
• /
• pp.113-130
• /
• 2024

In this work, we explore the existence and uniqueness results for a class of boundary value issues for implicit Volterra-Fredholm nonlinear integro-differential equations (IDEs) with Atangana-Baleanu-Riemann fractional (ABR-fractional) that have non-instantaneous multi-point fractional boundary conditions. The findings are supported by Krasnoselskii's fixed point theorem, Gronwall-Bellman inequality, and the Banach contraction principle. Finally, a demonstrative example is provided to support our key findings.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2004년도 학술대회 논문집 정보 및 제어부문
• /
• pp.129-131
• /
• 2004

Elliptic Curve Cryptography (ECC) coprocessors support massive scalar multiplications of a point. We research the design for multi-segment multipliers in fixed-size ECC coprocessors using the multi-segment Karatsuba algorithm on GF($2^m$). ECC coprocessors of the proposed multiplier is verified on the SoC-design verification kit which embeds ALTERA EXCALIBUR FPGAs. As a result of our experiment, the multi-segment Karatsuba multiplier, which has more efficient performance about twice times than the traditional multi-segment multiplier, can be implemented as adding few H/W resources. Therefore the multi-segment Karatsuba multiplier which satisfies performance for the cryptographic algorithm, is adequate for a low cost embedded system, and is implemented in the minimum area.