• 한국컴퓨터정보학회논문지
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• 제21권9호
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• pp.85-90
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• 2016

In this paper, we study the domain-independent sensor data structuring method and the derivations about ' Filter Criteria' expansion factors of heterogeneous domain systems. For this purpose, we propose a 5W1H based information search and retrieval method without knowledges about the target domains. And we also suggest a resource management model that can support expanding search of information. By the suggested method, the oneM2M standard able to implement the use-cases like 'data exchanging between the heterogeneous domains'.

• 대한화학회지
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• 제53권1호
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• pp.90-94
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• 2009

• 한국정보과학회논문지:시스템및이론
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• 제31권8호
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• pp.453-464
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• 2004

In order to solve the well-known drawback of reduced flexibility that is associate with ASIC implementations, this paper proposes a novel arithmetic unit over GF(2$^{m}$ ) for field programmable gate arrays (FPGAs) implementations of elliptic curve cryptographic processor. The proposed arithmetic unit is based on the binary extended GCD algorithm and the MSB-first multiplication scheme, and designed as systolic architecture to remove global signals broadcasting. The proposed architecture can perform both division and multiplication in GF(2$^{m}$ ). In other word, when input data come in continuously, it produces division results at a rate of one per m clock cycles after an initial delay of 5m-2 in division mode and multiplication results at a rate of one per m clock cycles after an initial delay of 3m in multiplication mode respectively. Analysis shows that while previously proposed dividers have area complexity of Ο(m$^2$) or Ο(mㆍ(log$_2$$^{m}$ )), the Proposed architecture has area complexity of Ο(m), In addition, the proposed architecture has significantly less computational delay time compared with the divider which has area complexity of Ο(mㆍ(log$_2$$^{m}$ )). FPGA implementation results of the proposed arithmetic unit, in which Altera's EP2A70F1508C-7 was used as the target device, show that it ran at maximum 121MHz and utilized 52% of the chip area in GF(2$^{571}$ ). Therefore, when elliptic curve cryptographic processor is implemented on FPGAs, the proposed arithmetic unit is well suited for both division and multiplication circuit.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 V
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• pp.2633-2636
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• 2003

This study focuses on the new hardware design of fast and low-complexity multiplier over GF(2$\^$m/). The proposed multiplier based on the irreducible all one polynomial (AOP) of degree m, to reduced the system's complexity. It composed of Cyclic Shift, Partial Product, and Modular Summation Blocks. Also it consists of (m＋1)$^2$2-input AND gates and m(m＋1) 2-input XOR gates. Out architecture is very regular, modular and therefore, well-suited for VLSI implementation.

• 한국환경복원기술학회지
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• 제6권4호
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• pp.52-61
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• 2003

This study was carried out to analyze the effects of stormwater retention and infiltration pond on reduction of flood peak and volume in a experimentally developed ecological pond. The experimental site has 542$m^2$ watershed area, 1,310mm yearly-averaged rainfall. And the area of the retention pond is 60$m^2$, the maximum water depth is 0.5m, the maximum and average storage is 15$m^3$and 9.3$m^3$d. And the area of infiltration pond is 58$m^2$, and the water depth varies 0.2m~0.5m. The monitoring system consists of one rainfall gage, one Parshall flume and acoustic water level gage, two rectangular weirs and acoustic water level gage for discharge gaging, and one data recording unit. Data from ten storm events in total, three storm events in year 2000 and seven storm events in year 2001, were collected. From the data the evaporation rate was achieved with the water balance equation, and the result shows 5.0mm/day in average. The result from the analysis of the effects on reduction of flood peak and volume, is that 14% reduction of flood volume and 15% reduction of flood peak in retention pond and 49% reduction of flood volume in infiltration pond.

• Biotechnology and Bioprocess Engineering:BBE
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• 제5권3호
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• pp.215-218
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• 2000

Sialytrisaccharides based on $\beta$-galactosyldisaccharides were synthesized using $\beta$-galactosidase and trans-sialidase in one pot. Using $\beta$-galactosidase from Bacillus Ciculans and trans-sialidase from Trypanosoma cruzi simulaneously, 6mM sialyltrisaccharides composed of about 95% NeuAc$\alpha$(2,3)Gal$\beta$(1,4)GlcNAc and 5% NeuAc$\alpha$(2,3)Gal$\beta$(1,6)GlcNAc were produced from a reaction mixture containing 25mM o-nitropheny1-$\beta$-D-galsctolneuraminic acid. One beauty of this reaction was that a secondary hydrolysis of the disaccharide intermediate occurring between the activated galactopyranoside and N-acetylgucosamine was prevented. Using $\beta$-galactosidase from Escherichia cloi and the same trans-sialidase, 15mM sialyltrisaccharides composed of about 90% NeuAc$\alpha$(2,3)Gal$\beta$(1,6)GlcNac and 10% NeuAc$\alpha$(2,3)Gal$\beta$(1,4)GlcNAc were produced from a reaction misture containing 400nM galactose, 800nM N-acetylglucosylation rection between galactose and N-actylgucosamine was diminant since the disaccharide intermediate mainly resulted sreulted in the silylated product.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제7권3호
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• pp.81-90
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• 2018

IoT(Internet of Things)의 급격한 발달로 인하여 2024년까지 수백억 개의 IoT 디바이스가 만들어질 것으로 예측되고 있으며, 그러한 IoT 디바이스들에 영향을 미칠 수 있는 IoT 플랫폼의 중요성이 부각되고 있다. 현재 FIWARE, oneM2M, AllJoyn 등의 많은 IoT 플랫폼이 개발되고 있지만 이런 환경에서는 각 IoT 플랫폼의 통신 프로토콜, 보안 정책 등이 상이한 이종성(Heterogeneity)으로 인해 데이터를 연동하거나 보안 인터워킹을 수행하기가 어렵다. 보안이 고려되지 않은 인터워킹은 각종 개인, 기업 정보의 유출 등 심각한 문제를 야기할 수 있다. 이러한 문제를 해결하기 위해, 본 논문에서는 IoT 플랫폼 중에서도 대표적인 IoT 플랫폼인 FIWARE와 oneM2M을 대상으로 보안 인터워킹 구조를 제안하고 구현하였다. 본 논문에서는 해당 보안 인터워킹 구조에서 사용하는 FIWARE의 보안 아키텍처를 분석하고 구현하여 시사점을 도출하고, 현재 공식적인 보안 컴포넌트가 존재하지 않는 oneM2M 플랫폼에 OAuth 2.0 기반의 보안 프레임워크를 개발하였다. 또한, 본 논문에서 제안한 방법을 LED(Light-Emitting Diode) 예제로 개발하여 oneM2M 플랫폼과 FIWARE 플랫폼 간의 인증 및 인가 인터워킹을 수행하였다. 구현된 LED 예제는 인가 받은 사용자에게만 제어될 수 있도록 만들어졌으며, 향후에는 LED 이외의 스마트 홈의 CCTV, 도어 락(Door Lock)과 같이 다양한 디바이스 및 다양한 IoT 플랫폼(예를 들어, Watson IoT, IoTivity, AllJoyn 등)에 적용이 필요하다.

• 대한수학회논문집
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• 제10권1호
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• pp.235-249
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• 1995

Let K be a bounded linear operator from Hilbert space $H_1$ into Hilbert space $H_2$. When numerically solving the first kind equation Kf = g, one usually picks n orthonormal functions $\phi_1, \phi_2,...,\phi_n$ in $H_1$ which depend on the numerical method and on the problem, see Varah [12] for more details. Then one findes the unique minimum norm element $f_M \in M$ that satisfies $\Vert K f_M - g \Vert = inf {\Vert K f - g \Vert : f \in M}$, where M is the linear span of $\phi_1, \phi_2,...,\phi_n$. Such a solution $f_M \in M$ is called the M-solution of K f = g. Some methods for finding the M-solution of K f = g were proposed by Banks [2] and Marti [9,10]. See [5,6,8] for convergence results comparing the M-solution of K f = g with $f_0$, the least squares solution of minimum norm (LSSMN) of K f = g.

• 호남수학학술지
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• 제40권2호
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• pp.211-218
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• 2018

Let R be a commutative Noetherian ring, a be an ideal of R and M be an R-module. It is shown that if $Ext^i_R(R/a,M)$ is minimax for all $i{\leq}{\dim}\;M$, then the R-module $Ext^i_R(N,M)$ is minimax for all $i{\geq}0$ and for any finitely generated R-module N with $Supp_R(N){\subseteq}V(a)$ and dim $N{\leq}1$. As a consequence of this result we obtain that for any a-torsion R-module M that $Ext^i_R(R/a,M)$ is minimax for all $i{\leq}dim$ M, all Bass numbers and all Betti numbers of M are finite. This generalizes [8, Corollary 2.7]. Also, some equivalent conditions for the cominimaxness of local cohomology modules with respect to ideals of dimension at most one are given.

• 한국토양환경학회지
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• 제3권1호
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• pp.83-92
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• 1998

본 연구는 가스 포집관을 설치한 쓰레기 매립지에서의 가스 유동에 따른 모델 해석으로 부터 다음의 결과를 얻었다. 1) 저항이 없는 유량 계측기의 오차는, 투기계수 $10^{-14}$ $m^{2}$(실트; 포화투수계수 $10^{-7}$ m/s)보다 작은 복토를 쓰고 가스 발생량을 계측한다면, \circled1 직경 l0m 내에서는 0.5 mL/s 이상, \circled2 직경 20m 내에서는 2mL/s 이상, \circled3 직경 50m 내에서는 10 mL/s 이상의 유량범위에서, 정확한 계측치를 얻을 수 있다. 2)복토층의 \circled1투기계수가 $10^{-16}$$m^{2}$(점토; 포화투수계수 $10^{-9}$( m/s)에서는, 3종(bubblemeter, water head indicator and rotor meter)의 유량 계측기 모두 50m까지 유효한 계측이 가능하다. \circled2투기계수가 1$10^{-14}$$m^{2}$에서는, bubble meter and water head indicator는 5m 이하, rotor meter는 15m 내의 범위에서 유효한 계측이 가능하다. \circled3투기계수가 $10^{12}$$m^{2}$에서는 가스 포집관의 2m범위 이내에서만 유효히 계측된다. 3) 가스 포집관에 유량 계측기를 설치하면, 계측조건의 변화로 정상조건까지의 도달시간은 bubble meter와 water head indicator는 약 1일, roter meter는 약 1시간 정도가 소요된다.