• 제목/요약/키워드: prime process

검색결과 243건 처리시간 0.023초

RINGS WHOSE PRIME RADICALS ARE COMPLETELY PRIME

  • KANG, KWANG-HO;KIM, BYUNG-OK;NAM, SANG-JIG;SOHN, SU-HO
    • 대한수학회논문집
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    • 제20권3호
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    • pp.457-466
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    • 2005
  • We study in this note rings whose prime radicals are completely prime. We obtain equivalent conditions to the complete 2-primal-ness and observe properties of completely 2-primal rings, finding examples and counterexamples to the situations that occur naturally in the process.

소수 코드를 이용한 블록 암호화 알고리즘 (A BLOCK CRYPTOGRAPHIC ALGORITHM BASED ON A PRIME CODE)

  • 송문빈;오재곤;정연모
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2000년도 추계종합학술대회 논문집(2)
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    • pp.136-139
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    • 2000
  • In this paper, we propose a prime code and a new cryptographic algorithm for encryption and decryption as its application. The characteristics of prime numbers with irregular distribution and uniqueness are used to generate the prime code. Based on the prime code, an encryption algorithm for secret key is presented. Since the algorithm requires simpler operations than existing encryption such as DES, the burden for hardware implementation of the encryption and decryption process is alleviated.

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PRIME RADICALS OF FORMAL POWER SERIES RINGS

  • Huh, Chan;Kim, Hong-Kee;Lee, Dong-Su;Lee, Yang
    • 대한수학회보
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    • 제38권4호
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    • pp.623-633
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    • 2001
  • In this note we study the prime radicals of formal power series rings, and the shapes of them under the condition that the prime radical is nilpotent. Furthermore we observe the condition structurally, adding related examples to the situations that occur naturally in the process.

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Determination of energy resolution for a NaI(Tl) detector modeled with FLUKA code

  • Demir, Nilgun;Kuluozturk, Zehra Nur
    • Nuclear Engineering and Technology
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    • 제53권11호
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    • pp.3759-3763
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    • 2021
  • In this study, 3" × 3" NaI(Tl) detector, which is widely used in gamma spectroscopy, was modeled with FLUKA code, and calculations required to determine the detector's energy resolution were reported. Photon beams with isotropic distribution with 59, 81, 302, 356, 511, 662, 835, 1173, 1275, and 1332 keV energy were used as radiation sources. The photon pulse height distribution of the NaI(Tl) without influence of its energy resolution obtained with FLUKA code has been converted into a real NaI(Tl) response function, using the necessary conversion process. The photon pulse height distribution simulated in the conversion process was analyzed using the ROOT data analysis framework. The statistical errors of the simulated data were found in the range of 0.2-1.1%. When the results, obtained with FLUKA and ROOT, are compared with the literature data, it is seen that the results are in good agreement with them. Thus, the applicability of this procedure has been demonstrated for the other energy values mentioned.

동적 XML 문서에서 효과적인 레이블링을 위해 형제순서 값을 갖는 프라임 넘버링 기법 (A Prime Numbering Scheme with Sibling-Order Value for Efficient Labeling in Dynamic XML Documents)

  • 이강우;이준동
    • 한국컴퓨터정보학회논문지
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    • 제12권5호
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    • pp.65-72
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    • 2007
  • 동적인 XML 문서에서 빈번히 발생하는 갱신에 대한 고려를 하지 않는 레이블링 기법들은 XML 문서 트리의 갱신이 일어날 때 마다 변화된 레이블 정보를 반영하기 위해서 전체 XML 트리를 재탐색하여 전체 노드의 레이블을 다시 계산하는 리레이블링(relabeling)과정이 필요하다. 이러한 리레이블링은 갱신이 빈번히 일어나는 동적인 XML 문서에서는 비용이 상당히 크다는 단점이 있다. 이런 단점을 해결하기 위해 리레이블링 과정이 필요 없는 레이블링 기법으로 프라임 넘버 레이블링 기법(prime number labeling scheme)이 제안되었다. 그러나 프라임 넘버 레이블링 기법은 문서가 갱신될 때 XML 문서 트리의 노드 간 형제순서(sibling order)를 갱신하는 문제는 고려하지 않고 있다. 이러한 형제순서의 갱신과정은 XML 문서 트리의 많은 부분을 재탐색하고 재기록 하여야 하므로 많은 비용이 필요하게 된다. 따라서 본 논문에서는 XML 문서 트리의 재탐색과 재기록이 필요 없이 형제순서를 유지할 수 있는 형제순서 값을 갖는 프라임 넘버 레이블링 기법을 제안한다.

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DRM 수신기의 효율적인 수신을 위한 가변 프라임펙터 FFT 설계 (Design Method of Variable Point Prime Factor FFT For DRM Receiver)

  • 김현식;이연성;서정욱;백종호
    • 한국정보통신설비학회:학술대회논문집
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    • 한국정보통신설비학회 2008년도 정보통신설비 학술대회
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    • pp.257-261
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    • 2008
  • The Digital Radio Mondiale (DRM) system is a digital broadcasting standard designed for use in the LF, MF and HF bands of the broadcasting bands below 30 MHz. The system provides both superior audio quality and improved user services / operability compared with existing AM transmissions. In this paper, we propose a variable point Prime Factor FFT design method for Digital Radio Mondiale (DRM) system. Proposed method processes a various size IFFT/FFT of Robustness Mode on DRM standard efficiently by composing Radix-Prime Factor FFT Processing Unit of form similar to Radix-4 by insertion of a variable Prime Factor Twiddle Factor and Garbage data. So, we improved limitation that cannot process 112/176/256/288 FFT of each mode of DRM system with a existent Radix Processor and increase memory size and memory access time for IFFT/FFT processing by software processing in case of implementation with a existent high speed DSP.

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APPROXIMATING COMMON FIXED POINTS FOR TOTAL ASYMPTOTICALLY NONEXPANSIVE MAPPINGS

  • Kim, Gang-Eun
    • Journal of applied mathematics & informatics
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    • 제30권1_2호
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    • pp.71-82
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    • 2012
  • In this paper, we first show the weak convergence of the modified Ishikawa iteration process with errors of two total asymptotically nonexpansive mappings, which generalizes the result due to Khan and Fukhar-ud-din [1]. Next, we show the strong convergence of the modified Ishikawa iteration process with errors of two total asymptotically nonexpansive mappings satisfying Condition ($\mathbf{A}^{\prime}$), which generalizes the result due to Fukhar-ud-din and Khan [2].

화염급냉 표면처리된 Cu-8.8Al-4.5Ni-4.5Fe 합금의 미세구조 분석 및 내마모성에 관한 연구 (Characterization of the Microstructure and the Wear Resistance of the Flame-Quenched Cu-8.8Al-4.5Ni-4.5Fe Alloy)

  • 이민구;홍성모;김광호;김경호;김흥회
    • 열처리공학회지
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    • 제17권6호
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    • pp.346-355
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    • 2004
  • The flame quenching process has been employed to modify the surfaces of commercial marine propeller material, aluminum bronze alloy (Cu-8.8Al-5Ni-5Fe), and the microstructure, hardness and wear properties of the flame-quenched layers have been studied. The thermal history was accurately monitored during the process with respect to both the designed maximum surface temperature and holding time. The XRD and EDX analyses have shown that at temperatures above $T_{\beta}$, the microstructure consisting of ${\alpha}+{\kappa}$ phases changed into the ${\alpha}+{\beta}^{\prime}$ martensite due to an eutectoid reaction of ${\alpha}+{\kappa}{\rightarrow}{\beta}$ and a martensitic transformation of ${\beta}{\rightarrow}{\beta}^{\prime}$. The ${\beta}^{\prime}$ martensite phase formed showed a face-centered cubic (FCC) crystal structure with the typical twinned structure. The hardness of the flame-quenched layer having the ${\alpha}+{\beta}^{\prime}$ structure was similar to that of the ${\alpha}+{\kappa}$ structure and depended sensitively on the size and distribution of hard ${\kappa}$ and ${\beta}^{\prime}$ phases with depth from the surface. As a result of the sliding wear test, the wear resistance of the flame-quenched layer was markedly enhanced with the formation of the ${\beta}^{\prime}$ martensite.

축상유입식 사이클론의 베인 유출각도에 따른 절단입경 예측에 관한 수치해석 (A Numerical Analysis on Prediction of Cut-diameter according to Vane Outflow Angle in the Axial-flow Cyclone)

  • 이중섭;이치우
    • 한국기계가공학회지
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    • 제11권4호
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    • pp.111-117
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    • 2012
  • Dust collecting performance of axial-vane type cyclone for oil mist was analyzed in this study. For predicting cut diameter size of cyclone, the number and angle of vane ($tan{{\beta}_2}^{\prime}$) was simulated by CFD. As the result, $tan{{\beta}_2}^{\prime}$ was decreased as the number of vane was increased and the angle of inclination(${{\beta}_2}^{\prime}$) decreased, and it cause strong swirl flow. Therefore, it could be confirmed that as the number of vane was increased and the angle of inclination was decreased, cut diameter size was decreased. Also, by verifying the results of CFD through experiment, the cut diameter size could be $2{\mu}m$ at $4m^3/min$ of flow rate.