• 소프트웨어공학소사이어티 논문지
• /
• 제29권2호
• /
• pp.1-6
• /
• 2020

소프트웨어 제품라인 개발은 제품군의 개발을 위하여 공통적인 부분과 가변적인 부분을 분리 개발함으로써 중복개발을 피하여 효율적으로 제품군을 개발하는 개발 패러다임이다. 소프트웨어 제품라인 개발에서 제품군을 생성하기 위해 사용되는 소스코드를 제품라인 코드 베이스라고 부르고, 제품라인 코드 베이스가 변경되어 제품군의 제품들이 영향을 받을 때 영향 받은 제품들을 시험하는 활동을 제품라인 회귀시험이라고 한다. 이 때 제품군의 각 제품을 개별적으로 시험하는 대신, 변경과 무관한 시험을 파악하여 피할 수 있다면 효율적인 제품라인 회귀시험이 가능해 질 것이다. 본 논문은 이런 방법으로 소프트웨어 제품라인 회귀시험을 효율적으로 수행하는 자동화된 방법인 SRTS를 소개한다. 이 방법은, 먼저 제품라인 코드 베이스와 시험 항목을 공통성과 가변성을 기반으로 나누고 변경에 영향을 받는 시험 항목을 식별하여 선택한 후, 선택된 시험 항목만을 재실행함으로써 불필요한 시험을 줄인다.

• 대한기계학회논문집B
• /
• 제30권7호
• /
• pp.622-629
• /
• 2006

The shape optimization of blade sweep in a transonic axial compressor rotor of NASA Rotor 37 has been performed using response surface method and the three-dimensional Wavier-Stokes analysis. Two shape variables of the rotor blade, which are used to define the rotor sweep, are introduced to increase the adiabatic efficiency of the compressor. Throughout the optimization, optimal shape having a backward sweep is obtained. Adiabatic efficiency, which is the objective function of the present optimization, is successfully increased. Separation line due to the interference between a shock and surface boundary layer on the blade suction surface is moved downstream for the optimized blade compared to the reference one. The increase in adiabatic efficiency for the optimized blade is caused by suppression of the separation due to a shock on the blade suction surface.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2001년도 제14회 신호처리 합동 학술대회 논문집
• /
• pp.85-88
• /
• 2001

In this paper we consider a problem of blind co-channel signal separation, the goal of which is to estimate multiple co-channel digitally modulated signals using an antenna array. We employ the joint maximum likelihood estimation and present a sequential algorithm, which is referred to as sequential joint maximum likelihood (SJML) algorithm. It separates multiple co-channel signal on-line and converges fast in overdetermined noisy communication environment. And the computational complexity of SJML for M-QAM (M=8, 16, 64,...) signals is less expensive compared to the SLSP. Useful behavior of this algorithm are confirmed by simulations.

• 분석과학
• /
• 제24권6호
• /
• pp.407-413
• /
• 2011

지난 10년간 고해상도 탠덤질량분석기에 사용되는 다양한 미세관 HPLC들이 개발되어 단백체분석연구에 사용되어져 왔다. 질량분석에 앞선 분리과정은 샘플 중의 불순물을 제거하며, 분석물을 좁은 용리 피크 내에 농축함으로써 이어지는 질량분석의 민감도를 향상시킬 수 있다. 본 총설에서는 복잡한 단백체 분석에 사용되는 미세유체 칩을 기반으로 하는 고성능 분리 기술들의 최근 개발 동향을 고찰하였다.

• 한국마린엔지니어링학회:학술대회논문집
• /
• 한국마린엔지니어링학회 2006년도 전기학술대회논문집
• /
• pp.279-280
• /
• 2006

In the present study the flow fields around pitching foils have been visualized by using a Schlieren method with a high speed camera in a wind tunnel at low Reynolds number regions. It has been observed that small vortices are shed discretely from the leading and trailing edge and that they stand in line on the integrated streakline of separation shear layer. By counting vortices in the VTR frames it was clarified that the number of vortex shedding from the leading and trailing edge during one pitching cycle strongly depends on the non-dimensional pitching rate.

• 전기학회논문지
• /
• 제57권2호
• /
• pp.179-183
• /
• 2008

In case of a line-to-ground fault at transmission lines, a portion of fault current will flow into the earth through the footings of the faulted tower causing electrical potential rise nearby the faulted tower footings. In this situation, any buried pipelines or structures nearby the faulted tower can be exposed to the electrical stress by earth potential rise. Although many research works has been conducted on this phenomena, there has been no clear answer of the required separation distance between tower footings and neary buried pipeline because of its dependancy on the soil electrical charactersics of the concerned area and the faulted system. In this paper, an analytical formula to calculate the requried sepeartion distance from the faulted tower has been derived.

• 한국자기공명학회논문지
• /
• 제4권2호
• /
• pp.91-102
• /
• 2000

The photoproduced cation radical of N-methylphenothiazine doped in the different kind of matrices of phenyltriethoxysilane (PhiTEOS), vinyltriethoxysilane (VTEOS), and methyloiethoxysilane (METOS) was comparatively studied with electron spin resonance (ESR) and electron nuclear double resonance (ENDOR). The photoinduced charge separation efficiency was determined by integration of ESR spectra which correspond to the amount of photoproduced cation radical in the matrices. This was correlatively studied with the polarity and pore size of the gel matrices. The polarity of the matrices was comparatively determined by measuring λ$\sub$max/ values of PC$_1$ in the different matrices. The relative pore size among the matrices was determined by measuring relative proton matrix ENDOR line widths of the photoproduced cation radical of PCI. The decay kinetic constants of the cation radical of PCI in the different matrices was relatively studied with fitting the biexponential decay curves after exposure into the ambient condition. This is correlatively interpreted with the polarity and pore size of the matrices.

• Environmental Analysis Health and Toxicology
• /
• 제12권3_4호
• /
• pp.75-84
• /
• 1997

Chromatographic retention behavior and separation of various phenol derivatives on a Partisil 10 ODS 3 column-with mobile phase containing $\alpha$-cyclodextrin-were systematically studied. The decrease in k' values caused by the addition of cyclodextrins in the mobile phase was based on the formation of an inclusion complex, resulting in weakening of the hydrophobic interaction between solutes and the stationary phase. The content of the organic solvent in the mobile phase also influenced k' values of the solutes, and k' values increased with a decrease of the content of organic solvent in the mobile phase. A simple equation has been derived that reveals the hyperbolic dependence of the capacity factor on the total concentration of cyclodextrin. A plot of the reciprocal of the capacity factor against (CD)$_T$ gives a straight line and the dissociation constant, K$_D$, of the inclusion complex can be calculated from the slope. The capacity factor decreased with increasing temperature. The enthalpy was calculated from the slope of van't Hoff plots. Under optimum conditions, some mixtures of phenol derivatives were able to separated successfully.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2005년도 추계학술대회 논문집 전기설비전문위원
• /
• pp.53-55
• /
• 2005

Because of the continuous growth of energy consumption and also the tendency to site power lines and pipelines along the same route, the close proximity of power lines and buried metallic pipelines has become more and more frequent. The lightning strokes collected by an electric substation or power line tower might cause arcing through the soil to an adjacent gas pipeline. This paper gives the review of the breakdown mechanism and the standards of separation distance between lower and pipelines.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2007년도 Techno-Fair 및 추계학술대회 논문집 전기물성,응용부문
• /
• pp.212-213
• /
• 2007

In case of a line-to-ground fault at transmission lines, a portion of fault current will flow into the earth through the footings of the faulted tower causing electrical potential rise nearby the faulted tower footings. In this situation, any buried pipelines or structures nearby the faulted tower can be exposed to the electrical stress by earth potential rise. Although many research works has been conducted on this phenomena, there has been no clear answer of the required separation distance between tower footings and neary buried pipeline because of its dependancy on the soil electrical charactersics of the concerned area and the faulted system. In this paper, an analytical formula to calculate the requried sepeartion distance from the faulted tower has been derived.