• 천문학회보
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• 제36권1호
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• pp.53.2-53.2
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• 2011

A small number of active galactic nuclei are known to exhibit prominent double peak emission profiles indicating the presence of a relativistic accretion disk model. Using a Monte Carlo technique, we compute the linear polarization of a double peaked broad emission line. A Keplerian accretion disk is adopted for the double peak emission line region and the Schwarzschild geometry is assumed in the emission region. Far from the accretion disk where flat Minkowski geometry is appropriate, we place a scattering region in the shape of a spherical shell sliced. We generate a line photon in the accretion disk in an arbitraray direction in the local rest frame and follow the geodesic of the photon until it hits the scattering region. The profile of the polarized flux is mainly determined by the relative location of the scattering region with respect to the emission source. When the scattering region is in the polar direction, the linear degree of polarization also shows a double peak structure. Under a favorable condition we show that up to 1% of linear degree of polarization may be obtained.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 1998년도 추계학술대회 학술발표 논문집
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• pp.31-36
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• 1998

This paper proposes a method to select essential elements in a human evaluation model using the Choquet integral based on fuzzy measures and applies the model to the evaluation of human interface. Three kinds of concepts, Increment Degree, average of Increment Degree, Necessity coefficient, are defined. The proposed method selects essential elements by the use of the Relative necessity coefficient. The proposed method is applied to the analysis of human interface. In the experiment, (1) a warning sound, (2)a color vision, (3) the size of working area, (4) a response of confirmation, are considered as human interface elements. subjects answer the questionnarie after the experiment. From the data of questionnaire, fuzzy measures are identified and are applied to the proposed model. effectiveness of the proposed model is confirmed by the comparison of human interface elements extracted from the proposed model and those from the questionnarie.

• The Korean Journal of Ceramics
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• 제6권4호
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• pp.405-407
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• 2000

Polycrystalline films of Ni- and Co-ferrites films are prepared from aqueous solution at $90^{\circ}C$ by ferrite plating, which are subjected to Fe$^57$ conversion electron Mossbauer spectroscopy in backscatter mode. The average angle of Fe spins relative to the film plane is evaluated as 18 degree and 82 degree for the Ni- and Co-ferrite films, respectively, indicating a prominent magnetic anisotropy parallel and perpendicular to the film plane. It was also verified by the magnetization measurements.

• 융합신호처리학회 학술대회논문집
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• 한국신호처리시스템학회 2003년도 하계학술대회 논문집
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• pp.177-182
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• 2003

The robust output tracking control problem of general nonlinear MIMO systems is discussed. The robustness against parameter uncertainties is considered. In this paper, we proposed the robust output tracking control scheme for a class of MIMO nonlinear dynamical systems using output feedback linearization method. The presented control scheme is based on the VSS. We assume that the nonlinear dynamical system is minimum phase, the relative degree of the system is r$_{1}$＋r$_{2}$＋…r$_{m}$$\leq$ n and zero dynamics is stable. It is shown that the outputs of the closed-loop system asymptotically track given output trajectories despite the uncertainties while maintaining the boundedness of all signals inside the loop. And we verified that the proposed control scheme is then applied to the control of a two degree of freedom (DOF) robotic manipulator with payload.d.

• Bulletin of the Korean Chemical Society
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• 제19권4호
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• pp.439-444
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• 1998

The protonation of tetraphenylporphyrin (TPP) in acidic organic solutions was analyzed by acid titrimetric and temperature-dependent absorption measurements. Competition between the protonation of free base TPP $(TPPH_2)$ and the solvation of proton by near solvent molecules determines the equilibrium of the diprotonated TPP $(TPPH_4^{2+})$ formation. The diprotonated TPP exists as an ion pair complex with the acid counterions, which are found to affect the degree of red shift of the Soret band. The rotation of the phenyl rings also plays an important role in the diprotonation, as suggested by the decrease in the degree of diprotonation for the fluorophenyl TPP derivatives whose phenyl ring rotation is significantly hindered relative to normal TPP. The difference of fluorescence lifetime between $TPPH_2 \;({\pi}_{FL}=19.6\;ns)\; and\; TPPH_4^{2+} \;({\pi}_{FL}=2.1 \;ns)$ was used advantageously to measure the rate of protonation in the excited state. The protonation of TPPH2 are found to occur much slower than the diffusion of protons from bulk solution to the porphyrin ring. The monoprotonated TPP is suggested to be the transient species for the diprotonation process.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2020년도 봄 학술논문 발표대회
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• pp.31-32
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• 2020

Concrete changes its internal moisture distribution depending on the external environment, and changes in the condition of the material's interior over time affect the performance of the concrete. These effects are closely related to the long-term behavior and durability of concrete, and the degree of deterioration varies from climate to climate in each region. In this study, we use actual climate data from each region with distinct climates. A multi-physical analysis based on the method was conducted to predict the difference and degree of deterioration rate by climate.

• 한국전기전자재료학회논문지
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• 제11권11호
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• pp.1014-1021
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• 1998

We evaluated the effect of processing variables on microstructural evolution interface irregularity between Ag sheath and superconductor core and resultant critical current density(J$_{c}$) of (Bi,Pb)$_2$Sr$_2$Ca$_2$Cu$_3$O$_{x}$(2223) superconductor tape. The value of J$_{c}$ was significantly influenced by the interface irregularity, degree of texturing and relative 2223 content. The interface became more irregular(sausage effect), while the degree of texturing gradually improved as the dimension of tape decreased during forming process. As the dimension of wire/tape were changed from diameter of 3.25 mm to thickness of 0.20 mm, J$_{c}$ value was observed to be increased by 10 times. In addition, optimum sintering temperature for improved J$_{c}$ was observed to be 835$^{\circ}C$ in a ambient atmosphere probably due to combined effect of both improved texturing and high 2223 content. Microstructural investigation showed the degree of texturing was degraded by the existence of both second phases and interface irregularity. It was observed that larger grain size and better texturing was developed near relatively flat interface compared to those inside superconducting core.ting core.

• 정보관리학회지
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• 제19권3호
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• pp.145-160
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• 2002

본 논문은 기존의 학회지 중심의 연구와는 다른 현장중심의 학술지를 통하여 문헌정보학의 연구동향을 파악하기 위하여 1996년부터 2000년까지 "도서관", "국회도서관보", "도서관문화"에 게재된 논문을 대상으로 하여 문헌정보학 분야의 연구영역과 주제의존도 및 학심저널을 분석하고자 하였다. 본 연구 결과, 실무에 있어서의 주된 연구분야는 문헌정보학분야에 대한 의존도가 큰 것으로 나타났으며 정보학에 대한 의존도는 낮은 것으로 분석되었다.났으며 정보학에 대한 의존도는 낮은 것으로 분석되었다.

• 한국가정과교육학회지
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• 제10권2호
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• pp.67-78
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• 1998

The purposes of this study is to find middle school student's needs for Home Economics Curriculum and the family life participation. The samples are 323 middle school students in Kangneung. The results of this study are summarized follows; 1. It is shown that the family life participation of boys was higher than that of girls. 2. Variables that affect middle school student's needs for Home Economics curriculum are needs for Home Economics, number of brothers and sisters and the age for mother. 3. Variables that affect middle school student's the family life participation are human development and family relationship, the clothing, participation in class of Home Economics, perception of life status and sex. 4. The relative contributions of independent variables of the family life participation of middle school students are as follows. The degree of explanation of middle school student's family environmental variable is 12.2%. Adding the variable of Home Economics course, the degree of explanation is increased to 21.8%(deviation 9.6%). Adding the variable of needs for Home Economics curriculum, the degree of explanation is increased to 33.1% (deviation 11.3%).

• 한국식품영양과학회지
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• 제20권6호
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• pp.646-652
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• 1991

품종을 달리한 쌀 전분에서 호화온도에 영향을 주는 인자들을 조사하였다. 품종에 따라 호화온도, 아밀로오스 함량, 전분입자의 크기 분포도 및 결정화도는 모두 유의적인 차이를 보여주었다(${\alpha}=0.01$). 전분의 호화온도는 전분입자의 결정화도와 높은 양의 상관관계를 보여주었다(r=0.67, p<0.01). 그러나 전분입자의 크기분포와 아밀로오스 함량은 쌀 전분의 호화온도에 전혀 영향을 주지 못했으며, 이는 상관관계 계수와 주사 전자현미경에 의한 관찰에 의해 확인되었다. 또한 쌀 전분입자의 성상 및 크기와 아밀로오스 함량과는 아무런 관계가 없음이 주사 현미경 관찰에 의해 확인되었다.