• 한국의류학회지
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• 제18권2호
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• pp.197-210
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• 1994

The purpose of this study was to Investigate men's clothing in regard to (1) the effect of wearer's age and clothing: rues on impression formation, and (2) the effect of perceiver's age on impressions formed by the wearer's age and the fuction of clothing cues. The experimental design of this study was between-subjects 24_full factorial design by 4 independent variables. The subjects consisted of 192 subjects in each of two male perceiver groups according to age(20s and 50s). The experimental moterials developed for the study were a set of stimuli al)d a response scale. The stimuli consisted of 16 color photographs made by identical manipulations of 4 independent variables consisting of 2 levels each. Each one of the sixteen sub-samples included 12 subjects from 2 perceiver groups. The independent variables provided by the photographs were (1) wearer's age (20s and 50s), (2) suit color (navy blue and beige),' (3) suit style (single breasted and double breasted), and (4) necktie color (analogous and complementary colors) . The 7-point semantic differential response scale which was designed to measure the impression of the stimuli was composed of 30 bipolar adjectives. The responses to the semantic differential scales were analyzed using factor analysis and ANOVA. The results were as follows:1) Wearer's age, suit color, suit style, and necktie color had significant effects on impression of the 3 factors (appearance·potency, individuality activity, and evaluation) partiafly. However, the suit style was the most dominent clothing cue : the single breasted suit conveyed positive impression of individuality' activity to both of the wearer's age groups than double breasted suit did on both of the perceiver's age groups. 2) Perceiver's age partially influenced impressions formed by the age and the clothing cues of men clothed in suits : the young perceiver's group was less affected by them than middle aged group.

• 한국결정성장학회지
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• 제3권2호
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• pp.99-106
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• 1993

열분석(DTA : Differential Thermal Analysis) 방법에 의한 퀴리온도$(T_c)$ 측정방법으로부터 48.50에서 49 $Li_2O$ mole %까지의 퀴리온도$(T_c)$와 $Li_2O$ mole %(C)의 관계식 $(T_c = -17.869C^2+1840.2C-46623)$을 구하였다.$LiTaO_3$ 단결정의 congruent 조성을 결정하기 위하여 48.60 부터 48.70 mole %까지의 영역에서 쵸크랄스키법으로 $LiTaO_3$ 단결정을 육성하고 Top과 Tail 결정에서의 퀴리온도 차이,${\Delta}{T_c} (T_{c(Top)}-T{_c(Tail)})$ 그리고 결정성장 초기와 말기의 융액과 결정의 조성비로부터 분배계수(k)를 구하였다. 이 결과로부터 결정된 congruent 조성은 48.65 mole %였으며 그때의 $(T_c)$ 값은 $610{\pm}1^{\circ}C$였다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -1
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• pp.86-89
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• 2002

A new design approach for realising low-power low-voltage high-Q high-order RE bandpass filter is proposed. Based on the gyrator-C inductor topology, a 2$\^$nd/-order biquadratic bandpass filter can be realised by adding a series capacitor to the input port of the gyrator. High-Q 2$\^$nd/-order and 4$\^$th/-order fully differential RF bandpass filters operating in the 2.4-㎓ ISM (Industrial, scientific and medical) frequency band under a 2-V single power supply voltage with low power dissipation are reported.

• 대한수학회논문집
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• 제12권2호
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• pp.305-309
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• 1997

In this paper we prove the existence of a special type of multivortex solutions of $SU (N)_g \times U(1)_l$ Chern-Simons model. More specifically we prove existence of solutions of the self-duality equations for $(\Phi(x), j =1, \cdots, N$ has the same zeroes. In this case we find that the equation can be reduced to the single semilinear elliptic partial differential equations studied by Caffarelli and Yang.

• 전자공학회논문지A
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• 제28A권1호
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• pp.46-51
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• 1991

The new signal process circuit using ISFETs as two input devices of a MOS differential amplifier stage for application to a ISFET biosensor was developed and its operational characteristics simulated. For a single chip integration of ISFETs, developed signal process circuit and metal reference electrode, serial studies including process development and chip layout was carried out.

• 대한수학회논문집
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• 제22권4호
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• pp.623-640
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• 2007

The Lotka-McKendrick model which describes the evolution of a single population is developed from the well known Malthus model. In this paper, we introduce the Lotka-McKendrick model. We approximate the solution to the model using hp-discontinuous Galerkin finite element method. The numerical results show that the presented hp-discontinuous Galerkin method is very efficient in case that the solution has a sharp decay.

• 한국정보통신학회논문지
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• 제25권11호
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• pp.1512-1518
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• 2021

단일세포 RNA-Seq 은 개별 세포의 유전자 발현을 제공하므로 세포마다 차등적인 고해상도 정보를 준다. 단일세포 RNA-Seq 자료에 대하여 군집화는 세포의 유형과 고수준의 생물 과정을 이해하기 위하여 수행된다. 매우 고차원이고 대용량인 단일세포 RNA-Seq을 효과적으로 처리하기 위하여, 본 논문은 변이 자동인코더를 사용하여 고차원의 자료공간을 저차원의 잠재공간으로 변환하여, 보다 정확한 군집화를 수행할 수 있는 특징공간을 만든다. 차원이 축소된 잠재공간에 다양한 군집화 방법을 적용하는 접근을 다양한 전통적인 단일세포 RNA-Seq 군집화 방법과 성능을 비교하였다. 군집화 실험을 통하여, 제안한 방법은 기존 방법들보다 다양한 군집화 성능기준에서 성능이 개선되었다.

• 한국전자파학회논문지
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• 제28권5호
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• pp.366-372
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• 2017

본 논문에서 제시하는 내용은 수신단의 관문 역할을 담당하는 차동 저 잡음 증폭기를 구현 시, 필연적으로 설계가 필요한 발룬에 대한 분석 내용이다. 발룬은 안테나로부터 입력된 단일 신호를 차동 신호로 변환시켜줌으로써 차동 증폭기의 입력으로 사용될 수 있도록 하는 역할을 담당한다. 이 뿐만 아니라, 안테나를 통해서 들어오는 ESD(Electrostatic Discharge)로부터 회로를 보호하고, 입력 정합에 도움을 준다. 하지만, 일반적으로 사용되는 수동형 발룬의 경우, 두 금속선 사이에 형성되는 전자기적 결합을 통해 교류 신호를 전달하는 방식이므로 이득없이 손실을 가지게 될 뿐 아니라 결론적으로 수신단 전체 잡음 지수 저하에 가장 큰 영향을 미치게 된다. 그러므로, 저 잡음 증폭기에서 발룬의 설계는 매우 중요하며, 선로의 폭, 선로 간격, 권선수, 반경, 그리고 레이아웃의 대칭 구조 등을 고려하여 높은 양호도(quality factor)와 차동 신호의 역위상을 만들어내야만 한다. 본문에서 발룬의 양호도를 높이기 위해 고려해야할 요소들을 정리하고, 설계 요소변경에 따른 발룬의 저항, 인덕턴스, 그리고 캐패시턴스의 변화 경향성을 분석하였다. 분석 결과를 바탕으로 입력 발룬을 설계함으로써 이득 24 dB, 잡음 지수 2.51 dB의 저잡음, 고 이득 차동 증폭기 설계가 가능함을 증명하였다.

• 대한자원환경지질학회:학술대회논문집
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• 대한자원환경지질학회 2002년도 춘계 공동학술발표회
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• pp.167-169
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• 2002

The extended Born, or localized nonlinear approximation of integral equation (IE) solution has been applied to inverting single-hole electromagnetic (EM) data using a cylindrically symmetric model. The extended Born approximation is less accurate than a full solution but much superior to the simple Born approximation. When applied to the cylindrically symmetric model with a vertical magnetic dipole source, however, the accuracy of the extended Born approximation is greatly improved because the electric field is scalar and continuous everywhere. One of the most important steps in the inversion is the selection of a proper regularization parameter for stability. Occam's inversion (Constable et al., 1987) is an excellent method for obtaining a stable inverse solution. It is extremely slow when combined with a differential equation method because many forward simulations are needed but suitable for the extended Born solution because the Green's functions, the most time consuming part in IE methods, are repeatedly re-usable throughout the inversion. In addition, the If formulation also readily contains a sensitivity matrix, which can be revised at each iteration at little expense. The inversion algorithm developed in this study is quite stable and fast even if the optimum regularization parameter Is sought at each iteration step. Tn this paper we show inversion results using synthetic data obtained from a finite-element method and field data as well.

• Coupled systems mechanics
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• 제10권1호
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• pp.39-60
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• 2021

The present paper is concerned with the study of nonlinear ultrasonic waves in a magneto thermo (MT) elastic armchair single-walled carbon nanotube (ASWCNT) resting on polymer matrix. The analytical formulation is developed based on Eringen's nonlocal elasticity theory to account small scale effect. After developing the formal solution of the mathematical model consisting of partial differential equations, the frequency equations have been analyzed numerically by using the nonlinear foundations supported by Winkler-Pasternak model. The solution is obtained by ultrasonic wave dispersion relations. Parametric work is carried out to scrutinize the influence of the non local scaling, magneto-mechanical loadings, foundation parameters, various boundary condition and length on the dimensionless frequency of nanotube. It is noticed that the boundary conditions, nonlocal parameter, and tube geometrical parameters have significant effects on dimensionless frequency of nano tubes. The results presented in this study can provide mechanism for the study and design of the nano devices like component of nano oscillators, micro wave absorbing, nano-electron technology and nano-electro- magneto-mechanical systems (NEMMS) that make use of the wave propagation properties of armchair single-walled carbon nanotubes embedded on polymer matrix.