• 대한수학회지
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• 제45권2호
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• pp.377-392
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• 2008

Let X be a real reflexive Banach space with a uniformly $G\hat{a}teaux$ differentiable norm, C a nonempty closed convex subset of X, T : C $\rightarrow$ X a continuous pseudocontractive mapping, and A : C $\rightarrow$ C a continuous strongly pseudocontractive mapping. We show the existence of a path ${x_t}$ satisfying $x_t=tAx_t+(1- t)Tx_t$, t $\in$ (0,1) and prove that ${x_t}$ converges strongly to a fixed point of T, which solves the variational inequality involving the mapping A. As an application, we give strong convergence of the path ${x_t}$ defined by $x_t=tAx_t+(1-t)(2I-T)x_t$ to a fixed point of firmly pseudocontractive mapping T.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 하계종합학술대회 논문집(4)
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• pp.167-170
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• 2002

In this paper, we implement a 2.4 kbps STC speech codec using the TMS320C6201 DSP The main job for this work is twofold: one is to convert floating-point operation in the codec into fixed-point operation while maintaining the high resolution, and the other is to optimize the program to make it run in real time with memory size as small as possible. The implemented decoder uses 54.8 kbyte of program memory, 29.7 kbyte of data ROM and 55.2 kbyte of data RAM, respectively. It also uses about 45% of maximum computation capacity of TMS320C6201.

• 천문학논총
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• 제4권1호
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• pp.1-15
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• 1989

A jet plasmoid model for 3C.449 has been constructed by introducing a plasma.ejecting black hole orbiting around the center of its parent cD galaxy. We examined the characteristics of the jet trajectory by varying the values of (1) orbiting radius and velocity of the black hole, (2) plasma ejection velocity, (3) size, mass and space velocity of the parent galaxy, (4) size of the galactic core and (5) the density of the intergalactic medium. In our model calculation the effect of the gravity by the parent galaxy and the ram pressure by the intergalactic medium have been taken in account. It is found that our dynamical model accounts reasonably well for the observed structure of 3C449. Our proposed model suggests that the buoyancy force near the galactic center plays an important role in the formation of the curved structure of the radio jet.

• 대한전자공학회논문지SP
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• 제38권3호
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• pp.68-68
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• 2001

본 논문에서는 3GPP와 ETSI에서 IMT-2000의 음성부호화 방식 표준안으로 채택한 AMR 음성부호화 알고리즘을 분석하고 C 컴파일러와 어셈블리 언어를 이용한 최적화 과정을 거친 후, 고정 소수점 DSP 칩인 TMS320C6201을 이용하여 실시간 구현하였다. 구현된 codec의 프로그램 메모리는 약 31.06 kWords, 데이터 RAM 메모리는 약 9.75 kWords, 그리고 데이터 ROM 메모리는 약 19.89 kWords 정도를 가지며, 한 프레임(20 ms)을 처리하는데 약 4.38 ms가 소요되어 TMS320C6201 DSP 칩의 전체 가용한 clock의 21.94%만 사용하여도 충분히 실시간으로 동작 가능함을 확인하였다. 또한, DSP 보드상에서 구현한 결과가 ETSI에서 공개한 ANSI C 소스 프로그램의 수행 결과와 일치함을 검증하였고, 구현된 AMR 음성부호화기를 sound I/O 모듈과 결합하여 실험한 결과, 어떠한 음질의 왜곡이나 지연 없이 실시간으로 충분히 동작함을 확인하였다. 마지막으로, Host I/O와 LAN 케이블을 이용하여 AMR 음성부호화 알고리즘을 통한 쌍방간 실시간 통신을 full-duplex 모드로 확인하였다.

• ETRI Journal
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• 제9권1호
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• pp.37-42
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• 1987

개인용 전자자동설계 시스팀인 EDAS_P의 schematic으로부터 직접 디지틀 회로의 논리동작을 시뮬레이션할 수 있는 게이트 레벨 논리 시뮬레이터(GLSIM_P)를 IBM PC에서 C언어를 이용하여 개발하였다. 다룰수 있는 소자로는 input clock, 일반 게이트 및 clocked 게이트, ROM, RAM, PLA등이다. 논리신호 레벨은 1, 0,*(intermediate)이다. 효율적인 논리해석을 위해 selective trace 및 event driven 방식을 도입하였으며 게이트 500개 정도까지 해석이 가능하다.

• 대한수학회논문집
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• 제35권1호
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• pp.151-159
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• 2020

We introduce the notion of (m, n)-paranormal operators and (m, n)^⁎-paranormal operators on Hilbert space and study their properties. We also characterize these operators. Examples of operators are given which are (m, n)-paranormal but not (m, n)^⁎-paranormal, and vice-versa.

• 대한수학회논문집
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• 제35권3호
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• pp.843-854
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• 2020

The purpose of this present paper is to obtain inclusion relations between various subclasses of harmonic univalent functions by using the convolution operator associated with generalized distribution series. To be more precise, we obtain such inclusions with harmonic starlike and harmonic convex mappings in the plane.

• 대한의용생체공학회:의공학회지
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• 제11권1호
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• pp.57-64
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• 1990

This study describes the design of the portable intelligent QT analyzer which can record and analyze the ambulatory ECG data. System hardware is consisted of the one chip microcomputer(80C31) , A/D, ROM, RAM, LCD display and preamplifier. ECG data were processed by the differentiator and the digital filter. The de- tection of the parameters-QT, QTP and RR interval-was accomplished by the software algorithm using the slope and the amplitude of the processed data. Using this system, the trends of the parameters obtained during the long term could be observed.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 하계종합학술대회 논문집(4)
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• pp.413-416
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• 2002

In this paper, a speech enhancement system using microphone array with adaptive Post-Processing is implemented in real-lime with TMS320C6201 DSP. It consists of delay-and-sum beamformer and adaptive post-processing filters with NLMS (Normalized Least Mean Square) algorithm. THS1206 ADC is used for collection of 4-channel microphone signals. Sizes of program memory, data ROM and data RAM of the implemented system are 15,744, 748 and 47,540 bytes, respectively. Finally 21.839${\times}$106 clocks per second is required for real-time operation.

• Bulletin of the Korean Chemical Society
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• 제31권6호
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• pp.1732-1734
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• 2010