ERROR ESTIMATES FOR THE FULLY DISCRETE STABILIZED GAUGE-UZAWA METHOD -PART I: THE NAVIER-STOKES EQUATIONS

Pyo, Jae-Hong The Kangwon-Kyungki Mathematical Society 2013 한국수학논문집 Vol.21 No.2

The stabilized Gauge-Uzawa method (SGUM), which is a second order projection type algorithm to solve the time-dependent Navier-Stokes equations, has been newly constructed in 2013 Pyo's paper. The accuracy of SGUM has been proved only for time discrete scheme in the same paper, but it is crucial to study for fully discrete scheme, because the numerical errors depend on discretizations for both space and time, and because discrete spaces between velocity and pressure can not be chosen arbitrary. In this paper, we find out properties of the fully discrete SGUM and estimate its errors and stability to solve the evolution Navier-Stokes equations. The main difficulty in this estimation arises from losing some cancellation laws due to failing divergence free condition of the discrete velocity function. This result will be extended to Boussinesq equations in the continuous research (part II) and is essential in the study of part II.

비정질 인듐갈룸ᅳ아연-산화물 박막트랜지스터 기반의 AMOLED 화소 회로

이재표(Jae-Pyo Lee),유경민(Kyeong-Min Yu),장진녕(JinNyoung Jang),홍문표(MunPyo Hong),배병성(Byung Seong Bae) 호서대학교 공업기술연구소 2013 공업기술연구 논문집 Vol.32 No.2

본 논문은 비정질 인둠ᅳ갈f ᅳ아연-산화물 박막트랜지스터 (a-IGZO TFT)를 이용하여 능동형 유기발광다이오드 (AMOLED)용 문턱전압(Vth )을 보상하는 화소 회로를 제안하였다. 산화물 TFT는 n-채널 TFT로써, 우리는 n-채널 TFT 특성으로 회로를 최적화하였다. 제안된 화소 회로는 회로 시뮬레이션 뿐만 아니라 회로 분석을 이용하여 확인되었다. 제안된 화소 회로는 AMOLED에서 구동 TFT의 문턱전압 변화를 보상할 수 있다. 제안된 화소 회로를 이용함으로써, 문턱전압 보상은 달성되었다. rhis paper proposes a tnresnold voltage compensation pixel circuit for active-matrix organic light-emitting diode (AM OLED) using amorphous indium-gaUiimi-zinc-oxide thin-film transistors (a-IGZO TFTs), Oxide TFT is an n-channel TFT; therefore, we optimized the circuit for the n-channel TFT characteristics. The proposed pixel circuit was verified using circuit analysis as well as circuit simulations. The proposed circuit could compensate for the threshold voltage variations o f drive TFT in AM OLED. Using the proposed pixel circuit, threshold voltage compensation was achieved.

씨름 지도자의 행동유형과 선수만족과의 관계

홍장표,이재학,방한효 龍仁大學校 武道硏究所 2002 武道硏究所誌 Vol.13 No.1

The purpose of this study was to consider the features of teaching behavior and each teaching behavior was compared and analysed with group cohesion in Korea Ssireum. The researcher worked with 30 high school teams, 15 college teams, 12 ordinary teams and 4 falk teams belonging to Korea Ssireum Association and the Korea Ssireum Federation from February, 2002. The researcher made a radome choice of 10 players each team and worked with a total of 570 players with questionnaries. The researcher conducted a frequency analysis, a correlation analysis and regression analysis with SPSS 10.0 and the significant level of all the hypothesis tests stands at a=.05. The conclusions of this study were as follows: First, there was a high correlation for the all subordinate variables in teaching behavior of leaders. The survey showed that there was a positive influence at a level of 1 percent. And there was no correlation between authority behavior and group cohesion with a negative influence at a level of 1 percent. Second, there were influences both training behavior and compensation behavior for player relationship, life satisfaction of player was affected in training behavior and democratic behavior with a positive influence at a level of 5 percent. And life frustration of player was affected in training behavior, social support behavior and compensation behavior, specially training behavior and compensation behavior were affected with a positive influence at a level of 5 percent.

연약지반상 교대의 측방이동에 대한 대책공법

홍원표,이재호,송영석 중앙대학교 기술과학연구소 2003 기술과학연구소 논문집 Vol.33 No.-

한 도로교량의 교대를 시공한 후 상부거더가 교대 흉백으로 밀려들어가는 현상이 발생 되었다. 이 교량교대를 대상으로 기초연약지반의 특성을 분석하고, 사면안정해석을 실시하여 교대의 측방이동 여부를 판정하여 보았다. 판정결과 교대의 측방이동은 계속적으로 발생될 것으로 예측되어, 합리적인 대책공법을 고찰한다. 여러 가지 대책공법을 분류 · 분석 한 후 본 현장에 적합한 대책공법으로서 성토지지말뚝공법으로 분류되는 파일슬래브 공법이 선정된다. 본 공법은 교대 배면에 말쪽을 설치하여 성토하중을 지지층으로 전달함으로써 연약지반의 측방유동을 억제하는 공법이다. 또한 대책공법 적용 후 교대의 안정성을 확인할 수 있는 현장계측시스템을 도입한다. After construction of bridge abutment of a bridge for roads, steel box girder of bridge was moved into the parapet wall of abutment. Based on analysis of geotechnical characteristics and slope stability, the judgement of lateral movement of bridge abutment on soft ground is performed. As a result of judgement. various countermeasures are analyzed to prevent against the lateral movement of bridge abutment. The pill slab method among the various countermeasures is based on embankment pile which is installed in soft ground to decrease the overburden due to embankments Also, field instrumentation system is installed to observe reinforced effect of the countermeasures and stability of bridge abutment.

씨름 지도자의 지도유형 분석에 관한 연구

홍장표,권창기,이재학,성낙훈 龍仁大學校 武道硏究所 2003 武道硏究所誌 Vol.14 No.1

The purpose of this study was to inquire leadership types of coaches engaged in Ssirum and to provide fundamental data for improvement of their leadership by analyzing their leadership types based on several variables such as age, Ssirum teams, training career, personal game record, and team game record. The results of this study are as follows: First, according to the analysis of the degree of leadership types in relation to the age of Ssrium players, the result showed that there were significant differences on democratic, autocratic, social support, and positive feedback except for training(P<.05). Second, according to the analysis of the degree of leadership types in relation to the Ssirum teams, the result showed that there were significant differences on training, democratic, autocratic, social support, and positive feedback(p<.05). Third, according to the analysis of the degree of leadership types in relation to the training career of Ssirum players, the result showed that there were no significant differences on training, democratic, autocratic, and positive feedback. On the contrary, there was significant difference on social support(p<.05). Fourth, according to the analysis of the degree of leadership types in relation to the personal game record of Ssirum players, the result showed that there were no significant differences on autocratic and social support. On the contrary, there were significant differences on training, democratic, and social support(p<.05). Fifth, according to the analysis of the degree of leadership types in relation to the team game record of Ssirum players, the result showed that there were no significant differences on autocratic. On the contrary, there were significant differences on training, democratic, social support, and positive feedback(p<.05).

ADPCM 통신을 위한 ISDN 기본율 접속구조

홍진표,허재헌,권원현 안양대학교 자연과학연구소 1995 自然科學硏究 Vol.2 No.-

비저지 시스템을 강력하게 추진하려는 전송설비와 통신망에 저속 코딩 기술이 출현하고 있다. 본 논문에서는 하나의 국제 표준 ISDN 기본율 접속을 통한 ADPCM 음성전송을 위하여 스위치 액세스 구조를 제안하였다. 제안한 구조에서는 2개, 3개 또는 4개의 음성 터미날과 데이타 터미날이 접속을 통하여 동시에 동작될 수 있다. 다양한 기술적 내용을 논의하였으며 제안한 기본율 접속구조, 기본율 S와 T 접속 비트 프레밍 요구와 Q.931 호 제어와 새로운 구조에 필요한 회선할당 절차를 논의하였다. 연구결과 기존 ISDN 스위치에서 제안한 구조로 갱신하는데 비교적 간단한 하드웨어 추가로 될 수 있고 표준 ISDN S와 T접속은 그대로 유지된다. This paper proposes a switch access architecture for Adaptive Differential Pulse Code Modulation voice transimssion over a single international standard Inetegrated Services Digital Network, Basic Rate Interface. In this proposed architecture, data terminals with two voice terminals, three voice terminals, or four voice terminals can be operated simultaneously through the interface. Various technical topics are dicussed : the proposed Basic Rate Interface architecture. BRI S and T interface bit framing requirements and the Q.931 call control and channel assignment procedures required for the new architecture. The study results show that relatively simple additional hardware could be used to upgrade an existing ISDN switch to this proposed architecture and the standard ISDN S and T interfaces remain intact.

차세대 이동 위성서비스의 특성 분석

홍정식,안재경,김지표 한국정보사회진흥원 2005 정보화정책 Vol.12 No.4

1990대에 본격적으로 시작된 위성에 대한 연구를 바탕으로 국내에서는 무궁화 위성이 3호까지 성공적으로 운용되고 있으며, 곧 무궁화위성 5호도 발사될 예정에 있다. 현재 이러한 위성들은 통신, 방송용으로 지상망을 보완하는 역할을 수행하고 있으나, 차후 위성은 언제 어디서나 개인이 원하는 형태로 이용할 수 있는 초고속 멀티미디어 서비스를 제공할 예정이다. 본 연구에서는 미래 이동위성통신시스템의 원활한 개발을 위하여 필수적으로 수반되어야 하는 차세대 유망 위성서비스에 대한 다양한 분류작업과 지상망 대비 경쟁력 검토를 하였으며, 이를 바탕으로 양방향 HDTV, 양방향 DMB, LBS와POS, PPDR, DCD, Glass Vision, 실시간 여행/운전 안내, 자동 정보 업데이트, 산간/오지의 인터넷 등 9개의 유망 위성서비스를 도출하고 그 특성을 분석하였다. 또한 이들 서비스를 심층 분석한 결과 재난정보 서비스, 디지털 콘텐츠 분배서비스, 그리고 산간/오지 인터넷 서비스가 보다 경쟁력 있는 서비스로 드러났다.

직접 결합된 4-패치 마이크로스트립 어레이 안테나의 복사패턴에 대한 비교

洪在杓 慶一大學校 1992 論文集 Vol.8 No.1

4개의 패치가 마이크로스트립 선로로 직접 결합된 구형 마이크로스트립 어레이 안테나의 복사패턴을 이론적으로 해석하였다. 등가 전송선로 모델 및 복사 어드미턴스를 이용하여 안테나의 등가회로를 구한후, 역상 전압을 보상하여 안테나의 복사패턴을 구하였다. 그리고 이론적인 결과를 입증하기 위하여 K.L.Wu등이 제시한 실험 및 이론적인 결과와 비교 검토하였다.

유전체층을 갖는 정현형과 comb 격자구조에 대한 Off-Bragg TE blazing

홍재표,조웅희,백운석 동양대학교 2000 동양대학교 논문집 Vol.6 No.1

The analysis method for the electromagnetic scattering by sinusoidal and comb gratings covered with dielectric slab is considered for TE polarization case from the viewpoints of both reflection grating problem and leaky wave antenna problem. The analysis is based on a periodic Green's function and the method of moments. Integral equation is obtained for the currents induced on an infinite perfectly conducting grating and solved by use of the method of moments employing pulse Galerkin's scheme. Numerical results involving some combinations of geometric parameters are presented in terms of complex propagation constants and relative scattered powers of spectral modes.

씨름선수들의 경력과 체급이 경쟁상태불안에 미치는 영향

홍장표,이재학,이승도 龍仁大學校 體育科學硏究所 1998 體育科學硏究論叢 Vol.8 No.1

The purpose of this study is to analyze effects of athletic careers and weight grades on cognitive competitive state anxiety and physical competitive state anxiety. The study employed 250 university Ssirum athletes who participated in the 28th National Ssirum Championship for federation chairman's flag and the 35th National Ssirum Championship for Presidential Flag. Two hundred twenty response forms out of 250 subjects using CSAI-2 by Martens (1990) were analyzed. Descriptive statistics for mean and standard deviation for weight grades and athletic careers and one way ANOVA for differences among grades and among careers at α= .05. The conclusions are followings. First, athletic careers influenced on cognitive competitive state anxiety, physical competitive state anxiety, and state confidence, Second, weight grades did not influence on cognitive competitive state anxiety, physical competitive state anxiety, and state confidence.