• 한국마린엔지니어링학회:학술대회논문집
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• 한국마린엔지니어링학회 2001년도 춘계학술대회 논문집
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• pp.207-212
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• 2001

In this paper, a method to be able to decide the possible maximum gain of P, PI control for the retarded processes under stable condition is proposed. At first, adjustable parameter set causing stability limit are obtained based on the frequency domain condition which makes the roots of transfer function locate on the $j\omega$ axis. And the cut-in frequency $\omega{_p}$ to bring the parameter set to P control from PI control is derived by an equation with 2 parameters L and $T_m$ given, then $\omega{_p}$ is used to compute the maximum gain with stable condition. For the calculation, the controlled process of first order system with time delay element is introduced and all parameters are presumed to be time invariant.

• 대한전자공학회논문지
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• 제13권6호
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• pp.7-11
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• 1976

연산증폭기를 이용한 전압안정부저항회로를 제안하였으며, 전입력전압범위에 걸쳐서 회로를 해석하였다. 부저항영역에서 이 v-i특성이 2가지 구분된 요인에 의해서 이루어짐을 밝혔고, 이 개념에 의해서 역 v-i특성의 꼭지점을 해석하였다. 제안된 회로를 실험하여 얻은 입력 v-i특성의 직선성은 대단히 양호하였으며, 이들의 부저항치는 전압범위 ±1∼±5V에서 -86∼833Ω였다. 그리고 전입력전압범위에서 v-i특성을 검토했다. A voltage-stable negative resistance circuit with operational amplifier is proposed, and circuit analysis is given all the input voltage range. The behavior of the v-i characteristics in the nogative resistance region is devided into two causes, and top points in the input v-i characteristics of the circuit is analyzed with them. Experimental results of the v-i characteristics of the proposed circuit has a good linearity in the negative region with negative resistance, -86Ω∼-833Ω for the input voltage, ± 1∼± 5 colts. The v-i characteristics of the circuit in all the input voltage range is discussed.

• 한국멀티미디어학회논문지
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• 제13권1호
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• pp.38-46
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• 2010

P2P온라인 게임 시스템에서 대규모 사용자의 동시 접속을 수용할 수 있는 안전한 게임 운영 시스템이 필수적이다. 본 논문에서 제안하는 P2P 온라인 게임 시스템은 RS(Region Sever)들의 재구성 및 RS간의 숭호 정보 교환을 통해 한 영역에 플레이어가 집중되는 현상을 피하여 대규모 플레이어를 수용할 수 있으며, 안전한 게임을 운영할 수 있다. 또한 모니터링 서버의 광역 버퍼(Global Zone Buffer)를 이용한 부하분산으로 타임스탬프 시간 내의 게임 동기화가 가능하며고 미들웨어를 단위 영역별로 관리하여 게임 월드의 크기에 관계없이 수행 가능하다. 따라서, 서버 추가 문제의 해결 및 메시지 전송의 안정성을 확보할 수 있다. 또한, 시뮬레이션을 통하여 제안 시스템에 대한 효율성을 입증한다.

• 한국멀티미디어학회논문지
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• 제12권3호
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• pp.345-353
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• 2009

P2P 온라인 게임 시스템에서 대규모 사용자의 동시 접속을 수용할 수 있는 안전한 게임 운영 시스템이 필수적이다. 본 논문에서 제안하는 P2P 온라인 게임 시스템은 RS(Region Server)들의 재구성 및 RS간의 상호 정보 교환을 통해 한 영역에 플레이어가 집중되는 현상을 피하여 대규모 플레이어를 수용할 수 있으며, 안전한 게임을 운영할 수 있다. 또한 모니터링 서버의 광역 버퍼(Global Zone Buffer)를 이용한 부하분산으로 타임스탬프 시간 내의 게임 동기화가 가능하며, 미들웨어를 단위 영역별로 관리하여 게임 월드의 크기에 관계없이 수행 가능하다. 따라서, 고비용의 서버 추가 문제 및 메시지 전송의 안정성을 확보할 수 있다. 또한, 시뮬레이션을 통하여 제안 시스템에 대한 효율성을 입증한다.

• 지역연구
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• 제15권1호
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• pp.63-73
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• 1999

It is generally believed that there is a trade-off between economic growth and environmental quality since pollutants are generated in the process of production and consumption of commodities. Several researchers have shown this prevailing belief using the short-term input-output models. The literature, however, shows that there have been few attempts to investigate the relationship using long-term forecasting models. This motivates the current paper. This paper attempts to build a reginal growth model in a partial equilibrium framework taking into consideration the requirements of capital invested for pollutant abatement. Model is largely neoclassical. Labor is assumed to move a region with high utility specified in regional per capita average was income and pollution level while capital is partially mobile to a region with high returns. The regional growth is explored in a phase diagram. The paper shows that there are two stable growth equilibria which a region can converge over time and that the equilibria are distinguished by the initial threshold capital stock that a region holds. If the initial capital stock of a region is over(under) than the threshold size, the region converges to the higher (lower) growth equilibrium over time. Moreover, based on this result an environmental quality enhancing policy is analyzed in the phase diagram. It has revealed that the policy calls for the relocation of growth equilibrium points, specifically speaking, it stimulates an increase in labor stock and a decrease in capital stock. Hence the paper has suggested that the prevailing belief which the environmental policy negatively impacts on a regional economic growth is not always true.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2010년도 추계학술대회 논문집
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• pp.1001-1002
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• 2010

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2010년도 추계학술대회 논문집
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• pp.203-204
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• 2010

• 한국동물학회:학술대회논문집
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• 한국동물학회 1999년도 한국생물과학협회 학술발표대회
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• pp.290.2-290
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• 1999

No Abstract, See Full Text

• 로봇학회논문지
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• 제6권4호
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• pp.301-307
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• 2011

Based on the stability criteria of ZMP (Zero Moment Point), this paper proposes an adjusting algorithm that modifies walking trajectory of a bipedal robot for stable walking by analyzing ZMP trajectory of it. In order to maintain walking balance of the bipedal robot, ZMP should be located within a supporting polygon that is determined by the foot supporting area with stability margin. Initially tilting imposed to the trajectory of the upper body is proposed to transfer ZMP of the given walking trajectory into the stable region for the minimum stability. A neural network method is also proposed for the stable walking trajectory of the biped robot. It uses backpropagation learning with angles and angular velocities of all joints with tilting to get the improved walking trajectory. By applying the optimized walking trajectory that is obtained with the neural network model, the ZMP trajectory of the bipedal robot is certainly located within a stable area of the supporting polygon. Experimental results show that the optimally learned trajectory with neural network gives more stability even though the tilting of the pelvic joint has a great role for walking stability.

• 한국환경과학회지
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• 제10권5호
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• pp.329-336
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• 2001

Characgcteristics of nocturnal boundary layer(NBL) were analyzed by the upper-air observations data using with the airsonde and pilot balloons from 1994 to 1999 in Kyungpook province. The automate weather boundary layer can become stably stratified when the surface is cooler than the air. Stable nocturnal boundary layer height were estimated from the top of surface stable layer where the vertical gradient of temperature and mixing ratio tend to zero or negative. The depth of the stable nocturnal boundary layer depended largely on the thermal effect rather than the wind effect at nighttime. The NBL was more developed on the land than on the coastal region. The stability index (bulk Richardson number) showed that the NBL was stable when the wind was weak and the vertical gradient of the temperature was strong. The heat budget in the NBL was studied by considering the effect of the radiative and the cooled by both the longwave radiative flux and the divergence of the heat flux, while NBL under the cloudy sky the longwave radiative flux played a role of the warming. It was noted that the heat was not conserved in both cases. To complete the heat budget in the NBL the warming/cooling by advection and subsidence must be considered.