• KDI Journal of Economic Policy
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• 제34권3호
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• pp.1-29
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• 2012

본 연구에서는 혁신도시지역과 그 주변지역의 지가 데이터를 바탕으로 혁신도시사업에 따라 토지가격이 어느 시점부터 어느 정도 변동했는지 살펴보았고, 이를 통해 현행 제도가 개발이익의 배제원칙에 잘 부합하지 않음을 밝히는 한편, 현행 제도를 개발이익의 배제원칙에 보다 부합하도록 개선하기 위한 방안들을 모색하였다. 우선 혁신도시지역과 그 주변지역의 지가 데이터를 분석해 보면, 대부분의 혁신도시지역의 지가가 2005년부터 그 주변지역들에 비해 통계적으로 유의하게 상승하기 시작하였음을 알 수 있다. 즉, 이 시기부터 혁신도시사업과 관련한 정보가 지가에 반영되기 시작하였다고 볼 수 있는데, 이와 같이 혁신도시사업 관련 정보가 반영된 지가를 바탕으로 실제 보상액을 산정하면 개발이익의 배제원칙과는 괴리가 생기게 된다. 그러나 토지보상법 제70조에 따른 보상액 산정의 기준지가는 2007년 1월 1일 공시된 공시지가이며, 또한 실제로도 이러한 기준을 적용하여 보상이 진행되었다. 즉, 2005년부터 2006년 말까지 개발 정보가 해당 혁신도시 지가에 반영되었음에도 불구하고 이를 배제하기 위한 제도적 장치 및 노력 없이 보상이 진행되었다. 이러한 문제들을 해결하기 위해 본 연구에서는 크게 두 가지 방안을 제안하고 있다. 첫째, 토지보상법 제70조 제5항에서 소급적용할 수 있는 공시지가의 한계를 두지 말고, 대신 개발이익이 반영되지 않았다고 판단되는 가장 최근의 공시지가를 기준시가로 적용하도록 변경하는 것이 필요하다고 판단된다. 이렇게 정해진 기준시가를 바탕으로 가격인정시점까지의 통상적인 평균 물가상승률, 평균 지가상승률 등을 바탕으로 보상액을 보정한다면 개발이익 배제의 원칙에 보다 부합할 것이다. 둘째, 개발이익이 지가에 반영되었다고 판단하는 기준을 하위 법령에 명시적으로 포함시킬 필요가 있다. 현행 제도하에서는 수용보상액 산정 시 개발이익 반영 여부에 대한 평가자의 자의적인 해석이 포함될 가능성이 크다. 따라서 본 연구에서의 학술적 연구 결과와 현행 토지보상평가지침(감정평가협회) 등의 기준 등을 참고하여 개발이익 반영 여부를 판단하는 기준을 개선할 필요가 있다.

• Journal of Power Electronics
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• 제13권5호
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• pp.829-840
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• 2013

The modified sinusoidal pulse-width modulation (SPWM) is one of the PWM techniques used in three-phase AC-DC buck converters. The modified SPWM works without the current sensor (the converter is current sensorless), improves production of sinusoidal AC current, enables obtainment of near-unity power factor, and controls output voltage through modulation gain (ranging from 0 to 1). The main problem of the modified SPWM is the huge starting current and voltage (during transient) that results from a large step change from the reference voltage. When the load changes, the output voltage significantly drops (through switching losses and non-ideal converter elements). The single-input single-output (SISO) approach with minor-loop voltage feedback controller presented here overcomes this problem. This approach is created on a theoretical linear model and verified by discrete-model simulation on MATLAB/Simulink. The capability and effectiveness of the SISO approach in compensating start-up current/voltage and in achieving zero steady-state error were tested for transient cases with step-changed load and step-changed reference voltage for linear and non-linear loads. Tests were done to analyze the transient performance against various controller gains. An experiment prototype was also developed for verification.

• 전자공학회논문지SC
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• 제46권2호
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• pp.1-6
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• 2009

금속 산화막 반도체 전계효과 트랜지스터(MOSFET)와 트랜지스터(Transistor)와 접합형으로 구성된 절연 게이트 양극성 트랜지스터(IGBT)의 게이트바이어스 상태에서 감마방사선을 조사하면 전기적특성에서 문턱전압과 전류이득의 감소가 발생한다. 저선량과 고선량에서 문턱전압의 이동은 전류의 증감에 따라 변화한다. 본 논문에서 콜렉터전류는 게이트와 에미터간의 전압으로 구동되는데 게이트 바이어스 전압과 조사량에 따라 실험하고 전기적 특성을 분석한다. 그리고 IGBT를 설계하는데 필요한 모델파라미터를 구하고 연구하는데 있다.

• 한국정밀공학회지
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• 제13권6호
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• pp.102-113
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• 1996

An experimental and theoretical study on a pneumatic servo system has been conducted using on-off valves and a pneumatic cylinder. A V/I converter has been designed for rapid rising and falling of the solenoid current, which significantly improves the positioning accuracy and settling time of the servo system by shortening the valve opening time. Pulse width modulation was modified to operate on-off valves effectively. A state feedback controller which feeds back position, velocity and acceleration is used to control the system. The influence of controller gains on the system performance is studied to develop a scheme that automatically adjusts the gains using fuzzy logic theory. It is shown experimentally that the proposed fuzzy logic tuner works satisfactorily. A new method for measurements of valve effective areas is proposed, and a partially polytropic model is applied to simulation of the pneumatic system. Simulated results show good agreement with experimental data.

• Asia Marketing Journal
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• 제18권3호
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• pp.47-63
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• 2016

Rational choice theory holds that the alternative with largest expected utility in the choice set should always be chosen. However, it is often observed that an alternative with the largest expected utility is not always chosen while the choice task itself being avoided. Such a choice phenomenon cannot be explained by the traditional expected utility maximization principle. The current study posits shows that such a phenomenon can be attributed to the gap between the expected perceived gain (or loss) and the expected perceived value. This study mathematically analyses the relationship between the expectation of an alternative's gains or losses over the reference point and its expected value, when the perceived gains or losses follow continuous probability distributions. The proposed expected value (EV) function can explain the effects of loss aversion and uncertainty on the evaluation of an alternative based on the prospect theory value function. The proposed function reveals why the expected gain of an alternative should exceed some positive threshold in order for the alternative to be chosen. The model also explains why none of the two equally or similarly attractive options is chosen when they are presented together, but either of them is chosen when presented alone. The EV function and EG-EV curve can extract and visualize the core tenets of the prospect theory more clearly than the value function itself.

• Animal Bioscience
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• 제37권5호
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• pp.839-851
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• 2024

Objective: The main goal of our current study was to improve the growth curve of meat animals by decreasing the birth weight while achieving a finishing weight that is the same as that before selection but at younger age. Methods: Random regression model was developed to derive various selection indices to achieve desired gains in body weight at target time points throughout the fattening process. We considered absolute and proportional gains at specific ages (in weeks) and for various stages (i.e., early, middle, late) during the fattening process. Results: The point gain index was particularly easy to use because breeders can assign a specific age (in weeks) as a time point and model either the actual weight gain desired or a scaled percentage gain in body weight. Conclusion: The point gain index we developed can achieve the desired weight gain at any given postnatal week of the growing process and is an easy-to-use and practical option for improving the growth curve.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제5B권2호
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• pp.189-195
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• 2005

This paper presents a new velocity estimation strategy for a non-salient permanent magnet synchronous motor drive without high frequency signal injection or special PWM pattern. This approach is based on the d-axis current regulator output voltage of the drive system, which contains the rotor position error information. The rotor velocity can be estimated through a rotor position tracking PI controller that controls the position error at zero. For zero and low speed operation, the PI gain of the rotor position tracking controller has a variable structure according to the estimated rotor velocity. Then, at zero speed, the rotor position and velocity have sluggish dynamics because the varying gains are very low in this region. In order to boost the bandwidth of the PI controller during zero speed, the loop recovery technique is applied to the control system. The PI tuning formulas are also derived by analyzing this control system by frequency domain specifications such as phase margin and bandwidth assignment.

• Transactions on Electrical and Electronic Materials
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• 제9권6호
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• pp.260-264
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• 2008

The operational characteristics of superconducting amplifier using vortex flux flow were analyzed from an equivalent circuit in which its current-voltage characteristics for the vortex motion in YBCO microbridge were reflected. For the analysis of operation as an amplifier, dc bias operational point for the superconducting amplifier is determined and then ac operational characteristics for the designed superconducting amplifier were investigated. The variation of transresistance, which describes the operational characteristics of superconducting amplifier, was estimated with respect to conditions of dc bias. The current and the voltage gains, which can be derived from the circuit for small signal analysis, were calculated at each operational point and compared with the results obtained from the numerical analysis for the small signal circuit. From our paper, the characteristics of amplification for superconducting flux flow transistor (SFFT) could be confirmed. The development of the superconducting amplifier applicable to various devices is expected.

• 대한전기학회논문지
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• 제40권8호
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• pp.757-764
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• 1991

This paper proposes a novel control method of voltage type current-controlled reactive/harmonic compensator. The proposed method does not rely on the explicit computation of load power, but indirectly controls the compensation current by regulating dc link voltage of the converter. It is shown that the system can be modeled as a simple linear system that facilitates an analytical approach to the system characteristics. With the model, the effects of the controller gains on the dynamic and steady state response of the system are investigated. Experimental results show that the proposed control method works well in spite of the simplicity of control circuitry.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 추계학술대회 논문집 전력기술부문
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• pp.144-147
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• 2006

A proportional intergral (PI) control strategy is commonly used for constant current and extinction angle control in a HVDC (High Voltage Direct Current) system. A PI control strategy is based on a stactic design where the gains of a PI controller are fixed. Since the response of a HVDC plant dynamically changes with variations in the operation point a PI controller performance is far from optimum. The contribution of this paper is the presentation of the design of a rough set based, fuzzy adaptive control scheme. Experimental results that compare the performance of the adaptive control and PI control schemes are also given.