• Korean journal of applied entomology
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• v.18 no.4 s.41
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• pp.149-152
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• 1979

The relative toxicity of some of the insecticides which have been used for the control of paddy rice insect pests in Korea was evaluated in the laboratory with the brown planthopper (BPH) Nilaparvata lugens, and a predaceous paddy spider Pirata subpiraticus. In order of the relative toxicity (LD5O value to spider/LD50 value to BPH) were PAP (0.4), MPP(0.1), MEP(1.8), diazinon(2.8), carbofuran(7.5), NAC(11.3), BPMC(17.5), Pyridaphenthion(35.9) and MIPC(65.7). MIPC and Pyridaphenthion were considered as having the desirable selective toxicity for the spider and the BPH.

• Journal of Power Electronics
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• v.11 no.2
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• pp.218-227
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• 2011

The subject of variable step size maximum power point tracking (MPPT) algorithms has been addressed in the literature. However, most of the addressed algorithms tune the variable step size according to two variables: the photovoltaic (PV) array voltage ($V_{PV}$) and the PV array current ($I_{PV}$). Therefore, both the PV array current and voltage have to be measured. Recently, maximum power point trackers that arc based on a single variable ($I_{PV}$ or $V_{PV}$) have received a great deal of attention due to their simplicity and ease of implementation, when compared to other tracking techniques. In this paper, two methods have been proposed to design a variable step size MPPT algorithm using only a single current sensor for stand-alone battery storage PV systems. These methods utilize only the relationship between the PV array measured current and the converter duty cycle (D) to automatically adapt the step change in the duty cycle to reach the maximum power point (MPP) of the PV array. Detailed analyses and flowcharts of the proposed methods are included. Moreover, a comparison has been made between the proposed methods to investigate their performance in the transient and steady states. Finally, experimental results with field programmable gate arrays (FPGAs) are presented to verify the performance of the proposed methods.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.1278-1280
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• 2011

인터넷 쇼핑몰을 통하여 사용자들은 다양한 상품의 구입과 유통정보시스템의 구축으로 복합적이고, 차별화된 전략을 통해 소비패턴의 큰 변화를 가져왔다. 이러한 추세는 대형마트를 중심으로 확산되었고, 대형마트를 선호하고 구매력을 향상시키는 요인이 되었으며, 경제성장과 소득수준의 향상으로 사용자들의 욕구 또한 고급화되고 다양화되는데 큰 영향을 끼치고 있다. 이로 인하여 인터넷에서 처리되는 정보의 종류가 점차 확대되고 다양화되면서 정보를 처리하기 위한 구현기법도 복잡해지고 있으며, 웹사이트들은 단순히 정보제공 차원을 넘어서고 있다. 이에 따라 사용자들은 동적인 정보제공, 보안기능, 통계처리들의 기능도 요구하고 있다. 이러한 요구를 수용하기 위해서는 웹 자원을 효율적으로 관리하기 위한 시스템이 필요하다. 이러한 이유로 현재 대형마트별로 홈페이지가 구축되어 있어 사용자들이 원하는 생필품을 검색할 수 있으나, 어느 특정지역을 대상으로 통합하여 검색할 수 있는 시스템은 없는 상황이다. 본 논문에서는 D 지역의 대형마트를 선정하여 사용자들이 주로 이용하는 생필품들의 가격을 조사하여 상품에 대한 가격을 웹상에서 보다 쉽게 비교하여 검색할 수 있도록 MPP(Mart Products Price) 통합 검색 시스템을 구현하였다.

• Proceedings of the KIPE Conference
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• 2011.07a
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• pp.275-276
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• 2011

본 논문에서는 일사량 및 표면온도에 따라 변화하는 태양전지의 출력 특성을 고려하여 설치되는 태양광 발전 인버터의 운전 허용 범위에 대해 살펴본다. 또한 대용량 발전 시 직렬 모듈 수를 높이는 구성과 기존 센트럴 인버터의 최소 MPP 전압의 증가에 대한 효율성을 검증하기 위해 (주)카코 뉴에너지에서 제공하는 PV Array Sizing Tool과 Matlab Simulink를 통해 태양전지 어레이의 동작 범위를 파악하고, 새로운 대용량 인버터 개발 원리의 타당성을 제시한다.

• Journal of the Korean Institute of Telematics and Electronics D
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• v.36D no.10
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• pp.37-44
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• 1999

This paper report the implementation results of Monte Carlo numerical calculation for ion distributions in plasma dry etching chamber and of the surface evolution simulator using cell removal method for topographical evolution of the surface exposed to etching ion. The energy and angular distributions of ion across the plasma sheath were calculated by MC(Monte Carlo) algorithm. High performance MPP(Massively Parallel Processing) algorithm developed in this paper enables efficient parallel and distributed simulation with an efficiency of more than 95% and speedup of 16 with 16 processors. Parallelization of surface evolution simulator based on cell removal method reduces simulation time dramatically to 15 minutes and increases capability of simulation required enormous memory size of 600Mb.

• Journal of the Institute of Electronics and Information Engineers
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• v.52 no.12
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• pp.134-141
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• 2015

The purpose on this research is quantitatively comparing and analyzing signal intensity of 1.0mol and 0.5mol contrast agent. For this study, two MR phantoms were produced. One of them is used with 1.0mol Gadobutrol. The other is used with 0.5mol Gadoteridol. These two phantoms respectively have been scanned by SE T1 sequence which is used to get a general contrast-enhanced image in 1.5T MRI and 3D FLASH sequence which is used as enhanced angio MRI. Signal intensity was measured by scanned images as per contrast agent dilution ratio. The results were as follow: RSP(Reaction Starting Point) of the two sequences(2D SE, 3D FLASH) was respectively 6.0%, 60.0% in 0.5mol contrast and 2.0%, 20.0% in 1.0mol contrast, which means in 0.5mol contrast, RSP was formed faster than the one in 1.0mol contrast. MPSI was respectively 1358.8[a.u], 1573[a.u] in 0.5mol contrast and 1374[a.u], 1642.4[a.u] in 1.0mol contrast, which means 0.5mol contrast's MPP (0.4%, 10.0%) was formed faster than 1.0mol contrast's MPP (0.16%, 1.8%). Lastly, RA as per contrast agent dilution ratio was 27.4%, 11.8% wider in 0.5mol contrast(20747.4[a.u], 23204.6[a.u]) than in 1.0mol contrast(12691.9[a.u], 20747.4[a.u]). According to the study, we are able to assure that signal reaction time of 1.0mol contrast is slower than the one of 0.5mol contrast in contrast-enhanced MRI at two different sequences(2D SE, 3D FLASH). Furthermore, owing to the fact that there are not any signal intensity differences between 1.0mol and 0.5mol contrast, it is not true that high concentration gadolinium MR contrast agent does not always mean high signal intensity in MRI.

• 제어로봇시스템학회:학술대회논문집
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• 2005.06a
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• pp.1183-1188
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• 2005

In this paper, we propose a 3D automated measuring system which measures the mandibular movements and the reference plane of the jaw movements. In diagnosis and treatment of the malocclusions, it is necessary to estimate the mandibular movements and the reference plane of the jaw movements. The proposed system is configured with double stereo-cameras, PC, two moving pattern plates(MPPs), two fixed pattern plates(FPPs) and one orbital marker. The virtual pattern plate is applied to calculate the homogeneous transformation matrices which describe the coordinates systems of the FPP and MPP with respect to the world coordinates system. To estimate the parameters of the hinge axis, the Euler's theorem is applied. The hinge axis points are intersections between the FPPs and the hinge axis. The coordinates of a hinge axis point with respect to the MPP coordinates system are set up to fixed value. And then, the paths of the jaw movement can be calculated by applying the homogeneous transformation matrix to fixed hinge axis point. To examine the accuracy of the measurements, experiments of measuring the hinge axis points and floating paths of them are performed using the jaw motion simulator. As results, the measurement errors of the hinge axis points are within reasonable boundary, and the floating paths are very similar to the simulator's moving path.

• Proceedings of the KIPE Conference
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• 2003.07a
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• pp.204-207
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• 2003

PV model is presented based on the shockley diode equation. The simple model has a photo-current source, an single diode junction and a series resistance and includes temperature dependences. An accurate PV module electrical model is presented, matching with boost converter MPPT strategy and demonstrated in Matlab for a typical general purpose solar cell. Given solar insolation and temperature, the model returns current vector and MPP.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1396-1397
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• 2011

The world has problem of petrifaction energy exhaustion and environment pollution. We are looking up various solution plans regarding this problem. Solar power is one of the solution to solve the energy shortage problem. But solar power is affected by insolation. So we study tracking solar power system for the generation of electricity more. In this paper, we compared fixed solar power system with horizontal and vertical tracking solar power system. Two method were on he Maximum Power Point(MPP) using Solar pro.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1394-1395
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• 2011

Now a days has problem of energy resource shortage and environmental pollution. We are looking up various solution plans regarding this problem. Solar power is one of the solution to solve the energy shortage problem. But solar power is affected by the weather. So variation weather we can use Maximum Power Point Tracing device for solar PV system. In this paper, New MPPT method is proposed to tracking MPP at low and high insolation by combining constant voltage method with Newton Method method.