• Proceedings of the KIPE Conference
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• 2016.07a
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• pp.141-142
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• 2016

전계결합을 이용한 무선전력전송 시스템은 송 수신부 사이에 형성된 링크 캐패시턴스를 사용해서 에너지를 전송한다. 이러한 용량 리액턴스를 상쇄하기 위한 방안으로 인덕터나 변압기를 응용한 여러 종류의 임피던스 정합구조가 연구되고 있다. 본 논문에서는 다양한 리액턴스 보상 방법에 대한 장 단점을 비교하고 이 중에서 전계결합 시스템에 가장 적합한 임피던스 정합구조를 선정한다.

• Proceedings of the KIEE Conference
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• 2009.04b
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• pp.21-22
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• 2009

본 논문에서는 Phase Set Shift (PSS)를 이용한 영구자석형 선형 전동기에서의 코깅력의 저감에 대해 기술한다. Phase Set Shift는 코깅력의 주기성을 이용하여 코깅력을 저감하는 방법으로 각 phase set이 갖는 코깅력을 위상차이를 주어 서로의 코깅력을 상쇄하여 총 코깅력을 저감하는 방법이다. 선형 전동기의 코깅력의 해석을 위해서 유한요소법을 이용하였으며 코깅력의 주기성에 대한 연구를 위해 푸리에 급수를 이용하였다.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.12
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• pp.270-276
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• 2013

We have been unwittingly exposed to magnetic field. Biological effects due to electromagnetic field exposure has been studied over the past several decades. There has been epidemiological studies and laboratory studies. In the case of laboratory studies, the effect has been observed through the cell stimulation of an artificial magnetic field. The used frequency and waveform are various in the cell experiment, but the intensity of the magnetic field is usually around 10G. Intensity of Earth's magnetic field is about 300-400mG. Although this intensity is not much higher than artificial magnetic field as 3-4% amplitude, we can't ignore the effect because every living thing on earth has already adapted for long time ago. In this study, we have designed and implemented the 3-axis magnetic field generation system in oder to remove the static magnetic field in the real-time and kept its intensity less than ${\pm}5mG({\pm}0.5uT)$ using 3-axis helmholtz coil.

• Analytical Science and Technology
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• v.6 no.1
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• pp.107-119
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• 1993

The purpose of this study is to investigated the elution behavior of platinoid metal acetylacetonates, which is the key to elucidate their retention mechanism and optimize their RPLC separation conditions. The retention data of four platinoid metal acetylacetonates have been measured on four different columns in methanol-water and acetonitrile-water systems. The retention of uncharged platinoid metal acetylacetonates is interpreted by solvophobic effect. The retention of platinoid metal acetylacetonates is also greatly influenced by the geometric structure of the complexes. The square planar chelates, $Pd(acac)_2$, $Pt(acac)_2$, are retained longer than the octahedral chelates, $Rh(acac)_3$, $Ir(acac)_3$. It is likely due to that square planar chelates show greater interaction with nonpolar stationary phase than octahedral chelates. The results of van't Hoff plots have shown that platinoid metal acetylacetonates is operated on the same retention mechanism in the temperature range of $25{\sim}45^{\circ}C$. The study of the retention mechanism by the enthalpy-entropy compensation phenomenon has indicated that the retention mechanism of octahedral chelates and square planar chelates do not vary with the composition change of methanol-water mobile phase, respectively. In acetonitrile-water mobile phase, however, the retention mechanism is observed to be more complicated. Optimum condition for the separation of four platinoid metal acetylacetonates is found to be 40% methanol, polymeric C18 column, and $45^{\circ}C$.

• Korean Journal of Child Studies
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• v.24 no.1
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• pp.99-108
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• 2003

This study was based on theories of the culture of poverty and the causes and consequences of poverty. The strong relationship of family income to mother's education presents the possibility of an intergenerational education cycle. Using a longitudinal approach, parental poverty status was measured by family income, welfare assistance, single parent, and occupation when children were 2 years of age; children's school performance was measured by teacher reports of their reading, mathematics, writing, and overall ability at grade 1. Data were analyzed by structure equation modeling. Results showed that mother's pre-childbearing level of education predicted child school performance in grade 1, confirming an intergenerational cycle. In addition, the results indicated that parental poverty acts as a mediator between the cycle.

• The Korean Journal of Applied Statistics
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• v.1 no.2
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• pp.61-65
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• 1987

Randomization is one of the principles that should be adopted in comparative experiments. Randomization is well known as a useful tool for averaging out the effects of external factors. It also validates statistical inference based on mathematical model. This teaching meterial is designed for the purpose of illustrating the role of randomization.

• Proceedings of the KIEE Conference
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• 2007.11a
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• pp.226-227
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• 2007

유도결합 플라즈마(ICP)에서 안테나의 특정부분에 유도자기장을 보강 또는 상쇄 시키는 형태의 두 안테나를 고안하였다. 플라즈마 밀도와 전자온도, 플라즈마 전위, 전자에너지 분포함수 등의 플라즈마 파라미터들로 그 특성을 비교하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2021.10a
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• pp.590-593
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• 2021

본 연구에서는 목발을 사용하는 교통약자가 물품을 안정적으로 휴대할 수 있도록 도와주는 장치를 개발하였다. 2축 짐벌 구조를 기반으로 서보모터, IMU센서, 아두이노 나노 마이크로프로세서로 구현하였고, Pitch와 Roll 방향 회전을 상쇄하기 위해 센서 각도를 변환 없이 사용하는 기본제어법과 PID 제어법을 사용하여 비교하였다.

• Journal of Convergence for Information Technology
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• v.7 no.5
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• pp.103-109
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• 2017

A pressure vessel is a cylindrical container that accommodates a pressurized fluid. In real life, there are propane canisters and butane canisters. According to data from the Korea Gas Safety Corporation, The number of domestic gas accidents is average 33 cases of domestic gas accidents occurred per year and 20.8 for mobile butane gases. The purpose of this study was to investigate a method to prevent this kind of explosion. Common studies include forced drain through safe holes, forced separation of butane canisters, and manufacturing of high-strength steel. This paper uses a concept that reduces stress inside the cylinder using prestressed method that precede compression. In other words, install a long liner in both ends of the pressure vessel. I want to develop a safety device that acts like a gas intermediate valve.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.20 no.1
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• pp.39-46
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• 2002

This paper shows what is point to be considered at that time in cadastral settlement surveying after declination analysis between GPS and traditional surveying at coordinate result of cadastral triangulation points and supplementary point in site selected deplaning of streets which is surveyed traditional surveying. In the case that coordinates of cadastral triangulation assistance points was decided by standard of the existing cadastral triangulation points that direction of the error vector is in opposition, authors could know all errors was reduced inside coordinate by error being offset each other through the results of study. The coordinates result of cadastral triangulation point by standard of the cadastral triangulation points reduces the deviation value through error that an intersection points was centered being offset each other but through the result that a tendency of errors occurrence is analyzed goniometrys, supplementary points that is close to cadastral triangulation assistance points was affected by error of cadastral triangulation assistance points.