• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1420-1421
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• 2011

비정질 IGZO 박막 트랜지스터에 포지티브 직류/교류 게이트 바이어스를 인가하여 신뢰성을 분석하고 비정질 IGZO 박막 트랜지스터의 신뢰성을 고려한 시프트 레지스터 회로를 설계하였다. 비정질 IGZO 박막 트랜지스터의 문턱전압은 바이어스 스트레스가 인가되었을 때 양의 방향으로 이동하였고, 전류가 감소하였다. 또한 문턱전압은 직류 바이어스 스트레스가 인가되었을 때 교류 바이어스 스트레스가 인가 되었을 때 보다 더 양의 방향으로 이동하였다. 총 8개의 박막 트랜지스터로 구성된 일반적인 시프트 레지스터 회로에서는 특정 박막 트랜지스터에 직류 바이어스 스트레스가 걸리기 때문에 비정질 IGZO 박막 트랜지스터를 이용하여 구동할 때 회로 오동작을 유발할 수 있다. 비정질 IGZO 박막 트랜지스터의 신뢰성 결과를 고려하여 총 9개의 박막 트랜지스터로 구성된 교류 동작하는 시프트 레지스터 회로를 설계하였다. 모든 소자에 직류 바이어스 스트레스가 걸리지 않도록 회로를 설계하였으며, 추가된 트랜지스터의 채널 너비가 매우 작기 때문에 트랜지스터가 하나 추가되어도 회로가 차지하는 면적에는 거의 변화가 없다. 바이어스 스트레스에 따른 소자 열화를 고려하여 시뮬레이션을 해 본 결과 일반적인 회로에서는 회로 오동작이 관측된 반면, 제안한 회로에서는 문제없이 동작하는 것을 확인하였다.

• Journal of Digital Convergence
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• v.17 no.12
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• pp.461-466
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• 2019

In this study, we found that the design can be configured according to the visual weight in the design of the interface. First of all, interface design has gone through the era of squeeze morphism to express depth and dimension by borrowing part of material design or head design from flat design. This is due to the characteristics of metro UI and flat design, which are difficult to express depth and dimension, but in material design, there was no separate device for inducing eyes, so Gestalt theory showed the principle of visual weight. Positive and negative, the size and placement of regions, proximity, closure, and notion were closely related to visual weight and orientation, and in some cases, it could be applied to the interface.

• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2000.12a
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• pp.149-152
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• 2000

A scanner is an output device that scans documents, photographs, films etc, and convert them to digital data. Especially, a film scanner is used for scanning negative/positive films. In this paper, we design step motor control part, image sensor part, and Aか converter part which are components of the scanner and use DSP for fast signal processing. We also design the interface circuits using EPLD between these peripherals and DSP. The PC interface circuits between scanner and PC are designed by using parallel port to control and transfer the scanned data from scanner to PC. For 35mm film, we design hardwares which obtain high resolution more than 9 million pixels (horizontal resolution is 3835 and vertical resolution is 2592).

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.22 no.6
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• pp.625-630
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• 2011

In this paper, spiral meander monopole printed antenna for dual band operation in GPS(1.57~1.577 GHz) and WiBro(2.3~2.4 GHz), WLAN(2.4~2.48 GHz) is proposed. Spiral(positive coupling) mounted end of monopole(small current) and meander mounted fed of monopole(big current) for reduce frequency ratio. Bandwidth(-10 dB) of the antenna is measured 130 MHz(1.49~1.62 GHz) in basic resonance frequency and 330 MHz(2.29~2.62 GHz) in harmonic resonance frequency($3{\lambda}_H/4$). The peak antenna gains are measured 2.86 dBi in GPS(1.57 GHz), and 3.49 dBi in WiBro(2.35 GHz), and 3.71 dBi in WLAN(2.44 GHz).

• Journal of the Korean Chemical Society
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• v.46 no.5
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• pp.437-471
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• 2002

The photosensitivity enhancement of photoresist achieved by the addition of acid amplifiers stems from the autocatalytic decomposition of the acid amplifiers triggered by acidic species generated from a photoacid gen-erator. In this research we synthesized and evaluated 4-hydroxy-4'-p-styrenesulfonyloxy isopropylidene dicyclohex-ane(1), 4,4'-di-p-styrenesulfonyloxy isopropylidene dicyclohexane(2) and 4-p-styrenesulfonyloxy-4'-tosyloxy isopropylidene dicyclohexane(3) as novel acid amplifiers. These acid amplifiers(1-3) showed reasonable thermal stability for resist pro-cessing temperature. As estimated by the sensitivity curve, 1-3 were 2X-12X sensitive than poly(tert-butyl meth-acrylate) film in the presence of a photoacid generator and, therefore, provides practical applicability for photoimaging.

• International Area Studies Review
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• v.12 no.3
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• pp.25-47
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• 2008

This paper tries to explore the impact of economic globalization on social capital accumulation. To investigate direct effect, we build a model and derive a proposition which can explain the relative decline in social capital brought about by market expansion. Besides direct effect, we also explore channel effect through democracy, government size, education attainment, and inequality. We estimate direct and channel effect of globalization using cross section of 65 countries data time period 1980-1999 using three-stage least squares(3SLS). Results are in line with predictions and clearly support that globalization significantly and negatively affects social capital accumulation. Channel effect also shows that globalization has a negative effect through aggravating income inequality while it has a positive effect through higher education attainment, higher level of democracy and larger government spending. Such a net negative channel effect reinforces our prediction. As a robustness check we estimate other sets of data and the result strongly supports our theory.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.45 no.1
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• pp.69-75
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• 2019

Preservatives of cosmetics is managed by positive list in Korea. Positive list requires a proper quantitative analysis method, but the analysis method is still insufficient. In this study, gas chromatography with flame ionization detector was used to simultaneously analyze 14 preservatives in cosmetics. As a result of method validation, the specificity was confirmed by the calibration curves of 14 preservatives showing good linearity correlation coefficient of above 0.9997 except dehydroacetic acid (0.9891). The limits of detection (LOD) and quantification (LOQ) of 14 preservatives were 0.0001 mg/mL ~ 0.0039 mg/mL and 0.0003 mg/mL ~ 0.0118 mg/mL, respectively, but they were 0.0204 mg/mL, 0.0617 mg/mL for dehydroacetic acid, respectively. The precision (Repeatability) of the values was less than 1.0%, but 7.1% for dehydroacetic acid. The Accuracy (% recovery) of 14 preservatives in cosmetics showed 96.9% ~ 109.2%. Finally, this method was applied to 50 cosmetics available in market. Results showed that the commonly used preservatives were chlorophene, phenoxyethanol, benzyl alcohol and parabens. However, the amount of the detected preservatives was within maximum allowed limits established by KFDA.

• Journal of the Korean Chemical Society
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• v.54 no.5
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• pp.523-532
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• 2010

The proposed method is simple, sensitive and specific Liquid chromatography-tandem mass spectrometry (LCESI-MS/MS) method for the quantification of Entacapone (EA) in human plasma using Entacapone-d10 (EAD10) as an internal standard (IS). Chromatographic separation was performed on Zorbax SB-C18, $2.1{\times}50\;mm$, $5\;{\mu}m$ column, mobile phase composed of 10 mM Ammonium formate (pH 3.0): Acetonitrile (60:40 v/v), with a flow-rate of 0.7 mL/min, followed by Liquid-liquid extraction. EA and EAD10 were detected with proton adducts at m/z $306.1{\rightarrow}233.1$ and $316.3{\rightarrow}233.0$ in multiple reaction monitoring (MRM) positive mode respectively. The method was validated over a linear concentration range of 1.00 - 2000.00 ng/mL with correlation coefficient ($r^2$) $\geq$ 0.9993. Intra and inter-day Precision within 3.60 to 7.30 and 4.20 to 5.50% and Accuracy within 97.30 to 104.20 and 98.30 to 105.80% proved for EA. This method is successfully applied in the bioequivalence study of healthy Indian human volunteers.

• Journal of the Korean Society of Floral Art and Design
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• no.40
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• pp.97-123
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• 2019

The purpose of this study is to analyze the spatial characteristics of the unit of garden and to classify and symbolize it, to provide the basis for analyzing the works based on the characteristics of the space and to provide the data that can become the logical foundation for garden design. The research method first analyzed the behavioral scene analysis and the grounded theory methodology as the theory about the space type. It controls the subjectivity of the researcher and derives the characteristics of the space for the garden image based on the experiential knowledge of the expert, It is a qualitative analysis method that aims to increase credibility. The actual case target was the author garden which was exhibited at the 2017 Seoul Garden Expo. Through this process, we have simplified the characteristics of the space and the positives and negatives accordingly. We have grasped the relationship between spatial space, sculptural space, architectural space, and environmental space.. Research on qualitative topics such as the characteristics of space can not completely exclude the subjectivity of the researcher in terms of its characteristics, but such research can provide a rationale for interpreting and evaluating the gardens that depend on the individual's taste.. It can also contribute to the development of the field by providing reference materials for garden designs that rely on designer intuition, or by providing a logical basis for design.

• Journal of Venture Innovation
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• v.5 no.4
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• pp.179-189
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• 2022

In the face of revolutionary changes in industry, the relationship between labor and income needs to be reconceptualized in the period of social revolution. The absolute decrease in labor due to the absence of labor is caused by automation, smartization, AI, robot labor, etc., which we must accept whether we want to or not. However, while gross social product and capital of the state or society increase, individual income is likely to decrease. During this transformation period, the state or politics must prepare for the problems caused by the decline in individual income. Until now, there have been various levels of discussion on social welfare or social security from the perspective of welfare or assistance. Attempts or studies at the experimental level have been conducted at the level of many countries or local governments and have found positive and negative effects. There is no basic income system that is widely implemented at the national level, and various discussions are taking place from a future-oriented perspective. Therefore, I propose to look at it from a new perspective based on the perspective so far. We explored that it is part of a positive approach to examine the importance and necessity of basic income in terms of working hours, quality of labor, income, quality of life, value of spare time, and work-life balance. The goal is to actively accept the absolute lack of working hours, replacement of mechanical labor, and polarization due to changes in the industry paradigm, and to look at the problems that come from a positive perspective. If we are going to accept it anyway, we should not look at these issues as short-sighted, but prepare them preemptively and establish a primitive plan from a long-term and overall perspective. Smartphones have changed the world over the past decade and have been lost, but wouldn't there be a lot of new discoveries? Shouldn't we think of it as a great opportunity to improve the quality of life through technological changes?