• 한국전기전자재료학회논문지
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• 제26권4호
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• pp.278-283
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• 2013

This paper presents a design and fabrication of 0.5 V two stage operational amplifier. The proposed operational amplifier utilizes body-driven differential input stage and self-cascode current mirror structure. Cadence Virtuoso is used for layout and the layout data is verified by LVS through Mentor Calibre. The proposed two stage operational amplifier is fabricated using $0.13{\mu}m$ CMOS process and operation at 0.5 V is confirmed. Measured low frequency small signal gain of operational amplifier is 50 dB, power consumption is $29{\mu}W$ and chip area is $75{\mu}m{\times}90{\mu}m$.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권3호
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• pp.1785-1801
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• 2017

In recent years, image encryption algorithms have been developed rapidly in order to ensure the security of image transmission. With the assistance of our previous work, this paper proposes a novel chaotic image encryption algorithm based on self-adaptive model and feedback mechanism to enhance the security and improve the efficiency. Different from other existing methods where the permutation is performed by the self-adaptive model, the initial values of iteration are generated in a novel way to make the distribution of initial values more uniform. Unlike the other schemes which is on the strength of the feedback mechanism in the stage of diffusion, the piecewise linear chaotic map is first introduced to produce the intermediate values for the sake of resisting the differential attack. The security and efficiency analysis has been performed. We measure our scheme through comprehensive simulations, considering key sensitivity, key space, encryption speed, and resistance to common attacks, especially differential attack.

• 자연과학논문집
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• 제11권1호
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• pp.95-98
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• 1999

$CO_2$ gas 처리가 배추 자가불화합성 타파에 미치는 영향을 조사하고자 배추 inbred line의 암술에서 mRNA를 분리하여 DD-PCR을 수행하였다. $CO_2$ gas를 처리한 암술에서 분리한 mRNA와 처리하지 않은 꽃에서 분리한 암술 mRNA 발현과의 특이적인 차이를 DD-PCR로 조사한 결과 세 가지 각기 다른 anchor primer에 대해 모두 18개의 특이적 증폭 DNA fragment를 얻을 수 있었다. 이 결과로 미루어 보아 $CO_2$ gas 처리에 의한 암술 mRNA발현의 변화가 배추 자가불화합성 타파에 영향을 미치는 것으로 생각된다.

• 한국학교보건학회지
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• 제14권2호
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• pp.249-268
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• 2001

This study was carried out to identify the effects of an art therapy program based on reality therapy on the weight control, body image, and self-esteem of college students. The program was developed by the authors. The design was a pretest-post test control group design. The subjects were college students attending M college : 8 in experimental group A, 6 in experimental group 2, who wanted to control their body weight and 16 in the control group who didn't attend the program those in the experimental group attended the program once (group A) or twice (group B) per week meeting a total of six times. The data were analyzed by quantity method (SPSS 10.0 program) and quality method(process analysis). The results were as follows : 1. The average obesity index of pre-test, post-test, and a follow-up test decreased from 8.9% to 6.1%, 3.7%. And the rate of decrease both pre-post and post-follow up were statistically significant 2. The average obesity index of group A decreased from 9.6% to 6.3%, 4.1% and the rate of decrease between pre and post were statistically significant. But the rate of decrease between post and follow-up were statistically not significant 3. The average obesity index of group B decreased from 7.8% to 5.8%, 3.1% and the rate of decrease between pre and post were not significant statistically. But the rate of decrease between post and follow-up were statistically significant 4. The average scores of pre and post body image increased and were statistically significant : group A from 129.0 to 153.5, group B from 127.7 to 155.2. 5. The average scores of pre and post semantic differential method increased and were statistically significant: group A from 38.1 to 44.1, group B from 38.0 to 45.0. 6. The average scores of pre and post self-esteem increased: group A increased from 37.3 to 40.3 and were statistically significant, group B increased from 36.5 to 39.5 but was statistically insignificant 7. The average scores of pre and post obesity rate, body image, semantic differential method and self-esteem in the control group were not statistically significant 8. The pre and post scores of body image(p=.001), semantic differential method(p=.001) and self-esteem(p=.039) between experimental and control group were statistically significant. 9. In Duncan multiple comparison, it was not statistically significant between group A and B, but statistically significant between group A and the control group, group B and the control group in obesity index, body image, semantic differential method. There was no statistically significance among the three groups in self esteem 10. In Duncan multiple comparison, group A gained higher scores than group B in obesity index(-1.2%), and self esteem(0. 3). Group B gained higher scores than group A in body image(3. 0), and semantic differential method(1. 0). So it is difficult to conclude whether group A or B is more effective. In conclusion, the art therapy program based on reality therapy was effective in weight the control program of college students: obesity was decreased, the scores of body image and semantic differential method and self-esteem were increased. The scores of group A were increased more than group Band were statistically significant, The time interval was a very important factor in this program. The recommendation is : the validity of this program has to be tested through various subjects and in various areas. And also this program has to be tested in other topics.

• 한국지반신소재학회논문집
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• 제8권4호
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• pp.9-17
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• 2009

본 연구는 폐기물 매립지에서 폐기물의 분해 등으로 인해 부등침하가 발생할 경우 SRSL(Self Recovering Sustainable Liner)를 활용한 매립지 최종복토층의 안정성에 미치는 영향을 확인해보는 것을 목적으로 한다. FLAC(Fast Lagrangian Analysis of Continua) 2D 프로그램을 이용하여 폐기물 분해 양상을 빈칸(blank)으로 설정한 후 수치해석을 수행하였으며, 기본 물성치시험 및 문헌조사 등을 통해 각 층에 대한 구성성분의 변수를 산정하였다. 이전 현장투수시험 등을 통해 얻어진 파괴 시 안전균열폭(6mm)을 바탕으로 부등침하 발생 시 부등침하의 폭, 깊이, 개수별 매립지 최종복토층의 침하량을 산정하여 부등침하에 대한 구조적 안정성을 검토하였다. 해석결과, 깊이에 따른 영향은 없으며, 침하갯수가 증가할수록 오히려 매립지 최종복토층에 인장력을 발휘하여 안정성 확보를 유리하게 하며, 부등침하의 폭이 전체길이에 24.5% 이내일 경우 안정성에는 문제가 없는 것을 확인하였다.

• 대한수학회보
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• 제52권1호
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• pp.183-200
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• 2015

In this paper, we define the directional associated curve and the self-associated curve of a null curve in Minkowski 3-space. We study the properties and relations between the null curve, its directional associated curve and its self-associated curve. At the same time, by solving certain differential equations, we get the explicit representations of some null curves.

• 한국심리학회지 : 문화 및 사회문제
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• 제27권4호
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• pp.505-528
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• 2021

본 연구는 인간관계가 중요한 노년기에 가족이나 친구/이웃에게 사회적 지지를 제공하는 것과 그들로부터 사회적 지지를 받는 것에 따른 차이가 있는지 살펴보기 위해 삶의 의미를 매개로 노인의 자기존중감에 미치는 영향을 분석하였다. 부산 및 경남에 거주 중인 60세 이상 310명을 대상으로 가족 또는 비 가족과의 사회적 지지제공 및 지지받기 정도, 삶의 의미, 자기존중감을 측정하였다. 매개효과 분석 결과, 사회적 지지제공은 삶의 의미를 매개로 자기존중감에 미치는 경로가 유의한 것으로 나타나 삶의 의미의 부분매개효과가 확인되었다. 반면, 사회적 지지받기는 삶의 의미에 유의한 영향을 미치지 않는 것으로 나타났다. 이러한 양상은 가족과 비 가족에 관계없이 유사하게 나타났다. 사회적 지지제공이 삶의 의미를 통해 노년기 자기가치감을 증진한다는 결과는 인생 쇠퇴 시기인 노년기 행복의 원천으로서 친밀한 타인과의 사회적 교류의 중요성을 시사한다.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1996년도 가을 학술발표회 논문집
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• pp.258-266
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• 1996

The purpose of this study is to make a reasonable correction in construction stage through exact prediction of long-time differential column shortening that occurs in the high-rise RC building. For this, a self-developed program adopted PCA code is used to predict differential column shortening with sequential loading process. Using this program, the amount of the different column shortening of Amatapura Apartment in Indonesia is predicted and the effect is analyzed. From the result, the major factor affecting the shortening amount in columns is elastic strain and the effect of shrinkage is very small rather than creep. And maximun differential column shortening is appeared near the middle of the building.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.2182-2186
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• 2003

This paper presents the differential type resonant accelerometer (DRXL) and its performance test results. The DRXL is the INS grade, surface micro-machined sensor. The proposed DRXL device produces a differential digital output upon an applied acceleration, and the principle is a gap-dependent electrical stiffness variation of the electrostatic resonator with torsion beam structures. Using this new operating concept, we designed, fabricated and tested the proposed device. The final device was fabricated by using the wafer level vacuum packaging process. To test the performance of the DRXL, a nonlinear self-oscillation loop is designed using describing function technique. The oscillation loop is implemented using discrete electronic elements. The performance test of the DRXL shows that the sensitivity of the accelerometer is 12 Hz/g and its long term bias stability is about $2mg(1{\sigma})$. The turn on repeatability, bandwidth, and dynamic range are 4.38 mg, 100 Hz, and ${\pm}\;70g$, respectively.

• Journal of Electrical Engineering and Technology
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• 제10권4호
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• pp.1508-1517
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• 2015

Optimal Power dispatch is the short-term decision of the optimal output of a number of power generation facilities, to meet the system demand, with the objective of Power dispatching at the lowest possible cost, subject to transmission lines power loss and operational constraints. The operational constraint includes power balance constraint, generator limit constraint, and emission dispatch constraint and valve point effects. In this paper, Opposition based Differential Evolution Algorithm (ODEA) has been proposed to handle the objective function and the operational constraints simultaneously. Furthermore, the valve point loading effects and transmission lines power loss are also considered for the efficient and effective Power dispatch. The ODEA has unique features such as self tuning of its control parameters, self acceleration and migration for searching. As a result, it requires very minimum executions compared with other searching strategies. The effectiveness of the algorithm has been validated through four standard test cases and compared with previous studies. The proposed method out performs the previous methods.