• Proceedings of the KSEEG Conference
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• 1999.04a
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• pp.193-193
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• 1999

• Proceedings of the KSEEG Conference
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• 2000.04b
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• pp.155-157
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• 2000

• Journal of the Korean Chemical Society
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• v.64 no.6
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• pp.360-370
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• 2020

This study explored the learning environment for promoting conceptual understanding, immersion, and situational interest in small group learning using augmented reality, according to the level of students' self-regulation. 95 ninth-grade students from a coed high school in Seoul participated in this study. Students were divided into a group of four and each group was randomly assigned to three learning environments that provide one marker and one smart device(1-1), two markers and two smart devices(2-2), and four markers and four smart devices(4-4) for a group. Small group learning using augmented reality was conducted for two class periods about the chemical bonding concept from the Integrated Science subject. Two-way ANOVA results revealed that students in the 4-4 learning environment scored significantly higher than those in the 1-1 or 2-2 learning environment in a conception test. Changes in the learning environment have affected students with a low level of self-regulation. In an immersion test, students in the 4-4 learning environment scored significantly higher than those in the 1-1 learning environment, and changes in the learning environment have affected students with a high level of self-regulation. As a result of situational interest test, students in the 4-4 and 2-2 learning environments scored significantly higher than those in the 1-1 learning environment, and changes in the learning environment have affected students with a low and a high level of self-regulation. Based on the results, the educational implications of the learning environment for promoting conceptual understanding, immersion, and situational interest in small group learning using augmented reality are discussed.

• Journal of the Korean Magnetics Society
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• v.24 no.1
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• pp.22-27
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• 2014

North indicating azimuth angle sensors have been used in airplanes, ships traditionally and nowadays employed in smart phones. For the azimuth and roll angle measurement of the sensor, 3-axis acceleration sensor was added to the 3-axis magnetic field sensor. In this work, we have constructed a measuring system for the measurement of the magnetic field and the angle uncertainty of the magnetic field sensors. Measuring system could be useful not only in non-magnetic laboratory but also in normal laboratory, we constructed small size of 3-axis Helmholtz coils for the compensation environment magnetic field (Earth magnetic field and magnetic field from building) and the generation of magnetic field for the test of magnetic field sensor. The constructed measuring system could compensate environment magnetic field below 10 nT level and generate 3-dimensional magnetic field with magnitude uncertainty of 0.2 % and angle error of $0.2^{\circ}$ within the volume of ${\pm}30mm$ diameter at center of Helmholtz coils. For the conformation of developed measuring system, We tested commercially available 3-axis magnetometer and heading sensor.

• Journal of the Korean Applied Science and Technology
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• v.38 no.2
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• pp.551-566
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• 2021

The purpose of this research is to positively analyze the self-efficacy and the impact of self-management on business performance, and to help improve self-efficacy and business performance through self-management of beauty professionals. The analysis methods were frequency analysis, factor analysis, reliability analysis, correlation analysis, and multiple regression analysis, and as a result, there was a positive (+) correlation between self-management, self-regulation, and challenge. There was a statistically significant positive (+) effect on business performance, environmental performance, customer performance, and market performance, and self-efficacy had a statistically significant positive (+) effect on job performance, environmental performance, customer performance, and market performance. Was found to appear. Therefore, I hope that it will be an opportunity to contribute to self-efficacy and management performance through qualitative improvement in self-management.

• The Bulletin of The Korean Astronomical Society
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• v.40 no.2
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• pp.27.1-27.1
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• 2015

천문학적 유체는 대부분 자기장을 가지고 있으며 난류상태에 있다고 믿어진다. 본 발표에서는 다양한 환경에서 존재하는 자기유체역학적(MHD) 난류를 소개하고자 한다. 첫째, 가장 간단한 경우로 비압축성 유체에서 발생하는 MHD 난류를 살펴보고자 한다. 이 경우, 평균자기장의 세기가 약한 경우와 강한 경우로 나누어 볼 수가 있는데, 평균자기장의 세기가 아주 약한 경우 난류에 의한 자기장의 증폭 현상이 특히 중요하다. 평균자기장의 세기가 강한 경우는 난류의 스펙트럼과 구조가 큰 관심사가 되고 있다. 둘째, 작은 스케일 난류와 초음속 압축성 난류를 간단히 소개하고자 한다. 작은 스케일(이온의 자이로 반경 부근) 난류는 아직 연구가 미진한 분야 중 하나이고 초음속 압축성 난류는 해석적 연구가 어렵기 때문에 연구의 많은 부분을 수치계산에 의존하고 있다. 마지막으로, MHD 난류에 대한 지식이 어떻게 관측에 응용될 수 있는지 간단한 예를 들고자 한다.

• Proceedings of the KSMRM Conference
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• 2001.11a
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• pp.107-107
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• 2001

목적： 초상자성 nano-particle 조영제의 자기이완효과에 관한 out sphere 기전에 기초하여 각각의 자기장의 세기에서 T1/T2 자기이완율을 나타내는 NMRD profile을 수치적으로 simulation 하는 프로그램을 개발하고자 하였다. 대상 및 방법： 초상자성 nano-particle 조영제의 경우 초상자성 물질을 생체적합성 고분자로 표면 coating하기 때문에 상자성 조영제와는 달리 전적으로 "out sphere"기여도만을 고려하였고 또한 초상자성 물질의 경우 자기적 에너지의 크기가 매우 크기 때문에 상자성 조영제의 기전에서 사용되는 "low field"근사를 사용할 수 없으므로 Brillouin 함수로 표현되는 총자화에 대한 표현을 적용하였다. nano-particle내에 포함된 Fe 원자수에 따른 T1 및 T2 NMRD Profile과 온도에 따른 T1 및 T2 NMRD Profile 그리고 초상자성 nano-particle size에 따른 T1 및 T2 NMR Profile을 PC (CPU=800 Mhz, memory=128 MB) 환경하에서 symbolic computation tool 인 MathCad (MathCad, USA)를 사용하여 구현하였다.

• Proceedings of the KIPE Conference
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• 2015.11a
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• pp.56-58
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• 2015

본 논문은 자기유도 무선전력 전송하에 송수신부간 양방향 자기장 무선통신 시스템을 제안한다. 송수신부의 무선전력전송 중 양방향 무선통신은 수신부가 장착된 전자기기의 무선충전시 수신부의 안정적인 전력공급 측면에서 필수적이다. 제안하는 양방향 자기장 무선통신 시스템은 송수신부간 복잡한 IC 회로 또는 추가적인 무선통신회로 없이 단순 공진 필터 및 통신용 변압기만을 이용하여 외부환경에 강인하면서도 경제적인 무선통신이 가능하다. 본 논문에서는 제안하는 자기장 무선통신 시스템의 전력선 및 통신선 등가회로를 각각 분석하였고 실험 및 시뮬레이션을 통해 그 타당성을 검증하였다.

• Journal of Wetlands Research
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• v.13 no.3
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• pp.567-579
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• 2011

Scirpus planiculmis is one of the most dominant species found in the Nakdong River estuary. In order to understand the recent changes in S. planiculmis and the environmental characteristics of the estuary, from 2005 to 2010, an analysis of the density, total dry biomass, tuber biomass, and distribution pattern of S. planiculmis as well as an analysis of the temperature, salinity, precipitation, barrage discharge, and soil texture of the estuary were conducted. In 2006, the density ranged from 10.1 to $87.6no./m^2$, but in 2009, it ranged from 0.4 to $2.2no./m^2$ in 2009 and drastic reductions were observed throughout the sampled areas in the Nakdong river estuary. In 2010, S. planiculmis was observed on the tidal flats of Myungji and Mangummerydeung, at a density of $18.3{\pm}7.7no./m^2$ and $17.5{\pm}20.7no./m^2$, respectively. Hence, S. planiculmis is considered to be in a recovery phase. The aboveground/belowground ratio reduced from $4.54{\pm}0.70$ in 2005 to $1.91{\pm}0.35$ in 2009, clearly showing a large decrease in the biomass amount of the aboveground than of the belowground. Tubers were distributed in the soil, with only 36.0% at the 0~15 cm depth but 64.0% at the 15~30 cm depth. Apparently, tubers were more likely to be found at 15~30 cm below the soil in the Nakdong River estuary. A drastic reduction in the S. planiculmis biomass in 2009 is possibly due to the high salinity in S. planiculmis habitats.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.10
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• pp.341-350
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• 2019

The aim of this study was to establish research hypotheses and conduct empirical analysis to clarify the relationship between self-leadership, self-efficacy, job satisfaction, and job performance of researchers in the energy and environment fields. Data were extracted from questionnaires returned by 165 researchers in the field of energy environment among 200 questionnaires collected for approximately three weeks. The reliability, frequency, descriptive statistics, correlation analysis, multiple regression analysis, and sobel-test were examined using the SPSS 22.0 statistical program. The self-leadership of the researcher has a positive (+) effect on self-efficacy, job satisfaction, and job performance, and the researcher's self-efficacy has a positive (+) influence on both job satisfaction and job performance. In addition, the self-efficacy and job satisfaction mediated the relationship between self-leadership, and job performance. Therefore, to improve the job performance of the researchers, it is important to establish a system for the human resource management of the affiliated institutions and revitalize the education for the self-leadership and self-efficacy improvement. In addition, it is necessary to provide an appropriate compensation system to satisfy the researchers' enjoyment, satisfaction and trust in their jobs. In particular, because self-efficacy is a very important factor for job performance, it is important to prepare an institutional strategy for strengthening the self-efficacy of researchers.