• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.22 no.6
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• pp.137-141
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• 2022

The method of estimating the azimuth by measuring the geomagnetism has been used for a very long time. However, there are many cases where an error occurs in the estimated azimuth due to disturbances in the earth's magnetic field due to metal structures inside and outside the room. Although many studies have been conducted to correct this, there is a limit to reducing the error. In this paper, we propose a method of estimating the azimuth by applying the measured geomagnetic sensor data to the neural network of the LSTM structure. Data preprocessing is very important for learning a neural network. In this paper, data is collected using the built-in acceleration sensor, gyro sensor, and geomagnetic sensor in the smartphone, and the geomagnetic sensor data is uniformly sampled using EKF. As a result, an average azimuth estimation error of 0.9 degrees was obtained using four hidden layers.

• Economic and Environmental Geology
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• v.47 no.4
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• pp.395-404
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• 2014

We conducted the geophysical survey of possible hydrothermal vent sites at 2009, in the Lau Basin, the south western Pacific and analyzed the magnetic characteristics of TA19-1 and TA19-2 seamounts. TA19-1 is a cone-shaped seamount with a caldera summit. TA19-2 seamount is bigger and shows more complicated topography than TA19-1 seamount. TA19-2 has a large caldera, a summit in the west side of the caldera and several crests. Simple dipole anomalies with a high over the north and a low over the south occur in TA19-1 seamount. High magnetic anomalies are located in the northern flank and the summit of TA19-2 seamount and low anomalies around the summit and the caldera. The results of bathymetry and magnetic data suggest that TA19-2 seamount might have more complicated magmatic process than TA19-1. Low magnetization zones are located over the summit, the calderas and the caldera rims. The magnetization lows indicate that submarine hydrothermal vents, along faults and fracture zones, could have caused an alteration of magnetic minerals. The magnetization highs over the summit and the calderas might have been related with later magmatisms like volcanic sills, intrusions.

• Journal of Ocean Engineering and Technology
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• v.4 no.1
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• pp.35-42
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• 1990

The area where age dating of the seafloor and interpretation of geomagnetic basic structure are conducted is also important in the aspect of geophysics. Near the sea mount (water depth to the top is 3900m and 6500m to the bottom), there are Mesozoic magnetic lineations at the sea-side flank along the trench axis. A two dimensional model analysis of Talwani and Heirtzler(1964) and a three dimensional model analysis of Talwani are performed by using data obtained from the marine proton magnetometer. Distribution, direction of the lineation, amplitude and period of magnetic anomaly are correlated and analysed with speed of the plate movement and lineation of the sea mount. In the west and north-west Pacific there are lots of huge sea mounts retaining the history of oceanic crust. This indicates that geomagnetic basis subsided into the oceanic crust and has interest in the aspects of the isostasy theory of the gravity.

• Journal of the Korean Magnetics Society
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• v.2 no.1
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• pp.56-60
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• 1992

광자기 디스크의 자기 및 기록특성에 SiN 하지층이 미치는 영향에 대해서 연구하였다. PC기관에 4층구조막의 디스크를 DC 마그네트론 스퍼터링에 의해 성막하였으며 스퍼터링 압력이 증가함에 따라 SiN 박막의 표면이 거칠어 지고 주상형성장이 현저하게 나타났다. SiN 하지층의 비세조직의 변화는 자기기록막의 보자력, 수직이방성 등에는 영향을 미치지 않았지만 지구의 형 성과정은 SiN 하지층의 조직에 따라 민감하게 변화하였다. SiN 하지층이 Porous 할수록 광자기 디스크의 기록이 이루어 지는 임계파우워 값이 작고, 또한 자구의 형성이 이루어 지는 임계외자 계의 크기도 넓은 범위에서 나타났다. 광자기 디스크의 기록특성을 증대시키기 위해서는 자기기 록막의 성능과는 관계없이 치밀하고 표면이 평할한 SiN 하지층을 증착하는 것이 필수적임을 관 찰하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2018.01a
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• pp.113-116
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• 2018

본 연구에서는 컴퓨팅 사고력 평가 도구 중 자기보고식 설문과 지필형 검사지인 비버 챌린지 간의 상관관계를 분석하고자 하였다. 두 평가 도구를 사용한 결과 간의 상관관계는 통계적으로 유의하지 않았다. 따라서 객관적인 측정을 위하여 자기보고식 설문에 대한 수정 및 보완이 필요하며, 비버 챌린지의 점수에 영향을 주는 난이도에 대한 고찰이 필요하다. 덧붙여 산출물 평가와 자기보고식 설문, 지필형 검사지 간의 상관관계를 분석할 필요가 있다.

• The Journal of the Korea Contents Association
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• v.14 no.3
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• pp.328-336
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• 2014

The purpose of this study was to identify levels of fatigue and self-efficacy of clinical practice among nursing students and to examine the relationship of fatigue and self-efficacy. A cross-sectional descriptive study was conducted with 207 senior nursing students. Self-administered questionnaires were used to collect data during the period from 1st to 30th of June, 2013. Data were analyzed by descriptive statistics, t-test, ANOVA, and Pearson's correlation coefficient using SPSS 18.0 program. At the results, the average levels of fatigue and self-efficacy were 3.52/5($SD={\pm}.52$) and 3.29/5($SD={\pm}.47$) respectively that meant above moderate. Study participants having motive of admission to nursing school voluntarily and having high satisfaction with nursing major were shown higher self-efficacy. There were correlated negatively between fatigue and self-efficacy(r=-.315, p<.001). By the findings of this study, it is necessary to develop a nursing practice education program to reduce the level of fatigue and improve the self efficacy of nursing students.

• Journal of the Korean Magnetics Society
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• v.20 no.2
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• pp.52-60
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• 2010

The changes of magnetic flux density distribution and the degree of magnetic anomaly on the ground surface by underground fracture zones and empty spaces had been investigated through the variations of the measuring heights. The magnetic flux density distributions were monitored for the ground surfaces of fracture zones, empty spaces and tunnels by fluxgate-type magnetometer. The fracture zones showed the magnetic anomaly with (+) and (-) peak-pairs in the magnetic flux distribution measured at 0.15 m height from the ground surface, and this anomaly disappeared at the height of 1.15 m. The underground empty spaces and tunnels showed the decrease of magnetic flux densities, where the degree of this density decrease diminished with the increase of the underground depth. And, the existence and size of underground empty spaces, such as tunnels and sink holes, could be monitored by the phenomena of this decreasing flux density.

• The Journal of the Korea Contents Association
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• v.16 no.12
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• pp.507-517
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• 2016

This study examines the types and characteristics of traumatic events middle-aged women experience and to explore the effects of attachment in the process of post-traumatic growth and forming a self-realization. 221 of participants were middle-aged women from the area of Seoul, Gyeong-Gi and the survey was composed of post-traumatic experience questionnaire, attachment scale, post-traumatic growth scale, self-realization scale. The type and characteristics of traumatic experience by middle-aged women were executed by frequency analysis and correlation with the structural equation model validation was used in order to analyze the relationship between each variable. the major findings are First, the loss of someone close(such as death, breaking up, divorce, breaking off) was reported as something general yet the biggest crisis event, Second, looking at the relationship between attachment, post-traumatic growth and self-realization, the secure parental attachment and spiritual transformation showed the correlation in all subregions except the subvariables of humanity and self-acceptance and Third, the results of Structural Equation Modeling shows that attachment has a static effect on post-traumatic growth and self-realization, and post-traumatic growth appeared to be the mediating factor of attachment and self-realization.

• The Journal of the Korea Contents Association
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• v.19 no.5
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• pp.578-587
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• 2019

The purpose of this study is to examine differences in mental health indices such as self-compassion, trait anxiety, and depression, and color preference based on Sasang Constitution type. This study also explored the relationships among self-compassion, trait anxiety, and depression. 205 adults were surveyed for participants of this study. A Two-Step Questionnaire (TS-QSCD) was conducted to diagnose Sasang Constitution such as Tae-yangin, Tae-yinin, So-yangin, and So-yinin. Also, scales for self-compassion, trait anxiety, depression level, and color preference were utilized for measures. The results showed that among Sasang Constitutional groups, Ta-yangin had a higher level of self-compassion and lower trait anxiety than So-yinin. Furthermore, in relationships among mental health indices, trait anxiety and depression tendency were lower with higher self-compassion. No significant differences were revealed in depression level and color preference based on Sasang constitution. Finally, implications of this study for mental health were suggested and limitations were discussed.

• Journal of the Korea Convergence Society
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• v.7 no.4
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• pp.163-172
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• 2016

This research was convergence study conducted to understand the effect that parent-son/daughter communications have on the addiction to smartphones, with stress level, self-control, and self-efficacy as the mediator. The subjects were college students located in J province and K province, and 232 questionnaires were used as the data for analysis. As a result, addiction to smartphones had negative correlations with parent-son/daughter communication, self-control, and self-efficacy and had positive correlations with stress level. In addition, parent-son/daughter communication influenced the degree of addiction to smartphones, with stress level, self-control, and self-efficacy as the mediator. Therefore, in order to reduce college students' addiction to smartphones, programs should be developed specifically and systematically to increase their communication with their parents, and it is necessary to draw up measures to reduce students' stress levels and increase their self-control and self-efficacy levels.