• Journal of the Korean earth science society
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• v.24 no.5
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• pp.440-448
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• 2003

We have performed 3-D geomagnetic induction Modeling considering with anomalous conductive structures to interpret the conductive anomaly proposed by previous studies on the Korean Peninsula. The results of modeling coincide well with the observed induction arrow. we confirm the fact that Imjin River Belt and Ogcheon Belt presumed in the model are reasonable. In the western-middle area of the peninsula (YIN, ICHN) the induction arrows seem to reflect the existence for the Imjin River Belt and the induction arrows in western-south area (HNS, CHY, DZN, MWN) is likely to reflect the effect of the Ogcheon Belt. The difference arrows, calculated by subtracting the sea effect from observed induction arrow in the western area of the peninsula at the period of 60-minutes, show little difference with the observed induction arrows. Especially, the difference arrows in YIN, ICHN also show a similar pattern to those at the periods longer than 10-minutes. These results strongly suggest that the Imjin River Belt and the Ogcheon Belt extend down to the deep part of the crust in spite of the limitation of our model.

• Journal of the Korean Geophysical Society
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• v.5 no.4
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• pp.305-319
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• 2002

The three-dimensional MT(Magneto-Telluric) modeling is performed to examine the validity of difference arrow of GDS(Geomagnetic Depth Sounding) survey, In this paper, we investigate the validity of the difference arrow on three configurations of conductors; which is located 1) at surface, 2) at the deep part and 3) vertically extended f개m surface to the deep part, respectively, For conductors located at surface, the validity of difference arrows is certified in our numerical model when long periods over 40 minutes are used or the distance between sea and conductor is over 150 km. However, for conductors located at the deep part, the validity of difference arrow is dependent on the size of conductors. Further, if the size of conductor is adequately larger than that of our model, we recognize the possibility that the mutual coupling of them influences up to longer periods, Moreover, in case of conductors which is vertically extended from surface to the deer part, the mutual coupling of them is reinforced for all periods, especially for longer periods, so that the validity of difference arrow is considerably in doubt. Therefore, to remove the known conductor effect such as the sea effect from the observed induction arrow, the mutual coupling between them must be examined. The difference arrow that certifies the validity in this way can only provide the Subsurface information based on physical supports.

• Economic and Environmental Geology
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• v.35 no.6
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• pp.567-573
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• 2002

Two-dimensional MT (Magneto-Telluric) modeling is performed to verify the validity of difference arrow for GDS(Geomagnetic Depth Sounding) survey. The electromagnetic mutual coupling between the sea and in-land conductor is used as a criterion that judges the validity of difference arrow. In this study, the mutual coupling between them is examined according to the spatial distance between them and the period of magnetic variations. The difference arrow is valid for conductors located at surface which are far from the sea or when the long period is used, but the mutual coupling is weak for buried conductor in all the periods. However, when a conductor extends vertically down to the deep part, the validity of difference arrow is in doubt, since the strong mutual coupling influences up to the long period. Therefore, to remove the known conductor effect such as sea effect from the observed induction arrow, the mutual coupling between them must be examined and the caution must be exercised in interpreting the resultant difference arrow if mutual coupling between them is strong.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.46 no.12
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• pp.1049-1055
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• 2018

This paper proposes the Signal Quality Indicator (SQI) to certify the wired communication channels connected between sub-systems embedded in guided flight systems. The communication signals can be distorted due to the poor interconnections of wired channels, the interference from the signals passing through the adjacent routed channels, and additive white Gaussian noises. As the ways to find out the condition of the communication channels, we present the Hamming distance based SQI (H-SQI) and the Euclidean distance based SQI (E-SQI). Two SQIs are compared in terms of the SQI resolution performance and the required number of hardware resources for implementations. The E-SQI requires the 10 times FPGA resources and an additional analog-digital converter over the H-SQI in spite of its outstanding SQI resolution performance. Moreover, the H-SQI could have the enough SQI resolution performance to find out the channel condition by increasing the oversampling rate, so the H-SQI is the more adequate than the E-SQI for the SQI of the guided flight systems.

• Proceedings of the Korean Society of Computer Information Conference
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• 2022.01a
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• pp.227-230
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• 2022

본 연구에서는 실질적 학습자가 교수자로 착각을 한 상태에서 아바타를 학습시키는 과정을 통해 학습이 되게 하는 구조를 설계하고 제안하였다. 시스템 관리자와 교육자료 형성자를 제외하면, 교수자로 착각하고 있는 '학습자'와 학습자의 공부를 위해 노력하는 학습 가이드 역할을 '학습 관찰자', 학습이 되는 아바타로 구성된다. '학습 관찰자'는 학습 방향을 제시하여 아바타가 활동하는 방향을 지시하게 되며, 아바타는 지시된 방향에서 1:1 학습과 같은 형태로 교수자 입장 학습자에게 공부도움을 요청하게 된다. 아바타의 학습은 인공지능 지도 학습 방법을 이용하여 학습되도록 하며, 교수자로 착각하는 학습자는 아바타 학습 시 아바타에 의해 슬며시 제공되는 학습 자료를 참고하며 아바타를 공부시키게 되는 데 아바타를 공부시킨다고 노력하는 과정이 교수자로 착각된 학습자가 공부가 되는 것이다. 또한 이렇게 학습하는 과정을 거쳐 지식이 성장한 아바타는 아바타들이 경쟁하는 경진 대회에 참가하게 되며 교육자로 착각하는 학습자는 관전 또는 코치를 하며 학습을 하게 된다. 이러한 방법을 통해 교육자로 착각하는 학습자는 부모의 마음으로 적극적으로 공부를 하게 유도하며, 흥미를 갖고 공부를 하게 할 뿐 아니라, 가르치는 사람에 준하는 깊이 있는 지식을 갖도록 유도하며, 본 시스템과 온라인 오프라인을 통해 연결 되게 한 운동 기구 및 운동 환경을 이용하여 운동 하도록 유도하고 파워가 되도록 하여 운동 활동을 유도하며, 단계 마다 적당한 보상 점수들이 제공되도록 하여 지덕체가 성장되도록 하는 설계이다.

• Journal of Digital Convergence
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• v.18 no.1
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• pp.53-58
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• 2020

Various imperative statements that can be represented in the way in which the product or service is used describe how or how to achieve the goals, or induce or prohibit a specific action. This study focuses on The Effects of age and type of imperative sentence (directive vs. declarative) on behavioral intention and recall. As a result of the experiment, older people who have shorter lives remaining access information in a more emotional way, so they have been rejected by directive (vs. declarative) statements that felt more negative feelings, resulting in lowered behavioral intention. Conversely, the negative feeling caused by directive statements increased salience of directive (vs. declarative) sentence for older people more, which in turn increased memory for older people. Process analysis showed that emotions when exposed to statements mediated these results. The results of this study show that in order to improve consumers' behavioral response and/or the performance of information processing, it is necessary to deeply consider their age and how to construct the statement.

• Journal of the Korean earth science society
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• v.26 no.5
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• pp.429-435
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• 2005

3D RMR (Rock Mass Rating) analysis has been performed by applying the Geostatistical integration technique for geophysical and borehole data. Of the various geostatistical techniques for the integrated data analysis, in this study, we applied the SKlvm (Simple Kriging with local varying means) method that substitutes the values of the interpreted geophysical result with the mean values of the RMR at the location to be inferred. The substitution is performed by the indicator transform between the result of geophysical interpretation and the observed RMR values at borehole sites. The used geophysical data are the electrical resistivity and MT result, and 10 borehole sites are investigated to obtain the RMR values. This integrated analysis makes the interpretation to be more practical for identifying the realistic RMR distribution that supports the regional geological situation.

• The Journal of the Petrological Society of Korea
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• v.23 no.3
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• pp.229-237
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• 2014

The Lu-Hf isotope system, coupled with the advent of multiple collector inductively coupled plasma source mass spectrometry, is now widely utilized as a tracer for geological processes. The paper presents a comprehensive review on the principles of the Lu-Hf isotopes, and its current and potential applications to both geochronology and petrogenesis. Finally, based on the Lu-Hf isotopic data from Korean mafic and ultramafic rocks, its has been discussed evolution of the mantle beneath the Korean Peninsula.

• Journal of the Korean Chemical Society
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• v.62 no.6
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• pp.441-452
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• 2018

This study investigated mentor teachers' mentoring types and how the types of mentoring changed throughout the collaborative mentoring program for beginning science teachers who had difficulties in teaching practice. One-on-one mentoring meetings were audio-taped and transcribed for analysis. The result of the study showed that mentors took various roles such as Observer, Critical friend, Provider of feedback, Instructor, Role model, Evaluator, Counselor, and Equal partner. However, if mentoring did not bring about a change in the perception of a science instruction of a mentee teacher, there was no positive change in the teaching of the mentee teacher. Therefore, mentor teacher must have enough time to concretely discuss about mentee teachers' perception of a science instruction, mentoring method, etc. with mentee teacher before mentoring.

• 한국지구과학회:학술대회논문집
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• 2005.09a
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• pp.124-131
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• 2005

A GDS (Geomagnetic Depth Sounding) method, one of extremely low-frequency EM methods, has been carried out to examine deep geo-electrical structures of the Korean peninsula. In this study, five additive GDS sites acquired in south-eastern area of the Korea were integrated into twelve previous GDS results. In addition, 3-D MT modeling considering the surrounding seas of the Korean peninsula was performed to evaluate sea effect at each GDS site quantitatively. As a result, Observed real induction arrows was not explained by solely sea effect, two conductive structures that are able to explain differences between observed and calculated induction arrows, was suggested. The first conductive structure is the Imjingang Belt, which is thought as a extension of Quiling-Dabie-sulu continental collision belt. The effects of the Imjingang Belt clearly appear at YIN and ICHN sites. The second one is the HCL (Highly Conductive Layer), which is considered as a conductive anomaly by mantle upwelling generated in back-basin region. The effects of the HCL are also confirmed at KZU, KMT101, 107 sites, in the south-eastern of the Korean peninsula.