• 한국지구과학회:학술대회논문집
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• 2010.04a
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• pp.52-52
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• 2010

동해 한국대지 남부(south Korea Plateau)에서 2010년 2월에 한국해양연구원의 온누리호를 이용하여 해저지형 및 자생광물 탐사가 실시되었다. 다중빔 음향측심기를 이용한 해저지형 조사는 2-3 km 탐사측선 간격으로 약 400 L-km 정도가 실시되었다. 조사구역 A($37^{\circ}$ 16'-18'N, $130^{\circ}$ 02'-16'E)는 890-1,900 m의 수심범위와 남쪽으로 갈수록 수심이 깊어져 울릉분지(Ulleung Basin)와 연결된다. 크고 작은 소규모의 구릉이 사면을 따라 다수 분포하고 있다. 조사구역 B($37^{\circ}$ 26'-40'N, $130^{\circ}$ 23'-34'E)의 정상부는 900-1,000 m로 비교적 평평하게 나타났고, 남동방향으로는 2,200 m까지 급격하게 수심이 증가하는 사면으로 이루어져 있다. 한국대지내 노출 암반지역은 남동쪽 사면의 일부 지역에 분포하고 있다. 자생광물 탐사는 일차적으로 천부지층 탄성파탐사를 수행하여 시료채취 가능 여부를 현장에서 확인한 후에, A 및 B구역내 11개 지점에서 드렛지를 이용하여 암석시료를 채취하였다. 채취된 암석은 주로 현무암이며, 많은 양의 화산기원 부석(pumice) 및 화산재(box core 자료)도 확인되었다. 또한, 인광석으로 추정되는 암석과, 망간단괴(manganese nodules)와 망간각(manganese crust)의 일부 시료도 채취하는데 성과가 있었다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.5 no.2
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• pp.315-320
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• 2001

This paper describes a rotation-type field mill to measure the electric field intensity caused by thunderclouds on the ground level. The field mill developed is consisted of two isolated electrode vanes, a grounded stator and a rotor. To develop a high sensitive field mill, the principles and design rules of a rotation-type field mill are studied. Also, two types of calibration system, such as a cylindrical guard electrodes and a parallel-plate electrodes, are proposed to determine the sensitivity and frequency bandwidth of the field mill. From the calibration experiment, the frequency bandwidth and the sensitivity of the field mill are DC ~ 200 [Hz] and 0.267 [mV/V/m], respectively. Therefore, it can measure the electric field intensity from 73 [V/m] to 18.7 [㎸/m].

• Journal of Korean Philosophical Society
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• v.148
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• pp.291-326
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• 2018

The present lecture aims to discuss Nietzsche's critique of metaphysics, religion and morality through the affect. Nietzsche's philosophical attempt for the existential health of man made possible by the affirmation of the earth as a world of realistic life. The affirmation about the nascent Earth means that one feels the world as a world of pleasure. But metaphysics and religion have imagined the earthly world of this world as a place against lust. That is, metaphysics and religion suppress the actual affect of man. From the aspect of metaphysics, religion and morality, the human affect is dangerous. But according to Nietzsche, affect is the basic condition revealed by man's nature. The present lecture aims to discuss Nietzsche's critique of metaphysics, religion, and morality in the guide to his concept of affect.

• Economic and Environmental Geology
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• v.19 no.4
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• pp.293-296
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• 1986

A modified expression of mutual coupling ratio for a vertical coaxial loop system over a layered earth is derived by transforming the Bessel function of order 0 to that of order 1. This expression allows us to use a single $J_1$ filter instead of a combination of $J_0$ and $J_1$ filters, and produces a significant reduction of computer time and core storage. In this paper, the mutual coupling ratio for a three-layered earth is obtained by means of Anderson's adaptive filter (Anderson, 1979).

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.772-773
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• 2011

발전단지내 발전소와 변전소 접지망이 서로 연결되지 않고 독립적으로 구성된 경우 설비보호를 위한 보호회로가 큰 대지전위 차로 인해 손상되거나 보호설비가 오동작할 우려가 있다. 본 논문에서는 독립된 접지망간 연결된 보호회로에 대지전위 차로 인해 발생할 수 있는 문제를 분석하였으며 고장전류가 유입된 접지망 전위가 상승하면 CT(Current Transformer)회로가 이중접지 된 곳에서는 보호회로가 오동작할 수 있는 조건이 형성되고, 이중접지가 안되었다 할지라도 대지전위 상승이 회로를 통해 전달되어 회로와 외함간 절연파괴가 일어날 수 있으므로 보호회로 케이블이 발전소와 변전소간 연결된 곳에서는 반드시 접지망을 연결하여야 한다는 것을 확인할 수 있었다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.21 no.10
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• pp.181-189
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• 2007

This paper presents a experimental evidence of the generation of the earth potential and communication line noise from the electric railway. There is a critical measurement err in case of measuring the electrical power induced noise voltage and degree of cable balance in the field of earth potential generated. As a results, it has been found that the conventional cable has more noise immunity than shielded cable near the railway where the earth current flows through the sheath layer.

• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.470-471
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• 2006

다중 접지 배전계통에서 발생하는 이상전압으로부터 전력설비의 안정적인 운영과 인체안전을 위해 주로 봉상 접지전극을 이용하여 대지방전경로를 구성하고 있다. 그리고 접지종류별로 접지 저항값을 규정하고 이를 시공에 적용하고 있다. 지락고장이 발생하면 접지전극으로 유입되는 고장전류에 비례하여 대지전위가 상승하기 때문에 이에 대한 인체 안전성측정 및 검토가 필요하다. 따라서 본 논문에서는 IEEE Std 80에서 제시하는 안전성 기준에 기초하여 다중 접지 배전계통에서 접지전극으로 널리 사용되는 봉상 접지전극을 대상으로 상용주파전류를 인가하여 대지전위상승에 따른 접촉전압을 측정하였으며, CDEGS 프로그램을 이용하여 보폭전압을 모의하였다. 또한 이 값을 IEEE Std 80에서 제시하는 최대 허용 보폭전압과 접촉전압과 비교하여 인체 안전성을 검토하였다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.19 no.5
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• pp.74-79
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• 2005

In this paper the earth structures of four cities are analysed on the basis of the measured soil resistivity and the characteristics of a grounding system is examined. As a result it is revealed that the soil resistivity has an effect on touch voltage and step voltage, which are directly related to safety, as well as ground resistance.

• Economic and Environmental Geology
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• v.45 no.3
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• pp.317-333
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• 2012

The Yeongweol Group is a Lower Paleozoic mixed carbonate-siliciclastic sequence in the Taebaeksan Basin of Korea, and consists of five lithologic formations: Sambangsan, Machari, Wagok, Mungok, and Yeongheung in ascending order. Sequence stratigraphic interpretation of the group indicates that initial flooding in the Yeongweol area of the Taebaeksan Basin resulted in basal siliciclastic-dominated sequences of the Sambangsan Formation during the Middle Cambrian. The accelerated sea-level rise in the late Middle to early Late Cambrian generated a mixed carbonate-siliciclastic slope or deep ramp sequence of shale, grainstone and breccia intercalations, representing the lower part of the Machari Formation. The continued rise of sea level in the Late Cambrian made substantial accommodation space and activated subtidal carbonate factory, forming carbonate-dominated subtidal platform sequence in the middle and upper parts of the Machari Formation. The overlying Wagok Formation might originally be a ramp carbonate sequence of subtidal ribbon carbonates and marls with conglomerates, deposited during the normal rise of relative sea level in the late Late Cambrian. The formation was affected by unstable dolomitization shortly after the deposition during the relative sea-level fall in the latest Cambrian or earliest Ordovician. Subsequently, it was extensively dolomitized under the deep burial diagenetic condition. During the Early Ordovician (Tremadocian), global transgression (viz. Sauk) was continued, and subtidal ramp deposition was sustained in the Yeongweol platform, forming the Mungok Formation. The formation is overlain by the peritidal carbonates of the Yeongheung Formation, and is stacked by cyclic sedimentation during the Early to Middle Ordovician (Arenigian to Caradocian). The lithologic change from subtidal ramp to peritidal facies is preserved at the uppermost part of the Mungok Formation. The transition between Sauk and Tippecanoe sequences is recognized within the middle part of the Yeongheung Formation as a minimum accommodation zone. The global eustatic fall in the earliest Middle Ordovician and the ensuing rise of relative sea level during the Darrwillian to Caradocian produced broadly-prograding peritidal carbonates of shallowing-upward cyclic successions within the Yeongheung Formation. The reconstructed relative sea-level curve of the Yeongweol platform is very similar to that of the Taebaek platform. This reveals that the Yeongweol platform experienced same tectonic movements with the Taebaek platform, and consequently that both platform sequences might be located in a body or somewhere separately in the margin of the North China platform. The significant differences in lithologic and stratigraphic successions imply that the Yeongweol platform was much far from the Taebaek platform and not associated with the Taebaek platform as a single depositional system. The Yeongweol platform was probably located in relatively open shallow marine environments, whereas the Taebaek platform was a part of the restricted embayments. During the late Paleozoic to early Mesozoic amalgamations of the Korean massifs, the Yeongweol platform was probably pushed against the Taebaek platform by the complex movement, forming fragmented platform sequences of the Taebaeksan Basin.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.5 no.6
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• pp.1094-1103
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• 2001

According to standard procedures as defined in the users handbook for sea level data processes, I was compared to Topex/Poseidon sea level data from the first 350days of mission and Tide Gauge sea level data from the Amsterdam- Crozet- Kerguelen region in the South Indian Ocean. The comparison improves significantly when many factors for the corrections were removed, then only the aliased oceanic tidal energy is removed by oceanic tide model(11) in this period. Making the corrections and smoothing the sea level data ()ver 60km along-track segments and the Tide Gauge sea level data for the time series results in the digital correlation and RMS difference between the two data of c=-0.12 and rms= 11.4cm, c=0.55 and rms=5.38cm, c=0.83 and rms=2.83cm, and c=0.24 and rms=6.72 for the Amsterdam, Crozet and Kerguelenplateau, and Kerguelen coast, respectively. It was also found that the Kerguelen plateau has a comparisons due to propagating signals(the baroclinic Rossby wave with velocity of -3.9 ~-4.2cm/sec, period of 167days and amplitude of 10cm) that introduce temporal lags(${\gamma}$: 10~30days) between the altimeter and tide gauge time series. The conclusion is that on timescales longer than about 10days the RMS sea level errors are less than or of the order of several centimeters and are mainly due to the effects of currents rather than the effects of stories(water temperature, density) and winds.