• Tunnel and Underground Space
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• v.15 no.2 s.55
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• pp.111-118
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• 2005

The area of investigation belongs to Okchon metamorphic zone and the fault fractured zone runs parallel to the tunnel direction. It causes the independent decline of tunnel face and the slackness of the tunnel surrounding base so, after all, the severe displacement has occurred within the tunnel. Accordingly, the TSP(Tunnel Seismic Prediction) survey has been performed to investigate the extent of fault fractured zone and to analize its characteristics. Also, we have analized the behavior causes by performing the tunnel face mapping and drilling investigation, and confirmed the position and scale of geological anomaly area and front fractured zone which influences tunnel excavation and supporting. Collected data analyzed ground layer condition through 3 dimensional modeling. Several variables included in the modeling were analyzed by geostastistics. The analysis of the modeling data shows that the belt of weathering by fault fractured zone is developing on the basis of the right side of tunnel and that is decreasing to the left side. The fault fractured zone was confirmed that it has strike, $N0\~5^{\circ}E$ dip NW, and it is consisted of large-scale fractured zone including several anomalies. The severe displacement in tunnel is probably caused by asymmetrical load that n generated by the crossing of discontinuity and the rock strength imbalance of tunnel's both side by fault fractured zone, and judge that need tunnel reinforcement method of grouting etc.

• Economic and Environmental Geology
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• v.34 no.5
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• pp.437-446
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• 2001

Zoned epidotes formed by the propylitic alteration of the Bobae sericite deposit in western Pusan show complex compositional zoning patterns, such as multiple growth zoning, oscillatory zoning, patchy zoning and irregular zoning. The complex zoned epidote, in general, shows AI-rich cores and Fe-rich rims. Pistacite component (Ps) in the epidote ranges from 18.5 to 74.3 mot.%. Remnant textures in multiple growth zoning indicate that the earlier zone was partially resorbed prior to growth of later one. Multiple growth zoning and oscillatory zoning suggest that hydrothermal system underwent rapid changes and fluctuations in fluid chemistry, redox condition, or temperature.

• The Journal of the Petrological Society of Korea
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• v.18 no.4
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• pp.307-314
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• 2009

Zapla iron ore bodies in Jujuy state, northern Argentina are located within Paleozoic Silurian marine sedimentary rocks and can be categorized into ironstone deposit. Iron ores contain oolitic hematite as main iron mineral as well as siderite and chamosite. Hematite replaced biotite and/or muscovite along their cleavage or grain boundary, which indicates hematite is precipitated by chemical reaction. Silurian basins in northern Argentina has high potential resources for ironstone deposit but economic aspects of ore body can be controlled by magnitude of lateral vertical extensions and local grade variation of iron beds.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2010.04a
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• pp.53-56
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• 2010

An aerial multi-looking camera system equips itself with five separate cameras which enables acquiring one vertical image and four oblique images at the same time. This provides diverse information about the site compared to aerial photographs vertically. However, multi-looking Aerial Camera for building a 3D spatial information don't use a large-size CCD camera, do uses a medium-size CCD camera, if acquiring forward, backward, left and right imagery of Certain objects, Aerial photographing set overlap and sidelap must be considered. Especially, Sideward-looking camera set up by the sidelap to determine whether a particular object can be acquisition Through our research we analyzed of sideward footprint and aerial photographing efficiency of Multi-view imagery by sidelap changing.

• The Journal of the Acoustical Society of Korea
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• v.24 no.8
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• pp.454-461
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• 2005

Time spread due to the multipath in underwater acoustic channel, induces ISI (Inter-Symbol Interference) which degrades the performance of the underwater acoustic communication system. The passive phase conjugation (PPC) which improves the signal to multipath interference ratio (SMR) and therefore reduces the frequency selectivity. is a diversity communication technique giving a less ISI under multipath fading channel. Its frequency selectivity depends on the number of receiver array sensors and time varying source to receiver range. In this study, frequency selectivity of the PPC and its effects on bit error of underwater acoustic communication is analyzed by numerical simulation.

• Information and Communications Magazine
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• v.25 no.6
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• pp.18-24
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• 2008

항공분야 산업은 기계/전자/소재/정보통신 등 첨단과학기술이 유기적으로 융합되어 운영되는 대표적인 IT융합산업이다. 특히, 항공기에서 IT기반 기술이 융합되어 적용되는 곳은 조종사의 성공적인 임무수행을 위한 항공기에 탑재된 응용 소프트웨어와 항공전자장비들로 구성된 항공 임베디드 시스템이다. 항공 임베디드 시스템은 항공기의 성능과 직결되고 신규 개발 및 성능 개량 시 필수적으로 개발해야하는 시스템 종속적인 1차 시스템과 시스템 독립적이며 국내외 부품시장에서 구매 가능한 서브시스템인 2차 시스템으로 나눌 수 있다. 최근 기간산업에 IT 활용 비중이 점차 높아짐에 따라 IT가 기간산업의 경쟁력을 좌우하는 핵심 요소로 부상하고 있으나, IT산업은 성장이 점차 둔화되고 있는 실정이다. 지식경제부는 이에 따라 기간산업의 경쟁력을 높이고 IT기반 융합신산업을 창출하기 위해 5대 IT융합 신 산업 창출과제를 발표했다. 5대 과제중의 하나인 국방전력 극대화 사업으로 우리 기술로 개발한 초음속 고등훈련기인 T-50에 탑재되는 임베디드 소프트웨어 및 컴퓨터를 국산화하고 있다. 본 사업으로 비행운용프로그램, 실시간 운영체제, 미들웨어, 임무컴퓨터 및 무장관리컴퓨터 등이 순조롭게 개발될 경우 전량수입에 의존하고 있는 T-50의 1차 시스템을 100% 국산화할 수 있을 것으로 기대되며 수입대체 효과와 유지보수비용 절감으로 약 2조원의 부가가치 창출이 예상된다. 본 논문에서는 현재 개발을 진행하고 있는 항공 임베디드 시스템에 대하여 알아본다.

• Survey Research
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• v.4 no.2
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• pp.87-102
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• 2003

Till now, much progress has been made in election forecasting. But fixed-line telephone survey has limitations, because it has become more and more difficult to get a representative sample, Exit poll has been considered to provide a new solution. From the beginning, exit poll provided more accurate predictions than those based on surveys using fixed-line phone. In 2002 presidential election, prediction based on exit poll was perfect. Its predictive error was zero. This paper describes how the exit poll was done in 2002 presidential elections. Specifically, we are to show the estimating procedures as well as sampling and polling process. Among many factors, sampling procedure has been fond to be the most important factor in exit poll accuracy.

• The Korean Journal of Zoology
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• v.32 no.1
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• pp.9-13
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• 1989

A study of benthic populations on a tidal flat near Inchon has revealed the presence of Amphictene japonica (Nilsson) a large pectinariid polychaete worm not previously documented in Korean waters. Near Inchon it is apparently restricted to silty sands or sandy silts along seaward parts of the intertidal flat. In addition to its large size, A. japonica is distinguished from other pectinariids by means of (1) the posterior rim of the cephalic plaque, which bears 20 to 25 marginal denticulations, and (2) the scaphal hooks, which number 19 to 24 on either side.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.1
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• pp.351-357
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• 2013

Two cameras which function like human eyes, are needed to make 3D stereoscopic image. That is, stereoscopic image is made via 3 dimensional image processing for combining two images from left and right camera. In this paper two high resolution zoom cameras are used to make HD resolution stereoscopic camera. And the algorithm which convert to stereoscopic image from HD resolution zoom camera image, is implemented using FPGA for real-time operation. The algorithm which measure the depth of object between left and right image is proposed.

• Korean Journal of Soil Science and Fertilizer
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• v.2 no.1
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• pp.75-78
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• 1969

The necessary number of hills for panicle counts have been obtained, and are more in Kangwon-Do and Chulla Nam-Do where the variability of sampling error is higher as compared to other provinces. It seems that number of samples do not depend on the latitude but on the variabilities of yield components within the province and it is considered that about 5% sampling fraction gives about 75 to 85% of relative information on the average.