• Economic and Environmental Geology
• /
• v.46 no.4
• /
• pp.359-373
• /
• 2013

Shale is considered as a source rock for conventional oil and gas exploration and development because shale is fine-grained detrital sedimentary rock which can preserve the organic matter better. Shale has a good sealing capacity for the petroleum trap due to its low permeability. Commercial recoveries of gas from shale in the North America based on the development of technologies of horizontal drilling and hydraulic fracturing reveal that shale also function as a effective reservoir rock. Geochemical techniques to evaluate generation potential of the hydrocarbons from organic matter in the source rocks can be applied for the exploration of the shale gas resources. To evaluate shale gas resources, it is important to understand various geochemical processes and shale characteristics controlling generation, storage and estimation of shale gas reserves. In this paper, the generation mechanism of the oil and gas from organic matter is reviewed, and geochemical techniques which can be applied for the evaluation and characterization of shale gas are introduced.

• Korean Journal of Construction Engineering and Management
• /
• v.8 no.1 s.35
• /
• pp.107-115
• /
• 2007

Today's human life is more conveniently advantaged and abundant as industrial society advanced. However, the development has been creating a serious environmental crisis. Environmental pollution and exhaustion of natural resources recently became an important issue in construction industry as well as the concern about construction waste management and recycling the resources has arisen. Because the industrial wastes are not only increased quantitatively but also qualitatively intricate and various, groping for ways of reducing the use of resources primarily and recycling is urged on promotion. Currently, only about 33% of the wood wastes produced in construction site are recycled and the others are incinerated or disposed through irregular circulation process. In this study, I will investigate the present status of generating, processing, and recycling construction wood wastes and compare domestic disposal trend to other countries. In addition, I will analyze the actual condition of processing wood wastes in the construction site, verify the irrational causes, and simplify anomalous factors for the purpose of more efficient and correct activation of wood waste treatment and recycling on construction field and protection of environment in the long run.

• Journal of the Korean GEO-environmental Society
• /
• v.7 no.6
• /
• pp.35-44
• /
• 2006

Various geophysical methods and geological survey were applied for prospecting of geothermal resources and the attitude of volcanic body at northern part of Kumseongsan, Euiseong. They include magnetic, self-potential, radioactive and resistivity methods, temperature logging near the earth's surface and geological survey. The results of this study are summarized as follows. Various geophysical anomalies is related to the geologically Cretaceous conduit. Anomalies of resistivity and temperature logging seem to be related to the geological structure and terrestrial heat. Small radioactive and self-potential anomalies seem to be associated with chemical character of rocks. The sedimentary rocks dip steeply toward the volcanic rocks, aquifuge. Ideal geological structure for bearing ground water and geothermal resources was founded in the study area. The study area and the adjacent two hot springs area consist of Cretaceous sedimentary and volcanic rocks, and have similar geology.

• Economic and Environmental Geology
• /
• v.52 no.5
• /
• pp.471-484
• /
• 2019

Liquefaction occurs by a temporal loss of sediment strength as a consequence of increased pore water pressure during the re-arrangement of unconsolidated, granular sediments. Liquefaction is dependent on the physical properties of the sediments and cause surface cracks, landslide, and the formation of soft-sediment deformation structures(SSDS). SSDS is formed by the combined action of the driving force and deformation mechanism(liquefaction, thixotropy, and fluidization) that is triggered by endogenic or exogenic triggers. So research on the SSDS can unravel syndepositional geological events. If detailed sedimentologic analysis together with surrounding geological context suggest SSDS formed by earthquakes, the SSDS provide a clue to unravel syndepositional tectonic activities and detailed paleoseismological information(> Mw 5) including earthquakes that leave no surface expression.

• Journal of Advanced Navigation Technology
• /
• v.18 no.1
• /
• pp.67-73
• /
• 2014

Due to the development of the communication technology and the high-performance mobile device, the number of video streaming service user has been increasing. Video streaming services in the restricted network environments need error control to support users for the Ultra High Definition(UHD) video delivery. Packet-level FEC method was used to control the error for delay-sensitive video service, but it has a defect in huge occupation of network resources by redundant packets. In this paper, we proposed a packet-level FEC algorithm which maintains the video quality by previous FEC methods and also reduces the occupation of network resource in the restricted network environments. The proposed algorithm controls the redundant rate with using the delivery characteristic of the video coding technology, and improves the efficiency of network resources by reducing the traffic by around 33% in comparison with the previous FEC methods.

• Geophysics and Geophysical Exploration
• /
• v.25 no.1
• /
• pp.26-37
• /
• 2022

Recently, multiple methods using small aircraft for geophysical exploration have been suggested as a result of the development of information and communication technology. In this study, we introduce the hybrid unmanned aircraft electromagnetic system of the Korea Institute of Geosciences and Mineral resources, which is under development. Additionally, data processing and interpretation methods are suggested via the analysis of datasets obtained using the system under development to verify the system. Because the system uses a three-component receiver hanging from a drone, the effects of rotation on the obtained data are significant and were therefore corrected using a rotation matrix. During the survey, the heights of the source and the receiver and their offsets vary in real time and the measured data are contaminated with noise. The noise makes it difficult to interpret the data using the conventional method. Therefore, we developed a recurrent neural network (RNN) model to enable rapid predictions of the apparent resistivity using magnetic field data. Field data noise is included in the training datasets of the RNN model to improve its performance on noise-contaminated field data. Compared with the results of the electrical resistivity survey, the trained RNN model predicted similar apparent resistivities for the test field dataset.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.10 no.10
• /
• pp.1885-1890
• /
• 2006

Because of the rapid development of information technology and easiness in using internet, Web becomes indispensible utility in every day life and various information has been shared in internet. However, caused by the flood of information in the Web, the skill of acquiring required information with easy becomes one of the most urgent on utilizing internet. As a solution fur the requirement, Semantic Web, which upgrades present web technology by using semantic skills, has been researched actively ud Ontology is regarded as the basis of constructing semantic web system. The aim of this research is on developing agent using ontology skills for botanic resources. Moreover, the system can be used for developing and accumulating various resources effectively.

• Proceedings of the Korea Information Assurance Society Conference
• /
• 2004.05a
• /
• pp.119-124
• /
• 2004

The service oriented architecture (SOA) is gaining more momentum with the advent of Web services on internet. A programmable and machine accessible Web is the vision of many, and might represent a step towards the semantic Web. However, security is a crucial requirement for the serious usage and adoption of the Web services technology. This paper proposes design goals for an distributed access control model for CPC(Collaborative Product Commerce). It then design a processor model for CPC components, along with web services standard and concept that can be used as a basis to design an access control processor independent of a particular CPC service implementation.

• The Science & Technology
• /
• v.9 no.5 s.84
• /
• pp.51-54
• /
• 1976

과학과 기술이 발달하고 생활수준이 높아질수록 에너지의 소비량은 누증된다. 이 중에도 특히 열에너지는 대부분 석유나 석탄에 의존할 수 밖에 없는 것이 우리나라의 실정인 것이다. 우리나라의 에너지 총소비량 54.169억둔(1975년도 상공부 에너지개발과 발표)을 어떻게 얼마나 석유와 석탄으로 충당해 나갈 수 있느냐가 문제인 것이다. 석유파동으로 한번 큰 쇼크를 받었었다. 석탄의 매장량에도 한계가 있다. 여기서 이에 대체할 수 있는 방법이 없을까 해서 온 세계는 태양열발전을 서두루고 천연개스 발전 또는 지하석유자원발굴에 혈안이 되고 있다. 그런데 아직까지도 효율이 좋고 필요한 양을 자유로히 입수할 수 있는 석유등의 화석연료가 있기 때문에 새로운 연료자원의 개발이나 보급이 잘 안되는 원인의 하나였다 하겠다. 그러나 오늘날 점점 석유는 양적 한계와 제적이 심해질 뿐 아니라 언제또 공급에 제동이 걸릴지 모르고 격증하는 에너지를 보완하기 위해서는 새로운 에너지원의 개발을 서두루지 않으면 않되게 된 것이다. 자연자원중에서도 원료공급량이 풍부하고 비교적 간단한 시설로 얻어지는 메탄개스를 이용해보자는 계획이 지난 '69년도부터 산림녹화, 농촌연료해결, 환경개선등을 위해 정부시책의 일환으로 전국 농촌에 「메탄개스」이용을 관장해 왔다. 그러나 경제적부담이 힘겨운 농가사정과 시설상의 불합리, 관리의 불편등으로 호흥을 못받고 있는 실정이다. 여기서 이러한 여러가지 미비점을 과학적인 분석과 연구를 거듭하여 마침내 실용가능성을 보인 창원탱크 Co.(허범진씨)의 삼원식 메탄개스 발삼정화조라 하겠다.

• Economic and Environmental Geology
• /
• v.54 no.6
• /
• pp.753-765
• /
• 2021

The Dongwon Au-Ag deposit is located within the Paleozoic Taebaeksan province, Okcheon belt. Mineral paragenesis can be divided into two stages (stage I, ore-bearing quartz veins; stage II, barren carbonate veins) by major tectonic fracturing. Stage I, at which the precipitation of major ore minerals occurred, is further divided into three substages(early, middle and late) with paragenetic time based on minor fractures and discernible mineral assemblages: early, marked by deposition of pyrite with minor magnetite, pyrrhotite and arsenopyrite; middle, characterized by introduction of electrum and base-metal sulfides with minor sulfosalts; late, marked by argentite, Cu-As (and/or Sb) and Ag-Sb sulfosalts with base-metal sulfides. Fluid inclusion data show that stage I ore mineralization was deposited between initial high temperatures (≥430℃) and later lower temperatures (≤230℃) from fluids with salinities between 6.0 to 0.4 wt. percent equiv. NaCl. The relationship of salinity and homogenization temperature suggest that ore mineralization at Dongwon was deposited mainly due to fluid boiling, cooling and dilution via influx of cooler, more dilute meteoric waters. Changes in stage I vein mineralogy reflect decreasing temperature and fugacity of sulfur by evolution of the Dongwon hydrothermal system with increasing paragenetic time. The Dongwon deposit may represents a Korean-type and/or Au-Ag type mesothermal/epithermal gold-silver deposit.