• Ecology and Resilient Infrastructure
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• v.2 no.4
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• pp.324-329
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• 2015

For the restoration of lateral connectivity between rivers and floodplains, it is important to find the isolated former floodplain (IFF) and to characterize its land use in Korean rivers which were channelized by levee constructions for flood protection. The aim of this study is to map the IFF and to assess its land use pattern in the Nakdong River, Korea. The isolated former floodplain was explored by being overlapped on a digital elevation model (DEM), digital topographic map and design flood level using a geographical information system (GIS) in the Nakdong River basin. The land use of the identified IFF was classified by land-use map. The total number of IFFs was 384 and their total area was $291km^2$. While IFFs were usually surrounded by mountain forest in the upper river area, they tended to be located on wide plain areas in the downstream area of Nakdong River. The land use pattern of IFFs was mostly farmland (73.9%) and urban areas (12.7%) in the river. The results of delineation and land use analysis of isolated former floodplain in the Nakdong River will be used as a base line data for planning stream restoration.

• Journal of Chest Surgery
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• v.31 no.12
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• pp.1206-1211
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• 1998

Background: Pulmonary sequestration is not common and it's diagnosis needs special care such as an aortogram ar tomography. Material and Method: We have experienced 13 patients who had pulmonary sequestration from January 1990 to September 1997. Result: Six men and seven women were treated and their mean age was 25.8±14.3 years. Their chief complaints were coughing, chest pain, and no symptoms in decreasing order. There were nine intralobar(ILS) and three extralobar(ELS) pulmonary sequestrations and one patient had both. There was no preference in location of either left or right. They were mainly diagnosed by aortography and their feeding arteries commonly originated from the lower thoracic aorta. The patients with ILS were treated by lobectomy and those with ELS by sequestrectomy. Conclusion: to treat pulmonary sequestration properhy, aortogram or chest CT is warranted to iidenty the abnormal origin of feeding artery.

• Fire Science and Engineering
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• v.32 no.3
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• pp.116-122
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• 2018

In Chemical, Biological, Radiological and Nuclear (CBRN) disaster, integrated and optimized equipment package including stretcher, isolation unit, patient monitoring and treatment equipment is essential to achieve proper treatment and prevent secondary contamination. The purpose of this study was to evaluate the efficiency and ease of use of integrated CBRN disaster equipment package for disaster medical response. This study was a randomized crossover study using a manikin simulation for emergency medical technitian (EMT). All participants used the existing devices and prototype of integrated CBRN disaster equipment package alternately. Efficiency was measured by time from vital sign change to detection or treatment application. Ease was use was measured by questionnaires for each patient monitor, stretcher care and isolation unit. 12 EMTs were enrolled. hypoxia-detection time of integrated equipment group was significantly shorter than existing equipment group (4.9 s (3.8-3.9) vs 3.5 s (2.5-3.9), p < 0.05). There was decreasing tendency of ECG change detection and facial mask oxygen supply but no statistical significance was observed. Overall satisfaction of patient monitoring device in integrated equipment group was significantly higher than existing devices (4(3.5-5) vs 3(3-3), p < 0.05). The use of integrated CBRN disaster equipment package shortened the hypoxia detection time and improved usability of vital sign monitor compared to existing devices.

• Journal of the Korea Society for Simulation
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• v.22 no.4
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• pp.93-98
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• 2013

In this paper, the proposed shallow trench isolation structures for high threshold voltage for very large scale and ultra high voltage integrated circuits MOSFET were simulated. Physically based models of hot-carrier stress and dielectric enhanced field of thermal damage have been incorporated into a TCAD tool with the aim of investigating the electrical degradation in integrated devices over an extended range of stress biases and ambient temperatures. As a simulation results, shallow trench structure were intended to be electric functions of passive, as device dimensions shrink, the electrical characteristics influence of proposed STI structures on the transistor applications become stronger the potential difference electric field and saturation threshold voltage.

• Journal of the Mineralogical Society of Korea
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• v.16 no.2
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• pp.171-180
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• 2003

The objective of this study is to investigate biogeochemical processes to sequester $CO_2$and metals utilizing metal-rich fly ash (MRFA). Microbial conversion of $CO_2$into sparingly soluble carbonate minerals has been studied using MRFA under different $pCO_2$and different bicarbonate concentrations. Scaling from test tube to fermentation vessels (up to 4-L) using metal-reducing bacteria and MRFA has proved successful at sequestering carbon dioxide and metals. $CO_2$sequestration via precipitation processes using MRFA may complement the process of $CO_2$capture from fossil fuel plants while potentially stabilizing fly ash wastes.

• The Journal of the Acoustical Society of Korea
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• v.20 no.3
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• pp.83-90
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• 2001

Conventional SAW duplexer filters employ a 1/4 wavelength transmission line, which causes difficulty in fabrication of the strip line on the package. Its manufacturing process is also complicated, because it needs integrating process of the separate transmitting filter, receiving filter and isolation circuits. This paper concerns development of a new structure of the duplexer filter that has all the transmitting filter, the receiving filter and the isolation circuit as a one chip device. For composition of the duplexer, we design the component SAW ladder filters and the isolation network consisting of lumped inductor and capacitor elements. Performance of the whole duplexer is optimized by the nonlinear multivariable minimization of a proper target function, and the result is compared with that of commercial filters.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.7 no.2
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• pp.43-49
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• 2008

In this paper, new directional couplers for T/R switch of UHF RFID applications are proposed to overcome TX-to-RX leakage problem. The proposed method can remove TX-to-RX leakage caused by both imperfect isolation characteristic of the conventional directional coupler and the mismatch of antenna impedance. Two directional couplers are implemented using distributed elements and lumped elements respectively for the verification. The varactor tuneable circuits for compensation of the antenna mismatch is also proposed. The measurement result shows excellent TX-to-RX leakage suppression, more than 45dB in 910MHz.

• The Korean Journal of Zoology
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• v.35 no.2
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• pp.211-218
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• 1992

한국산 노랑초파리 군에 속하는 8종의 유전적 유연관계를 밝히고자 생식적 격리 그리고 수용성 단백질을 전기영동법으로 분석하였다. 생리적 격리 실험에서 교배전격리 실험결과를 Watanane와 Kawanishi model에 근거하여 보면 D. aurario complex 3종 중 D. triauror물가 원시종이며 남 auraria는 팍생종으로 나타났다. 교배후 격리 실험에서 나. melonogaster와 D. simuions의 교배시, D. melonogoster를 수컷으로 하였을 때는 불임의 수컷만이, 또 D. melonogaster를 암컷으로 곯였을 때는 불임의 암컷만이 출현하였다. 그리고 남 ouraria complex 3종간의 교배에서는 수정 능력이 있는 수컷과 암컷이 출현하였는데, 이는 아직 남 auraria Complex가 semispecies단계에 있음을 나타내는 것이라 할 수 있다. SDS-PAGE로 분석한 노랑초파리 군 8종의 band pattern을 densitometer로 scanning한 결과 남 susu상가 가장 특이하였으며, TDE에 의한 유전적 거리(Aquadro and Avise's)는 남 auror지와 봉 triauror지사이가 0.155로 가장 낮았고, D. melonogaster와 고. mfa 사이가 0.422로 가장 높았다. 본 연구의 결과를 UPGMA법 뜨로 분석하면, 한국산 노랑초파리 군 8종은 4개의 아군으로 나뉘어지며 이들은 2개의 다른 큰무리로 구분되었는데, D. suzu가기 아군, D. lutescens의 아군, D. melanogoster와 봉 simulons의 아군이 속한 큰무리와, D. mfa,0. ouroria, D. biauroria 그리고 남 triourario가 속한 다른 큰무리로 나눌 수 있다.

• Journal of the Earthquake Engineering Society of Korea
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• v.8 no.2
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• pp.9-17
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• 2004

The seismic performance evaluation and retrofit process are very important in old existing bridges. If the result is not appropriate. then a retrofit process are required. Among various retrofit methods, the seismic isolation is a very useful method. because it can be applied by replacing old bridge bearings. In this study, the effectiveness of seismic isolation is rationally verified. For this purpose, two seismic isolations used widely are selected and non-linear static and dynamic analyses are performed. The responses of existing bridges are compared with those of retrofited bridges by seismic isolation bridge for earthquake of target level. and seismic performances are evaluated.

• Journal of the Korean Society of Propulsion Engineers
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• v.20 no.4
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• pp.87-93
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• 2016

In a Direct Connect(DC) mode altitude engine test, a labyrinth seal is set up between an air intake duct and an engine. The labyrinth seal plays a key role in mechanically isolating them, which contributes to the accurate measurement of thrust and the other component forces. However, when high vertical temperature gradient is generated in the supplied air in the duct, the isolation breaks down. In this paper, a labyrinth seal control device is designed and installed in an effort to eliminate the issue. Test result shows the device successfully gets rid of the contact problem even when high vertical temperature gradient is produced.