• Proceedings of the KSRS Conference
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• 2007.03a
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• pp.177-182
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• 2007

한반도 주변해역에서의 해수면 고도는 1993년부터 2005년까지의 기간 동안 연평균 3.89 mm $yr^{-1}$ 상승하였으며， 이는 전세계 해수면 상승률의 1.3배에 해당한다. 본 연구에서는 AVISO (Archiving, Validation and Interpretation of Satellite Oceanographic data)에서 제공하는 복합위성자료 (Topex/Poseidon, Jason-1, ERS, Envisat)인 DT-MSLA (Delayed Time - Maps of Sea Level Anomalies)를 이용하여 동해와 황해, 남해, 한국해협에서의 해수면 고도 변화를 연구하였다. 해수면 고도의 평균적인 변화는 증가하는 경향을 보임과 동시에, 여름에는 $4{\sim}5$년，겨울에는 3년의 주기성을 가지고 진동하였다. 조화분석을 통하여 해수면 고도와 해수면 온도의 연주기 모드와 반년주기 모드의 진폭과 위상을 나타내었다. 해수면 고도의 연주기 진폭은 한반도 주변해역에서 남동쪽이 높게，북서쪽이 낮게 나타나는 반면, 해수면 온도는 이와는 반대의 분포를 보였다. 월별 해수면 고도와 해수면 온도의 상관을 구한 결과，$6{\sim}8$월에 동해와 남해에서 1 / 2달 시간지연 일 때，상관계수가 0.7정도로 높게 나타났다. 이러한 결과를 통해 여름철 동해와 남해가 쿠로시오 해류의 영향을 크게 받고 있음을 짐작할 수 있다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.18 no.9
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• pp.1090-1097
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• 2007

The multibeam surveillance radar is a state-of art of 3D radar technology. It applies the stacked beam-on-received realized by a digital beamformer. In this paper, a design concept of beamformer and a method of target altitude extraction for multibeam surveillance radar in the normal environmental condition considering no multipath situations are proposed and investigated. The extraction algorithm based on antenna sine space coordinated system in a FFT digital beamformer is described. The proposed algorithm is simulated by 1 look-up table data and confirmed to have consistent results in accordance with a variety of target altitudes and a full radar frequency range.

• Spatial Information Research
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• v.13 no.2 s.33
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• pp.167-183
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• 2005

Wetlands are a transitional zone between aquatic and terrestrial ecosystems, and a habit for the various biospheres. The main purpose of this study is to suggest a new technique that establishes the management districts of inland wetlands. To establish management districts of sub-watershed units, this study used the BurnDEM techniques. The management district resulted form this study are assessed its effectivity using an overlap of inland wetland map and sub-watershed maps classified by 18 sub-watershed. The result of this study could be applied to build a national inland wetland database.

• Korean Journal of Remote Sensing
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• v.34 no.3
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• pp.545-552
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• 2018

Grounding line is used as evidence of the mass balance showing the vulnerability of Antarctic glaciers and ice shelves. In this research, we utilized a high resolution digital elevation model of glacier surface derived by recently launched satellites to estimate the position of grounding line of Campbell Glacier in East Antarctica. TanDEM-X and TerraSAR-X data in single-pass interferometry mode were acquired on June 21, 2013 and September 10, 2016 and CryoSat-2 radar altimeter data were acquired within 15 days from the acquisition date of TanDEM-X. The datasets were combined to generate a high resolution digital elevation model which was used to estimate the grounding line position. During the 3 years of observation, there weren't any significant changes in grounding line position. Since the average density of ice used in estimating grounding line is not accurately known, the variations of the grounding line was analyzed with respect to the density of ice. There was a spatial difference from the grounding line estimated by DDInSAR whereas the estimated grounding line using the characteristics of the surface of the optical satellite images agreed well when the ice column density was about $880kg/m^3$. Although the reliability of the results depends on the vertical accuracy of the bathymetry in this study, the hydrostatic ice thickness has greater influence on the grounding line estimation.

• Monthly Duck's Village
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• v.62 no.8
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• pp.50-53
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• 2008

페킨종은 중국이 원산으로 미국과 영국에서 개량되어 현재 세계 각국에서 널리 사육되고 있는 난육겸용종의 대표적인 품종이다. 페킨종을 종자로 이용하여 육종한 육용개량 좋은 체구가 크고 발육도 빨라 현재 전세계에서 오리고기 생산용으로 많이 사육되고 있다. 페킨종 오리의 생산은 상업용 가금산업 중에서도 고도로 전문화된 분야이다. 종오리의 번식력은 육계나 산란계들 사이에서도 굉장히 높게 나타난다. 그러나 페킨종 오리의 경우 사육시 상당히 특별하고 흥미롭기 때문에 관리상의 필요한 점이 굉장히 많다.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2002.10a
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• pp.126-127
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• 2002

$\omega$-3계 고도 불포화 지방산은 이미 그 유용성이나 인체에 작용이 잘 알려져있다. $\omega$-3계의 대표적인 DHA와 EPA는 기능성 식품으로 자리를 인정받고 있다. DHA는 뇌조직을 구성하는 지질성분의 25%이상을 차지하며, 눈과 신경계에 필수 불가결한 성분으로 부족시는 이들의 기관에 장애를 초래하기도 한다. EPA는 동맥경화나 심장혈관 관련 질환에 그 예방효과가 있는 것으로 보고되고 있다. (중략)

• Vending industry
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• v.1 no.4 s.4
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• pp.40-53
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• 2002

지난 97년도를 기억하는 가. 그해 연말은 사상 초유의 IMF 부채국으로의 전락이라는 오욕과 뼈를 깎는 불황의 전주곡을 울렸던 해였기는 했지만, 아이러니컬하게도 자판기 산업은 사장 최대의 실적을 기록한 해다. 그러나 다음해인 98년부터 2000년까지는 시장성은 급락 직하하는 마이너스 성장기를 맞는다. 고도성장을 해 나가야 할 자판기 산업에 오히려 브레이크가 걸렸고, 지난 3년간의 통계조사 속에는 그러한 산업의 좌절과 아픔이 깊게 베어 있다. 하지만 산업계는 금번 2001년도 통계조사 분석 결과를 반갑게 받아들일 수 있게 됐다. 산업계는 온갖 어려움을 극복하고 마침내 산업 성장을 견인해 낸 것. 금호 기획특집에서는 성장세를 견인한 2001년 자판기 산업의 모든 것을 통계분석을 통해 대해부하는 시간을 마련했다

• Journal of Radiation Protection and Research
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• v.38 no.1
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• pp.44-51
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• 2013

ICRP recommended that cosmic ray exposure to the pilot and cabin crew would be considered as an occupational exposure due to their relatively high exposure. Since 2012 with the Act No. 10908 (Natural radiation management), the guideline of cosmic ray exposure to the pilot was established in Korea. The applicability of the solid-state nuclear track detector for personal dose assessment of pilot and cabin crew was evaluated. Dose linearity and angle dependence of dosimeters to the neutron were evaluated by $^{252}Cf$ neutron emitting source. The track density has a good agreement with the dose ($r^2$=0.99) and highly dependent on the degree of an angular of the dosimeter to the neutron source. In addition, the dosimeters (SSNTD) were exposed to cosmic ray in an aircraft during its cruising for more than two months in collaboration with Airline Pilots Association of Korea. Although the correlation between the track density from aircraft cruising altitude and expected neutron dose is low, however RSNS dosimeter could be used for personal neutron dosimeter. For application of RSNS as a personal dosimeter for pilot and cabin crew, additional studies are required.

• Clean Technology
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• v.17 no.3
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• pp.266-272
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• 2011

Anchovy oil was extracted using supercritical carbon dioxide ($SCO_2$) and organic solvents. Extraction was carried out at temperature range from 40 to $60^{\circ}C$, and pressure range from 15 to 25 MPa. The flow rate of $CO_2$ (22 $gmin^{-1}$) was constant entire the extraction period of 1.5 h. The fatty acid composition of anchovy oil was analyzed by gas chromatography (GC). The main fatty acids of anchovy oil were myristic acid, palmitic acid, stearic acid, palmitoleic acid, EPA (eicosapentaenoic acid), and DHA (docosahexaenoic acid). In addition, the oil obtained by $SCO_2$ extraction contained a higher percentage of polyunsaturated fatty acids especially EPA and DHA comparing to the organic solvent extracted oil. The oxidative stability of oils extracted from Anchovy by $SCO_2$ extraction was compared to those extracted by organic solvents. Results showed that the storage periods of oils obtained by $SCO_2$ extraction were longer than those of organic solvents extraction.

• Bulletin of the Korean Space Science Society
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• 2006.10a
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• pp.153-153
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• 2006