• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.261-261
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• 2017

최근 전 세계적으로 지구온난화로 인한 집중호우, 가뭄, 태풍 등 자연재해가 빈번하게 일어나고 있다. 이에 2016년 유엔기후변화협약당사국총회(COP22)에서는 지구온난화의 심각성을 인식하고, 한국의 2030년 온실가스 배출 전망치(BAU) 대비 37% 감축 달성과 같이 국가별로 온실가스 감축 목표를 선정하였다. 이를 달성하기 위해 국내에서는 현재까지 사용되지 않았던 자연에너지원의 활용이 부각되고 있으며, 특히 미활용에너지 중 하천수의 온도차에너지가 활발히 논의되고 있다. 하지만 미활용에너지 활용에 앞서 에너지원으로의 적정성 분석이 반드시 필요하다. 본 연구에서는 국내 5대강 중 한강권역을 대상으로 하천수 온도차에너지의 부존량 또는 이용가능량을 산정하고자 하였다. 한강본류 6개 하천유지유량 고시지점을 대상으로 해당 지점의 30년간(1987~2016년) 유량자료를 이용하여 유황 및 계절별 유량변동 특성을 분석하였고, 부존량 및 이용가능량을 검토하였다. 부존량 및 이용가능량 분석을 위해서는 선행 연구에서 적용된 하천유지유량, 하천수사용허가량 및 용수수요량 등을 고려한 산정식을 적용하였다. 본 연구는 미활용에너지인 하천수 온도차에너지의 실제 이용가능량을 분석하여 새로운 에너지원으로 활용할 수 있는지 평가하기 위해 수행되었다. 본 연구의 결과는 하천수 온도차에너지의 온실가스 감축을 위한 화석에너지의 대체에너지로서 새로운 가능성을 평가하는 지표가 될 것이라 기대된다. 또한 하천수 온도차에너지의 실제적인 적용을 위해서는 추후 연구를 통해 생태계 등 환경에 미치는 영향을 분석하고, 설치 및 유지비용에 따른 경제성 평가가 필요할 것으로 판단된다.

• 한국노년학
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• v.32 no.3
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• pp.913-926
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• 2012

The purpose of this study is to review Saeromaji Plan 2015 (the Second Basic Plan for the Low Fertility and Aging Society) with the framework of WHO's (2007) guidelines for building age-friendly cities and to provide suggestions for improvements in planning for the aging society. The contents of the Plan pertaining to the aging society sections were reviewed by two independent researchers to examine the extent to which the Plan fulfilled 169 checklists across 8 themes proposed by WHO. The results indicate that all 8 themes were partially reflected in the Plan. Suggested improvements for planning for the aging society include taking an inclusive approach to bring generations together, providing more options for older adults, and including more active involvement of the private sector in planning.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.19 no.6
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• pp.26-36
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• 2020

The use of existing macroscopic research of pedestrian behavior on the walking link as data is limited in determining an individual pedestrian's moving route and the level of service. In macroscopic studies, it is difficult to make quantitative indices, such as pedestrian flow rate, occupied space, density, and speed for determining the level of service on pedestrian roads. Therefore, the microscopic pedestrian route is required to establish appropriate pedestrian policies. In this study, the Yeok-Sam subway station network was examined using a micro-simulation VISSIM, which was then calibrated and validated statistically. The Pedestrian Road's Level of Service of Yeok-Sam subway station area was evaluated using the pedestrian speed as the evaluating index on the Korean highway capacity handbook.

• Analytical Science and Technology
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• v.34 no.3
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• pp.115-121
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• 2021

Ethyl glucuronide (EtG) and ethyl sulfate (EtS), which are ethanol metabolites, are direct indicators of ethanol intake; they have been studied in a variety of biological samples in forensic science. It is necessary to analyze ethanol metabolites to determine whether the ethanol detected in autopsy cases was due to alcohol consumption before death or due to the ethanol produced from post-mortem decay. In general, EtG and EtS are detected in the blood together with ethanol; however, it may be difficult to secure blood depending on the extent of decay. Therefore, the aforementioned method should be replaced by detecting the ethanol metabolites using tissue biological samples. In this study, we determined the optimal experimental conditions for detecting EtG and EtS from spleen samples using Liquid Chromatography - Tandem Mass Spectrometry (LC-MS/MS). Herein, the test method was validated, and an analysis method was applied to the actual autopsy cases.

• Journal of the Korean Institute of Gas
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• v.25 no.1
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• pp.30-39
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• 2021

Natural gas is globally emerging as an important energy source for environmental, political and regional reasons. In Korea, natural gas imported from oversea natural gas resources as a LNG, it is increased for an applications as a fuel and feedstock which replace the coal and nuclear energy. Because it is relied on the import market in Korea, it is very important to analyze the security for supply. Therefore, this study suggested a method for reducing supply risk and for providing stable supply and demand through risk analysis of Korea's import structure. In order to reduce the supply risk, the concentration of importing countries should be lowered and it is necessary to lower the proportion of countries with relatively low GSSI and increase the imports from Russia. Finally increasing the number of importing countries or maintaining friendly relations with countries where the supply is stable could give us the positive impact in terms of total GSSI.

• Journal of the Korean Association of Geographic Information Studies
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• v.25 no.2
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• pp.48-58
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• 2022

This study tried to assess the applicability of a hand-held LiDAR for measuring the geometric structures of forest trees including diameters at a breast height(DBH) and tree height(H). A traditional method using tapelines was conducted to analyze the accuracy of the LiDAR instrument in the Taebaeksan national park in South Korea. Four statistical indices which are bias, root mean square error, mean absolute error, and correlation coefficient were employed to compare the measurements by the LiDAR instrument and traditional method. The DBHs from the LiDAR were very similar to those from the traditional method. And it indicated that the LiDAR is sufficient to be a alternative of a traditional method. However, there was a limitation in assessing the accuracy of LiDAR for measuring tree height by comparing the measurements by observer's eyes since they included different error sources. Further study is needed to assess the accuracy of LiDAR instrument for tree height through more reliable measurements.

• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.81-81
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• 2023

농업용 저수지는 전체 수리답 면적 중 61.3%에 농업용수를 공급하고 있으며, 작물의 수확과 생산성을 위해 안정적인 물 공급이 요구된다. 수자원 분야에서는 물 공급 안정성 정도를 나타내는 지표로 이수안전도를 사용하고 있지만, 농업용 저수지는 기준의 부재로 10년에 1회 정도의 갈수를 기준으로 하는 설계기준인 10년 한발빈도를 대체하여 사용하고 있다. 농업용 저수지의 약 86%가 1940-1970년대에 축조되었으며, 기후변화에 따른 내한능력의 변화, 용수관리 및 수요량의 변화, 설계한발빈도 변화 등으로 현시점의 이수안전도 파악이 필요한 실정이다. 이수안전도는 물 부족량과 물 수요량을 활용한 양적기준 신뢰도와 물 부족 발생기간에 따른 시간기준 신뢰도로 산정하고 있다. 본 연구에서는 평야부 용배수계통을 고려하여 농업용 저수지의 양적 및 시간기준 신뢰도 관련 이수안전도 기준인 이수안전율과 공급신뢰율을 산정하고자 한다. 수요량 산정방법은 물수지 분석 모델인 수리수문설계시스템 (K-HAS, Hydraulics & Hydrology Analysis System)을 활용하여 물 부족량과 물 수요량 및 물 부족 발생기간 자료를 수집하고자 하며, 용배수계통을 고려하기 위해 수로 네트워크 적용 및 수리학적 용수공급 모의가 가능한 EPA-SWMM (United States Environmental Protection Agency Strom Water Management Model)을 통해 평야부 필지마다 물공급 만족정도를 비교하여 필요수량을 산정하고자 한다. 최대 부족량과 수요량으로 산정가능한 양적기준 신뢰도인 이수안전율과 물공급부족기간으로 산정가능한 시간기준 신뢰도인 공급신뢰율을 산정하여 비교하고, 해당 이수안전율과 공급신뢰율을 한발빈도로 환산하여 기존 설계한발빈도와 비교분석 하고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.11a
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• pp.1430-1433
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• 2010

삶의 지표가 상승함에 따라 선진국에서는 건강에 대한 관심도가 높아져 질병이 발생되기 전에 조기에 진단하여 예방하는 건강 패턴이 행해지고 있는 실정이다. 이와 같은 예방 분야를 반영한 것이 대체의학이며 이침 요법은 부작용이 적은 방법으로 널리 사용되고 있다. 이침 요법은 교육과정을 거친 후 자가 진단을 통해 응급처지가 가능한 것으로 실생활에서 손쉽게 이용되고 있다. 따라서 본 논문에서는 신장에 해당하는 이(耳)혈 상응점을 자극하여 신장과 관련된 음성 요소의 변화를 측정하였다. 이를 위해 신장 이혈 상응점을 자극하기 전과 후의 음성을 수집하여 음성 분석 요소 중 제 1 Formant Bandwidth와 Jitter, Shimmer값을 적용하여 비교, 분석하였다. 결과적으로 신장 이혈 상응점 자극에 의해 성대 진동의 변화율이 낮아져 발음의 정확성을 나타내는 결론을 도출하였다.

• Journal of Venture Innovation
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• v.5 no.2
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• pp.101-110
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• 2022

It is easy for first movers of platform business model to monopolize the market due to the platform's own characteristics such as network effect and flywheel strategy. Accordingly, the regulations on platform operators are constantly being discussed in the recent monopoly regulation arguments, but the concrete regulations have not been settled worldwide. This is because there is no clear consensus on the valuation method which can objectively identify dominant platform firms from the others. This study suggested a platform valuation method based on the Tobin's Q theory, by measuring the moderating effect of the existence of specific scale of platform on the relationship between replacement cost and market valuation. Our method can not only be a standard for settling monopoly regulation by converging the regulation targets, but also contribute to active investment on the new platform firms by evaluating their potential growths quantitatively.

• The Korean Journal of Nuclear Medicine
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• v.39 no.6
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• pp.430-437
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• 2005

Purpose: The objectives of this study were - First, to determine the normal range of left ventricular end diastolic volume (EDV), end systolic volume (ESV) and election fraction (EF) from gated myocardial perfusion SPECT for Quantitative Gated SPECT (QGS) and 4D-MSPECT (4DM), respectively. Second, to evaluate the relationships between values produced by both software packages. Materials & Methods: Tc-99m MIBI gated myocardial perfusion SPECT were performed for 77 patients (mean age: $49.6{\pm}13.7y$, n=37(M), 40(F)) with a low likelihood (<10%) of coronary artery disease (CAD) using dual head gamma camera (E.CAM, Siemens, USA). Left ventricular EDV, ESV and EF were automatically measured by means of QGS and 4DM, respectively. Results: in QGS, the mean EDV, ESV and EF for all patients were $78.2{\pm}25.2ml,\;27.4{\pm}12.9ml\;and\;66.6{\pm}8.0%$ at stress test respectively, not different from rest test (p>0.05). In 4DM, the mean EDV, ESV and EF for all patients were $89.1{\pm}26.4ml,\;29.1{\pm}12.8ml\;and\;68.5{\pm}6.7%$ at stress test. Most cases in 4DM, there was no significant difference statistically between stress and rest test (p>0.05). But statistically significant difference was found in EF ($68.5{\pm}6.7%$ at stress vs $70.9{\pm}8.0%$ at rest, p<0.05). Correlation coefficients between the methods for EDV, ESV and EF were comparatively high (0.95, 0.93, 0.71 at stress test and 0.95, 0.90, 0.69 at rest test, respectively). However, Bland-Altman plots showed a large range of the limit value of agreement for EDV, ESV and EF between both methods ($-30ml{\sim}10ml,\;-12ml{\sim}8ml,\;-14%{\sim}11%$ at stress test and $-32ml{\sim}5ml,\;-13ml{\sim}13ml,\;-18%{\sim}12%$ at rest test). Conclusion: We found the normal ranges of EDV, ESV and EF for patients with a low likelihood of CAD in both methods. We expect these values will be a good reference to interpret gated myocardial perfusion SPECT. Although good correlation was observed between both methods, they should not be used interchangeably. Therefore, when both programs are used at the same site, it will be important to apply normal limits specific to each method.