• 한국산학기술학회논문지
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• 제16권10호
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• pp.7089-7097
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• 2015

본 논문에서는 4대강 살리기 사업이 수행된 낙동강의 하상변동 양상을 해석하기 위해 과거 장기 모니터링 자료를 활용한 하상변동 분석을 수행하였다. 또한 4대강 살리기 사업 후 가장 큰 하상변동이 관측된 구간을 대상으로 향후 발생할 수 있는 장기 하상변동을 1차원 하상변동모형을 구축하여 예측하였다. 유입유사량 조건 및 유사이송공식에 따른 하상변동 예측 결과 값의 민감도 분석을 수행하였으며 단기 모니터링 실측자료와 하상변동 모의결과 값을 비교하여 모형 보정을 수행한 후 10년 장기 하상변동을 예측하였다. 모니터링 자료 분석 결과, 4대강 창녕 함안보-합천 창녕보 구간에서 전반적으로 가장 큰 최심하상고 변화가 나타났다. 1차원 하상변동 모형을 활용한 10년 동안의 장기 하상변동 수치모의에서는 창녕 함안보와 합천 창녕보 구간에서 구간별로 최대 2.07 m에서 3.26 m의 유사 퇴적이 발생하는 것으로 나타났다.

• 수산경영론집
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• 제52권2호
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• pp.55-67
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• 2021

Global warming affects critical natural resources, one of which is the oceans that occupy 70% of the total cover of the earth. In other words, ocean warming is a subset of global warming which needs to be addressed urgently. Purple laver (pyropia spp.) is one of the most vulnerable items to climate change although it is a major export product of Korean fisheries. The purpose of this study is to analyze the causality of how climate change caused by global warming affects the increase or decrease of PLP (purple laver production). The target area for analysis was set to Maro-hae between Jindo-gun and Haenam-gun. We selected marine environmental factors and meteorologic factors that could affect PLP as variables, as well as co-integration tests to determine long-term balance, and the Granger causticity tests. As a result, PLP and marine environmental factors WT (water temperature), pH, and DO confirmed that long-term equilibrium relationships were established, respectively. However, there is only causality with WT and it is confirmed that there is only a correlation between pH and DO (dissolved oxygen). There was no long-term equilibrium relationship between PLP and HDD (heating degree days) and there is a causal effect that HDD affects PLP; however, it was less clear than that of WT. The relationship between PLP and RF (rainfall), WS (wind speed), SS (percentage of sunshine), and FF (farm facilities) was all balanced in the long term, and causality exists. Based on the results of the analysis, policy proposals were made.

• 대기
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• 제31권5호
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• pp.553-562
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• 2021

The long-term trend of surface wind speed in Korea is estimated by correcting wind measurements at 29 KMA weather stations from 1985 to 2019 with physical and statistical homogenization. The anemometer height changes at each station are first adjusted by applying physical homogenization using the power-law wind profile. The statistical homogenization is then applied to the adjusted data. A standard normal homogeneity test (SNHT) is particularly utilized. Approximately 40% of inhomogeneities detected by the SNHT match with the sea-level-height change of each station, indicating that an SNHT is an effective technique for reconciling data inhomogeneity. The long-term trends are compared with homogenized data. Statistically significant negative trends are observed along the coast, while insignificant trends are dominant inland. The mean trend, averaged over all stations, is -0.03 ± 0.07 m s^-1 decade^-1. This insignificant trend is due to a trend change across 2001. A decreasing trend of -0.10 m s^-1 decade^-1 reverses to an increasing trend of 0.03 m s^-1 decade^-1 from 2001. This trend change is consistent with mid-latitude wind change in the Northern hemisphere, indicating that the long-term trend of surface wind speed in Korea is partly determined by large-scale atmospheric circulation.

• 한국노년학
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• 제31권4호
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• pp.999-1014
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• 2011

본 연구의 목적은 생태체계이론을 적용하여 노인장기요양보험제도라는 거시체계가 가족관계라는 미시체계에 미치는 영향을 살펴보는 것이다. 이를 위해 『한국복지패널(KWPS: Korean Welfare Panel Study)』 2차년도(2007년)와 4차년도(2009년) 데이터를 활용하여 노인장기요양보험제도의 이용자 및 그 가구원(실험집단)과 비이용자 및 그 가구원(통제집단)으로 구분한 후, 노인장기요양보험제도 이용 전후의 가족관계의 변화를 살펴보았다. 이중차이모델(difference-in-difference model) 분석결과, 생태체계이론은 노인장기요양보험제도와 가족관계를 설명하는 이론이라고 할 수 있다. 주목할만하며 새로운 발견은 우리나라의 노인장기요양보험제도가 소득 효과(income effect)가 아닌 독립효과(independent effect)를 갖는다는 것이다. 이러한 결과는 무엇보다도 점점 더 가족의 의미가 퇴색되어 가족관계가 약화되고 있기 때문이다. 또한 한국의 노인장기요양보험제도가 사회보험으로서의 특징을 온전히 갖추지 못하였기 때문으로 추정된다. 노인장기요양보험은 제도의 포괄성, 급여대상의 보편성, 급여의 적절성, 서비스 접근성 측면에서의 제도개선이 필요하며, 가족친화적 사회복지제도로의 변모가 절실히 요청된다.

• 환경정책연구
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• 제14권3호
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• pp.21-40
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• 2015

폭염은 과거 하절기에도 있어 왔던 현상이나, 최근 기후변화로 인하여 발생빈도 및 강도가 심화되고 폭염 발생시기의 불확실성이 가중됨에 따라 그 피해는 더욱 커지고 있다. 이에 폭염 대응은 폭염 발생 후 대응뿐만 아니라 사전에 그 피해를 예방할 수 있도록 중장기적 차원의 접근이 요구된다고 할 수 있다. 이에 국내 폭염 대응은 현재의 폭염에 대응하는 단기적인 대책에 미래 기후변화를 고려한 사전 예방적 차원의 관련 분야를 망라하는 포괄적 대책, 그리고 이를 중장기적으로 관리함으로써 수정 보완해가는 대책으로 수립되어야 한다. 국내 폭염으로 인한 피해 및 이에 대한 현재의 국내 폭염 대책을 고찰하고 대책통합과 적응관리의 프레임워크를 적용하여 기후변화를 고려한 폭염 대응의 중장기적 적응대책 수립 관리 방안을 제시하였다.

• 한국연초학회지
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• 제14권1호
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• pp.57-65
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• 1992

The quality of cut tobacco will be deteriorated due to weather conditions such as temperature and relative humidity, when shipping and long term storaging. The change of equilibrium moisture contents in cut tobacco were under influence of relative humidity and temperature but not humectants. Therefore internal packing materials are necessary for cut tobacco to maintain initial quality, including taste, flavour and musty smell during shipping or storaging. When packing cut tobacco for shipping or long term storaging, desiralbe packing density was 200/$m^2$, For the long term storage under R.H 90% and 3$0^{\circ}C$, polyethylene film thickness suitable for packing material are above 100$\mu$, which resulted in 42days of shelf life.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2009년도 제38회 동계학술대회 초록집
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• pp.320-320
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• 2010

The dye-sensitized solar cells (DSSCs) have achieved so far the highest validated efficiency over 11%. However, the cells with the best performance utilize volatile solvent as a electrolyte, which can cause some practical limitations for the long-term operation. This is one of the most substantial problems to be resolved for the commercialization of DSSCs. In order to improve the long-term stability, many research groups have reported new electrolyte system, to replace the liquid type electrolyte by non-volatile ones. In this work, we studied long-term stability of the DSSCs with various types of electrolytes such as (PVDF HFP) based polymer, eutectic melts of ionic liquids, and liquid based solvent. The cells with various electrolytes have been exposed to the condition under thermal stress and illumination over 1000 hours. We will report the change of photovoltaic properties with time and investigate the degradation mechanism with the impedance spectroscopic analysis.

• 한국해양공학회지
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• 제21권4호
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• pp.15-20
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• 2007

The harbor siltation by longshore sediment transports has become a serious problem on the East Coast of Korea. A reasonable prediction of the longshore sediment rate is important to approach the siltation problem effectively. In the recently developed 1-line model, the empirical constants of the sediment transport formula, which include the absolute quantity of sediment transport rate and the spatial distribution of breaking wave height by wave deformation, are treated as calibration parameters. Since these constants should be determined by the very long-term shoreline data, the longshore sediment rates are much more reasonable values. The method was applied to Hupo Beach, which has experienced heavy siltation. The authors also discuss long-term shoreline change using aerial photos and the observed wave-induced current patterns. According to the result, the SW-direction sediment transport rate was $146,892m^3/year$, and the NE direction was $2,694,450m^3/year$ at Hupo Beach for the last 11 years. The siltation in Hupo Harbor might be affected by the NE-direction sediment transport from Hupo Beach.

• 보건의료산업학회지
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• 제5권3호
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• pp.13-23
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• 2011

This paper investigated the operating environment for the representative of each agency and the facility workers on the basis of analytical result of recognition changes of the operating environment changes under the operating the long-term care insurance. It was described plans to take positive effect on the operating as follows. The first, on the result of regression analysis, the service administrative range takes the biggest effect on the general recognition of executing the long-term care insurance off and on. The affirmative recognition of the service administrative range had the general recognition on the system be positive effect. But the operator of facility asserts that the care manager's professionalism related quality of service be strengthened. The second, on the result of regression analysis, in the financial accounting administrative it is revealed the more positive recognition it is, the more positive effects it has. From the difference verification of an operation size from operation subject, the small operation size and personal facility recognize the long term care insurance positively. On the other side the facilities where the operation size is big recognize the system negatively. The long-term care facility should rearrange a support program newly and the government needs to promote the donation activity, because it is needed to reduce the financial burden of facilities.

• 전기학회논문지
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• 제59권9호
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• pp.1581-1586
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• 2010

Korea Power Exchange has successfully performed the Long-term Electricity Demand Forecasting. Recently there is a lot of change in electricity industry sector; the national master-plan for green gas emission reducing, rise of smart-grid, and new trend of electricity consumption, and it is becoming painful challenging for demand forecasting. In new circumstance the demand forecasting is required more flexible and more accurate.