• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2012년도 학술발표회
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• pp.688-688
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• 2012

불확도의 요인은 유속-면적법에 적용되는 방정식의 일반화된 형태를 고려하여 나타낼 수 있다. 하천에 대한 불확도, 수심에 대한 불확도, 점 유속의 결정에 대한 불확도, 평균유속의 예측과 유량에 대한 불확도가 불확도산정에 많은 영향을 미치는 요소라 할 수 있다. 유량측정을 실시할 때 불확도를 개선하기 위해서는 유속에 비례하여 측선수를 조절함이 좋은 등급을 확보하기에 성과의 품질 향상에 크게 기여하는 결과를 얻을 수 있다. 본 연구에서는 자연하천의 현장지점에서 실시간 수위를 확인하며 유속을 측정하였고, 측정 성과를 이용하여 유량과 불확도를 산정, 비교 분석하였다. 유량측정에 있어 측정 기기로는 국내에서 일반적으로 사용되는 회전식 유속계(PriceAA)를 사용하여 측정을 실시하였으며, 측정방법으로는 도섭법을 기준으로 1점법, 2점법, 3점법에 이르게 다양한 성과를 실측하여 측정한 결과에 적용된 측선수에 따른 불확도를 분석하였다. 그 결과 0.5 m/s 이하의 유속과 $1.5m^3/s$ 의 유량에서는 그림 2에서 제시하였듯 30개 이상의 측선수를 확보하므로 5 % 미만의 2등급을 확보할 수 있었다. 그림 3은 9개의 지점 28회의 측정 결과를 측선수별 평균 불확도를 산정하여 유속 0.5m/s ~ 0.7m/s의 범위에서는 30개 미만의 측선수를 확보하여도 2등급의 품질을 확보할 수 있었으며, 이는 유속과 측선수의 관계를 나타내는 결과이다. 따라서 측정 자료의 신뢰성을 확보할 수 있는 2등급 이상을 얻기 위해서는 국제기준(ISO 748)에 따른 측선수를 적용하되 현장지점의 특성에 따라 유속을 고려한 측선수를 적용하는 것이 필요할 것으로 판단된다.

• 에너지공학
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• 제15권4호
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• pp.229-234
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• 2006

전기에너지는 저장성이 없기 때문에 부하의 불규칙적인 변화에 대한 실시간 대처가 어렵다. 그 중 전력 계통의 대규모 공급지장에 대비하여 안정적인 공급을 위해서 예비력을 운영하고 있다. 그러나 예비력을 운영함으로써 전력계통 전체에 경제적 손실이 발생하는데 이를 최소화하기 위해서는 적정예비력 확보와 적절한 가격보상이 필요하다. 본 논문에서는 예비력시장을 운영함으로써 발생하는 기회비용을 반영하여 에너지와 예비력 가격 설정방법을 제시하였다.

• The Journal of Asian Finance, Economics and Business
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• 제8권3호
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• pp.127-137
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• 2021

Mainland China area has been a long-term, major trade rival and partner of Taiwan, accounting for more than 40% of Taiwan's total annual trade exports, and so Sino-US trade friction is expected to have a significant impact on Taiwan's economy in the future. This study focuses on major bad news of Sino-US trade frictions and how it generates short-term shocks for Taiwan's equity market and fear sentiment. It further explores the mutual interpretation relationship between price changes such as VIX, Taiwan's stock market index, and the VIX ETF to identify which factors have information leadership as leading indicators. The study period covers 750 trading days from 2017/1/3 to 2020/1/31. This study finds that, when a policy news is announced, the stock market index falls significantly, the change in the trading price (net value) of the VIX ETF rises significantly, and the overprice rate significantly drops, but VIX does not, showing that fear sentiment exists in the Taiwan's market. The net value of the VIX ETF shows an information advantage as a leading indicator. This study suggests that, when the world's two largest economies clash over trade, the impact on Taiwan's equity market is inevitable, and that short-term fear effects will arise.

• 한국유기농업학회지
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• 제30권3호
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• pp.375-391
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• 2022

This study investigated the online transaction status of low-carbon certified fresh agricultural products and analyzed the low-carbon certified premium. For two months from March to April 2022, eight products (rice, apple, pear, sweet persimmons, paprika, tomatoes, cherry tomatoes, and lettuce) were surveyed at major online shopping malls. The low-carbon certification premium was analyzed using hedonic price analysis model. As a result of the online market survey, the low-carbon certified agricultural products were not traded in the case of rice, cherry tomatoes, and paprika. And the proportion of low-carbon certified agricultural products in the case of tomatoes and lettuce was low. As a result of the low-carbon premium analysis, of the five products that analyzed the low-carbon certification premium, four products excluding pear did not have a low-carbon certification premium. Thus, it is necessary to expand the sale of the low-carbon certified agricultural products by distributors, and various efforts to secure the premium of certified agricultural products are important.

• 무역학회지
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• 제47권1호
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• pp.115-130
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• 2022

In this study, I focus on analyzing how the effects of implementing ETS are different depending on whether Korean ETS linking with carbon markets in other countries. The global computable general equilibrium (CGE) model built in this study analyzes the chages in the production and trade of industrial sectors according to the international linkage of ETS compared to the reference scenario of emissions reduction targets and implementation of ETS. From the analysis of internatioanl linkage of carbon markets scenarios, Annex B countries-South Korea carbon market linkage with individual ETS in China worse the economic outcomes in South Korea the most. This means South Korea lose the international competitiveness compared to China in this scenario. On the other hand, Annex B-China carbon market linkage with Korean individual ETS implementation reduce the decreases in production and trading. The most effective way is to join a global emissions trading market with China. The results are consistent in most industries of South Korea. These results are caused by that the supply of emission allowance is increased and the price of emissions allowances is dropped by China's participation to the carbon market, which can be understood to reduce the carbon reduction cost for industrial sectors. In addition, it can be also concluded that the determinant of the negative impact of ETS on changes in production and trade is more sensitive to the price of emissions allowances than to the characteristics of production and trade structure.

• 소성∙가공
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• 제33권1호
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• pp.36-42
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• 2024

Additive manufacturing with 3XX austenitic stainless steels has been widely investigated during a decade due to its high strength, good corrosion resistance, and fair weldability. However, in recently, Ni price drastically increased due to the high demand of secondary battery for electric mobilities. Thus, it is essential to substitute the Ni with Mn for reducing stainless steels price. Meanwhile, the chemical composition changes in stainless steels not only affect to its properties but also change the optimal processing parameters during additive manufacturing. Therefore, it is necessary to optimize the processing parameters of each alloy for obtaining high-quality product using additive manufacturing. After processing optimization, mechanical properties and microstructure of the laser-powder bed fusion processed Fe-15Cr-7Ni-3Mn alloy were investigated in both room (298 K) and cryogenic (77 K) temperatures. Since the temperature reduction affects to the deformation mechanism transition, multi-scale microstructural characterization technique was conducted to reveal the deformation mechanism of each sample.

• 한국유기농업학회지
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• 제32권1호
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• pp.25-37
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• 2024

This study is to apply behavioral economics-an economics that studies actual human behavior based on cognitive psychology-to the farming decision-making process of onion and garlic farmers. Of behavioral economic theories, dual system theory and prospect theory (value function), heuristic and bias were surveyed and examined in the field. The reference point of farmers was farming experience of the previous year, and so they showed reference dependence and anchoring heuristic, not rational thinking on production cost plan. And they showed status quo bias that cultivated continuously the previous year or the present crop. This status quo bias is related to loss aversion propensity. Farmers did not usually change cultivating crops, in other words, they showed diminishing sensitivity-insensitive to those that the more revenue or loss was increased. This diminishing sensitivity is related to loss aversion propensity and status quo bias. Also, farmers had representativeness heuristic because they regarded auction price of Garakdong wholesale market as the standard price level despite various prices by production region. And farmers had the affect heuristic that they depended on producers' organization data more than the state-run research institute ones about cultivation intentions and actual situations.

• 대한지리학회지
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• 제40권3호
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• pp.296-309
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• 2005

본 연구는 공주지역의 지표변화를 분석하기 위해 우도비 기반의 베이지안 예측모델을 이용하여 지리공간 정보와 지표변화와의 연관성 및 미래의 지표변화를 탐지하였다. 지표변화 지역은 위성사진을 토지피복분류 한 후 선분류 후비교법을 이용하여 변화지역을 추출하였다. 지표변화와 관련이 있는 지리공간 정보는 GIS 환경에서 구축하였으며, 우도비를 이용하여 지표변화 예측도를 작성하였다. 분석결과, 도시지역 및 농업지역 지표변화에 가장 큰 영향을 미치는 주제도는 고도, 하계망, 인구밀도, 도로, 인구이동, 총사업체수, 지가 등이다. 또한 산림지역 지표변화에 영향을 미치는 주제도는 고도, 경사도, 인구밀도, 인구이동, 지가 등이다. 지표변화 분석결과, 도시지역은 금강을 중심으로 구도심과 신도심지역의 도시 확산이 이루어지고, 인터체인지 및 국도를 따라 시가화 지역이 확산 될 것으로 예측되었다. 농업지역은 금강의 소지류 및 인접지역과 연결되는 국도주변 지역이 변화가 일어날 확률이 높다. 산림지역은 대부분 남동쪽에 위치하고 있는데, 그 원인은 밤나무 재배단지가 본 지역에 넓게 나타나면서 산림훼손이 일어날 확률이 높은 것으로 예측되었다. 예측비율 곡선을 이용하여 검증한 결과, 지표변화가 일어날 확률이 가장 높은 상위 $10\%$지역에서 도시지역은 $80\%$, 농업지역은 $55\%$, 산림지역은 $40\%$정도의 예측능력을 보였다. 따라서, 본 통합 모델은 산림지역 예측에는 부적합한 것으로 볼 수 있어서, 향후 새로운 주제도 선정 및 예측모델 등이 필요하다. 결론적으로 본 방법은 향후 토지피복 변화 연구를 위한 효과적인 방법 중의 하나로 적용될 수 있을 것으로 기대된다.

• 복식
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• 제39권
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• pp.91-98
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• 1998

This paper is to study the development background of casual Korean clothes through the consideration of the style change of traditional clothes. The purpose of this study is to present the method for the settlement of casual Koran clothes as everyday clothes and to present the direction which casual Koran clothes follow in the future. The development. The development backgrounds of casual Korean clothes are as followings. 1) the self-awakening for the importance of national culture. 2) practical aspects 3) the change of life style accompanied with economic growth 4) the development of mass media Casual Korean clothes in the future should be studied and developed in following aspects. 1) practical aspects by developing design for easy activity 2) environmental aspects by natural dyeing which is harmless to human body and the nature 3) emotional aspects by regarding traditional beauty as importance 4) color sense aspects according to scarcity of as form change of the Korean clothes 5) production aspects by mass production of ready-made clothes not order clothes 6) diplomatic aspects as folk costume which is corresponding with international trend 7) scientific aspects by developing many patterns according to various bodies 8) economic aspects by low price through the mass cultivation of natural materials 9) fashionable aspects by subdividing traditional clothes to ceremonial clothes, everyday clothes, working clothes.

• 유통과학연구
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• 제16권10호
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• pp.55-64
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• 2018

Purpose - The most important goal of corporate management is the maximization of firm value in the market. Executives of companies are making effort to increase corporate value and initiate various management strategies, which is to develop the products or service with value. Through these efforts, consumer satisfaction grows and loyalty increases, which leads to the positive change of customer satisfaction index. The purpose of this research is to find out the abnormal return after the KCSI(Korean Customer Satisfaction Index) is announced. Research design, data, and methodology - This research data is collected from 11 years' stock price in KOSPI market and KCSI. The authors analyze the abnormal return triggered by the announcement of KCSI through the event study. Results - First, newly enlisted companies in the KCSI show statistically significant short-term abnormal rate of return. Second, the value of the customer satisfaction index is not the level of customer satisfaction but the direction of the change in the CSI. Conclusion - Customer satisfaction has the important intangible asset in the marketing area. However, firms' investment for CS is not an easy decision, because of the difficulty to measure the effect on corporate market value. This research investigates the change of the market value after the announcement of KCSI. Based on the results, firms have to keep trying to increase KCSI relative to the previous year. And the small company has to struggle for being newly listed in the KCSI.