• 한국농공학회지
• /
• 제41권6호
• /
• pp.33-43
• /
• 1999

Drought is a serious diaster in agriculutre, especially to upland crops. Hence, the Agricultural Drought Analysis Model (ADAM) that is integratable with GIS was applied to analyae agriculture drought in upland. ADAM is composed of two sub-models , one is a Soil Water Balance Model (SWBM) and the other is a Drougth Analysis Model (DAM) that is based on the Runs theory. The ADAM needs weather data, rainfall data and soil physical characteristics data as input and calculates daily soil moisture contents. GIS was integrated to the ADAM for the calculation of regional soil moisture using digitized landuse map, detaile dsoil map, thiessen network and district boundary . For the agriculutral drought analysis, the ADAM adapt the Runs theory for analyzing drought duration, severity and magnitude . Log-Pearson Type-III probability distribution function and Kolmogorov-Smirnov test were used to test the fitness of good of the model. The integration of ADAM with GIS was successfully implemented and would be operated effectively for the regional drought analysis.

• 한국농공학회논문집
• /
• 제48권6호
• /
• pp.3-13
• /
• 2006

Although the drought impacts are comparably not catastrophic, the results from the drought are fatal in various social and economical aspects. Different from other natural hazards including floods, drought advances slowly and spreads widely, so that the preparedness is quite important and effective to mitigate the impacts from drought. Soil moisture depletion directly resulted from rainfall shortage is highly related with drought, especially for crops and vegetations, therefore a drought can be evaluated using soil moisture conditions. In this study, SMI (Soil Moisture Index) was developed to measure a drought condition using soil moisture model and frequency analysis for return periods. Runs theory was applied to quantify the soil moisture depletions for the drought condition in terms of severity, magnitude and duration. In 1994, 1995, 2000, and 2001, Korea had experienced several severe droughts, so the SMI developed was applied to evaluate applicability in the mid-range hydrologic unit watershed scale. From the results, SMI demonstrated the drought conditions with a quite sensitive manner and can be used as an indicator to measure a drought condition.

• 한국농공학회논문집
• /
• 제55권3호
• /
• pp.13-24
• /
• 2013

Agriculture is affected directly by climate conditions and changes, and it is necessary to understand the impact of climate change on agricultural reservoirs which are the main water resources for paddy fields in Korea. This study aimed to evaluate the impact of climate change on the anti-drought capacity including water supply capability (WSC) and drought response ability (DRA) of agricultural reservoirs based on RCP (Representative Concentration Pathway) 4.5 and 8.5 scenarios of CanESM2 (The Second Generation Earth System Model) provided by CCCma (Canadian Center for Climate Modeling and Analysis). The WSC and DRA were estimated using frequency analysis and runs theory. The six reservoirs (Yooshin, Nogok, Kumsung, Songgok, Gapyung, Seoma) were selected considering geographical characteristics and design criteria of reservoir capacity. In case of Seoma reservoir, more than 10 year drought return period (DRP), the variation of the WSC was estimated larger than the others. In case of Yooshin reservior (2~5 DRP) DRC was decreased in 2025s under RCP8.5. These results could be utilized for agricultural reservoirs management and future design criteria considering climate change impacts on paddy irrigation.

• 한국인구학
• /
• 제8권2호
• /
• pp.30-45
• /
• 1985

The "Dismal Theorem" (Essay) of Maithus is juxtaposed to the utopianism of both Marquis de Condorcet and of William Godwin who believed in the perfectibility of man and of the greater power of civilization over that of population. The socio-political environment that gave birth to the neo-Maltbusianism and of the economic Malthusianism is briefly sketched on, along with the discrepancy between the early theories (1978) of Malthus and the later Malthusian theory; nemely, the biological population principles of his early period runs head-on into his theory of effective demand and underconsumption. Malthus belonged to both the anti-Ricardian and the Ricardian classical tradition, and his attempt to reconcile the anomalies was not very satisfactory. Karl Marx criticized Malthus for his incon-sistent radical conservative theory of population and John Maynard Keynes came to the rescue of this Maltbusian dilemma in the 1930's, with but a morsel of success.f success.

• 지식경영연구
• /
• 제17권4호
• /
• pp.129-145
• /
• 2016

Nowadays, owing to the diffusion of smartphones and the growth of social networking services (SNS), the number of people who share their life with other SNS users by posting photos is increasing. The number of Instagram users has been particularly increasing since Instagram started its service in 2010. Compared to other SNS such as Facebook and Twitter, Instagram runs its service by focusing solely on photos, which is a major differentiation factor compared with other existing SNS. Previous studies, however, do not examine SNS that focus on photo sharing adequately. Therefore, we establish a hypothesis relating to the motivations behind a user's photo sharing attitude and posting intention through Instagram. Moreover, this will be achieved by employing TRA(Theory of Reasoned Action) and focusing on intrinsic and extrinsic motivations. The analysis results show that intrinsic motivation influences a user's sharing attitude and subjective norms. Apart from this, Instagram's expressivity influences a user's photo sharing attitude and posting intention.

• 한국수자원학회논문집
• /
• 제32권2호
• /
• pp.197-210
• /
• 1999

본 연구는 추계학적 과정을 고려함으로써 연유출의 핵심적 통계치를 한발 확률 분포에 관련된 통계치로 유도하는데 사용하여 재현 기간과 물 수요의 다양한 조합에 대하여 한발 기간과 누가부족유출량을 산정함으로써 한발의 심각성을 검토하였다. 초기 단계에선는 기록기간, 기록의 질을 특정 기준에 적합한 것으로 판정된 우리 나라의 하천 관측 기록의 분석을 실시하고 분석에 의하여 선택된 하천의 연속 한발에 대한 추계학적 형태를 정의하는데 필요한 연유량을 결정하였다. 앞의 연구 결과를 사용하여 연속 이론을 적용함으로써 실제 또는 추정된 연유량 통계치를 최대 한발 사상의 확률 분포와 연관시켰다. 이 결과로 계측 지점에서의 한발 사상에 재현 기간을 부여할 수 있었으며 한발 기록의 확률 평가가 가능하였다.

• The Journal of Asian Finance, Economics and Business
• /
• 제9권9호
• /
• pp.1-8
• /
• 2022

This paper studies market efficiency from a weak form aspect using opening and closing prices of the Shanghai stock exchange composite index (SSEC) and Shenzhen stock exchange composite index (SZSEC) under the expected return theory. Classical methods (autocorrelation and runs test) are used to examine the features of stock returns, and little evidence against mutual independence of returns is found. We predict daily returns of SSEC and SZSEC with AR(p) and VAR(p) models (in this paper, p = 5 is taken as a one-week lag) and perform a virtual experiment on two indexes based on the predicted value of daily returns from AR(p) or VAR(p) model. From the results of AR(p) and VAR(p) for two indexes, we attempt to find out how the market efficiency level changes when the information from the other market is under consideration as we check the market efficiency level in one market. We find that SSEC in 2014-2016 and SZSEC in 2015-2016 are inefficient from the result of autocorrelation, that SSEC in 2016 and SZSEC in 2013 are not efficient from the result of runs test, that the stock market is efficient except 2005, 2009, 2010 and 2017 in SSEC and 2005, 2016 and 2017 in SZSEC and that SSEC is more influenced by SZSEC but SSEC influences SZSEC less from the result of the virtual experiment.

• ETRI Journal
• /
• 제25권5호
• /
• pp.401-406
• /
• 2003

A biometric system determines the identity of a person by measuring physical features that can distinguish that person from others. Since biometric features have many variations and can be easily corrupted by noises and deformations, it is necessary to apply machine learning techniques to treat the data. When applying the conventional machine learning methods in designing a specific biometric system, however, one first runs into the difficulty of collecting sufficient data for each person to be registered to the system. In addition, there can be an almost infinite number of variations of non-registered data. Therefore, it is difficult to analyze and predict the distributional properties of real data that are essential for the system to deal with in practical applications. These difficulties require a new framework of identification and verification that is appropriate and efficient for the specific situations of biometric systems. As a preliminary solution, this paper proposes a simple but theoretically well-defined method based on a statistical test theory. Our computational experiments on real-world data show that the proposed method has potential for coping with the actual difficulties in biometrics.

• 철학연구
• /
• 제143권
• /
• pp.165-188
• /
• 2017

브레이부르크(1976)와 소벨(1976)에 따르면, 전통적인 사회계약론의 두 전제, 즉 투쟁적 자연상태라는 '상황'과 타인의 복지에 대해 무관심하고 자기 이익을 추구하는 합리적 개인이라는 '동기'의 두 가정 하에서는 계약의 성립과 준수는 불가능하다. 소위 '사회계약론의 문제'로 불리는 이 문제는 현대 사회계약론에도 유전된다. 그렇다면 현대 사회계약론은 이 문제를 해결하고 있는가? 이 논문은 전통적 사회계약론의 문제에 대한 현대 사회계약론의 해법에 '상황'과 '동기'가 어떻게 순환함으로서 선결문제를 요구하는지 분석한다. 그리고 현대 계약론에서 나타나는 순환을 벗어나기 위해서 사회계약론이 자연화 될 필요성을 관습주의를 참고하여 논변한다.

• 대한예방한의학회지
• /
• 제1권1호
• /
• pp.105-117
• /
• 1997

The result of this paper runs as follows: 1. The theory of preclinic phase (=mibyung) was scientifically completed as one basic philosophy in "NAEKYUNG(內經)" and on influenced in the coming generations. Two principles for mibyung is to grow good energy and to avoid etiological cause. 2. So far oriental medicine has responded to already diseases, while to recognize the importance of mibyung is to convert it into preventive medicine which study and improve health. In spite of the opinion that no disease is health and no health is disease, the contrite of medical approch by the relative importance is necessary by understanding the steps of mibyung between health and disease with subdividing the steps of the occurance therefore, the scope of oriental medicine may be recognized from every disease to mibyung, that is, health. 3. Diagnosing and treating in the step of mibyung has more important meaning than suffering step because the checkup of mibyung means early examination and treatment. Mibyung can make an opportunity that improve scientific contradiction and defect of oriental medicine. However, scince the theory and practice lack the arrangement and study, much exertion and discussion is necessary.4. The diagnosis and cure in mibyung doesn't have many methods for treating, its index and standard isn't nified, and related theory is of small quantity. But the most prominent means of solution. with combination with other sciences and through the convertion into modem clinical examination, is to accomplish moderization, objectivity and indexation, etc. 5. The representive mibyungs are a hereditary disease, immune lack, mutation, early tumor, incubation of hepatitis and each infectious diseases, stress, etc. Since every science is the product of the times, it has the historical limits. As the times develop, the desire for good health is growing. Therefore we should consider above request in this times.