• 수산경영론집
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• 제53권1호
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• pp.55-72
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• 2022

The domestic catch of squid is decreasing every year. Import volume is increasing to replace these domestic products. Import volume is expected to increase in the future, so it is necessary to study import substitution. Therefore, in this study, after selecting frozen squid, which accounts for the majority of imported squid, as the target fish species, China, Chile and Peru, which account for the majority of frozen squid imports, will be selected as the target countries for analysis. Then, the demand function of squid is estimated using the Rotterdam model, the inverse Rotterdam model, AIDS and inverse AIDS, which are the simultaneous equation demand types, and then elasticity is derived. After that, these models are compared in terms of significance, theoretical fit and practical fit.

• 한국인구학
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• 제27권1호
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• pp.81-90
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• 2004

도시가구의 인구학적 특성을 감안하여 흡연가구의 미시자료를 활용한 이차형식 준이상 수요 체계를 추정해본 결과 담배수요의 가격탄력성은 -0.52 로 추정되었고 가구소득이 높을수록, 가구주 교육수준이 높을수록, 자녀수가 많을수록 담배수요는 가격에 대하여 비탄력적임이 확인되었다.

• 수산경영론집
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• 제54권2호
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• pp.31-44
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• 2023

This study examines the demand system of shrimp imported from top four countries and domestically produced by using AIDS (Almost Ideal Demand System) model. Top four import countries are Vietnam, Ecuador, China, and Malaysia based on the value of imports in 2021. As results of the analysis, the demand system of shrimp turn out to be below. First, the relationship of domestic shrimp and imported shrimp (Ecuadorian and Vietnamese) is identified as complements or substitutes depending on whether the income effect is considered. This result implies that imported shrimp supplements domestic supply against excess demand while homogeneous shrimp products competes with domestic shrimp in fish market. Second, the relationship among imported shrimps turned out to be both substitutes and complements. Especially, the Vietnamese shrimp is complementary with Chinese and Malaysian shrimp, but substitutes of Ecuadorian. It is assumed that adjoining Asian countries shares similar shrimp species and processing system which differentiates from Ecuadorian. Finally, the study included quarter as dummy variable and GDP as instrumental variable of expenditure in the model. The result confirmed that domestic shrimp is highly on demand during the main production season while imported shrimp is mainly demanded during the rest of the season.

• 가정과삶의질연구
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• 제20권1호
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• pp.45-56
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• 2002

The main purposes of this article are to introduce the theoretical backgrounds and empirical application methods of two different Models for the function of expenditure, and to compare the goodness-o(-fit of the two models: a single-equation model and a complete-system-of-demand-equation model. For the empirical analysis of the single-equation model, a linear formula and a double-leg formula were employed. In order to test the complete-system-of-demand-equation model empirically, the \"Linear Approximation/Almost Ideal Demand System (LA/AIDS)" was used. The independent variables were the total living expense and expenditure categories Price index. The data used in this study were obtained from the quarterly statistics of "The Annual Report on the Urban Family Income and Expenditure Survey (Dosigagyeyonbo)" and "The Annual Report on the Consumer Price Index (Sobijamulgajaryo)," for the years 1994 to 1997. The goodness-of-fit (R-square) was higher with the complete-system-of-demand-equation model than with the single-equation model for the budget share on food (excluding eating-out expenses) and for the share on cultural and recreational activities. However, there was no difference between the two models in terms of the proportion of the expenditure on automobile fuel.fuel.

• 수산경영론집
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• 제40권3호
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• pp.29-49
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• 2009

There are various types of predictable economic benefits to restoring beneficial uses from contaminated marine sediment cleanup. These benefits can be derived from reduction in aquatic animals died or infected, increase in their consumption recovery, increase in tourism including recreational fishing, reduction in human health risk, increase in amenity and aesthetics, increase in ecosystem integrity, and so on. The paper focuses on estimating the net increase in value for producers and consumers from producing and consuming those fish due to the pollution reduction of marine contaminated cleanup project. Almost Ideal Demand System(AIDS) is employed for estimate of the demand for fish, and the production cost function for fish are determined using market data. The result shows 10.8 billion won per year for economic surplus to the net increase for producers and consumers.

• 대한교통학회지
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• 제23권8호
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• pp.67-75
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• 2005

본 연구에서는 미국의 소비자 지출(1984-2002) 자료를 이용하여 교통과 통신간의 상호연관성을 분석하였다. 먼저 소비자 지출 전체 항목 중 교통 및 통신 관련 항목을 12가지로 분류하였으며, 데이터의 수가 적어 이 세부항목을 다시 5개의 대 항목(대중교통, 차량구입, 차량운영, 전자통신매체 인쇄통신매체)으로 그룹화한 후 Linear Approximate Almost Ideal Demand System(LA/AIDS) 기법을 이용하여 소비자 수요 모형을 개발하였다. 또한 평균 소비자 지출 분담율을 기준으로 교통과 통신의 소득 및 가격 탄력성을 산출하였다. 모형추정결과, 교통과 통신의 상호관계는 항목별로 대체(예, 대중교통 이용과 전자통신미디어 이용) 및 보완(예, 개인차량 구입과 전자통신미디어 이용)관계가 있는 것으로 규명되었다. 그리고 교통관련 항목의 소비자 지출이 통신관련 항목의 지출보다 소득면에서 보다 탄력적인 것으로 나타났다.

• 한국유기농업학회지
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• 제25권1호
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• pp.37-52
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• 2017

Three varieties of green pepper - Chungyang pepper, Cucumber-taste pepper and Nokgwang pepper - are competing with one another in consumption due to the overlapping shipment period. The objective of this study is to analyze the influence of monthly variations of shipment quantities on the wholesale market prices. A Linear Approximated Inverse Almost Ideal Demand System (LA/IAIDS) is employed with monthly data set of three different varieties of green pepper consumption. The results show that if there is an excess supply in the market, the rate of the price decline is larger for forcing culture Chungyang pepper than other pepper varieties. On the contrary, change in supply of cucumber-taste pepper and Nokgwang pepper has little effect on the price of Chungyang pepper. The results of this study can be utilized as a basic information for enhancing the farm income and promoting agricultural policies related to the establishment of self-help funds by Chungyang pepper producer groups in Gyeongnam region.

• 대한교통학회지
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• 제20권3호
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• pp.93-103
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• 2002

우리 국민의 교통수요행태를 분석하기 위하여 준이상수요체계(almost ideal demand system) 함수형태의 집계교통수요모형을 설정하였다. 대중교통수단으로서 시내버스, 시외버스, 택시, 기차, 전철이 그리고 개인교통수단으로서 연료비가 포함되었으며, 기타재화 및 서비스에 대한 소비지출이 함께 추정되었다. 추정에 이용된 자료는 통계청의 "도시가계연보"에 수록된 '전국 도시가구 소비지출'과 "물가통계"에 수록된 '전국 도시소비자 물가'이다. 추정결과 모형의 설명력을 나타내는 수정결정계수(adjusted-$R^2$)는 대부분 0.9 내외에서 높게 나타났다. 추정계수는 총 51개중에서 25개가 5% 수준에서 유의한 것으로 나타났다. 추정된 계수값을 이용하여 가격탄력성과 소득탄력성을 구하였다. 자기가격탄력성과 소득탄력성 추정치는 조금 높기는 하나 부호와 상대적 크기가 모두 예상과 일치하고 다른 연구결과들과 유사한 범위에 있다. 연료비에 대한 소득탄력성은 1.72로 가장 높게 나타났고, 대중교통수단은 0.03~0.49 사이에서 나타나므로 교통수단이 정상재임을 의미한다. 보상수요의 교차가격탄력성은 총 15개의 교차관계에서 12개의 관계가 상식과 일치한다. 다음 연구에서는 더 많은 시계열자료를 발굴하여, 장기간의 교통수요 변화에 대한 분석을 시도할 필요가 있다. 또한 초월대수함수나 동태함수 등 다양한 형태의 수요함수를 시도할 필요가 있다. 여러가지 형태의 교통수요함수추정을 통해서 우리 현실에 적합한 교통수요모형을 발견할 수 있을 것이다. 대도시와 중소도시 등 지역별 지출자료를 발굴하여 지역특성을 반영하는 교통수요함수의 추정도 필요하다.

• 한국의류학회지
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• 제36권12호
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• pp.1285-1296
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• 2012

This study investigates the effects of changes in price, total consumption expenditures and economic sitations on Korean household demands for clothing and footwear using time-series data. The clothing and footwear category was reclassified as clothing, footwear and clothing services items for the demand analysis. This study utilized the Linearized Almost Ideal Demand System (LAIDS) model to analyze household demand. The results indicate that price and total consumption expenditures are significantly related to Korean household consumption expenditure allocations for clothing and footwear items. The effects of the IMF bailout crisis in 1997 and the global financial crisis in 2008 on household expenditure shares for clothing and footwear items were very weak and statistically insignificant. All the demand elasticities were estimated with respect to total consumption expenditures and prices. Clothing was expenditure elastic (greater than one) and other items were classified as inelastic. All the own price elasticities of demands were negative (other than clothing). Through the estimations of cross price elasticity the relationships between the demands for items and other item prices were evaluated (i.e., substitutes and complements).

• 산업경영시스템학회지
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• 제43권2호
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• pp.1-13
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• 2020

There are several methods of peak-shaving, which reduces grid power demand, electricity bought from electricity utility, through lowering "demand spike" during On-Peak period. An optimization method using linear programming is proposed, which can be used to perform peak-shaving of grid power demand for grid-connected PV+ system. Proposed peak shaving method is based on the forecast data for electricity load and photovoltaic power generation. Results from proposed method are compared with those from On-Off and Real Time methods which do not need forecast data. The results also compared to those from ideal case, an optimization method which use measured data for forecast data, that is, error-free forecast data. To see the effects of forecast error 36 error scenarios are developed, which consider error types of forecast, nMAE (normalizes Mean Absolute Error) for photovoltaic power forecast and MAPE (Mean Absolute Percentage Error) for load demand forecast. And the effects of forecast error are investigated including critical error scenarios which provide worse results compared to those of other scenarios. It is shown that proposed peak shaving method are much better than On-Off and Real Time methods under almost all the scenario of forecast error. And it is also shown that the results from our method are not so bad compared to the ideal case using error-free forecast.