• Title/Summary/Keyword: Total estimation

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An Estimation of Social Welfare Resources in Korea (우리나라 사회복지 자원총량 추계에 관한 연구)

  • Kim, Kyo-Seong;Kim, Jong-Gun;An, Hyun-Mi;Kim, Seong-Wook
    • Korean Journal of Social Welfare
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    • v.59 no.4
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    • pp.319-346
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    • 2007
  • The main purpose of this research is to figure out systematically the total amount of social welfare resources in Korea. For the stated purpose, this research (1) defines the concept of social welfare resource, (2) develops basic framework for measuring total amount of resources, (3) estimates total amount of social welfare resources based on the year of 2004, and (4) presents some implications of findings. Social welfare resource is defined as any valuable things, material or immaterial, that one can put into instrumental use in order to meet social needs or to resolve problems in the interaction process between human and the environment. Institutional sectors of social welfare resource consist the following 5 major areas derived from resource providers: The government, enterprise, market, the third sector (religion & welfare institutions, fundraising agencies, and NPOs), and community (families, relatives, and neighborhoods). For the estimation of the total amount of social welfare resources, this research takes advantages of both the major methods of provider centered approach and the intermediary agent centered approach. Based on the compromised method estimation, the total amount of social welfare resources in Korea in the year of 2004 is 147 trillion won (approximately, 148 billion dollars and 19% of GDP). Among them, central and local governments provide 52 trillion won. The private sector expends a total of 109 trillion won, which contains 44 trillion from enterprise, 54.3 trillion from market, 3.0 trillion from the third sector, and 8.3 trillion from the community. The enterprise and market share of welfare resources exceeds 66% of the total expenditure, and the market is expected to increase gradually in the near future.

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A Software Maintenance Cost Estimation Model based on Real Maintenance Efforts (투입노력 양에 기반한 소프트웨어 유지보수 비용산정 모형)

  • Jeong, Eun-Joo;Yoo, Cheon-Soo
    • Journal of Information Technology Applications and Management
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    • v.19 no.2
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    • pp.181-196
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    • 2012
  • The cost of software maintenance occupies about two thirds in the software lifecycle. However, it is not easy to estimate the cost of software maintenance because of various viewpoints about software maintenance, unclear estimation methods, and complex procedures. Until now, the cost estimation model has used compensation factors for software characteristic and environment on the basis of program size. Especially, most of existing models use maintenance rate of total software cost as a main variable. This paper suggests the software maintenance cost estimation model that uses the result of calculating real maintenance efforts. In this paper, we classify functional maintenance and non-functional maintenance as software maintenance activity type. For functional maintenance, present function point of target software is needed to evaluate. The suggested maintenance cost evaluation model is applied to a software case in public sector. This paper discusses some differences between our model and other modes.

Small Area Estimation of Unemplyoment Using Kalman Filter Method (KALMAN FILTER기법을 이용한 실업자 수의 소지역 추정)

  • 양영춘;이상은;신민웅
    • The Korean Journal of Applied Statistics
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    • v.16 no.2
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    • pp.239-246
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    • 2003
  • In small area estimation, Best Linear Unbaised Predictor(BLUP) can be directly implicated ,specially, in use of the time series estimation. If there are correlations between observations and error terms over the time, Kalman Filter method can be used. Therefore, using kalman Filtering technique small area estimation of total of unemployments are estimated by BLUP. And for the example of this study, Economic Active Population Survey data were used.

Estimation of Discharge Load due to Combined Sewer Overflows in the Management of Total Maximum Daily Loads (수질오염총량관리 관거월류부하 변화에 따른 배출부하량 산정방법)

  • Park, Jun Dae;Oh, Seung Young;Choi, Ok Youn
    • Journal of Korean Society on Water Environment
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    • v.27 no.3
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    • pp.293-299
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    • 2011
  • The quantity of a discharge load can change with changes in rainfall in the area with a combined sewer system (CSS). To evaluate the implementation appropriately in the management of total maximum daily loads (TMDLs), the effects of rainfall changes should be considered in the estimation of the discharge load. The rainfall condition for the estimation of the discharge load in a certain year should be standardized to the same rainfall condition as that of the reference year. However, the calculation process is very complicated with its potential limitations. This study investigated and developed relatively simple methods for estimating the discharge load. Load conversion method (LCM) is designed to convert the discharge load under the current rainfall condition into that of the reference rainfall conditions. Simple rainfall data method (SRDM) is to simplify the estimation process of the discharge load by the simple conversion of rainfall data. These methods were applied to calculate the discharge load and examine the estimation results. From the results of this study the application of these methods may be useful for estimating the discharge load in the TMDL process.

A Study on the Construction of Computerized Algorithm for Proper Construction Cost Estimation Method by Historical Data Analysis (실적자료 분석에 의한 적정 공사비 산정방법의 전산화 알고리즘 구축에 관한 연구)

  • Chun Jae-Youl
    • Korean Journal of Construction Engineering and Management
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    • v.4 no.4 s.16
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    • pp.192-200
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    • 2003
  • The object of this research is to develop a computerized algorithm of cost estimation method to forecast the total construction cost in the bidding stage by the historical and elemental work cost data. Traditional cost models to prepare Bill of Quantities in the korea construction industry since 1970 are not helpful to forecast the project total cost in the bidding stage because the BOQ is always constant data according to the design factors of a particular project. On the contrary, statistical models can provide cost quicker and more reliable than traditional ones if the collected cost data are sufficient enough to analyze the trends of the variables. The estimation system considers non-deterministic methods which referred to as the 'Monte Carlo simulation. The method interprets cost data to generate a probabilistic distribution for total costs from the deficient elemental experience cost distribution.

A Model for Software Effort Estimation in the Development Subcycles (소프트웨어 개발 세부단계 노력 추정 모델)

  • 박석규;박영목;박재흥
    • Journal of the Korea Computer Industry Society
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    • v.2 no.6
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    • pp.859-866
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    • 2001
  • Successful project planning relies on a good estimation of the effort required to complete a project, together with the schedule options that may be available. Despite the extensive research done developing new and better models, existing software effort estimation models are present only the total effort and effort (or manpower: people per unit time) function for the software life-cycle. Also, Putnam presents constant effort rate in each subcycles. However, the size of total efforts are variable according to the software projects under the influence of its size, complexity and operational environment. As a result, the allocated effort in subcycle also differ from project to project. This paper suggests the linear and polynomial effort estimation models in specifying, building and testing phase followed by the project total effort. These models are derived from 128 different projects. This result can be considered as a practical guideline in management of project schedule and effort allocation.

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Estimating Habitat Carrying Capacity of Shorebirds in the Intertidal Mudflat (조간대 갯벌에서의 도요·물떼새 서식지수용능력 추정)

  • Moon, Young-Min;Kim, Kwanmok;Yoo, Jeong-Chil
    • Ocean and Polar Research
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    • v.42 no.1
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    • pp.21-31
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    • 2020
  • Shorebirds migrating along the East Asian-Australasian Flyway (EAAF) have been drastically decreasing due to continuous area loss and quality degradation of intertidal mudflats in the Yellow Sea. Evaluating the current habitat quality by means of habitat carrying capacity estimation could be effective in predicting the magnitude of impacts caused by habitat loss and provide better understanding to improve management strategies. In this study, we estimated the total biomass of Macrophthalmus japonicus, a main prey item of curlews in the Korea peninsular as habitat carrying capacity of the southern intertidal mudflat of Ganghwa Island, one of the key stopover sites for curlews in the EAAF. The result of the estimation took into account spatial differences of prey biomass and the available foraging time by tide patterns. Accordingly, it was found that curlew populations account for 30.26% of the habitat carrying capacity. When we calculated the mean biomass of the area and extrapolated it to the whole area to calculate the total biomass, it was found that the curlews have consumed 10.92% of the total biomass. The results show that the habitat carrying capacity of the southern intertidal mudflat of Ganghwa Island has decreased by 7.8% compared to a study conducted twenty years ago employing the same method. This study shows that there can be considerable differences in the results of habitat carrying capacity estimation between different methods, indicating that various environmental factors that affect the estimation results of habitat carrying capacity must be considered to achieve a more precise analysis and assessment.

Computer나 Calculator를 이용한 계산에서 오류 교정을 위한 어림셈 지도에 관한 연구

  • Gang Si Jung
    • The Mathematical Education
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    • v.29 no.1
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    • pp.21-34
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    • 1990
  • This is a study on an instruction of estimation for error correction in the calculation with a computer or a calculator. The aim of this study is to survey a new aspect of calaulation teaching and the teaching strategy of estimation and finally to frame a new curriculum model of estimation instruction. This research required a year and the outcomes of the research can be listed as follows: 1. Social utilities of estimation were made clear, and a new trend of calculation teaching related to estimation instruction was shown. 2. The definition of estimation was given and actual examples of conducting an estimation among pupils in lower grades were given for them to have abundant experiences. 3. The ways of finding estimating values in fraction and decimal fraction were presented for the pupils to be able to conduct an estimation. 4. The following contents were given as a basic strategy for estimation. 1) Front-end strategy 2) Clustering strategy 3) Rounding strategy 4) Compatible numbers strategy 5) Special numbers strategy 5. In an instuction of estimation the meaning, method. and process of calculation and calculating algorithm were reviewed for the cultivation of children's creativity through promoting their basic skill, mathematical thinking and problem-solving ability. 6. The following contents were also covered as an estimation strategy for measurement 1) Calculating the sense of quantity on the size of unit. 2) Estimating the total quantity by frequent repetition of unit quantity. 3) Estimating the length and the volume by weighing. 4) Estimating unknown quantity based on the quatity already known. 5) Estimating the area by means of equivalent area transformation. 7. The ways of instructing mental computation were presented. 8. Reviews were made on the curricular and the textbook contents concerning estimation instructions both in Korea and Japan. and a new model of curriculum was devised with reference to estimation instruction data of the United States.

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Reliability Estimation by Simulation Using Total Hazard (시뮬레이션에서 Total Hazard 를 이용한 신뢰도 추정)

  • 전치혁
    • Journal of the Korean Operations Research and Management Science Society
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    • v.16 no.1
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    • pp.59-67
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    • 1991
  • The hazard estimator is proposed for estimating system failure probability of a general network where all minimal cut sets are given. Theoretical variance of the hazard estimator is derived in a bridge system. It is demonstrated that variance of the hazard estimator is much smaller than that of the raw simulation estimator particularly for small arc failure probability.

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