• Title, Summary, Keyword: IAS

Search Result 82, Processing Time 0.031 seconds

Estimation of Rainfall-runoff Erosivity Using Modified Institute of Agricultural Sciences Index (수정 IAS 지수를 이용한 강우침식인자 추정)

  • Lee, Joon-Hak;Oh, Kyoung-Doo;Heo, Jun-Haeng
    • Journal of Korea Water Resources Association
    • /
    • v.44 no.8
    • /
    • pp.619-628
    • /
    • 2011
  • The purpose of this study is to evaluate the existing method of calculating rainfall-runoff erosivity using monthly precipitation, such as Fournier's index, modified Fournier's index, IAS (Institute of Agricultural Sciences) index, etc., and to present more reasonable regression model based on monthly rainfall data in Korea. This study introduced a new simplified method of calculating rainfall-runoff erosivity based on monthly precipitation, called by modified IAS index. It was expanded form IAS index which is the simple calculation method by summing up the rainfall amount of two months with maximum amount. Monthly precipitation and annual rainfall-runoff erosivity at 21 weather stations for over 25 years were used to analyze correlation relationship and regression model. The result shows that modified IAS index is the more reasonable parameter for estimating rainfall-runoff erosivity of the middle-western and south-western regions in Korea.

The Effect of Automatic Environmental Control by Image Analysis System on the Performance of Pigs in Different Seasons

  • Chang, D.I.;Park, C.S.;Lee, H.S.;Lee, B.D.;Chang, H.H.
    • Asian-Australasian Journal of Animal Sciences
    • /
    • v.13 no.5
    • /
    • pp.681-685
    • /
    • 2000
  • A computer software was developed in our laboratory to automatically control the pigs environment by the image analysis system (IAS), which monitors and analyzes the pig's behavior and feeds the results back to the computer hardware. Three feeding trials were conducted with growing pigs ($L{\times}Y$) to test the effectiveness of the IAS under various seasons. In all three trials, the open-sided conventional pens with half-slatted floor were used as controls; for the IAS treatment, fully-slatted floors were used in the windowless pens. Experiment 1 was conducted in the winter for 30 d with 24 growing pigs. There were two treatments (Conventional vs. IAS), and three pens (replicates) per treatment. During the growing period, the feed efficiency was significantly (p<0.05) improved by the IAS. In addition, the pigs reared under the IAS during the growing period displayed better growth rate during the finishing period than did the pigs reared under the conventional conditions. Experiment 2 was conducted in the summer for 30 d with 24 growing pigs. The experimental design was the same as Experiment 1. During the finishing period, all the pigs were kept in conventional open-sided pens until their market weights to evaluate their carcass characteristics. During the growing period, the growth rate and feed efficiency of the pigs in the IAS was better than those of the control pigs. In addition, various carcass characteristics were significantly improved by the IAS rearing during the growing period. Experiment 3 was conducted with 30 growing pigs for 30 d in the spring. The experimental design was the same as Experiment 1. No difference was found in growing performance between the control and IAS pigs. It could be concluded that the IAS is effective in providing optimum conditions for the growing pigs in summer and winter seasons. In addition, providing an optimum environment during the growing period results in improved growth rate, feed efficiency, and carcass qualities for the finishing pigs.

An Approximation of the Rainfall Factor (R) in Predicting Soil Loss (토양유실량여측을 위한 강우인자(降雨因子)의 추정(推定))

  • Shin, Jae-Sung;Koh, Mun-Hwan;Im, Jeong-Nam
    • Korean Journal of Soil Science and Fertilizer
    • /
    • v.16 no.2
    • /
    • pp.106-111
    • /
    • 1983
  • As calculation of R factor value in the Universal Soil-Loss Equation is tedious, a new simple method (IAS Index) to approximate the R factor value is proposed. Although the several methods have been tested to get R value, no one fits our conditions. IAS Index is simply calculated by summing up the amount of rainfall over two months with maximum $EI_{30}$ values. The Index is highly correlated to $EI_{30}$ value in western part of peninsular. The difference is less than 10% between $EI_{30}$ value and IAS Index. Therefore, R factor can be estimated from IAS index, summing up the rainfall amount of June and August in this region. However, IAS Index works poorly in other region, especially, eastern coastal side. The large difference may be partly due to side distribution of $EI_{30}$ value, which means no special $EI_{30}$ peaks during heavy rainy months. In this case, IAS Index is not applicable directly.

  • PDF

A Study on Heavy Metal Removal Characteristics Using Bone Char (골탄(bone char)의 중금속 제거 특성에 관한 연구)

  • Kim, Jae-Young;Kim, Hwan-Gi
    • Journal of Korean Society of Water and Wastewater
    • /
    • v.21 no.2
    • /
    • pp.253-258
    • /
    • 2007
  • The adsorption capacity of bone char for lead, cadmium and zinc was studied in both single and binary multiple component systems. Equilibrium experimental studies have been performed to determine the sorption capacity of bone char for each metal ion. These have been analysed using single and multi-component equilibrum models. The results show that the sorption of metal ions for multi-component systems can be predicted reasonably well from the IAS theory with the Langmuir equation, the Freundlich and the Slip equation for metal ions.

Dextrous sensor hand for the intelligent assisting system - IAS

  • Hashimoto, Hideki;Buss, Martin
    • 제어로봇시스템학회:학술대회논문집
    • /
    • /
    • pp.124-129
    • /
    • 1992
  • The goal of the proposed Intelligent Assisting System - IAS is to assist human operators in an intelligent way, while leaving decision and goal planning instances for the human. To realize the IAS the very important issue of manipulation skill identification and analysis has to be solved, which then is stored in a Skill Data Base. Using this data base the IAS is able to perform complex manipulations on the motion control level and to assist the human operator flexibly. We propose a model for manipulation skill based on the dynamics of the grip transformation matrix, which describes the dynamic transformation between object space and finger joint space. Interaction with a virtual world simulator allows the calculation and feedback of appropriate forces through controlled actuators of the sensor glove with 10 degrees-of-freedom. To solve the sensor glove calibration problem, we learn the nonlinear calibration mapping by an artificial neural network(ANN). In this paper we also describe the experimental system setup of the skill acquisition and transfer system as a first approach to the IAS. Some simple manipulation examples and simulation results show the feasibility of the proposed manipulation skill model.

  • PDF

A Comparison of the IAS and Langmuir Models for Multisolute Adsorption of Organic Cowlpounds in Soil (유기화합물들이 혼합상태에서 토양입자에 흡착하는 정도를 IAS와 Langmuir Model을 이용한 예측비교연구)

  • 윤춘경
    • Geotechnical Engineering
    • /
    • v.11 no.2
    • /
    • pp.121-138
    • /
    • 1995
  • The Langmuir competitive model and the IAS(ideal adsorption solution) model were eveluated and compared in a multisolute adsorption study using five organic compounds (phenol, 2, 4-dichlorophenol, 2, 4, 6-trichlorophenot brucine, and thiourea) and two soils. The chemicals were evaluated individually and in mixtures. In general, the IfS model predicted the equilibrium concentration of a chemical in a mixture better than the Langmuir model. The Langmuir model underestimated the sorption of phenol when the concentration of another compound in a mixture with phenol was high. Neither of the models predicted satisfactorily the equilibrium concentration of thiourea in the mixtures. Thiourea is an aliphatic compound while the other four chemicals are aromatic compounds.

  • PDF

Application of Immune Algorithm for Harmonic State Estimation (전력시스템 고조파 상태 추정에서 면역 알고리즘 적용)

  • Wang Yong-Peel;Park In-Pyo;Chung Hyeng-Hwan
    • The Transactions of the Korean Institute of Electrical Engineers A
    • /
    • v.53 no.12
    • /
    • pp.645-654
    • /
    • 2004
  • The design of a measurement system to perform Harmonic State Estimation(HSE) is a very complex problem. In particular, the number of available harmonic analysis measurement instruments is always limited. Therefore, a systematic procedure is needed to design the optimal placement of measurement points. This paper presents an optimal algorithm of HSE which is based on an optimal placement of measurement points using Immune Algorithm (IAs). This IA-HSE has been applied to power system for the validation of an optimal algorithm of HSE. The study results have indicated an economical and effective method for optimal placement of measurement points using Immune Algorithm (IAs) in the HSE.

Revenue Management Model for Internet Access Service (인터넷 접속서비스 사업의 수익관리모형에 관한 연구)

  • 윤문길;이필환
    • Korean Management Science Review
    • /
    • v.19 no.1
    • /
    • pp.143-162
    • /
    • 2002
  • The concept of revenue management have been used widely In the hotel and all transportation industries, and considered as a good system for managing a perishable asset. Recently, its' application area is being increasingly expanded to service industries such as the travel, the railway, the Internet and the sport industries. Internet business can be classified into several groups according to the characteristics of the individual business. One of groups is Internet Access Servoce business which connects each users to the internet. In this paper, since internet Access Services (IAS) business has a similar property to the service Industry, we will apply a revenue management concept to It. With some modification of existing model developed by Subramanian et.al. for airlines, we suggest the revenue management model being applied to IAS business. Computational experiment shows that the Increase of the revenue Is up to 7% by appluing our model. It means our model has a potential to manage IAS business effectively.

Natural Language Query Framework on the Semantic Web

  • Kim, Jin-Sung
    • Proceedings of the Korean Institute of Intelligent Systems Conference
    • /
    • /
    • pp.189-192
    • /
    • 2007
  • This study proposes a Natural Language Query Framework (NLQF) on the semantic web to support the intelligent deduction at semantic level. A large number of former researches are focused on the knowledge representation on the semantic web. However, to revitalize the intelligent agent (IA)-based automated e-business contract with human customers, there is a need for semantic level approach to the web information. To enable accessing web information at semantic level, this paper discusses the pattern of complex natural language processing at first, and then the semantic web-based natural language inference in e-business environment. The NL-based approach could help the IAs on the web to communicate with customers and other IAs with more natural interface than traditional HTML-based web information. Therefore, our proposed NLQF will be used in semantic web-based intelligent e-business contracts between customers and IAs.

  • PDF

Development of Volume Modified Sorption Model and Prediction for Volumetric Strain of Coal Matrix (흡착에 의한 석탄암체의 부피변화가 고려된 흡착모델 개선 및 부피변형률 예측)

  • Kim, Sang-Jin;Sung, Won-Mo
    • Journal of the Korean Institute of Gas
    • /
    • v.19 no.2
    • /
    • pp.37-44
    • /
    • 2015
  • We proposed the improved Langmuir adsorption relations considering volume change effect of coal matrix during primary production of CBM and Enhanced-CBM with injection of carbon dioxide or CCS in coalseam but also volumetric strain. To verify this model, experimental data of pure gas adsorption such as $CO_2$, $CH_4$, and $N_2$ on coals were used to compare conventional Langmuir model with this model. From the results, we obtained that the larger adsorption capacity of coal and the higher adsorption affinity of gas, the larger error occur with Langmuir model. Using this model, however, we found not only substantially better fit in all condition but also reasonable volumetric strain of the coal matrix. We also applied this volume modified pure gas adsorption model to the IAS model to describe gas adsorption and volumetric strain for mixed gas. This modified-IAS model fitting experimental data by Hall et al(1994) improved accuracy of mixed gas adsorption calculation compared with conventional model.