gbae Jeon

Developing a Combination Model of Agricultural Machine for Optimization GHG's based on LCA

The air pollutant emission by the enlargement of farm size and the active utilization of large farm machinery is inevitable. Previous studies have investigated the quantitative evaluation for the air pollutant emission based on the life cycle assessment of public transport and heavy vehicles. However, it does not exceed the limit of the qualitative assessment for agricultural machinery. The usage of farm machinery for crop production is universal phenomenon, therefore, it is necessary to investigate the quantitative assessment for greenhouse gas and air pollutant emission due to farm machinery use in terms of life cycle assessment. In addition, it is required to represent the optimal combination of farm machinery with minimal air pollutant emission on the assumption that every combination of farm machinery over time is decided by farmers. Therefore, this study aimed at 1) assess the amount of greenhouse gas and air pollutant emission due to farm machinery use throughout the year, 2) derive the optimal combination of farm machinery for minimal emission of air pollutant during the crop production process. The scope and method of this study included the survey of air pollutant emission when every combination of farm machinery is used for 1ha-paddy farming work.

The Rearch of Stress Route for Concrete Structure using Advanced Progressive Optimization

This research describe improved algorithm that is able to decide terminal criterion of Evolutionary Structural Optimization (ESO), reducing load of calculation to search load path of concrete beam, and apply to agricultural facilities. The ESO method is that make to discrete structure, structural analyze each element stress through FEM. And repeat generation with next material condition to become for most suitable composing. Individual element introduces concept of zero stiffness, but zero stiffness decisions are gone to direction of exclusion. In this stduy, improve algorithm to be convergence by `Rule of Alive or Die` in arrival because is most suitable. Also, existing terminal criterion lack consistency because that used depend on experience of researcher. This research procedure is fellowed. First, all modulus of elasticity assume a half of elasticity modulus of material, Second, structural analysis by FEM, Third, apply to the remove ratio and restoration ratio for the `rule of alive or die`. Forth, reconstruct the element and material conditions. And repeat the first to forth process. The terminal time of evolutional procedure is the all elastic modulus of element changed to blank value or elasticity modulus value of original. Therefore, in this study, consist the algorithm for programming, and apply to the agricultural facilities with concrete.

Measurement of Structural Properties of PLA Filament as a Supplier of 3D Printer

Most of agricultural structures are consisted of complex components and exposed to various boundary conditions. There have been no ways to express those structures exactly for model experiment. As an alternative, 3D printer can produce any type of solid model. However, there are limited informations related to structural experiments using 3D printer. The object of this study gives the basic informations to structural engineers who try to use 3D printer for model experiment. When PLA was used as a supplier for 3D printer, the outcomes showed less heat deformation to compare with ABS. To test the material properties, two kinds of experiments (three-point flexibility test and compression test) were executed using universal testing machine. In three-point flexibility test, plastic hinge and its deformation were developed as observed in material such as steel. The behavior was in a linear elastic state, and elastic bending modulus and yield force were evaluated. In the compression test using unbraced columns with hinge-hinge boundary condition, the constant yield forces were observed regardless of different lengths in all columns with same section size, whereas the compressive elastic modulus was increased as the length of column was increased. The suggested results can be used for model experiments of various agricultural structures consisted of single material.

Probability Analysis of Plane Strain Element using Boundary Element Method

The objective of this study is intended to analyze stresses using the boundary element method and probability analysis for agricultural structure. Loads and material properties are an important factor when analyzing the structure. Until now, designing structure, loads and material properties are applied deterministic value. However, load and material properties involve uncertainties due to those changes probabilistic and deterministic methods could not consider uncertainties. To solve these problems, the reliability analysis based on probability properties scheme was developed. Reliability analysis is easy to approach to analysis frame structure, however it has limitation when solving plane stress strain problems a kind of agricultural structures. The BEM (Boundary Element Method) is able to analysis plane strain problems by boundary conditions. Thus, this study applied boundary element method to analysis plane strain problem, load and material properties as a probabilistic value to calculate the analytical model using Monte Carlo simulations were developed.

An Production and Consumption Analysis of CO2 in Rural Area using Remote Sensing (in Korea)

Climate change is one of the most important issues over the past few decades. Government of the Republic of Korea was published in the report of the fourth general council of climate change in 2007. Since publication of climate change was recognized as a problem caused by human activity. To preserve the earth and future scenarios of greenhouse gas emissions by all countries in building endeavor. Responding to climate change is the reduction, science and adaption. In recent years, there are many efforts in the reduction. Also, many budgets have been invested in reducing part. By investing on the treadable emission permits, greenhouse gas underground storage and alternative energy development, there are a lot of achievements. However, the reduction is expected to be concentrated on to respond to future climate change adaptation and sciences.

Developing a Optimum Allocation system for Country of Renewable Energy Plant in Korea

To use renewable energy has been emphasized because being exhausted fossil fuel and fluctuation and increase petroleum price. The rural area needs to be collectivization and concentration of renewable energy plant for use renewable energy effectively due to the area of the rural village is small. So we needs to optimize the location of renewable energy plant. Growing economies of scale and becomes easier to manage because of change in the being regions. Thus, for economical and efficient use of energy is to optimize the location of the plant. The purpose of this study developing a system that decide most suitable location of the energy plant whether investigate the energy production latency amount and amount used of the village based on country unit.

Characteristics of Carbonation of Concrete using Infrared Image

The reinforced concrete structure has long life cycle but deteriorating for life time. The mainly reason of this phenomenon is accumulation of carbon dioxide. This study describes characteristics of carbonation among factors which shorten decline concrete of durability time. Generally, carbonation does not matter the concrete itself, but it makes of passivity films of reinforcing bar. The calcium carbonate is produced through carbonation of concrete. And this is bigger than calcium hydroxide volume, and molecular weight. So, the microstructure of concrete is hard and dense. The transition of void can be changed the temperature of concrete surface. Many experimental and theoretical studies of carbonation was conducted. This study introduce the infrared thermal technique to identify characteristics of carbonation and measure strength and deteriorating level by carbonation in concrete structures of agricultural improvement project using Infrared thermal technique and estimated the remaining life time.