Seong-Soo Yoon

Far-infrared drying characteristics and quality assessment of Ligularia fischeri

The purpose of this study was to investigate drying models and drying characteristics of Ligularia fischeri by using far-infrared drying. The far-infrared drying tests on L. fischeri were performed at air velocities of 0.6 and 0.8 m/s, and drying chamber temperatures of 40, 45, and 50°C. Four thin layer drying models were used to estimate drying curves. Drying characteristics were analyzed on the basis of drying rate, color, antioxidant activity, and contents of polyphenolics and flavonoids. The goodness of the models was estimated using the coefficient of determination, the root mean square error, and the reduced chi-square. The results revealed that increases in drying temperature and air velocity caused a decrease in drying time. The Page and Thompson models were considered suitable for the far-infrared drying of L. fischeri. After drying, the antioxidant properties of L. fischeri were decreased under all drying conditions.

A Study on Rural Theme Park Considering the Local Characteristics

The definition of a rural theme park was presented and it`s development directions were set up as grasping the problems of existing rural theme park. The creation method of a rural theme park was presented through the case study of a design planning. A rural theme park should be designed with consideration to regional characteristics based on the rural amenity. The characteristics of rural theme parks set by theme, unity, integrity, originality, and eco-friendly. And the visit reasons of rural theme park are rural experience, lodging, relaxation or recreation, comfort or easy, and food purchase. A case study area is around Geopo-Ri and Gueum-Ri Okcheon-Gun Chungcheongbuk-Do. The master plan of this area was prepared.

SIMULATING NETWORK STRUCTURES USING BERNOULLI'S PRINCIPLE

Using the fact that connections between vertices of a network often represent directed and weighted flows, we apply hydraulic principles to develop novel insights into network structure and growth. We develop a network model based on Bernoullis principle and use it to analyze changes in network properties. Simulation results show that velocity of flow, resistance, fitness and existing connections in a system determine network connections of a vertex as well as overall network structure. We demonstrate how network structure is affected by changes in velocity and resistance, and how one vertex can monopolize connections within a network. Using Bernoullis principle, we are able to independently reproduce key results in the network literature.

Development of Evaluation Indices for Redundant Farmlands Rehabilitation-Policy Directions

The objective of this study is to develop evaluation indices which can be applied to analyze rational rehabilitation-policy directions of redundant farmlands. To achieve this objective, the main tasks of this research are 1) categorizing the redundant farmlands rehabilitation types 2) developing the evaluation indices of redundant farmlands rehabilitation 3) determining the weights of each index. The redundant farmlands rehabilitation types were classified into agricultural rehabilitation type, non-agricultural rehabilitation type and hybrid type which are called by agricultural income model, rural environment improvement model and hybrid model as development project name, respectively. The 5 parts and 21 indices for evaluation of redundant farmlands rehabilitation directions were extracted by case studies and experts brainstorming. The weights of each index were determined by Analytic Hierarchy Process (AHP). The developed evaluation indices were applied to study areas located on Yanghwa district of Gongju-city and Aewol district of Jeju-city. From the results of this study, it was ascertained that the evaluation indices developed in this study would help the decision-makers in the planning process of redundant farmlands rehabilitation directions.

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.

Characteristics of Visitor Rural Experience Village using Questionnaire Analyzed - case study for Cheongwongun Cooperative Tourism Model Project -

The objectives of this study are investigate the satisfaction index and determined the characteristics of visitors. Also present the issues and direction for development of rural-experience village. This study area is seven villages of rural experience in Cheongwongun, Chungcheongbukdo. This place consists rural cooperative tourism model project that is pursued to Cooperative Tourism Model Project by the government. The projects are forming a network of towns and themes to be exhumed. The purpose of this project inner improves the ability of residents and external to contents diversification. This polling in the February-March 2008 was conducted between visitor 330 people. The question is personal information, satisfaction and rural tourism experience of detail as part of a total of 22.

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.

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.

Reinforcing Effect of Thin-wall at Serviceability Condition

For the reasonable analysis of design problems for agricultural facilities, considered the reinforcing effect of thin-wall. The most of agricultural structure is constructed small scale and have many purposes. Thus it has been designed temporary rather than permanent structure, and has relatively large slenderness ratio, small section and semi-rigid condition. Therefore many agricultural facilities are consist of relatively strong frame with weak wall at the viewpoint of stiffness and have not been reflected in the design. But the tension field influences to collapse of structure have already known. Therefore, we need quantification the effect of tension field at structural analysis. In this study, present the method of quantification the effect of tension field that came out thin-plate surrounded by high stiffness frame. The numerical results show that the effect of tension field effect for thin-wall is about 5% of the sectional area of frame in study agricultural facilities.