20세기 우리나라 전통의학의 발자취

奇昌德,申佐燮 대한의사협회 1999 대한의사협회지 Vol.42 No.12

Experimental Study on the Structural Safety of the Corn Harvester Attached to a Tractor

Chang-Seop Shin(신창섭),Tae-Yeong Yun(윤태영),Hwon Choi(최훤),TaeHan Kim(김태한) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.2

In South Korea, agricultural mechanization has been carried out in paddy field, but not in the upland field during recent decades. Among crops such as root vegetables, leafy vegetables from upland field, corn is used as forage for livestock as well as food for men. The corn harvester needs to be developed to replace men’s labor in rural area to follow the recent needs in the farm industry. The corn harvester is comprised of three parts such as cutting part, feeding part and pick-up part. The feeding part is so long for cut corns to be delivered from the cutting part to the pick-up part. Structurally, the load from the long moment arm is likely to be big. Thus, the setup to measure the stress on the duct of the feeding part was configured with the data acquisition system. The strain gages were attached on several points that seem to be loaded a lot comparatively. The stress was measured and the measured stresses were divided by the yield stress to get the safety factor. And then, we made sure the safety factors were above 1 on the all points. In conclusion, the feeding part of the corn harvester which convey the cut corn from the cutting part from the pick-up part can be regarded to be made safe structurally.

Stress Analysis of Tractor Front-End Loader against Impact Load Using Flexible Multi-Body Dynamic Simulation

Chang-Seop Shin(신창섭),Beom-Soo Kim(김범수),Hyun-Woo Han(한현우),Woo-Jin Chung(정우진),Seung-Je Cho(조승제),Young-Jun Park(박영준) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.3

This study was conducted to analyze the stresses by impact loads on front-end loaders attached to tractors using flexible multi-body dynamics. The model was designed and validated by comparing previous experimental data with the simulation data obtained in this study. Nine sets of conditions were designed using three weights (500, 300, and 100 kg) loaded inside a bucket and three heights (1700, 1350, and 1000 mm) of the bucket from ground level. A parametric study was carried out at five locations for two types of parts of a front-end loader. All the safety factors for the five locations under all conditions were calculated and were greater than 1. Thus, the designs of the front-end loaders were structurally safe. Based on this study, front-end loaders attached to tractors can be designed effectively in terms of cost and safety.

Energy Efficiency Classification of Agricultural Tractors in Korea

( Chang Seop Shin ),( Kyeong Uk Kim ),( Kwan Woo Kim ) 한국농업기계학회 2012 바이오시스템공학 Vol.37 No.4

Purpose: This study was conducted to classify the energy efficiency of 131 tractor models tested during from 2006 to 2010 in Korea. Methods: Four sub-indexes were developed using the fuel consumptions at 60% and 90% of rated speed with partial loads and at pull speeds of 3.0 km/h and 7.5 km/h with maximum drawbar pull. Weighting factors of the sub-indexes were also considered to reflect the characteristics of tractor`s actual working hours in Korea. Four sub-indexes were integrated into a classification index. Using the developed classification index, a five-classification system was made on the basis of normal distribution of tractors over the classification range. Percentage of 1st grade interval was expected to be close to 15%, 2nd grade 20%, 3rd grade 30%, 4th grade 20%, 5th grade 15%. Results: Number of 1st grade was 21, 2nd grade 23, 3rd grade 39, 4th grade 33, 5th grade 15 among 131 models. Conclusions: Classification index was developed by integrating four sub-indexes. By the classification method using developed index, distribution of classified tractors was acceptable for practical application.

Analysis of Air Pollutant Emissions from Agricultural Machinery in South Korea

Chang-Seop Shin(신창섭),Tusan Park(박두산),Dong-Hyuk Hong(홍동혁),TaeHan Kim(김태한) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.3

From 2019 onwards, more stringent regulations (from Stage 4 to Stage 5) are to be implemented in Europe in order to reduce the air pollutant emissions. In South Korea, the government authorities started to make new regulation to meet the European regulation. As a first step, the air pollutant emissions such as CO, NOx, SOx, TSP, PM10, PM2.5, VOC, NH3 by agricultural machinery were analyzed based on CAPSS inventory along with the analysis in the general aspect in this study. Three levels of analysis was conducted each in agricultural machinery aspect along with in the general aspect. Per agricultural tractor, all kinds of the air pollutant emissions decreased by 25, 25, 99, 25, 25, 25, 25% for the CO, NOx, SOx, TSP, PM10, VOC, NH₃ emissions each from the year 2000 to the year 2014. Per combine harvester, all kinds of the air pollutant emissions decreased by 63, 63, 91, 63, 63, 63, 63% for the CO, NOx, SOx, TSP, PM10, VOC, NH₃ emissions each from the year 2000 to the year 2014.

Classification Index and Grade Levels for Energy Efficiency Classification of Agricultural Heaters in Korea

Shin, Chang Seop,Jang, Ji Hoon,Kim, Young Tae,Kim, Kyeong Uk Korean Society for Agricultural Machinery 2013 바이오시스템공학 Vol.38 No.4

Purpose: This study was carried out to develop a classification index and grade levels to rate agricultural heaters for energy efficiency classification. Methods: The classification index was developed mainly by taking simplicity of calculation and easy access to relevant data into consideration. The grade levels were developed on the basis of a 5-grade classification system in which graded heaters are to be normally distributed over the grades. The value of each grade level were determined in terms of the classification index values calculated using the published performance data of agricultural heaters tested at the FACT in Korea over the past 12 years. Results: The thermal efficiency of agricultural heaters based on the enthalpy method was proposed as a reasonable classification index. The grade levels were proposed in equation form for three types of agricultural heaters: fossil fuel heaters, wood pellet heaters and wood pellet boilers. A reasonable energy efficiency classification of agricultural heaters could be performed using the proposed classification index and grade levels. Conclusions: It is expected that energy saving programs will be extended to agricultural machines in the near future. The classification index and grade levels to rate agricultural heaters for energy efficiency classification were developed and proposed for such near future to come.

Agricultural Process and Food Engineering : Original Article ; Classification Index and Grade Levels for Energy Efficiency Classification of Agricultural Dryers in Korea

( Chang Seop Shin ),( Jin Geun Park ),( Kyeong Uk Kim ) 한국농업기계학회 2014 바이오시스템공학 Vol.39 No.2

Purpose: The objective of this study was to develop a classification index and the grade levels for a five-grade energyefficiency classification of agricultural dryers in Korea. Methods: The classification index and the grade levels weredetermined by using the performance test data published by the FACT over the last eight years to reflect a state of the arttechnology for agricultural dryers in Korea. The five grades were designed to have the classified dryers distributed normallyover the grades with 15% for the 1st grade, 20% for the 2nd grade, 30% for the 3rd grade, 20% for the 4th grade and 15% forthe 5th grade. Results: The classification index was defined as the total amount of fuel and electrical energy consumed per1% of the wet basis moisture content evaporated from a unit mass of grain or agricultural crops during the drying process: 1MT of paddy rice for grain dryers and 1 kg of red pepper for agricultural crop dryers as the standard mass. Conclusions: Thegrade levels for the five-grade energy efficiency classification of grain dryers, kerosene dryers, and electric dryers wereproposed in terms of the classification index value.

Metal based Additive Manufacturing for Agricultural Engineering

( Chang-seop Shin ) 한국농업기계학회 2019 한국농업기계학회 학술발표논문집 Vol.24 No.1

Additive Manufacturing (AM) has been regarded as emerging technology for renovation of manufacturing industry in developed country such as the US and Germany. However, metal AM technology has been challenging to be commercialized in the industry because of some issues such as shrinkage, surface finish, and residual stress, There are some types of metal AM technology such as Selective Laser Melting (SLM), Electron Beam Melting (EBM) AM which use laser and electron each as energy source for melting metal and accordingly have residual stress resulted from each consolidation. However, Binder-Jet Processing (BJP) type AM technology has been considered to have no residual stress because of consolidation from sintering at once in the vacuum furnace. Thus, the new process for BJP type AM was developed for stainless steel 420 and the microstructure for specimen made by BJP type AM was studied. And then, material properties such as strain stress curve and fatigue life diagram were characterized. Though the metal AM has been used in aerospace, dental and medical area up to now, it needs to be used in agricultural engineering in the future because agricultural implements are very diverse and need to be customized according to diverse environment and needs.

Energy Efficiency Classification of Agricultural Tractors in Korea

Shin, Chang-Seop,Kim, Kyeong-Uk,Kim, Kwan-Woo Korean Society for Agricultural Machinery 2012 바이오시스템공학 Vol.37 No.4

Purpose: This study was conducted to classify the energy efficiency of 131 tractor models tested during from 2006 to 2010 in Korea. Methods: Four sub-indexes were developed using the fuel consumptions at 60% and 90% of rated speed with partial loads and at pull speeds of 3.0 km/h and 7.5 km/h with maximum drawbar pull. Weighting factors of the sub-indexes were also considered to reflect the characteristics of tractor's actual working hours in Korea. Four sub-indexes were integrated into a classification index. Using the developed classification index, a five-classification system was made on the basis of normal distribution of tractors over the classification range. Percentage of $1^{st}$ grade interval was expected to be close to 15%, $2^{nd}$ grade 20%, $3^{rd}$ grade 30%, $4^{th}$ grade 20%, $5^{th}$ grade 15%. Results: Number of $1^{st}$ grade was 21, $2^{nd}$ grade 23, $3^{rd}$ grade 39, $4^{th}$ grade 33, $5^{th}$ grade 15 among 131 models. Conclusions: Classification index was developed by integrating four sub-indexes. By the classification method using developed index, distribution of classified tractors was acceptable for practical application.

Classification Index and Grade Levels for Energy Efficiency Classification of Agricultural Dryers in Korea

Shin, Chang Seop,Park, Jin Geun,Kim, Kyeong Uk Korean Society for Agricultural Machinery 2014 바이오시스템공학 Vol.39 No.2

Purpose: The objective of this study was to develop a classification index and the grade levels for a five-grade energy efficiency classification of agricultural dryers in Korea. Methods: The classification index and the grade levels were determined by using the performance test data published by the FACT over the last eight years to reflect a state of the art technology for agricultural dryers in Korea. The five grades were designed to have the classified dryers distributed normally over the grades with 15% for the $1^{st}$ grade, 20% for the $2^{nd}$ grade, 30% for the $3^{rd}$ grade, 20% for the $4^{th}$ grade and 15% for the $5^{th}$ grade. Results: The classification index was defined as the total amount of fuel and electrical energy consumed per 1% of the wet basis moisture content evaporated from a unit mass of grain or agricultural crops during the drying process: 1 MT of paddy rice for grain dryers and 1 kg of red pepper for agricultural crop dryers as the standard mass. Conclusions: The grade levels for the five-grade energy efficiency classification of grain dryers, kerosene dryers, and electric dryers were proposed in terms of the classification index value.