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노재승(Jaeseung Noh),김병진(Byungjin Kim),장인배(Inbae Chang) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
The intravenous injection is widely used for medication injection and blood sampling. The injection training kit is developed for the virtual exercise of intravenous injection instead of live body. The kit is composed of needle and virtual arm. The virtual arm have polar coordinate rotating and translating mechanisms and sensors respectively that it can measure the depth of injection, roll and pitch angle of the injected needle and it is also possible to calculate the location of the needle in the virtual 3-dimensional space. The 3-dimensional virtual arm and blood vessels are modelled and matched with the training kit that it is possible to move the needle in the virtual 3-dimensional training space where the virtual arm and blood vessels are located. This training kit may help the training of nurse candidates without any human injury problems.
Improved Method for Determining the Height of Center of Gravity of Agricultural Tractors
Kim, YuYong,Noh, JaeSeung,Shin, SeungYeop,Kim, ByoungIn,Hong, SunJung Korean Society for Agricultural Machinery 2016 바이오시스템공학 Vol.41 No.3
Purpose: This study aimed to improve the method for determining the position of the center of gravity for agricultural tractors. Methods: The proposed method uses trigonometric functions and coordinate transformation. Data were measured according to the ISO 789-6 test procedures for the center of gravity of agricultural tractors. The height calculated using the proposed method was compared with that determined from an AutoCAD drawing. To find the center of gravity of the tractor, the algorithm for finding the intersection of the two lines was used. Results: The vertical height from the ground to the center of gravity is 682.06 mm. The vertical coordinates obtained from the calculation and the drawing were the same. Conclusions: The developed method uses trigonometric and polar coordinate transformation. The method was compared and verified with the AutoCAD drawing results. The results indicate that users can apply this developed method instead of the plotting method which is an inconvenient and time-consuming. Further, users can program Microsoft Excel to easily determine the vertical coordinate. In addition, researchers will propose this method to the ISO as a standard method for determining the center of gravity in accordance with ISO 789-6.
Improved Method for Determining the Height of Center of Gravity of Agricultural Tractors
( Yuyong Kim ),( Jaeseung Noh ),( Seungyeop Shin ),( Byoungin Kim ),( Sunjung Hong ) 한국농업기계학회 2016 바이오시스템공학 Vol.41 No.4
This study aimed to improve the method for determining the position of the center of gravity for agricultural tractors. Methods: The proposed method uses trigonometric functions and coordinate transformation. Data were measured according to the ISO 789-6 test procedures for the center of gravity of agricultural tractors. The height calculated using the proposed method was compared with that determined from an AutoCAD drawing. To find the center of gravity of the tractor, the algorithm for finding the intersection of the two lines was used. Results: The vertical height from the ground to the center of gravity is 682.06 mm. The vertical coordinates obtained from the calculation and the drawing were the same. Conclusions: The developed method uses trigonometric and polar coordinate transformation. The method was compared and verified with the AutoCAD drawing results. The results indicate that users can apply this developed method instead of the plotting method which is an inconvenient and time-consuming. Further, users can program Microsoft Excel to easily determine the vertical coordinate. In addition, researchers will propose this method to the ISO as a standard method for determining the center of gravity in accordance with ISO 789-6.
박재훈(ChaeHoon Park),노재승(JaeSeung Noh),장인배(InBae Chang) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
BLDC motor is widely used as a servo motor, because it has efficiency, high power ratio, low inertia, and low maintenance. However, BLDC motor generally needs position and speed sensors to synchronize the phase angle that it raises the system costs and complexity. This paper describes a simple sensor-less speed control of BLDC motor with using back EMF signal. Adaptive PID speed control algorithm was developed and verified for wide speed ranges.
( Seungyeoub Shin ),( Changho Kang ),( Seokcheol Yu ),( Yuyong Kim ),( Jaeseung Noh ) 한국농업기계학회 2015 바이오시스템공학 Vol.40 No.3
Purpose: This research suggests a method of establishing criteria for working area and operating cost for a long-term lease of agricultural machinery. Methods: Eight crops were selected-three food crops and five open-field vegetables-and agricultural machines used for sowing, transplanting, and cultivation in dry-field farming were analyzed. Results: The break-even acreage for agricultural machinery under a long-term lease was found to differ by agricultural machine, ranging from 1.0 to 5.8 ha. In terms of arable land area, the break-even acreages for harvesting machinery and transplanters were 15.6 to 26.1 ha and 6.1 to 8.6 ha, respectively. The working area lessees should secure was divided into two cases: (1) 2.0 to 11.6 ha when leasing individual agricultural machines (sowing and transplanting) for a long-term period, and (2) more than 10 ha when farmers who cultivate beans, potatoes, garlic, onions, and so on lease sowing and transplanting machines as a set. When agricultural machinery was leased for a long term, the operating cost and working time were reduced by 27.6 to 74.4% and 2.5 to 21.6%, respectively, indicating considerable effect. Conclusions: A long-term lease project needs to be promoted to overcome the limitation of short-term leases of agricultural machinery. The local government should lead this project and facilitate the mechanization of dry-field farming. The department in charge of agricultural machinery lease projects needs to set the working area to cover the rate and maintenance cost for farmers who lease agricultural machinery for the long term.