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Monetary Policy Shocks and Exchange Rate Changes in Korea
Heonyong Jung,Myunghoon Han 국제문화기술진흥원 2019 International Journal of Advanced Culture Technolo Vol.7 No.1
This paper examines whether the exchange rate respond differently to monetary policy shocks in Korea using regression model. We find an asymmetric response of the monetary policy shocks to the monetary policy shocks in the context of Korea. Over the whole period sample, we do not find the effect of an actual interest rate on exchange rate. But we find that the estimated coefficient on the expected and unexpected change in the policy rate are negative and statistically significant. In the period of monetary policy easing, the estimated coefficient on the expected and unexpected change in the policy rate are negative but not statistically significant. In contrast, the period of monetary policy tightening, the estimated coefficient on the expected and unexpected change in the policy rate are negative and statistically significant.
Monetary Policy Shocks and Exchange Rate Changes in Korea
Jung, Heonyong,Han, Myunghoon The International Promotion Agency of Culture Tech 2019 International Journal of Advanced Culture Technolo Vol.7 No.1
This paper examines whether the exchange rate respond differently to monetary policy shocks in Korea using regression model. We find an asymmetric response of the monetary policy shocks to the monetary policy shocks in the context of Korea. Over the whole period sample, we do not find the effect of an actual interest rate on exchange rate. But we find that the estimated coefficient on the expected and unexpected change in the policy rate are negative and statistically significant. In the period of monetary policy easing, the estimated coefficient on the expected and unexpected change in the policy rate are negative but not statistically significant. In contrast, the period of monetary policy tightening, the estimated coefficient on the expected and unexpected change in the policy rate are negative and statistically significant.
Development of A Five Inter-Row Type Weeding Device for A Paddy Field Robot
( Gookhwan Kim ),( Daehyun Lee ),( Myunghoon Lee ),( Gilsu Han ),( Hyundong Lee ),( Youngki Hong ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Recently, eco-friendly agriculture has been spreading demand for safe food production in accordance with the increase of interest of people in health and environment. Manual work is the best way to remove weeds while reducing the use of herbicides, but it is time consuming and costly. This study introduced the structure and operation principle of a five inter-row type weeding device which physically removes weeds without herbicide, and tested and analyzed the performance of the device. This weeding device was covered with a polyethylene cover to prevent damage to the rice seedlings, and cutting blades were mounted in the inside of the cover to perform the weeding works. The blades were consisted of one 'L'-shaped form rotating blade and four fixed blades. The horizontal part of the rotating blade along with the fixed blade cuts weeds like scissors, and the vertical part is put into the topsoil and does a role to cut and stir the roots of weeds. The power of the weeding device is offered by the high torque through the Power Takeoff (PTO) of the robot. Since the rotating speed provided by the PTO is not enough to perform the weeding operation, the accelerator was mounted between the PTO of the robot and the rotating shaft of the weeding device to increase the rotation speed. The transmitted torque is distributed to each part of the weeding device composed of a five inter-row type through a system of pulleys and belts. An important consideration in developing a weeding device to use in a paddy field is how well the device follows the irregular and soft surface conditions like a paddy environment. To solve this problem, the weeding device was designed and manufactured with the following features. (1) A pair of rotating wheels were attached to both sides of the device so that the device could proceed stably along the irregular surface of a paddy field without sinking into the mud. (2) The weeding parts of five were connected to one rod to cope with the change of pitch angle which varies according to the state of the surface when both wheels run along the road surface of a paddy. (3) Even though both wheels run along the road surface, the roll angle is changed due to the difference in height of the both sides. To cope with this, a board-type spring and a roller-type bearing were mounted. (4) The brackets which both sides wheels are fixed are able to perform linear motion by up and down in accordance with the change in the height of the road surface together with the rod on which the devices were mounted. This weeding device was attached on the robot which can travel following rice seedlings rows in a paddy field, and performed weeding works. The result measuring the rate of weeding and the rate of rice seedlings damage, total amounts of cutting were 20.92kg, the rice seedlings were 0.22kg. The rate of the damage was just less 1.05%.
Development of A Dual Steering Type Orchard Robot Platform of Front-Rear Wheel for Unmanned Works
( Gookhwan Kim ),( Daehyun Lee ),( Myunghoon Lee ),( Gilsu Han ),( Hyundong Lee ),( Youngki Hong ),( Yunsu Do ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
When farm works are carried out in an orchard like apple and pear by machinery, there are many cases that the condition of the orchards is irregular and inclined. As a result, not only the number of farmers casualties caused by overturn of agricultural machinery and working devices is increasing, but also frequent damage due to excessive harmful pesticide inhalation of agricultural workers is occurring. To reduce these damages, we have developed a robotic platform that can carry out agriculture work while autonomously traveling in orchard. In the early stages of the development of the orchard robot, it was designed and manufactured to suit the size of general orchards (apple: 3~4m width and pear: 5~6m width) rather than making a robot which can apply to whole orchard. Also, irregular roads due to gravels and puddles are considered, but the slope is limited to a maximum of 10 degrees (except for terraced fields). The size of this robot developed for the unmanned work in orchard is 2.8 m(L) x 1.5 m(W) x 1.2 m(H) and the weight is 750 kg in the state without working devices. The maximum steering angle is ± 22 degrees. The distance between the front and rear wheels is 1.7 m, and the turning radius is about 3.11 m. Both front and rear wheels were equipped with each 1.5kW motor for driving of the robot and a worm gear type speed reducer is attached to the 750W motor for steering. One of the characteristics of the orchard robot proposed in this study is that it was designed and manufactured with a dual steering type of front and rear wheels. In the case of a general four-wheel moving vehicle, that is, a front or rear wheel steering type vehicle, in the process of following tree rows using sensors fixed to the robot, the direction angle of the robot is frequently being changed. Because of it, the robot gets moved zigzag form and the data for following of the tree row also must be modified in accordance with the change of the direction angle. It makes the follow of tree row be complicated. However, in the case of a dual steering type of front and rear wheels, when recognizing and following both sides tree row of the robot, the path following is executed in the method that both front and rear wheels are controlled simultaneously. That is, the robot moves in parallel shift without the change of the direction angle to follow the tree row. This not only makes it possible for the robot to travel accurately in the middle of the both sides tree row, but it also has the advantage of simplifying the calibration and path following algorithm of the sensor data.