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동문선(東文選)의 루정기(樓亭記)에서 본 고려(高麗) 중(中).후기(後期)의 루정건축고(樓亭建築考)
이용범,천득염,임영배,Lee, Yong-Bum,Cheon, Deuk-Youm,Lim, Young-Bai 한국건축역사학회 1993 건축역사연구 Vol.2 No.2
The Purpose of this study is to look for the total conspectus of Roo-Jong(RJ) Architecture in the middle and latter era of Koryo Dynasty. The method of this study is the review of old literature, the Roo-Jung description of Dong-Mun-Sun, which had compiled in the Ninth year of Seung-Jong (AD 1478) by confucian scholar. The conclusions of this study can be summarized as follows : 1) The main currents of thought having a great influence on the RJ are thought of Mountain God (or Sin Sun, which is dwelling in mountain) or Taoist, thought of Lao-tzu and Chuang-tzu. They had required the RJ Architecture to pursuit the life of God. In this existence value meaning, the RJ Architecturethe is the semi-sacred & profane space. In the being aspect, RJ is the transcendental architecture. 2) The way of life of in the RJ had strongly turned from the personal space, mainly mind control place, into the friendship-society space, pastime place. 3) The RJ had located after the images that is what should be. The images were formed on the ground of natural landscape elements, communication elements. And these elements were indicated on one's visual, auditorial sensation with oneself. 4) In planning aspect, the scope of visual, Pungsu and history were aided with the factors of climate, topography and geography. Specially in location and fabric planning, they had regarded more important the objects and scope of visual than the climate factor.
원통다관식 열교환기의 크기 및 형상 변화에 따른 설계 응력 연구
이용범(Yong-Bum Lee),한성건(Sung-Gun Han),고재명(Jae-Myoung Ko) 대한설비공학회 2008 설비공학 논문집 Vol.20 No.7
The present work aims to evaluate theoretically the axial, bending and equivalent stress of tube sheet, shell and tube stress, according to size, thickness and dimension of shell and tube heat exchangers. In addition, effects of stress due to variations of tube side and shell side temperature are investigated. Our ultimate purpose is to ensure safety of design products and develop new products rapidly. According to our results, first of all, the effective pressure, and stress of tube sheet and shell increase with an increment of the shell diameter and a decrement of tube temperature under constant shell temperature. Next, these decrease with an increment of the number of tube, shell thickness and shell temperature under constant tube temperature. Finally, the stress of tube row decrease when the equivalent stress of tube increases. Stress knowledge related to various parameters will be helpful for designers and manufacturers.
이용범(Yong-Bum Lee),이기천(Gi-Chun Lee),정동수(Dong-Soo Jung),이종직(Jong-jik Lee),김태석(Tae-Seok Kim) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
A planetary gear reducer is used in the Track Drive Unit (TDU) of a 100-ton excavator to convert the motor`s high-speed low-torque output into low-speed, high-torque. Because of the high reduction ratio, it is possible to generate a large torque, which is widely used in excavators, crane, automobile transmission and industrial machinery. Demand for ultra-large excavators has increased recently in the mining industry, large-scale civil engineering projects, and overseas markets such as China and India. Therefore, it is urgently required to secure high reliability for localization development and mounting on an expensive excavator. In this paper, the reliability evaluation method including the accelerated life test design for the planetary gear reducer for 100 ton excavator is presented and the test results are reviewed.
이용범(Yong Bum Lee),김광민(Kwang Min) 한국트라이볼로지학회 2013 한국윤활학회지(윤활학회지) Vol.29 No.1
Hydraulic transmission is the main component delivering power to the drive wheels of an excavator during forward and backward movement, and it has low speed, high torque and high speed, low torque gear change ratios as a forward/backward two-speed main function. It also has additional function of ensuring that the excavator is stably fixed on the ground with the built-in parking brake during excavation operations. In this study, optimal design specifications are determined by modeling and simulating about the multi-disc-type friction clutch, which is the main component improving the reliability of the hydraulic transmission for a 14-ton wheel excavator, and the friction properties of the transmission clutch are analyzed by performing sample tests.
ME 엔진의 배기밸브용 축압기의 N₂ 가스 모니터링 장치 개발
이용범(Yong-Bum Lee),이종직(Jong-Jik Lee),유한주(Han-Ju Yoo),최완수(Wan-Soo Choi) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
In the ME engine used in super large ships, the cylinder is operated intermittently to operate the exhaust valve by the hydraulic cylinder. Therefore, accumulator is used for energy saving and shock reduction. The large ME engine operates continuously at 3 to 4 Hz for several months and the pressure of the charge gas is very important. In this study, the N₂ gas monitoring system for the accumulator was developed to improve the efficiency and operational reliability of the ME engine demanding high operating frequency and service life.