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고성림,한창규,서천석,김경배 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-
The tool geometry parameters and cutting process have complex relationships. Until now, various cutting test were needed to acquire optimal design of end mill for the purpose of high speed machining, due to the insufficient knowledge about cutting process in high speed machining. Using various tools with differentgeometry, relationships between tool geometry parameter (rake angle, clearance angle, length of cutter) and cutting process (cutting force, surface accuracy, surface roughness) have been studied. Acquired data can be used to design optimal tool for high speed machining
엔드밀 형상에 따른 가공특성 분석을 이용한 형상설계 S/W 개발
한창규,고성림,유중학,서천석,김경배 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
The tool geometry parameters and cutting process have complex relationships. Until now, various cutting test were needed to acquire optimal design of end mill for the purpose of high speed machining, due to the insufficient knowledge about cutting process in high speed machining. Using various tools with different geometry, relationships between tool geometry parameter (rake angle, clearance angle, length of cutter) and cutting process (cutting force, surface accuracy, surface roughness) have been studied. Acquired data can be used to design optimal tool for high speed machining and developed tool geometry design S/W.
한창규,고성림,서천석,김경배 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-
The tool geometry parameters and cutting process have complex relationships. Until now, various cutting test were needed to acquire optimal design of end mill for the purpose of high speed machining, due to the insufficient knowledge about cutting process in high speed machining. Using various tools with different geometry, relationships between tool geometry parameter (rake angle, clearance angle, length of cutter) and cutting process (cutting force, surface accuracy, surface roughness) have been studied. Acquired data can be used to design optimal tool for high speed machining and to develop a software for design of end mill geometry.
박현경,박성준,김명천,고영관 대한응급의학회 2001 대한응급의학회지 Vol.12 No.3
Background: lawsuits associated with medical troubles are increasing rapidly. Beginning with 69 cases in 1989, the annual rate of increase has reached above 36%. After the system of emergency medical specialist was born in 1995, it was expected that medical lawsuit cases would increase due to the importance of the emergency medical specialist's role to the emergent patients. Methods: A database was established for medical lawsuits(1982~1998, n=254), and lawsuits involving the emergency department(1982~1998, n=16) were selected from that database. Results: In criminal cases, the prosecutor's win rate was one out of four(25%). In civil cases, the prosecutor's win rate was 8 out of 10(80%); that is, the rate was higher than in general medical cases. Conclusion: To reduce the number of lawsuit following medical troubles in the emergency department, we should give careful attention and appropriate cure to patients who visit the emergency center.
Sung Cheon KO,Han Min WOO 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Metabolic engineering of cyanobacteria has received attention as a sustainable strategy to convert carbon dioxide to fatty acid-derived chemicals that are widely used in the food and chemical industries. Here we report a complete biosynthesis of ent-kaurene (ent-KN), ent-kaurenoic acid (ent-KA) from CO₂ in engineered cyanobacteria toward diterpenoids production of the calorie-free sweetener. To synthesize ent-KN, we designed the diterpene synthetic module (DS module) that a prenyl phosphate converts kaurene into the engineered cyanobacteria (the OverMEP modules) in which the methylerythritol 4-phosphate pathway was optimized to increase the precursors either farnesyl diphosphate (FPP) or geranylgernaly pyrophosphate (GGPP) from CO₂. ent-KN were detected in the cell extracts and medium by LC-MS. Next, we set out to produce ent-KA from ent-KN by reconstituting the cytochrome P450 module (CP module). Engineered S. elongatus PCC 7942 produced 2.9 ± 0.01 ㎎ L-1 ent-KA directly from CO₂, respectively. This study is the first report of photosynthetic production of ent-kaurenoic acid from CO₂ in cyanobacteria.
A Study on In-wheel Motor Control to Improve Vehicle Stability Using Human-in-the-Loop Simulation
Ko, Sung-Yeon,Ko, Ji-Weon,Lee, Sang-Moon,Cheon, Jae-Seung,Kim, Hyun-Soo The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.4
In this study, an integrated motor control algorithm for an in-wheel electric vehicle is suggested. It consists of slip control that controls the in-wheel motor torque using the road friction coefficient and slip ratio; yaw rate control that controls the in-wheel motor torque according to the road friction coefficient and the yaw rate error; and velocity control that controls the vehicle velocity by a weight factor based on the road friction coefficient and the yaw rate error. A co-simulator was developed, which combined the vehicle performance simulator based on MATLAB/Simulink and the vehicle model of CarSim. Based on the co-simulator, a human-in-the-loop simulation environment was constructed, in which a driver can directly control the steering wheel, the accelerator pedal, and the brake pedal in real time. The performance of the integrated motor control algorithm for the in-wheel electric vehicle was evaluated through human-in-the-loop simulations.
A Study on In-wheel Motor Control to Improve Vehicle Stability Using Human-in-the-Loop Simulation
Sung-Yeon Ko,Ji-Weon Ko,Sang-Moon Lee,Jae-Seung Cheon,Hyun-Soo Kim 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.4
In this study, an integrated motor control algorithm for an in-wheel electric vehicle is suggested. It consists of slip control that controls the in-wheel motor torque using the road friction coefficient and slip ratio; yaw rate control that controls the in-wheel motor torque according to the road friction coefficient and the yaw rate error; and velocity control that controls the vehicle velocity by a weight factor based on the road friction coefficient and the yaw rate error. A co-simulator was developed, which combined the vehicle performance simulator based on MATLAB/Simulink and the vehicle model of CarSim. Based on the co-simulator, a human-in-the-loop simulation environment was constructed, in which a driver can directly control the steering wheel, the accelerator pedal, and the brake pedal in real time. The performance of the integrated motor control algorithm for the in-wheel electric vehicle was evaluated through human-in-the-loop simulations.