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예견 및 $H_{\infty}$ 제어기법에 의한 연속 냉간 압연시스템의 두께 제어
김승수,김종식,Kim, Sung-Su,Kim, Jong-Shik 제어로봇시스템학회 2000 제어·로봇·시스템학회 논문지 Vol.6 No.7
A robust controller to attenuate the various disturbances of tandem cold mills (TCM) is synthesized by measurement-feedback $H_{\infty}$ control techniques which can reflect the input direction of disturbances and the knowledge of entry thickness variation (disturbance) is synthesized by discrete-time measurement-feedback $H_{\infty}$ control theory. It is demonstrated that the $H_{\infty}$ preview control gain can be easily obtained by the seperation principle of the control and estimation problems in $H_{\infty}$ control. Finally the effectiveness of the proposed control method for TCM is evaluated by the computer simulation and compared to the other control methods which have been previously studied.
폴리카보네이트 사출성형에 따른 금형과 사출품에서 표면거칠기의 재현성 예측
홍수룡(Su Yong Hong),김승수(SungSu Kim),이상선(Sang Sun Lee),이지호(Ji Ho Lee),최원준(Wong Jun Choi),강명창(Myung Chang Kang) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.3
In this study, we evaluated the surface roughness of mold and injected parts manufactured by polycarbonate (PC) injection molding. The mold surface was polished to produce six differentiated roughnesses with 12 areas using stones (#800, #1200), sandpapers (#800, #1200), and diamond compounds (#8000, #14000). Injected parts were created using 20mm/s injection speed, 80 bar holding pressure for 5 seconds, and 70℃ cooling water. Injected parts surface roughness (Sa) was measured randomly in 10 of 30 using an interferometer (NewView8000, zygo, USA). In the same way, mold surface was measured randomly 10 times on 12 polished areas. Surface roughness of molds and injected parts were compared, and a regression equation to predict mold surface roughness was proposed for specific injection molding parameters.
증예(症例) : 골화성 근염에 동반된 심부정맥 혈전증 1례
나성일 ( Soung Il Na ),김승수 ( Seung Su Kim ),이동민 ( Dong Min Lee ),윤일용 ( Il Yong Yun ),문우성 ( Woo Sung Moon ),채재건 ( Jei Keon Chae ),김원호 ( Won Ho Kim ),고재기 ( Jae Ki Ko ) 전북대학교 의과학연구소 2002 全北醫大論文集 Vol.26 No.1
Myositis Ossificans is a benign ossifying soft-tissue lesion typically occurring within skeletal muscle. Patients are usually adolescents and young adults. Intraabdominal myositis ossificans is a very uncommon disorder. We experienced a case of myositis ossificans on the lateral wall of the left pelvis, which compressed left external iliac vein cause a deep vein thrombosis(DVT). A 68-year-old woman was admitted with a two-week history of severe lower abdominal pain and swelling of the left lower extrimety. The diagnosis was established with the Doppler ultrasound and pathologic examination. Several studies suggested that catheter-directed thrombolysis and stent placement are potentially attractive forms of therapy because they provide the opportunity for prompt restoration of venous patency and preservation of venous valve function. So we treated the deep vein thrombosis with catheter-directed thrombolysis and percutaneous transcatheter stent placement. We report a case of myositis ossificans presenting with DVT, who had a catheter-directed thrombolysis and percutaneous transcatheter stent placement.