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채호철,변예은,이선태,임지혜,권오경,김완희 한국임상수의학회 2007 한국임상수의학회지 Vol.24 No.3
Mamary gland tumors are the most common neoplasms occurring in female dogs. The treatments of mammarygland tumors are surgery, chemotherapy, hormonal therapy and radiational therapy, but surgical removal remains widelyaccepted treatment option for mammary gland tumors. The purpose of this study is to evaluate clinical outcomes ofdogs which are performed surgical excision. Medical records were reviewed for dogs(79 cases) with mammary glandtumors treated surgically at Veterinary Medical Teaching Hospital in Seoul National University from 2001 to 2005.While 49 cases(62.0%) were benign, 30 cases(38.0%) were malignant tumors. The mean age of these dogs was 10.4years old(range 1~16 years). The maximal diameter of malignant tumors were various, whereas most of the benigntumors were smaller than 3 cm(36 cases, 73.5%). In 12 cases(15.2%), regional lymph nodes were enlarged and lymphnodes of 3 cases had resected surgically. The performed techniques were total mastectomy, regional mastectomy, simplemastectomy, lumpectomy and unilateral mastectomy in order. Twenty-eight cases(35.4%) had postoperative compli-cations consisted of recurrence of tumors, necrosis, dehiscence, delayed healing and edema of limbs. The recurrencerates of benign and malignant mamary gland tumors were 8 cases(16.3%) and 6 cases(20.0%). Metastasis rate wastechniques in this study, other complications such as edema of limbs, necrosis, dehiscence and delayed healing wereremarkable difference as surgical techniques. Therefore, this result suggest that choice of appropriate surgical techniquesshould be determined acording to each patient's physical status and characteristics of tumors.
다구찌 방법을 이용한 고속/정밀 위치제어시스템의 PID 제어게인 선정에 관한 연구
신호준,채호철,한창수 한국반도체디스플레이기술학회 2002 반도체디스플레이기술학회지 Vol.1 No.1
This paper presents a dynamic modeling and a robust PID controller design process for the wire bonder head assembly. For modeling elements, the system is divided into electrical part, magnetic part, and mechanical part. Each part is modeled using the bond graph method. The PID controller is used for high speed/high accuracy position control of the wire bonder assembly. The Taguchi method is used to obtain the more robust PID gain combinations than conventional one. This study makes use of an L18 array with three parameters varied on three levels. Results of simulations and experimental show that the designed PID controller provides a improved ratio of signal to noise and a reduced sensitivity improved to the conventional PID controller.