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2차원 와이어 구동식 중량물 권양 시스템을 위한 퍼지 제어기 설계
이용찬(Yong-Chan Lee),이형준(Hyeng-Jun Lee),이연정(Yun-Jung Lee) 한국지능시스템학회 2015 한국지능시스템학회논문지 Vol.25 No.2
본 논문에서는 중량물을 들어 올리는 작업자를 돕기 위한 2차원 와이어 구동식 중량물 권양 시스템과 퍼지제어기를 제안한다. 2차원 와이어 구동식 중량물 권양 시스템은 사람이 전체 제어루프에 포함된 인간지원시스템의 일종이다. 기존 인간지원시스템 대부분의 제어 방식이 사용자의 특성을 고려하지 못하는 단점을 해결하기 위하여 물건을 들어 올리는 작업자의 힘을 덜어주어야 하는 요구조건과 사람의 작업 모션을 고려한 퍼지제어기 설계 방식을 제안한다. 실험을 통해 제안된 시스템의 2차원 작업 모션의 성능을 검증한다. A fuzzy controller and a 2-dimensional wire-driven heavy material lifting system helping human operator are proposed in this paper. The 2-dimensional wire-driven heavy material lifting system is a kind of human-assistive systems in which a human is involved in the control loop. Most of the existing human-assistive control systems cannot consider human operator’s characteristic. To consider human operator’s characteristic, human"s operating motion and requirement of reducing operator"s force to lift a heavy material are considered in the design process of the proposed fuzzy controller. The performance of the proposed system is verified by experiments.
이용찬(YC Lee),전종관(JK Jun),이현(H Lee),이재학(JH Lee),윤보현(BH Yoon),신희철(HC Shin) 대한산부인과학회 1996 Obstetrics & Gynecology Science Vol.39 No.11
Holoprosencephaly is a complex developmental abnormality of the brain arising from failure of cleavage of the prosencephalon during the fifth week of development. The prognosis of holoprosencephaly is generlaly grave. With recent development of high resolution ultrasonography, it is possible to detect fetus with holoprosencephaly antenatally. To ascertain clinical manifestations, we reviewed the records of 7 fetuses antenatally diagnosed as holoprosencephaly at Department of Obstetrics and Gynecology of Seoul National University Hospital from Nov. 1993 to Apr. 1996. The incidence of holoprosencephaly is 7/4,857(0.14%). Mean gestational age at diagnosis and delivery was 29 weeks of pregnancy(range from 17 to 37 weeks) and 30 weeks of pregnancy (range from 17 to 40 weeks), respectively. Modes of delivery were 1 cases of normal fullterm spontaneous delivery, 2 cases of preterm delivery, 2 cases of stillbirth, and 1 case of abortion. One case was lost after work-up for diagnosis and associated anomalies including targeted ultrasonography, fetal echocardiography, and karyotyping. Perinatal mortality was 83%(5/ 6) and only 1 case survived. Of 7 cases, 5 cases were alobar type and 2 cases were semilobar type. The frequency of associated anomaly was as follows: 5 cases of facial anomaly which were cyclopia, proboscis, single nostril, arhinia, and midline cleft lip and palate; 3 cases of cardiovascular anomaly; 2 cases of lung anomaly; 2 cases of limb anomaly; 1 case of gastrointestinal anomaly; 1 case of abdominal wall defect. Abnormal karyotypes were identified in 4 cases(57.1%) which include 2 cases of trisomy 13, 1 case of 46,XY, -13, M(+), and 1 case of 46, XX, 18p-. Fetus with holoprosencephaly shows a high incidence of associated anomaly and abnormal karyotyping. To predict prognosis accurately, it is desirable to confirm the diagnosis and type of holoprosencephaly and to find associated anoamly with high-resolution ultrasonography and to undergo fetal karyotyping.
Wire-driven hand rehabilitation system and its shared control for reflecting user‘s resistive force
Y. C. Lee(이용찬),Y. S. Lee(이영상),Y. J. Lee(이연정) 한국재활복지공학회 2019 재활복지공학회논문지 Vol.13 No.3
본 논문은 새로운 와이어 구동형 손 재활 시스템 및 사용자 반력을 고려한 공유 제어를 제시한다. 와이어 구동형 손 재활 시스템은 와이어에 연결된 골무형 커넥터에 세 손가락의 끝을 연결하여 재활 동작을 수행한다. 와이어와 풀리 배치를 변경하여 세 손가락 잡기, 가위질, 지두잡기 자세 등 다양한 작업 기반의 동작을 수행할 수 있다. 제안하는 공유 제어기는 안전성 보장을 위한 선형 위치 제어기와 사용자 반력 반영을 위한 장력 제어기로 구성되며 위치 오차에 관계없이 사용자 의도에 따라 장력과 위치 제어 권한을 조절할 수 있다. 세 손가락 작업 기반의 손가락 구동에 대해 사용자 반력의 유무에 따른 위치 제어 및 공유 제어실험을 통해 시스템 성능을 검증한다. This paper presents a new wire-driven hand rehabilitation system and its shared control for reflecting user’s resistive force. The wire-driven hand rehabilitation system performs rehabilitation by putting the fingertips on a thimble shaped connector which coupled to the wire. The system can perform a variety of task-oriented motions such as subterminal tridigital prehension, scissoring and subterminal opposition by changing the wire and pulley layout. The proposed shared controller consists of a linear position controller to ensure safety and a tension controller to reflect user resistive force. The shared controller can regulate tension and position control authority according to user’s intention regardless of position error. The system performance is verified by the position control and the shared control experiments with or without the user resistive force for the task-oriented three finger operation.
체외수정시술시 임신율 향상을 위한 새로운 요법 ( 변형장기요법 : MLL ) 에 관한 연구
이성구(Seong Goo Lee),이승민(Seoung Min Lee),이용찬(Yong Chan Lee),정재훈(Jae Hoon Jung),이원돈(Won Don Lee),임진호(Jin Ho Lim),장윤석(Yoon Suk Chang) 대한산부인과학회 2002 Obstetrics & Gynecology Science Vol.45 No.8
Objective : To evaluate the efficacy of new protocol (Modified luteal long; MLL protocol) to improve the clinical outcomes in IVF-ET. Methods : New protocol was applied to repeated ART failure group for 7 months (Group I , n=106) after informed consent. Outcomes of new protocol group were evaluated and compared to conventional long protocol group (Group Ⅱ, n=315) prospectively and compared to same indication group with Group I (Group Ⅲ, n=144) historical prospectively. Results : There were no differences in the clinical characteristics except patient`s age between Group I and II (35.16±4.35 vs. 33.22±4.14, p<0.05). Outcomes of IVF-ET, such as numbers of retrieved oocytes, numbers of transferred embryos, numbers of 2 PN, rates of ICSI, rates of blastocyst ET, rates of fertilization, ampules of gonadotropin between Group I & Ⅱ , and Group I & Ⅲ, respectively. But the embryo quality score of GroupⅡ was significantly higher than Group I . There was significant increase of implantation rate (25.2 vs. 17.1%, p=0.02) in Group II compared to Group I , especially in 31-35 years old group. Implantation rate of less than 35 years old group and clinical pregnancy rate of 31-35 years old group in Group Ⅱ tubal factor patients were significantly higher than Group I tuba] factor patients. Clinical pregnancy rate (47.2 vs. 12.8%, p=0.001) and implantation rate (15.2 vs. 5.5%, p=0,009) of Group I was significantly higher than Group Ⅲ, especially in 36-40 years old group. Implantation rates of ES factor patients (especially in 36-40 years old) and unknown factor patients (especially less than 35 years old), and clinical pregnancy rate of ES factor patients (especially in 36-40 years old) were significantly higher in Group I than Ⅲ. Conclusion : These results suggest that new protocol may play some role in the increase of endometrial receptivity. Further investigation, including molecular research work will be needed to clarify the factors concerned in the increase of implantation rate.
도파민 길항제에 치료 불응성인 기능성 소화불량증 환자에서 시사프리드의 효과
이상인(Sang In Lee),서원태(Won Tae Seo),박인서(In Suh Park),이용찬(Yong Chan Lee),이동기(Dong Gi Lee),이광재(Kwang Jae Lee),김도영(Do Young Kim),신용운(Yong Woon Shin),김영수(Young Soo Kijm),김범수(Pum Soo Kim),김동기(Dong Kee Kim) 대한소화기기능성질환·운동학회 2000 Journal of Neurogastroenterology and Motility (JNM Vol.6 No.2
N/A Background/Aims : Prokinetics are commonly used for the treatment of functional dyspesia, but their methods of action are different. First, we compared the efficacy and safety of the dopamine receptor antagonists, which were domperidone maleate and levosulpiride, in a 2 week treatment in functional dyspepsia, then investigated the efficacy and safety of cisapride tartrate in a 2 week treatment in those who were resistant to domperidone maleate or levosulpiride. Methods : One hundred Forty-nine patients, who were diagnosed with functional dyspepsia, were selected. The subjects were randomly divided into two groups, domperidone maleate (75) and levosupiride (74). Daily they took 30mg of domperidone maleate (DOM) or 75mg of levosulpiride (LEV) for 2 weeks. Then the subjects who didn't respond to these treatments took 30mg of cisapride tartrate for the following 2 weeks. Results : At week 0, the total symptom scores of the DOM group and LEV group were 8.01±2.57 and 8.14±2.65 respectively, which were not statistically different. At week 2, the total symptom scores of the DOM and LEV groups were significantly reduced to 4.28±3.30 and 4.85±3.53(p=0.0001). The efficacy rates of the DOM and LEV groups at week 2 were 50.8% vs. 44.1%. The rate of adverse events in the LEV groups was much higher than in the DOM group(17.7% vs. 8.0%). In addition the rate of change from normal to abnomal in prolactin level was markedly higher in the LEV than that of the DOM group(80.0% vs. 8.3%). After 2 weeks of treatment with cisapride tartrate, the total symptom score was significantly reduced to 3.77±2.49(p=0.0001), and the efficacy rate was 75.0%. The satisfaction of the resistant subjects in efficacy of cisapride compared with the previous treatment was 73.3%. The rate of adverse events of cisapride tartrate was 5.0%. Conclusions: Considering efficacy and safety of domperidone maleate and levosulpiride, domperidone maleate was the safer drug for the treatment of functional dyspepsia, and cisapride tartrate can be a useful drug in those patients who are resistant to dopamine antagonists like domperidone maleate and levosulpiride.
악골종양 환자에서 임프란트를 이용한 재건술에 관한 연구
이용찬(Yong Chan Lee),조병욱(Byoung Ouck Cho),W.Wagner 대한구강악안면외과학회 1998 대한구강악안면외과학회지 Vol.24 No.2
The results of implant therapy for the functional rehabilitation of tumor-patients are presented and discussed. It can be shown, that mandibular implants without osteoplasty show a similar low failure rate of about five percent as implants used in a control group of edentulous patients. Implants used in conjunction with osteoplasty and maxillary implants show a less favourable prognosis. Because of special problems and possible complications, especially in irradiated patients, we suggest a restrictive indication for implantations and a close follow-up of the patients.