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자율 이동 로봇의 행동 학습을 위한 포섭 구조의 공진화
김현영,허광승,심귀보 중앙대학교정보통신연구소 2002 정보통신연구소논문집 Vol.4 No.1
본 논문에서는 자율 이동 로봇의 학습을 위해 신경망과 진화 알고리즘을 이용한 방법을 제안한다. 이것은 자연계의 생물이 진화와 학습을 통해 환경에 적응해 나가는 방식과 유사하다. 또한 본 논문에서는 행동기반 제어 방법인 포섭구조를 이용해 로봇의 행동을 제어하는 방법을 제안한다. 포섭구조는 행동규칙을 병렬적으로 모듈화 하여 낮은 레벨에서는 기본적인 행동을 담당하고, 높은 레벨에서는 좀 더 복잡한 행동을 담당하는 구조로 되어있다. 따라서 각 행동 레벨이 협조를 함으로써 복잡한 임무를 수행할 수 있다. 포섭구조에서 각 레벨의 제어기는 신경망으로 규정하며 각 행동 레벨이 서로 영향을 주고받으며 진화함으로써 주어진 임무를 달성하도록 한다. 제안된 방법은 자율 이동 로봇인 Khepera 로봇을 이용해 실제 환경에서 구현함으로서 그 유효성을 입증한다.
체외충격파 쇄석술 시행 후 5년 뒤 발생한 요관 협착 및 농신장 1예
이현승,권균홍,조용건,김봉진,임창섭,김자영,허동,임학 고신대학교의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.4
A 40-years-old woman was admitted to this hospital with flank pain and high grade fever for 2 weeks. As a matter of her past history, extracorporeal shock wave lithotripsy (ESWL) was performed for treatment of renal stones 5 years ago. Her abdominal CT findings were hydronephrosis with pyonephrosis and renal stones. Antibiotics administered for 5 days had no effects on her symptom improvement. A right ureteral stricture was noticed by ultrasonography follow up. We inserted double J stent and continued antibiotics therapy for 10 days, and then her fever was disappeared and flank pain was improved. ESWL is one of the most important treatment of renal and ureteral stone. However, its complications should not be negligible including bleeding, pain, ureteral obstruction, infection and so on. Complications of ESWL can be divided into acute and chronic courses. When we treat pyelonephritis patient with past history of ESWL, possibility of ureteral stricture must also be considered. In this study we report a case of pyelonephritis caused by ureteral stricture, possibly as a chronic complication of ESWL performed 5 years earlier
한명철,김정관,허승현,김성렬,김찬봉 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-
The acoustic emission (AE) sensor has been widely used for monitoring the machining states or tool abrasion, etc. This paper presents the relation between machining time and states such as tool abrasion for ceramic machining processes, which can be applicable to develop the dentistry machining center. A commercial PZT-type of AE sensor was used for experiments, and the aquisition data was analyzed in the AE signal strength versus machining time. The results show that it is possible to estimate the tool life and the ceramic machining state. In the future, additional experiments for various machining conditions such as depth of cut and feed rate are strongly necessary so as to design an effective monitoring system for the ceramic machining processes through detecting the AE signal.
여운철,조광현,이유신,허대석,이승철 ( Un Cheol Yeo,Kwang Hyun Cho,Yoo Shin Lee,Dae Seog Heo,Seung Chul Lee ) 대한피부과학회 1990 대한피부과학회지 Vol.28 No.5
A Case of Erythema Multiforme A ssociated with Malignant Lymphoma Un Cheol Yeo, M.D., Kwang Hyun Cho, M.D., Yoo Shin Lee, M.D., Dae Seog Heo*, M.D., Seoung Chul Lee**, M.D Department of Dermatology and Internal Medicine*, College of Medicine, Seoul National University, Seoul, Korea, Department of Dermatology**, College of Medicine, Inha University, Kyung Gi Do, Korea We report a case of erythema multiforme associated with malignant lymphoma. Fifty-six-year-old male patient visited our clinic complaining generalized skin lesions which were compatible with erythema multiforme clinically and histopathologically. The skin lesions were treatment-resistant, recurrent and persistent for 3 years. In consideration of old age, atypical features of erythema multiforme and no other demonstrable etiology of erythema multiforme, we studied for internal malignancy. Malignant lymphoma at the duodenum was revealed by UGI series, abdominal CT, and endoscopic biopsy. After chemotherapy, the tumor mass and active skin lesions were cleared simultaneously. Erythema multiforme may be regarded as one of the paraneoplastic syndromes.
Prevalence of Hepatitis C Virus Variants Resistant to NS5A Inhibitor in the Korean Population
( Seung Bum Lee ),( Ki Tae Yoon ),( Young Mi Hong ),( Mong Cho ),( Yang-hyun Baek ),( Won Lim ),( Hyun Young Woo ),( Jeong Heo ),( Nae-yun Heo ),( Sang Youn Hwang ) 대한간학회 2016 춘·추계 학술대회 (KASL) Vol.2016 No.1
Aims: Hepatitis C virus (HCV) is the second most prevalent causeof chronic hepatitis and related morbidity in Korea. A novel combinationtherapy of daclatasvir (NS5A replication complex inhibitor) andasunaprevir (NS3 protease inhibitor) has shown promising results forgenotype 1b chronic hepatitis C. But the response rates have been Table 1. Prevalence of amino acids substitutions for the resistance to NS5Ainhibitor. presented so differently according to NS5A polymorphisms and prevalenceof drug-resistant variants before treatment is not well knownyet in the Koran population.Methods: To detect HCV variants resistant to NS5A inhibitor in patientswith genotype 1b chronic hepatitis C and investigate clinical featureswith or without drug-resistant variants, amplification and direct sequencingof the HCV NS5A region was carried out on the 427 genotype1b chronic hepatitis C patients from multi-center cohort, whohad not received direct-acting antivirals before.Results: Amino-acid substitutions for resistance (L31 and/or Y93) weredetected in 51 of the 427 (11.4 %) patients, and Y93 (8.7 %) predominatedover L31 (2.9 %). However, baseline clinical characteristics andresponse to previous interferon based treatment were not differentaccording to the existence of drug-resistant variants.Conclusions: Mutations associated with resistance to NS5A inhibitorwere not uncommon in our study population. But drug-resistant variantsdid not affect clinical features. So it would be important tomonitor the baseline variants before the combination therapy of daclatasvirand asunaprevir for genotype 1b chronic hepatitis C.
Obstructive ileus caused by phlebosclerotic colitis
Seung Hyun Lee,Jong Wook Kim,Se Jin Park,Ju Yeol Heo,Woo Hyun Paik,Won Ki Bae,Nam-Hoon Kim,Kyung-Ah Kim,June Sung Lee 대한장연구학회 2016 Intestinal Research Vol.14 No.4
A 57-year-old man with chronic kidney disease and a history of using numerous herbal medications visited Inje University IlsanPaik Hospital for abdominal pain and vomiting. An abdominal radiograph showed diffuse small bowel distension containingmultiple air-fluid levels and extensive calcifications along the colon. Computed tomography showed colon wall thickeningwith diffuse calcification along the colonic mesenteric vein and colonic wall. Colonoscopy, performed without bowel preparation,showed bluish edematous mucosa from the transverse to the distal sigmoid colon, with multiple scar changes. At the midtransverse colon, a stricture was noted and the scope could not pass through. A biopsy of the stricture site revealed nonspecificchanges. The patient was diagnosed with phlebosclerotic colitis. After the colonoscopy, the obstructive ileus spontaneouslyresolved, and the patient was discharged without an operation. Currently, after 2 months of follow-up, the patient has remainedasymptomatic. Herein, we report the rare case of an obstructive ileus caused by phlebosclerotic colitis with a colon stricture.