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박두호(Doo Ho Park),최상욱(Sang wook Choi),강혜정(Hae Chung Kang),양영상(Young Sang Yang),임근우(Keun Woo Lim),김재성(Jae Sung Kim),서은주(Eun Joo Seo) 대한소화기학회 1988 대한소화기학회지 Vol.20 No.3
Heterotopic calcification and ossification are a well recognized but uncommon sequelae of abdomi- nal trauma. This condition may lead to discomfort and cause alarm, confusion and mistaken diagnosis; it may mimic a foreign body sensation. Its recognition, diagnosis and treatment, therefore, warrant emphasis. Two cases of heterotopic bone formations in abdominal scars were reported in Korea. We experi- enced a case who had had external trauma on abdomen 20 years before. After decades due to abdominal discomfort, pain and palpable mass the patient went through clinical evaluation and laparotomy was performed. The diagnosis of heterotopic calcification with bone formation was made. We present this case with a review of relevant literatures.
저 전력 블루투스 기반으로 의료데이터 전송 시 통신 거리와 연동 장치의 수가 데이터 손실률에 미치는 영향
박영상,손병진,손재범,이호열,정유수,송찬호,정의성,Park, Young-Sang,Son, ByeongJin,Son, Jaebum,Lee, Hoyul,Jeong, Yoosoo,Song, Chanho,Jung, Euisung 대한의용생체공학회 2021 의공학회지 Vol.42 No.6
Recently, the market for personal health care and medical devices based on Bluetooth Low Energy(BLE) has grown rapidly. BLE is being used in various medical data communication devices based on low power consumption and universal compatibility. However, since data errors occurring in the transmission of medical data can lead to medical accidents, it is necessary to analyze the causes of errors and study methods to reduce data error. In this paper, the minimum communication speed to be used in medical devices was set to at least 800 byte/sec based on the wireless electrocardiography regulations of the Ministry of Food and Drug Safety. And the data loss rate was tested when data was transmitted at a speed higher than 800 byte/sec. The factors that cause communication data error were classified, and the relationship between each factor and the data error rate was analyzed through experiments. When there were two or more activated peripherals connected to the central, data error occurred due to channel hopping and bottleneck, and the data error rate increased in proportion to the communication distance and the number of activated peripherals. Through this experiment, when the BLE is used in a medical device that intermittently transmits biosignal data, the risk of a medical accident is predicted to be low if the number of peripherals is 3 or less. But, it was determined that BLE would not be suitable for the development of a biosignal measuring device that must be continuously transmitted in real time, such as an electrocardiogram.
RRT와 SPP 경로 평활화를 이용한 자동주행 로봇의 경로 계획 및 장애물 회피 알고리즘
박영상(Yeong-Sang Park),이영삼(Young-Sam Lee) 제어로봇시스템학회 2016 제어·로봇·시스템학회 논문지 Vol.22 No.3
In this paper, we propose an improved path planning method and obstacle avoidance algorithm for two-wheel mobile robots, which can be effectively applied in an environment where obstacles can be represented by circles. Firstly, we briefly introduce the rapidly exploring random tree (RRT) and single polar polynomial (SPP) algorithm. Secondly, we present additional two methods for applying our proposed method. Thirdly, we propose a global path planning, smoothing and obstacle avoidance method that combines the RRT and SPP algorithms. Finally, we present a simulation using our proposed method and check the feasibility. This shows that proposed method is better than existing methods in terms of the optimality of the trajectory and the satisfaction of the kinematic constraints.
박영상,조상춘,김경남,김광만,최성호,문홍석,이용근,Park, Young-Sang,Cho, Sang-Choon,Kim, Kyoung-Nam,Kim, Kwang-Mahn,Choi, Seong-Ho,Moon, Hong-Seok,Lee, Yong-Keun The Korean Academy of Periodontoloy 2007 Journal of Periodontal & Implant Science Vol.37 No.2
손상된 부분 무치악제는 임플란트 식립에 많은 어려움을 야기한다. 이런 치조제의 손상은 외상성 발치, 안면 외상, 치근단 수술, 만성 치주염으로 인한 발거, 임플란트 실패 등에 기인하며, 특히 상악 전치부의 경우는 큰 좌절을 유발할 수 있다. 치조제 손상의 분류 및 임상 처리 방법에 대한 많은 보고가 있었으나, 수술에 앞서 방사선 영상을 통해 경조직을 평가하여 심미적이고 연조직과 조화로운 임플란트 시술을 위한 임플란트의 이상적인 수복 위치에 따른 분류법은 소개된 적이 없었다. 본 논문의 목적은 컴퓨터 단층촬영 분석을 이용하여 이상적 임플란트 수복위치에 따른 상악 전치부 치조제의 손상을 분류하고자 하는 것이다. 본 논문에서는 뉴욕대학교 치주${\cdot}$임플란트과의 데이터를 이용했으며, 다음 경우에 한하여 자료를 수집한 후, Simplant 8.0과 3.25(10mm의 가상 임플란트를 이용하여 55개의 증례를 통한 144개의 임플란트 수복 부위를 평가하였다. (1) 상실된 상악 전치부 증례만 포함 (2) 최소 2개의 인접 치아가 상실된 증례 (3) 원래의 치아 각도를 알 수 있는 최소 1개의 잔존 치아 존재 (4) 치아외형 형판을 컴퓨터 단층 촬영시 착용 분석 결과, 2mm 이상의 순측골을 가지며 열개나 창이 없는 경우를 제1군 A, 2mm 이하의 순측골을 가지며 열개나 창이 없는 경우를 제1군 B, 한쪽 편의 열개를 가지고 있고 창은 없는 경우를 제2군 A, 협/설측 모두 열개를 보이며 창은 없는 경우를 제2군 B, 열개는 없고 한쪽 편의 창을 보이는 경우를 제3군 A, 열개는 없고 협/설측 모두 창을 보이는 경우를 제3군 B, 열개 및 창을 모두 보이는 경우를 제4군을 분류하였다. 144개의 임플란트 수복 부위를 분류해보면, 제4군이 30.6%로 가장 많았으며, 제2군 A가 20.8%, 제1군 A가 19.4%, 제2군 B가 12.5%, 제1군 B가 10.4%, 제3군이 6.3% 순이었다. 제4군이 가장 많은 것은 초진시 치조제 변형을 감지하여 컴퓨터 촬영을 의뢰했기 때문으로 여겨진다. 본 연구에서 사용한 임플란트보다 큰 일반적 크기의 임플란트 적용시 더 많은 숫자의 치조제 손상을 보일 것으로 예상되므로, 임상가들은 이런 손상된 치조제 증례에서도 좋은 예후를 보일 수 있도록 정확한 진단과 골 증대술과 같은 수술적 접근법에도 익숙해질 수 있도록 노력해야 할 것이다. This study proposed a new classification system for maxillary anterior alveolar ridge deformities based on CAT-scan implant simulation as a useful concept in order to more precisely predict treatment outcomes and the necessity for ridge augmentation prior to implant placement. The results indicate that a high number of cases in the maxillary anterior area would require augmentation procedures in order to achieve ideal implant placement and restoration.
역전사 중합효소 연쇄반응 ( RT-PCR ) 에 의한 HCV-RNA 의 검출 Biotin 및 방사성옥소 표지 Primer 로 구성된 Kit 의 이용
문대혁(Dae Hyuk Moon),류진숙(Jin Sook Ryu),이영상(Young Sang Lee),정영화(Young Hwa Chung),천준홍(Jun Hong Cheon),정윤영(Yoon Young Chung),박흥동(Hung Dong Park) 대한핵의학회 1994 핵의학 분자영상 Vol.28 No.2
N/A This study was performed to evaiuate the clinical applicability of the reverse t.ranscription polymerase chain reaction (RT-PCR) kit of HCV-RNA using biotinylated and radioiodinat.ed primers. Study subjects were 118 patients with positive anti-HCV. HCV-RNA in patient.s serurn was ext.racted by guanidium thiocyanate method. After first amplification, the product. was reamplified by primers labelled with biotin and I-125. The final amplification product was de- tected by counting t,he radioactivity after incubation in avidin coated tubes. In 51 samples, t.he test was repeated for evaluation of reproducibility. This new method was also compared with conventional RT-PCR rnethods in 34 samples from patients with chronic liver disease. The results were as follows, 1) HCV-RNA was positive in 85(97%)of 88 patients with chronic liver disease, and in 23 (73%) of 30 pat.ients with normal liver function. 2) In comparison with conventional method, HCV-RNA was detected in 32(94%) of 34 patient.s with new method, whereas in 27(79% ) of the same group with conventional method, 3) Repeated test with new rnet.hod in 52 samples demonstrat.ed 82% of concordant result. In conclusion, new rnethod with biotinylated and radioiodinated primers was rnore sensitive than conventional method. However, great care must be taken for quality control because there were considerable interassay variat,ion and possiblity of false positivity and false negativity.