9축 모션센서와 힘-감지저항센서 동기화를 이용한 비정상 보행 패턴 분석

유용규(Yong Kyu Yoo),원인식(In Sik Won),문상찬(Sang Chan Moon),양효실(Hyo Sill Yang),이순걸(Soon-Geul Lee),이원구(Won Gu Lee) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11

Abnormal gaits such as in-toeing gait and out-toeing gait have been known to cause various types of physiological disorders in human body. Therefore, many researches up to date have been dedicated to solve this issue. However, many of the previous researches have been limited in that they hardly considered a minimal use of sensors to analyze abnormal gaits, leading to a low efficiency due to unwanted power consumption. Here, we aimed to examine what parameters or axes of the sensors can be minimized to tell a minute difference between normal and abnormal gait patterns. For this purpose, we synchronized a 9-axes motion sensor (accelerator, gyroscope, and compass) with force sensing resistor (FSR) sensors to compartmentalize the valid measurement range between heel strike(initial contact of the foot) and toe off (final contact of the foot). Through this synchronization, we found out how the number of axes in sensors could be optimized for minimal power consumption which is necessary for manufacturing wearable healthcare devices at an affordable cost.

소화기; 조기위암에서 내시경점막하박리술 후 국소 재발의 위험인자

김정호 ( Jung Ho Kim ),이정현 ( Jung Hyun Lee ),정준원 ( Jun Won Chung ),안정석 ( Jung Suk An ),원인식 ( In Sik Won ),이지원 ( Ji Won Lee ),하민수 ( Min Su Ha ),김주승 ( Ju Seung Kim ),안홍대 ( Hong Dae Ahn ),박재찬 ( Jae Chan Par 대한내과학회 2013 대한내과학회지 Vol.85 No.3

목적: 내시경 점막하 박리술(endoscopic submucosal dissection, ESD)은 림프절 전이가 없는 조기위암에서 널리 시행되고 있는 치료 방법이다. 하지만 국소 재발과 관련된 위험인자에 관한 연구는 부족하다. 본 연구에서는 조기위암에서 ESD 후국소 재발의 위험인자를 알아보고자 하였다. 방법: 2008년 2월부터 2011년 7월까지 가천대 길병원에서 조기위암으로 진단받고 ESD를 시행받은 214명의 환자, 222예의 병변을 대상으로 의무기록을 후향적으로 검토하였다. ESD 후 추가적인 치료를 시행한 경우와 동일 부위 조기위암재발로 ESD를 2차로 시행한 경우 그리고 12개월 이내의 추적관찰이 시행된 경우를 제외하여 총 150예가 연구에 포함되었다. 결과: 평균연령은 63.9 ± 9.8이었으며 74.3%가 남자였다. 일괄 절제율은 139/150 (92.7%)이고 완전 절제율은 131/150(87.3%)이었다. ESD 시행 부위에서 국소 재발은 5예(3.3%)에서 발생하였으며 평균 추적관찰기간은 24개월이었다. 다변량 분석에서 수평 절제면 양성[HR: 13.12 (1.19-145.10); p =0.036], 분할 절제[HR: 25.31 (1.24-517.57); p = 0.036], 그리고 맥관 침습[HR: 485.06 (2.30-102449.79); p = 0.024]이 국소 재발의 독립적인 위험인자로 확인되었다. 결론: 조기위암의 ESD 후 국소 재발의 독립적인 위험인자는 수평 절제면 양성, 분할 절제, 그리고 맥관 침습으로 확인되었다. 그러므로 이러한 위험인자를 갖고 있는 환자들에서는 국소 재발을 조기에 확인할 수 있는 주의 깊은 추적관찰이 필요하다. Background/Aims: Endoscopic submucosal dissection (ESD) is a widely accepted method of treatment for early gastric cancer (EGC) without lymph node metastasis. However, there have been few studies about factors associated with local recurrence. The aim of our study was to evaluate the risk factors for local recurrence in patients with EGC after ESD. Methods: We retrospectively analyzed medical records of patients who underwent ESD of EGC at Gachon University Gil Medical Center. From February 2008 to July 2011, ESD for EGC was performed in 222 cases involving 214 patients. Patients with additional treatment after ESD, patients with recurred EGC, and patients with endoscopic follow-up of < 12 months were excluded. After exclusions, a total of 150 cases were included. Results: The mean age of the patients was 63.9 ± 9.8 years, and 74.3% were male. The en bloc resection rate was 139/150 (92.7%), and the complete resection rate was 131/150 (87.3%). Local recurrence at the ESD site was found in 5 cases (5/150, 3.3%) during a mean follow-up period of 24 months. In multivariate analysis, tumor involvement at the lateral resection margin [HR: 13.12 (1.19 - 145.10); p = 0.036], piecemeal resection [HR: 25.31 (1.24 - 517.57); p = 0.036], and lymphovascular invasion [HR: 485.06 (2.30 - 102449.79); p = 0.024] were associated with local recurrence after ESD. Conclusions: Local recurrence after ESD was significantly associated with involvement of the lateral resection margin, piecemeal resection, and lymphovascular invasion. Therefore, patients who have these risk factors should be followed up more carefully to detect local recurrence. (Korean J Med 2013;85:285-293)

가천의대 길병원에서 진단된 폐암 환자의 임상적 특성

신동복 ( Dong Bok Shin ),조은경 ( Eun Kyung Cho ),이재훈 ( Jae Hoon Lee ),박예민 ( Yae Min Park ),김명건 ( Myeong Gun Kim ),원인식 ( In Sik Won ),김유진 ( Yu Jin Kim ),경선영 ( Sun Young Kyung ),이상표 ( Sang Pyo Lee ),이재익 ( Ja 대한내과학회 2010 대한내과학회지 Vol.78 No.2

Background/Aims: This study examined the clinical characteristics of patients with lung cancer who were diagnosed at the Gachon University of Medicine and Science Gil Hospital from January 2006 to December 2008. Methods: The lung cancer data were downloaded from the hospital medical information system using cancer registration information. The patient clinical characteristics were analyzed retrospectively. Results: A total of 713 patients were diagnosed with lung cancer. Their median age was 69 years, 78.1% were over 60 years old, and 73.1% and 58.2% were men and smokers, respectively. Adenocarcinoma (32.7%) was the most common histologic type, followed by squamous carcinoma (25.9%), unclassifiable non-small-cell lung cancer (NSCLC) (17.3%), and small-cell carcinoma (SCLC) (15.0%). In the NSCLC group, the stage at diagnosis was IA (1.5%), IB (5.6%), ⅡA (1.3%), ⅡB (4.3%), IIIA (5.4%), ⅢB (23.1%), Ⅳ (47.7%), and unknown (11.1%). In the SCLC group, 20.6% of the patients were in the limited stage, 76.6% were in the extensive stage, and 2.8% were unknown. The patients were treated by surgery (9.8%), concurrent chemoradiotherapy (6.7%), radiotherapy only (5.9%), chemotherapy (32.4%), or best supportive care only (29.7%). The median overall survival was 15.3 months (95% CI, 11.5~19.1). The median survival based on histology was adenocarcinoma (35.0 months), squamous (13.5 months), NSCLC (14.2 months), and SCLC (11.8 months) (p=0.0445). Conclusions: Adenocarcinoma was the most common histologic type at our institute. Most patients were over 60 years of age (78.1%) and had stage Ⅲ/Ⅳ (76.3%) cancer. The survival of patients with adenocarcinoma was longer than that for the other histological types. (Korean J Med 78:215-221, 2010)

호두까기 증후군에서 정맥신우조영술로 진단된 요관주위 정맥류

김형수 ( Hyung Soo Kim ),박진웅 ( Jin Woong Park ),원인식 ( In Sik Won ),신권철 ( Kwen Chul Shin ),김세중 ( Se Joong Kim ),양재석 ( Jae Seok Yang ),이현희 ( Hyun Hee Lee ) 대한신장학회 2009 Kidney Research and Clinical Practice Vol.28 No.2

Renal pelvic and periureteral varices are rare cause of hematuria. On the intravenous pyelography, periureteral varices show a scalloped corkscrew-like appearance to the ureter without evidence of proximal obstruction. The cause of these varices includes renal vein thrombosis, obstruction of the inferior vena cava, congenital anomalies of the inferior vena cava or renal veins, infection, malignancy and nutcracker syndrome. We report a case of Periureteral Varices Diagnosed by Intravenous Pyelography caused by nutcracker syndrome.

정상면역환자에서 발생한 매독성 포도막염 1예

원인식,박예민,조현정,김형수,서종구,김진용,남동흔,박윤수,서일혜,조용균 대한감염학회 2009 감염과 화학요법 Vol.41 No.4

Syphilis is re-emerging worldwide due to the HIV epidemic. Prior to the introduction of penicillin, syphilis was the second most common primary cause of all cases of uveitis. Today, ocular syphilis is a rare disease, especially in an immunocompetent patient. Variable manifestation without pathognomonic signs of ocular syphilis often lead to delayed diagnosis, resulted in irreversibile loss of vision. In Korea, syphilitic uveitis has not been reported in an immunocompetent patient since 1984. We experienced a case of syphilitic uveitis in an immunocompetent man with visual deterioration. As the incidence of syphilis is increasing in these days, a high degree of clinical suspicion should be considered in patients with unexplained ocular inflammation and visual disturbances.

뇌농양으로 나타난 중추신경계 방선균증 1예

박예민,원인식,김주일,조현정,서종구,김진용,김은영,박상희,박윤수,서일혜,조용균 대한감염학회 2009 감염과 화학요법 Vol.41 No.4

Actinomyces normally colonizes the mouth, colon, and vagina. Although disruption of mucosa may lead to infection at virtually any site, central nervous system actinomycosis is rare. A 45-year-old man presented with seizure and magnetic resonance imaging showed brain abscess. He was diagnosed with actinomycotic and streptococcal infection of brain by histologic and microbiologic examination. After stereotactic aspiration and biopsy, he was treated successfully by prolonged antibiotic therapy using intravenous penicillin-G and oral amoxicillin.