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텀블강화형 스로틀 밸브 및 분리판에 의한 실린더내의 유동 특성에 관한 수치해석적 연구
장영우(Youngwoo Jang),고재경(Jaekyung Go),김창완(Chang-Wan Kim) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
Intensifying the tumble flow of the GDI engine is essential for improving the efficiency of the engine. In this study, we investigated in-cylinder flow characteristics by tumble intensifying throttle valve and separator. This was conducted through 3D transient flow analysis using computational fluid dynamics (CFD). The tumble intensifying throttle valve and separator generated reverse flow due to pressure difference inside the intake port and intensified the tumble flow. As a result, models with tumble intensifying throttle valve and separator improved Tumble Ratio (TR) and Turbulence Kinetic Energy (TKE) by 170% and 29.1%, respectively, compared to basic models.
방어와 굴 생식 후 발생한 장 폐색을 동반한 호산구성 위장염 1예
김준환 ( Joonhwan Kim ),장영우 ( Youngwoo Jang ),심정우 ( Jungwoo Shim ),유종욱 ( Jongwook Yu ),이상민 ( Sangmin Lee ),강신명 ( Shinmyung Kang ),이상표 ( Sangpyo Lee ) 대한천식알레르기학회(구 대한알레르기학회) 2016 Allergy Asthma & Respiratory Disease Vol.4 No.5
Eosinophilic gastroenteritis is a rare disease in which the symptoms are associated with eosinophilic infiltration in various layers of the gastrointestinal tract. A 56-year-old man complained of severe abdominal pain after eating yellow tail fish and oyster. There was no peripheral blood eosinophilia in the initial laboratory test. Abdominal computed tomography demonstrated circumferential wall thickening and dilatation of small intestine with ascites. An emergency laparotomy accompanied by segmental resection of the ileum and end-to-end anastomosis was performed. Histologically, there was a dense infiltration of eosinophils throughout the entire layers of ileal wall, through which this case could be diagnosed as eosinophilic enteritis. We did not prescribe systemic glucocorticosteroid, but asked him to avoid fish and oyster. He did not complain of recurrent gastrointestinal symptoms anymore after discharge. This is the case of eosinophilic gastroenteritis with intestinal obstruction requiring emergency surgery, which was developed or aggravated after ingestion of yellow tail fish and oyster that were suspected to be culprit foods. In patients with eosinophilic gastroenteritis, foods which are related to this abnormal condition should be identified and avoided to control this disease and prevent from aggravation or flare-up. (Allergy Asthma Respir Dis 2016:4:382-385)
딥러닝 모델을 이용한 휴대용 무선 초음파 영상에서의 경동맥 내중막 두께 자동 분할 알고리즘 개발
최자영,김영재,유경민,장영우,정욱진,김광기,Choi, Ja-Young,Kim, Young Jae,You, Kyung Min,Jang, Albert Youngwoo,Chung, Wook-Jin,Kim, Kwang Gi 대한의용생체공학회 2021 의공학회지 Vol.42 No.3
Measuring Intima-media thickness (IMT) with ultrasound images can help early detection of coronary artery disease. As a result, numerous machine learning studies have been conducted to measure IMT. However, most of these studies require several steps of pre-treatment to extract the boundary, and some require manual intervention, so they are not suitable for on-site treatment in urgent situations. in this paper, we propose to use deep learning networks U-Net, Attention U-Net, and Pretrained U-Net to automatically segment the intima-media complex. This study also applied the HE, HS, and CLAHE preprocessing technique to wireless portable ultrasound diagnostic device images. As a result, The average dice coefficient of HE applied Models is 71% and CLAHE applied Models is 70%, while the HS applied Models have improved as 72% dice coefficient. Among them, Pretrained U-Net showed the highest performance with an average of 74%. When comparing this with the mean value of IMT measured by Conventional wired ultrasound equipment, the highest correlation coefficient value was shown in the HS applied pretrained U-Net.
초음파내시경 유도하 세침 흡인 검사로 진단된 결핵 종격동 림프절염
김준환 ( Joonhwan Kim ),장영우 ( Youngwoo Jang ),김경오 ( Kyung Oh Kim ),김윤재 ( Yoon Jae Kim ),박동균 ( Dong Kyun Park ),정동해 ( Dong Hae Chung ),김은영 ( Eun Young Kim ),정준원 ( Jun-won Chung ) 대한소화기학회 2016 대한소화기학회지 Vol.68 No.6
Isolated mediastinal tuberculous lymphadenitis is clinically rare. Its clinical presentation may mimic an esophageal submucosal tumor by extrinsic compression. A 26-year-old woman was referred to our hospital for an esophageal subepithelial tumor. A 15×10 mm sized subepithelial lesion was found 30 cm from the upper incisors on esophagogastroduodenoscopy. We diagnosed the lesion as a submucosal tumor, and performed endoscopic ultrasonography-guided fine needle aspiration for a pathologic diagnosis. The histologic examination revealed granulomatous inflammation consistent with tuberculosis. We suggest that the use of endoscopic ultrasonography and fine needle aspiration may be helpful in making an early diagnosis and planning for an optimal treatment. (Korean J Gastroenterol 2016;68:312-316)
퇴행성 반월상 연골판 파열 환자의 한의학적 치료 효과와 Kellgren-Lawrence-grade, Body Mass Index의 상관성
이기언 ( Gi-eon Lee ),이건영 ( Geon-yeong Lee ),한시훈 ( Si-hoon Han ),김국범 ( Gook-beom Kim ),김효준 ( Hyo-jun Kim ),장재원 ( Jae-won Jang ),장영우 ( Youngwoo Jang ),조재흥 ( Jae-heung Cho ) 한방재활의학과학회 2018 한방재활의학과학회지 Vol.28 No.4
Objectives The aim of this study is to observe the effectiveness of complex Korean medicine treatment applied to the patients with degenerative meniscal tear and the correlation among clinical effectiveness, body mass index (BMI) and Kellgren-Lawrence grade (KL-grade). Methods The study participants were 38 patients who had been diagnosed with degenerative meniscal tear. Participants were classified by BMI, KL-grade and treated with acupuncture, electroacupuncture and pharmacopuncture. Clinical outcomes were assessed using Numeric Rating Scale (NRS), Western Ontario and McMaster Universities Arthritis Index (WOMAC Index) and EuroQol-5 Dimension Index (EQ-5D Index). Results Both NRS and WOMAC scores were significantly reduced after treatment (p <0.001). The EQ-5D for assessing quality of life showed further improvement (p<0.05). A statistically significant correlation was observed between the BMI and NRS, EQ-5D. KL-grade was correlated with WOMAC. Conclusions These results show that complex Korean medicine treatment to the patient with degenerative meniscal tear may be effective as a conservative therapy. Further research is required to confirm the effectiveness of Korean medicine treatment. (J Korean Med Rehabil 2018;28(4):71-79)