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Image analytic study of nuclear area in mantle cell lymphoma
Taehwa Baek,허주령,곽형종,박미자,이혜경 대한혈액학회 2010 Blood Research Vol.45 No.3
Background Malignant lymphomas are classified on the basis of morphology, immunohistochemistry, and genetic and molecular biological features. Morphology is considered the most important and basic feature. Lymphomas can be classified as small, medium, or large depending on the cell size, but this criterion tends to be rather subjective. The aim of this study was to investigate the usefulness of an objective approach based on quantitative measurements. Methods Twenty specimens of mantle cell lymphoma and 2 specimens of the tonsil were examined. The nuclear area of 6,401 tumor cells of mantle cell lymphoma and 743 normal mantle cells of reactive tonsils were measured by 3 authors by using a user-controlled image-analyzer. The images of the nuclei were outlined using the spline method and the i-solution software, and the data were assessed using ANOVA and Student’s t-test. Results The mean nuclear areas of mantle cell lymphoma cells measured by the 3 authors were 37.9 [7.9] mm2, 37.9 [7.2] mm2, and 38.2 [7.7] mm2 and those of normal mantle cells in reactive tonsil were 28.6 [2.3] mm2, 28.8 [2.0] mm2, and 27.0 [3.0] mm2. There was no statistical difference between the 3 observations of mantle cell lymphoma (P=0.580) and normal tonsils. Conclusion For morphology, nuclear area is considered an important feature in the classification schemes of lymphoma. We showed that nuclear area measurement by using image analyzer can be used as an objective quantitative method. We think that nuclear morphometry may play a significant role in the diagnosis of lymphoma.
자동 비행 소형 무인 회전익항공기의 영상정보를 이용한 지상 이동물체 추적 연구
강태화(Taehwa Kang),백광열(Kwangyul Baek),목성훈(Sunghoon Mok),이원석(Wonsuk Lee),이동진(Dongjin Lee),임승한(Seunghan Lim),방효충(Hyochoong Bang) 한국항공우주학회 2010 韓國航空宇宙學會誌 Vol.38 No.5
본 논문에서는 소형 무인항공기에 영상 획득용 카메라를 장착하여 지상의 이동물체를 자동으로 추적하고 지상으로 영상정보를 지속적으로 전송하는 기술 및 관련 이론에 대한 연구를 다루고 있다. 본 연구에 사용된 회전익 무인항공기에는 소형·고성능의 영상획득 장치와 지상표적에 대한 식별·지향·자동추적 알고리즘이 탑재되었고 더욱 안정된 영상추적을 위해 영상 안정화 기법을 추가적으로 적용하였다. 최종적으로 모든 연구내용에 대해 비행시험을 수행하여 그 성능을 검증하였다. This paper presents an autonomous target tracking approach and technique for transmitting ground control station image periodically for an unmanned aerial vehicle using onboard gimbaled(pan-tilt) camera system. The miniature rotary UAV which was used in this study has a small, high-performance camera, improved target acquisition technique, and autonomous target tracking algorithm. Also in order to stabilize real-time image sequences, image stabilization algorithm was adopted. Finally the target tracking performance was verified through a real flight test.
Jin Ho Jang,Hye Ju Yeo,Taehwa Kim,Woo-Hyun Cho,Kyung Hoon Min,Sang-Bum Hong,Ae-Rin Baek,Hyun-Kyung Lee,Changhwan Kim,Youjin Chang,Hye Kyeong Park,Jee Youn Oh,Heung Bum Lee,Soohyun Bae,Jae Young Moon,유 대한내과학회 2022 The Korean Journal of Internal Medicine Vol.37 No.4
Background/Aims: Most studies on hospital-acquired pneumonia (HAP) have been conducted in intensive care unit (ICU) settings. This study aimed to investigate the microbiological and clinical characteristics of non-ICU-acquired pneumonia (NIAP) and to identify the factors affecting clinical outcomes in Korea. Methods: This multicenter retrospective cohort study was conducted in patients admitted to 13 tertiary hospitals between July 1, 2019 and December 31, 2019. Patients diagnosed with NIAP were included in this study. To assess the prognostic factors of NIAP, the study population was classified into treatment success and failure groups. Results: Of 526 patients with HAP, 379 were diagnosed with NIAP. Overall, the identified causative pathogen rate was 34.6% in the study population. Among the isolated organisms (n = 113), gram-negative bacilli were common pathogens (n = 91), such as Pseudomonas aeruginosa (n = 25), Acinetobacter baumannii (n = 23), and Klebsiella pneumoniae (n = 21). The multidrug resistance rates of A. baumannii, P. aeruginosa, and K. pneumoniae were 91.3%, 76.0%, and 57.1%, respectively. Treatment failure was significantly associated with K. pneumoniae (odds ratio [OR], 3.50; 95% confidence interval [CI], 1.35 to 9.05; p = 0.010), respiratory viruses (OR, 3.81; 95% CI, 1.34 to 10.82; p = 0.012), hematological malignancies (OR, 3.54; 95% CI, 1.57 to 8.00; p = 0.002), and adjunctive corticosteroid treatment (OR, 2.40; 95% CI, 1.27 to 4.52; p = 0.007). Conclusions: The causative pathogens of NIAP in Korea are predominantly gram-negative bacilli with a high rate of multidrug resistance. These were not different from the common pathogens of ICU-acquired pneumonia.
남용석,김태환,백승진,김승현,송석봉,Nam, Yongseo,Kim, Taehwa,Baek, Seungji,Kim, Seunghyu,Song, Seokbon 항공우주시스템공학회 2010 항공우주시스템공학회지 Vol.4 No.2
In General, the hydraulic system of T-50 Advanced Trainer is applied to flight control system, wheel & Brake system and fuel system for aircraft operation. The hydraulic system is operation with pressure of 3000psi. and many mechanical parts which is operated by hydraulic system has been stressed in incomplete environment same as heat and friction. for example, Oil leakage had occurred in the shutoff valve of FFP used in a certain period of time. After study, The crack progressed by fatigue due to the irregular hydraulic pressure and vibration has been identified as the reason of oil leakage. This paper presents life cycle extension plans of FFP shutoff valve by configuration improvements of shutoff valve and FFP hydraulic motor.