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- 저자 : 이재웅(Jae Ung Lee) (검색결과 71 건)
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이재웅,장종욱,Lee, Jae-Ung,Jang, Jong-Wook 한국정보통신학회 2018 한국정보통신학회논문지 Vol.22 No.12
There has been a steady study of unmanned vehicle. So far, continuous research has brought news of the commercialization of unmanned vehicle. In addition, it has been applied in a variety of fields with another industry. A lot of research has been done, too, to apply inert driving indoors. Using LoRa network, which is a network dedicated to IoT, unmanned vehicle control system that is applied to LoRa network from a small space, or from an office hospital to a factory, is installed to increase efficiency when the performs special tasks. This paper presents solutions to a variety of problems by using LoRa network, which is dedicated to IoT, to recognize an unmanned vehicle as a single object, to communicate with surrounding objects, and to receive information necessary for driving indoors from a cloud server.
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디지털 병리 대장암 진단을 위한 삼중항 손실을 이용한 심층 메트릭 학습
이재웅(Jae Ung Lee),김경은(Kyung Eun Kim),송보람(Bo Ram Song),이주천(Ju Cheon Lee),Vuong Thi Le Trinh,Wang Jiamu,Syed Farhan Abbas,곽진태(Jin Tae Kwak) 대한전자공학회 2022 대한전자공학회 학술대회 Vol.2022 No.11
In this paper, we propose a deep metric learning classification model for colon cancer grading which aims to learn feature vector similarity by distance comparisons. The proposed method is evaluated on >9,800 colorectal image patches. The experimental results show that the method achieves 87.85% accuracy and 0.8425 F1-score, suggesting that the proposed learning method can improve histopathological analysis of cancer grade classification in pathological images.
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스트레인 게이지를 이용한 5만 DWT 석유화학제품 운반선의 횡진동 분석에 관한 연구
이재웅(Jae-Ung Lee) 한국마린엔지니어링학회 2016 한국마린엔지니어링학회지 Vol.40 No.4
During the initial stage of propulsion shaft design, the shaft alignment process includes a thorough consideration of lateral vibration to verify the operational safety of the shaft. However, a theoretical method for analyzing forced lateral vibrations has not been clearly established. The methods currently used in classification societies and international standards can only ensure a sufficient margin to avoid the blade-passing frequency resonance speed outside the range of ±20% of the maximum continuous rating (MCR) for the engine. Typically, in shaft alignment analyses, longer center distances between the support bearings promote affirmative results, but the blade order resonance speed can approach the lower limit for lateral vibration. Therefore, this matter requires careful attention by engineers, and a verification of the theoretical analysis by experimental measurements is highly desirable. In this study, both theoretical and experimental analyses were conducted using strain gauges under two draught conditions of vessels used as 50,000-DWT oil/chemical tankers, introduced recently as eco-friendly ships. Based on the analyses, the influence of the lateral vibration on the shafting system and the system’s reliability was reviewed.
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밸러스트 흘수 조건에서 5만톤급 석유화학제품 운반선의 엔진 부하에 따른 프로펠러 편심 추력이 축 거동 및 지지베어링에 미치는 영향 연구
이재웅(Jae-Ung Lee) 한국마린엔지니어링학회 2018 한국마린엔지니어링학회지 Vol.42 No.1
Generally, the propeller weight contributes significantly to the ships shafting system, and it has a substantial impact on the local support load of the after-stern tube bearing. Therefore, a series of studies on shaft alignment have been conducted to mitigate the magnitude and distribution of localized loads, focusing on reducing the relative inclination angle between the propeller shaft and the after-stern tube bearing under quasi-static conditions. However, some of the vessel shafts calculated in quasi-static conditions still incur damage at the after-stern tube bearing. Therefore, consideration of the dynamic state is needed for a more complete stability evaluation of the shafting system. Through this study, conducted considering the above background, research results revealed that propeller eccentric thrust force, which increases proportionally with engine load, is a major factor affecting shaft behavior of 50,000 deadweight class oil/chemical tankers. Furthermore, it was confirmed that the bearing support characteristics of the intermediate shaft bearings, which were not considered in the conventional shaft alignment, need to be further analyzed, in order to prevent damage due to misalignment and resonance.
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이재웅(Jae Ung Lee),이오영(Oh Young Lee),양석철(Suck Chul Yang),한동수(Dong Soo Han),손주현(Joo Hyun Sohn),김순길(Soon Kil Kim),김호중(Ho Jung Kim),고희관(Hee Kwan Koh),정자헌(Ja Hun Jung),남승우(Seung Woo Nam),백인규(In Kyu Paik),이창 대한내과학회 1997 대한내과학회지 Vol.52 No.1
Objectives: The degree of hyperkalemia and effects of potassium removal by hemodialysis on the plasma potassium concentration to see the influence of nonselective beta-adrenergic blockade(carteolol) and ACE inhibitor(captopril) on patients in maintenance hemodialysis were evaluated. Methods: This study was done on 16 patients with end-stage renal disease undergoing maintenance hemodialysis. These patients were classified two groups; group 1-patients with carteolol or captopril(9 patients) and group 2-patients without medication(7 patients). Measurement of plasma potassium and arterial blood gas analyses were performed at pre-dialysis and during hemodialysis(4 hours). To analysis the distribution of potassium kinetics during hemodialysis, dialysis potassium clearance rate was introduced in this study. Results: 1) Among 16 patients studied, the mean age was 43 years old and the ratio of male to female was 2: 1 and the mean duration of hemodialysis was 17.9 months. The underlying cause of end-stage renal disease was chronic glomerulonephritis in the most patients. 2) The mean predialysis plasma potassium concentration of all patients, group 1 on medication, and group 2 without medication was 5.13±1.04mEq/L, 5.67±1.01mEq/L and 4.410.55mEq/L, with high significance(p<0.001) between groups 1 and 2. 3) The mean postdialysis plasma potassium concentration of group 1 on medication and group 2 without medication was 348±0.40mEq/L and 3.39±0.56mEq/L with insignificance between groups 1 and 2. 4) The pre- and post-dialysis concentration of plasma sodium, pH and bicarbonate between group 1 and group 2 was similar except glucose. 5) Despite the fall in absolute plasma concentration in group 1 more than twice than in group 2, the difference in dialysis potassium clearance rate measured at 1 hour of hemodialysis in group 1 compared to that of group 2 was only 12M. Conclusion: These data are consistent with at least a two-compartment distribution of plasma potassium rather than single pool in addition to frequent hyperkalemia on maintenance hemodialysis on nonselective beta-adrenergic blocker or ACE inhibitor contributed to partial impairment of extrarenal transcellular shifts of potassium during inter- and intra-dialytic phase.
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스트레인 게이지를 이용한 5만 DWT급 석유화학제품운반선의 베어링 반력 및 선체변형량 분석에 관한 연구
이재웅(Jae-Ung Lee) 한국마린엔지니어링학회 2016 한국마린엔지니어링학회지 Vol.40 No.4
In modern ships, the shafting system often becomes stiff owing to the high engine power, whereas the hull structure becomes more flexible owing to optimization using high-tensile-strength thick steel plates; therefore, more sophisticated shaft alignments are required. In this study, strain gauge–based measurement was conducted under five vessel operating conditions and bearing reaction forces and hull deflections affecting shaft alignment were analyzed for a 50,000 dead weight tonnage oil/chemical tanker that has gained repute as an eco-friendly vessel in recent years. Furthermore, the analytical results from each technique—theoretical calculation, jacking ups, and strain gauges—were cross-checked against each other in order to enhance the degree of accuracy and reliability of the calculation.
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5만 DWT 석유화학제품운반선의 선체변형을 고려한 추진축계 정렬해석 연구
이재웅(Jae-Ung Lee) 한국마린엔지니어링학회 2016 한국마린엔지니어링학회지 Vol.40 No.3
The shaft system of a vessel becomes stiffer because of larger engine power, whereas the hull structure becomes more flexible because of scantling optimization conducted by using high-tensile thick steel plates. The draught-dependent deformation of the hull affects each bearing offset and reaction force comprising the subsequent shaft system. This is the reason that more sophisticated shaft alignments are required. In this study, an FE analysis performed under the expected operating conditions of two (2) vessels, as maximum draught change and to analyze the shaft alignment using the relative bearing offset change, which was derived from an FE analysis of the 50,000 DWT oil/chemical tanker, which has become an eco-friendly vessel in recent years. Based on this, the influence of the hull deflection on the bearing offset was reviewed against results for shaft alignment conditions.
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