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이동렬,Lee, Dong-Ryeol,Irvine, Thomas F. 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.5
An investigation was carried out to determine experimentally the thermal conductivities of non-Newtonian fluids in a shear field. Both time independent purely viscous and viscoelastic fluids were considered. A coaxial cylinder apparatus with a rotating outer cylinder was used to establish the velocity field in the test fluid. First, the thermal conductivity of distilled water measured to validate the instrument. The experimental water data agreed within 1% of literature values and there was no effect of outer cylinder rotation (shear field). However, for non-Newtonian fluids such as aqueous CMC and Separan solutions, there were significant increases in thermal conductivities of up to 70% for CMC and 50% for Separan depending on the shear rate, polymer concentration and temperature. Considering the shear rate dependent thermal conductivity in the study of heat transfer in non-Newtonian fluids could be important. As in natural convection, the momentum and energy equations could no longer be solved separately but would have to be solved simultaneously.
자외선의 유해성 및 관련 규정과 올바른 자외선 차단제 사용에 대한 고찰
이동렬(Dong-Ryeol Lee),홍연지(Yeon-Ji Hong),김형걸(Hyung-Gual Kim),강철상(Chul-Sang Kang) 한국화장품미용학회 2016 한국화장품미용학회지 Vol.6 No.2
It has been reported that UV rays are harmful for skin in the view of not only photo-aging but promoting of skin-cancer. The aim of this article is to introduce the recent researches and new regulations, which are to come up with the harmfulness of UV irradiation. By dealing with the technical background of the regulations, UV filters and UV protection claims, it is introduced how to use sunscreen products appropriately as a consumer and how to develop the products by optimizing of the UV filter composition as a developer. Additionally, the recent research is described, which is about the optimized approach in order to deal with the paradox between the UV protection and the vitamin D formation.
엑스선 공명 자기 산란을 이용한 자성 다층박막 및 나노 구조체의 자기 구조와 자기 스위칭 메커니즘의 연구
이동렬(Dong Ryeol Lee) 한국자기학회 2010 韓國磁氣學會誌 Vol.20 No.4
X-ray resonant magnetic scattering (XRMS) allows us to extract magnetic depth profiles in magnetic multilayers and magnetization distribution in magnetic nanostructures in element-specific manner using x-ray reflectivity and diffraction. XRMS is explained with a brief introduction and examples of magnetic structures and magnetic switching mechanism in magnetic multilayers and nanostructures.
신장이식 환자에서의 ABO 부(副)-부적합에 의한 용혈성 빈혈
이동렬 ( Dong Ryeol Lee ),강화미 ( Hwa Mi Kang ),김민웅 ( Min Woong Kim ),김치훈 ( Chi Heun Kim ),박종환 ( Jong Hwan Park ),윤지훈 ( Ji Hoon Yoon ),공진민 ( Jin Min Kong ) 대한내과학회 2005 대한내과학회지 Vol.69 No.2
Background : Immune hemolysis secondary to ABO minor incompatibility is a rare graft versus host disease in renal recipients, secondary to anti-ABO antibody produced by lymphocytes of donor origin that reacts against recipient RBCs. Methods : To investigate the incidence and clinical features of immune hemolysis secondary to ABO minor incompatibility in renal allograft recipients, clinical records of 358 renal transplantation performed in Maryknoll Hospital since 1991 were analyzed retrospectively. Results : Fifty four (15%) of 358 renal transplants were ABO minor incompatible. Immune hemolysis secondary to anti-ABO antibody developed in 5 (9.2%) of 54 ABO minor incompatible renal transplant recipients. Immune hemolysis occurred in 3 (13.6%) patients among 22 allografts from blood type O donor to A recipients and 2 (10%) patients among 20 from blood type O donor to B recipients. All 5 patients received cyclosporin with prednisolone, and MMF was administered to one patient additionally. Immune hemolysis developed on 14±3 days after renal transplantation and lasted for about 10±3 days. The maximum reduction of hemoglobin was 3.3±1.0g/dL. All patients required donor type (blood type O) washed RBCs transfusion (5.0±2.6 units per patient) and plasmapheresis were performed in 3 patients (4.0±1.0 per patient). All patients recovered without deterioration of graft function. Age, number of HLA mismatch, creatinine at 1 year after transplantation, frequency of acute rejection and serum cyclosporin level during first 2 weeks were not significantly different between hemolysis group (N=5) and non-hemolysis group (N=49). Living unrelated transplantation is associated with increased incidence of immune hemolysis compared with living related transplantation (p<0.01). Conclusion : Although immune hemolysis secondary to ABO minor incompatibility is uncommon, we experienced cases with marked reduction of hemoglobin that required a large amount of transfusion. Therefore, this type of immune hemolysis needs to be considered as a differential diagnosis of posttransplant hemolysis. As our center routinely performs donor specific transfusion (DST), the incidence may be higher than that of other centers where DST is not usually given.(Korean J Med 69:177-182, 2005)
이동렬(Dong Ryeol Lee) 한국자기학회 2016 韓國磁氣學會誌 Vol.26 No.5
In Fe/Gd multilayers, patterning effect on the interlayer coupling was studied by comparing patterned and unpatterned samples that were cut from a multilayer film. A comparative study of the two samples via temperature dependent Gd-specific magnetization vector using X-ray magnetic circular dichroism (XMCD) shows that the temperature dependence of the Gd magnetization vector can be modified in the patterned sample due to a competition between the patterning and antiferromagnetic interlayer coupling effects.
최유정,이동렬,김윤,Choi, Yu Jung,Lee, Dong Ryeol,Kim, Yoon 강원대학교 산업기술연구소 2018 産業技術硏究 Vol.38 No.1
Recently, object detection is a critical function for any system that uses computer vision and is widely used in various fields such as video surveillance and self-driving cars. However, the conventional methods can not detect the objects clearly because of the dynamic background change in the beach. In this paper, we propose a new technique to detect humans correctly in the dynamic videos like shores. A new background modeling method that combines spatial GMM (Gaussian Mixture Model) and temporal GMM is proposed to make more correct background image. Also, the proposed method improve the accuracy of people detection by using SVM (Support Vector Machine) to classify people from the objects and KCF (Kernelized Correlation Filter) Tracker to track people continuously in the complicated environment. The experimental result shows that our method can work well for detection and tracking of objects in videos containing dynamic factors and situations.
지대경,임용규,이동렬,Ji, Dae-Gyeong,Im, Yong-Gyu,Lee, Dong-Ryeol 대한치과의사협회 1999 대한치과의사협회지 Vol.37 No.12
Whether congenitally abscent or lost as the of an accident or pathologic condition, missing lateral incisors present a problem. which complicates orthodontic treatment. The condition requires careful treatment planning and a consideration of the options and outcomes following either space closure or prosthetic replacement. Thos study prasents the clinical cases with maxillary lateral incisors missing. following optimal diagnosis and treatment planning , considerations in treatment in these cases.