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Ryu, Seung Wook,Lyeo, Ho-Ki,Lee, Jong Ho,Ahn, Young Bae,Kim, Gun Hwan,Kim, Choon Hwan,Kim, Soo Gil,Lee, Se-Ho,Kim, Ka Young,Kim, Jong Hyeop,Kim, Won,Hwang, Cheol Seong,Kim, Hyeong Joon IOP Pub 2011 Nanotechnology Vol.22 No.25
<P>This study examined the various physical, structural and electrical properties of SiO<SUB>2</SUB> doped Ge<SUB>2</SUB>Sb<SUB>2</SUB>Te<SUB>5</SUB> (SGST) films for phase change random access memory applications. Interestingly, SGST had a layered structure (LS) resulting from the inhomogeneous distribution of SiO<SUB>2</SUB> after annealing. The physical parameters able to affect the reset current of phase change memory (<I>I</I><SUB>res</SUB>) were predicted from the Joule heating and heat conservation equations. When SiO<SUB>2</SUB> was doped into GST, thermal conductivity largely decreased by ∼ 55%. The influence of SiO<SUB>2</SUB>-doping on <I>I</I><SUB>res</SUB> was examined using the test phase change memory cell. <I>I</I><SUB>res</SUB> was reduced by ∼ 45%. An electro-thermal simulation showed that the reduced thermal conductivity contributes to the improvement of cell efficiency as well as the reduction of <I>I</I><SUB>res</SUB>, while the increased dynamic resistance contributes only to the latter. The formation and presence of the LS thermal conductivity in the set state test cell after repeated switching was confirmed. </P>
Sang Hyeong Ryu,Sang Won Min,Jae Ho Kim,Ho Joong Jeong,Ghi Chan Kim,Dong Kyu Kim,Young-Joo Sim 대한재활의학회 2019 Annals of Rehabilitation Medicine Vol.43 No.1
Objective To find out whether levels of fibrin degradation products (FDP) and D-dimer are increased in breast cancer-related lymphedema (BCRL) as in many vascular diseases. FDP and D-dimer have been used in blood tests to help differentiate deep vein thrombosis in the diagnosis of lymphedema. Levels of FDP and D-dimer are often elevated in patients with BCRL. Methods Patients with BCRL (group I), non-lymphedema after breast cancer treatment (group II), and deep venous thrombosis (group III) from January 2012 to December 2016 were enrolled. Levels of FDP and D-dimer were measured in all groups and compared among groups. Results Mean values of FDP and D-dimer of group I were 5.614±12.387 and 1.179±2.408 μg/μL, respectively. These were significantly higher than their upper normal limits set in our institution. Levels of FDP or D-dimer were not significantly different between group I and group II. However, values of FDP and D-dimer in group III were significantly higher than those in group I. Conclusion Values of FDP and D-dimer were much higher in patients with thrombotic disease than those in patients with lymphedema. Thus, FDP and D-dimer can be used to differentiate between DVT and lymphedema. However, elevated levels of FDP or D-dimer cannot indicate the occurrence of lymphedema.
얼굴·목 아토피피부염에서의 0.1% Tacrolimus 연고 치료의 다기관 관찰연구
류형호 ( Hyeong Ho Ryu ),박영립 ( Young Lip Park ),김광호 ( Kwang Ho Kim ),이종희 ( Jong Hee Lee ),나정임 ( Jung Im Na ),조소연 ( So Yun Cho ) 대한피부과학회 2013 대한피부과학회지 Vol.51 No.11
Background: Atopic dermatitis (AD) is a chronic or chronically relapsing, inflammatory, pruritic skin disease. Because tacrolimus ointment does not induce skin atrophy, it is especially indicated in delicate areas such as the face, intertriginous areas and anogenital region. Objective: With the aim of investigating the differences between the established clinical guidelines and actual treatment response, an open-label, non-comparative, multicenter clinical observational study was undertaken. Methods: One hundred and fifty-three patients with AD in the head and neck area were treated with topical tacrolimus 0.1% twice daily. Clinical evaluations were conducted at baseline, week 4 and week 8. Efficacy was assessed through the investigator`s evaluation of the patients` individual signs (erythema, edema, oozing, excoriation, scaling, lichenification and fissuring) and symptoms (burning, pruritus and telangiectasia) using a 4-point grading system. The physician`s and patient`s global assessments and quality of sleep were also evaluated. Results: Among 153 enrolled patients, 25 (16.3%) were lost to follow-up, and 6 (3.9%) dropped out due to adverse events, leaving 79.7% of the population who completed the trial. Head and neck dermatitis was improved or cleared in 93.6% (week 4) and 94.4% (week 8) by physicians and in 92.1% (week 4) and 90.8% (week 8) by patients. Tacrolimus treatment improved the quality of sleep in head and neck dermatitis patients. Eighty-seven percent of the subjects were compliant, applying it at least 3 days per week. Burning sensation was the most frequently reported adverse event, followed by pruritus and aggravation of the lesion. Conclusion: Tacrolimus ointment 0.1% is a safe and effective treatment option for atopic dermatitis of head and neck including eyelids. (Korean J Dermatol 2013;51(11):851∼857)
류정호 ( Jeong Ho Ryu ),방형돈 ( Hyeong Don Bang ),김광호 ( Kwang Ho Kim ),김광중 ( Kwang Joong Kim ) 대한피부과학회 2003 대한피부과학회지 Vol.41 No.4
Juvenile xanthogranuloma(JXG) is a disorder of histiocytes usually associated with cutaneous lesions. JXG developing in soft tissue is rare and receives little attention. Therefore deeply located JXG may present a diagnostic difficulty in the absence of cutaneous lesions. Clinically, deep JXG seems to occur as solitary lesions on the trunk rather than on the head and neck region and tends to be composed of a monotonous population of histiocytic cells, with rare, if any, foamy macrophages or Touton-type multinucleated giant cells. We report an unusual case of JXG in a 4-month-old male infant who had a deep-seated mass located on the subcutaneous and muscle layer of the left forearm. (Korean J Dermatol 2003;41(4) : 479-483)
Ryu, Seung-Wook,Ahn, Young-Bae,Lee, Jong-Ho,Kim, Hyeong-Joon The Institute of Electronics and Information Engin 2011 Journal of semiconductor technology and science Vol.11 No.3
Thermal stability of $Ge_2Sb_2Te_5$ (GST) and $SiO_2$ doped GST (SGST) films for phase change random access memory applications was investigated by observing the change of surface roughness, layer density and composition of both films after isothermal annealing. After both GST and SGST films were annealed at $325^{\circ}C$ for 20 min, root mean square (RMS) surface roughness of GST was increased from 1.9 to 35.9 nm but that of SGST was almost unchanged. Layer density of GST also steeply decreased from 72.48 to 68.98 $g/cm^2$ and composition was largely varied from Ge : Sb : Te = 22.3 : 22.1 : 55.6 to 24.2 : 22.7 : 53.1, while those of SGST were almost unchanged. It was confirmed that the addition of a small amount of $SiO_2$ into GST film restricted the deterioration of physical and chemical properties of GST film, resulting in the better thermal stability after isothermal annealing.