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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)
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류호형(Ho-hyeong Ryu),송병철(Byung Cheol Song) 한국방송·미디어공학회 2016 방송공학회논문지 Vol.21 No.2
This paper proposes a non-uniform de-blur algorithm using IMU sensor and a long/short exposure-time image pair to efficiently remove the blur phenomenon. Conventional blur kernel estimation algorithms using sensor information do not provide acceptable performance due to limitation of sensor performance. In order to overcome such a limitation, we present a kernel refinement step based on images having different exposure times which improves accuracy of the estimated kernel. Also, in order to figure out the phenomenon that conventional non-uniform de-blur algorithms suffer from severe degradation of visual quality in case of large blur kernels, this paper a homography-based residual de-convolution which can minimize quality degradation such as ringing artifacts during de-convolution. Experimental results show that the proposed algorithm is superior to the state-of-the-art methods in terms of subjective as well as objective visual quality.
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, Jae-Ryeon,Kim, Young-Shin,Kim, Hyeong-In,Lee, Heui-Jung,Lee, Won-Ho,Yoo, Mi-Ae 부산대학교 유전공학연구소 1996 분자생물학 연구보 Vol.12 No.-
D-raf, a Drosophila homolog of Raf - 1, functions as a signal transducer in cell proliferation and differentiation. The reporter plasmid p5'-1103 Draf-lacZ fused the Draf gene regulatory region (-1103~+300 with respect to the translation initiation site) with the lacZ gene in a P-element vector was constructed. Expression of the Draf-lacZ fusion gene was demonstrated in Kc cells by transient expression assay. Transgenic lines bearing Draf-lacZ fusion gene were established by P-element mediated transformation with the reporter plasmid. Spatial pattern of the Draf-lacZ expression in transgenic embryos and ovaries was similar to the distribution of the endogenous D-raf transcripts examined by in situ hybridization in previous study. We first report the expression of D-rsf gene in larval fat body analogous to the vertebrate liver and in testis and anterior ejaculatory duct of adult male. And our results show that the regulatory region is sufficient for expression of the D-raf gene. Draf-lacZ transgenic flies obtained in this study promise to be useful for studying multiple roles and regulation of expression of D-raf gene.