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Jung Yup Yang,Kap Soo Yoon,Won Joon Choi,Young Ho Do,Ju Hyung Kim,Chae Ok Kim,Jin Pyo Hong 한국물리학회 2007 Current Applied Physics Vol.7 No.2
Metaloxidesemiconductor structures (MOS) with the embedded Co nanoparticles (NPs) were eciently fabricated by utilizing anexternal laser irradiation technique for the application of nonvolatile memory. Images of high resolution transmission electron micros-copy measurements exhibited that the Co NPs of 5 nm in diameter were clearly embedded in SiO2 gate oxide. Capacitancevoltage mea-surements certainly exhibited at-band voltage shift of 2.2 V from 2 V to. capacitors with the embedded Co NPs were also studied as a function of tunnel oxide thickness to conrm the suitability of nonvolatilememory devices with metal NPs. The experimental results reveal that our unique laser process will give possible promise for experimentalecient formation or insertion of metal NPs inside the gate oxide.
New fabrication process of silicon quantum dots using external laser irradiation
Jung Yup Yang,Jin Pyo Hong,Chae Ok Kim,Eun Kyu Kim,Hyun Jung Kim,Kap Soo Yoon,Seong Ki Min,Si Ok Shon,Young Ho Do,Young Ju Park 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.1
We present an ecient technique for the formation of silicon quantum dots (Si QDs) by exposing a Nd: YAG laser (wavelength = 355 nm) onto amorphous Si lm. Primary emphasis is placed on the simple and direct fabrication of the Si QDs without performing any micro or nano-patterning process. The scanned laser irradiation of low power causes localized segregation of as-deposited lm by the laser-induced heat, resulting in the fabrication of Si QDs. Observations in scanning electron microscope and atomic force microscope system clearly conrm highly uniform and controllable nanoscale Si QDs in our case. The average size and density of the Si QDs were about 4 nm and 1.5 1012/cm2, respectively. In addition, optical and electrical properties of the Si QDs were investigated by photoluminescence and C-V measurements. The experimental results suggest that our new process can lead to very stable optical and electrical devices, with well controllable and reproducible Si QDs.
Jung Yup Yang,Jin Pyo Hong,Chae Ok Kim,Hyun Jung Kim,Kap Soo Yoon,Seong Ki Min,Si Ok Sohn,Young Ho Do 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.1
Magnetic properties of randomly oriented ferromagnetic cobalt nano dots were investigated as a function of dot diameter. Polycrystalline Co thin lm of 1 3 nm was at rst grown on Si substrate by a magnetron sputtering method and then followed by an ultraviolet laser exposure on as-grown Co thin lm in order to produce Co nano dots with dierent diameters. The Co dot size, density, and spacing (distance between dot and nearby dots) was intentionally controlled by initial deposition thickness under optimum laser conditions. Magnetic hysteresis and angle-dependent magnetization of Co nano dots were measured with superconducting quantum interference devices, a vibrating sample magnetometer and magnetic force microscopy. The observed results demonstrate that the coercivity, hysteresis loops, reversal mechanism and anisotropy properties were strongly in uenced by the exchange interaction with neighboring ferromagnetic nano dots.
[P539] A case of segmental vitiligo occurred on previous herpes zoster lesion as isotropic response
( Jung Yup Kim ),( Junghwa Yang ),( Yun Ho Lee ),( Sunmin Yim ),( Jae Yun Lim ),( Ju-yeon Choi ),( Han-saem Kim ),( Joon Hong Min ),( Young Jun Choi ),( Jae-hui Nam ),( Ga-young Lee ),( Won-serk Kim ) 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.1
“Wolf`s isotopic response” describes the occurrence of a new skin disorder at the site of another, unrelated and already healed skin disease. In most cases of isotopic response, the initial dermatosis is herpes zoster, herpes simplex, varicella, thrombophlebitis, scrofuloderma and striae distense. The most frequent second dermatoses are granulomatous reactions, particularly granuloma annulare, and lichenoid diseases. Various etiological reasons including viral, immunologic, neural causes have been put forth. We report here a case in which the second disease was segmental vitiligo that appeared over the same dermatomes of herpes zoster. A 71-year-old female presented with well-defined, depigmented patches on the left chest and back. She had been diagnosed with herpes zoster on same dermatomes and treated with antiviral agent 3 years ago. The histological examination showed decreased basal melanin pigments and melanocytes. Consequently, a diagnosis of segmental vitiligo occurred on previous herpes zoster lesion was made on the basis of the clinical and histological features.
Yang, Min Ho,Choi, Bong Gill,Park, HoSeok,Hong, Won Hi,Lee, Sang Yup,Park, Tae Jung WILEY-VCH Verlag 2010 Electroanalysis Vol.22 No.11
<P>Nanohybrids of chemically modified graphene (CMG) and ionic liquid (IL) were prepared by sonication to modify the electrode. The modified CMG-IL electrodes showed a higher current and smaller peak-to-peak potential separation than a bare electrode due to the promoted electron transfer rate. Furthermore, the glucose oxidase (GOx) immobilized on the modified electrode displayed direct electron transfer rate and symmetrical redox potentials with a linear relationship at different scan rates. The fabricated GOx/CMG-IL electrodes were developed selective glucose biosensor with respect to a sensitivity of 0.64 μA mM<SUP>−1</SUP>, detection limit of 0.376 mM, and response time of <5 s.</P>
[P481] A case of photodynamic therapy for actinic keratosis resistant to topical ingenol mebutate
( Jung Yup Kim ),( Junghwa Yang ),( Yun Ho Lee ),( Sunmin Yim ),( Jae Yun Lim ),( Ju-yeon Choi ),( Han-saem Kim ),( Joon Hong Min ),( Young Jun Choi ),( Jae-hui Nam ),( Ga-young Lee ),( Won-serk Kim ) 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.1
Actinic keratosis is a cutaneous lesion presenting as ill-defined, multiple erythematous or yellow-brown, dry, scaly plaques in sun exposed-areas in the middle aged or elderly. A 75-year-old female presented with multiple erythematous scaly patches on the face. The histological examination showed proliferation of slightly atypical keratinocytes at the basal cell layer with overlying parakeratosis, and variable dermal inflammation and solar elastosis. After actinic keratosis was confirmed, the patient underwent cryotherapy for 10 months. However, her clinical course waxed and waned with recurrent episodes. As a backup plan, ingenol mebutate (Picato<sup>®</sup>) was employed. Although her skin lesions were slightly improved, she complained of persistent itching on her face. Thereafter, topical methyl aminolevulinate photodynamic therapy (MAL-PDT) was attempted as an ultimate treatment option. Marked clinical improvement was observed after 3 weeks of treatment and no sign of recurrence has been reported for 4 months. Consequently, we report a case of actinic keratosis resistant to topical ingenol mebutate treated with MAL-PDT.