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최진산,김민년,서정옥,배건성 한국음성과학회 1997 음성과학 Vol.2 No.-
Through iterative analysis and synthesis experiments on KOrean monosyllables, the Korean text-to-speech system was implemented using the phoneme-based formant synthesis method. Since the formants of initial and final consonants in this system showed many variations depending on the medial vowels, the database for each phoneme was made up of formants depending on the medial vowels as well as duration information of transition region. These techniques were needed to improve the intelligibility of synthetic speech. This paper investigates also methods of concatenating the synthesis units to improve the quality of synthetic speech. Keywords: formant synthesis, transition, conversion
조직공학적 신경재생을 위한 골수유래 간엽줄기세포의 신경세포화
최진산,강길선,이일우,이영무,이해방,이상진 한국생체재료학회 2002 생체재료학회지 Vol.6 No.4
Human bone marrow stromal cells (hMSCs) are multipotential stem cells that can be differentiated into mesenchymal cell types such as osteoblasts, chondrocytes, adipocytes, and muscle cells by controlling cytokines in culture medium. In this study, we found that undifferentiated cultures of hMSCs express some markers characteristic of neuronal cells such as neuron-specific enolase (NSE), neurofilament (NF), and vimentin. By treating hMSCs with -mercaptoethanol (BME) or dimethylsulfoxide (DMSO) and butylated hydrocyanisole (BHA) for neuronal differentiation, about 80% of the hMSCs differentiated into cells with a typical neuronal cell morphology and with neuronal phenotype expression of NSE and NF. In contrast, the differentiated hMSCs did not express markers of neuroglial cells such as S-100 protein. In conclusion, adult bone marrow stromal cells can be induced to overcome their mesenchymal fates and may constitute an abundant and accessible cellular reservoir for the treatment of neurologic diseases.
슈반씨세포와 염소산 처리된 PLGA 고분자 표면과의 상호작용 연구
최진산,이해방,강길선,이일우,이상진 한국생체재료학회 2002 생체재료학회지 Vol.6 No.1
Abstract-Neuroglial cells in the peripheral nervous system are Schwann cells. Neurons carry signals between the brain and the rest of the body, while the Schwann cells support the neurons while enhance the speed of electrical signals and produce essential proteins for neuron growth. The Schwann cells were prepared and purified from cultures of adult rat sciatic nerves by Morrissey's method. Cultured cells were confirmed by the expression of S-100 protein that is a specific maker for the Schwann cell. It has been recognized that adhesion and proliferation of cells on biodegradable polymers such as polyglycolide (PGA), polylactide (PLA), and poly(lactide-co-glycolide) (PLGA) depend on the surface properties. The chloric acid mixture solution treatment of PLGA film surfaces were developed to increase surface wettability. The changes of the water contact angle of the PLGA film surface gradually decreased with increase of chloric acid treatment time, owing to the oxygen-based functional groups incorporated on the surface by chloric acid treatment. In ESCA analysis, as chloric acid treatment time increased, carbon (binding energy, ~285 eV) ratio decreased in film surfaces whereas oxygen (~532 eV) ratio increased. The Schwann cells adhered for 1 day and grown for 2 days on the chloric acid-treated PLGA films were counted and observed by SEM. As the surface wettability increased, the number of the cell adhered and grown on the surface was increased. This result seems closely related with the serum protein adsorption on the surface; the serum proteins were also adsorbed more hydrophilic surface. In conclusion, this study demonstrated that the surface wettability of the biodegradable polymer plays an important role for cell adhesion and proliferation behavior for nerve regeneration
최진산,조재훈,우도현,황영훈,김일원,김태헌,안창원 한국전기전자재료학회 2021 전기전자재료학회논문지 Vol.34 No.5
For the last decades, a research hotspot for the halide perovskites (HPs) is now showing great progress in terms of improving efficiency for numerous photovoltaic devices (PVDs). However, it still faces challenges in the case of long-term stability in the air atmosphere. Defect-free high-quality HP single crystals show their promising properties for the remarkable development of highly efficient and stable PVDs. Here, we summarize the growth processing routes for the stable HP single crystals as well as briefly discuss the pros and cons of those well-established synthesis routes. Furthermore, we briefly include the comparison note between the HP single crystals and polycrystalline perovskite films regarding their device applications. Based on the future progress, the review concludes subjective perspectives and current challenges for the development of HPs high-quality PVDs.
강유전 세라믹의 전기장 인가에 따른 in situ X-선 회절 실험
최진산,김태헌,안창원 한국전기전자재료학회 2022 전기전자재료학회논문지 Vol.35 No.5
In functional materials, in situ experimental techniques as a function of external stimulus (e.g., electric field, magnetic field, light, etc.) or changes in ambient environments (e.g., temperature, humidity, pressure, etc.) are highly essential for analyzing how the physical properties of target materials are activated/evolved by the given stimulation. In particular, in situ electric-field-dependent X-ray diffraction (XRD) measurements have been extensively utilized for understanding the underlying mechanisms of the emerging electromechanical responses to external electric field in various ferroelectric, piezoelectric, and electrostrictive materials. This tutorial article briefly introduces basic principles/key concepts of in situ electric-field-dependent XRD analysis using a lab-scale XRD machine. We anticipate that the in situ XRD method provides a practical tool to systematically identify/monitor a structural modification of various electromechanical materials driven by applying an external electric field.