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파장가변형 다이오드 레이저를 이용한 CO, CO₂ 농도의 동시계측
김동혁(Dong-Hyuck Kim),신명철(Myung-Chul Shin),김세원(Se-Won Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
This work focuses on the development of the diode-laser-based sensor system for CO and CO₂ detection. Each laser for CO and CO₂ measurement is worked at 1568nm and 1572.3㎚. Also use of fiber-coupled optical elements makes such a sensor rugged and easy to align. On-line data acquisition and processing can be performed with a PC running LabVIEW software. CO and CO₂ absorption signals are measured simultaneously by multiplexing method. And the mechanical vibration components in Multi-pass cell are applied to reduce the optical fringes's level. The effects of various conditions to enhance gas detection limit and accuracy on this system were investigated experimentally.
다이오드 레이저를 이용한 연소 배기가스의 농도 계측 기법 개발
김동혁(Dong-Hyuck Kim),신명철(Myung-Chul Shin),김세원(Se-Won Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
This work forcus on the development of gas measurement sensor about harmful exhaust gas using diode laser in the combustion environment. A diode laser sensor has been applied to monitor the combustion gases in combustion environment with absorption spectroscopy and fast extraction-sampling techniques. Species concentrations above combustion flow were determined from measured absorption in a fast-flow multipass absortion cell containing probe-sampled combustion gases. Also, To exchange the number density to concentrations, we need to the experimental equation . we obtain the equation and perform the calibration about each gas. In this paper, will compare accuracy and standard deviation between diode laser sensor and commercial gas sensor for CO₂ concentration in the combustion environment.
김동혁(Dong-Hyuck Kim),김세원(Se-Won Kim),신명철(Myung-Chul Shin),김용모(Yong-Mo Kim) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
This work forcus on the development of gas sensor that measure the concentrations of exhaust gas using diode laser. Each diode laser for exhaust gas measurement is set to work at near-IR using both DA and WMS methods. Also use of fiber-coupled optical elements makes such a sensor rugged and easy to align. On-line data acquisition and processing can be performed with a PC running LabVIEW software, and absorption signals are measured simultaneously by multiplexing method. Finally, It were experimentally compared WMS (Wavelength Modulation Spectroscopy) with DA (Direct Absorption) for the accuracy.
약물 관련 악골 괴사증(MRONJ) 환자에서 Pentoxifylline and Tocopherol의 효과: 문헌고찰
김무경(Moo-Kyeong Kim),김현제(Hyun-Je Kim),김동혁(Dong-Hyuck Kim),이의석(Eui-Seok Lee),임호경(Ho-Kyung Lim) 대한치과의사협회 2022 대한치과의사협회지 Vol.60 No.11
MRONJ (medication related osteonecrosis of the jaw) is a disease characterized by necrosis of the jaw that occurs after administration of anti-resorptive or anti-angiogenic drugs. However, etiology and effective treatment methods of MRONJ are not yet clearly identified. In this study, a systematic review was conducted to investigate the effects of pentoxifylline and tocopherol on MRONJ. A total of 5 clinical studies using pentoxifyllie and tocopherol in MRONJ patients among the papers registered in Pubmed/medline were reviewed. Pentoxifyllie and tocopherol were used for therapeutic purposes in 32 patients, and the mean age was 68 years for men and 74.21 years for women. Of the 32 patients, 20 patients were stage 2,11 patients were stage 3, and one patient was stage 0. In the most cases, the triggering factor was extraction. All patients complained of pain in the lesion area before drugs administration. The average follow-up period was 10.6 months. After drugs administration, 29 patients (90.6%) showed improvement in symptoms in terms of bone exposure and pain. Administration of pentoxifylline and tocopherol in MRONJ may improve symptoms of pain and bone exposure. However, it seems that additional studies on the appropriate use and dose, timing and duration of administration are needed.
신명철(Myung Chul Shin),김세원(Se Won Kim),김동혁(Dong Hyuck Kim) 한국연소학회 2006 한국연소학회지 Vol.11 No.3
This work forcus on the development of gas sensor that measure the concentrations of exhaust gas using diode laser. Each diode laser for exhaust gas measurement is set to work at near-IR using both DA and WMS methods. Also use of fiber-coupled optical elements makes such a sensor rugged and easy to align. The results showed that gas concentrations of O₂, CO, CO₂, NO are accurately measured within ±2% error. The application of WMS method increased the beam intensity 2-3 times higher than DA method. It were experimentally compared WMS (Wavelength Modulation Spectroscopy) with DA (Direct Absorption) for the accuracy.
관절염에 대한 resveratrol 적용의 치료 효과 리뷰 : 연구논문을 통한 동물 실험 고찰
현승철(Seung-Chul Hyun),권정욱(Jung-Wook Kwon),김동혁(Dong-Hyuck Kim),이의석(Eui-Seok Lee),임호경(Ho-Kyung Lim) 대한치과의사협회 2023 대한치과의사협회지 Vol.61 No.13
Temporomandibular disorders (TMD) are challenging to treat despite various existing methods. Stress on the temporo- mandibular joint (TMJ) leads to an accumulation of reactive oxygen species, promoting inflammation and cartilage degra- dation. Resveratrol, a natural polyphenol, inhibits inflammatory pathways and suppresses chondrocyte apoptosis, making it a promising candidate for TMD treatment. This review analyzes six studies with 3 kinds of animals on the intra-articular application of resveratrol for treating arthritis. This paper aims to elucidate the potential of resveratrol administrations into the articular cartilage to improve severity of arthritis, providing a foundation for future research and clinical investigations.
턱관절 장애 환자에서 턱관절 증식치료(Prolotherapy)의 효과 : 문헌고찰
권정욱(Jung-Wook Kwon),현승철(Seung-Chul Hyun),김동혁(Dong-Hyuck Kim),이의석(Eui-Seok Lee),임호경(Ho-Kyung Lim) 대한치과의사협회 2023 대한치과의사협회지 Vol.61 No.13
This paper reviewed prolotherapy as an approach to treating temporomandibular joint disorders (TMD), focusing on temporomandibular joint subluxation and hypermobility. Prolotherapy, commonly used in orthopedics, involves injecting substances like dextrose or lidocaine to promote healing in musculoskeletal conditions. Clinical studies in which this prolo- therapy was used for TMD were reviewed. Total 13 papers involving 372 patients (Male 90, Female 282) were examined, considering factors such as dextrose concentration (10%~50%), injection frequency (one to four times), injection period (one to four weeks) and injection sites. The assessment primarily focused on pain reduction and changes in maximum mouth opening after prolotherapy. In all papers, a consistent trend of pain reduction after prolotherapy was observed. Regarding maximum mouth opening, there were 6 cases of decreased range and 7 cases of increased range. With prolotherapys rec- ognition as a new medical technology for TMD, it emerges as a potential alternative treatment, highlighting its significance in the field.