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고분자전해질형연료전지의 가스 채널 최적화를 위한수치적연구(Ⅰ)
주현철(Hyun Chul Ju) 대한기계학회 2008 大韓機械學會論文集B Vol.32 No.9
The performance and durability of Polymer Electrolyte Fuel Cells (PEFCs) are strongly influenced by the uniformity of current density, temperature, species distributions inside a cell In order to obtain uniform distributions in them, the optimal design of flowfield must be a key factor. In this paper, the numerical study of land/channel flowfield optimizations is performed, using a multi-dimensional, multi-phase, non-isothermal PEFC model. Numerical simulations reveal more uniform current density and HFR(High Frequency Resistance) distributions and thus better PEFC performance with narrower land/channel width where the less severe oxygen depletion effect near the land region and more uniform contact resistance variation along the in-plane direction are achieved. The present study elucidates detailed effects of land/channel width and assist in identifying optimal flow-field design strategies for the operation of PEFCs.
계지가작약탕(桂枝加芍藥湯)으로 치료된 편도 주위 농양 치험 1례
백상철,주현아,양현주,조은희,박민철,Baek, Sang-Chul,Joo, Hyun-A,Yang, Hyun-Ju,Jo, Eun-Hee,Park, Min-Cheol 대한한방안이비인후피부과학회 2011 한방안이비인후피부과학회지 Vol.24 No.3
Background and Objective : Peritonsillar abscess occurs when the bacterial infection of the palatine tonsil spreads to the potential peritonsillar space deep behind the tonsil. We observed and treated a case of peritonsillar abscess patient from a child acute tonsillitis. We present this case because there were no former reports of peritonsillar abscess treated by herbal medicine. Methods : We used herbal medication for 24 days. We diagnosed the patient through abdominal examination and have decided the treatment principle accordingly. We used the visual analogue scale(VAS). Results : After the treatment the grade of VAS was decreased and clinical symptoms were improved. Conclusions : Gejigajagyak-Tang in considerably effective on the treatment of pus of peritonsillar abscess.
BIM 모델 활용을 위한 360° 카메라 이미지의 객체 탐지 알고리즘 정확성 비교 연구
주현철,이주형,임종원,이재희,강인석,Hyun-Chul Joo,Ju-Hyeong Lee,Jong-Won Lim,Jae-Hee Lee,Leen-Seok Kang 한국토지주택공사 토지주택연구원 2023 LHI journal of land, housing, and urban affairs Vol.14 No.3
최근 건설산업 분야에 BIM 기술의 활용이 보편화되면서 3D 모델과 실제 시공 부위의 오류 확인 등을 위해 다양한 객체 탐지 알고리즘들이 활용되고 있다. 객체 탐지 기술은 건축물, 교량, 터널 등 건설시설물의 종류에 따라 객체 특성이 상이하므로 객체 탐지 기술도 적절한 방법을 사용할 필요가 있다. 또한 객체 탐지를 위해서는 초기 객체 이미지가 있어야 하며 이를 위해서도 드론, 스마트폰 등 다양한 방법으로 이미지 취득이 가능하다. 본 연구에서는 철도와 도로 시설의 터널 부위에 대하여 초기 이미지 구축을 위해 터널 내부 촬영에 최적화된 360° 카메라를 이용하여 이미지를 촬영하고, 촬영된 이미지로부터 실제 객체를 탐지하기 위한 객체 탐지 방법론으로 YOLO 알고리즘, SSD 알고리즘 및 R-CNN 알고리즘을 적용하여 방법론별 객체 탐지의 정확도를 비교 분석한다. 분석 결과 Faster R-CNN 알고리즘이 SSD, YOLO v5 알고리즘에 비해 높은 인식률 및 mAP 값을 가졌으며 인식률들의 최소·최대 값의 차이가 작아 균등한 검측 능력을 나타냈다. 이러한 연구는 철도와 도로 시설공사에 BIM 적용이 확산되고 있는 점을 고려하면 360° 카메라의 활용 방법 확대와 유지보수를 위한 터널 시설 부위의 객체 탐지 방법론 적용에 활용될 수 있다.
주현아,양현주,백상철,황충연,Joo, Hyun-A,Yang, Hyun-Ju,Baek, Sang-Chul,Hwang, Chung-Yeon 대한한방안이비인후피부과학회 2010 한방안이비인후피부과학회지 Vol.23 No.2
Objective : We investigated the effects of Oriental medical treatment on psoriasis which is a chronic disease. Methods : We applied acupuncture and herbal medicine to psoriasis patients. The progress of symptom is calculated using PASI(psoriasis area and severity) score and degree of itching is checked 0 to 3. Results : After oriental medical treatment, patients recovered from psoriasis without side effect. Conclusion : Oriental medical treatment can be a very effective way to treat psoriasis. The more patients we treat, the more clinical report is accumulated. Then it would be helpful to map out a systematic treatment on psoriasis.
삼황세제 가미방 화장품의 아토피 피부염 환자에 대한 임상적 연구
주현아,배현진,박민철,백상철,홍석훈,양현주,조현우,정수영,조정희,황충연,Joo, Hyun-A,Bae, Hyeon-Jin,Park, Min-Cheol,Baek, Sang-Chul,Hong, Seok-Hoon,Yang, Hyun-Ju,Cho, Hyun-Woo,Jung, Soo-Young,Cho, Jeong-Hee,Hwang, Chung-Yeon 대한한방안이비인후피부과학회 2012 한방안이비인후피부과학회지 Vol.25 No.3
Objective : The purpose of this study is to investigate the effect of cosmetic cream containing Samwhangsejegamibang Extracts on Atopic dermatitis patients. Methods : A total of 51 patients who visited Wonkwang Oriental Medical Center from April 8th, 2011 to October 8th, 2011 were included in this study. In this study, the patients were treated with Samwhangsejegamibang (experimental group) and placebo group. We observed scorad index, IGA, moisture content of skin, oil content of skin, wrinkled skin and hematological examination for 4 weeks. Results : 1. Comparison of changes in Scorad Index, depending on the perspective, the experimental group showed a statistically significant decline than the placebo group. 2. Comparison of change in IGA, depending on the perspective, the experimental group showed a statistically significant decline than the placebo group. 3. Comparison of change in moisture content, oil content of skin and wrinkled skin, both the experimental group and the placebo group showed level elevation but there was no statistically significant change. 4. Comparison of change in IgE and Eosinophil, both the experimental group and the placebo group showed no statistical significance. Conclusions : Considering the above experiments, it is suggested that cosmetic cream containing Samwhangsejegamibang extracts have a positive effect on atopic dermatitis patients.
양현주,주현아,백상철,박진수,홍석훈,Yang, Hyun-Ju,Joo, Hyun-A,Baek, Sang-Chul,Park, Jin-Soo,Hong, Seok-Hun 대한한방안이비인후피부과학회 2011 한방안이비인후피부과학회지 Vol.24 No.2
Objective : Recently interest of fermented herb medicine has increased in Oriental medicine. Herb medicine fermented in a proper condition resultingly has better or new virtue by microbe. This study was designed to compare the anti-inflammatory effects of herbal decoction and fermented herbal decoction in Hwangnyeonhaedok-tang (Huanglian fiedu-tang; HHT). Methods : The effects of HHT and FHHT on anti-inflammation were measured by production of NO and pro-inflammatory cytokine productions including TNF-${\alpha}$ and IL-1${\beta}$, IL-6 in LPS induced RAW 264.7 cells. Results : 1. Cell viability in three doses of HHT extract (0.01, 0.05 and 0.10 mg/ml) and two doses of FHHT extract (0.01, 0.05 mg/ml) was more than 70% and 80% each. 2. In RAW 264.7 cells, LPS displayed significant stimulatory effects on the production of NO. However, both HHT, FHHT showed significant inhibitory effects on the production of NO. 3. Pre-treatment by HHT in a various concentrations (0.01, 0.05, 0.10, 0.50mg/ml) reduced the elevated production of TNF-${\alpha}$, IL-1${\beta}$, IL-1${\beta}$ mRNA, IL-6 mRNA. More than 0.05mg/ml concentrations of HHT reduced the production of IL-6. And TNF-${\alpha}$, IL-1${\beta}$ level of mouse serum reduced in a various dose(0.1, 0.5, 1.0g/kg). 4. Pre-treatment by FHHT in a various concentrations (0.01, 0.05, 0.10, 0.50mg/ml) reduced the elevated production of TNF-${\alpha}$. More than 0.05mg/ml concentrations of FHHT reduced the expression of TNF-${\alpha}$ mRNA. 0.1, 0.50mg/ml concentrations of FHHT reduced the production of IL-6. And IL-1${\beta}$ level of mouse serum reduced in a various dose(0.1, 0.5, 1.0g/kg). Conclusions : These results indicated that both HHT and FHHT could have anti-inflammatory capacity by inhibiting the production of NO and cytokines in vitro. But HHT has more strong anti-inflammatory effects than that of FHHT in broad outlines.
벨마비 입원환자 35례에 대한 임상보고 조기 한방치료가 벨마비에서 House-Brackmann grade에 미치는 영향을 중심으로
양현주,주현아,백상철,박진수,홍석훈,Yang, Hyun-Ju,Joo, Hyun-A,Baek, Sang-Chul,Park, Jin-Soo,Hong, Seok-Hoon 대한한방안이비인후피부과학회 2011 한방안이비인후피부과학회지 Vol.24 No.3
Objective : This study was designed to evaluate the influence of time from onset of Bell's palsy until commenced Oriental medicine therapy on Bell's palsy. Methods : We investigated 35 cases of patients with peripheral facial palsy who visited Wonkwang University Oriental Hospital from 10th, December 2010 to 31st August, 2011 and classified them as time from onset of Bell's palsy until commenced Oriental medicine therapy. Time from onset of Bell's palsy until commenced Oriental medicine therapy of Group A was within 3 days. Group B was from 4 days to 8 days. We evaluate the treatment effect of each group by House-Brackmann grade before treatment and 1,3 week treatment. Results : 1. There was a statistical difference in period from onset of Bell's palsy until commenced Oriental medicine therapy between Group A and Group B. 2. There was a statistical difference after 1 week treatment in Group B. 3. There was a statistical difference after 3 weeks treatment in both Group A and B.3. After 3 week treatment, there was statistical significant difference in decreased value of House-Brackmann grade between Group A and Group B. Group A showed more recovery compared with Group B. Conclusions : 1. These results suggest that early oriental medicine treatment could be more effective in recovery of Bell's palsy. 2. Further studies will be required to identify the beneficial effect of early oriental medicine treatment in bell's palsy.