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슈퍼커패시터용 멜라민 폼으로부터 질소가 자가 도핑된 다공성 탄소 재료의 제조
이병민,장형석,최재학,홍성권 한국재료학회 2021 한국재료학회지 Vol.31 No.5
Porous carbons have been widely used as electrode material for supercapacitors. However, commercial porous carbons, such as activated carbons, have low electrochemical performance. Nitrogen-doping is one of the most promising strategies to improve electrochemical performance of porous carbons. In this study, nitrogen self-doped porous carbon (NPC) is prepared from melamine foam by carbonization to improve the supercapacitive performance. The prepared NPC is characterized in terms of the chemical structures and elements, morphology, pore structures, and electrochemical performance. The results of the N2 physisorption measurement, X-ray diffraction, and Raman analyses reveal that the prepared NPC has bimodal pore structures and pseudo-graphite structures with nitrogen functionality. The NPC-based electrode exhibits a gravimetric capacitance of 153 F g−1 at 1 A g−1, a rate capability of 73.2 % at 10 A g−1, and an outstanding cycling ability of 97.85% after 10,000 cycles at 10 A g−1. Thus, the NPC prepared in this study can be applied as electrode material for high-performance supercapacitors.
이병민,정삼현,이동건 東亞大學校附設스포츠科學硏究所 2002 스포츠科學硏究論文集 Vol.20 No.-
Korean archery and chinese archery coincided with the origin of mankind. Bows were developed dramatically as shooting tools during the late Old Stone Age. Results of this study from comparison between Korean and Chinese archeries can be summarized as follows. Both of the archeries share their origin and their relevant ways of horse riding and stand-up. In Korean archery, ritual events are performed on a checker square to worship the heaven, the earth and the human being prior to arrow shooting. This is not found in Chinese archery. The two archeries are also different with each other in their materials. Finally, archery is a training for spiritual culture whose participants should do their best to discipline themselves and keep honest in daily life. In this selfish and mechanical society, archery should be established and developed as a popular and national sport through which people can make character training and enliven spirits facing the 21st century.
전기이중층 커패시터용 리그닌 유도 다공성 탄소 전극에 대한전자빔 조사 효과
이병민,정의민,최재학,홍성권 (사)한국방사선산업학회 2019 방사선산업학회지 Vol.13 No.3
In this study, electron beam irradiation effects on lignin-derived porous carbons forelectric double-layers capacitors (EDLCs) were demonstrated. Porous carbons (PCs) were preparedfrom lignin via carbonization, chemical activation, and electron beam irradiation. The carbonizedand activated PCs were irradiated with electron beams at various absorbed doses. Based on theanalytical results, the pore area and volume of the PCs increased with an increase in the absorbeddose. The PCs prepared at the optimum dose of 300 kGy showed the highest electrochemicalperformance of the EDLCs. These results indicate that the electron beam irradiation is an effectivemethod to increase the specific surface area and pore volumes of the PCs.
External validation of IBTR! 2.0 nomogram for prediction of ipsilateral breast tumor recurrence
이병민,장지석,조영업,박세호,박형석,김지예,손주혁,김건민,구자승,금기창,서창옥,김용배 대한방사선종양학회 2018 Radiation Oncology Journal Vol.36 No.2
Purpose: IBTR! 2.0 nomogram is web-based nomogram that predicts ipsilateral breast tumor recurrence (IBTR). We aimed to validate the IBTR! 2.0 using an external data set. Materials and Methods: The cohort consisted of 2,206 patients, who received breast conserving surgery and radiation therapy from 1992 to 2012 at our institution, where wide surgical excision is been routinely performed. Discrimination and calibration were used for assessing model performance. Patients with predicted 10-year IBTR risk based on an IBTR! 2.0 nomogram score of <3%, 3%–5%, 5%–10%, and >10% were assigned to groups 1, 2, 3, and 4, respectively. We also plotted calibration values to observe the actual IBTR rate against the nomogram-derived 10-year IBTR probabilities. Results: The median follow-up period was 73 months (range, 6 to 277 months). The area under the receiver operating characteristic curve was 0.607, showing poor accordance between the estimated and observed recurrence rate. Calibration plot confirmed that the IBTR! 2.0 nomogram predicted the 10-year IBTR risk higher than the observed IBTR rates in all groups. High discrepancies between nomogram IBTR predictions and observed IBTR rates were observed in overall risk groups. Compared with the original development dataset, our patients had fewer high grade tumors, less margin positivity, and less lymphovascular invasion, and more use of modern systemic therapies. Conclusions: IBTR! 2.0 nomogram seems to have the moderate discriminative ability with a tendency to over-estimating risk rate. Continued efforts are needed to ensure external applicability of published nomograms by validating the program using an external patient population.
경부 절개 접근을 통한 악하선 및 악하선관 다발성 타석 제거 1예
이병민,서진현,우승훈 대한이비인후과학회 2019 대한이비인후과학회지 두경부외과학 Vol.62 No.11
A calcified structure blocking the flow of saliva into the mouth is a major cause of salivarydysfunction. If a stone is detected, the goal of treatment would be to remove it. Furthermore,the fundamental treatment for preventing recurrence, although depending on the location andsize of the stone, is salivary gland resection. The submandibular gland duct and hilum stone isusually removed by transoral approach. If there are multiple stones in the submandibulargland and the duct, it would be necessary to carry out resection of submandibular gland, usingthe intra-oral approach. We recently experienced a case of multiple stone in the submandibulargland and the duct in a 73-year-old man, who presented with the right submandibular areaswelling after meals. We removed the submandibular gland and duct stone without intra-oralapproach and present this case with a review of the literature.