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이병민,이영주,전희성 미래영어영문학회 2016 영어영문학 Vol.21 No.4
Before a new test can be implemented for operational use, extensive research is required to collect validity evidence that would support the use of scores from the new test. This paper describes two prototyping studies that were conducted as part of a test development project for a new general English listening comprehension test. The purpose of the prototyping studies was to make decisions about the selection of item types to be included in the test as well as to collect supporting evidence for a validity argument for the use of scores from the new listening test. The first prototyping study gathered evidence that would support the domain description inference, that is, whether the test tasks appropriately sample test takers’ general English listening comprehension ability. The second prototyping study also gathered evidence for the domain description inference but with a narrower focus on the specific configuration of one test task. For both studies, test takers' performance on shortened versions of the test and test takers' post-test questionnaire responses were examined. Results from the prototyping studies are presented, along with a description of how they informed decisions about items on the test as well as plans for further research that would produce additional validity evidence for the test.
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.
침전제 적하법을 이용한 $TiO_2$ 분말 제조 및 광촉매 특성
이병민,신대용,한상목 한국세라믹학회 2000 한국세라믹학회지 Vol.37 No.4
Hydrous titanium oxide particles with anatase phase were prepared from 0.05 mol TiCl4 solution using NH4HCO3 as precipitant by the droopping precipitant method. The sequential change of pH is completed by a sudden and steep increase in a pH value of the range of 6~7 to which the concentration of adsorbed OH- and H+ ions on TiO2 surface is equal. Rutile phase started precipitating with anatase phase as an increase of reaction temperature above 6$0^{\circ}C$ in aqueous 0.05mol TiCl4 solution and its specific surface area was found to decrease from 452 $m^2$/g($25^{\circ}C$) to 164$m^2$/g(8$0^{\circ}C$). Specific surface area decreased rapidly when anatase powders precipitated at 4$0^{\circ}C$ were heat-treated at temperature higher 40$0^{\circ}C$. FT-IR result confirmed that it was due to the decrease of OH species within hydrous titanium oxides. The loss of ethanol after illumination of the powder heated at $600^{\circ}C$ and $700^{\circ}C$ for 4 h was 66 and 68.8%, respectively.
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.
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.