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부직포 공정의 섬유 직경 예측을 위한 Meltblown 수치해석적 연구
조경철,박병호,박시우,이인준,심재술 한국기계가공학회 2024 한국기계가공학회지 Vol.23 No.1
Periodic global pandemics of infectious diseases, such as COVID-19, have led to a surge of interest in health andsafety. In particular, the demand for personal hygiene masks that prevent the spread of viruses through non-contacttransmission via droplets is increasing. To improve the productivity and quality of nonwoven fabrics, which are themain materials composing personal hygiene masks, numerous studies have been conducted to predict fiber diameteraccording to the process conditions. However, considering the complex characteristics of nonwoven fabrics producedthrough mechanical, chemical, and thermal bonding, accurate prediction is difficult and involves multiple variables. Inthis study, the governing equation was simplified to a boundary value problem to predict the diameter of thenonwoven fabric produced by the melt-blowing method in the nonwoven fabric production process. The results werenumerically analyzed by comparing the diameter of the fiber produced through a 0.3 mm nozzle with a 1,800 MeltFlow Index (MFI). The results were compared with the results of scanning electron microscopy (SEM), polymerproperty model, and drag coefficient values, which are the main variables of nonwoven fabric production. Inaddition, a tendency analysis was performed through a statistical approach of the given error values, and a simplifiednonwoven fabric diameter prediction model using a correction factor was presented.
그리스도의 우주적 주권과 성도의 삶 에베소서의 윤리적 교훈의 기독론적 근거에 관한 연구
조경철 한국신약학회 2002 신약논단 Vol.9 No.3
Der Epheserbrief 1st ein deuteropaulinischer Brief. Seine Theologie kann in drei Themen zusammengefaBt werden Die Kirche, die das Soma Christi ist(Ekklesiologie), und ihr Haupt, Chritus(Christologie) und das Leben der Christen, die Glieder des Somas Christi sind (Ethik). Dieser Artikel behandelt das Verhatnis zwischen der Christologie und der Ethik im Epheserbrief. Die Christologie des Briefes kann in zwei Dimensionen geteilt werden. Einerseits sagt der Brief ganz deutlich die geschichtliche Aspekte des Christusereignisse, besonders die Kreuz-Christologie. Anderseits tritt der Brief die kosmischen Aspekte des Christusgeschehens hervor. die protologische Mittlerschaft Christi, die Vereinigung des Ails in Christus, die Sessio dextra Dei und Pleroma und Haupt des Ails. Diese beiden Aspekte der Christologie sind im Formel "In Christus" zusammengefaBt. Aber mir scheint noch wichtiger zu sein, daB der Brief beide Aspekte der Christologie fast immer mit seinen ethischen Paranesen in Verbindung bringt. Seine Theologie ist nicht nur eine Theorie, sondern steht immer im konkreten Lebenszusammenhang. Besonders sind die Kirche, die Familie und die Gesellschaft die wichtigen Interessen des Briefverfassers Die beide Aspekte der Christologie bieten seiner Ethik eine feste Basis. Durch die kosmische Dimension der Christologie wird die Ethik sogar eine kosmische, d.h. okumenische Ethik Christus ist der kosmische Herrscher, dessen Som die Kirche 1st. Die Christen, die die Glieder der Kirche sind, konnen und miissen gemaB der Christusliebe wandeln, so daB sie die Kirche bis auf den Haupt, Christus im Sessio dextra Del aufwachsen Lassen So hat die Ethik im Epheserbrief eine kosmische-cikumenische Dimension, aber nur in der Christologie. .
단일처리전 장일처리 기간이 온실재배 스프레이 절화국의 영양생장에 미치는 영향
조경철,이정현,한태호,정순주,백철기 한국생물환경조절학회 2002 생물환경조절학회지 Vol.11 No.4
본 실험은 정식 후 단일처리전 장일처리 기간에 따른 온실재배 스프레이 절화국 (cv. Reagan Improved)의 생육 및 건물생산에 미치는 영향을 구명하기 위하여 네덜란드 Wageningen 대학의 유리온실 실험포에서 수행하였다. 정식에서 개화기까지 3주 장일처리구에서는 84일이었고, 2주 처리구에서는 77일, 1주 처리구에서는 70일,단일처리 후에 최종수확일까지는 63일이 소요되었다. 정식 후 초장 생장량은 3주 장일처리구에서 가장 높았고, 1주 장일처리구에서 가장 낮았다. 또한 정식 후 최종 엽수, 엽면적 확보량 및 엽생체중과 총식물생체중은 3주 장일처리구에서 높고, 1주 장일처리구에서 낮은 결과를 나타내었다. 반면.단일처리 후 절대생장율에 있어서 엽전개속도와 초장생장속도는 모든 처리구에서 동일한 반응을 보였다. 최종건물생산량 (g.m$^{-2}$ )은 3주 장일처리구에서 높고, 1주 장일처리구에서 가장 낮게 나타났다. 초장과 생체중은 장일 조건이 길수록 높게 나타났으며,누적 건물중도 3주 장일처리구에서 가장 높은 결과를 나타냈다. This study was conducted to examine the effect of long-day (LD) period before short-day (SD) treatment on the vegetative growth of greenhouse-grown cut chrysanthemum cv. Reagan Improved at Wageningen Agricultural University, The Netherlands. Rooted cuttings of cut chrysanthemum cv, Reagan Improved were transplanted on 6th, 13th, 20th of September and all of them were treated with LD before SD treatment on 27th of September, The periods from transplanting until final harvest were 70, 77, and 84 days for 1, 2, and 3 week-LD treatment, respectively. The final plant height increased in the plot of 3 week-LD period and decreased in the plot of 1 week-LD period before the SD treatment. Total fresh weight and the leaf area were increased more in the plot of 3 week-LD period than that of 1 week-LD period, but the absolute growth rate after SD treatment was the same on plant growth rate and increase of the number of leaves in all treatments. The final dry matter production (g.m$^{-2}$ ) was increased more in the plot of 3 week-LD period than that of 1, 2week-LD period before SD treatment. Plant height and fresh weight were followed by the condition of LD period. In addition, dry mass production was highest in 3 week-LD period.