實學派의 實用主義 敎育思想에 關한 硏究

李達珩 명지대학교 인문과학연구소 1987 인문과학연구논총 Vol.4 No.-

시멘트 콘크리트 鋪裝에 對한 연구

張達淳 三陟大學校 1997 論文集 Vol.30 No.2

Korean pavement have been accomplished Asphalt pavement method mostly. But, according to rapid increase of cars and large-sized, it is raised that many problems about the common using and the persistent of existing Asphalt pavement. Also Asphalt price is increased rapidly by instability of the oil price. So cement-main material of the concrete pavement-paves a road with asphalt of Korean make. Therefore this study deals with the cement concrete pavement, according as maintenance and supervision is profitable and total lost is economical

우리 나라 잠재수명 손실년수에 관한 연구 : Focus on Alcohol

조진만,임달호 한국응급구조학회 1999 한국응급구조학회지 Vol.3 No.1

Objectives: This study sought to examine the impact of alcohol use and misuse on mortality in korea during the 1991-l997. Methods: Alcohol-Related Disease Impact estimation software and Korea vital statistics data were used to calculate alcohol related-mortality, mortality rates, and YPLL(years of potential life lost). The major findings are as follows : An estimated 23,528 Korean died during 1997 from causes related to alcohol. Such deaths accounted for 17,052(12.60%) of all deaths for men and 6,206(5.88%) for women. Motor vehicle accidents were major contributors to the total estimated number of alcohol related deaths and years of potential life lost before age 65. Alcohol related mortality rates were significantly higher for men. For men, major causes of the deaths were motor vehicle accidents(4,147 deaths, 17.90 per 100,000 population), cancer of the stomach(1,467 deaths,16.60 per 100,000 population) and chronic liver diseases and cirrhosis(1,233 deaths, 13.10). For women, the largest contributors to alcohol related mortality were motor vehicle accidents(1,509 deaths, 6.61), cerebrovascular diseases(1,114 deaths, 11.3) and cancer of the stomach(810 deaths, 8.24). Kleinman's method was used for obtaining on regional(Dongs, ups and Myons) differential of the alcohol related mortality in 1995, In general, The alcohol-related death rate for men was significantly higher than that for women, and the rate for ups and myons was significantly higher than that for dongs. During 1997, approximately 356,667(male: 282, 510, female: 74, 157)YPLL to age 65 and 572,708(male:424,338, female:148,370)YPLL to life expectancy were attributable to alcohol related causes. Men accounted for 79% of the total YPLL to age 65 and 74% of the total YPLL to life expectancy The major contributors to these alcohol related years lost were the diagnostic categories of unintentional injuries. Particullary, In male Motor vehicle accidents and accidental drowning-YPLL are considerably higher for other causes. Male-female YPLL differentials were greatest for mental disorder. Male-female mean-YPLL to age 65, accidental drowning(male;36.47, female;37.67) is higher for other causes. In both sexes, The YPLL and M-YPLL to life expectancy was significantly higher than the YPLL and M-YPLL to life expectancy.

Study and Analysis of Semiconductors for the Development of Two-layer Solar Cells

Jefry Mora,Jorge Ospina,Darío Amaya 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.11

In the field of renewable energies, researchers have always looked for the improvement of the conversion method in solar cells, due to the fact that only 14% of the electrical potential is being used. That is why in order to increase efficiency, different designs and materials have been studied. One of the most viable ways is the technology of multilayer solar cells, which the recent investigations focused due to the fact this technique allows the possibility of achieving efficiencies above 30%. Despite the above, the problem of this technique is the cost of manufacturing, which compared to the commercial cells, is inferior in benefit - cost relationship. For this reason, this paper shows a study of different semiconductors to design a two-layer solar cell, with the aim of selecting the best combination of semiconductors according to their own characteristics and results according to the described method.

A novel method for high-frequency transgenic shoot regeneration via Agrobacterium tumefaciens in flax (Linum usitatissimum L.)

Ramazan Beyaz,E. Selcen Darçın,Murat Aycan,Mustafa Kayan,Mustafa Yıldız 한국식물생명공학회 2016 JOURNAL OF PLANT BIOTECHNOLOGY Vol.43 No.2

In this study, routinely used transformation method, which includes transferring explants onto co-cultivation medium after inoculating them with bacterial solution for a while, was compared with 3 different inoculation methods. In every 3 methods, hypocotyl explants excised from 7-day-old sterile flax seedlings having cotyledon leaves and no root system dried under air flow in sterile cabin for 35 min were inoculated with different volumes of bacterial solution at different inoculation periods. GV2260 line of Agrobacterium tumefaciens having ‘pBIN 19’ plasmid containing npt II (neomycin phosphotransferase II) gene and GUS reporter gene was used in transformation studies. After inoculation, hypocotyl segments of seedlings (0.5 cm in length) - were excised and left to co-cultivation for 2 days. Then, explants were transferred to regeneration medium supplemented with different antibiotics. The presence of npt-II and GUS genes in transformants was confirmed by PCR and GUS analysis. The highest results in all characters examined in all cultivars were obtained from the 2 inoculation method in which hypocotyls excised from seedlings inoculated with 500 μl of bacterial solution after drying in sterile cabin for 35 min were used.

활성탄에 의한 카페인 및 니코틴의 흡착특성

손진언,이성식,김달한,유명호,이만식 동아대학교 환경문제연구소 1994 硏究報告 Vol.17 No.1

Adsorption equilibrium and kinetics of Caffeine and Nicotine from aqueous solution on activated carbon were determined experimentally in a batch system. Then, the equilibrium data were expressed by the Freundlich type and the equilibrium constants were obtained. Diffusion coefficient were determined by comparing experimental decay curve with theoretical ones. Surface diffusion was consided to be dominant and the value of diffusion coefficient were depent of the amount adsorbed and the equilibrium concentration. Domestic activated carbon has nearly same amount of adsorption as imported activated carbon made by CALGON carbon Corp.

Evaluation of an Active Humidification System for Inspired Gas

Nicolás G. Roux,Gustavo A. Plotnikow,Darío S. Villalba,Emiliano Gogniat,Vivivana Feld,Noelia Ribero Vairo,Marisa Sartore,Mauro Bosso,José L. Scapellato,Dante Intile,Fernando Planells,Diego Noval,Pablo 대한이비인후과학회 2015 Clinical and Experimental Otorhinolaryngology Vol.8 No.1

Objectives. The effectiveness of the active humidification systems (AHS) in patients already weaned from mechanical ventilation and with an artificial airway has not been very well described. The objective of this study was to evaluate the performance of an AHS in chronically tracheostomized and spontaneously breathing patients. Methods. Measurements were quantified at three levels of temperature (Tº) of the AHS: level I, low; level II, middle; and level III, high and at different flow levels (20 to 60 L/minute). Statistical analysis of repeated measurements was performed using analysis of variance and significance was set at a P<0.05. Results. While the lowest temperature setting (level I) did not condition gas to the minimum recommended values for any of the flows that were used, the medium temperature setting (level II) only conditioned gas with flows of 20 and 30 L/minute. Finally, at the highest temperature setting (level III), every flow reached the minimum absolute humidity (AH) recommended of 30 mg/L. Conclusion. According to our results, to obtain appropiate relative humidity, AH and T° of gas one should have a device that maintains water T° at least at 53°C for flows between 20 and 30 L/m, or at T° of 61°C at any flow rate.

Association between cigarette smoking and the prevalence of post-endodontic periapical pathology: a systematic review and meta-analysis

Ríos-Osorio Néstor,Muñoz-Alvear Hernan Darío,Jiménez-Castellanos Fabio Andrés,Quijano-Guauque Sara,Jiménez-Peña Oscar,García-Perdomo Herney Andrés,Caviedes-Bucheli Javier 대한치과보존학회 2022 Restorative Dentistry & Endodontics Vol.47 No.3

Objectives This systematic review and meta-analysis aimed to assess the association of cigarette smoking with the prevalence of post-endodontic apical periodontitis in humans. Materials and Methods We searched through PubMed/Medline, Web of Science, and Scopus from inception to December 2020. Risk of bias was performed by using the Newcastle-Ottawa Scale for cross-sectional, cohort, and case-control studies. We performed the statistical analysis in Review Manager 5.3 (RevMan 5.3). Results 6 studies met the inclusion criteria for qualitative and quantitative synthesis. Statistical analysis of these studies suggests that there were no differences in the prevalence of post endodontic apical periodontitis (AP) when comparing non-smokers vs smoker subjects regarding patients (odds ratio [OR], 0.68; 95% confidence interval [CI], 0.31–1.49; I2 = 58%) and teeth (OR, 1.71; 95% CI, 0.99–2.93; I2 = 72%). Conclusions Our findings suggest that there was no association between cigarette smoking and post-endodontic apical periodontitis, as we did not find statistical differences in the prevalence of post-endodontic AP when comparing non-smokers vs smoker subjects. Therefore, smoking should not be considered a risk factor associated with endodontic failure. Objectives This systematic review and meta-analysis aimed to assess the association of cigarette smoking with the prevalence of post-endodontic apical periodontitis in humans. Materials and Methods We searched through PubMed/Medline, Web of Science, and Scopus from inception to December 2020. Risk of bias was performed by using the Newcastle-Ottawa Scale for cross-sectional, cohort, and case-control studies. We performed the statistical analysis in Review Manager 5.3 (RevMan 5.3). Results 6 studies met the inclusion criteria for qualitative and quantitative synthesis. Statistical analysis of these studies suggests that there were no differences in the prevalence of post endodontic apical periodontitis (AP) when comparing non-smokers vs smoker subjects regarding patients (odds ratio [OR], 0.68; 95% confidence interval [CI], 0.31–1.49; I2 = 58%) and teeth (OR, 1.71; 95% CI, 0.99–2.93; I2 = 72%). Conclusions Our findings suggest that there was no association between cigarette smoking and post-endodontic apical periodontitis, as we did not find statistical differences in the prevalence of post-endodontic AP when comparing non-smokers vs smoker subjects. Therefore, smoking should not be considered a risk factor associated with endodontic failure.

ER유체의 내구성에 관한 실험적 고찰

박우철,안종국,정달도 三陟大學校 1998 論文集 Vol.31 No.1

This paper presents durability charateristics of electrorheological(ER) fluids which ungergo a reversible phase change depending upon the impositon of electric fields. The field--dependent Bingham properties are subjected to be altered from long time use of the ER fluid. A piston-rod system which has same mechanism as ER dampers is adopted in this study and tested by increesaing operation cycle up to 1 million. Bingham properties of initial and used ER fluids are tested and compared.

SPORTS 外傷에 關한 調査硏究 : Centering around 88 Olympic with representative player '88서울올림픽男子代表選手를 中心으로

盧日煥,姜忠植,金達永,金興植,朴贊弘,元忠熙,姜信一,金正洙,朴晶來,李哲遠,林鎬根 公州大學校스포츠科學硏究所 1988 스포츠科學硏究所論文集 Vol.- No.2

According to the investigation made by analyzing cause of the detail about sports injury. We make this things an object of all the male representative players 254 out of 286 (88.81%) that took part in the whole event from April 15, 1988 to September 16, 1988 in Seoul Olympic Games. The results are as follows. 1. The representative players in Korea started in the athlete life at age 13.1 on the average. Gymnast early started at age 8.4 and yachtist was later at age 18 in the athlete life. 2. There are about 5.7 cases on the outbreak of the sports trauma per person of player a year. This came into existence near the ankle at the high rate of damage formed 11.90%. 3. A sort of sports injury in analysis muscular bruise broke out at the highest rate of occurrence formed 15.70%. 4. The greater part of representative players themselves the injury of trauma by massage (12.53%). Some of them undergo medical treatment to the specialist hospital once a year on the average. Most of hockey players have had experience in this kind of injury treatment three times one year to per person of players. A few of them showed 0.15 times per person a year. 5. Most of representative players have been periodically to the orthopedist formed 27.59 (732) out of all 2653 cases at the high rate of fact. Especially a sort of injury in analysis, the injury of ankle region showed the percentage 11.86 (704) out of all 5,937 cases at the highest rate. 6. The period of medical treatment of the representative players in Korea came out about 14.7 days. Besides period of the other player's treatment came out mostly from one to five days formed 44.82%(935 cases) 7. Manyof them have been roughly treated with muscular bruise in analysis of sports injury. They were taking pains with muscular bruise formed 15.65% (1003) out of all 6408 case. 8. In major cause of sports injury came into existence during the training with waste of physical stamina formed 35.89% and were beyond their power with practicing the game formed 48.09%. Also, a sort of those were brought about the cause of sports injury with desire of outcome too much during in the game formed 44.20%