• 대한디지털의료영상학회논문지
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• 제15권2호
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• pp.69-76
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• 2013

We checked the existence of bacteria at DR equipment, radiation generator and cassette in 'D university' to propose optimized management method for bacteria and disinfection at DR equipment, radiation generator and cassette at used in radiographic laboratory of the department of radiology. The infected region is treated by alcohol and cresol and compared before spraying and after spraying for 1, 3, 5 and 10 minutes. As time goes on, amount of bacteria colony decreases significantly. The Cresol is useful to disinfect the diminutive devices. However alcohol disinfection, at least 5 minutes later, and hand washing before practical training and shooting image is recommended due to the big and fixed radiography equipment which cause the soakage.

• 한국어병학회지
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• 제37권1호
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• pp.139-145
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• 2024

In this study, nylon mash and silicone tube mainly used as shrimp farm equipment were contaminated with Enterocytozoon hepatopenaei (EHP) which is the cause of Hepatopancreatic microsporidiosis (HPM), and were treated with calcium hypochlorite or UV-C disinfection methods for EHP eradication. As a result, similar with the control group (not disinfected), EHP was detected on the nested PCR until the 10 days in the UV-C single treated group. On the other hand, EHP was not detected from 7 days in calcium hypochlorite single treated group (total concentration 200 ppm as available chlorine), and combination of calcium hypochlorite and UV-C treated group revealed no detection of EHP from 3 days. It is appropriate that treated with UV-C and calcium hypochlorite for 3 days or single treated with calcium hypochlorite for 7 days to eradicate EHP on contaminated instrument used in shrimp farms. In contrast, disinfection effect of only using UV-C is very low.

• 한국치위생학회지
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• 제9권2호
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• pp.73-88
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• 2009

The purpose of the study was to provide the basic for the prevention of infection control by analyzing the level of recognition and practice of dental hygiene students. It is important for dental clinic staffs to know and practice infection control measures in favor of effective infection control. Thus, this study conducted an one-month questionnaire survey (during October 2008) for dental hygiene students who ever experienced in 16-week clinical practice, and analyzed total 206 questionnaire forms as collected from them, so that it could determine potential associations between their recognition and practice of infection control and thereby suggest an efficient solution for infection control in dental hygiene. 1. It was found that our students' recognition about infection control averaged $4.49{\pm}.58$ points on the whole, and they were best aware of instrumental disinfection and sterilization among other measures, which was followed by hand washing, extirpation control, post-sterilization management, personal protective outfit and instrumental surface maintenance respectively. 2. It was found that our students' practice of infection control averaged $3.85{\pm}.57$ points on the whole, and they practiced hand washing most actively among other measures, which was followed by extirpation control, post-sterilization management, instrumental disinfection and sterilization, personal protective outfit and instrumental surface maintenance respectively. 3. It was found that our students scored higher mean points in recognition about every measure of infection control than those in practice (t=15.676, p=0.000). Particularly, it was notable that there were significant differences between their mean points in recognition and practice of some infection control measures, such as instrumental surface maintenance (t=15.361, p=0.000), personal protective outfit (t=15.245, p=0.000) and instrumental disinfection and sterilization (t=11.169, p=0.000). But there was least significant difference between mean points in recognition and practice of hand washing (t=5.460, p=0.000). 4. For potential associations between recognition and practice of infection control, it was found that higher recognition was in significantly positive associations with higher practice in every measure of infection control (r=.478, p=.000), such as extirpation control (r=.630, p=.000), instrumental disinfection and sterilization (r=.477, p=.000) and post-sterilization management (r=.433, p=.000). 5. It was found that there were differences in our students' recognition depending upon availability of infection control guideline (t=4.587, p=.011), and there were significant differences in practice depending on necessity of infection control education on a statistical basis (t=2.229, p=.027). Overall, it is found that our dental hygiene students are very likely to practice hand washing and extirpation control, because both of these measures are relatively easy to practice or are considered legally binding.

• Journal of Korean Biological Nursing Science
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• 제15권2호
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• pp.90-98
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• 2013

Purpose: The purpose of this study was to develop a clinical practice nursing students' microbiology program based on the mastery learning model, and to evaluate the effects of the program on nursing students' knowledge, self-efficacy, performance, and satisfaction related to the nursing students' microbiology program. Methods: The program was developed by using the processes of the mastery learning model. The pre-experimental research design involved a one group pretest-posttest design. The setting was a university located in Incheon, Korea. A total of 130 nursing students participated in the program including a theoretical lecture, clinical practice, and formative and summative evaluation. Results: Using the program that was designed and developed, results for the total score of self-efficacy, knowledge, and performance in the post-test application were significantly higher than in the pre-test application (p<.05). The satisfaction of hand hygiene and disinfection/contaminated hand microbial culture and disinfection test received the highest ratings. Conclusion: The application of a clinical practice nursing students' microbiology program was effective, and can be expanded to other nursing students. Future research with other study designs was warranted in order to prove the effect of a microbiology program based on the mastery learning model.

• 상하수도학회지
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• 제19권3호
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• pp.301-311
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• 2005

The characteristics of disinfection by-products (DBPs) formation at 28 water treatment plants in Korea were investigated. Investigated species of DBPs were trihalomethanes (THMs), haloacetic acids (HAAs) and chloral hydrate (CH). The maximum concentration of THMs was $84.1{\mu}g/L$, minimum and the averages were $6.9{\mu}g/L$ and $27.8{\mu}g/L$, respectively; the maximum concentration of $HAA_5$ was $90.8{\mu}g/L$, minimum and the averages were $3.8{\mu}g/L$ and $26.7{\mu}g/L$, respectively; while the maximum concentration of CH was $29.5{\mu}g/L$, minimum and the averages were $0.5{\mu}g/L$ and $7.4{\mu}g/L$, respectively. On the other hand, DBPs levels during summer months, when the water temperature was near $25^{\circ}C$, were nearly twice as great as DBPs levels during the winter season. The ratio of $THMs/HAA_5$ was 1.07, and $HAA_5$ and THMs were the dominant species of DBPS in the Kum-Sumjin river and Nakdong river, respectivley.

• International Journal of Computer Science & Network Security
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• 제22권1호
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• pp.175-182
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• 2022

This work presents a simulation model for a specific UV disinfection system (UVDS) powered by a Photovoltaic System. The global UVDS also includes the electronic converters, Electronic Ballast, UV Lamp and Motor Pump. The equations that model the physical components' behaviour are connected to obtain a dynamic global model. The latter is converted in a Simulink/Matlab model, which allows to carry out simulation series concerning the entire UVDS. The physical parameters: the irradiation G and the temperature T, are considered as inputs. series of measurements carried out in order to show how these parameters affect the current, the voltage of the PVs and especially the value of the current of the UV lamp, on the other hand a study on the behavior and the evolution of the parameters of the motor pump such as the armature current, motor torque, speed of rotation and the water flow. The purpose of all this is to realize how important are the two parameters concerning the lamp current and the water flow because they are two very important factors to keep an adequate water quality.

• 대한환경공학회지
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• 제28권11호
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• pp.1135-1140
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• 2006

국내 정수장에서 염소소독시 발생하는 소독부산물인 트리할로메탄(THMs), 할로아세틱에시드(HAAs)의 발생농도와 각각의 종별 분포현황을 조사하였다. 조사대상은 일반적인 정수처리공정으로 구성된 한강, 금강, 섬진강, 낙동강 수계의 1개 정수장씩 총 4개소였다. THMs의 발생농도는 평균 26.9 ppb, 최대 46.7 ppb, 최소 11.0 ppb였으며, $HAA_5$의 발생농도는 평균 25.4 ppb, 최대 57.1 ppb, 최소 9.7 ppb였다. 계절적으로는 동절기에 농도가 낮았고 하절기에 높았다. THMs의 종별 분포를 조사한 결과 클로로포름의 비율이 평균 77%로 가장 높았고 다음으로는 브로모디클로로메탄(20%)이 높게 검출되었으며, 브로모포름의 농도는 정량한계 미만이었다. $HAA_5$의 경우 디클로로아세틱에시드(DCAA)와 트리클로로아세틱에시드(TCAA)의 합이 $HAA_5$의 97%를 차지하는 것으로 조사되었다. 그러나 한강수계의 경우는 이 비율이 평균 90%로 다소 낮았으며, 특히 겨울철에 비율이 가장 낮았다. 한편, 하절기를 제외하고는 DCAA가 TCAA보다 높은 것으로 조사되었다.

• 한국기록관리학회지
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• 제16권2호
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• pp.173-183
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• 2016

수장고 및 서고에서 곰팡이는 문화재와 기록물의 생물학적 열화를 일으키는 주요 원인이다. 또한, 독소를 생성하고 피부알레르기를 유발하여 유물과 기록물 및 도서를 다루는 근무자의 호흡기질환과 피부질환 등을 일으키기도 한다. 특히 근무자의 피부 및 손에 접촉되어 2차 감염을 일으킬 수 있다. 이를 예방하기 위하여 시중에서 쉽게 구입할 수 있는 손소독제는 일반세균에 대하여 소독효과를 보이지만, 곰팡이에는 소독효과가 떨어져 이에 대한 대체 연구가 필요한 실정이다. 본 연구에서는 손소독제 조성물로 친환경적인 Geranial, Cineol, Menthol과 편백(Chamaecyparis obtusa)의 유효성분으로 하는 손소독제를 연구 개발하여 박물관 및 기록관의 서고에서 조사된 곰팡이 10종(Alternaria citrimacularis, Alternaria consortialis, Aspergillus niger, Aspergillus versicolor, Cladosporium sphaerospermum, Coniothyrium aleuritis, Penicillium brevicompactum, Penicillium corylophilum, Penicillium paneum, Penicillium polonicum)에 대하여 소독효과를 시험한 결과, 우수한 소독효과를 나타내는 것을 확인하였다. 이에 Geranial, Cineol, Menthol과 편백의 유효성분을 조성물로 하는 손소독제의 개발로 문화재와 기록물 및 도서를 다루는 근무자의 피부질환과 2차 감염을 예방할 수 있을 것으로 기대한다.

• Ecology and Resilient Infrastructure
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• 제5권3호
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• pp.111-117
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• 2018

선박평형수 처리에의 적용을 목적으로 다양한 미생물 농도, 소독제 주입량, pH 조건에서 이산화염소의 소독 효과를 조사하였다. 살균 반응 속도 및 소독 부산물 생성 여부는 선박평형수 처리에 일반적으로 사용되는 소독제인 염소와 비교 평가하였다. 선박평형수 배출 규제 항목인 E. coli 와 Enterococcus의 이산화염소에 의한 사멸 효과는 유사 2차 반응으로 모사하였다. 선박평형수 처리를 위한 최적 이산화염소 투입 농도는 1 mg/L으로 나타났다. pH 7.2 - 9.2 범위에서 이산화염소의 살균 반응 속도 상수의 변화폭이 5% 이내였던데 비해 같은 유효염소 농도에서의 염소의 살균 반응 속도 상수는 E. coli 기준 17%, Enterococcus 기준 25% 감소하여 약 염기성인 선박평형수의 소독에 이산화염소가 염소에 비해 효과적임을 확인하였다. 또한 생태계를 교란할 수 있는 소독 부산물 생성에 있어서도 염소에 비해 현격히 낮은 결과를 보였다. 소독 후 장기 보관 시 30일까지는 지표 세균 및 플랑크톤의 재증식은 발견되지 않았다. 이산화염소는 선박평형수에 적합한 소독제로 판단된다.

• 식물병연구
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• 제26권2호
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• pp.72-78
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• 2020

클로버씨스트선충은 국내 고랭지배추 재배지에서 가장 문제되고 있는 식물기생선충 중 하나이다. 본 연구는 새로 개발한 훈증성 약제 처리기의 성능을 시험하기 위하여 고랭지배추 문제 클로버씨스트선충을 대상으로 훈증성 약제 2종(dimethyl disulfide [DMDS], metam sodium [MNa])의 살선충 활성을 검정하였다. 훈증성 약제의 방제 효과는 약제 처리 4주 후 처리구별 토양으로부터 씨스트를 채집하여 클로버씨스트선충 알 부화율을 조사하였고, 씨스트 내부의 알을 배추에 접종하여 얻은 암컷 증식 수를 조사하여 평가했다. DMDS (39 l/10 a)는 클로버씨스트선충 알 부화율과 암컷 증식 수를 각각 99.0% 이상 억제하였으나, MNa (29 l/10 a)는 알 부화율은 78.3-99.4%, 암컷 증식 수는 34.7-49.3% 정도 억제하였다. 훈증성 약제 2종의 처리 깊이에 따른 클로버씨스트선충 알 부화율과 암컷 증식수는 통계적으로 유의미한 차이를 보이지 않았다. 본 연구에서 개발된 토양 소독기를 이용하여 DMDS를 토양 처리하면 클로버씨스트선충 방제 효과가 있을 것으로 보인다.