• Journal of the Korean Society of Food Culture
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• v.2 no.2
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• pp.163-167
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• 1987

To determine and improve the holding machinery for the productin of convenient food (Dosirak) making Compnay in Seoul and Kyeongkido, a survey was conducted of 16 relative companys in 1986. The majority of the holding machinery are composed to work table, sink, rice cooker and fryer. It is necessary that the machinery are reinforced like packaging machine, air cleaner, cold and refrigeration room, sanitary arrangements.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2011.06a
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• pp.281-281
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• 2011

• 한국생물공학회:학술대회논문집
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• 2001.11a
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• pp.564-567
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• 2001

Optimal bactericidal conditions of pilot scale UV-$TiO_2$ photoreractor were studied. As the inner diameter of reactor increased. the bactedcidal efficiency decreased. Similarly bactedcidal effect was elevated according to the higher concentration of $TiO_2$. however. the effect was not repressed by the highest concentration(6.000 $mg/{\ell}$)of $TiO_2$ Bactericidal effect of muscovite bead was higher than that of glass bead. When bacterial cells were applied to the photoreacter for 1. 5. and 15 min, bactericidal effects were 62, 94.3. and 99.8%, respectively. When 30 $mg/{\ell}$ of $H_2O_2$ was added to the reaction mixture and sterilized for 5 min, the bactericidal efficiency was 99.8%.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.05a
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• pp.352-353
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• 2001

오존(O$_3$)은 강력한 산화력 및 극히 짧은 반감기, 잔류오존의 순간적 산소로 전환 등의 성질이 있어 수중 유기물질의 산화분해, 탈색 및 탈취, 소독을 위해 수(水)처리 분야에서 많이 이용되고 있고, 자외선은 대상물질의 pH, 색상 맛, 냄새, 온도 등을 변화시키지 않고 세균을 죽일 수 있는 살균제로 오래 전부터 식품 및 의학분야에서 널리 응용되어 오고 있다. (중략)

• Korean Journal of Environmental Agriculture
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• v.27 no.4
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• pp.435-440
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• 2008

Bovine mastitis is an important disease causing serious economic loss in dairy production and food poison in public health. The major causative agents of bovine mastitis include Escherichia coli (E. coli), Streptococcus agalactiae (S. agalactiae), Staphylococcus aureus (S. aureus). These bacteria were found in milk and environmental condition such as feces, water, soil and so on. Recently, many cases of mastitis are derived from environmental contamination of micro-organisms, which important factors for the spread of this disease in farm. Ultraviolet irradiation (UV) has been used as disinfection for waste and water in clinical and industrial facilities. Moreover the UV irradiation has been used as useful bactericidal agents to remove bacterial biofilms in environmental condition. In this study, we determined the bacterial replication in different percentage of water content (PWC) in sterilized saw dust and feces complexes from farm, and results showed that slightly decreased growth pattern of E. coli and S. agalactiae but increased growth pattern of S. aureus in various PWC (200, 400 and 600%) until 144 h incubation. In the bacteriocidal effect of UV irradiation to bacteria in saw dust and feces complex, the results showed that bacteriocidal effect was depended on the UV irradiation time, irradiation distance and PWC. Especially the antibacterial activity of UV irratiation is stronger in low PWC (50%), long time irradiation (50 sec), and short distance (5 cm) than other condition of this study. Furthermore UV irradiation with stirring showed increased the bactericidal effect compared without stirring. These results suggested that bovine mastitis causing agents may survive long time in environmental condition especially saw dust and feces complexes in farm and can cause a various disease including mastitis. Moreover, these data can be used as basis for application and development of UV disinfection to control of bovine mastitis from environmental contaminated bacteria in dairy farm.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.7
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• pp.367-373
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• 2016

This study was performed to set a limitation rule to the UV sterilization process for green vegetable juice containing barley sprouts. The main constituents of the green vegetable juice, viz. barley sprouts, organic Angelica keiskei, carrots, organic dandelion, kale, wild parsley, Angelica keiskei and cabbage, were provided by the CSJ company located in Jincheon, Chungbuk, from December 1st, 2015 to March 1st, 2016. Our manufacturing process followed the general manufacturing process of a general green vegetable juice manufacturer. Table 1 shows the mixing ratio for the green vegetable juice. This green vegetable juice includes 18% vegetable sprouts, 3% barley sprouts, 18% angelica utilis makino, 1% orange concentrate, 4% apple concentrate, 6% fructooligosaccharide, 10% vegetable fermentation juice, 0.4% lemon concentrate and 39.6% purified water. We conducted UV sterilization at levels 10, 8 and 5 with powers of 230W, 320W and 320W, respectively. The UV sterilization was conducted twice at 25Hz and then once at 40Hz. In the bacterial tests after sterilization, the number of bacteria in the dandelions decreased from $2.56{\times}10^8CFU/mL$ to $5.96{\times}10^3CFU/mL$. In addition, no food poisoning or coliform bacteria were detected. Thus, this study provides the information required for setting a limitation rule using bacteria tests in the UV sterilization process for green vegetable juice.

• Journal of Advanced Marine Engineering and Technology
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• v.35 no.5
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• pp.675-681
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• 2011

In this paper, we dealt with the design and fabrication of a medium pressure ultra-violet (UV) lamp and a magnetic ballast which are main components for ballast water treatment systems (BWTS). To acquire an optimal discharge condition of UV lamp, electrical and optical characteristics depending on the argon gas volume and the amount of mercury were experimentally analyzed. Rated voltage, current and power consumption of a prototype lamp were 490 [V], 8.6 [A] and 4.0 [kW], respectively. UV intensity of the lamp was 15 [%] higher than that of an equivalent lamp which is used in a BWTS. The magnetic ballast was designed in a UI core type through theoretical analysis and simulation. The open voltage and the rated power consumption of the ballast were 920 [V] and 8.5 [kVA] respectively. The disinfection efficacy which is carried out in a BWTS equipped with the UV lamp and magnetic ballast was over 99.99 [%], and this satisfy the IMO regulations.

• Journal of the Korea Society of Computer and Information
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• v.29 no.7
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• pp.21-32
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• 2024

Since leather shoes cannot be washed with water, there is a need for a cleaning method that can remove extraneous substance from the inside and outside of shoes and senitize the inside of shoes without using water. For this purpose, this paper develops a shoes cleaning machine control system that automatically controls the entire process of shoes cleaning in a shoes cleaning machine that quickly cleans the inside and outside of shoes using compressed air, sterilization solution. The developed system uses Rasberry Pi, a general purpose single board computer(SBC), to control various actuators of the shoes cleaning machine. The shoes cleaning machine operated by the developed system shows a sterilization efficiency of more than 99% and an odor removal efficiency of more than 86% in a cleaning time of less than 1 minute.

• Korean Journal of Food Science and Technology
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• v.25 no.2
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• pp.174-177
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• 1993

Ultara violet ray air cleaner to use as the sterilization and deodorization device in refrigerator was designed and made of UV lamp and carbon block as the main components. The intensity of the lamp was $2.38\;mW/cm^2$ and reflector was installed to increase the radation. After running the device for 12 hours, 80% of the population of airborn bacteria was sterilized both at 48 and 480 liter refrigerator chambers. Ozone production caused by UV-ray reached 0.082 ppm at holding section within a few second when the device was operated at $25^{\circ}C$ and it showed 0.06 pm at $3^{\circ}C$. Deodorization effect was 2.5 times greater than that of a device made of electrical are principle at $25^{\circ}C$. New device 2 times more effectivly decreased trimethylamine and methyl mercaptan content applied as odor indicator substance in chamber at $3^{\circ}C$ than electrical arc type.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.22 no.6
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• pp.353-360
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• 2010

Recently H1N1(swine flu) and SARS has been infected widely in the world; we have to care about germs and virus in indoor air environment. The air sterilization system investigated in this study allows occupants to turn on/off and to control the incoming air speed and direction. To predict the performance of air sterilization system without real experiment, a simulation is considered to compare and analyze the performance of the air sterilization systems in a typical office space. Multiple system parameters including volume flow rate and velocity of supply air were varied and investigated during the simulation. The investigation result shows that difference (between simulation and experiment) was about 3.5% in case of minimum air flow rate and about 0.2% in case of maximum air flow rate. The results indicate that multi-zone simulation technique can be used to predict the performance of a sterilization system in personalized office.