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RISS 인기검색어
- 검색키워드
- 저자 : Youngwook Park (검색결과 121 건)
- 무료
- 기관 내 무료
- 유료
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Cold Plasma Technique for Mandarin Storage at Room Temperature
( Youngwook Seo ),( Hoeman Park ),( Jong Ryul Park ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
This study is done to evaluate a dry sterilization method of microorganisms during storage of mandarin at room temperature. Dielectric barrier discharge (DBD) technology was used for plasma actuator. Mandarin (N=480) was divided by 2 groups for treatment (N=240) and control (N=240) group and stored for 5 weeks. Ten samples from each group were selected for each test such as physical changes (weight, color, hardness, and soluble solids content (SSC)) were observed. In addition, 30 samples in each group observed non-destructive properties as well as weight, color for 5 weeks. The specification of the DBD plasma actuator is as follows. The voltage is 150V, flow rate is 15L/min, actuator operation time is 15 seconds (ON), and break time is 15 minutes (OFF). Sterilized air was circularized by a diaphragm pump through a transparent Teflon pipe connected to the chamber and the actuator. Every 5 days, 1g of skin of the selected 10 samples was rinsed and then inoculated with potato dextrose agar (PDA) for 7 days in 25℃. Cell number was counted by applying image processing method (OpenCFU).
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Effect of cold plasma on inactivation of pathogens on citrus
Youngwook Seo,Hoeman Park,Jong Ryul Park 한국산업식품공학회 2018 학술대회 및 심포지엄 Vol.2018 No.04
This study is done to evaluate a dry sterilization method of plant pathogens on the citrus during storage. Cold plasma technique based on dielectric barrier discharge (DBD) technology was used for plasma actuating. Citrus was stored both cold (5℃, 90%RH) and ambient (18℃, 50%RH) store and analyzed for 3 weeks. Treatment (N=24) and control samples (N=48) were randomly divided for each group. The specification of the DBD plasma actuator is as follows: input voltage is 130 V, current is 0.3 A, flow rate is 15L/min, actuator operation time is 5 seconds (ON), and break time is 30 minutes (OFF). Concentration of ozone was 1.0~3.7 ppm and nitrogen dioxide was 0.5~2.5 ppm. Sterilized air was circularized by a diaphragm pump through a transparent Teflon pipe connected to the chamber and the actuator. Every 3~4 days, the selected samples were rinsed and then inoculated with potato dextrose agar (PDA) for 5 days. Cell number was counted by hemocytometer. Physical properties such as weight, color, soluble solid contents (SSC) and rigidity of peel were measured and compared during storage. Color and rigidity was measured four spots through equator of fruits.
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Development of Rice-paper Manufacturing Machine and Evaluation Rice-paper Physical Property
( Youngwook Seo ),( Jong-ryul Park ),( Hoeman Park ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.2
In order to resolve the redundant rice issue, development of rice processing machinery is an alternative solution. We developed the rice-paper manufacturing machine for performance test and finding optimal recipe rice-paper producing. Capacity of a machine is 30kg/h, input power is 220V, and consuming electric power is 3kW. The size of machine is 2774(L) × 500(W) × 1675(H) mm, and which consists of three parts as input, steam, delivery. Input part looks after half of cylinder which can manage of dropping quantity of mixed materials using a tap and knob. Mixed materials can be steamed moving through conveyer belt over steaming bin. Steaming bin can contain water of 10 liter, and water level sensor detects the water quantity so that the level of water is below than 3 liter, alarm rings then fill up the water to 10 liter. Steam bin has electric heating elements and its target temperature is 110°C. Conveying belt over the steam bin moves 1.5 rotates per second which is changeable speed depends on the condition of mixed materials. Thin and long rice paper moves on conveying belt then had cut using a plastic cutter. Processed rice paper moves to output part. Mixed materials with rice powder, starch powder and water has different physical properties. Rice powder 1,000g, tapioca starch 200g, and 60°C water 1,800 ㎖ can be produced rice paper quality. However, further study is necessary to find an optimal recipe using a few rice varieties and starches.
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Park, Youngwook,Lim, Jong Hyeon,Lee, Jin Yong,Kang, Heon American Chemical Society 2019 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.123 No.15
<P>The susceptibility of a water molecule to electric fields provides fundamental and essential information for understanding the vibrational spectra of water clusters and condensed-phase water. In this study, the Stark sensitivities for the ν<SUB>2</SUB> bending and ν<SUB>1</SUB> symmetric stretching vibrations of water molecule were experimentally determined. The water molecules isolated in the solid Ar matrix were spatially oriented in the direction of the externally applied field (∼10<SUP>8</SUP> V m<SUP>-1</SUP>) in the laboratory frame by using the ice-film nanocapacitor method. The signature of the field-induced reorientation of water molecules was observed with reflection-absorption infrared spectroscopy. The Stark sensitivities of the D<SUB>2</SUB>O vibrations were determined from the field-induced change of vibrational frequencies of the spatially oriented D<SUB>2</SUB>O molecules. The Stark sensitivity of the D<SUB>2</SUB>O bending vibration was much larger than that of the symmetric stretching vibration, and the two normal modes showed the opposite signs. Isotope dependence of the Stark sensitivity of the bending vibration was also observed by investigating HDO and H<SUB>2</SUB>O molecules. An ab initio calculation was conducted to elaborate on the observed characteristics of the Stark sensitivity of water vibrations.</P> [FIG OMISSION]</BR>
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Physical Properties of Commercial Rice Paper Sheet
( Youngwook Seo ),( Hoeman Park ),( Jong Ryul Park ),( Yeji Hwang ),( Yangwoo Shin ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
This is a preliminary study for developing a rice paper manufacturing machine. Consumption rate of rice paper (banh trang, a northern Vietnamese term) in Korea is rising. The ingredients of rice paper are simple as well non-glutinous rice, starch from tapioca and salt. In this study, physical properties of a few commercial rice paper sheets were measured using a universal testing machine. Physical properties such as weight, thickness, and hardness of a rice paper sheet were independent from the mixing ratio of the material, particularly, tapioca starch. A sample of rice composition as 90% showed sufficient tensile strength. Most commercial rice paper sheet was hard but thin as thick as 0.28 mm. Rice paper samples showed soft and tender physical properties after soaking in water.
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Evaluation of Nonthermal Plasma Treatment by Measurement of Stored Citrus Properties
( Youngwook Seo ),( Jong-ryul Park ),( Hoe Man Park ) 한국농업기계학회 2018 바이오시스템공학 Vol.43 No.4
Decay of fruit is one of the greatest issues in fruit storage. Purpose: In this study, citrus sterilization was performed to evaluate a dry sterilization method using an atmospheric-pressure nonthermal plasma treatment based on a dielectric-barrier discharge technique. Methods: Citrus samples were stored under four different environmental conditions as follows: group A had cold storage with plasma treatment with a temperature of 6.2 ± 1.0℃ and relative humidity (RH) of 93.4 ± 8.2%, group B had ambient-temperature storage with 22.9 ± 2.3℃ and 82.1 ± 4.5% RH, group C ambient-temperature storage with plasma treatment with 25.3 ± 2.2℃ and 90.0 ± 2.8% RH, and group D had cold storage with 5.7 ± 1.0℃ and 93.4 ± 6.5% RH. Results: As a result of citrus surface sterilization by plasma treatment, treatment groups A and C together showed an average of 16.1 CFU/mL of mold colonies, while control groups B and D showed an average of 2.2ⅹ10<sup>2</sup> CFU/mL or approximately 13 times greater than the treatment groups. Regarding the mean concentration of aerobic bacteria colonies, the treatment groups (A and C) and control groups (B and D) showed an average of 7.1 CFU/mL and 1.9ⅹ10<sup>3</sup> CFU/mL, respectively. This is approximately a 270-fold difference in the concentration of pathogen colonies between treatment and control groups. Conclusions: The results showed the potential of nonthermal plasma treatment for citrus storage in enhancing storage duration and quality preservation.
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박영욱(Park YoungWook),하규수(Ha KyuSoo) 한국산업정보학회 2018 한국산업정보학회논문지 Vol.23 No.5
본 연구의 목적은 첫째 대학의 평가제도, 교육지원, 인적자원등과 같은 내부지원 요인이 기술이전 사업화 활동에 종사하는 관계자들의 기술이전 사업화 의욕에 영향 요인 인지 밝히고자하였다. 둘째 이러한 내부 요인과 기술이전사업화 의욕의 인과관계에서 사회적 지지의 조절효과를 검증 하고자 하였다. 위 연구 내용을 분석 하기 위해 전국 40개 대학의 기술이전 사업화 조직에서 해당업무에 종사하는 산학교수, 직원을 대상으로 설문조사를 하였으며, 총160부를 배부하여 145부를 회수하였다. SPSS Statistics 22.0 을 이용하여 분석한 결과는 다음과 같다. 첫째, 대학 내부요인, 즉 업적평가, 교육지원, 인적자원 모두 기술이전사업화 의욕에 유의한 영향을 미쳤다. 둘째, 대학내부요인과 기술이전 사업화 의욕과의 관계에서 사회적 지지의 조절효과를 분석한 결과, 업적평가와 기술이전 사업화 의욕 관계에서 사회적 지지는 유사조절효과를 나타냈다. 하지만 교육지원 및 인적자원과 기술이전 사업화의욕 관계에서는 사회적 지지의 조절효과는 나타나지 않았다. 이 연구결과를 바탕으로 대학에서 기술이전 사업화 활동을 하는 사람중심의 지원정책수립에 시사점을 제공 하고자 한다. The first purpose of this study is to find out whether internal support factors such as evaluation system, education support program, and human resources of universities are factors that influencing the motivation of technology transfer and commercialization among those engaged in technology transfer and commercialization activities. Second, verified the regulation effect of social support from the cause-and-effect relationship between motivation of technology transfer commercialization and the said internal factors. In order to analyze the above research, a questionnaire survey was conducted for the professors and employees engaged in the technology transfer and commercialization organization of 40 universities in Korea. A total of 160 surveys were distributed, of which 145 were collected. The results of analysis using SPSS Statistics 22.0 are as follows. First, all internal factors of university such as evaluation system, education support program, and human resources have significant influence on the motivation for technology transfer and commercialization. Second, as a result of analyzing the regulation effect of the social support in relation to the internal factor of the university and the motivation of technology transfer and commercialization, the quasi regulation effect can be founded in between evaluation system and motivation of technology transfer and commercialization. However, there is no regulation effect of social support between the education support program, human resources and motivation for technology transfer and commercialization. Based on the results of this study, suggestions can be founded for establishing a support policy for those who are engaged in technology transfer and commercialization in universities.
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