플라즈마 발파를 이용한 유류오염토양의 원위치 정화 효율 개선

백인준,장현식,송재용,이근춘,장보안 대한지질공학회 2021 대한지질공학회 학술발표회논문집 Vol.2021 No.2

플라즈마 발파를 이용한 토양 내 유체의 침투 효율 개선

백인준 ( In-joon Baek ),장현식 ( Hyun-shic Jang ),송재용 ( Jae-yong Song ),이근춘 ( Geun-chun Lee ),장보안 ( Bo-an Jang ) 대한지질공학회 2021 지질공학 Vol.31 No.3

고전압 아크 방전에 의한 플라즈마 발파의 유체 침투 효율을 검증하기 위해 실험실 규모의 토사 시료에 대하여 발파 시험을 실시하였다. 이 연구를 위해 대용량 축전기가 포함된 플라즈마 발파 장치와 직경 80 cm, 높이 60 cm 크기의 컬럼형 토사 시료를 제작하였다. 토사 시료로는 사질토와 실트를 7:3 비율로 섞은 A 시료 7개와 9:1 비율로 섞은 B 시료 3개가 제작되었다. A 시료에 플라즈마 발파 없이 수압만으로 유체를 주입했을 때는 시추공 주변으로 국소적인 침투만 발생되었고 침투면적비는 5% 이하로 분석되었다. 플라즈마 발파에 의한 유체 침투 시험은 1 kJ, 4 kJ 그리고 9 kJ의 방전 에너지로 실시되었다. A 시료에 대한 플라즈마 발파 시험에서 유체의 침투면적비는 1회만 발파하였을 때는 16~25% 이고 5회 연속 발파 시에는 30~48%로 분석되어, 수압만으로 유체를 주입했을 때보다 침투면적이 최대 9.6배까지 넓어졌다. B 시료에 대한 5회 연속 플라즈마 발파 시험에서 유체의 침투면적비는 33~59%로 분석되어 동일 조건의 A 시료 시험에 비해 침투면적이 1.1~1.4배 정도 넓어졌다. 이러한 결과는 플라즈마 발파 시에 방전 에너지가 클수록, 발파 횟수가 증가할 수록 유체의 침투면적이 증가하며, 투수성이 큰 토양에서 플라즈마 발파가 더욱 효과적임을 보여준다. 유체 침투 효과를 삼차원적인 부피로 분석하기 위해 유체 침투반경을 계산하였다. 수압으로만 유체를 주입했을 때의 침투반경은 9 cm인 반면에, 9 kJ의 에너지로 5회 발파 시에는 침투반경이 27~30 cm로 계산되어 유체 침투 효과가 최대 333%까지 증가되었다. 이러한 연구결과는 투수성이 낮은 실제 오염토양에서 원위치 토양 세정을 실시할 때 플라즈마 발파 기술을 적용하면, 세정제의 전달범위가 증가되어 정화효율이 개선될 수 있다는 것을 보여준다. Plasma blasting by high voltage arc discharge were performed in laboratory-scale soil samples to investigate the fluid penetration efficiency. A plasma blasting device with a large-capacity capacitor and columnar soil samples with a diameter of 80 cm and a height of 60 cm were prepared. Columnar soil samples consist of seven A-samples mixed with sand and silt by ratio of 7:3 and three B-samples by ratio of 9:1. When fluid was injected into A-sample by pressure without plasma blasting, fluid penetrated into soil only near around the borehole, and penetration area ratio was less than 5%. Fluid was injected by plasma blasting with three different discharge energies of 1 kJ, 4 kJ and 9 kJ. When plasma blasting was performed once in the A-samples, penetration area ratios of the fluid were 16-25%. Penetration area ratios were 30-48% when blastings were executed five times consecutively. The largest penetration area by plasma blasting was 9.6 times larger than that by fluid injection by pressure. This indicates that the higher discharge energy of plasma blasting and the more numbers of blasting are, the larger are fluid penetration areas. When five consecutive plasma blasting were carried out in B-sample, fluid penetration area ratios were 33-59%. Penetration areas into B-samples were 1.1-1.4 times larger than those in A-samples when test conditions were the same, indicating that the higher permeability of soil is, the larger is fluid penetration area. The fluid penetration radius was calculated to figure out fluid penetration volume. When the fluid was injected by pressure, the penetration radius was 9 cm. Whereas, the penetration radius was 27-30 cm when blasting were performed 5 times with energy of 9 kJ. The radius increased up to 333% by plasma blasting. All these results indicate that cleaning agent penetrates further and remediation efficiency of contaminated soil will be improved if plasma blasting technology is applied to in situ cleaning of contaminated soil with low permeability.

초음파 센서의 혼 가이드 각동에 따른 음향 지향 특성

백인준(In Joon Baek),임성구(Sung Gu Lim),김진오(Jin Oh Kim),채민구(Min Ku Chae),유갑상(Gap Sang Yoo) 한국소음진동공학회 2018 한국소음진동공학회 학술대회논문집 Vol.2018 No.4

후두에서 발생한 거대세포종양

백소야,진윤미,양우익,최인준,김영호 대한병리학회 1997 Journal of Pathology and Translational Medicine Vol.31 No.1

Improvement of fluid penetration in soil by plasma blasting

장현식,백인준,송재용,이근춘,장보안 한국지질과학협의회 2022 Geosciences Journal Vol.26 No.6

Plasma blasting by high-voltage arc discharge was performed in laboratory-scale soil samples to investigate fluid penetration. A plasma blasting device with a large-capacity capacitor and columnar soil samples with a diameter of 80 cm and a height of 60 cm were prepared. The columnar soil samples were made of sand and silt mixed in a 7:3 ratio (the A samples) or a 9:1 ratio (the B samples). When fluid was injected by pressure without plasma blasting, fluid penetrated into the soil only near the borehole, and the penetration area ratio was less than 10%. In further tests, fluid was injected by plasma blasting with different discharge energies of 1–27 kJ. When plasma blasting was performed once in the A samples, the penetration area ratios of the fluid were 16–25%; after five consecutive blasts, the penetration area ratios were 30–48%. When five consecutive plasma blasts were carried out on the B samples, the fluid penetration area ratios were 33–72%. This difference indicates that the fluid penetration area increases with higher discharge energy of plasma blasting and with a greater number of blasts. The fluid penetration radius was calculated to assess the fluid penetration volume. When the fluid was injected by hydraulic pressure only, the penetration radius was 9–12.4 cm, whereas the penetration radius was 27–33.2 cm when blasting was performed five times. The radius was increased by up to 200% by plasma blasting. In the field tests, the fluid injection in the test hole subjected to plasma blasting was greater by about 170% compared with the control test hole, in which the fluid was injected only by hydraulic pressure. In addition, the electrical resistivity around the test hole subjected to plasma blasting was markedly lower, and fluid diffused from this test hole to a minimum radius of 2 m. These results indicate that a cleaning agent will penetrate further and the remediation efficiency of contaminated soil will be improved if plasma blasting is applied for in situ cleaning of low-permeability contaminated soil.

건고추 생산단계 중 고추의 곰팡이 발생

김소수,백슬기,황인준,김세리,정규석,노은정,장자영,김점순,이데레사 한국식품위생안전성학회 2019 한국식품위생안전성학회지 Vol.34 No.6

Fungal occurrence during production of dried red pepper was investigated using red pepper samples collected at harvest, before and after washing, and before, during or after drying. Fungal incidence was evaluated by counting the number of fungal colonies grown after incubating random pepper cuts on potato dextrose agar plates. Washing with ground water had no significant effect on reduction of fungal contamination. Fungal increase was observed in some samples, and the insides of washer and containers were contaminated with fungi. Drying caused significant fungal increase regardless of drying method although the fungal incidence after machine drying was lower than that after greenhouse drying. Fungal increase was observed in the samples being dried in a greenhouse and some mycotoxigenic species were also detected. Therefore, the most important control point for fungal contamination during dried pepper production appears to be the drying process, especially in a greenhouse.

유류오염토양의 정화효율 개선을 위한 플라즈마 블라스팅 기술의 적용 가능성 연구

장현식,김기준,송재용,백인준,김아현,장보안 대한지질공학회 2021 대한지질공학회 학술발표회논문집 Vol.2021 No.1

초음파 센서의 혼 가이드 형상에 따른 음향 지향성

임성구(Sung Gu Lim),백인준(In Joon Beak),김진오(Jin Oh Kim),채민구(Min Ku Chae),유갑상(Gap Snag Yoo) 한국소음진동공학회 2018 한국소음진동공학회 학술대회논문집 Vol.2018 No.4

비디오테이프 KR이 테니스 첫 서비스 수행과 자기효능감에 미치는 영향

박기용,박영명,박병규,백인준 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.2

The purpose of this study was to examine the effect of Video Tape KR on First Serve Performance and self-efficacy. The 16 subjects were intentionally assigned to 2 different conditions groups : 8 involved in Video Tape KR A group(experimental group 1), and 8 involved in control group. Each experimental group participated in Video Tape KR A group and B group for 5 weeks. The experimental task was First Serve Performance. The experimental instruments were Video Tape KR A, and self-efficacy questionnaires. The Video Tape KR suitable for tennis was comprised of general instructions, t-test was conducted to test the data. The conclusions are as followings: 1. The Video Tape KR has an affirmative influence upon First Serve performance. 2. The Video Tape KR has an influence upon self-efficacy. 3. The Video Tape KR has an influence upon First Serve performance and self-efficacy.

서해안 3배체 굴 (Crassostrea gigas) 의 계절별 체성분, 아미노산, 지방산 및 글리코겐 함량 변화

황인준,한종철,허영백,임현정 한국패류학회 2016 The Korean Journal of Malacology Vol.32 No.4

We examined the seasonal variation of the proximate, amino acid, fatty acid composition and glycogen contents of triploid Pacific oyster cultured in western coastal waters of Korea in 2015. The specimens were collected in February, May, August and November from off-bottom farming site. The lipid content was the highest in winter season (February, 2.10 ± 0.06 %), the protein content was the highest in autumn season (November, 9.09 ± 0.04%) while the moisture and ash content was the highest in summer season (August, 86.00 ± 0.12% and 2.67 ± 0.03%, respectively). The total amino acid contents was the highest in winter season (1,011.5 mg / 100 g), decreased gradually and was the lowest in summer season (486.7 mg / 100 g). The total amino acid composition was dominated by taurine, aspartic acid, glutamic acid, glycine and alanine. In the fatty acid composition, the two fatty acids, eicosapentaenoic acid and docosahexaenoic acid, which comprised that as much as 50% of the total fatty acid contents, were dominated during all season. The glycogen content was the highest in summer season (1.26 ± 0.03 g / 100 g) although it was stable during the other season with the range of 0.69 ± 0.04-0.86 ± 0.01 g / 100 g. Taken together, these results suggest that triploid pacific oysters have high commercial value not only in winter season but in summer season because they do not spawn and have high contents of glycogen comparing with those of diploid oyster in this period.