• 한국어업기술학회:학술대회논문집
• /
• 한국어업기술학회 2001년도 추계 수산관련학회 공동학술대회발표요지집
• /
• pp.141-142
• /
• 2001

Liquid smoke is made by concentration of smoke generated from charcoal of broad-leaved trees, or by refinement of smoke originated from incomplete combustion of wood condensate (Park et al., 1994). Generally, it is well known that phenol and its derivatives have antioxidative effect, while acids and formaldehyde have antimicrobial effect (Park et al., 1994). Meanwhile, some studies (Alonge, 1988; Dungel, 1961) reported that the high incidence of stomach cancer has been associated with the consumption of smoked fishes, and these were investigated to direct intake of fishes treated with smoke, containing polycyclic aromatic hydrocarbons(PAHs)(Moret et al., 1999). (omitted)

• 한국농공학회논문집
• /
• 제50권4호
• /
• pp.89-97
• /
• 2008

A downdraft gasifier was manufactured for biomass gasification. The gasifier was designed based on the principles of gasification presented in previous studies. The pipes of 25mm diameter were used for both supplying air and discharging producer gas. Wood charcoals were mostly used for fuels. The concentration of CO ranged from 25 to 35%, comparable to the values presented in other studies. The temperature outside wall of the gasifier was measured up to $400^{\circ}C$, indicating a great heat loss. When glass wool was cover over the wall, some parts of wire mesh located in the bottom of the reactor were molten down. There were several modifications that should be made in order to improve its efficiency and obtain more stable continuous gasification, including insulation, reduction in pressure loss, durable bottom meshes, the optimum length of reaction part, and safety.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2019년도 추계 학술논문 발표대회
• /
• pp.160-161
• /
• 2019

Recently, a bed company's product has detected a certain level of radon or higher, making it a popular search word on portal sites. Because of this problem, people are becoming more interested in radon. The government plans to support the establishment of a radon alert system for households through a radon concentration survey of 10,000 households. The use of palm charcoal as an indoor finishing material will reduce the risk of lung cancer through radon reduction. The experiment used a method of replacing palm activated carbon with blast furnace slag, and the adsorption performance of radon tends to increase as the replacement rate of palm activated carbon increases.

• 한국식품위생안전성학회지
• /
• 제13권1호
• /
• pp.14-19
• /
• 1998

수산용 항균제로 널리 사용되고 있는 옥소린산의 잔류량을 전북지역에서 기판중인 뱀장어 근육조직에서 측정하였다. 후배부 근육중의 옥소린산 잔류량은 시료에 따라 많은 차이가 있었으며 32%의 시료에서는 검출되지 않았다. 옥소린산이 검출된 시료중 16%에서는 그 농도가 0.1ppm이상이었다. 중요 장기중의 옥소린산 농도는 신장>간장> 혈장>근육의 순이었다. 근육중의 옥소린산은 10분 가열에 의해 거의 감소가 되지 않았으며 30분 가열에 의해서는 원래 농도의 50% 수준으로 감소하였으나 30분 가열후의 시료는 김하게 탄화되었다. 고용량의 옥소린산을 실험실적으로 뱀장어에 투여하여 얻은 근육중의 농도나 수용액중의 옥소린산이 가열에 의해 파괴되는 경향을 검토함으로써 뱀방어에 투여하여 얻은 근육중의 농도나 수용액중의 옥소린산이 가열에 의해 파괴되는 경향을 검토함으로써 옥소린산의 열안정성이 확인되었다. 이 연구 결과는 뱀장어 소비자를 옥소린산 섭취로부터 보호할 수 있는 규제의 강화가 필요함을 시사하였다.

• Journal of Plant Biotechnology
• /
• 제44권4호
• /
• pp.448-453
• /
• 2017

본 연구는 꿩고비 포자체의 기내증식을 위한 배양재료 및 배지 구성물질을 구명하기 위해 수행되었다. 포자체의 유묘를 부위별로 나누어 활성탄 0.1%를 첨가한 1/2MS 배지에 다져서 배양한 결과, 근경에서 포자체 재생이 가장 우수하였다. 곱게 다진 근경을 농도를 달리한 MS 배지에 배양한 결과, 1/8MS 배지에서 포자체 형성이 가장 왕성하였으며, 2MS 배지에서는 배양한 절편이 모두 괴사하였다. 상기의 연구를 토대로 1/8MS 배지에 sucrose와 $NaH_2PO_4$의 농도를 조절하여 배양한 결과 sucrose 2%, $NaH_2PO_4\;50mg{\cdot}L^{-1}$에서 포자체 재생이 가장 왕성하였다. 이상의 연구결과, 활성탄 0.1%를 포함한 변형 1/8MS 배지(sucrose 2%, $NaH_2PO_4\;50mg{\cdot}L^{-1}$, agar 0.8%, pH 5.8)에서 포자체 재생이 가장 왕성하였다.

• 한국산업보건학회지
• /
• 제6권2호
• /
• pp.187-201
• /
• 1996

This study was to evaluate the efficiency of diffusive monitor using activated carbon fiber(ACF, KF-1500) in measuring airborne organic solvents. The following characteristics were identified and studied as critical to the performance of diffusive monitor; recovery, sampling rate, face velocity, reverse diffusion and storage stability. For the evaluation of the performance of this monitor, MIBK, PCE, toluene were used as organic solvents. In the sampling rate experiments, eight kinds of solvents (n-hexane, MEK, DIBK, MCF, TCE, CB, xylene, cumene) as well as the above solvents were used. The results were as follows: 1. The desorption efficiencies(DE's) of ACF diffusive monitor ranged from 83 % to 101 %. In contrast, those of coconut shell charcoal ranged from 78 % to 102 %. Especially, the DE's of ACF for the polar solvents such as MEK were superior to those of charcoal. 2. Experimental sampling rates on ACF were average 42ml/min(37-46ml/min) for 11 organic solvents at $24{\pm}2^{\circ}C$, $50{\pm}5%RH$. However ideal sampling rates(DA/L) were 33 % higher than experimental sampling rates. 3. The initial response(15~16 min) of the testing monitor was 2 times higher than the actual concentration determined by the reference methods at $24{\pm}2^{\circ}C$, $8{\pm}5%RH$ and $80{\pm}5%RH$. Within 1 hours, the curve reached a linear horizontal line at low humidity condition. But sampling efficiencies decreased with respect to time at high humidity condition. And sampling efficiencies were higher at high humidity condition than low humidity condition for MIBK. 4. At very low velocity (less than 0.02 m/sec), the concentration of ACF diffusive monitor were poorly estimated. But ACF diffusive monitor were not affected at higher velocity(0.2 m/sec-0.6 m/sec). 5. There was no significant reverse diffusion when the ACF monitors were exposed to clean air for 2 hours after being exposed for 2 hours at the level of 1 TLV. 6. There was no significant sample loss during 3 weeks of storage at room temperature and 5 weeks of storage at refrigeration.

• 환경위생공학
• /
• 제17권3호
• /
• pp.99-109
• /
• 2002

Charcoal $tube/CS_2$ method are more popularly used than any other in the measurement of the working environment for the exposure evaluation of organic solvent, but it is some weak points that the lower accuracy can be obtained on the polar materials and within the range of the low concentration. Thus solvent desorption method has been developed to make accuracy higher and to overcome some weak points. However, because of high price of adsorption tube for thermal desorption and the short of study on its application to the working environment, it is not popularly used in the domestic industrial hygiene fields. This dissertation aims to develop thermal desorption and adsorption tubes for measuring organic solvents in the working environment, by comparing and analyzing breakthrough condition and adsorption capacity with ACF. Specific surface area of ACF used in this study is wider than the one of AC and micropore of ACF related with adsorption has been developed, and adsorption velocity and adsorption amount are very excellent by linking a pore of surface and an inside well into micropore. 1. Result of analysis on physical characteristics of adsorbent, the specific surface area of ACF was 1.3 times higher than that of AC. Distribution ratio of micropore related to adsorption was 94% on ACF and AC. Result of SEM, micropore of the AC is opened to the surface. In contrast, ACF shows that extremely fast adsorption speed. Because of micropore are exposed on the surface and penetrate through each other. 2. Breakthrough characteristics of adsorbents was not different from slop of breakthrough curve. The effluent concentration reaches 10% of initial concentration($C_{out}/C_{in}=0.1$, break point) of ACF was 30~316min longer than that of AC. Therefore, the adsorption capacities of ACF was 1.1~4.6 times higher than that of AC. ACF can be used as a proper adsorbent for measurement of organic solvent.

• 한국의학물리학회지:의학물리
• /
• 제27권3호
• /
• pp.156-161
• /
• 2016

When air discharged from a radioisotope production facility is contaminated with radiation, the public may be exposed to radiation. The objective of this study is to manage such radiation exposure. We measured the airborne radioactivity concentration at a 30 MeV cyclotron radioisotope production facility to assess whether the exhaust gas was contaminated. Additionally, we investigted the radioactive contamination of the air filter for efficient air purification and radiation safety control. To measure the airborne radiation concentration, specimens were collected weekly for 4 h after the beginning of the radioisotope production. Regarding the air purifier, five specimens were collected at different positions of each filter-pre-filter, high-efficiency particulate air filter, and charcoal filter-installed in the cyclotron production room. The concentrations of F-18, I-123, I-131, and Tl-201 generated in the radioiodine production room were $13.5Bq/m^3$, $27.0Bq/m^3$, $0.10Bq/m^3$, and $11.5Bq/m^3$, respectively; the concentrations of F-18, I-123, and I-131 produced in the radioisotope production room were $0.05Bq/m^3$, $16.1Bq/m^3$, and $0.45Bq/m^3$, correspondingly; and those of F-18, I-123, I-131, and Tl-201 generated in the accelerator room were $2.07Bq/m^3$, $53.0Bq/m^3$, $0.37Bq/m^3$, and $0.15Bq/m^3$, respectively. The maximum radiation concentration of I-123 generated in the radioiodine production room was 1,820 Bq/g, which can be disposed after 2 days. The maximum radiation concentration of Tl-202 generated in the radioisotope production room was 205 Bq/g, and this isotope must be stored for 53 days. The I-123 generated in the radioiodine production room had a maximum concentration of 1,530 Bq/g and must be stored for 2 days. The maximum radiation concentration of Na-22 generated in the radioisotope production room was 0.18 Bq/g and this isotope must be disposed after 827 days. To manage the exhaust, the efficiency of air purification must be enhanced by selecting an air purifier with a long life and determining the appropriate replacement time by examining the differential pressure through systematic measurements of the airborne radiation contamination level.

• 한국자원식물학회지
• /
• 제27권1호
• /
• pp.43-50
• /
• 2014

본 연구는 '녹색 꽃잎 도라지'의 기내배양 시 배지구성물질의 적정농도 구명에 의한 대량번식을 목적으로 실시하였다. '녹색 꽃잎 도라지'의 절을 배양재료로 배양조건은 MS배지의 여러가지 구성물질의 농도를 달리한 결과, 1/4MS 배지에서 가장 양호한 부정근의 형성을 보였으나 생장은 1/2MS배지에서 좋았다. Sucrose첨가는 농도가 높을수록 신초와 부정근의 형성 및 생장이 좋았다. 활성탄은 무첨가구에서 가장 많은 부정근의 형성과 양호한 생장을 보였다. 배지의 pH는 4.8로 조절된 배지에서 가장 많은 부정근을 형성하였으며, pH가 높아질수록 그 형성은 낮아지는 경향을 보였고, 부정근과 신초의 생장 또한 pH 4.8에서 가장 왕성하였다. Agar 농도별 실험에서 부정근의 형성과 생장은 그 농도가 낮아질수록 양호한 경향을 보여 가장 낮은 첨가구인 0.4% 농도구에서 가장 많은 부정근의 형성과 왕성한 생장을 보였다. 생장조절제를 혼용 첨가한 경우 신초의 형성은 BA와 IAA의 혼용구가 kinetin과 IAA 또는 NAA 혼용구에 비해 효과적이었으며, BA 0.1 mg/L와 IAA 0.5 mg/L 혼용구에서 절편체당 3.9개로 가장 많은 신초가 형성되었다.

• 원예과학기술지
• /
• 제16권1호
• /
• pp.42-44
• /
• 1998

호접란의 화경액아배양을 호르몬의 첨가없이 대량번식에 이용할 수 있도록 PLB 형성과 증식, 유식물분화를 위한 배지조성을 구명한 결과는 다음과 같다. PLB 형성을 위해서는 1.2X VW 배지에 사과추출물과 감자추출물, sucrose 1%, PVP 1.5g/l 또는 활성 탄소 2.5g/l, gellan gum 4g/l을 첨가하는 것이 가장 양호하였다. PLB 증식을 위해서는 sucrose 2%와 사과추출물과 감자추출물을 첨가한 VW에 cotton plate를 지지물로 사용한 것이 가장 양호하였다. 유식물의 재분화를 위해서는 Hyponex 3g/l에 사과와 감자추출물을 각각 3%, 바나나추출물은 4%를 혼용첨가한 배지가 가장 효과적이었다.