• 한국산업보건학회지
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• 제30권3호
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• pp.270-279
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• 2020

Objective: The aim of this study was to propose revision of the occupational exposure limit(OEL) for 1-Bromopropane(1-BP) following a review of the appropriateness of the standard in light of increasing epidemiological data and handling risk. Materials and Methods: The results of toxicity and epidemiologic investigations for 1-BP and agencies' OELs were compared and reviewed through a literature review. In order to investigate the status of 1-BP handling in South Korea, data from work environment actual condition survey results and work environment measurement results were used. Results: The toxicity of 1-BP, such as central nervous system(CNS) damage, peripheral neuropathy, hematological adverse effects, and developmental and reproductive toxicity(male and female) has been reported. ACGIH recommends 0.1 ppm as a TLV-TWA value, but the OEL of South Korea stands at 25 ppm, which is 250 times higher than the TLV-TWA. Although 1-BP is a specially managed substance under the Industrial Safety and Health Law, the currently applied OEL cannot be said to be a safe level based on the results of epidemiological studies to date. In a work environment measurement in 2017, the total number of samples was 626, which were derived from 78 industries, and the average concentration was 1.173 ppm(standard deviation 2.88). Conclusions: To protect the health of workers handling 1-BP, estimated to be 780 in South Korea, it is necessary to strengthen the OEL(TWA) to a level of 0.3 ppm(lower than the 0.34 ppm with known toxic effects), which is believed to be safe as a result of epidemiological investigation. "Skin" notation should be recommended.

• Journal of Plant Biotechnology
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• 제30권1호
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• pp.65-71
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• 2003

본 실험은 그늘쑥을 Agrobacterium을 통해 형질전환체인 모상근을 유기하고 모상근의 대량배양을 위해 모상근이 가장 잘 자라는 생장 조건을 찾기 위해 수행되었다. 실험 결과를 종합해 보면 선발된 그늘쑥 모상근 세포주의 대량 생산을 위한 최적 배지는 MS 기본 배지임을 확인하였다. 또한 최적의 havesting time 모상근의 성장률이 좋고 갈변과 배지의 미생물 오염도가 적은 4주가 적당한 것으로 판단된다. 그리고 광 처리 하에서 모상근을 배양하는 것보다는 암상태에서 모상근을 키우고 pH는 5.8 정도가 탄소원은 sucrose로 3.5%가 모상근 을 대량배양시 최적조건임을 확인되었다. 미량원소인 Fe$^{2＋}$은 0.1 mM을 처리하는 것이 모상근의 성장을 촉진하였으며 spermine과 spermidine은 각각 10 mM와 100 mM로 처리하는 것이 모상근의 성장을 높일 수 있다. 앞으로 연구는 이 결과를 토대로 모상근 대량 배양을 위한 scale up조건과 bioreator의 설계에 관한 연구가 필요하다.

• 한국식물병리학회지
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• 제13권4호
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• pp.210-214
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• 1997

포도 흰가루병균(Uncinula necutor)의 분생포자 형성, 발아 및 균사 초기생장에 미치는 중요 환경오인과 살균제의 영향을 구명하기 위하여 수행한 연구 결과를 요약하면 다음과같다. 분생포자 형성은 상대습도 76~96%에서 가장 좋았다. 포자 발아 및 균사 초기생장은 증류수에 비해 5% 한천배지에서 좋았으며, 온도 $26^{\circ}C$, pH 5.0일 때 가장 좋았다. 광 100 lux는 암상태와 발아율에 차이가 없었으며 한천배지에 포도 엽즙액 30%를 첨가한 배지에서는 순수 한천배지 보다 좋았다. 또 triazole계 살균제 첨가 배지에서의 포자발아 및 균사생장은 살균제 농도증가에 비례하여 급격히 감소하였으나 그 정도는 살균제의 종류에 따라 차이가 있었다. 특히, myclobutanil은 농도증가에 따른 발아율의 감소정도가 매우 낮았다.

• Journal of the Korean Wood Science and Technology
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• 제17권4호
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• pp.57-69
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• 1989

Roughage feeds were produced from Hyun-aspen (Populus alba $\times$ p. glandulosa) by steaming-defibration and steaming-explosion. The objectives of this work were to find proper conditions for the treatment of Hyun-aspen by analyzing the compositional change and digestibility and to investigate the change of physical properties of exploded woods. The results of this work were as follows; 1. The method of steaming-de fibration gave the best producing rate of feedstuffs when the chips were steamed (9kg/$cm^2$ under the pressure) for 10 minutes. The yield and the digestibility of feedstuffs were 84.2% and 38.1%, respectively. It is the merit of this method that feedstuffs manufactured by this method was uniformity in particle size, and facilities of fiberboard factory could be used directly, 2. For defibration of the chip by explosion, the proper condition was steamed under the pressure (20kg/$cm^2$) for 4 minutes. The yield and the digestibility of feedstuffs were 93.4% and 68.1%, respectively. The feedstuffs produced under these conditions had higher nutritional quality than rice straw and this method was considered as the best for making feedstuffs from Hyun-aspen chip. But it is defect that exploded feedstuffs was ununiformity in particle size and had unique odor. The physical properties of the feedstuffs were investigated by a light microscope and a TEM. The feedstuffs produced under the low pressure (20 kg/$cm^2$) still maintained the structure of fibers. However, the feedstuffs produced under the high pressure (28 kg/$cm^2$) resulted in higher de fib ration than these prepared under the low pressure. The highly defibrated feedstuffs recombined with solublized lignin. The crystallinity of feedstuffs was increased by 10% and micelle width increased double after treatment.

• 한국문헌정보학회지
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• 제43권2호
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• pp.299-328
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• 2009

본 연구에서는 네이버, 다음, 알라딘, Amazon, Google, KERIS, LibraryThing, OCLC 등 8개의 도서용 Open API 현황을 비교 분석하였다. 그리고 C대학교 도서관의 서지레코드에서 '광학'(DDC 535) 분류 167건의 표본 서지레코드를 선정하여 Open API의 활용성을 비교 분석하였다. 이러한 분석결과를 토대로 Open API를 이용한 서지레코드의 접근점 기능 확대와 목록 확장에 유용하다고 판단되는 12개의 Open API 적용 모형을 실험적으로 구현하였다. 또 통합서지용 KORMARC 001, 010, 012, 020, 035, 246, 505, 520, 850, 856 필드들을 대상으로 Open API를 이용하여 서지레코드의 접근점 기능 확대와 목록 확장방안들을 고찰하였다. 마지막으로 표본 서지레코드의 OPAC 검색결과 간략화면과 상세화면을 대상으로 Open API를 이용하여 목록 확장방안들을 예시로 구현하였다.

• 패션비즈니스
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• 제12권6호
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• pp.46-60
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• 2008

Lyocell is a regenerated cellulosic fiber manufactured by an environmentally friendly process. The major advantages of lyocell are the excellent drape forming property, the genuine bulkiness, smooth surface, and high dry/wet tenacities. However, one drawback of lyocell is its fibrillation property, which would degrade its aesthetic quality and lower the consumer satisfaction. In our previous studies, lyocell was treated with epichlorohydrin, a non-formalin based crosslinker, to reduce its fibrillation tendency. To investigate the changes of physical properties upon ECH-treatment, the hand characteristics of ECH-treated fabric were observed using KES-FB system and the 3D-virtual sewing image of the fabrics were obtained using 3D CAD simulation system in this study. Since epichlorohydrin(ECH) treatment was conducted in the alkaline medium, the weight reduction was observed in all treated lyocell. The treated lyocell became light, smooth and flexible in spite of ECH crosslinker application. LT and RT in tensile property upon the ECH treatment did not change significantly, however, EMT and WT in the tensile property increased. The significant decrease in bending rigidity was resulted in all ECH-treated lyocell, which is the result of the weight loss upon the alkali condition of ECH treatment. The bending rigidity increased again in the ECH 30% treated lyocell, however, the B value is still lower than the original. Therefore, the ECH-treated lyocell would be more stretchable and softer than the original. Shear rigidity was also decreased in all ECH-treated lyocell, which would result in more drape and body fitting when it is made as a garment. The ECH-treated fabric showed the softer smoother surface according to SMD value from KES evaluation. The virtual 3D sewing image of the ECH-treated lyocell did not show a significant change from that of the original except ECH 30% treated lyocell. ECH 30% treated lyocell showed a stiffer and more puckered image than the original.

• 패션비즈니스
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• 제21권2호
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• pp.105-112
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• 2017

A string wallcovering is a kind of textile wallcovering which is made of cellulose fiber yarn laminated on base paper. Compared with normal paper or PVC wallpaper, a string wallcovering is preferred continually in the interior design market, as it is not only environmentally friendly but it also has less cost on mass production without the weaving process and has a natural visual effect, excellent functionality such as thermo keeping, permeability, sound absorption. However, in the dyeing process, it is not appropriate to use plenty of energy such as water, electricity, steam or chemicals considering the environmental trend and the government policy plenty of energy such as water, electricity, steam or chemicals. Currently, a string wallcovering is made of raw white yarn and padding with direct dye or pigment which includes toxic elements, especially the use of direct dye is restricted in a part of the developed country due to inclusion of azo. In this study, we researched dyeing based on cold pad batch dyeing of a string wallcovering with reactive dyestuff. The peel strength and bending depth test confirmed that the optimum adhesive type and spread amount improved the water resistance of the string wallcovering. Also, pad batch dyeing with optimum reactive dyestuff enhanced the color fastness to light and rubbing in dry and wet conditions. Additionally, for improvement of color fastness to rubbing in a wet condition, the additional treatment finishing without soaping process which is used water. The results of this study can be used as basic data for environmentally friendly and energy saving of the textile wallcovering.

• 한국자동차공학회논문집
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• 제14권2호
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• pp.100-106
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• 2006

The behavior of spray impinging on the inclined constant temperature flat plate was experimentally investigated. To clarify the wall effect of a high pressure DISI injector, a relative angle of the inclined wall to a spray axis was varied. Spray penetration along the wall was observed optically and it was compared with that of a Fan spray type and Swirl type spray. To evaluate various spray motion quantitatively, a spray path penetration which describe the development of a spray tip along the wall was newly introduced. To observe the structure of an impinging spray, it was visualized by a controlled stroboscope light and its visualized image was captured on an CCD camera. Using the digital image of impinging spray $H_x$ and $R_x$ was extracted to clarify the structure of impinging spray. The main parameter of the relative position of the wall was the inclined angle which was defined as the angle was varied from $0^{\circ}$ (vertical impingement) to $60^{\circ}$ at the same condition.

• International Journal of Industrial Entomology and Biomaterials
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• 제2권2호
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• pp.123-127
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• 2001

In order to introduce bivoltine races in a tropical country like India, it is necessary to have stability in cocoon crop under high temperature environments. Unlike any temperate country like Japan, the rearing conditions/environment, climatic conditions, quality of mulberry leaf and incidence of diseases are unpredictable in India. Geneticists and breeders of all the sericultural countries have experienced the influence of environment during the process of breeding. in order to select efficiently the breeds with high temperature tolerance, it is verb important to analyse clearly the heritability nature of high temperature tolerance. In light of the above, the present study was undertaken to determine the effect of high temperature treatment of (A) $35{\pm}1^{\circ}C$ and 85${\pm}$5% RH for 24 hrs continuously, (B) $35{\pm}1^{\circ}C$ and 85${\pm}$5% RH for 48 hrs continuously and (C) the control (25${\pm}1^{\circ}$ and 65${\pm}$5% RH in the normal rearing condition from the $3^{rd}of5^{th}$ instar on the pure races such as Moria, Nl37 and Cl46 as well as their Fl hybrids. The overall performance indicate that the hybrids are mare tolerant than the pure races. it was also observed that the overall performance declined in those batches where 48 hrs treatment was given. The most interesting observation noticed in this study was that there was maternal effect regarding temperature tolerance as evident from the better performance of those hybrids where the female parent used was more tolerant as pure race.

• 한국임상수의학회지
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• 제32권2호
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• pp.209-211
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• 2015

5살 샴 고양이가 시력 저하를 주증으로 내원하였다. 안검사 상 양안 실명했으며, 동공 빛 반사는 양안 모두 저하되어 있었다. 전안부에는 이상 소견이 없었지만, 안저 검사에서 양안의 반사판 과반사와 망막 혈관 위축이 관찰되었다. 문진 상 점진적인 시력 소실을 보였으며, 신체 검사 상 감염이나 염증을 의심할만한 증거가 확인되지 않았으므로 이에 유전성 망막 변성으로 진단하였다. 이 증례는 한국 샴 고양이 집단에 유전성 망막 변성을 일으키는 유전자가 도입되었을 가능성을 시사하므로 번식에 있어 주의를 요한다.