• 치위생과학회지
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• 제3권1호
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• pp.15-21
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• 2003

사회생활의 위축원인요소이며 현실적으로 타인에게 불쾌감을 주는 요인이 되는 구취의 사회관심도와 치료에 대한 기초자료를 확보할 목적으로 일반성인 552명을 대상으로 구취에 대한 인식도, 식 습관, 관심도에 대하여 조사 분석한 바 다음과 같은 결론을 얻었다. 1. 일일 중 구취가 가장 심한 시기는 아침에 일어난 직후가 조사대상자 중 67.6%로 가장 높게 나타났다. 2. 평상시 구취자각자율은 자주 그렇다 남자 4.9%, 여자 2.7%로 가끔 그렇다 남자 71.4%, 여자 52.7%로 남자가 여자보다 높게 나타났다(p<0.05). 3. 자신의 구취지적을 받아본 경험으로 그렇지 않다 38.1%, 가끔 그렇다 32.3% 그저 그렇다 14.1%로 나타났다. 4. 구취느낌의 유형별 분포는 구린 냄새 39.7%, 음식섭취 후 특정음식 냄새 24.5%, 표현이 어려움 18.5%, 계란 썩는 냄새 10.1%, 단 냄새 7.2%로 나타났다. 5. 섭취 후 구취감소로 느끼는 음식은 껌 40.2%, 녹차 31.5%, 매실 9.8%, 사탕 6.5% 순으로 나타났다. 6. 구취를 막기 위한 해결책으로는 잇솔질을 한다 남자 42.7%, 여자 63.2%, 금연이 남자 8.9%, 여자 5.5% 스켈링 남자 6.5%, 여자 3.8%로 나타났으며 흡연이 남자 4.6%, 여자 0.5%로 나타났다(p<0.05). 7. 구취가 날 경우 치료 희망도는 매우 그렇다 9.1%, 가끔 그렇다 28.3%, 그저 그렇다 43.7%로 구취 치료 희망도에 대한 결과가 나타났다.

• Biotechnology and Bioprocess Engineering:BBE
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• 제10권4호
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• pp.315-321
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• 2005

Supercritical carbon dioxide extraction was investigated as a method for removing lipids and bad flavor from tuna viscera. To find the optimum conditions, different experimental variables, such as pressure, temperature, flow rate of solvent and sample size, were evaluated for the effective removal of lipids and the undesirable smell. Ethanol was used as the entrainer, with a $3\%$ by vol $CO_2$ flow rate. By increasing the pressure at constant temperature, the efficiency of the lipid removal was improved and the protein was concentrated without denaturalization. The main fatty acids extracted from the tuna viscera were palmitic acid (16:0), heptadecanoic acid (17:1), oleic acid (18:1) and docosahexaenoic acid (22:6). The major amino acids in the tuna viscera treated by supercritical carbon dioxide were glutamic acid, leucine and lysine, and the free amino acids were L-proline, taurine and L-$\alpha$-aminoadipic acid.

• 기술사
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• 제19권1호
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• pp.25-32
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• 1986

The number of visiters to Bukhan Mt. national park, generation quantity of solid waste and collection system were researched to consider a counterplan for the pollution control of the national park and study for developing the effective treatment of solid waste was tried through the proximate analysis of each component containing. Results obtained in this study were summerized as follows; The great part of visitors go on an excursion to the Bukhan Mt. national park during July and August and also, the solid waste was generated nearly a half of the total amount at the same period. The major collection facilities in the national park were waste basket and incineration box. But the incineration box was too large in volume and very far in distance, and its collection period was irregular, so it was cause to the congestion of solid waste and bad smell and dirty. Therefore, to complete collection of solid waste, we must set up the waste basket which able to find within 40～50m from the origination place of solid waste and induce the visitors to throw the solid waste. It was obtained as moisture content: 48.5 wt%, volatile solid: 28.4wt％, fixed solid: 23.1 wt％, lower heating value: 1,320kca1/kg from experimental analysis of solid waste. According to this analysis, the incineration operation is possible, but the generation quantity of solid waste was too small to construct incineration plant for heat recovery. It was found that it is suitable for the aerobic composting by mixing with the night soil which generate in the national park after the recovery of resources such as metals, glasses and plastics.

• 한국인쇄학회지
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• 제22권2호
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• pp.199-211
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• 2004

The drying speed of gravure ink are very fast because of evaporation drying type. The gravure ink are fitly selected variety resin and solvent for a wide range printing are adopted. Moreover, after-manufacture handling is necessary to various purposes. Though composition of gravure ink are same those of another printing ink, the viscosity of it are vary low compare with another printing inks. As property of variety printed matters, improvement of performance of printing layer and suitable after-manufacture handling, the more research of gravure ink are to be continue for development of printing technology. Generally, the gravure ink are made up resin, pigment, solvent and additive. Especially solvent are fitly selected for solution of resin, viscosity, and drying speed. Furthermore, it tis care of bad smell of remaining resin, poison and danger of fire of it. Because of the prevention of air pollution as restriction deflation of solvent, custody of dangerous object and improvement of work environment as labor safety hygiene and fire-low, the environment restriction of printing business become strict. This study has purpose of development of gravure ink of involved 30% below of alcohol is used for PVC film printing.

• 한국산학기술학회논문지
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• 제11권2호
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• pp.614-619
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• 2010

수산시장이나 어항에서 발생하는 수산폐기물을 수거하여 처리하는 과정은 긴 시간과 불결한 처리로 악취발생 및 비위생적인 면이 많아 민원의 대상이 되어 왔다. 이것을 수거하여 완전 처리하는 기술을 적용하면 비위생에 대한 민원이 없어지고 자원재활용의 비율을 확실히 높일 수 있다. 본 논문에서는 지방과 단백질이 풍부한 수산폐기물을 증류건조시켜, 고형물은 가축사료로 활용하고 응축수는 탈취제나 하수처리장의 외부탄소원으로 활용하는 완전 재활용공법을 소개한다.

• 설비공학논문집
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• 제19권10호
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• pp.695-702
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• 2007

In this paper, the ventilation efficiencies of an underground sewage disposal plant were investigated for ventilating system without fan, ventilating system with eleven cross flow fans and ventilating system with sixteen cross flow fans by numerical method. It has been found that the air change effectiveness of the system without fan was predicted 0.44. It means that an additional ventilating equipment is needed to maintain good indoor air quality. For the ventilating system with sixteen cross flow fans, the air change effectiveness was predicted 0.55. The air change effectiveness of the ventilating system with eleven cross flow fans was predicted 0.51. It is known that the air change effectiveness above 0.5 is enough to eliminate pollutant and bad smell in the indoor. Therefore, it is recommended to select the ventilating system with eleven cross flow fans for the underground sewage disposal plant in an economic point of view.

• 한국식품영양학회지
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• 제19권4호
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• pp.427-434
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• 2006

This study was performed to investigate the consumption and the preference of chungkukjang products among the middle school students. The subject were 538 middle school students(male 283, female 255) in $3^{th}$ grade, and were asked to fill out the questionnaire. The collected data were analyzed by SAS package. The result showed that most students knew about traditional chungkukjang(88.5%) and chungkukjang powder(68.2%), but only 43.5% and 29.4% of the respondents knew about raw chungkukjang and chungkukjang pill, respectively. When asked how often they eat chungkukjang products, traditional chungkukjang were taken often, but chungkukjang powder, raw chungkukjang and chungkukjang pill were shown to be taken relatively less. Over 60% of the students responded that they liked chungkukjang products, because of 'encourage by parents' and 'good for health', but there was no statistical difference by gender. When asked about the reasons for the dislike of the chungkukjang products, male students responded 'bad smell'of traditional chungkukjang, while female students 'eplied' not eating at home'. The students disliked the chungkukjang powder, chungkukjang pill and raw chungkukjang because of 'not knowing it.' These results showed that the social interest and support for the chungkukjang products were necessary and there was a need to advertise the chungkukjang products.

• 한국가구학회지
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• 제24권4호
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• pp.345-349
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• 2013

Yellow poplar is well known commercial hardwood species in the world because of its availability, rapid growth, large size, excellent form, early natural pruning, and the good working quality of the wood. Therefore, yellow poplar (Liriodendron tulipifera L.) has been adopted in South Korea for decades ago, and its cultivating the saplings and silvicultural system have been studied. However, yellow poplar is still embroiled in controversy for utilization of use and worth. This species has not only advantages such as lower weight, light color, and higher machinability and bending processing, but also has disadvantages which are bad smell and different colors on heartwood and sapwood. In this study, the objective was that use of yellow poplar board as furniture materials by drying and painting process. Thirty years old yellow poplar was cut and dried for 7 days by high-frequency dryness. Adjustment of color tone to walnut color was conducted with multiple colorants and various number of spread times. Uniform color of yellow poplar on heartwood and sapwood was accomplished by applying 1 time stain (green), 2 times transparent primer, 1 time middle-painting (walnut), and 2 times top-painting (walnut) in sequentially. The painted yellow poplar board was used to manufacture table and dressing table. During the furniture manufacture process, no critical issues were occurred on part of jointing and painting. This painting method may be useful data for future use of yellow poplar as furniture materials.

• 한국안전학회지
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• 제32권2호
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• pp.1-6
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• 2017

Modern society has been experiencing by population growth and urbanization that bring, a change of eating habits which has occurred a various types of waste in a large amount. Even though these wastes are required an immediate treatment with difficulties unsanitary handling and existing waste treatment method are by incineration, fermentation, drying and etc. however a bad smell occurs after the treatment that need's a lot of energy in processing organic wastes with high moisture contents and wasteful and inefficient problem. The strength assessment of the organic waste agitating vessel is required in terms of safety due to the differences of loading on the shaft that was treated by agitating the mixture of food waste. The damage of agitating axis is depended on steam pressure, temperature condition and the force moment that exerted by the food waste. Thus the strength assessment and stability evaluation are very important, especially to handle a hard waste. In this study the rotation capacity of agitation is about 5 tons considering general structural rolled steel pressure vessel strength and steam pressure. The purpose is to estimate the safety and strength evaluation for a agitator axis and impellers according to the rotating angle of the axis under the condition of the 3.2 ton capacity reactor.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2008년도 춘계학술대회논문집
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• pp.534-537
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• 2008

Growing attention has been given to sterilizing and antibacterial effects of nano-silver, recently. Nano-silver solution can be applied to the heat exchanger in an air conditioner to prevent bad smell or bacteria. The present study is directed at the nozzle spray characteristics over a heat exchanger. This problem is of particular interest in the design of a nano-silver HVAC system. The effects of nozzle position and flow rate on the spray area over a horizontal surface have been investigated for various nozzles. The results obtained indicate that spray area is increased as the height of spray position is increased or mass flow rate is increased. The wetted area over a practical heat exchanger is also studied at a given nozzle height. It is found that the wetted area is gradually increased with an increase in the flow rate. However, the effect of flow rate on the wetted area is a little affected by flow rate in the range of too much flow rate. It is also found that the wetted area is decreased as the inclination angle of a heat exchanger is increased.