• The Transactions of the Korean Institute of Electrical Engineers P
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• v.65 no.4
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• pp.262-267
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• 2016

This paper describes a design of a hair drier to improve its performance. the performance of the hair drier can be improved by increasing the wind velocity of its discharge port. the design of the hair drier is accomplished by using the CFD. the validity of design results were verified by comparison with the dry change of the hair drier. In this paper, the initial condition of the applied hair drier is as follows, the number of the blade is 9, the diameter of the suction port is 40[mm], the tip clearance is 12.5[mm], the con angle is $28.5^{\circ}$ and the fan angle is 27.5R. From design results, the enhanced condition of the hair drier can be obtained as follows, the number of the blade is 3, the diameter of the suction port is 50[mm], the tip clearance is 10.5[mm], the con angle is $21.5^{\circ}$ and the fan angle is 75R. At the enhanced condition of the hair drier, the wind velocity of the hair drier is 29[%] increase, and the dry time is 40[%] increase compare to the initial condition of the hair drier.

• Proceedings of the KIEE Conference
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• 1997.11a
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• pp.567-569
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• 1997

A control system using a PLC has been developed for a single tower drier(STD) in a CANDU type nuclear power plant. This system will replace the existing STD control system which was implemented with mechanical timers and relays. The new control system makes it possible for an operator to perform more precise time and dew point control for the STD, thanks to the high efficiency and flexibility of the PLC. The operational cost for the control system is much reduced compared to the existing system.

• Proceedings of the KIEE Conference
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• 1998.07g
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• pp.2321-2323
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• 1998

A control system using a PLC has been developed for a dual tower drier(DTD) in a CANDU type nuclear power plant. This system will replace the existing DTD control system which was implemented with mechanical timers and relays. The new control system makes it possible for an operator to perform more precise time and dew point control for the DTD, thanks to the high efficiency and flexibility of the PLC. The operational cost for the control system is much reduced compared to the existing system.

• Journal of Korean Society of Forest Science
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• v.99 no.2
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• pp.251-257
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• 2010

Influences of environment (indicated by plant associations) and forest management practices on the distribution of Armillaria spp. and genets (vegetative clones) were investigated. A total of 142 isolates of Armillaria was collected from various host trees on pristine and managed sites (thinned and/or fertilized) growing in relatively wet and dry environments in eastern Washington, U.S.A. The incidence of Armillaria spp. was significantly higher in the relatively wetter sites than the relatively drier sites, as indicated by plant associations. However, no differences in Armillaria occurrence were found among different forest management practices (control vs. thinned vs. thinned and fertilized) within both wetter and drier sites. Incidence of Armillaria was significantly different among conifer and shrub species. The highest proportion with Armillaria was found on grand fir (Abies grandis). Based on pairing tests and rDNA sequencing, the 142 isolates were comprised in a total of 20 genets representing three Armillaria species. More diverse Armillaria spp. were found in both relatively wetter and relatively drier sites within the undisturbed control plots, compared to plots disturbed by forest management practices. The results from this study provide baseline information toward understanding how environment and forest management practices influence incidence and diversity of Armillaria species and genets.

• Journal of Wellbeing Management and Applied Psychology
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• v.7 no.4
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• pp.15-20
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• 2024

Purpose: Climate change is greatly affecting the frequency and intensity of fires around the world. The main effects of climate change on fires are rising temperatures, dry seasons and extreme droughts, changes in precipitation, increased strong winds, extended fire danger periods, and changes in natural ecosystems. Several factors due to climate change are increasing the risk of large-scale fires, such as wildfires. Research design, data and methodology: Rising temperatures caused by climate change will make forests and grasslands drier, make it easier for wildfires to occur in drier environments and spread quickly to wider areas, and the generated wildfires will release large amounts of greenhouse gases into the atmosphere, such as carbon dioxide (CO₂), and the released greenhouse gases will strengthen the global greenhouse effect, further raising the temperature. As temperatures rise, the risk of wildfires increases in drier environments, and this process is repeated, leading to a vicious cycle of intensifying climate change as more fires occur and more greenhouse gases are released. Results: In conclusion, climate change is increasing the risk of fire occurrence and this phenomenon is expected to become more frequent and severe in the future. Conclusions: In order to cope with the increasing fire risk caused by climate change, fire prevention and management. Fire detection and response systems need to be strengthened, supportive policies and international cooperation are needed to restore ecosystems, and these measures, along with fire prevention, management and countermeasures, should take into account long-term climate change and adaptation as well as short-term responses.

• Proceedings of the Korea Society of Design Studies Conference
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• 2002.05b
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• pp.210-211
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• 2002

• Proceedings of the Korea Contents Association Conference
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• 2006.05a
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• pp.470-474
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• 2006

In the case of dryer tendency that select directly without being serviced with salesperson's opinion specially because it does Purchase with sufficient knowledge is package of goods being high and labeling for goods of consumers are indicated to very important element This development wishes to escape and use "Seramik heater" and apply electromagnetic waves cover skill to be Hair Drier that head of a family electromagnetic waves are happened in method and household electric appliance that can raise sexual intercourse of circle infrared rays and High efficiency quantity of heat and coincide in high efficiency and All function anger request in existent metal heat ray.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.10a
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• pp.214-217
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• 2001

Microwave continuous drier system mostly uses the ISM frequency band(915MHz or 2450MHz). It dry the material off from it's inside by the electromagnetic wave. The structure whose openings is needed for dry system to continuously feeds a materials into the system. So it is too difficult to shield the leakage of electromagnetic energy through the apertures. In this paper, we designed microwave continuous drier structure which operates at 2450MHz and analyzed the field distributions at the internal and external region of the structure.

• Journal of Biosystems Engineering
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• v.3 no.1
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• pp.33-46
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• 1978

To get the goal of self-supply of food grain, improvement of post-harvest grain operations in rural area is under consideration as an important task of agriculture in Korea. This is study is focused on elimination of losses and deteriorations of grain and reduction of labour requirements and funds for post-harvest grain operations. The purpose of this study are presentation of basic data referring to conventional post-harvest grain operations in rural area and suggestion of improving methods for the operations, and also finding out reasonable operating processes of the operations. The result of this study are follows; 1. Grain drying in-the-filed which is performed before threshing has major factors of grain loss during drying, and so should be restrained as possible. Combine harvesting system is recommended among other king of mechanized harvesting systems for restraining in-the-field drying and securing available labors for drying. 2. It is predicted that mechanical grain drying could be prevalent when combine harvesting is taken place. Recommended grain drier for pre-combine harvesting system and for combine harvesting system is batch-type drier and circulating -type drier, respectively. 3. As existing farm storages for grain have insufficient spaces and offer poor conditions for grain storing , it is greatly needed to build up new storage which store only grains. And it is concluded that storing grain in community common storages in desirable. 4. Power supplying system for milling machinery in local milling plants, that a large capacity prime mover supplies power to 4 to 6 kinds of milling machinery simultaeously, should be converted to a system of several small capacity prime movers supplying power to each machiner y for the purpose of reducing extra consumption of energy. 5. Governmental grain, of which Korean farms produced, should be milled and stored in the local milling plant successively for the purpose of reducing transportation fee and stroing facilities. 6. Furture post-havest grain operations-drying, storing and milling should be periormed successively in he community common plant. And average optimum processing capacity of the plant is estimated about 300 metric ton of grain every year.

• Journal of Biosystems Engineering
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• v.4 no.2
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• pp.25-31
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• 1979

본연구는 건조에 필요한 열과 공기를 열원으로부터의 자연대류만에 의존하는 간역화력건조기의 성능향상을 도모하기 위하여 실시되었으며 옥수수를 대상으로 모형실험을 통하여 분석한 결과는 다음과 같이 요약된다. 1. 건조기 화구의 공기열입구의 크기는 송풍량에 영향을 미치며 공기의 유입속도가 16m/min 이하가 되도록 충분히 만들어야 한다. 2. 곡물층을 통과하는 송풍량은 곡물층의 두께가 클수록 증가하며 송풍량과 곡물층 두께와의 관계는다음식으로 나타났다. $q=CD^{-k}$ 3. 송풍량은 실험범위내에서는 열원으로부터 곡물층의 높이와 가열공기의 온도상승에 따라 각각 직선적으로 증가하였다. 4. 송풍량은 곡물층의 두께, 열원으로부터의 곡물의 높이 및 가열공기의 온도상승에 의하여 옥수수층의 경우 다음과 같이 추정될 수 있다. $ q=0.00265H(\Delta T) D^{-0.76}$ 5. 바람이 송풍량에 미치는 영향은 매우 커서 8km/hr의 풍속을 가진 바람이 유입구측으로부터 볼 때 송풍량은 바람이 없을 때보다 무려 5배나 증가하였다. 6. 건조실의 전후방간의 가열공기의 온도차이는 열원으로부터 곡물층의 높이가 낮을수록 증가하였으며 이 현상은 바람이 불 때 더욱 현저하게 나타났다. 7. 건조기의 벽면을 통한 열손실은 열원으로부터 곡물층의 높이와 가열공기의 온도상승에 따라 각각 직선적으로 증가하였다.