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대형 저온진공건조기의 건조 특성에 관한 연구 : 버섯을 중심으로 With Mushroom as the Object Product for Drying
최순열 국립7개대학공동논문집간행위원회 2001 공업기술연구 Vol.1 No.-
In tradition, there have been two kinds of drying methods, which are sun drying and artificial drying. The sun drying method which has been adopted traditionally has been replaced by the hot-air drying method which is one of the most general methods of artificial drying, with its simple drying system, low initial cost of drying plant, and easy operating method. But the hot-air drying method has some defects ; (l)much energy loss happens due to the discharge of hot air during the drying process, (2)control of drying rate is not easy on account of changing relative humidity of inlet air for uniform hot air temperature, (3)high temperature of foods in drying process brings about the production of low-grade drying products. Vacuum drying takes advantage of energy saving and mass production because it reduces the drying time by increasing the drying rate under low temperature condition. The aim of this paper is to develop the low temperature Vacuum dryer, with low initial investments and operating costs, easy operating method and trouble-free operation.
陸上原子力發電爐에 對比하여 船舶用 原子爐의 特性에 관한 考察
崔順烈,蔡元錫 군산대학교 1993 群山水産專門大學 硏究報告 Vol.28 No.1
Since our coutry has in sufficient natural resources, and water covers about 70% of the earth's surface, we must take advantage of our country being a peninsula, and internationalize by marine transportation. However, fuel costs are high, because fossil fuel deposits are limited and oil producting countries are closely banded together. Also, fuel emissions pollute the air throughout the world. Pollution levels for specific gases include 2% for CO2, 4% for SOx, and 7% for NOx. By the way, nuclear power is suitable as a high output power source due to its low cost and its use for powering ships is profitable because of its light weight and small volume. Also, it is most suitable as a power source in water, because it can be used for long term operations, and because oxygen is not necessary for combustion. In the future, if the safety of the marine reactor is made sure by its simplicity and technical development for automation. nuclear power will prove to be the means for future growth in marine transportation. It call be used to power vessels used as ice breakers, and can also be used for deep sea operations, especially submarines used for investigation and resource development. Therefore, I want to study the characteristics of the marine reactor compared with the power reactor, because marine reactor can be used in narrow space and are affected by ocean states. The contents I want to study are as follows. (1) Passive high safety (2) Suitability for various loads (3) Pursuit of small size