This study was carried out to develop a system to reduce ultrafine dust using hygroscopic materials such as glycerin and propylene glycol. Prior to the development of an ultrafine dust reduction system, the moisture condensation efficiency of glycerin and propylene glycol was investigated based on relative humidity (RH). The results showed that when no substances (glycerin and propylene glycol) were added to a tedlar bag, the relative humidity and temperature remained constant. The moisture condensation efficiency of glycerin was 60%, and the time it took to reach 50% of the initial relative humidity was about 40minutes. In the case of propylene glycol, the moisture condensation efficiency was 75%, and the time it took to reach 50% of the initial relative humidity was about 10 minutes. When glycerin and propylene glycol mixture was added, the moisture condensation efficiency was 68% and it took 20 minutes to reach 50% of the initial relative humidity. These results suggest that hygroscopic materials such as glycerin and propylene glycol can actually condense moisture in the atmosphere. In addition, considering actual atmospheric conditions, the relative humidity was set to 60% and 40% or less, and the moisture condensation efficiency was measured. The results showed that the mixture of glycerin and propylene glycol yielded the highest condensation efficiencies, at 69% and 62%, respectively. Therefore, it is preferable to use a mixture of glycerin and propylene glycol to condense moisture in the range of relative humidity in the actual atmosphere.

This study was conducted to investigate the characteristics of waterfowls communities by point-count methods from December 2007 to February 2008 at seven lagoons located in eastern sea shores. We mapped the distribution pattern of waterfowls at the grid size of 30 × 30 meters and compared the area and patton’s diversity index with the characteristics of waterfowls’ communities. We suggest the two factors like density of Greater Scaup and the ratio of dabbling and diving ducks as characteristics of waterfowls at lagoons. Three lagoons like Gwangpo, Maeho and Hyangho showed the low values of above two factors. Patton’s index was a good predictor of species richness of waterfowls and size and perimeter length of lagoon was a good predictor of species richness.

We developed the “Nest Finder System” to detect the breeding ecology of cavity nesters. Nest Finder System is composed of three parts, camera, transfer and recorder parts. In camera part, we utilized three types like pin camera, CCTV camera and endoscope with CMOS lens. Electricity and information was transferred with cable lines, and the information were directly recorded into sony digital recorder (GV-HD 700) or hard disk. To survey the breeding status of cavity nester, we disassembled the cone lens (TVC-MN4428C) applicable to enter the natural tree hole ranging no less than 30 mm. To support the camera and transfer part reaching at the hole located about 15m height, we used a couples of carbon poles in size of 1.8m, and its slender ending part was designed to fit each other. Nest Finder System can be applied to monitor breeding status of forest wildlife including cavity nesters, canopy nesters and aquatics. We discussed the potential problem in applying the equipment and analyzing the obtained data. Nest Finder System enable us to monitor the inner part of nest located at the upper part of trees not only coniferous and deciduous forests, and it can be applied to monitor the breeding ecology of aquatic organism.