The purpose of this study was to assess the removal efficiency of formaldehyde using carbon nano colloid (CNC) which was produced by comparatively easy and cheap method. In this study, carbon nano colloid based on water was produced by an electro‐chemical method. The particles which have mostly a spherical shape whose diameter was, what is called,‘nano‐size’were produced. Non‐woven fabric filter, which is currently on the market as a medium filter, was used for the removal efficiency test. Known concentration (0.5 ppm) of formaldehyde standard gas was used as a pollutant. The overall results indicate that (1) nanosize carbon colloids which have a stable dispersibility of which diameter is approximately 10 nm or less, (2) filters treated with carbon nano colloids showed higher removal efficiency, 44.47 ㎍ of HCHO removed/g of carbon and 19.28 ㎍ of HCHO removed/g of carbon, compared to the control experiment using a normal carbon filter, 1.45 ㎍ of HCHO removed/g of carbon.

Recently, functional building materials have been developed and introduced to the market. Many building materials emit volatile organic compounds(VOCs) which have the potential to affect health and comfort, and moisture problem has a major role also being established in indoor air quality (1AQ) problems. The purpose of this study is to evaluate the performance of reduction of HCHO using the gupsum board and water vapour adsorption/desorption property for ceiling board for mock-up test room and test house. The mock-up test is conducted according environmental standard method for indoor air quality of the ministry of environment. The results of this study are as follows, the reduction of HCHO gypsum boards are showed an effect to reduce the formaldehyde(HCHO) concentration of mock-up test room and test house. The indoor humidity is also showed to be lower than the general ceiling materials, since there is increased in the absorbed indoor humidity by using a humidifier with moisture adsorption/desorption ceiling materials. In natural conditions, moisture adsorption/desorption ceiling materials is showed a higher humidity than general ceiling materials constructed in the mock-up test room. However It changes of moisture adsorption/desorption is not appeared in test house. Therefore, in case of decreasing and increasing in humidity, these materials can be offset by reduction of HCHO using the gypsum board.

In order to improve indoor air quality of apartment, indoor ventilation system had to be installed in each unit, from 2006 in Korea. However, a duct which is connecting each room in ventilation system became a flanking path of sound. Sound which is generated in one room can easily transmitted into the adjacent room by the duct and speech privacy in apartment room can be seriously degraded. In this study, low noise duct system consisted of noise diffuser and multi drop chamber was developed and noise reduction performance was measured in mock-up system. Noise reduction performance of low noise duct system was compared with conventional duct system. From the result of measurement, it was found that noise diffuser reduce more than 10 dB in the range of 200 Hz and higher frequency band, also multi drop chamber was effective in 2000 HZ and higher frequency band. Noise reduction performance of low noise duct system is effective in the frequency range (from 300 Hz to 4000 Hz bands) of speech conversation.

This paper has attempted to analyze asbestos dismantlement and removal companies' licensing procedure and their work satisfaction and observance of laws and regulations and discover problems for improvement of the current system. In terms of the number of asbestos dismantlement and removal companies by region, Seoul and Gyeonggi (32, 43.2%) were the highest, followed by Jeonnam, Jeonbuk and Jeju (19, 25.7%), Gyeongnam and Gyeongbuk / Chungnam and Chungbuk (8 apiece, 10.8%) and Gangwon (7, 9.5%). In terms of the number of asbestos dismantlement and removal works, it has rapidly increased from 33 cases (1.4%) in 2005 to 598 (25.1%) in 2007 and 1,599 (67.2%) in 2008. In terms of preliminary investigation on asbestos, asbestos-related education and work environment by region, a significant statistical difference has been observed. According to analysis on the asbestos dismantlement and removal companies' satisfaction (in terms of the appropriateness of dismantlement and removal cost), 'unsatisfied (35 companies, 47.3%)' was the highest, followed by 'not bad (20, 27.0%)' and 'satisfied (19, 25.7%),' showing high dissatisfaction on the cost. In terms of the asbestos dismantlement and removal companies' satisfaction at work, Factor 1 accounted for 39.3% while Factor 2 was 16.8%, which showed 56.2% in total.

when adopting and implementing GHS system in Korea and to draft the revision proposal for Industrial Safety and Health Act taking into account of unique domestic situation. The research method is to conduct a survey for 2 month period from early April to late May in 2006 to 830 randomly selected chemical manufacturing, importing and exporting, and consumption companies out of all the companies surveyed by the Ministry of Labor under 2004 Work Environment Status National Survey. A total of 610 survey was collected and analyzed. The results of this thesis is summarized as follows , First, based on the survey analysis it is vital to conduct a national PR using pamphlet, internet, and daily newspaper and to provide technical assistance such as training expert and publishing GHS manual by expert organization such as Korea Occupational Safety and Health Agency (KOSHA) for early settlement of GHS in Korea. Second, it is also needed to give a grace period of 1 to 2 years to minimize the dramatic impact for industry, to encourage the establishment of the GHS team utilizing safety managers within companies, and to develop and distribute the standard GHS software by government. Third, taking into account of difficult situation of small companies, KOSHA needs to provide a full technical and financial support for companies with less than 100 employees and especially for chemical manufacturing companies. Fourth, it is also needed to operate an Interministrial GHS Committee (IGC) involving 7 related ministries for smooth GHS implementation and to develop an infra by sharing responsibilities among related ministries and establishing internationally recognized organization for hazard classification, labelling, and MSDS.