경량 폴리머 콘크리트 복합체의 내열성능에 관한 연구

조영국 한국건축시공학회 2008 한국건축시공학회지 Vol.8 No.6

In recent years, the light-weight aggregate has widely been used to reduce the weight of construction structures, and to achieve the thermal insulation of building structures. The purpose of this study is to evaluate the heat resistance of polymer concrete composites with light-weight aggregate made by binders as resin and cement with polymer dispersion. The light-weight polymer concrete composites are prepared with various conditions such as binder content, filler content, void-filling ratio, light-weight aggregate content and polymer-cement ratio, and tested for heat resistant test, and measured the weight reducing ratio, strengths and exhaustion content of gas such as CO, NO and SO2. From the test results, the weight reducing ratio of light weight polymer concrete using UP binder after heat resistance test increase with an increase in the UP content irrespective of the filler content. The weight reducing ratio of polymer cement concrete is considerably smaller than that of UP concrete. In general, the strengths after heat resistance of polymer concrete composites are reduced about 40 to 65% compared with those before test. The exhausted quantity of CO, NO and SO2 gases in polymer concrete composites is less than EPS(Expanded poly styrene). From the this study, it is confirmed that the many types gases discharge according to binder type of polymer concrete composites, its amount is controlled by selection of the binder type and mix proportions. In recent years, the light-weight aggregate has widely been used to reduce the weight of construction structures, and to achieve the thermal insulation of building structures. The purpose of this study is to evaluate the heat resistance of polymer concrete composites with light-weight aggregate made by binders as resin and cement with polymer dispersion. The light-weight polymer concrete composites are prepared with various conditions such as binder content, filler content, void-filling ratio, light-weight aggregate content and polymer-cement ratio, and tested for heat resistant test, and measured the weight reducing ratio, strengths and exhaustion content of gas such as CO, NO and SO2. From the test results, the weight reducing ratio of light weight polymer concrete using UP binder after heat resistance test increase with an increase in the UP content irrespective of the filler content. The weight reducing ratio of polymer cement concrete is considerably smaller than that of UP concrete. In general, the strengths after heat resistance of polymer concrete composites are reduced about 40 to 65% compared with those before test. The exhausted quantity of CO, NO and SO2 gases in polymer concrete composites is less than EPS(Expanded poly styrene). From the this study, it is confirmed that the many types gases discharge according to binder type of polymer concrete composites, its amount is controlled by selection of the binder type and mix proportions.

경량합성 벽체의 전단 성능 평가에 관한 연구

박금성,이상섭,배규웅 大韓建築學會 2007 大韓建築學會論文集 : 構造系 Vol. No.

<P>The purpose of this paper is to evaluate experimentally on the energy dissipation capacity and the shear strength for light-weight hybrid panel infilled with improved fixed-method of the light-weight foamed mortar. The parameters include the presence of light-weight foamed mortar, the specific gravity of light-weight foamed mortar (0.8, 1.2), the finishing materials (light-weight foamed mortar, OSB[Oriented Strand Board], gypsum board). 4 full-scale specimens of light-weight hybrid panels were tested and manufactured. Results of preceding study on the light-weight hybrid panels were compared with test results of this study for improved fixed-method. Results of comparison, By means of light-weight foamed mortar, both the shear strength and the stiffness of light-weight hybrid panels are enhanced as follows; 2.07~2.36 times in peak load, 1.91~2.06 times in yield load, 2.03 times in initial stiffness. Energy dissipation capacity with improved fixed-method appeared increase 1.72~2.46 times. The improved fixed-method was secured sufficiently for lateral resistance.</P>

목초액 함유 경량담체를 이용한 시멘트계 바탕바름재의 성능 평가

김완기(Kim, Wan-Ki) 대한건축학회 2015 大韓建築學會論文集 : 構造系 Vol.31 No.1

The purpose of this study is to evaluate the properties of eco-friendly cementitious surface preparation materials using light-weight aggregate carrier which contains pyroligneous liquid. Four types of light-weight aggregates such as perlite, vermiculite, charcoal and zeolite are selected as a light-weight carrier containing pyroligneous liquid. The cementitious surface preparation materials using acrylic emulsion with light-weight aggregate carrier are prepared with various light-weight carrier replacements to silica sand and tested for flowability, adhesion in tension, water absorption coefficient, resistance about repeating warmth and coldness, crack and impact resistance, antibiosis. And the properties are evaluated in accordance with KS F 4716 and JIS Z 2801. As a result, the performance of cementitious surface preparation materials using acrylic emulsion with light-weight aggregate carrier are satisfied with KS requirements. Also, among the 4 types of light-weight aggregate carrier, the properties of the cementitious surface preparation materials using a zeolite carrier is more remarkable than those of other light-weight carriers. The cementitious surface preparation materials using zeolite light-weight carrier have a outstanding antibiosis over 99% at a light-weight carrier replacement of 20% for silica sand.

구조용 경량골재를 사용한 경량골재콘크리트의 내화특성

송훈,조영국,추용식,이종규 청운대학교 건설환경연구소 2013 청운대학교 건설환경연구소 논문집 Vol.8 No.2

Light-weight aggregate concrete is usually looked upon as a two-component material, consisting of hydrated cement paste and structural light-weight aggregates. The fire resistance properties of light-weight concrete are determined by properties of its components and explosive spalling. Especially, light-weight aggregate concrete is occurred serious fire performance deterioration by explosive spalling. Thus, this study is concerned with explosive spalling of light-weight concrete using structural light-weight aggregates. From the experimental test result, light-weight aggregate concrete is happened explosive spalling. The decrease of cross section caused by explosive spalling made sharp increasing gradient of inner temperature. 경량골재콘크리트는 구조용 경량골재를 사용하여 제조한 콘크리트로 구조물의 경량화를 목적으로 사용된다. 하지만 경량골재콘크리트의 경우 화재에 취약하며 특히 단면결손을 유발하는 폭렬이 발생하기 쉽기 때문에 적용에 대한 사전검토가 필요하다. 본 연구에서는 내화성능이 취약하다고 알려진 경량골재콘크리트의 함수상태에 따른 내화특성에 대해 알아보고자 한다. 실험결과 구조용 경량골재를 사용한 경량골재콘크리트는 실험초기부터 폭렬이 발생하였으며 단면손상에 의해 주근이 노출되는 결과를 보여 내화성능이 취약하였다.

초경량 환경의 보안 서비스 지원을 위한 보안 API

김원영,이영석,이재완,서창호,Kim, Won-Young,Lee, Young-Seok,Lee, Jae-Wan,Seo, Chang-Ho 한국정보통신학회 2008 한국정보통신학회논문지 Vol.12 No.3

유비쿼터스 환경에서의 컴퓨팅 기기들은 초경량 컴퓨팅 환경으로서 사용자들이 컴퓨터의 존재를 인지할 수 없도록 사용자 신체나 주변 환경에 내장되며, 크기가 작고, 적은 기능을 가진 많은 컴퓨터를 여러 곳에 분포하여 네트워크로 통신한다. 초경량 컴퓨팅 환경에서는 사용자들에게 서비스를 제공하기 위해 사용자의 정보를 교환하는 일이 많으며, 사용자의 정보를 보호하기 위해서는 보안 기술이 반드시 포함되어야 한다. 본 논문에서는 초경량 컴퓨팅 환경에서 표준화 된 보안 서비스를 제공하는 초경량 환경을 위한 보안 서비스 지원을 위한 API를 연구하고 설계한다. 초경량 환경의 보안 서비스 지원을 위한 API는 일반적인 컴퓨팅 환경에서와 같이 데이터 암호화, 데이터 인증, 키 관리 등의 보안 서비스를 제공하며, 초경 량 컴퓨팅 환경에 맞는 RC5와 SHA1 알고리즘 사용, 효율적인 메모리 관리를 위해 각 서비스를 라이브러리화하여 필요시마다 라이브러리를 할당/해제하는 등의 초경량 컴퓨팅 환경의 문제점을 해결할 수 있도록 설계, 구현한다. Computers used fer light-weight computing environments are considerably limited in resources and performance running in ubiquitous environment. Because of the limited resources, it is difficult to apply existing security technologies to the light-weight computers. In this paper, light-weight security software is implemented using RC-5 encryption and SHA-1 authentication algorithm which is appropriate for light-weight computing environments. The design of components based on security software of a light-weight computer application and the test-bed for security software are presented. The simulation verifies the correctness of the security software. The architecture of the light-weight and reconfigurable security software for light-weight computer applications is proposed. The proposed security software is small size and provides reconfigurable security library based on the light-weight component and the software manager that configures software platform is loaded with the library at the time it is needed.

플라이애시 및 경량골재를 활용한 경량 내화성 마감재료 개발

송훈(Song, Hun),추용식(Chu, Yong-Sik),이종규(Lee, Jong-Kyu),이세현(Lee, Sea-Hyun) 한국건설순환자원학회 2011 한국건설순환자원학회지 Vol.6 No.4

고층건축물의 구조부재로 적용되는 철골이나 고강도콘크리트로 시공된 경우 내화대책은 필수 불가결한 요소이며 특히, 고강도콘크리트로 적용된 경우 폭렬 등에 의한 단면결손이 발생하기 쉽기 때문에 이에 대한 대책이 필요하다. 즉, 내화성능 확보를 위해 온도상승을 허용범위 이내로 억제하는 대책이 필요하며 이 중 가장 효율적인 방법이 내화성 마감을 실시하는 것이다. 일반적으로 내화성 마감재에 사용되는 시멘트계 재료는 C-S-H, 및 CH가 단계적으로 열 분해되어 압축강도는 저하하게 된다. 내화성능을 발휘하기 위해 고온에서 강도감소가 작고 안정적인 고온특성을 보인다면 보다 효과적으로 성능 발현이 가능할 것이다. 본 연구는 고층건축물의 철골 및 콘크리트 부재의 효과적인 내화성능 발현을 위한 경량 내화성 마감재 개발을 위한 연구로 내화성능이 우수하다고 알려진 Alumino-silicate계 재료를 내화성 마감에 적용하기 위해 고온특성에 대해 검토하였다. 검토 결과, 플라이애시, 메타카올린 및 경량골재를 활용한 경량 내화성 마감재는 고온에서 비교적 안정적인 특성을 발현하여 내화성 마감재로의 효용성을 확인할 수 있었다. The serious issue of tall building is to ensure the fire resistance of high strength concrete. Therefore, Solving methods are required to control the explosive spalling. The fire resistant finishing method is installed by applying a fire resistant material as a light-weight material to structural steel and concrete surface. This method can reduce the temperature increase of the reinforcement embedded in structural steel and concrete at high temperature due to the installation thickness control. This study is interested in identifying the effectiveness of light-weight fire protection material compounds including the inorganic admixture such as fly ash, meta-kaolin and light-weight aggregate as the fire resistant finishing materials through the analysis of fire resistance and components properties at high temperature. Also, this paper is concerned with change in microstructure and dehydration of the light-weight fire protection materials at high temperatures. The testing methods of fire protection materials in high temperature properties are make use of SEM and XRD. The study results show that the light-weight fire resistant finishing material composed of fly ash, meta-kaolin and light-weight aggregate has the thermal stability of the slight decrease of compressive strength at high temperature. These thermal stability is caused by the ceramic binding capacity induced by alkali activation reaction by the reason of the thermal analysis result not showing the decomposition of calcium hydrate. Developed light-weight fire protection materials showed good stability in high Temperatures. Thus, the results indicate that it is possible to fireproof panels, fire protection of materials.

항균기능을 갖는 아크릴 에멀션 모르타르 마감재의 부착성 및 흡수 저항성

김완기,조영국 한국폐기물자원순환학회 2015 한국폐기물자원순환학회지 Vol.32 No.1

The purpose of this study is to develop eco-friendly finishing materials of acrylic emulsion-modified mortars using lightweight aggregate carrier which contains pyroligneous liquid. Four types of light-weight aggregate carriers such as perlite, vermiculite, charcoal and zeolite are selected. The acrylic emulsion-modified mortars are prepared with light-weight carrier replacements to dolomite of 0, 5, 10, 15, 20%, and tested for flowability, adhesion in tension, water absorption coefficient and antibiosis. As a result, the flowability of acrylic emulsion-modified mortars using zeolite light-weight is improved with increasing light-weight carrier content. The adhesion in tension of acrylic emulsion-modified mortars using lightweight carrier is satisfied with KS requirement. Especially, the adhesion in tension of acrylic emulsion-modified mortars using light-weight aggregate carrier at a high temperature of 40℃ are better than the low temperatures of 0℃ and 20℃. The water absorption coefficient of acrylic emulsion-modified mortars using light-weight aggregate carriers is increased with increasing light-weight carrier content. However, the water absorption coefficient is satisfied with KS requirement. The antibiosis of acrylic emulsion-modified mortars using zeolite light-weight carrier is remarkably improved with increasing light-weight carrier content.

판매용 숙주나물의 形態및 綠化에 미치는 광질의 효과

홍동오,전승호,류영섭,이야성,강진호 한국작물학회 2008 한국작물학회지 Vol.53 No.2

Storage conditions of selling mungbean sprouts should affect their marketability. The study was done to examine the effect of light quality (blue, green, yellow, red, far-red) on greening period, shape, fresh and dry weights of mungbean (cv. Zhong Lu 1) sprouts for 5 days to get some information on designing their various polyethylene envelops with different colors. Periods taking to green were 2 to 3.5 days in blue, red and far-red lights but longer than 6 days in green and yellow lights. Yellow lights had the longest total length adding hypocotyl and root, and blue light did the widest hypocotyl diameter while all light treatments showed similar lateral roots for the period. Total fresh and dry weights were the highest in red light but the least in far-red light. Their lengths and weights in green and yellow lights showing the longest periods for their greening declined with increased storage periods but showed no difference between them, meaning that the envelops should be designed mainly by green and yellow colors. Storage conditions of selling mungbean sprouts should affect their marketability. The study was done to examine the effect of light quality (blue, green, yellow, red, far-red) on greening period, shape, fresh and dry weights of mungbean (cv. Zhong Lu 1) sprouts for 5 days to get some information on designing their various polyethylene envelops with different colors. Periods taking to green were 2 to 3.5 days in blue, red and far-red lights but longer than 6 days in green and yellow lights. Yellow lights had the longest total length adding hypocotyl and root, and blue light did the widest hypocotyl diameter while all light treatments showed similar lateral roots for the period. Total fresh and dry weights were the highest in red light but the least in far-red light. Their lengths and weights in green and yellow lights showing the longest periods for their greening declined with increased storage periods but showed no difference between them, meaning that the envelops should be designed mainly by green and yellow colors.

Effect of Self-photoperiod on Live Weight, Carcass and Growth Traits in Quails (Coturnix Coturnix Japonica)

Coban, Omer,Lacin, Ekrem,Sabuncuoglu, Nilufer,Ozudogru, Zekeriya Asian Australasian Association of Animal Productio 2009 Animal Bioscience Vol.22 No.3

The weekly liveweight gain, growing and stress parameters of quails bred using two different types of lighting for 6 weeks following hatching were examined in this study. The first type of lighting was 23 L:1 D, continuous lighting (CL), widely used in the commercial system and the second was a self-photoperiod (SP) system consisting of a continuously lit chamber and a dark chamber the quails could move to as they wished. On the first 15 days, no difference was found in liveweight gain between the two breeding systems. On the $6^{th}$ week when the trial was completed, the liveweight of the male quails upon which CL lighting was used was 159.03 g while the weight of males in the SP group was 174.43 g; these values in female quails of the CL group were 179.15 g and in the SP group were 200.68 g. The CL group had lower testis volume (TVOM, $cm^{3}$) and testis weight (TW, g) than the SP group, however there was no difference between the groups in testis weight/body weight rate (BWTW %). In female quails, the ovary weight (OW, g) and the ovary weight/body weight rate (BWOW, %) values were higher in the SP group. The CL light regime was concluded to cause stress in male quails (CL, Heterophil/Lymphocyte ratio (H/L): 0.27; SP, H/L: 0.17). In conclusion; the SP system allowing the quails to regulate their light periods increased liveweight gain and enabled sexual maturity to be gained at an earlier period than in quail on the CL system and improved their welfare.

Light Intensity and Photoperiod Influence the Growth and Development of Hydroponically Grown Leaf Lettuce in a Closed-type Plant Factory System

강정화,Sugumaran KrishnaKumar,Sarah Louise Sua Atulba,정병룡,황승재 한국원예학회 2013 Horticulture, Environment, and Biotechnology Vol.54 No.6

Effect of light provided by various light intensities combined with different photoperiods on the growth and morphogenesis of lettuce (Lactuca sativa L.) ‘Hongyeom Jeockchukmyeon’ in a closed-type plant factory system were evaluated in this study. Four light intensity treatments, i.e., 200, 230, 260, and 290 µmol·m-2·s-1 PPFD, provided from light-emitting diodes (LEDs), with a combination of three different photoperiods 18/6 (1 cycle), 9/3 (2 cycles)or 6/2 (3 cycles) (light/dark) were used. The combination of 290-9/3 (light intensity-photoperiod) showed the highest plant height and fresh shoot weight, while plants grown at 290-18/6 exhibited the greatest root fresh weight, leaf dry weight, and longest root length. The greatest leaf width, maximum number of leaves, and greatest root dry weight were observed in the treatment combination of 290-6/2. Anthocyanin content was found to be highest in the 290-6/2and lowest in the 200-6/2 treatment, whereas chlorophyll fluorescence was observed to be highest in the 260-6/2 and the lowest in the 290-9/3 treatment. Our data showed that providing a high light intensity of 290 µmol·m-2·s-1 PPFD with a shorter photoperiod of 6/2 (light/dark) resulted in good plant growth and development of lettuce, whereas growth at light intensities of 230 or 260 µmol·m-2·s-1 PPFD with longer photoperiods of 18/6 and 9/3 (light/dark)resulted in good growth as well as higher photosynthetic capacity.