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- 저자 : 한현조(Hyun Jo Han) (검색결과 2 건)
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침대 스프링 매트리스의 내구성 및 꺼짐(Dipping)특성에 미치는 영향 분석
한현조(Hyun Jo Han),김형석(Hyung Seok Kim),최준원(Jun Won Choi),강석구(Seog Goo Kang) 한국가구학회 2018 한국가구학회지 Vol.29 No.2
The right sleep environment for modern people is very important. While a person is sleeping, it relieves body and mental fatigue, replenishes energy, and strengthens mental functions and brain memory. Sound sleep means sleeping deeply, sleeping continuously and getting enough time. Bed mattress plays the most important role in environmental conditions for sound sleep. According to the survey when using bed mattress, the noise and dipping was the most abundant. The purpose of this study is to analyze the durability and dipping characteristics of spring mattresses of different kinds and to examine the factors affecting dipping. First, we reviewed the spring characteristics and internal structure of the four bed mattress types. And the durability test, the vertical load (hardness) test, the tensile strength test of the outer surface, and compression set of the internal material were performed for each type of mattress. As a result, the amount of dipping for each type was different. As the thickness of the internal material increased, the amount of dipping decreased. It was judged that the internal material plays an auxiliary role by alleviating the load and impact directly transmitted to the spring mattress. There was no difference in the tensile strength of the outer surface. And there was a slight difference in the elastic performance of the internal material of each type of spring mattress. The factors that have the greatest effect on dipping and durability will vary depending on the presence, thickness, and elastic performance of the internal material.
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반탄화 목분을 이용한 계면활성제의 흡착 및 생태독성에 관한 연구
이석언(Seok Eon Lee),오영환(Young Hwan Oh),이학주(Hak Joo Lee),한현조(Hyun Jo Han),남정빈(Jeong Bin Nam),양승민(Seung Min Yang),강석구(Seog Goo Kang) 한국펄프·종이공학회 2017 펄프.종이技術 Vol.49 No.6
The area with damaged wood by pest in Korea currently covers about 10.1 thousand hectares, which is annually increasing. In this study, an application possibility of torrefied wood flour made from those damaged wood as a water treatment agent has been examined as compared with activated carbon, the existing one. Torrefied wood flour has been manufactured out of damaged wood by pest under the condition of high heat treatment, and an experiment with surfactant on the effect of water treatment has been conducted using to the torrefied wood flour through this study. While surfactant is a major cause of water pollution, it is being used in various ways such as medicine, detergent and agricultural chemicals, which brings about many social problems. In the experiment, adsorbent was mixed with C-PAM, torrefied wood flour and activated carbon in a ratio of ten to one respectively. Also, activated carbon, a current water treatment agent, was to be used as comparative material. Biodegradability, adsorption performance according to the change of concentration, and ecotoxicity value of surfactant has been tested in this study to figure out its possibility as an adsorbent. It has been confirmed that the surfactant degraded by about 90% within 15 days. In the light of the change in concentration of surfactant, both torrefied wood flour and activated carbon have the adsorption capacity as surfactant. It appeared that the adsorption performance of torrefied wood flour was about 20% higher than that of activated carbon when its dosage condition was 2%. In addition, the TU value in ecotoxicity from the filtrate of the processed torrefied wood flour with the highest adsorption. In conclusion of the study, it has been confirmed that, based on the result of ecotoxicity value and adsorption performance of surfactant, torrefied wood flour has an application possibility as a water treatment agent which can replace activated carbon.
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