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Benzene에 의해 오염된 물의 鹽素處理에 의한 鹽素化合物의 生成에 關한 硏究
신현진,최고열,장향동 서울産業大學校 1996 논문집 Vol.44 No.1
This paper describes the production of the second pollution materials possibly produced during the water purification of water contaminated by various inorganic compounds. The effect of the reaction conditions such as the concentration of benzene and remaining chloride, temperature, pH as well as the addition of heavy metal on the production of chlorobenzenes has been investigated. It was confirmed from the results of quantitative and qualitative analyses of products that mono- and dichlorobenzenes, which smelled offensively and were harmful to human body, were created by chlorination of benzene containing water. The production of chlorobenzene was always observed when the concentration of benzene and remaining chloride was higher than 0.1 mg/ℓand 1 mg/ℓ, respectively. The amount of chlorobenzene increased with the reaction temperature and the concentration of reactants. The production of dichlorobenzene was largely dependent on the reaction temperature and the pH of reactant. When the pH of reactant was 2, an appreciable amount of 1.4-dichlorobenzene was produced. However, it decreased rapidly with the pH of reactant and completely disappeared at pH 4. There was no chlorobenzene produced at higher than pH 10. The concentration of chlorobenzene increased by the addition of Al and Fe.
고차구조 변화에 따른 저밀도폴리에틸렌 박막의 전기적 특성
신종열,신현택,이수원,홍진웅 한국산업안전학회 2002 한국안전학회지 Vol.17 No.4
The electrical properties of polyethylene are changed by the superstructure. Such crystalline polymer as polyethylene or polypropylene changes crystallinity and products spherulite or trans-crystal when it is cooled slowly. In this study, after thermal treatment of LDPE at 100[℃], in silicone oil for an hour, we made specimens in order of slow cooling, water cooling, quenching according to cooling speed. Also, to study the influence of electrical properties due to the superstructure change, we analyzed physical properties and performed dielectric breakdown experiments using DC and impulse voltage. Moreover we measured space charges in bulk using Laser Induced Pressure Pulse(LIPP)method. Trap level of specimen is 0.064[eV] at the low temperature region, 0.31[eV] at the high temperature region in DC dielectric strength, 0.03[eV] at the low temperature region 0.0925[eV] at the high temperature region in impulse dielectric strength. As its result shows that the quantity of charges induced from the electrode surface increases with applied voltage time, and the distribution of space charges in samples increases the quantity of charges in proportion to applied voltage.
배태웅,文炳周,辛元敎,宋模烈,李鉉旭,曺東進 東亞大學校生命資源科學大學附設 農業資原硏究所 1996 農業生命資援硏究 Vol.5 No.1
팽이 재배에 있어 가장 큰 문제 중의 하나는 雜菌에 대한 汚染, 특히 細菌에 의한 피해가 극심하므로 作業段階와 栽培過程 전반에 걸쳐 培地徵生物相의 經時的인 密度變化에 따른 雜菌의 培地內 流入時期를 조사하여 汚染菌의 發生消長을 알아보기 위해 現地農家에서 시험해 본 결과 接種후 培養室에서 菌絲培養을 시작한 5일후부터 細菌이 檢出되기 시작하여 菌긁기전까지 약 25일간 0.5∼3.1×10⁴cfu/g의 密度를 보였으나 經時的인 密度增加는 없었고, 菌絲培養이 끝난 뒤 菌긁기직후부터 細菌의 密度는 118.3×10⁴cfu/g으로 급격히 높아졌으며 子實體生育 기간동안에 시간이 경과함에 따라 密度가 현저하게 증가되는 경향을 나타냈다. 이는 培養室 안으로 흐르는 空氣를 통하여 甁內로 細菌이 流入되고 또한 菌긁기 직후 培地表面에 灌注하는 물과 加濕機에서 噴霧되는 물粒子가 細菌의 密度增加에 절대적으로 영향을 미치는 것으로 판단되므로 이때가 細菌性褐斑病菌에 感染되기 가장 용이한 시기로 생각된다. 眞菌은 菌긁기후 子實體生育 기간동안 1.17∼7.87×10⁴/g의 密度로서 菌絲培養 기간동안의 密度보다 다소 높게 檢出되었으나 대체로 經時的인 密度增加는 보이지 않았으며, 放線菌은 거의 검출되지 않거나 菌絲培養 후 5일째부터 다소 검출되기 시작했으나 밀도가 매우 낮았고 經時的으로도 증가되지 않았다. One of the most serious problem on the Enoki mushroom cultivation is the infection by pathogenicitic microorganisns, especially bacterial diseases causing serious economical losses in the mushroom production. It was carried out to find the tendency of the development of mushroom diseases by temporal changes and variation of the densities of media microflora through the cultivation periods and working stages in a mushroom farm. According to the results, several bacteria were detected from the fifth day after the inoculation and incubation of mycelium in the incubation room, and the density of bacterium was 0.5∼3.1×10⁴cfu/g media for 25 days before the inoculum-removing, although there was no increment of the density. Since the inoculum-removing after the spawn run, the density of bacterium was rapidly increased as 118.3×10⁴cfu/g media, and was significantly increased by time during the growth period of fruitbodies. It was hypothesized that it is the most suitable period for the pathogen infection because the bacterium might be introduced by the air in the incubation-room, and the increment of bacterium density might be affected by moisture supplied through watering or humidifier in the growing room after the inoculum-removing. Fungi were detected as the density as 1.17∼7.87×10⁴/g media and the density was slightly higher than that during the incubation period of hyphae, although there was no significant increment. Generally, the density of Actinomycetes was disregardfully low, or Actinomycetes were hardly ever found, although there was found some 5 days after incubation hyphae in few cases.
광도와 온도가 가시광선 중합형 치과용 레진의 중합에 주는 영향
이종근,최주열,임범순,신현철 大韓齒科器材學會 2004 대한치과재료학회지 Vol.31 No.4
본 연구에서는 2종의 다이메타크릴레이트 치과용 레진 (urethane dimethacylate, UDMA와 bisphenol A glycerolate dimethacylate, Bis-GMA)이 광중합 반응하는 과정에서 변화되는 물성을 동역학분석법 (dynamic mechanical analysis, DMA)으로 관찰하였다. 광중합에 사용한 가시광선 (λ=400-500 nm)의 광도는 20 mW/㎠에서 70, 120, 300 및 600 mW/㎠로 변화시켜 그에 따른 저장탄성율 (storage modulus, G')과 손실탄성율 (loss modulus, G")의 변화를 측정하였고, 측정온도도 25 ℃에서 37, 50 및 60 ℃로 변화시켜 온도가 중합과정에 주는 영향을 관찰하였다. 광조사 시간은 모든 시편에 대하여 측정 시작 직후 30초로 일정하게 하였다. 각 조건에서 측정한 G' 과 tan δ (=G"/G') 결과를 이용하여 겔화 (gelation)와 유리화 (vitrification) 전이시점 (transition point)을 결정하였으며, 이를 이용하여 TTIT (Time-Temperature-Intensity-Transformation) 중합 도표를 작성하였다. 이 중합도표를 보면 광도 변화가 온도 변화보다 중합반응에 더 민감하게 영향을 주었으며, 특히 광도는 겔화보다 유리화에 훨씬 크게 영향을 주는 것을 알 수 있었다.
Influence of conditions of first preterm birth on subsequent pregnancy
박수현 ( Su Hyun Park ),( Jae Hyug Yang ),( Hyun Mee Ryu ),( Moon Young Kim ),( Jung Yeol Han ),( Hyun Kyong Ahn ),( Joo Oh Kim ),( Joong Sik Shin ),( June Seek Choi ),( Jin Hoon Chung ),( Ha Jung Lim ) 대한산부인과학회 2004 대한산부인과학회 학술대회 Vol.90 No.-
The influence of monochorionicity on the perinatal outcomes in spontaneously conceived twins
신중식 ( Joong Sik Shin ),( Jae Hyug Yang ),( Hyun Mee Ryu ),( Moon Young Kim ),( Jung Yeol Han ),( Hyun Kyong Ahn ),( Jin Hoon Chung ),( Ha Jung Lim ),( June Seek Choi ),( Joo Oh Kim ),( Su Hyun Park ) 대한산부인과학회 2004 대한산부인과학회 학술대회 Vol.90 No.-