• Proceedings of the KAIS Fall Conference
• /
• 2008.05a
• /
• pp.309-312
• /
• 2008

We have prepared the silicone sealant using non silicone oil without silicone oil for solvent and using adhesion promotor against various substrate. We are replaced the silicone oil by the mineral oil and the normal adhesion promotor by mixed adhesion promotor at the multi purpose silicone sealant.

• Journal of the Korean earth science society
• /
• v.28 no.7
• /
• pp.762-774
• /
• 2007

The purpose of this study was to investigate misconceptions about plate tectonics which spread widely among freshmen at high school with drawing. For this, we chose 6 conceptions about plate tectonics by analysis of 7th curriculum and of 11 kinds of science textbooks. Questionnaire of drawing about plate tectonics were developed depending on them. Data was collected from 134 students who was freshmen at high school in Daegu. The result of this study was as follows. First, In structure of plate, 'upper mantle type' and 'crust type' misconceptions were more than half of the respondents. Second, In distribution of plate, 'cracked earthquake zone type' and 'earthquake frequency type' misconceptions were more than half of the respondents. Third, In formation of ocean ridge at oceanic crust- oceanic crust divergent plate boundary, 'divergence type' and 'collision type' misconceptions were more than half of the respondents. Fourth, In formation of mountain ridge at continental crust- continental crust convergent plate boundary, 'collision type' misconceptions were more than half of the respondents. Fifih, In formation of mountain ridge at oceanic crust- continental crust convergent plate boundary, 'subduction type' and 'fault type' misconceptions were more than half of the respondents. Sixth, In transform-fault at oceanic crust- oceanic crust transform-fault boundary, 'direction type' and 'section type' misconceptions were almost half of the respondents. In this study, students' drawings about plate tectonics showed similar misconceptions. This imply that drawing conceptions can be used by the strong evidence of misconceptions which spread widely among students. Furthermore, this study has a significance that this conclusion is useful to teachers as basic teaching-teaming materials of plate tectonics.

• Journal of the korean Society of Automotive Engineers
• /
• v.13 no.4
• /
• pp.18-25
• /
• 1991

디젤엔진에서 윤활오일의 소모량이 점진적으로 증가하는 것은 비정상적인 시린더 마모 때문이다. 시린더 라이너의 작동기구를 L-link 피스톤운동 측정장치로 조사하여 피스톤 top-land의 탄소분 축적이 비정상시린더 마모의 주요 원인임이 증명되었다. 또 피스톤 top-land의 축소는 마모 방지의 유용한 방법인 것으로 이론과 실제에서 입증되었다. 오일 소모와 시린더 마모에 영향을 미치는 다른 요소들에 관해서도 살펴보았다.

• Tribology and Lubricants
• /
• v.6 no.1
• /
• pp.24-35
• /
• 1990

엔진 오일 첨가제는 오일 전체의 성질에 영향을 주는 것과 윤활 부품의 표면성질에 영향을 미치는 것으로 구분할 수 있다. 표면 작용용 첨가제들의 상호작용은 기대 이하의 성능을 발휘하는 경우가 있고, 그 원인은 첨가제의 상호작용에 의한 것으로 볼 수 있으므로 가능한 범위내에서 실험적으로 살펴보기로 한다.

• 대한방사선방어학회:학술대회논문집
• /
• 2011.04a
• /
• pp.52-53
• /
• 2011

• Korea lubricating oil industries association bulletin
• /
• no.92
• /
• pp.34-35
• /
• 1999

• Journal of Veterinary Clinics
• /
• v.31 no.3
• /
• pp.180-193
• /
• 2014

Allergic contact dermatitis (ACD) is an inflammatory skin disease and regarded as a prototype of T-cell mediated delayed-type hypersensitivity reactions. Aroma Oil Complex (AOC) is composed of lavender true oil, chamomile roman oil and tea tree oil. This study was performed to assess the effects of AOC in a canine model of ACD. ACD was induced on the back of dogs induced by sensitization and repeated application by 2,4-dinitro-1-chlorobenzene (DNCB). Topical treatment of AOC was applied once a day for 8 days and skin biophysical parameters including transepidermal water loss (TEWL), skin hydration, skin thickness and erythema index, were measured every two days during experimental periods. Histopathology and immunohistochemistry were performed to evaluate the anti-inflammatory effect. In skin biophysical parameters, TEWL, skin hydration, skin thickness and erythema index were significantly increased, with a maximum increase appeared on day 2 (p<0.05). After the completion of AOC treatment, skin biophysical parameters were significantly reached those of baseline in a time-dependent manner (p<0.05). In histopathology, marked increases of epidermal thicknesses were induced after DNCB challenge with numerous inflammatory cell infiltrations and edematous changes, decreases of connective tissue occupied regions in dermis. In addition, marked increases of cytokine - tumor necrosis factor-${\alpha}$ (TNF-${\alpha}$) and interferon-${\gamma}$ (IFN-${\gamma}$)-immunoreactivities in the dermis and of apoptotic markers - caspase-3 and PARP-immunoreactivities in the epidermis were observed in DNCB control as compared with intact control, respectively (p<0.01). The decrease of infiltrated inflammatory cells and related decreases of pro-inflammatory cytokine immunoreactivities were observed in AOC treated skin (p<0.01). Based on these findings, AOC may have anti-inflammatory and alleviatory effects in the allergic contact dermatitis.

• Journal of the Korean Institute of Gas
• /
• v.22 no.4
• /
• pp.39-48
• /
• 2018

This study presents optimal design of gas lift considering composition of reservoir oil and injected gas which can affect gas lift performance in offshore oil reservoir. Reservoir simulation was conducted by using reservoir models which were built in accordance with API gravity of oil. The results of simulation reveal that oil production rate is considerably increased by gas lift when the reservoir productivity decrease. As a results of response curve analysis for gas lift using well models, gas injection rate to improve the production rate increases as the API gravity of oil decreases and the specific gravity of injected gas increases. The optimal design of gas lift was carried out using multiple lift valves. Consequently, gas lift can be operated at relatively low injection pressure because of decrease in injection depth in comparison to the single lift valve design. The improved oil production rates were analyzed by coupling between reservoir model and well model. As a results of the coupling, it is expected that natural gas injection in the heavy oil reservoir is the most efficient method for improving oil production by gas lift.

• Journal of Cadastre & Land InformatiX
• /
• v.47 no.2
• /
• pp.159-174
• /
• 2017

The long-term imbalances between supply and demand in office market can weaken urban growth since excessive supply of offices led to office market instability and excessive demand of offices weakens growth of urban industry. Recently, there have been a lot of new large-scale supplies, which increased volatility in Seoul office market. Nevertheless, new supply of Seoul office has not been fully examined. Given this, the focus of this article was on confirming the influences of profitability, replacement cost, and demand on new office supplies in Seoul. In examining those influences, another focus was on their relative influences over time. For these purposes, we analyzed quarterly data of Seoul office market between 2003 and 2015 using a vector error correction model (VECM). As a result, in terms of the influences on the current new supply, the impact of supply before the first quarter was negative, while that of office employment before the first quarter was positive. Also, that of interest rate before the second quarter was positive, while those of cap rate before the first quarter and cap rate before the second quarter were negative. Based on the findings, it is suggested that prediction models on Seoul offices need to be developed considering the influences of profitability, replacement cost, and demand on new office supplies in Seoul.

• Korean Journal of Medicinal Crop Science
• /
• v.9 no.3
• /
• pp.186-191
• /
• 2001

This study was conducted to find the flowering and seed setting characteristics of Eleutherococcus spp. Plants of Eleutherococcus spp. were 7 years old trees reproducted by cutting method using seven species in Gongju. Initial flowering date was foremost by May 9 in E. sieboldianus and hindmost by August 23 in E. divaricatus among seven species. Flowering duration was most short by 20 days in E. sieboldianus and extremely long by 42 days in E. sieboldianus. Number of flowers per plant in E. sieboldianus and E. chilsanensis were higher by 4677 and 4634 than those in E. divaricatus and E. sieboldianus by 780, 84, respectively. The fruit setting percent was the highest in E. sieboldianus by 95% and numbers of fruit setting per cluster showed the highest value by 153 in E. sieboldianus. The seed setting percent was almost same by ${92{\sim}95%}$ in E. sessiliflorus, E. chiisanensis, E. koreanus, E. divaricatus and E. seoulensis, but lower by ${11{\sim}37%}$ in E. senticosus and E. sieboldianus. The dry weight per plant and 100-fruit weight showed the highest value by 270g, 6.7g in E. sessiliflorus, respectively.