• 청정기술
• /
• 제16권1호
• /
• pp.64-70
• /
• 2010

본 연구에서는 상용 폴리실리콘 제조공정 중 삼염화실란 정제공정에 사용되는 증류탑에 대해 분리벽형 증류탑을 적용하는 방안을 제안하였다. 상용 전산모사 프로그램(HYSYS)을 통해 기존의 단순 증류탑을 사용한 정제공정과 분리벽형 증류탑으로 대체한 공정을 각각 전산모사 하여 같은 순도와 수율로 삼염화실리콘을 정제할 때 증류탑에서 소모되는 에너지와 투자비용 효과를 비교 분석하였다. 그 결과, 분리벽형 증류탑을 적용한 정제공정이 기존 정제공정에 비해 약 61%의 에너지 절감 효과와 58%의 투자비용 절감효과를 가지는 것으로 확인되었다.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
• /
• pp.309-309
• /
• 2000

The main objective of this study is to understand the regeneration step of the PTSA(Pressure and thermal swing adsorption) process below the atmospheric pressure by rigorous dynamic simulation. This target process is to recover toluene using activated carbon as an adsorbent. To do this, the dynamic simulations for the regeneration step are performed at 360, 490, 590mmHg and at high temperature after the simulation of the adsorption step at latm and 298K. A mathematical model was developed to simulate the column dynamics of the adsorption systems. This model is based on non-equilibrium, non-isothermal and non-adiabatic conditions, and axial dispersion and heat conduction are also considered. Heat transfer resistances are considered in gas-solid, gas-column wall and column wall-outside air. The LDF(Linear Driving Force) approximation model describes the mass transfer rate between the gas and solid phase. This study shows that the recovery of toluene by PTSA is more preferable than that by general TSA.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2000년도 가을 학술발표회 논문집(II)
• /
• pp.851-856
• /
• 2000

When subjected to the strong earthquake ground motion, upper-wall lower-frame structures have high possibility of the weak-story failure in the lower frame part. Sufficient strength, energy dissipation capacity and ductility should be provided at the joint between the deep beam and the lower column. In this study, a typical structure was selected for a prototype and four 1:2.5 scaled models, representing the subassemblage including the exterior column and the deep beam, were constructed. The transverse reinforcement was designed according to ACI procedure¹ and the procedure proposed by Sheikh². The inelastic behavior of the subassemblages subjected to the cyclic lateral displacement were evaluated through investigation of the ultimate strength, ductility, load-deformation characteristics. From the test of 4 specimens, it is concluded that the specimens designed according to Sheikh's procedure revealed higher ductility than that by ACI procedure.

• 한국안전학회지
• /
• 제16권3호
• /
• pp.89-98
• /
• 2001

There have been a lot of studies about repair & strengthening of the concrete structure. But there has almost not been my study on section damage effect due to holes drilled out for installing additional facilities or equipment, such as rack on the wall of building or underground culvert system, plumbing system through the column or wall of it, after being occupied. This study is to find out how much the section loss due to holes will give loss of section strength. We cm determine if we repair or reinforce it completely or not, using strength loss from the hole. Hole size of diameter 3cm, 2cm, lcm, depth of 3cm, 5cm, 10cm, and position of each hole has been considered as variables of this study. It is concluded that section loss 30% results in 53% of strength damage.

• 한국조명전기설비학회지:조명전기설비
• /
• 제2권2호
• /
• pp.55-58
• /
• 1988

관벽온도에 따른 형광램프 양광주 내의 전자이동도 변화를 계산하였다. 전자분포 함수는 2 Electron Group Model을 사용하였다. 또한 이를 검증하기 위하여, 38mm 20W 형광램프 양광주 내의 전자이동도를 관벽온도를 변화시키면서 측정하였다. 측정방법으로는 양광주 내의 전계를 구하기 위하여 양극 및 음극 강하전압의 합을 15V로 가정하였으며 2중 슬릿을 사용하여 양광주의 길이를 측정하였다. 관벽온도를 $10-18^{\circ}C$로 변화시키며 계산하고 측정한 결과를 표시하였다.

• 한국포장학회지
• /
• 제10권1호
• /
• pp.47-54
• /
• 2004

Normally, the single wall(SW) corrugated board has more advantages than double wall (DW) corrugated board in terms of the cost of the materials and logistics. For instance, the SW corrugated board has 3 layer papers whereas the DW corrugated board has 5 layer papers. The thickness of the SW is about 5mm, but that of the DW is 8mm. Accordingly, the SW corrugated board is quite more used in the developed countries than the DW corrugated board. But in Korea, the DW corrugated board is quite more used. The reason why more DW corrugated board are used than the SW corrugated in Korea is that in order that the SW corrugated board has the same box compression strength as DW corrugated board, the cost of the SW corrugated board is higher than that of the DW corrugated board because the virgin kraft liners are all imported from overseas. In this study, the physical properties such as flat crush strength and column crush strength of typical SW corrugated board and single wall dual-layer medium corrugated board and their costs were analyzed. The analysis resulted in that single wall dual-layer medium corrugated board has the same thickness as the SW corrugated board but the more flat crush strength and column crush strength and the less cost than the SW corrugated board.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2009년도 춘계 학술대회 제21권1호
• /
• pp.73-74
• /
• 2009

기존 건축물에는 용도상 복잡한 형상의 기둥에 벽이 붙는 경우가 많으며 대표적인 것으로 날개벽이 있다. 날개벽이 붙는 기둥 및 비내력벽체가 날개벽화가 되면 강성이 크나 연성이 줄어드는 등 부재의 전반적인 거동에 영향을 주는 경우가 많다. 이런 부재 모두는 대변형시 전단파괴의 가능성이 있으며 내력열화가 발생하기 쉽다. 기존 건축물의 내진 성능평가 시 연직부재의 전단내력과 휨 내력의 산정은 가장 중요한 사항으로 간주하여 설계되고 있으나, 현재까지 국내에서는 날개벽이 있는 기둥이 구조물의 거동에 미치는 영향에 대해서는 연구가 미흡한 실정이다. 따라서 본 연구에서는 날개벽 있는 기둥의 기초적인 연구를 목적으로 구조적 거동특성에 관한 실험을 수행하였다.

• 한국전산구조공학회:학술대회논문집
• /
• 한국전산구조공학회 2006년도 정기 학술대회 논문집
• /
• pp.865-872
• /
• 2006

Recently, many apartment buildings in the shear wall system often has pilotis in the lower story to meet the architectural needs. If the lateral force resisting system consists of shear walls supported by columns and beams. the discontinuity at the lowest level with pilotis results in the vertical irregularity with strength and stiffness. So, there are needs to be considered tile analysis and design about column and beam bellow shear walls and the behavior and stress condition of structure by stiffness change being generated at shear walls. The purpose of this paper is to investigate the behavior of shear wall structures with pilotis using the floors modeled as rigid diaphragm or semi rigid diaphragm. Through analyses, after estimating values of the story drift, natural period, stress condition of shear walls and the forces of column, we inferred how the behavior of shear wall structures with pilotis was influenced by the floor stiffness.

• Earthquakes and Structures
• /
• 제18권3호
• /
• pp.379-390
• /
• 2020

Four full-scaled partially confined and unconfined masonry panels were tested with monotonic lateral loads. To study the effects of vertical force and boundary columns, two specimens with no boundary columns were subjected to different vertical forces, while two wing-wall specimens had the column placed eccentrically and in the middle, respectively. The specimens with no boundary columns exhibited ductile rocking behavior, where the lateral strength increased with increasing vertical compression. The wing-wall specimens with columns behaved as strut-and-tie systems. The column-panel interaction resulted in greater strength, lower deformation capacity and differences in failure modes. A comparison with analytical models showed that rocking strength can be accurately estimated using vertical force and the panel aspect ratio for panels with no boundary columns. The estimation for lateral strength on the basis of a panel section area indicated scattered error for wing-wall specimens.

• 대한화학회지
• /
• 제22권5호
• /
• pp.340-355
• /
• 1978

化學反應 수반하는 氣體吸着反應器의 設計에 가장 重要한 氣液界面間의 物質傳達係數와 面積을 測定하는데 자주 모델反應이 利用된다. 本硏究는 그 中에서 wetted wall column 에 sulfite-system을 dldydgkdu 特別히 氣液間의 接觸時間이 氣體吸着速道에 미치는 영향을 硏究 檢討하였다. 反應速道가 매우 빠르거나 늦으면 column의 길이에 따라서, 다시 말하면 接觸時間에 따라서 氣體吸着速道에 差異가 크다는 것을 發見했다. 反應速道恒數 $k_2=5.5{\times}10^6m^3/kmol{\cdot}s$ 近處에서는 이 差異가 없어진다. 換言하면 이런 條件下에서 裝置의 hydrodynamics가 氣體吸着速道에 無關해진다. 金屬 column 代身에 graphite column을 使用할 수 있다는 例證을 題示하였다.