• Journal of the Korea institute for structural maintenance and inspection
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• v.9 no.2
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• pp.225-235
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• 2005

The stability of innovative prestressed wale system applied in urban excavation was investigated. The IPS is a wale system prestressed by tension of steel wires. The IPS consists of steel wires, H-beam support and wale. The IPS provides a high flexural stiffness to resist the bending moment caused by earth pressures. And the IPS transmits earth pressures due to excavation to corner struts. The IPS provides a larger spacing of support, economical benefit, construction easiness, good performance and safety control. This paper explains basic concept and mechanism of the IPS and presents the measured performances of the IPS applied in urban excavation. In order to investigate applicability and stability of the IPS in urban excavation, observations and measurements in site were performed. The IPS applied in urban excavation was performed successfully. The results of the field instrumentation were presented. The measured performances of the IPS were investigated. And behavior of the wall and corner struts was investigated.

• Journal of the Korean GEO-environmental Society
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• v.13 no.5
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• pp.25-33
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• 2012

In this study, gathered measuring data at fields constructed by IPS(Innovative Prestressed Support) system controls the ground displacement and improves the constructability of earth work and structure work greatly, and compared with horizontal displacement calculated by Elasto-plastic analysis program(EXCAV/W). As the result, displacement of calculated by pre-loading data is reduced 13.2% average of general method, and measuring displacement is also reduced 26.7% average of general method. Therefore that IPS system is more safe than conventional strut method in contrast to displacement of underground wall. In addition, horizontal displacement is reduced through the pre-loading effect used by IPS system.

• Proceedings of the Korean Geotechical Society Conference
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• 2004.03b
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• pp.293-300
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• 2004

A new earth retention system(Innovative Prestressed Wale System) has been developed and introduced. IPR earth retention system provides an economical benefit, construction easiness, good performance and safety. IPS is a prestressed wale by using a steel wire, which provides a high stiffness to resist the earth pressure. In order to investigate the applicability and the safety of new IPS system, field tests were performed. A new IPS system applied in a trench excavation performed successfully. Basic principles and mechanism of IPS system and measure performance were presented and discussed.

• Journal of the Korean Geotechnical Society
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• v.23 no.3
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• pp.5-13
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• 2007

The performance of innovative prestressed support (IPS) earth retention system applied in soft clay was investigated and presented. The IPS wale system provides a high flexural stiffness to resist the bending by lateral earth pressure, and transfers lateral earth pressure to strut supports. The IPS wale system provides a larger spacing of support than conventional braced and anchored systems. The IPS earth retention system was selected for temporary earth support in a building construction in North Busan area. The excavation was made 28.8 m wide, 52.0 m long, and 16.1 m deep through loose fill to soft clay. The IPS system consists of 650 mm thick slurry walls, and five levels of IPS wales and struts. Field monitoring data were collected including wall deflections at six locations, ground water levels at four locations, IPS wale deflections at thirty locations, and axial loads on struts at twenty locations, during construction. The IPS earth retention system applied in soft clay performed successfully within a designed criterion. Field measurements were compared with design assumptions of the IPS earth retention system. The applicability and stability of the IPS earth retention system in soft clay were investigated and evaluated.

• Proceedings of the Korean Society Of Semiconductor Equipment Technology
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• 2003.05a
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• pp.12-17
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• 2003

본 연구에서는 MICP Etching system 을 이용한 Via contact 및 Deep contact hole etch process 특성을 연구하였다. Langmuir probe 를 이용한 MICP source 의 Plasma density & electron temperature 측정하였고 탄소와 플로우르를 포함하는 혼합 Plasma 를 형성하여 RF frequency, wall temperature, chamber gap, gas chemistry 등의 변화에 따른 식각 특성을 조사하였다. Plasma density 는 1000w 에서 $10^{11}$/$cm^3$ 이상의 high density plasma와 uniform plasma 형성을 확인하였고 $CH_{2}F_{2}$와 CO의 적절한 혼합비를 이용하여 Oxide to PR 선택비가 10 이상인 고선택비 조건을 확보하였다. 고선택비 형성에 따라 Polymer 형성이 많이 되었고 이를 개선하기 위하여 반응 챔버의 온도 조절을 통하여 Polymer 증착 방지에 효과적인 것을 확인하였다. MICP source를 이용하여 탄소와 플로우르의 혼합 가스와 식각 챔버의 온도 조절에 의한 선택비 증가를 확보하여 High Aspect Ratio Contact Hole Etch 가능성을 확보하였다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.33 no.2
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• pp.179-184
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• 2009

The Fuel Test Loop(FTL) which is capable of an irradiation testing under a similar operating condition to those of PWR(Pressurized Water Reactor) and CANDU(CANadian Deuterium Uranium reactor) nuclear power plants has been developed and installed in HANARO, KAERI(Korea Atomic Energy Research Institute). It consists of In-Pile Section(IPS) and Out-of Pile System(OPS). The IPS, which is located inside the pool is divided into 3-parts; the in-pool pipes, the IVA(IPS Vessel Assembly) and the support structures. The test fuel is loaded inside a double wall, inner pressure vessel and outer pressure vessel, to keep the functionality of the reactor coolant pressure boundary. The IVA is manufactured by local company and the functional test and verification were done through pressure drop, vibration, hydraulic and leakage tests. The brazing technique for the instrument lines has been checked for its functionality and performance. An IVA has been manufactured by local technique and have finally tested under high temperature and high pressure. The IVA and piping did not experience leakage, as we have checked the piping, flanges, assembly parts. We have obtained good data during the three cycle test which includes a pressure test, pressure and temperature cycling, and constant temperature.

• KSBB Journal
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• v.25 no.2
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• pp.155-166
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• 2010

Studies on the production of cell-wall bound innerpolysaccharides (IPS) (soluble ${\beta}$-D-glucan) have been performed by use of suspended myelial cultures of Inonotus obliquus. This product has promising potentials as an effective antidiabetic as well as an immunostimulating agents. As a first step to enhanced production of IPS, Intensive strain improvement programs were carried out by obtaining a large amounts of protoplasts for the isolation of single cell colonies. Rapid and large screening of high-yielding producers was possible because about fivefold higher amount of protoplasts ($2.3{\times}10^6$ protoplasts/mL) could be recovered with relatively high regeneration rates of $10^{-2}{\sim}10^{-3}$ by applying a modified filtration method, as compared to the previously used trapping method. A basic protocol necessary for UV-mutation of the protoplasts was also developed, resulting in several overproducing variants with good fermentation properties. Since the amount of IPS extracted from the mycelial cell walls of I. obliquus turned out to be almost constant per g DCW, increase in cell mass was considered the most important factor for the enhancement in IPS production. Therefore, attempts were made to screen mutant cells showing rapid mycelial growth rate in the final suspended cultures. Notably, the mutant strains showing an active cellgrowth in the preceding solid growth cultures were observed to produce higher amount of IPS in the suspended fermentations as well. A striking mutant, OBLQ756-15-5 strain, obtained from the survivors of a harsh UV-treated condition (97% death rate) was found to stably produce as high cell mass as 22 g DCW/L in the final fermentations. Currently, this strain is being tested for development of a scaled-up fermentation process for mass production of IPS.

• Journal of the Korean GEO-environmental Society
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• v.11 no.11
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• pp.37-45
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• 2010

In this study, the value of numerical analysis was compared to the measured value of horizontal displacement during construction. And also, the value was reviewed by comparing with numbers calculated by SUNEX program and EXCAV program. When comparing to suggested values of the maximum horizontal displacement in clayey layer, the displacement caused by the IPS system is larger than one by the Strut girder type system. When comparing the result of SUNEX program to that of EXCAV program, the SUNEX program interprets larger value. It could be concluded the result of SUNEX program is closer to the suggested value, 0.5%H, in clayey layer. The result also shows that the internal friction angle(${\Phi}$) is the key factor of developing horizontal displacement rather than type of supporting systems or materials. That means small horizontal displacement occurs in sandy layer having large value of the internal friction angle, whereas vice versa in clayey layer having small value of the internal friction angle. Therefore, the result of EXCAV program is larger in sandy layer and vice versa in clayey layer. When comparing the measured result during construction to the value of 0.5%H, the measured result is 1.4 times greater than the value of 0.5%H. In contrast, the result of SUNEX program is only 78.1% of the value of 0.5%H and the one of EXCAV program is just 18.1% of that. This result shows the calculated value by SUNEX or EXCAV program is smaller than the observed value by measuring during construction. In result, more careful attention is needed to determine the behavior of the ground. To better analyze the behavior of the ground, more precise finite element method is required.