• Journal of the Korean Society of Safety
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• v.23 no.4
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• pp.79-84
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• 2008

Auto injector grouting method as low pressure injected by using epoxy and Boyle's law is very excellent method in economical efficiency and construction work because injected process can be dealt with collectively. For estimation of filling capacity purpose of this study compared the Auto injector method with the piston injector method. In this study, the tests allow for width of crack, injected angle of epoxy resin and injected method were performed using concrete block specimen making artificial crack. The results of test, tilling et1iciency of epoxy by Auto Injector grouting method verify to better than the piston injector method and uniaxial strength increased about 11% than standard specimen.

• Proceedings of the KIEE Conference
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• 2006.10c
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• pp.309-311
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• 2006

A train having a system which tilts the train body to reduce the lateral acceleration experienced by passengers when operating around curves, allowing the train to run at higher speeds through curves than non-tilting trains. A tilting train may have a maximum design service cant deficiency of up to $8^{\circ}$. In this case there is, at worst, a margin of only $6^{\circ}$ cant deficiency between a train travelling at enhanced permissible speed and its roll-over resistance. This is a significant reduction in the margin against overturning compared to that offered at permissible speeds. Particular consideration therefore needs to be given to the adequacy of the margin and the additional controls against overturning required when trains travel at enhanced permissible speeds. This paper deals with the speed supervision system of tilting train through curves.

• Proceedings of the KSR Conference
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• 2004.06a
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• pp.744-747
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• 2004

This paper presents a strength evaluation of a tilling bogie frame for the Korean tilting train, The tilting bogies of the tilting train are subjected to different loading conditions compared with the bogie of the conventional railway vehicles because of the carboloy tilting on curves. We classified the load cases as two categories such as non-tilting case and tilting case. For the two categories. we have carried out structural analysis of the bogie frame to evaluate the strength of the frame. And then, we modified the shape and thickness for the weak areas of the bogie frame to ensure structural safety.

• 한국생물공학회:학술대회논문집
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• 2004.07a
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• pp.107-125
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• 2004

A bioremediation of petroleum-contaminated soil in Korea was evaluated for the optimization of enhanced biodegradation and the minimization of effects of seasonal variations, The short-term bioremediation in combination of biopile pretreatment and landfarming was performed by lowering contaminated levels and overcoming the inhibiting factors in the rainy and winter seasons. A microbial density was maintained with indigenous microbial addition for bioaugmentation and with fertilizers for biostimulation. A lesser volatile and biodegradable fraction due to their abiotic removals following the biopile pretreatment was effectively removed by the laterally applied landfarming. The optimal temperature in greenhouse was maintained by buffering of the soil temperature even with slight decreases in removal rates during the winter and extensive leaching of nutrients and contaminants was restricted with adjusting the water contents during the Korean rainy season. Although the tilling process was effective for biodegradation with aeration only, the simultaneous treatment due to apparent mixing of nutrients and microbes more favorably degraded the petroleum than the sequential treatment.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2002.07a
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• pp.15-20
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• 2002

우리나라 농용트랙터 농가 보급률은 2000년 현재 13.9%로 약 19만대 정도이며 연간 약 2만대 정도의 농용트랙터가 보급되고 있다 농작업 중 동력이 가장 크게 소요되는 경운작업은 1차 경기작업과 2차 쇄토작업으로 크게 나눌 수 있는데, 근래에는 이것을 동시 작업 화하여 작업시간과 에너지 및 경비를 절감할 수 있는 로타리 경운 작업만 실시하는 경향으로 발전하고 있다. (중략)

• Proceedings of the Korean Society of Crop Science Conference
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• 2007.11a
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• pp.228.1-228.1
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• 2007

• Proceedings of the KSR Conference
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• 2009.05a
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• pp.1224-1228
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• 2009

The korean tilting train can increase the whole operating speed at a curved railroad, reducing the lateral acceleration with the tilting mechanism unlike the train developed before. However, increasing operating speed on the curved section, may cause safety problem of train travel. In general, a suspension system has important effects on driving safety. Therefore, optimization of suspension system is necessary to secure the safety of the tilting train. In this study, the tilting train suspension system has been optimized using Design of Experiments (DOE). First, the design parameter is selected using sensitivity analysis. A lateral acceleration which affects on the driving safety is chosen as the objective function. And the Design of Experiments (DOE) is used for optimization. As a result, new design parameters which show better performance than the existing suspension system has been suggested.

• Journal of the Korean Society for Railway
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• v.8 no.1
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• pp.34-40
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• 2005

This study presents parametric studies for design of a tilting mechanism to be used in 180km/h tilting train. The tilling mechanism is composed of 4 links, a lilting bolster old an electro-mechanical actuator. The movements of the tiling center, CG of the train body, coupler center and tilting actuator along variation of upper and lower span length have been verified by the kinematic analysis. Moreover, the inclination angle and the stroke of the tilting actuator according to the variation of the tilting angle from +8 degrees to -8 degrees have been investigated. From this study, the relation between the movements of the CG of the train body, coupler center and tilting actuator and the height of the tilting center could be evaluated.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.17 no.2
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• pp.212-216
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• 2004

In this paper, we have fabricated a triode field emitter using carbon nanotubes (CNTs) directly grown by thermal chemical vapor deposition(CVD) method as an electron omission source. Vertically aligned CNTs have been grown in the center of the gate hole, to the size of 1.5 ${\mu}{\textrm}{m}$ in diameter, with help of a sacrificial layer of a type generally used in metal tip process. By the method of tilling the substrate, we made CNTs emitters both with and without SiO$_2$layer, a sidewall protector, deposited on sidewall of gate. After that we researched the electrical characteristics about two types of emitters. In effect, a sidewall protector can enhance the electrical characteristics by suppressing the problem of short circuits between the gate and the CNTs. The leakage current of an emitter with a sidewall protector is approximately sevenfold lower than that of an emitter without it at a gate voltage of 100 V.

• Proceedings of the KSR Conference
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• 2003.10c
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• pp.611-616
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• 2003

The application of the tilting train is one of the most efficient ways to increase curving speed of train on existing tracks or on mountain railway lines with sharp curves. It can increase the running speed and ensure the passenger comfort and safety at the same time. Therefore, the development of tilting train has been paid high attention by many countries in the world. Tilting trains have been operated successfully in many countries such as Italy, Spain, Germany, Sweden, England and so on. The tilting trains possess broad prospects in raising speeds. The distributed EMU tilting train set will be developed according to the Korea railway conditions and will be operated on the Honam line, Janghang line and Jungang line. Because there is high percentage of curves on these lines. these lines are suited to operating tilting trains to raising speed and saving passenger traveling time. In order. to improve the curving performance of the tilling train. the active-control algorithm is utilized for the tilting bogie.