• Journal of the Korean Institute of Telematics and Electronics C
• /
• v.36C no.2
• /
• pp.46-53
• /
• 1999

In this paper, a packer is proposed for removing the bottle-neck effect and processing easy signal using a new algorithm with the operation frequency of 54MHz in processing HDTV video signal. To verify the performance of the proposed packer, DCT coefficient encoding block with ROM table using a combinational logic is designed and its output data are used as the input data of the packer.The proposed circuits, in this paper, are designed by using VHDL code and its modeling and simulation are performed with SYNOPSYS tool in $0.65{\mu}m$ design rule.

• The Journal of Engineering Geology
• /
• v.26 no.3
• /
• pp.353-360
• /
• 2016

Tests of hydraulic rock splitting were conducted using double packer at the 1, 2 free surface in the limestone mining and granodiorite Suksan area, respectively. The method of hydraulic rock splitting was applying hydraulic power in the interval layer using double packer. As a result of tests, a crack occurred. At about 6.5 MPa and 13 MPa, a crack occurred in 2 free surface. Any crack did not occur in the 1 free surface. Rather, used 1 double packer was broken in the 1 free surface. Also, it was confirmed that the water pressure of the interval increased through the existing crack and the new crack in the test areas.

• The Journal of Engineering Geology
• /
• v.10 no.1
• /
• pp.13-25
• /
• 2000

A three-dimensional discrete fracture network model based on probabilistic characteristics of fracture geometry and transmissivity was designed to calculate the conductivity tensor and to estimate theanisotropy of conductivity. The conductivities, $K_p$, obtained from the numerical simulation of single-holepacker test corresponded well to those from the field tests. From this, it can be concluded that thefracture network model designed in this study can represent hydraulic characteristics of in-situ fractured rock mass. Block-scale conductivities, $K_b$, estimated from the modelling of steady-state flow through the REV-scale block were ranged between the arithmetic mean and harmonic mean of theconductivity estimates from packer tests. The conductivity along north-south direction was 1.4 timesgreater than that along the east-west direction. It was concluded that the anisotropy of conductivitywas insignificant. It was also found that there was a little correlation between $K_b$ and $K_p$. This would be to that the conductivities from the packer test simulation was strongly dependent on thetransmissivity and the number of fractures within the packer test intervals.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.27 no.6
• /
• pp.1271-1280
• /
• 2017

The android packer service using runtime execution compression technology switches to the original application using DexClassLoader. However the API interface of the DexClassLoader receives the path of the loaded DEX(Dalvik EXcutable) and the path of the compiled file. So there is a problem that the original file is exposed to the file system. Therefore, it is not safe to use the API for the packer service. In this paper, we solve this problem by changing the compile and load flow of the DexClassLoader API. Due to this changed execution flow, the complied file can be encrypted and stored in the file system or only in the memory and it can be decrypted or substituted at the time of subsequent loading to enable the original application conversion. we expected that the stability of the packer will increase beacause the proposed method does not expose the original file to the file system.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
• /
• 2004.04a
• /
• pp.106-109
• /
• 2004

지표하부 상층 오염지하수의 침투로 인한 암반 지하수의 오염을 방지하기 위하여 지하수 개발과정에서 반드시 지표하부 지하수 오염방지를 이행하도록 지하수법에 규정하고 있다. 널리 알려진 지표하부 오염방지 공법으로서는 팩카그라우팅 공법(packer Grouting Method), 트레미공법(Tremie Method)과 브레든 헤드 공법(Bradenhead Method)이 있다. 그러나, 현재 대다수의 지하수 개발 현장에서는 단순히 강관을 굴착공에 억지박음함으로써 지표하부 오염방지에 가름하는 사례가 다반사이며 깊은 심도의 경우에도 종래 공법으로는 한계를 가질 수밖에 없는 실정이었다. 따라서, 본 연구에서는 차폐 팩카(Protection Packer)를 이용하여 고, 저심도의 어느 지하수 심정에서나 용이하게 역주입 상향그라우팅이 가능한 여건이 될 수 있도록 시공 사례를 통해 연구를 수행하였다.

• The Journal of the Acoustical Society of Korea
• /
• v.18 no.1
• /
• pp.45-52
• /
• 1999

In this thesis, a packer is proposed and designed for removing the bottle-neck effect and easy signal processing using a new algorithm with the operation frequency of 54MHz. To verify the performance of the proposed packer, DCT coefficient encoding block with ROM table using a combinational logic is designed and its output data are used the input data of the packer. Circuits in this thesis are designed by using VHDL code and its modeling and simulation are performed by SYNOPSYS tool using $0.65{\mu}m$ rule.

• Proceedings of the Korean Geotechical Society Conference
• /
• 2008.03a
• /
• pp.405-411
• /
• 2008

The pressurized grouting soil nailing method using rubber membrane packer system was developed for recycling materials to minimize environmental pollution and reducing construction costs. For this purpose, field pull-out tests were performed to evaluate the characteristics of soil nailing by measuring tensile stresses and axial displacements.

• Cement
• /
• s.67
• /
• pp.53-56
• /
• 1977

• Cement Symposium
• /
• no.21
• /
• pp.77-81
• /
• 1993

• Journal of the Korean Geosynthetics Society
• /
• v.16 no.2
• /
• pp.149-158
• /
• 2017

Permeating injection is commonly known as an ideal type of injection in grouting reservoir embankment, yet often-combined permeating and fracturing injection grouting operation can disturb the original soil. A grouting method has been regarded as effective and developed to ameliorate the possible disturbance problem. It involves compaction grouting with low expansive pressure near the injection hole and repetitive injection and compaction with grout material that allows ideal permeating injection. This thesis develops Hybrid Grout (ie. HG grout) that allows various application in any ground condition combined together, has high fineness and low viscosity, and expands permeation injection to silty sand. It researches on the injection effect of permeable compaction grout which is done with PC packer and is a combination of HG grout and expansion agent to obtain permeation compaction effect on the area near grout injection spot by developing Permeable Compaction Type Packer(ie. PC packer). As the developed PC packer, HG grout, and and expansion agent (HI-E) are applied to reservoir embankment reinforcement grouting, possibile permeation compaction effect that satisfies reservoir embankment grouting standard is confirmed according to the research.