• Proceedings of the KSEG Conference
• /
• 2002.04a
• /
• pp.109-114
• /
• 2002

Development of a three-dimensional mine visualization model for a section of the mine is addressed first. Discontinuity orientation and location information was taken from this visualization model for use in slope stability analyses. Estimated shear strength properties of discontinuities and mechanical properties of intact rock from the rock mass samples obtained from the mine are discussed next. The third part of the paper is focused on the results obtained for maximum safe slope angles for the section considered of the mine based on block theory analysis conducted under only the gravitational forces using the mapped discontinuities at the mine. Finally, the effects of water that exist in the rock mass, a tension crack, slope face inclination, overall wedge height and double benching on factor of safety of wedge stability are illustrated through limit equilibrium slope stability analyses conducted on a single tetrahedral wedge belonging to potential key block category that exist in the investigated area of the mine.

• The Journal of Korean Medicine
• /
• v.37 no.4
• /
• pp.45-48
• /
• 2016

Objectives: A diagnostic imaging in a fifty five year-old woman diagnosed orthopedically as ossification of posterior longitudinal ligament (OPLL) at C5 and C6 levels was reinterpreted for Chuna mannual therapy. The cervical spinal lesion in simple X-ray and CT scan images was discussed by spinal listing systems and disc block subluxation theory. The primary adjustive target was C4 disc block subluxation, which had been affected by kyphosis. Chuna manual therapy based on diagnostic images could be helpful for adjusting spinal subluxation, correcting its adaptation curvature, and preventing its latent pathology efficiently.

• Structural Engineering and Mechanics
• /
• v.24 no.2
• /
• pp.181-194
• /
• 2006

The masonry is a complex heterogeneous material and its shear deformation and fracture is associated with very complicated progressive failures in masonry structure, and is investigated in this paper using a mesoscopic mechanical modelling, Considering the heterogeneity of masonry material, based on the damage mechanics and elastic-brittle theory, the newly developed Material Failure Process Analysis (MFPA) system was brought out to simulate the cracking process of masonry, which was considered as a three-phase composite of the block phase, the mortar phase and the block-mortar interfaces. The crack propagation processes simulated with this model shows good agreement with those of experimental observations by other researchers. This finding indicates that the shear fracture of masonry observed at the macroscopic level is predominantly caused by tensile damage at the mesoscopic level. Some brittle materials are so weak in tension relative to shear that tensile rather than shear fractures are generated in pure shear loading.

• Proceedings of the Korea Concrete Institute Conference
• /
• 1991.10a
• /
• pp.107-112
• /
• 1991

The object of this study is to investigate material characteristics and flexural behavior of high strength concrete. Principal causes of variations of high compressive strength include the strength-producing capabilities of cement and silica hume. Compressive strength of 1200 kgf/$\textrm{cm}^2$ is introduced for identifying the effect of the variation of the size of porocity and alternative method of measurement, Acoustic Emition method, is applied to examine the phenominon of concrete failure. The main test variables in the beam element are tensile steel ratios, presence of shear reinforcement, and change of steel shape. The estimation of stress block in the flexural test of this element tends to support the present theory and may suggest a desirable shape of the stress block.

• Journal of Communications and Networks
• /
• v.9 no.2
• /
• pp.150-158
• /
• 2007

We consider channel-coded multi-input multi-output (MIMO) orthogonal frequency-division multiplexing (OFDM) transmission and obtain a condition on its signal for it to attain the maximum diversity and coding gain. As this condition may not be realizable, we propose a suboptimal design that employs an orthogonal transform and a space-frequency interleaver between the channel coder and the multi-antenna OFDM transmitter. We propose a corresponding receiving method based on block turbo equalization. Attention is paid to some detailed design of the transmitter and the receiver to curtail the computational complexity and yet deliver good performance. Simulation results demonstrate that the proposed transmission technique can outperform the conventional coded MIMO OFDM and the MIMO block single-carrier transmission with cyclic prefixing.

• Culinary science and hospitality research
• /
• v.18 no.2
• /
• pp.51-63
• /
• 2012

This study aims to evaluate the satisfaction of students with a block system and it's effect on preparing students for a culinary career in the future. Summing up the outcomes of this study, male students reported higher levels of satisfaction than female students not only regarding a block system $perse$ (significant level 0.05) but with regards to career preparation as well (level 0.01). According to the choice variations disclosed by this study, a strong correlation exists with each of the p-values 0.000. Additionally, satisfaction with a block system appears to be strongly related to how well it is perceived to prepare students for future jobs with a RSQ = 0.840. Summing up the study's conclusions on gender effects, satisfaction with a block system is higher for males than females due to its being physically harder to take for female than for male students. Also, student grades have no correlation with satisfaction with a block system while they show significant differences in future job will. Freshmen (first year students) displayed the strongest level of satisfaction regarding future career preparation while seniors (fourth year students) the lowest. According to these results, we can posit a theory; gender and study years have an effect on the satisfaction with a block educational program and perceived value of career preparation. Therefore, culinary instructors and planners should consider this study's results to improve student satisfaction and future job preparedness.

• Transactions of the Korean Society of Mechanical Engineers
• /
• v.18 no.3
• /
• pp.573-583
• /
• 1994

In this study, the shock characteristics for high velocity impact phenomena during the initial shock state by the long rod penetrator are calculated. From these results we re-analyze the one-dimensional hydrodynamic penetration theory by introducing the effective area ratio calculated from the mushroomed strain which is dependent on impact velocity. Calculated penetration depth and mushroomed strain show good agreement with high velocity impact experimental data. In addition we visualize the shock wave propagation in a transparent acryle block.

• Journal of Korea Society of Digital Industry and Information Management
• /
• v.12 no.4
• /
• pp.71-79
• /
• 2016

This study proposes a performance model of a shared bus multi-processor system and analyzes the effect of input/output types on system performance and overload of shared resources. This system performance model reflects the memory reference time in relation to the effect of input/output types on shared resources and the input/output processing time in relation to the input/output processor, disk buffer, and device standby places. In addition, it demonstrates the contribution of input/output types to system performance for comprehensive analysis of system performance. As the concept of workload in the probability theory and the presented model are utilized, the result of operating and analyzing the model in various conditions of processor capability, cache miss ratio, page fault ratio, disk buffer hit ratio (input/output processor and controller), memory access time, and input/output block size. A simulation is conducted to verify the analysis result.

• Journal of Communications and Networks
• /
• v.11 no.5
• /
• pp.445-454
• /
• 2009

Cooperative transmission protocols are always designed to achieve the largest diversity gain and the network capacity simultaneously. The concept of diversity-multiplexing tradeoff (DMT) in multiple input multiple output (MIMO) systems has been extended to this field. However, DMT constrains a better understanding of the asymptotic interplay between transmission rate, outage probability (OP) and signal-to-noise ratio. Another formulation called the throughput-reliability tradeoff (TRT) was then proposed to avoid such a limitation. By this new rule, Azarian and Gamal well elucidated the asymptotic trends exhibited by the OP curves in block-fading MIMO channels. Meanwhile they doubted whether the new rule can be used in more general channels and protocols. In this paper, we will prove that it does hold true in decode-and-forward cooperative protocols. We deduce the theoretic OP curves predicted by TRT and demonstrate by simulations that the OP curves will asymptotically overlap with the theoretic curves predicted by TRT.

• Asia-Pacific Journal of Business
• /
• v.1 no.1
• /
• pp.73-95
• /
• 2010

European integration is characterized by the development of a transnational European identity, which is considered an integral part of the process. Northeast Asia has no similar projects to address the common identity issue, although cooperation is highly valued there as well. Identity and cooperation both require interdisciplinary approaches combining social psychology, international relations theory and international economics. This article considers the problems of applying existing studies on cooperation and identity as well as the European experience (with the Baltic Sea example) to the case of Northeast Asia. Transnational identities promote cooperation beyond the limits of rationalistic game theory, if countries of the region can define their identities and interests, commit to common goals, create shared discourses and reach a balance between nationalism and internationalism. In view of proposed negotiations on the free trade area between China, Korea and Japan and ongoing discussions about a possibility of introducing a common currency (ACU) it can be crucial to consider the importance of identity building as early as possible, before regional integration meets a stumbling block of egoistic rationality that is a problem in any model of cooperation.