• The Journal of Korean Physical Therapy
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• v.14 no.4
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• pp.423-440
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• 2002

The purpose of this study is to investigate the conception and developmental process of stretching in sports physical therapy. This study is to find conception of stretching, feature and effect, principles and fundamental rule, consideration of enforcement and developmental process in order to use the basic material which is very helpful in the every field and the scene of sports needing stretching. Flexibility is the ability to move muscles and joints through their full ranges of motion. Flexibility is developed by stretching. About player who insufficiency of flexibility, patient and disabled person who restrict of range of motion, older adult who reduce of flexibility, promote of flexibility for upgrading stability and efficiency of body on the based of scientific principles is completed by stretching. The method of stretching has been developed with passive stretching, CR, PNF stretching, PIC stretching, MET stretching in the order. The effects that we can get through stretching are as follows : 1. Enhance physical fitness. 2. Optimize learning, practice and performance of many types of skilled movement. 3. Increase mental and physical relaxation. 4. Promote development of body awareness. 5. Reduce risk of joint sprain or muscle strain. 6. Reduce risk of back problem. 7 Reduce muscular soreness. 8. Reduce the severity of painful menstruation for female athletes. 9. Reduce muscular tension. 10. Advance recognition of body.

• 한국정보디스플레이학회:학술대회논문집
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• 2007.08a
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• pp.986-989
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• 2007

In this review, several aspects for improving the quality of materials parameters of Nematic Liquid Crystals (NLCs) and Ferroelectric Liquid Crystals (FLCs) will be discussed. In particular the decrease of the response time is a need. It will be demonstrated that the materials parameters of NLCs and FLCs can be improved among other ways due to optimization of chemical structures of the NLCs and /or FLCs mixtures, due to doping them with nanomaterials and by using fast elastic relaxation processes.

• Management Science and Financial Engineering
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• v.11 no.2
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• pp.85-103
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• 2005

In this paper, we consider the routing and wavelength assignment problem in survivable WDM transport network without wavelength conversion. We assume the single-link failure and a path protection scheme in optical layer. When a physical network and a set of working paths are given, the problem is to select a link-disjoint protection path for each working path and assign a wavelength for each working and protection path. We give an integer programming formulation of the problem and propose an algorithm to solve it. Though the formulation has exponentially many variables, we solve the linear programming relaxation of it by using column generation technique. We devise a branch-and price algorithm to solve the column generation problem. After solving the linear programming relaxation, we apply a variable fixing procedure combined with the column generation to get an integral solution. We test the proposed algorithm on some randomly generated data and test results show that the algorithm gives very good solutions.

• Proceedings of the KIEE Conference
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• 2006.10a
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• pp.12-13
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• 2006

The physical properties of DMPC monolayer were made for dielectric relaxation phenomena by the detection of the surface pressures and displacements current. The current was measured after the electric bias across the manufactured MIM device. It is found that the phospolipid monolayer of dielectric relaxation takes a little time and depend on the molecular area. When electric bias is applied across the manufactured MIM device by the deposition condition of phospolipid mono-layer, it wasn't breakdown when the higher electric field to impress by increase of deposition layers.

• Structural Engineering and Mechanics
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• v.53 no.2
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• pp.277-296
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• 2015

The objective of this paper is to investigate the surface waves in fibre-reinforced anisotropic thermoelastic medium subjected to gravity field. The theory of generalized surface waves has firstly developed and then it has been employed to investigate particular cases of waves, viz., Stoneley waves, Rayleigh waves and Love waves. The analytical expressions for displacement components, force stress and temperature distribution are obtained in the physical domain by using the harmonic vibrations. The wave velocity equations have been obtained in different cases. The numerical results are given and presented graphically in Green-Lindsay and Lord-Shulman theory of thermoelasticity. Comparison was made with the results obtained in the presence and absence of gravity, anisotropy, relaxation times and parameters for fibrereinforced of the material medium. The results indicate that the effect of gravity, anisotropy, relaxation times and parameters for fibre-reinforced of the material medium are very pronounced.

• Journal of the Korean Magnetic Resonance Society
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• v.23 no.2
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• pp.40-45
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• 2019

The phase transition temperatures and thermodynamic properties of $(NH_4)_2MnCl_4{\cdot}2H_2O$ grown by the slow evaporation method were studied using differential scanning calorimetry and thermogravimetric analysis. A structural phase transition occurred at temperature $T_{C1}$ (=264 K), whereas the changes at $T_{C2}$ (=460 K) and $T_{C3}$ (=475 K) seemed to be chemical changes caused by thermal decomposition. In addition, the chemical shift and the spin-lattice relaxation time $T_{1{\rho}}$ were investigated using $^1H$ magic-angle spinning nuclear magnetic resonance (MAS NMR), in order to understand the role of $NH_4{^+}$ and $H_2O$. The rise in $T_{1{\rho}}$ with temperature was related to variations in the symmetry of the surrounding $H_2O$ and $NH_4{^+}$.

• Steel and Composite Structures
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• v.48 no.6
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• pp.641-648
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• 2023

In this article, we explore the issue concerning semiconductors half-space comprised of materials with varying thermal conductivity. The problem is within the framework of the generalized thermoelastic model under one thermal relaxation time. The half-boundary space's plane is considered to be traction free and is subjected to a thermal shock. The material is supposed to have a temperature-dependent thermal conductivity. The numerical solutions to the problem are achieved using the finite element approach. To find the analytical solution to the linear problem, the eigenvalue approach is used with the Laplace transform. Neglecting the new parameter allows for comparisons between numerical findings and analytical solutions. This facilitates an examination of the physical quantities in the numerical solutions, ensuring the accuracy of the proposed approach.

• Investigative Magnetic Resonance Imaging
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• v.7 no.1
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• pp.39-46
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• 2003

Purpose : To develop a theoretical model for magnetic relaxation behavior of the superparamagnetic nano-particle agent, which demonstrates multi-functionality such as liver- and lymp node-specificity. Based on the developed model, the computer simulation was performed to clarify the relationship between relaxation time and the applied magnetic field strength. Materials and Methods : The ultrasmall superparamagnetic iron oxide (USPIO) was encapsulated with biocompatiable polymer, to develop a relaxation model based on outsphere mechanism, which was resulting from diffusion and/or electron spin fluctuation. In addition, Brillouin function was introduced to describe the full magnetization by considering the fact that the low-field approximation, which was adapted in paramagnetic case, is no longer valid. The developed model describes therefore the T1 and T2 relaxation behavior of superparamagnetic iron oxide both in low-field and in high-field. Based on our model, the computer simulation was performed to test the relaxation behavior of superparamagnetic contrast agent over various magnetic fields using MathCad (MathCad, U.S.A.), a symbolic computation software. Results : For T1 and T2 magnetic relaxation characteristics of ultrasmall superparamagnetic iron oxide, the theoretical model showed that at low field (<1.0 Mhz), $\tau_{S1}(\tau_{S2}$, in case of T2), which is a correlation time in spectral density function, plays a major role. This suggests that realignment of nano-magnetic particles is most important at low magnetic field. On the other hand, at high field, $\tau$, which is another correlation time in spectral density function, plays a major role. Since $\tau$ is closely related to particle size, this suggests that the difference in R1 and R2 over particle sizes, at high field, is resulting not from the realignment of particles but from the particle size itself. Within normal body temperature region, the temperature dependence of T1 and T2 relaxation time showed that there is no change in T1 and T2 relaxation times at high field. Especially, T1 showed less temperature dependence compared to T2. Conclusion : We developed a theoretical model of r magnetic relaxation behavior of ultrasmall superparamagnetic iron oxide (USPIO), which was reported to show clinical multi-functionality by utilizing physical properties of nano-magnetic particle. In addition, based on the developed model, the computer simulation was performed to investigate the relationship between relaxation time of USPIO and the applied magnetic field strength.

• Journal of The Korean Society of Integrative Medicine
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• v.10 no.3
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• pp.221-232
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• 2022

Purpose : In this study, rectus abdominis relaxation intervention was administered to office workers who were experiencing low back pain due to sitting for extended periods of time in an incorrect posture. This study aimed to develop an effective treatment program for individuals who experience low back pain. This was done by verifying changes using the Korean Oswestry Disability Index (K-ODI) and considering kyphosis. Both factors are related to low back pain. Methods : This study included 39 office workers with low back pain. The participants were randomly assigned to three groups. 1) The functional massage and self-stretching (FAS) group (n=14). 2) The diaphragmatic breathing and self-stretching (DAS) group (n=13). 3) The self-stretching (S) group (n=12). All groups applied the intervention for 30 minutes a day, thrice a week for four weeks. All participants were evaluated using the K-ODI and thoracic kyphosis measurements before and after the intervention. Results : The findings of this study are as follows. All three groups had improved K-ODI scores after the intervention. The FAS and DAS groups showed a greater effect than the S group. However, there was no difference in effect between the FAS and DAS groups. Kyphosis was not improved in any of groups after the intervention, and there was no difference between the three groups. Conclusion : This study showed that the FAS, DAS, and S programs were effective relaxation interventions that improved the K-ODI for office workers with low back pain. The FAS and DAS programs were more effective than the S program. Therefore, it is recommended to combine relaxation and stretching of the rectus abdominis muscle for office workers who experience low back pain. Clinically, a relaxation intervention that is most appropriate for the patient, depending on his or her condition, should be.

• The Journal of Korean Physical Therapy
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• v.14 no.4
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• pp.475-486
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• 2002

Orthopaedic manual therapy(OMT) includes knowledge in arthokinematic, biological, behavioral, biomechanical, patholology, anatomy, and clinical science. it allows proper approach to patient evaluation and program development and relieves joint and soft tissue lesions. The OMT has sports injurys, traumatic, developmental, and neuromusculoskeletal disorders of acute and chronic states, and prevention of dysfunction as well as the development, improvement, restoration, or maintenance of joint and muscular mobility, stability, relaxation, strenth, endurance, balance, and functional skills. The purpose of this article has to define and clarify the change and development of basic concepts of orthopaedic manual therapy. OMT is ancient in origin. The book of ' Manipulation Past and Present ' contains pictures recording various types of joint mobilization by Hippocrates. Recently, there are many kinds of manual therapeutic maneuvers to assess and relieve joint and soft tissue lesions developed by James Cyriax, John McM Mennell, Brian R Mullign, Robin McKenzie, Freddy Kaltenborn, Geoffrey Maitland, and Ola Grimsby.