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Search Results: 1 - 10 of 7662 matches for " Youngsuk Park "
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Knowledge, Health Beliefs and Screening Status of Prostate Cancer among Middle-Aged and Elderly Men  [PDF]
Eunjoo Lee, Youngsuk Park, Jeongsook Park
Open Journal of Nursing (OJN) , 2016, DOI: 10.4236/ojn.2016.69070
Abstract: Purpose: The aim of this study was to examine and evaluate the level of prostate cancer knowledge and health beliefs among middle-aged and elderly men. Methods: In this descriptive study carried out in December 20, 2015 through January 20, 2016, we enrolled 147 men aged 50 - 70 years old. Data were collected by using three questionnairs including knowledge, health beliefs, and screening status of prostate cancer. Results: Our findings showed that only 20.4% of interviewers had experience of digital rectal examination or prostatic specific antigen test for prostate cancer screening. The prostate cancer knowledge was found to be significantly high in prostate cancer examinees compared to non-examinees. The correct answer rate of prostate cancer knowledge was only 44.7% at average. Despite of good perceived seriousness about prostate cancer, the screening rate was only 20.4% and the examinees indicated significantly high perceived sensitivity compared to non-examinees. The level of the perceived barrier was lower in men who had experience in health examination or prostate cancer examination than without experience. Conclusion: The significant factors including age, educational level, income and cancer insurance status need to be considered in nursing education program in order to deliver accurate knowledge about prostate cancer. Also, the effective interventions are necessary to increase sensitivity and reduce barriers of prostate cancer and screening.
Oncothermia Application for Various Malignant Diseases
Youngsuk Lee
Conference Papers in Science , 2013, DOI: 10.1155/2013/245156
Abstract: Oncothermia was introduced to our hospital in 2010. Our objective is to report results of 277 patients treated by oncothermia during 20 months. We present some characteristic cases and statistical study of the overall results. We concluded by stating the feasibility of oncothermia to treat high variety of malignant diseases also in their very advanced (T4N3M1) stages. 1. Background Hyperthermia is a long-time used treatment in oncology, having debates about its applicability and working mechanisms. There are numerous technical solutions [1, 2] but the results are mostly controversial like the cervix studies (the positive [3] and the opposite effects [4] of hyperthermia were published). The basic problem is the missing control, due to the simple fact of the focusing possibilities. The sophisticated technologies are concentrating the localized and focused energy on the target; however the temperature is distributed from any sharply focused volume, naturally trying to be equalized in its neighborhood. The smearing of the temperature is accelerated by the physiologic feedback to cool down the specially heated volume by the extra blood flow in the heated part of the body [5, 6]. The extra blood flow naturally supports the tumor by nutrients (mainly glucose) and increases the risk of dissemination. The focusing and heating mechanisms are certainly different in various kinds of technical solutions, which reflects the problem of the standardization; no reference point exists [7]. 2. Method Avoiding the controversies, oncothermia was used in our study. Oncothermia has realized the root of the problem: impossibility to localize the temperature in the desired volume. The solution was the nanoheating technology. Oncothermia selects and heats up very locally (in nanoscopic range) the membrane of the malignant tumors, [8]. This effect excites important pathologic pathways to promote apoptosis [9] and overcome the main problem of the technical challenge by large energy intake but on a very well-localized place. It needs 60?min to reach the general temperature equilibrium, which is the time of the active oncothermia session. The oncothermia in this line is working permanently by thermal nonequilibrium conditions. We collected all patients ( ) who had at least one oncothermia treatment in time interval November 2010–July 2013 (20 months). The patient group had males and females. Average age was 53?y (7–84?y). The various diseases and the number of patients involved in the study were heterogeneous (see Figure 1) aiming to check the efficacy on the wide range of diseases
Non-Local Analysis of Forming Limits of Ductile Material Considering Void Growth
Non—Local Analysis of Forming Limits of Ductile Material Considering Void Growth

Youngsuk Kim,
YoungsukKim

材料科学技术学报 , 2003,
Abstract: The current study performed a finite element analysis of the strain localization behavior of a voided ductile material using a non-local plasticity formulation in which the yield strength depends on both an equivalent plastic strain measurement (hardening parameter) and Laplacian equivalent. The introduction of gradient terms to the yield function was found to play an important role in simulating the strain localization behavior of the voided ductile material. The effect of the mesh size and characteristic length on the strain localization were also investigated. An FEM simulation based on the proposed non-local plasticity revealed that the load-strain curves of the voided ductile material subjected to plane strain tension converged to one curve, regardless of the mesh size. In addition, the results using non-local plasticity also exhibited that the dependence of the deformation behavior of the material on the mesh size was much less sensitive than that with classical local plasticity and could be successfully eliminated through the introduction of a large value for the characteristic length.
Calculations of Forming Limit Diagrams for ChangingStrain Paths on the Formability of Sheet Metal
Calculations of Forming Limit Diagrams for Changing Strain Paths on the Formability of Sheet Metal

Hyunsung Son,Youngsuk Kim,

材料科学技术学报 , 2001,
Abstract: In the press shop of most sheet metals, sheet material undergoes complex strain path and also the formability of the sheet material was limited by the stretchability of the material. Therefore, the precise prediction of path-dependent FLD based on M-K approach using generalization of Hill's 1979 anisotropic yield criterion and introducing a strain gradient effect in the constitutive equation. Also, the theoretically obtained FLD will be compared with experimental data for steel sheets.
Stability of Rossby waves in the beta-plane approximation
Youngsuk Lee,Leslie M. Smith
Physics , 2002, DOI: 10.1016/S0167-2789(03)00010-1
Abstract: Floquet theory is used to describe the unstable spectrum at large scales of the beta-plane equation linearized about Rossby waves. Base flows consisting of one to three Rossby wave are considered analytically using continued fractions and the method of multiple scales, while base flow with more than three Rossby waves are studied numerically. It is demonstrated that the mechanism for instability changes from inflectional to triad resonance at an O(1) transition Rhines number Rh, independent of the Reynolds number. For a single Rossby wave base flow, the critical Reynolds number Re^c for instability is found in various limits. In the limits Rh --> infinity and k --> 0, the classical value Re^c = sqrt(2) is recovered. For Rh --> 0 and all orientations of the Rossby wave except zonal and meridional, the base flow is unstable for all Reynolds numbers; a zonal Rossby wave is stable, while a meridional Rossby wave has critical Reynolds number Re^c = sqrt(2). For more isotropic base flows consisting of many Rossby waves (up to forty), the most unstable mode is purely zonal for 2 <= Rh < infinity and is nearly zonal for Rh = 1/2, where the transition Rhines number is again O(1), independent of the Reynolds number and consistent with a change in the mechanism for instability from inflectional to triad resonance.
Molecular dynamics simulation for grain boundary deformation under tensile loading condition
Molecular Dynamics Simulation for Grain Boundary Deformation under Tensile Loading Condition

Youngsuk Kim,Dongyoul Choi,Sungyeun Won,

材料科学技术学报 , 2001,
Abstract: In this study, MD simulations have been performed to observe the behavior of a grain boundary in an alpha -Fe plate under 2-dimensional loading. In MD simulation, the acceleration of every molecule can be achieved from the potential energy and the force interacting between each molecule, and the integration of the motion equation by using Verlet method gives the displacement of each molecule. Initially, four α-Fe rectangular plates having different misorientation angles of grain boundary were modeled by using the Johnson potential and Morse potential. We compared the potential energy of the grain boundary system with that of the perfect structure model. Also, we could obtain the width of the grain boundary by investigating the local potential energy distribution. The tensile loading for each grain boundary models was applied and the behavior of grain boundary was studied. From this study it was clarified that in the case using Johnson potential, the obvious fracture mechanism occurs along the grain boundary, in the case of Morse potential, the diffusion of the grain boundary appears instead of the grain boundary fracture.
Three-Dimensional Rigid-Plastic FEM Simulation of Bulk Forming Processes with New Contact and Remeshing Techniques

Debin SHAN,Youngsuk Kim,Hyunsoo Kim,

材料科学技术学报 , 2001,
Abstract:
Quasimolecular Dynamic Simulation for Bending Fracture of Laminar Composite Materials

Youngsuk Kim,Youngmoon Lee,Dongyoul Choi,Chanil Kim,

材料科学技术学报 , 2001,
Abstract: Recently, quasimolecular dynamics has been successfully used to simulate the deformation characteristics of actual size solid materials. In quasimolecular dynamics, which is an attempt to bridge the gap between atomistic and continuum simulations, molecules are aggregated into large units, called quasimolecules, to evaluate large scale material behavior. In this paper, a 2-dimensional numerical simulation using quasimolecular dynamics was performed to investigate laminar composite material fractures and crack propagation behavior in the uniform bending of laminar composite materials. It was verified that under bending deformation laminar composite materials deform quite differently from homogeneous materials.
The Finite-Element Modeling of Dynamic Motions of a Constraint Wind Turbine and the System Diagnosis for the Safety Control  [PDF]
Raiwung Park
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.512123
Abstract:

The aim of this paper is to present a finite element modeling of the dynamic motion of a turbine rotor and its controller design with the mass unbalance under a crack on a rotating shaft. This process is an advanced method to the mathematical description of a system including an influence of a mass unbalance and a crack on the rotor shaft. As the first step, the shaft is physically modeled with a finite element method and the dynamic mathematical model is derived by using the Hamilton principle; thus, the system is represented by various subsystems. The equation of motion of a shaft with a mass unbalance and a crack is established by adapting the local mass unbalance and stiffness change through breathing and gaping from the existence of a crack. This is a reference system for the given system. Based on a fictitious model for transient behavior induced from vibration phenomena measured at the bearings, an elementary estimator is designed for the safety control and detection of a mass unbalance on the shaft. Using the state estimator, a bank of an estimator is established to get the diagnosis and the system data for a controller.

The effect of individualized music on agitation for home-dwelling persons with dementia  [PDF]
Heeok Park
Open Journal of Nursing (OJN) , 2013, DOI: 10.4236/ojn.2013.36061
Abstract:

Purpose: The purpose of this study was to test the effect of individualized music on agitation for homedwelling patients with dementia. Method: One group pre-post test was used for research design and a total of 26 subjects participated in this study. Individualized music intervention was subjects’ listening to their preferred music for 30 minutes prior to peak agitation time twice a week for a total of four sessions. The subject’s agitation levels were measured for three different points: thirty minutes prior to listening to music, 30 minutes while listening to the music, and after listening to the music throughout the 4 sessions. To measure the agitation level, the modified CohenMansfield Agitation Inventory was used. A Paired ttest was used for data analysis. Results: Most subjects were female (73.1%), Caucasian (92.4%), Protestant (50%), and independent activity (53.8%). The mean of the subjects’ MMSE scores was 8.08 (8.17). The most favorite music types included country/western music (31.0%), religious music (26.9%), and big band (26.9%). Agitation level decreased while listening to the music compared to the baseline (t = 3.70, p < .001). Conclusion: The findings of this study would provide meaningful data to develop an individualized music intervention protocol to control agitation for homedwelling patients with dementia.

 

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