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김현실,김재승,강현주,김상렬,Kim, Hyun-Sil,Kim, Jae-Seung,Kang, Hyun-Joo,Kim, Sang-Ryul 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.4
Stress wave propagations in an elastic half space to a normal point force of ramp type in time are analyzed. The governing equations are transformed by applying the Laplace and Hankel transforms with respect to time and radial distance. The inversion of Laplace transforms are performed by employing the Cagniard-de Hoop method, where the Rayleigh waves at surface are obtained by including the residue terms. The stress waves computed at the location very cose to the surface are shown to be almost identical to the surface waves obtained by the residue method except the Rayleigh wavefront. It is found that at the surface, the stresses are dominated by the Rayleigh waves, whose amplitudes increase linearly with time when time is very large. It is also found that in the interior part, the radial stress has a logarithmic singularity at the shear wavefront, while tangential stress shows no singularity.
김현실,최필순 경산대학교 보건복지연구소 2000 保健福祉硏究 Vol.5 No.-
This study was done to investigate education area for rehabilitation and need for rehabilitative education among total hip replacement patients in Korea. The subjects were a convenience sample of 11 patients who had a total hip replacement surgery at 2 hospitals located in Kyunggi-Do, Korea. The data were collected from July 1st to end of September, 1996 using questionnaires developed by the authors. The data were analysed by a SPSS computer program. In this study, content area of education for total hip replacement patient were consisted of 6 area including 30 items. And this 6 area were 'knowledge about etiological factor & surgical procedure'(4 items), 'knowledge about pharmacological therapy'(3 items), 'knowledge about activities of daily living'(14 items), 'knowledge about activities for leisure'(3 items), 'knowledge about nutrition for reconvery'(2 items), and 'knowledge about management after discharge'(4 items). The results showed that the content area with the highest degree in need for rehabilitative education among total hip replacement patients were 'knowledge about etiological factor & surgical procedure', 'sign of complication', information about side effect of medication', whereas the content area with the lowest degree in need for rehabilitative education were 'time for sedentary activities', 'hospital visiting time for the follow-up check'.
김현실,김재승,강현주,김상렬,Kim, Hyeon-Sil,Kim, Jae-Seung,Gang, Hyeon-Ju,Kim, Sang-Ryeol 한국기계연구원 1999 硏究論文集 Vol.29 No.-
In naval ships, pump machineries are the major sources of airborne and structure-borne noise. Noise is critical issue in ships not only it causes annoyance to crews, but also it can increase the underwater radiated noise, which is crucial in anti-submarine warfare. In present study, it is discussed the reduction of structure-borne noise of pump machineries by showing several examples. The most typical and effective solution is to use double resilient mount system. However, in cases where double resilient system cannot be applied due to space and weight increase, rubber pad can be used to reduce the structure-borne noise. In principle, the concept of structure-borne noise reduction is the same as that of vibration isolation.
김현실 한국간호과학회 2000 Journal of Korean Academy of Nursing Vol.12 No.2
The purpose of this study was to test the theoretical model designed to explain juvenile delinquency by media violence. Data were collected through questionnaire survey over a period of 3 months. Subjects served for this study consisted of 537 adolescents including 217 delinquent adolescents and 320 student adolescents in Korea, sampled from Korean student population and delinquent adolescent population confined in juvenile correctional institutions, using proportional stratified random sampling method. In this study, exogeneous variable was family dynamic environment and endogeneous variables were character of adolescent including need satisfaction/ frustration, sociability, antisocial personality tendency, complaints of psychosomatic symptoms and depressive trend, juvenile delinquent behavior and media violence themes including the extent of interest in and exposure and modelling impulsiveness and modelling to media violence themes. A total of 18 instruments were used to operationalized concepts in this model. A validation study indicated that internal consistencies for the 18 instruments which the researcher used were reliable. The one month test-retest correlation for these instruments ranged from 0.54 to 0.88. Statistical methods employed were descriptive statistics and covariance structural modelling. In summarized conclusion, it was found that media violence served as the most contributor to juvenile delinquency by direct effect of 0.64(t=10.18). That is, as the adolescents have to be the higher extent of interest in and exposure and modelling impulsiveness and modelling to media violence themes, they will show the more frequency of delinquent behavior. The single most powerful contributor by total effect of 0.73(t=7.90) (direct effect=0.19, indirect effect=0.54) to the development of delinquent behavior identified in this study was a construct defining family dynamic environment. That is, as the adolescents had to be more unstable family dynamic environment, they became more frustrated to their psychological need, and revealed the more maladaptive personality pattern, consequently they behaved the higher misconducts such as juvenile delinquency through media violence.