• Korean Journal of Occupational Health Nursing
• /
• v.26 no.2
• /
• pp.105-113
• /
• 2017

Purpose: The purpose of this study was to identify the impact of workplace bullying experience and resilience on organizational commitment in general hospital nurses. Methods: Participants were 250 nurses of a general hospital in Seoul, Gyeonggi-do and Gangwoen-do. Data were collected using the structured questionnaires and analyzed using descriptive statistics, t-test, ANOVA, pearson's correlation coefficient, and multiple regression analysis. Results: As a result of multiple regression analysis, workplace bullying, resilience, clinical career, and work unit turned out to be variables that explained general hospital nurses' organizational commitment (Adj. $R^2=0.17$, p<.001). Conclusion: These findings suggest that bullying and resilience were defined as the influential variables on organizational commitment of nurses. Therefore strategies and programs about workplace bullying and resilience are needed to be developed.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 2003.05a
• /
• pp.375-380
• /
• 2003

This study is concerned with the machine part grouping m cellular manufacturing. To group machines into the set of machine cells and parts into the set of part families, new p-median model considering the production data such as the operation sequences and production volumes for parts is proposed. Unlike existing p-median models relying on the classical binary part-machine incidence matrix which does not reflect the real production factors which seriously impact on machine-part grouping, the proposed p-median model reflects the production factors by adopting the new similarity coefficient based on the production data-based part-machine incidence matrix of which each non-binary entry indicates actual intra-cell or inter-cell flows to or from machines by parts. Computation test compares the proposed p median model favorably.

• Proceedings of the KSME Conference
• /
• 2001.11b
• /
• pp.48-53
• /
• 2001

This experimental study is to research heat transfer characteristics in copper-water heat pipes with screen wick, the 150 and 200-mesh. Recent advances in the miniaturization and large capacity of electronic devices have had a major impact on the design of electronic equipment. As a result, a high-performance cooling system is needed. Experimental variables are inclination angle, number of layer and temperature of cooling water. The distilled water was used for the working fluid. At a inclination angle $6^{\circ}$, the 200-mesh screen wick 3-layer is shown the best heat transfer performance.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
• /
• 1996.10a
• /
• pp.167-172
• /
• 1996

A Dual Mass Flywheel system is a evolution to the reduction of torsional vibration and impact noise occuring in powertrain when a vehicle is eit-her moving or idling. The name already explains what it is : The mass of the conventional single mass flywheel is divided. One section continues to belong to the mass moment of inertia of the engine-side. The ot-her section increass the mass moment of inertia of the transmission-side. The two masses are connected via a spring /damping system. This reduces the speed at which the dreaded resonance occurs to below idle speed. Since 1984 Dual Mass Flywheel has been de-veloped again and again. But the prosidures of de-velopment of D.M.F system didn't have had differe-nce from conventional clutch system's trial and err-or This paper presents the method for systematical design of D.M.F system with demensionless design variables of D.M.F system mass ratio between two flywheels λ. natual frequency rate of two flywheel s, ${\gamma}$and viscosity coefficient ζ. And experimental re-sults are used to prove these theoretical results.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2001.05a
• /
• pp.449-455
• /
• 2001

도로교통소음의 저감을 위해 설치되는 방음벽의 성능평가를 위해서는 흡음률 및 투과손실과 같은 음향성능에 대한 평가뿐만 아니라, 풍압 및 충격하중과 같은 구조성능과 방음판 제작에 사용되는 재질에 관한 성능평가도 수반되어야 한다. 따라서, 본 논문에서는 이러한 방음벽의 성능평가를 위한 음향 구조 및 재질에 관한 시험 및 평가방법을 제시하였다.

• Smart Structures and Systems
• /
• v.14 no.4
• /
• pp.501-516
• /
• 2014

The rocking pier system (RPS) allows the columns to rock on beam or foundation surfaces during the attacks of a strong earthquake. Literatures have proved that seismic energy dissipated by the RPS through the column impact is limited. To enhance the energy dissipation capacity of a RPS bridge substructure, frictional hinge dampers (FHDs) were installed and evaluated by shaking table tests. The supplemental FHDs consist of two brass plates sandwiched by three steel plates. The strategy of self-centering design is to isolate the seismic energy by RPS at the columns and then dissipate the energy by FHDs at the bridge deck. Component tests of FHD were first conducted to verify the friction coefficient and dynamic characteristic of the FHDs. In total, 32 shaking table tests were conducted to investigate parameters such as wave forms of the earthquake (El Centro 1940 and Kobe 1995) and normal forces applied on the friction dampers. An analytical model was also proposed to compare with the tested damping of the bridge sub-structure with or without FHDs.

• Journal of KSNVE
• /
• v.9 no.3
• /
• pp.577-586
• /
• 1999

Estimation of damping ratio for vibration signals measured on the passenger car's sear is useful for the objective evaluation of impact harshness in car. The vibratio signal is a transient signal represented by many coupled modes of suspension system. Wavelet transform automatically decouples these modes in the time-frequency domain. Damping ratios for decoupled modes are obtained by logarithmic treatment for the Wavelet transformed signal. The objective evaluation using Wavelet transform has been well corresponded with subjective evaluation done by skilled engineers.

• Transactions of the Korean Society for Noise and Vibration Engineering
• /
• v.21 no.6
• /
• pp.491-498
• /
• 2011

The structural vibration due to earthquake or outside impact causes serious problem for building safety. A dynamic model of a friction damper which can be constructed and installed easily is needed to reduce the vibration of the building. In this paper, the experimental equation of a circular friction damper is derived and designed for reduction of a earthquake vibration of a building. The developed experimental equation is defined to simply design the capacity on design of the circular friction damper based on the results of the performance test. Finally this experimental equation can be used for the design of a circular friction damper.

• Journal of the Korean Society for Precision Engineering
• /
• v.19 no.3
• /
• pp.114-122
• /
• 2002

Electric conductivities, mechanical properties and friction properties were investigated far graphite-nylon composites impregnated with oil. Specific resistivity of composites containing oil from 2% to 6% were in the range of $10^7 ~10^6 \ohm$ cm, which were applicable for anti-static purpose of composites improved by the impregnation of graphite with 2%. Improvement in the impact strength and friction properties of graphite/nylon composites was achieved by the impregnation of oil. The coefficient of friction of the composites containing graphite from 2% to 4% and oil with 2 - 4% showed much loller than that of virgin nylon. Also the abrasive wear of the oil impregnated graphite composites were decreased about 1/3 - 1/10.

• Journal of Korean Academy of Nursing
• /
• v.37 no.7
• /
• pp.1184-1192
• /
• 2007

Purpose: The purpose of this study was to examine the relationship among fear of falling, pain, anxiety and depression, and to identify influencing factors in elderly women patients with degenerative arthritis living in the community. Method: The subjects of this study were 297 elderly women patients with degenerative arthritis. Data was collected by personal interviews using questionnaires. Data was analyzed by the SPSS(version 12.0) computer program, and it included descriptive statistics, one-way ANOVA, Pearson correlation coefficient, and Stepwise multiple regression. Results: There was a significant difference (p= .000) in fear of falling according to the level of pain, anxiety, and depression. There was a significant positive correlation among fear of falling, pain, anxiety and depression. Depression, pain, number of medication, age, and anxiety showed significant predictors (43.5%) for fear of falling. Conclusion: This study suggested that thoroughly assessing predictors making an impact on fear of falling in the initial nursing assessment is the most important for falls prevention of elderly women patients with degenerative arthritis in the community.