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일부 법인 택시 노동자의 교통사고와 볼안전운전행동에 미치는 인적요인
윤간우,이상윤,임상혁 대한산업의학회 2006 대한직업환경의학회지 Vol.18 No.4
목적: 본 연구는 택시 업종을 대상으로 택시노동자의 다양한 인적특성들이 불안전운전행동을 매개로 교통사고와 어떠한 관련성이 있는지 살펴보고자 한다. 방법: 총 6개 택시사업장에 335명의 택시노동자를 대상으로 연구를 수행하였다. 자기기입식 설문조사 방법으로 지난 1년간 교통사고 횟수와 운전 중 불안전한 행동수준을 파악하였다. 이에 영향을 미칠 것으로 예상되는 개별 노동자의 인적 특성을 수집하여 요인분석을 통해 직무요인, 정신건강요인, 연령요인, 건강습관요인, 수면요인으로 범주화 하였고 위계적 다중회귀분석을 통해 이들 요인들이 불안전운전행동을 매개로 교통사고 횟수에 미치는 영향을 살펴보았다. 결과: 위계적 다중회귀분석 결과, 직무요인(β: 0.122), 수면요인(β: 0.114), 그리고 불안전운전행동(β: 0.018)은 교통사고 횟수에 직접적인 영향을 미치는 요인으로 나타났다. 불안전운전행동을 통해 교통사고 횟수에 간접적인 영향을 미치는 요인은 직무요인(β: 1.319), 정신건강요인(β: 6.429), 건강습관요인(β: 1.177)이었다. 결론: 본 연구 결과 택시 교통사고는 택시노동자의 일반적 특성, 정신건강상태, 직업적 특성이 불안전운전행동을 매개로 직·간접적인 영향을 미치고 있었으며, 효과적인 택시 교통사고 예방을 위해서는 이들 인적 요인에 대한 적절한 대책이 필요할 것이다. Objective: This study investigated the driving habits of taxi drivers, in order to examine the characteristics of human factors causing traffic accidents and unsafe driving behavior and to determine any relevancy among them. Method: Taxi drivers (N=335) answered a questionnaire investigating various measures of human factors, unsafe driving behaviors, and number of traffic accident experiences in the previous year. In factor analysis, the characteristics of human factors were classified into 5 common factors: job, mental health, age, health habit and sleep factor. A contextual mediated model was proposed to distinguish the distal (5 common factors) and proximal (unsafe driving behaviors) factors in predicting traffic accident involvement by hierarchical multiple regression. Result: In hierarchical multiple regression, job factor(β: 0.122), sleep factor (β: 0.114) and unsafe driving behaviors (β: 0.018) yielded a direct effect on the rate of traffic accidents. Mental health factor β: 6.429), job factor (β: 1.319) and health habit factor(β: 1.177) yielded a indirect effect on the rate of traffic accidents by unsafe driving behaviors. Conclusion: Various human factors co-related by the unique characteristics that exist in the taxi service industry have significant effects on the rate of traffic accidents mediated by unsafe driving behaviors. Therefore a proper countermeasure against these factors should be established in order to effectively reduce the rate of taxi accidents.
Numerical study on the internal flow characteristics of an axial-flow pump under stall conditions
Kan Kan,Yuan Zheng,Yujie Chen,Zhanshan Xie,Guang Yang,Chunxia Yang 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.10
When an axial-flow pump works in low flow rate conditions, rotating stall phenomena will probably occur, and the pump will enter hydraulic unsteady conditions. The rotating stall can lead to violent vibration, noise, turbulent flow, and a sharp drop in efficiency. This affects the safety and stability of the pump unit. To study the rotating stall flow characteristics of an axial-flow pump, the steady and unsteady internal flow field in a large vertical axial-flow pump was investigated using 3D computational fluid dynamic (CFD) technology. Numerical calculations were carried out using the Reynolds-averaged Navier–Stokes (RANS) solver and Menter's shear stress transport (SST) k-ω turbulence model. Steady flow characteristics including streamline, velocity vector, pressure and turbulent kinetic energy are presented and analyzed. Unsteady flow characteristics are described using post-processing signals for pressure monitoring points in the time and frequency domains. Using Q-criterion, the locations and evolution rules of the core region of the vortex structure in guide vanes under deep stall conditions were investigated. The reliability of the numerical simulation results was verified using the experimental prototype pressure fluctuation test. In this way, typical flow structure and pressure fluctuation characteristics in an axial-flow pump were analyzed, with contrastive analysis in design condition and stall conditions. Finally, the mechanism of low-frequency pressure fluctuation in a pump unit under the stall condition was revealed.
Kan Kan,Yuan Zheng,Shifeng Fu,Huiwen Liu,Chunxia Yang,Xin Zhang 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.4
Current research on the stability of tubular pumps is mainly concerned with the transient hydrodynamic characteristics. However, the structural response under the influence of fluid-structure interaction hasn’t been taken fully into consideration. The instability of the structure can cause vibration and cracks, which may threaten the safety of the unit. We used bidirectional fluid-structure interaction to comprehensively analyze the dynamic stress characteristics of the impeller blades of the shaft extension tubular pump device. Furthermore, dynamic stress of impeller blade of shaft extension tubular pump device was solved under different lift conditions of 0° blade angle. Based on Reynolds-average N-S equation and SST k-ω turbulence model, numerical simulation was carried out for three-dimensional unsteady incompressible turbulent flow field of the pump device whole flow passage. Meanwhile, the finite element method was used to calculate dynamic characteristics of the blade structure. The blade dynamic stress distribution was obtained on the basis of fourth strength theory. The research results indicate that the maximum blade dynamic stress appears at the joint between root of inlet side of the blade suction surface and the axis. Considering the influence of gravity, the fluctuation of the blade dynamic stress increases initially and decreases afterwards within a rotation period. In the meantime, the dynamic stress in the middle part of inlet edge presents larger relative fluctuation amplitude. Finally, a prediction method for dynamic stress distribution of tubular pump considering fluid-structure interaction and gravity effect was proposed. This method can be used in the design stage of tubular pump to predict dynamic stress distribution of the structure under different operating conditions, improve the reliability of pump impeller and analyze the impeller fatigue life.
간호윤 ( Kan Ho-yun ) 한국고전문학교육학회 2007 고전문학과 교육 Vol.14 No.-
This article is focused on ‘the significance of excavated material < Wisaengjeon > which takes 『Hangoldong』 as the subject material, and the misunderstanding about < Wigyungcheonjeon >’. 『Hangoldong』 may have been transcribed in the mid-seventeen century by a transcriber who lived in a period near the disturbances of war. Summaries of inquiry are as followed: ① So far there exist several kinds of < Wisaengjeon >, including ‘kan Ho Yun’ version of < Wisaengjeon >, Korean version of < Wi Dyeon >, ‘Jeo Cho’ version and ‘Yu Jae Young’ version in one category, and < Wigyungcheonjeon > based on 『Godamyoram』 which is along a different path of transcription in the other category. The official title is < Wisaengjeon >. ② The < Wisaengjeon > category is closer to the original copy, while the < Wigyungcheonjeon > was transcribed from a different version copied out of the same bottom book with the < Wisaengjeon >’s. ③ The transcriber of 『Hangoldong』 presumably had experienced the disturbances of war, was morally indignant at invaders, was a person of wide reading, and was an righteous intellectual in a noble family who had an indistinct consciousness of novels. ④ While it can be said that < Wigyungcheonjeon > has lower-quality sentences and less tension compared to < Jusaengjeon >, < Wisaengjeon > may be generously assessed. ⑤ Issues of the representative version and the author of < Wisaengjeon >, which have not been dealt with in this article, may still remain as the future subjects. Particularly, the authors can be studied in the positive point of view, by connecting the Korean version of < Wi Dyeon > with the 『Hangoldong』-based < Wisaengjeon >. Additional articles are expected regarding this matter. In conclusion, clear solutions about authors and in-depth discussions on literary works are encouraged, by informing fellows, seniors and gentlemen that ‘Gan Ho Yun’ version of < Wisaengjeon > has been added to the history of Chinese novels in 17th century.
Performance Analysis and Evaluation of Deployment in Small Cell Networks
( Kan Zheng ),( Yue Li ),( Yingkai Zhang ),( Zheng Jiang ),( Hang Long ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.3
Small cells are deployed in Heterogeneous Networks (HetNet) to improve overall performance. These access points can provide high-rate mobile services at hotspots to users. In a Small Cell Network (SCN), the good deployment of small cells can guarantee the performance of users on the basis of average and cell edge spectrum efficiency. In this paper, the performance of small cell deployment is analyzed by using system-level simulations. The positions of small cells can be adjusted according to the deployment radius and angle. Moreover, different Inter-Cell Interference Coordination (ICIC) techniques are also studied, which can be implemented either in time domain or in frequency domain. The network performances are evaluated under different ICIC techniques when the locations of Small evolved Nodes (SeNBs) vary. Simulation results show that the average throughput and cell edge throughput can be greatly improved when small cells are properly deployed with the certain deployment radius and angle. Meanwhile, how to optimally configure the parameters to achieve the potential of the deployment is discussed when applying different ICIC techniques.
Evaluating Antistatic Performance of Plasma-treated Polyester
Kan, C.W. The Korean Fiber Society 2007 Fibers and polymers Vol.8 No.6
Use of low temperature plasma treatment has been attempted in the textile industry and there the has been some success in the dyeing and finishing processes. In this paper, an attempt was made to apply low temperature plasma treatment to improve the antistatic property of polyester fabric. The polyester fabrics were treated under different conditions with low temperature plasma. An orthogonal array testing strategy was employed for obtaining the optimum treatment condition. After low temperature plasma treatment, the polyester fabrics were evaluated with different characterization methods, Under the observation of scanning electron microscope, the surface structure of the polyester fabric treated by low temperature plasma was found to be seriously altered which provided more capacity for polyester to capture moisture and hence increased the static charges dissipation. The relationship between moisture content and half-life decay time for static charges was studied and the results showed that the increase in moisture content would result in shortening of the time for static charges dissipation. Moreover, the antistatic property of the low temperature plasma treated polyester fabric was greatly improved. In addition, the antistatic property of the polyester fabric treated by low temperature plasma was compared with that of the polyester fabric treated with a commercial antistatic finishing agent.
Kan, Y.,Hu, Y.,Ren, Y.,Bareno, J.,Bloom, I.,Sun, Y.K.,Amine, K.,Chen, Z. Elsevier Sequoia 2014 Journal of Power Sources Vol.271 No.-
In situ high-energy X-ray diffraction was carried out to investigate the structural transformation of lithium cobalt oxides during the solid-state synthesis. Two allotropic phases were observed during the synthesis process; Li<SUB>2</SUB>Co<SUB>2</SUB>O<SUB>4</SUB> with a spinel structure was formed within the temperature window between 450 <SUP>o</SUP>C and 650 <SUP>o</SUP>C, beyond which Li<SUB>2</SUB>Co<SUB>2</SUB>O<SUB>4</SUB> was converted to its hexagonal counterpart, layered LiCoO<SUB>2</SUB>, through a cation exchange between Li and Co. In electrochemical tests, the Li<SUB>2</SUB>Co<SUB>2</SUB>O<SUB>4</SUB> was estimated to have a very low reversible capacity, ~20 mAh g<SUP>-1</SUP>, and a high initial irreversible capacity loss of about 80 mAh g<SUP>-1</SUP>. An interfacial phase between layered LiCoO<SUB>2</SUB> domain and spinel Li<SUB>2</SUB>Co<SUB>2</SUB>O<SUB>4</SUB> domain was also identified by ex situ high-resolution X-ray diffraction.