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.

Multiple athletic performances, maturation, and Functional Movement Screen total and individual scores across different age categories in young soccer players

Igor Bakaľár,Jaromír Šimonek,Janka Kanásová,Bohumila Krčmárová,Matúš Krčmár 한국운동재활학회 2020 JER Vol.16 No.5

Dynamic stress of impeller blade of shaft extension tubular pump device based on bidirectional fluid-structure interaction

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.

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.

『閒汨董』 所載 <韋生傳> 硏究

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.

Photodecomposition of Different Organic Dyes Using Fe-CNT/TiO2 Composites under UV and Visible Light

Kan Zhang,Ze-Da Meng,오원춘 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.2

The Fe-treated CNT/TiO2 photocatalysts mixed with anatase and rutile phase have been developed for the decomposition of non-biodegradable different organic dyes like methylene blue (MB), rhodamine B (Rh.B), and methyl orange (MO) in two conditions as ultraviolet and visible light respectively. The results indicate that all the Fe-CNT/TiO2 composites proved to be more efficient photocatalysts since degradation of MB at higher reaction rates, tthe decomposition rate of different dyes increases with an increase of Fe3+ concentration in composites the highest rate of decomposition of different dyes was noted under UV irradiation. These results can indicate that the large CNT network is facilitate the electron transfer and strongly adsorb dye molecules on the texted photocatalysts, iron is reactive in the photo-Fenton process resulting in high production of OH radicals and also high activity of the photocatalyst. And Fe particles can generate more photoinduced electrons to conduction band of TiO2 under visible light irradiation. The composites of Fe-CNT/TiO2 photocatalysts synthesized by a sol-gel method were characterized by BET, TEM, SEM, XRD and EDX.

The Comparative Efficacy of Albendazole and other Anthelmintics in the Treatment of Trichuris trichiura Infections

Kan, S. P. INSTITUTE OF TROPICAL MEDICINE YONSEI UNIVERSITY 1983 YONSEI REPORTS ON TROPICAL MEDICINE Vol.14 No.1

鞭蟲感染에 對한 Albendazole의 驅蟲效果를 다른 廣範圍 驅蟲濟들과 比較하여보았다. Oxantel pyrantel pamoate, mebendazole, flubendazole과 Albendazole의 一回 및 數回 投藥시 蟲卵感少率은 80%以上(82.9∼94.5%)이였다. 上記 네가지 驅蟲濟의 一回投藥에서 7.1∼36.1의 낮은 治療率을 얻었으나 數回投藥時 그 치료율은 52.0∼66.8여서 單回投藥時보다 높은 治療效果를 얻었다. 一面albendazole의 單回投藥인 경우 蟲卵感少率은 87.8%∼91.5이어서 그 감소율은 매우 높았으며 集團 投藥效果를 올리는데 albendazole의 一回投藥임을 알 수 있었다.

Effect of Heat-Treated Temperature on Surface Crystal Structure and Catalytic Activity of ACF/ZnO Composite under Ultraviolet Irradiation and Ultrasonication

Kan Zhang,오원춘 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.2

ACF/ZnO photocatalyst was synthesized by a sol-gel method using activated carbon fiber (ACF) and Zn (NO3)2 as precursors. Samples were characterized by Brunauer-Emmett-Teller measurements (BET), scanning electron microscope (SEM), X-ray diffraction (XRD), and energy dispersive X-ray (EDX). The XRD results showed that ACF/ZnO composites only included a hexagonal phase by heat-treated temperature at 400oC, 500oC, 600oC, and 700oC. The SEM analysis revealed that the ACF/ZnO composites did not exhibit any morphological changes of the catalyst surface according to the different heat-treated temperatures. The photocatalytic activity of the samples was tested for degradation of methylene blue (MB) solutions under ultraviolet (UV) light and ultrasonication respectively. The results showed that the photocatalytic activity of ACF/ZnO composites heat-treated at 500oC was higher than other samples, which is ascribed to the fine distribution of ZnO particles on the surface of the ACF. In addition, an ultrasound of low power (50 W) was used as an irradiation source to successfully induce ACF/ZnO composites to perform sonocatalytic degradation of MB. Results indicated that the sonocatalytic method in the presence of ACF/ZnO composites is an advisable choice for the treatments of organic dyes.

The Photocatalytic Decomposition of Different Organic Dyes under UV Irradiation with and without H₂O₂ on Fe-ACF/TiO₂ Photocatalysts

Kan Zhang,Won-Chun Oh 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.6

The Fe-ACF/TiO₂ composites were prepared by a sol-gel method and were characterized by nitrogen adsorption, Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), and Energy Dispersive X-ray (EDX). The Fe-CF/TiO₂ composites were developed for the decomposition of organic dyes by using a UV lamp. The decomposition effect was investigated under various conditions, such as three selected non-biodegradable organic dyes like Methylene Blue (MB), Methyl Orange (MO), Rhodamine B (Rh.B), and in the presence of Fe and hydrogen peroxide (H₂O₂). The photocatalytic activity was derived from possible combination effects, such as (1) adsorption of ACF, (2) generation of electron/hole by TiO₂, (3) photo-nton reaction of Fe, and (4) oxidation of Fe2+ to Fe3+ by H₂O₂.

Current Status of Protozoan Infections in Malaysia

Kan, S.P. INSTITUTE OF TROPICAL MEDICINE YONSEI UNIVERSITY 1987 YONSEI REPORTS ON TROPICAL MEDICINE Vol.18 No.-