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.

A Study of the Determinants of Outbound Travel Expenditure of Malaysian Travelers

( Kan Lye Leng ),( Soo Keng Leng ) 세계문화관광학회 2009 International Journal of Culture and tourism Resea Vol.2 No.1

There is a growing trend of Malaysian traveling abroad despite the limited literature available on Malaysian outbound travel and its expenditure patterns. Hence, this paper attempts to study if there is any significant difference in the average expenditure of outbound travelers of different income level, socio-demographic factors and travel related behavior. It also examines the relationship between travelers’ expenditure patterns and their income level, and identifies other determinants that influence travel expenditure. There is a significant difference in the average expenditure for different samples of income level, marital status, age group and travel group size. Total travel expenditure, accommodation, food and beverage, transportation, entertainment and recreation and gift expenses are found to have significant positive relationships with income level. There is also a significant relationship documented for gender and marital status with total travel expenditure. Some of these results are consistent with previous findings. The study further discusses its limitations and provides some recommendations for future research.

A Study of the Oxygen Plasma Treatment on the Serviceability of a Wool Fabric

Kan, C.W.,Chan, K.,Yuen, C.W.M. The Korean Fiber Society 2004 Fibers and polymers Vol.5 No.3

Low temperature plasma (LTP) treatment using oxygen gas was applied to a wool fabric. The LTP treated wool fabric was tested with several methods: ASTM D5035-1995, ASTM D1424-1996, AATCC Test Method 99-2000, AATCC Test Method 61-2001 lA, AATCC Test Method 15-2002 and AATCC Test Method 8-2001 and the results were compared with the industrial requirements (ASTM D3780-02 and ASTM D4155-0l). The results revealed that the LTP treated wool fabric could fulfil the industrial requirements. The results of the investigation were discussed thoroughly in this paper.

A multi-time-scale analysis of chemical reaction networks: II. Stochastic systems

Kan, Xingye,Lee, Chang Hyeong,Othmer, Hans G. Springer-Verlag 2016 Journal of mathematical biology Vol.73 No.5

<P>We consider stochastic descriptions of chemical reaction networks in which there are both fast and slow reactions, and for which the time scales are widely separated. We develop a computational algorithm that produces the generator of the full chemical master equation for arbitrary systems, and show how to obtain a reduced equation that governs the evolution on the slow time scale. This is done by applying a state space decomposition to the full equation that leads to the reduced dynamics in terms of certain projections and the invariant distributions of the fast system. The rates or propensities of the reduced system are shown to be the rates of the slow reactions conditioned on the expectations of fast steps. We also show that the generator of the reduced system is a Markov generator, and we present an efficient stochastic simulation algorithm for the slow time scale dynamics. We illustrate the numerical accuracy of the approximation by simulating several examples. Graph-theoretic techniques are used throughout to describe the structure of the reaction network and the state-space transitions accessible under the dynamics.</P>

Somatic embryogenesis and mass spectrometric identification of proteins related to somatic embryogenesis in Eruca sativa

Kan Chen,Hai-Jun Wu,Jian-Feng Chen,Xiao-Fang Cheng,Xiao Jing,Xin-Yu Wang 한국식물생명공학회 2012 Plant biotechnology reports Vol.6 No.2

Several different proteins expressed in embryogenic and nonembryogenic Eruca sativa calli were identified by combining one-dimensional SDS-PAGE protein mapping with matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) analysis. By querying the widely recognized MASCOT search engine, it was found that three of the proteins that were particularly strongly expressed in the embryogenic callus represented sucrose synthase, phospholipase D, and enolase, respectively. RT-PCR analysis also confirmed that the gene coding for enolase was transcribed especially strongly in the embryogenic callus but not in nonembyogenic callus. Finally, the relationship between the three proteins and somatic embryogenesis is discussed.

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.-