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.

이송식 아크플라즈마 장치에 의해 제조된 실리콘 나노분말의 특성에 대한 연구

간우섭 ( Woo-seop Kan ),박상희 ( Sang-hee Park ) 한국산업융합학회 2021 한국산업융합학회 논문집 Vol.24 No.6

This study was carried out experimentally on the production and properties of silicon nanopowders characteristics using a transferred type arc plasma apparatus. To investigate the properties of silicon nanopowder, the purity of argon gas(99.999%, 99.9%) and the partial pressure ratio of nitrogen gas(0∼90%) were varied. The total pressure in chamber is 400Torr and the silicon chunk amount used as raw material is 300g. The power supplied to the cathode to generate arc plasma was 9∼12kW/h, and the electrode was made of tungsten and graphite with a diameter of 13mm. The particle size, impurity elements and powder evaporation rate of the silicon powder were analyzed using the XRD, FE-SEM, TEM and electronic scale. According to the purity of argon gas, the silicon evaporation rate and the particle size were similar, and impurities were generated more in the case of 99.9% purity than 99.999%. When argon gas and nitrogen gas were mixed in the chamber, the silicon evaporation rate and particle size increased as the partial pressure ratio of nitrogen gas increased. In particular, when the partial pressure ratio of nitrogen gas was 80%, the silicon evaporation rate 80g/h, and the particle size was about 80∼100nm.

장애발생시기에 따른 삶의 만족도와 장애수용도와의 관계

간우선(Kan Woo-sun),조성재(Jo Song-jae),조주현(Cho Joo-hyun) 한국재활심리학회 2012 재활심리연구 Vol.19 No.1

본 연구는 장애발생시기에 따른 장애수용 및 삶의 만족도 간의 관계를 규명하는데 목적이 있으며 이 같은 목적을 달성하기 위해 전국 7개 광역시에 거주하고 있는 지체장애인을 대상으로 우편조사를 실시하였으며, 233부가 연구의 분석에 사용되었다. 연구결과를 살펴보면 첫째, 장애발생시기와 장애수용도 사이의 관계를 규명하기 위해 독립표본 t-검정을 사용하였으며, 그 결과 통계적으로 유의미한 관계가 있는 것으로 밝혀졌다. 즉 선천성과 후천성을 기준으로 한 장애발생시기가 개인이 획득하게 된 장애 수용 정도에 관계를 가진다는 것을 알 수 있다. 둘째, 장애발생시기와 장애수용도 사이에 관계를 규명하기 위해 독립표본 t-검정을 사용하였으며, 그 결과 통계적으로 유의미한 관계가 존재하지 않은 것으로 밝혀졌다. 이는 본 연구에서 정의한 삶의 만족도가 개인의 주관적 인지에 따른 것으로서 자신의 장애발생시기보다는 현재 본인의 사회환경적 요인에 더 많은 영향을 받을 수 있다는 점에서 기인한 것으로 추정된다. 이상의 연구결과를 바탕으로 장애발생시기를 고려한 맞춤화되고(customized) 개별화된(individualized) 직업재활 서비스제공 모델 개발을 위한 심도 있는 논의가 이루어져야 할 것이다. The purpose of this study is to examine the relationship of acceptance of disability and life satisfaction to the onset of disabilities among individuals with disabilities. Two-hundreds and thirty-three adults who are registered as having a physical disability residing in seven metropolitan cities in Korea participated in this study. A mail survey were used. A result of t-test indicated that a statistically significant relationship existed between the acceptance of disability and the onset of disabilities. That is, participants who experienced his or her disability at the earlier age of their lives are more likely to demonstrate more positive attitudes toward his or her disabilities as compared to their counterparts whose onset of disability were at later years of his/her life. However, no statistically significant relationship was found between the life satisfaction and the onset of disability. These findings suggested that an individualized vocational rehabilitation program which is based on the onset of disability as well as the level of acceptance of disability for individuals with physical disabilities are needed. Implications for the vocational rehabilitation practice and suggestions for the future research are discussed.

고품질 농업인 업무상 질병 및 손상조사 수행을 위한 연구

박진우 ( Jin Woo Park ),윤간우 ( Kan Woo Yoon ),채혜선 ( Hye Seon Chae ),김효철 ( Hyo Cher Kim ),이경숙 ( Kyung Suk Lee ) 한국조사연구학회 2013 조사연구 Vol.14 No.2

While Korean agricultural statistics are mainly focused on economic indicators such as population, income, yields, etc., it is lack of indicators relating to welfare of farmers. Specially, the statistics related agricultural occupational disease and injuries were not produced until now. The goal of this study is to devise a strategy to guarantee the quality of the survey statistics to perform for Korean agricultural occupational disease and injury statistics. The survey used a stratified multistage cluster sampling design and adopted the face-to-face interview method. We introduce some practical activities to assure the survey quality and show specific survey quality numbers, such as sample substitution rate, response rate, number of input errors, number of logical errors, etc.

이동 통신 단말기에서의 음향 반향 제거기에 관한 연구

姜鉉宇 江南大學校産學技術硏究所 1999 산학기술연구소논문집 Vol.- No.8

Dual-Level Biomemory Device Composed of Cytochrome c/DNA/Myoglobin Heterolayer

Kan, Stanislav,Yoon, Jinho,Chung, Yong-Ho,Lee, Taek,Min, Junhong,Choi, Jeong-Woo American Scientific Publishers 2016 Journal of nanoscience and nanotechnology Vol.16 No.8

<P>In this study, heterolayer composed of cytochrome c/DNA/myoglobin is fabricated for the demonstration of dual-level biomemory device. Metalloprotein and single stranded DNA are conjugated via chemical linkage, and then two different kinds of conjugates are connected by DNA hybridization which can provide stable and selective combination to form heterolayer on gold substrate. To verify the conjugation of metalloprotein and single stranded DNA, sodium dodecyl sulfate polyacrylamide gel electrophoresis and ultraviolet-visible spectroscopy are used. Morphological change by the heterolayer formation is investigated by atomic force microscopy. Cyclic voltammetry is used to investigate the electrochemical property of heterolayer. Dual-level memory functions are achieved by multi-potential step chronoamperometry. From results, heterolayer is well fabricated by DNA hybridization, and dual-level memory functions are well demonstrated with improved memory density. The proposed dual-level biomemory device can provide new approaching method to fabricate bioelectronic devices with high selectivity and functionality.</P>

Stromal vascular fraction (SVF) and Angiopoietin-1 Variant Rescues Erectile Function by Enhancing Endothelial Regeneration in the Streptozotocin-Induced Diabetic Mouse

Woo Jean, Kim(김우진),Hai-Rong Jin,Jae Sook Song,Min Ji Choi,Munkhbayar Tumurbaatar,Sun Hwa Shin,Guo Nan Yin,Gou Young Koh,Ji-Kan Ryu,Jun-Kyu Suh 한국실험동물학회 2013 한국실험동물학회 학술발표대회 논문집 Vol.2013 No.2

Unconventional pore and defect generation in molybdenum disulfide: application in high-rate lithium-ion batteries and the hydrogen evolution reaction.

Zhang, Kan,Kim, Hwan-Jin,Lee, Jeong-Taik,Chang, Gee-Woo,Shi, Xinjian,Kim, Wanjung,Ma, Ming,Kong, Ki-jeong,Choi, Jae-Man,Song, Min-Sang,Park, Jong Hyeok Wiley-VCH 2014 CHEM SUS CHEM Vol.7 No.9

<P>A 2H-MoS2 (H=hexagonal) ultrathin nanomesh with high defect generation and large porosity is demonstrated to improving electrochemical performance, including in lithium-ion batteries (LIBs) and the hydrogen evolution reaction (HER), with the aid of a 3D reduced graphene oxide (RGO) scaffold as fast electron and ion channels. The 3D defect-rich MoS2 nanomesh/RGO foam (Dr-MoS2 Nm/RGO) can be easily obtained through a one-pot cobalt acetate/graphene oxide (GO) co-assisted hydrothermal reaction, in which GO, cobalt and acetate ions are co-morphology-controlling agents and defect inducers. As an anode material for LIBs, Dr-MoS2 Nm/RGO has only a 9% capacity decay at a 10?C discharge rate versus 0.2?C with stable cyclability at the optimized composition (5?wt% RGO to MoS2 and 2?mol% Co to Mo), and significantly achieves 810?mA?h?g(-1) at a high current density of 9.46?A?g(-1) over at least 150?cycles. Moreover, Dr-MoS2 Nm/RGO exhibits superior activity for the HER with an overpotential as low as 80?mV and a Tafel slope of about 36?mV per decade. In contrast to the MoS2 nanosheet/RGO (MoS2 Ns/RGO), which is synthesized in the absence of cobalt ions, Dr-MoS2 Nm/RGO provides high interconnectivity for efficient lithium-ion transport, and rich defects as electrochemically active sites. DFT is used to prove the existence of rich defects due to anion replacement to become a Co-Mo-S atomic structure, releasing inert basal planes to active sites.</P>

소득세 법정세율과 실효세율 격차에 대한 연구

홍우형(Woo-Hyung Hong),강성훈(Sung Hoon Kan) 한국재정학회(구 한국재정·공공경제학회) 2018 재정학연구 Vol.11 No.2

본 연구는 한국을 포함한 7개 국가들의 소득세 법정세율과 실효세율의 격차(세 율갭)를 국제적으로 비교하여, 현행 우리나라 소득세 체계의 문제점을 진단하고 이에 대한 정책적 대안을 검토하고자 하였다. 연구 결과, 한국의 경우 세율갭의 크기와 잠재적 세수손실 규모가 다른 주요국에 비해 매우 큰 것으로 나타났다. 특히 한국의 근로소득세에서 중상위 소득계층의 세율갭이 매우 큰 경향이 나타났는데, 이는 실질적인 과세대상이 되어야 할 중상위 소득계층에게 과도하게 소득세 공제제도 혜택이 주어지기 때문으로 판단된다. 이러한 문제에 대한 개선 방안을 모색하기 위해 정책 시뮬레이션을 시행한 결과, 근로소득세액공제, 특별세액공제와 같은 비용성 공제제도의 존재가 중상위계층의 세율갭을 증가시키고 있는 것으로 나타났다. 이에 본 연구의 결과는 비용성 공제제도를 축소하는 것을 통해 세율갭의 문제를 정상화할 수 있다는 것을 시사한다. This paper examines how effective income tax rates differ significantly from statutory income tax rates depending on the income bracket in South Korea. In this paper, we find evidence that the gap between effective income tax rates and statutory income tax rates is significantly large in the middle and upper income bracket in South Korea, as compared to other countries. This is because the tax deductions and credits are quite large in the middle and upper income bracket. Also, our policy simulation results show that Employment Income Tax Credit and Special Tax Credit result in expanding the gap between income effective tax rates and statutory tax rates for the middle and upper income bracket. Our results suggest that it is necessary to redesign the tax deduction and credit system to maintain the progressivity in the individual income tax system.

Mesoscopic effects in a single-mode Datta-Das spin field-effect transistor

Lee, Hyun-Woo,Ç,alış,kan, S.,Park, Hyowon American Physical Society 2005 Physical review. B, Condensed matter and materials Vol.72 No.15