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811.
Seunghwan Kim Jinkyun Park Sangyong Han Hanjeom Kim 《Journal of Loss Prevention in the Process Industries》2010,23(4):539-548
Communication problems have long been regarded as one of the biggest causes of trouble in many workplaces. Consequently, as a part of human error analysis, extensive research has been conducted into communication. The existing research indicates that maintaining reliable communication is essential to securing the safety of a large and complex process or system. To observe the characteristics of communication, verbal protocol analysis using speech act coding schemes have been widely used in much of the related research. However, as existing speech act coding schemes do not provide a sufficient analysis information other than the distribution rate of each pattern, the development of extended communication categories is essential to overcoming the weaknesses of protocol analysis. The objective of this study is to suggest an extended speech act coding scheme and to elucidate the communication pattern characteristics of an operator’s conversation during a simulated abnormal condition in a nuclear power plant (NPP). The expected results are that conversation between operators using Multi-Way communication can increase the accuracy of information delivery and eliminate the possibility of improper operation. Therefore, communication quality control can be regarded as an important research area to minimize the occurrence of human error during communication. From this perspective, the results of this study would be a good starting point to improving the quality of communications in the workplace. 相似文献
812.
Eugene Kim Katarzyna Turkiewicz Sylvia A. Zulawnick Karen L. Magliano 《Atmospheric environment (Oxford, England : 1994)》2010,44(26):3095-3100
PM2.5 (particulate matter less than 2.5 μm in aerodynamic diameter) speciation data collected between 2003 and 2005 at two United State Environmental Protection Agency (US EPA) Speciation Trends Network monitoring sites in the South Coast area, California were analyzed to identify major PM2.5 sources as a part of the State Implementation Plan development. Eight and nine major PM2.5 sources were identified in LA and Rubidoux, respectively, through PMF2 analyses. Similar to a previous study analyzing earlier data (Kim and Hopke, 2007a), secondary particles contributed the most to the PM2.5 concentrations: 53% in LA and 59% in Rubidoux. The next highest contributors were diesel emissions (11%) in LA and Gasoline vehicle emissions (10%) in Rubidoux. Most of the source contributions were lower than those from the earlier study. However, the average source contributions from airborne soil, sea salt, and aged sea salt in LA and biomass smoke in Rubidoux increased.To validate the apportioned sources in this study, PMF2 results were compared with those obtained from EPA PMF (US EPA, 2005). Both models identified the same number of major sources and the resolved source profiles and contributions were similar at the two monitoring sites. The minor differences in the results caused by the differences in the least square algorithm and non-negativity constraints between two models did not affect the source identifications. 相似文献
813.
Sang-Yul Kim Nobutoshi Tanaka Toshihiko Matsuto Yasumasa Tojo 《Waste management & research》2005,23(3):220-229
Two new pre-treatment methods (water-washing/carbonation and carbonation/phosphate stabilization) of municipal solid waste (MSW) incinerator residues were evaluated by column leaching tests under aerobic conditions and anaerobic conditions (which were changed to aerobic conditions after 10 months). A mixture of bottom ash and fly ash (5:1 ratio) was pre-treated using each method. Shredded incombustible residues (SIR) were added to each ash preparation in proportions similar to the ratios present in landfills. For comparison, landfill wastes typical of Japan, namely, a mixture of bottom ash, chelating-pre-treated fly ash, and SIR, were also examined. Leachate samples were collected periodically and analysed over a 15-month period. When compared with chelating pretreatment, both water-washing/carbonation and carbonation/ phosphate stabilization reduced the leaching of Pb, Al, and Cu by about one to two orders of magnitude. Moreover, the initial concentrations of Ca and Pb in leachates from column of water-washing/carbonation were 56-57% and 84-96% less than those from the column of carbonation/phosphate stabilization. Therefore, water-washing/carbonation was considered to be a promising approach to obtain early waste stabilization and to reduce the release of heavy metals to near-negligible levels. The leaching behaviour of elements was also discussed. 相似文献
814.
Chi Kim Lim Hui Han Bay Chin Hong Neoh Azmi Aris Zaiton Abdul Majid Zaharah Ibrahim 《Environmental science and pollution research international》2013,20(10):7243-7255
In this study, the adsorption behavior of azo dye Acid Orange 7 (AO7) from aqueous solution onto macrocomposite (MC) was investigated under various experimental conditions. The adsorbent, MC, which consists of a mixture of zeolite and activated carbon, was found to be effective in removing AO7. The MC were characterized by scanning electron microscopy (SEM), energy dispersive X-ray, point of zero charge, and Brunauer–Emmett–Teller surface area analysis. A series of experiments were performed via batch adsorption technique to examine the effect of the process variables, namely, contact time, initial dye concentration, and solution pH. The dye equilibrium adsorption was investigated, and the equilibrium data were fitted to Langmuir, Freundlich, and Tempkin isotherm models. The Langmuir isotherm model fits the equilibrium data better than the Freundlich isotherm model. For the kinetic study, pseudo-first-order, pseudo-second-order, and intraparticle diffusion model were used to fit the experimental data. The adsorption kinetic was found to be well described by the pseudo-second-order model. Thermodynamic analysis indicated that the adsorption process is a spontaneous and endothermic process. The SEM, Fourier transform infrared spectroscopy, ultraviolet–visible spectral and high performance liquid chromatography analysis were carried out before and after the adsorption process. For the phytotoxicity test, treated AO7 was found to be less toxic. Thus, the study indicated that MC has good potential use as an adsorbent for the removal of azo dye from aqueous solution. 相似文献
815.
Sun-Kyu Kim In-Young Yang David K. Hsu Kil-Sung Lee Kwang-Hee Im 《Journal of Loss Prevention in the Process Industries》2009,22(6):860-863
When propagating in the thickness direction of composite laminates, shear ultrasonic waves are particularly sensitive to layup sequence in the cured CF/Epoxy composite laminates manufactured from unidirectional prepregs and are interacting with the polarization direction of propagating through its thickness. The strength and stiffness in laminates often are attributable to the specific fiber orientation and layup sequence. So the layup orientation greatly influences its properties in a composite laminate. There is a good correlation between the model and the non-destructive ultrasonic technique developed to inspect the sequence error of cured symmetric layups of the laminates. The physical model is based on the decomposition and recombination of shear polarization. Non-destructive evaluation capabilities are highly desirable for reusing unidirectional prepreg sheets. 相似文献
816.
C. David Cooper Brian Kim John MacDonald 《Journal of the Air & Waste Management Association (1995)》2013,63(4):471-476
ABSTRACT A new equation is proposed to predict the lower heating value of hazardous and non-hazardous materials. The equation was developed by a statistical correlation of heating value and composition data for a variety of materials as reported in a number of sources. The model takes into account the carbon, hydrogen, oxygen, chlorine, and sulfur content of the material being combusted. 相似文献
817.
Yong-Ku Kong Andris Freivalds Sung Eun Kim 《International journal of occupational safety and ergonomics》2013,19(3):303-313
To evaluate the effect of handle design characteristics on subjective ratings and pulling forces, meat-hook handles with various handle shapes, sizes, and hook positions were tested in a pulling task. Finger and phalange force data measured by force sensitive resistors and subjective ratings of discomfort were also evaluated. Generally subjects preferred 37-mm double frustum, 30-mm oval handles followed by 30-mm double frustum handles, 37-mm oval, and 45-mm double frustum handles. In the analyses of total pulling force, 37- and 45-mm double frustum handles showed less required pulling force than the others. The averages of finger force contributions to the total pulling force were 27.2, 28.1, 23.9, and 20.8% in order from index to little fingers. The average of phalange force contributions were 28.8, 33.6, and 37.6% for the distal, middle, and proximal phalanges, respectively. The findings illustrate that the pulling finger forces and subjective discomfort ratings were related to the handle shape as well as handle size. 相似文献
818.
Kwang-Jae Kim Sung H. Han Myung Hwan Yun Jiyoung Kwahk 《International journal of occupational safety and ergonomics》2013,19(3):387-406
A systematic modeling approach to describing, prescribing, and predicting usability of a product has been presented. Given the evaluation results of the usability dimension (UD) and the measurement of the product’s design variables, referred to as the human interface elements (HIEs), the approach enables one to systematically assess the relationship between the UD and HIEs. The assessed relationship is called a usability model. Once built, such a usability model can relate, in a quantitative manner, the HIEs directly to the UDs, and thus can serve as an effective aid to designers by evaluating and predicting the usability of an existing or hypothetical product. A usability model for elegance of audiovisual consumer electronic products has been demonstrated. 相似文献
819.
Lee Changmin Zhao Xin Kim Jae Young 《Journal of Material Cycles and Waste Management》2022,24(3):971-979
Journal of Material Cycles and Waste Management - Septage, which is made up of liquid and solid materials pumped from septic tanks, can be a potential co-digestion resource for sewage sludge. This... 相似文献
820.
Lim Dong Kyu Kim Jong wan Kim Jae Kyung 《Environmental science and pollution research international》2022,29(39):59052-59059
Environmental Science and Pollution Research - Big data can be used to correlate diseases and climatic factors. The prevalence of influenza (flu) virus, accounting for a large proportion of... 相似文献