• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.33 no.2
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• pp.171-187
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• 2023

Objectives: Aircraft cabin cleaning work is characterized by being performed within a limited time in a narrow and enclosed space. The objective of this study was to evaluate the exposure levels to dust, ultra fine dust(PM2.5) and black carbon(BC) among aircraft cabin cleaners. Methods: Active personal air sampling for respirable dust(n=73) and BC(n=47) was conducted during quick transit cleaning(cabin general and vacuum-specific) and seat cover replacement and total dust and PM2.5 were area-air-sampled as well. Also, size distribution of particle was identified with the cleaning workers targeted. Dusts were collected with PVC filters using gravimetric analysis. The concentration of PM2.5 and the particle size distribution were measured with real-time direct reading portable equipment using light scattering analysis. The concentration of BC was measured by aethalometer(filter-based real-time light absorption analysis instrument). Results: The geometric mean of respirable dust was the highest at vacuum cleaning as 74.4 ㎍/m³, following by replacing seat covers as 49.3 ㎍/m³ and cabin general cleaning as 47.8 ㎍/m³ . The arithmetic mean of PM2.5 was 4.83 ~ 9.89 ㎍/m³ inside the cabin, and 28.5~44.5 ㎍/m³ outside the cabin(from bus and outdoor waiting space). From size distribution, PM_2.5/PM₁₀ ratio was 0.54 at quick transit cleaning and 0.41 at replacing seat covers. The average concentration of BC was 2~7 ㎍/m³, showing a high correlation with the PM2.5 concentration. Conclusions: The hazards concentration levels of aircraft cabin cleaners were very similar to those of roadside outdoor workers. As the main source of pollution is estimated to be diesel vehicles operating at airports, and it is necessary to replace older vehicles, strengthen pollutant emission control regulations, and introduce electric vehicles. In addition, it is necessary to provide as part of airport-inftastructure a stable standby waiting space for aircraft cabin cleaners and introduce a systematic safety and health management system for all workers in the aviation industry.

• Advances in aircraft and spacecraft science
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• v.5 no.4
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• pp.477-498
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• 2018

The main goal of this article is to validate a methodological process in Actran MSC Software, that is based on the Finite Element Method, to evaluate the comfort in the cabin of a regional aircraft and to study the noise and vibrations reduction through the fuselage by the use of innovative materials. In the preliminary work phase, the CAD model of a fuselage section was created representing the typical features and dimensions of an airplane for regional flights. Subsequently, this model has been imported in Actran and the Sound Pressure Level (SPL) inside the cabin has been analyzed; moreover, the noise reduction through the fuselage has been evaluated. An important investigation and data collection has been carried out for the study of the aircraft cabin to make it as close as possible to a real problem, both in geometry and in materials. The mesh of the structure has been built from the CAD model and has been simplified in order to reduce the number of degrees of freedom. Finally, different fuselage configurations in terms of materials are compared: in particular, aluminum, composite and sandwich material with composite skins and poroelastic core are considered.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.25 no.4
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• pp.101-110
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• 2017

This research identifies the relation between the quality of cabin service(personnel and material services) in Korean low-cost airlines and resulting customer satisfaction and loyalty. Its aim is to provide low-cost airlines' international flights with basic information when building strategies, and to suggest a strategic implication for an original and competitive cabin service policy that can enhance customer retention. As a result of the analysis, first, hypothesis 1 on relation between the quality of Korean low-cost airlines' cabin service and customer satisfaction was all valid. Moreover, it was coherent with the results of previous researches. Second, hypothesis 2 on relation between the quality of Korean low-cost airlines' cabin service and customer satisfaction was also valid and coherent with previous studies. Third, hypothesis 3 on relation between customer satisfaction and loyalty was valid and coherent with existing studies. Consequently, this research suggests that in order to achieve the continuous retention of loyal customers through customer satisfaction, the quality of personnel and material service has to be considered primarily. In addition to that, this research also suggests that the original and competitive service marketing of low-cost airline is necessary for an airline to continue its profit-making.

• Journal of Power System Engineering
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• v.16 no.2
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• pp.17-23
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• 2012

The steady three-dimensional computational thermal flow analysis using standard k-${\varepsilon}$ turbulence model was carried out to investigate the heat transfer characteristics of a cabin cooler for a commercial vehicle. The heat exchanging method of this cabin cooler is to use the cooling effect of a thermoelectric module. In view of the results so far achieved, the air system resistance of a cabin cooler is about 12.4 Pa as a static pressure, and then the operating point of a cross-flow fan considering in this study is formed in the comparatively low flowrate region. The air temperature difference obtained from the cold part of an thermoelectric module is about $26^{\circ}C$, and the cooling water temperature difference obtained from the hot part of an thermoelectric module is about $3.5^{\circ}C$.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.23 no.1
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• pp.85-95
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• 2015

A responsibility of superior management in an airline has become enormous due to rapid increase of airline's organization and its network. Even though a leadership of superior management is believed to be an important factor, it is almost impossible for management to be responsible for all the areas of an airline organization. This is why leadership should be go down to working level people. Self-leadership means that working level people possess leadership, delegated by their superior persons, and improve their work environment with the leadership as well as related right and responsibility. This paper has tried to find out the components of self-leadership perceived by foreign cabin crews and analyzed the impact of self leadership into airline's organizational effectiveness. Based on empirical research results, this paper would suggest administrative and operational implications of managing foreign cabin crews in K-airline. It was found out foreign cabin crews perceive that self reward and self evaluation have a positive impact on self observation factor. The self observation factor has a significant effect on self goal. The self goal is analyzed as a major factor which results in organizational effectiveness.

• International Journal of Naval Architecture and Ocean Engineering
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• v.10 no.4
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• pp.439-449
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• 2018

In this paper, multi-objective optimization of a multi-bubble pressure cabin in the underwater glider with Blended-Wing-Body (BWB) is carried out using Kriging and the Non-dominated Sorting Genetic Algorithm (NSGA-II). Two objective functions are considered: buoyancy-weight ratio and internal volume. Multi-bubble pressure cabin has a strong compressive capacity, and makes full use of the fuselage space. Parametric modeling of the multi-bubble pressure cabin structure is automatic generated using UG secondary development. Finite Element Analysis (FEA) is employed to study the structural performance using the commercial software ANSYS. The weight of the primary structure is determined from the volume of the Finite Element Structure (FES). The stress limit is taken into account as the constraint condition. Finally, Technique for Ordering Preferences by Similarity to Ideal Solution (TOPSIS) method is used to find some trade-off optimum design points from all non-dominated optimum design points represented by the Pareto fronts. The best solution is compared with the initial design results to prove the efficiency and applicability of this optimization method.

• 한국항공운항학회:학술대회논문집
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• 2015.11a
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• pp.198-211
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• 2015

Aviation industry, which is highly dependent on human resources, emphasizes airline's human resources management and performance check because quality of services provided to customers is closely related to airline's employees. Because roles of cabin crews take a significant portion of services provided to customers, airlines and cabin crews represent an inseparable relationship. Attitudes of cabin crews who plays the role of facing and dealing with customers directly in the process of providing flight related services are an essential factor that determines an image of an airline and actually have significant impact on the performance as well. By increasing performance satisfaction of cabin crews, organizational loyalty can be strengthened and such successful human resources management could have a positive effect on increasing customer satisfaction as well as revenues. From corporate's perspective, performance satisfaction of an employee is a crucial factor that decides the quality of service provided to customers that supports employee retention as well as client retention. This can eventually lead to organization loyalty that can positively affect overall work performance. Thus if corporates put efforts in and invests to improve and develop favorable attitudes and service quality within employees, performance satisfaction and organizational goals will be more effectively achieved.

• Journal of Drive and Control
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• v.10 no.2
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• pp.23-29
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• 2013

The excavator is used in a variety of construction environments. There are many kinds of risk like falling rocks or harmful dust. The excavator cabin protects the operator not only from these harmful environments but also provides a comfortable working environment. By the way, the excavator cabin consumes a lot of energy for cabin air conditioner. For this reason, the research is required to reduce energy consumption. This study suggests the air conditioning system for excavator using forced exhaust. First, the forced exhaust system simulated by AMESim tool and surveyed the applicability. Using AMESim simulation, it was investigated the effect of cabin inside temperature by intake flow rate and intake air temperature. The experiment executed using the 1.5 ton excavator and field tested according to the intake flow rate. Finally, verified the applicability on the air conditioning system for excavator using forced exhaust.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.21 no.3
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• pp.65-77
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• 2013

A high brand reputation of a airline means the airline is preferred by passengers because of its unique services being even better than others. This is why airline's specialized services are important in that those services would create a new brand value and build up the airline's brand image, being enable to have competitive advantage over other airlines, to provide satisfied services, to have a mutual trust between passengers and the airline and to create customer's loyalty. A-Airline have been trying to give passengers a joy of flight by providing its customized and specialized cabin services out of airlnes' stereo-typed services.Therefore this paper will find out how their satisfaction of the cabin services have a positive impact on customer loyalty through brand image, brand reputation, brand identity and brand attraction. Those services would not only contribute to upgrade A-airline's corporate image but show the way to which the cabin service is heading also.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.20 no.3
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• pp.44-50
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• 2012

The noise reduction is important one of considerations in the process of a civil aircraft development program. External noise sources are classified into an air-born source and a structure-born source. Among these noise sources, the most affected noise source into a cabin is the air-born noise source from an engine or propeller. The external noise is transmitted into the cabin through the fuselage structure of airplane which are composed of an fuselage structure, an interior trim panel and an acoustic insulation layer between an fuselage structure and an interior trim panel. Therefore, appropriate fuselage structure and acoustic insulation layer is very important to reduce the internal noise level. In this paper, the vibro-acoustic coupled analysis of the cabin noise of the 80~90 seats regional turboprop aircraft is carried out to validate the acoustic analysis method using Direct BEM and FEM. The sound pressure level onto the fuselage skin is acquired by fan-source noise analysis using BEM, and which sound pressure is used as acoustic noise source in vibro-acoustic noise analysis for cabin noise analysis using FEM.