• Journal of Advanced Navigation Technology
• /
• v.28 no.3
• /
• pp.309-314
• /
• 2024

Avionics Intercom performs communication between pilot, co-pilot and crews in aircraft. In the case of developing intercom in the aircraft modification development project, additional communication equipment or avionics equipment is configured to link the existing intercom with the headsets. Newly designed intercom needs a configuration that receives an aircraft headset microphone and transmits a microphone signal to the existing intercom, and these signals are required to perform signal quality above a certain level. To satisfy these requirements, microphone transmitter circuit has designed and tested, but quality factors of signal were not suitable. In order to avoid the issue, eliminate transmitter and apply signal bridge circuit considered with load effect, and it meets requirements. In this paper, the test results for the signal quality for each configuration are reviewed.

• Bulletin of the Korean Space Science Society
• /
• 2009.10a
• /
• pp.25.4-25.4
• /
• 2009

국내에서는 대한항공이 2006년 8월 17일에, 북극 항공로를 처음으로 운항하기 시작한지 벌써 3년이 넘어서고 있는 현실에서 국내 항공기의 승무원 및 승객 보호를 위한 우주방사선 안전 기준 연구가 시급한 것이 현실이다. 특히 우주방사선 관리의 필요성을 명시한 생활주변방사선 안전관리법안이 현재 국회 심의중이고, 이에 따른 우주방사선 관련 정책 개발 연구 과제를 한국천문연구원 태양우주환경연구그룹에서 진행 중이다. 이 과제의 현재까지의 진행 상황 및 안전조치 방안들에 대한 나름의 제안에 관해서 이번 발표에서 다루어 질 것이다.

• The Journal of the Korea Contents Association
• /
• v.14 no.1
• /
• pp.466-477
• /
• 2014

This research aims to analyze the importance-performance among airline selection attributes using foreign tourists. For this purpose, data were collected from Japanese and Chinese tourists to Korea. Of the various airline selection attributes, four factors were deduced that includes: transport service, accompany service, cabin service and basic service using exploratory factor analysis. This study estimated how important airline selection attributes are and how much are they performed. Also, this study analyzed the ranking among each selection attributes using T-test. The importance-performance analysis showed 'Concentrate Here' in quadrant I, 'Keep up the Good Work' in quadrant II, 'Low Priority' in quadrant III and 'Possible Overkill' in quadrant IV. Quadrant I specifically showed low performance in terms of the following specific attributes: communicative convenience, flight attendant's friendliness, seating preference. As these attributes are deemed significant, airline managers should focus along these areas.

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.27 no.2
• /
• pp.71-78
• /
• 2014

There is a big risk of bullet impact because military rotorcraft is run in the battle environment. Due to the bullet impact, the rapid increase of the internal pressure can cause the internal explosion or fire of fuel cell. It can be a deadly damage on the survivability of crews. Then, fuel cell of military rotorcraft should be designed taking into account the extreme situation. As the design factor of fuel cell, the internal fluid pressure, structural stress and bullet kinetic energy can be considered. The verification test by real object is the best way to obtain these design data. But, it is a big burden due to huge cost and long-term preparation efforts and the failure of verification test can result in serious delay of a entire development plan. Thus, at the early design stage, the various numerical simulations test is needed to reduce the risk of trial-and-error together with prediction of the design data. In the present study, the bullet impact numerical simulation based on SPH(smoothed particle hydrodynamic) is conducted with the commercial package, LS-DYNA. Then, the resulting equivalent stress, internal pressure and bullet's kinetic energy are evaluated in detail to examine the possibility to obtain the configuration design data of the fuel cell.

• Journal of the Korean Society of Radiology
• /
• v.17 no.3
• /
• pp.367-373
• /
• 2023

Aircrews and passengers are exposed to radiation from cosmic rays and secondary scattered rays generated by reactions with air or aircraft. For aircrews, radiation safety management is based on the exposure dose calculated using a space-weather environment simulation. However, the exposure dose varies depending on solar activity, altitude, flight path, etc., so measuring by route is more suggestive than the calculation. In this study, we developed an instrument to measure the cosmic radiation dose using a general-purpose Si sensor and a multichannel analyzer. The dose calculation applied the algorithm of CRaTER (Cosmic Ray Telescope for the Effects of Radiation), a space radiation measuring device of NASA. Energy and dose calibration was performed with Cs-137 662 keV gamma rays at a standard calibration facility, and good dose rate dependence was confirmed in the experimental range. Using the instrument, the dose was directly measured on the international line between Dubai and Incheon in May 2023, and it was similar to the result calculated by KREAM (Korean Radiation Exposure Assessment Model for Aviation Route Dose) within 12%. It was confirmed that the dose increased as the altitude and latitude increased, consistent with the calculation results by KREAM. Some limitations require more verification experiments. However, we confirmed it has sufficient utilization potential as a cost-effective measuring instrument for monitoring exposure dose inside or on personal aircraft.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.38 no.5
• /
• pp.477-481
• /
• 2010

Some rotorcraft fuel tanks are required to be self-sealing and crashworthy for enhancing the survivability of crews. Self-sealing capability prevents the fuel leakage through contacting fuel with self-sealing material when the tank wall is penetrated by projectiles such as bullets. US army established MIL-DTL-27422D which specifies the detail requirements related to gunfire resistant fuel tank especially for military rotorcraft. The Fuel tanks for Korea Helicopter Program have been developed in accordance with MIL-DTL-27422D. The Self-sealing capability of the fuel tanks has been confirmed by the gunfire resistance test which specified on the MIL-DTL-27422D.

• Journal of The Korea Institute of Healthcare Architecture
• /
• v.26 no.3
• /
• pp.7-16
• /
• 2020

Purpose: As communicable disease, COVID-19, pandemic strikes over the world, it is critically bewared that air travel possibly be a major pass way to deliver the infectious disease virus. Especially the airplane could be an unique environment to cultivate the virus spreaders. In order to keep the continuous safe airway as well as the industry, related international associations and organizations have been published the guidelines for the prevention and control the infectious disease through the all aspects of aviation. By reviewing the guidelines, focusing on the in-flight infection prevention and control, this study would not only inform a summary of the international guidelines but also provide an essential and general consideration for related research or guideline study. Methods: Guidelines of 5 major countries are reviewed, which has been seriously influenced by COVID-19 : U.S., Canada, E.U., Australia and China. The items of the guidelines are re-categorized as its similarity and structure by applicable cases. Results: The result of this study shows that each guideline seems to share a major structure and issue such as identifying sick traveler, sick passenger care, and cleaning even though that of China has a different since it used to consider the flight conditions based on 3 levels of infection risk. For sick passenger care, the guidelines includes crew safety, service level, sick passenger isolation, and cleaning. Implications: A published guideline as a public manual could be to prevent and control the in-flight infection efficiently and promptly. It also could provide a confidence of knowledge and educate for all users to prepare the in-flight emergency as well.

• Korean Journal of Occupational Health Nursing
• /
• v.27 no.1
• /
• pp.25-35
• /
• 2018

Purpose: The purpose of this study was to figure out emotional labor, healthy lifestyle, needs for health services of flight attendants and the relationships among needs for health services according to various characteristics of flight attendants. Methods: The participants of this study were 140 flight attendants who work on major and low cost airlines. Data were collected through a questionnaire from 2017 .Jan.~2017. Feb. Data were subsequently analyzed using the SPSS 21 Program. Results: The score of emotional labor was 3.76 surface acting was 3.75 and deep acting was 3.77. The average of healthy lifestyle was 2.41, and the highest was 3.13 of personal relationship and the lowest was 1.91 of eating habits. There is a positive correlation between emotional labor-deep acting and healthy lifestyle. Flight attendants demand health services for physical exercise, stress and emotional labor management, healthy eating habits, emergency treatment, prevention of fatigue, cancer screening, sexual harassment prevention, sex education and etc. Conclusion: These results show that flight attendants need to various interventions for improving healthy lifestyle and reducing emotional labor. It is necessary to develop customized health promotion program suited to their job and general characteristics.

• Journal of the Korean Society for Aviation and Aeronautics
• /
• v.21 no.4
• /
• pp.126-136
• /
• 2013

Aircraft accidents these days, following the mega sizing trend of the aircraft, result in enormous losses of human lives apart from those of property, which cannot be replaced by any means. As most recently, in April 20, 2012, a Boeing 737 passenger plane departed Karachi on an augural flight to Islamabad, Pakistan, crashed close to an express highway on final approach, all 121 passengers and 6 crew members were killed. As such a large number of fatalities have been recorded in aircraft accidents while accident investigation results show that more than 95% of aircraft accidents are now survivable. There are three basic stages in surviving the aircraft accident: surviving the crash impact, the evacuation process and the hostile post evacuation environmental elements. These stages require the cabin crew's expeditious and appropriate actions on the basis of systematic and thorough cabin safety training in order to increase occupants' survivability, along with the passengers' preparedness. In this aspect, this paper examines the issues acting as the impediments to the passenger survival in inflight emergency situations, that are the deficiencies with cabin crew safety training, related performances and the shortcomings in passengers' knowledge on inflight safety information, leading to their inappropriate responses to emergency situations. These issues are analyzed and the root causes are identified, suggesting the resolving countermeasures.

• The Korean Journal of Air & Space Law and Policy
• /
• v.26 no.2
• /
• pp.69-100
• /
• 2011

The penalty clauses of 'Aviation Act' and 'Aviation Safety and Security Act' going into effect now were legislated because the aviation safety is being more influenced by the aviation safety system compared to the ground or maritime transportation and it is possible the aircraft can harm to people and wealth located in the ground as well as threaten the safety of the passengers and crew on board when it is the target of crimes. However, analyzing the current acts, applicable objects and behavioral requirements of some provisions are too general, and they are providing severely high penalties in many clauses without separating applicable objects and behavioral requirements. In addition, there are some critical legislative defects and there is a problem in terms of law-applicable area in the legal system. It is inferred that these legislative problems of the criminal special-law related to the aviation were caused by following reasons; first, aviation security experts or policy-makers than criminal law experts attended more actively in the enactment process, second, the communication among specialist groups were not accomplished well enough.