• Journal of IKEEE
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• v.28 no.3
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• pp.243-252
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• 2024

In this paper, we proposed a performance improvement to replace the aged intercom of military aircraft with a new intercom ICS, and briefly designed and presented a interface block diagram and electrical wiring path for the connection between the new intercom ICS and the other avionics equipment. However, due to the absence of a guide necessary for the proposed design, this paper derived 15 main design elements by using the QFD technique based on the military aircraft airworthiness certification criteria and military aircraft work instructions. As a result, it is meaningful that the interface block diagram, wiring path diagram, and the 15 main design elements proposed in this paper can be applied as an electrical system design guide for the performance improvement of the aged military intercom in the future.

• The Journal of the Korea Contents Association
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• v.13 no.1
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• pp.294-299
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• 2013

This study has investigated the effect of intentional contact through the intercom during MRI scans on the decrease of anxiety in patients. The results obtained through the test group and control group are as follows. 1. The homogeneity of the anxiety score before the scan between the two groups was not acknowledged, hence a significant result could not be deduced. 2. Intentional contact through the intercom displayed decreasing results rational discomfort (t=-2.214, p=.031). 3. Intentional contact through the intercom displayed decreasing results of (t=-3.722, p=.000), and fear (t=-2.74, p=.009). 4. Intentional contact through the intercom displayed decreasing results of heart rate (t=-4.180, p=.000). In conclusion, the attempt to perform MRI scans with intentional contact through the intercom did not display significant effect on the blood pressure of the subject after the scan, however, displayed a decrease in objective and rational discomfort, as well as the heart rate, another vital sign. Accordingly, it is judged that intentional contact through the intercom can be used as an effective substitutive treatment method in patient care and test, as it relieves psychological tension in the patient and allows the patient to feel stability.

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

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.49 no.6
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• pp.497-504
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• 2021

This paper presents improvement of the reception noise suppression method during formation flights of aircraft. Since aircraft communication equipment is very important for flight mission and safety to perform the functions of internal/external communications, it is required to implement noise-free, clean communication quality, and transmitting/receiving functions. Therefore, the FTA (Fault Tree Analysis) analysis and failure search were performed on the reception noise, and the internal noise of the intercom that affected the reception noise and the none-transmition phenomenon was identified. We changed the multiple grounds of the intercom to a single ground and applied an improved method of filtering the DC Offset voltage. As a result, the voice quality of the communication system of the aircraft was improved through the reduction of the reception noise during formation flights, and it was verified by ground and flight tests.

• Journal of Aerospace System Engineering
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• v.11 no.6
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• pp.1-9
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• 2017

The ICS, Intercom is the equipment which mixes and distributes the audio signal from other LRUs and plays the Voice Messages. Henceforth, it is of immense contributory importance to the pilots. Especially, the audio routing, which controls On/Off mode of each audio channel, is significant in executing a pilots' mission. But the audio routing process is quite complicated as it has the interface combination of many control signals. Underthecondition, the exceptional handling becomes difficult, which decreases maintainability and productivity. In the present work, to prevent such a situation, the author suggests amethodology,whichwillhavealower impact when the software is changed and provides high maintainability and productivity for audio routing processing.

• Journal of IKEEE
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• v.19 no.3
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• pp.415-423
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• 2015

The DO-178C guide, which is referenced as the software development guide when a certification of the airworthiness in the commercial airplane is acquired by FAA in US, is recently referenced for the local military aircraft airworthiness. This indicates that when the auditor of the military aircraft airworthiness looks over the software development documents, the auditor reviews if all of the documents are verified in accordance with the DO-178C guide. However, when we developed the military aircraft intercom, We developed its control software in accordance with the CMMI level 3, since there were no requirements for the compliance of the DO-178C guide. Therefore, When we consider the airworthiness of this intercomm system, The analysis for how much the software development based on the CMMI level 3 is different from the DO-178C guide is needed to prepare the essential software documents additionally. Thus, This study analyzes the differences between CMMI level 3 and DO-178C guide and provides that which data on the CMMI level 3 is necessary for the compliance of the aircraft airworthiness comparing with the DO-178C. The analyzed result can be applied at the software development of the other military aircraft avionics equipment based on the CMMI model environment considering the compliance of the military aircraft airworthiness.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.41 no.12
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• pp.1002-1010
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• 2013

Intercom System(ICS) of Korean Utility Helicopter(KUH) is an essential equipment for pilot to perform flight mission and it consists of communication system of KUH with VHF-FM radio set and U/VHF-AM radio set. It provides pilots and crews with internal communication, external communication and audible alarm. It has function of controlling volume and selecting two communication modes, normal mode and backup mode. This paper summarizes pilot comments in flight test which are classified by cause of occurrence and the troubleshooting process about each comment. It also describes design improvements which was derived from troubleshooting and suggests verification results of flight test.

• Journal of Advanced Navigation Technology
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• v.26 no.5
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• pp.358-364
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• 2022

The Inter Communication System for avionics is in charge of processing all voice signals that internal calls between Pilot and Co-pilot, internal calls between Pilots and Crews, external calls through communication equipment such as Ultra/Very High Frequency Receiver/Transmitter(U/VHF RT), audio signal monitoring for navigation and mission equipment such as VHF Omnidirectional Range/Instrument Landing System(VOR/ILS), Tactical Air Navigation(TACAN), audio signal output for voice recording to Flight Data Recorder(FDR) and Data Transfer System(DTS), and warning/caution audio signal generate about the status and threat of aircraft. Because Inter Communication System for avionics is sensitive to noise in the case of analog audio signals, a redundant design that can protect audio signal from electromagnetic noise inside/outside of aircraft is required for the mission of pilots and crews. In this paper, Normal/Back-up operation mode and redundancy design plan based on digital method for the redundancy of the digital Inter Communication System for avionics and manufacturing, verification results are described.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.4 no.2
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• pp.83-90
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• 1992

A wave prediction model of DP type with shallow water effects is presented. An intercom-parison study of the shallow water wave models has been made to verify applicability of this model which has source functions of Inoue, propagation scheme by Gadd and dissipation functions due to bottom friction. The energy distribution shows reasonable results and for the bottom friction JONS-WAP decay function seems to be more appropriate.

• Proceedings of the KIEE Conference
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• 1995.07b
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• pp.931-933
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• 1995

In this paper, we develop protype of wierless recognition system using low frequency. Application of this system is very broad. Namely, High-way toll gate, animal management, parking system and industral automation et al. This system is composed of controller, decoder and tag. Controller is personal PC, decoder is signal module and tag is mobile corresponder module. Modulation is ASK, 4,800bps, frequency is 120/60kHz and transmission length is about 80cm. And now we study improvement of stability, low power consumption, compact of tag and transmission length improvement.