• Korean Journal of Agricultural Science
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• v.51 no.3
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• pp.295-305
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• 2024

Due to the environment of irregular soil characteristic for agricultural fields, dynamic characteristic occurs in the tractor cabin during agricultural operations. Operator's fatigue is increased, and operation performance is decreased by these irregular environment conditions. This study was conducted to measure and analyze the dynamic characteristic of a tractor cabin, a major agriculture machinery, during agricultural operations. The specification of tractor used in the study was a 95 kW class tractor. To analyze the dynamic characteristics of the tractor cabin, the main agricultural operations, plow tillage and rotary tillage, were selected. To measure data of dynamic characteristic of the cabin, which continuously changes during operations, an Ellipse Series INS (inertia navigation system) with a built-in IMU (inertia measurement unit) was attached to the center of gravity of the cabin. During field test, the gear stages of plow tillage were B4 (4.3 km·h^-1) and B5 (5.6 km·h^-1), and the gear stages of rotary tillage were A3 (3.3 km·h^-1) and A4 (4.2 km·h^-1), which are the most commonly used. To analyze dynamic characteristic such as roll and pitch during operations according to the gear stages. As a result, the dynamic characteristics of pitch increased more than the dynamic characteristics of roll as the travel speed increased, and the dynamic characteristics of both agricultural operations were in the range of 2 to 5°.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1997.10a
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• pp.445-450
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• 1997

Optimal design of a piezoelectric smart structure is studied for cabin noise control. A cubic shaped acoustic cavity with a flat plate which covers one side is taken as the problem. The sensor signal is returned to the actuator through a negative gain. The acoustic cavity is modeled using the modal approach which represents the pressure fields in the cavity as a sum of mode shapes of the cavity with unknown coefficients. By using orthogonality of the mode shapes of the cavity, finite element equation for the structure with the influence of the acoustic cavity is derived. The objective function is the average pressure at a certain region, so-called silent zone, in the cavity and the design variables are the locations and sizes of the piezoelectric actuator and sensor. The optimal design is performed at several frequencies and the results show a remarkable noise reduction.

• Journal of Advanced Navigation Technology
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• v.28 no.5
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• pp.698-705
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• 2024

In recent years, the aircraft interior industry has been rapidly evolving, incorporating advanced information technology (IT) elements as competition in the aviation industry intensifies. In Korea, a display system for aircraft, called cabin display system (CDS), is being developed in collaboration with Boeing. This paper discusses the design and implementation of cabin display system remote control software (CDS RCS), a remote control software for the CDS. CDS RCS was developed by applying the aircraft data load process developed in-house using the ARINC-615A standard, and the communication protocol between devices applies the MQTT protocol. Unlike existing CDS control software, CDS RCS is designed as an MQTT client and can operate independently of other MQTT clients. It is also developed for android-based devices, which can be easily installed on personal terminals, and is expected to greatly enhance the convenience of flight attendants.

• Journal of KSNVE
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• v.8 no.3
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• pp.428-434
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• 1998

Optimal design of a piezoelectric smart structure is studied for cabin noise control. A cubic shaped acoustic cavity with a flat plate which covers one side is taken as the problem. The sensor signal is returned to the actuator through a negative gain. The acoustic cavity is modeled using the modal approach which represents the pressure fields in the cavity as a sum of mode shapes of the cavity with unknown coefficients. By using orthogonality of the mode shapes of the cavity, finite element equation for the structure with the influence of the acoustic cavity is derived. The objective function is the average pressure at a certain region, so-called silent zone, in the cavity and the design variables are the locations and sizes of the piezoelectirc actuator and sensor. The optimal design is performed at several frequencies and the results show a remarkable noise reduction. To see the robustness of the optimally designed result, the configuration is used to examine the noise reduction at different frequencies. By adjusting the gain at each frequencies, it is possible to reduce the noise in comparison with the result when the actuator is not activated.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.01a
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• pp.5-6
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• 2021

교통수단으로서의 항공기 이용 고객의 증가로 인해 객실 내에서 제공되는 기내 서비스는 항공사의 경쟁력을 결정하는 중요한 요소 중 하나이다. 그러나 현재와 같이 승무원이 비행 중 기내식 등의 서비스 제공을 위해 카트를 직접적으로 이동시키며 제공하는 서비스는 여러 불편한 요소로 인해 서비스의 질을 감소시킬 수 있다. 이를 위해 본 논문에서는 카메라 센서와 초음파 센서를 이용하여 기내에서 활용 가능한 서비스용 스마트 카트를 설계한다. 설계하는 스마트 카트는 승무원의 이동에 따라 대체 거리를 측정해 사용자와의 일정 거리를 유지하는 동시에 승객의 호출 신호에 따라 승객의 자리로 자동 이동하여 서비스 제공이 가능하게 하는 것을 목표로 한다. 기내 서비스용 스마트 카트는 승무원의 노동 강도 감소와 더불어 항공기 객실 서비스의 질적 향상에 기여할 뿐만 아니라 저가 항공사의 경비 절감에도 기여할 수 있다.

• Journal of Advanced Navigation Technology
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• v.25 no.6
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• pp.492-497
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• 2021

Smart Security is the global initiative of Airports Council International in collaboration with airports, airlines and governmental agencies. Its main objective is to create a step change in passenger and cabin baggage screening, escalating security costs and constantly evolving threats. Incheon International Airport should adopt and deploy smart security systems not only to strengthen aviation security but also increase passenger's experiences and operational efficiency by way of seamless security screening that it will lead to establish the best security environment to prevent terrorism and acts of unlawful interference.

• Journal of Advanced Navigation Technology
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• v.27 no.5
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• pp.610-620
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• 2023

The interest in the aircraft interior market is gradually growing due to technological development based on the 4th industrial revolution and competition for airlines to attract customers, and as part of that, Cabin Display System (CDS) for FAA Part.25 civil aircraft is being developed in Korea. The CDS is a system that provides various multimedia services to passengers by utilizing Flexible and Transparent Organic Light Emitting Diodes (OLED) with Integrated Display Processing Module (IDPM). This paper presents a new method for efficient Data Load Process of large-sized files and deals with their implementation and performance. The results of this study are expected to be applied to Data Load Process development of avionics that require reliable large-capacity file transmission along with reducing the costs of development compared to existing ARINC-615A.

• Journal of Biosystems Engineering
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• v.43 no.4
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• pp.255-262
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• 2018

Purpose: To obtain the dynamic characteristics (spring stiffness and damping coefficient) of a rubber mount supporting a tractor cabin in order to develop a simulation model of an agricultural tractor. Methods: The KS M 6604 rubber mount test method was used to test the dynamic characteristics of the rubber mount. Of the methods proposed in the standard, the resonance method was used. To perform the test according to the standard, a base excitation test device was constructed and the accelerations were measured. Results: Displacement transmissibility was measured by varying the frequency from 3-30 Hz. The vibration transmissibility at resonance was confirmed, and the dynamic stiffness and damping coefficient of the rubber mount were obtained. The front rubber mount has a spring constant of 1247 N/mm and damping ratio of 3.27 Ns/mm, and the rear rubber mount has a spring constant of 702 N/mm and damping ratio of 1.92 Ns/mm. Conclusions: The parameters in the z-direction were obtained in this study. In future studies, we will develop a more complete tractor simulation model if the parameters for the x- and y-directions can be obtained.

• Proceedings of the Korean Society of Computer Information Conference
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• 2022.07a
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• pp.429-430
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• 2022

현재 코로나로 인한 각 나라의 입국 제한이 사라지면서 국내외 여행 예약률 증가에 따라 그만큼 비행기 예약도 늘어나고 있다. 그런데 객실 승무원의 근무 환경은 매우 열악하기 때문에 육체적, 정신적 피로를 누적되게 한다. 이는 승객에게 양질의 서비스를 제공할 수 없게 하고 안전사고를 대처하는 데 있어 문제가 된다. 본 논문은 객실 승무원이 스마트폰 앱을 이용하여 편리하게 객실 상황을 확인하고, 원격 제어하며 서빙카트를 조작하여 승객의 주문에 대한 서비스를 제공하는 '원격제어가 가능한 비행기 객실 관리 시스템'을 제안한다. 이 시스템을 이용함으로써 객실 승무원은 객실 상황을 판단하여 즉각적인 대처를 할 수 있고, 항공기 효율적 운용을 위한 안전성과 정시성을 확보하는 데 도움이 될 것이다.

• Proceedings of the KSR Conference
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• 2011.05a
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• pp.1563-1571
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• 2011

In the commercial trains, there are monitors hung on the ceiling which simply display broadcasted contents so a passenger in a cabin has only one choice of passively watching them or not. To lead the application of IT in railway, keep a passenger from tedious journey, or help a passenger having a productive time, an MCS(Multimedia Contents System) was analyzed, designed, and implemented. A passenger can select and use a content from a smart terminal that is attached at the passenger's seat. A smart terminal is one that has its own memory and processor to handle informations and interact with a user. In this paper, the contents, such as train schedule, transfer information, traveling information, e-book, TV, music, and game, that the MCS can provide were introduced. To validate the applicability of the MCS on a next generation high-speed train, a testing environment will be set on a pre-production car and tested. The successful installation of the MCS will boost up the competitive power of the next generation train in the world market.