• The Journal of the Convergence on Culture Technology
• /
• v.8 no.4
• /
• pp.173-179
• /
• 2022

Through the 2014 Donbas conflict and the 2022 Ukraine-Russia war, we are experiencing that the command of the air is no longer only secured by the Air Force. Long-range surveillance reconnaissance and strikes carried out by the Air Force could be replaced by drones and missiles, and the enemy's aerial attacks could be controlled by air defense systems such as Panchir and portable anti-aircraft missiles, allowing ground forces to carry out maneuvers freely. In other words, it is much more advantageous for the air force and the navy to take control of the air through long-distance operations, and the ground forces should support them. Therefore, this study aims to consider the cost-effectiveness aspect of the delivery command of the air; it provides implications for quickly responding to enemy air attacks by developing the air defense weapon system, drones, missiles, precision-guided munitions, etc rather than focusing on expensive fighter jets.

• Journal of the Korean Society of Propulsion Engineers
• /
• v.24 no.4
• /
• pp.12-24
• /
• 2020

The dual-throat nozzle is an extremely effective method in the thrust vectoring control field, utilizing another convergent section to connect with the divergent part of the conventional convergent-divergent nozzle. In the present research, the numerical simulation is conducted to investigate the effects of the injection angle on thrust vectoring performance in a 3D supersonic nozzle. Five injection angles are discussed and core performance variations are analyzed, including the deflection angle, injected mass flow ratio, system resultant thrust ratio, efficiency, Mach number contour and streamline on the symmetry plane, and Mach number contours at different slices. Meaningful conclusions are offered for fighter jet designers.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.43 no.6
• /
• pp.548-556
• /
• 2015

The highly maneuverable fighter aircraft such as F-22, F-16 and F-15have the high maneuverability to maximize the combat performance, whereas the high maneuver characteristics might degrade the pilot's mission efficiency due to fatigue's increase by exposing him to the high gravity and, in the worst case, the pilot could face GLOC (Gravity-induced Loss Of Consciousness). The advanced aerospace company has applied the various technologies to improve the pilot's tolerance to the gravity acceleration, in order to prevent the pilot from entering the situation of the loss of consciousness. Especially, the Anti-G Suit(AGS) equipment to protect the pilot against the high gravity in flight could improve the mission success rate by decreasing the pilot's fatigue in the combat maneuver as well as prevent the pilot from facing GLOC. In this paper, a control algorithm is developed and verified to provide an optimal air pressure to AGS according to the gravity increase during the high performance maneuver. This result is expected, as the key technology, to contribute to the KF-X(Korean Fighter eXperimental), project in the near future.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 2005.05a
• /
• pp.36-43
• /
• 2005

RFID(Radio Frequency IDentification: 라디오 주파수 인식)란 라디오 주파수를 활용해서 무선으로 사물을 인식하는 것을 의미한다. RFID 기술을 구성하는 기본 요소는 태그, 안테나, 리더 등이다. 본 연구에서는 이러한 RFID 기술의 기본 요소와 더불어 인식된 사물의 정보를 광범위하게 구축되어 있는 유${\cdot}$무선 네트워크와 연결하여 활용할 수 있는 모든 기술을 RFID 기술로 정의하였다. 비록 최근에 RFID 기술이 여러 분야에서 큰 이슈로 떠오르고 있지만, 실제 RFID 기술은 오래전인 2차 세계대전에 영국군의 자국 전투기 식별을 위해 이미 활용되고 있었다. 그러나 그 당시에는 RFID 기술의 구성요소인 태그나 리더의 값이 고가였기 때문에 특정분야에 한해 RFID 기술을 적용할 수 있었다. 그 이후에 1990년대에 이르러 RFID 기술은 가축관리, 컨테이너관리, IC 카드 등 점차 다른 분야로 적용이 확대되기 시작했다. 특히 반도체 기술의 발전이 급속도로 이루어진 1990년대 말을 기점으로 RFID 기술에 대한 연구가 활발히 이루어져, 현재에는 SCM(Supply Chain Management), 국방, 의료, 교통, 환경, 동물관리, 홈 네트워크 등 다양한 분야에 적용이 가능한 기술로 평가되고 있다. 특히, SCM에 있어서 RFID 기술 도입은 큰 파급효과가 예상되고 있다. SCM을 구성하는 기업들은 RFID 기술 도입을 통해 제품의 가시성(visibility)과 추적성(traceability)을 확보할 수 있게 된다. 기업들은 자신의 제품이 현재 어디에 있으며 어떠한 경로를 통해 그 자리에 이르렀는지를 실시간(real time)으로 확인 가능하게 된다. 미국의 월마트사(社) 와 영국의 메트로사(社) 같은 선진 유통 기업들은 실증연구를 통해 RFID 기술 도입이 비용 절감과 함께 고객 서비스 향상을 도모할 것이라는 결론을 내린 바 있다. 또한 현제 초기단계이기는 하지만 실제 RFID 기술을 도입하여 운영 중에 있다. 국내에서도 정부주도 하에 RFID 기술에 대한 연구가 활발하게 이루어지고 있으며, 지난 2004년에 유통 물류 분야의 1차 시범사업을 완료하였다. 그러나, 이러한 국내${\cdot}$외의 적극적인 도입 움직임에도 불구하고 국내에서는 아직 RFID기술 도입이 SCM(Supply Chain Management)에 있어서 구체적으로 어떠한 영향을 미치는가에 대한 연구가 거의 이루어지지 못하고 있는 실정이다. 특히 RFID 기술 도입 의사결정자에게 제공될 수 있는 정량적인 ROI 분석 모형에 관한 연구는 시급한 과제로 떠오르고 있다. 따라서 본 연구에서는 SCM 차원에서 RFID 기술 도입에 따른 ROI 분석 모형을 제시하고 적용해 보고자 한다.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.32 no.6
• /
• pp.23-33
• /
• 2004

MDO framework, which provides multidisciplinary system design and optimization environment, requires integration of the analyses codes developed at various computer languages and operating systems, integration of CAD and DBMS, and development of complex GUI. Emphases must be given to the software modification and upgrades in conjunction with the analysis code addition and MDO method implementation. In this study, techniques about system integration and analysis code interface have been studied extensively, and the database design and communication methods which can handle the MDO methods like MDF and CO have been studied. Using the dedicated MDO framework developed for the air vehicle design, the multidisciplinary fighter aircraft wing design has been performed to demonstrate the efficiency and usefulness of the software. Optimum wing configuration is derived using the gradient-based optimization methods within thirty design iterations.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.21 no.5
• /
• pp.630-636
• /
• 2020

This study reviewed camouflage techniques to reduce the visual detect-ability of aircraft. Visual camouflage can be defined as the process of making objects less visible. Aircraft visual camouflage delays detection of the aircraft position, speed, and flight direction. Multi-tone and counter-shaded schemes are generally adopted as camouflage patterns for close-air-support aircraft and air-superiority aircraft, respectively. Another study showed that the monotone scheme is also efficient when the hue and brightness of the camouflage color are controlled correctly. Active camouflage techniques for aircraft have been studied to increase the camouflage effectiveness. In particular, counter-illumination techniques using electroluminescence devices can minimize the difference in brightness between the aircraft and sky background. Active camouflage techniques are expected to enhance the survivability of low-altitude UAVs, which are vulnerable to visual detection.

• Journal of Aerospace System Engineering
• /
• v.15 no.5
• /
• pp.33-42
• /
• 2021

Modern aircraft fighters improve the maneuverability and performance with the RSS (Relaxed Static Stability) concept and therefore these aircrafts are susceptible to abrupt pitch-up in the transonic and moderate Angle-of-Attack (AoA) flight region where the shock wave is formed and the mean aerodynamic center is moved forward during deceleration. Also, the modeling of the aircraft flying in this flight region is very difficult due to complex flow filed and unpredictable dynamic characteristics and the model-based control design technique does not fully cover this problem. In this paper, we analyzed the performance of the TPMC (Transonic Pitching Moment Compensation) control based on the model-based IDI (Incremental Dynamic Inversion) and the Hybrid IDI based on the model and sensor based IDI during the SDT (Slow Down Turn) in transonic region. As the result, the Hybrid IDI had quicker response and the same maximum g suppression performance and provided the predictable flying qualities compared to the TPMC control. The Hybrid IDI improved the performance of the Over-G protection controller in the transonic and moderate AoA region

• Journal of the Korea Institute of Construction Safety
• /
• v.2 no.1
• /
• pp.36-44
• /
• 2019

$21^{st}$ century is digitally civilized era. Technologies such as AI, Iot, Big Data, Mobile and etc makes this era digitally advanced. These advancement of the technology greatly impacted detection range of the radar. Human's eye sight can see about 20Km and hear 20 ~ 20000 Hz. These limitations can be overcome using radar. This radar technology is used in military, aircraft, ship, vehicle and etc. to replace human eye. However, radar technology is capable of making False Alarm Rate. This document will propose the fix of these problems. Radar's distortion includes beam refraction, diffraction and reflection. These inaccurate data result in deterioration of human judgements and my cause various casualties and damages. Radar goes through annual testing to test how many false alarm is being produced. Normal radar usually makes 10 to 20 False alarms. In emergency situation, if operator were to follow this false alarm, this might result in following false object or take 12 more seconds to follow the right object. This problem can be overcome by using different radar data from different places and angles. This helps reduces False Alarm rate and track the object twice as fast.