The 30mm wheel type anti-aircraft gun replaces the aging anti-aircraft gun in the front and is a weapon system for local anti-aircraft defense against enemy aircraft and small unmanned vehicles. In the field, damage to the turret hatch/closed hatch pin occurred between the operation of the wheel type anti-aircraft gun. As a result of the sem analysis of the hatch pin fracture surface, it appears that brittleness fracture occurred and fatigue fracture occurred at the final fracture surface while reaching the fatigue strength by repetitive loads. The hatch angle fixing pin and bracket shapes were changed to disperse the stress concentration. As a result of checking the location of the vulnerable area of the hatch pin and the shear stress value through structural analysis, the safety factor improved from 1.46 to 2.95 after improvement. Through this study, it is expected to be used as a reference material for failure analysis and design plan for the existing system in the future.

항공기와 여객선과 같은 대형 여객 운송의 핵심 가치는 안전이며, 안전관리를 위해 국제조약을 기반으로 제정된 규칙에 따라 명시된 인원 이상의 훈련받은 승무원이 탑승해야 하는 공통점을 가지고 있다. 참사로 이어졌던 항공기와 크루즈 여객선 사고사례 분석을 통해 승무원의 역량과 교육 및 매뉴얼 관리가 안전에 지대한 영향을 미치고 있음을 확인하였으며, 사고 이후 관리부서를 일원화하고, 법 조항의 신설 및 강화와 함께 승무원 안전교육의 중요성이 대두되었다. 그러나 사고를 예방하고 비상 상황에 즉각 대응하기 위해서는 안 전교육 과정과 방식의 변화가 필요하며 이를 통해 교육 효과를 높여 승무원이 정확히 대응할 수 있도록 해야 한다. 첫째, 수직 형태의 구 조와 비슷한 공간의 반복, 화재 방지를 위해 닫힌 구조인 여객선의 공간적 특성은 여행객들이 쉽게 탈출하기 어려운 구조다. 따라서 이는 승무원의 공간적 이해의 중요성을 시사하며 탈출 교육에 확대 반영될 필요가 있다. 둘째, 항공기에 비해 승객의 이동 공간이 큰 여객선의 여객선 승무원의 비율을 높여, 안전관리 수행이 가능한 환경을 조성해야 하며 법률로 규제할 필요가 있다. 셋째, VR, 사이버, 메타버스 등 을 활용한 교육방식의 변화를 통해 승무원의 교육 효과를 높이고 실습 중심의 교육이 되어야 한다. 사고 사례분석을 통해 여객선 승무원 교육방식 및 방향 개선에 시사점을 제시했다. 이를 통해 대부분의 안전사고에 원인으로 지목된 인적요인 즉, 승무원의 안전관리 역량의 향상과 함께 대한민국 크루즈사업의 안전성 확보 및 완전한 성장에 기여하려 한다.

자료동화 시스템의 초기 입력자료(First Guess)을 만드는 입력자료 중 라디오존데, 항공기, 레이더 등 3차원 기 상정보는 정확한 기상 예측을 위한 유용한 정보이다. 이러한 관측자료는 대기 중 기상인자에 대한 연직분포를 제공하며, 수 치예보의 성능을 향상시키는 데 크게 기여한다. 특히, 기상항공기에 탑재된 관측장비 중 드롭존데(Dropsonde), 항공기 통합기상관측시스템(Airborne Integrated Meteorological Measurement System, AIMMS), 해상풍 측정 마이크로파복사계 (Stepped Frequency Microwave Radiometer, SFMR) 등은 항공기 이착륙 및 비행경로에 따른 기상정보의 관측·수집을 통해 수치예보모델의 예측성에 큰 영향을 주는 것으로 알려져 있으며 해상 관측 공백 지역의 해소를 위한 관측수행과 자료수집이 가능하다는 장점이 있다. 이에 본 연구에서는 보다 효율적인 항공 관측 업무 수행 및 수치예보 연구를 수 행하기 위하여 기상항공기에 탑재된 기상요소를 관측하는 장비인 드롭존데, AIMMS의 자료동화 적용 및 모델 결과 간 모의 성능 비교 실험을 수행하였다. 수치모의를 위해 사용된 모델은 현업에서 사용하는 중규모 모델인 KIM-Meso (Korea Integrated Model-Mesoscale version)와 동일한 물리과정으로 구성된 WRF (Weather Research and Forecasting Model) 로 도메인 1 , 2의 수평해상도는 각각 3 , 1 km이며 격자 크기는 690×650, 409×562로 설정하였다. 연구 사례일 은 4가지 위험기상임무(Severe Weather-01, 02, 03, 04) 중 관측자료와 수치모델 검증(SW-04)을 위한 임무로 수행된 태 풍 힌남노 영향 종료 후 고기압의 영향을 받는 비교적 안정한 사례 및 태풍 예측진로에 따른 전향지역의 연직기상구조 변동성 분석(SW-02)을 위한 사례로 한반도 전역에 강수와 강한 바람을 일으켜 피해를 주었던 오마이스 사례로 선정하 였다. 초기 입력자료 개선을 위해 적용한 자료동화 기법은 3차원변분법(3 Dimensional VARiational, 3DVAR)으로 미국 국립환경예측센터(National Centers for Environmental Prediction, NCEP)에서 제공하는 FNL (Final analyses) 재분석장 을 모델의 초기/경계조건으로 사용하였고, 예측 시간은 총 144시간(6일)으로 설정하였다. 아울러 사례기간 동안 모델의 예측 성능을 평가하기 위해 대상지역에 위치한 ASOS (Automated Synoptic Observing System)의 기상변수를 사용하였 으며 관측 및 모의 수치를 통계적으로 비교하였다. 전반적으로 대부분의 관측지점에서 자료동화를 적용한 DA (Data Assimilation) 실험 결과가 자료동화를 적용하지 않은 CTL (Control) 실험에 비해 향상된 예측정확도를 보였다. 특히, 기온은 모든 자료동화 적용 실험(DROP, AIMMS, DROP+AIM)에서 향상된 결과를 보였으며 풍속은 A IMMS , D ROP, DROP+AIM 결과에서 향상된 모의 결과를 보였다. 상대습도의 경우 관측값의 다소 건조한 대기상태를 모델이 일부 모 의하지 못한 것으로 나타났으나, 대체로 CTL 실험에 비해 자료동화 적용 실험의 모의 결과가 향상된 것을 확인할 수 있었다.

In situations where materials are rare difficult to obtain, the ability to test small specimens is becoming increasingly important, particularly for aerospace. In the nuclear power generation field, tensile and small punch testing of small specimens is being utilized to evaluate integrity. In this study, we designed and validated small specimens suitable for aircraft engine components. A fixture for small plate specimens was optimized using finite element analysis to ensure uniform stress distribution, and the specimens were manufactured through precision machining. Tensile tests and creep rupture tests were conducted, and the results were analyzed and compared with those from round specimens made from the same alloy. The yield strength and tensile strength of the small plate specimens were within 5 % of the round specimens, but there was less elongation compared to the round specimens. The difference in the decrease in elongation of the round specimens and small plate specimens was analyzed using the Voce equation to identify the cause. The approach used in this study enables the evaluation of the mechanical properties of engine components with limited material options or those in operation, and is expected to be utilized for monitoring the condition of critical components.

In recent years, airport construction projects have been promoted in island regions such as Gadeokdo, Baengnyeongdo, Ulleungdo, and Heuksando. However, a systematic review of the potential impact of aircraft noise transmitted underwater on marine life remains insufficient. This study acoustically analyzes the transmission process of airborne noise generated by aircraft as it passes through the sea surface and enters the underwater environment. The physical mechanisms are examined with a focus on transmission loss, conditions for total internal reflection, and acoustic impedance differences. In particular, the theoretical transmission coefficients of sound pressure and particle velocity at the air–water interface are reviewed and compared to the auditory reception ranges of marine organisms to assess the potential for acoustic impact. The findings of this study can serve as foundational data for establishing coastal and island airport noise management standards and formulating marine ecosystem protection policies.

This study examines the impact of Propeller blade pitch angle mismatch on Noise, thrust, and vibration in light aircraft. Tests were conducted using a simulator with one blade set at increased pitch angles (10°, 12°, 14°) compared to the standard 8°. Results showed that mismatches increased vibration (above 0.26 IPS), Noise levels, and caused operational issues such as fuel leakage and backfire. While thrust initially increased with pitch, it dropped at 14° due to fuel flow instability. These results highlight the need for strict pitch alignment tolerances to ensure optimal performance and safety in aircraft maintenance and operation.

Aircraft Noise is a sound that humans do not want. In this study, based on the Rotax 914 engine used in Korea, the Propeller blade angle was changed by 1 degree for the 3-leaf “K company” Propeller and the 3-leaf “G” wooden Propeller, and the engine RPM was changed to examine the Noise and thrust changes. The purpose of this study is to check whether Noise and thrust loss are the least at the engine's maximum RPM, and to propose an aircraft operation plan in the noisy aerodrome area based on the values. This research further seeks to identify optimal propeller configurations that balance acoustic performance and thrust efficiency. The results are expected to aid in formulating guidelines for quieter flight operations near populated areas.

This study analyzes the feasibility of operating the E190-E2 aircraft at Ulleung Airport, which has a runway length of 1,200 meters. Using aircraft manufacturer data and PACE LAB under EASA standards, takeoff and landing performance were evaluated under various environmental conditions. Results indicate that with round-trip fuel tankering, the aircraft can carry up to 106 passengers at departure and 89 at arrival under wet runway conditions. If refueling is available at Ulleung Airport, the payload capacity can increase by approximately 10 passengers. A flight test conducted at Pohang Airport supported these findings. The study suggests that minor infrastructure improvements, such as refueling facilities and limited runway extension, would make E190-E2 operations at Ulleung Airport technically feasible.

Baengnyeong Airport is under review for construction to improve transportation accessibility in island regions and has passed the preliminary feasibility study. While airport development significantly enhances transportation convenience for residents, it may also cause aircraft noise issues and lead to conflicts within local communities. Previous studies estimated noise impacts based on ATR-42 and Q300 aircraft. However, this study focuses on a more realistic assessment using ATR-72 and E190-E2 aircraft. By utilizing the FAA’s Aviation Environmental Design Tool (AEDT), a projected noise contour map for Baengnyeong Airport was developed. The analysis shows that considering ATR-72 and E190-E2, which generate higher noise levels, provides a more practical evaluation of noise-affected areas. The results indicate that the noise impact is mostly confined within the runway area; however, potential noise complaints may arise from Baengnyeong Island and nearby regions. Based on these findings, this study suggests the need for optimized flight procedures and urban planning measures to mitigate aircraft noise issues.

Ulsan Airport cannot operate precision instrument approach procedures from the south direction (Runway 18) due to obstacles. Even non-precision instrument approach procedures have higher approach angles and minimum descent altitudes (MDA) compared to other airports, which can pose safety risks for pilots following the flight procedures. Recently, since the introduction of SBAS-based satellite navigation flight procedures in Korea, Ulsan Airport is expected to experience improvements, including reduced offsets and lower minimum descent altitudes in its existing flight procedures. During the design process of new flight procedure routes, a comprehensive analysis of noise differences from existing routes and the noise impact on new areas is necessary. Therefore, this study aims to present the changes in aircraft noise resulting from the implementation of new flight procedures using the Aviation Environmental Design Tool (AEDT)

This study attempted to examine how the airline safety reporting system affects the go-around that may occur when flight crew members operate an aircraft. In addition, we sought to determine how the captain's awareness of command responsibility intervenes and influences the relationship between safety reporting and go-around. The results of the study showed that among the official safety reporting subfactors, Response & Feedback had a statistically significant effect on go-around(ΔR2 = .009, p < .05). In the relationship between formal safety reporting and go-around, the moderating effect of command responsibility(β = .595, p < .05) showed statistically significant results. In addition, the interaction effect between Response & Feedback and Command & Responsibility was confirmed through a simple slope test, and as a result, it had a statistically significant effect when Command & Responsibility was low.

This study proposes a mathematical model to optimize the fighter aircraft-weapon combinations for the ROKAF(Republic Of Korea Air Force). With the recent emergence of the population declining issue in Republic of Korea, there is an urgent need for efficient weapon system operations in light of decreasing military personnel. In order to solve these issues, we consider to reduce the workload of pilots and maintenance personnel by operating an optimal number of weapons instead of deploying all possible armaments for each aircraft type. To achieve this, various factors for optimizing the fighter-weapon combinations were identified and quantified. A model was then constructed using goal programming, with the objective functions based on the compatibility, CEP(Circular Error Probable), and fire range of the weapons, along with the planned wartime mission-specific weapon ratios for each aircraft type. The experimental result's analysis of the proposed model indicate a significant increase in mission performance efficiency compared to the existing system in both operational and maintenance aspects. We hope that our model will be reflected to help improve the operational capabilities of Republic of Korea Air Force.

Airpower plays a key role in neutralizing military threats and securing victory in wars. This study analyzes newly introduced fighter forces by considering factors like performance, power index, operational environment, airbase capacity, survivability, and sustainment capability to devise an optimal deployment strategy that enhances operational efficiency and effectiveness. Using optimization methods like mixed integer programming (MIP), the study incorporates constraints such as survivability and mission criticality. The focus is on major Air Force operations, including air interdiction, defensive counter-air, close air support, and maritime operations. Experimental results show the proposed model outperforms current deployment plans in both wartime and peacetime in terms of operations and sustainment.

This study proposes a mathematical model to optimize the fighter aircraft-weapon combinations for the Republic of Korea Air Force. With the recent emergence of the population cliff issue due to declining birth rates in Korea, there is an urgent need for efficient weapon system operations in light of decreasing military personnel. This study aims to enhance operational environments and mission efficiency within the military. The objective is to reduce the workload of pilots and maintenance personnel by operating an optimal number of weapons instead of deploying all possible armaments for each aircraft type. To achieve this, various factors for optimizing the fighter-weapon combinations were identified and quantified. A model was then constructed using goal programming, with the objective functions based on the compatibility, Circular Error Probable (CEP), and fire range of the weapons, along with the planned wartime mission-specific weapon ratios for each aircraft type. Experimental analysis of the proposed model indicated a significant increase in mission performance efficiency compared to the existing system in both operational and maintenance aspects. It is hoped that this model will be applied in military settings.

Noise is defined as ‘unwanted sound’ or ‘undesired sound’. Recently, the aviation industry has been rapidly developing through convergence with cutting-edge technologies such as UAM. Accordingly, it is expected that new aviation industry models will continue to be created in Korea. In addition, it is expected that aircraft noise will be raised as a new social problem. The characteristic of aircraft noise is that it has a wide transmission range. Therefore, the area affected by aircraft noise is extensive, and the damage area varies depending on the flight path and flight environment. Additionally, it tends to occur continuously in certain areas. This study is an extension of the previous studies 􋺷Study on noise measurement and analysis of C172 aircraft at Muan Airport􋺸 and 􋺷Study on noise measurement and analysis of SR20􋺸, and investigated the noise characteristics of various piston engine trainer aircraft operated in Korea. We want to measure and analyze noise.

Airpower is a crucial force for suppressing military threats and achieving victory in wars. This study evaluates newly introduced fighter forces, considering factors such as fighter performance and power index, operational environment, capacity of each airbase, survivability, and force sustainment capability to determine the optimal deployment plan that maximizes operational effectiveness and efficiency. Research methods include optimization techniques such as MIP(mixed integer programming), allocation problems, and experimental design. This optimal allocation mathematical model is constructed based on various constraints such as survivability, mission criticality, and aircraft's performance data. The scope of the study focuses the fighter force and their operational radius is limited to major Air Force and joint operations, such as air interdiction, defensive counter-air operations, close air support, maritime operations and so on. This study aims to maximize the operational efficiency and effectiveness of fighter aircraft operations. The results of proposed model through experiments showed that it was for superior to the existing deployment plan in terms of operation and sustainment aspects when considering both wartime and peacetime.

The main problem of airport noise is the impact of aircraft noise on the residents around the airport. In order to investigate the noise situation of a certain airport in South Korea, this article selects Muan Airport as the research project, selects five measurement points near the airport, takes aircraft takeoff as an example, measures the maximum noise level of each measurement point during each take off, and uses the American Airport Noise Prediction Software (AEDT 3C) to predict the noise of a single aircraft during take off, Calculate the contour area and sound exposure level data for four aircraft models. The results indicate that the average maximum noise level error between the measurement results and the simulation results is within 2dB, and the maximum noise level ranges from 65.1 to 88.1 decibels with the measurement range.