This paper proposes the armored combat bulldozer, essential for amphibious tasks, requires water ingress prevention and submersion capabilities, typically addressed by a centrifugal pump. This study aims to boost the bulldozer's drainage pump efficiency by replacing the traditional aluminum 3-blade impeller with one made of ASA material using 3D printing. Analysis via ANSYS Fluent revealed that the 5-blade impeller increased discharge volume by 19.31% and efficiency by 6.07%, while the 6-blade variant saw a 27.07% increase in discharge volume and 8.81% efficiency improvement. Further scrutiny with ANSYS Static Structure ensured the new impellers' structural integrity and robustness under extreme conditions. This research confirms the potential of 3D printing in enhancing military equipment, demonstrating significant improvements in pump performance and opening paths for advanced manufacturing techniques to meet the demanding needs of combat vehicles.

해외 위험지역에서 다양한 위난상황으로부터 재외국민을 보호하고 본 국으로 안전한 귀환을 위해 외교·국방·정보 역량을 동원하여 수행되는 활 동이 비전투원후송작전(NEO)이다. 미국과 한국이 수행했던 NEO 사례분 석을 바탕으로 도출된 NEO의 성공적인 수행을 위한 요인과 시사점은 다 음과 같다. 첫째, NEO 계획의 핵심요소는 변화하는 작전환경에 대한 상 황인식과 대비태세이다. 둘째, 후송작전의 기본원칙인 정확성, 보안, 속 도를 기반으로 하여 적대세력의 접근경로와 공격유형을 파악하고, 급변 하는 위협환경에 대응할 수 있는 신속대응군과 후송부대를 투입해야한 다. 셋째, NEO 계획, 경보발령, 집결·재배치, 후송·귀환 과정에서 국무부 /외교부, 국방부, 재외공관, NEO 수행부대 간의 효과적인 협력과 조정 업무가 이루어져야한다. 넷째, 국방부와 정보기관은 현지 임무수행단에 게 작전지역 평가, 위협평가, 적대세력의 위협방책 식별, 대응책 등의 정보를 제공해야한다. 다섯째, 내란과 분쟁지역에서 NEO는 시·공간 제 한사항이 많은 원거리 해외지역에서 작전이기 때문에 동맹국·우방국과의 긴밀한 군사협력 및 연합작전도 필수적이다.

본고는 『헨리 6세』 2부와 3부가 가부장제의 이념을 바탕으로 남녀 간의 뚜렷한 역할 구분에 기초하고 있다고 보고 전통적인 성 역할에 따르지 않는 마가렛과 같은 여성의 양상을 살핀다. 주로 마가렛의 용맹성, 전투력과 성적 매력과 방종이 주변 남성 인물의 가부장적인 가치에 대립되는 모습을 추적한다. 마가렛과 일리노어 등이 권력을 추구하는 과정에서 남성들, 특히 영국 남성을 대표하는 기사도적 영웅들과 대항하는 양상을 보이는데 이 여성 전사들이 대표하는 가치가 어떻게 남성들의 이상적 영웅주의나 부자간의 혈연 중심 관계에 대립하는지도 살핀다. 일부 남성 인물들이 감정에 치중하는 연인의 모습을 보이며 남성간의 유대를 약화시키는 결과에 이르는 아이러니한 상황 또한 살펴본다. 남성들이 이들 여성과 관련하여 남성성을 잃게 되는 과정을 분석함으로써 『헨리 6세』 2부와 3부에 담긴 가부장제의 양상과 여성 전사의 전복적 힘을 충실히 고찰하고자 한다.

This study addresses the optimal design methodology for switching between active electronically scanned array (AESA) radar operating modes to easily select the necessary information to reduce pilots' cognitive load and physical workload in situations where diverse and complex information is continuously provided. This study presents a procedure for defining a hidden Markov chain model (HMM) for modeling operating mode changes based on time series data on the operating modes of the AESA radar used by pilots while performing mission scenarios with inherent uncertainty. Furthermore, based on a transition probability matrix (TPM) of the HMM, this study presents a mathematical programming model for proposing the optimal structural design of AESA radar operating modes considering the manipulation method of a hands on throttle-and-stick (HOTAS). Fighter pilots select and activate the menu key for an AESA radar operation mode by manipulating the HOTAS’s rotary and toggle controllers. Therefore, this study presents an optimization problem to propose the optimal structural design of the menu keys so that the pilot can easily change the menu keys to suit the operational environment. K

In the (3,3) close combat model based on the Lanchester Square Law, this study proposes a plan to optimally allocate residual combat power after the battle to other battlefields. As soon as the two camps of three units can grasp each other's information and predict the battle pattern immediately after the battle began, the Time Zero Allocation of Force (TZAF) scenario was used to initially allocate combat power to readjust the combat model. It reflects travel time, which is a "field friction" in which physical distance exists from battlefields that support combat power to battlefields that are supported. By developing existing studies that try to examine the effect of travel time on the battlefield through the combat model, this study forms a (3,3) combat model, which is a large number of minimum units. In order to achieve the combat purpose, the principle of optimal combat force operation is presented by examining the aspect that support combat power is allocated to the two battlefields and the consequent battle results. Through this, various scenarios were set in consideration of the travel time and the situation of the units, and differentiated results were obtained. Although the most traditional, it can be used as the basic logic of the training or the commander's decision-making system using the actual war game model.

In this study, the abnormal noise phenomenon generated intermittently in the shock absorber of the combat armored vehicle was approached from the side of the squeak joint to solve the phenomenon. In order to identify the cause of the noise, the factors causing friction in the shock absorber were checked from the viewpoint of problem product analysis, process, and design. As an improvement plan, by improving the non-lubricated section in the nitrogen chamber, the operating noise was reduced to a level lower than that of a general automobile engine along with the elimination of noise. Considering that this is a combat vehicle, it is judged that it has been improved so as not to affect the survivability and health of the crew during equipment operation. Through the improvement of this study, it is expected to prevent power loss and improve the emotional quality of our soldier.

Combat-armored vehicles were equipped with an automatic-fire-extinguishing system to ensure the safety of the crew and vehicle from fires on the vehicle. When a fire was occurred, the automatic-fire-extinguishing system automatically detects the fire through sensors and detection lines, sprays a fire extinguisher, and notifies the crew visually and audibly. Recently, there had been cases of automatic-fire-extinguishing systems malfunction on combat-armored vehicles. In this study, in order to resolve the automatic-fire-extinguisher's malfunction phenomenon, ground noise and inter-circuit noise generated from the fire detection line were identified, and the resistance connected on the circuit was revised to remove noise. As a result of resistance revision, the noises was eliminated and the electromotive force difference between input circuits was made constant, thereby improving the malfunction of the automatic-fire-extinguishing system. By applying the result, it was confirmed that the control device sensed a temperature similar to the actual temperature on actual vehicles, and it was confirmed that the automatic-fire-extinguishing system's malfunction phenomenon was not founded in the field vehicles after then.

A universal joint is a device that transmits the power of a combat vehicle engine to a cooling fan. The power of the engine is transmitted to the universal joint as it is without buffering, and play occurs at the joint between the drive shaft connected to the engine and the driven shaft connected to the cooling fan according to the usage time. Accordingly, the universal joint is periodically replaced, and the criterion for this is the degree of torsion of the universal joint. However, if the universal joint is not properly maintained during the replacement cycle, damage to the universal joint as well as damage to the surrounding power supply may occur. Accordingly, a backlash measuring device was developed to determine the limit of durability of the universal joint, and the limit of durability was derived through regression analysis of the backlash value according to the use time obtained from the accelerated life test.

BC 480년 테르모필레 전투는 페르시아의 그리스 침공 당시 벌어진 역 사상 가장 치열한 전투 중 하나로, 영화 ‘300’은 이 전투를 소재로 하고 있다. 스파르타의 레오니다스 왕과 300용사는 3일 동안 1,000배나 더 강 한 페르시아군 진군을 3일 동안 지연시켜 그리스 연합군이 전쟁을 준비 할 시간을 벌어 살라미스 해전을 승리로 이끌게 하였다. 테르모필레 전 투의 유·무형전력을 비교평가해보면 먼저 유형전력은 면에서 ①다수의 페르시아군과 소수 정예의 스파르타군, ②호플리테스의 호플론 방패와 장창의 위력 등이 돋보였고, 무형전력 면에서는 그리스 연합군(특히 스파 르타)의 ①300용사의 강인한 정신력과 숙달된 기량, ②개인·가족·조국의 자유·독립을 위한 투혼, ③지형지물을 활용한 성공적 지연작전 등이 우세 요인으로 작용했다. 테르모필레 전투의 함의 및 교훈으로는 ①노블레스 오블리주의 원형적 전투, ②살라미스 해전준비·기선제압을 위한 전초전, ③군사혁신 및 정보전의 중요성을 일깨워준 전투 등으로 요약해 볼 수 있다. 2,500년이 지난 전투지만 오늘날 우리에게 많은 시사점과 교훈을 주고 있다.

The paint removal of fighter jets is just as important as the painting, because perfect paint removal ensures the quality of the exterior painting on the aircraft. However, the current conditions for paint removal work of the ROKAF’s are poor. It is identified that the painting process currently implemented by the ROKAF is not only exposed to harmful compounds such as harmful dust and hexavalent chromium, but also consumes a lot of water. Thus, the introduction of advanced facility is considered. This study compares the fighter jets painting removal process currently applied by the Korean Air Force with the improved laser coating removal process of the US Air Force, and conducts an incremental analysis to perform economic analysis for the introduction of advanced facility. Four scenarios were envisioned on the premise of an increase in the number of fighters in the future, incremental analysis shows that laser coating removal method is advantageous in all scenarios. In addition, it is recommended that paint removal cycle keeps the current 12-year and the outsourcing amount to civilian depot is reduced.

현시대에도 동아시아 세계에서 국가 간 이익을 위해 합종연횡이 수시로 이루어지고 있다. 역사적으로도 한반도에서 6.25를 제외한 국제전이 3번에 걸쳐 발생한바, 서기 663년의 백촌강 전투, 1592년의 왜와 조선・명나라 의 임진왜란, 1894년의 청일전쟁이 있었다. 위에 열거한 전쟁중 7세기 중 엽 한반도에서 벌어졌던 백촌강1) 전투는 신라와 당의 연합군과 백제부흥 군과 왜의 동맹군이 싸운 전쟁으로서 라당 연합군의 승리와 백제부흥군과 왜군이 참패한 전투이다. 6세기 수나라가 중국을 통일하여 동아시아의 국 제사회는 큰 변화에 직면하게 되었다. 이러한 역사적 변화에 따른 한반도 에서도 삼국 간의 세력균형이 깨지고 적자생존과 영토 및 세력 확대를 위 해 국제적으로 합종연횡이 가속화되었다. 백촌강 전투는 이와 같은 역사적 배경으로 전개된 국제전으로서, 전투의 영향은 동아시아 국제사회를 흔들 고, 역사의 새로운 전환점을 마련했다. 본 연구는 백촌강 전투 전후 당의 동아시아에 대한 대외정책은 어떤 것이 있었으며, 전투 후 대외정책은 어 떻게 변화하였으며, 그에 따라 동아시아 각국은 어떻게 대응하였는지를 알 아보고자 한다.

Combat vehicles were developed in two types depending on the purpose of operation. The body of the vehicle is relatively large welded structure, and there is a quality problem in that welding deformation occurs in a certain area. Welding deformation is a problem that is inevitably generated during the welding process, and additional corrective work is performed. However, due to the structural characteristics of the welded structure of combat vehicl, there are many limitations in the correction method, which lowered the productivity. To improve this problem, we intend to establish improvement measures through analysis of the areas where welding deformation occurs and apply corrective measures suitable for welding structures of combat vehicles. For the design improvement plans, the finite element analysis were used and the correction method were applied to simulated structure to confirm the possibility. Finally, the improvement effect was confirmed by manufacturing the actual welded structure. Based on the results of this study, it is expected that the productivity of related similar welding structures as well as structures of wheeled armored vehicles, can be improved.

The Korean Air-Force aircraft maintenance depot paints the exterior of various aircraft, including high-tech fighters. Aircraft exterior painting is a maintenance process for long-term life management by preventing damage to the aircraft surface due to corrosion. The de-painting process is essential to ensure the quality of aircraft exterior paints. However, because the Korean Air-Force’s de-painting process is currently done with sanding or Plastic Media Blasting (PMB) method, it is exposed to harmful dust and harmful compounds and consumes a lot of manpower. This study compares the de-painting process currently applied by the ROK Air-Force and the more improved process of the US Air Force, and performs economic analysis for the introduction of advanced equipment. It aims to provide information that can determine the optimal time to introduce new facilities through Cost-Volume-Profit (CVP) analysis. As a result of the analysis, it was confirmed that the sanding method had the most economical efficiency up to 2 units per year, the PMB method from 3 to 21 units, and the laser method from 22 units or more. In addition, in a situation where the amount of de-painting work is expected to increase significantly due to the increase in fighters in future, BEP analysis was conducted on the expansion of the existing PMB method and the introduction of a new laser method. As a result of the analysis, it was confirmed that it is more economical to introduce the laser method when the amount of work exceeds the PMB work capacity(18 units per year). The paper would helpful to improve the productivity and quality of the Korean Air Force Aircraft maintenance depot through timely changes of facilities in the workplace in preparation for expansion.

Modern combat has been extended to the concept of real-time response to a variety of threats simultaneously occurring in vast areas. In order to quick command determination and accurate engagement in these threats, the combat system has emerged in frigate. Frigates conduct anti-surface, anti-submarine, and anti-aircraft as the core forces of the fleet. In this study, the combat effectiveness measures naval frigates using AHP (analytic hierarchy process) method. A hierarchical structure for measuring the combat effectiveness was developed, and weights of criteria were calculated by expert surveys and pair-wise comparisons. In addition, the combat effectiveness of frigates was synthesized and compared. The weights for each attribute were calculated, and the weights for the three main attributes were in the order of act (0.594), evaluate (0.277), and see (0.129). As a result of calculating the weight, anti surface warfare (0.203) was the highest. The combat effectiveness of FFG Batch-III, which has advanced hardware and software and improved combat system capabilities, see (1.73 to 2.56 times), evaluate (1.68 to 2.08 times), and act (1.31 to 3.80 times) better than the comparative frigate. In summarizing the combat effects of the frigate, FFG Batch-III was 1.41~2.95 times superior to the comparative frigate. In particular, a group of experts evaluated the act importantly, resulting in better combat effectiveness.

청대 袁永綸이 쓴 필기 『靖海氛記』는 18세기 말부터 19세기 초까지, 중국 남부 해상에 창궐하던 해적을 토벌한 기록이다. 중국의 역사 사료 중 『정해분기』 만큼 해적에 대한 다양한 내용을 담고 있는 문헌은 드물다. 안타깝게도 1830년에 초판이 출간 된 후, 중국에서는 유실되어 전하지 않다가, 2007년 대영도서관에서 판본이 발견되었다. 현재까지 『정해분기』에 대한 전면적인 연구는 상당히 부족한 편이다. 이에 본 논 문은 작가 원영륜과 『정해분기』의 판본, 영역본을 소개하고, 『정해분기』의 내용을 해적단의 형성과 세력 확장, 분열과 투항이라는 흐름에 따라 나누어 살펴본 후, 이를 기초로 그 특징과 의의를 분석하였다.

적외선 유도 무기 체계의 발달로 항공기의 생존성은 지속적으로 위협받고 있으며, 항공기의 생존성을 향상시키기 위한 적외선 스텔스 기술 관련 연구가 진행되고 있다. 본 논문에서는 적외선 유도 미사일이 항공기와 배경 간의 대비 신호를 탐지하는 것에 주목하여 비행 조건에 따른 항공기의 최적 적외선 신호를 분석하고자 하였다. 이를 위해 항공기의 비행 조건을 고려하여 유동 해석과 대류, 전도, 복사 3차원 열전달 해석을 수행하였고, 동체 표면 온도를 도출하여 항공기 주변 유동 특성을 기반으로 항공기의 적외선 신호를 분석하였다. 더 나아가, 비행 조건 별로 최적 적외선 신호를 갖기 위한 최적 방사율을 도출하였고, 비행 조건 별로 최적 방사율을 동체 표면에 적용했을 때 적외선 신호 저감 효과를 분석하였다.

In this study, analyzed the cause of failure of the cardan shaft for water propulsion of an armored wheeled vehicle. During the development test(DT), the vehicle was deflected to the left on the water. As a result of the confirmation, increasing angular displacement and abrasion of SPIDER(Universal joint) occurred. As a result of a structure analysis and torsion fracture test, cause of failure is not insufficient design and strength deficit of each parts. and as a result of a simulation review of the assembly layout of each part, it was confirmed that excessive rotational vibration occurred. In order to solve this problem, improved the assembly layout of the water propulsion system and the worn SPIDER lubrication. Since there has been no occurrence of the same case between military operations so far, it has been confirmed that the improvement plan is appropriate.