An automatic fire extinguishing system is installed inside the hull of the K2 main battle tank to protect equipment and crew members in the event of a fire and to enable continuous combat operations. This system detects heat sources and visible light to identify fires and discharges an extinguishing agent within milliseconds. However, there have been concerns that direct contact between the extinguishing agent(HALON 1301) and the driver-particularly on the arms or sides-could result in cold burn-like injuries. To mitigate this risk, the nozzle design of the fire extinguisher was modified to minimize crew exposure. Through modeling simulations and live fire suppression tests, it was verified that the redesigned nozzle still provides effective fire suppression. This study contributes to improving crew safety and enhancing the operational reliability of military equipment while reducing the risk of personnel injury and resource loss due to safety incidents.

이 논문은 S대학교 ‘사고와 글쓰기’ 교과에서 AI 자동 피드백 프로그 램 키위(KEEwi)를 활용한 수업 사례를 분석하고 그것이 지닌 효과와 한 계에 관해 탐색할 것을 목적으로 한다. 먼저 2장에서는 AI 자동 피드백 프로그램의 동향과 원리를 살펴보고 3장에서는 키위 프로그램을 활용한 수업 운영과 구체적 사례에 관해 설명하였다. 4장에서는 설문조사 분석 을 통한 학습자들의 프로그램 만족도와 교육 효과 및 한계에 관해 논의 하였다. 그 결과 이 프로그램은 즉각적이고 반복적인 피드백을 통해 학 습자의 학습 능률을 향상시킬 뿐 아니라 수업에 대한 흥미를 유발하여 글쓰기 역량을 강화하는 데 긍정적인 영향을 끼치는 것으로 드러났다. 또한 교수자에게는 글쓰기 교육의 보조 도구이자 협력자로 기능하며 학 습자 중심의 피드백 환경을 조성하는 데 기여하는 것으로 파악된다. 그 러나 키위 엔진은 완전한 대체 도구가 아니며 자체적인 오류와 문제를 가지고 있어 절대적인 평가 지표로 활용하는 것에는 한계가 있음이 확인 되었다. 이러한 연구는 대학 글쓰기 교양수업에서 AI 자동 피드백 프로 그램이 학습자와 교수자에게 끼치는 영향과 그 한계를 파악하는 데 도움 이 되리라 생각한다.

Fishways, particularly installed at the estuary, have a purpose to encourage fluent migration for migratory fishes, as well as amphidromous and even freshwater species. Not choosing the laborious traditional method of using traps, we assessed the efficiency of the two fishways installed at the west and east barrage of the Nakdong River estuarine barrage respectively, by analyzing the videos recorded through automatic monitoring system. We randomly selected 30 videos monthly at each fishways and identified what kind of fishes were using the fishways and categorised their behaviour such as size, time and whether they passed the monitoring system or not. As a result, a total 8 families 14 species were recorded by monitoring system, with the most dominance of Erythroculter erythropterus (Relative Abundance: 59.5%), followed by Micropterus salmoides (R.A: 19.9%) and Mugil cephalus (R.A: 9.9%). The monitoring system can capture passing fishes during night but the number of appearances of fish species at each hour of a day indicated significant diurnal activities (p<0.05). When fishes pass the monitoring system, approximately 70% of them passed through the monitoring device, while 17% of them showed fallback movement. Our finding indicates that species-specific characteristics of each fish are well represented through video monitoring method. In order to maximise advantages of using video monitoring, it is necessary to consider the installation point properly so that the monitoring system does not interfere with the movement of fish. Also, the utilisation of AI technology in the future is also necessary.

In this study, fire extinguisher system to which form fire extinguisher agents were adopted was applied to the combat vehicle crew room to apply fire extinguishing performance and acid gas safety that meet the national defense standards. As a result of evaluation and verification, the following conclusions were drawn. For standard fire sizes in the combat vehicle crew's standard model, we ignited using a mixture of Novec 1230 and Halon 1301 form extinguisher agent and released form extinguisher agent after 30 seconds to determine the fire extinguishing time. The amount of acid gas generated met the criteria in all cases. When the fire size was increased to 0.12m2 and a 2.0mm nozzle was used, all of the extinguishing time, the amount of acid gas generated, and the concentration of Novec 1230 met the criteria. Despite the more difficult conditions to extinguish the fire by making the fire larger, it was possible to confirm the extinguishing performance of the Novec 1230 form extinguisher agent and its safety against acid gas.

The importance of indoor air quality has significantly increased after the COVID-19 pandemic. This study analyzed the energy consumption of a ventilation system based on various operating methods considering indoor and outdoor conditions. From March to May 2024, experiments were conducted on ventilation systems installed in a hospital in Incheon, comparing the experimental and control groups. The results showed that using the bypass mode in the experimental group reduced total energy consumption by 25.34% compared to the control group. Additionally, utilizing the air-cleaner mode further reduced energy use. This study demonstrates that optimal use of bypass and air-cleaner modes can enhance energy efficiency. Further research is needed to verify long-term applicability under diverse conditions.

This study aims to propose new grading standards that can be applied to AI-based automatic sorting machines, reflecting current distribution and consumption trends. The current domestic grading standards for onions in South Korea are based on the “Agricultural and Fishery Products Quality Control Act”. They classify onions based on criteria such as uniformity, shape, color, and the presence of foreign matter. Onion grading standards are divided into four categories based on bulb diameter and weight. However, in the actual domestic market, onions are distributed according to a five-grade classification based on bulb diameter. Therefore, this study classified onions into eight grades, reflecting current distribution and consumption trends in the domestic market. These grades are applicable to AI-based automatic sorting machines. Marketable onions were classified into A1 (extra large) to A5 (extra small) based on the diameter of a single bulb. Onions used for non-marketable purposes (processing) were classified as grade B. Additionally, grade C and grade D were designated for processing and disposal, respectively. By establishing quality grading classifications that align with current distribution and consumption market trends as well as the operational characteristics of AI-based automatic sorting machines, we can expect improvements in work efficiency and reductions in distribution costs. Following this study, it will be necessary to establish comprehensive quality grading standards that include both external criteria (such as bulb weight and size) and internal criteria (such as detection of internal decay and disease occurrence).

To efficiently develop an automatic assembly system that can enhance the quality and assembly productivity of the shaft assembly in EV relays, a DMU model was utilized. After modeling each component of the assembly system using the CAD software CATIA, a DMU model of the assembly cells and the entire assembly system was created using the assembly model. Additionally, the DMU Kinematics Workbench was employed to verify and validate the design of the automatic assembly system for the shaft assembly, a key component of the EV relay, before actual construction. This approach helped reduce time and costs by minimizing trial and error.

포장상태 평가를 위한 노면영상 촬영은 라인스캔 방식이 주를 이루고 있다. 라인스캔 특성 상, 조사환경이나 장비특성이 달라질 경 우 밝기가 상이한 노면영상을 취득할 수 있고 이는 U-net과 같은 픽셀 단위 segmentation 딥러닝 모델의 균열 자동검출 성능에 영향을 미친다. 본 연구에서는 인공지능 검출 모델의 변경 없이 영상의 밝기 최적화와 morphology 연산기법을 노면영상 전·후처리 방법으로 제시하고 그 효과를 분석하였다. 영상 처리를 통해 과다 검출경향을 보인 이상치들이 제거되었으며 정답으로 간주할 수 있는 전문요 원 분석결과인 GT 균열률과의 상관성 또한 향상됨을 확인하였다.