This study analyzed the security architecture of a blockchain-based authentication protocol and identified major vulnerabilities in smart health and Internet of Things (IoT) environments. The analysis confirmed potential risks including replay attacks due to key synchronization delays, incomplete verification logic in smart contracts, trust imbalance among nodes, and privacy breaches from private key reuse. To address these, the study proposes an enhanced protocol that integrates a time- and nonce-based multi-layered key derivation structure with dynamic trust indicators. Performance evaluation confirmed that the proposed solution simultaneously improves both throughput and security.

This study investigated the root causes of wheel hub assembly looseness and abnormal brake pad wear observed during a 32,000 km durability driving test of a military medium truck. Structural analysis and component-level durability tests were conducted to identify the failure mechanisms and evaluate improvement measures. Test conditions were established based on relevant regulations and previous studies, and braking force and braking torque equations were derived through mathematical modeling. The results showed that the spacer used to fix the brake disc in the original design did not satisfy the required safety factor greater than 1.0. Furthemore, a wheel hub assembly torque durability test under more severe conditions than the original test was performed, and the results demonstrated a significant improvement in durability perfomance.

Korea’s fisheries industry has long played a crucial role in national food security and economic development. However, fisheries resource depletion, marine environmental degradation, and climate change have heightened the need for effective fisheries resource management. This study examines overlapping and conflicting regulations within Korea’s fisheries resource management system and proposes science-based solutions to improve regulatory effectiveness. Through a comprehensive review of fisheries-related laws and policies, combined with case studies on minimum catch sizes, closed seasons, and total allowable catch (TAC), this study identifies multiple instances of regulatory overlap. These include inconsistencies in minimum catch size regulations across different laws and conflicts between TAC and other regulatory measures. Such overlaps reduce administrative efficiency, increase compliance costs for fishers, and weaken the effectiveness of fisheries resource management. To address these challenges, this study aims to analyze the current status of overlapping regulations in Korea’s fisheries resource management system and present scientific and rational solutions. Ultimately, the research seeks to enhance administrative efficiency, alleviate burdens on fishers and contribute to the establishment of a sustainable fisheries resource management framework.

본 연구는 농업부산물과 가축분퇴비를 혼합 후 부숙하여 제조한 퇴비를 밭 토양에 적용하였을 때 가을배추의 생육, 수량, 질소 이용 특성 및 토양 화학성에 미치는 영향을 평가하고 무기질비료와 병용효과를 비교하였다. 재배시험은 답전윤환 밭에서 완전 임의배치 3반복으로 수행하였으며, 처리구는 무처리(NF), 무기질비료(NPK, N-P2O5-K2O=33.9-28.1-18.4 kg 10a-1), 무기질비료 + 농업부산물(NPK+AR), 무기질비료 + 가축분퇴비 (NPK+MC), 무기질비료 50% + 농업부산물 혼합 가축분퇴비(0.5NPK+ARC), 무기질비료 + 농업부산물 혼합 가축분퇴비(NPK+ARC)로 구성하였 다. 무기질비료는 토양검정 결과에 따라 권장사용량으로 시비하였으며, 퇴비는 정식 전 토양에 혼합처리하였다. 연구결과, 무기질비료 사용량을 50%로 줄인 0.5NPK+ARC에서 12,211 kg 10a-1로 가장 높았으며, 무기질비료 처리구 대비 8% 증가하였다. 토양화학성 또한 pH 6.7로 시험전 (pH5.6)보다 증가하였으며, 유기물 함량 25.3%, 유효인산 337 mg kg-1으로 처리구 중 가장 높았다. 뿐만 아니라 농업부산물의 점진적 무기화와 토양 환경개선 효과로 질소 흡수량과 질소 이용 효율도 농업부산물 혼합 가축분퇴비 처리구에서 높게 나타났다. 따라서 농업부산물 혼합 가축분퇴비는 토양 비옥도 개선과 작물 생산성 향상 및 무기질비료 사용량 절감을 동시에 달성할 수 있는 친환경적 토양관리 방안으로 판단된다.

본 연구는 교육부에서 주관하고(법무부와 연계) 한국연구재단이 운영하는 교육국제화역량 인증제(IEQAS) 4주기 평가지표를 대상으로, 지표 체계가 고등교육기관의 외국인 유학생 유치·관리 역량을 타당하게 검증하는지 진단하고 개선 방향을 제시한다. 분석틀은 국제화(Knight), 품질 개념(Harvey & Green), 정책평가·형평성(Dunn), 구조–과정–성과(Donabedian)의 논 의를 토대로 품질보증(QA), 형평성(수평/수직), 성과사슬(구조–과정–성과), 행정부담·표준화의 네 관점으로 구성하였다. 연구 방법은 질적 문서분석 으로, 2011년 시범도입 이후 주기별 편람과 2025년 4주기 IEQAS 편람, 정책문서·선행연구, 2023년부터 2025년까지 언론 보도를 검토하였다. 분 석 결과, 4주기 IEQAS 평가는 산식 합리화와 고등직업교육 트랙 신설 등 개선이 있었으나 지역·유형 격차 반영의 한계, 성과 지표 편중, 지표 별 기준 시점·집계기간 불일치, 어학연수 교원·고용구조 평가 공백이 확 인되었다. 이에 수도권/비수도권 분리 평가, 단계형 사후관리, 온라인·혼 합수업의 과정 품질지표 보강, 기준시점·집계기간·산식 표준화, 어학연수 교원·고용지표 도입을 제안한다. 이를 통해 IEQAS가 국제화·유학생 정책 의 핵심 품질보증 인프라로 기능하도록 개선 방향을 제시하고자 한다.

Since the National Emergency Management Agency’s seismic fragility function, developed in 2009, classified domestic buildings by structural type, numerous studies have used this classification. In 2021, the updated seismic fragility function adopted a slightly more complex classification logic, limited to concrete structures. Data for structural-type classification were derived from information in the building register, including primary use, floor area, permit date, and number of stories. To verify and improve the accuracy of the classification logic, a sample of approximately 1,800 from about 13,000 concrete buildings in a specific region was selected. Structural types classified by the logic were compared with those identified through road views provided by the Architecture HUB. The results confirmed that the existing classification logic requires revision to incorporate additional variables, including the sub-use of the building and the area-by-use on the first floor. The revised logic significantly improved classification accuracy by including those variables.

Grease consistency is a critical quality factor in industrial lubrication processes, as it significantly affects mechanical performance, operational stability, and product durability. In grease manufacturing, fluctuations in process variables such as feed temperature, evaporation time, flow rate, and environmental conditions can cause inconsistencies in quality, which may lead to operational defects or increased maintenance costs. To address this challenge, this study proposes a predictive modeling approach for forecasting grease consistency with the aim of enhancing process quality. Real manufacturing process data were collected from a grease production facility, and irrelevant or highly correlated variables were eliminated through multicollinearity analysis and dimensionality reduction. Multiple machine learning regression techniques were applied and evaluated to identify the most effective model for predicting grease consistency. Through systematic comparison, the final predictive model was developed to provide accurate consistency estimation based on selected process variables. The proposed model enables proactive quality control by allowing consistency deviations to be detected early, thereby supporting process optimization and decision-making in manufacturing environments. This research demonstrates the applicability of data-driven predictive modeling in the grease industry and contributes to the development of intelligent quality management strategies in modern manufacturing. The findings suggest that machine learning-based consistency prediction can play a key role in improving production efficiency and ensuring stable product performance.

This study examines security management issues of small aviation facilities with F-class landing strips in Korea. Under the Airport Facility Act Enforcement Regulation, F-class runways (1,080-1,280 m) mainly serve light aircraft and flight training operations, but many are used continuously outside the national aviation security framework. A comparative review of ICAO, FAA, and EASA regulations shows that foreign systems apply responsibility-based self-regulation, assigning minimum security obligations to operators. However, Korea lacks such mechanisms for small but regularly operated facilities. To address this gap, this study proposes establishing a new Small Aerodrome category and incorporating a Security Management Plan into the National Aviation Security Programme (NASP). These measures will enhance proportional, operator-centered security oversight and strengthen integration within the national aviation security system.

본 연구는 『표준 한국어』 교재에 다문화 교육 요소가 어떻게 반영되어 있는지를 분석하는 데 목적을 두었다. 분석 대상은 초등 및 중·고등용 본 문 교재, 익힘책, 교사용 지도서 등 총 12권이며, 각 단원의 주제, 학습 활동 구성, 문화·삽화·사진 등의 제시 자료를 중심으로 다문화 관련 요소 의 제시 양상을 검토하였다. 분석 기준은 조영달(2010)의 세 범주(정체 성, 문화 다양성, 사회 정의)를 1차 틀로 설정하였으며, 이를 통해 단원 별 문화 내용의 범주화와 제시 방식의 특성을 도출하였다. 분석 결과, 문 화 다양성 요소는 비교적 자주 나타난 반면, 정체성 형성이나 사회 정의 와 관련된 요소는 제한적으로 제시되었고, 외국 문화 소개는 정보 전달 수준에 머무르는 경향이 확인되었다. 이러한 결과를 바탕으로, 향후 교재 개발에서 다문화 교육의 핵심 목표를 보다 체계적으로 반영하고, 학습자 의 문화 감수성과 비판적 사고를 촉진할 수 있는 학습활동 구성이 필요 함을 제안한다.

This study quantitatively evaluated the real-world performance of an IoTbased, context-aware mobile air purification system. Additionally, this system is proposed as a practical alternative to conventional stationary purifiers, overcoming their spatial limitations. To analyze concentration variations, removal efficiency, and air cleaning ratio (ACR) for PM2.5, PM10, and HCHO, three scenarios were tested: S1 (natural ventilation), S2 (stationary purifier), and S3 (IoT-based mobile air purification system). The mobile system (S3) achieved a 1.6-fold higher removal efficiency for PM2.5 compared with the stationary purifier (S2) and reduced the ACR to below 0.4 within 30 minutes after high-concentration events. In contrast, stationary purifiers required approximately 333 minutes to reach background levels (17.11 μg/m3), revealing about a 10-fold difference in cleaning speed. Monte Carlo simulations confirmed the consistent superiority of S3 for both particulate and gaseous pollutants, with HCHO concentrations 36.7% lower (90th percentile) than under S2. According to the health risk assessment, the asthma hospitalization rate decreased by over 40%, the HQ for PM2.5 decreased from 1.1 (S1) to 0.64 (S3), and the ECR for HCHO was 0.62 times that of S2. These findings highlight that spatial responsiveness and mobility, along with filter capacity, are key determinants of air purification performance. In conclusion, the mobile air purifier effectively overcomes the structural constraints of stationary devices and establishes a new paradigm for realtime, adaptive indoor air quality management that helps safeguard occupant health.

This study aims to quantitatively and qualitatively evaluate the operational effects of an emergency-vehicle preemption (EVP) system implemented in Anyang City and to derive improvement directions based on both empirical performance outcomes and user-experienced insights. Specifically, this study integrates three complementary methodologies: (1) controlled field tests comparing pre- and post-EVP travel performance under consistent traffic and signal conditions, (2) a one-year operational evaluation using 204 actual dispatch cases collected from six 119 Safety Centers, and (3) a structured survey of frontline firefighters who directly utilized the EVP system during actual emergency responses. The field test results indicated that the average travel time reduced by approximately 44% while the average travel speed increased by approximately 79%, with paired t-test verification confirming that the observed improvements were statistically significant and attributable to the EVP system instead of to random variations. Similarly, the operational evaluation indicated that the actual travel time reduced by an average of 49% compared with navigation-estimated values, whereas the golden-time (5 min) arrival rates for both fire/rescue and medical dispatches exceeded the regional average, with consistent performance demonstrated even under varying travel distances and road complexities. The firefighter survey further reinforced these findings, with respondents reporting clear improvements in golden-time achievement, reduced anxiety toward potential safety risks, and enhanced perceived safety during emergency trials, as well as identified several practical limitations such as route mismatches, occasional system malfunctions, and difficulty in perceiving preemption activation—factors that suggest necessary technical and operational refinements. In general, the EVP system was evaluated as an effective and highly practical tool that improves emergency-vehicle mobility, arrival-time stability, and operational reliability across diverse dispatch conditions. The combined quantitative and qualitative verification in this study underscores its value as a field-proven technology. Future studies should expand to multiregional longitudinal datasets, controlled analyses considering external variables such as traffic volume and weather, and quantitative evaluation of safety-related impacts such as reductions in intersection collisions or on-route risk exposure to assess the system’s broader policy and operational benefits more comprehensively.

As renewable energy penetration continues to increase, the output variability and forecasting uncertainty of photovoltaic generation have emerged as major operational risks in power systems. This study establishes a sensor-based data quality control procedure to ensure the reliability of meteorological data collected at a PV plant. For temperature, humidity, and wind speed, a four stage QC process physical range check, persistence check, step change check, and median filtering was applied. Solar radiation, which exhibits strong temporal and distributional characteristics, was processed using a three-stage QC procedure consisting of physical range, step change, and frequency distribution checks. Using the quality-controlled meteorological data, PV generation forecasting was performed with SVM and XGBoost models. As a result, the MAPE values improved to 6.32% for SVM and 6.08% for XGBoost after QC application. The findings confirm that meteorological data quality control significantly enhances PV forecasting accuracy and can support future strategies for distributed energy resource management, curtailment mitigation, and power system risk reduction.

소음성난청은 장기간의 소음 노출에 의해 누적적으로 진행되며, 일단 발병하면 회복이 어렵다는 특성이 있으므로 예방적 관리가 무엇보다 중요하다. 이러한 근로자 건강장해 예방을 위해 청력보존프로그램(Hearing Conservation Program)은 사업주가 수립하고 운영 해야 할 종합적인 관리 계획이며, 정부의 산업안전보건 정책에서도 청력보존프로그램의 수립 대상을 청력손실 가능성이 있는 모든 작업으로 확대하는 등 그 중요성이 지속적으로 강조되고 있다. 본 연구는 소음성난청 예방을 위한 청력보존프로그램의 실효성 확보를 위한 개선 방안을 제시하는 것을 목적으로 수행하였다. 이를 위해 학술 논문, 산재승인 현황, 작업환경측정 결과 등 사례 중심의 조사와 청력보존프로그램의 운영실태는 FGI 면담을 통해 분석하였다. 그 결과, 소음수준이 높은 사업장일수록 특수건강진단 결과에서 C1, D1 판정자의 분포가 높게 나타나 소음성난청 발생 위험이 있으며 현재 시행중인 청력 보존프로그램은 보호구 착용, 정기 건강진단에 치우쳐 있어 소음관리와 청력보존프로그 램의 실효성 확보는 시급한 과제임이 확인되었다. 이를 위해, 경영진의 정책적 지원, 근로 자의 참여, 관리감독자의 지속적인 관심을 포함한 종합적 운영이 필수적으로 프로그램의 각 단일요소의 실행이 아닌 “유해인자 확인(식별)→노출(위험)의 평가→조치(공학･관리 대책)→검토 후 피드백으로 구성된 PDCA 기반 통합순환 체계를 상호보완적으로 적용할 필요가 있다. 본 연구에서 제시한 실효성 확보방안은 근로자 청력 보호를 위한 정책적･실 천적 기초자료로 활용될 수 있을 것이며, 또한 기업의 ESG 경영요소 중 하나인 기업활동 의 리스크 관리와 책임경영에 도음이 될 것으로 기대된다. 향후 연구에서는 실제 산업현장 에 적용하여 효과를 비교･검증하고, 소음 수준별 맞춤형 대책을 구체적으로 제시하는 등 개선효과를 실증적으로 검증할 필요가 있다.

In Korea, safety management of hazardous substances is secured by enacting relevant laws, and the main methods can be divided into legal facility inspection and maintenance through appointment of safety managers. In this study, we investigated the current status of safety education at domestic and oversea for hazardous materials, one of the hazardous substances, and were able to identify differences and problems among safety education methods. First, in terms of hardware, it was necessary to review the curriculum content, curriculum time, consistency of curriculum level, and direction of legally recognized education, and In terms of software, it was necessary to secure objectivity in qualification and evaluation methods and to require an education model that reflects the latest trends and can predict risks was required.

In 2015, the safety refresher training system for seafarers was reformed with the aim of strengthening practical skills. However, a failure to forecast demand led to a chronic backlog of trainees. Furthermore, the uniform application of merchant vessel standards (STCW) to fishing vessels (STCW-F) created a qualitative problem, undermining the effectiveness of the education. This study aims to diagnose these issues and propose effective improvement measures. This research employed a mixed-methods approach. First, a comparative analysis was conducted between international conventions (STCW and STCW-F) and domestic regulations, institutional standards, and curricula. Second, an empirical analysis was performed through a survey of 220 merchant and fishing vessel seafarers, which was supplemented by in-depth interviews. The analysis revealed several critical gaps. The domestic legal framework does not distinguish between STCW and STCW-F and the curriculum is heavily biased toward theory, failing to meet international practice-oriented competency standards. The survey and interview results confirmed that the current fits all training is severely misaligned with the operational realities of fishing vessels, which have different equipment and environments. Based on these findings, this study proposes three prolonged improvement plans. First, the curriculum should be dualized to reflect the distinct characteristics of merchant and fishing vessels. Second, a hybrid training model that combines mandatory shore-based training for high-risk drills with flexible onboard training for basic skills should be introduced. Third, facility standards for training institutions should be converted from rigid mandates to flexible guidelines. These measures are expected to resolve the chronic training backlog and enhance the practical emergency response capabilities of all seafarers.

Raw milk contains various microorganisms, necessitating effective sterilization for food safety. As traditional methods of using impellers and magnetic bars in round-bottom flasks remain inefficient and time-consuming, we developed and validated a lowtemperature pasteurization technique using a Taylor vortex mixer. In this study, we analyzed raw milk pasteurization efficacy and rancidity and compared the results with those obtained using different types of mixing systems, such as Taylor vortex and conventional mixers. During the experiments, the sterilization temperature and time were varied to measure milk sample acidity via acid-base titration for the quantitative assessment of rancidity and sterilization effects. We assessed microbial survival through specific culture media. The Taylor vortex system demonstrated superior sterilization efficiency with minimal rancidity, which was attributed to its high thermal and mass transfer efficiencies. In summary, we established the Taylor vortex mixer as an effective and quality-preserving alternative for raw milk pasteurization, highlighting its potential use in the food industry.

과학기술의 발전과 함께 국제해사기구(IMO)는 자율운항선박의 기술 기준 개발을 진행하고 있다. 이 논의의 핵심 주체는 육상에서 선박 운항에 직접 개입 하는 원격운항자와 원격운항센터이다. 원격운항자의 등장은 선박의 기국과 원 격운항자의 소재지인 영토국이 일치하지 않는 법적 현실을 유발하며, 결국 유 엔해양법협약에 따른 전통적인 기국 중심의 관할권 체제의 실효성과 한계에 대 한 근본적인 법적 의문을 제기하고 있다. 본 논문은 이러한 MASS 코드 초안의 논의 동향을 배경으로 원격운항자와 관련된 주요 국제법적 쟁점을 분석하고, 현행 국제협약의 흠결을 진단하여 국제법적 발전을 위한 구체적인 방안을 제시 하는 것이 목적이다. 연구 결과, 첫째, 원격운항자는 기존 선원의 직무를 기능적으로 대체하는 중요도를 고려할 때, 유엔해양법협약의 유연한 해석을 통해 광의의 선원으로 인정되는 것이 타당하다. 그러나 MASS 코드 초안은 원격운항자의 인원배치 에 대해 선박소유자에게 과도한 재량권을 부여하여 기국이 정하는 최소 안전 인원배치 원칙과 충돌하는 문제가 발생한다. 또한, 원격운항자에 대한 교육훈 련 및 자격증명 제도가 STCW협약과 연계된 국제적인 표준화 단계에 도달하 지 못하고 있어 인적 규제가 미흡하다. 둘째, 선내 안전 및 인사노무의 책임 자로서 선장의 지위를 규정하는 해사노동협약을 고려했을 때, 선장이 승선하 는 MASS에 대해서는 선장의 승선 의무를 유지해야 한다. 셋째, 원격운항센터 가 기국 영역 밖에 위치할 경우, 유엔해양법협약 제94조에 따른 기국의 실효 적인 관할권 행사에 중대한 한계가 발생한다. 그 결과, MASS와 관련된 해양 사고조사와 해양범죄 수사 시 관련 국가 간 관할권 경합이나 공백으로 이어 질 가능성도 존재한다. 결론적으로, MASS 운항 시대의 해양 안전 및 안보 유지를 위해서는 원격운 항자의 선원 지위를 명확히 확립하고, 이들의 교육훈련 및 자격증명 제도를 STCW협약과 연계하여 향후 발전시켜 할 필요성이 있다. 나아가 기국의 역외 관할권 행사의 실효성을 확보하기 위해 국가 간 양자 또는 다자 협정 체결을 통한 국제공조 및 역외관할권 집행 체제 구축도 요구된다.

해양레저활동은 수상형, 수중형, 일반형(체험활동)으로 구분되는데 우리나라 는 일반시민이 접근하기 용이한 수상레저활0동을 중심으로 활성화되기 시작하 여 수상레저안전법 및 연안사고예방법이 먼저 제정되었고, 활동의 안전관리 및 사고 발생시 신속한 대응을 위해 해양경찰청이 담당하고 있다. 반면, 뒤늦게 제정된 수중레저법은 세월호 사건으로 해양경찰청이 해체됨에 따라 해양수산부가 담당하게 된 결과, 해양공간에서 이뤄지는 레저활동임에도 불구하고 각기 다른 법과 소관부처에서 담당함으로써 수범자들의 혼란과 안전관리 체계의 효 율성이 저하되고 있다. 이에 수상레저안전법의 안전관리 소관부처를 해양경찰 청으로 이관하는 법안이 발의되고 통과됨에 따라 수상레저활동의 안전관리 체 계의 종합적인 검토가 필요하게 되었다. 본 연구는 수중레저법의 안전관리 강화를 위해 세 가지 개선방안을 제시하 였다. 첫째, 연안사고예방법의 적용범위를 명확히 하여 수중레저활동에 적용되 는 법령 적용의 혼선을 해소하는 한편, 수중레저법의 안전기준을 연안체험활동 의 기준으로 상향조정함으로써 적용 법령에 관계없이 동일한 수준의 안전관리 기준이 제도적으로 확보할 것을 제안하였다. 둘째, 활동 전 위험성 평가 및 활 동지 기록·보관 의무를 규정하고 셋째, 운송업자와 교육업자에게 각각 필요한 안전장비 구비 의무를 부여하는 것이 필요하다고 제언하였다.