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A Study on the Development of Composite Brake Based on Long-Fiber Carbon Materials for Improving Durable Quality
내구 품질 향상을 위한 장섬유 탄소 소재 기반 복합재 브레이크 개발에 관한 연구
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Jaehun Shim, Kang Yoo, Sera Hwang, Yooncheol Kim, Hyungshik Shim, Sungshin Kim, Jaeho Shin
심재훈, 유강, 황세라, 김윤철, 심형식, 김성신, 신재호
- Carbon ceramic composite brakes offer excellent braking performance, good vehicle appearance and a significant weight reduction in unsprung mass. This allows for …
- Carbon ceramic composite brakes offer excellent braking performance, good vehicle appearance and a significant weight reduction in unsprung mass. This allows for improved energy efficiency and maximized driving performance. Therefore, they are expected to be widely adopted in high-performance electric vehicles in the future. However, research on the durability of composite brakes under harsh, repeated braking environment remains insufficient. In this paper, we propose a new composite disc to address this limitation. First, the durability of both existing and new composite discs was assessed. Second, the manufacturing method, structure and mechanical properties of the new composite disc were analyzed. The analysis results confirmed that the mechanical properties of the new composite disc were significantly improved compared to those of the existing composite disc. Third, the new composite disc underwent harsh, repeated braking environment tests to verify durability. Finally, the friction characteristics of the new composite disc were assessed to confirm its effectiveness. - COLLAPSE
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A Study on the Development of Composite Brake Based on Long-Fiber Carbon Materials for Improving Durable Quality
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Analysis of High-Voltage Battery Charge Rate and Voltage Change Characteristics for EV Conversion Tuning Inspection
EV 컨버전 튜닝검사를 위한 고전압배터리의 충전율과 전압변화 특성 분석
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Daekwon Yun, Haetaek Lee, Ilwoo Nam, Jaegon Yun
윤대권, 이해택, 남일우, 윤재곤
- This study analyzed the SOC-voltage characteristics of high-voltage batteries and proposed methods and criteria for evaluating SOC and voltage during EV conversion …
- This study analyzed the SOC-voltage characteristics of high-voltage batteries and proposed methods and criteria for evaluating SOC and voltage during EV conversion tuning inspections. Regression analysis of collected data on SOC and voltage changes during the charging process revealed a very high correlation. In particular, the linearity of the data measured in slow charging mode was found to be stable and constant. Therefore, tuning inspection criteria for SOC and voltage can be established by considering the linear model and tolerances analyzed in slow charging mode, and the normal operation of the signal can be evaluated based on these criteria. - COLLAPSE
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Analysis of High-Voltage Battery Charge Rate and Voltage Change Characteristics for EV Conversion Tuning Inspection
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Development of a HILS-Based Performance Evaluation System for Safety Devices of Cranes
HILS 기반 크레인용 안전장치 성능 평가 시스템 개발
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Hyune-Jun Park, Hong-Seok Lee, Jeong-Gil Kim, Jung-Woo Cho, Seok-Jo Yang, Joo-Young Oh
박현준, 이홍석, 김정길, 조정우, 양석조, 오주영
- Crane tip-over accidents lead to severe casualties, property damage, productivity loss, and significant socioeconomic impacts. The primary causes of such accidents include …
- Crane tip-over accidents lead to severe casualties, property damage, productivity loss, and significant socioeconomic impacts. The primary causes of such accidents include operator error, ground subsidence, and overload lifting operations. To prevent them, a variety of actions are being implemented, including safety training, increased on-site supervision, strengthened safety regulations, and overload prevention devices such as automatic moment limiting devices (AML). The allowable lifting capacity of a crane should be determined by considering multiple operational factors, including crane inclination, boom length, and boom angle. However, conventional AML systems often rely primarily on manufacturer-provided data due to limited availability of real-time operating information, which can result in overly conservative lifting capacity limits. Therefore, accurate estimation of allowable lifting capacity requires experimentally measured operational state information. In this study, a dynamic analysis model was developed to evaluate crane safety devices in a laboratory environment. A Hardware-in-the-Loop Simulation (HILS) platform was established by integrating the dynamic model with an AML device in real time. Using this platform, the safety factor of the overload prevention device was evaluated under various conditions, including boom length, boom angle, lifting load, and crane inclination. The proposed HILS-based evaluation framework provides a practical approach for performance assessment of overload safety devices and can be applied to various types of cranes. - COLLAPSE
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Development of a HILS-Based Performance Evaluation System for Safety Devices of Cranes
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Analysis of Dashcam Metadata Tampering for Ensuring Vehicle Accident Data Reliability
차량 사고 데이터 신뢰성 확보를 위한 대시캠 메타데이터 위변조 가능성 분석
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Seryong Baek, Hyungkyu Kim, Dongmin Choi, Daebong Lee, Minje Cho
백세룡, 김형규, 최동민, 이대봉, 조민제
- Recent Tesla dashcam systems embed driving-related metadata within video files using the SEI (Supplemental Enhancement Information) structure, enabling detailed reconstruction of vehicle …
- Recent Tesla dashcam systems embed driving-related metadata within video files using the SEI (Supplemental Enhancement Information) structure, enabling detailed reconstruction of vehicle behavior. While this feature enhances the usability of dashcam data for accident analysis, it simultaneously introduces a critical vulnerability. Due to the lack of robust security mechanisms, SEI metadata can be easily extracted and manipulated using publicly available tools and generative AI. This enables intentional falsification of key parameters such as vehicle speed and accelerator input. Such tampering has the potential to distort accident reconstruction results and influence legal liability decisions. This study investigates the technical feasibility of metadata manipulation and presents representative tampering scenarios. To address these risks, validation strategies are proposed, including physical consistency analysis, multi-source data correlation, and anomaly detection based on vehicle dynamics. The study emphasizes that dashcam metadata should not be treated as inherently reliable evidence without systematic verification. - COLLAPSE
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Analysis of Dashcam Metadata Tampering for Ensuring Vehicle Accident Data Reliability
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Real-Data-Based Prediction of Railway Segment Travel Time and Its Application to Trackside Worker Safety Alerting: Focusing on a Comparison of LSTM and a History-Based Baseline
LSTM과 이력 기반 베이스라인 비교를 중심으로 한 실데이터 기반 철도 구간 통과시간 예측 및 선로작업자 안전경고 응용연구
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Ji-Hoon Song, Sung-Rule Kim, Byung-Jun Shin, Hyung-Mok Kim, Yong-Tae Jung
송지훈, 김성율, 신병준, 김형목, 정용태
- With the expansion of the national commuting zone, the number of KTX and SRT passengers has steadily increased each year, reaching a …
- With the expansion of the national commuting zone, the number of KTX and SRT passengers has steadily increased each year, reaching a record high of approximately 119 million in 2025. Although railway reservation, payment, and inquiry services have significantly improved, little progress has been made in responding to train delays and enhancing passenger convenience. According to the Korail Customer Service Charter standard (KTX delays exceeding 5 minutes), the number of KTX delay incidents increased from 21,661 cases in 2022 to 25,690 cases in 2023, while the delay rate rose from 17.6% to 20.8%. Frequent delays are problematic in themselves, but the inadequacy of the train delay information system further aggravates passenger inconvenience. Differences in displayed delay times between station electronic boards and mobile applications, along with inaccurate and continuously changing arrival time information, increase confusion among passengers. To address these issues, this study proposes a railway arrival time prediction model that combines high-precision GNSS correction technology with a time-series deep learning model based on Long Short-Term Memory (LSTM). The proposed model eliminates subjective judgments by train operators and provides deterministic, distance-based arrival time information with second-level precision. This enables passengers to seek alternative transportation options or prepare appropriate responses based on expected waiting times. Ultimately, the proposed system is expected to contribute to reducing the chain of passenger complaints caused by train delays. In addition, the predicted segment travel time is applied to trackside worker safety management. By combining a worker’s location with the position of an approaching train, the remaining time until the train passes the worker’s location is estimated, and a mobile application that issues staged train-approach alerts based on this estimate was implemented. - COLLAPSE
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Real-Data-Based Prediction of Railway Segment Travel Time and Its Application to Trackside Worker Safety Alerting: Focusing on a Comparison of LSTM and a History-Based Baseline
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- Electro-Hydraulic Active Suspension for Rollover Prevention: Control Performance and Actuator Design Requirements
- Jeongwoo Lee
- This study proposes an active body control system model that supplies the required hydraulic pressure only during active roll control to reduce …
- This study proposes an active body control system model that supplies the required hydraulic pressure only during active roll control to reduce the high energy consumption associated with conventional active suspension systems. To this end, a commercially available electro-hydraulic actuator was modeled, and a control algorithm was constructed by combining roll-angle estimation and rollover index calculations. Co-simulation results using CarSim and Simulink demonstrated that the vehicle equipped with the proposed active suspension system reduced the rollover index by more than 70% compared with the passive suspension system and maintained the roll angle within 5 degrees under emergency driving conditions, confirming its rollover prevention capability. Furthermore, the actuator requirement analysis showed that the maximum simulated cylinder pressure was 82.5 bar under the 0.5 g condition. This value was rounded upward to define a peak operating-pressure requirement of 85 bar, corresponding to a required operating load of approximately 664.6 kgf when a conservative nominal piston area of 7.9 cm2 was used. A design pressure rating of at least 100 bar was recommended, providing a 17.6% pressure margin above the 85-bar operating requirement. These results provide design guidelines for the motor, actuator, and overall system configuration of future electro-hydraulic active suspension systems. - COLLAPSE
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A Study on Integrated Safety Management for e-Mobility Common-use Swappable Battery Services Based on a Testbed Pilot
테스트베드 실증 기반 e-모빌리티 공용 교환형 배터리 서비스의 통합 안전관리 방안 연구
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Jungsoo Park, Sein Oh, Seungbae Ahn, Youngmin Jang
박정수, 오세인, 안승배, 장영민
- Common-use swappable battery services are attracting attention as a solution to the short driving range and long charging time of light e-mobility …
- Common-use swappable battery services are attracting attention as a solution to the short driving range and long charging time of light e-mobility vehicles. In Korea, the national standards KS R 6100, 6200, 6300 and 6400 have standardized battery packs, charging stations and electric two-wheelers at the hardware level. However, the safety requirements that arise from the integrated and unattended operation of these components in the field remain insufficiently addressed. In this study, an integrated testbed consisting of electric bicycles, electric motorcycles, common-use swappable battery packs, charging stations and a service platform was operated on real roads over 21 sessions, which yielded 56 operation records and 860 runs. Issues were logged in 26 of the 56 records and were grouped into seven types, namely communication loss, protection faults of the battery management system (BMS), pack detachment during riding, mismatch of the displayed state of charge (SOC), non-identification of battery IDs, station shutdown by a humidity warning and lock failure. Each type was quantified by its frequency of occurrence and rated with a risk matrix that combines frequency and severity. Three types were rated high, two medium and two low, and no issue recurred in the seven sessions that followed the remedial actions. Hazards were then classified into five types on the basis of standard safety tests, service cases and the rated pilot issues, and the main causes and preventive measures of each type were identified. Responsibilities of manufacturers, service operators and users over the service life cycle were defined together with a history management scheme based on battery IDs. Inspection intervals, abnormality detection criteria and an accident reporting procedure were specified according to the risk levels. The proposed measures are expected to support the safe and efficient use of the charging infrastructure and to prevent accidents. - COLLAPSE
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A Study on Integrated Safety Management for e-Mobility Common-use Swappable Battery Services Based on a Testbed Pilot
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- Understanding High-Skilled Driving Through Tire Utilization Characteristics: A Driver-in-the-Loop Vehicle Dynamics Perspective
- Ilhan Lee, Jaewon Nah
- Highly skilled drivers can operate vehicles near handling limits even though tire forces, road friction, and many vehicle states are not directly …
- Highly skilled drivers can operate vehicles near handling limits even though tire forces, road friction, and many vehicle states are not directly observable. This study adopts a driver-in-the-loop vehicle dynamics perspective to interpret high-skilled driving through tire utilization characteristics. The objective is not to estimate individual tire forces or reproduce driving trajectories, but to examine how available vehicle dynamic capability is utilized and reflected in observable vehicle-level responses. Vehicle trajectories, speed profiles, longitudinal and lateral acceleration, and g-g diagrams are analyzed. The relationship between the friction circle and the g-g diagram is used as an interpretive basis, while an empirical tire utilization envelope is employed only as a qualitative reference. A pilot study was conducted using driving data from three professional drivers with different performance levels under similar conditions. Representative sequential corner sections were selected to examine differences in trajectory, speed management, acceleration transition, and g-g characteristics. The results indicate that the performance difference was not sufficiently explained by minimum corner speed, maximum lateral acceleration, or peak values in g-g space. The higher-performance driver did not simply use a larger acceleration envelope. The main difference was observed during the transition to re-acceleration, where lateral tire utilization was reduced and positive longitudinal acceleration was recovered more effectively. These observations suggest that tire utilization characteristics can help interpret high-skilled driving as a temporal process of organizing vehicle dynamic capability. The proposed perspective may support studies on driver coaching, human-inspired vehicle control, expert driver modeling, and learning from skilled human operators for intelligent machines, including collaborative and humanoid robots. - COLLAPSE
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A Study on Legal and Institutional Improvement for Strengthening Driver Warning Systems in cases of Unintended Disengagement of Level 2 Automated Driving Systems
운전자가 의도하지 않은 레벨2 자율주행시스템 해제 시 운전자 경고 강화에 대한 법제도 개선방안 연구
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Byoung Joon Moon, Sung Jae Ha
문병준, 하성재
- This study examines the safety risks associated with unintended disengagement of Level 2 automated driving systems (ADS) and proposes legal and institutional …
- This study examines the safety risks associated with unintended disengagement of Level 2 automated driving systems (ADS) and proposes legal and institutional measures to strengthen driver warning requirements. Unlike Level 3 or higher automated driving systems, Level 2 systems, which simultaneously control steering and longitudinal motion, do not include a legally defined transition-demand procedure. When Level 2 systems are unexpectedly disengaged due to sensor or lane-recognition failure, adverse weather, or system malfunction, drivers may fail to recognize the need to resume manual control. Domestic and international regulatory frameworks—including the Korean Motor Vehicle Safety Standards, UN Regulation No. 157 (ALKS), UN Regulation No. 171 (DCAS), the EU General Safety Regulation, and recent U.S. regulatory trends—were comparatively analyzed, together with prior studies on driver take-over performance and real-vehicle tests of warning behavior during Level 2 disengagement. The analysis confirmed that specific warning standards for Level 2 disengagement remain insufficient both domestically and internationally; most tested vehicles provided only an indicator-light cue or visual warning, whereas multimodal warnings more effectively improve driver awareness and take-over time. Based on these findings, this study proposes three measures: domestic adoption of UN Regulation No. 171, mandatory multimodal disengagement warnings with quantitative performance criteria, and mandatory driver education for drivers of Level 2 vehicles. - COLLAPSE
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A Study on Legal and Institutional Improvement for Strengthening Driver Warning Systems in cases of Unintended Disengagement of Level 2 Automated Driving Systems
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Design and Evaluation Methodology of a Head Robotics-Based Integrated Performance Evaluation Platform for Driver Monitoring System (DMS), Vehicle-to-Everything (V2X), and Emergency Call (eCall)
Head Robotics 기반 DMS·V2X·eCall 통합 성능평가 플랫폼의 설계 및 평가 방법 연구
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Seonkeon Kim, Hyesoo Kim
김선건, 김혜수
- With the rapid evolution of Software-Defined Vehicles (SDVs), vehicle safety technologies such as Driver Monitoring Systems (DMS), Vehicle-to-Everything (V2X) communications, and Emergency …
- With the rapid evolution of Software-Defined Vehicles (SDVs), vehicle safety technologies such as Driver Monitoring Systems (DMS), Vehicle-to-Everything (V2X) communications, and Emergency Call (eCall) have become increasingly important. However, conventional evaluation methods assess these functions independently, making it difficult to analyze the interactions among driver behavior, vehicle control, and external communication systems. This paper presents the design and development of a Head Robotics-based integrated performance evaluation platform for DMS, V2X, and eCall. The proposed platform integrates repeatable driver behavior reproduction, multimodal data acquisition, AI-based vehicle event recognition, manufacturer-independent event standardization, and Digital Twin-based replay into a unified evaluation framework. In addition, a chassis dynamometer-based test environment and integrated evaluation scenarios are proposed to support future validation based on international safety assessment programs such as UNECE WP.29, EU GSR2, Euro NCAP and KNCAP. The proposed platform provides a comprehensive framework for evaluating next-generation vehicle safety systems in SDV environments. - COLLAPSE
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Design and Evaluation Methodology of a Head Robotics-Based Integrated Performance Evaluation Platform for Driver Monitoring System (DMS), Vehicle-to-Everything (V2X), and Emergency Call (eCall)
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A Study on the Amendment of Regulations Regarding Event Data Recorder for Autonomous Vehicle
자율주행자동차 사고기록장치 관련 법규 개정 방안에 관한 연구
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Gyuhyun Kim, Younghan Yoon
김규현, 윤영한
- This study examines the installation standard for Event Data Recorders (EDRs) in autonomous vehicles building upon existing standards for passenger cars and …
- This study examines the installation standard for Event Data Recorders (EDRs) in autonomous vehicles building upon existing standards for passenger cars and proposes amendments to safety regulations regarding their installation. Furthermore, it proposes revisions to the detailed enforcement rules for automobile safety standards, including crash test methods to verify the recording, storage, and retrieval of operational data during high-speed crash tests mandated by law for occupant crash protection, as well as testing methods to evaluate the reliability of EDR sensor data elements. - COLLAPSE
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A Study on the Amendment of Regulations Regarding Event Data Recorder for Autonomous Vehicle
Journal Informaiton
Journal of Auto-vehicle Safety Association
Journal of Auto-vehicle Safety Association
Korean Auto-vehicle Safety Association
한국자동차모빌리티안전학회
Rm. 2001, 13, Seoun-ro, Seocho-gu, Seoul, Republic of Korea
Tel: +82-2-581-8015~6 / E-mail: jlee@kasa.kr Copyright© Korean Auto-vehicle Safety Association. Powered by APUB
Tel: +82-2-581-8015~6 / E-mail: jlee@kasa.kr Copyright© Korean Auto-vehicle Safety Association. Powered by APUB