• 드라이브 ㆍ 컨트롤
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• 제12권2호
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• pp.27-33
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• 2015

Excavators are versatile earthmoving equipment that are used in civil engineering, hydraulic engineering, grading and landscaping, pipeline construction and mining. Effective operator training is essential to ensure safe and efficient operating of the machine. The virtual reality excavator based on simulation using conventional large size monitors is limited by the inability to provide a realistic real world training experience. We proposed a flexible observation method with a head tracking system to improve user feeling and sensation when operating a virtual reality excavator. First, an excavation simulator is designed by combining an excavator SimMechanics model and the virtual world. Second, a head mounted display (HMD) device is presented to replace the cumbersome large screens. Moreover, an Inertial Measurement Unit (IMU) sensor is mounted to the HMD for tracking the movement of the operator's head. These signals consequently change the virtual viewpoint of the virtual reality excavator. Simulation results were used to analyze the performance of the proposed system.

• Nuclear Engineering and Technology
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• 제56권6호
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• pp.2428-2435
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• 2024

Training for radiation protection and control requires a visual understanding of radiation, which cannot be perceived by the human senses. Trainees must also master the effective use of measuring instruments. Traditionally, such training has exposed trainees to radiation sources. Here, we present a novel e-training strategy that enables safe, exposure-free handling of a radiation measuring tool called a survey meter. Our mixed reality radiation-training system merges the physical world with a digital one. Collaborating with a mixed reality headset (HoloLens 2), this system constructs a mock-up of a survey meter in real-world space. The HoloLens 2 employs a browser-based application to visualize radiation and to simulate/share the use of the survey meter, including its physical movements. To provide a dynamic learning experience, the system adjusts the survey-meter mock-up readings according to the operator's movements, distance from the radiation source, the response time of survey meter, and shielding levels. Through this approach, we expect that trainees will acquire practical skills in interpreting survey-meter readings and gain a visual understanding of radiation in real-world situations.

• 공학교육연구
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• 제5권1호
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• pp.50-58
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• 2002

원격교육(e-learning)의 중요한 점은 교육 컨텐츠에 대한 학습자, 교수자, 관리자 사이에 상호작용을 향상시켜 공감 교육을 얻는 것이다. 교수자가 모든 학습자의 요구를 충족시킬 수가 없기 때문에 지원자 및 운영자인 관리자의 적극적인 도움이 필요하다. 그러므로 운영자의 역할은 원격교육의 성공에 매우 중요하다. 본 논문에서는, 웹 기반 통합 원격교육 환경의 정립과 WWW의 특성을 효율적으로 반영하는 구성주의적 이론을 연구한다. 이러한 환경은 학습자, 교수자, 관리자의 3 모듈로 구성되고 상호작용을 강화하고 교육의 효과를 향상시키기 위해 통합적인 교수 기능이 요구된다. 여기에서 운영자의 역할을 효과적으로 지원하기 위해 관리자 모듈에 중점을 둔 원격교육 시스템 설계 및 구현을 제안한다. 따라서 본 연구

• 해양환경안전학회지
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• 제16권2호
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• pp.195-200
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• 2010

해상교통관제사 훈련에 관한 IALA 권고안 및 국제 기준에 근거하여, 현재 국내에서는 세 개의 훈련과정이 개설되어 운영 중에 있으며 이러한 훈련과정의 교육 효과 증진을 위해 시뮬레이터가 도입되어 사용 중에 있다. 그러나 현재 사용되고 있는 시뮬레이터에는 관제 대상 선박의 움직임에 대한 수학모델이 부정확하고 특정한 장소에만 설치가 되어 있어서 훈련에 제약이 많은 실정이다. 이에 본 연구에서는, 정확한 선박운동 수학모델을 이용함으로써 교육 효과를 높이고, 또한 인터넷 기반으로도 훈련이 가능하도록 함으로써 장소에 제약을 받지 않는 새로운 시뮬레이터를 설계 개발하였으며, 시범 운영을 통해 시스템의 기능을 검증하고 그 활용도를 평가하였다.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2008년도 학술대회 1부
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• pp.49-54
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• 2008

In order to do a maintenance task, a maintenance operator should learn the basic skills of the maintenance task such as assembly and disassembly (A/D). However, the key of the learning process is to learn the A/D task intuitively and naturally. Haptic guidance promises to give effectiveness and benefit qualitatively since a person can be trained to do the optimal task based on information that comes from an expert, database, or intelligent algorithms. By applying haptic guidance, a maintenance training process can be made more intuitive and natural in a virtual environment. This paper describes the development of a maintenance training system by using haptic guidance.

• International Journal of Safety
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• 제3권1호
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• pp.32-37
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• 2004

Recently KAERI has developed the severe accident management guidance to establish Korea standard severe accident management system. On the other hand the PC-based severe accident training simulator SATS has been developed, and the MELCOR code is used as the simulation engine. SATS graphically displays and simulates the severe accidents with interactive user commands. The control capability of SATS could make a severe accident training course more interesting and effective. In this paper the development and functions of the electrical hypertext guidance module HyperKAMG and the SATS-HyperKAMG linkage system for the severe accident management are described.

• Journal of the Korean Physical Society
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• 제73권9호
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• pp.1269-1278
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• 2018

Using the thawed Gaussian wave packets [E. J. Heller, J. Chem. Phys. 62, 1544 (1975)] and the adaptive reinitialization technique employing the frame operator [L. M. Andersson et al., J. Phys. A: Math. Gen. 35, 7787 (2002)], a trajectory-based Gaussian wave packet method is introduced that can be applied to scattering and time-dependent problems. This method does not require either the numerical multidimensional integrals for potential operators or the inversion of nearly-singular matrices representing the overlap of overcomplete Gaussian basis functions. We demonstrate a possibility that the method can be a promising candidate for the time-dependent $Schr{\ddot{o}}dinger$ equation solver by applying to tunneling, high-order harmonic generation, and above-threshold ionization problems in one-dimensional model systems. Although the efficiency of the method is confirmed in one-dimensional systems, it can be easily extended to higher dimensional systems.

• 대한인간공학회지
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• 제36권5호
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• pp.447-458
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• 2017

Objective: The purpose of this study is to present the basic guidelines for preventing human error by measuring and analyzing the risk of collision perceived by the ship operator in the collision risk situation by using Korea Coast Guard patrol ships. Background: In the last 5 years, 97.5% of the causes of ship collision occurred at the sea was caused by human factors. However, the rate of marine accidents due to human error has not been reduced yet. Experiments and researches on the ship operators using the ships in actual operation are rarely performed. Method: Using two K.C.G Ships on the sea, the ship measured by 30 persons who are the subject of the ship (ship operator) when both ships approach and the relative distance gradually decreases in four encounter situations, perceived ship collision risk (PSCR) data were analyzed by statistical analysis. Results: The age and boarding career of the ship operator in the situation of ship collision risks encountered a negative impact on perceived collision risk in all four opposing encounter situations S1 ($000^{\circ}$), S2 ($045^{\circ}$), S3 ($090^{\circ}$) and S4 ($135^{\circ}$) respectively. That is, the higher the age of the ship operator, the lower the perceived risk of collision and the lower the age, the higher the risk of collision. Also, there was a difference between the average of group A (20~30 years) and group B (40~50 years) according to age of the ship operators at $000^{\circ}$, $045^{\circ}$ and $090^{\circ}$ and there was no difference at $135^{\circ}$. The mean difference of the experience of boarding career was also significantly different between group A (less than 4 years) and group B (more than 5 years), but there was no significant difference at $135^{\circ}$. Conclusion: The results showed that age and boarding career of the ship operators had negative impact on perceived collision risk and there was a difference in perceived risk of collision according to age and abundance of boarding career. As a result, by focusing on the ship operators who are in the age group of 20~30 years old and have less than 4 years of experience in boarding the ship. It is expected that the effect of prevention of marine accidents can be expected by avoiding collision avoidance. Application: The results of this study can be used as policy data of related organizations to prevent human error of ship operators and as training data of training institutes.

• 한국항해항만학회지
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• 제48권3호
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• pp.214-220
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• 2024

원격제어는 자율운항선박의 원격 운용에 적용하기 위한 것으로, 운용자가 원격제어 시스템에서 생성되는 제어 데이터를 이용하여 수행한다. 성공적인 원격제어를 위해서는 원격제어 3원칙(안전성, 신뢰성, 가용성)의 준수가 필요한데, 이를 위해서 우선적으로 제어 데이터와 운용자 양쪽에 대한 원격제어 적합성이 확보되어야 한다. 또한, 원격제어 적합성 평가를 위해서는 실제 선박에 대한 실험이 필요한데, 현재 이와 관련된 국제규정이 마련되어 있지 않고, 실제 선박에 대한 실험은 위험하며, 많은 비용과 시간이 걸리는 등의 문제가 있다. 본 연구의 목적은 실제 선박조종에 사용된 제어장치들의 출력 값을 이용한 적합성 평가 방법의 개발에 있다. 이 연구에서는 선박 제어장치의 출력 값을 제어 데이터로 이용한 데이터 적합성과 출력 값에 대한 운용자의 추종 값을 이용한 운용자 적합성 등의 2가지 방법을 제안하였다. 실험은 국립한국해양대학교 실습선 '한나라'호의 원격제어를 위해 구성된 육상 원격제어 시스템을 이용하였다. 실험방법은 실습선의 제어장치에서 출력된 값에 대한 운용자의 추종 값을 획득함과 동시에 이 추종 값이 포함된 추종 데이터를 선박과 육상 사이에서 송수신하는 절차의 반복과정을 통해 수행하였다. 평가 결과, 데이터에 관한 송수신 성능은 원격운용에 적합한 것으로 나타났으나, 운용자의 추종 성능은 더 많은 교육과 훈련이 필요한 것으로 분석되었다. 그래서 제안한 평가방법은 원격제어의 3원칙 확보에 필요한 제어 데이터와 원격 운용자 양쪽의 적합성 평가와 분석에 적용 가능함을 알았다.

• Nuclear Engineering and Technology
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• 제54권2호
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• pp.749-763
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• 2022

The fulcrum of economic development is a sustainable supply of electricity. Nigeria is plagued with blackouts, with one of the lowest per capita electricity consumption in the world (circa. 120 kWh per capita). Hence, policies have been instigated to integrate electricity generation from nuclear power plants (NPP) on or before 2027. However, a critical requirement for NPP generation is the implementation of robust human resource development (HRD) programs. This paper presents the perspective of Nigeria in assessing human resources needs over the entire NPP lifecycle following the milestone approach and employing the IAEA's Nuclear Power Human Resource (NPHR) modeling tool. Three workforce organizations are in focus including the owner/operator, regulators, and construction workers following three decades timeframe (2015-2045). The results indicate that for the study period, a maximum of approximately 9045 personnel (73% construction workers, 24% owner/operator, and 3% regulators) should be directly involved in the NPP program just before the commissioning of the third NPP in 2033. However, this number decreases by about 73% (2465 personnel including 94% operator and 6% regulator) at the end of the study timeframe. The results can potentially provide clarity and guidance in HRD decision-making programs.