• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.1811-1812
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• 2015

대형화, 복잡화 되어가는 대형 기계설비의 위험상황에 대한 실제 훈련은 소요시간 및 비용 증가, 훈련자 안전 확보의 어려움, 반복적인 훈련 및 평가가 어렵기 때문에 가상현실을 이용한 훈련 시뮬레이터가 대안으로 제시되고 있다. 본 논문에서는 대형 기계설비 안전대응 시뮬레이터에서 수행된 훈련에 대한 훈련자 피드백 및 평가를 위하여 개발된 시스템을 소개한다. 가상현실 기반 훈련 시뮬레이터에서 수행한 훈련결과 데이터를 활용하여 훈련 시나리오 내 임무수행 여부, 수행시간/거리에 대한 정량적 평가와 함께 훈련자의 훈련동작 데이터와 표준동작과의 비교를 통하여 효율적인 훈련을 위한 피드백을 수행할 수 있다. 또한 평가 결과의 시각화를 통해 직관적인 훈련개선이 가능하도록 하였다. 개발된 훈련평가 시스템을 활용하여 효과적인 훈련자 피드백 제공 및 반복적인 훈련 수행을 통한 안전대응 능력 향상이 가능할 것으로 판단된다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2011.06a
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• pp.183-184
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• 2011

본 논문에서는 양항비를 이용하여 스키점프 시각화 도구를 구현하였다. 스키점프는 점프대에서 도약시의 가속도와 맞바람을 통한 양력을 이용하여 활공하는 스포츠이다. 다양한 영향 요소 중에서도 점프의 거리가 가장 중요한데 이는 받음각에 따른 양력과 항력의 비인 양항비에 의해 결정된다. 기존 연구에서 최적의 양항비를 계산하여 이미 표준적인 받음각과 스키의 벌림각, 구부린 각 등은 잘 알려져 있다. 그러나 이러한 영향 인자의 변화에 따른 시각화 도구는 미흡한 실정이다. 본 논문에서는 양항비를 이용하여 사용자에게 직관적인 자세 시각화 도구를 제공한다. 구현을 위하여 OpenGL을 이용하여 그래픽을 표현하고 기존의 수학적 모델을 이용하여 사용자가 요구하는 인자의 변화에 따른 자세변화를 보인다. 본 논문의 결과물은 더 나은 스키점프을 위한 참고자료로 활용될 수 있을 것이다.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.11a
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• pp.171-174
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• 2007

최근에 인간과 컴퓨터의 상호작용을 위한 입력장치 중 테이블-탑 디스플레이라는 멀티터치 입력장치가 활발히 연구되고 있다. 본 논문에서는 테이블-탑 디스플레이라는 환경에서 인간에게 가장 직관적인 도구인 손을 사용하여 입력된 온라인 필기 숫자를 전처리하는 방법을 제안한다. 테이블-탑 디스플레이 환경에 적합한 전처리 기법으로 대표점 추출을 위한 거리 필터링과 획 구분 및 잡음제거 등을 사용하였고, 데이터를 16방향 체인코드로 변환하였다. 이는 실제 필기운동 시의 궤적을 크게 왜곡 시키지 않으면서 테이블-탑 디스플레이가 갖는 환경에 기인한 잡음을 없애고, 데이터양을 줄일 수 있는 장점이 있다. 총450개의 필기 숫자 데이터를 사용하여 실험한 결과, 잡음이 제거되고 데이터양이 줄어들었으며 인식에 용이한 체인코드를 형성해 내었다.

• Korean Journal of Remote Sensing
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• v.37 no.6_1
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• pp.1647-1656
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• 2021

In order to reduce the spread of infection due to COVID-19, South Korea has established a four-step social distancing standard and implemented it by changing the steps based on the rate of confirmed cases. The implementation of social distancing brought about a change in the amount of activity of citizens by limiting social contact such as movement and gathering of people. One of the data that can intuitively confirm this is Night Time Light (NTL). NTL is a variable that can measure the size of the national economy measured using lights captured by satellites, and can be used to understand people's social activities during the night. The NTL visible data is obtained via the Visible Infrared Imaging Radiometer Suite (VIIRS) Day-Night Band (DNB) onboard the Suomi National Polar-orbiting Partnership (S-NPP) satellite. 1023 of Suomi data from 1 January 2019 until 26 October 2021 were collected to generate time series of NTL radiance change over Seoul to analyze the correlation with social distancing policy. The results show that implementing the level of social distancing generally decreased the NTL radiance both in spatial disparities and temporal patterns. The higher level of policy, limiting human activities combined with the low number of people who have been vaccinated and the closure of various facilities. Because of social distancing, the differences in human activities affected the nighttime light during the COVID-19 pandemic, especially in Seoul, South Korea. Therefore, this study can be used as a reference for the government in evaluating and improving policies related to efforts reducing the transmission of COVID-19.

• Journal of the Korea Computer Graphics Society
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• v.24 no.4
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• pp.39-54
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• 2018

Recently, augmented reality(AR) based building information applications using a smart phone provide information in the static form irrespective of the distance between a user and a target building. If many target buildings are located close to each other, discrimination of information is reduced due to overlapping information objects. Furthermore, it is difficult to intuitively grasp the current position of the user in the previous AR-based applications. In this paper, to solve these limitations, we have designed and implemented a novel building information system in which the location and size of information objects are adaptively displayed according to locations of a user and target buildings, and which allows users to intuitively understand their location by providing a 3D map that displays the user's location and all target buildings within a given distance in real-time. The AR-based building information application proposed in this paper focuses on the building guide in Deoksu Palace in Jung-gu, Seoul.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.37 no.11
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• pp.1037-1046
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• 2013

In this study, the establishment of the criteria for accurate measurement is investigated via a statistical analysis of experimental results. The magnitude of influence on measurement errors is severely affected by the number of paths, mounting angle of sensor, straight pipe length in sequence, and Reynolds number. Three-dimensional numerical analysis has been conducted to understand the flow patterns downstream of a double bent pipe. Numerical analysis shows that the results well agreed with the experimental ones in case of a sensor mounting angle of $0^{\circ}$ and L/D = 3, 5 of $45^{\circ}$, $135^{\circ}$ in a single path. As a result, when the Reynolds number is 700,000-1,400,000, the sensor error of a single-path ultrasonic flowmeter is reduced with the mounting condition of L/D = 3, $45^{\circ}$.

• Journal of Korea Game Society
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• v.13 no.6
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• pp.95-110
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• 2013

Current up-to-date courses of study put emphasis on raising creative students. However, the cramming methods of teaching mathematics in the school seems far from the creativity and the number of students who feels mathematics difficult is increasing. To overcome this situation, the government proposed 'the mathematics education using storytelling', which leads to lots of developments of mathematics using serious game in many areas. However most of the current serious games couldn't do away with the deductive framework of mathematics, which makes it impossible to achieve the purpose of raising creative students. This is because existing mathematics serious games have not deeply contemplated many aspects such as the purpose and theories of teaching and teaching mathematics. Therefore, in order to overcome the limitations of cramming methods in existing mathematics educations, this research proposes the new method of developing serious game contents for elementary geometry that is useful to improve mathematical intuition, based on RME, the theory of teaching/learning mathematics.

• Journal of KIISE:Computing Practices and Letters
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• v.13 no.4
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• pp.226-230
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• 2007

In the conventional desktop PC environment, keyboard and mouse are used to process the user input and monitor displays the visual information as an output device. In order to manipulate the digital information, we move the virtual cursor to select the desired graphical icon on the monitor The cursor represents the relative motion of the physical mouse on the desk. This desktop metaphor does not provide intuitive interface through human sensation. In this paper, we introduce a novel tangible interface which allows the user to interact with computers using a physical tool called "Smartpuck". SmartPuck system bridges the gap between analog perception and response in human being and digital information on the computer. The system consists of table display based on a PDP, SmartPuck equipped with rotational part and button for the user's intuitive and tactile input, and a sensing system to track the position of SmartPuck. Finally, we will show examples working with the system.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.32 no.4D
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• pp.291-303
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• 2012

In order to lead safe driving, it is better to provide dynamic and detailed information on how the driver using the relevant road should behave as concerning movements of individual car rather than providing monotone and static information of reducing of speed to unspecified drivers. Assuming road and communication of highway where real-time collection and transfer of information on vehicles and road traffic status is possible, the purpose of this study was to provide real-time safe distance by considering road traffic condition such as road condition and driving condition, travel speed and distance between preceding/following vehicles. We intended to provide basic information about dangerous situation by defining different values of condition based column ($C_{condition}$) in accordance with the road surface condition, based on which Real-time Safety Distance Index(RSDI) is to be calculated comprehensively reflecting speed of preceding and following vehicles, distance between vehicles, vertical alignment and road surface condition on the scope of expression column ($C_n$). We intended to enable the driver to secure safety by providing the calculated Real-time Safety Distance Index (RSDI) so that the driver can intuitively sense and sufficiently cope with a dangerous situation where collision of vehicles may occur. The calculated RSDI value is comprised of 30 unit columns and will be provided to the driver being divided into risk evaluation grades of 3 predetermined steps, 'warning', 'dangerous' and 'normal'.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.5
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• pp.7-13
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• 2020

This paper focuses on detecting abnormal patterns of respiration of humans. In this study, a contact-based device was used to acquire both normal and abnormal respiration signals. To this end, this paper reports the development of a monitoring system to investigate the respiratory status of humans in a normal environment. This work aims to classify the respiratory status, i.e., normal and abnormal status, quantitatively. The respiration signal is acquired using a contact-based medical device (BIOBPAC), and noise reduction is carried out before classifying the respiratory status. To reduce noise, a mixed filter that combines the Savitzky-Golay filter and Median filter is applied to the acquired respiration signals. The inter-class distance is maximized, and the intra-class distance is minimized. The proposed algorithm is straightforward and can be applied to a practical environment. In addition, the experimental results are provided to substantiate the proposed approach.