• Journal of the Korea Society of Computer and Information
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• v.15 no.10
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• pp.129-136
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• 2010

In this paper proposed the sensor fusion algorithm between a gyroscope and an accelerometer to maintain the inverted posture with two wheels which can make the robot body move to the desired destination. Mobile inverted robot fall down to the forward or reverse direction to converge to the stable point. Therefore, precise information of tilt angles and quick posture control by using the information are necessary to maintain the inverted posture, hence this paper proposed the sensor fusion algorithm between a gyroscope to obtain the angular velocity and a accelerometer to compensate for the gyroscope. Kalman Filter is normally used for the algorithm and numerous research is progressing at the moment. However, a high-performing DSP and systems are needed for the algorithm. This paper realized the robot control method which is much simpler but able to get desired performance by using the sensor fusion algorithm and PID control.

• Journal of the Korea Society of Computer and Information
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• v.18 no.5
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• pp.53-60
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• 2013

This paper proposed visualization tool for motion of snowboarding using Skeleton data obtained by the Microsoft's Kinect sensor. The BBP(Balanced Body Position) posture is a most basic motion in the Snowboarding. This posture is the primary technology for stable turns. The implementation of visualization tool to analyse the BBP posture of snowboard. comparative analysis with standard postures to the ankles, knees, hips and spine angle of joints and body tracking using coordinate information obtained by the Kinect Sensor. Analysis of the final results of the screen through the OpenGL library. This research result could be used to analysis for turn postures of snowboarding.

• Journal of the Korea Society of Computer and Information
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• v.26 no.1
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• pp.155-161
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• 2021

Recently, researches for military purposes such as precision tracking and mission completion using UAVs have been actively conducted. In particular, if the posture information of the leading UAV is estimated and the mission UAV uses this information to follow in stealth and complete its mission, the speed of the posture information estimation of the guide UAV must be processed in real time. Until recently, research has been conducted to accurately estimate the posture information of the leading UAV using image processing and Kalman filters, but there has been a problem in processing speed due to the sequential processing of the processing process. Therefore, in this study we propose a way to improve processing speed by applying methods that the image processing area is limited to the ROI area including the object, not the entire area, and the continuous processing is distributed to OpenMP-based multi-threads and processed in parallel with thread synchronization to estimate attitude information. Based on the experimental results, it was confirmed that real-time processing is possible by improving the processing speed by more than 45% compared to the basic processing, and thus the possibility of completing the mission can be increased by improving the tracking and estimating speed of the mission UAV.

• International Journal of Computer Science & Network Security
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• v.22 no.7
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• pp.206-212
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• 2022

Strengthening global geopolitical instability in the world leads to an aggravation of international conflicts; it destabilizes the domestic political situation in countries, violates the rights and freedoms of man and citizen, and also activates economic crime. The full-scale invasion of the Russian Federation on the territory of Ukraine and the deployment of military operations in a large territory of a sovereign country have created a number of destabilizing factors in the development of digital technologies and negatively affect the state and trends of digital marketing, which allows establishing interaction with a wide audience and facilitating the search for new customers in various places. The purpose of the research lies in substantiating the theoretical and applied principles for studying the features of digital marketing in the conditions of wartime posture in Ukraine. In the course of the research, general and special methods of economic analysis have been used and applied, namely: analysis and synthesis; analogies and comparisons; generalization and systematization; graphic and tabular methods. Regarding the results of the research of digital marketing in the conditions of wartime posture in Ukraine, it has been established that the intensification of the development of digital marketing is caused by the crisis phenomena of social-economic, social-political and military nature, as well as exacerbated by the challenges of the COVID-19 pandemic. It has been proven that highly developed countries use innovative digital technologies more effectively in the field of marketing, which indicates the importance of the Multidimensional Index of Digitization (the USA - MID: 0,92-0,92; the UK - MID: 0,80-0,97; Japan - MID: 0,80-0,88; Canada - MID: 0,78-0,81; Germany - MID: 0,78-0,88; France - MID: 0,72-0,76), however, the developing countries record much lower values (Ukraine - MID: 0,22-0,48). Accordingly, the level of cybersecurity in highly developed countries is also significantly higher than in transitive countries, in particular, in the United States (GCI: 0,919-0,999); Great Britain (GCI: 0,783-0,995); Canada (GCI: 0,818-0,978) and in Ukraine (GCI: 0,501-0,661).

• Journal of the Korea Society of Computer and Information
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• v.29 no.8
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• pp.93-101
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• 2024

The purpose of this study was to the effects of a cervical stabilization exercise using pressure biofeedback intervention on suboccipital muscle tone, deep neck flexor muscle endurance, and craniovertebral angle in college students with forward head posture. The subjects of the study were selected as BCSEG(n=12) and CG(n=12), and the intervention was performed for 50 minutes, 3 times a week for 8 weeks. The results of the study showed that after biofeedback neck stabilization exercises, the suboccipital muscle significantly decreased in stiffness and muscle tone in the BCSEG(p<.01), and the deep neck flexors significantly increased in muscle endurance(p<.01) and craniovertebral angle(p<.01). The results of the cervical stabilization exercises with biofeedback are thought to improve cranio- vertebral angle by improving muscle function of the suboccipital muscles and deep neck flexors, which cervical stabilization exercises with biofeedback may be suggested as an intervention to improve FHP.

• Proceedings of the Korean Society of Computer Information Conference
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• 2019.07a
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• pp.163-164
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• 2019

본 논문에서는 Kinect Sensor를 활용하여 사용자의 뒤틀린 자세를 교정하는데 도움을 줄 수 있는 어플리케이션을 설계하고 구현한다. 이 어플리케이션은 사용자의 자세 교정 부위 별로 분류하여 제시함으로써 체계적인 교정과 운동 효과를 볼 수 있는 장점이 있다.

• The Journal of the Korea Contents Association
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• v.8 no.6
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• pp.151-158
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• 2008

Poor posture of the neck and head has long been recognized as a factor contributing to the onset and perpetuation of pain in the head and neck region. This study were to evaluate the change of the neck pressure pain threshold in long term computer users. To elucidate change of the neck pressure pain threshold in long term computer users, the effect of computer using time(3, 6, 9, 12 and 15 hours) on neck pressure pain threshold were studied in 20 subjects. Neck pressure pain threshold were recorded 3, 6, 9, 12 and 15 hours group, and evaluated by pressure algometry to Trapezius muscle, Sternocleidomastoidius muscle, Suboccipitalis muscle and Temporalis muscle. Neck pressure pain threshold was significantly larger in 15 hours group(p<.05). But relation between neck pressure pain threshold in male group and female group were not significant differences(p>.05).

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.06a
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• pp.703-706
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• 2007

The real-time monitoring about the activity of the human provides useful information about the activity quantity and an ability. This study developed a system for human physical activity assessment in ambulatory monitoring using portable sensing device combining a tri-axial accelerometer and wireless sensor node. This real-time system is able to identify several postures, posture transitions and movements with classification algorithm. In addition, this system also features fall detection capability. The results of the assessment for evaluating the performance of the system show high identification accuracy.

• Journal of the Korea Computer Graphics Society
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• v.10 no.2
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• pp.42-50
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• 2004

캐릭터 애니메이션 기술의 발달로 가상공간에 애니메이트되는 캐릭터의 수가 점점 증가되고 있으며, 캐릭터 자체 골격구조의 관절 개수와 캐릭터를 덮고 있는 메쉬의 폴리곤 개수도 점점 증가하는 추세이다. 따라서, 실시간 가상환경에서 다수의 캐릭터를 전처리 과정 없이 시뮬레이션할 경우 전체 군중시스템 성능의 저하가 예상된다. 본 논문에서는, 이러한 문제점을 해결하기 위해 모션 다단계(motion level-of-detail) 기법을 제시한다. 모션 단순화 기법은 캐릭터의 움직임을 제어하는 골격(관절)구조와 캐릭터의 형태를 시각적으로 표현하는 기하(메쉬)구조를 단순화 하는 방법으로 기존 동작과 단순화된 동작의 차이를 최소화 한다. 골격구조 단순화를 위한 JPC(joint posture clustering)방법은 특정 관절의 연속된 모션 시퀀스에서의 유사 자세 집단을 추출하여 하나의 자세로 표현하는 방법으로, 모션의 특성에 따라 동적으로 관절을 단순화하여 관절 시뮬레이션 시간을 줄이는 방법이다. JPC방법은 골격구조가 시간에 따라 동적으로 변형되기 때문에 골격구조의 계층구조를 재 구축할 시간이 필요하지만, 기존 동작과 유사성을 잃지 않는 단순화된 동작 생성이 가능하다. 유사 자세 집단을 추출하기 위해 전체 모션 시퀀스에서 관절의 프레임간 자세 차이를 수식화하여 테이블 형태로 구성하고 이를 통해 기존 동작의 유사성을 잃지 않으며 관절의 단순화 율을 최대화 할 수 있는 알고리즘을 제시한다. 또한, 실시간 군중 환경의 성능을 더욱 향상시키기 위해 시간에 따라 변형되는 캐릭터 메쉬의 단순화 기법을 적용한다. 실험결과 모션 다단계 기법은 실시간 군중환경에서 캐릭터의 수가 많고 복잡한 골격구조와 기하구조로 구성된 관절 궤적의 변화가 심하지 않은 동작에 대해 특히 효율적이다.

• Journal of the Korea Society of Computer and Information
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• v.13 no.3
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• pp.153-160
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• 2008

One of the most important features of the Mobile Manipulator is redundant freedom. Using it's redundant freedom, a Mobile Manipulator can move in various modes, and perform dexterous motions. In this paper, to improve robot job performance, two robots -mobile robot, task robot- are joined together to perform a job, we studied the optimal position and posture of a Mobile Manipulator to achieve a minimum of movement of each robot joint. Kinematics of mobile robot and task robot is solved. Using the mobility of a Mobile robot, the weight vector of robots is determined. Using the Gradient method, global motion trajectory is minimized, so the job which the Mobile Manipulator performs is optimized. The proposed algorithm is verified with PURL-II which is Mobile Manipulator combined Mobile robot and task robot, and the results are discussed.