• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.12
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• pp.418-424
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• 2019

The present study investigated the effects of the moment arm length on balance and walking when carrying a backpack. In total, 30 normal adults without orthopedic and neurological injuries were assessed. For each subject, balance and gait were measured under three conditions: 1) the no backpack condition, 2) the general backpack condition, and 3) the decreased length of moment arm backpack condition. There were significant differences in the center of the pressure area and velocity between the three conditions, whereas there was no significant difference in the center of the pressure area and velocity according to the moment arm length. There were significant differences in double limb support time and walking velocity under the three conditions, and there was a significant difference only in double limb support time according to the moment arm length. The results of the present study showed that a change in the length of the moment arm can be helpful for walking when carrying a backpack.

• Proceedings of the Korea Contents Association Conference
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• 2018.05a
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• pp.69-70
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• 2018

최근 각종 IT제품을 사용하는 사람들이 증가하면서, 양손 사용의 자율성과 효율적인 수납공간을 가진 백팩의 수요가 증가하고 있다. 하지만 장시간 백팩 사용으로 인해 척추나 어깨, 목 등의 부담을 호소하는 사람도 늘어나는 추세이다. 이러한 점을 바탕으로 백팩 사용자의 양 어깨끈과 어깨 사이의 압력을 측정하고, 이 측정값을 통해 척추나 어깨의 부담에 대한 솔루션을 제공할 수 있는 사물인터넷 기반 백팩 헬스케어 앱을 제안하였다. 본 연구의 결과로 백팩 사용자들이 스스로 헬스케어를 할 수 있도록 도와 척추나 어깨의 부담으로 인한 질병 예방에 활용될 수 있을 것으로 기대한다.

• Journal of the Korea Convergence Society
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• v.10 no.11
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• pp.225-232
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• 2019

This study aims to compare muscle activities of trunk and lower extremities according to wearing/not-wearing and forms of backpack. Twenti-six healthy adults were participated in the study. In the backpack with 10% body weight, trunk and lower extremities were measured during carrying the no backpack state(NBs), general backpack state(GBs), a decrease moment arm backpack state(DMBs). The muscle activity in a fore muscles(Obilique, Quadriceps, Tibialis anterior, Gastrocnemius) were analyzed with using wireless electromyogram measuring system. DMBs showed significant improvemet in obilique, quadriceps and gastrocnemius muscle RVC.

• The Journal of the Korea Contents Association
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• v.17 no.10
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• pp.334-342
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• 2017

Due to the development of telecommunication technology, the relay broadcasting system is changing rapidly. The introduction of the wireless mobile communication relay (DMNG) method has enabled the one-man relay, which has resulted in absolute reductions in terms of equipment and manpower. However, it is a reality that the basic level of broadcasting such as broadcasting stability and image quality is becoming less complete. This paper analyzes wireless telecommunication relay equipment and broadcasting system called 'backpack', and discusses future development plan. To do this, we analyze the success and failure cases of backpack relay broadcasting and present concrete plans.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.3
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• pp.312-320
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• 2020

3D scanning began in the field of manufacturing. In the construction field, a BIM (Building Information Modeling)-based 3D modeling environment was developed and used for the overall construction, such as factory prefabrication, structure construction inspection, plant facility, bridge, tunnel structure inspection using 3D scanning technology. LiDARs have higher accuracy and density than mobile scanners but require longer registration times and data processing. On the other hand, in interior building space management, relatively high accuracy is not needed, and the user can conveniently move with a mobile scan system. This study derives considerations for the development of Simultaneous Localization and Mapping (SLAM)-based Scan Backpack systems that move freely and support real-time point cloud registration. This paper proposes the mobile scan system, framework, and component structure to derive the considerations and improve scan productivity. Prototype development was carried out in two stages, SLAM and ScanBackpack, to derive the considerations and analyze the results.

• Proceedings of the Korea Contents Association Conference
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• 2011.05a
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• pp.269-270
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• 2011

숄더백과 백팩을 멜 때의 척추자세의 변화양상이 각각 다름에도 불구하고 백팩에 비해 숄더백을 멜 때의 인체자세 변화에 대한 생체역학적 연구는 부족하다. 본 연구의 목적은 숄더백을 멜 때 무게증가에 따라 몸통자세의 변화양상을 분석하는 것이다. 몸통자세의 변화를 측정하기 위하여 3차원 동작분석시스템을 사용하였고, 가방무게는 3가지 조건(5, 10, 15 kg)과 통제조건(0 kg)으로 정하였다. 실험 결과 몸통전방기울기와 몸통측방기울기는 무게가 증가함에 따라 유의하게 증가하였다. 요추의 수평면상 축회전이 무게가 증가함에 따라 반시계 방향으로 유의하게 증가하였다. 흉추에서는 무게 증가에 따른 움직임의 변화가 유의하게 나타나지 않았다. 이러한 결과는 숄더백을 멜 때 척추자세 변화가 요추와 흉추에서 다르게 나타남을 의미한다. 본 연구에서 제시된 생체정보 분석기술은 일상생활에서의 인체정보 컨텐츠를 축적하는데 매우 유용할 것으로 기대 된다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2017.11a
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• pp.151-154
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• 2017

기존 중계시스템은 모든 신호들이 유선으로 연결되어 있어 중계차가 접근 할 수 없는 지역에서는 운용의 어려움 등 이동과 거리에 제약이 있다. 또한 수많은 케이블이 필요하기 때문에 결선작업이 복잡하고 작업시간이 오래 걸리는 단점을 가지고 있어 무선 중계 시스템을 이용하여 프로그램을 제작하면 이러한 문제점을 해결할 수 있다.. 이에 본 논문에서는 RF무선영상송수신기와 백팩 LTE등 무선중계시스템의 장단점을 비교분석하였고 이에 통해 효율적인 무선중계시스템을 설계하였다. 또한, 제안된 시스템을 이용하여 방송중계업무의 편리성이 극대화하고 새로운 형태의 방송 포맷을 개발할 수 있도록 하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.11a
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• pp.562-565
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• 2017

본 연구는 일상에서 길을 찾는 데 어려움을 겪은 보행자나 초행길을 낯선 여행자들을 대상으로, 스마트폰과 더불어 사람들이 많이 지니고 다니는 가방을 가지고 적용하였다. 스마트폰의 LBS, 블루투스 기능과 가방에 부착된 진동 인터페이스가 연결되어 실시간 경로 안내를 받을 수 있는 제품이다. 부가적인 기능으로는 앱 상에 회원관리 기능이 있어 개인의 이용 기록에 관한 데이터가 DB에 저장되며 DBMS를 통한 데이터 분석으로 사용자에게 맞춤화된 서비스를 제공해 줄 수 있다. 또한 여러 사용자들이 이용한 플랫폼에 쌓인 데이터를 가지고 새로운 비지니스를 창출할 수도 있다. 추가적으로 일정 거리 이상 멀어지면 신호의 강도가 약해지는 블루투스의 특성을 이용하여 이용자가 가방과 일정 거리 이상 떨어질 경우, 스마트폰으로 팝업 창을 띄워주는 형태로 분실 방지 기능을 제공해 줄 수도 있다.

• Physical Therapy Korea
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• v.27 no.1
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• pp.45-52
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• 2020

Background: A backpack is available equipment for moving some objects. Most studies have found that the appropriate weight limit of backpack for students is between 10% to 15% of their body weight (BW). However, Some students should carry a backpack heavier than 15% of BW. Therefore, It is associated with abnormal shoulder and neck posture on students. Objects: This study tested the effects that various amounts of weight carried by university students in their backpacks had on their cervical posture and electromyography of neck muscle. Methods: The subjects consisted of 12 students (6 male, 6 female) in university. There were three loading conditions tested: no backpack, a backpack that weighed 10% and 15% of the student's BW. The dependent variables were the craniovertebral angle (tragus to C7) and the neck muscle activities (sternocleidomastoid, upper trapezius). All 12 subjects were asked to walk while wearing a backpack for 5 minutes and were then instructed to rest for 2 minutes. Results: When assessing the craniovertebral angle, the results of this study were significantly decreased in the order of 0%, 10%, and 15%. And then, there were significantly increased electromyography of neck muscles that comparison of the weight of 10% and 15% on 0%. It was found that as the weight of the backpack increased, the craniovertebral angle decreased (p < 0.05) and the muscle activities increased (upper trapezius p = 0.012, sternocleidomastoid p = 0.013). Conclusion: Our study recommended that some students shouldn't carry on over the 15% backpack of own weight, and also they should distribute backpack load to equal on body for optimal posture.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.28 no.5D
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• pp.735-740
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• 2008

The Design manual for adjusting the capacity and LOS of facilities has been shared in urban railways and high-speed railway stations. However, the pattern of urban railways users and those of high-speed railway users are different from each other. For an example, the high-speed railway users tend to carry voluminous luggages and the transportation disadvantaged such as children and the elderlies. Accordingly, we see that the scale of facilities and the station itself should be constructed differently. The transfer facilities in the high-speed railway stations are classified widely into walking assisting facilities and convenient facilities. We invented the concept of PME (Pedestrian Moving Equivalent) and PWE (Pedestrian Waiting Equivalent)for the spatial calculation of those who are with wheeled luggages, back packs, and children to reflect the uniqueness of users in high-speed railway stations. These equivalents have been applied to the design of the facilities to asses the new Capacity and LOS that are users' favored.