• 한국컴퓨터정보학회논문지
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• 제27권12호
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• pp.231-238
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• 2022

무선 통신의 발전과 IoT 센서의 발전으로 인해 휴대용 모바일 통신 장치와 센서 간의 근거리 무선 통신 기술들이 개발되어 다양한 응용서비스를 제공하는 고부가가치의 플랫폼으로 발전하고 있다. 본 논문에서는 비콘, 블루투스, UWB(Ultra-wideband), ZigBee, NFC(Near Field Communication), Z-Wave, 6LoWPAN(IPv6 over Low power WPAN), D2D(Device to Device) 등과 같은 근거리 무선 통신 기술 중에서, 실내 위치 측위를 제공할 수 있는 비콘을 기반으로 IoT 서비스 플랫폼을 제안하였다. 그리고 무분별한 비콘 스팸 신호를 차단하고 유연성과 확장성을 가진 REST 웹 서비스 기술을 적용하여 비콘 연동 웹서버를 설계하였다. 데이터 전송 성공률, 비콘 Push 차단 성공률, 위치 측위 정확도, IoT 연동 처리 성공률, REST 웹 서비스 기반 데이터 처리 성공률 등을 테스트하여 다른 기종 간의 데이터 접근성을 검증하였다. 설계된 IoT 서비스 플랫폼을 통해 향후 근거리 무선 통신 기반의 비즈니스 모델과 서비스 플랫폼에 대한 다양한 제안과 연구가 진행될 것이다.

• 대한통합의학회지
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• 제10권4호
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• pp.199-207
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• 2022

Purpose : The purpose of this study is to investigate the effect of shoulder stabilization exercise accompanied by application of a pelvic compression belt on the muscle activity, pain and function of the muscles around the shoulder in subjects with round shoulders. Methods : For the study method, 28 students who were enrolled in K University with a distance of 1 cm or more between the clavicle of the peak and the outer ear path were selected through GPS 400 global postural analysis system measurement. The subjects were randomly assigned to 14 participants in the group wearing a pelvic compression belt and 14 patients in the group not wearing a pelvic compression belt. In all subjects, the muscle activities of the middle trapezius, lower trapezius, and serratus anterior muscles and the shoulder pain disorder index (SPADI) were measured. The intervention was performed 3 times a week for 4 weeks, and the applied intervention was push-up plus and modified prone cobra exercise. The muscle activities of the middle trapezius, lower trapezius, and serratus anterior muscles and SPADI score were compared using dependent t test before and after intervention. Results : In this study, both groups showed that the muscle activity of the middle trapezius, lower trapezius, and serratus anterior significantly increased after the intervention compared to before the intervention. On the other hand, SPADI showed no significant difference. Conclusion : The results of this study showed that muscle activity in the peri-shoulder joint was increased after push-up plus and modified prone cobra exercise in both groups, regardless of whether pelvic compression was applied or not. Therefore, it was found that shoulder stabilization exercise using the pelvic compression belt also contributed to the enhancement of muscle activity in the joints around the shoulder.

• 문화기술의 융합
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• 제6권2호
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• pp.99-106
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• 2020

창암(蒼巖) 이삼만(李三晩)(1770~1845)은 조선 후기 3대 명필로 일컬어지며, '행운유수체(行雲流水體)'라는 독자적 서체를 창안하고, 호남지방에 동국진체(東國眞體)의 서풍을 계승·창달시킨 대서백(大書伯)이다. 그는 '서여기인(書如其人)'적(的) 인품고(人品高)와 사고법(師古法)를 통해 궁극적으로는 통령(通靈)의 경지를 추구하였다. 저서 『창암서결(蒼巖書訣)』를 통해 기본적으로 한위(漢魏) 해서를 숙련하여 근골이 확립되면 행서와 초서는 자동적으로 이루어진다고 강조하였다. 그리고 서(書)는 무릇 '자연'에서 비롯되었음을 자각하고, 법천귀진(法天貴眞) 정신을 통하여 유법(有法)의 단계, 나아가 무법이법(無法而法)의 통령(通靈)의 경지를 발현하였다. 또한, 노장(老莊)의 '우(愚)'의 철학과 거기에 근간한 '졸박미(拙樸美)'를 추구하여 신묘함을 얻을 수 있다는 심미관을 드러내었다. 이는 자연천성을 드러나게 하는 순자연(順自然)의 철학이자, 무지무욕(無知無欲)의 상태에서 자신의 진우(眞愚)를 지키는 미학이다. 이를 구현하기 위해 미추(美醜)와 선악(善惡)을 불분(不分)한 순자연적(順自然的)인 우졸미(愚拙美)를 지면에 발현하였다. 한편, 창암(蒼巖)은 모든 필법에 력(力)을 통하여 천연미와 생명미를 도모하였고, 력(力)을 적절히 운용하여 힘 있게 밀고 나가는 한대(漢代)의 추전(推展)이라는 용필법을 제시하였다. 특히 『창암서정운시(蒼巖書停雲詩)』에서 일운무적(逸韻無跡)한 필의는 음양대대(陰陽對待)의 조화를 이루면서 신체비동(神體飛動)한 생명력과 기괴적(奇怪的) 역동감이 넘친다. 또한, 포역함세(抱力含勢)의 추전미(推展美)가 위이불범(違而不犯)하여 득필천연(得筆天然)의 심미경지를 이루었으니, 창암(蒼巖)이 "해동제일(海東第一) 초서(草書)의 거장(巨匠)"이라는 진면목을 여실히 증명하고 있다.

• 한국산학기술학회논문지
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• 제17권8호
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• pp.449-455
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• 2016

본 연구에서는 Eurocode에서 제시하는 콘크리트 부재간 계면조건을 고려한 전단강도 설계식을 압축강도가 서로 다른 부재 연결부에 대해서도 적용할 수 있는지를 검토하기 위하여 전단실험을 수행하고 설계 평가식과 비교하였다. Eurocode에서 제시하는 전단강도 평가식의 변수를 고려하여 콘크리트 압축강도, 전단철근 보강비, 요철계면을 변수로 하는 부재를 제작하였고, 콘크리트층 간의 강도 차이와 요철계면의 유무에 따른 전단강도에 주안점을 두고 전단실험을 수행하였다. 실험을 통해 계측한 실제 전단강도를 Eurocode의 전단강도 평가식을 이용한 계산값과 비교하여 실제 전단강도 수준과 평가식과의 차이를 평가하였으며, 이종강도를 갖는 콘크리트 층에서 압축강도가 증가함에 따라 전단강도도 증가하며, 계면요철을 둔 연결부 전단강도는 설계기준의 평가식으로 계산한 값에 비해 20~50%까지 차이를 보이는 것으로 나타났다. 철근보강비가 작은 경우에는 계면요철에 의한 전단저항력이 전단강도에 주로 기여하며, 이 경우에는 계면에서의 급격한 파괴가 일어나는 현상과 전단강도 편차가 크게 나타남에 따라 평가식과 큰 차이를 보였다. 특히, 이종강도를 갖는 콘크리트 층의 전단강도는 압축강도 차이가 클수록 강도 평가식과 큰 차이를 보이는 것으로 판단된다.

• International Journal of Aeronautical and Space Sciences
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• 제12권1호
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• pp.84-91
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• 2011

A finite element analysis for the wing and landing gear of a composite target-drone air vehicle was performed. For the wing analysis, two load cases were considered: a 5g symmetric pull-up and a -1.5g symmetric push-over. For the landing gear analysis, a sinking velocity of 1.4 m/s at a 2g level landing condition was taken into account. MSC/NASTRAN and LS-DYNA were utilized for the static and dynamic analyses, respectively. Finite element results were verified by the static test of a prototype wing under a 6g symmetric pull-up condition. The test showed a 17% larger wing tip deflection than the finite element analysis. This difference is believed to come from the material and geometrical imperfections incurred during the manufacturing process.

• Elastomers and Composites
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• 제52권1호
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• pp.48-58
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• 2017

Thermoplastic elastomers (TPEs), a unique class of polymers, combine the processing ease of thermoplastics with the advanced properties of thermoset rubbers. TPEs can be remelted several times without any significant loss of properties, and can be molded into complex shapes using conventional processing equipment. Due to their characteristics, TPEs are ideal for use in a variety of applications in the automotive field. Although the TPE market of the Republic of Korea is currently at its niche, the increasing manufacturing push from major companies is expected to open up multiple opportunities for these products in the automotive sector. This manuscript highlights a detailed technological trend of the global automotive thermoplastic elastomers market.

• 보존과학연구
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• 통권30호
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• pp.189-202
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• 2009

Ceramics from Taean shipwreck were studied to investigate the deterioration by soluble salts and desalination pattern according to each ceramic characterization. NaCl crystals were found as a crystal growth on the ceramic microstructure and deteriorated to push off the glaze layer of some Puncheong ware sample. As a result of monitoring the desalination pattern of ceramics for 74days, the earthenware sample with big pores and no glaze removed soluble salts so fast, but Puncheong ware and Whiteware samples removed lots of soluble salts slowly and continuously. Generally, it takes long time to remove soluble salts from porcelains, due to small pores and glaze, but the long-term desalination probably can cause the damage on the surface layer such like glaze. As some soluble salts still remains in the ceramic microstructures after desalination, it is very important to control and keep the relative humidity stable through the proper storage. There are various ceramic deterioration patterns by soluble salts. Therefore, it needs to select the desalination method of ceramics from shipwreck, considering the material characteristics and the production techniques.

• 대한방사선기술학회지:방사선기술과학
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• 제41권6호
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• pp.637-641
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• 2018

To compare of body composition and backmusclestrength between physical activity group (PAG) and non-physical activity group (Non-PAG). From Jun 14 to July 13 2018, 66 students were divided into PAG (male 20, female 13) and Non-PAG (male 18, female 15) from questionnaires for general characteristics and activity. All participants were measured body composition (Inbody 720, Biospace, Korea) and backmusclestrength (T.K.K. 5402, TAKEI, Japan) after obtaining written informed consent. Statistical analysis was performed by independent t-test and cross-sectional test using SPSS ver. 19.0 (USA). Sex and body mass index were not significant difference between two groups. Exercise was significant difference between PAG and Non-PAG(100% vs. 45.5%, p<0.001), especially running and push-up, sit-up(p<0.001). Body composition was no significant difference between PAG and Non-PAG (p>0.05). Backmusclestrength was significantly higher in PAG than that in N on-PAG (p<0.01). It is suggested that exercise affects to Backmusclestrength.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권11호
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• pp.5344-5356
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• 2018

Nowadays with the help of Location-Based Social Networks (LBSNs), users of Point-of-Interest (POI) recommendation service in LBSNs are able to publish their geo-tagged information and physical locations in the form of sign-ups and share their experiences with friends on POI, which can help users to explore new areas and discover new points-of-interest, and promote advertisers to push mobile ads to target users. POI recommendation service in LBSNs is attracting more and more attention from all over the world. Due to the sparsity of users' activity history data set and the aggregation characteristics of sign-in area, conventional recommendation algorithms usually suffer from low accuracy. To address this problem, this paper proposes a new recommendation algorithm based on a novel Preference-Content-Region Model (PCRM). In this new algorithm, three kinds of information, that is, user's preferences, content of the Point-of-Interest and region of the user's activity are considered, helping users obtain ideal recommendation service everywhere. We demonstrate that our algorithm is more effective than existing algorithms through extensive experiments based on an open Eventbrite data set.

• International Journal of Computer Science & Network Security
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• 제24권3호
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• pp.83-92
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• 2024

It is a common observation that whenever any patient arrives at the front desk of a hospital, outpatient clinic, or other health-associated centers, they have to first queue up in a line and wait to fill in their registration form to get admitted. The long waiting time without any status updates is the most common complaint, worrying health officials. In this paper, UrNext, a location-aware mobile-based solution using Bluetooth low-energy (BLE) technology, is presented to solve the problem. Recently, a technology-oriented method has been gaining popularity in solving the healthcare sector's problems, namely the Internet of Things (IoT). The implementation of this solution could be explained through a simple example that when a patient arrives at a clinic for her consultation. There, instead of having to wait in long lines, she will be greeted automatically, receive a push notification telling her that she has been admitted along with an estimated waiting time for her consultation session. This will not only provide the patients with a sense of freedom but would also reduce uncertainty levels that are generally observed, thus saving both time and money. This work aimed to improve clinics' quality of services and organize queues and minimize waiting times in clinics, leading to patient comfortability and reducing the burden on nurses and receptionists. The results demonstrated that the presented system was successful in its performance and helped achieve high usability.