• Physical Therapy Rehabilitation Science
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• 제10권2호
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• pp.235-243
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• 2021

Objective: This study aimed to investigate the short-term effects of flexion-distraction spinal manipulation on intervertebral height, pain, spine mobility in patients with lumbar degenerative disc disease. Design: Randomized controlled trial with a pretest-posttest control group design Methods: A total of 96 participants with degenerative disc disease participated in the study and were randomly divided into two groups. Both groups received intervention for 3-5 minutes a day. The experimental group (n=48) underwent flexion-distraction spinal manipulation for 3-5 minutes, and the control group (n=48) was maintained in the same position as the experimental group for 5 minutes without any intervention. The intervertebral height was measured by computed tomography, pain was assessed using visual analog scale, and the spine in flexion mobility was measured using the finger-to-floor distance test and passive straight leg raise test. Pre-test and post-test measurements were obtained. Results: The experimental group showed significant improvement in intervertebral height, degree of pain, and spinal mobility (p<0.05). The intervertebral height increased from 6.32±1.90 to 6.93±1.85 mm (p<0.05), lower back pain decreased from 69.17±13.35 mm to 48.48±12.20 mm (p<0.05), lumbar spine mobility changed from 17.37±4.49 to 12.69±4.34 cm (p<0.05), and passive straight leg raise test range increased from 46.94±13.05° to 56.01±12.20° (p<0.05). Conclusions: This study suggests that flexion-distraction spinal manipulation could be an effective treatment for decreasing pain and improving function in patients with degenerative disc disease.

• Clinics in Shoulder and Elbow
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• 제24권4호
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• pp.202-208
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• 2021

Background: We aimed to assess the effect of plate hook bending in treatment of acromioclavicular (AC) dislocation by analyzing clinical and radiological results according to the angle of the plate hook (APH). Methods: This was a retrospective, observational, case-control study including 76 patients with acute AC joint dislocation that were divided into two groups according to treatment with bent or unbent plate hook. The visual analog scale (VAS), the American Shoulder and Elbow Surgeons (ASES) shoulder score, and range of motion (ROM) were evaluated as clinical outcomes. Comparative coracoclavicular distance (CCD) was measured to evaluate radiological outcomes. Results: While the VAS and ASES of the bending group at 4 months after surgery were significantly higher (p=0.021 and p=0.019), the VAS and ASES of the bending group at other periods and ROM of the bending group showed no significant difference. The initial CCD decreased from 183.2%±25.4% to 114.3%±18.9% at the final follow-up in the bending group and decreased from 188.2%±34.4% to 119.1%±16.7% in the non-bending group, with no statistical difference (p=0.613). The changes between the initial and post-metal removal CCD were 60.2%±11.2% and 57.3%±10.4%, respectively, with no statistical difference (p=0.241). The non-bending group showed greater subacromial osteolysis (odds ratio, 3.87). Pearson's coefficients for the correlation between APH and VAS at 4 months after surgery and for that between APH and ASES at 4 months after surgery were 0.74 and -0.63 (p=0.027 and p=0.032), respectively. Conclusions: The APH was associated with improved postoperative pain and clinical outcomes before implant removal and with reduced complications; therefore, plate hook bending is more useful clinically during plate implantation.

• 우주기술과 응용
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• 제1권1호
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• pp.7-22
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• 2021

본 논문에서는 국내 최초로 개발 중인 랑데부/도킹 기술검증용 초소형위성의 지상 환경에서의 도킹 단계 시험 결과에 대해 기술하였다. 랑데부/도킹 기술은 우주기술 중 고난이도 기술로서 우주 궤도상에서 상대 물체에 접근한 후 작업을 수행하는 데 매우 핵심적인 기술이기도 하다. 본 논문에서는 에어베어링 장치를 이용하여 체이서가 모의 타겟으로 접근하여 최종적으로 도킹하는 단계의 지상시험 결과에 대해 기술하고자 한다. 본 논문에서 검증된 2차원 평판에서 도킹 단계에서의 추력 제어 알고리즘과 시각 기반 센서를 이용한 상대물체 인식 및 상대거리 추정 알고리즘을 기반으로 추후에는 우주에서의 시험을 위한 3차원 공간에서의 랑데부/도킹 알고리즘으로 확장·개발하는 데 이용하고자 한다.

• 한국측량학회지
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• 제39권6호
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• pp.477-482
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• 2021

지하공간통합지도는 보안이 요구되는 기간시설 정보이나 지하공사 현장에서 굴착 공사 시 파열 사고 예방을 위하여 현장에 대한 모든 지하시설물의 정보를 제공하고 있다. 이러한 정보의 제공은 사용자에게 관심대상 이외 추가적인 정보를 제공함으로써 보안 데이터의 정보유출에 대한 위험성을 증가시키는 요인이 된다. 본 논문에서는 현장에서 지하공간통합지도 가시화시 작업자의 관심 대상 지하시설물에 대해서는 전체 가시화를 진행하시만 그렇지 않은 지하시설물은 가시화를 최소화 하여 보안 데이터 정보유출의 위험성을 최소화하는 가시화 필터링을 설계 및 구현하였다. 이를 위하여 관심대상 지하시설물들 각각에 대한 일정거리의 가시화 영역을 생성하고, 이를 공간 합집합 연산을 통해 통합된 가시화 필터를 생성하였다. 지하공간통합지도를 화면에 출력할 때 생성된 필터 정보를 사용하여 필터영역 안에 위치한 객체만 가시화를 하고, 밖에 존재하는 객체는 가시화를 하지 않음으로써 사용자에게 정보제공을 최소화 할 수 있다.

• Molecules and Cells
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• 제45권11호
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• pp.846-854
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• 2022

Neurons make long-distance connections via their axons, and the accuracy and stability of these connections are crucial for brain function. Research using various animal models showed that the molecular and cellular mechanisms underlying the assembly and maintenance of neuronal circuitry are highly conserved in vertebrates. Therefore, to gain a deeper understanding of brain development and maintenance, an efficient vertebrate model is required, where the axons of a defined neuronal cell type can be genetically manipulated and selectively visualized in vivo. Placental mammals pose an experimental challenge, as time-consuming breeding of genetically modified animals is required due to their in utero development. Xenopus laevis, the most commonly used amphibian model, offers comparative advantages, since their embryos ex utero during which embryological manipulations can be performed. However, the tetraploidy of the X. laevis genome makes them not ideal for genetic studies. Here, we use Xenopus tropicalis, a diploid amphibian species, to visualize axonal pathfinding and degeneration of a single central nervous system neuronal cell type, the retinal ganglion cell (RGC). First, we show that RGC axons follow the developmental trajectory previously described in X. laevis with a slightly different timeline. Second, we demonstrate that co-electroporation of DNA and/or oligonucleotides enables the visualization of gene function-altered RGC axons in an intact brain. Finally, using this method, we show that the axon-autonomous, Sarm1-dependent axon destruction program operates in X. tropicalis. Taken together, the present study demonstrates that the visual system of X. tropicalis is a highly efficient model to identify new molecular mechanisms underlying axon guidance and survival.

• 대한족부족관절학회지
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• 제27권2호
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• pp.58-66
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• 2023

Purpose: This study aimed to evaluate the effectiveness of deltoid ligament repair on syndesmotic stabilization in patients with acute ankle fractures with ruptured deltoid and syndesmotic ligaments. Materials and Methods: The medical records of 41 patients (41 ankles) who underwent surgery for Weber type B ankle fracture with ruptured deltoid and syndesmotic ligaments were retrospectively analyzed. The mean follow-up duration was 36 months (range 18~65 months). Patients were divided into two groups: those that underwent deltoid ligament repair (the deltoid group) and those who did not (the non-deltoid group). Both groups were also divided into two subgroups, namely, the D1/S1 group, which underwent syndesmotic screw fixation, or the D2/S2 group, which did not. Medial clear space (MCS), tibiofibular clear space (TFCS), anterior fibular line (AFL) ratio, and posterior fibular line (PFL) distance were measured, and visual analog scale (VAS), American Orthopaedic Foot and Ankle Society (AOFAS), and Foot Function Index (FFI) scores were evaluated. Results: TFCS changed significantly after surgery in the D2 and S1 groups (p=0.01, p=0.03, respectively). Subgroup MCSs, TFCSs, and AFL ratios were not significantly altered by surgery in the four subgroups (p=0.82, p=0.45, p=0.25, respectively). However, postoperative PFL distances were significantly different in the D2 and S1 groups and the S1 and S2 groups (p=0.02, p=0.02, respectively). Mean TFCS decreased significantly after surgery in the D2 and S1 groups. The postoperative VAS, AOFAS scores, and FFI were not significantly different between the subgroups (p=0.44, p=0.40, and p=0.46, respectively). Conclusion: Deltoid ligament repair seemed to restore ankle stability without addressing syndesmosis in Weber type B ankle fractures with rupture of deltoid and syndesmotic ligaments.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제17권5호
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• pp.1339-1355
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• 2023

Localization is a hot research spot for many areas, especially in the mobile robot field. Due to the weak signal of the global positioning system (GPS), the alternative schemes in an indoor environment include wireless signal transmitting and receiving solutions, laser rangefinder to build a map followed by a re-localization stage and visual positioning methods, etc. Among all wireless signal positioning techniques, Wi-Fi is the most common one. Wi-Fi access points are installed in most indoor areas of human activities, and smart devices equipped with Wi-Fi modules can be seen everywhere. However, the localization of a mobile robot using a Wi-Fi scheme usually lacks orientation information. Besides, the distance error is large because of indoor signal interference. Another research direction that mainly refers to laser sensors is to actively detect the environment and achieve positioning. An occupancy grid map is built by using the simultaneous localization and mapping (SLAM) method when the mobile robot enters the indoor environment for the first time. When the robot enters the environment again, it can localize itself according to the known map. Nevertheless, this scheme only works effectively based on the prerequisite that those areas have salient geometrical features. If the areas have similar scanning structures, such as a long corridor or similar rooms, the traditional methods always fail. To address the weakness of the above two methods, this work proposes a coarse-to-fine paradigm and an improved localization algorithm that utilizes Wi-Fi to assist the robot localization in a geometrically similar environment. Firstly, a grid map is built by using laser SLAM. Secondly, a fingerprint database is built in the offline phase. Then, the RSSI values are achieved in the localization stage to get a coarse localization. Finally, an improved particle filter method based on the Wi-Fi signal values is proposed to realize a fine localization. Experimental results show that our approach is effective and robust for both global localization and the kidnapped robot problem. The localization success rate reaches 97.33%, while the traditional method always fails.

• 패션비즈니스
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• 제27권3호
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• pp.35-49
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• 2023

The purpose is to derive its aesthetic characteristics by objectifying the visual image of the YouTube campaign into adjectives. As a result, we intend to identify advertising strategies that use them as basic data for setting fashion design concepts. A group of experts in fashion majors watched each of them, wrote adjectives, and collected 75 adjectives. By analyzing the frequency of adjectives, aesthetic characteristics were derived with adjectives recording the upper number of times, and the results were obtained that they had the characteristics of deconstruction. The conclusions of this study are as follows. First, Tamburin's Jenny appeared to be strange, scary, rambling and charming. Among the internal meanings of deconstruction due to spatial, social, and psychological distance from consumers, it can be said that T.P.O's mutual textuality and play of interaction. Second, Gucci Cruise be chosen rural, strange, wild, unharmonious, and difficult, which is a mixture of intertextuality and play of T.P.O. Third, The Excise Gucci Campaign parodies that juxtaposes six films directed by Stanley Kubrick, making them strange, retro, difficult, interesting, and wrong. Deconstructionist de-genre and de-boundary Fourth, Kenzo World is weird, dynamic, wrong, difficult, difficult, and confused, which correspond to T.P.O's interactive textuality, play of the second half, and destruction and decomposition among the external expressions of deconstruction. Fifth, Burberry Hero emphasized the aesthetic value of traditional men, so it was ostensibly wild, free, powerful, sensual, and fantastic. Compared to the lifestyle of men who usually work at work, this corresponds to play of second best.

• 한국컴퓨터정보학회논문지
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• 제29권1호
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• pp.77-84
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• 2024

본 논문에서는 컴퓨터 비전을 사용하여 6가지 측정값(눌린 단자의 길이, 단자 끝의 치수(폭), 눌린부분(와이어 부분, 코어 부분)의 폭)을 계산하여 와이어 하네스의 결함을 정확하고 빠르게 탐지할 것을 제안한다. 두 가지 유형의 데이터에서 Harris 코너 검출을 활용하여 물체의 위치를 탐지하고 측정 영역별 특징과 배경과 물체 사이의 음영 차이를 활용하여 각 샘플의 기울기를 반영하는 측정값을 추출하기 위한 기준점을 생성한다. 이후 유클리드 거리 방법과 보정 계수를 사용하여 예측값을 계산하는 방법을 통해 와이어의 위치 변화에 관계 없이 측정값을 예측할 수 있다. 각 측정 유형별로 99.1%, 98.7%, 92.6%, 92.5%, 99.9%, 99.7% 정확도를 달성하였으며, 모든 측정값에서 평균 97%의 정확도로 우수한 결과를 얻었다. 해당 검사 방법은 기존 검사 방법인 육안 검사의 문제점을 보완하고, 작은 양의 데이터만을 이용하여 우수한 결과를 도출 가능하다. 또한 이미지 처리만 이용하기 때문에 딥러닝 방법보다 더 적은 데이터와 비용으로 적용 가능할 것으로 기대된다.

• 한국음향학회지
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• 제25권4호
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• pp.191-196
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• 2006

인간은 일반적으로 공간의 크기에 대한 정보를 시각에 의존한다. 그러나 청각적 경험이 중시되는 공연공간이나 다수의 음원을 활용하는 멀티미디어 환경 및 자동차의 캐빈 등에서는 시각적으로 큰 차이가 없는 상황에서도 제공되는 청취환경에 의해서 공간의 크기를 다르게 지각하게 된다. 본 연구는, 단일공연장내 상이한 위치에서 청각적으로 지각되는 공간의 규모를 청취실험을 통하여 측정 분석하였으며, 동일위치에서 측정된 건축음향파라메타와의 상관관계분석을 통하여 영향요인들을 살펴보았다. 실험결과, 공연장의 크기에 대한 청각적 인상은 음악적 명료도(clarity)에 의해 크게 좌우되며, 음원과의 거리, SPL등에 의해 영향을 받는 것으로 나타났다. 또한 각기 다른 4종류의 연주악기를 이용한 음향 선호도 평가결과, 성악을 제외한 오케스트라, 첼로, 플룻의 경우 공간적 규모감이 작은 것을 선호하였다. 반면, 성악의 경우 공간적 규모감과의 유의적인 상관관계가 나타나지 않았다.