• 융합신호처리학회논문지
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• 제7권1호
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• pp.38-44
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• 2006

The omnidirectional mobility of a mobile robot may lose significance in motion control, unless the isotropy characteristics of the mechanism is maintained well. This paper investigates the local and global isotropy of an omnidirectional mobile robot with three caster wheels. All possible actuations with different number and combination of rotating and steering joints are considered. First, the kinematic model based on velocity decomposition and the algebraic conditions for the local isotropy are obtained. Second, the geometric conditions for the local isotropy are derived and all isotropic configurations are fully identified. Third, the global isotropy index is examined to determine the optimal parameters in terms of actuation set, characteristic length, and steering link length.

• Journal of Periodontal and Implant Science
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• 제29권3호
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• pp.539-553
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• 1999

The purpose of this 6-months study was to compare the clinical and radiographic outcomes following guided tissue regeneration treating human mandibular Class II furcation defects with a bioabsorbable BioMesh barrier(test treatment) or a nonabsorbable ePTFE barrier(control treatment). Fourteen defects in 14 patients(mean age 44 years) were treated with BioMesh barriers and ten defects in 10 patients(mean age 48 years) with ePTFE barriers. After initial therapy, a GTR procedure was done. Following flap elevation, root planing, and removal of granulation tissue, each device was adjusted to cover the furcation defect. The flaps were repositioned and sutured to complete coverage of the barriers. A second surgical procedure was performed at control sites after 4 to 6 weeks to remove the nonresorbable barrier. Radiographic and clinical examinations(plaque index, gingival index, tooth mobility, gingival margin position, pocket depth, clinical attachment level) were carried out under standardized conditions immediately before and 6 months after surgery. Furthermore, digital subtraction radiography was carried out. All areas healed uneventfully. Surgical treatment resulted in clinically and statistically equivalent changes when comparisons were made between test and control treatments. Changes in plaque index were 0.7 for test and 0.4 for control treatments; changes in gingival index were 0.9 and 0.5. In both group gingival margin position and pocket depth reduction was 1.0mm and 3.0mm; clinical attachment level gain was 1.9mm. There were no changes in tooth mobility and the bone in radiographic evaluation. No significant(p${\leq }$0.05) difference between the two membranes could be detected with regard to plaque index, gingival index, gingival margin position, pocket depth, and clinical attachment level. In conclusion, a bioabsorbable BioMesh membrane is effective in human mandibular Class II furcation defects and a longer period study is needed to fully evaluate the outcomes.

• 한국엔터테인먼트산업학회논문지
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• 제13권5호
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• pp.239-246
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• 2019

본 연구는 여대생의 라이프 케어 증진을 위한 둥근 어깨 자세의 작은가슴근, 어깨 가동성, 목 관절 가동 범위 의 상관관계를 알아보았다. 둥근 어깨 자세를 가진 성인 여성 80명을 대상자로 선정하였다. 대상자가 누운 자세에서 어깨의 높이를 측정하여 둥근 어깨 자세를 측정하였고, 작은가슴근의 길이, 어깨 가동성, 목 관절가동범위를 측정하여 상관분석을 한 결과는 다음과 같다. 오른쪽 둥근 어깨와 목 폄의 상관계수는 -.23(p<0.05)이었다. 오른쪽 작은가슴근 지수와 목 왼쪽 가쪽 굽힘의 상관계수는 -.25(p<0.05)이었고, 오른쪽 작은가슴근 지수와 목 굽힘 상관계수는 -.25(p<0.5)이었다. 왼쪽 어깨 가동성과 목 왼쪽 가쪽 굽힘의 상관계수는 -.23(p<0.05)이었고, 왼쪽 어깨 가동성과 목 오른쪽 돌림의 상관계수는 -.23(p<0.5)이었으며, 왼쪽 어깨 가동성과 목 왼쪽 돌림의 상관계수는 -.25(p<0.05)로 통계학적으로 유의한 음의 상관관계가 있었다(p<0.05). 이상의 결과로 오른쪽의 둥근 어깨가 심할수록 목폄이 감소하였고, 오른쪽 작은가슴근이 단축될수록 목 왼쪽 가쪽 굽힘과 목 굽힘이 감소하였으며, 왼쪽 어깨 가동성이 증가할수록 목 왼쪽 가쪽 굽힘은 감소하였고, 오른쪽 돌림과 왼쪽 돌림이 감소하였음을 알 수 있었다.

• Journal of Korean Neurosurgical Society
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• 제60권1호
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• pp.60-66
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• 2017

Objective : Sacral insufficiency fracture (SIF) contributes to severe low back pain. Prolonged immobilization resulting from SIF can cause significant complications in the elderly. Sacroplasty, a treatment similar to vertebroplasty, has recently been introduced for providing pain relief in SIF. The purpose of this study is to investigate the clinical short-term effects of percutaneous sacroplasty on pain and mobility in SIF. Methods : This study is conducted prospectively with data collection. Sixteen patients (3 men and 13 women) with a mean age of 77.5 years (58 to 91) underwent sacroplasty. Patients reported visual analogue scale (VAS; 0-10) and Oswestry disability index (ODI; 0-100%) scores. VAS and ODI scores were collected preoperatively and again at one day, one month, and three months postoperatively. Questionnaires measuring six activities of daily living (ADLs) including ambulating, performing housework, dressing, bathing, transferring from chair, and transferring from bed were collected. Ability to perform ADLs were reported preoperatively and again at three months postoperatively. Results : The mean preoperative VAS score ($mean{\pm}SD$) of $7.5{\pm}0.8$ was significantly reduced to $4.1{\pm}1.6$, $3.3{\pm}1.0$, and $3.2{\pm}1.2$ postoperatively at one day, one month, and three months, respectively (p<0.01). The mean ODI score (%) also significantly improved from $59{\pm}14$ preoperatively to $15.5{\pm}8.2$ postoperatively at one month and $14.8{\pm}8.8$ at three months (p<0.01). All ADL scores significantly improved at three months postoperatively (p<0.01). Conclusion : Percutaneous sacroplasty alleviates pain quickly and improves mobility and quality of life in patients treated for SIF.

• 한국재난정보학회 논문집
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• 제17권3호
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• pp.655-666
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• 2021

연구목적:본 연구는 대용량 차량궤적 자료를 이용하여 동적 과속 위험성을 측정하기 위한 방법론을 개발하고, 개발된 과속 지표의 적용성을 증명하는데 있다. 연구방법: 개별 차량 궤적을 이용하여 차량의 속도 변화를 미시적 시공간으로 분석하고, 사고 위험성 관점에서 과속의 경계(즉, 경계속도)를 결정하였다. 결정된 경계속도를 이용하여 미시적 시공간 기반 과속 노출도 지표를 개발하였다. 연구결과: 검증 연구는 대용량 차량 GPS 궤적 자료와 실제 교통사고 자료를 이용하여 수행되었다. 분석결과, 개발된 과속 노출도 지표는 고속도로 교통사고에 대해 우수한 설명력 (R²=0.7)을 보였다. 이는 미시적 시공간 차원에서 과속이 분석되어야 함을 직접적으로 의미한다. 결론:차량 속도 상태의 시공간적 변화는 매우 가변적이다. 따라서 본 연구에서 제시된 방법론은 차량 궤적 자료를 이용한 미시적인 공간기반 교통사고 요인 및 사고 위험 노출도 분석에 효과적으로 활용될 수 있을 것으로 판단된다.

• Physical Therapy Rehabilitation Science
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• 제10권2호
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• pp.134-140
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• 2021

Objective: The purpose of this study was to investigate the alteration of upper cervical manipulation to autonomic nervous system (ANS) through the heart rate variability(HRV) analysis in young healthy individuals. Design: Two-group pretest-posttest design. Methods: Thirty four young healthy participants (17 males and 17 females) were randomized into the 2 groups, such as the upper cervical manipulation group (UCM group, n=17), neck stretching group (NS group, n=17). UCM group received a upper cervical manipulation, especially on the atlas, and NS group did stretch for both side of upper trapezius and levator scapular. For the UCM, Atlas mobility was checked by therapist and thrust was given once at the posterior arch of Atlas. HRV was measured before and after intervention to investigate ANS alteration. After the intervention, both groups were given 3 minutes break-time before measuring HRV. Results: The UCM group showed significant differences in ANS Activity, Stress Resistance, Stress index and Fatigue Index (p<0.05) while no differences in NS group with before and after intervention. There were significant differences in ANS Activity, Stress Resistance, and Fatigue Index between groups (p<0.05). Conclusions: This study suggected that upper cervical manipulationhas positive effects on the ANS activity, stress resistance, and fatigue index.

• 한국IT서비스학회지
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• 제20권5호
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• pp.177-187
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• 2021

The global economy has been very difficult due to the recent impact of COVID-19. Korea is also pushing for strong quarantine policies such as K- quarantine and social distancing, but the economy is hardly recovering. In particular, the economic situation began to change rapidly depending on the export and domestic market, the public's interest in the economy increased, and companies became more sensitive. In order to estimate this rapidly changing economic situation, major advanced countries have also developed models that can periodically monitor the economy at the government level. Through this, by periodically reporting the economic trends, the public and companies can be aware of the economic trends to some extent. This study analyzed the cases of weekly business trends in advanced countries and developed a model of weekly economic activity suitable for Korea. To verify this, indices closely related to the economy such as mobility, industrial activity, face-to-face consumption, and psychology were discovered and estimated. As a result of the study, the weekly economic activity index was judged to be very useful in capturing short-term real economic activity. In the future, in order to secure the robustness and stability of the index and to increase the reflection of reality, model improvement and parameter estimation should be performed regularly.

• 한국임상수의학회:학술대회논문집
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• 한국임상수의학회 2008년도 추계학술대회
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• pp.188-188
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• 2008

• 대한치과의사협회지
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• 제22권11호통권186호
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• pp.953-960
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• 1984

The author applied the attachment fixation overdenture on the patient whose residual alveolar ridge height was poor to increase mechanical denture retention, and observed the periodontal condition of the abutment roots after insertion of attachment fixation overdenture. The author obtained the conclusions as follows; 1. Attachment fixation overdenture showed better mechanical retention than conventional overdenture did, but it resulted unfavorable crown-root ratio. 2. Within one year after insertion, there were not significant changes in periodontal health, which was indicated by plaque index, gingival index, pocket depth, tooth mobility gingival hyperplasia and alveolar bone change. 3. Mild periodontal thickening was observed. 4. This study emphasized the importance of adequate follow-up care and home care instructions.

• Journal of Periodontal and Implant Science
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• 제28권2호
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• pp.273-280
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• 1998

This study was to compare the patients wearing comfortable distally extending cantilever bridges (DECBs) with those having discomfortable ones, in the aspect of the periodontal condition & prosthodontic status. The subjects in the present study were 164 patients appointed to Seoul National University Dental Hospital. One group was consisted of 101 patients wearing comfortable DECBs and the other group were made of 64 patients who had felt discomfort. On clinical parameters, there were no significant difference between 2 groups in plaque index, tooth mobility & probing depth, but gingival index was higher in group wearing discomfortable DECBs. In prosthodontic status, the ratio of pontic oversize was higher in the group of discomfortable DECBs, but there were no significant difference in the view of crown overcontour, overhanging margin & interproximal space closure between 2groups. This study failed to clarify causal factors of discomfortable DECBs.