• 국제물리치료학회지
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• 제11권2호
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• pp.2052-2059
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• 2020

Background: Kinesiology taping (KT) is a method that helps immediately increase muscle activation, strength and joint stability by being attached to various skeletal muscles and structures of the body. Objectives: To investigate the effect of KT applied below the hyolaryngeal complex on the movement of the hyolaryngeal complex during swallowing in patients with dysphagia after stroke. Design: One-group, pre-post design. Methods: Twenty individuals with dysphagia after stroke participated in this study. KT was applied to the sternum and both clavicles from the hyolaryngeal complex. We analyzed the motion of the hyolaryngeal complex during swallowing with and placebo KT and KT using the Image-J software with videofluoroscopic swallowing study. In addition, a 0-to-10 numerical rating self-report scale was used to check the required effort and resistance felt during swallowing. Results: KT condition showed that the anterior and superior movement of the hyoid bone during swallowing was significantly lower than placebo KT (P<.05, all). Also, KT condition showed that the anterior and superior movement of the larynx during swallowing was significantly lower than placebo KT (P<.05, all). In result of statistical comparison between KT group and placebo KT group, the KT group showed significantly higher self-report scale score than the placebo KT group in terms of two category; the required effort and resistance felt (P<.05, all). Conclusion: This study demonstrated that KT applied below the hyolaryngeal complex inhibits the anterior and superior movement of hyoid bone and larynx during swallowing of patients with dysphagia after stroke.

• Physical Therapy Rehabilitation Science
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• 제9권2호
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• pp.113-119
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• 2020

Objective: The vibration device is one of the most commonly used warm-up devices not only for healthy athletes but also for healthy individuals. Therefore, this study aimed to investigate the immediate effects of local vibration on ankle plantar flexor muscle activation and peak torque in healthy adults. Design: One-group pretest-posttest design. Methods: This was a single-group study comprising a total of 36 (16 males and 20 females) participants. The average age of the 36 participants was 22.3 years. All the participants' concentric and eccentric peak torques of the gastrocnemius lateralis muscle were measured using an isokinetic device. Simultaneously, the participants' muscle activity was measured by surface electromyography. After the pre-experimental data were collected, the participants comfortably sat on the prepared chair with their hips and knees flexed to 90°. While in sitting position, local vibration was applied for 10 minutes using a 1:1 ratio intermittent pulsing mode device based on a previous study. Then, the post-experimental data were collected immediately after the local vibration by performing a similar process performed during the pre-experimental data collection. Results: The results showed a significant difference in muscle activity and eccentric peak torque (p<0.05). On the contrary, concentric peak torque values showed an insignificant difference with pre- and post-value. Conclusions: The results of this study demonstrated that local vibration can be possibly considered as one of the effective ways to increase ankle plantar flexor muscle activity and muscle performance, specifically the eccentric peak torque, in healthy adults.

• 한국건축시공학회지
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• 제17권1호
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• pp.1-8
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• 2017

최근 전 세계적으로 폭탄테러 및 폭발사고가 빈발하여, 인명 및 재산피해가 증가하고 있다. 따라서 방호 방폭 성능을 갖는 고성능 시멘트 복합재료(HPFRCC)에 대한 관심이 증가하고 있다. 이에 본 연구에서는 최적의 HPFRCC를 군부대 시설에 실제적으로 적용하기에 앞서 유 무기 복합섬유 혼입율 및 ERCO 혼입율 변화에 따른 HPFRCC의 기초적 특성 및 자기수축 저감 성능을 분석하고자 하였다. 그 결과, 적절한 유동성, 강도, 자기수축저감 효과를 종합적으로 고려할 때 복합섬유(SS+OL) 혼입율 1.5%에 ERCO 0.5%의 혼입이 가장 효과적인 것으로 평가 되었다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2005년도 추계종합학술대회
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• pp.508-511
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• 2005

가까운 미래에는 유비쿼터스 컴퓨팅과 유비쿼터스 네트워크를 통해 새롭고 다양한 서비스가 창출될 것이다. 특히, 언제 어디서나 사람과 사물 등의 객체의 위치를 인식하여 이를 기반으로 양질의 서비스를 제공하는 유비쿼터스 위치 기반 서비스(Ubiquitous Location Based Services: u-LBS)가 중요한 서비스의 하나로 대두되고 있다. 사물의 위치 인식을 위한 방법으로 RF를 이용한 위치 인식 방법은 있으나 USN과 접목한 방법에 관한 연구는 아직 미미한 실정이다. 본 연구는 RF 및 USN 기술을 이용하여 사물의 위치를 인식하기 위한 방버벵 관한 연구로서 여러 센서 모듈들이 주고받는 RF 신호의 세기 정보를 이용하여 위치를 인식한다. 그리고 향후 연구 내용으로서 날씨, 온도 등과 같이 신호의 세기에 직간접적으로 영향을 줄 수 있는 다양한 조건들을 반영함은 물론 유전자 알고리즘을 이용하여 사물의 위치를 보다 정확하게 인식하기 위한 최적화 방법에 대하여 논의한다.

• Restorative Dentistry and Endodontics
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• 제26권6호
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• pp.464-484
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• 2001

When restoring a tooth, the dentist tries to choose the ideal material for existing situation. One criterion that is considered is its suitability for restoring coronal strength. As more tooth structure is removed, the cusps are weakened and susceptible to fracture. Further, this increased deformation may cause the formation of intermittent gaps at the margin between the hard tissue and the restoration, facilitating marginal leakage. The improvements in ceramic materials now make it possible for alternatives to amalgams, composites, and cast metal to be of offered for posterior teeth. Of the materials used, ceramics most closely approximates the properties of enamel. The introduction of computer-aided design/computer-aided manufacture(CAD/CAM) systems to restorative dentistry represents a major technological breakthrough. It is possible to design and fabricate ceramic restorations at a single appointment. Additionally, CAD/CAM systems eliminate certain errors and inaccuracies that are inherent to the indirect method and provide an esthetic restoration. The aim of this investigation was to study the loading characteristics of CAD/CAM ceramic inlay and to compare the stress distribution and displacement associated with different designs of cavity(the isthmus width and cavity depth). A human maxillary left first premolar was prepared with standard mesio-occlusal cavity preparation, as recommended by the manufacturer Ceramic inlay was fabricated with CEREC 2 CAD/CIM equipment and cemented into the prepared cavity. Three dimensional model was made by the serial photographic method. The cavity width was varied $\frac{1}{3}$, $\frac{1}{2}$ and $\frac{2}{3}$ of intercuspal distance between buccal and lingual cusp tip. The cavity depth was varied 1.5mm and 2.3mm. So six models were constructed to simulate six conditions. A point load of 500N was applied vertically onto the first node of the lingual slope from the buccal cusp tip. The stress distribution and displacement were solved using ANSYS finite element program(Swanson Analysis System). (omitted)

• 한국산학기술학회논문지
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• 제8권1호
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• pp.96-102
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• 2007

용접에 의해서 발생하는 변형은 강구조물의 치수를 변화시킬 뿐 아니라 역학적 강도를 저하시켜 강구조물의 제작공정과 공용중 심각한 문제를 발생시킬 수 있다. 특히 토목 강구조물의 경우 제작 및 조립공정에서 용접프로세스에 의해 불가피하게 발생하는 용접변형에 의한 설계치수의 변화를 검토하기 위해 넓은 장소에서 부분 또는 전체가 조립공정을 실시해야 한다. 이러한 가조립된 구조물은 현장에 설치되기 위해 해체하여 운반되어 현장에서 재조립하여 가설된다. 또한 높은 곳에서 작업해야 하므로 안전사고의 우려와 함께 크레인, 족장과 같은 부대장비를 사용해야 하므로 비경제적이다. 따라서 대형 강구조물의 제작시 발생하는 용접변형에 의한 부재오차를 검증하기 위한 가조립 공정을 생략하기 위해 용접변형 예측기법의 개발이 요구된다. 본 연구에서는 이를 위해 대형 강구조물의 용접변형 예측기법인 등가하중법을 이용한 용접부 수치모델링을 정립하고 이를 이용해 용접순서와 자중이 용접변형에 미치는 영향을 검토하였다.

• 폴리머
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• 제31권2호
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• pp.141-147
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• 2007

치아 수복용 충전제로서 인체 뼈의 주성분인 수산화인회석(hydroxyapatite)이 혼성화된 바륨실리케이트 (barium silicate, BaSi)를 사용하여 제조한 고분자 복합체의 치과적 물성을 분석하였다. 복합체 제조에 사용된 아크릴계 기재는 가시광선을 사용하여 경화시켰다. 실험 결과, 혼성화된 충전제 내에서의 BaSi 함량이 증가할수록 복합체의 기계적 강도는 일정하게 증가하였으며 치의학에서 규정한 값들을 상회하여 치아 수복재료로 충분한 값임을 확인할 수 있었다. 그러나 충전제 내에서의 BaSi 함량 증가에 따른 복합체의 내마모도는 약간 감소하였다. 한편, 복합체의 중합깊이는 충전제의 구성비에 관계없이 $6\sim9mm$ 정도로서 일반적 치과용 수복재료로 충분한 값들임을 확인하였으며 중합전환율과 중합수축률은 충전제 구성비에의 직접적 의존 경향성은 거의 없음을 확인할 수 있었다.

• Restorative Dentistry and Endodontics
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• 제25권2호
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• pp.180-192
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• 2000

One bottle system was recently developed in order to simplify the clinical skills and save chair time after continuous improvements on dentin bonding agents. There has been many studies to measure the bond strength of one bottle systems but no actual work has been done on micromorphologic study of resin-dentin interdiffusion zone after one bottle system application. To evaluate the bonding patterns of various commercially available one bottle systems to dentin, observation of resin-dentin interdiffusion zone under TEM was performed. Caries-free human third molars within one month of extractions were chosen for the experiments. The molars were sectioned 1mm above the cementoenamel junction and got rid of the root portions. Crown portions of the teeth were sectioned parallel to occlusal surface so that dentin discs of 1mm in thickness were remained. 7 one bottle systems and 1 two bottle system were applied according to manufacturer's instructions and followings were the results. 1. In every experimental groups, cross bandings of collagen fiber were distinguishable and tight bon dings between the bonding agents and dentin were observed. 2. Hybrid layer was clearly observed in ONE-STEP$^{(R)}$, Prime & Bond$^{(R)}$ 2.1, Syntac$^{(R)}$ SC, MAC-BOND II groups but it was not clear in Single Bond, D-Liner Dual PLUS, ONE COAT BOND groups. 3. Electron-density of hybrid layer was uniform in pattern in MAC-BOND II, Prime & Bond$^{(R)}$ 2.1 groups but not so uniform in ONE-STEP$^{(R)}$ group. 4. Electron-dense amorphous phase in most superior layer of the resin-dentin interdiffusion zone was characteristically observed in Single Bond, Syntac$^{(R)}$ SC, ONE COAT BOND groups. It can be concluded that bondings between the dentin bonding agents and dentin can be various in pattern according to their chemical compositions and the condition during applications.

• Restorative Dentistry and Endodontics
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• 제21권2호
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• pp.470-488
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• 1996

The end products of the metabolism of the oral microorganism, organic acids, are an element that produces dental caries. Four organic acids in plaque fluid, lactic acid, acetic acid, succinic acid, propionic acid which take the important role in producing dental caries, were chosen to evaluate the effect of acid type and concentration. The subject, $100{\mu}m$ in thickness, were immersed in acid-buffer solution which has the different acid concentration of 10mM, 25mM, 50mM, 100mM and pH 4.3 and degree of saturation was $0.153{\pm}0.003$ kept in constant and were operated to produce artificial caries under different demineralization time (1, 2, 3 day) at x25. The results were obtained by observing under polarizing microscope at x25. 1. The subsurface lesion, specific finding of incipient enamel caries, showed positive birefringence. but surface zone and sound enamel showed negative birefringence. 2. The demineralization rate of enamel was increased as the acid concentration increased. 3. The subsurface lesion showed increasing depth in the order of lactic, acetic, propionic acid, succinic acid. 4. The concentration of organic acid in artificial caries system had an independent effect on demineralization rate in enamel under the constant pH and degree of saturation. The result of this study showed that not only pH and the acid strength but the concentration of organic acid had an independent effect on demineralization rate in early enamel caries. And through the further research on the factors influencing enamel demineralization, it will be necessary to develop an effective caries preventive therapy.

• 한국지능시스템학회논문지
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• 제17권5호
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• pp.648-653
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• 2007

인간의 감정을 모방하여 다양한 외부 자극에 대해 인위적으로 감정을 생성하는 인공 감정에 관한 연구가 최근에 시작되어 이루어지고 있다. 그러나 기존의 인공 감정 연구에서는 외부 감정 자극에 대한 감정 상태를 선형적, 지수적으로 변화시킴으로써 감정 상태가 급격하게 변하는 단점을 갖고 있다. 본 논문에서는 외부 감정 자극의 강도와 빈도뿐만 아니라 자극의 반복 주기를 감정 상태에 반영하고, 시간에 따른 감정의 변화를 시그모이드 곡선 형태로 표현하는 인공 감정 생성 모델을 제안한다. 그리고 기존의 감정 자극에 대한 회상을 통해 외부 감정 자극이 없는 상황에서도 감정을 생성할 수 있는 인공감정 시스템을 제안하고 컴퓨터 모의실험 결과를 통해 그 효용성을 보인다.