• The Korean Journal of Pain
• /
• 제24권2호
• /
• pp.69-73
• /
• 2011

Although the incidence of partial-thickness rotator cuff tears (PTRCTs) was reported to be from 13% to 32% in cadaveric studies, the actual incidence is not yet known. The causes of PTRCTs can be explained by either extrinsic or intrinsic theories. Studies suggest that intrinsic degeneration within the rotator cuff is the principal factor in the pathogenesis of rotator cuff tears. Extrinsic causes include subacromial impingement, acute traumatic events, and repetitive microtrauma. However, acromially initiated rotator cuff pathology does not occur and extrinsic impingement does not cause pathology on the articular side of the tendon. An arthroscopic classification system has been developed based on the location and depth of the tear. These include the articular, bursal, and intratendinous areas. Both ultrasound and magnetic resonance image are reported with a high accuracy of 87%. Conservative treatment, such as subacromial or intra-articular injections and suprascapular nerve block with or without block of the articular branches of the circumflex nerve, should be considered prior to operative treatment for PTRCTs.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2005년도 봄학술 발표회 논문집(I)
• /
• pp.107-110
• /
• 2005

In general, post tensioned (PT) flat plate slab systems have been used as a Gravity Load Resisting System (GLRS) in buildings. Thus, these systems should be constructed with Lateral Force Resisting Systems (LFRS) such as shear walls and moment resisting frames. When lateral loads such as winds or earthquakes occur, lateral load resisting systems undergo displacement by which connected gravity systems experience lateral displacement. Therefore, GLRS should have some lateral displacement capacity in order to hold gravity loads under severe earthquakes and winds. Since there are the limited number of researches on PT flat plate slab systems, the behavior of the systems have not been well defined. This study investigated the cyclic behavior of post tensioned flat plate slab systems. For this purpose, an experimental test was carried out using 4 interior PT flat plate slab-column specimens. All specimens have bottom reinforcement in the slab around the slab-column connection. Test variables of this experimental study are vertical load level and tendon distribution patterns.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2005년도 추계학술대회 논문집
• /
• pp.240-245
• /
• 2005

There has been a strong demand on more economic and lower depth girder bridges for short and medium span range, PRECOM, which is a new type steel-concrete composite girder, has been developed to realize a more economic bridge system with a lower depth girder. In the PRECOM girder bridge, a steel plate girder is simply supported and then concrete form is hung to girder. Thus, the self-weight of the concrete is loaded to the steel girder. To increase the resistance of concrete in the lower casing against tensile stress, compressive force is introduced by prestressed tendon To evaluate the manufacturability and performances of the completed bridge, four 15-m girders and a bridge specimen with two 20m girders wvere constructed. The camber during the construction and introduction of an appropriate compressive force was evaluated. Dynamic data were obtained through the modal testing of the completed girders. Static loading test was also conducted to examine cracks and evaluate the decrease in stiffness and failure behavior under extreme conditions.

• 고신대학교 의과대학 학술지
• /
• 제33권2호
• /
• pp.257-262
• /
• 2018

Guillain-$Barr{\acute{e}}$ syndrome (GBS) and acute disseminated encephalomyelitis (ADEM) are demyelinating neurologic disorders with different target organs. Although they share similar pathogenetic mechanism, reports of simultaneous occurrence of the 2 disorders are rare. A 2 year 6 month old girl visited our hospital for fever, cough, and general weakness. Although the muscle power of extremities showed mild weakness and voiding difficulty, initial deep tendon reflex of both knees and ankles was normal. A nerve conduction study to evaluate the weakness revealed the absence of F waves. Cerebrospinal fluid analysis demonstrated pleocytosis with lymphocyte predominance and elevated protein levels. Magnetic resonance imaging showed abnormal T2 hyperintensity in pons, medulla and spinal cord. Serum anti-GD1b antibody was positive. Based on clinical findings, laboratory findings, nerve conduction study, and neuroimaging, the diagnosis of GBS and ADEM was made. This is the first case of GBS accompanied by ADEM in Korea.

• 로봇학회논문지
• /
• 제14권3호
• /
• pp.221-227
• /
• 2019

This paper studies an effect of vibration on twisted string actuation inside conduit at high curvature angles. In our previous work. we have mentioned that twisted string actuators can be used to transmit power even at significant curvature angles of the conduit. However, several undesirable effects, namely pull-back, hysteresis, and chattering, were present during actuation due to friction between strings and the internal sheath of the conduit. This paper reports the results of experimental study on effects of vibration on twisted string actuation inside curved conduits. We have demonstrated that applying vibration generated near natural frequency of the system during the stages of twisting and untwisting cycles helped reduce pull-back and hysteresis and increase string contraction. In case when sheath was deflected by $180^{\circ}$ under a constant load of 3 kg, we were able to achieve over 40% decrease in pull-back and 30% decrease in hysteresis, compared with no vibration case.

• 한국정밀공학회지
• /
• 제10권4호
• /
• pp.200-205
• /
• 1993

In many applications, the typical parallel-jaw end-effector of a robot arm has been remarkably satisfactory. But, it is not adequate for the applications such as complicated manipulation. In the study, a finger with 4 joints (so, having redundancy) was consturcted to investigate the characteristics of an articulated hand. Each joint was driven by one actuator, and the motor torque was transmited to each joint through a tendon-pulley system. In the context, major considerations for hardware design and the method to solve the inverse kinematics of a redundant manipulator were presented. Finally, the basic capabilities of an articulated hand were presented through experiments.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2008년도 추계 학술발표회 제20권2호
• /
• pp.125-128
• /
• 2008

최근 국내교량구조물의 보수 보강에 있어 외부강선 보강공법이 널리 사용되고 있으며 그에 대한 연구가 활발히 진행되고 있다. 본 연구는 외부강선 보강공법중 시공성과 보강효율성이 뛰어난 개선된 인양홀 이용 정착장치를 개발하는 것을 목적으로 수행되었다. 본 연구에서는 선행연구에서 수행한 기 사용중인 인양홀 이용 정착장치의 거동에 관한 실험결과를 바탕으로 2가지 Type의 인양홀 이용 정착장치를 제안하였고, 총 6개의 실험체를 제작하여 실험을 수행하였다. 각 실험체의 보강효과를 분석하기 위해 처짐, 변형률 등을 측정하였고, 항복하중, 극한하중, 파괴양상 등을 비교 분석하였다.

• 로봇학회논문지
• /
• 제18권1호
• /
• pp.18-28
• /
• 2023

This study introduces a smart wrist band system with pressure measurements using wrist skin curvature variation due to finger motion. It is easy to wear and take off without pre-adaptation or surgery to use. By analyzing the depth variation of wrist skin curvature during each finger motion, we elaborated the most suitable location of each Force Sensitive Resistor (FSR) to be attached in the wristband with anatomical consideration. A 3D depth camera was used to investigate distinctive wrist locations, responsible for the anatomically de-coupled thumb, index, and middle finger, where the variations of wrist skin curvature appear independently. Then sensors within the wristband were attached correspondingly to measure the pressure change of those points and eventually the finger motion. The smart wrist band was validated for its practicality through two demonstrative applications, i.e., one for a real-time control of prosthetic robot hands and the other for natural human-computer interfacing. And hopefully other futuristic human-related applications would be benefited from the proposed smart wrist band system.

• 대한관절경학회지
• /
• 제4권1호
• /
• pp.13-18
• /
• 2000

목적 : 자가 골-슬개건-골 이식건과 동종 골-슬개건-골 이식건을 이용한 전방 십자 인대 재건의 효능을 주관적 및 객관적 기준을 이용하여 비교 조사하고자 하였다. 대상 및 방법 : 1993년 3월부터 1996년 6월까지 18례의 자가 골-슬개건-골 이식건과 24례의 동종 골-슬개건-골 이식건을 이용하여 한 명의 술자가 전방 십자 인대 재건술을 시행하고, 술 후 2년 이상 추시 되어진 두 그룹에서 증상, 이학적 검사 및 Telos stress arthrometer를 이용하여 비교하였다. 결과 : Modified Feagin Scoring System을 이용한 2년 이상 추시 만족도는 자가 건 이식 그룹과 동종건 이식 그룹이 각각 $88.9\%$와 $87.5\%$를 보였으며, Tegner activity score, 추시상 장력 검사, 관절 운동 범위, 대퇴 사두근부의 둘레 비교 등에는 큰 차이가 없었으나, 슬개-대퇴부 동통, 탄발음 및 이완 등의 슬개 대퇴부의 문제는 동종건 이식 그룹$(8.3\%)$보다 자가 건 이식 그룹$(33.3\%)$에서 더 많이 발생되어 통계학적으로 의미있는 차이를 보였다(p<0.05). 결론 : 동종 골-슬개건-골 이식건을 이용시에 슬개-대퇴부 동통 및 탄발음 등이 현저하게 적은 빈도를 보였으므로, 자가 이식건의 대용으로 사용이 가능할 것으로 사료된다.

• Journal of Acupuncture Research
• /
• 제22권1호
• /
• pp.29-39
• /
• 2005

십이경근(十二經筋)의 침구학적(鍼灸學的) 응용(應用)을 위하여 경사(經篩)의 형성과정(形成過程)과 그 본래의 의미에 대한 이해가 필요 할 것으로 사료되어 <<경근(經筋)>>에 기재된 십이경근(十二經筋)에 대한 분석(分析)을 통하여 다음과 같은 결론을 얻었다. 1. <<내경(內經)>>에 수록된 "근"(筋)의 의미는 근육(筋肉), 건,(腱) 표재정맥(表在靜脈), 신경(神經) 등의 개염(槪念)을 포괄하고 있으며, <<경근(經筋)>>에서는 근육(筋肉)과 건을(腱) 의미를 내포하고 있다. 2. 경근(經筋)의 순행노선(循行路線)은 사지말단(四肢末端)에서 두신(頭身)으로 향하는 향심주(向心注) 노선(路線)을 보이고 있으며, 경근(經筋)의 병후(病候)는 대부분 순행부위에 따른 전근(轉筋)이나 동통(疼痛)으로 이러한 병후(病候)는 <<족비(足臂)>>의 경맥병후(經脈病候)의 특징과 같은 것으로 "소생병(所生病)"의미를 내포하고 있다. 3. 십이경근(十二經筋)은 해부학적(解剖學的) 관찰에 의해 형성된 것이 아니라 십이경맥(十二經脈)의 순행노선(循行路線)을 참조로 전신의 근육(筋肉)을 십이구역(十二區域)으로 분류(分類)하여 형성된 것으로 "근"(筋)을 통하여 인체(人體)를 상하로 연계시키는 규율에 대해 또 다른 가설을 제시한 것으로 사료된다.