• 한국정밀공학회지
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• 제20권6호
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• pp.47-54
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• 2003

As a tool for strain measurement to work with screw driven or hydraulic material test systems, in which mechanical vibration is inherent, SSDG (Speckle Strain/Displacement Gage), ESP (Electronic Speckle Photography) and its 3-dimension version SDSP are evaluated for the theory and practical appliance. Through tension test of steel strips, their validity and shortcomings are examined. As the results, it has been shown that, although SSDG and ESP provide direct measurement of in-plane strain in one direction, they are so sensitive to the out-plane displacement. On the other hand, SDSP which is aided with DIC (Digital Image Correlation) technique to trace the movement of the speckles provides not only in-plane 2-dimensional displacement field, but also out-of-plane displacement simultaneously. However, because the DIC is time-consuming, not automated yet and it needs post-processing to evaluate strain from the displacement field, SDSP appears to be not adequate as a real time sensor.

• 대한치과의사협회지
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• 제11권2호
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• pp.134-138
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• 1973

The author measured and analyzed the condyle path inclinations of 25 normal Korean adults roentgeno-cephalometrically and following conclusions were obtained. In protrusive movement of mandible, the angle of condyle pation inclination in relation to 1) occlusal plane is 19.86±8.25, 2) Frankfort Horizontal plane is 28.32±8.56, 3) Camper line is 12.22±4.06, 4) Nasion-sella line is 36.80±8.54.

• Journal of Oral Medicine and Pain
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• 제30권4호
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• pp.411-426
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• 2005

이갈이나 이악물기 시 근활성, 하악의 이동, 악관절에 가해지는 부하, 그리고 교합에 미치는 영향 등에 대한 연구는 많았으나 하악운동에 미치는 영향에 대해서는 연구가 적었다. 따라서 측두하악장애의 주요한 기여요인으로 간주되는 이악물기나 강한 씹기에 의해 나타나는 하악의 미세한 운동양태에 대해서는 더 많은 연구가 수행될 필요가 있으며, 이에 본 연구에서는 하악의 비틀림 회전운동을 중심으로 이악물기 및 강한 씹기의 영향을 조사하였다. 저작계 이상이 없는 건강한 남자 14명을 선정하여 교합고경 및 형태의 변화와 수의적 이악물기 수준의 차이가 이악물기 및 씹기 운동 시 나타나는 하악의 비틀림 회전운동(torque rotational movement)에 미치는 영향을 조사하였다. 각 교합조건과 이악물기 힘에서의 씹기 운동은 먼저 나무젓가락(분리기)이 없는 한 번의 이악물기와 나무젓가락을 구치부에 위치시킨 상태에서 두 번에 걸친 씹는 운동 등 세 번의 하악운동으로 구성되었다. 본 연구의 결론은 다음과 같다. 1. 좌측으로 씹을 때와 우측으로 씹을 때 간에 전두면 및 시상면상 운동거리는 두 가지 이악물기 힘 모두에서 차이가 없었으나 하악의 운동속도는 다른 양상을 보여 강한 이악물기에서는 차이가 없었으나 약한 이악물기에서는 좌측으로 씹을 때 우측에 비해 속도가 다소 빠른 경향을 보였다. 이때 하악의 비틀림 회전운동각은 두 가지 이악물기 모두에서 전두면상 차이는 거의 없었으나 수평면상 각도에서는 씹는 측에 따라 차이가 있는 경향을 보였다. 2. 이악물기 힘의 차이는 전두면 및 시상면상 운동거리와 속도에 영향을 미쳐 강한 씹기에서 약한 씹기에 비해 측정치가 크게 나타났으며 하악의 비틀림 회전운동각 역시 강한 씹기에서 수평면상 운동각이 다소 증가된 양상을 보였다. 3. 전두면 및 시상면상 개구거리는 교합조건에 따른 차이를 보였는데, 즉 웨이퍼나 레진블록 등 교합고경이 높은 교합형태일수록 운동거리가 감소하였으며, 이때 강한 씹기에서는 운동속도 역시 유사한 양상으로 감소하였다. 그러나 하악의 비틀림 회전운동각은 전두면 및 수평면 모두에서 교합조건에 따른 차이를 거의 나타내지 않았다. 4. 세 번의 씹는 운동에서 분리기가 없는 경우에 비해 있는 경우에서 대체로 전두면상 회전운동각을 제외한 나머지 하악의 비틀림 회전운동량은 모두 증가하는 양상을 보였다. 그러나 이때 각 교합형태 간 동일항목의 비교에서는 전두면상 회전운동거리가 이악물기 힘에 따른 차이를 보여 약한 이악물기에서 유의한 변화를 나타내었다. 이상의 연구를 통해 하악 비틀림 회전운동의 전체적인 양상은 관찰면에 따라 다르게 나타나 이악물기 힘에 따른 차이는 전두면에 비해 수평면상 측정치가 더 많이 변화되는 모습을 보였으나 교합조건에 따른 양상은 관찰면 간 차이를 보이지 않았다. 한편 이악물기 및 씹는 운동 각각에서의 하악 비틀림 회전운동량은 교합조건이나 이악물기 힘에 관계없이 대체로 분리기 씹기에 의해 수평면상 회전운동량의 변화가 전두면상 측정치에 비해 더 유의하게 나타났다.

• Structural Engineering and Mechanics
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• 제34권3호
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• pp.335-350
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• 2010

Out of plane behaviors of walls and infills are investigated in this paper, using rigid block concepts. Walls and infills are sometimes separated from top beams because of in plane movement of the walls and crumbling mortar layers under the top beams. Therefore, sufficient strength should be supplied to hold them against out of plane forces. Such walls are studied here under some real and scaled earthquakes, regarding their out of plane behavior. Influences of some reinforcements, connecting the walls to frames or perpendicular walls, are also studied. It is shown that unreinforced walls of regular sizes (3 m high and 4.5 m long) are normally unstable in the earthquakes. However, performing some reinforced bars that connect them to adjacent elements- frames or perpendicular walls - stabilizes them. Eventually, it is concluded that supplying 3 reinforced bars at 1/4, 2/4 and 3/4 of the panel's height stabilizes the walls in the assumed earthquakes. In this regard, for 20 cm and 35 cm thick walls ${\Phi}$18mm and ${\Phi}$20mm bars are to be used, respectively. For walls with other configurations, the forces and required areas of the reinforcements can be determined by the developed method of this paper.

• The Korean Journal of Pain
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• 제34권2호
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• pp.201-209
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• 2021

Background: Inguinal hernia repair is one of the most commonly performed surgical procedures. Regional blocks might provide excellent analgesia and reduce complications in the postoperative period. We aimed to compare the postoperative analgesic effect of the ultrasound-guided transversalis fascia (TF) plane block versus the transmuscular quadratus lumborum (QL) block in patients undergoing unilateral inguinal hernia repair. Methods: Fifty patients enrolled in this comparative study and were randomly assigned into two equal groups. One group received an ultrasound-guided QL block. In comparison, the other group received an ultrasound-guided TF plane block. The primary outcome was the patient-assessed resting, and movement-induced pain on the numeric pain rating scale (NRS) measured at 30 minutes postoperatively. Secondary outcomes included the percentage of patients receiving rescue analgesia in the first postoperative day, ease of performance of the technique, and incidence of adverse effects. Results: There were no statistically significant differences in NRS at rest and with movement between the groups over the first 24 hours postoperatively. The proportion of patients that received postoperative rescue analgesics during the first 30 minutes postoperatively was 4% (n = 1) in the QL group compared to 12% (n = 3) in the TF group. However, the mean performance time of the TF block was shorter than that of the QL block, and the performance of the TF block appeared easier technically. Conclusions: The ultrasound-guided TF plane block could be as effective as the QL block in lowering pain scores and decreasing opioid consumption following non-recurrent inguinal herniorrhaphy.

• 대한치과교정학회지
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• 제30권5호
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• pp.643-655
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• 2000

양악 수술에서 교합평면의 위치설정은 수술 후 새로운 위치에서의 안정성을 결정하는 중요한 요인으로써 악교정 수술환자의 진단과 치료 계획시 반드시 고려되어져야 한다. 따라서, 본 연구에서는 악교정 수술 계획시 Delaire의 구조적 구성적 방법으로 이상적인 교합평면을 설정한 경우 교합평면의 장기적인 안정성에 대해서 고찰해봄으로써 향후 악교정 수술의 진단 및 치료계획에 도움이 되고자 하였다. 본 연구에서는 골격성 제 III급 부정교합 환자 중 Delaire의 구조적 구성적 방법으로 이상적인 교합평면을 설정하여 양악수술을 시행받은 환자 25명 (남자 8명, 여자 17명, 평균 연령 $23.2{\pm}3.17$세)를 대상으로 하여, 수술후 교합평면의 안정성에 대한 평가를 시행하였다. 수술직전($T_1$)과 수술직후($T_2$, 평균 15.4일), 수술 후 최소 1년 이상 경과후($T_3$, 평균 32.6개월)을 비교함으로써 다음과 같은 결론을 얻었다. 1. 양악 수술 후 교합평면각의 유의성 있는 변화는 없었으며, 수술방법(SSRO, IVRO)에 따른 유의성 있는 변화를 보이지 않았다. 2. 술후 교합평면의 변화는 수술에 의한 악골의 이동량이나 posterior impaction의 양, 수술후 경과시간과 상관관계를 보이지 않았다. 3. 수술 후, SSRO 시행군에서는 유의하게 하악골의 전방이동이 일어났으며, IVRO 시행군에서는 하악골이 후하방 이동하면서 gonial angle과 하악평면각이 증가함으로써 하악 치아의 정출이 발생하였다.

• 대한치과보철학회지
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• 제35권1호
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• pp.15-29
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• 1997

The author performed this study to investige the relationship between condylar movements recorded with Pantronic and mandibular movements at incisal area recorded with BioEGN. For this study 24 patients with Temporomandibular disorders(TMDs) and 30 dental students without any masticatory symptoms were selected as patients group and control group, respectively. The items recorded with Pantronic(Denar Corp., USA) were immediate side-shift, orbiting path, protrusive path, and PRI. BioEGN(Bioelectric-gnathography, Bioresearch Inc., USA) were sued to measure the amount of mandibular torque movement in frontal and horizontal plane and also the distance of mandibular translation at incisal area. Amount of mandibular rotational torque movement was analyzed by angle and difference between both condyles in frontal and horizontal plane. The collected data were processed with SAS program and conclusion were as follows : 1. Mean value of items recorded with Pantronic were not significantly differed between patients group and control group except the item of pantographic reproducibility index(PRI). The value of PRI was 39.5 in patients group, and 29.5 in control group. 2. The amount of mandibular torque movement was not differed tin early protrusive and early left excursion between patients group and control group, but in early right excursion, patients group showed more value than control group did. 3. The distance on sagittal plane in early eccentric movements were longer in patients group than those in control group, but the distance of maximal eccentric movements were not significantly differed between patients group and control group. 4. Items which showed significant correlation with PRI were progressive side-shift, and horizontal torque movement in early protrusion and right excursion. 5. The angle of protrusive path of affected side was greater than of non-affected side in unilaterally affected patients, but the protrusive angle of preferred chewing side was not differed from that of contralateral side in control group. 6. The amount of torque movement in early protrusion and right excursion were greater in patients with coincidence of affected side and preferred chewing side than in patients without coincidence.

• Clinics in Shoulder and Elbow
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• 제1권2호
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• pp.221-229
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• 1998

평균 나이 23세.의 건강한 남자 31명을 대상으로 하여 측각도계즐 이용한 견관절운동역을 측정한 결과 Dominant arm과 Non-dominant arm 모두에서 능동운동역에 비해 수동운동역이 증가되었고, 능동운동시 견갑외전, 중립신전, 수평신전, 수평굴곡, 그리고 중립 및 수평내회전에서, 수동운동의 격우에는 견갑외전, 수평굴곡, 그리고 중립 및 수평내회전에서 Non-dominant arm의 운동증가를 보였고, 수평외회전의 경우 Dominant arm의 운동증가소견을 보였다(p〈0.05) .또한 방사선투시기를 이용하여 관절와상완각과 견갑흉곽각의 비(θGH/θST)를 측정해 본 결과 첫째로 Dominant arm과 Non-dominant arm에서 모두 완전거상시 관절와상완각과 견값흥곽각의 비(θGH/θST)는 1.6이었으며 60도이상 150도 거상때까지 지속적으로 견값흉곽운동 분율이 커지는 양상이었다. 둘째천 30도에서 완전거상시까지 운동분율(θGH/θST)은 Dominant arm과 Non-domlnant arm에서 각각 1.2 및 1.3으로 나타났다. 견갑사위는 중립위에서 약 42도였고 거상에 따라 점차 작아졌으며 완전거상시에는 약 20도로 측정되었다. 이렇게 해서 얻어진 방사선조사 각도는 단순방사선 촬영에 적용하여, 견관절 질환 치료 후 운동범위의 회복의 경과를 판정하는데 도움을 줄 수 있을 것으로 생각되었다.

• 대한치과보철학회지
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• 제27권2호
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• pp.143-154
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• 1989

The purpose of this study was to investigate the mandibular opening and closing movements at mandibular incisor region and clinical rest position in normal subject using the newly developed electric mandibular movement analyzing device, (M.K.G.-K6 diagnostic system, Myo-tronics Inc. Seattle, WA, U.S.A.) The 58 normal subjects, who were students of the College of Dentistry, Chonbuk National University, were selected according to sampling criteria. The obtained results were as follows: 1. There was no significant difference of distribution of opening and closing movement patterns at mandibular incisor region between male and female. There was significant difference between habitual and maximum movement patterns both in sagittal and frontal plane. 2. Although the percentage of distribution of crossover pattern was highest in all cases, but there were significant differences between patterns only at habitual opening and closing movement in sagittal plane. 3. The mean of maximum opening was $47.29{\pm}4.68mm$ in male and $42.15{\pm}4.95mm$ in female. Therefore the mean of maximum opening was larger in male than in female. 4. The mean of maximum laterotrusion in frontal trajectory was larger to the left than to the right. Also the proportion of left deviation at maximum opening position was larger than that of other cases. 5. The mean of maximum opening and closing velocity was higher in male than in female and the mean of closing velocity was higher than that of opening velocity. Also the amount of separation from the centric occlusion was higher in maximum closing velocity than in maximum opening velocity. 6. Clinical rest position was $1.70{\pm}0.99mm$ inferior, $0.74{\pm}0.57mm$ anterior, $0.99{\pm}0.51mm$ right from centric occlusion and the A/V ratio was 1:2.7.

• Archives of Plastic Surgery
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• 제44권1호
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• pp.19-25
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• 2017

Background Numerous condylar repositioning methods have been reported. However, most of them are 2-dimensional or are complex procedures that require a longer operation time and a highly trained surgeon. This study aims to introduce a new technique using a condylar repositioning plate and a centric relation splint to achieve a centric relationship. Methods We evaluated 387 patients who had undergone surgery for skeletal jaw deformities. During the operation, a centric relation splint, intermediate splint, final centric occlusion splint, and condylar repositioning plate along with an L-type mini-plate for LeFort I osteotomy or a bicortical screw for bilateral sagittal split ramus osteotomy were utilized for rigid fixation. The evaluation included: a physical examination to detect preoperative and postoperative temporomandibular joint dysfunction, 3-dimensional computed tomography and oblique transcranial temporomandibular joint radiography to measure 3-dimensional condylar head movement, and posteroanterior and lateral cephalometric radiography to measure the preoperative and postoperative movement of the bony segment and relapse rate. Results A 0.3% relapse rate was observed in the coronal plane, and a 2.8% relapse rate in the sagittal plane, which is indistinguishable from the dental relapse rate in orthodontic treatment. The condylar repositioning plate could not fully prevent movement of the condylar head, but the relapse rate was minimal, implying that the movement of the condylar head was within tolerable limits. Conclusions Our condylar repositioning method using a centric relation splint and miniplate in orthognathic surgery was found to be simple and effective for patients suffering from skeletal jaw deformities.