• 한국운동역학회지
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• 제13권3호
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• pp.15-26
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• 2003

This study was conducted to investigate the performance times, CM position and CM speed, pole chord length and pole chord angle, whole body angular momentum(X axis), and grip width in pole vault event according to the event and phase; touch down, pole plant, take-off, maximum pole bending pole straight, pole release, peak height, and foot contact, pole contact, free flight. The pole vaulting of four male elite vaulters including six trial were filmed using two video digital cameras at 60 Hz at 56th national athletic match, and data were collected through the DLT method of three dimensional cinematography. In general the better jumper is, the longer the performance time is. And the greater CM speed is, and the better his transformation ability of CM horizontal speed into vertical speed is. As he uses a longer pole, his grip is higher, and it is a enough for him to rock back his body, so that he pulls and pushes the pole well keeping his hips close to. An greater maximum angular momentum and early positioning of the hips parallel to the bar makes his body far side of the bar and his bar clearance easier. Specially our national jumper needs to have more powerful braking force during foot contact phase, and take his body on the pole after maximum pole bending, and pull and push the pole strongly keeping his hips close to. Also he needs to have stronger muscular strength in order to control the longer pole and use the pole of proper tension more efficiently.

• 조명전기설비학회논문지
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• 제23권8호
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• pp.74-79
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• 2009

전력공급에 중요한 설비가 집중되어 있는 건축물 내의 수변전설비가 내진시설이 고려되지 않은 경우 지진 발생시 전력 시설물 낙하, 이동 등으로 인한 설비 피해 및 전기화재 등 제2의 피해가 발생을 할 수 있다. 하지만 수변전실 내진설계의 필요성에도 불구하고 국내에서는 아직 적용하고 있지 않다. 따라서 건축물 내에 수변전실의 전기설비 내진설계에 관하여 국내 건축구조설계 기준과 일본의 건축전기설비 내진 설계 시공 매뉴얼을 참조하여 건축물 내에 시설되는 수변전설비의 내진 설계 방법 및 내진 설계 예를 제시하였다.

• Archives of Plastic Surgery
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• 제38권3호
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• pp.222-227
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• 2011

Purpose: Autogenous particulate bone grafting is a type of autogenous bone graft that consists of small particles of cortical and cancellous bone. Autogenous particulate bone grafting has been used for calvarial bone defect after calvarial defect of craniosynostosis and prevention of temporal depression after fronto-orbital advancement. The results were followed up and studied for effectiveness of autogenous calvarial particulate bone grafting. Methods: Cranial vault remodeling and fronto-orbital advancement was performed for six craniosynostosis patient from August 2005 to October 2007. Autogenous particulate bone grafting was harvested from endocortex of separated cranial vault and if insufficient, from extocortex of occipital region using Hudson brace & D'Errico craniotomy bit and was grafted on the calvarial bone defect of cranial vault and temporal hollow. Fibrin glues were added to the harvested particulated bone for adherence and shaping of paticles. Results: Autogenous particulate bone grafting was followed-up at least longer than I year. The calvarial bony defects following primary cranial remodeling were successfully covered and postoperative temporal depressions after fronto-orbital advancement were also well prevented by grafted particulated bone. Conclusion: Autogenous calvarial particulate bone graft can be harvested in infants and young children with minimal donor site morbidity. It effectively heals cranial defects in children and during fronto-orbital advancement reduces the prevalence of osseous defects independent of patient age. It's easy and effective method of reconstruction of calvarial defect.

• 한국지능시스템학회논문지
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• 제23권4호
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• pp.310-316
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• 2013

바이오인식 시스템은 변하지 않는 고유의 특성으로 인하여 범죄를 포함한 다양한 분야에서 널리 사용되고 있다. 그러나 바이오인식정보가 불법 사용자에게 누설되었을 때 많은 문제점을 지니고 있다. 본 논문에서는 지문과 얼굴 정보를 보호하기 위하여 실수형 오류정보 부호 코드화를 수행하는 실수형 퍼지 볼트를 이용한 다중 바이오 인식 시스템을 개발한다. 제안된 방법은 실수형 퍼지볼트를 이용함으로써 분실시 재생성할 수 없는 지문 및 얼굴 특징값과 달리 개인 킷값을 수시로 변경할 수 있다는 장점과 두 가지 바이오정보를 융합함으로써 보안이 강화된 바이오인식 시스템을 구현할 수 있다는 장점이 있다. 제안된 방법의 타당성을 검증하기 위하여 실험한 결과 기존 방법에 비하여 우수한 결과를 나타냈다.

• 대한두개안면성형외과학회지
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• 제15권3호
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• pp.109-116
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• 2014

Background: Infants with deformational plagiocephaly (DP) usually present with cranial vault deformities as well as facial asymmetry. The purpose of this study was to use three-dimensional anthropometric data to evaluate the influence of cranial deformities on facial asymmetry. Methods: We analyzed three-dimensional computed tomography data for infants with DP (n=48) and without DP (n=30, control). Using 16 landmarks and 3 reference planes, 22 distance parameters and 2 angular parameters were compared. This cephalometric assessment focused on asymmetry of the orbits, nose, ears, maxilla, and mandible. We then assessed the correlation between 23 of the measurements and cranial vault asymmetry (CVA) for statistical significance using relative differences and correlation analysis. Results: With the exception of few orbital asymmetry variables, most measurements indicated that the facial asymmetry was greater in infants with DP. Mandibular and nasal asymmetry was correlated highly with severity of CVA. Shortening of the ipsilateral mandibular body was particularly significant. There was no significant deformity in the maxilla or ear. Conclusion: This study demonstrated that the cranial vault deformity in DP is associated with facial asymmetry. Compared with the control group, the infants with DP were found to have prominent asymmetry of the nose and mandible.

• Steel and Composite Structures
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• 제14권6호
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• pp.571-586
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• 2013

This paper focuses on the buckling capacity of a hybrid grid shell. The eigenvalue buckling, geometrical non-linear elastic buckling and elasto-plastic buckling analyses of the hybrid structure were carried out. Then the influences of the shape and scale of imperfections on the elasto-plastic buckling loads were discussed. Also, the effects of different structural parameters, such as the rise-to-span ratio, beam section, area and pre-stress of cables and boundary conditions, on the failure load were investigated. Based on the comparison between elastic and elasto-plastic buckling loads, the effect of material non-linearity on the stability of the hybrid barrel vault is found significant. Furthermore, the stability of a hybrid barrel vault is sensitive to the anti-symmetrical distribution of loads. It is also shown that the structures are highly imperfection sensitive which can greatly reduce their failure loads. The results also show that the support conditions pose significant effect on the elasto-plastic buckling load of a perfect hybrid structure.

• 한국압력기기공학회 논문집
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• 제17권2호
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• pp.90-100
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• 2021

Molten corium-concrete interaction (MCCI) is one of the most important phenomena that can lead to the potential hazard of late containment failure due to basemat penetration during a severe accident. In this study, MCCI analytical models of the CORQUENCH code were prepared through verification calculations of several experiments, which had been performed using concrete types similar to those of the calandria vault floor in CANDU-6 plants. The behaviors of thermal-hydraulic variables related to MCCI phenomena were analyzed under the conditions of dry floor and water flooding during the severe accident stemming from a hypothetic station blackout. Uncertainty analyses on the ablation depth were also carried out. It was estimated that the concrete ablation was not interrupted due to the continuous MCCI process under the dry condition but was terminated within 24 hours under the water flooding condition. It was confirmed that the water flooding as a mitigating action was effective to achieve the quenching and thermal stabilization of the melt discharged from the calandria vessel, showing that the present models are capable of reasonably simulating MCCI phenomena in CANDU-6 plants. This study is expected to provide the technical bases to the accident management strategy during the late-phase severe accidents.

• 콘크리트학회논문집
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• 제20권5호
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• pp.565-572
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• 2008

세계 경제가 글로벌화되고 발달하며 금융권에 대한 재화의 보관이 크게 늘어나고 있는 추세에 있으며 이에 따라 악의적인 침입에 대해 충분히 저항할 수 있는 금고비의 필요성이 부각되고 있다. 본 연구에서는 국내에서 경제성 있고 수급이 용이한 재료들을 이용하여 금고비 내부의 충전부로 적용될 콘크리트를 개발하고자 하였다. 이 목표를 위해 170 MPa 이상의 압축강도를 갖도록 배합을 결정한 후 UL 608 금고비 성능 인증 기준에 따라 중압절단기를 이용하여 $3,000^{\circ}C$ 내외의 온도를 갖는 화염에 저항하고 해머드릴 및 해머를 이용한 충격에 저항할 수 있도록 보강을 계획하였다. 화염에 대한 저항을 위해 여러 유기섬유를 혼입하였으며 강섬유 및 보강 구조물을 적용하여 충격하중에 대한 저항성을 얻고자 하였다. 본 연구로부터 얻은 결과들은 테러 등으로부터 안전성을 확보해야할 중요 시설물 및 방호구조물, 원자력발전소 등에 응용하여 적용할 수 있을 것으로 판단된다.

• 한국운동역학회지
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• 제15권4호
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• pp.1-11
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• 2005

The study were to assess technical factors between the high score group and the low score group, from the subjects of 8 male national gymnasts, and to analyze the kinematical characteristic and main technical cause on technique of Kasamatsu movement on Vault. The result of this study is this. In case of horse contact time the high score group was swifter than low score group, and there was significant difference between the high score group and the low score group(<.01). On high score group the time of taking on from horse showed shorter than that of taking off from horse, while of the low score group the time of taking on the horse was similar to that of taking off from horse on the average. And in time of pre-flight the high score group on average the was 0.16sec shorter times than the low score group, and so there was significantly difference between groups(<.05). Also It is a characteristic that the high score group was short in horse contact time and longer in post-flight. In the horizontal distance of post-flight, the high score group was 0.11m longer than the low score group and there was significantly statistic difference between groups(<.05). In the vertical height of the cog in Post-flight's phrase, the high score group was 0.15m higher than the low score group and there was significantly statistic difference between groups(.<01). The horizontal velocity and vertical velocity in the event of taking on and off Beat board and Vault weren't significantly statistic differences between two groups. In the slow-down of average horizontal velocity during keeping contact with the beat board, the high score group was larger than the low score group. And in an increased average vertical velocity during keeping contact with the beat board, the high score group was even larger than the low score group. In the projectile angle of cog in taking off the beat board, 40.2deg., the angle of low score group and 39.5deg., the angle of high score group are nearly alike. In the projectile angle of cog in taking off the beat, the high score group showed 1.6Wt larger on average than the low score group. However the average reaction force on the board and Vault wasn't almost different between two groups, showed 0.3~0.6Wt larger in the high score group.

• 한국운동역학회지
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• 제17권2호
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• pp.93-101
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• 2007

The purpose of this study was to analyze the research trends of artistic gymnastics on the kinetics. This study analyzed the 76 published papers in the Journal of Korean Alliance for Health, Physical Education, Recreation & Dance and Korean Journal of Sport Biomechanics between 1995 and 2006. Papers were split into two groups for analysis, 1995-1999 and 2000-2006, and classified according to research methods, areas, and main topics. Conclusions are as follow. First, method of research were kinematical research(80.3%), kinetic(17.1%), and EMG research(2.6%). Second, areas of research were hi-bar(31.6%), vault(23.7%), parallel bars(21.1%), floor exercise(13.2%), rings(3.9%), balance beam(3.9%), uneven bars(2.6%). Last, main topic of research were focused on vault Tsukahara skill(13.9%), hi-bar flight skill(11.4%), parallel bars support skill(10.1%), hi-bar dismount skill(8.9%), floor exercise salto skill(8.9%).