• 디지털융복합연구
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• 제13권11호
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• pp.349-355
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• 2015

아티스트에게 음악적 정체성을 가지고 있는가의 여부는 상당히 중요하다. 현재 국내의 대형기획사는 치밀한 기획력과 자본을 바탕으로 음악적 정체성이 없는 아이돌이라는 문화 상품을 만들어내고 있다. 이러한 상황 속에서 자신의 사상과 정체성을 명확하게 드러냈던 아티스트 프린스를 주목해야 할 필요가 있다. 그의 음악적인 천재성과 독특함에 대한 많은 연구는 음악의 본질에 대해 다시금 생각하게 하는 자극제가 될 것이다. 편곡자로의 프린스는 텐션 노트를 효과적으로 활용하고 어보이드 노트마저도 음악적인 색깔로 표현할 수 있다는 것을 보여주었다. 그가 가지고 있는 음악적인 천재성과 독특함에 대한 더욱 많은 연구가 앞으로도 계속 이루어져야 하며, 이러한 연구는 음악공부를 하는 사람들을 비롯하여 대중에게도 음악의 본질에 대해 다시금 생각하게 하는 자극제가 될 것이다. 음악에는 정답이 없고, 그 본질에는 예술이라는 근본이 있어야 한다.

• International Journal of Concrete Structures and Materials
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• 제10권2호
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• pp.143-147
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• 2016

In recent years, some modifications were introduced in the stress-strain relationship of the steel in order to develop a more efficient shear model for reinforced concrete members. The last contribution in this sense corresponding to the Refined Compression Field Theory (RCFT, 2009); this theory proposed a steel constitutive model that has account the tension stiffening area prescribed by technical codes, what simplifies all the design process. However, under certain design conditions supported by such codes, the RCFT model does not provide a real (non-complex) solution for the steel yield strain when the prescribed tension stiffening area is considered; then the load-strain response cannot be computed. In this technical note, the tension stiffening area is fixed in order to guarantee the application of the embedded steel constitutive model for all the standard design range.

• 대한기계학회논문집A
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• 제25권11호
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• pp.1777-1784
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• 2001

This paper provides d simplified engineering J estimation method fur semi-e1liptical surface cracked plates in tension, based on the reference stress approach. Note that the essential element of the reference stress approach is the plastic limit lead in the definition of the reference stress. However, for surface cracks, the definition of the limit load is ambiguous ("local" or "global"limit lead), and thus the most relevant limit load (and thus reference stress) for the J estimation should be determined. In the present work, such limit load solution is found by comparing reference stress bated J results with those from extensive 3-D finite element analyses. Validation of the proposed equation against FF J results based on tactual experimental tensile data of a 304 stainless steel shows excellent agreements not only far the J values at the deepest point but also for those at an arbitrary paint along the crack front, including at the surface point. Thus the present results provide a good engineering tool for elastic-plastic fracture analyses of surface cracked plates in tension.

• Advances in Computational Design
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• 제3권2호
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• pp.147-163
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• 2018

Cementitious composites are multiphase heterogeneous materials with distinct dissimilarity in strength under compression and tension (high under compression and very low under tension). At macro scale, the phenomenon can be well-explained as the material contains physical heterogeneity and pores. But, it is interesting to note that this dissimilarity initiates at molecular level where there is no heterogeneity. In this regard, molecular dynamics based computational investigations are carried out on cement clinkers and calcium silicate hydrate (C-S-H) under tension and compression to trace out the origin of dissimilarity. In the study, effect of strain rate, size of computational volume and presence of un-structured atoms on the obtained response is also investigated. It is identified that certain type of molecular interactions and the molecular structural parameters are responsible for causing the dissimilarity in behavior. Hence, the judiciously modified or tailored molecular structure would not only be able to reduce the extent of dissimilarity, it would also be capable of incorporating the desired properties in heterogeneous composites. The findings of this study would facilitate to take step to scientifically alter the structure of cementitious composites to attain the desired mechanical properties.

• 한국구조물진단유지관리공학회 논문집
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• 제22권2호
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• pp.1-7
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• 2018

현수교 주 케이블은 케이블 밴드의 볼트 축력에 대한 정기적인 유지 관리가 매우 중요하다. 현수교 케이블 밴드의 볼트 축력은 시간이 경과함에 따라 케이블 소선의 크리프 현상, 볼트의 릴렉세이션, 하중 변동, 케이블 소선의 재배열 등으로 인해 축력 감소 현상이 발생하게 된다. 본 연구에서는 국내 현수 교량(SR대교)의 케이블 밴드가 시간이 경과하면서 발생하는 축력 감소 현상에 대해 그 원인 및 감소량 등에 대한 현장 측정 및 이론적 검토, 안전율 검토, 장기적인 이력 관리 등을 수행하였다. 그 결과, 케이블 밴드 볼트 축력 감소는 주 케이블 소선에 사용된 아연 도금층의 소성 변형에 크게 영향받는 것을 확인하였으며, 이에 대한 이론적 체계 및 장기 이력 관리에 대한 적용성을 확립하였다.

• Clinics in Shoulder and Elbow
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• 제25권4호
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• pp.328-333
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• 2022

Irreparable rotator cuffs with retracted torn ends remain a significant challenge for most shoulder surgeons. Since repairs are preferable to reconstruction or replacement whenever possible, studies for anatomical reductions with minimal tension and secure fixation are important. In this study, the authors introduce an arthroscopic supraspinatus advancement (ASSA) procedure for retracted rotator cuff tears that could not be adequately reduced to the original footprint. Using modified long, narrow, curved Cobb elevators, procedures can be performed through lateral portals without any additional skin incision. Following meticulous stepwise three-compartment elevation procedures based on the supraspinatus insertion anatomy, the supraspinatus muscle could be safely elevated from the fossa and sufficiently advanced laterally. The authors suggest that ASSA could be a useful procedure for management of challenging retracted rotator cuff tears by maximizing lateral excursions that could convert irreparable tears to reparable tears in select patients.

• 대한정형도수물리치료학회지
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• 제9권2호
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• pp.5-11
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• 2003

Thoracic outlet syndrome is actually a collection of syndromes brought about by abnormal compression of the neurovascular bundle by bony, ligamentous or muscular obstacles between the cervical spine and the lower border of the axilla. First of all a syndrome is defined as a group of signs and symptoms that collectively characterize or indicate a particular disease or abnormal condition. The neurovascular bundle which can suffer compression consists of the brachial plexus plus the C8 and T1 nerve roots and the subclavian artery and vein. The brachial plexus is the network of motor and sensory nerves which innervate the arm, the hand, and the region of the shoulder girdle. The vascular component of the bundle, the subclavian artery and vein transport blood to and from the arm. the hand. the shoulder girdle and the regions of the neck and head. The bony, ligamentous, and muscular obstacles all define the cervicoaxillary canal or the thoracic outlet and its course from the base of the neck to the axilla or arm pit. Look at the scheme of this region and it all becomes more easily understood. Compression occurs when the size and shape of the thoracic outlet is altered. The outlet can be altered by exercise, trauma, pregnancy, a congenital anomaly, an exostosis, postural weakness or changes. Thoracic outlet syndrome has been described as occurring in a diverse population. It is most often the result of poor or strenuous posture but can also result from trauma or constant muscle tension in the shoulder girdle. The first step to beginning any treatment begins with a trip to the doctor. Make a list of all of the symptoms which seem to be present even if the sensations are vague. Make a note of what activities and positions produce or alleviate the symptoms and the time of day when symptoms are worst. Also, note when the symptoms first appeared. This list is important and should also include any questions one may have.

• Applied Biological Chemistry
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• 제50권1호
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• pp.12-17
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• 2007

태백산 토양에서 유화활성과 안정도가 높은 biosurfactant 생산균주 TBM 3101을 분리하여 동정한 결과 B. subtilis로 판명되었다. B. subtilis TBM 3101의 배양액에서 표면장력은 최저 29mN/m까지 감소되었고, 이후 장시간 계속 유지되었다. 또한, tributyrin을 기질로 사용하였을 때 2.68로 가장 큰 유화력을 보였고, 그 외에 soybean oil, crude oil, tetradecane 에서도 비슷한 활성을 보였다. 각종 다른 합성계면활성제의 유화활성 및 안정성을 고려하여 비교 분석한 결과 B. subtilis TBM 3101 생산하는 biosurfactant는 tween류와 span 85와 유사한 유화활성을 나타내었고, tween 80과 triton X-100과 비슷한 유화 안정도를 보여주었다.

• 대한조선학회논문집
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• 제53권5호
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• pp.435-446
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• 2016

In this study, hydrodynamic and mooring analysis for LNG FSRU moored by an internal turret with 9 mooring lines are numerically performed using commercial softwares, Hydrostar and Ariane. Met-ocean combinations for screening method are taken from wave governed condition(BV Rule Note NR 493) with relative heading between wave and wind between −45° and +45° and relative heading between wind and current between −30° and +30°. Extreme mooring analysis and sensitivity analysis are performed for intact and damaged (=one line missing) conditions and the parameters for sensitivity analysis are wave peak period, peak enhancement factor and line pretension. In the viewpoint of the design tension in mooring line, chain diameter is designed to satisfy safety factor for each conditions. As the chain diameter is increased from 152mm to 171mm, the designtension is reduced while the minimum breaking load is increased.

• 소성∙가공
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• 제12권5호
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• pp.493-497
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• 2003

The present investigation aims at visualizing the crack tip stress field using a mechanoluminescence material. The well known compound $SrAl_2O_4$:$Eu^{2+}$ was adopted as a mechanolurninescence material. Two more trivalent rare-earth elements such as Dy and Nd were taken into consideration as codopants to provide the appropriate trap levels. Samples of a variety of compositions were prepared by varing $Eu^{2+}$, $Dy^{3+}$, and $Nd^{3+}$ doping contents, for which the combinatorial chemistry method was used. In order to search for the optimum composition for the highest mechanoluminescence, the luminescence induced by a compressive device including a CCD camera. In parallel, a compact tension specimen was prepared by mixing the luminescence powders of optimum composition and epoxy resin. Crack initiation from the mechanically machined sharp note tip and its growth during loading were found to be associated with the extent of light emission from $SrAl_2O_4$.