• 대한토목학회논문집
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• 제28권1A호
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• pp.125-133
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• 2008

사장교의 장대화로 주탑 및 보강형과 더불어 사장 케이블의 동적 안정화에 많은 노력이 요구된다. 사장 케이블에서 동적 불안정은 주로 대칭 1모드와 역대칭 1모드에서 발생되며 대칭 1모드는 역대칭 1모드와 다르게 새그의 영향이 명확하게 나타나므로 기본진동수는 팽팽한 스트링으로부터 얻은 것과 상이한 결과를 제공하게 된다. 이러한 현상에 관해 Irvine, Triantafyllou, 안상섭 등은 해석적 기법을 통해 동적거동 분석을 수행하였다. 이들의 연구는 광범위한 영역의 Irvine Parameter에 대해 중요한 결과를 제시하였으나 특성점(Cross-Over Point 혹은 복합모드 형성점) 이후 영역에 대해서는 상이한 결과를 제시하였고 진동수방정식의 높은 비선형성으로 인해 해가 매우 민감한 난점이 있다. 본 연구는 사장 케이블 동적안정 문제에 주요한 모드들 중 새그의 영향이 가장 높은 대칭 1모드의 기본진동수에 초점을 맞추었으며 일반화된 역학적에너지에 경계조건을 만족시키는 진동형상을 적용하고 Rayleigh-Ritz 방법으로 해석적인 해를 제시하였다. 선행연구들과 다르게 본 연구는 선형적인 해를 제공하며 이에 따른 오차는 특성점 이내에서 3% 미만의 오차를 보였다. 또한, 사장 케이블이나 이에 준한 케이블은 특성점을 넘지 않으므로 공학적으로 충분한 가치를 갖는다고 볼 수 있다. 더불어 대칭 1모드에서 발생되는 갤로핑과 Parametric 공진대역을 분석하여 연구의 활용성을 확인하였다.

• 호남수학학술지
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• 제26권4호
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• pp.549-557
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• 2004

In this paper, we prove the product property and the existence of an extremal analytic disc relative to the higher order Kobayashi metric. Also by making use of the upper semicontinuity of the higher order Kobayashi metric, we introduce a pseudodistance and investigate some properties of that pseudodistance related to the usual Kobayashi metric.

• 대한수학회지
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• 제59권4호
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• pp.699-715
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• 2022

We describe a construction which takes as an input a left order of the fundamental group of a manifold, and outputs a (singular) foliation of this manifold which is analogous to a taut foliation. We investigate this construction in detail in dimension 2, and exhibit connections to various problems in dimension 3.

• The Journal of Korean Physical Therapy
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• 제22권3호
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• pp.17-21
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• 2010

Purpose: This study was designed to investigate possibilities for quantitative analysis using the electromyography and sonography. For better understanding, we evaluated the correlation between the pressure pain threshold and sonography, spontaneous electrical activity in trigger points located in the upper trapezius muscle. Methods: Thirty three active subjects volunteered to participate in this study (n=33). They had a palpable taut band, exquisite spot tenderness of a nodule in a taut band, spontaneous pain, referred pain, jump sign, local twitch response, and a painful limit to full stretch range of motion. We measured Pressure pain threshold, density, white area index, root mean square, and reaction. Pearson’s correlation coefficient was calculated to estimate the relationship between the pressure pain threshold and other variables including density, white area index, root mean square, and reaction time. Results: There were significant correlations between pressure pain threshold and density (r=-0.75, p<0.01), and between pressure pain threshold and white area index (r=-0.74, p<0.01). A significant correlations between pressure pain threshold and root mean square (r=-0.59, p<0.01). The significant correlation was found between pressure pain threshold and reaction time (r=-0.64, p<0.01). Conclusion: These should indicate whether quantitative analysis can be done using the characteristics of electromyography and sonography.

• 한국한의학연구원논문집
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• 제2권1호
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• pp.26-39
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• 1996

The literatual study on the therapy for clearing away heat with apoplexy therapy, the result were obstained as follows. 1. In apoplexy therapy, therapy for clearing away heat is used excessive heart - fire by overacting of the five emotions, liver fire, deficiency of kidney - fluid, wind - heat. 2. The fire of aetiology of apoplexy is used therapy for clearing away eat, in aspect of viscera and bowels, divied into heart - fire, liver - fire, deficiency fie of kidney yin, wetness - phlegm of spleen heat. The treatment is clear away heart - fire, clear away liver - fire, clear away spleen - heat and sthenic water. 3. Symptom of excessiveness symptom - complex is used therapy for clearing away heat that are fever, flushed face, halitosis, heart burn, easy anger, apoplestic stroke, unconsciouness, trismus, paralysis, constipation, red tongue with yellow coat, taut - smooth pulse or full - rapid pulse and symptom of insufficiency symptom - complex that are dizziness, tinitus, blurring of vision, deficiency sleeping, dreaminess, lassitude of the loins and legs, hemiplegia, red tongue with white coat or thin - yellow coat taut - thready - rapid pulse. 4. Therapy for norish vital essence - clearing away heat is availed in excessive fire caused by deficiency of yin of the liver and kidney, therapy for break through phlegm - clearing away heat in stagnant heat therapy for waking up a patient from unconsciousness - clearing away heat in yang type sthenia - syndrom of coma of apoplexy involving viscera and bowels. 5. Commonly used recipes of therapy for clearing away heat are Yang gyolksan(凉膈散), Bang pongtongseongsan(防風通聖散), Sotongseongsan(小通聖散), Jibodan(至寶丹), Supungsungisan(搜風順氣散), Woowhangchengshimwhan(牛黃淸心丸), Chengungsekgong(川芎石膏湯), Samwhatang(三化湯) etc in excessiveness symptom- complex, and are Yukmijiwhangweon(六味地黃元), Jiwhangtang(地黃湯), Palmiji whangtang(八味地黃湯), Samultanggagam(四物湯加減) etc in insufficiency symptom - complex.

• Smart Structures and Systems
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• 제24권1호
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• pp.83-94
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• 2019

Passive negative stiffness dampers (NSDs) that possess superior energy dissipation abilities, have been proved to be more efficient than commonly adopted passive viscous dampers in controlling stay cable vibrations. Recently, inertial mass dampers (IMDs) have attracted extensive attentions since their properties are similar to NSDs. It has been theoretically predicted that superior supplemental damping can be generated for a taut cable with an IMD. This paper aims to theoretically investigate the impact of the cable sag on the efficiency of an IMD in controlling stay cable vibrations, and experimentally validate superior vibration mitigation performance of the IMD. Both the numerical and asymptotic solutions were obtained for an inclined sag cable with an IMD installed close to the cable end. Based on the asymptotic solution, the cable attainable maximum modal damping ratio and the corresponding optimal damping coefficient of the IMD were derived for a given inertial mass. An electromagnetic IMD (EIMD) with adjustable inertial mass was developed to investigate the effects of inertial mass and cable sag on the vibration mitigation performance of two model cables with different sags through series of first modal free vibration tests. The results show that the sag generally reduces the attainable first modal damping ratio of the cable with a passive viscous damper, while tends to increase the cable maximum attainable modal damping ratio provided by the IMD. The cable sag also decreases the optimum damping coefficient of the IMD when the inertial mass is less than its optimal value. The theoretically predicted first modal damping ratio of the cable with an IMD, taking into account the sag generally, agrees well with that identified from experimental results, while it will be significantly overestimated with a taut-cable model, especially for the cable with large sag.

• 한국해양공학회지
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• 제22권5호
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• pp.69-74
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• 2008

This study performed a numerical simulation to predict the development of ship waves and their propagation in the shallow water region of Gunzang New Port and to examine the stability of taut line mooring at the sea wall using the design criteria. In order to predict the propagation of ship waves based on the speeds of various ships under complicated and shallow water depths, a computer model was constructed based on the Boussinesque equation with a fixed coordinate system. Additionally, an investigation if the stability was made by applying MOSES under the environmental loadings estimated by OCIMF.

• 한국염색가공학회지
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• 제6권4호
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• pp.34-39
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• 1994

For the purpose of obtaining high modulus PET tire cord fiber by high spinning speed, the change of initial modulus and taut tie molecules (T.T.M) fraction with the PET tire cord fibers by different spinning speed is investigated. Initial modulus decreased with increasing spinning speed but increased above spinning speed of 1500m/min. Therefore, high modulus PET tire cord fiber may be obtained above spinning speed of 3500m/min. It was found that the initial modulus of fibers depends on fraction of T.T.M.

• 한국실내디자인학회논문집
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• 제19호
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• pp.11-19
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• 1999

This study is about the Characteristics of the Medievalism expressed in the German Architectural Expressionism. The concept of Medievalism is an attitude to revive the social and physical settings on Middle Ages. The social situation and architectural style in the Middle Ages were similar to the German Expressionism in the early 20th-century. The Medieval Characteristics of the German Architectural Expressionism were expressed in two ways -first, organic or sculptural style and second, fantastic or Crystal style. The architects such as Hermann Finsterlin, Henry van de Velde, Erich Mendelsohn, Rudolf Steiner, Hugo H ring, Hans Poelzig belonged to the first tendency, and such as Paul Scheerbart, Bruno Taut, Otto Bartning, Dominikus B hm belonged to the second tendency. The Medieval concept of the German architectural Expressionism was succeeded to Modern Architecture in 1950-1960s'. The architects in 1950-1960's such as Hans Scharoun, Gottfried B hm, Alvar Aalto, J rn Utzon intended to express organic and fantastic mass which was closely connected with the Medival concept of the German architectural Expressionism.

• 대한한의학원전학회지
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• 제23권1호
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• pp.101-114
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• 2010

In the perspective of the correspondence of heaven and man[天人相應], people live through Gi of heaven and earth[天地之氣], and the human body which is a small universe[小宇宙] itself receives influence while sympathizing with the Gi and heaven[天氣]. So with unexpected incident of the Eum and Yang, four season[陰陽四時], ups and downs of warmth of cold and chilliness of warm[寒熱溫涼] differs, and the position of Gi of human[人氣] changes, regimen and application of acupuncture, and images[象] of the pulse changes. In "Maekyojeongmiron(脈要精微論)", ups and downs of Eum and Yang changes by four season[四時], and correspondence of ups and downs of pulse law is explained with compass, carpenter's square, the beam of balance and the weight of balance[規矩權衡]. Compass[規] is a measure of instrument that can draw a circle, like regulating the measure and differing the center of the circle and diameter and drawing a circle, compass is a image of Gi of Yang[陽氣] that was staying deep inside the body in winter stretching out by big fault[太過不及] of year and energy[元氣] of human in spring. Carpenter's square[矩] is a instrument that draws direction, which is a image of Gi of Yang flourishing in summer and when it gets highly flourished, again the Gi of Eum[陰氣] comes alive and falls. The beam of balance[衡] is a scale, like a scale that tilts at once when one side is slightly heavy, the beam of balance is a image Gi of yang that is fully flourished in summer and about to descent again, which is just about to fall but not going down yet. The weight of balance [權] is a image of gi of yang which as descent to the bottom and staying in the deepest place. compass, carpenter's square, the beam of balance and the weight of balance is not a direct pulse image[脈象], but standard image of pulse of pulse corresponding to the Gi of human[人氣] that changes by four season, and the explanation includes the pulse image of four season like the taut, full, floating, deeply gather[弦鉤浮營] of "Okgijinjangron(玉機眞藏論)" or taut, full, skip, float, deep [弦鉤代毛石] of "Pyeong-ingisangron(平人氣象論)". So with compass, carpenter's square, the beam of balance and the weight of balance, can judge is human correspond in Eum and Yang, four seasons, this is importantly used in examination of pulse[診脈] with existence and nonexistence, and prognosis of illness.