• 수산해양기술연구
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• 제54권1호
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• pp.25-31
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• 2018

In this study, the differences of holding power according to the shape and weight distribution of concrete weight used in shellfish shell fishery were investigated through the experiments. To investigate the differences in shape, five bar-shaped concrete weights with the same length and different cross-sectional shapes were produced. The sectional shape of each weight was square, triangle, circle, small cross, and large cross (SQ, TR, CI, CR-S, CR-L). Ten rectangular parallelepiped weights with different bottom area and cross-sectional area were produced. To investigate the differences by the weight distribution, the holding power on the square model (SQ) with six 50 g weights at different positions was investigated. All the holding power was obtained by measuring the tensile force generated when the concrete weight was pulled at a constant speed on the sand. As a result, there were no differences in holding power between the ten rectangular weights. However, the experiment on weights with different cross-sectional shapes showed differences in holding power. The holding power was higher in the order of CR-L > CR-S > CI > TR > SQ. In the weight distribution test, the holding power was higher as the front side of the weight was heavier. Generally, the frictional force is the same even if the shape is different, when two objects have the same value in the weight and the roughness. On the other hand, it seems to have a large impact when the shape of the bottom is deformed in the course of pulling the object. Particularly, the larger the degree of protrusion like cruciform weights, the more the holding power increased while deeply digging the bottom. It is also likely that the holding power increases as the front weight increases.

• 동서간호학연구지
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• 제4권1호
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• pp.7-20
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• 1999

Operation usually brings about psychological stress as well as physical stress to the patient and it greatly influences the maintenance of the homeostasis. Until now, most of the nursing research concerning the anxiety of the patient undergoing an operation has been done while the patient was under general anesthesia. Under local anesthesia, the anxiety of the patient who undergone operation is short. However, there is much demand of the operational nurses to mediate between the patient who is undergoing operation when fully conscious, as they are aware of the patient's anxiety and to decrease the patient's anxiety of this local anesthesia. Therefore, this research tries to verify the effects of the Hand-holding program on the anxiety of the operational patient undergoing local anesthesia and affirms the role of the nursing intervention. As an unequivalent control group non-synchronized designs, this research selects out 20 control groups and 21 experimental groups at random who have received cataract operation while under local anesthesia and after implementing the Hand-holding program to the experimental groups while undergoing the operation, the effect of the experiment was observed. By observing the Epinephrine, Cortisol, blood pressure, and pulse for the physical indexes before and after the enforcement of the hand-holding, and using the measurement of Speilberger(1972) for the psychological indicators for the anxiety of the patient before and after hand-holding, the results were analyzed through SAS program. As a results, intervention of hand-holding had a remarkable effect to decrease the anxiety felt by the patient and the diastolic blood pressure also was effectively decreased. On the other hand, through the decrease of the systolic blood pressure was also observed, it was not statistically significant. In the Epinephrine and Cortisol indicators, the intervention of hand-holding was revealed to have an insignificant effect. The Hand-holding was revealed to have an indicators, the intervention of Hand-holding was revealed to have an insignificant effect. The Hand-holding program may be said to have an effect which decreases the psychological anxiety of the patient undergoing local anesthesia.

• 기술혁신학회지
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• 제16권1호
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• pp.367-389
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• 2013

2008년부터 대학의 기술사업화 촉진을 위해 산학협력기술지주회사를 설립 운영하고 있다. 그동안 산학협력기술지수회사의 운영에 대한 필요성과 활성화 방안, 법적 제도적 요건 검토, 사례연구 등이 다양하게 수행되었다. 하지만 정책 수요자인 국가연구개발사업에 참여한 대학의 연구자들을 대상으로 산학협력기술지주회사의 전반적인 운영현황에 대한 종합적인 실태조사가 미흡하였다. 특히 현 시점은 산학협력기술지주회사 제도가 도입된 지 5년이 경과하여 이에 대한 정책적 점검이 요구되고 있다. 이에 본 연구에서는 산학협력기술지주회사의 전반적인 운영현황에 대한 설문조사와 면접조사를 실시하였다. 이 실증분석 결과에 근거해서 (1)대학의 기술사업화 기반 확충과 (2)법적 제도적 지원제도 개선, (3)조직의 우수인력 확충과 책임성 확보의 세 가지 측면에서 산학협력기술지수회사의 개선방안을 제시하였다.

• 한국콘텐츠학회논문지
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• 제15권10호
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• pp.597-606
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• 2015

창업에 있어 중요한 요소 중 하나가 기술이다. 기술을 가진 연구자가 창업을 주도하였고 기술을 기반으로 창업하는 형태중의 하나가 연구소 기업이다. 또한 연구원 창업과 연구소 기업을 지원하기 위해 기술지주회사가 설립되었다. 한국에 연구소 기업이 도입된 시기는 2005년이며, 법률에 따라 대학에 기술지주회사가 설립된 시기는 2006년부터 시작되었다, 대학의 기술지주회사는 2014년 기준으로 39개가 설립되어 운영 중이지만 연구소의 기술지주회사는 에트리홀딩스가 유일하다. 에트리홀딩스는 연구소 기술의 사업화를 촉진하기 위해 2010년 전자통신연구원(ETRI)에 의해 설립된 창업투자회사이다. 본 연구에서는 연구소 기술지주회사인 에트리홀딩스의 최근 5년간의 재무제표 분석을 통해 에트리홀딩스와 자회사인 연구소 기업의 현황을 분석하였다. 분석한 결과에 따르면, 기술지주회사로서 연구소 기업에 투자를 하는 지주회사의 역할을 수행하고 있으나, 재무적 성과는 아직 나타나지 않고 있고 있어 아직 선순환모델이 정착되었다고 볼 수는 없다. 아울러 본 연구에서는 재무분석에 근거하여 에트리홀딩스 운영의 개선안을 제시하였다.

• Geomechanics and Engineering
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• 제28권2호
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• pp.197-207
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• 2022

The seismic holding behaviors of plate anchor embedded into submerged coarse-grained soils were investigated considering different anchor inclinations. The limit equilibrium method and the Pseudo-Dynamic Approach (PDA) were employed to calculate the inertia force of the soils within the failure rupture. In addition, assuming the permeability of coarse-grained soils was sufficiently large, the coefficient of hydrodynamic force applied on the inclined plate anchor is obtained through adopting the exact potential flow theory. Therefore, the seismic holding resistance was calculated as the combination of the inertia force and the hydrodynamic force within the failure rupture. The failure rupture can be developed due to the uplift loads, which was assumed to be an arc of a circle perpendicular to the anchor and inclines at (π/4 - φ/2). Then, the derived analytical solutions were evaluated by comparing the static breakout factor N_γ to the published experimental and analytical results. The influences of soil and wave properties on the plate anchor holding behavior are reported. Finally, the dynamic anchor holding coefficients N_γd, were reported to illustrate the anchor holding behaviors. Results show that the soil accelerations in x and z directions were both nonlinear. The amplifications of soil accelerations were more severe at lower normalized frequencies (ωH/V) compared to higher normalized frequencies. The coefficient of hydrodynamic force, C, of the plate anchor was found to be almost constant with anchor inclinations. Finally, the seismic anchor holding coefficient oscillated with the oscillation of the inertia force on the plate anchor.

• 한국가금학회지
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• 제35권2호
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• pp.177-182
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• 2008

본 연구는 육계를 도계장에 도착한 후 수송 차량위에서 $1{\sim}2$시간, $7{\sim}8$시간, $14{\sim}15$시간 동안 계류시키면서 일반 도계장에서 사용하는 방법으로 도체를 처리하고, 통닭 및 부분육의 품질을 조사하였다. 계류 시간에 따른 통닭의 품질은 계류 시간이 짧은 $1{\sim}2$시간 처리구에서 계류 시간이 긴 $14{\sim}15$시간 처리구보다 $1^+$ 등급 출현율이 14% 정도 많이 나타났고, 특히 부분육에서 가슴육의 $1^+$ 등급 출현율이 계류 $1{\sim}2$시간 처리구에서 15% 정도 높게 나타났다. 가슴육의 PSE 출현율이 도계장내에서 육계가 수송 트럭위에서 장시간 계류함에 따라 높게 나타났다. 도체의 pH 변화는 짧은 $1{\sim}2$시간 계류보다 $7{\sim}8$시간 계류에서 보다 낮은 pH를 나타냈으나, 계류 시간이 $14{\sim}15$시간으로 장기화될 때 다시 $1{\sim}2$시간 계류와 비슷한 값을 나타냈다. 육색에서 명도는 $1{\sim}2$시간 계류 보다 $7{\sim}8$시간 계류에서 보다 낮은 명도 값을 나타내었다. 계류 시간이 $14{\sim}15$시간으로 증가함에 따라 근육 및 표피에서 다시 상승하는 경향을 나타냈다. 적색도 값은 계류 시간에 따라 큰 차이가 없었으나, 황색도 값에서는 짧은 $1{\sim}2$시간 계류에 비하여 $7{\sim}8$시간, $14{\sim}15$시간 계류에서 더 낮은 황색도 값을 나타내었다. 육색에 대해 전체적 고찰하였을 경우, 계류 $7{\sim}8$시간에서 육색 변화가 비교적 낮게 나타났다. 결과적으로 장시간 계류하는 것은 전체적으로 닭고기 품질을 저하시키는 큰 요인으로 작용하였다.

• 소성∙가공
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• 제8권4호
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• pp.347-355
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• 1999

The paper is concerned with an improved scheme for application of the blank holding force in order to take account of the thickness distribution in the sheet material of the flange region. The scheme incorporates with a modified membrane finite element method for planar anisotropic materials. The new scheme proposed two coefficients α and βto calculate the compressive stress in the sheet metal due to the blank holding force, which should be determined properly for accurate analysis. The effect of αand βon the blank holding force distribution and the deformed shape is investigated with simulation of rectangular cup deep drawing processes by changing parameter values.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 춘계학술대회 논문집
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• pp.597-601
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• 1997

The technology of Semi-Solid Forging(SSF) has been actively developed to fabricate near-net shape products using light and hardly formable materials. Generally, the SSF process is composed of slug heating,forming,compression holding and ejecting step. After forming step in SSF, the slug is comperssed during a certain holding time in order to be completely filled in the die cavity and be accelerated in solidification rate. This paper presents the analysis of temperature,solid fraction and shrinkage at compression holding step for a cylindrical slug,then predicts the solidification time to obtain the final shaped part. Enthalpy-based finite element analysis is performed to solve the heat transfer problem considering phase change in solidification.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1998년도 춘계학술대회논문집
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• pp.107-112
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• 1998

The semi-solid materials(SSMs) fabricated under electric-magnetic stirring condition are necessary to be applicated in the thixoforging process. The optimal reheating conditions to thixoforging process were investigated with changing the reheating time, holding time, reheating temperatures, capacity, and adiabatic material size. In the case of solid fraction fs=50%, the microstructure of SSM (specimen size:d76X 190) at the condition of the first reheating time 4min, holding time lrnin and reheating temperature 350%, the second reheating time 3min, holding time 3min and reheating temperature 575C, the thlrd reheating time lmin, holding time 2min and reheating temperature 584'C, capacity Q=8.398KW, and adiabatic material size 53mm is obtained with globular microstructure and finest.

• 한국정밀공학회지
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• 제14권10호
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• pp.102-108
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• 1997

The technology of Semi-Solid Forging (SSF) has been actively developed to fabricate near-net- shape products using light and hardly formable materials. Generally, the SSF process is composed of slug heating, forming, compression holding and ejecting step. After forming step in SSF, the slug is compressed during a certain holding time in order to be completely filled in the die cavity and be accelerated in solidification rate. This paper presents the analysis of temperature, solid fraction and shrinkage at compression holding step for a cylindrical slug, then predicts the solidification time to obtain the final shaped part. Enthalpy-based finite element analysis is performed to solve the heat transfer problem considering phase change in solidification.