• 한국전자통신학회논문지
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• 제17권6호
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• pp.1199-1206
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• 2022

본 논문에서는 현대사회에서 전자기기를 스마트폰의 앱을 통해 쉽게 작동시킬 수 있다는 것에 의해 기존의 키패드로만 제어되는 도어락과는 달리 스마트폰을 이용하여 도어락을 제어할 수 있게 앱 인벤터를 이용하여 앱을 제작하였다. 블루투스 모듈 실험을 통해 장애물이 없을 시 스마트폰과 통신거리가 최대 10m까지 제어가 되었고, 음성인식 실험을 통해 60dB의 소음 시 주파수가 500~1000Hz와 1000~1500Hz에서는 인식률이 각각 85%와 90%로 나왔으며, 80dB 소음 시 500~1000Hz와 1000~1500Hz일 때는 각각 70%와 80%의 인식률을 보였다. 실험 평가 결과를 통해 편의성과 보안성을 향상할 수 있음을 확인할 수 있었다.

• Interaction and multiscale mechanics
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• 제6권3호
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• pp.301-316
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• 2013

The influence of indenter geometry on nanoindentation was studied using a static molecular dynamics simulation. Dislocation nucleation, dislocation locks, and dislocation movements during nanoindentation into Al (001) were studied. Spherical, rectangular, and Berkovich indenters were modeled to study the material behaviors and dislocation activities induced by their different shapes. We found that the elastic responses for the three cases agreed well with those predicted from elastic contact theory. Complicated stress fields were generated by the rectangular and Berkovich indenters, leading to a few uncommon nucleation and dislocation processes. The calculated mean critical resolved shear stresses for the Berkovich and rectangular indenters were lower than the theoretical strength. In the Berkovich indenter case, an amorphous region was observed directly below the indenter tip. In the rectangular indenter case, we observed that some dislocation loops nucleated on the plane. Furthermore, a prismatic loop originating from inside the material glided upward to create a mesa on the indenting surface. We observed an unusual softening phenomenon in the rectangular indenter case and proposed that heterogeneously nucleating dislocations are responsible for this.

• 물과 미래
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• 제12권1호
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• pp.60-71
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• 1979

In general, the lock structure is built at place of having great deal range for dealing with effective ships operation such as in the west coast of Korea. In Inchon harbour, the two locks of 10 KT and 50 KT tonnage class in total has been constructed for several years age, however, it has been recorded many waiting vessels at outer harbour due to the increment of oceangoing vessels & shortage of berthing facilities in accordance with beyond expectation of cargo amount increment. This paper attempts to solves the waiting vessels problem at outer harbour by simulation in applying queing theory. It is found that the simulation results such as average queue time, service time, and queue length during lock operation can be applied to find the minimum of the cost function for determination of optimum Lock Size

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2014년도 춘계학술대회 논문집
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• pp.165-170
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• 2014

Quantifying the perception of human is of great interest for the optimal characterization of the interaction of persons with their environment. The direct approach to such measurements is based on jury-test methods. In this study we considered which jury-test method is more efficient and exact way to measure the preferences for operating sound of car. Moreover we needed to research selection criteria of jury-test methods in accordance with the properties of sound samples. We choose two sample sounds; door locks which generate simple impact sounds and window lifts which are consisted of long and complex sound. For each sound sample we conducted two jury-test methods respectively and discussed about the results.

• 한국경영과학회지
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• 제21권1호
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• pp.31-50
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• 1996

In this paper we prescribe a replication server scheme with an algorithm DRF (Differential Refresh File) to refresh multiple materialized views and replicas in distributed environments. Before sending relevant tuples in server sites to client sites, an effective tuple reduction scheme is developed as a preprocessor to reduce the transmission cost. Because it utilizes differential files with out touching base relations, the DRF scheme can help to minimize the number of locks, which enhances the system's performance.

• 지질공학
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• 제7권1호
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• pp.1-10
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• 1997

우리나라가 물류난을 극복하고 지속적인 경제발전을 위해서는 한강과 낙동강을 잇는 경부운하의 건설이 필요하다. 경부운하는 한강 신곡수중보에서 시작하여 팔당, 강촌, 조정지, 동량 2단, 충주 및 송계댐의 갑문을 거쳐 높이 125m, 길이 20.5km의 조령터널에 이르며, 터널은 수평으로 낙동강 상류와 연결된다. 지질 및 지형도상에서 확인된 한강 구간의 댐과 터널 구조물의 입지는 양호한 것으로 판단되며, 높은 갑문의 운용으로 인해 다량으로 소비되는 용수의 확보도 충주호의 상류에 댐을 추가 건설하거나, 절수갑문의 도입으로 해결가능한 것으로 나타났다.

• 한국가구학회지
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• 제28권1호
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• pp.72-79
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• 2017

The knobs of the Joseon dynasty furniture were mainly made with metal in its consideration about durability and decorative characteristics, small pieces of furniture, the Kori types of knobs, big furniture, that desires, descendants. Meanwhile huge furniture had Butchimdae which can be used also as the locking mechanisms, or just the locks which were used as handle. The handle type included the idea of shamanism that desiring health and longevity, scholarly spirit and prosperity of descendants, therefore the design metaphorically contained the shape of the long-living and prolific animals and plants. Even though traditional furniture were constructed as succinct proportions and simple decoration because of the affect of Confucianism. Therefore, we can notice the hope forefathers indwelling in the handles made of metal.

• 한국막학회:학술대회논문집
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• 한국막학회 1996년도 추계 총회 및 학술발표회
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• pp.12-17
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• 1996

The structure formation by liquid-liquid(L-L) phase separation coupled with crystallization in isotactic polypropylene(i-PP). solutioos was investigated by a temperature jump experiment. A series of dialkyl phthalates with a different number of carbon atoms in the alkyl chain was used to control the interaction between polymer and solvent. Various thermal quench conditions were applied to the i-PP solutions to control systematically L-L phase separation and crystallization. A slow crystallizatina elongates the liquid droplets in the radial direction of a spherulite. A rapid crystallization under the deep quench locks-in the growth of L-L phase separation. These results indicate that the extent of L-L phase separation which exists below melting point can be successfully controlled through the proper selection of solvent and thermal conditions.

• BMB Reports
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• 제38권5호
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• pp.533-538
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• 2005

The kinetics of thermal dissociation of superoxide dismutase (SOD) was studied in 0.05 M Tris-HCl buffer at pH 7.4 containing $10^{-4}\;M$ EDTA. The number of conformational locks and contact areas and amino acid residues of dimers of SOD were obtained by kinetic analysis and biochemical calculation. The cleavage bonds between dimers of SOD during thermal dissociation and type of interactions between specific amino acid residues were also simulated. Two identical contact areas between two subunits were identified. Cleavage of these contact areas resulted in dissociation of the subunits, with destruction of the active centers, and thus, lost of activity. It is suggested that the contact areas interact with active centers by conformational changes involving secondary structural elements.

• 한국공작기계학회논문집
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• 제15권6호
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• pp.121-126
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• 2006

Snap-fit is being used in manufacture of plastic products. Integral features using snap-fit are classified as locks, locators and enhancements. Locking features complete the process of attachment by providing physical interference to prevent separation. Looking feature pairs consist of two components, i.e., a flexible latch and a rigid catch and require particular care and attention for their selection. We can make several locking feature pairs by selecting latch and catch, but some parts restrict freedom of selection. Therefore, part designers must know the characteristic properties of generic locking feature forms as considering a specific design problem. In this paper, it has been presented about problem of small size products using locking feature and then introduced new locking feature applicable to small parts.