• 디자인학연구
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• 제14권4호
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• pp.65-75
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• 2001

주방 디자인의 패션화와 동서양 문화의 퓨전적 현상은 식기의 다양화와 세분화를 요구하고 있으며, 식사는 단지 먹는다는 의미보다 무엇을, 어디에, 어떻게 먹느냐의 문제로 발전되게 되었다. 이러한 문제는 자연이 현대의 식생활과 라이프 스타일에 부응하는 합리적이고 미적인 식기 개발을 요구하게 되었다. 이에 본 연구에서는 전통과 현대의 조화로운 만남, 젊은 감성과 품격을 동시에 충족시켜 줄 수 있는 미래형 식기 및 테이블 클로스 디자인을 연구하여 개발하는데 그 목적을 두었다. 연구의 방향은 식탁문화의 패션화와 퓨전적 현상에 따른 식기 사용의 세분화, 전문화, 다양화 욕구를 효율적으로 만족시키고자 고정된 세트 개념이 아닌 끝없이 연속되는 열린 코디네이션 개념을 식기에 도입하고, 색채 역시 믹스 앤 매치 방식의 칼라 코디네이션으로 다양한 식탁 표현을 연출 할 수 있는 새로운 식기 디자인을 통하여, 보수적인 우일요 이미지를 전통과 현대의 조화로운 젊은 감성과 감각의 이미지로 개선하였다. 연구의 디자인 개발 대상은 런치 웨어로 식기류 15품목 15종, 테이블 클로스 3품목 4종 등 총 19종과 디너 웨어로 식기류 8 품목 8종과 테이블 클로스 1품목 1종 등 총 9종으로 하였다. 연구결과 S/S 런치 웨어 세트로 테이블 웨어 디자인 15품목과 테이블 클로스 3품목이 개발되었으며, F/W 디너 웨어 세트로는 5종이 개발되었다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.711-716
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• 2003

This study considers the implementation issues of the inter-vehicle communication system for the vehicle platoon experiments via a testbed. The testbed, which consists of three scale vehicles and one RCS(remote control station), is developed as a tool for functions evaluation between simulation studies and full-sized vehicle researches in the previous study. The cooperative communication of the vehicle-to-vehicle or the vehicle-to-roadside plays a key role for keeping the relative spacing of vehicles small in a vehicle platoon. The static platoon control, where the number of vehicles remains constant, is sufficient for the information to be transmitted in the suitably fixed interval, while the dynamic platoon control such as merge or split requires more flexible network architecture for the dynamical coordination of the communication sequence. In this study, the wireless communication device and the reliable protocol of the flexible network architecture are implemented for our testbed, using the low-cost, ISM band transceiver and the 8-bit microcontroller.

• 대한산업공학회지
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• 제34권2호
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• pp.140-150
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• 2008

Point Coordination Function (PCF) of the IEEE 802.11 protocol providing a centrally-controlled polling-based multiple access to a wireless channel is very efficient in high load conditions. However, its performance degrades with increasing the number of terminals and decreasing the load, because of wastes related to unsuccessful polling attempts. To solve the problem, we propose and study analytically the generic dynamic polling policy using backoff concept. For this aim, we develop Markov models describing the network queues changes, what allows us to estimate such performance measures as the average MAC service time and the average MAC sojourn time, to show the dynamic polling efficiency and to tune optimally the backoff rule.

• Applied Science and Convergence Technology
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• 제24권3호
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• pp.60-66
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• 2015

The modified amorphous GeTe formed by pulsed laser irradiation in as-grown GeTe has been analyzed in terms of variations of local bonding structure using extended x-ray absorption fine structure (EXAFS). The modified GeTe film has octahedral-like Ge-Te bonding structure that can be effectively induced by irradiation process. The EXAFS data clearly shows that the irradiation can lead to reduction of the average coordination number. Variations in the transition temperature for the irradiated film during crystallization can be described by the presence of octahedral-like local structure.

• 한국세라믹학회지
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• 제31권10호
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• pp.1107-1114
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• 1994

Although various theories have been presented on the mechanism of setting retardation of plaster in addition to organic admixtures. The purpose of this paper is that Hydration studies of plaster of paris in the presence of carboxylic acids under alkalinity are examined in the coordination chemistry. Setting of plaster of paris is retarded by the addition of carboxylic acids except oxalic acid. And setting of plaster of paris contained 5 wt% of Ca(OH)2 is also retarded by the addition of above-mentioned carboxylic acids. The degree of retarding effect under alkalinity is found to be a function of the number of the functional group and the length of carbon chain of carboxyl acids. These reasons are attributed to the soluble complex formation, that is calcium complex formation between calcium ion and carboxylic acids. The author's proposal was confirmed by the results of electrical conductivity measurement. The formation of calcium complex was surpported by IR spectra.

• The Korean Journal of Ceramics
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• 제1권2호
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• pp.106-110
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• 1995

A structural analysis of dickite prepared by dry grinding with different grinding time has been made by X-ray diffraction. The $SiO_4$ tetrahedra are found to remain unchanged in the ground dickite samples by analysing the radial distribution function(RDF). On the other hand, with an increase of the grinding time a change in oxygen coordination number around aluminum has been quantitatively confirmed. This variation may be attributed to the change of hydroxyl induced by the prolonged grinding.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1992년도 하계학술대회 논문집 A
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• pp.126-129
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• 1992

Compared to other sources of electricity such as Thermal and Nuclear power plant, dispersed storage and generation system (DSG) is environmentally clean, quiet and efficient, thus this source is expected to be introduced In urban area by the utilities and customers. If a great number of DSG will be applied to electric power system in the rear future (around 2000, in Korea), these will give a great influence on the existing power system. In other words, the interconnection to electric power system of these source may bring many problems such as system operation, protection coordination, and service quality related with voltages (110${\pm}$6V, 220${\pm}$13V), harmonics (5%) and pour factor (90% over). So, this analysis of the interconnection to power system of DSG is required

• 동력기계공학회지
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• 제21권2호
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• pp.57-63
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• 2017

The large-eddy simulation(LES) was carried out to evaluate the drag and static pressure acting on the blade surface of a small-size axial fan(SSAF) under the condition of unsteady-state, incompressible fluid and three-dimensional coordination. The axial component of drag coefficient increases with the increase of operating load, but the radial components have negligible sizes regardless of operating loads. Otherwise, the static pressures acting on the blade surfaces of SSAF show different distributions around the operating point of D equivalent to the stall. Also, with the increase of operating load, the static pressures acting on the pressure and suction surfaces of blade concentrate at the tips and leading-edges as a whole.

• 대한산업공학회지
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• 제3권1호
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• pp.49-53
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• 1977

The coordinated control of the traffic signals of adjacent intersections can reduce delays, relative number of stops and congestions in the coordinated traffic area. The road capacity can be increased to a certain extend because the stopping and starting of vehicles facing red traffic lights can be avoided in many instances due to the progression established along an artery. However, if traffic centers or leaves the main flow in irregular volumes on the intermediate road section, a coordination of traffic signals is unnecessary and may even be harmful. Therefore, a computer simulation model to simulate and predict the effectiveness of a synchronized traffic signal system in the CBD of Seoul was developed and alternative policy variables, such as cycle time, offsets, phase splits, to be fed into the simulation model had to be generated. This is a report of (1) the development of a heuristic algorithm for the determination of phase splits when there are amber periods specifically reserved for left turns and (2) the computerization of time-space diagramming.

• 대한산업공학회지
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• 제33권2호
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• pp.237-245
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• 2007

In this paper, a modified PCF (Point Coordination Function) MAC (Medium Access Control) Protocol is proposed to support the multiple direct link communication between STAs (STAtions) in infrastructure mode IEEE 802.11 wireless LANs. By the proposed MAC protocol, the direct link communication between STAs, which are located within the communication range of each other, is allowed without the use of AP (Access Point) as a relay. Moreover, when multiple direct data communication between STAs can be simultaneously performed with a sufficiently small interference, multiple simultaneous direct link communication is allowed for the efficient use of radio bandwidth. AP polls STAs to grant the transmission opportunities using the direct link communication by transmitting the polling frames to STAs. An efficient polling method for granting the transmission opportunities to STAs is proposed to reduce the number of the polling frame transmissions and enhance the PCF MAC performance.