• 한국정밀공학회지
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• 제33권8호
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• pp.611-616
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• 2016

Computational fluid dynamic simulation based on the ABAQUS software was conducted to observe the inside flow of slot-die nozzle. The slot-die nozzle was modeled as 3-dimensional structure and three significant parameters were determined: inlet velocity of fluid, reservoir angles, number of strips none of which have been mentioned previously in the literature. The design of experiment, full factorial analysis was performed within determined design and process levels. The simulation result shows the inlet fluid velocity is most significant factor for the flows of inside nozzle. As an interaction effect, reservoir angle is closely related with number of strip that should address when the nozzle is designed. Moreover, the optimized values of each determined parameter were obtained as 35 mm/s of inlet velocity, 3 of strip numbers, and $22^{\circ}$ of reservoir angles. Based on these parameters, the outlet velocity was obtained as 0.53% of outlet uniformity which is improved from 8.67% of nominal results.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1993년도 하계학술대회 논문집 B
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• pp.929-931
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• 1993

The design sensitivity analysis based on the finite element method is presented for the eddy current problem with a voltage source. Since, in this problem, the complex variable is used as the state variable, new approach to the sensitivity calculation for the complex variable system is required. Its result is applied to the design of the rotor slot shape of squirrel cage induction motor. As a analysis model, only one slot pitch of rotor is analyzed by using a Periodic boundary condition. The use of this minimal modelling method leads to much saving of calculation time. The design objective is to obtain the desired slip-torque characteristic. Because the shape of rotor slot has much influence on the slip torque characteristic, the design variables are taken on the interface shape between rotor core and rotor bar. The initial shape of rotor slot is the trapezoidal type with rounding corners. The obtained final shape is quite similar to the double squirrel cage type.

• 한국융합학회논문지
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• 제12권1호
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• pp.57-63
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• 2021

사람의 발화 내용을 이해하도록 하는 언어 인식 시스템은 주로 영어로 연구되어 왔다. 본 논문에서는 시스템과 사용자의 대화 내용을 수집한 말뭉치를 바탕으로 언어 인식 시스템을 훈련시키고 평가할 때 사용할 수 있는 한국어 데이터셋을 개발하고, 관련 통계를 제시한다. 본 데이터셋은 식당 예약이라는 고정된 주제 안에서 사용자의 발화 의도와 슬롯 채우기를 해야 하는 데이터셋이다. 본 데이터셋은 6857개의 한국어 문장으로 이루어져 있으며, 표기된 단어 슬롯의 종류는 총 7개이다. 본 데이터셋에서 표기된 발화의 종류는 총 5개이며, 문장의 발화 내용에 따라 최대 2개까지 동시에 기입되어 있다. 영어권에서 연구된 모델을 본 데이터셋에 적용시켜 본 결과, 발화 의도 추측 정확도는 조금 하락하였고, 슬롯 채우기 F1 점수는 크게 차이나는 모습을 보였다.

• 대한전자공학회논문지
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• 제23권2호
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• pp.131-148
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• 1986

A field ploblem of a grounded dielectric slab covered by a conducting plane with periodecally spaced arbitrary number of slots excited by an aperiodis source is analyzed. The problem is formulated in terms of simultaneous integral equations for unknown electric fields at each slot. A sampling technique is introduced to reduce the system equations to a matrix equation equation involving Green's function matrix. The solution obtained in the form of infinite series is transformed, into a more rapidly convergent one in its final stage. Theoretical results agree closesly with the experimental results.

• 산업공학
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• 제12권1호
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• pp.19-25
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• 1999

The time slot scheduling problem for a satellite cluster with an arbitrary number of satellite is considered, which is one of the most interesting problems in the satellite communication scheduling area. This problem is known to be NP-complete, and several heuristic algorithms have been proposed. In this paper, a new efficient algorithm is suggested, which has lower computational complexity and provides much better solution than other existing algorithms.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.1672-1675
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• 2003

Microstrip antennas have many applications in wireless communication system. This paper propose a analytical far-field pattern of radiation for application of the wireless communication. The triangular slot antenna fed by micorstrip line is proposed at resonance frequency 10 GHz. The simulation results of the electromagnetic field radiation pattern, S parameter, characteristic of input impedance are obtain by using the finite difference time domain (FDTD) method. The analytical space in FDTD analysis are $50{\times}171{\times}120$ cells with the cell dimension ${\Delta}x=0.152\;mm$, ${\Delta}y={\Delta}z=0.15\;mm$.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2001년도 추계학술대회논문집 I
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• pp.325-328
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• 2001

Disc brake squeal is caused by mechanical vibrations generated from friction force excitations exerted by the pad on the rotor. In order to understand the origin of these vibrations and to speed up the design, the characterization of the individual brake system components is desirable. In this paper, the results of modal analysis are presented in terms of several slot-type with free-free boundary conditions. Special attention is paid to variations of the natural frequency at each vibration mode as the result of modifying slot pattern.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2012년도 추계학술대회
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• pp.635-637
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• 2012

In Gen-2 Q-algorithm, the value of initial $Q_{fp}$ and weight C is not defined in the standard. If we let the initial $Q_{fp}$ be large or small, the number of empty slot will be large during the initial query round or almost all the slots will be collided, respectively. Also, if the reader selects an inappropriate weight, there are a lot of empty or collided slots. As a result, it is anticipated that the performance will be declined because the frame size does not converge to the optimal point quickly during the query round. In this paper, we analyze how the performances of Gen-2 Q-algorithm will be affected by the weight and initial slot-count size.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.70-72
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• 2002

LPM that is used for head driver is problem of miniaturization of construction and cost. This can be achieved by most suitable shape decision. and suitable selection of control system. Specially, in LPM that Full step is mm$\sim$um unit. the large change of thrust receives much effect by tooth number per pole. tooth width and slot width about change of the air gap length. Therefore, this paper presents LPM that use for suitable head driver to reduce of the structure and the cost. to generate maximum thrust of LPM, and finds the proportion of the tooth pitch to tooth width and the slot width about change of the air gap length through FEM analysis. Also, applying different tooth width and slot width that is given as analysis result. this paper presented model that thrust is improved.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 C
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• pp.1846-1849
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• 2002

A shorted-turn test was performed at the Sininchon combined cycle power plant on gas turbine generators. The test was conducted using a permanent flux probe and on-line diagnosis system. The flux probe installed in the generator air gap senses the field winding slot leakage flux and produces a voltage proportional to the rate of change of the flux. This pattern of flux variation is a signature unique to each field winding. We have also applied a voltage waveform analysis technique that can identify the pole location, slot number and number of shorted-turn with each slot.