• The Journal of Asian Finance, Economics and Business
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• 제7권12호
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• pp.139-146
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• 2020

The domain of entrepreneurship has been dotted across various paradigms. Identifying and examining entrepreneurial intention and propensity to it spontaneously require the insight from the lens of psychological approach. The aim of this study is to examine the influence and impact of psychological factors on entrepreneurial intention; as it is found that in Bangladeshi context several entrepreneurship studies are undertaken, still the exploratory research on interplay between the psychological factors (i.e., self-confidence, locus of control, need for achievement, and tolerance for ambiguity) and entrepreneurial intention has been merely found. The study has chosen Bangladeshi university students as the unit of analysis and the ultimate sample size in this research is n=265. The current paper is a quantitative study where sampling method is followed by convenience sampling technique, and study data is collected through survey questionnaire. Data has been compiled into SPSS whereas, for hypotheses assessment, Smart PLS software is applied. The results reflect that self-confidence, locus of control, and need for achievement are revealed as contributory determinants of entrepreneurial intention while tolerance for ambiguity is found as an insignificant predictor. The current research is expected to offer an in-depth understanding about the significance of psychological factors in examining entrepreneurial intention.

• Current Optics and Photonics
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• 제4권6호
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• pp.509-515
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• 2020

A practical single photon source for fiber-based quantum information processing is still lacking. As a possible 1.55-㎛ quantum-dot single photon source, an InGaAsP/InP-air-aperture micropillar cavity is investigated in terms of fabrication tolerance. By properly modeling the processing uncertainty in layer thickness, layer diameter, surface roughness and the cavity shape distortion, the fabrication imperfection effects on the cavity quality are simulated using a finite-difference time-domain method. It turns out that, the cavity quality is not significantly changing with the processing precision, indicating the robustness against the imperfection of the fabrication processing. Under thickness error of ±2 nm, diameter uncertainty of ±2%, surface roughness of ±2.5 nm, and sidewall inclination of 0.5°, which are all readily available in current material and device fabrication techniques, the cavity quality remains good enough to form highly efficient and coherent 1.55-㎛ single photon sources. It is thus implied that a quantum dot contained InGaAsP/InP-air-aperture micropillar cavity is prospectively a practical candidate for single photon sources applied in a fiber-based quantum information network.

• 대한산업공학회지
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• 제21권3호
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• pp.441-461
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• 1995

This research proposes an Integrated Product Information Model (IPIM) using STEP (Standard for the Exchange of product model data) for Computer Integrated Manufacturing (CIM) of Concurrent Engineering (CE). IPIM is based on Geometry and Topology (STEP Part 42), Form Feature (STEP Part 48), and Tolerance (STEP Part 48) for representing the integrated information of mechanical parts. For the IPIM, 1) new entities are developed for integration of existing entities, and 2) the existing entities are restructured and modified for a special application protocol. In CIM or CE, the advantages of using IPIM having integrated form of geometry, feature and tolerance are 1) integration of product design, process design and manufacturing sequentially or concurrently. 2) keep the product data consistency, modified by different domain, and 3) automatic data exchange between different application software and different hardware. The prototype system is composed of CAD, Data Probe, DBMS and SDAI (Standard Data Access Interface), and the generated STEP data is stored in a step file of DBMS for other applications.

• Journal of Plant Biotechnology
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• 제43권2호
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• pp.204-212
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• 2016

환경스트레스 중의 하나인 저온에 대한 생육기의 포도나무의 반응을 분석하고자 -$2^{\circ}C$에서 4일 동안 저온처리 한두 품종('Campbell Early'와 'Muscat Baily A')의 포도나무잎을 이용하여 전사체를 분석하였고 특이발현유전자(differentially expressed genes, DEGs)를 검색하였다. 영하의 저온에 반응한 'Campbell Early'의 DEG를 기능별로 분석한 결과 생물대사에서 17,424개, 세포구성에서 28,954개, 분자기능에서는 6,972개의 유전자와 관련이 있었다. 발현이 유도되는 유전자로는 dehydrin xero 1, K-box region and MADS-box transcription factor family protein과 MYB domain protein 36이 있으며, 억제되는 유전자로는 light-harvesting chlorophyll B-binding protein 3, FASCICLIN-like arabinoogalactan 9와 pectin methylesterase 61 등이 있었다. 'Muscat Baily A'의 DEG는 생물대사에서 1,157개, 세포구성에서 1,350개, 분자기능에서는 431개의 유전자와 관련이 있었다. 발현이 유도되는 유전자로는 NB-ARC domain-containing disease resistance protein, fatty acid hydrozylase syperfamily와 isopentenyltransferase 3이 있으며, 억제되는 유전자로는 binding, IAP-like protein 1과 pentatricopeptide repeat superfamily protein 등이 있었다. Real-time PCR을 이용하여 영하의 저온에서 특이적으로 발현하는 유전자들을 검정하였으며, InterPro Scan을 통해 단백질 도메인을 분석한 결과 두 품종 모두에서 ubiquitin-protein ligase가 가장 많았다. 영하의 저온에 노출된 신초의 전사체 정보를 바탕으로 포도나무에서 저온 내성을 발현하는 기작을 연하는 데에 분자수준의 정보를 제공하고, 내한성 포도를 육종하는데 이용될 수 있을 것이다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2021년도 추계학술대회
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• pp.228-228
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• 2021

• 전력전자학회:학술대회논문집
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• 전력전자학회 1996년도 창립기념 전력전자학술발표회 논문집
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• pp.43-46
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• 1996

The carborne Automatic Train Control(ATC) system keeps automatically optimum train speed code signals from wayside(track) circuit equipment. If there is no response for braking against the over speed detected, the driver will be noticed instantly by visual and audible warning signals. And then the ATC processes into braking mode for safe train operations to prevent any hazards by over speed limit. In this paper we are introduced the novel ATC system which has triple constructed structure made by 32 bit floating point DSP(ADSP21020-20) and process dealed with frequency domain and time domain for detecting signals. Owing to these reason it is no needed several band pass filters used in conventional ATC systems to detect the speed limit frequency. Also system's reliability and tolerance are incremented by adopt to 2 out of 3 logic to the outputs decision.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.521-522
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• 2006

This paper presents behavioral models using SIMULINK and Verilog-a for a PLL based fractional-N frequency synthesizer. The SIMULINK modeling was built in the frequency-time mixed domain whereas the Verilog-a modeling was built purely in the time domain. The simulated results of the two models were verified to show the same performance within the error tolerance. This top-down design method can provide the readiness for the transistor-level design.

• Progress in Superconductivity
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• 제8권1호
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• pp.8-15
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• 2006

The size of the superconducting domains and the critical current density inside these domains have to be enhanced for most of cryomagnetic applications of melt-textured YBCO bulks. To enlarge the size of the domains we studied the multi-seeding technique based on a well-established procedure for preparing high quality YBCO monoliths using self-made SmBCO seeds. The distance between the seeds was optimised as a result of the investigation of the effects of various seed distances on the characteristics of the grain boundary Junctions. The influences of a-b plane intersections and c-axis misalignments were researched. Thereby, a small range of tolerance of the misorientations between the seed crystals was found. Field mapping was applied to control the materials quality and the superconductor's grain structure was investigated using polarisation microscopy. YBCO function elements with iou. seeds in a line and an arrangement of making type (100)/(100) and (110)/(110) boundary junctions, respectively, were processed. The trapped field profile in both sample types shows single domain behaviour. To demonstrate the potential of the multi-seeding method a ring-shaped sample was processed by placing sixteen seeds in a way to make both (100)/(100) and (110)/(110) grain junctions at the same time. The results up to now are very promising to prepare large single domain melt-textured YBCO semi-finished products in complex shapes.

• ETRI Journal
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• 제43권6호
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• pp.966-977
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• 2021

Filterbank multicarrier with offset quadrature amplitude modulation (FBMC-OQAM) is an attractive alternative to the orthogonal frequency division multiplexing (OFDM) modulation technique. In comparison with OFDM, the FBMC-OQAM signal has better spectral confinement and higher spectral efficiency and tolerance to synchronization errors, primarily due to per-subcarrier filtering using a frequency-time localized prototype filter. However, the filtering process introduces intrinsic interference among the symbols and complicates channel estimation (CE). An efficient way to improve the CE in FBMC-OQAM is using a technique known as windowed frequency domain averaging (FDA); however, it requires a priori knowledge of the window length parameter which is set based on the channel's frequency selectivity (FS). As the channel's FS is not fixed and not a priori known, we propose a k-nearest neighbor-based machine learning algorithm to classify the FS and decide on the FDA's window length. A comparative theoretical analysis of the mean-squared error (MSE) is performed to prove the proposed CE scheme's effectiveness, validated through extensive simulations. The adaptive CE scheme is shown to yield a reduction in CE-MSE and improved bit error rates compared with the popular preamble-based CE schemes for FBMC-OQAM, without a priori knowledge of channel's frequency selectivity.

• 한국전자파학회논문지
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• 제16권4호
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• pp.373-379
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• 2005

Schroeder 방식의 1 Dimension QRD(quadratic Residue Diffuser)를 사용하여 잔향실 내부에서의 필드 균일성이 향상됨을 밝힌 연구는 이미 수 차례 발표된 바 있다. 본 연구에서는 $2.3\;\cal{GHz}\~3\;\cal{GHz}$대역에서, 전자파 잔향실의 전자기장 특성 및 필드의 균일도 향상을 위해 잔향실 내에 Schroeder 방식의 CRD(Cubical Residue Diffuser)가 설계 및 적용되었고 필드 분포 해석을 위해 FDTD(Finite-Difffrence Time-Domain) 방법의 수치해석이 이루어졌다. 잔향실 내부의 확산기는 cubical residue algorithm과 2D 배열을 사용함으로써 더욱더 random한 형태를 이루었으며 결과적으로 CRD를 사용함으로써 잔향실 내에서의 편파 특성, 표준 편차 및 tolerance 등의 성능이 좋아지는 것을 확인하였다. 또한 2D CRD의 경우, 전력 효율도 높아짐을 알 수 있었다.