• 센서학회지
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• 제13권4호
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• pp.309-315
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• 2004

In the pressure sensor, about below 20 kPa, the center boss diaphragm structure is generally used, but it is hard to obtain the high sensitivity because the center boss structure is limited at the thickness and size of diaphragm with chip size. Therefore, this paper suggests that the Center boss structure has surface etched diaphragm using a stress concentration to improve the sensitivity. We carried out the simulation and fabrication applied new diaphragm design. In the result, the sensitivity is improved to 60% without the change of non-linearity (0.14%FS). So, the Center boss of surface etched diaphragm can be applied for the high sensitivity in the low-pressure sensor.

• 한국직업건강간호학회지
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• 제22권2호
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• pp.75-82
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• 2013

Purpose: This study is to investigate the effect of nurse's competency empowerment and boss' job competency recognition on work performance. Methods: 216 nurses participated for data collection which was conducted from September 1, 2011 to September 10, 2011. The collected data were analyzed with SPSS/WIN 16.0 and with frequency test, ANOVA, Scheff$\acute{e}$ test and Multiple regression. Results: Firstly, the work performance in accordance with subject's general characteristics was found to be significant in the 50s, graduate school or higher education, Roman Catholic, charge nurse and 21-years or older. Secondly, the correlation among nurse's competency empowerment, boss' competency recognition and work performance was found to be positively related (r=.501~.639, p<.001). Thirdly, competency empowerment was found to be the most effective factor for work performance, followed by boss' competency recognition and career year, and these factors accounted for 63.5%. Conclusion: As the results show that the work performance is highly affected by the nurse's competency empowerment, boss' competency recognition level and career level in clinical environment, effective education programs are required to provide an appropriate experience to both entry-level and experienced nurses, as well as to enhance boss' competency empowerment at the same time.

• 한국통신학회논문지
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• 제39A권7호
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• pp.365-371
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• 2014

카오스 통신 시스템은 카오스 신호를 이용하여 시스템의 보안성을 향상시킨다. 또한, 도청 확률을 줄일 수 있으며, 간섭 신호나 재밍 신호에 강한 특징을 가진다. 하지만 디지털 통신 시스템보다 BER(Bit Error Rate) 성능이 좋지 않은 단점을 가진다. 이런 이유로 인해 카오스 통신 시스템의 BER 성능을 향상시키기 위한 연구가 활발이 이루어지고 있다. 우리는 이전 연구에서 BER 성능을 향상시키기 위해 새로운 카오스 맵을 제안하고 이 카오스 맵을 'Boss map'이라 불렀다. 또한, 새로운 카오스 송수신기 구조를 제안하여 BER 성능을 향상시켰다. 하지만 BER 성능은 송수신기에서 사용하는 지연 시간에 따라 다르게 평가된다. 따라서 Boss map을 효과적으로 사용하기 위해서는 CDSK(Correlation Delay Shift Keying) 방식과 제안된 카오스 송수신기의 최적의 지연시간을 찾아야 한다. 본 논문에서는 Boss map을 사용했을 때, CDSK 방식과 새로운 송수신기 구조의 지연시간에 따른 BER 성능을 평가한다. 지연 시간에 따른 BER 성능을 평가한 후, CDSK 방식과 새로운 송수신기 구조에서 최적의 BER 성능을 가질 수 있는 지연 시간을 확인한다.

• Tribology and Lubricants
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• 제24권4호
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• pp.196-204
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• 2008

In this study, the pressure distributions on the oil film of piston pin bearings are found by two-dimensional lubrication analysis in order to help the optimum design of the bearings of piston pin. The lubrication analysis is carried out together with an equation related with the oil pressure-viscosity index. The oil film pressure distribution is used as an input data for pressure boundary conditions at the piston pin-boss surface. Finally, the piston pin-boss stress distribution coupled with the thermal stress is calculated, and then compared with the results of the stress analysis which is not counted with the oil film pressure boundary condition.

• 식물분류학회지
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• 제53권3호
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• pp.181-200
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• 2023

Owing to the rapid development of sequencing technologies, more than 1,000 plant genomes have been sequenced and released. Among them, 69 Korean plant taxa (85 genome sequences) contain at least one whole-genome sequence despite the fact that some samples were not collected in Korea. The sequencing-by-synthesis method (next-generation sequencing) and the PacBio (third-generation sequencing) method were the most commonly used in studies appearing in 65 publications. Several scaffolding methods, such as the Hi-C and 10x types, have also been used for pseudo-chromosomal assembly. The most abundant families among the 69 taxa are Rosaceae (10 taxa), Brassicaceae (7 taxa), Fabaceae (7 taxa), and Poaceae (7 taxa). Due to the rapid release of plant genomes, it is necessary to assemble the current understanding of Korean plant species not only to understand their whole genomes as our own plant resources but also to establish new tools for utilizing plant resources efficiently with various analysis pipelines, including AI-based engines.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2004년도 추계학술발표대회 논문집
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• pp.224-227
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• 2004

A computer program for composite pressure vtlssel design is developed. In-puts are : material-property(young's modulus, shear modulus, tensile strength, poisson's ratio, density), operating pressure, burst pressure, liner thickness, boss diameter, boss weight and number of helical angles. Out-puts are; thickness of each layer, weight of the vessel, dimension of the vessel, inner volume, dome-shape and helical winding angle. Also filament winding angles can be selected various kinds of utilizing virtual boss diameter.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2006년도 춘계학술발표논문집
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• pp.394-396
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• 2006

본 논문은 새로운 영상 압축 알고리즘 BOSS (Block-Based Object Selection System) 을 제안한다. 본 알고리즘은 디지털 감시시스템 (Digital Surveillance System: DSS)을 위한 영상 압축 부호화 기법으로서 영역분할을 통해 Macro block 단위로 물체 영역과 배경영역을 재구성해서 부호화에 이용하는 방식이다. 제안된 알고리즘은 매우 효율적인 압축 성능을 보여주며, 저 전송률 상황에서도 높은 질의 영상을 복원할 수 있다.

• 천문학회보
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• 제40권1호
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• pp.80.2-80.2
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• 2015

We present spatial and chemical distributions of Carbon-Enhanced Metal-Poor (CEMP) stars in the Milky Way's halo, as observed by the Baryon Oscillation Spectroscopic Survey (BOSS). Although the BOSS was designed to obtain spectra of galaxies and quasars, it also observed numerous metal-poor main-sequence turnoff stars for the purpose of flux calibration. The stars observed in the BOSS are two magnitudes fainter (15.5 < g < 19.2) than those in the legacy SDSS, thus it is an extremely useful sample to probe the distant halo. Using effective temperatures, surface gravities, [Fe/H], and [C/Fe] derived for these stars by the SEGUE Stellar Parameter Pipeline (SSPP), we investigate the spatial distribution of [Fe/H] and [C/Fe], the distribution of [C/Fe], and frequency of CEMP stars among these stars. These tools enable characterization of the origin of the halo and its initial mass function.

• 한국공작기계학회논문집
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• 제12권1호
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• pp.50-57
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• 2003

In this paper, an automated design and 3-D modeling system of an axial fan and a boss for cooling towers was developed. API and parametric design Provided by a commercial solid-modeler are engaged to automate modeling process. Design data of the boss are assumed to be given by a user with design experiences while the fan from the fan design program using three-dimensional flow analysis. An algorithm avoiding the interferences between fans and a boss is developed. The design data are registered on the database not only to remove duplicate design but also to transfer the data to ERP system.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2008년도 춘계학술대회논문집
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• pp.605-608
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• 2008

In this paper, a numerical investigation of three-dimensional, two-phase flow field around a butterfly valve is conducted. The butterfly valves that have different opening angles, $10^{\circ}{\sim}90^{\circ}$, and two profiles of the shaft boss are compared with various cavitation numbers and Reynolds numbers. This paper focused on the flow analysis in the original butterfly valve and new design butterfly valve in order to decrease cavitation and loss. It is found that the butterfly valve with a cone-type shaft boss greatly reduces the cavitation and loss, compared to the original shaft boss by 20${\sim}$30%.