• 대한수의학회지
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• 제29권1호
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• pp.57-60
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• 1989

This study was carried out to evaluate the possibility of sex preselection by gradients methods using bovine serum albumin in rabbits. Artificial insemination was performed with sperm from the top and bottom layer of rabbit semen separated by bovine serum albumin gradients. Various characteristics of separated sperm, and the conception rate and secondary sex ratio at artificial insemination with separated sperm were compared. The results obtained were as follows. 1. The sperm from the bottom layer showed significanty high value in motility, percent of normal sperm and progressive motility as compared with control sperm and the sperm and the sperm from the top layer. 2. The conception rate of sperm from the bottom layer was higher than that of the top layer. But secondary sex ratio was not altered by this methods.

• Journal of Mechanical Science and Technology
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• 제15권9호
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• pp.1268-1273
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• 2001

To successfully establish the ELID-grinding, it is important to properly select the electrolytic condition according to grinding conditions. Currently, the selection of electrolytic condition is mainly dependent on the operators experience, which is one of difficulties preventing the successful application of ELID technique. In this study, an in-process measurement system of the insulating layer using two gap sensors-a capacitance type and an eddy current type-are developed and the change of the thickness of insulating layer during ELID grinding is detected. Evaluation experiments show the possibility to control the electrolytic condition through the in-process measurement of the layer status.

• Current Optics and Photonics
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• 제3권1호
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• pp.78-85
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• 2019

The remote phosphor structure has been proven to bear greater luminous efficiency than both the conformal phosphor and in-cup phosphor structures; however, controlling its color quality is much more challenging. To solve this dilemma, various researchers have proposed dual-layer phosphor and triple-layer phosphor configuration as techniques to enhance the display brightness of white LEDs (WLEDs). Likewise, this study picked one of these configurations to utilize in multichip WLEDs with five distinct color temperatures in the range from 5600 to 8500 K, for the purpose of improving the optical properties of WLEDs, such as color rendering index (CRI), color quality scale (CQS), luminous efficacy (LE), and chromatic homogeneity. According to the results of this research, the triple-layer phosphor configuration has superior performance compared to other configurations in terms of CRI, CQS, and LE, and yields higher chromatic stability for WLEDs.

• 한국지반환경공학회 논문집
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• 제14권10호
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• pp.11-16
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• 2013

양방향재하시험의 성공여부는 상향력과 하향력의 균형을 이룰 수 있는 재하장치 위치 선정에 달려있다. 상향력과 하향력의 균형을 이루기 위해서는 발휘되는 단위주면마찰력과 단위선단지지력의 산정이 중요한데, 국내에서 시행되는 양방향재하시험은 주로 사용말뚝에 적용되어 극한지지력까지 재하되지 않고 설계지지력을 확인하는 것이 일반적이다. 하지만 국내 외 제안된 암반층의 극한단위주면마찰력 및 허용단위주면마찰력 산정식은 암반의 일축압축강도를 기반으로 되어있고, 또한 국내 풍화암층과 RQD가 극히 낮은 연암층은 일축압축강도시험을 할 수 있는 코아를 얻기가 어려워 적용이 어려운 실정이다. 따라서 이 연구에서는 국내에서 시행되었던 양방향재하시험에서 얻은 각 지층별 발휘된 단위주면마찰력과 환산된 SPT N/cm과 관계도표를 제안하고 이 관계도표를 이용하여 실제 국내 현장의 양방향재하시험을 위한 상향력과 하향력의 균형위치를 선정하였다. 또한 선정된 균형위치에 양방향재하장치를 설치한 후 재하시험을 실시하여 측정된 각 지층의 발휘된 단위주면마찰력 값들과 균형위치 선정 시 적용한 관계도표의 값들을 비교하여 관계도표의 적정성을 분석하였다. 분석결과 풍화토층과 풍화암층에서는 거의 유사한 결과를 보였고, 연암층에서는 재하장치 상부연암층과 하부연암층에서 발휘된 측정값(상부 $1,151kN/m^2$, 하부 $1,500kN/m^2$)의 평균값($1,325kN/m^2$)도 산정값($1,250kN/m^2$)과 큰 차이를 보이지 않아 관계도표는 적정한 것으로 판단되었다.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2015년도 춘계학술대회 논문집
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• pp.47-47
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• 2015

Atomic layer deposition (ALD) 방법으로 증착시킨 ZnO 기반의 박막물질들을 다양한 종류의 태양전지에서 TCO, Buffer Layer 등으로 활용하기 위한 노력이 최근 이루어지고 있다. 본 발표에서는 ALD를 이용한 ZnO 기반 박막물질들의 광전소자로의 적용을 위한 요구물성을 맞추기 위한 precursor/reactant의 selection을 포함한 공정 parameter가 박막의 물성에 미치는 영향 및 생산성 향상을 위한 ALD 공정장치 개발 예를 소개하고, 광전소자 특성에 미치는 영향을 살펴보았다.

• Structural Engineering and Mechanics
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• 제58권3호
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• pp.555-576
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• 2016

In this paper an efficient approach is introduced for design and analysis of double-layer grids including both geometrical and material nonlinearities, while the results are compared with those considering material nonlinearity. Optimum design procedure based on Enhanced Colliding Bodies Optimization method (ECBO) is applied to optimal design of two commonly used configurations of double-layer grids. Two ranges of spans as small and big sizes with certain bays of equal length in two directions are considered for each type of square grids. ECBO algorithm obtains minimum weight grid through appropriate selection of tube sections available in AISC Load and Resistance Factor Design (LRFD). Strength constraints of AISC-LRFD specifications and displacement constraints are imposed on these grids.

• 한국인터넷방송통신학회논문지
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• 제8권3호
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• pp.57-70
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• 2008

This paper introduces a new paradigm of physical layer security through channel coding for wireless networks. The well known spread spectrum based physical layer security in wireless network is applicable when code division multiple access (CDMA) is used as wireless air link interface. In our proposal, we incorporate the proposed security protocol within channel coding as channel coding is an essential part of all kind of wireless communications. Channel coding has a built-in security in the sense of encoding and decoding algorithm. Decoding of a particular codeword is possible only when the encoding procedure is exactly known. This point is the key of our proposed security protocol. The common parameter that required for both encoder and decoder is generally a generator matrix. We proposed a random selection of generators according to a security key to ensure the secrecy of the networks against unauthorized access. Therefore, the conventional channel coding technique is used as a security controller of the network along with its error correcting purpose.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume II
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• pp.695-697
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• 2006

Elshayal $Smart{\copyright}$ software is an almost First Arabian GIS $software{\copyright}$ which completely developed by Arabian developers team and independent of any commercial software package. The software current Features are View and Edit shape files, build new layers, add existing layers, remove layers, swap layers, save layers, set layer data sources, layer properties, zoom in & zoom out, pan, identify, selecting features, invert selection, show data table, data query builder, location query builder, build network, find shortest path, print map, save map image, copy map image to clipboard, save project map, edit move vertex, edit move features, snap vertexes, set vertex XY, move settings, converting coordinate system, applying VB script, copy selected features to another layer, move selected features to another layer, delete selected features, edit data table, modify table structure, edit map features, drawing new features, GPS tracking, 3D view, etc... The software expected Features are: Viewing raster image and image geo-referencing, read other map formats such as DXF Format and Tiger Line Format.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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• pp.155-157
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• 2005

We propose a new category of hybrid multi-layer neural networks with hetero nodes such as Fuzzy Set based Polynomial Neurons (FSPNs) and Polynomial Neurons (PNs). These networks are based on a genetically optimized multi-layer perceptron. We develop a comprehensive design methodology involving mechanisms of genetic optimization and genetic algorithms, in particular. The augmented genetically optimized HFPNN (namely gHFPNN) results in a structurally optimized structure and comes with a higher level of flexibility in comparison to the one we encounter in the conventional HFPNN. The GA-based design procedure being applied at each layer of HFPNN leads to the selection of preferred nodes (FPNs or PNs) available within the HFPNN. In the sequel, two general optimization mechanisms are explored. First, the structural optimization is realized via GAs whereas the ensuing detailed parametric optimization is carried out in the setting of a standard least square method-based learning. The performance of the gHFPNNs quantified through experimentation where we use a number of modeling benchmarks-synthetic and experimental data already experimented with in fuzzy or neurofuzzy modeling.

• 플랜트 저널
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• 제6권4호
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• pp.63-71
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• 2010

The best way to prevent the corrosion of piston rod is a selection of quality of the material and method of construction which minimize the porosity. The high velocity oxy fuel(HVOF) method, which generates lower porosity than existing plasma spray, was applied to ceramic laminated bond layer. Porosity percentage fell to bellow 2%, lower than that of plasma spray at 7%. Coating material of ceramic-coated main layer was selected as the $Cr_2O_3$ affiliation material, which is more dense than $Al_2O_3$ affiliation. To fill up the pores formed after the coating process, we sealed the bond layer and main layer. Sealing process was performed twice, once after the coating and once after the grinding. Upon the anti-corrosion test on the sealed sample and on the non-sealed sample, it is confirmed that the sealed sample was not corroded for 1,000 hours while the non-sealed sample was corroded within 48 hours.