• International Journal of Computer Science & Network Security
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• v.21 no.6
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• pp.143-150
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• 2021

Process model is an integral part of software industry. Different process models are used now a days in the industry for different software projects. Process models need to be tailored to address some specific project needs. Agile models are considered as the most widely used process models nowadays. They have distinctive features and the ability to address the dynamic needs of today's software development. Extreme programming (XP) is one of the extensively used agile process model especially for small projects. Many researchers have tried to mold XP to overcome its shortcomings and for better working in specific scenarios. Therefore, many customized versions of XP process model are available today. In this paper, we are going to analyze the latest customizations of XP. For this purpose, a systematic literature review is conducted on studies published from 2012 till 2018 in renowned online search libraries. This comprehensive review highlights the purpose of customizations, along with the areas in which customizations are made, and phases & practices which are being customized. This work will serve the researchers to discover the modern versions of XP process model as well as will provide a baseline for future directions for customizations.

• Proceedings of the Korean Vacuum Society Conference
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• 2000.02a
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• pp.169-169
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• 2000

최근 반도체 소자의 초고집적화 현상에 따라 기존의 Al-base 합금에 대한 한계에 달하면서 그에 대한 대체 물질로 Cu가 관심을 모으게 되었고 그럼으로써 Cu metallization을 위한 많은 연구가 진행되어 왔다. Cu는 Al-base 합금계보다 비저항이 낮고, 녹는점이 높으며, 또한 electromigration 특성이 뛰어난 것으로 알려져 있다. 공학적인 면에서 이미 이들 계에 대한 adhesion 및 전기적 특성에 대한 많은 연구가 있어왔지만, 이들 특성 변화에 대한 물리적 의미를 제공할 만한 기초 자료들이 부족한 상태이다. 본 연구에서는 부도체인 polyimide 박막과 diffusion barrier인 TiN 박막위에서의 Cu 박막성장에 따르는 interface chemical reaction의 변화를 XPS를 이용하여 관찰함으로서 이들 계에 있어서의 adhesion과의 관계를 조사하였다. 그리고 XPS를 이용한 modified surface accumulation method를 적용시켜 TiN diffusion barrier를 통한 Cu의 grain boundary diffusion 상수들을 측정하였다. Cu/TiN system의 경우에는 interface chemical reaction이 일어나지 않았지만 Cu/polymide system에 있어서는 boundary diffusivity는 특히 40$0^{\circ}C$에서 $650^{\circ}C$ 영역에서, Db=60$\times$10-11exp[-0.29/(kBT)]cm2/sec 이었다.

• Proceedings of the Korean Vacuum Society Conference
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• 1999.07a
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• pp.207-207
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• 1999

고분자 재료에 이온을 주입함으로서 소재 표면은 경도, 내마모, 내피로성의 기계적인 특성과 내부식성의 화학적 특성, 전기 전도도, 광학적 특성(Optical Density)의 물리적인 특성이 향상된다. 본 논문에서는 MPPO(Modified-Polyphenylene Oxide) 표면에 Ar, N2, He, H 이온을 50, 70, 100 KeV, Dose 1$\times$1014~1$\times$1017 ions/$ extrm{cm}^2$로 조사하였다. XPS와 RBS로 소재의 Binding Energy와 이온의 침투깊이, 분자 조성과 결합 상태 등의 특성을 관찰하였다. 표면 저항값은 1$\times$1011~6.7$\times$106($\Omega$/$\square$)으로 감소함으로서 전기 전도도가 향상되었고, Optical Density는 증가하여 전기적 특성과 광학적 특성간의 상관 관계가 있음을 보여준다.

• Journal of Korea Water Resources Association
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• v.48 no.9
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• pp.729-741
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• 2015

This study examined the applicability of MBLRP (Modified Bartlett-Lewis Rectangular Pulse) rainfall generation model for an urban flood simulation which is a type of Poisson cluster rainfall generation model. This study constructed XP-SWMM model for Namgajwa area of Hongjecheon basin, which is a two-dimensional pipe network-surface flood simulation program and computed a flood discharge and a flooded area with input data of synthetic rainfall time series of 200 years that were generated by the MBLRP model. This study compared the data of flood with synthetic rainfall and flood with corresponding values which were based on design rainfall. The results showed that the flooded area computed with MBLRP model was somewhat smaller than the corresponding values on the basis of the design. A degree of underestimation was from 8% (5 year) to 34% (200 year) and the degree of underestimation increased as a return period increased. This study is meaningful in that it proposes methodology that enables quantifiability of uncertain variables which are related to a flooding through Monte Carlo analysis of urban flooding simulation and applicability and limitations thereof.

• Journal of the Korean Vacuum Society
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• v.6 no.4
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• pp.321-325
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• 1997

Recently, photosensitive color filters have received much attention for their use in the liquid crystal display (LCD) industry. It is well known that chemical and physical properties of polymer surfaces can be modified by special surface treatments. In this work, we have studied the polymer surfaces of LCD blue color filters which were exposed to the UV light during photolithography. A better understanding of the irradiated polymer surfaces is required for the subsequent processes such as plasma etching, ITO electrode deposition, etc. The surface analysis has been undertaken using secondary ion mass spectrometry (SIMS), x-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). A significant enrichment of the pigment component and roughening of surface with bubble-like feature have been observed at the modified polymer surface.

• Journal of the Korean Vacuum Society
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• v.7 no.2
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• pp.112-117
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• 1998

TiN has been investigated as a good candidate for a diffusion barrier of Cu. Therefore, in this study, the grain boundary diffusion of Cu in TiN film was investigated by X-ray photoelectron spectroscopy(XPS). In general, TiN has a columnar grain structure. In the relatively lower temperature, less than 1/3 of the melting point, it was observed that Cu diffused into TiN mainly along the grain boundaries of TiN. The grain size of TiN was measured by atomic force microscope (AFM). In order to estimate the grain boundary diffusion constants, we used the modified surface accumulation method. The activation energy, $Q_b$ was 0.23 eV, and the diffusivity, $D_{bo}$ was $5.5\times10^{-12{\textrm{cm}^2$/sec.

• Restorative Dentistry and Endodontics
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• v.40 no.4
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• pp.255-261
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• 2015

Objectives: The aim of this study was to evaluate the effect of three different drinks on the color parameters of four different restorative materials. Materials and Methods: Three different composites (Filtek Ultimate Universal Restorative, Filtek Ultimate Flowable, and Filtek Silorane, 3M ESPE) and a polyacid-modified composite resin material (Dyract XP, Dentsply DeTrey GmbH) were evaluated. Eighty-four disc-shaped specimens of 8 mm in diameter and 2 mm in thickness were prepared (n = 21 each). Color coordinates ($L^*a^*b^*$, ${\Delta}L^*$, ${\Delta}a^*$, ${\Delta}b^*$, and ${\Delta}E^*$) were measured using a $V{\dot{I}}TA$ Easyshade Compact ($V{\dot{I}}TA$ Zahnfabrik) after 24 hr of storage (baseline) and after 30 day of storage in three different beverages of black tea, Coca cola, or water (control) (n = 7). In each beverage, the specimens were stored three times a day, one hr each, for 30 day. The color changes (${\Delta}E$) were calculated and were analyzed by Kruskal-Wallis and Dunn multiple comparison test. Results: The color difference (${\Delta}E^*$) of the resin materials ranged between 1.31 and 15.28 after 30 day of immersion in the staining solutions. Dyract XP in Coca cola ($15.28{\pm}2.61$) and black tea ($12.22{\pm}2.73$) showed the highest mean ${\Delta}E^*$ value after 30 day, followed by Filtek Ultimate Universal Restorative ($5.99{\pm}1.25$) and Filtek Ultimate Flowable ($4.71{\pm}1.40$) in black tea (p < 0.05). Conclusions: The compomers displayed unacceptable color changes at the end of 30 day in all beverages. Among resin composites, the silorane based composite exhibited relatively good color stability than the others. Filtek Ultimate Universal Restorative and Filtek Flowable showed similar color changes in all beverages.

• Applied Chemistry for Engineering
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• v.21 no.1
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• pp.34-39
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• 2010

Methacryloxypropyltrimethoxysilane (MPTMS) was used for the surface modification of silica nanoparticles in the toluene dispersion system for 8 h (MPSN). Then, methacryloxypropyl-modified silica nanoparticles were successfully prepared by solutioun polymerization in the ethanol solution at $60^{\circ}C$ for 14 h with adding AIBN initiator. The modification of ultra-fine particles (SiOx-PAA nanospheres) was investigated via EA, XPS, FTIR, TGA, SEM and TEM. The mean diameter of the bare silica nanoparticles, MPSN and SiOx-PAA monodisperse nanoparticles was about 25, 30 and 35 nm, respectively.

• Magazine of the Korean Society of Agricultural Engineers
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• v.31 no.2
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• pp.116-124
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• 1989

Based on the theory of runoff equation proposed by SCS, the actual storage capacity(Sa) as a modified retention paramater was introduced to estimate the effective rainfall for the daily streamfiow analysis. During a storm, the actual storage capacity is limited by either soil water storage or infiltration rate as precipitation increases. Therefore, it was assumed that Sa is dependent on the baseflow before storm runoff(Qb) corresponding to soil water storage and the total amount of precipitation(P) corresponding to infiltration rate of a watershed. Effective rainfalls (Direct run-offs) estimate4 from SCS equation using Sa were compared with observed effective rainfalls at 10 watersheds in Geum river watershed boundary. 1. Regression equation for Sa was supposed Sa=Co+C$_1$XP+C$_2$X Qb Regression coefficients were highly significant at the level of 0. 01 and R$^2$ were 0.57 to 0.73. 2. The adjustment of coefficient of initial abstraction was made according to the storm size. It was adjusted to 025 for 30mm or less, 0.23 for 30 to 80mm, 0.20 for 80 to 200mm, and 0.1 for 200mm or more. 3. Regression equations between estimated and observed effective rainfall showed that slopes were 0.857 to 1.029 and R$^2$ were 0.779 to 0.989,

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2015.11a
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• pp.176-177
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• 2015

본 실험에서 PET 위 무전해 구리 도금을 위한 전처리 방법 중 하나인 UV 조사를 통해 전처리를 한 후 PET 표면의 특성과 염기성 무전해 도금액이 개질된 표면에 미치는 영향에 관한 연구를 하였다. 일반적으로 PET 표면을 개질시키기 위해 UVC(254nm) 파장을 이용하여 PET bond break (Chain Scission)을 이루는 것으로 알려진다. 이때 공기 중의 산소와 UV 조사를 통해 생성된 PET 내의 free radical과 산화 반응을 통해 친수성이 높은 표면을 형성하게 된다. PET 표면의 친수성을 측정하기 위해 접촉각 측정기가 사용되었으며, 표면의 거칠기 및 형상을 관찰하기 위해 AFM과 FE-SEM를 각각 이용하였다. 또한 PET 표면의 구조 변화는 XPS를 통해 분석을 진행 하였다. UV 조사 후 표면의 거칠기 및 친수성은 높아졌지만, 무전해 도금은 이루어지지 않았다. 분석 결과, 이는 표면에 형성된 Low Molecular Weight Oxidation Compound(LMWOC)가 염기성 수용액 내에서 용해되어 모두 씻겨 나가 표면에 형성된 Sn/Pd을 모두 떨어트린 것으로 판단되며, 위와같은 이유로 UV 조사 후 습식 공정에 적용하기 위해 표면개질 된 PET를 염기성 수용액을 통해 전처리가 필요한 것으로 사료된다.