• Journal of the Korean Society for Railway
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• v.19 no.2
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• pp.204-212
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• 2016

The soils used as trackbed in Korea are selected using USCS utilizing basic soil properties such as Grain Size Distribution(GSD), % passing of #200 sieve ($P_{200}$), % passing of #4 sieve ($P_4$), Coefficient of uniformity ($C_u$), and Coefficient of curvature ($C_c$). Degree of compaction of the soils adapted in the code by KR should be evaluated by maximum dry density (${\gamma}_{d-max}$) and deformation modulus $E_{v2}$. The most important influencing factor that is critical to stability and deformation of the compacted soils used as trackbed is stiffness. Thus, it is necessary to construct a correlation between the modulus and the basic soil properties of trackbed soil in order to redefine a new soil classification system adaptable only to railway construction. To construct the relationship, basic soil test data is collected as a database, including GSD, maximum dry unit weight (${\gamma}_{d-max}$), OMC, $P_{200}$, $P_4$, $C_u$, $C_c$, etc.; deformation modulus $E_{v2}$ and $E_{vd}$ are obtained independently by performing a Repeated Plated Bearing Test (RPBT) and Light Weight Deflectometer Test (LWDT) for ten different railway construction sites. A linear regression analysis is performed using SPSS to obtain the relationship between the basic soil properties and the deformation modulus $E_{v2}$ and $E_v$. Based on the constructed relationship and the various obtained mechanical test data, a new soil classification system will be proposed later as a guideline for the design and construction of trackbed foundation in Korea.

• Journal of Integrative Natural Science
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• v.4 no.1
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• pp.1-6
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• 2011

The properties of porous silicon, such as substrate properties, porosity, thickness, refractive index, surface area, and optical properties of porous silicon were reviewed. Some properties, such as porosity, refractive index, thickness, pore diameter, multi-structures, and optical properties, are strongly dependent on the anodization process parameters. These parameters include HF concentration, current density, anodization time, and silicon wafer type and resistivity.

• Proceedings of the Korean Vacuum Society Conference
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• 2010.08a
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• pp.168-168
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• 2010

Transparent conduction oxides (TCOs) films is extensively reported for optoelectronic devices application such as touch panels, solar cells, liquid crystal displays (LCDs), and organic light emitting diodes(OLEDs). Among the many TCO film, indium tin oxide(ITO) is in great demand due to the growth of flat panel display industry. However, indium is not only high cost but also its deposits dwindling. Therefore, many studies are being done on the transparent conductive oxides(TCOs). We fabricated a target of IZTO(In2O3:ZnO:SnO2=70:15:15 wt.%) reduced indium. Then, IZTO thin films were deposited on glass substrates by pulsed DC magnetron sputtering with various oxygen flow ratio. The substrate temperature was fixed at the room temperature. We investigated the electrical, optical, structural properties of IZTO thin films. The electrical properties of IZTO thin films were dependent on the oxygen partial pressure. As a result, the most excellent properties of IZTO thin films were obtained at the 3% of oxygen flow rate with the low resistivity of $7.236{\times}10^{-4}{\Omega}cm$. And also the optical properties of IZTO thin films were shown the good transmittance over 80%. These IZTO thin films were used to fabricated organic light emitting diodes(OLEDs) as anode and the device performances studied. The OLED with an IZTO anode deposited at optimized deposition condition showed good brightness properties. Therefore, IZTO has utility value of TCO electrode although it reduced indium and we expect it is possible for the IZTO to apply to flexible display due to the low processing temperature.

• Polymer(Korea)
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• v.37 no.4
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• pp.500-506
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• 2013

The effect of compatibilizer types on the properties of polyphenylene sulfide (PPS)/polyethylene terephthalate (PET) blends was investigated. The blends were extruded by a single screw extruder attached with a Maddock mixing zone and their molded properties were examined. As a basic blend composition, a linear PPS/PET (40/60) blend was selected based on cost efficiency. Three types of compatibilizer, SEBS, modified SEBS, and modified PS were added to the basic blend to improve the properties. The thermal, rheological, mechanical properties and the morphology of the ternary blends were analyzed. The maximum mechanical properties of blends was found at 1 phr of m-SEBS or m-PS content, whose values were almost the same as the theoretical values of miscible blend system. It seemed to by the case that the partial reaction between compatibilizer and the basic blend caused the enhancement of compatibility between linear PPS and PET phases. These ternary blends would be applicable as economic linear PPS alloys.

• Journal of Oriental Neuropsychiatry
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• v.23 no.3
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• pp.33-46
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• 2012

Objectives : Emotion is composed by several basic feelings. This basic feeling is called Chiljung in Oriental Medicine. This study examines the positive and negative affects related to Chiljung. Methods : A total of 199 students of Dongshin university oriental medicine were tested by Questionnaire for Sasang Constitution ClassificationII(QSCCII) and Positive Affect and Negative Affect Schedule(PANAS). This study is used 156 students' data, excluding 43 students' data. Of the enrolled 156 students, four groups were classified by QSCCII. The positive and negative properties of Chiljung were determined by PANAS. These data were analyzed by frequency, Pearson's chi-square test, Crosstabulation Analysis with SPSS windows 15.0. Results : 1. Joy(喜) and Anger(怒) has directly-opposed emotional properties. 2. Thought(思) difficult to tell the difference between positive and negative, but it is distinct from Anxiety(憂) and Sorrow(悲) 3. Anxiety(憂) and Sorrow(悲) are superior in negative emotional properties. 4. Fear(恐) and Fright(驚) are superior in negative emotional properties, and Fright(驚) is superior over Fear(恐) in positive emotional properties. Conclusions : This study may serve as the foundation in identifying the psychological traits of Chiljung.

• The KSFM Journal of Fluid Machinery
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• v.14 no.1
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• pp.34-41
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• 2011

Fire characteristics can be analyzed more realistically by using more accurate properties related to the fire dynamics and one way to acquire these fire properties is to use one of the inverse property estimation techniques. In this study two optimization algorithms which are frequently applied for the inverse heat transfer problems are selected to demonstrate the procedure of obtaining pyrolysis properties of charring material with relatively simple thermal decomposition. Thermal decomposition is occurred at the surface of the charring material heated by receiving the radiative energy from external heat sources and in this process the heat transfer through the charring material is simplified by an unsteady 1-dimensional problem. The basic genetic algorithm(GA) and repulsive particle swarm optimization(RPSO) algorithm are used to find the eight properties of a charring material; thermal conductivity(virgin, char), specific heat(virgin, char), char density, heat of pyrolysis, pre-exponential factor and activation energy by using the surface temperature and mass loss rate history data which are obtained from the calculated experiments. Results show that the RPSO algorithm has better performance in estimating the eight pyrolysis properties than the basic GA for problems considered in this study.

• 한국지구물리탐사학회:학술대회논문집
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• 2007.06a
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• pp.291-296
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• 2007

We measured potential waveform of load, displacement, micro electric signal generated by rock and mortar fracture using PXI A/D Converter. The rock type used for measurement was used granite, limestone and sandstone, and mortar specimen. we made measuring equipment of physical properties to confirm basic information of physical properties, measured physical properties of rock engineering, electric resistivity and seismic velocity. Potential waveform system was built using PXI A/D Converter and measured potential waveform of load, displacement, micro-electric signal generated using this during uniaxial compressive test by the specimen finished such test of physical properties. Using the saturated rock and mortar specimen, micro electric signal increased, and It didn't increase a signal in dried rock and mortar specimen according as load and strain rate increases. But signal also increased in saturated or dried specimen in case of sandstone. It was possible to check the close correlation relationship the signal and fracture behavior by a compressive load as the signal of fracture position was increased bigger than the other position. It was also possible to check the correlation relationship between physical properties and micro geo-electric signal.

• Proceedings of the Korean Vacuum Society Conference
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• 2001.07a
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• pp.54-54
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• 2001

• Journal of Korean Medical classics
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• v.23 no.5
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• pp.117-122
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• 2010

The relationship between river-table and five-type individuals with yin-yang's greater and lesser properties from NeiJingaswellasKoreansasangmedicinewasexplored.1.Rivertableisthetheoreticalbasisforthefive-typeconstitutionswithyin-yang'sgreaterandlesserpropertiesandKoreansasangconstitutions:Thecontentoffour-manifestationconstitutionswithyin-yang'greaterandlesserpropertiesinLingShuTongTian,isrelatedtoChangeBook,andcouldbeexplainedandgeneralizedwithriver-table;itissaidthatKoreansasangconstitutionfoundedbyYiJeMaalsostemmedformLingShuTongTian,butitstheoreticalsystemisdifferentfromthatofLingShuTongTian.Thoughthissystemcanbeexplainedandgeneralizedwithriver-table,itsdistributionofinternalorgansisdifferentfromthatofLingShuTongTian.2.Theclinicalmanifestationsoffour-manifestationconstitutionwithyin-yang'slesserandgreaterprpertiesofTCM,includingpersonality,behaviorpatternandliabilitytocertaindiseases,wereexploredandtheregulatingandcultivatingprinciplesbasedonriver-tabletofour-manifestationconstitutionswithyin-yang'sgreaterandlesserpropertiesalsowereestablished:IndividualsofShaoyang(lesseryang)constitutionshouldpayattentiontoliverqi'sascendinganddispersing,andharmonizationofliveryinandliveryanginspring;individualsofTaiyang(greateryang)constitutionshouldemphasizetheclearinganddescendingofheartqiandharmonizationofheartyinandheartyanginsummer;individualsofShaoyin(lesseryin)constitutionshouldattachimportancetodispersing,purifyinganddescendingoflungqiandharmonizationoflungyinandlungyanginautumn;individualsofTaiyin(greateryin)shouldlaystressonthecultivatingofkidneyqi'sascendingandsteaming,andharmonizationofkidneyyinandkidneyyanginwinter.Besides,individualsofthefourtypesmentionedaboveshouldcultivateandregulateqiofspleenandstomach,fortheascending-descendingandharmonizationofstomachqiandspleenqiisthebasisforthenormalorhealthybodyconstitution,andtheroottoremedythetendenciesoffour-manifestationconstitutions.

• Journal of Magnetics
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• v.11 no.4
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• pp.156-159
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• 2006

We have studied the magnetic properties of the CuNi nanoparticles for three different sizes prepared by plasma and chemical techniques. The magnetization is enormously enhanced with decreasing the nanoparticle size. This enhanced magnetic moment shows almost inversely linear temperature dependence, which could be interpreted by the Langevin-type superparamagnetism. The field dependence exhibits ferromagnetic-like behavior with weak hysteresis, which could described in terms of uncompensated spin and/or surface anisotropy. In addition, the magnetic data suggest that the CuNi nanoparticles produced by the plasma method result in significantly less oxidized metallic nanoparticles than those prepared by other techniques.