• 한국전기전자재료학회논문지
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• 제27권8호
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• pp.522-527
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• 2014

In this study, using the silicone rubber sample of $4cm{\times}4cm{\times}0.1cm$ for low voltage cable, the electrostatic electrification properties of three samples that the conductive Al of 0%, 25%, and 50% is attached to the surface of sample was measured. The following conclusion was obtained through this experiment. 1) In case of the sample which has the Al area of 50%, the higher the humidity to 90% in the temperature of $10^{\circ}C$, the electrostatic electrification voltage was reduced about 0.25 kV to 0.02 kV, and it confirmed that the electrostatic electrification voltage was in constant about 0.02 kV in the temperature over $20^{\circ}C$. 2) Increasing the Al area of samples of 0%, 25%, and 50% in temperature of $10^{\circ}C$, it confirmed that the electrostatic electrification voltage was reduced by about 2.67 kV, 2.02 k, 0.21 kV. 3) This study shows that the conductor, followed by temperature and humidity affects the electrostatic electrification voltage.

• Asian-Australasian Journal of Animal Sciences
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• 제27권9호
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• pp.1328-1335
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• 2014

Significant SNPs associated with Warner-Bratzler (WB) shear force and sensory traits were confirmed for Hanwoo beef (Korean cattle). A Bonferroni-corrected genome-wide significant association (p< $1.3{\times}10^{-6}$) was detected with only one single nucleotide polymorphism (SNP) on chromosome 5 for WB shear force. A slightly higher number of SNPs was significantly (p<0.001) associated with WB shear force than with other sensory traits. Further, 50, 25, 29, and 34 SNPs were significantly associated with WB shear force, tenderness, juiciness, and flavor likeness, respectively. The SNPs between p = 0.001 and p = 0.0001 thresholds explained 3% to 9% of the phenotypic variance, while the most significant SNPs accounted for 7% to 12% of the phenotypic variance. In conclusion, because WB shear force and sensory evaluation were moderately affected by a few loci and minimally affected by other loci, further studies are required by using a large sample size and high marker density.

• 한국가구학회지
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• 제19권3호
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• pp.211-218
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• 2008

This experiment was carried out to investigate the effect of internal holes on the bending strength of PB. The diameters of holes are 0mm to 13mm. The locations of holes are 1/8 to 4/5 point horizontally from sample end and are 1/5 to 4/5 vertically from sample surface, the numbers of holes are 1 to 4 pcs. In the size of internal holes, the bending strengths of PB were decreased significantly with the increase of diameter of holes, and the relationship between diameters(D) of holes and bending strength (${\sigma}_b$) of PB was ${\sigma}_b=-11D+168.8$ ($r^2=-0.99^{**}$). The effects of hole-locations and hole-numbers on the bending strengths of PB were large. and so they should be considered as major factors for the jointing design of PB.

• 한국환경보건학회지
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• 제30권5호
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• pp.427-431
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• 2004

The calcination characteristics of the waste Corbicula Japonica and Ostrea virginjca shell were examined for the future use as desulfurization sorbent. The weight variation was measured according to thermal-decomposition using TGA and observed variation of the phase. The qualitative and quantitative analysis of the sample were performed using XRD and the structural analysis, SEM. The results of TGA and XRD experiments showed that the almost all of the raw samples Corbicula Japonica and Ostrea virginjca were changed from calcite to lime by firing and calcination reaction. The result of SEM experiment showed that the plate type of the raw sample was changed to circle type, so the surface area ratio was increased. Above results suggested that waste Corbicula Japonica and Ostrea virginjca were usable in the viewpoint of the reuse of resource and the decrease of environmental pollution.

• 한국의류학회지
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• 제23권7호
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• pp.998-1006
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• 1999

This study has investigated the relation between the sewing speed and seam breaking strength applied perpendicular to the seam direction. Breaking strength efficiency breaking mode of seams were examined under various sewing conditions using three kinds of sewing threads and four kinds of fabrics. The results obtained are as follows : 1. According to the increase in sewing speed seam strength was remarkably decreased. Seam strength and its loss difference were shown variously as threads and fabrics were mixed. 2. In case of fabrics with higher strength seam strength showed higher. And the seam strength was determined by the loop strength. 3. In case of fabrics with lower strength seam strength and its difference for every sample showed lower. So the strength of fabrics dominated the seam strength than those of threads. 4. In the experiment using various fabrics and sewing threads there was a type of thread appropriate to each fabric. Fabrics and threads with have similar physical properties were shown proper seam efficiency. 5. The breaking mode was different for every sample seam that was tested.

• Wind and Structures
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• 제15권3호
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• pp.223-245
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• 2012

Multivariate simulation is necessary for cases where non-Gaussian processes at spatially distributed locations are desired. A simulation algorithm to generate non-Gaussian wind pressure fields is proposed. Gaussian sample fields are generated based on the spectral representation method using wavelet transforms method and then mapped into non-Gaussian sample fields with the aid of a CDF mapping transformation technique. To illustrate the procedure, this approach is applied to experimental results obtained from wind tunnel tests on the domes. A multivariate Gaussian simulation technique is developed and then extended to multivariate non-Gaussian simulation using the CDF mapping technique. It is proposed to develop a new wavelet-based CDF mapping technique for simulation of multivariate non-Gaussian wind pressure process. The efficiency of the proposed methodology for the non-Gaussian nature of pressure fluctuations on separated flow regions of different rise-span ratios of domes is also discussed.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2001년도 하계학술대회 논문집
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• pp.878-881
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• 2001

In this paper, we analyzed the characteristics of insulating material with ELB(earth leakage circuit breaker) through tracking experiment and the study was carried out three different types of samples. The tracking is breakdown phenomenon of material surface that is generated on the organic insulating material. The test method applied IEC publication 587. The result of the sample breakdown by tracking was carbonized and resistance of between the electrodes is approximately 300$\Omega$. In the result of DSC analysis, the caloric peak was detected before 100$^{\circ}C$ in product of tracking. It appeared weight loss of 10.87% at 537$^{\circ}C$ on TGA. IR spectrum analysis showed carbon-hydrogen(C-H)bond on molecular structure that is the sample of tracking.

• E2M - 전기 전자와 첨단 소재
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• 제8권4호
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• pp.418-425
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• 1995

The surface of GaAs was treated by using the 0.1M solution of N $a_{2}$S.9 $H_{2}$O. The passivation of the surface in this sample was investigated by the photoreflectance(PR) experiment. The surface electric field( $E_{s}$) and built-in voltage( $V_{bi}$ ) discussed from Franz-Keldysh oscillation of PR signals. The density of surface states and Fermi level of GaAs treated with N $a_{2}$S.9 $H_{2}$O for 40min were determined 1.61*10$^{12}$ c $m^{-2}$ and 0.73eV. These values were about 15 and 10% smaller than those in untreated sample.e.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제54권2호
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• pp.51-54
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• 2005

In this work, the attempt has been made to investigate the morphology of self-assembled dipyridinium dithioacetate on Au(111) substrate by Scanning Tunneling Microscopy(STM). Also, we measured electrical properties(I-V) using Scanning Tunneling Spectroscopy(STS). Sample used in this experiment is dipyridinium dithioacetate, which contains thiol functional group, this structure that can be self-assembled easily to Au(111) substrate. The self-assembly procedure was used for two different concentrations, 0.5 mM/ml and 1 mM/ml. Dilute density of sample by 0.5 mM/ml, 1 mM/ml and observed dipyridinium dithioacetate's image by STM after self-assembled on Au(111) substrate. The structure of STM tip-SAMs-Au(111) substrate has been used measurement for electrical properties(I-V) using STS. The current-voltage(I-V) measurement result, observed negative differential resistance(NDR) properties.

• 한국세라믹학회지
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• 제14권2호
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• pp.82-87
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• 1977

The material used in this experiment is Ha-Dong kaolin whichis composed of almost crystallographically pure meta-halloysite. It was grinded and passed through 250 mesh and 325 mesh. It was treated with oxalic acids and EDTA which are different in concentration. The samples in conical beaker were kept in laboratory incubator at $25^{\circ}C$ for a certain hours. The treated samples were stirred twice a day. The sample in the conditions as A-7 was kept in an autoclave under the pressure of 3 atmospheric. The samples suspended in each solution were kept for 1.5, 3 and 6 months. The transformation of crystals was detected by X-ray spectrometer, electron microscopy, and infrared spectrometer. The sample through 325 mesh compared with one through 250 mesh was transformed much more. It took for 6 months to transfer from halloysite to kaolinite in EDTA, and 3~4 months under 3 atms in autoclave at the same condition. In oxalic acids it took more than 6 months.