• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2010.03b
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• pp.39-39
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• 2010

낮은 에너지를 이용하여 상대론적 영역에서 동작하는 마이크로파 출력장치를 연구하였다 그에 따른 후진파 발진기는 대전력 마이크로파를 발생시키는 장치로서 연구하였으며 관내에 전자빔을 입사시킴으로서 발진이 일어나 출력을 발생 시킨다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2009.10a
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• pp.395-396
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• 2009

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2011.04a
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• pp.801-803
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• 2011

• Proceedings of the Korean Society For Composite Materials Conference
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• 2001.05a
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• pp.159-162
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• 2001

A combined finite element and experimental study based on the characteristic length method is performed to investigate the strength and behavior of the pin joint in composite control rod. The failure is estimated by the Yamada-Sun and Tsai-Wu criteria on the characteristic curve. The gap elements are used to simulate the contact between the pin and the composite fitting with hole. The accuracy and applicability of the method are validated by the joint tests. All the specimens were failed in the bearing mode in the test and finite element analysis, and good agreement was found between the predicted and test results on the joint strength of composite control rod.

• Journal of the Korean Institute of Telematics and Electronics A
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• v.32A no.9
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• pp.1250-1256
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• 1995

In this paper, shielded suspended coplanar waveguide with multiple anisotropic substrates is analyzed by the point matching method in the quasi-TEM mode appoximation. The characteristic impedance and the effective dielectric constant are calculated by varying the width of center strip and gap between the center strip and the ground strip. And also the characteristic parameters are calculated as a function of ${\varepsilon}_{x}/{\varepsilon}_{y}$) and a permitivity of the support substrate. Approaching the ground strip to infinity, the values of the characteristic parameters are found to be in good agreement with the other results by variational method.

• Journal of the Korea Fashion and Costume Design Association
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• v.4 no.2
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• pp.85-102
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• 2002

This research surveys the forming process of Practical Korean Costume and its social factors and examines Hanbok reformation. The international mode of '86 Seoul Asian Games and '88 Seoul Olympic Games in the 1980's called for the modernization of Hanbok. It is necessary for us to inherit modernized Hanbok which is endowed with the traditional beauty. The purpose of this research is to develop Practical Korean Costume design for focused on functionality as well as on keeping the traditional beauty This study consist of theoretical study and positive study. Theoretical study has the esthetic characteristics(structure characteristic, formative characteristic and the characteristic of color). Grounded upon survey on brands, I have suggested designs that maintain Hanbok's superiority and functionality to fit modern life. Most of Practical Korean Costume shops could not fractionalize customer. So it need to subdivide and specialize customer and investment to improvement of design. Practical Korean Costume will have to be made to maintain dignity by using high quality materials and a coordinate goods will have to be developed.

• Journal of Korean Society of Transportation
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• v.28 no.3
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• pp.99-107
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• 2010

Analyzing mode choice among transportation demand estimate procedures is complicated and understanding characteristics of travelers is also difficult. Generally, it is well known that traveler choose mode considering psychometric factors and characteristic besides socio-demographic indicators. Accordingly, many researches has investigated on methodology that can be applied in mode choice to reflect psychometric factor or specific preference. Latent Class Analysis among various studies is recognized as the theoretically potential approach. This study focuses on class segmented using latent class cluster to analyze impact that included psychometric factors and characteristics on mode choice. It also provides evidence that mode choice model for each class and mode choice model not considering latent class are different. This study based on citizen's stated preference and revealed preference on a new transit on the Han river shows that latent class cluster analysis is the potential approach considering latent preference.

• Nuclear Engineering and Technology
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• v.52 no.7
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• pp.1532-1536
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• 2020

For ensuring nuclear safeguards, we report the analytical signal-detection performance of thermal ionization mass spectrometry (TIMS) with continuous heating for the measurement of isotopic ratios in samples containing ultra-trace amounts of uranium. As methods for detecting uranium signals, peak-jumping mode using a single detector and static mode using multiple detectors were examined with U100 (10% ²³⁵U-enriched) uranium standard samples in the femtogram-to-picogram range. Uranium isotope ratios, n(²³⁵U)/n(²³⁸U), were measured down to levels of 1 fg and 3 fg in static and peak-jumping modes, respectively, while n(²³⁴U)/n(²³⁸U) and n(²³⁶U)/n(²³⁸U) values were measured down to levels of 100 fg in both modes. In addition, the dependency of the ²³⁸U signal intensity on sample quantity exhibited similar tendencies in both modes. The precisions of the isotope ratios obtained in the static mode over all sample ranges used in this study were overall slightly higher than those obtained in peak-jumping mode. These results indicate that isotope ratio measurements by TIMS with continuous heating are almost independent of the detection method, i.e., peak-jumping mode or static mode, which is characteristic of isotope-ratio measurements using the TIMS method with continuous heating. TIMS with continuous heating is advantageous as it exhibits the properties of multiple detectors within a single detector, and is expected to be used in various fields in addition to ensuring nuclear safeguards.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.45 no.1
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• pp.78-84
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• 2008

In this paper, the reconfigurable annular ring slot antenna with circular polarization diversity is proposed for SDMB(Satellite Digital Multimedia Broadcasting) system. The proposed antenna consists of a ring slot with four tuning stubs. Four PIN diodes are attached to switch circular polarization diversity. By switching the diodes ON or OFF, the proposed antenna can be operated either RHCP mode or LHCP mode. The experimental result shows that the proposed antenna has an impedance bandwidth(VSWR${\leq}$2) of 570MHz(2.47-3.04GHz) at LHCP mode, an impedance bandwidth (VSWR${\leq}$2) of 560MHz(2.45-3.01GHz) at RHCP mode, a maximum gai of 3.1dBi at RHCP mode, 4.76dBi at LHCP mode. The 3dB CP bandwidth of about 100MHz at both RHCP and LHCP mode is achieved at the center frequency 2.63GHz. The proposed antenna is suitable for application such as mobile satellite communications, WLAN(Wireless Local Area Networks), and broadband wireless communication systems.

• Journal of the Institute of Electronics and Information Engineers
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• v.53 no.10
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• pp.109-115
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• 2016

In this paper, In this paper, we use two methods to compare the slim speakers. That way, the diaphragm scan using laser and diaphragm photographed using a thermal imaging camera. Slim speaker has the structure of a flat plate type. Break-up mode by this characteristic is displayed in a larger size. Further, since the installation space is narrow, it has limited moving coil cooling. As a result, the break-up mode slim speakers, a significant impact on quality. In this study, try to connect the break-up mode of the diaphragm, the heat transfer mode of the diaphragm. Experiment for comparison, a two-step. The first step is to measure the divided vibration through the vibration plate scan. The second step measures the diaphragm photographed using a thermal imaging camera. Then, compare the results of both of the same frequency. Thus, comparing the heat transfer pattern and the pattern of break-up mode. Tend to be analysis of break-up mode from the pattern comparison, and document for the optimum design.