66 research outputs found
๋จ์ผ์์ธก์ ์ด์์ ์ค๊ณ ํ๋ผ๋ฏธํฐ์ ๋จ์ํ๋ ์ ์ ๊ธฐ์ค์ ๊ดํ ์ฐ๊ตฌ
ํ์๋
ผ๋ฌธ(์์ฌ)--์์ธ๋ํ๊ต ๋ํ์ :ํํ๊ณตํ๊ณผ,1996.Maste
Performance Analysis on Coexistence of LAA and WiFi
ํ์๋
ผ๋ฌธ (์์ฌ)-- ์์ธ๋ํ๊ต ๋ํ์ : ๊ณต๊ณผ๋ํ ์ ๊ธฐยท์ ๋ณด๊ณตํ๋ถ, 2018. 8. ์ต์ฑํ.๋ณธ ๋
ผ๋ฌธ์์๋ LAA์ WiFi ๊ณต์กด ์๋ฎฌ๋ ์ดํฐ๋ฅผ ์์ฑํ ๋ฐฉ๋ฒ๊ณผ ์๋ฎฌ๋ ์ดํฐ๋ฅผ ํ์ฉํ์ฌ LAA์ WiFi ๊ณต์กด ์ฑ๋ฅ์ ํ์ธํ ๊ฒ์ ๋ค๋ฃฌ๋ค. ์์คํ
๋ ๋ฒจ ํต์ ์๋ฎฌ๋ ์ดํฐ์ธ ns-3์ LTE ๋ชจ๋ ์ฝ๋๋ฅผ ๊ธฐ๋ฐ์ผ๋ก 3GPP release 13์ ํ์ค ๋์์ ์งํค๋ LAA ๋ชจ๋์ ์์ฑํ์์ผ๋ฉฐ, ๊ธฐ์กด ns-3์์ LTE์ WiFi ์ฑ๋์ด ๋
๋ฆฝ์ ์ผ๋ก ๊ตฌํ๋์ด ์์์ผ๋ ์ด๋ฅผ ์์ ํ์ฌ ๋น๋ฉดํ๋์ญ์์ LAA์ WiFi๊ฐ ํต์ ๊ฐ์ญ์ด ์์ ์ ์๋๋ก ๊ตฌํํ์๋ค. LAA์ WiFi ๊ณต์กด ์ฑ๋ฅ ํ์ธ์ ์ํด LAA์ ์๋์ง ๊ฐ์ง ์๊ณ๊ฐ์ ํ์ค๊ณผ ๋ค๋ฅด๊ฒ ์ค์ ํ๋ฉฐ ์ด๋ค ์ํฅ์ด ์๋์ง ์คํํ์์ผ๋ฉฐ, ๊ทธ ๊ฒฐ๊ณผ ํ์ฌ LAA ์๋์ง ๊ฐ์ง ์๊ณ๊ฐ์ด WiFi์ ์๋์ง ๊ฐ์ง ์๊ณ๊ฐ๊ณผ๋ ์์ดํ์ฌ ๋น๋์นญ์ ์ธ ํ๋ ๋ฌธ์ ๊ฐ ๋ฐ์ํ๋ ๊ฒ์ ํ์ธํ์๋ค. LAA์ WiFi๊ฐ ์ฑ๋ ์ ์ ๋ฐฉ์์ ๋น์ทํ์ง๋ง, ๊ทผ๋ณธ์ ์ธ ํต์ ๋ฐฉ์์ด ์๋ก ๋ฌ๋ผ ์ ํต์ ์ธ ๋น๋์นญ์ ์ธ ํ๋ ์ํฉ์์ ๋ฐ์ํ๋ ๋ฌธ์ ์ธ์๋ ๋ค๋ฅธ ํ์์ด ์๋ ์ ์ ๋ฐ๊ฒฌํ์์ผ๋ฉฐ ์ด ์ ์ ๋ณธ ๋
ผ๋ฌธ์์ ์์ธํ ๋ค๋ฃจ์๋ค.์ 1 ์ฅ ์ ๋ก 1
์ 2 ์ฅ LAA์ ๋์ ๋ฐฉ์ 2
์ 1 ์ ์ฑ๋ ์ ์ ๋ฐฉ์ 2
์ 2 ์ ๊ฒฝ์ ์๋์ฐ ์กฐ์ 3
์ 3 ์ ๋ฌด์ ๋ ์ฑ๋ ๊ฐ์ง ๊ธฐ๋ฅ 3
์ 4 ์ ๋ค์ ๋ฐ์กํ ์ ์ก ์ ์ฑ๋ ์ ์ ๋ฐฉ์ 4
์ 3 ์ฅ LAA์ WiFi ๊ณต์กด ์๋ฎฌ๋ ์ดํฐ์ ๊ตฌํ 6
์ 1 ์ ๊ธฐ์กด ns-3์ ๋ฌธ์ ์ 6
์ 2 ์ ์ฑ๋ ๋ชจ๋ธ 6
์ 3 ์ LAA์ ๋งค์ฒด ์ ๊ทผ ์ ์ด ๋ชจ๋ธ 7
์ 4 ์ LAA์ ๋ฌผ๋ฆฌ ๊ณ์ธต ๋ชจ๋ธ 8
์ 5 ์ LAA ๋ชจ๋์ ๊ตฌํ 8
์ 6 ์ WiFi ๋ชจ๋์ ๊ตฌํ 12
์ 4 ์ฅ LAA์ ๋ค์ ์ฑ๋ ์ ์ ๋ฐฉ์์ ๋ฐ๋ฅธ ์ฑ๋ฅ ๋ถ์ 13
์ 1 ์ LAA ๋จ์ผ ๋งํฌ ๋ถ์ 13
์ 2 ์ LAA์ WiFi ๊ณต์กด ์ฑ๋ฅ ๋ถ์ 15
์ 3 ์ LAA๊ฐ ์ฑ๋ ์ ์ ๋ฐฉ์์ ๋ฐ๋ฅธ ๊ณต์กด ์ฑ๋ฅ ๋ถ์ 19
์ 5 ์ฅ LAA์ ์๋์ง ๊ฐ์ง ์๊ณ๊ฐ ๋ณํ์ ๋ฐ๋ฅธ WiFi์์ ๊ณต์กด ์ฑ๋ฅ ๋ถ์ 23
์ 1 ์ ์คํ ํ๊ฒฝ 23
์ 2 ์ WiFi ๋คํธ์ํฌ๋ ํญ์ ์ ์ก์ ์ฑ๊ณตํ๋ ํ๊ฒฝ 24
์ 3 ์ LAA ๋คํธ์ํฌ๋ ํญ์ ์ ์ก์ ์ฑ๊ณตํ๋ ํ๊ฒฝ 34
์ 6 ์ฅ ๊ฒฐ๋ก 43
์ฐธ๊ณ ๋ฌธํ 44
Abstract 45
๊ฐ์ฌ์ ๊ธ 46Maste
Oral health status and dental treatment need of liver transplant candidates
ํ์๋
ผ๋ฌธ(์์ฌ) --์์ธ๋ํ๊ต ๋ํ์ :์น์ํ๊ณผ, 2009.2.Maste
Professional Degree System in Institutions of Higher Education
๋ณธ ์ฐ๊ตฌ์์๋ ์ฐ๋ฆฌ๋๋ผ ๊ณ ๋ฑ๊ต์ก ํ์ ์ทจ๋์๋ค์ด ์
์ง๊ต์ก ํ ์ง์
์ธ๊ณ๋ก ์ํํ๊ฒ ์ดํํ๋๋ก ๊ณ ๋ฑ์ง์
๊ต์ก ํ์์ ๋๋ฅผ ์ฒด๊ณ์ ์ผ๋ก ์ ๋นํ๊ธฐ ์ํ ๊ธฐ์ด ์์
์ ํ๊ณ ์ ํ์๋ค. ์ด๋ฅผ ์ํ ์ธ๋ถ์ ์ธ ์์
์ ๋ค์๊ณผ ๊ฐ๋ค.
์ฒซ์งธ, ์ฐ๋ฆฌ๋๋ผ ๊ณ ๋ฑํ์์ ๋๋ฅผ ์ง์
๊ต์ก์ ๊ด์ ์์ ์กฐ๋งํ๊ณ ,
๋์งธ, ์ฐ๋ฆฌ๋๋ผ ์ง์
ํ์์ ๋์ ๋ฌธ์ ์ ์ ๊ท๋ช
ํ๋ฉฐ,
์
์งธ, ์ ์ง ์ธ๊ตญ์ ์ง์
ํ์์ ๋๋ฅผ ์ฐ๋ฆฌ๋๋ผ์ ๋น๊ตํ์ฌ ์์ฌ์ ์ ์ ์ํ๊ณ ,
๋ท์งธ, ์ฐ๋ฆฌ๋๋ผ์ ์๋ก์ด ์ง์
ํ์์ ๋ ๊ตฌ์ถ์ ์ํ ๋ฐฉํฅ์ ์ ์ํ๋ค.In the Korean higher education, degrees themselves are not considered an effective and meaningful means to employment, although some great emphasis has been placed on academic-industrial cooperation and vocational education. The vocational education for employment is largely limited to the programs offered in specialized high schools and junior colleges. At the level of bachelor degrees and above, higher education does not have any explicit or systematic recognition of vocational education, thus failing to develop vocational or professional degrees in distinction from traditional academic degrees. In these circumstances in which laws and regulations concerning vocational education are accordingly not properly provided, individual universities are helplessly left with the highly challenging task of a successful transition from higher education to the labor market.
It is the business of this research to lay foundation for the establishment of โhigher education professional degree systemโ in Korea that enables a smooth transition from higher education to the labor market. For this purpose, this research conducts the international comparative study of five nations (Korea, the UK, the US, France, and Japan), which consists of a simple comparison and an in-depth comparison of the five nations. Seven categories are prepared for the simple comparison; (1) higher education system, (2) laws concerning higher education degrees, (3) national qualifications system, (4) academic degrees and professional degrees, (5) conditions for professional degrees, (6) quality control system of professional degrees, (7) recent policies concerning professional degrees. And under the seven categories fifteen items are developed for a detail comparison.
For the in-depth comparison which intends to give a systematic explanation of the main differences among the professional degrees systems of the five nations, three levels of analysis (surface, middle, foundation levels) are suggested. The surface level analysis is concerned with the extent to which a higher education system is oriented towards traditional academic degrees programs or professional degrees programs. The middle level analysis is about the overarching aim of higher education, the proposition of private higher education institutions to public ones, the market-orientedness of higher education, the youth unemployment, the professionalization policy, the market values of professional degrees, the social trust in professional degrees, the internalization, and so forth. And at the foundation level, the analysis focuses on two factors that subtlely yet significantly result in a distinctive higher education system of a nation. It is shown that each nationโs higher education system has been developed in its own way, depending both on different modes of family system open to the young people who have begun studies at higher education institutions, and on different modes of social security system.
The comparison helps identify two contrasting models of higher education professional degrees system, which can be found typically in France and the US. The French model is one that fully acknowledges the social and market values of professional degrees and thus systematically arranges professional degrees programs for the all levels of higher education whereas the American model is one in which professional degrees themselves are not greatly valued and required in the market. These two models are taken as two possible scenarios for the development of the Korean higher education system, and three steps to go through are provided for the completion of what is suggested in each scenario.์ ์ฝ
์ 1์ฅ ์ ๋ก 1
์ 1์ ์ฐ๊ตฌ์ ํ์์ฑ๊ณผ ๋ชฉ์ 3
์ 2์ ์ฐ๊ตฌ ๋ฐฉ๋ฒ 7
์ 2์ฅ ํ๊ตญ์ ๊ณ ๋ฑ์ง์
ํ์์ ๋์ ๋ฌธ์ 15
์ 1์ ์ ๋ 17
์ 2์ ๋ฌธ์ ์ 63
์ 3์ฅ ์ธ๊ตญ์ ์ฌ๋ก ๋ถ์ 65
์ 1์ ์๊ตญ 67
์ 2์ ๋ฏธ๊ตญ 115
์ 3์ ํ๋์ค 145
์ 4์ ์ผ๋ณธ 183
์ 4์ฅ ๋น ๊ต 243
์ 1์ ๊ณ ๋ฑ์ง์
ํ์์ ๋ ๋น๊ต 245
์ 2์ ๊ตญ๊ฐ ๊ฐ ์ ๋ ์ฐจ์ด ์ค๋ช
251
์ 5์ฅ ๊ฒฐ ๋ก 259
SUMMARY 271
์ฐธ๊ณ ๋ฌธํ 27
Fluorescence features of Tm3+-doped multicomponent borosilicate and borotellurite glasses for blue laser and S-band optical amplifier applications
Novel B2O3-SiO2-Al2O3-ZnO-Li2O/MgO and B2O3-TeO2-PbO-ZnO-Li2O-Na2O glasses with different concentrations of Tm2O3 were synthesized by using the melt-quench method. All the fabricated samples have been characterized by visible emission spectra and decay times, including near-infrared (NIR) luminescence measurements. For 0.5 mol% Tm3+-doped borotellurite glass, several radiative parameters are evaluated using the Judd-Ofelt parameters. The intensity of all the visible emission bands increased with the increase of Tm2O3 concentration up to 0.5 mol%, and beyond this doping content, luminescence concentration quenching takes place. The luminescence intensity quenching is attributed to energy transfer (ET) processes through cross-relaxation (CR) channels. The visible luminescence decay curves were well fit with a single exponential (for Tm3+: D-1(2) level) and double exponential (for Tm3+: (1)G(4) level) functions for the multicomponent borosilicate samples, while Inokuti-Hirayama model was used for the multicomponent borotellurite glass D-1(2) level decay time fit. The derived decay lifetimes of the D-1(2) level are found to be much shorter than that of the (1)G(4) level. In Li2O (alkali) or MgO (alkaline) containing borosilicate samples, pumped under 808 nm laser diode, the H-3(4) -ห F-3(4) (1.458 mu m) emission intensity increased from 0.1 to 2.0 mol% Tm3+ ion concentration, indicating negligible CR processes. The computed Full-Width at Half-Maximum (FWHM) values for the 1458 nm emission in 2.0 mol% Tm3+-doped Li and Mg series borosilicate samples are 117 and 125 nm, respectively, while the FWHM value for 0.5 mol% Tm2O3 content doped borotellurite glass is 118 nm. Following the analyzed visible and NIR optical results, the fabricated Tm3+ glasses could be useful for blue laser and S-band optical amplifier applications.This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. NRF2018R1A5A1025137). The author G.L.N would like to acknowledge the use of the facilities of Universiti Putra Malaysia (UPM), Malaysia. The author (A. Dahshan) gratefully thank the Deanship of Scientific Research at King Khalid University for financial support through research groups program under grant number (R.G.P.2/34/40)
Luminescence properties of reddish orange emitting BaLa2ZnO5:Sm3+ phosphor prepared by citric based sol-gel synthesis
A series of BaLa2ZnO5:Sm3+ phosphors were synthesized with the sol-gel technique. The crystalline structure of each sample was characterized by X-ray diffraction (XRD). Phase formation was investigated using scanning electron microscope (SEM). Photoluminescence studies revealed an efficient excitation of phosphors at near blue light (similar to 410 nm), providing emission in the bright reddish-orange region (603 nm). Concentration quenching through multipolar interaction was observed in BaLa2ZnO5 phosphor system doped with 0.015 mol of Sm3+ concentration. The optimum phosphor showed prominent characteristics for application in white LEDs.This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (2018M2B2A9065656)
์ ์ฒด์ธํ์ ์ผ์ฐจ๊ณก ๊ฐ๊ณต์ ์ํ ๊ฐ๊ณต์ ๋ณด ๊ฒฐ์
Thesis (master`s)--์์ธ๋ํ๊ต ๋ํ์ :์กฐ์ ํด์๊ณตํ๊ณผ,1997.Maste
Internal Reconfigurable Dipole–Loop Antenna Array for High Reception Rate of Wideband UHD-TV Applications
An internal reconfigurable Dipole–Loop antenna array, covering the entire ultra-high frequency (UHF) band for ultra-high definition television (UHD-TV) applications is presented. The internal antenna array is used to overcome the influence of electromagnetic interference when integrating the antenna element inside the TV model and to increase the gain and reception rate of receiving signals for television broadcasting. The antenna array is designed based on the Dipole–Loop antenna elements, placing on substrate material PC-ABS (polycarbonate-acrylonitrile butadiene styrene: εr = 3.5, tan δ = 0.005) of the bezel frame in the TV model. By simultaneously switching PIN diodes with two ON/OFF states, the antenna array can be frequency reconfigured to achieve a wide operating bandwidth for UHF (470–771 MHz) band. The spacing between the antenna elements in the array at each mode is chosen as 0.5λ0 (λ0 represents the free space wavelength of the highest frequency in the operating band). The proposed antenna array is designed, fabricated, and tested for experimental verification. Measurement results show that the antenna array is good for high reception rate of UHD-TV applications, with a − 6 dB impedance bandwidth of 51.6% (460โ780 MHz), covering the whole UHF band. The 3 dB gain bandwidths of 42.5% and 54.6% are obtained with peak realized gains of 9.6 dBi and 8.5 dBi for the horizontal and vertical polarizations, respectively. In addition, the diversity performance parameters are obtained and evaluated using the mean effective gains of the elements, and the diversity gain using both simulation and measurement results. It shows that the proposed antenna array can receive multi-side signals, applied in diversity and MIMO systems.This work was supported by the Research Fund of Hanyang University under Grant HY-2015-G
๋ ์๋ฉด ์์กด์ฑ ํ์์ฑ ์๋ฉด ๋ฌดํธํก์ฆ ์ฌ์ ํ์๊ตฐ์ ๋ํ ๋น๊ต ์ฐ๊ตฌ
ํ์๋
ผ๋ฌธ(์์ฌ) --์์ธ๋ํ๊ต ๋ํ์ :์ํ๊ณผ ์ ์ ๊ณผํ,2008.2.Maste
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