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中炭素鋼 熔接部의 熱處理에 따른 機械的 性質에 관한 硏究
李龍福,金柄旭,康仁燦 弘益大學校 1982 弘大論叢 Vol.14 No.2
Strength of the weld zone is influenced by many complicated factors, such as welding conditions, constraint, materials, etc. Especially, Residual Stress plays an important role for mechanical properties in the weld zone. In this paper, the stress relief effect on the residual stress of the weld zone was examined under various annealing treatment. The results obtained are as follows. 1.Tensile strength on welding decreased 5.7%, 11.4% and 15.3% with increased annealing temperature from 650℃ to 850℃. 2.Absorbed lmpact energy increased in turns of Bond Zone, Base Metal, Fusion Zone and H.A.Z(Heat Affected Zone) and decreased with increasing of the annealing temperature 650℃, 850℃. 3.Reisdual Stress on welding was reduced by the ratio of 65%, 82.5%, 90% with the increased annealing temperature from 650℃ to 850℃. 4.It may be concluded that the best result of the annealing was obtained at 650℃.
이석인,조용찬 중앙대학교 스포츠과학연구소 2002 體育硏究 Vol.- No.17
Sport plays an important role as a new generation in media communications and it is able to control our generation. It is also important to build up various sport contents. Sport unite with media and then we regard it as a socially and economically important thing. Sport and Media or television combine. In addition, we should study international technology(IT) in relation to sport. It is worthy to be considered. For example, in the Sydney olympic and World cup, we have realized how high the fee of broadcast. It proves that sport has unlimited perspicacity. Since we connected the sport with the media, we have got a lot of success in this field. The sport would be the most expensive resources in the global village, connecting with data broadcasting and internet broadcasting. No matter how the sport has developed quickly by now, this study would be just first step in the period of digital. In this paper we don’t discuss only sport in the period of digital. There’s something to continue to study in relation to media and broadcast. The purpose of this study is that we will examine and analyse sport which leads the digital, systematically.
평면 다수 입출력 전력 분배/결합회로의 2 GHz에서의 구조 수정 연구
한용인,조치성,김인석 한국항행학회 2002 韓國航行學會論文誌 Vol.6 No.4
본 논문에서는 하나의 입력과 다수의 출력을 가지는 [10]에서에서 제시한 평면 Taper 형의 전력 분배/결합기를 2GHz대역에서 수정한 구조를 제안한다. 제안하는ㄱ n조의 전기적 특성을 결정하는 파라메터들을 HFSS시뮬레이션을 이용하여 분석하였다. 입력 정합 그리고 각 출력 단에서 출력 신호의 균형과 위상의 선형성을 위해 회로의중앙에 하나의 원형 모양을 애칭 제거하였다. 또 본 논문에서 제안한 구조의 1:2와 1:3의 전력 분배/결합기외 [10]의 구조와 S-Parameter를 비교?분석하였다. 결과적으로 본 연구에서 제시하는 수정된 형태를 적용할 경우 기존의 전력 분배/결합기의 반사손실 특성이 2 GHz에서 20dB이상 개선되었고 대역폭 또한 증가되는 것을 확인하였다. In this paper, tapered shape of multiport power divider/combiner modified for 2 GHz range from the model published by [10] is proposed. Parameters determining electrical property of the circuit structure have been analyzed by HFSS simulation. For input matching, balance of output signals and phase linearity at each output port, one circular hole has been etched out on the circuit surface. 1:2 and 1:3 power dividers/combiners designed by this study have been compared with the same circuits designed by the method of [10] in terms of S-parameters. As a result, it has been found that the modified structure of power divider/combiner have improved return loss more than 20 dB and another 18 dB, respectively, at 2 GHz.
Second-Order Temporal Interference with Thermal Light: Interference beyond the Coherence Time
Ihn, Yong Sup,Kim, Yosep,Tamma, Vincenzo,Kim, Yoon-Ho American Physical Society 2017 Physical Review Letters Vol.119 No.26
<P>We report the observation of a counterintuitive phenomenon in multipath correlation interferometry with thermal light. The intensity correlation between the outputs of two unbalanced Mach-Zehnder interferometers (UMZIs) with two classically correlated beams of thermal light at the input exhibits genuine second-order interference with the visibility of 1/3. Surprisingly, the second-order interference does not degrade at all no matter how much the path length difference in each UMZI is increased beyond the coherence length of the thermal light. Moreover, the second-order interference is dependent on the difference of the UMZI phases. These results differ substantially from those of the entangled-photon Franson interferometer, which exhibits two-photon interference dependent on the sum of the UMZI phases and the interference vanishes as the path length difference in each UMZI exceeds the coherence length of the pump laser. Our work offers deeper insight into the interplay between interference and coherence in multiphoton interferometry.</P>
Parametric modeling for the dielectric function of $Cd_{0.77}Mg_{0.23}Te$ alloy film
Ihn, Yong-Sub,Kim, Tae-Jung,Kim, Young-Dong The Korean Vacuum Society 2002 Journal of Korean Vacuum Science & Technology Vol.6 No.4
We performed the modeling of the dielectric functions of C $d_{0.77}$M $g_{0.23}$Te by using parametric semiconductor model. Parametric model describes the analytic dielectric function as the summation of several energy-bounded Gaussian-broadened polynomials and provides a reasonably well parameterized function which can accurately reproduce the optical constants of semiconductor materials. We obtained the values of fitting parameters of the Mg composition 0.23 in the parametric model. From these parameters we could remove interference oscillations to obtain the dielectric function of C $d_{0.77}$M $g_{0.23}$Te alloy film for full 0.5-6.0 eV energy range.y range.
Parametric modeling for the dielectric function of Cd0.77Mg0.23Te alloy film
Yong-Sub Ihn,Tae-Jung Kim,Young-Dong Kim 한국진공학회(ASCT) 2002 Journal of Korean Vacuum Science & Technology Vol.6 No.4
We performed the modeling of the dielectric functions of Cd_(0.77)Mg_(0.23)Te by using parametric semiconductor model. Parametric model describes the analytic dielectric function as the summation of several energy-bounded Gaussian-broadened polynomials and provides a reasonably well parameterized function which can accurately reproduce the optical constants of semiconductor materials. We obtained the values of fitting parameters of the Mg composition 0.23 in the parametric model. From these parameters we could remove interference oscillations to obtain the dielectric function of Cd_(0.77)Mg_(0.23)Te alloy film for full 0.5 - 6.0 eV energy range.