• Journal of information and communication convergence engineering
• /
• 제17권2호
• /
• pp.161-165
• /
• 2019

In this study, zinc tin oxide (ZTO) thin-film transistors are researched to observe the correlation between the barrier potential and electrical properties. Although much research has been conducted on the electronic radiation from Schottky contacts in semiconductor devices, research on electronic radiation that occurs at voltages above the threshold voltage is lacking. Furthermore, the current phenomena occurring below the threshold voltage need to be studied. Bidirectional transistors exhibit current flows below the threshold voltage, and studying the characteristics of these currents can help understand the problems associated with leakage current. A factor that affects the stability of bidirectional transistors is the potential barrier to the Schottky contact. It has been confirmed that Schottky contacts increase the efficiency of the element in semiconductor devices, by cutting off the leakage current, and that the recombination at the PN junction is closely related to the Schottky contacts. The bidirectional characteristics of the transistors are controlled by the space-charge limiting currents generated by the barrier potentials of the SiOC insulated film. Space-charge limiting currents caused by the tunneling phenomenon or quantum effect are new conduction mechanisms in semiconductors, and are different from the leakage current.

• 한국정보통신학회논문지
• /
• 제6권6호
• /
• pp.863-872
• /
• 2002

Real-time(RT) object-oriented(00) distributed computing is a form of RT distributed computing realized with a distributed computer system structured in the form of an object network. Several approached proposed in recent years for extending the conventional object structuring scheme to suit RT applications, are briefly reviewed. Then the approach named the TMO(Time-triggered Message-triggered Object) structuring scheme was formulated with the goal of instigating a quantum productivity jump in the design of distributed time triggered simulation. The TMO scheme is intended to facilitate the pursuit of a new paradigm in designing distributed time triggered simulation which is to realize real-time computing with a common and general design style that does not alienate the main-stream computing industry and yet to allow system engineers to confidently produce certifiable distributed time triggered simulation for safety-critical applications. The TMO structuring scheme is a syntactically simple but semantically powerful extension of the conventional object structuring approached and as such, its support tools can be based on various well-established 00 programming languages such as C++ and on ubiquitous commercial RT operating system kernels. The Scheme enables a great reduction of the designers efforts in guaranteeing timely service capabilities of application systems.

• 한국통신학회논문지
• /
• 제18권3호
• /
• pp.449-455
• /
• 1993

단거리 통신 시스팀의 광원으로 유용한 단파장 AlGaAs/GaAs레이저 다이오우드의 열악한 특성을 개선하기 위하여 MBE에 의해 낮은 온도에서 성장한 AlGaAs/GaAs GRINSCH-QW 레이저 다이오우드를 RTA온도의 변화에 좌우되는 포토루미네센스에 의하여 연구하였다. $950^{\circ}C$에서 10초동안 RTA처리를 한후 양자우물 포토루미네센스의 세기는 대체로 10배정도 증가하는것을 보여주었다. 이것은 양자우물 영역에서 발광되지 않는 재결합이 감소된것과 관련된다. 열처리된 레이저 다이오우드의 임계전류는 4배로 감소되었으며 RTA에 의하여 레이저 다이오우드의 질이 개선되었음이 확인되었다.

• 한국진공학회:학술대회논문집
• /
• 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
• /
• pp.314-314
• /
• 2016

In this paper, the effects of carrier concentration on dielectric constant of ITO films were investigated by spectroscopic ellipsometry. From SE results, we find the pronounced shift of the ${\varepsilon}1$ peaks toward high energy with concentration; while contrarily, the ${\varepsilon}2$ values at low energy region increases with decreasing concentration. These shifts are attributed to the Burstein-Moss and free-carrier absorption effects within ITO films. With increases carrier concentration, the values of extinction coefficients show quite different behaviors in range of wavelength from 200 to 1200 nm. The reduction in k at ${\lambda}{\leq}500nm$, while increasing at ${\lambda}{\geq}500nm$ was observed. The QE of HJ solar cells behaviors can be roughly classified into two regions: short-wavelengths (${\leq}650nm$) and long-wavelengths region (${\geq}650nm$). With increasing carrier concentration as well as energy band gap, QE shows improvement at short-wavelength, while at long-wavelength QE shows opposite trend. Widening band gap energy due to Burstein-Moss shift is the key to improve QE in short-wavelength; simultaneously FCA effect due to optical scattering is attributed to the reduction in QE at long-wavelength. In spite of band gap extension, Jsc calculated from QE decreases from 34.7 mA/cm2 to 33.2 mA/cm2 with increasing carrier concentration. It demonstrated that FCA effect may more govern Jsc in the HJ solar cells.

• 한국자기학회지
• /
• 제17권1호
• /
• pp.14-17
• /
• 2007

고상 반응법을 써서 전이금속(Cr, Ti)을 치환한 란탄칼슘망간산화물, $La_{0.5}Ca_{0.5}(Mn_{0.98}TM_{0.02})O_3$의 자성특성을 연구하였다. 자성 특성은 VSM을 써서 측정하였고, 50 Oe에서 zero field cooling과 field cooling을 하면서, 자화-온도측정을 Cr과 Ti 치환한 경우에 측정하였다. $La_{0.5}Ca_{0.5}(Mn_{0.98}Cr_{0.02})O_3$는 클러스터 또는 스핀유리와 유사한 거동을 보였으며, $La_{0.5}Ca_{0.5}(Mn_{0.98}Ti_{0.02})O_3$에서는 관찰되지 않았다. 큐리온도는 전이금속이 치환된 시편의 경우 란탄칼슘망간산화물 $La_{0.5}Ca_{0.5}MnO_3$의 큐리온도 245.5K에서 감소한, 235.5 K [$La_{0.5}Ca_{0.5}(Mn_{0.98}Cr_{0.02})O_3$], 232.7 K [$La_{0.5}Ca_{0.5}(Mn_{0.98}Ti_{0.02})O_3$]로 모두 감소하였다. 자벽 고정(domain wall pinning)을 알아보기 위해 온도에 따른 보자력 측정을 하였고, 이 결과를 defect와 자벽 간의 상호작용의 관점으로 해석하였다.

• Journal of Radiation Protection and Research
• /
• 제46권2호
• /
• pp.80-82
• /
• 2021

Dr. Haruyuki Ogino, a member of the Japan Health Physics Society (JHPS), was awarded the 2021 Bo Lindell Medal by the International Commission on Radiological Protection (ICRP). To commemorate this, the "Joint JHPS-KARP-ARPS program for young radiation protection (RP) scientists to discuss the future of RP" was organized via a web meeting system. First, Dr. Ogino gave a lecture, and then young researchers selected from each academic society made presentations on the future of RP. After the presentations by the three researchers, a free talk was held-young researcher groups of each country being active is a great opportunity to collaborate and exchange information. It was emphasized that the low awareness of knowledge related to radiation has been common to all of the participating countries. Thus, it is necessary to utilize communication via web technology, as done for this program, effectively. One of the biggest advantages for Asia and Oceania is that we do not have a significant time difference. The round-table discussion was concluded by expressing the hope of active exchange and development of young researchers in the future.

• 한국전자통신학회논문지
• /
• 제15권4호
• /
• pp.659-664
• /
• 2020

본 논문에서는 실리콘 기반의 광 집적회로에서 외부 전압 조절을 통해 |l|=1 궤도 각운동량 모드의 궤도 각양자수를 변조할 수 있는 전기 광학 변조기를 설계하였다. 설계된 전기 광학 변조기는 위치별로 서로 다른 도핑농도를 가지는 실리콘 코어와 실리콘 산화막으로 구성되어 있으며, 도핑농도의 분포를 통해 궤도 각운동량 모드를 구성하는 두 고유 모드의 전파 손실과 유효굴절률 변화량을 조절할 수 있도록 설계되었다. 변조기는 역전압을 기준으로 -0.33V에서는 궤도 각운동량 모드의 부호가 유지되는 광도파로로, 10V에서는 궤도 각양자수 부호 변환기로서 동작한다. 고유 모드 확장법으로 계산한 신호변조 후의 전기장 분포를 통해 얻은 궤도 각양자수는 두 동작모드에서 모두 |l|>0.92 으로 매우 높은 궤도 각운동량 모드 순도를 보였다.

• 한국전자통신학회논문지
• /
• 제12권1호
• /
• pp.101-108
• /
• 2017

양자게이트 행렬은 치수가 r, 제어상태벡터 수가 n 및 표적상태벡터 수가 1인 경우에 $r^{n+1}{\times}r^{n+1}$ 차원 행렬이므로 n 증가에 따른 행렬 크기는 지수 함수적 증가 특성을 갖는다. 만약 제어상태벡터의 경우 수가 $2^n$이라면 $2^n-1$ 경우는 입력이 출력에 보전되는 단위행렬의 항등연산이고, 오직 한 개의 제어상태벡터 연산만이 표적상태벡터에 대한 유니터리 연산이다. 본 논문은 행렬차원 증가에 결정적 기여를 하는 $2^n-1$개의 단위행렬 연산을 한 동작의 산술멱승 연산으로 대체할 수 있는 새로운 함수 임베딩 방법을 제안한다. 제안한 함수 임베딩 방법은 다치 임계값을 갖는 2진 리터럴 스위치를 사용하므로 범용 하이브리드 MCU 게이트를 $r{\times}r$ 유니터리 행렬로 실현할 수 있다.

• 대한원격탐사학회:학술대회논문집
• /
• 대한원격탐사학회 2008년도 International Symposium on Remote Sensing
• /
• pp.220-223
• /
• 2008

A camera system for the satellite application performs the mission of observation by measuring radiated light energy from the target on the earth. As a development stage of the system, the signal level analysis by estimating the number of electron collected in a pixel of an applied CCD is a basic tool for the performance analysis like SNR as well as the data path design of focal plane electronic. In this paper, two methods are presented for the calculation of the number of electrons for signal level analysis. One method is a quantitative assessment based on the CCD characteristics and design parameters of optical module of the system itself in which optical module works for concentrating the light energy onto the focal plane where CCD is located to convert light energy into electrical signal. The other method compares the design\ parameters of the system such as quantum efficiency, focal length and the aperture size of the optics in comparison with existing camera system in orbit. By this way, relative count of electrons to the existing camera system is estimated. The number of electrons, as signal level of the camera system, calculated by described methods is used to design input circuits of AD converter for interfacing the image signal coming from the CCD module in the focal plane electronics. This number is also used for the analysis of the signal level of the CCD output which is critical parameter to design data path between CCD and A/D converter. The FPE(Focal Plane Electronics) designer should decide whether the dividing-circuit is necessary or not between them from the analysis. If it is necessary, the optimized dividing factor of the level should be implemented. This paper describes the analysis of the electron count of a camera system for a satellite application and then of the signal level for the interface design between CCD and A/D converter using two methods. One is a quantitative assessment based on the design parameters of the camera system, the other method compares the design parameters in comparison with those of the existing camera system in orbit for relative counting of the electrons and the signal level estimation. Chapter 2 describes the radiometry of the camera system of a satellite application to show equations for electron counting, Chapter 3 describes a camera system briefly to explain the data flow of imagery information from CCD and Chapter 4 explains the two methods for the analysis of the number of electrons and the signal level. Then conclusion is made in chapter 5.

• 한국통신학회논문지
• /
• 제41권4호
• /
• pp.489-498
• /
• 2016

정보복제 및 도/감청이 기술적으로 불가능한 양자통신의 출현에도 불구하고, 일부 해커들의 부적절한 동기와 목적에 의한 사이버테러(cyber-terror)는 지속적으로 시도될 것으로 예상된다. 따라서 해킹의 주체인 해커들의 심리적 관점에 대한 연구의 중요성과 필요성이 더욱 커지고 있다. 본 연구는 Beebe & Clark(2006)의 연구를 보완하여, 탈선적 해킹에 관련된 해커들의 주요한 심리적 독립변수가 무엇인지 탐색하고, 그에 따른 해킹의도와 실제 해킹경험을 종속변수로 측정하였다. 본 연구의 결과로서, 해킹의도와 해커들의 타입을 구분해서 예측할 수 있는 모델을 도출하였으며, 이 결과는 향상된 사이버 보안을 위한 인적 관리에 응용할 수 있음을 제안하였다.