• The Transactions of the Korean Institute of Electrical Engineers
• /
• v.36 no.3
• /
• pp.179-187
• /
• 1987

Dual converter using diode bridge and 6-thyristor is discussed and the characteristics of this converter depending on their switching mode is revealed. The switching modes of converter operation are identified on both ac and dc sides. The circuit has the ability to accept or deliver DC current without change of nominal DC voltage magnitude or polarity and has the capability not only to instantaneously change from motoring to generating and vice versa, but to operate cycloconverter.

• Journal of Radiation Protection and Research
• /
• v.26 no.3
• /
• pp.281-286
• /
• 2001

The composition and design of a real-time personal dose measurement and management system are described in this paper. Accordingly, some pertinent hardware circuits and software codes including their operation modes have also been presented.

• Journal of KSNVE
• /
• v.6 no.4
• /
• pp.499-502
• /
• 1996

Interior noise, engine speed and vehicle speed are measured under transient road-load condition and interior noise signal is transformed by using the transient signal analysis methods, such as the spectrogram and wavelet transform. Using the analyzed results, subjective noise metrics such as the loudness, sharpness and articulation index at each vehicle speed can be estimated and characteristics of interior noise for various running modes can be discussed in the viewpoint of noise quality.

• Journal of the Optical Society of Korea
• /
• v.11 no.1
• /
• pp.10-17
• /
• 2007

We need two operation modes to obtain the complex hologram without bias and the conjugate image in the modified triangular interferometer (MTI). To solve the problem, we proposed the optimized MTI with one wave plate, which can obtain cosine and sine functions by the combination of one wave plate and one linear polarizer. In the extraction of phase term using the combination of polarization components, the phase error occurs, and we analyzed such potential phase errors in the optimized MTI.

• Proceedings of the KIPE Conference
• /
• 2010.07a
• /
• pp.477-478
• /
• 2010

In this paper, soft switching boost converter with ZVT(Zero Voltage Transition) method was proposed. Each switch of the proposed ZVT converter is operated under soft switching condition through using auxiliary resonant circuit. Also, the ZVT converter is verified through operation modes analysis and simulation.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 1996.06b
• /
• pp.134-139
• /
• 1996

This paper discusses the user interface for content selection with a video-on-demand system. We suggest two modes for the selection process: active and passive. This paper analyses various video intensive user interfaces using logs of user operation to understand how users behave in each mode.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
• /
• 2007.04a
• /
• pp.349-354
• /
• 2007

• Proceedings of the KIPE Conference
• /
• 2004.11a
• /
• pp.41-44
• /
• 2004

일반적으로 버크/부스트용 양방향 컨버터의 구현은 단 전원을 사용하는 각각의 PWM IC, 전류제어 PW 방식을 사용하게 된다. 이 경우 한쪽 모드로 동작시 다른 모드 제어기의 에러 앰프는 포화되기 때문에 모드 절환 동작시 마다 일정 시간 스위칭 동작을 멈추게 하는 회로가 필요하게 되어 원활한 방향 절환을 이룰 수 없게 된다. 본 연구에서는 양전원을 사용하는 하나의 제어기를 설계하여 방향 절환시의 문제점을 해결하고자 한다.

• KIPS Transactions on Computer and Communication Systems
• /
• v.11 no.6
• /
• pp.167-174
• /
• 2022

PIPO lightweight block ciphers were announced in ICISC'20. In this paper, a single-block optimization implementation and parallel optimization implementation of PIPO lightweight block cipher ECB, CBC, and CTR operation modes are performed on a 32-bit RISC-V processor. A single block implementation proposes an efficient 8-bit unit of Rlayer function implementation on a 32-bit register. In a parallel implementation, internal alignment of registers for parallel implementation is performed, and a method for four different blocks to perform Rlayer function operations on one register is described. In addition, since it is difficult to apply the parallel implementation technique to the encryption process in the parallel implementation of the CBC operation mode, it is proposed to apply the parallel implementation technique in the decryption process. In parallel implementation of the CTR operation mode, an extended initialization vector is used to propose a register internal alignment omission technique. This paper shows that the parallel implementation technique is applicable to several block cipher operation modes. As a result, it is confirmed that the performance improvement is 1.7 times in a single-block implementation and 1.89 times in a parallel implementation compared to the performance of the existing research implementation that includes the key schedule process in the ECB operation mode.

• Proceedings of the KSR Conference
• /
• 2011.10a
• /
• pp.2292-2299
• /
• 2011

The CBTC(Communication Based Train Control) system, a recent train control system, is a wireless communication based train control system that is operated in the moving block system control by tracking trains in real time. In additioin, the system helps to increase the volume of traffic by shortening driving headways through controlling moving block system control. Furthermore, driverless modes are performed by controlling ATP(Automatic Train Protection)/ATO(Automatic Train Operation). In this paper, controllable elements in ATO driverless train control system, affecting comfortable ride, will be analysed and applied to CBTC train control system that developed by POSCO ICT. Finally, the test results of improved comfortable ride will be showed by appling the developed system to the Gyeong-san light rail transit test track.