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박찬호 ( Park¸ Chanho ) 한국개혁신학회 2021 한국개혁신학 Vol.71 No.-
벤자민 워필드는 구 프린스턴 신학자 중 한 명이다. 그는 잘 알려진 유신론적 진화론자이다. 다윈주의에 정면으로 반대하는 찰스 핫지의 입장에 비해 워필드는 다윈의 진화론에 대해 보다 호의적이다. 그의 여러 저술은 진화를 긍정적으로 인정한다. 마크 놀과 리빙스턴은 워필드가 성경과 진화론의 권위 모두를 인정하는 대표자들 중 한 명이라고 주장한다. 그러나 최근 프레드 자스펠은 리빙스톤과 놀의 견해에 이의를 제기한다. 자스펠은 워필드가 진화라는 개념을 인정하고 있지만 진화론 자체를 받아들이지 않았다고 주장하고 있다. 진화론에 대한 워필드의 견해에 대한 이러한 대립을 해결하기 위해서는 복잡한 진화 개념을 명확히 해야 한다. 직접 창조, 간접 창조, 그리고 진화에 대한 워필드의 언급은 진화론에 대한 그의 견해를 밝혀줄 수 있을 것이다. 또한 유신론적 진화론에 대한 현대적인 비판에 워필드가 동조할 것 같은 표현들은 유신론적 진화론자로 워필드를 분류하지 못하게 하는 단서가 될 수 있을 것 같다. Benjamin B. Warfield is one of the Old Princeton theologians. He is a well-known theistic evolutionist. In comparison to the position of Charles Hodge who directly opposes to Darwinism, Warfield changes his attitude to Darwinian evolutionism. His several writings acknowledges evolution positively. Knoll and Livingstone contends that Warfield is one of the representatives who opts for both the authority of the Bible and evolutionism. Recently, however, Fred Zaspel raises an objection to the view of Livingstone and Knoll. Zaspel admits Warfield entertains the idea of evolution but does not accept the evolutionism itself. In order to solve this confrontation on Warfield’s view concerning evolutionism, we should make the complicated concept of evolution clear. Warfield’s references on direct creation, indirect creation and evolution might shed light on his view on evolutionism. Also, the expressions Warfield is likely to sympathize with modern criticism of theistic evolutionism could be a clue to preventing Warfield from being classified as a theistic evolutionist.
Frequency divided group beamforming with sparse spacefrequency code for above 6 GHz URLLC systems
Chanho Yoon(Chanho Yoon),Woncheol Cho(Woncheol Cho),Kapseok Chang(Kapseok Chang),Young-Jo Ko(Young-Jo Ko) 한국전자통신연구원 2022 ETRI Journal Vol.44 No.6
In this study, we propose a limited feedback-based frequency divided group beamforming with sparse space-frequency transmit diversity coded orthogonal frequency division multiplexing (OFDM) system for ultrareliable low latency communication (URLLC) scenario. The proposed scheme has several advantages over the traditional hybrid beamforming approach, including not requiring downlink channel state information for baseband precoding, supporting distributed multipoint transmission structures for diversity, and reducing beam sweeping latency with little uplink overhead. These are all positive aspects of physical layer characteristics intended for URLLC. It is suggested in the system to manage the multipoint transmission structure realized by distributed panels using a power allocation method based on cooperative game theory. Link-level simulations demonstrate that the proposed scheme offers reliability by achieving both higher diversity order and array gain in a nonline-of-sight channel of selectivity and limited spatial scattering.
Chanho Yoo,Tae Whan Kim 한국물리학회 2016 Current Applied Physics Vol.16 No.2
The current density-voltage (J-V) characteristics of an organic layer sandwiched between two electrodes were simulated by using the space-charge-limited current (SCLC) model and the trap-assisted tunneling (TAT) model taking into account the leakage current paths. The experimental J-V curves of the Al/Alq3/ indium-tin-oxide (ITO) and the Al/mCP/ITO devices fabricated by thermal evaporation were in reasonable agreement with the simulated results calculated by the SCLC and TAT models. The tunneling process in an organic layer was significantly related to the nature traps of disordered organic semiconductors. The leakage current of an organic layer was dominantly attributed to the TAT mechanism.
Design of eMMC Controller with Virtual Channels for Multiple Processors
Chanho Lee,Chulhoon Kim 대한전자공학회 2018 Journal of semiconductor technology and science Vol.18 No.2
Portable embedded systems includes several non-volatile memory devices for the external storage. Multiple processors and multiple processing are popular and reading and writing data in the storage limit the performance of the system. The conventional architectures combine the devices to a single channel or assign the devices to multiple channels one by one to increase the performance. However, performance improvement depends on the applications due to the various requirements of data transfer. In this paper, we propose architecture for non-volatile memory controller with virtual channels for systems with multiple processors. The proposed architecture has an AMBA AXI master interface for data transfer and an AMBA APB slave interface for writing instructors and reading status and responses to be connected to a host system. Device adapters are connected to the devices and form physical channels. It can respond to the requests of the multiple processors by configuring virtual channels which have a single or multiple physical channels and can be activated independently. The waiting times and the transfer times of memory requests can be traded-off dynamically for the better system performance. An eMMC controller is designed using Verilog-HDL according to the proposed architecture, and is implemented using an FPGA. The operation of the controller is verified by simulation and measurement.
Chanho Yoon,Hoojin Lee,Joonhyuk Kang IEEE 2011 IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY Vol.60 No.3
<P>In this correspondence, we evaluate the symbol error rate (SER) and information outage probability (IOP) of space-time block codes (STBCs) from coordinate interleaved orthogonal designs (CIODs) in the composite channel of lognormal shadowing and Rayleigh fading. By applying the Gauss-Hermite quadrature integration, we derive an accurate closed-form approximation for the symbol pairwise error rate (SPER) and corresponding tight upper and lower bounds on the SER of STBCs from CIODs. An accurate closed-form approximate formula for the IOP is also derived by formulating the composite squared lognormal/chi-square probability density function and exploiting the high-signal-to-noise-ratio (SNR) approximation technique. Furthermore, we investigate the achievability of full diversity in Rayleigh fading channels with shadowing effects. Finally, various Monte Carlo simulations are performed to validate our theoretical results.</P>
Fully Integrated HBT MMIC Series-Type Extended Doherty Amplifier for W-CDMA Handset Applications
Chanhoe Koo,권영우,김정현 한국전자통신연구원 2010 ETRI Journal Vol.32 No.1
A highly efficient linear and compactly integrated series-type Doherty power amplifier (PA) has been developed for wideband code-division multiple access handset applications. To overcome the size limit of a typical Doherty amplifier, all circuit elements, such as matching circuits and impedance transformers, are fully integrated into a single monolithic microwave integrated circuit (MMIC). The implemented PA shows a very low idle current of 25 mA and an excellent power-added efficiency of 25.1% at an output power of 19 dBm by using an extended Doherty concept. Accordingly, its average current consumption was reduced by 51% and 41% in urban and suburban environments, respectively, when compared with a class-AB PA. By adding a simple predistorter to the PA, the PA showed an adjacent channel leakage ratio better than -42 dBc over the whole output power range.
An IIR based Low Complexity Timing Synchronization Method for Spread Spectrum Systems
Chanho Yoon(윤찬호),Hoojin Lee(이후진) 한국정보기술학회 2013 Proceedings of KIIT Conference Vol.2013 No.5
본 논문에서는 복잡도가 낮은 무한 임펄스 응답 필터를 기반으로 한 타이밍 동기 추정 방법을 제시하고자 한다. Monte-Carlo 실험을 통해 AWGN만 있는 채널의 경우 ideal한 성능에 도달하는 것을 보이며 일반적인 multipath fading 채널 환경에서 반송파 주파수 오차가 있는 경우에도 robust한 성능을 나타낸다. In this paper, we propose a low complexity infinite impulse response (IIR) filter based moving average block timing synchronization method for spreaded systems operating at extremely low SNR region. By comparing the performance of the synchronization schemes and Monte-Carlos simulation results, we validate that our low complexity solution performs extremely well at very low SNR and approaches that of an ideal case in AWGN only channel.