• Proceedings of the Korea Inteligent Information System Society Conference
• /
• 2000.11a
• /
• pp.235-244
• /
• 2000

본 논문에서는 모바일 인터넷으로 대표되는 제2차 IT혁명에서 세계 주도권을 노리고 있는 일본에 초점을 맞춘다. 특히 NTT DoCoMo의 i-mode 서비스, 즉$\ulcorner$휴대전화와 인터넷의 성공적 융합$\lrcorner$이라 할 수 있는 "모바일 인터넷"에 대한 분석과 성공전락 등을 통하여 향후 한국의 모바일 인터넷이 추구해야 할 방향성과 그 과제에 대하여 살펴보기로 한다.

• ETRI Journal
• /
• v.8 no.4
• /
• pp.144-153
• /
• 1986

본고는 '86년 10월초 수일간에 걸쳐 일본전신전화(주) (이하 NTT로 기술함) 를 방문하여 O / M (Operation & Maintenance) 현황에 대한 협의를 가진 것 중에서 NTT가 '85년도 회사체제로 발족하여 경쟁체제의 사업분야별 독립체산제 편제로 전환한 이래 가장 큰 힘을 기울이고 있는 network O/M 분야에 대한 내용을 정리한 것이다.

• Electronics and Telecommunications Trends
• /
• v.9 no.1
• /
• pp.51-64
• /
• 1994

전 세계적으로 통신사업자들의 조직재편 작업이 활발히 진행되고 있다. 본 고에서는 AT&T, BT 와 함께 세계통신사업의 전개방향을 주도하고 있는 NTT가 민영화와 경쟁도입이라는 새로운 환경하에서 어떠한 조직전략으로 환경적응을 모색하고 있는지를 분석함으로써 유사한 환경에 처한 국내사업자들의 조직전략 수립에 참고가 되도록 하였다.

• Journal of the Korean Magnetics Society
• /
• v.5 no.5
• /
• pp.690-694
• /
• 1995

Reducing media noise is a key to realizing high areal recording density. However, perpendicularly oriented Co-Cr films, stong candidates for high density recording media, have received little attention in terms of recording noise. We studied the noise characteristics of Co-Cr based alloy films by varying the compositionally separated structure. Co-Cr films with fine compositionally separated microstructure were observed to have low noise, which recording density dependence were negative or week. Studies on control of the microstructure and magnetic properties in combination with noise analysis are important to realize high density recording media.

• Journal of the Korean Ceramic Society
• /
• v.45 no.12
• /
• pp.766-771
• /
• 2008

We fabricated single cells with a cathode consisting of a $LaNi_{0.6}Fe_{0.4}O_3-Ce_{0.8}Sm_{0.2}O_{1.9}$ composite (LNF-S20DC composite) active layer and an LNF current collecting layer on a ${0.89ZrO_2}-{0.10Sc_2}{O_3}-0.01{Al_2}{O_3}$ electrolyte sheet. The cathode layers were prepared by the screen-printing method. The cathode properties of these cells were measured by the AC impedance method at $800^{\circ}C$. The cathodes with the ceria-LNF composite active layer exhibited high power performance prior to current loading. We investigated the influence of the mixture ratio of LNF and S20DC on the cathodes properties. The Sm in the ceria particles of the composite cathode was substituted with other rare-earth elements. Cathodes with Pr and Gd co-doped ceria in the active layer provided the better performance than those with Sm- or Gd-doped ceria.

• The KIPS Transactions:PartC
• /
• v.13C no.4 s.107
• /
• pp.447-454
• /
• 2006

An ad-hoc network routing protocol, AODV(Ad-hoc On-demand Distance Vector) initially uses ERS(Expanding Ring Search) algorithm to control the RREQ(Route Request) retransmission in the route discovery process. Because ERS uses the fixed NTT(Node Travesal Time), it does not reflect accurately ad-hoc network environment. In this paper, we propose an improved ERS algorithm which lowers the retransmission rate. It uses RREP(Route Reply) and gives different weights in NTT of each node in accordance with the adjacency to an originating node. To show the effectiveness of the proposed algorithm, we perform a simulation using ns2. The simulation results showed that the proposed algorithm has better performance than existing algorithms.

• Proceedings of the Korean Society for Quality Management Conference
• /
• 1998.11a
• /
• pp.211-216
• /
• 1998

• 한국공간정보시스템학회:학술대회논문집
• /
• 1999.04a
• /
• pp.169-191
• /
• 1999

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• v.16 no.8
• /
• pp.2816-2830
• /
• 2022

Number Theoretic Transform (NTT) is a method to design efficient multiplier for large integer multiplication, which is widely used in cryptography and scientific computation. On top of that, it has also received wide attention from the research community to design efficient hardware architecture for large size RSA, fully homomorphic encryption, and lattice-based cryptography. Existing NTT hardware architecture reported in the literature are mainly designed based on radix-2 NTT, due to its small area consumption. However, NTT with larger radix (e.g., radix-4) may achieve faster speed performance in the expense of larger hardware resources. In this paper, we present the performance evaluation on NTT architecture in terms of hardware resource consumption and the latency, based on the proposed radix-2 and radix-4 technique. Our experimental results show that the 16-point radix-4 architecture is 2× faster than radix-2 architecture in expense of approximately 4× additional hardware. The proposed architecture can be extended to support the large integer multiplication in cryptography applications (e.g., RSA). The experimental results show that the proposed 3072-bit multiplier outperformed the best 3k-multiplier from Chen et al. [16] by 3.06%, but it also costs about 40% more LUTs and 77.8% more DSPs resources.

• 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.