• Journal of Advanced Navigation Technology
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• v.15 no.1
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• pp.25-31
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• 2011

Recently NMEA 2000 protocol is familiarized as a standard real time instrument network of SOLAS ship. This paper is studied to develop NMEA 2000 based two-dimensional ultrasonic anemometer which is core device for navigation as a sensor of wind speed and direction using ultrasonic including temperature and barometer. Developed system is connected to NMEA 2000 network which is composed of various kinds of merchandised NMEA 2000 device such as depth gauge, speed gauge, GPS device etc. to test connectivity with other NMEA 2000 device and functional test are carried out as weather station in comparison with other merchandised weather station which are developed advanced foreign company to ascertain usability as a weather station on board.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.14 no.11
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• pp.1216-1224
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• 2003

In this paper Dual Band Log-Periodic Dipole Antenna(DLPDA), which can be used at the Cellular/IMT-2000 band, is proposed. The proposed antenna is composed of 2 of Log-Periodic Dipole Antenna(LPDA) and parasitic elements. To investigate the reliability of the proposed antenna, DLPDA is designed at the cellular/IMT-2000 band and analyzed by using the method of moment, Numerical results are compared with measured results. It is shown that although the antenna length is 70 cm, its radiation characteristics satisfied the design goals of gain, VSWR and beamwidth at the Cellular/IMT-2000 band. From these results, the proposed DLPDA is confirmed as the dual band antenna which can be used at the cellular/IMT-2000 band.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2002.11a
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• pp.749-753
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• 2002

Wireless technology is glowing rapidly in the new millennium period. By this technical progress, new idea which separate CDMA 2000-1x service and existing mobile service by the account appears in interconnection market. Especially fixed operator and mobile operator insist contrary opinions. Account Separation of CDMA 2000-lx service is not studied despite it's importance. This paper deal with this subject and analyse logic of operators opinion. By the result of this paper, CDMA 2000-lx is more a 3rd generation service than a 2.5rd generation service and the current account separation criteria based on using frequency bandwidth is not desirable.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.9B
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• pp.1579-1587
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• 2000

This paper presents the properties of the RF part in the receiving system based in IMT-2000 terminal technology. It mainly discuss the RF parameter performance of the receiving system for mobile telecommunication comparable to IS-98A and J-STD-018 specifications of commercially available CDMA and PCS, and is to anticipate the processing gain of the IMT-2000 receiving system, processing gain according to data processing rate, and terminal noise figure according to processing gain, relationship between noise figures according to Eb/Nt, Ioc. It is performed by such analysis method as CDMA and PCS receiving systems. Transmission bandwidth is n$\times$1.25 MHz(n=1, 3, 6, 9, 12) which is recommended by Qualcomm and NTT, the leading company in cdma 2000. Data transmission rate of IMT-2000 is classified into three cases as in moving vehicle environment of 144Kbps, outdoor pedestrian environment of 384Kbps, and indoor office environment of 2Mbps

• Journal of the Institute of Convergence Signal Processing
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• v.11 no.2
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• pp.125-131
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• 2010

This paper presents the implementation of a EBCOT TIER-1 for JPEG2000 Encoder. JPEG2000 is new standard for the compression of still image for overcome the artifact of JPEG. JPEG2000 standard is based on DWT(Discrete Wavelet Transform) and EBCOT Entropy coding technology. EBCOT(Embedded block coding with optimized truncation) is the most important technology that is compressed the image data in the JPEG2000. However, EBCOT has the artifact because the operations are bit-level processing and occupy the harf of the computation time of JPEG2000 Compression. Therefore, in this paper, we present modified context extraction method for enhance EBCOT computational efficiency and implemented MQ- Coder as arithmetic coder. The proposed system is implemented by Verilog-HDL, under the condition of TSMC 0.25um ASIC library, gate counts are 30,511EA and satisfied the 50MHz operating condition.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.10b
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• pp.1371-1374
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• 2001

핸드오프는 이동국이 통화 중에 이동하더라도 새로운 통화 채널을 확보하여 진행중인 호를 새로운 채널로 전환하는 과정이다. 본 논문은 IMT-2000 망에서 MSC 간 핸드오프 과정의 설계를 목적으로 한다. 이와 관련하여 IMT-2000 망 구조를 기술하고, IMT-2000 MSC 간 핸드오프 처리 방안으로 B-ISUP 메시지를 이용한 방안과 IS-41의 MAP을 이용한 방안을 비교 분석하였다. 또한, IS-41 MAP 기반의 MSC 간 핸드오프 호 처리 절차에 대해 기술하고, 핸드오프 기반의 IMT-2000 교환기 소프트웨어 블록 구조 및 기능을 설계하였다. 그리고, IMT-2000MSC간의 핸드오프 경로 구성 방안을 제시하고, IS-634와 IS-41 MAP규정을 만족하는 IMT-2000망에서의 MSC간 핸드오프를 위한 교환기 내부 소프트웨어 블록간의 호 흐름을 설계하였다.

• THE INTERNATIONAL COMMERCE & LAW REVIEW
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• v.46
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• pp.3-27
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• 2010

Incoterms are standard trade terms most commonly used in international sales contracts. ICC have updated six times to keep pace with current international trade practices. Amendments and additions were made in 1953,1967,1976,1980,1990 and presently in 2000. ICC is currently revising Incoterms 2000. The new edition, Incoterms 2010, is expected to enter into force on 1 January 2011. In this paper, I reviewed the present conditions of trade terms and the problems of Incoterms 2000 in our country. I hope this paper to contribute to revising works of Incoterms by reference of above mentioned contents, that is to say, ship's rail, expansion of seller's risk liability of FOB,CFR,CIF.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.8B
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• pp.1371-1382
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• 2000

IMT-2000 system is the third generation mobile communication system which aims at mobile multimedia services with global roaming. Like 2nd generation system, the IMT-2000 system is also under strong influence of interferences among active subscribers in the multiple access environment. That is, in multiple access environment, signals from one subscriber could interfere with others in the same cell or in the neighboring cells. The interference control in the IMT-2000 systems is much more difficult then the interference control in the 2ndgeneration CDMA cellular systems, since the transmitted power of a subcriber might be different that of others in the IMT-2000 system. In this paper, a parallel interference cancellation with traffic discrimination is proposed which can effectively cancel interferences by grouping the subscribers into several equi-power classes. As a conclusion, simulation results show that the proposed method outperforms the conventional partial PIC scheme in several aspects.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.14 no.4
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• pp.313-322
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• 2003

In this paper, the reverse link performance of imperfect power controlled cdma2000 cellular system that using array at a base station is analyzed, when MCGM beamforming algorithm and power control error is considered in shadowing. The blocking probability of the cdma2000 cellular system based on array parameters, E$\_$b//N$\_$0/ and interference statistics is calculated, and then the system capacity is calculated at a specific blocking probability. When the blocking probability is set 1 %, PCE(power control error) is 2 dB, M=2, 4, 8, 10, the capacity of cdma2000 is increased 2.3 ∼ 2.5 times higher than IS-95.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.13 no.10
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• pp.1061-1070
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• 2002

In this paper, we present a performance analysis of the smart antenna test-bed operating in a IS2000 1x through a test-bed that has been implemented on a DSP(TMS320C6711) board. The test-bed consists of a PC (for generating the RX data), beam-former(i.e., a stand-alone PCB for weight computation), and an interfacing module. The performance improvements compared to a normal base station system consisting of a single antenna are shown in terms the BER(bit error rate) in the wide-band CDMA channel.