• Journal of Korea Multimedia Society
• /
• v.6 no.7
• /
• pp.1277-1285
• /
• 2003

In this paper, we present a conference key authentication mechanism by employing an algebraic method on IMT-2000 environment. To accomplish this, the symmetric balanced incomplete block design is applied for generating a conference key and then this key is distributed to participants. Through the technique for creation of a conference key and mutual authentications peformed based on identification information, a communication protocol is designed. The protocol proposed minimizes the communication complexity for generating a conference key. On a special case the complexity is O(equation omitted), where v is the number of participants. The security of the mechanism, which is a significant problem in construction of secure systems, can be assured since finding discrete logarithms is generally a hard problem.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.26 no.11B
• /
• pp.1620-1627
• /
• 2001

In this paper, a broadband microstrip antenna for PCS and IMT-2000 service is designed. To obtain the broadband characteristics of an antenna, we utilized the multi-layered structure composed of two foam material layers, parasitic element and aperture coupled feeding network. The broadband characteristic is obtained by changing the size of parasitic element and the height of foam materials. In addition to that, the usage of metal layer at the distance of λ/4 from feed-line, back radiation is reduced. The bandwidth of a single element for VSWR less than 1.3 is about 550MHz. The bandwidth of a designed 1$\times$4 array antenna for VSWR less than 1.3 is about 460MHz. The gain of a designed array antenna is about 11.15∼12.15dBi and the front-to-back ratio is about 30dB.

• Journal of Oriental Neuropsychiatry
• /
• v.11 no.2
• /
• pp.63-78
• /
• 2000

Headache is one of the most common medical complaints. It is not so easy to manage headache. especially if it is chronic although it seldom cause serious problem. There are many psychological factor known to induce, maintain an aggravate symptom in patients with chronic headache. The purpose of this study is to investigate clinical characteristics with ABR-2000 was carried out for 57 patients who had been suffered from headache for 6 months from march to August 2000.The results were as follows:1. According to the statics, on the whole woman's rate was higher than man's, and the mean duration of the headache was 8.06 years.2. Common associated symptoms were nausea. dyspepsia, dizziness, palpitation, fatigue, depression, etc.3. According to oriental medical differentiation of symptoms and signs, the rate of stagnation of the liver-qi's fire-transmission(肝變化火), deficiency of blood(血虛) and plegm syncope (痰厥), these three types were hghest.4. Result of analyzing ABR-2000 is that the rate of low response is higher than high response's on each item. But result of Graph A is that the rate of high response in higher than that of low response only in deficiency of Yin(陰虛) and the rate of high response in stagnation of the liver-qi's fire-transmission(肝變化火) and deficiency of blood (血虛) is comparatively high. Result of Graph R is that the rate of high response in wind-heat(風熱), deficiency of blood(血虛) and plegm syncope(痰厥) is comparatively higher than in others.

• The KIPS Transactions:PartB
• /
• v.18B no.6
• /
• pp.349-354
• /
• 2011

In ROI processing of JPEG2000, a region of large image indicated by the user must be processed preferentially, because it takes a considerable amount of time to display the full image. When the user indicates a region of the outlined image, then the browser masks the region and sends the mask information to the server that transmitted the outlined image. The server that receives the mask information preferentially sends the corresponding code blocks. Here, a quick generation of mask information is important. In this paper, we use 48 predefined mask patterns, which are defined according to the distribution shape of ROI and background to reduce the computing time. As a result, compared to other methods that precisely handles the ROI and background, the processing time of the method is remarkably reduced, but the quality is short of the existing methods just a little bit.

• Journal of Korean Society of Transportation
• /
• v.17 no.4
• /
• pp.19-31
• /
• 1999

A first version of KHCM was Published in 1992, and is currently used extensively in engineering Practice. The study of new manual was initiated in 1998 and is intended to be ready for publication by the year 2000. The purpose of this paper is to indicate the study direction of basic freeway section by comparing the results of each country HCM. 1985 USHCM, 1997 USHCM, 1992 K17CM, German HCM, Japan HCM, Australian HCM. Taiwan HCM, and Canadian HCM have been reviewed. All the country except Germany followed the same method developed in 1985 USHCM for analysing basic freeway section. Therefore the method of USHCM and German HCM have been introduced in detail. Finally. the Problem of 1992 KHCM have been suggested.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.29 no.1C
• /
• pp.35-44
• /
• 2004

In this paper, we design an efficient VLSI architecture of entropy coding algorithm in JPEG2000. Entropy coder is a context-based binary arithmetic encoder, and composed of a Context Extractor(CE) and an Arithmetic Coder(AC). We speed-up CE by skipping no-operation bits in coding passes, and AC is to be performed based on MQ coder. Because of using Qe value associated with each allowed context and probability estimation, MQ coder is a multiplication free coder that reduces computation loads and makes simple the structure of arithmetic coder. We have developed and synthesized the VHDL models of CE and AC pairs using Xilinx FPGA technology. The proposed architecture operates up to 30MHz.

• Journal of the Institute of Convergence Signal Processing
• /
• v.8 no.3
• /
• pp.149-155
• /
• 2007

In this paper, we propose an real-time implementation of JPEG2000 codec on the ARM9 processor. The implemented codec is designed to separate control codes from data management codes in order to use effectively the system resources such as processor and memory. Especially, in embedded situations like cellular phones it is very important to provide good services using limited processor and internal memory. Since ARM9 series processors do not provide floating-point, large amount of computational time is required to perform the operation which needs highly repetitive floating-point computations like DWT(discrete wavelet transform). The proposed codec was programed using fixed-point to overcome this weakness. Also code optimization considering cache memory was applied to further improve the computational speed.

• Journal of Satellite, Information and Communications
• /
• v.10 no.1
• /
• pp.1-5
• /
• 2015

With the help of fast growing multimedia technology and high preference for users of large screens, the newest video coding standard, HEVC (High Efficiency Video Coding) high-quality video compression), has been introduced. Therefore, the high definition image services which are four times more clear than conventional HD video, are getting popular. JPEG 2000 also has stated to support 4K and 8K UHD. As a result, it requires fast processing technology to read and write UHD images. This paper introduces a study on fast parallel processing technology for UHD images. For this purpose, first, JPEG 2000 is reviewed and a GPU based parallel implementation is proposed for a preprocessing of color conversion stage. The parallelled algorithm is implemented with OpenCL (Open Computing Language). The simulation results show that the proposed method shows 5 times performance improvements on processing speed for 4K UHD over the method using threads.

• The Journal of the Korea Contents Association
• /
• v.19 no.3
• /
• pp.213-222
• /
• 2019

This article aimed at change patterns of representations of male character and cinematic space in 2000s korean division films. The concept of division film is the unique particularity film in the narrative and representation about Korean division. The Gancheop is the special character of korean films and have been reproduced in a variety of ways. In the past, Korean films have been dealt with Korean Civil War and 'special nature' of inter-korean ties. But in the 2000s, the representation of Gancheop in films has begun to change and filmed in a variety of genres such like comedy, thriller, romance and so on. , , are consistent with close relationship of male characters. The relationship is represented as friend, brother, partner. The meaning of these changes symbolizes our concept of national unification.

• Journal of Korean Society of Industrial and Systems Engineering
• /
• v.28 no.2
• /
• pp.60-68
• /
• 2005

ISO 9000 quality standards families were established in 1987 and have been started to implement Korean industry since early 1990s. ISO 9000 standards families of 1987 were revised in 1994 and 2000, respectively, by request of world wide certification bodies and industry quality experts. This article reviews the necessity of ISO 9001 :2000 revision, quality management principles behind it, and benefits that ISO 9001: 2000 could bring. We summarize responses of foreign industry that ISO 9001: 2000 has been implemented. Survey questionnaire for 23 requirements of ISO 9001: 2000 from manufacturing companies of Busan and Kyungnam provinces are collected. Research hypotheses that there is any difference in quality management system practical application due to company size and implementation motivation are tested using SPSS. Finally, recommendations are provided for operating successful quality management system.