• Journal of the Institute of Electronics Engineers of Korea TC
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• v.44 no.3 s.357
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• pp.85-91
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• 2007

Satellite Digital Multimedia Broadcasting (S-DMB) is the digital convergence service of broadcasting and communication for mobility and portability. Broadcasting service of S-DMB can be taken by the mobile phone or vehicle terminals anytime and anywhere. S-DMB system is currently providing 11 video channels and 26 audio channels. As the demand of multimedia service is recently increasing, S-DMB system needs high quality and new contents service. Therefore we need to make efficient S-DMB with more channel ability and high transmission quality. In this paper, we propose new S-DMB system that can be applied to powerful channel coding scheme and hierarchical 8-PSK(8-Phase Shift Keying) modulation with Backwards Compatibility modes that simultaneously can support both current and new system. And we analyze the performance of current S-DMB system and verify a possibility of advanced S-DMB through computer simulation.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.44 no.5
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• pp.29-35
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• 2007

Recently, as the demand of mobile multimedia devices increases and T-DMB is started in Korea, the need of research for integration of mobile devices such as cellular phone, navigation, and portable multimedia player becomes higher. In order to integrate mobile devices, it is necessary to support microprocessor with fast speed and various devices with multimedia service. In this paper, we construct Windows CE 5.0 platform whose BSP supports the embedded system board with ARM11 core and various devices and applications. We also implement the DMB device driver which supports busy waiting and interrupt driven I/O techniques, compare their performance, and then suggest the method to efficiently use the resources of embedded system.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.20 no.4
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• pp.7-16
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• 2020

The mobile electronic notification service delivers notifications through mobile phone text or app-based message push to solve various problems of the paper-based mail service. And it is a service that an electronic document relay company proves to prove delivery. In order for public and administrative agencies to provide mobile electronic notification service, the user's identification information of the mobile phone number or the subscribed app is required. To overcome these limitations, ICT-regulated sandbox system was used to allow collective conversion of users' resident registration numbers into connecting information (CI). Therefore, in this paper, we propose a technical method for safe management of user CI in mobile electronic notice service, identity verification of electronic notice readers, and prevention of forgery and forgery of electronic notices. Through the proposed method, it is confirmed that the service can be activated by minimizing the adverse function of the mobile electronic notification service by securing the user's convenience and technical safety for the CI.

• Journal of KIISE:Databases
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• v.32 no.1
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• pp.56-70
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• 2005

The results of location-dependent queries(LDQ) generally depend on the current locations of query issuers. Many mechanisms, e.g. broadcast scheme, hoarding, or racking policy, have been developed to improve the system peformance and provide better services, which are specialized for LDQs. Considering geographical adjacency of data and characteristics oi target area, caching policy and broadcast scheme affect the overall performance in LDQ. For this reason, we propose both the caching policy and broadcast scheme, which these features are reflected in. Based on the adjacency of data in LDQ, our broadcast scheme use Hilbert curve to cluster data. Moreover, in order to develop the caching policy suitable for LDQ on urban area, we apply the moving distance of a MH(Mobile Host) to our caching policy We evaluate the performance of the caching policy measuring the workload of MHs and the correctness of LDQ results and the performance of the broadcast scheme measuring the average setup-time of MHs in our experiments. Finally, we expect that our caching policy Provides more correct answers when executing LDQ in focal cache and leads significant improvement of the performance of MHs. It also seems quite probable that our broadcast scheme leads improvement of battery life of the MH.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2010.11a
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• pp.82-85
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• 2010

인터넷의 급속한 발달과 이미지 콘텐츠 개발 기술의 발달로 현재 누구나 쉽게 이미지 콘텐츠의 공유 및 배급이 용이해졌다. 그러나 이로 인해 누드나 포르노와 같은 불건전한 유해 이미지들의 접근 역시 쉬워지고 있다. 특히, 스마트 폰이나 스마트 TV 등 멀티미디어 기능이 가능한 휴대장치 및 단말기의 비약적인 발전으로 인하여, 언제 어디서나 우리들은 유해 이미지의 노출되어 있다. 따라서 유해 이미지 시청이 적당하지 않은 연령층까지 무방비 상태에 놓여 있기 때문에 이를 막을 수 있는 시급한 대책이 요구되고 있다. 본 논문에서는 이중 피부 화소 검출에 이용하여 인체 영역 검출해내고 이것을 이용하여 유해 이미지 분류를 위한 방법을 제안하고자 한다. 일반적으로 피부 화소 검출 기법은 오차율을 가지고 있기 때문에 정확한 검출이 힘들다. 따라서 우리는 검출에 대한 강도를 조절하여 이중으로 피부 화소를 검출하여 좀더 정확한 피부 영역을 획득한다. 또한 기존의 방법들은 대체로 일차적인 피부 영역 검출에 초점을 둔 반면, 유해 판별의 주된 기준이 되는 가슴이나 성기, 엉덩이 등을 좀 더 중점적으로 찾으려 하지 않았다. 따라서 본 논문에서는 검출된 피부 영역에서 유해 부위를 좀 더 집중적으로 찾아 유해 판별 성능을 높이는 방법을 제안하고 실험으로 증명을 하고자 한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.16 no.4
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• pp.27-30
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• 2016

in this paper, to improve the narrow bandwidth problem of the microstrip antenna for WLAN and WiFi dual band array antenna was designed to satisfy the bandwidth of 3.6GHz and 5.2GHz it contained with IEEE 802. 11. The substrate of proposed microstrip array antenna is FR-4(er=4.3) and $25mm{\times}45mm{\times}0.8mm$ size and thickness t=0.035mm, and the simulation was used for CST Microwave Studio 2014. input return loss compared -10dB less than operates at and when gain 3.6GHz 2.516dB, 5.2GHz showed the results of 3.581dB. the antenna designed to be miniaturized and the be used in electronic devices such as mobile phone.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.11 no.2
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• pp.213-218
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• 2011

In this paper, we have developed a tongue diagnosis system using fuzzy rules. A healthy person's tongue is red in color and has less tongue coating. However, when a person suffers from a disease, the color of their tongue changes from red to white, blue, or black. Therefore, it can analyze patient's health if analyze color and coated tongue of tongue. Medical diagnosis system can automatically determines the symptoms of the disease of a patient and their and calculate the optimal acupuncture time on the basis of the patient's physical conditions, illness conditions, and age from any place and at any time. The computer simulation results have shown that electro-acupuncture administered by using the medical diagnosis system developed in this study is more effective than the conventional method.

• Journal of Broadcast Engineering
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• v.16 no.4
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• pp.602-613
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• 2011

In this paper, we propose a hybrid stereoscopic camera system which acquires and utilizes stereoscopic images from two different camera modules, the main-camera module and the sub-camera module. Hybrid stereoscopic camera can effectively reduce the price and the size of a stereoscopic camera by using a relatively small and cheap sub-camera module such as a mobile phone camera. Images from the two different camera modules are very different from each other in aspects of color, angle of view, scale, resolution and so on. The proposed system performs an efficient hybrid stereoscopic image registration algorithm that transforms hybrid stereoscopic images into normal stereoscopic images based-on camera geometry. As experimental results, the registered stereoscopic images and applications of the proposed system are shown to demonstrate the performance and the functionality of the proposed camera system.

• Journal of Satellite, Information and Communications
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• v.7 no.3
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• pp.1-7
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• 2012

In this paper, we was performed the interference analysis to determine an optimal coexisting criteria for the european digital video broadcasting service (DVB-T2) and the IMT-advanced LTE based TV Band Device (TVBD). The TVBD was equipped with the spectrum cognition method. To this end, we set the various transmission parameters, that includes the emission and blocking mask, antenna height and gain, transmission power and bandwidth, channel model etc. Based on this parameters, we were calculated the allowable transmit power, the number of TVBD and the change in probability of interference for the TVBD user operating in the adjacent channels of the DVB-T2 user. Also this paper presents how many TVBD users can sharing with DVB-T2 for spectral cognition performance.

• Journal of the Korean Academic Society of Industrial Cluster
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• v.4 no.1
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• pp.1-13
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• 2010

The T-DMB which was developed by the convergence of digital broadcasting technology and communication technology provides us with very good quality of music like CD, and provides TV services in a super express train like the KTX whose velocity is over 300 Km per hour. The T-DMB is diffusing toward the world as a technology which is be able to provide the various convergent services of broadcasting and communication through mobile phone, PDA, dedicated terminal, and so on. A business model needed for the diffusion of the T-DMB toward the world was established and utilized to expand the T-DMB into Vietnam in the paper. In addition, this paper describes a case for the establishment of the T-DMB system in order to provide the paid services in Vietnam. It is expected that the expansion of the T-DMB into Vietnam will make a great contribution to the diffusion of the T-DMB toward the world.