• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2017.06a
• /
• pp.40-43
• /
• 2017

본 논문은 딥러닝을 이용하여 대장통과시간(Colon Transit Time, CTT) 검사를 위한 단순복부 X-Ray 영상에서 방사선 비투과성 표지자(Radio-opaque Marker)를 자동으로 검출하는 기법을 제시한다. 대장통과시간 검사는 대장의 운동질환을 평가하는데 있어 가장 기본적인 방법으로 특히 만성 변비증 환자의 병태생리에 따른 유형 분류와 치료 계획을 설정하는데 큰 도움을 주고 있으며, 내과적 또는 외과적 치료 후 평가에도 유용한 검사이다. 대장통과시간 검사는 방사선 비투과성 표지자가 내재되어 있는 캡슐을 복용한 뒤 주기적으로 단순복부 X-Ray 촬영을 통해 구간별로 남아있는 표지자의 수를 세고, 이를 통해 구역별 통과시간을 측정한다. 이 과정에서 판독의가 직접 표지자의 위치 및 개수를 세기 때문에 많은 시간이 필요하게 된다. 따라선 본 논문에서는 이러한 단점을 보완하기 위해 딥러닝 기법을 사용하여 X-Ray 영상 내에서 표지자의 위치를 자동 파악하는 기법을 제시한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2019.06a
• /
• pp.197-198
• /
• 2019

최근 국내 재난유형별 사회재난 발생 현황을 살펴보면 다중밀집시설에 대한 대형화재의 발생 비율이 가장 높은 비율을 차지한다. 이는 대규모 재난 발생에 대한 광범위한 재난정보 전달뿐만 아니라 한정된 지역에 재난정보를 전달하는 방안이 필요함을 시사한다. 현재 지역적 재난정보전달이 가능한 방안으로는 긴급재난문자(CBS) 방식이 있으나, 기술적 한계로 기지국 간의 셀을 그룹화하는 클러스터링 방식으로 전달을 하고 있다. 이로 인해 최소 발령 범위는 시 군 구 단위로 한정할 수밖에 없으며, 재난 발생 지역에서 벗어난 영향이 적은 지역까지 발령하는 문제점들이 존재한다. 본 논문에서는 이러한 문제점을 해결하기 위한 방안으로 건물, 구역 등 한정된 지역에 정보전달을 위한 긴급재난문자 표준 기술에 대해 조사하고 적합한 기술에 대해 논하고자 한다.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.35 no.4A
• /
• pp.371-376
• /
• 2010

This paper presents an efficient demapper architecture based soft-decision using the phase-section for Digital Video Broadcasting via satellite, Second Generation (DVB-S2). To achieve the satisfactory performance under a very low SNR conditions with the efficient hardware resource utilization, we propose a simple soft-decision demapper architecture using comparators to compare the phase of symbols and memories. The proposed architecture can decrease about 81% of the hardware resource, satisfying the BER requirements of DVB-S2. It has been thoroughly verified with an FPGA board and R&S(R)SFU (Rohde&Schwarz SFU-K108) broadcaast test equipment.

• Journal of the Institute of Electronics Engineers of Korea TC
• /
• v.47 no.12
• /
• pp.97-103
• /
• 2010

In this paper, worldwide standards and regulations on in-band/out-of-band emission characteristics of DTV broadcasting equipments are reviewed, and emission mask requirements of several equipment types are analyzed. Out-of-band emission mask draft suitable for DTV repeater is proposed and its usefulness is evaluated and verified in the experiments. Using the proposed standard, small-sized and cost effective DTV repeater can be implemented to broaden DTV broadcasting coverage for digital switchover.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.35 no.8B
• /
• pp.1188-1196
• /
• 2010

In this paper, worldwide standards and regulations on in-band/out-of-band emission characteristics of DMB broadcasting equipments are reviewed, and emission mask requirements of terrestrial low power DMB repeater under 10mW/MHz are analyzed. Out-of-band emission mask drafts suitable for single/multiple block low power repeaters are proposed. Validity and usefulness of the proposed drafts is evaluated and verified in the several experiments. Using the proposed standard, small-sized and cost-effective DMB repeater can be easily implemented to broaden DMB broadcasting coverage by reducing weak signal areas.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.15 no.5
• /
• pp.155-162
• /
• 2015

This paper proposes a deterministic optimization algorithm to solve economic load dispatch problem with quadratic convex fuel cost function. The proposed algorithm primarily partitions a generator with prohibited zones into multiple generators so as to place them afield the prohibited zone. It then sets initial values to $P_i{\leftarrow}P_i^{max}$ and reduces power generation costs of those incurring the maximum unit power cost. It finally employs a swap optimization process of $P_i{\leftarrow}P_i-{\beta}$, $P_j{\leftarrow}P_j+{\beta}$ where $_{max}\{F(P_i)-F(P_i-{\beta})\}$ > $_{min}\{F(P_j+{\beta})-F(P_j)\}$, $i{\neq}j$, ${\beta}=1.0,0.1,0.01,0.001$. When applied to 3 different 15-generator cases, the proposed algorithm has consistently yielded optimized results compared to those of heuristic algorithms.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.20 no.5
• /
• pp.195-205
• /
• 2020

Recently, after the 4th industrial revolution era has arrived, technological advances started to develop and these changes have led to widespread use of data. Big data is often used for the safety of citizens, including the administration, safety and security of the country. In order to enhance the efficiency of maintaining such security, it is necessary to understand the installation status of CCTVs. By comparing the installation rate of CCTVs and crime rate in the area, we should analyze and improve the status of CCTV installation status, and crime rate in each area in order to increase the efficiency of security. Therefore, in this paper, big data analytic system based on public data is developed to collect data related to crime rate such as CCTV, female population, entertainment center, etc. and to reduce crime rate through efficient management and installation of CCTV.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.23 no.3
• /
• pp.99-106
• /
• 2023

In this paper, we propose subregion-based area of interest management techniques for MMORPG(massively multiplayer online role playing games) integrating P2P(peer-to-peer) networking and cloud computing. For the crowded region, the proposed techniques partition it into several subregions and assign a player to manage each subregion as a coordinator. These techniques include a load balancing mechanism which regulates communication and computation overhead of such player below the specified threshold. We also provide a mechanism for satisfying the criterion, where subregions overlapped with each player's view must be switched quickly and seamlessly as the view moves around in the game world. In the proposed techniques where an efficient provisioning of resources is realized, they relieve a lot of computational power and network traffic, the load on the servers in the cloud by exploiting the capacity of the players effectively. Simulation results show that the MMORPG based on cloud and P2P architecture can reduce the considerable bandwidth at the server compared to the client server architecture as the available resources grow with the number of players in crowding or hotspots.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.23 no.6
• /
• pp.171-177
• /
• 2023

When configuring MDM services only with applications without a central control server, a method that allows security control to be released based on GPS signals in areas sufficiently far from the security area of the workplace is generally applied by embedding and distributing location information of workplaces in MDM applications. This study proposed a method in which each individual directly enters the location information of the security control area needed for them in the distributed app and maintains it as setting information without embedding location information of a specific area such as work in the MDM applications. The method proposed in this study can improve universality, compatibility and the security control level of MDM services, and minimize deployment costs.

• The Journal of the Acoustical Society of Korea
• /
• v.27 no.1
• /
• pp.18-25
• /
• 2008

In this paper, new lossless coding method of spectral coefficients for audio codec is proposed. Conventional lossless coder uses Huffman coding utilizing the statistical characteristics of spectral coefficients, but does not provide the high coding efficiency due to its simple structure. To solve this limitation, new lossless coding scheme with better performance is proposed that consists of bit-plane transform and run-length coding. In the proposed scheme, the spectral coefficients are first transformed by bit-plane into 1-D bit-stream with better correlative properties, which is then coded intorun-length and is finally Huffman coded. In addition, the coding performance is further increased by applying the proposed bit-plane coding selectively to each group, after the entire frequency is divided into 3 groups. The performance of proposed coding scheme is measured in terms of theoretical number of bits based on the entropy, and shows at most 6% enhancement compared to that of conventional lossless coder used in AAC audio codec.