• Journal of the Institute of Convergence Signal Processing
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• v.5 no.4
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• pp.325-332
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• 2004

In this paper, we propose a new DSSS-QPSK baseband modem receiver structure. A general receiver consists of matched filter, do-spreader, and DLL(Delay Locked Loop). In this paper, the matched filter plays a role of the do-spreader using the structure similarities between the matched filter and the de-spreader. As a result of the new receiver architecture, we can reduce the computational expenses and get the simpler receiver structure. This result can be used as an important part in designing the high speed modem. And, through the computer simulation and the experiment with the proposed architecture, we show that the proposed receiver structure yields fast operation speed and simple overall architecture.

• Journal of the Institute of Convergence Signal Processing
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• v.3 no.4
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• pp.1-6
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• 2002

Generally, most significant information of images is included in the object regions. Thus, this paper proposes the object regions prior transmission method using the bidirectional round filter. The proposed method extracts the object regions, and then transmits the wavelet coefficients of the object regions, prior to others, in the encoding procedure using SPIHT So, it makes significant image information be restored faster than others for a short time. Consequently, through the proposed method the significant information of images is able to be recognized at a low bit rate and the condition of the continuous transmission is decidable by recognizing significant information fast, so that the searching time and efficiency can be improved.

• Journal of the Institute of Convergence Signal Processing
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• v.19 no.4
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• pp.186-191
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• 2018

As influence of the 4th industry is growing with development of information society more electronic devices and sensor are used in the field. As this is the case, importance of signal processing during data transfer is rising Furthermore, the need for technology to remove noise caused by various reasons and to stabilize sensor output is growing as well. This research suggests digital filter algorithm that efficiently remove noise by stabilizing output of accelerating sensor. The standard value of this algorithm is calculated by applying Gaussian coefficient. To maintain its feature, final output is obtained by subtracting weight depending on variance from standard value For its evaluation, it is compared with other protocols and its function is checked through output features.

• The Journal of the Korea institute of electronic communication sciences
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• v.16 no.1
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• pp.109-116
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• 2021

Since RDF (Resource Description Framework) triples are modeled as graph, we cannot directly adopt existing solutions in relational databases and XML technology. In order to store, index, and query Linked Data more efficiently, we propose a convergence indexing method combined R*-tree and K-dimensional trees. This method uses a hybrid storage system based on HDD (Hard Disk Drive) and SSD (Solid State Drive) devices, and a separated filter and refinement index structure to filter unnecessary data and further refine the immediate result. We perform performance comparisons based on three standard join retrieval algorithms. The experimental results demonstrate that our method has achieved remarkable performance compared to other existing methods such as Quad and Darq.

• Applied Chemistry for Engineering
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• v.34 no.1
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• pp.80-85
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• 2023

New yellow quinoline-dione dye derivatives were designed and synthesized for use in image sensor color filters. The synthesized compounds have a basic chemical structure composed of quinoline and dione groups. New materials were evaluated on the basis of their optical and thermal properties under conditions mimicking those of a commercial device fabrication process. A comparison of their related performances revealed that, between the two prepared compounds, 2-(3-hydroxyquinolin-2(1H)-ylidene)-1H-indene-1,3(2H)-dione (HQIDO) exhibited the superior performance as an image sensor color filter material, including a solubility greater than 0.5 wt% in propylene glycol monomethyl ether acetate solvent and a high decomposition temperature of 298 ℃, respectively. The results suggest that HQIDO can be used as a yellow dye additive in an image sensor colorant.

• Journal of the Korea Convergence Society
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• v.7 no.6
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• pp.7-11
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• 2016

Voice recognition systems which use a white noise and voice recognition environment are not correct voice recognition with variable voice mixture. Therefore in this paper, we propose a method using the convergence of Bayesian technique and selecting voice for effective voice recognition. we make use of bank frequency response coefficient for selective voice extraction, Using variables observed for the combination of all the possible two observations for this purpose, and has an voice signal noise information to the speech characteristic extraction selectively is obtained by the energy ratio on the output. It provide a noise elimination and recognition rates are improved with combine voice recognition of bayesian methode. The result which we confirmed that the recognition rate of 2.3% is higher than HMM and CHMM methods in vocabulary recognition, respectively.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2017.06a
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• pp.91-94
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• 2017

본 연구에서는 Component-Substitution (CS)기반 영상 융합 방법 중 가장 빠른 처리 속도를 보이는 IHS 기법의 분광 왜곡 현상을 해결하기 위하여 히스토그램을 통해 분광 왜곡 현상을 분석하고 평균 필터링을 통해 분광 왜곡 현상을 해결한다. 제안하는 방법의 성능 평가를 위하여 아리랑 3 호로 촬영한 서울 지역 위성 영상에 IHS 방법과 제안하는 방법을 적용하여 주관적으로 비교하고 객관적으로는 Q4, SAM, ERGAS 의 지표를 사용하여 비교한다. 주관적 비교 결과 제안하는 방법이 분광 왜곡을 감소시킴을 보이며, 객관적 비교 결과 IHS 기법 대비 향상된 Q4, SAM, ERGAS 을 보인다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2011.07a
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• pp.406-409
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• 2011

최근 방송과 통신의 융합으로 방송 통신 융합형 서비스가 활발해지고 있고, 사용자의 요구사항이 높아지고 있는 가운데 무선 채널을 이용한 인터랙티브 비디오 스트리밍 서비스는 가장 큰 서비스로 자리 잡고 있다. 인터랙티브 비디오 서비스중 하나인 파노라마 비디오는 기존의 고정적인 시청환경을 사용자가 능동적으로 선택할 수 있다는 측면에서 발전의 가능성이 큰 분야 중 하나이다. 하지만 넓은 시점을 가진 파노라마 비디오는 높은 대역폭이 요구된다는 단점이 있다. 이에 본 논문은 사용자가 파노라마 비디오 서비스를 받을 때 시청 시점을 변경시키면서 사용되는 비트율을 시공간적 필터를 사용하여 줄일 수 있는 방법을 제안한다. 이를 이용하여 고 대역폭 사용이 불가피한 파노라마 비디오 스트리밍 서비스의 요구 대역폭을 줄임으로서 인터렉티브 비디오의 스트리밍 서비스분야에서 효율적인 대역폭 사용을 위한 기술로 사용될 수 있음을 확인 할 수 있다.

• Convergence Security Journal
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• v.5 no.3
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• pp.33-41
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• 2005

Information can be leaked, changed, damaged and illegally used regardless of the intension of the information owner. Intrusion Detection Systems and Firewalls are used to protect the illegal accesses in the network. But these are the passive protection method, not the active protection method. They only react based on the predefined protection rules or only report to the administrator. In this paper, we develop the intrusion detection and protection system using Netfilter framework. The system makes the administrator's management easy and simple. Furthermore, it offers active protection mechanism against the intrusions.

• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2006.06a
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• pp.37-40
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• 2006

FM(Frequency Modulation) 음 합성방식은 오랫동안 연구되어 왔고 여러 가지 효과를 주기에 유용하고 비교적 낮은 사양으로 높은 수준의 배음을 합성할 수 있지만 그 응용분야가 대부분이 서양악기 위주의 연구였다. 이에 본 논문에서는 국악 관악기인 피리를 주파수 영역에서 저주파 영역과 고주파 영역으로 나누어 분석하고 이 결과를 이용하여 FM 파라미터를 추출하고 비대칭 FM합성방식으로 1차적인 소리를 합성하였다. 분석된 저주파 영역과 고주파 영역의 특성을 각각의 역 필터링을 위한 2개의 필터를 설계하여 이를 다시 합성된 소리를 통과시켜 두 소리를 합산함으로써 더욱 원음과 유사한 소리를 합성할 수 있었다.