• 한국컴퓨터정보학회논문지
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• 제14권3호
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• pp.217-226
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• 2009

본 연구는 한국우정의 우편물류통합정보시스템(PostNet)의 구축 사례를 통하여 정보시스템 통합의 단계별 추진과정과 성공적인 실행동인을 살펴보고자 하는데 그 목적이 있다. PostNet은 조직상의 통합(조직구조 개편), 전략적 통합(업무처리절차 재설계), 기술적 통합(데이터통합, 어플리케이션통합, 통합플렛폼 구축)을 상황적으로 고려하여 정보시스템 통합을 수행하였다. 또한 통합과정에서 세 가지 측면의 통합을 목적에 맞게 연계되도록 구현하였다. PostNet은 기존에 물리적 통합 및 하드웨어 통합의 단계에 머물러 있던 정보시스템 통합의 수준을 경영 목표, 운영 목표와 일치시키도록 진일보시켰다는데 큰 의의가 있다. 한국우정은 물류산업 내에서 최대의 물류망, 조직 서비스를 보유하고 있다 따라서 본 논문의 결과는 향후 정보시스템 통합의 이론적 근거의 틀을 제시할 뿐 아니라 특히 물류시스템 통합에 대한 가이드라인으로 활용될 수 있을 것이다.

• 한국산림과학회지
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• 제98권1호
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• pp.55-65
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• 2009

부속서I국가의 Post-2012 LULUCF 협상을 위해 2008년 8월 가나 아크라에서 개최된 AWG-KP 회의에서 교토의정서 제1차 공약기간에 적용된 gross-net 탄소계정 방법을 개정하기 위한 4가지 협상 대안(gross-net, net-net, 베이스라인 설정, 토지기반 탄소계정 방법)을 결정하였다. 본 연구는 베이스라인 설정 방법을 제외한 3가지 대안에 대해 보고방식, 할인율과 배출권 인정 상한량(cap)에 따라 4가지 대안 시나리오를 설정하여 국가 간 산림 탄소배출권(RMU)을 추정 비교하였다. 교토의정서 3.4조 활동을 현재의 자발보고에서 의무보고로 개정할 경우 러시아, 호주, 뉴질랜드 및 잠재적으로 캐나다도 RMU의 손실이 클 것으로 추정되었다. net-net 및 토지기반 탄소계정 방법은 기준연도 또는 기준기간에 따라 RMU 차이가 큰데, 장령림이 많은 국가는 기준 연도 또는 기준 기간이 공약기간과 가까울수록 RMU가 감소하였다. 모든 국가는 산림경영 활동에 대한 현재의 85% 할인율을 낮출수록 RMU는 증가하였다. 신규조림 및 재조림의 잠재력이 낮은 우리나라는 할인율의 변화에 RMU가 가장 민감하게 변화하였다. 향후 Post-2012 LULUCF 협상은 gross-net 탄소계정 방법과 교토의정서 3.4조 활동의 자발보고라는 현행 탄소계정 체계의 승계가 유력할 것으로 전망된다. 다른 탄소계정 방법은 국가 간 이해관계가 크고 신뢰할만한 방법론 개발에 많은 비용과 시간이 요구된다는 측면에서 채택될 가능성이 낮다. Post-2012 온실가스 의무감축에 참여에 대비하여 우리나라는 기존 선진국과는 다른 차별화된 협상 전략이 필요한데, 특히 산림경영 활동에 대한 할인율을 낮추는 것이 유력한 대안이 될 수 있다.

• 한국포장학회지
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• 제26권2호
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• pp.61-69
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• 2020

As post-harvest processes of onions are carried by a 20 kg-net package which results in high-cost and low-efficiency, especially, the insufficient drying and physical damage of onions after harvesting leads to a huge second loss in storage, we had developed a low-cost, high-efficiency post-harvest bulk handling machinery system by collecting onions on a farm using ton-bags, drying with forced air circulation, and sorting/packaging. The post-harvest bulk handling machinery system consisted of 6 devices, and this study designed an automatic feed hopper with a feeding rate control device, an inclined belt conveyor with a two-step chute, and an automatic pallet unloading device for feeding onions into the sorting/packing line. This study also analyzed the performance and control of the total system. The device had 1-ton handling capacity, but the operational condition was set to increase the capacity. The three-step filling method of pallet by the velocity control of the inclined belt conveyor was applied in the post-harvest bulk handling machinery system for the prevention of physical damage. If one worker was set to operate the total system, the time required to complete one palletized load was approximately 5 minutes and 5 seconds. The calculated daily handling capacity was approximately 94 tons, when the daily actual working time was 8 hours. When the developed system was applied to the managerial size of 2,000 ton, the processing cost per ton of the system was decreased by 19.5%, compared with the existing 20 kg-net package-based handling. The developed post-harvest bulk handling machinery system would be a good substitute for the rapid decline and aging of rural labor.

• 대한임베디드공학회논문지
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• 제13권6호
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• pp.313-319
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• 2018

We propose a post-processing algorithm to improve the quality of the RGB image generated by deep learning based colorization from the gray-scale image of an infrared camera. Wavelet fusion is used to generate a new luminance component of the RGB image luminance component from the deep learning model and the luminance component of the infrared camera. PSNR is increased for all experimental images by applying the proposed algorithm to RGB images generated by two deep learning models of SegNet and DCGAN. For the SegNet model, the average PSNR is improved by 1.3906dB at level 1 of the Haar wavelet method. For the DCGAN model, PSNR is improved 0.0759dB on the average at level 5 of the Daubechies wavelet method. It is also confirmed that the edge components are emphasized by the post-processing and the visibility is improved.

• 한국정보통신학회논문지
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• 제8권5호
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• pp.1129-1133
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• 2004

정보통신부에서는 우편, 보험, 금융, 전파 등에 관련된 온라인 업무를 처리하기 위해 약 3,010회선의 기반망을 운영하고 있으나 서비스 대역의 유연성 미흡으로 대역폭 낭비요인이 발생하고 있다. 따라서 본 연구에서는 정보통신부 기반망에 대한 경제성 및 효율성 등에 대한 비교ㆍ분석을 통해 제 3 단계 정보통신부 기반망 운영개선 방안을 수립하였다. 본 연구 결과를 토대로 정보통신부 기반망 운영정책을 추진할 경우 금융기관으로서의 이미지가 제고되고 차별화된 정부기관으로서의 신뢰성과 안전성을 바탕으로 수준 높은 서비스를 제공 할 수 있을 것으로 판단된다.

• 대한임베디드공학회논문지
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• 제8권4호
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• pp.185-194
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• 2013

Abstract- In distant-talking environments, speech recognition performance degrades significantly due to noise and reverberation. Recent work of Michael L. Selzer shows that in microphone array speech recognition, the word error rate can be significantly reduced by adapting the beamformer weights to generate a sequence of features which maximizes the likelihood of the correct hypothesis. In this approach, called Likelihood Maximizing Beamforming algorithm (Limabeam), one of the method to implement this Limabeam is an UnSupervised Limabeam(USL) that can improve recognition performance in any situation of environment. From our investigation for this USL, we could see that because the performance of optimization depends strongly on the transcription output of the first recognition step, the output become unstable and this may lead lower performance. In order to improve recognition performance of USL, some post-filter techniques can be employed to obtain more correct transcription output of the first step. In this work, as a post-filtering technique for first recognition step of USL, we propose to add a Wiener-Filter combined with Feature Weighted Malahanobis Distance to improve recognition performance. We also suggest an alternative way to implement Limabeam algorithm for Hidden Markov Network (HM-Net) speech recognizer for efficient implementation. Speech recognition experiments performed in real distant-talking environment confirm the efficacy of Limabeam algorithm in HM-Net speech recognition system and also confirm the improved performance by the proposed method.

• Nuclear Engineering and Technology
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• 제47권4호
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• pp.407-415
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• 2015

A developing post-dryout region is characterized by significant heat transfer enhancements compared with the fully developed post-dryout region. The heat transfer enhancements are mainly due to upstream disturbance and entrained droplets in the region immediately downstream of the critical heat flux location. In this paper, an improved heat transfer correlation is developed for the developing post-dryout regions in vertical tubes over a wide range of flow conditions. The correlation represents a correction factor for the fully developed film-boiling look-up table to be applied to the developing post-dryout region. The new correlation significantly improves the heat transfer prediction in the developing post-dryout regions and provides very good agreement with the experimental data.

• Journal of information and communication convergence engineering
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• 제7권3호
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• pp.372-376
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• 2009

In this paper, new and simple optical transmission link with fixed dispersion management (DM) scheme, i.e., pre(post) compensation and residual dispersion per span (RDPS) are fixed to net residual dispersion (NRD) = 0 ps/nm, and optical phase conjugator (OPC) having optimal position depending on launch power in WDM transmission system is proposed. Also, effective launch power range of WDM channels resulting 1 dB eye opening penalty (EOP) is induced as a function of OPC position. First, it is confirmed that, for applying DM into WDM transmission link fixed pre(post)compensation and RDPS, which are independence on exact system parameters except launch power, sufficiently are used in WDM links, but OPC with optimal position is needed for effective compensating impairments of WDM channels. And, it is confirmed that effective launch power is broader in case of RDPS = 100 ps/nm than in RDPS = 50 ps/nm. But, it is shown that the best OPC position offset is -0.6 km from a point of view of power window, which is defined as difference between maximum and minimum effective launch power.

• 대한기계학회논문집A
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• 제26권10호
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• pp.2096-2103
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• 2002

Cold ironing, as a post-forging operation of warm forged gears, needs a clear understanding of form errors due to die-elasticity and springback of component. In order to simplify the analysis of cold ironing, a single tooth instead of a whole gear component was investigated. The influence of initial surface roughness, die design, and die/workpiece interference has been examined experimentally and numerically. As a result the changes in geometrical profile, dimensions, and surface finish in a single tooth were observed. This study demonstrates that predicted dimensions can be achieved and surface finish also can be greatly improved.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2011년도 춘계학술대회
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• pp.536-538
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• 2011

색 분산과 자기 위상 변조 (SPM; self-phase modulation)를 보상하기 위해 분산 제어 (DM; dispersion management)와 광 위상 공액기 (OPC; optical phase conjugator)가 적용된 전송 링크를 통해 160 Gbps OPDM 신호를 양호하게 전송할 수 있는 전체 잉여 분산량 (NRD; net residual dispersion)을 도출하였다. 160 Gbps OTDM 신호 전송을 위해서는 거의 완벽한 잉여 분산 제거가 필요한 것을 확인하였다.