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주입광원에 따른 WDM-PON 에서의 통신 품질 특성 연구
배준기,신현종,이재환 한국정보통신설비학회 2008 한국정보통신설비학회 학술대회 Vol.2008 No.1
We study signal characteristics of the injection-locked Fabry-Perot laser diodes(FP-LDs) for the development of a costeffective WDM-PON solution. The output power and system performance of WDM-PON using injection locked FP-LD are depend on optical characteristics of injection source. The effect of optical power and polarization state of the injection source experimentally investigated. We also measured BER characteristics of the directly modulated FP LD and its power penalty at the BER of 10-9.
정치 캠페인 메시지의 유형과 시간적 거리감이 20대 유권자의 태도 및 투표 의도에 미치는 영향
배준기,황성욱 한국소통학회 2014 한국소통학보 Vol.23 No.-
이 연구는 해석수준이론(construal level theory)을 바탕으로 선거캠페인 메시지의 유 형 및 시간적 거리감이 유권자의 메시지에 대한 태도 및 투표의도에 미치는 영향을 조사하였 다. 또한, 정치 커뮤니케이션 연구의 오랜 논란이었던 긍정과 부정의 어떤 소구방법이 더 효 과적인지도 함께 살펴보았다. 실험방법으로 2 × 2 × 2 구조의 혼합 실험설계(mixedsubjects design)를 이용하였다. 그리고 가설을 검증하기 위해 통계 분석 방법으로 MANOVA분석을 수행하였다. 실험의 주요 결과로는 메시지에 대한 태도와 후보자에 대한 투표 의도에 대한 시간적 거리감(먼/가까운), 메시지 주제(이슈/이미지), 그리고 소구방법 (긍정적/부정적) 세 변인 간의 상호작용을 관찰할 수 있었다. 다시 말해 응답자들은 시간적 거리감이 먼 이미지 메시지, 시간적 거리감이 가까운 이슈 메시지를 선호하였고 전체적으로 부정보다는 긍정의 메시지를 호의적으로 평가하였다. 이러한 결과를 바탕으로, 이론적 함의 및 선거 캠페인 관계자들에게 유용한 실용적 함의를 토론하였다. Based on the Construal Level Theory(CLT), this experimental study examined the effect of political campaign message type and temporal distance on respondents' attitudes toward the message and the voting intention of candidates. In addition, this study investigated the effect of positive and negative message appeal on dependent variables. This study utilized the mixed-subjects design with 2 × 2 × 2 structure and performed MANOVA analysis. This study found the interaction effect of temporal distance (distant vs. near), message type (issue vs. image), and message appeal (positive vs. negative) on attitudes toward the message and the voting intention of candidates, which supported the proposed hypotheses. That is, the respondents favorably evaluated temporally distant image message and near issue message. The respondents overall preferred positive messages to negative ones. Based on the results, this study discussed theoretical and practical implications for political campaign practitioners.
배준기 대한영상의학회 1998 대한영상의학회지 Vol.38 No.3
Purpose : The purpose of this study was to report the sonographic findings of neonatal coccygeal abscess,previously not described. Materials and Methods : Eighteen neonates (5-18 days old) presented with swelling in thecoccygeal area and by either open drainage (n=13) or follow-up after antibiotic therapy (n=5), this was diagnosedas coccygeal abscess. We retrospectively reviewed the size, shape, location, echo pattern and marginalcharacteristics of the abscesses, as seen on sonography, as well as their intradural content and relationship withthe spine. Additional MR images (n=5) were separately reviewed. Results : Mean longest diameter of the abscesseswas 1.5cm (range, 0.8-2.3); they were oval or round and located in the subcutaneous fat layer. Echogenicitycompared with surrounding fat varied: in nine patients it was isoechoic, and in nine, hypoechoic. Internalechogenicity was homogenous in 14 patients and heterogeneous in four, and in seven cases, the margin of theabscess was well demarcated. Intradural structure and bony spines were normal, and the possibility of spinaldysraphism, could thus be excluded. All cases except one were correctly diagnosed by sonography and clinicalfindings; on sonography, the echogenicity of one lesion was exactly the same as that of lipoma, and it was thusmisdiagnosed. In cases where sonography revealed an isoechoic mass, the use of MR excluded the possibility oflipoma. Three of five cases showed marginal or diffuse enhancement on contrast enhanced MR images. Conclusion :Coccygeal absesses were confined to the subcutaneous fat layer and were either iso- or hypoechoic compared. withsurrounding fat. In neonates, abscess formation in the coccygeal area is possible, and coccygeal abscess shouldtherefore be included in the differentiation of coccygeal masses.
배준기 대한영상의학회 1996 대한영상의학회지 Vol.34 No.5
Purpose: To analyse and interpret different sonographic findings in acute nonperforated and appendicitis.Materials and Methods: In 46 cases of acute appendicitis in children(26 girls, 20 boys) proven by surgery, sonographic findings were reviewed retrospectively. The findings of nonperforated and perforated appendicitis were analysed, focusing on the size, shape and echogenicity of the appendix, echo patterns of periappendiceal abscesses, mesenteric lymphadenopathy, and the prevalence of appendicolith. Results: A noncompressible distended appendix was present in 18 of 21 patients with nonperforated appendicitis and in 13 of 25 patients with perforation. In 18 patients with nonperforated appendicitis, the average diameter of distended appendix was 8.6mm;target appearance was noted in 16 patients and loss of echogenic submucosa in two. In 13 patients with perforated appendicitis, the average diameter of appendix was 9.1 mm;target appearance was noted in four patientsand loss of echogenic submucosa in nine. Periappendiceal abscesses were present in 21 of 25 cases of perforated appendicitis, and the echogenicity of abscesses was mixed in 12 patients, hypoechogenic in eight, and hyperechogenic in one. Mesenteric lymphadenopathy was present in two of 21 patients with nonperforated appendicitis and in four of 25 with perforation. Appendicolith was detected on sonography in three of 25 patients with perforated appendicitis, but was found in seven patients during surgery. One patients with perforated appendicitis also had right side hydronephrosis. Sonographically false-negative results were obtained in six cases. Conclusion : A sonographic examination was useful to differenciate perforated and nonperforated appendicitis in children. Loss of echogenic submucosa in the distended appendix and periappendiceal abscess formation were important findings in diagnosis of perforated appendicitis.
향상된 비트 평면 분할을 통한 다중 학습 통합 신경망 구축
배준기(Joon-ki Bae),배성호(Sung-ho Bae) 한국방송·미디어공학회 2020 한국방송공학회 학술발표대회 논문집 Vol.2020 No.7
본 논문에서는 직전 연구였던 비트 평면 분할과 디더링을 통한 다중 학습 통합 신경망 구축에서의 한계점을 분석하고, 향상시킨 방법을 제시한다. 통합 신경망을 구축하는 방법에 대해 최근까지 시도되었던 방법들은 신경망을 구성하는 가중치(weight)나 층(layer)를 공유하거나 태스크 별로 구분하는 것들이 있다. 이와 같은 선상에서 본 연구는 더 작은 단위인 가중치의 비트 평면을 태스크 별로 할당하여 보다 효율적인 통합 신경망을 구축한다. 실험은 이미지 분류 문제에 대해 수행하였다. 대중적인 신경망 구조인 ResNet18 에 대해 적용한 결과 데이터셋 CIFAR10 과 CIFAR100 에서 이론적인 압축률 50%를 달성하면서 성능 저하가 거의 발견되지 않았다.