• 한국의상디자인학회지
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• 제8권3호
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• pp.129-143
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• 2006

This study is to review the printed cotton textile industry of Europe in 17th-l8th century, and specially investigate the development of the Toile do Jouy, printed French fabrics around the 18th century. Generally, the Toile de Jouy has two different meanings. The first meaning is the popular printed cotton textiles producted by wood block printing, copper plate printing and roller printing techniques at Jouy on Joas factory in France, around 18th century. The second meaning is the monochromatic upholstery fabrics printed by copper plate. Actually, this monochromatic printed textiles were the most popular printed cotton fabrics with large scale scenic designs with people, trees, birds, buildings, mythical heroes, protagonists of novel and country scenes of shepherds, sheep and other animals manufactured by Jouy on Joas factory. Main issue of this paper is to propose features of pattern, color and classify types of patterns expressed on the Toile de Jouy fabrics according to printing techniques such as wood block printing, copper plate printing and copper roller printing. And this study is also to analyze on origins of the variety of names called the printed cotton textiles in those days. The results of this study can help to understand the knowledge of printed cotton textiles in Europe and be effectively applied to develop printed fabric design in the textile industry.

• 한국콘텐츠학회논문지
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• 제17권3호
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• pp.329-336
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• 2017

비디오 압축에서 움직임 추정 기법은 영상 화질과 발생 비트량에 있어서 중요한 역할을 하지만 많은 계산 복잡도를 요구한다. 다수의 카메라로 촬영한 동영상인 다시점 비디오는 카메라의 수에 비례하여 데이터의 양이 기하급수적으로 증가하기 때문에 움직임 추정에 많은 계산량을 필요하다. 본 논문에서 다시점 비디오의 부호화를 위한 움직임 추정의 계산량을 줄이면서 화질과 비트량을 유지하는 움직임 추정 기법을 제안한다. 제안한 움직임 추정 기법은 움직임 벡터들의 분포 특성과 영상 블록들의 움직임 특성을 이용한다. 제안한 움직임 추정기법은 계층적 움직임 추정 기법으로 대칭형 멀티 마름모 패턴, 대각선 패턴, 사각형 패턴 그리고 정교한 패턴으로 구성되어 있다. 제안한 움직임 추정 기법은 움직임 벡터들과 블록 움직임의 특성들을 이용하여 패턴들의 탐색 점들을 탐색 영역 내에 대칭적으로 배치하고 블록 움직임 크기에 따라 적응적으로 탐색 패턴을 선택하여 움직임 벡터를 추정한다. 제안한 기법의 성능은 JMVC의 고속 움직임 추정 기법인 TZ 탐색 기법과 전역 탐색 기법인 PBS (Pel Block Search)의 성능과 비교한 경우, 영상 화질면에서와 발생 비트량면에서 비슷하지만 움직임 추정에 필요한 계산량을 각각 약 40~75%, 98%감소시킨다.

• The Korean Journal of Pain
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• 제11권2호
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• pp.268-272
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• 1998

Background: Postoperative bleeding is a common complication in transurethral resection of prostate (TURP). Some patients become restless and combative after operation, particularly when in pain, producing bleeding from the prostatic bed. So many patients may be necessary to pain control for reduce bleeding. The purpose of this study is to compare recently used two Methods for post-operative analgesia. Methods: We studied 40 patients, ASA physical staus 1, 2, undergone TURP under general anesthesia. The patients divided into two groups: continuous epidural pain control group (I, n=20) received an epidural bolus of morphine 2 mg and 1% lidocaine 10 ml followed by a epidural 0.08% bupivacaine 40 ml and morphine 4.5 mg (basal infusion rate 0.5 ml/hr), intravenous patient-controlled analgesia (IV-PCA) group (II, n=20) received an intravenous bolus of fentanyl $50\sim100{\mu}g$ followed by a IV-PCA morphine 30 mg, ketorolac 180 mg and droperdol 2.5 mg (basal infusion rate 0.5 ml/hr, bolus 0.5 ml, lock-out interval 15 min). This study conducted the analgesic efficacy, side effect and patient's satisfaction for 1 day after TURP. Results: Continuous epidural pain control group had more significant analgesia than IV-PCA at postoperative 30, 60 min, but no significant difference was observed later in both group. Nausea and pruritus were scantly developed in both group but the incidence was no significant differeance. Patients responded good satisfaction over 70% in both group. Conclusions: Postoperative continuous epidural pain block and IV-PCA are both effective Methods of postoperative pain control with lower incidence of side effects.

• The Korean Journal of Pain
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• 제29권1호
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• pp.29-33
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• 2016

Background: The purpose of this study was to evaluate the effect of dexamethasone or dexmedetomidine added to ropivacaine on the onset and duration of ultrasound-guided axillary brachial plexus blocks (BPB). Methods: Fifty-one ASA physical status I-II patients with elective forearm and hand surgery under axillary brachial plexus blocks were randomly allocated to receive 20 ml of 0.5% ropivacaine with 2 ml of isotonic saline (C group, n = 17), 20 ml of 0.5% ropivacaine with 2 ml (10 mg) of dexamethasone (D group, n = 17) or 20 ml of 0.5% ropivacaine with 2 ml ($100{\mu}g$) of dexmedetomidine (DM group, n = 17). A nerve stimulation technique with ultrasound was used in all patients. The onset time and duration of sensory blocks were assessed. Results: The duration of the sensory block was extended in group D and group DX compared with group C (P < 0.05), but there was no significant difference between group D and group DX. However, there were no significant differences in onset time in all three groups. Conclusions: Dexamethasone 10 mg and dexmedetomidine $100{\mu}g$ were equally effective in extending the duration of ropivacaine in ultrasound-guided axillary BPB with nerve stimulation. However, neither drug has significantly effects the onset time.

• Journal of Communications and Networks
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• 제10권3호
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• pp.239-252
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• 2008

For orthogonal frequency division multiplexing (OFDM), cyclic prefix (CP) should be longer than the length of channel impulse response, resulting in a loss of bandwidth efficiency. In this paper, we describe a new technique to restore the cyclicity of the received signal when the CP is not sufficient for OFDM systems. The proposed technique efficiently restores the cyclicity of the current received symbol by adding the weighted next received symbol to the current received symbol. Iterative CP reconstruction (CPR) procedure, based on the residual intersymbol interference cancellation (RISIC) algorithm, is analyzed and compared to the RISIC. In addition, we apply the CPR method to Alamouti space-time block coded (STBC) OFDM system. It is shown that in the STBC OFDM, tail cancellation as well as cyclic reconstruction of the CPR procedure should be repeated. The computational complexities of the RISIC, the proposed CPR, the RISIC with STBC, and the proposed CPR with STBC are analyzed and their performances are evaluated in multipath fading environments. We also propose an iterative channel estimation (CE) method for OFDM with insufficient CP. Further, we discuss the CE method for the STBC OFDM system with the CPR. It is shown that the CPR technique with the proposed CE method minimizes the loss of bandwidth efficiency due to the use of CP, without sacrificing the diversity gain of the STBC OFDM system.

• 대한전자공학회논문지SP
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• 제43권5호
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• pp.72-78
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• 2006

본 논문은 H.264/AVC 압축 영역에서의 동영상 검색에 관한 것이다. 기존의 동영상 압축 표준인 MPEG-2 및 4와는 달리 H.264/AVC는 다양한 블록 단위의 움직임 보상으로 인해 기존의 MPEG-2 및 4에서 사용되었던 움직임 벡터를 이용한 방법들을 그대로 적용하기 어렵다. 따라서 본 논문에서는 이러한 문제를 해결하기 위해 H.264/AVC의 다양한 블록 크기의 움직임 벡터를 움직임 보상의 최소 단위인 $4{\times}4$ 블록 단위로 분할하고, 각각의 분할된 블록에 동일한 움직임 벡터를 할당하는 방법을 제안한다. 또한, 유사도 측정을 위해 두 영상으로부터 추출한 특징 간의 상관계수를 이용하였다. 실험은 10558 프레임의 MPEG 표준 동영상과 48161 프레임의 일반 동영상을 대상으로 이루어졌으며, 제안한 방법을 이용한 실험을 통해 0.2 이하의 ANMRR 결과를 나타내었다.

• 디지털콘텐츠학회 논문지
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• 제18권7호
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• pp.1323-1331
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• 2017

오늘날 저작권 관련 산업이 사회, 경제적으로 큰 영향을 미치는 대규모 산업으로 성장하였음에도 불구하고 저작물에 대한 소유권 및 저작권에 대한 문제가 끊임없이 발생하고 있으며 특히 이미지 저작권과 관련된 연구는 거의 진행되지 않는 상태이다. 본 연구에서는 기존의 문서 영상처리 기술과 딥 러닝 기술을 융합하여 교육용 도서 영상에서의 객체 자동 추출 및 분류 기술 시스템을 제안한다. 제안된 기술은 먼저 잡음을 제거한 후, 시각적 주의(visual attention) 기반 영역 추출 과정을 수행한다. 추출된 영역을 기반으로 블록화 작업을 수행하고, 각 블록을 그림인지 아니면 문자 영역인지를 분류한다. 마지막으로 추출된 그림 영역 주위를 검색하여 캡션 영역을 추출한다. 본 연구에서 진행한 성능 평가 결과, 그림 영역은 최대 97% 정확도를 보이며, 그림 및 캡션 영역 추출에 있어서는 평균 83%의 정확도를 보여 준다.

• 한국전자통신학회논문지
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• 제11권1호
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• pp.23-28
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• 2016

본 논문에서는 범 세계적으로 이용가능한 다중대역 디지털 위성방송용 Ku-대역 하향변환기를 설계하였다. 설계된 다중대역 하향변환기는 광대역 잡음 정합에 의한 3단 저 잡음 증폭회로와 10.7~12.75GHz의 입력신호를 VCO-PLL에 의한 저 위상잡음을 나타내는 4개의 국부발진주파수(9.75, 10, 10.75 및 11.3GHz)를 형성하고 디지털 제어에 의하여 4개대역 중 하나의 IF 주파수 채널을 선택할 수 있도록 설계하였다. 개발한 저 잡음 하향 변환기의 전체 변환이득 64dB, 저 잡음 증폭기의 잡음지수는 0.7dB, 출력신호의 P1dB는 15dBm, band 1반송주파수 9.75GHz에서 위상잡음은 -73dBc@100Hz를 나타내었다. 설계한 다중대역 디지털 위성방송용 하향변환기(LNB)는 국제적으로 이동하는 선박 등의 위성방송용으로 사용가능하다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2008년도 International Symposium on Remote Sensing
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• pp.418-421
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• 2008

Wenchuan earthquake (Mw 7.9) occurred in Sichuan province, China, May 2008 had resulted in a huge fault displacement around the Lungmenshan fault. Preliminary results of the fault displacement observed by ALOS PALSAR interferometry are presented. The surface deformation by the Wenchuan earthquake was reported up to 10m consisting of thrust- and right-slip compnents. A significant reduction in ionospheric density was also reported. Twenty differential interferograms and twenty multiple aperture SAR interferometry (MAI) pairs were produced over four ALOS tracks. It was observed from differential interferograms that i) LOS deformation decreases steadily from northnorthwest of the Longmenshan fault to the fault, ii) the LOS deformation sharply increases at areas around the fault, and iii) the decrease of the LOS deformation is observed from the Longmenshan fault to the south-southeast of the fault. Horizontal movement of the reverse fault displacement can better be observed by MAI technique, and the MAI phases show that i) the south-southeast directional reverse fault displacement (negative along-track deformation for an ascending track) of the north-northwest block gradually increases to the Longmenshan fault, ii) the reverse fault movement of the south-southeast block is sharply reversed to the north-northwest of the fault, and iii) the northnorthwest movement gradually decreases to the south-southeast of fault. Although the Lonmenshan Fault line is a center of earthquake epicenter, the boundary of surface movement exists to the north-northeast of the fault. Since the ionosphere was not stable even forty days after the mainshock, MAI phases were seriously corrupted by ionospheric effect. It is necessary to acquire more data when the ionosphere recovered to a normal state.

• The Journal of Advanced Prosthodontics
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• 제12권5호
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• pp.251-258
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• 2020

PURPOSE. The bond strengths between resin denture teeth with various compositions and denture base resins including conventional and CAD/CAM purposed materials were evaluated to find influence of each material. MATERIALS AND METHODS. Cylindrical rods (6.0 mm diameter × 8.0 mm length) prepared from pre-polymerized CAD/CAM denture base resin blocks (PMMA Block-pink; Huge Dental Material, Vipi Block-Pink; Vipi Industria) were bonded to the basal surface of resin teeth from three different companies (VITA MFT^®; VITA Zahnfabrik, Endura Posterio^®; SHOFU Dental, Duracross Physio^®; Nissin Dental Products Inc.) using resin cement (Super-Bond C&B; SUN MEDICAL). As a control group, rods from a conventional heat-polymerizing denture base resin (Vertex™ Rapid Simplified; Vertex-Dental B.V. Co.) were attached to the resin teeth using the conventional flasking and curing method. Furthermore, the effect of air abrasion was studied with the highly cross-linked resin teeth (VITA MFT^®) groups. The shear bond strengths were measured, and then the fractured surfaces were examined to analyze the mode of failure. RESULTS. The shear bond strengths of the conventional heat-polymerizing PMMA denture resin group and the CAD/CAM denture base resin groups were similar. Air abrasion to VITA MFT^® did not improve shear bond strengths. Interfacial failure was the dominant cause of failure for all specimens. CONCLUSION. Shear bond strengths of CAD/CAM denture base materials and resin denture teeth using resin cement are comparable to those of conventional methods.