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      • SCOPUSKCI등재

        요소수지합판(尿素樹脂合板)의 증량에 관한 연구

        김용재,이필우,김은변 한국목재공학회 1976 목재공학 Vol.4 No.1

        This study was carried out to know the adaptability of barley flour, potato flour and white ash as extender and filler of urea-formaldehyde resin for plywood as a substitute material of wheat flour. The extenders and filler used at this study were extended by several groups of percentages. Shear strength, moisture contents, and specific gravities were compared among tested groups. The results obtained are summarized as follows. I) Wet and dry shear strength of plywoods extended by 10% barley flour, 30% potato flour, and wheat flours were shown better results than non extended plywoods. 2) There was no significant difference between plywoods extended until 50% barley flours and non extended plywoods. 3) Shear strength of plywoods extended by 50% potato and 100% barley flours were shown worse result than non extended. 4) Dry and wet shear strength of plywoods extended by white ash were shown worst result. 5) The plywoods extended by potato flours were shown nat only better shear strength, but also considered more profitable cost for extending.

      • KCI등재

        보행자보호 시험용 Flex-PLI의 특성 및 소형차 대응 구조 연구

        김용재,진욱,김동선,Kim, Yong Jae,Jin, Wook,Kim, Dong Sun 한국자동차안전학회 2012 자동차안전학회지 Vol.4 No.2

        In 2014 Flex-PLIfor the pedestrian protection will be applied to NCAP test. The most significant feature of Flex-PLI is constructed with segmental bone cores for the femur and tibia regions. So it can be more reproducible by representing pedestrian injuries such as knee ligament and tibia injury during the pedestrian crash against vehicle. In this paper, Analyzed the characteristics of Flex-PLI through the structural analysis and the test results by using Flex-PLI for our compact vehicles. Finally countermeasures into compact vehicle were proposed to fulfill the injury criteria of Flex-PLI.

      • KCI등재

        MPEG-2 에서 H.264로의 Transcoding 과정에서 정수 변환 계수를 이용한 효율적인 인트라 예측 모드 결정 방법

        김용재,이창우 한국통신학회 2008 韓國通信學會論文誌 Vol.33 No.12

        The H.264/AVC video coding standard shows extremely higher coding efficiency, but it causes high computational complexity. Especially, the intra mode decision using the rate-distortion method requires many computations. Thus, the efficient intra mode decision methods have been proposed by decreasing the encoding complexity. In this paper, we propose an efficient intra mode decision algorithm using 4×4 integer transform coefficients in the conversion of MPEG-2 to H.264 standard. It is shown that the proposed algorithm reduces encoding time and complexity compared to the conventional algorithm, while showing similar PSNR performance. H.264/AVC 비디오 부호화 표준은 높은 부호화 효율을 보여주지만, 그에 따른 부호기의 복잡도가 증가 하는 단점이 있다. 특히 비트율-왜곡 최적화 기법을 이용하여 인트라 모드를 결정하는 방법은 부호기의 복잡도를 증가시키는 가장 큰 원인이다. 따라서 부호화 효율을 유지하면서 부호기의 복잡도를 감소시키 는 여러 가지 방법이 제안되고 있다. 본 논문에서는 MPEG-2에서 H.264로의 변환 과정에서 4×4 정수 변 환 계수를 이용하여 효율적으로 인트라 예측 모드를 결정하는 방법을 제안한다. 제안하는 알고리듬을 적 용한 모의실험 결과는 영상의 부호화 성능을 유지하면서 복잡도 및 부호화 수행 시간을 감소시킬 수 있 었다.

      • KCI등재

        남부지방에서 벼 재배형태별 분얼체계 및 수량구성형질의 차이에 관한 연구 II. 출수기와 수량구성형질의 변화

        김용재,신해룡,장강연 한국작물학회 1992 Korean journal of crop science Vol.37 No.6

        이앙기를 달리 하였을때 어린모와 25일묘, 손이앙묘의 출수반응, 수량 및 쌀의 품위차를 알아보고자 금오벼와 팔공벼, 동진벼를 공시하여 4월 20일부터 7월 20일까지 15일 간격으로 7회 이앙하여 시험한 결과를 요약하면 다음과 같다. 1. 광주지방에서 안전출수한계기(8월 27일)로 본 안전이앙한계기는 조생종인 금오벼는 어린모 : 6월 26일, 25일묘 : 7월 1일, 손이앙묘 : 7월 11일이었으며, 중생종인 팔공벼는 어린모 : 6월 21일, 25일묘 : 6월 30일, 손이앙묘 : 7월 10일이었고, 중만생종인 동진벼는 어린모 : 6월 10일, 25일묘 6월 24일, 손이앙묘 : 7월 5일이었다. 2. 육묘방법별 수량은 이앙기에 따라 일정한 경향을 보이지 않았으나 금오벼는 어린모>25일묘>손이앙묘의 순이었으며 팔공벼는 25일묘(equation omitted)어린모(equation omitted)손이앙묘의 순이었고, 동진벼는 손이앙묘(equation omitted)25일묘(equation omitted)어린모의 순으로 증수되었다. 3. 수량생산기(출수전 10일부터 출수후 30일까지)에 있어서 적산온도를 보면 금오벼는 어린모에서 최대수량을 올린 6월 5일~6월 20일 이앙에서 1,003$^{\circ}C$였고, 25일묘에서는 6월 5일~6월 20일 이앙에서 1,014$^{\circ}C$, 손이앙기는 5월 20일~6월 5일 이앙에서 1,027$^{\circ}C$이었으며, 팔공벼에서는 어린모 : 1,018$^{\circ}C$, 25일묘 : 1,015$^{\circ}C$, 손이앙묘 : 1,086$^{\circ}C$ 이었고, 동진벼에서는 어린모 : 998$^{\circ}C$, 25일묘 : 984$^{\circ}C$, 손이앙묘 : 949$^{\circ}C$에서 최대수량을 보였다. 4. 육묘방법에 따른 이앙시기별 쌀의 품위는 금오벼는 어린모에서 조기이앙에 따라 동할미가 많았고 청미가 적었으며 7월 5일 이후의 이앙에서는 청미가 현저하게 많아지면서 동할미도 증가하였다. 팔공벼와 동진벼는 이앙시기간에 차리가 인정되지 않았고 다만 극만식인 7월 5일 이후의 이앙에서만 청미 비율이 높았다. To study the effects of different nursing methods and transplanting on the growth of rice plant (Oriza sativa L.) in southern region of Korea, Kumo-byeo, Palgong-byeo and Dongjinbyeo were transplanted from April 20 to July 20 at an interval of 15 days with 8 days old seedling (infant seedling) and 25 days old box-seedling for machine transplanting, and 45 days old conventional seedling. Threshold transplanting date in southern region of Korea were June 26 for 8 days old seedling, July 1 for 25 days old seedling and] July 11 for 45 days old seedling for Kumo-byeo, and June 21, June 30, July 10 for Palgong-byeo, June 10, June 24, July 5 for Dongjin-byeo, respectively. Yield has no uniform tendency according to the transplanting date. However, yield were greater in the order of 8 days old seedling >25 days old seedling> 45 days old seedling in Kuma-byeo and 25 days old seedling (equation omitted)8 days old seedling (equation omitted)45 days old seedling in Palgong-byeo, 45 days old seedling(equation omitted)25 days old seedling(equation omitted) 8 days old seedling in Dongjin-byeo. The optimum accumulated air temperature during yield productive stage around heading (40 days from 10 days before heading to 30 days after heading) for high yield were 1,003$^{\circ}C$ for 8 days old seedling, 1,014$^{\circ}C$ for 25 days old seedling and 1,027$^{\circ}C$ for 45 days old seedling in Kumo-byeo. And they were 1,018$^{\circ}C$, 1,015$^{\circ}C$, 1,086$^{\circ}C$ in Palgong-byeo and 998$^{\circ}C$, 984$^{\circ}C$, 949$^{\circ}C$ in Dongjin-byeo, respectively. Earlier transplanting with 8 days old seedling showed higher ratio of broken rice and green kerneled rice in Kuma-byeo, and late transplanting after July 5 showed significant high rate of green kerneled rice. Palgong-byeo and Dongjin-byeo also showed high rate of green kerneled rice at transplanting after July 5.

      • Radical Endoscopic Antrum Surgery for the Treatment of Pediatric Sinusitis

        김용재,이상훈 대한비과학회 1998 Journal of rhinology Vol.5 No.2

        Background:The follow-up results of traditional surgical methods have yielded less positive results with children than theyhave with adults. The maxillary sinuses are commonly affected by residual mucosal diseases, so an endoscopic nasal examinationfrequently reveals recurrent polyposis. Irreversibly diseased maxillary sinus mucosa exhibiting polyposis and thickening can easilybe accessed and extirpated endoscopically. The endoscopic approach of examining the maxillary sinuses is also the easier routewhen treating younger children. Subjects and Methods:Under study were eight cases of rhinosinusitis in children aged betweenthree and fifteen years old. The patients had been unresponsive to medical treatment with antibiotics for more than three consecutivemonths but were successfully treated with radical endoscopic antrum surgery (REAS) performed with the endoscopicethmoidectomy procedure. Results:Compared to outcomes associated with conventional functional endoscopic sinus surgery(FESS), the results remained excellent during follow-ups of more than six months. Postoperative endoscopic examinations andCT scans showed air-filled antrum spaces, and resultant delays in the development of the maxillary sinus were slight (13%) whencompared with the contralateral side after FESS. Conclusion:The immediate outcome of REAS suggests success, but untowardeffects on growth of the facial bone should be evaluated with follow-up observations over the long term.

      • Orbital Complications of Rhinosinusitis: Characteristics in Pediatric Patients

        김용재,민양기 대한비과학회 2000 Journal of rhinology Vol.7 No.2

        To evaluate the differences in clinical features of rhinosinogenic orbital complications between the pediatric and adult groups,a multicenter survey was made on 79 cases of rhinogenic orbital complications (from January 1985 through October 1999). The patients ranged in age between 8 months and 79 years with a mean of 28 years. Thirty-five patients were under 15 years ofage (pediatric group), and 44 patients were over 15 years of age (adult group). Twenty-three of 35 pediatric patients (65.7%)had postseptal orbital inflammation, whereas 30 of 44 adult patients (68.2%) had postseptal orbital inflammation. The pediatricgroup had shorter symptom duration than the adult group. Pediatric OCRS also developed as various forms-inflammatoryedema, orbital cellulitis, orbital abscess and subperiosteal abscess. Sixteen of 35 pediatric patients (45.7%) underwent surgicalinterventions. The cure rate by surgical interventions in the pediatric group (14/16, 87.4%) was higher than that in the adultgroup (21/26, 80.8%). The cure rate by medical treatment in the pediatric group (18/19, 94.7%) was also higher than that inthe adult group (11/16, 68.7%).

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