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打擊速度 및 溫度變化가 豫크랙을 가진 衝擊試驗片의 動的破壞靭性에 미치는 影響
兪在煥,李敬奉,金重吉,李致雨,吳世旭 慶南大學校 附設 工業技術硏究所 1989 硏究論文集 Vol.7 No.-
計裝化衝擊試驗에서 打擊速度와 溫度의 變化가 豫크랙을 揷入한 衝擊試驗片의 動的破壞靭性에 미치는 影響을 考察한 結果 다음을 알 수 있었다. 豫크랙을 揷入한 試驗片이 V-노치 試驗片에 比하여 實驗値의 分散度가 적으며 0℃以下의 溫度領域에서 動的破壞靭性의 有效性이 있었다. 또한 打擊速度와 實驗溫度의 影響은 溫度가 速度보다 훨씬 上廻하는 傾向이었다. The effect of various impact velocity and temperature on dynamic fracture toughness is tested with precracked Charpy specimen, and conclude following results. Precracked specimen has less dispersion of test results than V-notched specimen, unstable crack initiation load didn't agreed to maximum load at room temperature but at 0℃ below, thus, the availability of dynamic fracture toughness is relatively high. Comparing V-notched specimen, the precracked Charpy specimen represented lower shelf of temperature different. But, at this time, the absorbed energy is estimated equivalently. With the decrease of temperature, the reduction of fracture toughness was obvious, but the effect of impact velocity didn't appear.
포도종실 추출물이 Methylcellulose 필름 성질에 미치는 영향
유승모,박준서,정하열,심재용,김병호,박장우 한국산업식품공학회 2003 산업 식품공학 Vol.7 No.4
The film with methylcellulose(MC) and grape seed extract(GSE) were prepared by casting their aqueous solution at 80℃ and drying at 23℃ for 48 hrs. Effect of grape seed extract(GSE) on the barrier permeabilities and the thermomechanical property of methylcellulose(MC) film was studied. The barrier permeabilities and the thermomechanical property of MC film containing various contents of GSE were evaluated in terms of water vapor, oxygen permeabilities, and dynamic mechanical analysis(DMA). The rate of water vapor permeability of MC film decreased with GSE contnets in the MC films. Also, the rate of oxygen permeability also decreased with GSE contents indicating higher oxygen barrier property of MC film. The results showed that GSE had a good miscibility with MC and acted as a plasticizer for MC film resuling in lowering the glass transition temperature of the film.
유재우 江南大學校産學技術硏究所 2004 산학기술연구소논문집 Vol.- No.18
이 논문은 산업체의 중요한 데이터로 활용되고 있는 인체치수의 검정방법에 대하여 서술하였다. 인체치수는 일반적으로 평균과 표준편차, 그리고 1%., 5%., 50%., 90%., 95%.의 값을 활용하고 있다. 그러나 인체치수는 그 특성상 보편적으로 일정한 범위 내에서 분포하며, 인체치수의 측정과 입력과정에서 생겨나는 측정의 오류와 입력의 오류에 의하여 데이터 전체에 치명적인 영향을 미치게 된다. 이러한 데이터의 검정을 위하여 개별적인 데이터를 하나하나 검정을 하더라도 정확히 오류를 찾아내기 어려울 뿐만 아니라, 검정을 위해 엄청난 시간을 필요로 한다. 따라서 여기서 제시되는 방법은 인체치수의 비례 및 상호관계를 바탕으로 데이터의 검정을 위한 관계식과 인체치수간의 상관과 회귀관계를 활용하여 체계적으로 이를 검정하는 방법을 제시하였다. 이를 통하여 방대한 양의 데이터를 빠른 시간에 정확히 검정함으로써 데이터의 신뢰성을 높이는데 기여하였다.
최근 8년간 K지방대학병원 응급실로 내원한 치과 응급환자에 관한 임상적 연구
유재하,김종배,김태우,문선재,권혁찬,김승범 大韓顎顔面成形再建外科學會 2001 Maxillofacial Plastic Reconstructive Surgery Vol.23 No.6
The delivery of the proper care to the emergency dental patients is more important in the aspdect of community dental service. To attain such a purpose requires the sacred duty to the training of oral and maxillofacial surgeons. This is a retrospective study on the characteristics of dental injuries and diseases in emergency patients. Ths study was based on a series of 2,649 patients treated as dental emergency patients at K country hospital of medical college, from Jan. 1, 1993, to Dec. 31, 2000. The obtained results were as follows. The trauma(71.6%) was the most frequent cause in dental emergency patients, odontogenic infection and oral hemorrhage were next in order of frequency. The primary interdental wiring and transpalatal wiring were frequent proper methods with rubber drainage for prevention of hemorrhage and infection in the primary care of jaw fracture. The peak incidence(45.0%) about the infection group was occurred in the pulpitis of advanced dental caries, and common treatments were the medication of antibiotics & anagesics and I&D. In the dentoalveolar hemorrhage group, a major cause was postoperative hemorrhage(57.9%) and hemostasis was obtained by pressure dressing, suture and drainage of infected wound. About TMJ disorder group, the peak incidence was showed in the post-traumatic myofascial pain dysfunction syndrome and its primary care was medications(anagesics & sedatives). In the other groups, various irritable specific pains were complained, such as trigeminal neuralgia-form pain, acute stomatitis, chemical burn, terminal stage neuritis of head & nech cancer and their primary care methods were various individually. For the rapid and correct care of the emergency dental disease above, well-trained education should be presented in the intern and resident curriculum of oral & maxillofacial surgery.
유진호,손준영,안재환,박성우,김명수,장혁수 明知大學校 産業技術硏究所 1996 産業技術硏究所論文集 Vol.15 No.-
ATM(Asynchronous Transfer Mode) is a transmission technique for the B-lSDN(Broadband Integrated Service Digital Network). Congestion problems are unavoidable in the ATM networks, since various traffic typos coexist in the networks. The preventive congestion control algorithm is widely used for the real time traffics such as voice and video. The reactive congestion control algorithm works well for the non-real time traffic within a short distance. A mixed traffic control algorithm is proposed, which works either preventively or reactively based on traffic types. The proposed algorithm sets a high and low threshold value at the output buffers and modifies the EPRCA(Enhanced Proportion Rate Control Algorithm) to control loss-sensitive cells. Delay-sensitive cells are handled by the priority control and the UPC(Usage Parameter Control) algorithm. The performance analysis shows that the proposed traffic control algorithm works well for both the VBR(Variab1e Bit Rate) and ABR(Available Bit Rate) traffic with small buffers