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      • KCI등재후보

        전신마취와 Rose 자세가 하비갑개 크기의 변화에 미치는 영향에 대한 연구

        이주형 대한비과학회 2009 Journal of rhinology Vol.16 No.1

        Background and Objectives:Enlargement of the inferior turbinates can be caused by allergic rhinitis, vasomotor rhinitis, or emotional responses. However, the effects of general anesthesia and the Rose position on the enlargement of the turbinates are unknown. The aim of this study is to evaluate the effects of general anesthesia and the Rose position on the size of the inferior turbinates and nasal passage. Materials and Methods:Fifty patients undergoing tonsillectomy with or without adenoidectomy or snoring surgery without nasal pathology from February, 2007 to July, 2007 at a university hospital were included in the study. The size of the inferior turbinates was measured under the following conditions:1) pre-anesthesia in the supine position;2) post-anesthesia in the supine position;3) post- anesthesia, lying in the Rose position, and 4) at the end of the operation 30 to 50 minutes after anesthesia, with endoscopic nasal photographs. Using an acoustic rhinometry, the minimal cross-sectional area of the nasal cavity was, during conditions one and four, listed above, simultaneously. Results: The size of the inferior turbinates was increased statistically in condition three, post-anesthesia, lying in the Rose position, and condition four, at the end of surgery 30 to 50 minutes after anesthesia, compared to condition one, pre-anesthesia lying in the supine position. In addition, the minimal cross-sectional area of the nasal cavity was decreased in condition one compared to condition four. Conclusion:The size of the inferior turbinates was influenced by general anesthesia and the Rose position, presumably due to engorgement of the venous sinuses and/or mucosal edema. Background and Objectives:Enlargement of the inferior turbinates can be caused by allergic rhinitis, vasomotor rhinitis, or emotional responses. However, the effects of general anesthesia and the Rose position on the enlargement of the turbinates are unknown. The aim of this study is to evaluate the effects of general anesthesia and the Rose position on the size of the inferior turbinates and nasal passage. Materials and Methods:Fifty patients undergoing tonsillectomy with or without adenoidectomy or snoring surgery without nasal pathology from February, 2007 to July, 2007 at a university hospital were included in the study. The size of the inferior turbinates was measured under the following conditions:1) pre-anesthesia in the supine position;2) post-anesthesia in the supine position;3) post- anesthesia, lying in the Rose position, and 4) at the end of the operation 30 to 50 minutes after anesthesia, with endoscopic nasal photographs. Using an acoustic rhinometry, the minimal cross-sectional area of the nasal cavity was, during conditions one and four, listed above, simultaneously. Results: The size of the inferior turbinates was increased statistically in condition three, post-anesthesia, lying in the Rose position, and condition four, at the end of surgery 30 to 50 minutes after anesthesia, compared to condition one, pre-anesthesia lying in the supine position. In addition, the minimal cross-sectional area of the nasal cavity was decreased in condition one compared to condition four. Conclusion:The size of the inferior turbinates was influenced by general anesthesia and the Rose position, presumably due to engorgement of the venous sinuses and/or mucosal edema.

      • KCI등재
      • SCOPUSKCI등재
      • KCI등재

        Sn-Zn 공정합금의 응고속도에 따른 조직과 기계적 성질에 관한 연구

        이주형,이계완 ( J . H . Lee,K . W . Lee ) 한국주조공학회 1985 한국주조공학회지 Vol.5 No.4

        The structures and mechanical properties of undirectionally solidified Sn-Zn eutectic alloys have been examined over the growth range 7㎜/h to 6,000㎜/h. The structures of undirectionally solidified Sn-Zn eutectic alloys were primarily broken-lamellar at growth rates below 760㎜/h and became fibrous at higher growth rates above that. At a growth rate 3,084㎜/h the structures were fibrouse only. There is no dendrites at any growth rates, but occasionally ribbon-like morphologies were seen. The under cooling increased parabolically with growth rate increase. The hardness of specimes increased with growth rates increase but heat-treated specimen decreased after growth rates 760㎜/h and became constant value. The effect of heat-treatment was good at lower growth rate. At room temperature tensile strength increased with growth rates up to R=990㎜/h and then tensile strength became near-constant value. The effect of heat-treatment was well at lower growth rate.

      • KCI등재

        마라난타의 출신지와 축건, 간다라

        이주형 중앙아시아학회 2019 中央아시아硏究 Vol.24 No.2

        Over the last two decades the claim that the monk Maranan’ta (or Mālānanda), who transmitted Buddhism to Paekche, was originally from Gandhāra became widespread in both scholarly and Buddhist communities in Korea. It is also commonly known in Pakistan as a symbol of the long-standing cultural relationship between Korea and Pakistan in history. This article examines the evidence for this claim and attempts to clarify that it is unfortunately a sheer misconception. The literary evidence for Maranan’ta’s origin in Gandhāra is allegedly found in the Haedong kosŭngjŏn 海東高僧傳 by Kakhun (1215). It states that Maranant’a came to China from Zhuqian 竺乾. Noting that the character zhu 竺 is part of a common appellation used for India in ancient China, Tianzhu 天竺, and that the character qian 乾 is the same one employed in a common Chinese transcription of the word Gandhāra, Qiantuoluo 乾陀羅, some scholars translated Zhuqian as “India or Gandhāra” or “Gandhāra of Tianzhu (India).” However, this is a downright mistake because Zhuqian means no other than India as a synonym of Tianzhu. It is clearly stated in Chinese Buddhist sources such as the Hongmingji 弘明集 (518) and the Zhenzhenglun 甄正論 (684-705). Especially, the Zhenzhenglun explains: “‘Qian 乾’ is ‘tian 天’ (heaven). Therefore, the two trigrams qian and kun 坤 symbolize heaven and earth in the Book of Changes. We can see here clearly that ‘qian’ means ‘tian.’ Later people, while copying, mistakenly placed the character zhu before the character qian.” The fact that Zhuqian is the same as Tianzhu in meaning is also confirmed in its usage in many other textual sources. Therefore, the Haedong kosŭngjŏn simply states that Maranant’a came from India, and the account has absolutely no reference to Gandhāra. In addition to the misreading of Zhuqian in the Haedong kosŭngjŏn, it has been suggested that the actual birthplace of Maranant’a is identified at a small town called Chota Lahor near Swabi in the Peshawar basin, ancient Gandhāra. Although the Korean scholar Min Hee Sik, who first claimed this attribution, alleges that the evidence is found in a French source, he has never been able to present it publicly. His small book From Gandhāra to Yŏnggwang published in 2001, probably the only work other than media reports that discusses this theory in publications, at least in a quasi-scholarly manner, amply shows that the assertion is most likely the creation of his sheer imagination. It is deplorable that the claim of Maranant’a’s origin in Gandhāra has been virtually established with no questioning in most of scholarly works on Paekche Buddhism and enthusiastically received by the Buddhist community in Korea. I hope that the misunderstanding will soon be straightened out and the embarrassing occurrences concerning Maranant’a will no longer persist.

      • KCI등재

        정수처리 적용을 위한 UF/MF 중공사막의 투과성능과 오염현상

        이주형,김정학,이용택 한국막학회 2000 멤브레인 Vol.10 No.2

        본 연구는 정수처리 공정에서 예상되는 오염물질에 대한 막의 투과성능과 오염현상을 알아보기 위하여 막의 깊이와 운전압력에 따른 압밀화 현상을 검토하였다. 막의 길이와 운전압력이 증가함에 따라 압밀화 현상도 증가하였다. MF막을 오염물질에서 고압(2.0 kg/cm2)과 저압(0.5 kg/cm2)으로 운전할 때, 고압 운전이 막힘현상(clogging)을 가속화 시켜 플럭스를 급격히 감소시키므로 저압 운전이 효과적이다. MF막을 Out-In방식으로 운전하였을 때, 막의 길이와 운전 압력에 관계없이 일정 시간 운전 후 비슷한 플럭스가 나타났다. 미생물 물질에 대한 막오염 현상을 파악하기 위해 중공사막을 강제 오염시킨 후 화학세정을 실시하였다. Biofouling된 막을 화학세정 하였을 때 산화능력이 우수한 H2O2와 NaOCl이 NaOH에 비해 살균능력과 탈착능력이 우수하다는 것을 알 수 있었다. This study, which was tarried out to investigate the characteristics of permeation rates and fouling phenomena in drinking-water treating processes with MF membrane, showed that pressure drop was dependent on the length of membrane module and operating pressure; the pressure drop increased with the length of membrane module and operating pressure, operation at a relatively low pressure(0.5kg/cm2) is better than that at a relatively (2.0kg/cm2), since high operating pressure accelerates the clogging. In case of out-in permeation type, almost same flux was obtained after a certain operating time regardless of membrane length and operating pressure. In order to understand, the microbial fouling, chemical cleaning was carried out to the forced contaminated hollow-fiber membrane with chemicals(H2O2, NaOCl, and NaOH). Chemical cleanings with H2O2and NaOCl, which are oxidizing agents, are better for sterilizing and desorbing the microbes than those with NaOH.

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