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Instantaneous Temporal Parts and Time Travel
김세화,Takeshi Sakon 한국논리학회 2017 論理硏究 Vol.20 No.1
The standard definition of an instantaneous temporal part cannot properly deal with cases involving time travel. This paper provides a new definition of an instantaneous temporal part by appealing to David Lewis's distinction between external time and personal time. The new definition avoids the problems because it does not allow more than one instantaneous temporal part of an object at each moment of its personal time. We argue that this new definition, combined with our new perdurantist semantic thesis, deals with cases of time travel successfully.
김세화 한국환경생물학회 2015 환경생물 : 환경생물학회지 Vol.33 No.2
Pre-monsoon dynamics of zooplankton community were investigated in the downstream of the Gagok stream flowing into the East Sea of Korea. Monthly sampling was carried out to collect zooplankters at five sites in the stream during the period between April and July 2014. Dissolved oxygen contents exceeded 7.0 mg L-1 all the time. Water temperature was in a range of 15.7 to 24.9˚C and pH 7.4 to 8.8, respectively. A total of 75 taxa consisted of 36 species of rotifers, 16 species of cladocerans, 16 species of copepods, four kinds of aquatic insects, two kinds of decapods and one nematod was occurred. One species of marine copepod and one cladoceran, and one species of brackish rotifer and one copepod distributed at the station located in the stream mouth. Zooplankton abundance showed to vary from 42 to 4202 individuals m-3 due to the explosion of aquatic insects and Alona sp. at site 2 located in the downstream in April. Heavy rainfall during the monsoon period seems to decrease the zooplankton abundance caused by diffusion and drifting to the sea. Species diversity indices were generally high between 1.2~2.3 and were recorded to be high at the downstream throughout the study period. With the zooplankton dynamics, the influence of the input of sea waters into the stream seemed to be confined to some hundred meters of the stream mouth facing the East Sea.
김세화,조규희 용인대학교 자연과학연구소 2002 自然科學硏究所論文誌 Vol.7 No.1
Investigation on zooplankton dynamics was carried out to know seasonal variation in zooplankton fauna in waters off Yongduck, Korea, Quantitative zooplankton samples were collected seasonally in winter, spring, summer and autumn in ten selected stations in Yongduck waters. A total of 79 taxa of zooplankton occurred in waters off during the study. Copepods showed the prosperity in species number (44 species as 67.1% of total number of zooplankton taxa occurred). Seasonally, 39 taxa occurred in the winter, 33 in spring, 48 in summer and 56 in autumn, respectively. Mean abundance of ten stations was recorded to be the minimum of 966 indiv.m^-3 in th winter and the maximum of 5,428 indiv.m^-3 in summer. Dominant zooplanters were Parcalanus indicus, Oithona similis, Oikopluera dioika, Firitillaria sp. and Noctilluca scintillans. Spatial distribution showed to be the lowest in stn 1. which located hust a front of the Chucksan fisheries harbour in Yongduck. It seems to be affected by the input of contaminants excreted from the harbour. Whereas the nutrients input possibly promotes the increase of primary and secondary production in near-shore waters of the harbour.
굴 양식장에 자생하는 미더덕, 진주담치, 따개비류의 먹이 경쟁에 관한 연구
김세화 龍仁大學校 2003 용인대학교 논문집 Vol.21 No.-
Food competition among four kinds of attached organisms ( Crassostrea sp., Styela clava, Mytilus eculis and Cirripedian sp.) in the oyster bed. Tongyong was investigated in November 2001. During 72 hour investigation, phytoplankton standing crops in control chamber decreased from 16.298.5cells/l (mean value of three chambers) to 8398.8cells/l in first 24 hours. Next 24 hours, it decreased to 5254.7cells/l, and 4891.2 cells/l, gradually. Filtering rate for each organism was 7,659cells/g dry weight/day for Crassostrea sp, 7,770cells/g dry weight/day for Styela clava and 1,558cells/g dry weight/day Cirripedian sp., respectively. No such a clear filtering rate was observed for Mytilus eculis . The conclusion is that short term experiment might be more effective than long term one for the measurement of filtering rate. experimental bag of 04-1㎛ pore size is also needed. Drastic decrease in chlorophyll-a contents and standing crops seems to be due to the artificial concentration. then spring bloom period is recommended to be an experimental period.
기관절개술후 종격동기관 협착증에 대한 기관절제 단단 문합술
김세화,박희철,이홍균,Kim, Se-Wha,Park, Hee-Chul,Lee, Hong-Kyun 대한흉부심장혈관외과학회 1980 Journal of Chest Surgery (J Chest Surg) Vol.13 No.4
A 37 year old male patient was suffered from severe labored breathing caused by post tracheostomy stenosis, which was localized at the mediastinal trachea [cuffed tracheal stenosis] and ranged 1.5 cm in length and approximately 3 ram. in diameter on tracheogram. After dilation of tracheal stenosis with dilator, endotracheal intubation was tried for induction of anesthesia and control of respiration during operation. A tube was placed just beyond the tracheal stenosis without respiratory difficulty. Under the endotracheal anesthesia, circumferential resection of the mediastinal trachea containing the stenosis, approximately 2 cm in length [4 tracheal rings}, was carried out and primary direct end to end anastomosis was performed with interrupted submucosal sutures [3-0 Dexon] and mobilization of trachea Postoperative tracheostomy was not performed. The patient was completely relieved from dyspnea immediately after operation. Post-operative convalescence was entirely uneventful and at present, about 3 months after operation, he is now conducting a usual life. From the literature and our experience, the etiology and treatment of post-tracheostomy stenosis were discussed.