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申明植,鄭文植 대한보건협회 1978 대한보건연구 Vol.4 No.1
A study was carried out to obtain information on the effect of sediments on the survival of Escherichia coli in sea waters during the period from 29 to July 20, 1977. All water and sediment samples were collected from the estuary (Koyang), Incheon Bay, and Dukjug Island in Kyungki Province. Coliform and fecal coliform determinations on field samples were done fay MPN method and E. coli survival test was performed at 48hr intervals for 15 day by the standard plate count method on eosine methylene blue agar plates. The results obtained are summarized as follows; 1. On a volume basis larger numbers of coliform and fecal coliform organisms were found in the sediments than in the sea waters. 2. When E. coli was added to nonautochaved seawaters, with and withont nonautoclaved sediments, it was .observed that E. coli survived longer in the presence of sediments. 3. E. coli was found to increase rapidly in number and to survive long when it was added to autoclaved seawaters and sediments, but it was observed that E. coli decreased rapidly in number and to survive short period when it was added to nonautoclaved seawaters and sediments. 4. When E. coli was added to autoclaved seawaters, with and without autoclaved sediments, it was found that E. coli surived longer and increased more rapidly in number in the presence of sediments. 5. When E. coli was added to nonautoclaved seawaters, with nonautoclaved and antoclaved sediments, it was found that E. coli survived longer and increased rapidly in autoclaved sediments than in nonautoclaved sediments.
Supporting Real-Time Multimedia Traffic in a Wireless LANs
신명식,양해슬,Shin, Myung-Sik,Yang, Hae-Sool Korea Institute of Information and Telecommunicati 2009 정보통신설비학회논문지 Vol.8 No.1
This paper presents a new dynamically adaptable polling scheme for efficient support of real-time traffic over an IEEE 802.11 wireless LAN network. The poll scheduling plays an important role in IEEE 802.11 PCF. However, the current version of the polling list management scheme proposed in the IEEE 802.11 standard is inefficient when a variable number of mobile stations have variable packets to transmit. If Point Coordinator has an exact information on the station status, it is possible to efficiently perform polling. In this paper, we suggest an adaptable polling scheme to meet requirements of the stations. In our scheme, each station transmits packets including a piggyback information to inform that it wants to receive a poll in the next polling duration. Simulation results indicate that our scheme may reduces the packet discard ratio and real-time packet transfer delay.
부평은연광산(富平銀鉛鑛山)의 지질(地質)과 광상(鑛床)
신명식,Shin, Myeong Sik 대한자원환경지질학회 1970 자원환경지질 Vol.3 No.3
Bupyong lead-silver mine is located at outskirt of Inchon, a harbor city on the Yellow Sea about 40 km due west of Seoul. The geology of the area is composed of gneisses of pre-Cambrian age, rhyolite of Jurassic to Cretaceous age which extruded over the gneisses and late Cretaceous granite. Small diabasic dike is observed only in the underground. The contact plane between overlying rhyolite and underlain gneiss is sinuous and generally pitches about $30^{\circ}{\sim}40^{\circ}$ toward east. Conjugate joints and fissures are well developed in the rhyolite striking generally north-southward. Three ore bodies are being exploited and three more are under prospecting. These ore bodies range from few tons of hundred thousand to million tons in reserve. These ore bodies occur exclusively in the rhyolite along joints as network and/or desseminated type. The lower limit of ore bodies is always delineated at about 20~30m above the gneiss which might be indicative of ore genesis that has not been clearly explained so far. Two hypothesis on ore genesis could, however, be considered: firstly lithologic difference in the rhyolite might be a manifestation of different flows along which ore solution ascended and replaced along joints; secondly diabasic dike has acted as ore bringer since the dike contains considerable amount of silver, lead and zine. Ore minerals are galena and native silver accompanied by pyrite, argentite, pyragyrite and magnetite. It is believed that pyritization took place in advance to main mineralization, and ore deposit is classified as meso- to epi-thermal type.