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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.
W-CDMA 무선통신 채널에서 터보 부호를 적용한 OFDM 시스템의 성능 분석
신명식,양해술 한국인터넷방송통신학회 2010 한국인터넷방송통신학회 논문지 Vol.10 No.4
디지털 통신 시스템에서 오류 정정 부호화 방식으로 사용되는 터보 부호의 성능은 부호기에 내재되어 부호의 자유 거리 결정에 큰 영향을 미치는 인터리버의 크기와 터보 복호기의 반복 복호 알고리듬에 의한 것이다. 하지만 우수한 성능을 얻기 위해서는 일정 횟수 이상의 반복 복호가 필요하고 이 과정에서 많은 시간 지연이 요구된다. 최근에 터보 부호의 성능을 감소시키지 않으면서 반복 복호 횟수를 감소시키는 방법들이 연구되고 있다. 본 논문에서는 기존의 반복복호 감소방식(stopping criteria) 중에서 ME(mean estimate)방식과 SDR(sign difference ratio)방식을 연접시킨 새로운 방식을 제안하고 두 방식의 상호보상을 통해 약 1~2회 정도의 반복복호 횟수를 감소시켜 성능 향상을 가질 수 있음을 확인하였다. 또한 선형으로 연결된 두 개의 복호기 모두에 이 방식을 적용시켜 보다 빠른 복호가 가능하도록 하였다. 시스템 환경은 MAI(multiple access interference)가 극심한 W-CDMA의 순방향 링크로 가정하였다. In the recent digital communication systems, the performance of Turbo Code used as the error correction coding method depends on the interleaver size influencing the free distance determination and the iterative decoding algorithms of the turbo decoder. However, some iterations are needed to get a better performance, but these processes require a large time delay. Recently methods of reducing the number of iteration have been studied without degrading original performance. In this paper, the new method of combining ME (Mean Estimate) stopping criterion with SDR (sign difference ratio) stopping criterion among previous stopping criteria is proposed, and the fact of compensating each method's missed detection is verified. Faster decoding is realized that about 1~2 time iterations to reduced through adopting this method into serially concatenated both decoders. System Environments were assumed W-CDMA forward link system with intense MAI (multiple access interference).
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.
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.