• Korean Journal of Plant Resources
• /
• v.27 no.2
• /
• pp.133-154
• /
• 2014

We investigated the flora of Yeoseo-do (N $33^{\circ}58^{\prime}$, E $126^{\circ}55^{\prime}$), located in Wando-gun, Jeollanam-do, South Korea and discussed the vascular plants found there. Four separate field trips were completed from April to October of 2013. The vascular plants were summarized as 463 taxa; 112 families, 306 genera, 409 species, 6 subspecies, 42 varieties, 5 forms and 1 hybrids. The number of endemic species of Korea were 6 taxa, and 12 taxa designated by the Ministry of Environment as red data of endangered vascular plants were investigated in this region. There were a total of 98 taxa of floristic regional indicator plants and one taxon of level I endangered species, Neofinetia falcata (Thunb.) Hu, as designated by the Ministry of Environment. 33 taxa have shown their southern distributional limit ranges, and 10 taxa of halophytes were confirmed in the Yeoseo-do (Isl.). In additon, 27 taxa of the naturalized plants were recorded.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 1999.05a
• /
• pp.415-419
• /
• 1999

Many bipolar logic circuit of conventional occurred problem of speed delay according to deep saturation state of vertical NPN Transistor. In order to remove minority carries of the base region at changing signal in conventional bipolar logic circuit, we made transistor which is composed of NPN transistor shortened buried layer under the Base region, PNP transistor which is merged in base, epi layer and substrate. Also the Ring-Oscillator for measuring transmission time-delay per gate was designed as well. The structure of Gate consists of the vertical NPN Transistor, substrate and Merged PNP Transistor. In the result, we fount that tarriers which are coming into intrinsic Base from Emitter and the portion of edge are relatively a lot, so those make Base currents a lot and Gain is low with a few of collector currents because of cutting the buried layer of collector of conventional junction area. Merged PNP Transistor's currents are low because Base width is wide and the difference of Emitter's density and Base's density is small. we get amplitude of logic voltage of 200mv, the minimum of transmission delay-time of 211nS, and the minimum of transmission delay-time per gate of 7.26nS in AC characteristic output of Ring-Oscillator connected Gate.

• Journal of the Korean Institute of Telematics and Electronics S
• /
• v.36S no.8
• /
• pp.17-29
• /
• 1999

Inter-Satellite Links(ISL) technique in the Polar Orbit Satellite plays the key role in the communication methods in IRIDIUM system, where the ISL is commonly established between neighbor satellites. The system has major drawbacks in maintaining the multi-hopping link connectivities while the satellite nodes are communicating each other. The proposed system is newly designed to allow diagonal link connections between the satellites and shows how it does improve the performance. The optimized number of satellites in the terms of their altitudes and visible distance are calculated. The traffic parameters and the probability of blocking are analyzed to compare the visible satellite link method with the neighbor link method mathermatically.

• Journal of the Korean Society of Combustion
• /
• v.12 no.4
• /
• pp.31-38
• /
• 2007

An numerical study was conducted on superdetonative mode ram accelerator with length extended combustor. The computation condition was based on ISL's RAMAC30 II S225 experiment. For 50% length increased combustor, flame is not sustained. For the case of 60% and 70% increase, flame is successfully sustaind. But detonation wave is oscillating and acceleration is fluctuating. Extention of combustor is helpful for sustaing detonation wave but it may cause unstart.

• Korean Journal of Fisheries and Aquatic Sciences
• /
• v.12 no.1
• /
• pp.41-63
• /
• 1979

한국산 다모환충류의 분류에 관한 연구의 일환으로서 1978넌 남해수역의 중심지역인 거문도와 백도에서 채집한 저서성 갯지렁이류를 동정 분류한 결과 11과 19속 24종의 다모환충류를 얻었기에 그 형태적 특징을 바탕으로 과와 종의 분류검색료를 작성하였다. 이 가운데 Syllis sclerofaema 흰점염주발갯지렁이, Amphitrite cirrata 유령꽃갯지렁이, Salmacina dysteri 가는관덮개꽃갯지렁이, Dexiospira foraminosus 동그라미관덮개꽃갯지렁이 등의 3과 4종은 한국 미기록종으로 우리나라 동물상에 최초로 기재된다.

• 한국연소학회:학술대회논문집
• /
• 2005.10a
• /
• pp.28-31
• /
• 2005

The numerical simulation is conducted for analysis flame structure of superdetonative ram accelerator experiment by ISL(French-German Research Institute in Saint Louis). Fully coupled chemically non-equilibrium Navier-Stokes equation is used. Shockwave structure of superdetonative ram accelerator and behavior of detonation wave is studied. Maintaining of detonation wave is very important to accelerate projectile, Because detonation wave make high pressure gases and this high pressure accelerate projectile.

• The Korean Journal of Zoology
• /
• v.12 no.1
• /
• pp.13-21
• /
• 1969

韓國産 陸棲貧毛類의 分類學的 硏究의 일련으로서 1965年 $\\sim$ 1966年 및 1968年에 採集된 울릉도 産을 調査한 結果 3科 5屬 10種(Allolobophora caliginosa trapezoides, Eisenia foetida, Pheretima agrestis, Ph. heteropoda, Ph. hilgendorfi, Ph. hupeiensis, Ph. phaselus, Ph. serrata, Ph. sp. 1 Ph. sp. 2)을 報告하였다. 울릉도의 陸棲貧毛類에 관해서는 지금까지 報告된 바 없으므로 이들은 全部 울릉도 未記錄이 되고 이중 Pheretima heteropoda Goto et Hatai 는 韓國 未記錄種이고 Phertima hilgendorfi 는 male pore를 가진 點이 本土産과 比較해서 若干 特異하였다.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 1994.04a
• /
• pp.13-20
• /
• 1994

We consider the satellite cluster scheduling problem which is one of the most interesting problems in satellite communication scheduling area. This problem is known to be NP-complete and a couple of heuristic algorithms had been developed. In this paper, we suggest another algorithm for this problem which has the same computational complexity as the best existing one and provides much better solution quality. Extensive computational simulation results are reported.

• Animal Systematics, Evolution and Diversity
• /
• v.27 no.1
• /
• pp.89-92
• /
• 2011

Hydroid specimens were collected from the coasts of Isl. Jeongjokdo (Taean) and Gampo Harbour, Korea, on 10 May and 19 October 2010. Two of the species identified as Sertularia tenera G.O. Sars 1874 and Plumularia halecioides Alder 1859 are new to Korean fauna. They are described with illustrations.

• Korean Journal of Plant Resources
• /
• v.26 no.2
• /
• pp.178-213
• /
• 2013

This study was carried out to investigate the flora of Baengnyeongdo (Isl.). The vascular plants which were collected in 5 times (from Aug. 2011 and Nov. 2012) were identified as 732 taxa in total, including 124 families, 411 genera, 647 species, 8 subspecies, 68 varieties, 7 forms and 2 hybrids. 193 of these taxa were first records for the region. In the flora of this area, the endangered plants designated and protected by the wildlife protection law, the Ministry of Environment, Korea were counted to two taxa. Korean endemics plants numbered 8 taxa, and 78 taxa of specially designated floristic regional indicator plants by the Ministry of Environment. And rare plants were identified as 20 taxa. Based on the list of southern and northern limit of distribution plants, 30 taxa and 43 taxa of halophytes were recorded in the investigated area. The naturalized plants were identified as 92 taxa, and their naturalization ratio were found to be 12.5%, respectively.