• Journal of Communications and Networks
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• v.8 no.3
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• pp.306-312
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• 2006

This paper studies theoretically the bit error rate (BER) performance of cooperative transmission using space-time block code (STBC) in a fully distributed manner. Specifically, we first propose a STBC-based cooperative signaling structure to make the cooperation of three single-antenna terminals possible. Then, we derive the closed-form BER expressions for both cooperation and noncooperation schemes under flat Rayleigh fading channel plus additive white Gaussian noise (AWGN). The validity of these expressions is verified by Monte-Carlo simulations. A variety of numerical and simulation results reveal that the cooperative transmission achieves higher diversity gain and better performance than the direct transmission for the same total transmit power.

• Journal of Communications and Networks
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• v.9 no.2
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• pp.150-158
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• 2007

We consider channel-coded multi-input multi-output (MIMO) orthogonal frequency-division multiplexing (OFDM) transmission and obtain a condition on its signal for it to attain the maximum diversity and coding gain. As this condition may not be realizable, we propose a suboptimal design that employs an orthogonal transform and a space-frequency interleaver between the channel coder and the multi-antenna OFDM transmitter. We propose a corresponding receiving method based on block turbo equalization. Attention is paid to some detailed design of the transmitter and the receiver to curtail the computational complexity and yet deliver good performance. Simulation results demonstrate that the proposed transmission technique can outperform the conventional coded MIMO OFDM and the MIMO block single-carrier transmission with cyclic prefixing.

• Animal Systematics, Evolution and Diversity
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• v.12 no.4
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• pp.281-287
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• 1996

A new species of Caprellidae, Ca;rella multitberculum collected from 3 localities in the coast of the East Sea in Korea, is described and illustrated. This new species is very close to Caprella soyo Arimoto, 1934 from Japan, but is distinguished from it by having the more numerous small tubercles on body surface, the shorter flagellum of antenna 1 and the smaller appendages of abdomen. Moreover, the shape of propodus of gnathopod 2 reveals several prominent differences between the two.

• Animal Systematics, Evolution and Diversity
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• v.25 no.3
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• pp.237-242
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• 2009

The first zoeas of Chinese ditch prawn Palaemon gravieri (Yu, 1930) and carpenter shrimp Palaemon serrifer (Stimpson, 1860) are described and illustrated in detail based on laboratory-hatched material. They are distinguished from those of Palaemon ortmanni (Rathbun, 1902) and Palaemon pacificus (Stimpson, 1860), previously known larvae from Korean waters by the length of the rostrum and endopod of antenna, the shape of the third abdominal somite, and ornamentation of the fifth abdominal somite. Larval characters of the genus Palaemon are revised. A. provisional key to the known first zoeas of Palaemon from Korean waters is given.

• Animal Systematics, Evolution and Diversity
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• v.37 no.4
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• pp.349-353
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• 2021

Scolelepis (Parascolelepis) papillosa (Okuda, 1937), originally described from a single incomplete individual from Jeju Island in Korea, was collected from the intertidal sandflats of Soan Island (Jeollanam-do province) in Korea. The examined specimens of S. (P.) papillosa agree well with the original description in having the papillae on the basal sheath of the palps, presence of occipital antenna, absence of notochaetae in chaetiger 1, branchiae completely fused with notopodial postchaetal lamellae at the anterior chaetigers, and neuropodial hooded hooks appearing from chaetiger 16. In this study, the sequences of partial mitochondrial cytochrome c oxidase subunit I (COI), 16S ribosomal DNA (16S rDNA), and the nuclear 18S ribosomal DNA (18S rDNA) of the species were determined. We also provide the detailed description and illustrations on this species based on the complete specimens newly collected in this study.

• Animal Systematics, Evolution and Diversity
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• v.35 no.2
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• pp.76-83
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• 2019

The species Orchomenella littoralis Nagata, 1965 belong to the family Tryphosidae Lowry & Stoddart, 1997. Previously this species was only known from a single record identified in Japanese waters, and newly recorded from Baengnyeongdo-Island, on the west coast of Korea. The species is similar to Orchomene breviceps Hirayama, 1986 in carrying posteroventral teeth on epimeron 3. However, O. littoralis is characterized by the presence of 4-7 posteroventral teeth of epimeron 3, a round posterodistal lobe of coxa 4, and elongated antenna 2 in male. The species is described and fully illustrated in the present study. Also, a key to Korean Orchomenella species is provided.

• Animal Systematics, Evolution and Diversity
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• v.35 no.4
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• pp.168-181
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• 2019

Two cirolanid isopods, Eurydice longiantennata Nunomura and Ikehara, 1985 and Metacirolana japonica (Hansen, 1890), are newly reported based on the materials collected from the subtidal zone around Jeju Island. Eurydice longiantennata can be distinguishable from its congeners by the following features: body length is 5 mm; antennule is not extending beyond the cephalon; flagellum of the antenna is consisted of 31 flagellar articles; and pleotelson has eleven teeth and twelve setae distally. Metacirolana japonica is distinguished from its related species by the following characteristics: body is not ornament; pleonite 1 is entirely visible dorsally in male; pleotelson is gradually tapering distally; and uropodal rami have serrate margins.

• Animal Systematics, Evolution and Diversity
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• v.35 no.4
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• pp.161-167
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• 2019

Two new records of spionid polychaetes, Malacoceros reductus Blake & Kudenov, 1978 and Pseudopolydora cf. kempi (Southern, 1921), collected from Korean waters are reported here with detailed descriptions and illustrations. Malacoceros reductus, only reported in New South Wales, Australia, is distinguishable from its relatives by a prostomium with lateral horns, reduction of chaetiger 1, and the presence of the tridentate hooded hooks. Pseudopolydora cf. kempi, which has been known to have a wide geographical distribution, is characterized by a prostomium incised anteriorly, the presence of the occipital antenna, and two rows of black spots on the dorsal side. In this paper, photographs of scanning electron microscopy for characteristic features of each species are presented.

• Animal Systematics, Evolution and Diversity
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• v.38 no.2
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• pp.83-90
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• 2022

Ovigerous crab of Sphaerozius nitidus of the family Menippidae was collected from Geojedo, Gyeongsangnamdo and hatched in the laboratory. Digital imaging of live zoeas of the first zoea stage of S. nitidus has been reported for the first time in the world, and its morphology has been redescribed and illustrated. This study is different from former study in that it has three unequal setae with exopod of antenna, 5+4 setae with basial endite of maxilla, and dorsomedial spine and lateral minute spine with fork of telson. The first zoea of S. nitidus has black pigments occurring behind the eyes, on the dorsal spine medially and on the basis of lateral carapace spines, on basal of basis of maxillipeds 1, 2, and posterior margins of somites 1-5, and yellowish green chromatophores on the dorsal spine.

• Animal Systematics, Evolution and Diversity
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• v.38 no.3
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• pp.122-129
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• 2022

Scolelepis (Scolelepis) lingulata is newly reported in Korean waters. This species, collected from the intertidal zone of the Yellow Sea, is in good agreement with the original and subsequent descriptions in presence of occipital antenna, conspicuously large and lingulate interramal lobes in posterior chaetigers, absence of hooded hooks in notopodia, and unidentate hooded hooks present in neuropodia. Additionally, Korean specimens previously identified as Scolelepis(Scolelepis) kudenovi are reexamined based on the morphology. As a result, these specimens were identified as Scolelepis (Scolelepis) daphoinos in terms of the presence of reddish-brown pigmentation along the transverse ciliated bands on the dorsum. The identification key to Scolelepis species from Korean waters is provided.