한강 인도교지점에서의 이상홍수 해석

조원철,허준행,서규우,이원환 연세대학교 산업기술연구소 1994 논문집 Vol.26 No.1

The water level and flow rate data measured at Indogyo measurement point which serves as one of the major measuring points of Han River have been very important in aspect of controlling the flow. Because these data are becoming more and more unreliable due to the recent change in the basin or the narrowing of the river width, these data will be standardized by comparing the recent data of Indogyo measuring point with the past those. To minimize the errors of water level-flow rate curve caused by the yearly changes of basin, the standard water level-flow rate curve with respect to the present basin conditions will be set, and calculated reduced water level will be compared with the past data. And through frequency analysis, frequency-based flood level with respect to return period will be presented. Finally, the total flow rate of the flood measured in September, 1990 at the point of Indogyo measuring point will be compared with the total flow of the past extreme floods.

A New Record of the Genus Anonyx (Crustacea: Amphipoda: Uristidae) from Korean Waters

Heo, Jun-Haeng,Kim, Young-Hyo The Korean Society of Systematic Zoology 2018 Animal Systematics, Evolution and Diversity Vol.34 No.2

A newly recorded species of lysianassid amphipod, Anonyx schefferi Steele, 1986 which belongs to the family Uristidae Hurley, 1963 was collected from the East Sea of Korea. The genus Anonyx Krøyer, 1838 was subdivided into five groups mainly based on the amount of constriction of the inner ramus of uropod 2: A. bispinosus group, A. compactus group, A. laticoxae group, A. nugax group, A. validus group. Anonyx schefferi is included in one of the A. laticoxae group. This species is similar to Anonyx laticoxae Gurjanova, 1962, but A. schefferi is characterized by an unconstricted inner ramus of uropod 2 and an upturned epimeron 3 posteroventrally. The species is described and fully illustrated in the present study.

Morphological Redescription of the Rare Caprellid Protogeton incertus (Crustacea: Amphipoda: Caprellidae) from Korea

Heo, Jun-Haeng,Hong, Soon-Sang,Kim, Young-Hyo The Korean Society of Systematic Zoology 2016 Animal Systematics, Evolution and Diversity Vol.32 No.2

Protogeton incertus Mayer, 1903 belonging to the family Caprellidae was collected from the South Sea, Korea. This species is very similar to Protogeton inflatus Mayer, but it is only distinguishable by the presence of biarticulate mandibular palp. Previous studies provided a very brief description of the species and lacked detailed illustration. In this study, the Korean Protogeton incertus is fully illustrated based on the mature and immature specimens.

Two new record of the genus Anonyx (Crustacea: Amphipoda: Uristidae) from Korean waters

Heo, Jun-Haeng,Kim, Young-Hyo The National Institute of Biological Resources 2021 Journal of species research Vol.10 No.3

Two newly recorded carnivorous amphipod species, Anonyx gurjanovai Steele, 1986 and A. nugax (Phipps, 1774) belonging to the family Uristidae Hurley, 1963, were collected from the East Sea, Korea. Anonyx gurjanovai is included in the A. laticoxae group and is characterized by a concave palm of the propodus in gnathopod 1 and small posteroventral projection at epimeron 3. The other species, A. nugax, represents the A. nugax group and is distinguished from congeneric species based on the presence of a shorter and less acute projection on epimeron 3. There are 13 species of the A. nugax group recorded worldwide, but this is the first report on the presence of the A. nugax group in Korean waters. Previously, three species of the genus Anonyx had been reported in Korea, and through this study, we have added two newly recorded species. Both the newly recorded Anonyx species are illustrated and compared with the related species. A key to the Anonyx species in Korea is also provided.

A New Record of the Genus Anonyx (Crustacea: Amphipoda: Uristidae) from Korean Waters

Jun-Haeng Heo,Young-Hyo Kim 한국동물분류학회 2018 Animal Systematics, Evolution and Diversity Vol.34 No.2

A newly recorded species of lysianassid amphipod, Anonyx schefferi Steele, 1986 which belongs to the family Uristidae Hurley, 1963 was collected from the East Sea of Korea. The genus Anonyx Krøyer, 1838 was subdivided into five groups mainly based on the amount of constriction of the inner ramus of uropod 2: A. bispinosus group, A. compactus group, A. laticoxae group, A. nugax group, A. validus group. Anonyx schefferi is included in one of the A. laticoxae group. This species is similar to Anonyx laticoxae Gurjanova, 1962, but A. schefferi is characterized by an unconstricted inner ramus of uropod 2 and an upturned epimeron 3 posteroventrally. The species is described and fully illustrated in the present study.

CAUTION OF REGIONAL FLOOD FREQUENCY ANALYSIS BASED ON WEIBULL MODEL

Heo, Jun-Haeng,Lee, Dong-Jin,Kim, Kyung-Duk Korea Water Resources Association 2000 Water engineering research Vol.1 No.1

Regional flood frequency analysis has been developed by employing the nearby site's information to improve a precision in estimating flood quantiles at the site of interest. In this paper, single site and regional flood frequency analyses were compared based of the 2-parameter Weibull model. For regional analysis, two approaches were employed. The First one is to use the asymptotic variances of the quantile estimators derived based of the assumption that all sites including the site of interest are independent each other. This approach may give the maximum regional gain due to the spatial independence assumption among sites. The second one in Hosking's regional L-moment algorithm. These methods were applied to annual flood data. As the results, both methods generally showed the regional gain at the site of interest depending on grouping the sites as homogeneous. And asymptotic formula generally shows smaller variance than those from Hosking's algorithm. If the shape parameter of the site of interest from single site analysis is quite different from that from regional analysis then Hosking's results might be better than the asymptotic ones because the formula was derived based on the assumption that all sites have the same regional shape parameter. Furthermore, in such a case, regional analysis might be worse than single site analysis in the sense of precision of flood quantile estimation. Even though the selected sites may satisfy Hosking's criteria, regional analysis may not give a regional gain for specific and nonexceedance probabilities.

A New Record of the Species Orchomenella pinguis (Crustacea, Amphipoda, Tryphosidae) from Korean Waters

Jun-Haeng Heo,Young-Hyo Kim 한국동물분류학회 2021 Animal Systematics, Evolution and Diversity Vol.37 No.2

A newly recorded species Orchomenella pinguis (Boeck, 1861) belonging to the family Tryphosidae Lowry and Stoddart, 1997 has been collected from the east sea of Korea. The species is similar to O. minuta (Krøyer, 1846) and O. pinguides Walker, 1903 but, distinguishable with the following characteristics: gnathopod 1, propodus slightly narrowing distally; gnathopod 1, carpus with narrowly developed posterior lobe; gnathopod 2, carpus conspicuously swollen posteriorly; coxae 5-6, posterodistal lobes strongly produced; epimera 2-3, irregularly serrated posteriorly. The species is described and fully illustrated in this study. A key to the Korean species of Orchomenella is also provided.

A New Record of the Genus Orchomenella (Crustacea, Amphipoda, Tryphosidae) from Korean Waters

Jun-Haeng Heo,Young-Hyo Kim 한국동물분류학회 2019 Animal Systematics, Evolution and Diversity Vol.35 No.2

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.

A new record of the species Caprella arimotoi (Crustacea: Amphipoda: Caprellidae) from Korean waters

Heo, Jun-Haeng,Choi, Jaehong,Kim, Young-Hyo The National Institute of Biological Resources 2020 Journal of species research Vol.9 No.4

A newly recorded species Caprella arimotoi Takeuchi, 1993, belonging to the family Caprellidae Leach, 1814, was collected from the South Sea, Korea. This species is morphologically very similar to Caprella verrucosa Boeck, 1871, with blunt dorsal projections on pereonites, oval-shaped propodus on gnathopod 2, and grasping spines on the pereopods 5-7. Caprella arimotoi originated from C. verrucosa and are difficult to distinguish because they have mixed characteristics. However, C. arimotoi was classified because of several morphological differences. The newly recorded species C. arimotoi is discernible from C. verrucosa by a forwardly curved anterodorsal projection on head, elongated gills, slender pereopod 7, and lacking ventrolateral projections on pereonites 2-7. To date, C. arimotoi has only been reported in Japanese waters. So, our record is the first record in Korean waters and outside of Japan. In this study, the Korean C. arimotoi is illustrated based on the mature male specimens with a brief description of the female, focusing on the sexually dimorphic characters.

Critical Multiple Correlation Coefficient for Improving Mean and Variance in Augmenting Hydrologic Samples

Heo, Jun-Haeng Korea Water Resources Association 1995 Korean journal of hydrosciences Vol.6 No.-

The augmenting hydrologic data using a correlation procedure has been used to improve the estimates of the mean and variance at the site of interest with short record when one or more near by sites with longer records are available. The variance of the unbiased maximum likelihood estimator of $ derived by Moran based on the multivariate normal distribytion is modified into the form of Matalas and Jacobs for the biveriate normal distribution to get the critical minimum values of the multiple correlation coefficient which give the improvement for estimating the variance at the site of interest. Those values are tabulated for various lengths of short records and the number of sites.