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- 저자 : Erick Kim (검색결과 8 건)
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Breeding range variation between Korean hylids (Dryophytes sp.)
Erick Kim,Andi Nugraha Cahyana,장이권,Amaël Borzée 국립중앙과학관 2019 Journal of Asia-Pacific Biodiversity Vol.12 No.2
Home ranges represent the space where individuals eat, mate, and shelter. Breeding ranges are the areain which breeding activities are conducted, and in calling anurans, they generally include a territory witha calling site. There are two competing treefrog species in the Korean Peninsula, the endangered Suweontreefrog (Dryophytes suweonensis) and the common Japanese treefrog (D. japonicus). These two speciesare known to have a significant impact on each other’s behavior, and in this study, we test for variationsin breeding range and displacement distance. Data were collected through Harmonic Direction Findertracking for 26 D. japonicus and 6 D. suweonensis, aiming at 72-h tracking per individual. We determinedthat despite the absence of variation in the two species’ breeding range, there was a significant variationin mean average displacement, with D. japonicus moving more than D. suweonensis. This result matcheswith our expectation as D. japonicus has been demonstrated to be bolder and more exploratory and alsouses a larger variety of microhabitats between nocturnal periods of call production. These results areimportant in the larger framework of D. suweonensis conservation and the determination of theecological space of these two species.
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Munguti, Jonathan Mbonge,Kim, Jeong-Dae,Ogello, Erick Ochieng The Korean Society of Fisheries and Aquatic Scienc 2014 Fisheries and Aquatic Sciences Vol.17 No.1
The Kenyan aquaculture sector is broadly categorized into freshwater aquaculture and mariculture. Whereas freshwater aquaculture has recorded significant progress over the last decade, the mariculture sector has yet to be fully exploited. The Kenyan aquaculture industry has seen slow growth for decades until recently, when the government-funded Economic Stimulus Program increased fish farming nationwide. Thus far, the program has facilitated the alleviation of poverty, spurred regional development, and led to increased commercial thinking among Kenyan fish farmers. Indeed, national aquaculture production grew from 1,000 MT/y in 2000 (equivalent to 1% of national fish production) to 12,000 MT/y, representing 7% of the national harvest, in 2010. The production is projected to hit 20,000 MT/y, representing 10% of total production and valued at USD 22.5 million over the next 5 years. The dominant aquaculture systems in Kenya include earthen and lined ponds, dams, and tanks distributed across the country. The most commonly farmed fish species are Nile tilapia Oreochromis niloticus, which accounts for about 75% of production, followed by African catfish Clarias gariepinus, which contributes about 21% of aquaculture production. Other species include common carp Cyprinus carpio, rainbow trout Oncorhynchus mykiss, koi carp Cyprinus carpio carpio, and goldfish Carassius auratus. Recently, Kenyan researchers have begun culturing native fish species such as Labeo victorianus and Labeo cylindricus at the National Aquaculture Research Development and Training Centre in Sagana. Apart from limited knowledge of modern aquaculture technology, the Kenyan aquaculture sector still suffers from an inadequate supply of certified quality seed fish and feed, incomprehensive aquaculture policy, and low funding for research. Glaring opportunities in the Kenyan aquaculture industry include the production of live fish food, e.g., Artemia, daphnia and rotifers, marine fish and shellfish larviculture; seaweed farming; cage culture; integrated fish farming; culture of indigenous fish species; and investment in the fish feed industry.
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An effective method for accurate nymphal-stage delimitation of the cicada Hyalessa fuscata
Hoa Quynh Nguyen,Erick Kim,Yoonhyuk Bae,Soyeon Chae,Ji Seongmin,Jiman Heo,Sungsik Kong,Thoa Kim Nguyen,Hong Pham Thai,장이권 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.3
Subterranean nymphal development in cicadas presents challenges to researchers in accurately estimating the number of their developmental stages, although such information is crucial to understanding and predicting their population dynamics. While most studies have relied on head width as an attribute for life-stage determination to date, such character in cicadas can be highly variable and thus differentiation solely based on such morphology is prone to subjectivity in practice. Here, we propose a reliable method for instar estimation that is applicable to Hyalessa fuscata nymphs. We first obtained morphometrics of nymphs in all stages. Second, we computed logarithm-transformation and principal component analysis to extract a transformed variable that captures most of the variance of morphological characteristics. Third, k-means were computed to divide the dataset into distinct clusters assuming four-, five- and six life-stage scenarios for the best interferences of life stages. Finally, simple linear regression analysis was conducted to compare and select the best fit model. Our result shows that five nymphal stages best fit for H. fuscata nymphs. This method is expected to provide an easy-to-handle ecological tool for the study of life history of cicadas as well as other insects that have long life cycles and multiple developmental stages.
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( Jonathan Mbonge Munguti ),( Jeong Dae Kim ),( Erick Ochieng Ogello ) 한국수산과학회(구 한국수산학회) 2014 Fisheries and Aquatic Sciences Vol.17 No.1
The Kenyan aquaculture sector is broadly categorized into freshwater aquaculture and mariculture. Whereas freshwater aqua- culture has recorded significant progress over the last decade, the mariculture sector has yet to be fully exploited. The Kenyan aquaculture industry has seen slow growth for decades until recently, when the government-funded Economic Stimulus Program increased fish farming nationwide. Thus far, the program has facilitated the alleviation of poverty, spurred regional development, and led to increased commercial thinking among Kenyan fish farmers. Indeed, national aquaculture production grew from 1,000 MT/y in 2000 (equivalent to 1% of national fish production) to 12,000 MT/y, representing 7% of the national harvest, in 2010. The production is projected to hit 20,000 MT/y, representing 10% of total production and valued at USD 22.5 million over the next 5 years. The dominant aquaculture systems in Kenya include earthen and lined ponds, dams, and tanks distributed across the coun- try. The most commonly farmed fish species are Nile tilapia Oreochromis niloticus, which accounts for about 75% of production, followed by African catfish Clarias gariepinus, which contributes about 21% of aquaculture production. Other species include common carp Cyprinus carpio, rainbow trout Oncorhynchus mykiss, koi carp Cyprinus carpio carpio, and goldfish Carassius auratus. Recently, Kenyan researchers have begun culturing native fish species such as Labeo victorianus and Labeo cylindricus at the National Aquaculture Research Development and Training Centre in Sagana. Apart from limited knowledge of modern aquaculture technology, the Kenyan aquaculture sector still suffers from an inadequate supply of certified quality seed fish and feed, incomprehensive aquaculture policy, and low funding for research. Glaring opportunities in the Kenyan aquaculture industry include the production of live fish food, e.g., Artemia, daphnia and rotifers, marine fish and shellfish larviculture; seaweed farming; cage culture; integrated fish farming; culture of indigenous fish species; and investment in the fish feed industry.
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An investigation of oxygen enhancement ratio modeling for proton dose calculation
Yoo Denis,Rah Chang Ju,Lee Erick,Kim Ji Hwan,Park Jeong Hoon,Min Byung Jun 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.11
Range uncertainty due to variations in the relative biological efectiveness is considered a signifcant issue in proton therapy. This study aims to investigate the efects of the hypoxic fraction of a tumor volume and its fractionation efects on the oxygen enhancement ratio (OER) in the OER modeling of proton beams. We calculated OERs for proton beams in relation to increases in the hypoxic tumor volume. A voxelized three-dimensional cell modeling was used to calculate the oxygen tension for each voxel. The linear energy transfer (LET) and dose distributions were fxed for each round of calculation. Linear–quadratic (LQ) and universal–survival curve (USC) models were used to compare the efects of the hypoxic fraction of a tumor volume in four clinical cases: chordoma, prostate, lung, and head and neck. In addition, the fractionation efect on the OER was investigated for static and local oxygenation change (LOC) scenarios. The OERs obtained using the LQ model for fractions between 3 and 9 were in the range of 2.12–2.44 with an LET of 3 keV/μm. The OERs obtained using the USC model showed no signifcant diference from those obtained using the LQ model. The increasing values of OER obtained with increasing hypoxic tumor volume did not appear to depend on the tumor type. The OER increased with a decrease in the number of fractions (increase in fraction dose) in our model. The LOC was also found to reduce the OER values as opposed to static cases. The OER for proton beams may be increased in hypo-fractionation in case of a large hypoxic tumor volume. The OER should be considered to optimize treatment dose calculation, especially for hypo-fractionated regime in proton beam therapy.
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