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황인준,박문창,백혜자 한국수산과학회 2009 Fisheries and Aquatic Sciences Vol.12 No.4
As a result of human industrial development, carbon dioxide (CO2) is currently accumulating in the atmosphere and dissolving into the oceans. Sequestration into the deep sea has been proposed as a possible solution to this increasing atmospheric CO2, although the impact of such a program on marine ecosystems is unknown. We examined the effects of increased CO2 levels on the growth of the olive flounder, Paralichthys olivaceus. Juvenile olive flounder 40 days post hatching were exposed to two levels of CO2 (3.60¬-7.55 and 4.05¬-11.46 kPa) in running seawater for 26 days. During the exposure period, the pH and CO2 levels of the water were measured, and the numbers of dead individuals were counted in each aquarium. Following the exposure period, the total lengths (mm) and body weights (mg) of the juvenile fish were measured. Both CO2 treatments significantly increased fish mortality compared to controls (19.87±4.53% vs. 7.14% and 75.96±1.36% vs. 7.14% for high and low doses, respectively). After the high CO2 treatment, total length (14.98±6.58 mm vs. 19.52±1.83 mm) and body weight (28.92±13.85 mg vs. 67.35±18.32 mg) of the exposed flounder were reduced compared to the control fish; however, no significant differences in these values were observed after the low CO2 dose. These results suggested that CO2 exposure inhibits growth in the juvenile stage and that CO2-enriched seawater is toxic in the early life stages of olive flounder.
Presentation Planning for Distributed VoD Systems
황인준,변광준,Hwang, In-Jun,Byeon, Gwang-Jun 한국정보처리학회 2000 정보처리학회논문지 Vol.7 No.2
A distributed video-on-demand (VoD) system is one where collection of video data is located at dispersed sites across a computer network. In a single site environment, a local video server retrieves video data from its local storage device. However, in the setting of a distributed VoD system, when a customer requests a movie from the local server, the server may need to interact with other servers located across the network. In this paper, we present three types of presentation plans that a local server must construct in order to satisfy the customer request. Informally speaking, a presentation plan is a temporally synchronized detailed sequence of steps that the local server must perform for presenting the requested movie to the customer. This involves obtaining commitments from other video servers, obtaining commitments from the network service provider, as well as making commitments of local resources, within the limitations of available bandwidth, available buffer, and customer data consumption rates. Furthermore, for evaluating the goodness of a presentation plan, we introduce two measures of optimality for presentation plans: minimizing wait time for a customer, and minimizing access bandwidth is used. We develop algorithms to compute optimal presentation plans for all three types, and carry out extensive experiments to compare their performance. We have also mathematically proved certain results for the presentation plans that had previously been verified experimentally in the literature.
Bisphenol A와 nonylphenol이 노래미, Hexagrammos agrammus 성숙기 난모세포의 스테로이드 생성과정에 미치는 영향
황인준,김형배,백혜자 한국발생생물학회 2008 발생과 생식 Vol.12 No.3
Endocrine disrupting chemiclas(EDCs) such as bisphenol A(BPA) and nonylphenol(NP) have estrogenic activity and can alter reproduction in fish. In the present study, the effects of BPA and NP on in vitro steroid production from oocytes of maturation stage(oocyte diameter≒1.88 mm) from the greenling(Hexagrammos agrammus) were evaluated. Oocytes were incubated with different concentrations of BPA and NP(0.1, 1, 10, 100 and 1000 ng/mL) in the presence or absence of 50 IU human chorionic gonadotropin(HCG) for 48 hours. After incubation, levels of 17α, 20β-dihydroxy- 4-pregnen-3-one(17α20βOHP), estradiol-17β(E2) and testosterone(T) from incubated media were quantified by radioimmunoassay(RIA). In BPA treatment, 100 ng/mL of BPA stimulated E2 production regardless HCG supplement. Every concentration of BPA inhibited T production without HCG although 0.1 ng/mL of BPA stimulated T production with HCG. In NP treatment, 10 ng/mL of NP stimulated 17α20βOHP and T production without HCG. 1 ng/mL of NP inhibited E2 production. Taken toghther, these results suggest that BPA might have weak estrogen-agonistic effect and NP has estrogen- antagonistic effect at final oocyte maturation stage of H. agrammus
황인준,이시우,Young Sim Han,Kyeong Hwan Kim 한국수산과학회 2021 Fisheries and Aquatic Sciences Vol.24 No.11
In this study, the reproductive behavior and embryonic and larval development of the short ninespine stickleback Pungitius kaibarae was described and illustrated based on observations during spawning, hatching, and larval rearing trials. Adult P. kaibarae were collected downstream in Jinhae during the reproductive season (April–May). Males had nuptial coloration on their entire black bodies, with blue dorsal spines and yellow eyes, whereas females had a brown spotted pattern on their bodies. Males built nests on the stems of water weeds and attracted females. Fertilization occurred in the nest immediately after spawning, and males guarded the eggs until hatching. The fertilized eggs of P. kaibarae were spherical, demersal, adhesive, and transparent, and each egg measured 1.43 ± 0.07 mm in diameter. The morula, blastula, and gastrula stages, as well as hatching began at 5, 18.5, 21.5, and 96 post fertilization (HPF) , respectively, at 20.0 ± 0.5℃. The newly hatched larvae had a total length (TL) of 5.67 ± 0.50 mm, with a yolk volume of 0.583 ± 0.059 mm3. Their mouths and anuses had not yet opened. At 2 days posthatching (days post hatching, DPH), the yolk was completely absorbed and the larvae began to feed exogenously. Pigmentation was observed in freshly hatched larvae 4 h after hatching, with the presence of eight areas with a dotted pattern on the dorsal surface of the larvae and dispersed spots on the head and yolk sac. At 30 DPH, the TL of the juveniles was 21.34 ± 1.70 mm. The nest area and number of eggs were 259.56 ± 101.39 mm2 (75.18–506.04) and 155.33 ± 114.12 (0–437), respectively.
황인준,송지한,김진성,김종호 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10
질소산화물(NOx)은 일반적으로 연소과정에서 열(thermal) NOx로 발생하며, 제조공정에서도 발생하는 것으로 알려져 있다. 저감기술은 선택적무촉매환원법(SNCR)과 선택적촉매환원법(SCR) 등이 있다. 본 연구는 유기화학물질 제조공정에서 발생하는 NO를 처리하기 위하여 오존(O₃)을 이용해 NO를 NO₂로 빠르게 산화시키고 환원제를 이용하여 습식으로 처리하는 실험을 진행하였다. 실험장치는 O₃ 발생기, 반응기, 흡수탑으로 구성하였다. O₃은 DBD (dielectric barrier discharge)에 순산소(O₂)를 투입하여 발생시켰고 반응기와 흡수탑(D:400 mm, H: 1,650 mm)으로 제작하였으며 흡수탑의 환원제로는 아황산나트륨(Na₂SO₃)을 사용하였다. 실험조건으로 유기화학물질 제조공정에서 NO와 VOCs가 동시에 발생함으로 O₃ 투입 당량비와 액기비 변화에 따라 NO와 VOCs의 제거효율을 조사하였다.