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Distribution of Larval Dungeness crabs in Glacier Bay, Southeastern Alaska
Park, Wong-Yu,Shirley, Thomas C. The Korean Society of Fisheries and Aquatic Scienc 2007 Fisheries and Aquatic Sciences Vol.10 No.2
Adult Dungeness crabs are restricted primarily in the lower part of Glacier Bay, Alaska, but the interaction of larval dispersion and adult distribution is unknown. To understand the larval occurrence in the upper part of Glacier Bay, Dungeness crab larvae, sea surface temperature (SST), and sea surface salinity (SSS) were collected at 16 near-shore and 12 mid-channel stations in Glacier Bay, southeastern Alaska during six sampling periods from March through August 2000. Each station was visited from one to five times during the entire sampling period. Geographic Information System (GIS) was used to contour SST and SSS distribution in Glacier Bay. Seven to 27 stations were visited during each sampling period. Most larvae (85% were zoeae I) occurred during May 31 to June 14, 2000. Larval density varied from none to $51.4\;100\;m^{-3}$ between stations. A few later stage larvae occurred during later sampling periods. Overall, no relationship between larval densities, and SSS, and SST existed. Larvae occurring in the upper bay were probably transported by tidal currents from the lower bay; adult Dungeness crabs in Glacier Bay have a relatively high density near the mouth of the bay but decrease sharply around 40km north of the mouth. The lack of adult crabs in the upper 60km of the bay may be related to lower salinity, resulting in sharp haloclines, or colder temperatures which are not conducive to survival or growth of either larvae or adults.
Conjugated Polyelectrolytes as Efficient Hole Transport Layers in Perovskite Light-Emitting Diodes
Lee, Bo Ram,Yu, Jae Choul,Park, Jong Hyun,Lee, Seungjin,Mai, Cheng-Kang,Zhao, Baodan,Wong, Matthew S.,Jung, Eui Dae,Nam, Yun Seok,Park, Song Yi,Di Nuzzo, Daniele,Kim, Jin Young,Stranks, Samuel D.,Baza American Chemical Society 2018 ACS NANO Vol.12 No.6
<P>Perovskite-based optoelectronic devices have been rapidly developing in the past 5 years. Since the first report, the external quantum efficiency (EQE) of perovskite light-emitting diodes (PeLEDs) has increased rapidly through the control of morphology and structure from 0.1% to more than 11%. Here, we report the use of various conjugated polyelectrolytes (CPEs) as the hole injection layer in PeLEDs. In particular, we find that poly[2,6-(4,4-bis-potassium butanylsulfonate)-4<I>H</I>-cyclopenta-[2,1-<I>b</I>;3,4-<I>b</I>′]-dithiophene)] (PCPDT-K) transfers holes effectively, blocks electron transport from the perovskite to the underlying ITO layer, and reduces luminescence quenching at the perovskite/PCPDT-K interface. Our optimized PeLEDs with PCPDT-K show enhanced EQE by a factor of approximately 4 compared to control PeLEDs with PEDOT:PSS, reaching EQE values of 5.66%, and exhibit improved device stability.</P> [FIG OMISSION]</BR>
Kim, Eok B.,Lee, Jae-hwan,Trung, Luu Tran,Lee, Wong-Kyu,Yu, Dai-Hyuk,Ryu, Han Young,Nam, Chang Hee,Park, Chang Yong The Optical Society 2009 Optics express Vol.17 No.23
<P>We developed an optical frequency synthesizer (OFS) with the carrier-envelope-offset frequency locked to 0 Hz achieved using the 'direct locking method.' This method differs from a conventional phaselock method in that the interference signal from a self-referencing f-2f interferometer is directly fed back to the carrier-envelope-phase control of a femtosecond laser in the time domain. A comparison of the optical frequency of the new OFS to that of a conventional OFS stabilized by a phase-lock method showed that the frequency comb of the new OFS was not different to that of the conventional OFS within an uncertainty of 5.68x10(-16). As a practical application of this OFS, we measured the absolute frequency of an acetylene-stabilized diode laser serving as an optical frequency standard in optical communications.</P>
Kwon, Sun U.,Hong, Keun-Sik,Kang, Dong-Wha,Park, Jong-Moo,Lee, Ju-Hun,Cho, Yong-Jin,Yu, Kyung-Ho,Koo, Ja-Seong,Wong, K.S. Lawrence,Lee, Seung-Hoon,Lee, Kyung Bok,Kim, Dong-Eog,Jeong, Sang-Wook,Bae, He Ovid Technologies Wolters Kluwer -American Heart A 2011 Stroke Vol.42 No.10
<P>An optimal strategy for management of symptomatic intracranial atherosclerotic stenosis (ICAS) has not yet been established. We compared the efficacy of 2 combinations of antiplatelets, aspirin plus cilostazol (cilostazol group) verus aspirin plus clopidogrel (clopidogrel group), on the progression of ICAS, which is known to be associated with clinical stroke recurrence.</P>
Kim, D.K.,Incecik, A.,Choi, H.S.,Wong, E.W.C.,Yu, S.Y.,Park, K.S. Elsevier 2018 Ocean engineering Vol.157 No.-
<P><B>Abstract</B></P> <P>In the present study, an innovative method for estimating fatigue performance of risers under vortex-induced vibration (VIV) is proposed. Generally, fatigue performance is affected by the surrounding environment such as wind, wave, and current. It is well known that current is the most influential load among all for offshore risers. In structural safety aspect, strength and fatigue are the most important factors for riser design. In addition, fatigue design is affinitive to the VIV phenomenon. For the analysis of fatigue performance of riser, SHEAR7 numerical simulation code which is commonly used in offshore industry is applied. In order to identify the relation between current load and fatigue performance of riser, Fatigue damage versus Current index (F-C) diagram has been proposed. F-C diagram may cover change of current profiles and help predict the fatigue damage under VIV. In case of current profile, a total of sixty cases of current scenarios are considered based on six representative sea-states. The obtained results from this study will be a useful guideline to predict the effect of current on the fatigue performance of riser.</P> <P><B>Highlights</B></P> <P> <UL> <LI> An innovative method for the estimation of fatigue performance of offshore riser is proposed. </LI> <LI> Current index (CI) concept is proposed by considering the parameters of current profile. </LI> <LI> F-C (Fatigue damage vs. Current index) diagrams for offshore riser are established. </LI> <LI> The proposed method shows good agreement with existing method. </LI> <LI> The F-C diagrams will be useful in judging the safety level of offshore riser subjected to VIV fatigue by current load. </LI> </UL> </P>