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3차원 해수유동모델에 의한 제주항 연안해역의 해수순환 특성
양태혁 ( Tai Hoek Yang ),양성기 ( Sung Kee Yang ) 한국환경과학회 2011 한국환경과학회지 Vol.20 No.6
The characteristics of circulation in the coastal area of Jeju Harbor in Korea was examined using the Princeton Ocean Model(POM) with a sigma coordinate system. The result of numerical analysis well corresponded to the observed current data. The velocity at offshore was stronger compared to coastal area during the both period of in maximum flood and maximum ebb of spring tide. According to mean wind velocity, the tidal velocity at the shallow area of Jocheon was slightly increasing during maximum ebb. The effect of wind on the circulation was stronger in shallow area and showed rapid change with depth.
van der Hoek, R.,Muttetuwegama, G.S.,Schiere, J.B. Asian Australasian Association of Animal Productio 1988 Animal Bioscience Vol.1 No.4
Fifty-six lactating Surti buffaloes, fed rice straw, were allocated to seven treatment groups as follows: 1. Straw supplemented with 2% urea (SS) + 1.5kg rice bran (RB) 2. Straw treated with 4% urea in an open stack (TS open) 3. TS open + 1.5 kg RB 4. TS open + 3.0 kg RB 5. TS open + 1.5 kg RB + 3.0 kg Gliricidia (Gl) 6. Straw treated with 4% urea in a closed pit (TS closed) 7. TS closed + 1.5 kg RB + 3.0 kg Gl Milk production, butterfat percentage and liveweight gain of cows and calves were measured and tested with analysis of variance. The results are: - The animals on urea treated straw (group 2) had a higher milk production (p<0.05), higher butterfat production (p<0.05) and less liveweight gain loss (p<0.05) than the animals on urea supplemented straw (group 1). Butterfat percentage also increased by treatment, although not significantly (p>0.05). - Increasing levels of rice bran (groups 3 and 4 compared to 2) increased total milk production and milked quantity of butterfat, while butterfat percentage decreased (p < 0.05). - Milk production increased (p <0.05) with extra rice bran added (group 4 compared to 3), but was not affected (p > 0.05) by Gliricidia addition (group 5 compared to 3). Butterfat percentage dropped with extra rice bran supplement (p <0.05). The lack of response to Gliricidia indicated that protein is not limiting in treated straw, or that Gliricidia protein is partly insoluble. - System of treatment had no effect on milk production (p >0.05), while supplementation with 1.5 kg RB and 3.0 kg Gliricidia increased production and caused a lower butterfat percentage (p <0.05) (groups 2, 5, 6 and 7 compared). A significant (p <0.05) interaction treatment system x supplementation was present. It was concluded, that both treatment and supplementation did affect milk production as well as milk composition. Gliricidia addition gave less effect than rice bran, indicating different requirements for starchy substances in the feed. Treatment of straw does not negatively affect butterfat production, it can increase butterfat production and even butterfat percentage.
Optimality Theory and Human Sentence Processing: Towards a Cross-Modular Analysis of Coordination
( John C. J. Hoeks ),( Petra Hendriks ) 서울대학교 인지과학연구소 2011 Journal of Cognitive Science Vol.12 No.1
In this paper we propose a model of human sentence processing that is based on Optimality Theory (OT). In contrast to most other OT approaches to language processing, we use constraints from OT semantics rather than OT syntax to address on-line comprehension. We illustrate the workings of our model by investigating the processing of coordinated structures. The psycholinguistic evidence that is currently available suggests that the on-line comprehension of coordination is influenced by constraints from many different information sources: pragmatics, discourse semantics, lexical semantics, and syntax. The model we propose formalizes this cross-modular interaction of constraints, and yields concrete predictions with respect to both intermediate parsing preferences and final interpretations. Our ultimate aim is to develop a model of processing performance is that at the same time a fully functional model of linguistic competence.
Tharmaraj, J.,van der Hoek, R.,Sewalt, V.J.H.,Schiere, J.B. Asian Australasian Association of Animal Productio 1989 Animal Bioscience Vol.2 No.2
Forty bull calves of Sahiwal crosses were fed either urea treated or untreated rice straw with 4 levels of Gliricidia (0, 1, 2, and 4 kg fresh material). Dry matter intake (DMI) of straw and Gliricidia was measured during 2 periods. Straw intakes in period 1 and 2 were significantly different (P<0.001). Supplementation of Gliricidia depressed the DMI of straw during the second period (P<0.01), but not in the first period. Urea-ammonia treatment increased straw intake and total intake in both periods, but the increase in dry matter digestibility (DMD) of the ration was not significant (P>0.05). Liveweight gain (LWG) was increased significantly, both by urea ammonia treatment (P<0.01) and by supplementation with Gliricidia (P<0.001). Animals on treated straw gained on an average $137\;g{\cdot}d^{-1}$ more than those on untreated straw.
NEW INEQUALITIES FOR THE MOMENTS OF GUESSING MAPPING
Dragomir, S.S.,Hoek, J. Van Der The Youngnam Mathematical Society Korea 1998 East Asian mathematical journal Vol.14 No.1
Using some inequalities for real numbers and integrals we print out here some new inequalities for the moments of guessing mapping which complement the recent results of Arikan [1] and Boztas [2].
Permeability of Interacting Nanoparticle deposits in Crossflow Membrane Filtration
Su Han Kim,Eric M. V. Hoek 대한환경공학회 2005 대한환경공학회 학술발표논문집 Vol.2005 No.12
A simple, analytical, and predictive particle deposition and flux decline model based on particle interactions in colloidal cake layer and the hydraulic resistance of particle layer has been developed. Well-controlled laboratory-scale microfiltration data are used to verify the model. In the model, the net particle flux toward the membrane surface is determined from the combined effects of permeate drag, inertial lift, shear-induced diffusion, Brownian diffusion, and electric double layer forces; this flux determines the rate of cake layer accumulation on the membrane. Cake structure (average porosity and thickness) is determined by considering hydrodynamic and colloidal interactions between particles within colloidal cake layers. The transient flux decline is then predicted using conventional sphere-in-cell drag model.
Lee, Kwang Jae,Kim, Yeong Bae,Kim, Jang Hee,Kwon, Hoek Chun,Kim, Dong Kyu,Cho, Sung Won Blackwell Publishing Asia 2008 Journal of gastroenterology and hepatology Vol.23 No.11
<P>Abstract</P><P>Background/Aims: </P><P>Psychological factors and subtle histopathological changes have been implicated in irritable bowel syndrome (IBS). The aims of the present study were to investigate whether the numbers of enterochromaffin (EC) cells, mast cells, and lamina propria T lymphocytes are altered in IBS, and evaluate the relationship of such alterations with psychological factors.</P><P>Methods: </P><P>Forty-two consecutive IBS patients (M : F = 17:25, mean age 48 years) fulfilling the Rome III criteria and twelve asymptomatic healthy controls underwent rectal biopsy. Immunostaining was performed for EC cells, mast cells, and lamina propria T lymphocytes.</P><P>Results: </P><P>The IBS group included five post-infectious (PI) IBS and 37 non-PI IBS patients. Significantly more EC cells, mast cells and lamina propria T lymphocytes were observed in PI IBS patients. Mast cells significantly increased in non-PI IBS-D (diarrhea) patients, but not in non-PI IBS-C (constipation) and non-PI IBS-M (mixed) patients. Enterochromaffin cell numbers were not significantly altered in non-PI IBS patients. Anxiety and depression scores did not differ between IBS patients with and without abnormal increase in EC cell or mast cell counts, defined as more than the mean of controls + 2 standard deviations. Enterochromaffin cell, mast cell, or lamina propria T lymphocyte numbers were poorly correlated with anxiety and depression scores in the IBS group.</P><P>Conclusions: </P><P>Enterochromaffin cells, mast cells, and lamina propria T lymphocytes significantly increase in PI IBS, whereas only mast cells significantly increase in non-PI IBS-D. Such histopathological changes do not seem to be directly associated with psychological factors.</P>
Jun, Dukwoo,Kim, Youngo,Hafeznezami, Saeedreza,Yoo, Kwansun,Hoek, Eric M.V.,Kim, Jeonghwan Elsevier 2017 Journal of membrane science Vol.543 No.-
<P><B>Abstract</B></P> <P>Herein, we report on a mechanism of inorganic fouling observed in a pilot-scale anaerobic membrane bioreactor (AnMBR) treating high strength leachate from domestic food waste. Long-term operation (around 700 days) of the AnMBR encountered frequent, sudden irreversible fouling events driven by biologically induced mineral scaling which required intense chemical cleaning to recover membrane permeability. Mineral scale formation occurred on the surface and within pores of 100kDa ultrafiltration (UF) membranes. The UF membrane rejected phosphorus, calcium and magnesium up to 97%, 92% and 60%, respectively, which suggests that these ions either precipitated ahead of the UF membranes and existed in a colloidal state and/or precipitated and were retained within UF membrane pores. Microscopic and spectroscopic analyses combined with geochemical modeling confirmed hydroxyapatite, dolomite and struvite were the prevailing mineral precipitates coming from the methanogenic digester; these minerals were embedded in the cake layer and found within membrane pores. Geochemical modeling suggests that slower-growing minerals such as dolomite might precipitate within the membrane pore structures possibly causing membrane pore constriction and/or blocking. Combined use of HOCl (to oxidize and remove organic matter) and citric acid (to dissolve minerals and chelate divalent ions) proved the most effective cleaning regime to recover membrane permeability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The biologically induced scaling in anaerobic membrane bioreactor is investigated. </LI> <LI> Serious membrane scaling occurs due to robust mineralization in anaerobic process. </LI> <LI> Slower-growing minerals are regarded as a main cause for membrane pore blocking. </LI> <LI> Combined use of HOCl and citric acid prove most effective at recovering permeability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>