J. Pedersen : Israel, its Life and Culture, vols. I-II(1926), III-IIII(1940)

J. Pedersen 한신대학교 한신신학연구소 1960 신학연구 Vol.6 No.-

이중선체(二重船體) 유조선(油槽船)의 충돌강도해석(衝突强度解析)

백점기,J.K. Paik,P.T. Pedersen 대한조선학회 1995 大韓造船學會 論文集 Vol.32 No.1

본 논문에서는 이상화구조요소법을 적용하여 이중선체 유조선의 충돌손상 해석기법을 개발하고, 모형실험결과와의 비교를 통하여 개발한 해석기법의 정도를 검증한 뒤 4만톤급 컨테이너선의 선수가 이중선체 VLCC의 선측을 충돌할때의 손상거동을 각종설계인자(이중선측폭, 선측 부재치수등)를 변화시켜 가면서 시리즈해석을 수행하여 그 특성을 분석하였다. 본 해석법은 항복, 압괴(crushing), 파단(rupture), 국부 및 전체파손의 상관효과, 변형속도(strain-rate) 영향, gap/contact조건등을 고려하고 있으며, 소요계산시간이 유한요소법에 비해 극히 짧고 해석정도도 높으므로 실제선박의 충돌문제에 대한 구조설계 및 안전성 평가시에 유용하게 적용할 수 있는 "설계응용을 겨냥한 충돌해석방법"(design-oriented collision analysis procedure)이라 할 수 있다. A design-oriented method for analysis of the structural damage due to ship collisions is developed by using the idealized structural unit method(ISUM). The method takes into account yielding, crushing, rupture, the coupling effects between local and global failure of the structure, the influence of strain-rate sensitivity and the gap/contact conditions. The method is verified by a comparison of experimetal and numerical results obtained from test models of double-skin plated structures in collision/grounding situations with the present solutions. As an illustrative example, the method has been used for analyses of a side collision of a double-hull tanker. Several factors affecting ship collision response. namely the collision speed and the scantlings/arrangements of strength members, are discussed.

三重船體 油槽船의 衝突强度解析

백점기(J. K. Paik),P. T. Pedersen 대한조선학회 1995 大韓造船學會 論文集 Vol.32 No.1

Ultimate Compressive Strength of a Plate Element with Complex Shape of the Initial Deflection

Paik, J. K.,Pedersen, P. T. 釜山大學校 生産技術硏究所 1995 生産技術硏究所論文集 Vol.47 No.

A simplified procedure for prediction of the ultimate compressive strength of plate elements with complex shape of the initial deflection is described. The procedure consists of the elastic large deflection theory and the rigid-plastic analysis based on the collapse mechanism taking into account large deformation effects. By taking only one component for the selected deflection function, the computer time for the elastic large deflection analysis will be drastically reduced. The validity of the procedure is checked by comparing the present solutions with the finite-element results for actual ship panels with complex shapes of measured initial deflection. It is concluded that the proposed procedure provides quite accurate solutions for the ultimate loads with extremely short computer time. 본 논문에서는 복잡한 형상의 초기처짐을 가진 선체 판요소의 압축최종강도를 효율적으로 계산할 수 있는 방법을 개발하였다. 본 계산법에서는 먼저 탄성대처짐해석과 소성붕괴해석을 별도로 수행한뒤 이들 해석결과를 조합하여 그 교차점을 최종강도로 간주한다. 이때 판부재에 존재하는 복잡한 형상의 초기처짐을 Fourier급수로 전개하여 나타내며, 탄성대처짐해석은 초기처짐항간의 상관효과를 무시하여 한개의 초기처짐항만을 고려하여 수행함으로써 수치계산시간을 극단적으로 줄였다. 물론 탄성대처짐해석은 모든 초기처짐항에 대하여 개별적으로 수행하며, 압축최종강도의 해는 각 초기처짐항에 대해 계산된 값중의 최소치를 취하면 된다. 본 계산법의 정도와 유용성을 복잡한 형상의 초기처짐을 가진 실제 선체 판부재를 대상으로 탄소성 대변형 유한요소해석법에 의해 계산된 결과와 비교하여 검증하였으며, 그 결과 본 계산법은 극히 짧은 계산시간내에 높은 정도의 결과를 준다는 것을 확인하였다.

Improving Participation in Colorectal Cancer Screening: a Randomised Controlled Trial of Sequential Offers of Faecal then Blood Based Non-Invasive Tests

Symonds, Erin L,Pedersen, Susanne,Cole, Stephen R,Massolino, Joseph,Byrne, Daniel,Guy, John,Backhouse, Patricia,Fraser, Robert J,LaPointe, Lawrence,Young, Graeme P Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.18

Background: Poor participation rates are often observed in colorectal cancer (CRC) screening programs utilising faecal occult blood tests. This may be from dislike of faecal sampling, or having benign bleeding conditions that can interfere with test results. These barriers may be circumvented by offering a blood-based DNA test for screening. The aim was to determine if program participation could be increased by offering a blood test following faecal immunochemical test (FIT) non-participation. Materials and Methods: People were invited into a CRC screening study through their General Practice and randomised into control or intervention (n=600/group). Both groups were mailed a FIT (matching conventional screening programs). Participation was defined as FIT completion within 12wk. Intervention group non-participants were offered a screening blood test (methylated BCAT1/IKZF1). Overall participation was compared between the groups. Results: After 12wk, FIT participation was 82% and 81% in the control and intervention groups. In the intervention 96 FIT nonparticipants were offered the blood test - 22 completed this test and 19 completed the FIT instead. Total screening in the intervention group was greater than the control (88% vs 82%, p<0.01). Of 12 invitees who indicated that FIT was inappropriate for them (mainly due to bleeding conditions), 10 completed the blood test (83%). Conclusions: Offering a blood test to FIT non-participants increased overall screening participation compared to a conventional FIT program. Blood test participation was particularly high in invitees who considered FIT to be inappropriate for them. A blood test may be a useful adjunct test within a FIT program.

Adsorption differences between low coverage enantiomers of alanine on the chiral Cu{421}R surface

Gladys, M.,Han, J.,Pedersen, T.,Tadich, A.,O'Donnell, K.,Thomsen, L. Royal Society of Chemistry 2017 Physical chemistry chemical physics Vol.19 No.21

Safety guidelines of ultimate hull girder strength for grounded container ships

Kim, D.K.,Pedersen, P.T.,Paik, J.K.,Kim, H.B.,Zhang, X.,Kim, M.S. Elsevier 2013 Safety science Vol.59 No.-

Various accidents commonly occur on operating ships. The structural damage caused by such accidents is often accompanied by casualties and serious pollution. In this regard, an accidental risk-based approach that is in line with the Goal Based Standard (GBS) of the International Maritime Organization (IMO) is being developed in the literature. In this paper, the residual ultimate longitudinal strength versus grounding damage index diagram (R-D diagram) for container ships is established as per the method of Paik et al. (2012). The proposed R-D diagram should be useful for defining acceptance damage criteria and making rapid salvage plans or rescue schemes for container ships that have sustained a grounding accident.

Validation and Recommendation of Methods to Measure Biogas Production Potential of Animal Manure

Pham, C.H.,Triolo, J.M.,Cu, T.T.T.,Pedersen, L.,Sommer, S.G. Asian Australasian Association of Animal Productio 2013 Animal Bioscience Vol.26 No.6

In developing countries, biogas energy production is seen as a technology that can provide clean energy in poor regions and reduce pollution caused by animal manure. Laboratories in these countries have little access to advanced gas measuring equipment, which may limit research aimed at improving local adapted biogas production. They may also be unable to produce valid estimates of an international standard that can be used for articles published in international peer-reviewed science journals. This study tested and validated methods for measuring total biogas and methane ($CH_4$) production using batch fermentation and for characterizing the biomass. The biochemical methane potential (BMP) ($CH_4$ NL $kg^{-1}$ VS) of pig manure, cow manure and cellulose determined with the Moller and VDI methods was not significantly different in this test (p>0.05). The biodegradability using a ratio of BMP and theoretical BMP (TBMP) was slightly higher using the Hansen method, but differences were not significant. Degradation rate assessed by methane formation rate showed wide variation within the batch method tested. The first-order kinetics constant k for the cumulative methane production curve was highest when two animal manures were fermented using the VDI 4630 method, indicating that this method was able to reach steady conditions in a shorter time, reducing fermentation duration. In precision tests, the repeatability of the relative standard deviation (RSDr) for all batch methods was very low (4.8 to 8.1%), while the reproducibility of the relative standard deviation (RSDR) varied widely, from 7.3 to 19.8%. In determination of biomethane concentration, the values obtained using the liquid replacement method (LRM) were comparable to those obtained using gas chromatography (GC). This indicates that the LRM method could be used to determine biomethane concentration in biogas in laboratories with limited access to GC.

Biogas Production from Vietnamese Animal Manure, Plant Residues and Organic Waste: Influence of Biomass Composition on Methane Yield

T.T.T. Cu,T.X. Nguyen,J.M. Triolo,L. Pedersen,V.D. Le,P.D. Le,S.G. Sommer 아세아·태평양축산학회 2015 Animal Bioscience Vol.28 No.2

Anaerobic digestion is an efficient and renewable energy technology that can produce biogas from a variety of biomasses such as animal manure, food waste and plant residues. In developing countries this technology is widely used for the production of biogas using local biomasses, but there is little information about the value of these biomasses for energy production. This study was therefore carried out with the objective of estimating the biogas production potential of typical Vietnamese biomasses such as animal manure, slaughterhouse waste and plant residues, and developing a model that relates methane (CH4) production to the chemical characteristics of the biomass. The biochemical methane potential (BMP) and biomass characteristics were measured. Results showed that piglet manure produced the highest CH4 yield of 443 normal litter (NL) CH4 kg–1 volatile solids (VS) compared to 222 from cows, 177 from sows, 172 from rabbits, 169 from goats and 153 from buffaloes. Methane production from duckweed (Spirodela polyrrhiza) was higher than from lawn grass and water spinach at 340, 220, and 110.6 NL CH4 kg–1 VS, respectively. The BMP experiment also demonstrated that the CH4 production was inhibited with chicken manure, slaughterhouse waste, cassava residue and shoe-making waste. Statistical analysis showed that lipid and lignin are the most significant predictors of BMP. The model was developed from knowledge that the BMP was related to biomass content of lipid, lignin and protein from manure and plant residues as a percentage of VS with coefficient of determination (R-square) at 0.95.This model was applied to calculate the CH4 yield for a household with 17 fattening pigs in the highlands and lowlands of northern Vietnam.

Local electronic structure of Mn dopants in ZnO probed by resonant inelastic x-ray scattering

Chang, G S,Kurmaev, E Z,Jung, S W,Kim, H-J,Yi, G-C,Lee, S-I,Yablonskikh, M V,Pedersen, T M,Moewes, A,Finkelstein, L D IOP Pub 2007 Journal of physics, an Institute of Physics journa Vol.19 No.27

<P>The electronic structure of Mn dopants in ZnO epitaxial thin films synthesized at different temperatures has been investigated using resonant inelastic x-ray scattering. The resulting Mn L<SUB>2,3</SUB> x-ray emission spectra of Zn<SUB>0.8</SUB>Mn<SUB>0.2</SUB>O (resonantly excited at L<SUB>2</SUB> and L<SUB>3</SUB> absorption edges) reveal different spectral features depending on the growth temperature of the films. The relative integral intensity ratio of Mn L<SUB>2</SUB> to Mn L<SUB>3</SUB> emission lines is greatly suppressed in the case of nonmagnetic Zn<SUB>0.8</SUB>Mn<SUB>0.2</SUB>O grown at 700 °C due to L<SUB>2</SUB>L<SUB>3</SUB>M<SUB>4,5</SUB> Coster–Kronig transitions. The ferromagnetic sample grown at 600 °C exhibits a normal oxide structure. The results suggest that a high growth temperature causes direct Mn–Mn bonds from the segregation of Mn atoms in ZnO. Therefore the disappearance of ferromagnetism in Mn-doped ZnO can be attributed to antiferromagnetic Mn–Mn exchange interactions due to the inhomogeneous local environment around the Mn impurities.</P>