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Suh, Hyoung Suk,Kang, Dong Hun,Jang, Jaewon,Kim, Kwang Yeom,Yun, Tae Sup Elsevier 2017 ADVANCES IN WATER RESOURCES Vol.110 No.-
<P><B>Abstract</B></P> <P>The random shapes of pore throats in geomaterials hinder accurate estimation of capillary pressure, and conventional pore network models that simply use the Young–Laplace equation assuming circular pore throats overestimate the capillary pressure. As a solution to this problem that does not complicate the pore network model or slow its implementation, we propose a new morphological analysis method to correlate the capillary pressure at an irregular pore channel with its cross-sectional geometry using lattice Boltzmann (LB) simulation and Mayer and Stowe–Princen theory. Geometry-based shape factors for pore throats are shown here to correlate strongly with the capillary pressure obtained by LB simulation. Water retention curves obtained by incorporating the morphological calibration into conventional pore network simulation and their correlative scheme agree well with experimental data. The suggested method is relevant to pore-scale processes such as geological CO<SUB>2</SUB> sequestration, methane bubbling from wetlands, and enhanced carbon recovery.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Lattice Boltzmann simulation can accurately compute capillary pressure in irregular pore channels. </LI> <LI> Our morphological analysis estimates the effective pore throat shape to compute capillary pressure without lattice Boltzmann simulation. </LI> <LI> Pore network models calibrated by these specific capillary pressures produce water retention curves similar to experiment. </LI> </UL> </P>
Suh, Hyoung Suk,Kim, Kwang Yeom,Lee, Junhwan,Yun, Tae Sup Elsevier 2017 Engineering Geology Vol.220 No.-
<P><B>Abstract</B></P> <P>The study presents the quantification of shape parameters in sands. Natural sands, crushed sands, and glass beads are subjected to 2D microscopic and 3D X-ray computed tomographic imaging. Parameters of sphericity, elongation and slenderness are selected for analyzing the bulk forms and roundness is selected to quantify the angularity. Relationship among 2D shape parameters confirms that sphericity, elongation and slenderness are independent with roundness. Critical state friction angles are obtained by a direct shear test and void ratio ranges are measured as well. Both sphericity and roundness denote the strong linearity with void ratio range (<I>e</I> <SUB> <I>max</I> </SUB> − <I>e</I> <SUB> <I>min</I> </SUB>) bounded 0.15 and critical state friction angle (<I>ϕ</I> <SUB> <I>cs</I> </SUB>) delineated by 20° at the unity, emphasizing that readily computable sphericity is sufficient to estimate properties of sands even without roundness. The multiple 2D projections of 3D images and their correlation for different orientation support that either bulk form or angularity in 2D images are acceptable enough to establish correlations between shape parameters and properties in sands. It implies that 2D quantification of particle shape is rational and can be used to approximate soil properties without conducting the laboratory experiments.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Sphericity and roundness are independent with each other while round particles tend to be spherical in sands </LI> <LI> Computing sphericity is sufficient to establish correlation with soil properties rather than hardly quantifiable roundness </LI> <LI> Quantification of particle shape in 2D is rational to comprehend shape-dependent properties </LI> </UL> </P>
Suh, Hyoung Suk,Yun, Tae Sup Elsevier 2018 Computers and geotechnics Vol.95 No.-
<P><B>Abstract</B></P> <P>Accurate estimation of capillary pressures at pore throats during pore network simulation is made by acquiring the effective distribution of non-wetting fluid and its effective shape factor. The suggested method is applied to authentic pore structures of synthetically assembled sphere packings and natural sands. Results highlight that the irregularity of pore throat tends to increase as particle shape becomes irregular while the effective shape factor of 0.8 can be consistently applicable regardless of particle shape. The modified water retention curve well captures experimental results. Packing density and gradation effects are less predominant compared with the effect of capillary pressure correction.</P>
이형숙 ( Hyoung Suk Lee ),정재욱 ( Jae Wook Jung ),신도현 ( Do Hyun Sin ),송현주 ( Hyun Ju Song ),최정희 ( Jeong Hee Choi ),서유진 ( Yoo Jin Suh ),남동호 ( Dong Ho Nahm ),박해심 ( Hae Sim Park ),서창희 ( Chang Hee Suh ) 대한류마티스학회 2003 대한류마티스학회지 Vol.10 No.2
Adult-onset Still`s disease (AOSD) is a multi-systemic inflammatory disorder characterized by high spiking fever, evanescent salmon-colored rash, arthralgia or arthritis, leukocytosis and the involvement of various organs. However, leukopenia is rarely associated with AOSD. It may be due to hemophagocytic syndrome, which usually present with acute febrile illness, pancytopenia, hepatosplenomegaly, and hyperferritinemia. We report a case of 28-year-old man with AOSD and leukopenia. There is no evidence of other causes of cytopenia and hemophagocytosis in bone marrow examination. Leukopenia can be the initial presentation of AOSD.
Comparison of Image Quality of the Amorphous Silicon DR System and the Film-screen Systems
Suh,Tae-Suk,Youn,Je-Woong,Choe,Bo-Young,Shin,Kyung-Sub,Kim,Hong-Kwon,Han,Yong-Woo,Lee,Hyoung-Koo,Mun,In k.,Nam,Seung-Bae 대한방사선 방어학회 2000 방사선방어학회지 Vol.24 No.3
비정질 실리콘 방사선 촬영기와 기존 X-ray filmrh과의 영상질 비교를 통하여 시스템의 성능을 평가하였다. 다양한 영상질 평가를 위하여 MTF (Modulation Transfer Function), NPS(Noise Power Spectrum), Contrast를 측정하여 계산하였다. 실험결과 DR과 MTF 는 기존 film-screen system과 유사하였다. Noise 특성은 두 시스템 모두 quantum noise가 주를 이뤘으며, 특히 DR에서는 기존 film-screen 시스템보다 높은 대조도를 보였다. 이와 같이 DR에서는 기존 ilm-screen 시스템고 유사한 해상도와 영상처리를 통해 같은 촬영조건에서도 향상된 대조도의 영상을 얻을 수 있었다. 본 연구를 통하여 의학적 활용과 관련된 DR시스템의 성능에 대한 유용한 정보를 제공할 수 있으리라 기대한다. System performances in terms of image quality between an amorphous silicon DR system and a conventional film-screen system were evaluated. Various aspects of image quality MTF (modulation transfer function), NPS(noise power spectrum), SNR(signal-to-noise ratio) and contrast were measured and calculated. The MTF of the DR system was comparable to the film-screen systems. The noise was mainly dominated by the quantum mottle in both systems and the electronic noise was found in the DR system. The contrast of the DR system was better than the film-screensystems by virtue of high sensitivityh and image processing. Compared to the film-screen systems in general radiography, the DR system had similar resolution and showed better contrast with the same exposure condition after contrast manipulation. The results of this study provide some useful information about the performance of the DR system in connection with medical applications.
Priority Scheduling for a Flexible Job Shop with a Reconfigurable Manufacturing Cell
Hyoung-Ho Doh,Jae-Min Yu,Yong-Ju Kwon,Dong-Ho Lee,Min-Suk Suh 대한산업공학회 2016 Industrial Engineeering & Management Systems Vol.15 No.1
This paper considers a scheduling problem in a flexible job shop with a reconfigurable manufacturing cell. The flexible job shop has both operation and routing flexibilities, which can be represented in the form of a multiple process plan, i.e. each part can be processed through alternative operations, each of which can be processed on alternative machines. The scheduling problem has three decision variables: (a) selecting operation/machine pairs for each part; (b) sequencing of parts to be fed into the reconfigurable manufacturing cell; and (c) sequencing of the parts assigned to each machine. Due to the reconfigurable manufacturing cell’s ability of adjusting the capacity, functionality and flexibility to the desired levels, the priority scheduling approach is proposed in which the three decisions are made at the same time by combining operation/machine selection rules, input sequencing rules and part sequencing rules. To show the performances of various rule combinations, simulation experiments were done on various instances generated randomly using the experiences of the manufacturing experts, and the results are reported for the objectives of minimizing makespan, mean flow time and mean tardiness, respectively.
즐례 : 복막전이를 동반한 그물막의 악성 혈관주위 상피모양세포 종양 1예
장석빈 ( Suk Bin Jang ),서원용 ( Won Yong Suh ),전지현 ( Ji Hyun Jeon ),박건우 ( Keon Woo Park ),임도형 ( Do Hyoung Lim ),남궁환 ( Hwan Namgung ),이순일 ( Soon Il Lee ) 대한내과학회 2014 대한내과학회지 Vol.86 No.1
The World Health Organization (WHO) defines a perivascular epithelioid cell tumor (PEComa) as a mesenchymal neoplasia composed of perivascular epithelioid cells with characteristic morphological and immunohistochemical features. They are rarely malignant. Indeed, only a few cases have been reported in the English literature, and this is the first case of PEComa reported in Korea. A 64-year-old man presented with an abdominal mass and peritoneal seeding. The patient underwent mass excision with descending colon resection and anastomosis. The primary mass and peritoneal seeding was diagnosed as a PEComa histopathologically. Seven months later, he developed liver metastasis and aggravated peritoneal seeding. Here, we report a case of malignant PEComa of the omentum. (Korean J Med 2014;86:96-101)