http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Job Sequencing Problem for Three-Machine Flow Shop with Fuzzy Processing Times
Park, Seunghun,Chang, Inseong,Gen, Mitsuo 한국경영과학회 1993 韓國經營科學會誌 Vol.18 No.1
This paper presents possibilistic job scheduling based on the membership function as an alternative to probabilistic job scheduling and illustrates a methodology for solving job sequencing problem which the opinions of experts greatly disagree in each processing time. Triangular fuzzy numbers are used to represent the processing times of experts. Here, the comparison method is based on the dominance property. The criteria for dominance are presented. By the dominance criteria, for each job, a major TFN and a minor TFN are selected and a pessimistic sequence with major TFNs and an optimistic sequence with minor TFNs are computed. The three-machine flow shop problem is considered as an example to illustrate the approach.
Park, Juhun,Lim, Jong Hyun,Jin, Hye Jun,Namgung, Seon,Lee, Sang Hun,Park, Tai Hyun,Hong, Seunghun The Royal Society of Chemistry 2012 The Analyst Vol.137 No.14
<P>We developed an olfactory-nanovesicle-fused carbon-nanotube-transistor biosensor (OCB) that mimics the responses of a canine nose for the sensitive and selective detection of hexanal, an indicator of the oxidation of food. OCBs allowed us to detect hexanal down to 1 fM concentration in real-time. Significantly, we demonstrated the detection of hexanal with an excellent selectivity capable of discriminating hexanal from analogous compounds such as pentanal, heptanal, and octanal. Furthermore, we successfully detected hexanal in spoiled milk without any pretreatment processes. Considering these results, our sensor platform should offer a new method for the assessment of food quality and contribute to the development of portable sensing devices.</P> <P>Graphic Abstract</P><P>We developed an olfactory-nanovesicle-fused carbon-nanotube-transistor biosensor (OCB) that mimics the responses of a canine nose for the sensitive and selective detection of hexanal, an indicator of the oxidation of food. OCB devices have been utilized to evaluate spoiled milk without any pretreatment. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2an16274a'> </P>
Park, Hyukjin,Hong, Young Joon,Lee, Seunghun,Oh, Tae Ryom,Choi, Jungho,Kim, Minah,Park, Keun Ho,Sim, Doo Sun,Ahn, Youngkeun,Jeong, Myung Ho,Cho, Jeong Gwan,Park, Jong Chun Chonnam National University Medical School 2015 CMJ Vol.51 No.1
<P>An anomalous aortic origin of a coronary artery is rare and surgical intervention is recommended when the patient is symptomatic. We performed coronary artery bypass graft surgery in a 21-year-old male patient with a right coronary artery anomalously originating from the left coronary sinus. The artery was significantly stenosed by external compression between the aorta and the pulmonary artery. However, the graft became occluded 1 year after the operation. In such cases, the dynamic nature of the stenosis can cause relatively intact antegrade competitive flow from the native coronary artery and lead to an occlusion of the grafted artery. Methods for evaluating flow rates or intraluminal pressures of native arteries could be helpful in decision-making in similar cases.</P>
Effectiveness of limited airway ultrasound education for medical students: a pilot study
Seunghun Park,Sanghun Lee,도한호,김재성,서준석 대한응급의학회 2019 Clinical and Experimental Emergency Medicine Vol.6 No.3
Objective The point-of-care ultrasound of the airway (POCUS-A) is a useful examination method but there are currently no educational programs for medical students regarding it. We designed a POCUS-A training curriculum for medical students to improve three cognitive and psychomotor learning domains: knowledge of POCUS-A, image acquisition, and image interpretation. Methods Two hours of training were provided to 52 medical students in their emergency medicine (EM) rotation. Students were evaluated for cognitive and psychomotor skills before and immediately after the training. The validity measures were established with the help of six specialists and eight EM residents. A survey was administered following the curriculum. Results Cognitive skill significantly improved after the training (38.7±12.4 vs. 91.2±7.7) and there was no significant difference between medical students and EM residents in posttest scores (91.2±7.7 vs. 90.8±4.6). The success rate of overall POCUS-A performance was 95.8%. The students were confident to perform POCUS-A on an actual patient and strongly agreed to incorporate POCUS-A training in their medical school curriculum. Conclusion Cognitive and psychomotor skills of POCUS-A among medical students can be improved via a limited curriculum on EM rotation.
Park, Sung Young,Choi, Dong Shin,Jin, Hye Jun,Park, Juhun,Byun, Kyung-Eun,Lee, Ki-Bum,Hong, Seunghun American Chemical Society 2011 ACS NANO Vol.5 No.6
<P>We report a method for selective growth and structural-polarization-controlled neuronal differentiation of human neural stem cells (hNSCs) into neurons using carbon nanotube network patterns. The CNT patterns provide synergistic cues for the differentiation of hNSCs in physiological solution and an optimal nanotopography at the same time with good biocompatibility. We demonstrated a polarization-controlled neuronal differentiation at the level of individual NSCs. This result should provide a stable and versatile platform for controlling the hNSC growth because CNT patterns are known to be stable in time unlike commonly used organic molecular patterns.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2011/ancac3.2011.5.issue-6/nn2006128/production/images/medium/nn-2011-006128_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn2006128'>ACS Electronic Supporting Info</A></P>
Park, Hyun,Ahn, In-Young,Park, Kyung-Il,Hyun, Seunghun Cambridge University Press 2008 Antarctic science Vol.20 No.6
<B>Abstract</B><P>The effects of thermal stress on antioxidant defences in tissues of the Antarctic clam<I>Laternula elliptica</I>were evaluated and the activities of some antioxidant enzymes, and levels of total glutathione (GSH) and protein carbonyl (PC) in digestive gland and gill over 0-4 days under extreme thermal stress (10°C) were measured. Superoxide dismutase activity was slightly higher after one day of thermal stress, although catalase activity was not altered significantly in either digestive gland or gill tissues. Thermal stress was associated with a significant increase in the activity of GSH-related antioxidant enzymes. Glutathione peroxidase and glutathione reductase activities increased up to 1.8- and 2.0-fold, respectively, after two days of thermal stress. Glutathione S-transferase activity drastically increased, to over 3.4- and 4.2-fold in digestive gland and gill, respectively, and remained high on day four. GSH levels also increased in both tissues and remained high on day four. PC content, a marker of protein oxidation, increased after two days of thermal stress. There is evidence that GSH-related antioxidant defence plays a significant role in relation to potential toxicity from reactive oxygen species during thermal stress.</P>
Enhanced Differentiation of Human Neural Stem Cells into Neurons on Graphene
Park, Sung Young,Park, Jaesung,Sim, Sung Hyun,Sung, Moon Gyu,Kim, Kwang S.,Hong, Byung Hee,Hong, Seunghun WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.36
<P><B>Graphene‐substrate‐promoted human neural stem cell adhesion</B> and its differentiation into neurons is reported. Microarray studies were performed to explore plausible explanation for this effect. Further, an electrical stimulation on differentiated cells via graphene electrodes is demonstrated.</P>
Park, Hyomin,Park, Sungeun,Lee, Seunghun,Kang, Yoonmook,Lee, Hae-Seok,Kim, Donghwan American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.10
<P>In this study, the effect of acceleration voltage on emitter properties was investigated. Phosphorus ion was implanted into a silicon substrate at acceleration voltages of 7, 13, and 20 KeV. As the acceleration voltage increased, the amorphous layer thickness increased from 14 to 33 nm. The projected ranges were around 10 to 13 nm, and little change was observed with the acceleration voltage. The as-implanted phosphorus concentrations as well as the junction depth were higher for higher acceleration voltages. As the phosphorus acceleration voltage increased, a larger and rougher area of contrast was observed at the amorphous/crystalline interface. After thermal treatment at 750 degrees C, strains were observed by high-resolution X-ray diffraction for all acceleration conditions. It was observed that a higher acceleration voltage resulted in a higher intensity of rocking curves with more fringes. Sheet resistances decreased rapidly after thermal treatment above 850 degrees C. The sheet resistance decreased with increasing annealing temperature, while at every temperature, the sample at 7 KeV acceleration voltage showed a higher sheet resistance than the samples at 13 and 20 KeV. The mobility increased for temperatures up to 850 degrees C but the carrier concentrations showed little change. Above 850 degrees C, the mobility did not show much change, but the carrier concentration increased. It is considered that the dopant activation was highly affected by the carrier concentration and not by the mobility.</P>