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Search Results: 1 - 10 of 22737 matches for " Sang-Pil Kim "
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Efficient 2-Step Protocol and Its Discriminative Feature Selections in Secure Similar Document Detection
Sang-Pil Kim,Myeong-Sun Gil,Yang-Sae Moon,Hee-Sun Won
Computer Science , 2015,
Abstract: Secure similar document detection (SSDD) identifies similar documents of two parties while each party does not disclose its own sensitive documents to another party. In this paper, we propose an efficient 2-step protocol that exploits a feature selection as the lower-dimensional transformation and presents discriminative feature selections to maximize the performance of the protocol. For this, we first analyze that the existing 1-step protocol causes serious computation and communication overhead for high dimensional document vectors. To alleviate the overhead, we next present the feature selection-based 2-step protocol and formally prove its correctness. The proposed 2-step protocol works as follows: (1) in the filtering step, it uses low dimensional vectors obtained by the feature selection to filter out non-similar documents; (2) in the post-processing step, it identifies similar documents only from the non-filtered documents by using the 1-step protocol. As the feature selection, we first consider the simplest one, random projection (RP), and propose its 2-step solution SSDD-RP. We then present two discriminative feature selections and their solutions: SSDD-LF (local frequency) which selects a few dimensions locally frequent in the current querying vector and SSDD-GF (global frequency) which selects ones globally frequent in the set of all document vectors. We finally propose a hybrid one, SSDD-HF (hybrid frequency), that takes advantage of both SSDD-LF and SSDD-GF. We empirically show that the proposed 2-step protocol outperforms the 1-step protocol by three or four orders of magnitude.
Dynamic Sensor Interrogation Using Wavelength-Swept Laser with a Polygon-Scanner-Based Wavelength Filter
Yong Seok Kwon,Myeong Ock Ko,Mi Sun Jung,Ik Gon Park,Namje Kim,Sang-Pil Han,Han-Cheol Ryu,Kyung Hyun Park,Min Yong Jeon
Sensors , 2013, DOI: 10.3390/s130809669
Abstract: We report a high-speed (~2 kHz) dynamic multiplexed fiber Bragg grating (FBG) sensor interrogation using a wavelength-swept laser (WSL) with a polygon-scanner-based wavelength filter. The scanning frequency of the WSL is 18 kHz, and the 10 dB scanning bandwidth is more than 90 nm around a center wavelength of 1,540 nm. The output from the WSL is coupled into the multiplexed FBG array, which consists of five FBGs. The reflected Bragg wavelengths of the FBGs are 1,532.02 nm, 1,537.84 nm, 1,543.48 nm, 1,547.98 nm, and 1,553.06 nm, respectively. A dynamic periodic strain ranging from 500 Hz to 2 kHz is applied to one of the multiplexed FBGs, which is fixed on the stage of the piezoelectric transducer stack. Good dynamic performance of the FBGs and recording of their fast Fourier transform spectra have been successfully achieved with a measuring speed of 18 kHz. The signal-to-noise ratio and the bandwidth over the whole frequency span are determined to be more than 30 dB and around 10 Hz, respectively. We successfully obtained a real-time measurement of the abrupt change of the periodic strain. The dynamic FBG sensor interrogation system can be read out with a WSL for high-speed and high-sensitivity real-time measurement.
Vegetation of mono-layer landfill cover made of coal bottom ash and soil by compost application  [PDF]
Seul Bi Lee, Sang Yoon Kim, Chan Yu, Soon-Oh Kim, Pil Joo Kim
Journal of Agricultural Chemistry and Environment (JACEN) , 2013, DOI: 10.4236/jacen.2013.23008
Abstract: Monolayer barriers called evapotranspiration (ET) covers were developed as alternative final cover systems in waste landfills but high-quality soil remains a limiting factor in these cover systems. Coal bottom ash was evaluated to be a very good alternative to soil in previous tests and a combination of soil (65% wt.wt-1) and coal bottom ash (35% wt.wt-1) was evaluated to be the most feasible materials for ET cover systems. In our pot test, selected manure compost as soil amendment for the composite ET cover system, which was made of soil and bottom ash at ca. 40 Mg.ha-1 application level was very effective to promote vegetation growth of three plants; namely, garden cosmos (Cosmosbipinnatus), Chinese bushclover (Lespedezacuneata), and leafy lespedeza (Lespedeza cyrtobotrya). To evaluate the effect of compost application on plant growth in an ET vegetative cover system, two couples of lysimeters, packed with soil and a mixture of soil and bottom ash, were installed in a pilot landfill cover system in 2007. Manure composts were applied at the rates of 0 and  40 Mg.ha-11before sowing the five plant species, i.e.indigo-bush (Amorphafruticosa), Japanese mugwort (Artemisia princeps, Arundinella hirta, Lespedezacuneata, and Lespedezacyrtobotrya). Unseeded native plant (green foxtail,Setaria viridis) was dominant in all treatments in the 1st year after installation while the growth of the sown plants significantly improved over the years. Total biomass productivity significantly increased with manure compost application, and more significantly increased in the composite ET cover made of soil and bottom ash treatment compared to the single soil ET cover, mainly due to more improved soil nutrient levels promoting vegetation growth and maintaining the vegetation system. The use of bottom ash as a mixing material in ET cover systems has a strong potential as an alternative to fine-grained soils, and manure compost addition can effectively enhance vegetative propagation in ET cover systems.
Immunolocalization of Ephexin-1 in the Developing Canine Cerebellum  [PDF]
Hyun Sik Park, In Youb Chang, Han Yong Kim, Sang Pil Yoon
Neuroscience & Medicine (NM) , 2014, DOI: 10.4236/nm.2014.51002
Abstract:

Ephexin-1 functions as guanine nucleotide exchange factors for the Rho-type GTPases which have important roles in neuronal development including axon guidance, migration, morphogenesis, and plasticity of neurons. As little is known about ephexin-1 in the cerebellum, we investigated the immunolocalization of ephexin-1 in the developing canine cerebellum. While the cellular maturation was followed by the temporal pattern, the calbindin D-28k and ephexin-1 immunoreactivities gradually increased in developing canine cerebellum. When compared to the calbindin D-28k immunoreactivities, belated ephexin-1 immunolocalization was observed in the Purkinje cells which aligned a single layer during cerebellar development. These results suggest that ephexin-1 might play an important role in the development of the Purkinje cells during the first two postnatal weeks based on its immunolocalization in the present study.

A Study on Release Property through Self Coating in LSR Injection Process  [PDF]
Sang-Gweon Kim, Hyung-Pil Park, Jeong-Won Lee, Yong-Jun Jeon, Baeg-Soon Cha
Advances in Materials Physics and Chemistry (AMPC) , 2015, DOI: 10.4236/ampc.2015.57024
Abstract: This study explores the molding processes by using the Multi-component-injection molding (MCM) method, in which monolithic products are molded by attaching mixed liquid-silicone-rubbers (LSRs) to polybutylene terephthalate (PBT) that has the characteristic of self-binding while burning due to Pt catalysts. It is seen that this method increases the binding force between LSR and PBT. The surfaces coated with Polytetrafluoroethylene (PTFE), Cr, Ni, etc. have excellent peeling with plastic and such surfaces are compared with those treated with hot forging die and micro blasting without coating. When peeling tests are performed at the specified polymerization temperature and molding time after LSR molding on these surfaces of hot working die molds without coating, these surfaces show excellent peeling of molds and LSR products. In particular, they show better peeling after micro blasting than surfaces with Cr and Ni coating as well as surfaces without coating, and the peeling strength also decreases. The results of contact angle and XPS analysis indicate that the LSR binding force is enhanced as an effect of catalysts, though it is not found by SEM. According to the XPS analysis, the structures of the surfaces are close to methyl and vinyl materials that are produced while LSR molding.
Analysis of 809 Facial Bone Fractures in a Pediatric and Adolescent Population
Sang Hun Kim,Soo Hyang Lee,Pil Dong Cho
Archives of Plastic Surgery , 2012, DOI: http://dx.doi.org/10.5999/aps.2012.39.6.606
Abstract: Background Facial fractures are infrequent in children and adolescents and have differentclinical features from those in adults. The low incidence in children and adolescents reflectsthe flexibility and underdevelopment of their facial skeletons, as well as their more protectedenvironments. Only a few reports have reviewed such patients in Korea. The authors performeda retrospective study to analyze the characteristics of facial fractures in the Korean pediatricpopulation.Methods We conducted a retrospective review on a series of 741 patients, aged <18 years,with facial fractures who had been treated at our hospital between 2006 and 2010. Thefollowing parameters were evaluated: age, sex, cause, location and type of fractures, associatedinjuries, treatment and complications.Results A total of 741 consecutive patients met the inclusion criteria. The ratio of boys to girlswas 5.7:1. Facial fractures most commonly occurred in patients between 13 and 15 years ofage (36.3%). The most common causes of injury was violence. The nasal fracture was the mostcommon type of fracture (69%) and the blowout fracture was the second most common (20%).Associated injuries occurred in 156 patients (21%).Conclusions The incidence of pediatric facial fractures caused by violence is high in Korea.Our results show that as age increases, etiological factors and fracture patterns gradually shifttowards those found in adults. This study provides an overview of facial fractures in these agegroups that helps illustrate the trends and characteristics of the fractures and may be helpfulin further evaluation and management.
Chemical ablation of the gallbladder using alcohol in cholecystitis after palliative biliary stenting
Tae Hoon Lee, Sang-Heum Park, Sang Pil Kim, Ji-Young Park, Chang Kyun Lee, Il-Kwun Chung, Hong Soo Kim, Sun-Joo Kim
World Journal of Gastroenterology , 2009,
Abstract: Chemical ablation of the gallbladder is effective in patients at high risk of complications after surgery. Percutaneous gallbladder drainage is an effective treatment for cholecystitis; however, when the drain tube cannot be removed because of recurrent symptoms, retaining it can cause problems. An 82-year-old woman presented with cholecystitis and cholangitis caused by biliary stent occlusion and suspected tumor invasion of the cystic duct. We present successful chemical ablation of the gallbladder using pure alcohol, through a percutaneous gallbladder drainage tube, in a patient who developed intractable cholecystitis with obstruction of the cystic duct after receiving a biliary stent. Our results suggest that chemical ablation therapy is an effective alternative to surgical therapy for intractable cholecystitis.
Identification and characterization of circadian clock genes in a native tobacco, Nicotiana attenuata
Felipe Yon, Pil-Joon Seo, Jae Ryu, Chung-Mo Park, Ian T Baldwin, Sang-Gyu Kim
BMC Plant Biology , 2012, DOI: 10.1186/1471-2229-12-172
Abstract: Protein similarity and transcript accumulation allowed us to isolate orthologous genes of the core circadian clock components, LATE ELONGATED HYPOCOTYL (LHY), TIMING OF CAB EXPRESSION 1/PSEUDO-RESPONSE REGULATOR 1 (TOC1/PRR1), and ZEITLUPE (ZTL). Transcript accumulation of NaLHY peaked at dawn and NaTOC1 peaked at dusk in plants grown under long day conditions. Ectopic expression of NaLHY and NaZTL in Arabidopsis resulted in elongated hypocotyl and late-flowering phenotypes. Protein interactions between NaTOC1 and NaZTL were confirmed by yeast two-hybrid assays. Finally, when NaTOC1 was silenced in N. attenuata, late-flowering phenotypes under long day conditions were clearly observed.We identified three core circadian clock genes in N. attenuata and demonstrated the functional and biochemical conservation of NaLHY, NaTOC1, and NaZTL.The circadian clock, entrained by our planet’s 24?h rotation on its tilted axis, plays crucial roles in the synchronization of the performance of organisms with daily cycles of light and temperature, enabling organisms to regulate activities at the correct time of a day [1]. For instance, the endogenous clock in plants influences various biological processes including leaf movements, hypocotyl growth, floral transition, and abiotic and biotic stress resistance [2-4].The circadian rhythmicity and molecular mechanisms underlying the circadian clock have been investigated in many organisms including Drosophila melanogaster, Neurospora crassa, Synechoccocus elongatus, and mice [5-7]. In general, several interconnected transcription/translation feedback loops participate to establish central clock oscillations [8-10]. In plants, circadian rhythmicity is extensively investigated in a dicotyledonous model plant, Arabidopsis thaliana, and a ‘three-loop model’ has been proposed [11].TIMING OF CAB EXPRESSION 1/PSEUDO-RESPONSE REGULATOR 1 (TOC1/PRR1) and two partially redundant MYB transcription factors, CIRCADIAN CLOCK-ASSOCIATED 1 (CCA1) and LAT
Association of Mannose-Binding Lectin 2 Gene Polymorphisms with Persistent Staphylococcus aureus Bacteremia
Yong Pil Chong, Ki-Ho Park, Eun Sil Kim, Mi-Na Kim, Sung-Han Kim, Sang-Oh Lee, Sang-Ho Choi, Jin-Yong Jeong, Jun Hee Woo, Yang Soo Kim
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0089139
Abstract: Objectives Mannose-binding lectin (MBL) is an important component of innate immunity. Structural and promoter polymorphisms in the MBL2 gene that are responsible for low MBL levels are associated with susceptibility to infectious diseases. The objective of this study was to investigate the association of serum MBL levels and MBL2 polymorphisms with persistent Staphylococcus aureus bacteremia (SAB) in adult Korean patients. Methods We conducted a case-control study nested in a prospective cohort of patients with SAB. The study compared 41 patients with persistent bacteremia (≥7 days) and 46 patients with resolving bacteremia (<3 days). In each subject, we genotyped six single-nucleotide polymorphisms in the promoter region (alleles H/L, X/Y, and P/Q) and exon 1 (alleles A/B, A/C, and A/D) of the MBL2 gene and measured serum MBL concentrations. We also compared MBL2 genotypes between SAB patients and healthy people. Results Patients with persistent bacteremia were significantly more likely to have low/deficient MBL-producing genotypes and resultant low serum MBL levels, than were patients with resolving bacteremia (P = 0.019 and P = 0.012, respectively). Independent risk factors for persistent bacteremia were metastatic infection (adjusted odds ratio [aOR], 34.7; 95% confidence interval [CI], 12.83–196.37; P = 0.003), methicillin resistance (aOR, 4.10; 95% CI, 3.19–29.57; P = 0.025), and low/deficient MBL-producing genotypes (aOR, 7.64; 95% CI, 4.12–63.39; P = 0.003). Such genotypes were significantly more common in patients with persistent bacteremia than in healthy people (OR, 2.09; 95% CI, 1.03–4.26; P = 0.040). Conclusions This is the first demonstration of an association of low MBL levels and MBL2 polymorphisms responsible for low or deficient MBL levels with persistent SAB. A combination of factors, including clinical and microbiological characteristics and host defense factors such as MBL levels, may together contribute to the development of persistent SAB.
Response Analysis on Electrical Pulses under Severe Nuclear Accident Temperature Conditions Using an Abnormal Signal Simulation Analysis Module
Kil-Mo Koo,Jin-Ho Song,Sang-Baik Kim,Kwang-Il Ahn,Won-Pil Baek,Kil-Nam Oh,Gyu-Tae Kim
Science and Technology of Nuclear Installations , 2012, DOI: 10.1155/2012/656590
Abstract: Unlike design basis accidents, some inherent uncertainties of the reliability of instrumentations are expected while subjected to harsh environments (e.g., high temperature and pressure, high humidity, and high radioactivity) occurring in severe nuclear accident conditions. Even under such conditions, an electrical signal should be within its expected range so that some mitigating actions can be taken based on the signal in the control room. For example, an industrial process control standard requires that the normal signal level for pressure, flow, and resistance temperature detector sensors be in the range of 4~20?mA for most instruments. Whereas, in the case that an abnormal signal is expected from an instrument, such a signal should be refined through a signal validation process so that the refined signal could be available in the control room. For some abnormal signals expected under severe accident conditions, to date, diagnostics and response analysis have been evaluated with an equivalent circuit model of real instruments, which is regarded as the best method. The main objective of this paper is to introduce a program designed to implement a diagnostic and response analysis for equivalent circuit modeling. The program links signal analysis tool code to abnormal signal simulation engine code not only as a one body order system, but also as a part of functions of a PC-based ASSA (abnormal signal simulation analysis) module developed to obtain a varying range of the R-C circuit elements in high temperature conditions. As a result, a special function for abnormal pulse signal patterns can be obtained through the program, which in turn makes it possible to analyze the abnormal output pulse signals through a response characteristic of a 4~20?mA circuit model and a range of the elements changing with temperature under an accident condition. 1. Introduction To diagnose a severe nuclear accident, it is essential to determine a plant’s status and to continuously monitor a plant’s responses, expected from the actions taken by operators to mitigate a given accident [1]. In addition, a correct interpretation of a plant’s conditions during such an accident is of significant importance for a successful accident management [2]. According to SECY 89-012, the United State Nuclear Regulatory Commission (U.S. NRC) requires that in a reasonable way instrumentation is identified as one of the key elements in utility accident management plants [3]. Moreover, a review of a plant’s accident management capabilities is regarded as a crucial element in achieving a
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