• Land and Housing Review
• /
• v.4 no.4
• /
• pp.425-434
• /
• 2013

The Small and Medium Business Administration specified 123 construction materials mandatory to purchase directly and forced the public owners to provide the contractors with materials as required by related law. This study extensively reviewed various characteristics and management factors of the owner-providing materials consumed in the public apartment housing under Direct Buying System(DBS) from the public owner's perspective. Subsequently, the major managed materials were identified, and the proper response plan was developed along the material procurement process. The Procurement Management Load Indices (PMLI) of 43 materials were evaluated according to rating criteria with procurement path, project-specified level, user requirement level, supplier's responsibility, on-site work requirement, additional parts, and inspection standards. The tile and aluminum windows were classified in the group needing high-level procurement efforts to reduce the errors and ensure the efficiency. The accurate quantity estimation method, definite purchase details, management activity definition before and after production, additional quantity for rework, interference coordination were defined as the essential activities for effectively responding to DBS.

• Korean Journal of Fisheries and Aquatic Sciences
• /
• v.30 no.3
• /
• pp.377-387
• /
• 1997

Primary fluorescence characteristics of ten standard solutions of organophosphates, sea water, and water from agricultural land were investigated by fluorescence contour. All the standard solutions of organophosphates has shown characteristics countours. Their emission maxima were shown between 296 nm and 437 nm. According to their numbers of emission maxima on the fluorescence contours, the organophosphates can be categorized in two different groups. Ateric and Diazinon are the first group with two emission maxima. DDVP with other seven standard organophosphates belong to the second group. The second group has two subgroups. One is characterized by the similar emission and excitation maxima, which are 310 nm and 280 nm, respectively. Those are DDVP, Hinosan, Kitazin, Locsion, Meta. The other sub-group shows quite different emission and excitation maxima from the first sub-group. They are Monopho, Thaconyl and Gropho and their emisson maxima were in far longer (437 nm) or shorter wavelength (296 nm). From agricutural samples, one of the investigated organophosphates was detetected by its characteristic retention time $(t_r=12min)$. HPIC-fluorescence data gave an additional parameter for differentiation between two organophosphates which has similar excitation and emission maxima.

• Korean journal of applied entomology
• /
• v.53 no.1
• /
• pp.85-91
• /
• 2014

In this study, we analyzed the phylogenetic characterization of root-knot nematodes (Meloidogyne spp.) in soils from fruits and vegetables greenhouses in Korea. Soil samples were collected from 12 greenhouse fields in which tomato, cucumber, watermelon, and Oriental melon were being cultivated. Meloidogyne spp. were detected in all the soil samples at an average number of $72{\pm}6$ nematodes/300 g of soil to $2,898{\pm}468$ nematodes/300 g of soil. Phylogenetic analysis using polymerase chain reaction-restriction fragment length polymorphism was attempted for the second-stage juveniles (J2) of Meloidogyne spp. collected from the greenhouse soils. Twelve Meloidogyne spp. from the greenhouse soils were classified into two groups by using HinfI digestion of mitochondrial DNA, resulting in 900, 410, 290, and 170 bp fragments (group A) and 900, 700, and 170 bp fragments (group B). Phylogenetic analysis based on mitochondrial DNA sequences (1,483-1,521 bp) showed that nine group A isolates were identified as Meloidogyne incognita (99.73-99.93%) and three group B isolates showed 99.54-99.73% similarity to Meloidogyne arenaria.

• The Korean Journal of Mycology
• /
• v.38 no.1
• /
• pp.34-39
• /
• 2010

We have attempted to verify 30 strains of Hypsizigus marmoreus from various mushroom stocks in Korea using random amplified polymorphic DNA (RAPD) methodology. Chromosomal DNAs of them were extracted and subjected to PCR analyses with 3 random primers. Each PCR produced approximately 30 distinct PCR bands with the size from 200 bp to 3000 bp. A dendrogram was acquired using the unweighted pair-group method with arithmetic average (UPGMA) clustering methodology on the basis of the DNA band pattern. The analysis revealed that 30 strains of H. marmoreus were clustered into two distinct clusters. Cluster 1 contained 3 subgroups while the cluster 2 consisted of rather diverse strains. Interestingly, Hm3-10, a wild strain collected from Deog-Yu mountain, was not included in either clusters, indicative of uniqueness of this strain. We nextly attempted to develop strain-specific DNA markers to verify a specific strain. A unique band in the RAPD gel lane of Hm0-4 was extracted and its sequence was determined. PCR with a primer set from the determined sequence revealed that the primer set gave a 250 bp DNA band only for Hm0-4, indicating that this approach works well for the strain-specific identification of H. marmoreus.

• Journal of Life Science
• /
• v.26 no.7
• /
• pp.772-781
• /
• 2016

Dung beetle (Catharsius molossus, CA) is a well-known group of insects thanks to their exploitation of animal feces, a behavioral trait with a global impact on earth′s ecosystems. This study was conducted to investigate the effect of CA extract on a high-fat diet in SD rats. Male rats were divided into 5 groups. Animals were fed on a high-fat diet for seven weeks before and dung beetle extract for a month during the administration. Weight gain was decreased in ethanol extract from CA group. Administration of CA extract reduced the organ weight of testis and kidney, and adipose tissue weight. Lipid oxidative stress was evaluated measuring malondialdehyde level in liver. There were no significant differences in groups. Protein oxidative stress was evaluated measuring protein carbonyl content in blood. The protein carbonyl in blood was significantly decreased in ethanol and acetone extracted dung beetle groups (p<0.05). Meanwhile, the protein carbonyl in hepatocyte was not significant among the groups. Fibronectin and laminin by using D-HUVEC cell in vitro were measured by ELISA assay. There was significance in CA extract. The level of IL-10, IL-1β, VEGF, eNOS was evaluated by ELISA. There was significance in IL-10 compared to control (p<0.05). SOD and GPx tended to increase by CA extract. Furthermore, CAT was increased significantly by CA extract (p<0.05). After administration of CA extracts the composition of saturated fatty acid in adipose tissue tend to decrease, while unsaturated fatty acid increases. In conclusion, dung beetle had anti-hyperglycemia effects of oxidative stress and antioxidant activity.

• Journal of Dental Rehabilitation and Applied Science
• /
• v.37 no.3
• /
• pp.111-122
• /
• 2021

Purpose: The purpose of this in vitro study was to investigate the flexural strength and translucency of three layers in 5Y-ZP and to assess the effect of additional firings on these properties. Materials and Methods: Sintered zirconia blocks were sectioned according to three layers : incisal, transition, and body. Disc-shaped specimens were fabricated from each layer. The diameter of specimens was 15.0 mm and each thickness of specimens for biaxial flexural strength test and translucency was 1.2 mm and 1.0 mm. The specimens were classified into subgroups according to the number of firing (0, 1, and 3 times; n = 10/subgroup) and the additional firings were performed under 900℃ using a furnace. Biaxial flexural strength and translucency was measured using universal testing machine and uv-vis spectrophotometer. X-ray diffraction (XRD) analysis was used for measurement of the phase identification. One-way ANOVA, Tukey HSD test were performed (α = 0.05). Results: There was no significant difference in flexural strength between the three layers (P > 0.05), while there was significant difference in translucency between different layers (P < 0.05). The flexural strength of incisal and transition layer was decreased by the single additional firing, and the three additional firings significantly decreased the flexural strength of three layers. The translucency of layer was decreased by additional firings except the body layer. The XRD patterns of all groups were similar. Conclusion: Three layers of 5Y-ZP were different only in translucency. Additional firings affected the flexural strength and translucency differently depending on the layers but crystalline phases were not changed.

• Cross-Cultural Studies
• /
• v.44
• /
• pp.239-281
• /
• 2016

This article explores the fate of futurism not only by tracing the entire process from the birth and decline of Russian futurism in the early 20th century and the so-called "Korean futurism" in the early 21st century, but also by delving into how their characteristics were shaped. In the first chapter, we investigate four groups of Russian futurism - Ego-Futurism, Cubo-Futurism, Tsentrifuga, and the Mezzanine of poetry, which were born in the age of utopianism before the Revolution. In the opera Victory Over the Sun, which was the culmination of the Zaum project of Cubo-futurists, we can find the initial shortcomings at the levels of language (Kruchenykh), music (Matyushin) and decoration and costume design (Malevich). In the second chapter, we examine chronologically how the term 'futurism' appeared in Korean literature history. In Korea, the term 'futurism' was born following the naming and classification of critic Kwon Heok-Woong, not by the voluntary manifestation of experimental poets such as Hwang Byong-Seung, thus this specific situation provoked stormy polemics between critics for futurism and critics against futurism in the Korean literary world. These polemics on futurist poetics have led to considerations of the relation of criticism to poetry.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.24 no.7
• /
• pp.967-972
• /
• 2018

The genus Chattonella belonging to the class raphidophyceae, is a harmful algal bloom species. Recently, its occurrence has been increasing and expanding along the Korean coast. Species identification of the genus Chattonella only by morphological observation is difficult due to the lack of rigid cell walls. In this study, the morphological characteristics and genetic affinity of Chattonella sp. isolated from Deungnyang Bay in 2017 were examined. We carried out single-cell isolation from field samples then sequenced three different areas using the single-cell PCR method: 1) parts of ribosomal operon, the large subunit (LSU) of the rDNA, 2) the chloroplast-encoded subunit psaA of Photosystem I, and 3) rbcL encoding the large subunit of the Rubisco gene. The cells were morphologically very similar to the general genus Chattonella ($74.0{\pm}10.1{\mu}m$ in length, $33.1{\pm}3.6{\mu}m$ in width). The three partial gene sequences were insufficient to justify distinction at the species rank. However, they clustered at 99-100 % sequence similarity with C. marina, C. marina var. antiqua and C. marina var. ovata.

• Membrane Journal
• /
• v.31 no.3
• /
• pp.219-227
• /
• 2021

Molecularly imprinted membrane (MIM) is a porous polymer membrane incorporating with the molecular recognizing sites. In this study, the supporting P(AN-co-MA) asymmetric membrane was prepared by nonsolvent induced phase separation (NIPS) method. And then, MIM with lysozyme template sites was prepared using the surface imprinting method on the P(AN-co-MA) asymmetric membrane introducing a photoactive iniferter and then photo-grafting. The P(AN-co-MA) asymmetric membrane was modified with 3-chloropropyltrimethoxysilane and dithiocarbamate as a photoactive iniferter. To prepare a lysozyme imprinted membrane, the modified P(AN-co-MA) membrane was copolymerized with acrylamide as a functional momomer, N,N'-methylene bisacrylamide as a crosslinker and lysozyme as a template in the UV irradiation environment. The lysozyme imprinted MIM was analyzed by using SEM, FT-IR and EDS measurements. Its results confirm that all the P(AN-co-MA) membranes have an asymmetric structure and the iniferter group is successfully introduced on the membrane surface. The process parameters were adjusted to obtain MIM having the excellent lysozyme adsorption. The maximum lysozyme adsorption capacity reaches at 2.7 mg/g, which is 13 times higher than that of the non imprinted membrane (NIM). The permselective membrane filtration experiments of ovalbumin to lysozyme show that the P(AN-co-MA) MIM preferentially bounds a greater amount of lysozyme.

• The Journal of The Korea Institute of Intelligent Transport Systems
• /
• v.20 no.6
• /
• pp.147-161
• /
• 2021

The purpose of this study was to investigate the psychological state and driving safety of drivers driving around the truck platoon driving. Using the driving simulator, the experimental environment was constructed with the situation of changing lanes to the platoon and driving within the platoon. We tried to qualitatively and quantitatively analyze the driver's psychological state and driving safety through simulation driving experiments. As a result, in the case of the older driver group, there were many cases where they judged themselves to be driving safely, even though they were driving dangerously in the actual lane change to the platoon or driving within the platoon. In particular, this group showed that the narrower the distance between vehicles, the greater the misrecognition. The results of this study are expected to be useful in deriving the optimum interval when the interval between platooning of trucks needs to be temporarily extended.