• Proceedings of the Korean Environmental Health Society Conference
• /
• 2005.11a
• /
• pp.106-109
• /
• 2005

확산형 시료 채취기와 직독식 기기(공정시험법, Nitrogen Oxides Analyzer Model; EC 9841, Ecotech, Australia)에 의한 $NO_2$, 농도를 비교하고, 능동시료채취기(공정시험법)와 확산형포집기에 의한 HCHO(포름알데히드) 농도를 비교하기 위해 서울 ${\cdot}$ 경기 또는 대전, 충남 ${\cdot}$ 북지역에 소재한 11개 시설(종합병원 4곳, 노인 병원 1곳, 보건소 1곳, 복지관 3곳, 보육시설 2곳)을 대상으로 수행하였다. 1. 포름알데히드의능동 포집법(공정시험법)에 의한 시료(n=87)의 평균농도는 $11.44{\pm}11.07ppb$이고, 확산형 시료 채취기 의한 시료(n=40)의 평균농도는 $11.91{\pm}7.37ppb$으로 비슷한 값이 나왔고, 통계적으로 유의하지 않았다(p=0.806). 2. 포름알데히드 능동 포집법에 의한 농도와 확산형 시료 채취기에 의한 농도와의 상관계수 r=0.404(p=0.037)로 나타나 이 두 가지의 방법은 특정시간 포름알데히드 측정에 사용하여도 어느 정도 비교하기에는 적합할 것으로 생각된다. 3. 이산화질소의 노출정도는 직독식 기기(공정시험방법)와 확산형 시료 채취기로 각각 1시간 (오전, 오후 각각 2회), 8시간 측정하였다. 공정시험방법(n=61)에 의한 1시간-시료 평균농도는$44.48{\pm}37.96ppb$이고, 확산형 시료 채취기(n=61)에 의한 1시간-시료 평균농도는 $3.58{\pm}2.07ppb$으로 통계적으로 유의하였다(p=0.000). 직독식 기기(n=61)에 의한 8시간-시료 평균농도는 $34.85{\pm}22.83ppb$이고, 확산형 시료 채취기(n=61)에 의한 8시간-시료 평균농도 $8.32{\pm}4.44ppb$으로 통계적으로도 유의하였다(p=0.000). 4. 이산화질소를 직독식 기기(공정시험방법)와 확산형 시료 채취기로 측정한 1시간-시료 농도의 상관계수 r=0.253(p=0.268)이고 8시간-시료 일 때 상관계수 r=0.367(p=0.102)로 나타나 확산형 시료 채취기를 직독식 기기(공정시험방법) 대체 사용방법으로 이용하기에는 적합하지 않다고 생각된다.

• Journal of Korean Society of Forest Science
• /
• v.55 no.1
• /
• pp.22-29
• /
• 1982

Two ectomycorrhizal fungi, Pisolithus tinctorius and Thelephora terrestris, were introduced form U.S.A. and inoculated to five pine species in Korea to evaluate the reported growth stimulation of host plants after inoculation. These fungi were grown as mycelial inoculum in large quantity and ioculated to the fumigated nursery soil just before seed sowing. At the end of the first growing season. Pisolithus stimulated the height growth of Pinus densiflora. P. thunbergii. P. rigida, and P. rigida x teada by55, 36, 69, and 37%, respectively, compared with control seedlings with no fumigation and no inoculation. When the growth stimulation was expressed with dry weight, Pisolithus increased dry weight of P. densiflora and P. rigida x taeda by 143% and 128%, respectively, over control seedling. Thelephora failed to stimulate growth of inoculated plants. Pinus koraiensis did not respond to the inoculation during the first growing season. It is concluded that artificial inoculation of nursery pine trees with selected mycorrhizal fungi should be seriously considered to improve the quality of planting stocks and to stimulate early plant growth. The potential for use of Pisolithus in reforestation on adverse sited is also discussed.

• Journal of Chest Surgery
• /
• v.34 no.12
• /
• pp.937-943
• /
• 2001

Background: The aims of this study are to determine the predicting factors related with cardiovascular injuries in sternal fractures and to suggest the indication of emergency echocardiography. Material and Method: A retrospective review of the Ewha Womans University Mok-Dong Hospital trauma registry revealed 40 patients, that visited the hospital with a sternal fracture a over 5-year period. We analyzed 4 factors as predicting factors; 1) presence of restraint, 2) presence of associated injuries, 3) presence of a past medical history involving cardiovascular system, and 4) Revised Trauma Score(RTS). We, also, assessed the utility of conventional study methods involving cardiovascular injuries, such as ECG, chest X-ray, and enzyme level. Based on the methods, we inferred an indication for emergency echocardiography in sternal fractures. Result: Statistically significant predicting factors were the presence of a past medical history involving cardiovascular system and abnormal RTS on admission. Usage of emergency echocardiography depended upon the predicting factors and the results from conventional evaluations. We can now suggest the indications of emergency echocardiography in sternal fractures as 1) if more than two studies reveal abnormality without any significant predicting factors, and 2) if more than one study reveals abnormality with any significant predicting factors. Conclusion: The past medical history involving cardiovascular system and initial vital signs imply the presence of cardiovascular injuries in sternal fractures. And if needed, emergency echocardiography should be performed.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.19 no.11
• /
• pp.253-263
• /
• 2018

This paper examined the U-shape curvilinear relationship between team level conflict management and individual level turnover intention by using exit-voice theory, bandwagon effect, and social loafing theory. In addition to the non-linear relationship between team-level conflict management and individual-level turnover intentions, we also examined how trust in leaders has a moderating effect on this relationship. The samples were collected from a South Korean manufacturing company with 331 team members from 48 teams and items were measured twice to avoid common method biases. The intercepts-as-outcomes model of hierarchical linear modelling was conducted to verify the hypothesis. Results supported the cross-level curvilinear hypothesis which indicated that employees' turnover intention sharply decreased if the activeness of group conflict management was small and increases slightly, but this tendency moderated as activeness increases. After passing the lowest point, their turnover intention increased in the end. However, the moderation effect of trust in leader on this relationship was not statistically significant and hypothesis 2 was rejected. This paper explained the effects of group dynamics of conflict management on individual turnover intention. Such evidence may elucidate the importance of managing the social loafing behavior on conflict management process. This paper examined the sequential, multi-level, and curvilinear relationship between conflict management and turnover intention. Organizations and managers will benefit from avoiding the human resource loss by managing the conflict management process.

• Journal of Wetlands Research
• /
• v.24 no.3
• /
• pp.170-184
• /
• 2022

The Riparian Buffer Zone(RBZ) is a sustainable social-ecological system created in the middle zone between water and land. For the RBZ, close communication with the local community is important, and it is necessary to promote it as a communicative environmental planning process. In this study, for the RBZ project, three strategies are presented as a communicative act to understand and implement planning. First, government-led projects were avoided and improved to a process in which citizens and stakeholders participated together, centered on local partnership. Second, it was intended to introduce design criterias in terms of enhancing the function of ecosystem services that citizens can sympathize with, and to increase acceptance and awareness through the planning of preferred spaces and facilities. Third, after a balanced plan for habitats, water cycle-based ecological environment, ecological experience and open space, citizens felt the restoration effect and value as an ecological resources, and a system was prepared to participate in the operation and management. This study will work as a process model based on citizens's participation. In addition, it will be possible to provide lessons for the change of the policy paradigm for the RBZ and the implementation of similar projects in the future.

• Korean Journal of Soil Science and Fertilizer
• /
• v.19 no.2
• /
• pp.157-165
• /
• 1986

This experiment was conducted to find out the some physiological characteristics and nitrogen fixation activities under free-living conditions of indigenous rhizobia isolated from soybean-cultivated (30 fields) and un-cultivated (30 fields) soil. The results were summerized as follows: 1. In free-living condition, only 12.8% and 6.4% of the indigenous rhizobia isolated from soybean cultivated (133 strains) and un-cultivated (125 strains) soils were nitrogenase positive as more than 4 n mole $C_2H_4$ per tube per hour by acetylene reduction assay. 2. The acid-producing rhizobia on litmus milk test was observed to be 20% of the total 160 strains isolated from soybean cultivated soil but about 34% of 166 strains isolated from un-cultivated soil. And the serum zone positive strains were higher in the soybean un-cultivated soil than cultivated soil. 3. The population ratio of fast-to slow-growing indigenous rhizobia based on growth pattern of AMA medium was 35.6% to 64.4% of the total 346 strains. 4. The population of indigenous Rhizobium japonicum counted by MPN method was ranged from $9.2{\times}10^2$ cells per gram of soil in soybean un-cultivated soil to $2.3{\times}10^4$ cells per gram of soil soybean cultivated soil. The number of indigenous R. japonicum in 0-10cm depth of surface layer was higher than low layer.

• Korean Journal of Heritage: History & Science
• /
• v.39
• /
• pp.243-280
• /
• 2006

At the Bujang-ri Site, Seosan, South Chungcheong Province, around 220 archaeological features, including semi-subterranean houses and pits of Bronze Age and semi-subterranean houses, pits, and burials of Baekje period had been identified and investigated. In Particular, mound burials No. 5 of 13 of Baekje mound burials yielding a gilt-bronze cap along with other valuable artifacts drew international scholarly attention. The gilt-bronze cap from the mound burial No. 5 is a significant archaeological data not only in the study of Baekje archaeology but also in the study of international affairs and exchange at that time. At the time of exposure, the gilt-bronze cap was already broken into a number of pieces and seriously damaged by corrosion, and hardening and urethane foam were necessary in the process of collecting its pieces. Ahead of main conservational treatments on cap, X-ray photograph and CT(computerizes tomography) were taken in order to examine interior structure of the cap and to decide appropriate treatments. In the five layers identified in the profile of cap, a textile layer was set between a metal and a layerof bark of paper birch for avoiding direct contact of the metal and the bark of paper birch. Analyses were executed for examining textile layer and a layer of fibroid material. According to microscopic analysis, while the textile layer consisted of the simplest plain fabric with one fold among three kinds of textile structures, the layer of fibroid material was mixed with two or three kinds of fibers. A comparative analysis with standard sample using FT-IR (Fourier Transform Infrared Spectroscopy) announced that both textiles and fabrics were hemp. Analysis of kind of the paper birch resulted in barks of paper birch with 15 fold. A metallographic microscope, SEM, and WDS were used for the analysis of microscopic structures of plated metal pieces. While amalgam plating was treated as a plating method, the thickness of the plated layer, a barometer of plating technique, was ranged from $1.72{\mu}m$ to $8.67{\mu}m$. The degree of purity of gold (Au) used in plating was 98% in average, and less than 1% of silver (Ag) was included.

• KSBB Journal
• /
• v.24 no.4
• /
• pp.403-409
• /
• 2009

H2AX, a crucial component of chromatin, is implicated in DNA repair, cell cycle check point and tumor suppression. The aim of this study was to identify direct binding partners of H2AX to regulate cellular responses to above mechanisms. Literature reviews and bioinformatical tools were attempted intensively to find binding partners of H2AX, which resulted in identifying two potential proteins, breast cancer-1 (BRCA1) and BRCA1-associated RING domain 1 (BARD1). Although it has been reported in vivo that BRCA1 co-localizes with H2AX at the site of DNA damage, their biochemical mechanism for H2AX were however only known that the complex monoubiquitinates histone monomers, including unphosphorylated H2AX in vitro. Therefore, it is important to know whether the complex directly interacts with H2AX, and also which regions of these are specifically mediated for the interaction. Using in vitro GST pull-down assay, we present here that BRCA1 and BARD1 directly bind to H2AX. Moreover, through combinational approaches of domain analysis, fragment clonings and in vitro binding assay, we revealed molecular details of the BRCA1-H2AX and BARD1-H2AX complex. These data provide the potential evidence that each of the BRCA1 nuclear localization signal (NLS) and BARD1 BRCA1 C-terminal (BRCT) repeat domain is the novel mediator of H2AX recognition.

• Progress in Medical Physics
• /
• v.21 no.2
• /
• pp.145-152
• /
• 2010

Inveon PET is a recently developed preclinical PET system for small animal. This study was conducted to measure the performance of Inveon PET as recommended by the NEMA NU 4-2008. We measured the spatial resolution, the sensitivity, the scatter fraction and the NECR using a F-18 source. A 3.432 ns coincidence window was used. A $1\;mm^3$ sized F-18 point source was used for the measurement of spatial resolution within an energy window of 350~625 keV. PET acquisition was performed to obtain the spatial resolution from the center to the 5 cm offset toward the edge of the transverse FOV. Sensitivity, scatter fraction, and NECR were measured within an energy window of 350~750 keV. For measuring the sensitivity, a F-18 line source (length: 12.7 cm) was used with concentric 5 aluminum tubes. For the acquisition of the scatter fraction and the NECR, two NEMA scatter phantoms (rat: 50 mm in diameter, 150 mm in length; mouse: 25 mm in diameter, 70 mm in length) were used and the data for 14 half-lives (25.6 hr) was obtained using the F-18 line source (rat: 316 MBq, mouse: 206 MBq). The spatial resolution of the F-18 point source was 1.53, 1.50 and 2.33 mm in the radial, tangential and axial directions, respectively. The volumetric resolution was $5.43\;mm^3$ in the center. The absolute sensitivity was 6.61%. The peak NECR was 486 kcps @121 MBq (rat phantom), and 1056 kcps @128 MBq (mouse phantom). The values of the scatter fraction were 20.59% and 7.93% in the rat and mouse phantoms, respectively. The performances of the Inveon animal PET scanner were measured in this study. This scanner will be useful for animal imaging.

• Clinical and Experimental Pediatrics
• /
• v.50 no.7
• /
• pp.636-642
• /
• 2007

Purpose : Fluconazole prophylaxis for very low birth weight (VLBW) infants has been shown to reduce invasive fungal infection and its mortality. This study aims to evaluate the effect of fluconazole prophylaxis in VLBW infants on the incidence and mortality of fungal infection. Methods : VLBW infants with endotracheal intubation and central vascular access admitted to the Neonatal Intensive Care Unit (NICU) at Chonnam University Hospital were enrolled. Twenty eight infants of 7-month baseline period from January to July 2005 ('non-fluconazole group') were compared with 29 infants of a 7-month fluconazole period from January to July 2006 ('fluconazole group'). Results : Gestational age, birth weight, sex, mode of delivery, frequency of twin pregnancy, chorioamnionitis, antenatal steroid and rupture of membranes were similar between the fluconazole and non-fluconazole groups. The rate of extremely low birth weight (ELBW) infants, frequency and duration of prophylactic antibiotics, total parenteral nutrition and umbilical catheters, duration of intralipid, mechanical ventilation and nasal continuous positive airway pressure (CPAP) were also not significant. However, frequency of percutaneous central venous catheterization (PCVC) and intralipid administration, and duration of PCVC were significant between the two groups. The overall incidence and mortality of fungal infection were not different between the two groups. Although the Malassezia infection was increased in the fluconazole group (P<0.05), candida was significantly decreased compared to the non-fluconazole group (P<0.05). Conclusion : Fluconazole prophylaxis in high risk VLBW infants decreased the candida infection significantly. Antifungal prophylaxis is recommended in terms of cost effectiveness, but further study is needed to clarify the reason for the increase of Malassezia infection.