• 한국토양비료학회지
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• 제42권3호
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• pp.160-166
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• 2009

We estimated site productivity for unstocked land based on the relationship between site index (i.e., average height of dominant trees at fixed age) and soil physico-chemical properties of Pinus densiflora stands. Site index relates to a direct method of determining a tree's response to a specific environment such as forest soil and climate conditions. We selected 78 sites in 22 P. densiflora stands of central temperate forest zone, and sampled soils for physicochemical analyzing. And 13 properties of soils were statistically treated by stepwise regression. In the degree of contribution of the variables to site index, the highly effective variables in A horizon were OM, clay content, sand content, available $P_2O_5$, and Exch. $Ca^{{+}{+}}$ inorder, and in B horizon T.N., O.M., Soil pH, cation exchange capacity(C.E.C.), and sand content in order. In both A and B horizon of the soil for P. densiflora stands, the variables commonly contributed to the site index were sand content and OM. These results may be useful to provide not only important criteria for establishment of Pinus densiflora stand sespecially in unstocked land but also aguidance for reforestation.

• 디지털콘텐츠학회 논문지
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• 제18권5호
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• pp.905-910
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• 2017

본 논문에서는 재난안전통신망의 전체 구조가 아닌 재난현장에서 소방대원과 현장 지휘통제실간의 정보교환이 효과적으로 이루어질 수 있도록 재난현장 지역 내의 독립적 네트워크 인프라(무선통신, 영상전송 및 현장상황파악 등) 확보를 위한 현장형 스마트 통합관제시스템을 제안하였다. 제안한 재난환경 스마트 통합 관제시스템은 재난현장에서 현장대원간의 무선통신을 지원하고, 재난현장 영상정보 수집을 위한 드론과의 통신을 지원함으로써 현장 관제시스템에서 재난상황에 대한 전체 주변 영상확보 및 현장대원의 효율적 지휘가 가능하게 된다.

• Asian Journal of Atmospheric Environment
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• 제5권2호
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• pp.134-143
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• 2011

The present study aimed to investigate the diurnal variations in air concentrations and exchange fluxes of ammoniacal nitrogen ($NH_x$: ammonia ($NH_3$) and particulate ammonium) in a subalpine deciduous forest in central Japan during a week in summer. The $NH_3$ concentrations ($0.50\;{\mu}g\;N\;m^{-3}$ on average) showed a clear circadian variation, i.e., high and low in the daytime and nighttime, respectively. The concentration of particulate ammonium in the coarse fractions was extremely low, whereas that for the PM2.5 fraction was relatively high $0.55\;{\mu}g\;N\;m^{-3}$ on average). The main inorganic ion components of PM2.5 at the study site were ammonium and sulfate. The exchange fluxes of $NH_x$ were bidirectional. Both the maximum and minimum values occurred in the daytime, i.e., $0.39\;mg\;N\;m^{-2}\;hr^{-1}$ of downward flux and $0.11\;mg\;N\;m^{-2}\;hr^{-1}$ of upward flux for $NH_3$ and $0.25\;mg\;N\;m^{-2}\;hr^{-1}$ of downward flux and $0.13\;mg\;N\;m^{-2}\;hr^{-1}$ of upward flux for PM2.5 ammonium. The exchange fluxes of $NH_x$ at night could be considered as zero. The mean deposition velocity during the research period was almost zero for both $NH_3$ and PM2.5 ammonium. The atmosphere-forest exchange of $NH_x$ in the forest during the study period was balanced. The remarkably large deposition of $NH_x$ was attributable to meteorological events such as showers the night before that thoroughly washed the forest canopy and subsequent clear skies in the morning, which enhanced convection. The cleaning effect of rainfall and the rapid change in convection in the early morning should be monitored to evaluate and generalize the gas and particle exchange in a forest.

• 한국조경학회지
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• 제26권2호
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• pp.207-218
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• 1998

A site survey in two apartment complexes and a nursery experiment were carried out in this study to provide basic data of the long-pending growth characteristics of major landscaping trees, such as Picea abies, Pinus parviflora, Metasequoia glyptostroboides, Magnolia denudata, Acer buergerianum and Acer palmatum. According to the main results, the survival rates were very low, reflected by the average survival rate of the four species was 95% at the nursery site. And, it was presumed that the site conditions of two apartment complexes for tree growth were very inferior to those of the nursery site, taking into consideration that the increment percents of growth factors of the tree species at the nursery site were relatively higher than those of the apartment complexes. The distribution patterns of the current growth factors of trees showed a normal distribution. The regression equation of breast diameter on diameter at root collar showed especially high predictability. And, it was thought that the most critical limiting environmental factors on tree growth at the apartment complexes were found to be alkaline pH caused by excessive Ca, high percent base saturation, insufficiency of available moisture content, bad drainage due to inferior soil texture, high soil hardness, lack of organic matter and shortage of cation exchange capacity in soil.

• The Korean Journal of Physiology and Pharmacology
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• 제2권3호
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• pp.385-393
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• 1998

Human neutrophil elastase (HNElastase, EC 3.4.21.37), a causative factor of inflammatory diseases, was purified by Ultrogel AcA54 gel filtration and CM-Sephadex ion exchange chromatography. HNElastase was inhibited by phenylbutazone in a concentration dependent manner up to 0.4 mM, but as the concentration increased, the inhibitory effect gradually diminished. Binding of phenylbutazone to the human neutrophil elastase caused strong Raman shifts at 200, 440, and 1194 $cm^{-1}$. The peak at 1194 $cm^{-1}$ might be evidence of the presence $of\;-N=N-{\Phi}$ radical. The core area of the elastase, according to the visual molecular model of human neutrophil elastase, was structurally stable. A deeply situated active center was at the core area surrounded by hydrophobic amino acids. Directly neighboring the active site was one positively charged atom and two atoms carrying a negative charge, which enabled the enzyme and the drug to form a strong interaction. Phenylbutazone may form a binding, similar to a key & lock system to the atoms carrying opposite charges near the active site of the enzyme molecule. Furthermore, the hydrophobicity of the surrounding amino acid near the active site seemed to enhance the binding strength of phenylbutazone. Binding of phenylbutazone near the active site may cause masking of the active site, preventing the substrate from approaching the active site and inhibiting elastase activity.

• 한국의류학회지
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• 제27권1호
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• pp.123-133
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• 2003

The specific objectives of the study were as follows: 1) To investigate the composition system (design, usability and interactivity) of web sites of textile exchange of B to B 2) To examine and valuate contents and marketing (announcement, satisfaction and variety of contents) of web sites of textile exchange of B to B. The data were collected from search engine, portal sites of evaluation, direct contact, interview over the phone with web master of concerned web sites and the result of analytical valuation of web sites. The results of this study were as fellows: 1) The Dongsung trading intended to mainly use their homepage as a inside communication place by intranet network. The Daechang trading was mainly using their homepage as a tool of expansion of their outside export market. The etextiler was selling their web solutions through homepage. The texcom was offering the web place and useful informations to trading companies in Asia. 2) The texcom consisted text with little image to speed up for loading and navigation for usability of users. The Dongsung trading made intranet network for communication and exchange of informations of company inside. The etextiler offered a booking menu to inquiry in homepage. The Daechang trading tried to give good impression from the introduction page at homepage.

• 한국대기환경학회지
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• 제19권3호
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• pp.275-284
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• 2003

The soil -air exchange processes of CH$_4$ were investigated in Hari district of Kang Hwa Island, Korea during the late April 2002. In the course of our field experiments, we measured the concentration, concentration gradients (between two different heights of 1 and 5 m), and the fluxes of CH$_4$ using the surface layer gradient microm-eteorological methods. If the relationships between CH$_4$ fluxes and the relevant environmental parameters are examined, CH$_4$ fluxes were found to be affected most significantly by parameters like wind speed. The results of our study indicate that the study area behaved as a net source of CH$_4$ to the atmosphere with a net daily emission rate of 3.6 mg m￣$^2$ The findings of relatively low exchange rate observed at our study site suggest that the rice paddy area investigated prior to planting period can behave as a moderate source of methane.

• 기본간호학회지
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• 제5권2호
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• pp.313-323
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• 1998

This study was a descriptive research on the level of self-care available to continous ambulatory peritoneal dialysis patients (hereinafter referred to as 'CAPD patient') related to the specific area of infection management. The method employed for the collection of data was a modified instrument of the self-care survey essentially based on Young Sook Choi's instrument. The relevant data was collected from september 1, 1996 to september 30, 1996. The subjects were provided with an open-ended question regarding the reasons behind why they did not seek self-care. The answers provided about self-care compliance were analyzed by SPSS for frequency, percentage, mean, t-test, ANOVA. Reasons for non-compliance were analyzed by content analysis. The results of the study were as follows : 1. The percentage of patients engaging in self-care were according to the following self performed tasks : preparation of dialysis : 30.58 points Dialysate exchange procedures : 49.40 points - Two bag type : 50.50 points - Spike type : 48.80 points - Neo type : 48.90 points Catheter exit site care : 25.13 points More specifically, in relation to the preparation of dialysis as referred to above, those patients engaging in self care was relatively high with respect to the cleaning of the dialysis before use and for the preservation of peritosol. However, in dialysate exchange procedures, data revealed that those patients engaging in self-care are relatively low with respect to putting on a mask during the performance of peritosol exchange. Similary in peritosol exchange procedure and catheter exit care, low levels of self-care performance were found in the area of putting on a mask during the peritosol exchange procedures and catheter line testing procedures, respectively. 2. In general characteristics, there appeared to be no distinction in self-care compliance among CAPD patients. 3. The main reasons for non-compliance were based in the following factor : intellectual, attitude, enviromental surrounding and physical. As a result of the foregoing finding, nurses should provide adequate assistance to promote self-care compliance by CAPD patients by checking the preparation of dialysis, dialysate exchange procedure, and catheter exit site care which recieved low point in this research.

• 한국문헌정보학회지
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• 제34권2호
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• pp.211-232
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• 2000

국가간 자료교환(Exchange)이나 기증에 의존하는 외국정부 간행물의 수집과 검색은 전자정부시대를 맞이하면서 새로운 관리제도가 필요하게 되었다. 그에 대한 대안으로 인터넷상의 외국정부정보에 대한 메타사이트를 만들고, 서브젝트 게이트웨이를 검색모형으로 제시함으로써 외국정보에 관한 정보원개발(Collection Development)과 이용자 서비스로 이용하고자 한다. 우수한 메타사이트를 선정하기 위하여 AltaVista의 anchor 기능과 link 기능을 이용하여 계량적인 평가를 하였으며, 서브젝트 게이트웨이 검색모형으로는 분산 메타데이터베이스의 통합 검색 시스템인 Isaac Network 구조를 제시하였다.

• Journal of Electrochemical Science and Technology
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• 제15권2호
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• pp.207-219
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• 2024

Metal-N-C (MNC) catalysts have been anticipated as promising candidates for oxygen reduction reaction (ORR) to achieve low-cost polymer electrolyte membrane fuel cells. The structure of the M-N_x moiety enabled a high catalytic activity that was not observed in previously reported transition metal nanoparticle-based catalysts. Despite progress in non-precious metal catalysts, the low density of active sites of MNCs, which resulted in lower single-cell performance than Pt/C, needs to be resolved for practical application. This review focused on the recent studies and methodologies aimed to overcome these limitations and develop an inexpensive catalyst with excellent activity and durability in an alkaline environment. It included the possibility of non-precious metals as active materials for ORR catalysts, starting from Co phthalocyanine as ORR catalyst and the development of methodologies (e.g., metal-coordinated N-containing polymers, metal-organic frameworks) to form active sites, M-N_x moieties. Thereafter, the motivation, procedures, and progress of the latest research on the design of catalyst morphology for improved mass transport ability and active site engineering that allowed the promoted ORR kinetics were discussed.