• Korean Journal of Environmental Agriculture
• /
• v.25 no.1
• /
• pp.64-70
• /
• 2006

This study was conducted to investigate the concentration of fertigation for optimum yield and soil management of tomato cultivation in soils with different Electrical conductivity (EC) level under PE film house. The EC levels of soil were adjusted to 1.4, 3.0 and 5.4 dS/m and fertigation concentrations were supplied with 0.0 (groundwater), 1.0, 2.0 and 3.0 dS/m, respectively. When the concentration of fertigation was supplied over 3.0 dS/m to soil with EC 1.4 dS/m, the concentrations of $NO_3-N,\;avail.-P_2O_5$, and exchangeable K in soil were increased after the experiment. When fertigation concentration was supplied over 2.0 and 1.0 ds/m to soil with EC 3.0 and 5.4 dS/m respectively, the nutrient were also accumulated in the soil. Thus, the optimum concentrations of fertigation for optimum yield and soil management for tomato cultivation were recommended $1.0{\sim}2.0dS/m$, 1.0 dS/m and ground water (0.0 dS/m) to soils with EC 1.4, 3.0 and 5.4 dS/m, respectively. The fruit weight marketability and marketable yield of tomato were not significant among the treatments at 5% level by LSD. The concentrations of T-N, $P_2O_5\;and\;K_2O$ in tomato leaf were increased with increasing of fertigation concentration whereas the concentrations of CaO and MgO decreased with increasing of fertigation concentration.

• Korean Journal of Agricultural and Forest Meteorology
• /
• v.17 no.4
• /
• pp.326-332
• /
• 2015

Greenhouse-gas emission factors are widely used to estimate emissions arising from a defined unit of a specific activity. Such estimates are used both for international reporting to the United Nations Framework Convention on Climate Change (UNFCCC) and for a myriad of national and subnational reporting purposes. The Intergovernmental Panel on Climate Change (IPCC) provides a methodology for national and sub-national estimation of known greenhouse gas emissions including $N_2O$ for each sector from which the emissions arise. The objective of this study was to develop an emission factor to estimate the direct $N_2O$ emission from an agricultural field cultivated with Chinese cabbage during spring season in 2010-2012. An estimated emission factor of $N_2O$ calculated over three years from field experiment accounting for cumulative $N_2O$ emission, nitrogen fertilization rate, and background $N_2O$ emission was $0.0056{\pm}0.00254$ (95% CI) Kg $N_2O-N/kg$ N. More extensive studies are needed to develop $N_2O$ emission factors for other upland crops in various regions of Korea because $N_2O$ emission is influenced by many factors including climate characteristics, soil properties agricultural practices and crop species.

• The Journal of Information Systems
• /
• v.32 no.2
• /
• pp.1-24
• /
• 2023

Purpose The aim of this study is to investigate how system quality, privacy concerns, and usefulness impact user satisfaction and word-of-mouth intention towards smart order services among Chinese consumers. The study also seeks to provide both theoretical and practical implications based on the findings. Design/methodology/approach This study conducted an empirical study on Chinese consumers through an online survey on 274 users of smart order service in China. To analyze the data, frequency analysis, reliability analysis, and confirmatory factor analysis were performed using SPSS 26.0 and AMOS 26.0 statistical programs, and structural equation model was used for hypothesis testing. Findings The study results are as follows. First, system quality was found to have a positive effect on usefulness and user satisfaction. Second, privacy concerns were found to have a positive effect on user satisfaction, but not on usefulness. Third, user satisfaction was found to have a positive effect on consumers' word-of-mouth intention of the smart order service. Finally, mediating effects were found between system quality and user satisfaction through usefulness, as well as between system quality, perceived privacy concern, and usefulness through user satisfaction.

• The Journal of the Korea Contents Association
• /
• v.16 no.5
• /
• pp.251-258
• /
• 2016

Recently, the demand for fast storage devices is rapidly increasing in cloud platforms, social network services, etc. Despite the development of fast storage devices, the traditional Linux I/O stack is not able to exploit the full extent of the performance improvement since it has been optimized for disk-based storage devices. In this paper, we propose an optimized I/O stack which can fully utilize the I/O bandwidth and latency of fast storage devices. To this end, we design a new I/O interface to replace the current block I/O interface and optimize our I/O interface. Our optimized I/O interface bypasses operations/layers in block I/O subsystems of the current Linux I/O stack to fully exploit fast storage devices. We also optimize the Linux file systems such as ext2 and ext4 to run on our I/O interface. We evaluate our I/O stack with multiple benchmarks and the experimental results show that our I/O stack achieves 1.7 times better throughput compared to traditional Linux I/O stack.

• Research in Community and Public Health Nursing
• /
• v.1 no.1
• /
• pp.88-102
• /
• 1989

This survey was conducted in order to find out the degree of health service activities of Public Health Nurses & variables relevant to their activities. The subjects of this survey were 232 PHN in Health Centers, Inchon & Kyung Gi area. Data were collected by mean of questionairs from 30th, September to 30th, October, 1986. For the analysis, ANOVA was used. The results were as follows; 1. General characteristics of PHN: o An approximately four fifth of the subjects (82.3%) was between 20-39 years. o The average career length of the subjects as PHN was 4 years. o Their educational level was almost Nursing School (22.4%) Junior College of Nursing (53.4%). o The marital status of the subjects was already married (75.4%). 3. The degree of health service activities of PHN; o The total mean of health service activities was 2.147 (S.D: 1.477, range 11-5). o Among the 11 Health Service Categories; Health service planning (2.828) is the highest mean scored category. The lowest mean scored category was the other health services. o Among the specific activity items about the 11 health service categories, the highest scored activities were 'personal counselling & education' in well-baby care (2.504), family planning (2.530), Tb control (2.134), disease control (2.371), 'health history taking & health examination', in prenatal care, 'clinic care', in administrative service, 'record & report', in the other categories. o Almost categories (10), 'Home visiting' was the lowest scored activity. 3. The relevance for the health service activities by several variables were as follows; o The relevance for the health service activities by general characteristics of PHN was not shown significance at age, educational level, marital status, relegion status. o And at work place, & work department was shown high significance.

• Journal of Korean Academy of Nursing Administration
• /
• v.12 no.3
• /
• pp.444-453
• /
• 2006

Purpose: The purpose of the study was to identify critical indicators for the development of efficient patient classification system in a emergency room. Method: This study involved following five steps. Step 1. Selection of the lists direct nursing services in the ER. Step 2. Measurement of the time of direct nursing services from Aug. 31st to Nov. 30th, 2005. Step 3. Classification of the patients according to the nursing care time. Step 4. The determination the critical indicators for different patient classes. Result: Determinate indicators were as follow: 3 items in the first group (vital sign checking, IV route starting, blood sampling), 3 items in the second group (vital sign checking, fluid infusion, blood sampling), 9 items in the third group (I/O checking, $O_{2}$ inhalation, suction, fluid infusion, IV bolus, Central catheter preparation & management, blood sampling, intubation preparation & management, postmortem management), 7 items in the fourth group (EKG monitoring, BP monitoring, $O_{2}$ inhalation, fluid infusion, using the specific drugs, CPR, postmortem management). Conclusion: This study can help future studies which measure nursing services standard time or assigns value to emergency nursing services.

• Korean Journal of Soil Science and Fertilizer
• /
• v.48 no.5
• /
• pp.456-463
• /
• 2015

The objective of this study was to determine the effects of granular type of silicate fertilizer on watermelon growth, yield, and characteristics of soil in the greenhouse. Four different levels of silicate fertilizer, 0(control), 600, 1,200, $1,800kg\;ha^{-1}$ were applied for experiment. The silicate fertilizer was applied as a basal fertilization before transplanting watermelon. Compost and basal fertilizers were applied based on the standard fertilizer recommendation rate with soil testing. All of the recommended $P_2O_5$ and 50% of N and $K_2O$ were applied as a basal fertilization. The N and $K_2O$ as additional fertilization was split-applied twice by fertigation method. Watermelon (Citrullus lanatus Thunb.) cultivar was 'Sam-Bok-KKuol and main stem was from rootstock (bottle gourd: Lagenaria leucantha Standl.) 'Bul-Ro-Jang-Sang'. The watermelon was transplanted on April, 15. Soil chemical properties, such as soil pH, EC, available phosphate and exchangeable K, Mg, and available $SiO_2$ levels increased compared to the control, while EC was similar and the concentrations of soil organic matter decreased. Physical properties of soils, such as soil bulk density and porosity were not different among treatments. The growth characteristics of watermelon, such as stem diameter, fresh and dry weight of watermelon at harvest were thicker and heavier for silicate treatment than the control, while number of node was shorter than the control. Merchantable watermelon increased by 3-5% compared to the control and sugar content was 0.4 to $0.7^{\circ}Brix$ higher than the control. These results suggest that silicate fertilizer application in the greenhouse can improve some chemical properties of soils and watermelon stem diameter and dry weight, which are contributed to watermelon quality and marketable watermelon production.

• The Journal of the Korea Contents Association
• /
• v.15 no.7
• /
• pp.403-413
• /
• 2015

Social media has recently become one of the primary tools for viral marketing as an effective advertising channel, in order to maximize effects of world-of-mouth through social media, it is very important to obtain customer experience-centric differentiated contents in offline. However, viral marketing is still being implemented mainly based on online channels because of the lack of effective services and methods to support social medial marketing in conjunction with offline. On that account, this study proposes O2O(Online to Offline) based social media marketing method allowing customers to connect their personal experience conveniently and easily in offline in which they voluntarily participate. Furthermore, this study aims to verify the effectiveness of the proposed method by analyzing the empirical cases thereof. This study would eventually contribute to the vitalization of social media marketing market by enabling customers to obtain personalized posts as connecting online to offline organically and also by allowing corporations to get an ample amount of useful CRM information for planning marketing strategies.

• Korean Journal of Soil Science and Fertilizer
• /
• v.48 no.5
• /
• pp.436-441
• /
• 2015

The chemical properties of paddy fields in Gyeonggi province were monitored every 4 years from 1999 to 2015 in order to provide basic information for soil fertility management of paddy fields. In 2015, the soil chemical properties of paddy fields were 5.9 in pH, $23g\;kg^{-1}$ in organic matter (OM), and $84mg\;kg^{-1}$ in available phosphate (Avail. $P_2O_5$). Exchangeable (Exch.) potassium (K), calcium (Ca) and magnesium (Mg) were 0.30, 5.1 and $1.3cmol_ckg^{-1}$, respectively, and available silicate (Avail. $SiO_2$) was $129mg\;kg^{-1}$. In the long-term analysis, the contents of Avail. $SiO_2$, Exch. Ca and pH of paddy soils showed increasing tendency. However, Avail. $P_2O_5$ and Exch. K tended to decrease, and there were no significant changes in the contents of OM and Exch. Mg. Paddy soil within appropriate pH range increased from 44% in 1999 to 76% in 2003, 84% in 2007, 63% in 2011, and 80% in 2015. But soil within appropriate range of Exch. Ca tended to decrease, showing 36% in 1999, 42% in 2003, 38% in 2007, 37% in 2011 and 32% in 2015. In case of Avail. $SiO_2$, soil within appropriate range increased from 14% in 1999 to 17% in 2003, 18% in 2007, 16% in 2011, and 31% in 2015. As a result, paddy fields with less in nutrient level need to be more fertilized based on soil analysis. And the application of silicate fertilizer is strongly recommended to those of paddy fields in need. Also soil management such as the cultivation of green manure crop or application of rice straw will be necessary to increase the organic matter content of paddy soil.

• Fire Science and Engineering
• /
• v.29 no.5
• /
• pp.104-109
• /
• 2015

The purpose of this study was to compare the ventilatory volume and airway pressure of a facial mask, endotracheal intubation, King tube, and I-gel devices with an Oxylator EM-100 using a RespiTrainer. The data were obtained from July 20 to 21, 2015. Data were analyzed using SPSS WIN 18.0 software. The ventilatory volume for endotracheal intubation was 537 ml (95% CI 530~545 ml), that for the King tube was 502 ml (95% CI 499~506 ml), that for the I-gel was 88 ml (95% CI 485~491 ml), and that for the facial mask was 499 ml (95% CI 496~503 ml). The airway pressure for endotracheal intubation was $11.34cmH_2O$ (95% CI $11.21{\sim}11.41cmH_2O$), that for the King tube was $10.67cmH_2O$ (95% CI $10.60{\sim}10.75cmH_2O$), that for the I-gel was $10.42cmH_2O$ (95% CI $10.35{\sim}10.67cmH_2O$), and that for the facial mask was $10.61cmH_2O$ (95% CI $10.55{\sim}10.68cmH_2O$). As a result, we were able to identify the appropriate ventilatory volume using the Oxylator EM-100.