• Journal of the Korean Society of Safety
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• v.36 no.3
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• pp.31-39
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• 2021

In Korea, more than half of work-related fatalities have occurred on construction sites. To reduce such occupational accidents, safety inspection by government agencies is essential in construction sites that present a high risk of serious accidents. To address this issue, this study developed risk prediction models of serious accidents in construction sites using five machine learning methods: support vector machine, random forest, XGBoost, LightGBM, and AutoML. To this end, 15 proactive information (e.g., number of stories and period of construction) that are usually available prior to construction were considered and two over-sampling techniques (SMOTE and ADASYN) were used to address the problem of class-imbalanced data. The results showed that all machine learning methods achieved 0.876~0.941 in the F1-score with the adoption of over-sampling techniques. LightGBM with ADASYN yielded the best prediction performance in both the F1-score (0.941) and the area under the ROC curve (0.941). The prediction models revealed four major features: number of stories, period of construction, excavation depth, and height. The prediction models developed in this study can be useful both for government agencies in prioritizing construction sites for safety inspection and for construction companies in establishing pre-construction preventive measures.

• Ecology and Resilient Infrastructure
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• v.9 no.1
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• pp.59-67
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• 2022

The purpose of this study is to provide essential data necessary to assess ecological flow requirements by understanding habitat conditions for fish species through monitoring an ecological environment in the Korea stream (Dal Stream) and building related database. On-site surveys were conducted for identifying ecological and habitat conditions at the four monitoring sites. Fish sampling was carried out at the selected four sites (St.) during the period ranging from September, 2008 to September, 2009. At the four sampling sites, we measured water surface elevation, depth and velocity at the cross-sections. Optimal Ecological Flowrates (OEFs) were estimated using the Habitat Suitability Index (HSI) established for four fish species Zacco koreanus (St.1), Pungtungia herzi (St.2), Coreoleuciscus splendidus (St.3), and Zacco platypus (St.4) selected as icon species using the Physical HABitat SIMulation system (PHABSIM). Eighteen species (56.3%) including Odontobutis interrupta, Coreoperca herzi and C. splendidus were found endemic out of the 32 species in eight families sampled during this study period. The endangered species was collected Acheilognathus signifier, Pseudopungtungia tenuicorpa and Gobiobotia macrocephala, and this relative abundance was 9.4%. The most frequently found one was Z. platypus (31.3%) followed by C. splendidus (17.6%) and Z. koreanus (15.7%). The estimated IBI values ranged from 27.3 to 34.3 with average being 30.3 out of 50, rendering the site ecologically poor to fair health conditions. For C. splendidus (St.3), the dominant fish species in the stream, the favored habitat conditions were estimated to be 0.3-0.5 m for water depth, 0.4-0.7 m/s for flow velocity and sand-cobbles for substrate size, respectively. An OEFs of 8.5 m³/s was recommended for the representative fish species at the St.3.

• Asian Pacific Journal of Cancer Prevention
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• v.13 no.9
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• pp.4769-4772
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• 2012

Aims: The purpose of the present study was to investigate healthy lifestyle changes during the period before and after breast cancer diagnosis in Taiwan. Materials and Method: Lifestyle changes during the period before and after cancer diagnosis were assessed by convenience sampling with a structured questionnaire for breast cancer survivors. Results: A total of 235 breast cancer survivors completed the healthy lifestyle scale. The mean values before and after breast cancer diagnosis of the participants were 3.27 and 3.73. The final five dimensions for the period before breast cancer diagnosis were: had not experienced stress; had exercised; had maintained sleep quality; had maintained body weight; and had maintained relationships. The final five dimensions for the period after breast cancer diagnosis were: sleep quality; had not experienced stress; relationship; had exercised; and had maintained body weight. A paired-t test was applied to examine the differences before and after cancer diagnosis, revealing that the total average scores of the participants on the healthy lifestyle scale clearly differed statistically (t= -17.20, p<0.01); and the nine dimensions before and after testing also demonstrate a marked statistical difference (p<0.01). Conclusions: These findings are helpful in understanding the healthy lifestyle changes during the period before and after cancer diagnosis among breast cancer survivors. It is expected that these results can offer references of self-care for this group of patients.

• Korean Journal of Environmental Biology
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• v.33 no.2
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• pp.223-229
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• 2015

Pre-monsoon dynamics of zooplankton community were investigated in the downstream of the Gagok stream flowing into the East Sea of Korea. Monthly sampling was carried out to collect zooplankters at five sites in the stream during the period between April and July 2014. Dissolved oxygen contents exceeded $7.0mg\;L^{-1}$ all the time. Water temperature was in a range of 15.7 to $24.9^{\circ}C$ and pH 7.4 to 8.8, respectively. A total of 75 taxa consisted of 36 species of rotifers, 16 species of cladocerans, 16 species of copepods, four kinds of aquatic insects, two kinds of decapods and one nematod was occurred. One species of marine copepod and one cladoceran, and one species of brackish rotifer and one copepod distributed at the station located in the stream mouth. Zooplankton abundance showed to vary from 42 to 4202 individuals $m^{-3}$ due to the explosion of aquatic insects and Alona sp. at site 2 located in the downstream in April. Heavy rainfall during the monsoon period seems to decrease the zooplankton abundance caused by diffusion and drifting to the sea. Species diversity indices were generally high between 1.2~2.3 and were recorded to be high at the downstream throughout the study period. With the zooplankton dynamics, the influence of the input of sea waters into the stream seemed to be confined to some hundred meters of the stream mouth facing the East Sea.

• Journal of Korean Society of Forest Science
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• v.50 no.1
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• pp.5-9
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• 1980

With polyacrylamide gel electrophoresis, peroxidase isoenzyme patterns in the terminal buds of grafted, 20-year-old Pinus elliottii trees were compared between abundant-flowering and poor-flowering trees during the period of female flower bud initiation. A total of nine peroxidase bands were observed in the terminal buds. The total amount of peroxidase enzymes in slash pine buds showed no significant difference between the abundant-flowering and poor-flowering trees. However, the fifth band from the gel front was observed in all the samples of abundant-flowering trees throughout the sampling period (July 8 to September 17), while this band was absent in most of the poor-flowering trees.

• Journal of Environmental Health Sciences
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• v.18 no.2
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• pp.26-38
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• 1992

This study was carried out to investigate phytoplankton distributions and water properties at 6 sampling places in Yongsan lake during the period from Jun. 30 to Nov. 17, 1991.Results obtained were as follows: 1. At sampled sites, BOD value ranges from 1.0~14.0 mg/l except Sangmongtan where it was 14.0 mg/l on Nov. 17. 2. T-N and T-P were generally high and the former was 0.26~1.42 mg/l, the latter 0.010~0.158mg/l. 3. At all sampled places, salinity was in the range of 0.04~0.57% but especially downstream of Yongsan lake was high, 0.39~0.57% on Oct. 27. 4. The phytoplankton identification in this survey period showed Cyanophyceae is 11 genera 14 species, Bacillariophyceae 13 genera 22 species, Chlorophyceae 30 genera 55 species: total 54 genera 91 species. 5. Dominant species were Anacystis aeruginosa, Lyngbya contorta, Anabeana Sp, Melosira granulata, Melosira granulata var. angustissima, Dictyosphaerium pulchellurn and Actinastrurn hantzschii var. fiuviatile during the period from summer to fall. 6. Lyngbya contorta was seemed to adapt to the circumstance of low transparency. 7. Phytoplankton distributions were seemed to be influenced by salinity and thransparency. And so they might appear much fewer in the downstream than the upperstream in Yongsan lake.

• The Journal of Asian Finance, Economics and Business
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• v.7 no.9
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• pp.631-638
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• 2020

The intention of this research is to identify the effect of corporate social responsibility (CSR) disclosure on firm value with profitability as a moderating variable. Data collection is carried out with data documentation that is based on financial reports and sustainability reports. All companies listed on the Indonesia Stock Exchange (IDX) during the 2013-2017 period are considered as the population of this study. Samples were selected using the purposive sampling method. The following are criteria that would be used in this study: 1) publish a sustainability report using the GRI G4 standard as a reference in preparing reports for 2013-2016, 2) publish a complete financial report for the 2014-2017 observation period, 3) not experience a loss during the 2014-2017 period. The total sample of the study was 109 companies. The study uses path analysis assisted with WarpPLS software version 6.0. The results show that the disclosure of corporate social responsibility has a positive and significant effect on firm value, and profitability moderates the effect of corporate social responsibility disclosure on firm value. The implication of the research is that implementing corporate social responsibility is very important to increase firm's value and firm's sustainability in the future.

• Korean Journal of Adult Nursing
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• v.15 no.1
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• pp.78-87
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• 2003

Purpose: The purposes of the study were 1) to examine what relationships exist between PTE(perceived treatments effect) and PPS (perceived physical suffering) as the independent variables and hope as the dependent variable and 2) to examine whether PTE and PPS predict hope in cancer patients in their post-operative period within the Stotland's hope theory. Method: The Visual Analog Scale was used for measuring PTE and PPS and the Kim & Lee's Hope Scale which had acceptable reliability and validity was used for measuring hope. The data was collected from 38 hospitalized cancer patients who were in the post-operative period with a convenient sampling method. Result: There was a significant positive relationship between hope and the PTE in the low PTE group. There was a significant negative relationship between hope and the PPS in the low PPS group. There were no significant relationships between hope and the PTE in the high PTE group, and between hope and the PPS in the high PPS group. And the PTE explained hope with 71.2% of the variance in the low PTE group. Conclusion: PTE in the low PTE group and PPS in the low PPS group were identified as the factors to explain hope.

• Ocean Science Journal
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• v.40 no.3
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• pp.109-117
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• 2005

Daily changes in phytoplankton abundance and species composition were monitored from July to September 2003 (n=47) to understand which factors control the abundance at a station in Jangmok Bay. During the study, the phytoplankton community was mainly composed of small cell diatoms and dinoflagellates, and the dominant genera were Chaetoceros, Nitzschia, Skeletonema and Thalassionema. Phytoplankton abundance varied significantly from $6.40{\times}10^4$ to $1.22{\times}10^7$ cells/l. The initially high level of phytoplankton abundance was dominated by diatoms, but replacement by dinoflagellates started when the NIP ratio decreased to <5.0. On the basis of the N/P and Si/N ratios, the sampling periofd could be divided into two: an inorganic silicate limitation period (ISLP, $14^{th}$ $July-12^{th}$ of August) and an inorganic nitrogen limitation period (INLP, $13^{th}$ of August - the end of the study). Phosphate might not limit the growth of phytoplankton assemblages in the bay during the study period. This study suggests that phytoplankton abundance and species composition might be affected by the concentrations of inorganic nutrients (N and Si), and provides baseline information for further studies on plankton dynamics in Jangmok Bay.

• The Journal of Asian Finance, Economics and Business
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• v.8 no.1
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• pp.217-224
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• 2021

This research seeks to determine what intellectual capital represented by indicators of conceptual skills, human skills, and technical skills plays a role in the development of financial technology. The consideration of fintech is more practical and economical. The concept of fintech is related to the rapid development of global technology by creating various new technologies, especially computer technology. This research uses secondary data; the population of this study is the top management companies in Indonesia during the new normal era. The sample in this research used a purposive sampling method, and the quantitative method. The results of this research indicate that the intellectual capital variable represented by conceptual skills has a significant positive role in the development of financial technology in the new normal era. This research posits that intellectual capital also has a role in the development of financial technology in the new normal. This is because the new normal period represents currently a new challenge in responding to the economic crisis that is resulting from Covid-19 pandemic around the world. Therefore, new concepts, new humanity, and new techniques are needed to develop financial technology, so that they can exist and encourage economic growth in this Covid-19 pandemic era.