• Title/Summary/Keyword: Area-widening

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A study on the impact of corporate social responsibility on organizational trust and Labor-Management Relations (기업의 사회적 책임 활동이 조직신뢰 및 노사관계에 미치는 영향에 관한 연구)

  • Shin, Dong-Ju;You, Yen-Yoo
    • Journal of Digital Convergence
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    • v.9 no.5
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    • pp.123-140
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    • 2011
  • The purposes of this study are to verify if social responsibility activities of domestic companies and organizations who are widening the area of corporate social responsibility activities make a significant effect on the Labor-Management Relations of the company statistically and suggest political and strategic tasks the company must assume if the corporate social responsibility activities are to make positive and negative effects on organizational trust and Labor-Management Relations by members of the company. The results of the study can be summarized as follows. First, companies make a positive effect partially on the standard of employees' confidence for the organization through the corporate social responsibility activities. Second, corporate social responsibility activities have an effect partially on the Labor-Management Relations which are one of the variables influencing an organization's results. Third, the improvement of employees' organizational trust had a significant effect on Labor-Management Relations. Therefore, the results of this study verified the direct and indirect effects between organizational trust and Labor-Management Relations which are important factors of companies' social responsibility and organizational results which were not treated in the precedent studies.

Actual Vegetation and Vegetation Structure of the Bulyeongsa Valley Area in Uljin-gun(Gyeungbuk) (울진군(경북) 불영사계곡지역의 현존식생 및 식생구조)

  • Kang, Hyun-Mi;Choi, Song-Hyun
    • Korean Journal of Environment and Ecology
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    • v.22 no.1
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    • pp.1-10
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    • 2008
  • The Bulyeongsa Valley in Uljin-gun(Gyeungbuk) has a unique beautiful landscape and plentiful ecosystem, and Pinus densiflora for. erecta is distributed widely. Recently as the widening of national road in Bulyeongsa Valley, comprehensive survey is needed. So to investigate the forest distribution and structure, ninety-nine plots were installed and surveyed. Each plot size is $100m^2$. Important percentage analysis of the summarize results, vegatation of Bulyeung valley is found out that dominant species is Pinus densiflora mainly and Quercus variabilis and Quercus serrata are compatitive relation with Pinus densiflora partially. The analysis results of the actual vegetation and degree of green naturality(DGN) showed that Pinus densiflora community is 47.75%, and DGN 8 is 69.14% in total. From the above results, vegatation of Bulyeungsa valley is found out that dominant species is Pinus densiflora mainly, and Quercus variabilis and Quercus serrata are competitive relation with Pinus densiflora partially.

THE EFFECTS OF THE DEGREE OF SATURATION OF ACIDULATED BUFFER SOLUTIONS IN ENAMEL AND DENTIN REMINERALIZATION AND AFM OBSERVATION OF HYDROXYAPATITE CRYSTALS (유기산 완충용액의 포화도가 법랑질 및 상아질의 재광화에 미치는 영향과 수산화인회석의 AFM 관찰)

  • Park, Jeong-Won;Hur, Buck;Lee, Chan-Young
    • Restorative Dentistry and Endodontics
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    • v.25 no.3
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    • pp.459-473
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    • 2000
  • Dental caries is the most common disease in the maxillofacial area. There are many factors contributing to its development, but complete understanding and prevention is not fully known. Since the structure of the coronal and root portion of the tooth is different, the remineralization and demineralization process is also known to be different. In this study, by using a partially saturated buffer solution, we created artificial enamel and dentin caries and evaluated mineral loss. A remineralization solution with four different degrees of saturation (degree of saturation ; group 1, 0.268, group 2, 0.309, group 3, 0.339, group 4, 0.390, PH 4.3, F-2ppm) was used on a demineralized specimen. The mineral precipitating quantity and depth was evaluated by using microradiography. Using an atomic force microscope (AFM), hydroxyapatite crystals of normal, demineralized, and remineralized enamel and dentin were evaluated. The results were as follows: 1. As the degree of saturation of the remineralizing solution increased, the mineral precipitation in the enamel was increased. In group 4, mineral precipitation was limited near the surface. 2. As the degree of saturation of the remineralizing solution increased, the mineral precipitation in the dentin was decreased and it occurred in a deeper portion. In group 4, however, mineral precipitation occurred on the surface and its quantity increased. 3. There was a statistically significant interaction between enamel and dentin mineral content changes on specimens treated with remineralization and demineralization solution (demineralization r=0.44, remineralization r=0.44, p<0.05). 4. Demineralized hydroxyapatite crystals showed central and peripheral dissolving and widening of intercrystal spaces under the AFM. 5. In dentin remineralization small crystal precipitation occurred between the large crystals. We conclude that by adjusting acidulated buffer solution's degree of saturation, we can control enamel and dentin remineralization. In addition, the AFM is highly useful in evaluating changes in remineralized and demineralized hydroxyapatite crystals.

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A Study of Asset and Risk Assessment for Established of Industrial Security Management System (산업보안 경영시스템 구축을 위한 자산 및 위험평가에 관한 연구)

  • Koh, Joon-Cheol;Kim, Tae-Soo;Joo, Yong-Ma;Kim, Woo-Hyun;Kang, Kyung-Sik
    • Journal of the Korea Safety Management & Science
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    • v.12 no.4
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    • pp.1-11
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    • 2010
  • The purpose of this study is, by recognizing that recently, as crimes using information and various adverse-effect phenomena such as hacking and virus occur frequently with rapid development of information network such as Internet in every field of industry, the range of security is widening to the field of industrial areas for preventing the leaking of industrial technology and protecting that technology as well as information security only limited to IT area, and by establishing common concept about industrial security through education on the industrial security at the point of increasing importance of industrial security, to prepare the base of comprehensive risk management system for protecting company's assets (physical factor, technical factor and managerial factor) safely from the random threats or attacks inside and outside the company through assessment of important assets of the company, evaluation of threats and weak points, and risk assessment by building industrial security management system in order to protect company's information assets and resources which are connected to the existence of the company safely from the threats or attacks from inside or outside the company and to spread stable business activities.

A Study on the Method of Ecological Restoration at the Abandoned Expressways - Focusing on the 192.4k(Incheon) Young-Dong Expressway - (폐고속국도의 생태복원 방안 -영동선 192.4K(인천) 지점을 중심으로-)

  • Cho, Dong-Gil;Choi, Jae-Yong;Jeon, Young-Chul
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.13 no.5
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    • pp.38-50
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    • 2010
  • Expressways are often upgraded by widening the lanes and/or by reshaping the roads to be more linear for faster travel time. However, during the process of improving the route of the expressways, the areas where the old expressways used to be are often unused and abandoned. When these neglected sites are left alone, they often become dump sites causing pollution and impacting the surrounding environment. Therefore, it is important to restore the abandoned expressway sites to its full natural beauty. In this study, the abandoned expressway at the Soksa interchange in Pyungchang county, located in Kangwon province was studied for establishing the model of ecological restoration project. Considering the characteristics of the site, the target flora species was chosen to be Quercus species and the target fauna species as amphibians. After the target species were carefully chosen, each species' habitat requirements were studied in order to figure out the appropriate methods toward habitat restoration specifically for these species. In addition, to determine the most efficient method toward restoration of abandoned expressways, the study utilized the planting hole techniques, the crack techniques, and the colonization techniques. In terms of the spatial organization, public education program is incorporated at the main entrance area and the programs for experimenting, and developing vegetation and habitat restoration techniques are placed in the vicinity. In the master plan-to provide natural ecosystem at the site-ASCON (asphalt concrete) was removed first, then plans for restoration including species' habitat restoration were established. Furthermore, the project included plans for improving water quality polluted through non-point source considering the surrounding nearby road and farm lands. Finally, the study established a planning process that will experimentally apply to the abandoned expressway restoration method. In the future, there will be a continuous monitoring of the methods applied to verify if the restoration methods are effective. Also, new restoration techniques should be available according to a variety of abandoned expressways' characteristics.

Uncertainty Analysis for Dam-Break Floodwave Simulation (댐 붕괴 홍수모의에 대한 불확실도 해석)

  • Lee, Hong-Rae;Han, Geon-Yeon;Jo, Won-Cheol
    • Journal of Korea Water Resources Association
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    • v.31 no.3
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    • pp.337-345
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    • 1998
  • DAMBRK-U model is developed for the evaluation of overtopping risk of dam and levee and for the estimation of uncertainty in floodwave simulation. The original algorithm is revised and expanded to include Monte-Carlo analysis to estimate them. The model is tested by applying to hypothetical channels of widening, uniform and narrowing geometry. Larger variation in discharge and water depth are expected at narrower sections of a river. It is calibrated by applying to the Hantan River, where severe damages from Yunchun dam-break and levee overtopping occurred on July, 1996. Overtopping risk of dam is calculated for various discharge conditions for Yunchun-dam, and that of levee is also calculated by comparing levee height with flood level at Hantan recreation area. Simulation results show that the overflow depth of flood level is 1,266~0.782 m and the overflow risk turns out to be 100%.

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Modified Direct W-incision with Silicone Sheet to Minimize Operation Scar in Reconstruction of Mild to Moderate Symptomatic Medial Orbital Wall Fracture (경중도 안와 내벽 골절의 수술 시 흉터 최소화를 위한 변형된 직접 W-절개법과 실리콘판을 이용한 재건)

  • Jung, Jae A;Gong, Jung Sik;Kim, Yang Woo;Kang, So Ra
    • Archives of Craniofacial Surgery
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    • v.14 no.1
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    • pp.30-35
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    • 2013
  • Background: For reconstruction of the mild to moderate medial orbital wall fractures, various surgical approaches have been used. Prior existing W-shaped incision was a direct local approach through a 3 cm incision on the superior medial orbital area with a titanium mesh implant. In this study, the authors modified W-shaped incision and reconstructed the defect with silastic sheet to improve the result and the postoperative scar. Methods: This study included 20 patients who had mild to moderate size of medial wall defect and therefore relatively suitable for reconstruction with silastic sheets from July, 2009 to December, 2011. A modified W-shaped skin incision approximately 1.2 to 1.5 cm in length was made along the superior medial orbital rim from approximately 1 cm medial to the medial canthus to the lower border of the medial eyebrow. The angles of the limbs of the W ranged from 150 to 160 degrees. Results: By using soft flexible silastic sheet, the authors reduced the incision from 3 to 1.5 cm, and by widening the angle of the W limbs, scars were more effectively hided in the relaxed skin tension line. Scar assessment was done with modified patient and observer scar assessment scale and mean score from patients was 2.08 and mean score from observers was 2.12. Conclusion: Although this method will not be suitable for every case, it can be a consistent method to obtain the surgical goal in treatment of mild to moderate blowout fractures of the medial orbital wall.

Surgical approach for venous malformation in the head and neck

  • Ryu, Jeong Yeop;Eo, Pil Seon;Lee, Joon Seok;Lee, Jeong Woo;Lee, Seok Jong;Lee, Jong Min;Lee, Sang Yub;Huh, Seung;Kim, Ji Yoon;Chung, Ho Yun
    • Archives of Craniofacial Surgery
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    • v.20 no.5
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    • pp.304-309
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    • 2019
  • Background: Treatment for venous malformations of the head and neck includes sclerotherapy, surgical resection, or a combination of both. Surgical resection can remove or reduce the volume of vascular lesions; however, surgery can cause postoperative scarring and potential surgical complications. This study sought to determine the effectiveness of surgery for the treatment of venous malformations of the head and neck. Methods: A retrospective review of the medical records of patients who received surgeries for venous malformations of the head and neck from January 2011 to July 2019 was performed. Using clinical photographs, preoperative and postoperative Doppler ultrasonography, outpatient clinic records, and operation records, the postoperative result and complications were evaluated for each case. Results: Among patients who visited our vascular anomalies clinic, 43 patients (ratio of male to female= 24:19) received surgeries for venous malformations of the head and neck. Twenty-nine patients had undergone surgery only, five patients received sclerotherapy after surgery, and nine patients received surgery after preoperative sclerotherapy. In postoperative evaluations, the result was excellent in 24 patients, good in 18 patients, and poor in one patient. Four patients experienced a recurrence of lesions with lagophthalmos, drooping of the corner of the mouth, partial wound necrosis, and scar widening found in one patient each. Conclusion: Because the head and neck region is the most exposed area in the body, more active implementation of surgical treatments with or without sclerotherapy is essential to reduce the functional and cosmetic impairments associated with venous malformations.

A Study on the Shift to Service Economy and Changes on Labor Productivity in the Service Industry (서비스경제로의 이행과 노동생산성 변화에 대한 국제비교연구)

  • Ha, Bongchan
    • International Area Studies Review
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    • v.16 no.3
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    • pp.119-134
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    • 2012
  • This paper examines the shift to service economy in the developed countries including Korea and analyzes whether Baumol's cost disease hypothesis could explain the labor productivity growth in the developed countries even though the share of service industry is rising rapidly. We have found the following results: First, the shift to service economy is widely observed in the developed countries. Second, the productivity gap between manufacturing and service industry is widening as a result of stagnant productivity growth in service industry. Third, however, the productivity in the whole economy is still growing because of the large productivity differences among the sub-industries in service industry. Fourth, we have found that the productivities of some service industries, such as finance, communication, business service, etc., are almost same or larger than the productivity of manufacturing industry. From this fact it is likely that the productivity of the whole economy could grow in spite of the stagnant productivity growth in service industry.

Computational Analysis of the Effects of Spray Parameters and Piston Shape on Syngas-Diesel Dual-Fuel Engine Combustion Process

  • Ali, Abubaker Ahmed M.M.;Kabbir, Ali;Kim, Changup;Lee, Yonggyu;Oh, Seungmook;Kim, Ki-seong
    • Journal of ILASS-Korea
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    • v.23 no.4
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    • pp.192-204
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    • 2018
  • In this study, a 3D CFD analysis method for the combustion process was established for a low calorific value syngas-diesel dual-fuel engine operating under very lean fuel-air mixture condition. Also, the accuracy of computational analysis was evaluated by comparing the experimental results with the computed ones. To simulate the combustion for the dual-fuel engine, a new dual-fuel chemical kinetics set was used that was constituted by merging two verified chemical kinetic sets: n-heptane (173 species) for diesel and Gri-mech 3.0 (53 species) for syngas. For dual-fuel mode operations, the early stage of combustion was dominated by the fuel burning inside or near the spray plume. After which, the flame propagated into the syngas in the piston bowl and then proceeded toward the syngas in the squish zone. With the baseline injection system and piston shape, a significant amount of unburned syngas was discharged. To solve this problem, effects of the injection parameters and piston shape on combustion characteristics were analyzed by calculation. The change in injection variables toward increasing the spray plume volume or the penetration length were effective to cause fast burning in the vicinity of TDC by widening the spatial distribution of diesel acting as a seed of auto-ignition. As a result, the unburned syngas fraction was reduced. Changing the piston shape with the shallow depth of the piston bowl and 20% squish area ratio had a significant effect on the combustion pattern and lessened the unburned syngas fraction by half.