• The Journal of the Korean bone and joint tumor society
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• v.10 no.2
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• pp.61-70
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• 2004

Purpose: We studied to decide the operative indication of the metastatic tumor in pelvis according to the oncologic results, the Eastern Cooperative Oncologic Group (ECOG) performance status and complication. Materials and methods: From May 1994 to May 2003, 9 patients who were performed on palliative treatment and 10 paitents on operative treatment due to metastatic tumor of pelvic bone were investigated. On palliative/operative group, the mean age of patients was 57.6/48.0 years old and the ratio of male to female was 5:4/7:3. Primary origins were 3 cases from kidney, 3 from cervix and 2 of lung, 2 of myeloma, 2 of Non-Hodgkin's Lymphoma, and 1 from breast, bladder, testis, prostate, stomach, liver and retroperitoneal leimyosarcoma respectively. The palliative treatment was performed in 5 cases with radiotherapy, 1 with chemotherapy, 2 with combined chemo-radiotherapy and 1 with percutaneous cementation. The operative methods were 1 case of bone cement insertion after curettage, 2 of Girdlestone with internal hemipelvectomy and 7 of reconstruction after wide excision. Reconstructions were done.: 1 case of bone cementation, 5 of autograft prosthesis composite with irradiation or pastuerization and 1 of saddle prosthesis. We have observed the oncologic results, the ECOG performance status and complication. Results: The oncologic results of palliative/operative groups are NED 0/1, AWD 2/6, DOC 1/2 and DOD 6/1. The ECOG performance status was changed from 1.5 into 4.3 in palliative group and from 2.6 into 2.2 in operative group. The complications were 3 cases of the prosthesis failure and 2 of infection. Conclusion: The indication of operation of metastatic pelvic tumor is decided in consideration of the patient's condition, the grade of malignancy in primary tumor and the life expectancy.

• Journal of The Korean Association For Science Education
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• v.41 no.4
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• pp.339-358
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• 2021

This study explores the agency of a student leader, expressed through efforts to distribute power and encourage participation in elementary scientific modeling classes. The study also analyzes the context in which the leader's agency was expressed and the context in which the development of a collective agency was constrained. The participants were 22 fifth-grade students. The leader's agency was analyzed by examining his words and actions. As a result, at the outset of the study, the leader had the most power, performing all the activities as the sole authority in a non-cooperative participation pattern. However, with reflection and help from the researcher, the leader recognized the problem and facilitated the participation of other students. He developed an identity as a teacher and demonstrated the agency. The leader's agentic behaviors can be categorized into three aspects. First, regarding the cognitive aspect, the leader helped other students participate in modeling by sharing his knowledge. Second, regarding the normative aspect, he made rules to give all students an equal voice. Third, regarding the emotional aspect, the leader acknowledged the contribution of the students, increasing their confidence. The leader's agency temporarily helped the group to overcome the student hierarchy, facilitating a cooperative participation pattern. However, the development of a collective agency was constrained. The power of the leader was partially redistributed, and the other students did not position themselves as equal to the leader. To support the leader's agency to develop into a collective agency, it is necessary to redistribute the power of the leader more equally and to change the recognition of students.

• Journal of Chest Surgery
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• v.43 no.6
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• pp.700-704
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• 2010

Background: For staging primary lung cancer, integrated positron emission tomography/computed tomography (PET/CT) imaging is popular. The purpose of this study was to evaluate the accuracy of PET/CT scanning in lymph nodal staging of lung cancer. Material and Method: We studied 48 patients who had received CT, PET/CT and pulmonary resections due to primary non-small cell lung cancer in our hospital between January 2006 and August 2009. Mediastinal lymph nodes were classified as superior mediastinal nodes, aortic nodes, inferior mediastinal nodes, or N1 nodes. We compared the power of CT and PET/CT for diagnosing pulmonary lymph nodes for each of the four types of nodes. Result: PET/CT was more sensitive than CT for all groups except inferior mediastinal nodes. However, the differences were not significant (McNemar's test: superior mediastinal nodes, p=0.109; aortic nodes, p=1.000; inferior mediastinal nodes, p=0.625, N1 nodes, p=0.424). Conclusion: The accuracy of PET/CT is similar to that of CT alone for staging lymph nodes. The two imaging modalities might be used as complementary, cooperative tools. We expect that integrated PET/CT will be found to be significantly mmore sensitive after more trials are done and more data is accumulated.

• Tuberculosis and Respiratory Diseases
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• v.62 no.3
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• pp.217-222
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• 2007

Talc pleurodesis is a safe and effective treatment for a recurrent malignant pleural effusion. However, acute hypoxemia, pulmonary edema or acute respiratory failure can develop in a small number of patients. We report 2 patients who developed fatal hypoxemia after talc pleurodesis which was necessary the control recurrent pleural effusion. The first case was an 18-year old male diagnosed with Ewing's sarcoma with bilateral lung metastases and pleural effusion. The performance status was ECOG (Eastern Cooperative Foncology Group) grade 3. Fever along with hypoxemia and leukocytosis developed 10 hours after the second talc pleurodesis on the right side for an uncontrolled pleural effusion, The patient died from respiratory failure after 13 days. The second case was a 66-year old female diagnosed with non-small cell lung cancer with a bone metastasis. Two weeks after systemic chemotherapy, she complained of dyspnea, and a pleural effusion was observed on the right side. Her performance status was ECOG grade 3. Talc pleurodesis was performed for recurrent pleural effusion, but hypoxemia developed 6 days after pleurodesis and she died from respiratory failure 10 days after pleurodesis. In conclusion, talc pleurodesis should be performed very carefully in patients with a poor performance status, in cases with repeated pleurodesis, bilateral pleural effusion, recent chemotherapy, radiotherapy and when there are parenchymal metastatic lesions present.

• Journal of Distribution Research
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• v.11 no.1
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• pp.41-68
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• 2006

Today, Manufacturing companies execute the logistics outsourcing that commits the non-core logistic function to the specialized logistics corporation, which makes the manufacturing company focus on its core competence, product development and marketing, reduces logistics cost and improves customer service level. Recently, Logistics outsourcing is developed into cooperative sourcing based on the partnership. Case study on the logistics outsourcing will provide the good guideline for planning of the outsourcing strategy. The objective of this research is making a sense about 4PL through the case of UPS-Samsung Electro-Mechanics and catching major issue to provide the guideline for the cooperation outsourcing strategy. We investigated historical backgrounds of the logistics outsourcing between UPS and Samsung Electro-Mechanics. We also investigated problems occurred in outsourcing process at the five dimensions-organizational problem, CEO's short-term views, cultural gap between two companies, integration of IT system, and different understanding about outcomes. We expect to give many implications to manufacturing companies which want to cooperate with specialized logistics corporation.

• Journal of Korean society of Dental Hygiene
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• v.9 no.1
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• pp.169-180
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• 2009

This study grasped recognition on a system of long-term care insurance for the elderly targeting dental professionals who are working at dental hospitals and clinics where are located in Daejeon Metropolitan City. It developed and utilized materials available for educating the care staff in a system of long-term care insurance for the elderly and the dental professionals who participate in the oral hygiene service. It carried out the effective duty performance for the elderly in a situation of long-term care protection. Thus, the purpose of this study was to contribute to the early settlement in a system of long-term care insurance for the elderly. The following conclusions were obtained as a result of having carried out self-administered questionnaire research targeting 238 people from August 1 to August 30 in 2008. 1. In the general characteristics of the research subject, the present working place was indicated to be 22.7% for dental hospital, 71.8% for dental clinic, and 5.5% for others. As for the main duty field, the medical treatment & cooperative duty was indicated to be the highest with 61.8%, and was statistically significant(p=0.000). 2. The necessity for a system of long-term care insurance for the elderly was indicated to be 77.7% for 'necessary' and 1.7% for 'unnecessary,' and was statistically significant(p=0.016). 3. In the item of dividing the service of long-term care insurance for the elderly, the dental hygienists showed higher recognition than non-dental hygienists, and indicated significant difference(p=0.010). 4. As for recognition on a system of long-term care insurance for the elderly in dental professionals who responded as saying of 'knowing name and contents' about a system of long-term care insurance for the elderly, the recognition level was high in recognition of subjects' age(p=0.000), division in services(p=0.012), contents in at-home care service(p=0.000), execution in oral-hygiene service(p=0.004), procedure of using the long-term care insurance for the elderly(p=0.016), item of judging grade of long-term care insurance for the elderly(p=0.013), medical charge by service according to judging grade of long-term care insurance for the elderly(p=0.015), burden of cost for a system of long-term care insurance for the elderly(p=0.011), qualification of care staff(p=0.002), and contents of oral-hygiene service(p=0.027), and showed significant difference. 5. The service of long-term care insurance for the elderly and the oral-hygiene service indicated the statistically significant correlation. Accordingly, all of dental professionals need to make a desperate effort to improve dental professionals' knowledge on a system of long-term care insurance for the elderly enough to be required a system of long-term care insurance for the elderly. The more systematic and standardized professional education and materials are thought to be needed to be developed aiming at the success in oral-hygiene service within a system of long-term care insurance for the elderly, by strengthening professionalism in dentists and dental hygienists.

• The Journal of Engineering Geology
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• v.30 no.3
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• pp.315-325
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• 2020

This study was performed to develop a model to predict landslides and determine the variable importance of landslides susceptibility factors based on the probabilistic prediction of landslides occurring on slopes along the road. Field survey data of 30,615 slopes from 2007 to 2020 in Korea were analyzed to develop a landslide prediction model. Of the total 131 variable factors, 17 topographic factors and 114 geological factors (including 89 bedrocks) were used to predict landslides. Automated machine learning (AutoML) was used to classify landslides and non-landslides. The verification results revealed that the best model, an extremely randomized tree (XRT) with excellent predictive performance, yielded 83.977% of prediction rates on test data. As a result of the analysis to determine the variable importance of the landslide susceptibility factors, it was composed of 10 topographic factors and 9 geological factors, which was presented as a percentage for each factor. This model was evaluated probabilistically and quantitatively for the likelihood of landslide occurrence by deriving the ranking of variable importance using only on-site survey data. It is considered that this model can provide a reliable basis for slope safety assessment through field surveys to decision-makers in the future.

• Journal of Advanced Navigation Technology
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• v.20 no.6
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• pp.595-603
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• 2016

In the Republic of Korea, the LTE-based public safety (PS-LTE) network is being built for the 700 MHz frequency band. However, the same bands are also assigned to the LTE-based high-speed railway (LTE-R) network. Therefore, it is essential to utilize the co-channel interference management schemes for the coexistence of two LTE networks in order to increase the system throughput and to reduce the user outage probability. In this paper, we focus on the downlink (DL) system for the coexistence of PS-LTE and LTE-R networks by considering non radio access network (RAN) sharing and LTE-R RAN sharing by PS-LTE users (UEs) to analyze the UE throughput. Moreover, we also utilize the cooperative communications schemes, such as coordinated multipoint (CoMP) for the coexistence of PS-LTE and LTE-R networks in order to reduce the UE outage probability. We categorize the coexistence of PS-LTE and LTE-R networks into four different scenarios, and evaluate the performance of each scenario by the important performance indexes, such as UE average throughput and UE outage probability.

• Journal of Korea Technology Innovation Society
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• v.15 no.3
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• pp.675-699
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• 2012

Recently innovation cluster has been emphasized as a valid policy measure for innovation. For suggesting a new model of innovation cluster, we conducted literature review for the theories of regional innovation system(RIS) and innovation clusters. As a result, the success factors of innovation cluster were classified into system measures, physical measures, and social(human resources) measures from the perspective of RIS. The case of Gyeonggi province's innovation cluster policy was examined for an empirical analysis. For an in-depth analysis, a survey for the tenant companies in Pangyo technovalley(PTV) was conducted. As a result, it was found that Gyeonggi province's innovation cluster policy is evolving from 'a government-initiated system' to 'the 3rd-generation convergence RIS' and that PTV is closely related to the system measures of 'support for up-to-date management and technology information' and 'support for academic-research-industry cooperative research and technological cooperation,' physical measures of 'strengthening the function of PTV support division' and 'shared research equipment and other infrastructures,' and social measures of 'legal, financial, and administrative support system' and 'public childcare facilities'. Also, technology sector was divided into IT and non-IT for a validity check to find out that there was no significant difference in all factors, except for the public relations factors. This study is expected to provide resources for other related researches.

• Korean Journal of Soil Science and Fertilizer
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• v.43 no.4
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• pp.490-497
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• 2010

A chitinolytic bacterium having a strong antagonistic activity against various pathogens including Phytophtora capsici was isolated from rhizosphere soil, and identified as Lysobacter enzymogenes (named as LE429) based on 16S rRNA gene sequence analysis. This strain produced a number of substances such as chitinase, ${\beta}-1$, 3-glucanase, lipase, protease, gelatinase and an antibiotic compound. This antibiotic compound was purified by diaion HP-20, sephadex LH-20 column chromatography and HPLC. The purified compound was identified as phenylacetic acid by gas chromatography-electron ionization (GC-EI) and gas chromatography-chemical ionization (GC-CI) mass spectrometry. In field experiment, pepper plants were treated by the strain LE429 culture (CB), neem oil solution (NO), combination (CB+NO) or control (CON). Plant height and number of branches, flowers and pods of pepper plant in CB treatment were generally highest, and followed by CB+NO, CON and NO. The fungal pathogens were strongly inhibited, while several insect pests were discovered in CB treatment. Any insect pests were not found, while all fungal pathogens tested were not suppressed in NO treatment. However, in CB+NO treatment, non incidence of fungal pathogens and insect pests were found. The strain LE429 producing secondary metabolites with neem oil should be a potential agent to control fungal diseases and insect pests.