• Journal of Korean Neurosurgical Society
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• 제62권5호
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• pp.586-593
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• 2019

Objective : To study risk factors of secondary lumbar discectomy (LD) for recurrent herniated lumbar disc (HLD) and identify methods to lower the rate of recurrence. Methods : Data from 160 patients who underwent primary LD were collected retrospectively. Demographic features, radiologic findings including Pfirrmann disc degeneration, and surgical information were analyzed to compare risks between revision and non-revision patients. Results : The revision rate was 15% (24 patients), and the mean follow-up was 28.3 months. HLD recurrence was not related to any demographic characteristics. Primary and secondary LD were most common at the L4-5 level, but the level of operation was not significantly associated with revision. Primary LD most commonly had a Pfirrmann disc degeneration grade of 3, followed by 4. For recurrent HLD, Pfirrmann grade 4 was most common and was statistically significant (p<0.05). A body mass index (BMI) over 30 was considered obese and was significantly related with HLD revision (p<0.05). Conclusion : Patients with high BMI or severe disc degeneration should be informed of HLD revision.

• 대한지역사회영양학회:학술대회논문집
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• 대한지역사회영양학회 2000년도 추계학술대회:통일한국을 대비한 영양감시체계 개발
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• pp.70-70
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• 2000

• 대한지역사회영양학회:학술대회논문집
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• 대한지역사회영양학회 1999년도 춘계학술대회초록집:노년기의 식사지침과 급식방향
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• pp.122-122
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• 1999

• Journal of Advanced Marine Engineering and Technology
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• 제28권5호
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• pp.773-781
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• 2004

This research was Performed to raise grade efficiency of Sturtevant type air classifier. to treat powder less than $74\mu\textrm{m}$ particle produced at the crushing process of the dry aggregates manufacturing system or concrete wastes recycling system. The experimental conditions were in the ranges. 0.85 to 5.15 $m^3$/s of primary air flow rate. 0.005 to 0.015 $m^3$/s of secondary air flow rate $30^{\circ}$ to $70^{\circ}$ of auxiliary blades angle. respectively. for 1.7~3.3 kg/min of the powder feed rate. It was found that the grade efficiency of the air classifier was increased as the baffle plate was attached at the expansion region. and the optimal operating conditions of the air flow rates and the blade angle were obtained. The fractional recovery curves from the experiments were well agreement with the theoretical one of Molerus model.

• Brain Tumor Research and Treatment
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• 제6권2호
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• pp.97-100
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• 2018

Meningioma is relatively common, benign, and extra-axial tumor accounting for about 20% of primary brain and spinal cord tumors. The World Health Organization (WHO) classified these tumors into Grade I (benign), Grade II (atypical), and Grade III (anaplastic) meningioma. Grade I meningioma which is slowly growing tumor and have some rare subtypes. Among them, metaplastic subtype is defined as a tumor containing focal or widespread mesenchymal components including osseous, cartilaginous, lipomatous, myxoid or xanthomatous tissue, singly or in combinations. We report a rare metaplastic meningioma overspreading nearly whole cerebral convexity from main extra-axial tumor bulk in the parietal lobe.

• 한국초등과학교육학회지:초등과학교육
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• 제17권2호
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• pp.67-77
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• 1998

The result of studying primary science education in Korea the first stage under CHOSUN Government General is as follows and it could be seen that it was managed under considerably different philosophy of education than that of the Ministry of Education, Japan. 1) Weekly 2 hours of 'science' were taught at 3rd and 4th grade of primary school. 2) CHOSUN Government General emphasized 'practicality' in the regulation of primary science education. 3) During the transitional period science text compiled by the office of education was revised and used. 4) First primary science text compiled by CHOSUN Government General was "Science Textbook for Commom School" (1913) and it was filled with sentences stimulating interest of students and at end of each chapter there were exercise problems.

• Journal of Korean Neurosurgical Society
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• 제41권3호
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• pp.186-189
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• 2007

Metastasizing mixed tumors [MMT] of salivary glands are inexplicably metastasize maintaining benign histology. There is no pathologic and flow cytometric analysis criteria to predict the metastasis. MMT is known to metastasize by local implantation, vascular and lymphatic embolization after multiple surgery to local recurrences of primary tumor. However, multiple metastasis including cranium and spine occurred even without surgery to the primary tumor in this case. No pathological evidence of malignancy could be found in both primary and metastatic tumor. MMT is considered as an low grade malignancy based on clinical behavior rather than histologic evidence, such as low mortality rate, long delay of metastasis after primary lesion. Cranial metastasis is also extremely rare and only two cases have been reported. We report this unusual case with a literature review.

• 한국수학교육학회지시리즈C:초등수학교육
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• 제3권2호
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• pp.109-113
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• 1999

To improve the elementary student's ability to classify the data and obtain the information from the data through graphics, it is necessary to use the teaching and learning material which encourage the student to study with interest and is adjacent to the student's environment. In this thesis. several materials to satisfy the condition is proposed together with some remarks to direct the teaching. These materials is recommended to use for the maturity learning and teaching in grade 6.

• Radiation Oncology Journal
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• 제35권2호
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• pp.163-171
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• 2017

Purpose: Although stereotactic ablative body radiotherapy (SABR) is widely used therapeutic technique, predictive factors of radiation pneumonitis (RP) after SABR remain undefined. We aimed to investigate the predictive factors affecting RP in patients with primary or metastatic lung tumors who received SABR. Materials and Methods: From 2012 to 2015, we reviewed 59 patients with 72 primary or metastatic lung tumors treated with SABR, and performed analyses of clinical and dosimetric variables related to symptomatic RP. SABR was delivered as 45-60 Gy in 3-4 fractions, which were over 100 Gy in BED when the ${\alpha}/{\beta}$ value was assumed to be 10. Tumor volume and other various dose volume factors were analyzed using median value as a cutoff value. RP was graded per the Common Terminology Criteria for Adverse Events v4.03. Results: At the median follow-up period of 11 months, symptomatic RP was observed in 13 lesions (12 patients, 18.1%), including grade 2 RP in 11 lesions and grade 3 in 2 lesions. Patients with planning target volume (PTV) of ${\leq}14.35mL$ had significantly lower rates of symptomatic RP when compared to others (8.6% vs. 27%; p = 0.048). Rates of symptomatic RP in patients with internal gross tumor volume (iGTV) >4.21 mL were higher than with ${\leq}4.21mL$ (29.7% vs. 6.1%; p = 0.017). Conclusions: The incidence of symptomatic RP following treatment with SABR was acceptable with grade 2 RP being observed in most patients. iGTV over 4.21 mL and PTV of over 14.35 mL were significant predictive factors related to symptomatic RP.

• 과학교육연구지
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• 제34권1호
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• pp.105-112
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• 2010

본 연구의 목적은 탐구 과제에 대한 사전지식이 초등 과학 영재의 관찰방법과 의문에 미치는 영향을 알아보기 위한 것이다. 이를 위해 '거미와 거미줄' 이라는 과제를 해결하는 과정에서의 학생들의 관찰방법과 의문이 사전지식에 의해 어떻게 영향을 받는지 연구하였다. 사전지식이 상대적으로 높은 집단의 학생들은 사전지식이 낮은 집단에 비해서 관찰의 방법과 양이 높게 나타났다. 그러나 사전지식이 양이 높은 집단이나 낮은 집단 모두 관찰 방법에서는 오감을 이용한 단순 관찰을 주로 하였다. 이는 사전지식의 양이 관찰의 양에는 영향을 미치나 관찰 방법에는 영향을 주지 못하는 것으로 볼 수 있다. 사전지식이 높은 집단에서는 보다 높은 수준의 관찰이 나타났다. 이는 관찰의 수준이 높아지기 위해서는 사전에 충분한 교육이 필요함을 의미한다. 따라서 교사들이 관찰을 이용한 수업을 수행할 경우에 사전에 관련된 지식에 대하여 충분한 수업이 이루어져야 보다 효율적인 관찰이 일어난다고 볼 수 있다.