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민경수,황태익 한국콩연구회 1988 韓國콩硏究會誌 Vol.5 No.1
豆類와 麥類 원형질체 融合 기술을 改善하여 높은 빈도의 細胞雜種을 생산했고 배양초기 細胞壁재생과 ^(14)C-glucose의 結合을 관찰하였다. PEG 30%와 dextran 10%가 가장 높은 융합율을 나타냈으며 7mM Ca^(2+)의 처리효과도 인정되었다. 융합방법은 원심법이 slide glass 법과 micro syringe 법보다 높은 融合體를 생성시켯다. A₂C에 의해서 10%, DMSO에 의해서 8% 정도 融合促進 효과가 있었다. 원형질체를 융합시킬 때 PEG 처리시간은 15분에 95%이상의 융합이 되었고 1시간 이후는 오히려 감소되는 경향을 보였다. 배앙중인 원형질체와 융합 원형질체에서 紬胞壁의 재생이 관찰되었다. ^(14)C-glucose는 원형질체와 融合體에 많은 結合이 이루어졌으며 원형질체는 2∼3일, 융합체는 5일 이후에 最高結合이 이루어졌다.
민경수,김은상,정영섭,정희원,김현집,최길수,한대희 대한신경외과학회 1991 Journal of Korean neurosurgical society Vol.20 No.12
The visual outcome in consecutive. 16 cases of suprasellar meningioma treated during the past 7 years was reivewed. Progressive visual loss, the most frequent initial complaint(93.8%), occurred over a mean of 35.4 months, was often unilateral(6 patients) or bilateral but asymmetrical(6 patients) and was severe in 12 cases. All 16 patients had visual field abnormalities. There were 9 patients with tumors larger than 3㎝ in diameter and 7 patients with tumors less than 3㎝ in diameter. Four patients had tumors limited to the tuberculum sellae. The tumors extended from the tuberculum sellae onto the planum sphenoidale in four patients, into one optic canal in three patients, onto the diaphragm sellae in four patients and onto the medial sphenoid wing in one patient. Three tumors were incompletely resected(one involving the medial sphenoid wing, one involving the diaphragm sellae and one involving the planum sphenoidale). There was one operative death. Overall, 73% of patients had improved vision postoperatively, 27% remained unchanged. Tumor involving the diaphragm sellae was associated with postoperative visual field deterioration. The visual outcome was affected by the severity of preoperative visual loss bt not by the tumor size and duration of visual symptom. After a mean follow-up of 14.5 months. 15 patients are performing normal activities with improved vision.
중두개와에 발생한 뇌의 해면혈관종 : 증례보고 및 문헌고찰 Report of 2 Cases and Review of Literature
민경수,김은상,정희원,한대희 대한신경외과학회 1991 Journal of Korean neurosurgical society Vol.20 No.12
We report two cases of extracerebral cavernous hemangioma in the middle cranial fossa and reviewed other cases from the literature in view of clinical features and management.
의사결정나무를 활용한 온라인 소비자 리뷰 평가에 영향을 주는 핵심 키워드 도출 연구: 별점과 좋아요를 중심으로
민경수,유동희 한국정보시스템학회 2023 情報시스템硏究 Vol.32 No.3
Purpose This study aims to develop classification models using a decision tree algorithm to identify core keywords and rules influencing online consumer review evaluations for the robot vacuum cleaner on Amazon.com. The difference from previous studies is that we analyze core keywords that affect the evaluation results by dividing the subjects that evaluate online consumer reviews into self-evaluation (star ratings) and peer evaluation (helpfulness votes). We investigate whether the core keywords influencing star ratings and helpfulness votes vary across different products and whether there is a similarity in the core keywords related to star ratings or helpfulness votes across all products. Design/methodology/approach We used random under-sampling to balance the dataset. We progressively removed independent variables based on decreasing importance through backwards elimination to evaluate the classification model’s performance. As a result, we identified classification models that best predict star ratings and helpfulness votes for each product’s online consumer reviews. Findings We have identified that the core keywords influencing self-evaluation and peer evaluation vary across different products, and even for the same model or features, the core keywords are not consistent. Therefore, companies’ producers and marketing managers need to analyze the core keywords of each product to highlight the advantages and prepare customized strategies that compensate for the shortcomings.