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편측성 후방연장 국소의치에서 직접유지장치의 설계와 지대치 골흡수에 따른 간접유지장치 지대치 주위조직에 발생하는 응력분석
이석현,이청희,조광헌,Lee, Suk-Hyun,Lee, Cheong-Hee,Jo, Kwang-Hun 대한치과보철학회 1998 대한치과보철학회지 Vol.36 No.1
For the purpose of evaluating the effect of both direct retainer design and bony absorption degree around abutment of indirect retainer on the supporting tissue of abutment of indirect retainer, dislodging force was transmitted to unilateral distal extension RPD bases. Analysis of stress distributed within the supporting tissue around abutment of indirect retainer was carried out. Using three-dimensional photoelastic stress analysis method and the conclusion is a follows. 1. According to the extent of force which the direct retainer of the most distal abutment tooth, the amount of force transmitted to the abutment tooth of indirect retainer was small. 2. Of all the cases, Mandibular first premolar which was used abutment tooth of indirect retainer, buccal, mesial and distal sides represented compression stress and lingual side represented tensile stress. 3. The more bone resorption of abutment tooth of indirect retainer, the more distortion of buccal and distal side of abutment tooth was existed and the extent of compression stress which was existed and distal side to abutment tooth was large. 4. When the alveolar bone around the abutment with indircet retainer is normal. The amount of force transmitted on abutment with indirect retainer was small in the order of Akers clasp, RPA clasp, RPI clasp. 5. When the alveolar bone around the abutment with indirect retainer has been absorbed 20% and 30%, the amount of force transmitted on abutment with indirect retainer was small in the order of RPA calsp, RPI clasp, Akers clasp. 6. When denture is displaced, shape of the direct retainer reciprocating abutment affect much the function of indirect retainer.
COVID-19 발생 전후 청량리종합시장 일대 전통시장들에서 나타난 영향
이석현(Lee, Seok-Hyun),이은결(Lee, Eun-Gyeol),유석연(Yoo, Suk-Yeon) 한국도시설계학회 2024 도시설계 : 한국도시설계학회지 Vol.25 No.2
본 연구의 목적은 청량리종합시장 일대 전통시장들에 대한 COVID-19 전후의 영향을 도출하는것이다. 이를 위해 국내에서 첫 확진자가 발생한 2020년 1월을 기준으로, 2018년부터 2022년까지의 기간에 대해 생활인구, 매출 등의 데이터를 분석했고, 텍스트마이닝 분석을 통해 영향을 확인하며 전통시장 이용자의 행태 변화를 도출했다. 연구의 결과는 아래와 같다. 첫째, COVID-19 이후 시장 전체의 생활인구는 감소했으나, 개별 시장 중에서는 종합 식자재 취급 시장의 생활인구 감소가 적은 것으로 나타났다. 둘째, 단위점포별 매출은 전문 특화시장에서 COVID-19 이후 증가했고, 업종별 매출은 소매업에 비해 외식업에서 더 많이 하락했고 식문화 관련어의 순위가 텍스트마이닝분석에서 하락한 것으로 나타나 전통시장에서 외식업이 감염병의 영향을 크게 받았다는 점을 입증했다. 셋째, COVID-19 이후 포장이 용이한 음식 구매와 개방된 외식공간에 대한 수요가 증가했고, 폐쇄적 실내 음식점과 대형쇼핑매장에서 감염병의 영향을 크게 받은 것으로 나타났다. 넷째, 개방적 실외에서 식자재를 취급하는 전통시장의 중요도가 증가했고 소비 관련어의 순위가 상승한 것으로 나타나 앞선 분석에서 생활인구 및 매출 감소폭이 적게 나타난 결과를 입증했다. 본 연구는 미래 재발가능한 팬데믹 사태에 특화산물을 취급하고 저렴한 가격으로 종합구매가 가능하며 개방된 외부공간으로 구성된 전통시장이 영향을 덜 받는다는 시사점을 제시할 수 있다. The purpose of this study is to derive the impact before and after COVID-19 on traditional markets in the Cheongnyangni General Market area. To this end, for the period from 2018 to 2022 based on January 2020, when the first confirmed case occurred in Korea, data such as de facto population and sales were analyzed, and the behavior change of traditional market users was examined through text mining analysis. The findings are as follows: First, after COVID-19, the de facto population of the entire market decreased, but it was found that there was a smaller decrease in the de facto population in the comprehensive food ingredients market among individual markets. Second, sales by unit store increased after COVID-19 in specialized markets, and sales by industry fell more in the restaurant industry than in the retail industry, and the ranking of food culture-related words decreased in text mining analysis, showing that the restaurant industry in traditional markets was greatly affected by the infectious disease. Third, after COVID-19, demand for food that can be easily packaged and open dining spaces have increased, and closed indoor restaurants and large shopping stores have been found to be greatly affected by the infectious disease. Fourth, the importance of open outdoor traditional markets handling food ingredients increased and the ranking of consumption-related words in those markets increased, confirming the results of the previous analysis showing a small decrease in de facto population and sales. This study can suggest that traditional markets, which handle specialized products, enable comprehensive purchases at low prices, and are composed of open outdoor spaces, are less affected by virus pandemics that may recur in the future.