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1
상$\cdot$하악 대구치 부위에 식립된 임플란트의 생존율에 대한 후향적 연구

장진화,류경호,정현주,Jang, Jin-Wha,Ryoo, Gyeong-Ho,Chung, Hyun-Ju 대한치주과학회 2007 Journal of Periodontal & Implant Science Vol.37 No.2
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Dental Implants have been proved to be successful prosthetic modality in edentulous patients for 10 years. However, there are few reports on the survival of implant according to location in molar regions. The purpose of this study was to evaluate the $4{\sim}5$ years' cumulative survival rate and the cause of failure of dental implants in different locations for maxillary and mandibular molars. Among the implants placed in molar regions in Gwangju Mir Dental Hospital from Jan. 2001 to Jun. 2002, 473 implants from 166 patients(age range; $26{\sim}75$) were followed and evaluated retrospectively for the causes of failure. We included 417 implants in 126 periodontally compromised patients, 56 implants in 40 periodontal healthy patients, and 205 maxillary and 268 mandibular molar implants. Implant survival rates by various subject factors, surgical factors, fixture factors, and prosthetic factors at each location were compared using Chi-square test and Kaplan-Meier cumulative survival analysis was done for follow-up(FU) periods. The overall failure rate at 5 years was 1O.2%(subject level) and 5.5%(implant level). The overall survival rates of implants during the FU periods were 94.5% with 91.3% in maxillary first molar, 91.1% in maxillary second molar, 99.2% in mandibular first molar and 94,8% in mandibular second molar regions. The survival rates differed significantly between both jaws and among different implant locations(p<0.05), whereas the survival rates of functionally loaded implants were similar in different locations. The survival rates were not different according to gender, age, previous periodontal status, surgery stage, bone graft type, or the prosthetic type. The overall survival rate was low in dental implant of too wide diameter(${\geq}5.75$ mm) and the survival rate was significantly lower for wider implant diameter(p<O.01) in mandibular second molar region, Among 5 surface types(acid etched, SLA, TPS, REM, and HA), the survival rate of SLA type implant was the highest during the FU periods and the failure rates of HA type implants was significantly high following functional loading. Among 26 failed implants, 20 resulted in early failure of osseointegration or infection prior to functional loading, and 6 were removed because of progressive bone loss or implant fracture. In conclusion, implant survival rates were different in different locations on the posterior jaws, and the fixture diameter and surface type were the significant factor for implant survival in mandibular 2nd molar region. This observation suggests that implant treatment planning might require region-specific manner.
2
간호업무 종사자의 불편하고 힘든 작업 위험요인 분석과 개선을 위한 바로(BARAW: By Avoiding Repetitive Motions, Awkward Postures and Weights) 기법 개발 대응

박희석(Hee Sok Park),이경선(Kyung-Sun Lee),민승남(Seung-Nam Min),류장진(Jang Jin Ryoo),진찬호(Chan Ho Jin),박기혁(Ki Hyuk Park) 대한인간공학회 2018 大韓人間工學會誌 Vol.37 No.1
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  ScienceON
  
  DBpia
Objective: To develop a BARAW (By Avoiding Repetitive motions, Awkward postures and Weights) tool which can be applied to assess and improve the musculoskeletal discomfort and pain associated with nursing service workers. Background: Most of existing MSDs assessment tools were developed to investigate the repetitive works commonly found in manufacturing industry. A new approach is needed to assess such non-repetitive works as those done by nurses. Method: As the first step of developing BARAW tools, we investigated the existing assessment tools and guidelines for nurses. And then, BARAW tools were developed based on the results of the expert interview. Based on FGI (Focus group interview) and literature review, a questionnaire was developed to investigate the causes of the musculoskeletal discomfort and pain. Reliability of the questionnaire was tested. Results: The procedure of using the BARAW tool is as follows; 1) finding the cause of discomfort and pain 2) finding possible interventions, 3) implementation of the interventions, 4) evaluation of BARAW’s effectiveness, 5) feedback. Very high reliabilities were obtained from the test. Conclusion: It was shown that BARAW tool developed in this research is a readily applicable to the works of nurses. Application: BARAW tool could be extended to other non-repetitive works.
3
터널건설공사시 발생분진의 입경특성

류장진,장재길,이병규,정시정,김성진,김광종 한국산업위생학회 2003 한국산업보건학회지 Vol.13 No.2
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In tunnel construction work. major dust-generating activities are blasting rock, rock drilling and transport operations. The aim of this study was to find the characterisitic of particle size of dusts which were generated during road tunnel construction work using the New Austrian Tunneling Method(NATM). An 8-stage personal cascade impactor was used for particle size-selective sampling by area sampilng method. Paired samples for total(closed-face 37-mm cassette holder)and respirable(10 mm nylon cyclone) dust were taken to compare with the results of cascade impactor at the same location where cascade impactor samples were taken, The geometric mean of mass median aerodynamic diameter(MMAD) of dust is 3.9(GSD=4.3). This is quite similar to 50% cut size(4.0 ) for respirable mass fraction defined in the ACGIH TLV. The mass fraction of inhalable, thoracic, and respirable particulate defined at ACGIH TLV are 84.0%, 67.2% and 43.1%, respectively. The arithmetic mean ratio of inhalable particulate mass to respirable particulate mass is 2.04 for paired sample, 1.95 for cascade impamtor sample, which showed much lower than those of other construction tasks. We conclude that the dust generated during road tunnel excavation has about 50% respirable fraction in inhalable particulate mass.