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RISS 인기검색어
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- 저자 : Jae Jin Jeon (검색결과 2,577 건)
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Jin‑Kyung Jeon,Hyunseon Seo,Jimin Park,Soo Ji Son,Yeong Rim Kim,Eun Shil Kim,Jong Woong Park,Woong‑Gyo Jung,Hojeong Jeon,Yu‑Chan Kim,Hyun‑Kwang Seok,Jae Ho Shin,Myoung‑Ryul Ok 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.4
The excessive initial corrosion rate of Mg is a critical limitation in the clinical application of biodegradable Mg implantsbecause the device loses its fi xation strength before the fractured bone heals. This study suggests a new approach to overcomethis hurdle by accelerating tissue regeneration instead of delaying the implant biodegradation. As angiogenesis is anessential process in early bone regeneration, a Mg implant coated with electrospun nanofi bers containing nitric oxide (NO),which physiologically promotes angiogenesis, is designed. The integrated device enables adjustable amounts of NO to bestored on the NO donor-conjugated nanofi ber coating, stably delivered, and released to the fractured bone tissue near theimplanted sites. An in vitro corrosion test reveals no adverse eff ect of the released NO on the corrosion behavior of the Mgimplant. Simultaneously, the optimal concentration level of NO released from the implant signifi cantly enhances tube networkformation of human umbilical vein endothelial cells without any cytotoxicity problem. This indicates that angiogenesis canbe accelerated by combining NO-releasing nanofi bers with a Mg implant. With its proven feasibility, the proposed approachcould be a novel solution for the initial stability problem of biodegradable Mg implants, leading to successful bone fi xation.
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정신보건관련시설 입원(소)자의 주요 정신장애 유병률 : 전국 20개 시설의 입원(소)자를 대상으로
조성진,조맹제,서동우,함봉진,홍진표,배재남,이준영,이동우,박종익,전홍진,김성주,김용익 大韓神經精神醫學會 2004 신경정신의학 Vol.43 No.6
Objectives : One of the objectives of this study is to estimate the prevalence rates of psychiatric diagnoses in the combined populations of psychiatric hospitals, psychiatric nursing facilities and homeless asylums using the Korean version of the Composite International Diagnostic Interview (K-CIDI), which is a comprehensive and fully standardized interview schedule to assess psychiatric disorders for diagnosis. The Other objective is to compare with previously studied prevalence rates of Psy-chiatric diagnoses using the results of this study. Methods : The study subjects, aged from 181o 64 years, were randomly selected from 64,582 institutionalized population of psychiatric hospitals, Psychiatric nursing facilities and homeless asylums as of 30, June, 2001. Twelve trained interviewers administered the K-CIDI to the selected respondents. A total of 1,875 respondents (male 1,194, female 681) completed the interview. Results : The lifetime and one year prevalences of any diagnosis excluding nicotine dependence · withdrawal, anxiety disorder, eating disorder, somatoform disorder were 88.2% (male 88.1%, female 88.3%), and 65.8% (male 62.7%, female 73.7%), respectively. The lifetime and one year prevalences of schizophrenia and other psychotic disorders were 78.5% (male 75.3%, female 83.7%), and 56.8% (male 51.9%, female 64.8%), respectively. The lifetime and one year prevalences of alcohol use disorder (dependence/abuse) were 26.7% (male 37.9%, female 8.3%), and 8.7% (male 12.8%, female 2.1%), respectively. The lifetime and one year prevalences of mood disorder were 18.1% (male 13.5%, female 25.8%), and 10.4% (male 7.2%,female 16.9%), respectively. The lifetime and one year prevalences of schizophrenia and other psychotic disorders were comparable with the 2001 community survey by 1.19% to 1.32%, and 0.51% to 0.61%, respectively. The lifetime and one year prevalences of schizophrenia were also comparable by 0.16% to 0.28%, and 0.16% to 0.25%, respectively. There were no significant changes of prevalence rates when correction were applied to other psychiatric diagnosis. Conclusion : The results of this study could be used for evaluating the distribution of psychiatric diagnoses in mental health related facilities and for planning mental health policies.
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VS전동기를 대체하기 위한 저가형 VVVF 인버터의 개발
전희종,조성민,윤재식,손진근 崇實大學校 1999 論文集 Vol.29 No.1
VS(Variable Speed)-Motor is speed control method using eddy-current coupling. This method installs eddy-current coupling with constant speed driving Induction Motor and controls rotating speed through a charging change of a excitation current, particularly. VS-Motor is used widely because of simple control and wide speed range. But this method has large losses and low efficiency because of heating as slip drum in low speed region. In cooling, addition of a mechanical devices is difficult and in volume, large space is occupied. Using SCR for control, efficiency of system is low. In case of inverter, though advantage of high efficiency and high performance the price is expensive. Therefore, in this study, we developed low-cost type VVVF(Variable Voltage Variable Frequency) Inverter system for substituting VS-Motor.
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전옥철,김윤준,류범영,최재곤,조병욱,홍진후 조선대학교 생산기술연구소 1999 生産技術硏究 Vol.21 No.1
A series of wholly aromatic polyesters with side chains were synthesized by solution polycondensation from 2,5-dialkoxyterephthaloyl chlorides with the corresponding diol. The polymers showed the schlieren textures which is indicative of a nematic phase above their melting temperature. The inherent viscosities (η_(inh)) measured at 35℃ in phenol/p-chlorophenol/1,1,2,2-tetrachloroethane were 0.56-0.98 dℓ/g. The glass transition temperature (T_(g)) and melting temperature (T_(m)) decreased with increasing the length of the alkoxy side chain. Initial decomposition temperatures in TGA occurred at 338 ~ 363℃ in N₂ gas and thermal stability of polymers decreased with increasing the length of the side chain.
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전병렬,이재복,임성진 慶星大學校 環境問題硏究所 1996 環境硏報 Vol.6 No.1
Handling of waste tire rubber is an environmental problem because the number of automobiles is increasing every year. The reuse of waste tire rubber as adsorption material may be a measure to solve this solid waste problem. The adsorption capacity of waste tire rubber was investigated in this study. Operation factors of adsorption such as temperature, pH, solution concentration, and the adsorption capacity were experimentally evaluated to analyze the applicability of waste tire rubber as adsorption material. The waste tire used in the experiment was obtained from an ordinary passenger vehicle. It was washed, dried and cut into pieces with the diameter of about 0.5 mm. to estimate the adsorption capacity, waste tire pieces were put into an erlenmeyer flask containing the hexavalent chromium solution. The atomic absorption spectrophotometry was conducted with the time interval. During the adsorption test, the sample was stirred at the speed of 30-60 rpm. The results showed that equilibrium adsorption capacity was 335 ㎍ Cr??/g of tire when the operation was in the condition of 20ppm chromium solution at pH 1, the temperature of 30℃, and 2g of tire as adsorption material. The value of pH was the most critical factor in adsorption. The extracted zinc ion was detected. This might come out from ZnO which was used in factory as the vula\canization activator of the rubber. The simulation through the isothermic equation resulted in positive applicability for the adsorption of chromium by shredded waste tire rubber.
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항공기 개념설계를 위한 천음속 영역의 공력특성 예측에 관한 연구
전권수,김상진,이재우,변영환 건국대학교 산업기술연구원 2000 건국기술연구논문지 Vol.25 No.-
During the aircraft conceptual design phase, rapid aerodynamic analyses over various configurations are required. Hence, empirical and analytic techniques play important roles in estimating the aerodynamic characteristics. In this study, the aerodynamic characteristic estimation technique for transonic region based on empirical and analytical is developed. By comparing with the results of the wind tunnel experiment and existing prediction method, it is verified that the present method is accurate and useful.
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전홍진,손재근 한국관광정보학회 2003 觀光情報硏究 Vol.- No.13
The room service department is not merely a part of the food & beverages department but also instrumental in improving the image of the hotel and managing customers compared to the sales department. In addition, the business sphere of the room service department involves more than the simple work of supplying customers in guest rooms or attached business places with food & beverages; it also provides services for special guest floors and mini bars, as well as varied services related to customers. The image of a hotel considerably improves with enhancements in the room service department, i.e., providing additional support for welcoming distinguished guests, installing operating lounges on distinguished guest floors, and managing long-term lodgers. For example, the department has been in charge of cutting fruit or providing wine or other special amenities for guest rooms in accordance with the requests of departments concerned or certain kinds of guest rooms. Given the full scale marketing activities of hotels in targeted markets as a result of the deregulation of the hotel market, the image of the hotel and customer satisfaction significantly affect the hotels profits and successful operation. Effective operation and systematic study are therefore necessary to enable the room service department to implement marketing successfully, keeping in mind the flexible administration of the department. Scientific and reasonable marketing should be executed to maximize the profits of the hotel by securing faithful patrons through total customer satisfaction and meeting customers highly graded, varied, differentiated, and individualized requests. The plan to activate marketing strategies for the room service department is summarized below, which integrates the characteristics and business environment of the department. The commodity strategy deals with the development of various food & beverages and regular change of menu in response to customers preferences. The cost can be also reduced when damage to utensils is minimized. In particular, the survey on and development of Oriental food including Korean is essential. Snacks and pasta should also be added and appropriate drinks for high-class guest rooms developed. On the other hand, the price strategy includes the reasonable and effective management of manpower since labor makes up the bulk of the costs. Prices should be settled after the prices of rival companies are compared and analyzed. Foreign utensils and equipment should be replaced with Korean ones to reduce costs. In addition, the logistics strategy involves the effective use of elevators to provide quick services with prior consultations with the departments concerned. The sales promotion also includes PR for the hotel and its general room services through invitation letters sent to customers. The menu should be set on the table in such a way that it is easily noticed by customers in guest rooms. The sales promotion can also use the PR instruments distributed to customers who order lunch at the Fitness Club or Sauna. Likewise, the process management strategy requires a long-term education program for both regular and contractual employees to develop their credentials and abilities. Such program is necessary in minimizing trial and error in providing services and offering only standardized services. Service policies of the hotel should be drafted and made available to every employee, service manuals developed, and services standardized. The strategy for managing physical evidences involves the active acceptance of customers tastes and trends and improvement of the physical environment of the room service department. In particular, the environment should be improved for the benefit of both the hotel and its customers using the 3R environmental policy (Reduce, Recycle, and Reuse). Finally, the strategy for managing employees includes nurturing and developing their linguistic abilities. Good service can only be provided through fluent,, prudent, and polite language when communicating with customers.
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