• Smart Structures and Systems
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• 제21권3호
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• pp.257-262
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• 2018

Vibrational problems in the domestic Small Horizontal Axis Wind Turbines (SHAWT) are due to flap wise vibrations caused by varying wind velocities acting perpendicular to its blade surface. It has been reported that monitoring the structural health of the turbine blades requires special attention as they are key elements of a wind power generation, and account for 15-20% of the total turbine cost. If this vibration problem is taken care, the SHAWT can be made as commercial success. In this work, Shape Memory Alloy (SMA) wires made of Nitinol (Ni-Ti) alloys are embedded into the Glass Fibre Reinforced Polymer (GFRP) wind turbine blade in order to reduce the flapwise vibrations. Experimental study of Nitinol (Ni-Ti) wire characteristics has been done and relationship between different parameters like current, displacement, time and temperature has been established. When the wind turbine blades are subjected to varying wind velocity, flapwise vibration occurs which has to be controlled continuously, otherwise the blade will be damaged due to the resonance. Therefore, in order to control these flapwise vibrations actively, a non-linear current controller unit was developed and fabricated, which provides actuation force required for active vibration control in smart blade. Experimental analysis was performed on conventional GFRP and smart blade, depicted a 20% increase in natural frequency and 20% reduction in amplitude of vibration. With addition of active vibration control unit, the smart blade showed 61% reduction in amplitude of vibration.

• 한국병원경영학회지
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• 제4권2호
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• pp.106-130
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• 1999

The main objective of this paper is to perform an empirical analysis on the relationship between various marketing activities and financial performance of Korean hospitals. A survey was conducted through structured questionnaire for 495 hospitals, and data from 218 hospitals were utilized in the final anaylsis.(response rate: 44%) Survey items include general characteristics of the hospitals(size, type, location), degree of competition, financial performance. marketing organization! budget, and level of various marketing activities in service development, access improvement, promotion, and pricing. We examine descriptive statistics of the response scores on marketing activities to evaluate the current status of marketing management of Korean hospitals, compare the results across hospital size, type and location, and perform regression analysis to investigate the relaionship between marketing and financial performance. Major findings are as follows: 1) About 46% of the responding hospitals have marketing departments although they are named as 'planning' or 'PR' departments, and the marketing budget on average represents 1.74% of the total expenditures. 2) Average level of marketing activities is calculated to be about 3.32 on 5-point scale, meaning that Korean hospitals implement their marketing programs 'somewhat actively'; however, the scores on the areas of marketing plannning and strategy are relatively low. 3) Large hospitals tend to be more active in marketing than small hospitals, and public hospitals' activities in marketing are not lower compared to private hospitals. 4) Level of overall marketing activities is positively related with financial performance measured by various finacial indicators except for profitability, implying that marketing is successful in revenue generation but needs to be more cost-effective. Also, when the marketing variables are separately included in the regression, no significant relationship is found, which means that various marketing activities are more effective when they are collectively implemented.

• 한국병원경영학회지
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• 제4권2호
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• pp.41-59
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• 1999

Objectives: This study was done to compare patient satisfaction and hospital charges of surgery performed in an outpatient basis(ambulatory surgical procedures). Methods : This retrospective study was performed in 20(vitrectomy 11, tonsillectomy 9) randomly selected ambulatory surgical procedures patients and 50(vitrectomy 26, tonsillectomy 24) inpatients who. received the same procedure at a general hospital in Seoul since January 1, 1998 to October 31, 1998. The operative procedures were vitrectomy and tonsilletomy which could be performed on a ambulatory surgical procedures basis or on an inpatient basis. Results: The results of this study shows that the patients thought the expenses and the surgical operative time was an important factor in a ambulatory surgical procedures but there were no differences in the patient satisfaction by the method of surgery. The charges of vitrectomy and tonsilletomy were reduced up to 495,000 won and 380,000 won from l,589,000 won 842,000 won inpatient surgery respectively. Conclusions: This study focused only on the charges of the surgical procedures and did not include the cost of patient helper, the lost salary due to missing days of work to care for a member of the family, transportation costs, and other indirect costs. Therefore, if those fees were included, ambulatory surgical procedures would be more economical. Therefore, by giving incentives at the fee schedule, the government health policies it would reduce the total hospital charges.

• 한국정보통신학회논문지
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• 제14권8호
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• pp.1836-1842
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• 2010

센서네트워크는 유비쿼터스 환경을 실현할 수 있는 기술로서, 최근 무인 경비 시스템이나 에너지 관리, 환경 모니터링, 홈 자동화, 헬스케어와 같은 다양한 분야에 적용 가능하다. 하지만 센서네트워크의 무선 통신 특성은 도청과 전송 메시지에 대한 위변조, 서비스 거부 공격에 취약하다. 현재 센서네트워크 상에는 안전한 통신을 위해 ECC(elliptic curve cryptography)를 통한 PKC(public key cryptography)암호화 기법이 사용된다. 해당 기법은 RSA에 비해 작은 키길이를 통해 동일한 암호화 강도를 제공하기 때문에 제한된 성능을 가진 센서상의 적용에 적합하다. 하지만 ECC에 요구되어지는 높은 부하 때문에 센서상의 구현을 위해서는 성능개선이 필요하다. 본 논문에서는 센서 상에서의 ECC를 가속화하기 위해 ECC연산의 핵심연산인 곱셈에 대한 최적화 기법을 제안한다.

• 기술혁신연구
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• 제7권1호
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• pp.36-59
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• 1999

Fundamental advances in the biotechnologies are exerting a profound influence on the health care, agricultural, industrial chemical, environmental, and other industrial fields. Korean government are now more and more realizing the importance of biotechnology as a main technology for the 21st century. But any technical progress is largely the result of a complex set of relationships among the firms, institutions and others involved in development. So understanding the complexity is very important to make promoting strategies and it is even critical in the field of biotechnology. The reason is that commercialization of research results in biotechnology is strongly related with the national science bases provided by academic and public institutes. And its applicable industrial sectors are very diverse. So it is very important to make a effective collaboration system among many R&D related agents. This article discusses and compares both USA and Japanese framework of national innovation systems in the field of biotechnology. The American Innovation system encourages basic research in the biological sciences, and fosters the creation of small venture firms that focus on the development of novel products. America's peculiar incentive structure, derived from its research and educational system, financial system, and regulatory environment has driven USA labs and firms to the forefront of many biotechnology fields. The Japanese institutional environment in contrast, supported the strategy of building production expertise. Firms were urged to use the new techniques as a way of leapfrogging into a second generation of bio-products, in that cost and production advantages count. But the strategy was not effective as expected and Japanese firms have remained competent but not prominent rivals. The differing situations in USA and Japan with regard to biotechnology have many suggestions for our bioindustry. In the conclusion of this article, we translate USA and Japan's experiences to some suggestions which guide for promoting Korea's biotechnology R&D and commercialization activities.

• The Korean journal of internal medicine
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• 제33권6호
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• pp.1160-1168
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• 2018

Background/Aims: The Republic of Korea is a country where the hemodialysis population is growing rapidly. It is believed that the numbers of treatments related to vascular access-related complications are also increasing. This study investigated the current status of treatment and medical expenses for vascular access in Korean patients on hemodialysis. Methods: This was a descriptive observational study. We inspected the insurance claims of patients with chronic kidney disease who underwent hemodialysis between January 2008 and December 2016. We calculated descriptive statistics of the frequencies and medical expenses of procedures for vascular access. Results: The national medical expenses for access-related treatment were 7.12 billion KRW (equivalent to 6.36 million USD) in 2008, and these expenses increased to 42.12 billion KRW (equivalent to 37.67 million USD) in 2016. The population of hemodialysis patients, the annual frequency of access-related procedures, and the total medical cost for access-related procedures increased by 1.6-, 2.6-, and 5.9-fold, respectively, over the past 9 years. The frequency and costs of access care increased as the number of patients on hemodialysis increased. The increase in vascular access-related costs has largely been driven by increased numbers of percutaneous angioplasty. Conclusions: The increasing proportion of medical costs for percutaneous angioplasty represents a challenge in the management of end-stage renal disease in Korea. It is essential to identify the clinical and physiological aspects as well as anatomical abnormalities before planning angioplasty. A timely surgical correction could be a viable option to control the rapid growth of access-related medical expenses.

• 대한예방한의학회지
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• 제23권2호
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• pp.25-42
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• 2019

Objectives : The purpose of this study was to identify factors that affect the utilization of Korean medicine (KM) among children with cerebral palsy (CP) and explore a processing model of decision-making by their parents. Methods : We conducted an individual in-depth interview with 21 mothers of children with CP who were recruited during the observational study. A grounded theory of Strauss and Corbin was used for qualitative analysis. Thus, collected data were classified into open coding including 121 concepts, 27 sub-categories and 7 categories. Results : The central phenomenon of the process of using KM for children with CP is 'KM as an optional treatment not essential'. Therefore there are many obstacles to starting KM treatment and it is easily interrupted for various reasons, unlike general rehabilitation treatment. However, if the patient experiences the therapeutic effect, the parents want to continue KM treatment. They try to provide treatment as much as possible if they can afford it. The parents give priority to general rehabilitation treatment and value the information and experience provided by the caregivers in similar situation as well as expert opinions. Conclusions : To expand and generalize KM treatment for children with CP, efforts to change interventional conditions such as treatment effect, treatment cost, treatment compliance, and convenience of treatment based on the understanding of the strategy used by the parents in KM utilization.

• 한국인터넷방송통신학회논문지
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• 제19권1호
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• pp.187-195
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• 2019

최근 빅데이터 관련 기술들이 발전함에 따라 다양한 분야에서 생성되는 데이터들을 수집하여 저장하고 처리 및 분석할 수 있게 되었다. 이러한 빅데이터 기술들을 임상 결과 분석에 활용하고, 임상시험 설계 최적화를 통해 보건의료분야에 투입되는 막대한 비용을 절감할 수 있을 것으로 전망된다. 따라서 본 논문에서는 임상 결과를 분석하여 임상시험 기간과 비용 등을 줄일 수 있는 가이드 정보를 제시하고자 한다. 먼저 Sqoop을 사용하여 임상 결과 데이터가 저장된 관계형 데이터 베이스로부터 HDFS에 수집하여 저장하고, 하둡을 기반으로 동작하는 처리 도구인 Hive를 이용하여 데이터를 처리한다. 공공분야, 기업 등 각 분야에서 많이 활용되고 있는 빅데이터 분석 도구인 R을 이용하여 연관성 분석을 한다.

• Design & Manufacturing
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• 제14권4호
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• pp.17-24
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• 2020

Products for heating indoors in low temperature and dry winter are largely divided into products using fossil fuels and products using electricity. The fossil fuels can warm the entire space by convection, but there is a high risk of fire and the frequent ventilation due to the increase in carbon monoxide and carbon dioxide. Heaters using electricity are mainly used because they are convenient to use and are cheap. However, these products can not efficiently warm the air because they use radiation energy. In other words, only the front part exposed to the heater is warm, and the rear part has no heating effect at all. Also, because it emits a large amount of light, fatigue of the eyes is very high. Another problem is that when using electric heaters, the room tends to be dry by high heat. Indoor humidity maintenance is a very important factor in the prevention and treatment of respiratory diseases. Especially, it is essential for health care for infants, bronchial organs and people with weak respiratory because humidity is low in winter. In this study, we conducted a study to develop a product that can improve heating efficiency while maintaining proper indoor humidity by combining heat energy and moisture particles. The concept of humidification and heating at the same time, moisture particles generated in the humidifier pass through the heater, include thermal energy, and the moisture particles with thermal energy are diffused into the space by forced convection, thereby warming the entire space. In addition, the heating time is shortened as the feeling temperature is increased with the high relative humidity, and this has the effect that the heating cost in winter is reduced.

• 한국산업정보학회논문지
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• 제14권2호
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• pp.32-50
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• 2009

의료 정보화는 정보기술 발전과 사회환경의 변화와 더불어 양질의 진료와 고객관리 및 경영효율화의 필요성으로 1990년부터 처방전달시스템(OCS)을 도입하면서부터 시작되었다. 의료계의 정보화는 빠른 속도로 발전하고 있으며, 원격진료 시스템 도입과 각종 U-Health Care 관련 제품 및 의료 서비스 등 유비쿼터스 환경으로 새로운 변화를 맞고 있다. 최근 의료계와 정부는 병원에 발생하는 모든 진료기록을 디지털화 하여 관리하는 전자의무기록(EMR)에 관심을 가지게 되었다. 특히 환자 진료데이터 기록은 계속적인 진료관리와 치료 내용을 기록한 것으로 매우 중요하며, 대형 의료기관을 중심으로 EMR시스템 도입이 늘고 있다. EMR시스템은 진료 중 발생한 환자의 진료정보를 전산화함으로써 고객서비스 향상, 대기시간 단축, 진료의 질 향상, 진료정보의 다양한 활용, 정확한 진료, 비용 절감, 진료부서 및 진료 지원부서 등의 업무효율화를 가져와 병원의 경쟁력을 확보하게 한다.