• 대기
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• 제28권3호
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• pp.263-272
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• 2018

The high-resolution ocean surface wind vector produced by scatterometer was assimilated within the Local Ensemble Transform Kalman Filter (LETKF) in Korea Institute of Atmospheric Prediction Systems (KIAPS). The Advanced Scatterometer (ASCAT) on Metop-A/B wind data was processed in the KIAPS Package for Observation Processing (KPOP), and a module capable of processing surface wind observation was implemented in the LETKF system. The LETKF data assimilation cycle for evaluating the performance improvement due to ASCAT observation was carried out for approximately 20 days from June through July 2017 when Typhoon Nepartak was present. As a result, we have found that the performance of ASCAT wind vector has a clear and beneficial effect on the data assimilation cycle. It has reduced analysis errors of wind, temperature, and humidity, as well as analysis errors of lower troposphere wind. Furthermore, by the assimilation of the ASCAT wind observation, the initial condition of the model described the typhoon structure more accurately and improved the typhoon track prediction skill. Therefore, we can expect the analysis field of LETKF will be improved if the Scatterometer wind observation is added.

• 한국조리학회지
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• 제14권2호
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• pp.193-204
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• 2008

The purpose of this study is to research about the relation between high-involving work system and organizational commitment of kitchen employees in food-service industry as one of the performance variables. For this research, a survey was done based on the people living in Seoul. Total 451 copies of questionnaire were distributed from $2^{nd}{$ April through $30^{th}$ in 2007. The collected data were used in analyzing frequency and factor through SPSS 14.0 and equation model LISREL 8.30 statistical package. The findings of this research are as follows: First, high-involving work system had a positive effect on self-leadership(t=5.85) and job satisfaction(t=3.71) but a negative effect on organizational commitment (t=0.76). But the final effect shows a positive result with job satisfaction as a mediating variable(t=5.99). Self-leadership had a positive effect on job satisfaction(t=9.51) but a negative effect on organizational commitment(t=0.91). This study suggested a desirable work system of organizational commitment for the improvement of productivity in foodservice industry. The concern and efforts of managers and executives to improve work environment for kitchen employees help to make quality better and improve the performance of a company with customer satisfaction.

• 한국산업정보학회논문지
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• 제8권2호
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• pp.72-83
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• 2003

본 논문은 기존 연구에서 제시된 교육리더쉽, 과정개선, 교육환경, 지역참여, 학생성과 및 교육품질 만족 등의 교육품질요인들 간의 인과관계를 경로분석을 이용하여 분석하였다. 본 논문에서는 교육품질요인들을 몇개의 측정변인으로 측정하고 SEM(구조방정식모형) 분야에서 가장 효율적인 AMOS를 이용하여 분석하였다. 교육 품질요인간의 인과관계분석을 위해서 본 논문에서는 위에서 제시한 요인들로 구조방적식모형을 설계하였다. 분석결과, 교육품질요인들 간에는 뚜렷한 인과관계가 나타났다. 특히 교육리더쉽이 중요한 원인변인이었으며 이것이 교육성과에 영향을 주고 나아가서 교육품질에 영향을 주는 전형적인 한국교육현상을 반영하고 있었다.

• 동서간호학연구지
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• 제7권1호
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• pp.82-93
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• 2002

The purpose of this study was to investigate the effect of Moxibustion on urinary incontinence, voiding performance, muscle strength of the hip and ADL in stroke patients. The subjects of this study were 20 stroke patients hospitalized at the division of oriental medicine in K university Hospital in the period from December 26, 2001 to March 15, 2002. The research design was one group pretest-posttest design. The pretest and posttest included measuring frequency of incontinence, voiding performance score, healthy and paralytic muscle strength of the hip, and the performance level for ADL after Moxibustion for one week. Data was analyzed using the SPSS package program with Wilcoxon Signed Ranks test. The result of this study were as follows : 1) The frequency of incontinence was decreased from 3.80(SD=3.41) to 2.10(SD=2.10) after Moxibustion, and that was statistically significant(z=-3.803, p=.000). 2) The score of voiding performance was increased from 22.15(SD=12.04) to 30.65(SD=14.73) after Moxibustion, and that was statistically significant(z=-3.828, p=.000). 3) The healthy muscle strength of the hip was increased from 25.97(SD=26.87) to 46.00 (SD=40.75) after Moxibustion, and that was statistically significant(z=-3.183, p=.001). 4) The paralytic muscle strength was increased from 17.42(SD=27.04) to 33.58(SD=37.28) after Moxibustion, and that was statistically significant(z=-2.315, p=.021). 5) The performance level for ADL was increased from 17.15(SD=9.52) to 24.60(SD=13.38) after Moxibustion, and that was statistically significant(z=-3.416, p=.001). According to the results of this study, Moxibustion is effective for decreasing urinary incontinence, and improving voiding performance, muscle strength of the hip and ADL. Consequently, these findings showed that Moxibustion is effective in improvement of urinary incontinence in stroke patients.

• 한국식품조리과학회지
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• 제23권3호통권99호
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• pp.302-313
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• 2007

The purpose of this study was to investigate the gap in perceived importance-performance between dietitians and parents regarding school foodservice sanitation practices, to establish a plan for improving the school foodservice monitoring that is conducted by parents. A survey was given using questionnaires and was distributed to 31 school foodservice dietitians and to parents who attended sanitation education in October 2006. All statistical analyses were conducted using the SAS package program(version 8.2 for Windows) for descriptive analysis, t-test, and importance-performance analysis(IPA). The results of the IPA showed the following areas as improvement priorities: (1) contracting with a reliable suppliers, (2) securing proper refrigerator and freezer capacity and checking temperatures, (3) adequate design and construction of foodservice facilities and equipment, and (4) ensuring trays and utensils are clean, dry, and stored in a way that prevents contamination. The results of the IPA illustrated that school foodservice dietitians performed well in 8 out of the 21 sanitation management items. The perceived importance by parents was higher than by dietitians for accurate record keeping and documentation of HACCP worksheets(p<0.01), appropriate cleaning plans and practices(p<0.05), garbage management of inner kitchens (p<0.05), and garbage management of external kitchens(p<0.05). On the other hands, the perceived importance by dietitians was higher than that of parents for contracting with a reliable suppliers(p<0.05) and adequate design and construction of foodservice facilities and equipment(p<0.01). According to the performance analysis there were significant differences between dietitians and parents in six out of the twenty-one items. For these six items, the evaluated degree of performance by parents was higher than that of dietitians. In conclusion, proper education programs should be planned and regularly performed for the student's patents who take part in school foodservice monitoring in order to improve on their monitoring.

• 정보처리학회논문지A
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• 제13A권1호
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• pp.45-52
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• 2006

분산 정보 시스템의 온-라인 유지보수를 위해서는 네트워크 내의 참여 노드들에게 파일을 배포하는 작업이 필수적이다. 이때 파일 배포에 대한 사용자들의 요청이 단기간에 집중되면, 배포 서버는 과부하 상태에 빠지며, 이를 플래시 크라우드(Flash Crowds)라 부른다. 플래시 크라우드를 회피하기 위한 일반적인 해결책은 하드웨어의 용량을 증설하는 것이다. 본 논문에서는 추가 비용의 발생 없이 P2P 기반의 소프트웨어적 해결책을 제안한다. 제안된 해결책에서 네트워크의 노드들은 인접한 노드들을 중심으로 서브네트워크들로 구성된다. 각 서브네트워크 내에서 배포 파일의 복사본은 노드들 상호간에 전송될 수 있어 배포 서버의 부하를 분산시킨다. 효율성을 높이기 위해 배포 대상 파일들은 하나의 패키지로 묶여지고 전송에 앞서 패키지는 동일한 크기를 갖는 다수의 세그먼트들로 분할된다. 정상 상태에서 배포 서버는 노드가 요청한 패키지를 세그먼트 단위로 전송한다. 그러나 배포 서버의 과부하 상태에서 노드가 필요한 세그먼트가 이미 서브네트워크 내에 존재할 경우, 서브네트워크 내의 노드는 필요한 세그먼트를 인접 노드로부터 전송받을 수 있다. 본 논문에서는 이를 처리하기 위한 자료구조와 알고리즘을 제안하고 시뮬레이션을 통해 성능 개선을 확인하였다.

• 한국산업정보학회논문지
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• 제4권4호
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• pp.111-116
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• 1999

본 논문에서는 마이크로스트립의 단점인 대역폭을 개선하기 위해 마이크로스트림 전송선로가 있는 유전체 층(layer)과 복사 다이폴이 있는 유전체 층사이에 또 하나의 기생 다이폴(parasitic dipole)을 갖는 유전체 층이 있는 3층(3-layer)의 구조를 갖는 안테나를 제시하였다. 제시된 구조에서 파라미터들(복사 다이폴의 길이와 offset 위치, 기생 다이폴의 폭과 길이 및 기생 다이폴의 offset 위치 등)을 변화하여 궤환 손실(return loss)을 계산한 후, 최적 대역폭을 갖는 3-layer 안테나를 설계하였다. 그리고 설계된 3-layer와 기생 다이폴이 없는 2-layer 안테나의 대역폭을 각각 비교하였으며 또한 안테나를 제작 실험하여 이론치와 실험치를 비교 검토하였다. 앙상블(Ensemble 5.1)을 사용하여 시뮬레이션 하였다

• 한국포장학회지
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• 제22권3호
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• pp.107-117
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• 2016

In order to reduce packaging and logistics costs for any business, it is important to identify opportunities for improvement throughout an entire logistics system including measurement of the performance and cost of packaging. Although the importance of packaging in a supply chain has been recognized by many scholars and experts, the total cost and value of packaging have not been successfully estimated. This paper reviews the recent researches and articles that tried to quantify the value of packaging focusing on the business decision between reusable and expendable shipping container systems. Three key factors such as cost, ownership, and standardization are identified and discussed in terms of impact on supply chain costs and performances. It is important to understand that the decision of a package system can change a logistics activities and even entire logistical system. Hence, the total cost and value of transport packaging should be calculated with understanding of interactions with logistical activities throughout supply chain. Identifying the opportunities and constraints of packaging changes on total logistics cost and activities must be carefully examined before implementation of a packaging system.

• 전기학회논문지
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• 제56권10호
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• pp.1763-1769
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• 2007

To improve the cycle-life and efficiency of an energy storage system for HEV, a dynamic control system consisted of a switch between a battery and an ultracapacitor module is proposed, which is appropriate for mild hybrid vehicle with 42V power net. The switch can be controlled based on the status of the battery and the ultracapacitor module, and a control algorithm that could largely decrease the number of high charging current peak is also implemented. Therefore the cycle life of the battery can be improved such that it is suitable for a mild hybrid vehicle with frequent engine start-stop and regenerative-braking. Also, by maximizing the use of the ultracapacitor, the system efficiency during high current charging and discharging operation is improved. Finally, this system has the effects that improves the efficiency of energy storage system and reduces the fuel consumption of a vehicle. To verify the validity of the proposed system, this paper presented cycles test results of different energy storage systems: a simple VRLA battery, hybrid energy Pack (HEP, a VRLA battery in Parallel with Ultracapacitor) and a HEP with a switch that controlled by energy management system (EMS). From the experimental result, it was proved the effectiveness of the algorithm.

• Journal of Welding and Joining
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• 제20권2호
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• pp.90-94
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• 2002

FC-BGA has advantages over other interconnection methods including high I/O counts, better electrical performance, high throughput, and low profile. But, FC-BGA has a lot of reliability issues. The 2nd level solder joint reliability of the FC-BGA with large chip on laminate substrate was studied in this paper. The purpose of this study is to discuss solder joint failures of 2nd level thermal cycling test. This work has been done to understand the influence of the structure of package, the properties of underfill, the properties and thickness of bismaleimide tiazine substrate and the temperature range of thermal cycling on 2nd level solder joint reliability. The increase of bismaleimide tiazine substrate thickness applied to low modulus underfill was improve of solder joint reliability. The resistance of solder ball fatigue was increased solder ball size in the solder joints of FC-BGA.