• Asia pacific journal of information systems
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• 제29권4호
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• pp.615-643
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• 2019

Now is the time for IS scholars to demonstrate the added value of academic theory through its integration with text mining, clearly outline how to implement this for text mining experts outside of the academic field, and move towards establishing this integration as a standard practice. Therefore, in this study we develop a systematic theory-based text-mining framework (TTMF), and illustrate the use and benefits of TTMF by conducting a text-mining project in an actual business case evaluating and improving hotel service quality using a large volume of actual user-generated reviews. A total of 61,304 sentences extracted from actual customer reviews were successfully allocated to SERVQUAL dimensions, and the pragmatic validity of our model was tested by the OLS regression analysis results between the sentiment scores of each SERVQUAL dimension and customer satisfaction (star rates), and showed significant relationships. As a post-hoc analysis, the results of the co-occurrence analysis to define the root causes of positive and negative service quality perceptions and provide action plans to implement improvements were reported.

• 한국방재안전학회논문집
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• 제12권3호
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• pp.59-67
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• 2019

본 연구에서는 건설현장을 대상으로 무인항공기(UAV) 촬영을 통하여 얻어진 사진측량 자료를 이용하여 작업발판 등의 가설시설물 설치에 대한 적정성을 검토하였다. 연구대상은 강원대학교 삼척캠퍼스내 건물보강공사를 위한 가시설물이다. 검토대상은 강관비계의 띠장방향 비계기둥 간격, 장선방향 비계기둥 간격, 띠장 간격이다. 무인항공기 측량자료를 이용하여 검토한 결과 장선방향 비계기둥 간격은 기준을 잘 준수하여 설치되어 있었으나, 띠장방향 비계기둥 간격과 띠장 간격은 기준에 미달된 개소도 다수 발견되어 개선이 요구되었다. 특히 띠장 간격은 대부분 지점에서 기준에 미달되어 있었다. 무인항공기촬영으로 3차원 자료를 이용하여 입체적인 측량이 가능하여, 타 시설물에 가려져 있거나 내부에 위치한 시설물도 측량이 가능하였다. 무인항공기 촬영을 통하여 신속하게 현장의 상태를 자료화할 수 있으며, 현장인력의 작업을 방해하지 않고 측량을 수행할 수 있었다. 가시설물의 설치기준은 작업자의 안전확보를 위해 반드시 준수되어야 함에도 불구하고 현장에서는 아직 소홀히 다루어지고 있음을 알 수 있었다. 현장공정관리에 무인항공기 등을 활용하여 정기적으로 점검을 할 수 있도록 법적 제도가 보완되어야 한다고 판단되었다.

• 생태와환경
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• 제36권1호통권102호
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• pp.66-73
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• 2003

본 연구에서는 총 유입 (1,100 mm)의 반 정도가 강우로부터 유입되었고, 나머지는 관개로부터 유입되었다. 유출은 총 유출량의 반 정도(47${\sim}$54%)가 배수에 의한 유출이였으며, 식물의 성장을 위한 증발산량이 40${\sim}$46%이었다. 지표배수의 경우 강우에 의한 유출과 중간낙수가대부분을 차지하였다. 인과 질소의 영양물질 수지는 유입수의 대부분은 시비로부터 공급되고(78${\sim}$96%),대부분의 유출은 식물체생산(86${\sim}$94%)으로 발생되었으나, 지표배수를 통한 영양물질의 손실량(6${\sim}$l2%)도 많은 부분을 차지하였다. 시비량의 차이는 지표배수를 통한 영양물질 손실과 수확량에 적은 영향를 미치는 것으로 보아 낮은 시비량적용만으로는 영양물질 유출을 감소시키기에는 큰 효과를 기대할 수 없다. 순배출부하량의 분석결과 논농사는 일반적인 강우량의 범위에서 오염물질배출원 보다는 수질 보호의 순기능이 있는 것으로 나타났다. 지표배수를 통한 영양물질 손실의 감소는 지표배수를 줄임으로서 효과를 기대할 수 있다. 담수심을 줄여 관개수를 절약하고, 논뚝에서 물꼬의 높이를 증가시키고, 강제배수를 최소화 하는 방법들은 지표배수를 저감하기위한 대안으로 제안된다. 이러한 영농방법은 물 절약과 수질 보호가 가능하지만, 영농방법의 변화는 수확량에 영향을 줄 것이라 생각되며 더 많은 연구를 필요로 할 것으로 판단된다.

• 한국수자원학회논문집
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• 제37권3호
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• pp.249-255
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• 2004

농업용수 회귀율을 조사하기 위하여 2003년 관개기 동안 많은 실측을 수행하였다. 본 연구지역은 경상남도 창녕군에 위치한 대암양수장 유역일원이다. 관개용수를 공급하기위하여 건설된 대암 양수장 유역 내 논에 대하여 물수지분석을 실시하였다. 본 연구지역에서의 일 강우량 자료를 수집하였으며, 또한 관개율, 배수율, 침투 및 증발산을 실측하였다. 관개량과 배수량은 기록형수위계(GTDL-L10)를 설치하여 관계기 동안 지속적으로 관측하였다 침투 및 증발산은 직경 3mm PVC 감수심계 및 직경 200mm PVC 침투계를 이용하여 측정하였다. 총관개량 및 총 지표배수량은 654.7mm와281.2mm로 나타났으며, 총 침투량과 총증발산량은 각각 36.0mm 및 160.0mm였고, 일평균 증발산량은 4.3mm/d 였다. 신속회귀율과 지연회귀율은 각각 43.0% 및 5.5%로 전체회귀율은 48.5 %로 나타났다. 따라서, 본 시험지구에서 공급된 관개용수량이 설계기준보다 훨씬 많은 양의 관개용수를 공급하고 있음을 알 수 있었다. 이는 적정한 용수관리원칙 보다는 지역주민들의 요구에 의한 과다공급으로 인한 부적적한 용수관리에 기인하는 것으로, 추후에 농업용수설계기준을 현실에 맞게 변경해야함을 의미한다.

• 한국철도학회논문집
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• 제15권6호
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• pp.670-681
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• 2012

본 연구에서는 철도 선로용량 산정 관련 다양한 기존 연구들을 재검토한다. 국내외에서 대표적인 이 분야 3가지 방법(야마기시, UIC 및 TCRP 방법)들을 사례와 함께 설명한다. 먼저 국내에서 가장 많이 활용되는 방식이면서도 각 단계에 대해 명확하게 이해되지 않았던 야마기시 방법의 산식 전개과정을 명확하게 제시한다. 또한, 다양한 해석적 방법의 하나로써 이 방법의 발전적 활용방안을 제시한다. 다음 최근 유럽에서 표준적으로 사용되는 UIC 406 방법의 제정 과정과 적용 방법을 설명한다. 마지막으로 도시철도의 수송용량 분석에 주로 활용되는 TCRP 방법의 특징을 설명하고, 이 3가지 방법의 특징을 비교 분석한다. 본 논문은 이 분야 현업 종사자들이 현재 사용 중인 철도 선로용량 산식에 대한 이해를 향상하고, 국제적으로 통용되는 방법의 국내 적용 활성화에 기여할 것으로 판단된다.

• 대한디지털의료영상학회논문지
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• 제12권2호
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• pp.71-79
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• 2010

Thanks to the great development of technology in radiation, we are now able to reduce radiation exposure to the patients, and the radiographer and expenses in medical sector. We are also trying to produce ideal images which maintain useful information. These kinds of effort are increasing over the world. For that reason, we should get images which include necessary data of patients. Then it also can help to reduce radiation exposure to the patients. Therefore, we need to know the problems that cause a falling off in image's quality and check on generator in case of their electronic and mechanical errors. And moreover, we should anticipate the possibility of devices errors and prevent them with regular quality control. This investigation was conducted in medical institutions, institute of educations and hospitals. They are all in Seongnam-City. We used PMX-III, kVp meter to implement kVp test, mR / mAs output test, light fiel / beam alignment test, Reproducibility of exposure dose, half value layer test, reproducibility of exposure time test. in the case of hospitals, they perceive the importance of regular quality control and organize the regular quality control team so they can be satisfied with the error standard in most experiments. On the other hand, when it comes to medical institutions and institute of educations, they perceive the importance of regular quality control less than hospitals do. Radiographer need to understand the importance of regular quality control and practice it so they can get the fine ideal image with the lower dose to the patient.

• 설비공학논문집
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• 제8권3호
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• pp.397-412
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• 1996

This study aims to present the fundamental strategies to improve the Indoor Air Quality (IAQ) in apartment buildings. To investigate the concentration of indoor air pollutants such as radon, formaldehyde, and VOCs, both the document survey and the field measurement were conducted. In addition, to identify the source of the air pollutants, the laboratory experiment was carried out for various building materials. Finally, the minimum period to be reserved befor3e building occupation to ensure healthy IAQ, which largely depends on the ventilation rates, was simulated using a simple compuer program. The results of this study can be summarized as follows: 1. In case of newly-constructed apartment houses, concentrations of formaldehyde, VOCs and radon were found to exceed the standard. Meanwhile, at existing apartment houses, concentrations of VOCs, particularly toluene and xylene, highly exceeded the standasrd level. Concentrations of formaldehyde and radon, however, had been lowered according to the duration of occupation. 2. The laboratory experiment of concentration of pollutants per square meter of building material surface area showed that radon gas was much emitted from the gypsumboard; formaldehyde from flooring and wallpaper; and VOCs from paints and kitchen furnishings. The emission rates of formaldehyde and VOCs were proportional to air temperature. 3. According to the simulation of the minimum period to be reserved before occupation, newly-constructed airtight houses required about 190-200 days, and naturally ventialted houses with fully-open-windows required about 20-45days, in order to keep the level of radon gas lower than standard. Therefore, with the current practice, the date of occupation should be delayed for about 15 days.

• Nuclear Engineering and Technology
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• 제48권6호
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• pp.1360-1367
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• 2016

This paper introduces a boron meter with improved accuracy compared with other commercially available boron meters. Its design includes a new fitting function and a multi-detector. In pressurized water reactors (PWRs) in Korea, many boron meters have been used to continuously monitor boron concentration in reactor coolant. However, it is difficult to use the boron meters in practice because the measurement uncertainty is high. For this reason, there has been a strong demand for improvement in their accuracy. In this work, a boron meter evaluation model was developed, and two approaches were considered to improve the boron meter accuracy: the first approach uses a new fitting function and the second approach uses a multi-detector. With the new fitting function, the boron concentration error was decreased from 3.30 ppm to 0.73 ppm. With the multi-detector, the count signals were contaminated with noise such as field measurement data, and analyses were repeated 1,000 times to obtain average and standard deviations of the boron concentration errors. Finally, using the new fitting formulation and multi-detector together, the average error was decreased from 5.95 ppm to 1.83 ppm and its standard deviation was decreased from 0.64 ppm to 0.26 ppm. This result represents a great improvement of the boron meter accuracy.

• 대한영양사협회학술지
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• 제8권1호
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• pp.33-41
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• 2002

This study has been focused on understandings for the problems of dietitian who perform nutrition service in the field of industry foodservice and then focused on using of its findings as basic material for smooth nutrition service performance through analyzing job satisfaction, job characteristic and its importance of dietitians' task in industry foodservice. A questionnaire survey of 120 nutritionists who have engaged themselves in industry foodservice―60 are under direct management and 60, held in trust―has been performed, and 95 responses (79%) have been collected and categorized, except some unfinished responses. The examined data have been classified statistically by using of SPSS, and then analyzed into frequency, percentage, mean value, standard deviation, and correlation among factors, according to questionnaires. The findings of the research can be summarized as following: The details of the surveyed dietitians were: 20-25 years old on an average; working less than two years; college graduates; mere employees; receiving monthly pay of 70～100 won on an average; working more than 52 hours weekly; and providing with four meals a day in a single menu. For job satisfaction and job characteristic, the service itself and the understanding of the service appear as main features. For the relative importance of the service, the findings show that the menu making, sanitation and cost control occupy an important position, while nutrition counseling, nutrition education and dietary control by ailments make up very low portion. For the cause of not enacting the nutrition service, the lack of counseling ability and the overburden of food service are at the top. The findings of this research, therefore, present the needs of the service capacity education and the reduction of excessive foodservice hours of dietitians in order to secure the efficient nutrition service in industry foodservice. To achieve this goal, first of all, there should be an intensive education course in school by using of practice hours. for enhancing practical service adaptability, and then the computerization of foodservice should be executed perfectly to reduce the excessive foodservice hours.

• 한국토양비료학회지
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• 제45권6호
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• pp.1187-1193
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• 2012

Water control is mainly one of the key factors that can affect nitrous oxide ($N_2O$) emissions from soils. This study was undertaken to determine the effect of intermittent drainage compared to continuous flooding (conventional water regime) on $N_2O$ emission to global warming potential (GWP) with NPK (standard cultivation practice), NPK+Straw, and PK fertilizations. Nitrous oxide emission rates were collected twice a week using a closed chamber method. With continuous flooding, nitrogen (N) application increased $N_2O$ emission by 106.6% ($0.64kg\;ha^{-1}$ in NPK) with respect to the PK treatment ($0.31kg\;ha^{-1}$), and straw addition to NPK enhanced 148.3% of seasonal $N_2O$ flux ($0.77kg\;ha^{-1}$ in NPK+Straw). Although seasonal $N_2O$ emission slightly increased by 16.1-42.9% with intermittent irrigation, its seasonal $CH_4$ emission drastically reduced at 43.5-52.8% resulting in a lower GWP at 48.9-58.5% with respect to that of continuously flooded treatments ($4.51Mg\;CO_2\;ha^{-1}$, PK; $7.60Mg\;CO_2\;ha^{-1}$, NPK; $14.55Mg\;CO_2\;ha^{-1}$, NPK+Straw). Rice yield, at similar fertilization with the continuously-flooded rice field, was not affected by intermittent irrigation. Conclusively, intermittent irrigation can be very effective and a rational soil management strategy to mitigate GWP with considering rice productivity in a temperate paddy rice field like Korea.