• Proceedings of the Korea Multimedia Society Conference
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• 2001.06a
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• pp.223-227
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• 2001

인터넷의 발전에 따라 서비스에 대한 사용자 요구가 다양해지는 동시에 서비스 품질에 대한 요구가 높아지고 있다. 멀티미디어 서비스는 대량의 데이터로 구성되어 네트워크에 트래픽 부하를 증가시키며 이로 인한 지연, 동기, 패킷 손실과 칼은 문제가 발생되나 서비스의 품질을 협상할 수 있다는 특성도 가지고 있다. 이 연구에서는 인터넷에서 제한된 대역폭의 사용 효율성을 높이면서 멀티미디어 서비스의 품질(QoS)을 보장하기 위한 기법으로 동기화된 멀티미디어 서비스의 QoS와 통계에 기반을 둔 지수적 무게 이동 평균 기법을 제안하였고, 협상을 위한 모듈을 설계하였다.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2006.05a
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• pp.330-332
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• 2006

방사선의 조사 유무에 따른 배추와 상추의 발아지수를 평가함으로써 60일 간의 퇴비화 공정에서의 퇴비 품질과 독성을 평가하고자 하였다. 또한 온도, 휘발성 유기화합물, 퇴비 숙성도 등을 평가함으로써 방사선 조사의 퇴비화 에 대한 영향을 분석하였다. 방사선의 높은 에너지는 하수슬러지 내 미생물을 사멸하고 독성유기물을 분해하여 하수슬러지 퇴비 품질을 향상시키는 것으로 확인했다.

• Journal of the Korean Recycled Construction Resources Institute
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• v.1 no.1
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• pp.49-57
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• 2013

Recently, recycling of industrial by-products and CO2 reduction have been important issues in the world. In this reason, applications and reuse of Fly ash as a binder for concrete, which is generated in thermoelectric power plant, have been one of the effective recycle methods. In order for Fly ash to be applied to concrete, Korean Standard(KS) has selected and managed quality such as $SiO_2$, fineness, specific gravity, ignition loss and activity index. However, there is a limits for activity index, whose test period required is at least 28 days or 91 days. Activity index is the critical indication standard to determine mechanical strength of concrete that contained Fly ash. To complement the disadvantage of test method, this research provided "API test method", which quickly measure Pozzolanic reaction of Fly ash can be considered as a alternative of activity index. Then, the adaptable API test method need to be investigated through comparative analysis with the test result of API, activity index and K-value. The test method can make evaluation of Fly ash quality faster and more accurate. As a result, most Fly ash produced in Korea has not been satisfied in the KS quality standard except water content and specific gravity, and especially fluidized bed boiler ash has its characteristics. Also, API, activity index and K-value have superior interrelationship. The interrelationship between API and activity index and K-value gets increased as the material age gets higher, so API test can be considered as very useful test method for Pozzolanic reaction evaluation of Fly ash.

• Weed & Turfgrass Science
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• v.5 no.1
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• pp.42-50
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• 2016

Superintendents have been used microbial fertilizers to improve turfgrass growth and quality and to decrease turfgrass diseases in golf course. This study was conducted to investigate the effects of compound fertilizer containing microbe (MF) on the growth and quality of creeping bentgrass with turf color index (TCI), chlorophyll index (ChI), root length, turfgrass density, clipping yield and nutrient content. Treatments were designed as follows; non-fertilizer (NF), compound fertilizer (21-17-17; CF) as control, compound fertilizer (14-6-17) containing microbe. In pot experiment, TCI and ChI of creeping bentgrass in MF plot were similar to those in CF. But clipping dry weight of MF plot increased by 39.1% compared to that of CF plot. At field experiment applied with MF treatment, TCI, ChI, root length, and nutrient content and uptake of creeping bentgrass were similar to those with CF treatment, but turfgrass density with MF higher about 7.9-15.8% than with CF. These results indicated that the application of MF improved growth and quality of creeping bentgrass by enhancing clipping yield and shoot number.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2023.05a
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• pp.303-305
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• 2023

수집된 데이터의 품질을 진단하고 개선하는 것은 품질 관리 측면에 있어 중요하다. 본 연구에서는 항로표지 수집정보의 품질을 개선하기 위해 새로운 알고리즘을 개발하고 이를 시험하는 방안에 대해 분석하였다. 개발된 알고리즘은 기존의 알고리즘보다 더욱 정확하고 신뢰성이 높으며, 항로표지 수집정보의 오류율을 크게 감소시킨다. 이에 따라, 개발된 알고리즘을 적용함으로써 항로표지 수집정보의 품질을 향상시킬 수 있으며, 해상 안전성을 높이는 데 기여할 것으로 기대된다.

• Weed & Turfgrass Science
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• v.4 no.3
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• pp.249-255
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• 2015

Trichoderma spp. were famous fungi used for turfgrass management in golf course. This study was conducted to evaluate effects of two microbial fertilizers containing Trichoderma harzianum and T. atroviride on the growth and quality of creeping bentgrass with turf color index, chlorophyll index, root length, shoot number, clipping yield and nutrient content. Treatments were designed as follow; non-fertilizer (NF), control fertilizer (CF), T. harzianum (TH), and T. atroviride (TA). Chlorophyll index and root length of TH and TA were increased than these of CF and shoot number and content and uptake of nitrogen (N) of TA higher than these of CF. The N content in turfgrass tissue was significantly related to shoot number, root length and N uptake (P<0.05) and shoot number was positively relate to chlorophyll index (P<0.05). These results indicated that application of Trichoderma harzianum and T. atroviride improved a growth and quality of creeping bentgrass by promoting N uptake.

• The Journal of the Korea Contents Association
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• v.18 no.12
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• pp.25-34
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• 2018

With the higher competition of university environment, universities has been adapted Customer Satisfaction Index (CSI). However, the problem of CSI focuses on score and ranking announcement. In public sectors, PCSI model is used because of increasing its strategic utilization by providing diagnosis of the phenomenon and direction for future improvement through causal model analysis. The purpose of this research is to develop a measurements of university satisfaction using PCSI. This research demonstrates validity and reliability of PCSI using test-retest method using multi-group confirmatory factor analysis. The results of this research indicate that the reliability and validity of the PCSI model is verified. Service product quality, service delivery quality, environment quality and social quality have positive effects on customer satisfaction. In turn, customer satisfaction have positve effects on university performance and social performance. In conclusion, service quality, PCSI, and service performance are clarified to be appropriate components of the satisfaction survey. These results can be used to measure the satisfaction level of education at actual universities. It is expected that practical basic data can be obtained to improve the quality of university education.

• Journal of KIISE:Software and Applications
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• v.31 no.7
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• pp.911-921
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• 2004

Accurate minutiae extraction from input fingerprint images is one of the critical modules in robust automatic fingerprint identification system. However, the performance of a minutiae extraction is heavily dependent on the quality of the input fingerprint images. If the preprocessing is performed according to the fingerprint image characteristics in the image enhancement step, the system performance will be more robust. In this paper, we propose a knowledge-based preprocessing method, which extracts S features (the mean and variance of gray values, block directional difference, orientation change level, and ridge-valley thickness ratio) from the fingerprint images and analyzes image quality with Ward's clustering algorithm, and enhances the images with respect to oily/neutral/dry characteristics. Experimental results using NIST DB 4 and Inha University DB show that clustering algorithm distinguishes the image Quality characteristics well. In addition, the performance of the proposed method is assessed using quality index and block directional difference. The results indicate that the proposed method improves both the quality index and block directional difference.

• Management & Information Systems Review
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• v.35 no.3
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• pp.249-272
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• 2016

This study based on dual aspects of service quality aims at classifying service quality attributes by Kano model and also providing the necessity to decide which service quality would be carried out preferentially in the service industries(hotel service, repair service, education service, medical service). The first purpose of this study, therefore, is assorting the service quality by the Kano model about four service industries based on Schmenner's service process matrix. Secondly, this has an intention of drawing preferred considerations and putting forward measures to increase the customer satisfaction by Timko and PCSI Index. The result of this study is as follows. First of all, it was found that tangible attributes classified the attractive quality and Timko's score also was very high in four service industry. That is to say that tangible attributes in service industries could be interpreted into having very high importance at standards on service quality estimation of customer. Second, all but repair service of the service industries suggested empathy dimension to have flexibility solving and understanding the customer's problem could be improve the customer satisfaction. Finally, the common result between them was empathy dimension classified attractive quality in all industries. That is because present satisfaction was not reached customer expectation so there would be a improvement of empathy dimension preferentially.

• Proceedings of the Korea Water Resources Association Conference
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• 2019.05a
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• pp.180-180
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• 2019

본 연구의 목표는 돌발홍수 예 경보시스템(Flash Flood Warning System, FFWS)의 효용성 극대화를 위한 레이더 자료의 품질향상 기법을 개발하는 것이다. 지금까지 사용되어온 레이더 자료의 품질향상 기법들은 모두 자료의 평균값에 맞추어져 개발되었다. 그러나 돌발홍수 예 경보시스템에서 사용되는 강우강도 임계값은 평균값과 큰 차이가 난다. 따라서 레이더 자료를 이용하여 추정하는 큰 강우강도의 신뢰도는 떨어지게 된다. 이에 본 연구에서는 돌발홍수 예 경보시스템에 사용되는 목표 강우량에 대한 강우추정 관계식의 매개변수 추정 기법을 개발하고자 한다. 이를 위해 비슬산 레이더 반사도 자료와 비슬산 레이더 관측반경 내 위치한 AWS 지점의 강우자료를 이용하였다. 먼저, 강수입자분포(Drop Size Distribution, DSD)를 지수분포로 가정하여 유도한 레이더 강우추정 관계식을 재검토하였다. 다음으로 관측된 비슬산 레이더 반사도 자료를 10dBZ 단위로 구분하여 레이더 반사도 구간별로 레이더 반사도 자료와 강우자료 쌍에 대한 DSD 매개변수를 산정하였다. DSD 매개변수를 산정하기 위해 비슬산 레이더 반사도 자료와 AWS 지점의 강우자료를 지수분포로 가정하여 유도한 강우추정 관계식에 적용하였다. 다음으로 목표 강우량에 대한 강우추정 관계식의 매개변수 추정을 위해 레이더 반사도 구간별로 DSD 매개변수의 대푯값을 결정하였다. 마지막으로 지수분포로 가정하여 유도한 레이더 강우추정 관계식에 레이더 반사도 구간별 DSD 매개변수의 대푯값을 적용함으로써 목표 강우량에 대한 강우추정 관계식의 매개변수를 추정하였다.