• Proceedings of the Korean Environmental Sciences Society Conference
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• 2005.11a
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• pp.137-140
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• 2005

Alum과 PDDA에 대하여 각각 휴믹산의 플럭 형성-파괴-재형성을 관찰 한 결과 sweep flocculation에 의해 휴믹 플럭을 형성하는 alum은 플럭의 파괴 및 재형성은 비가역적이이나 유기응집제인 PDDA 플럭의 파괴는 가역적이라는 것을 알 수 있었다. 그리고 플럭 강도지수 측정으로부터 PDDA는 alum보다 높은 강도를 가지는 것을 알 수 있었다. 그리고 플럭강도에 미치는 이온강도의 영향을 살펴 보면 alum은 플록강도에 미치는 영향이 거의 없었지만 유기응집제인 PDDA는 플럭 강도가 크게 감소함을 알 수 있었다.

• Journal of the Korean Society for information Management
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• v.33 no.1
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• pp.7-32
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• 2016

This study has measured interdisciplinarity using a topic modeling, which automatically extracts sub-topics based on term information appeared in documents group unlike the traditional top-down approach employing the references and classification system as a basis. We used titles and abstracts of the articles published in top 20 journals for the past five years by the 5-year impact factor under the category of 'Information & Library Science' in JCR 2013. We applied 'Discipline Diversity' and 'Network Coherence' as factors in measuring interdisciplinarity; 'Shannon Entropy Index' and 'Stirling Diversity Index' were used as indices to gauge diversity of fields while topic network's average path length was employed as an index representing network cohesion. After classifying the types of interdisciplinarity with the diversity and cohesion indices produced, we compared the topic networks of journals that represent each type. As a result, we found that the text-based diversity index showed different ranking when compared to the reference-based diversity index. This signifies that those two indices can be utilized complimentarily. It was also confirmed that the characteristics and interconnectedness of the sub-topics dealt with in each journal can be intuitively understood through the topic networks classified by considering both the diversity and cohesion. In conclusion, the topic modeling-based measurement of interdisciplinarity that this study proposed was confirmed to be applicable serving multiple roles in showing the interdisciplinarity of the journals.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2001.11a
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• pp.395-396
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• 2001

고온의 산업공정에서 발생하는 에어로졸 입자들은 많은 기본입자(primary particle)들로 이루어진 불규칙한 사슬구조를 가진다 (Matsoukas and Friedlander, 1991). 이러한 비구형 프랙탈 입자들의 거동은 구형 입자들과 비교할 때 큰 차이를 보인다. 프랙탈 입자들의 부피는 충돌반경의 거듭제곱으로 나타낼 수 있으며, 프랙탈 차원이라 불리는 그 지수는 1에서 3 사이의 값을 가진다. 자유분자영역에서의 브라운 응집에 대한 해석해는 Lee et al.(1990)에 의해 제시된 바 있으나, 이는 구형입자를 가정한 결과였고, 비구형 프랙탈 입자의 거동을 해석하려 할 때는 이로 인한 오차가 발생하게 된다. (중략)

• Journal of Korean Society for Geospatial Information Science
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• v.23 no.3
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• pp.49-55
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• 2015

Current medical delivery system in Korea has been distinguished into three types; primary medical facilities, secondary facilities, and tertiary facilities since 1989. This system prevents the waste of medical resources along with the maintenance of balance according to the medical treatment subjects. However, it is inevitable that the imbalance of the medical services among regions has been generated due to the concentration of the medical facilities on large cities. In this regard, this study attempted to evaluate the quality of the primary medical services, emphasizing accessibility and convenience targeting Jinju city, a small and medium-sized city, based on the distribution characteristics of the space. The study results show that cohesion index about the spatial distribution of the primary care facilities was 0~0.25. It conducted a correlation analysis between the location of the hospitals and users, based on the study results. Finally, it is demonstrated the correlation between the location of the hospitals and users tended to be low, while, the cohesion of the Oriental medicine clinics was high in other treatment subjects, and the accessibility to the Oriental medicine clinics was the highest because most Oriental medicine clinics were distributed to the places where users were many. However, on account that the locations of the medical facilities and users were varied in other treatment subjects except for the Oriental medicine clinics, problems were generated in terms of the accessibility. Therefore, it is judged that the preparation of the measures to improve the selection of lots in consideration of users, who use the primary medical services, is required.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.9 no.7
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• pp.1582-1587
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• 2005

In coagulant control of water treatment plants, rule extraction, one of datamining categories, was performed for coagulant control of a water treatment plant. Clustering methods were applied to extract control rules from data. These control rules can be used for fully automation of water treatment plants instead of operator's knowledge for plant control. To perform fuzzy clustering, there are some coefficients to be determined and these kinds of studies have been performed over decades such as clustering indices. In this study, statistical indices were taken to calculate the number of clusters. Simultaneously, seed points were found out based on hierarchical clustering. These statistical approaches give information about features of clusters, so it can reduce computing cost and increase accuracy of clustering. The proposed algorithm can play an important role in datamining and knowledge discovery.

• Journal of Korean Society of Environmental Engineers
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• v.22 no.11
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• pp.2025-2036
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• 2000

A physicochemical process called ultra rapid coagulation(URC) was applied as a pilot scale to recover eutrophicated lake water at Inkyung Lake located on-campus in Inha university. The URC was uniquely designed to completely remove the presence of phosphorus up to 95%, which in turn leading to lessen the level of eutrophication of lake. For a pilot test of period, the lake was restored showing Carlson's Trophic State Index(TSI) of mesotrophic state which accounts for the reduction of total phosphorus and chlorophyll-a down to approximately 55 from 70 and 73, respectively. A residual presence of aluminum and additional coagulants in the effluent was tested for their potential effects on Photobacterium phosphoreum. The effect concentration ($EC_{50}$-15 min) observed in the effluent revealed that the bioactivity of Photobacterium phosphoreum was not influenced by the residual presence of coagulants. After the pilot test of period, the lake was consequently restored as a mesotrophic state in obtaining the second grade of lake water quality. The URC may be further applied for restoration of greater scale of lake in eutrophication.

• Journal of the Korean Society for Nondestructive Testing
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• v.32 no.5
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• pp.494-501
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• 2012

In the present paper, the ultrasound blood images were measured at both the human radial artery(RA) and common carotid artery(CCA), depending on the age, and the pulsatility index of blood echogenicity(PIBE) was analyzed. In addition, the ultrasound blood images were measured at both RA and CCA of both the stroke patients and the control group, and PIBE was compared. PIBE of RA for the young group was similar with that for the old group ($0.13{\pm}0.11$ and $0.16{\pm}0.03$). PIBE of CCA for the young group, however, was larger than that for the old group ($0.70{\pm}0.21$ and $0.32{\pm}0.01$), and was more variable depending on the subject. Similarly, the fibrinogen concentrations of the patients ($336{\pm}61$ and $340{\pm}126mg/dl$) were more than that of the control group ($264{\pm}38$ and $257{\pm}43mg/dl$), for both RA and CCA. The results indicate the possibility of the ultrasonic test on the correlation between erythrocyte aggregation and stroke, and it is expected that the in-vivo EA measurement would be clinically useful.

• Korean Journal of Food Science and Technology
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• v.52 no.4
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• pp.357-362
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• 2020

This study was conducted to investigate the effects of mushroom composition (0, 4, 8, and 12%) on the quality characteristics of an extruded meat analog. The meat analog blend was isolated soy protein, wheat gluten, and corn starch (50:40:10). The extrusion condition was set to 55% feed moisture, 170℃ barrel temperature, and 150 screw speed by high moisture extrusion using a twin-screw extruder equipped with a cooling die. The integrity index, hardness, cohesiveness, springiness, chewiness, and cutting strength of the meat analog increased with the increasing mushroom content, while its water holding capacity and nitrogen solubility index (NSI) decreased. The protein digestibility decreased with the increasing mushroom content, while the DPPH radical scavenging activity significantly increased. In conclusion, the incorporation of mushrooms into the investigated meat analog enhanced its texture and antioxidant level.

• Journal of Korean Society of Environmental Engineers
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• v.30 no.8
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• pp.775-780
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• 2008

Sludge conditioning is widely used to improve aggregation and dewaterability of waste sludge in sludge treatment processes. The study aims to examine quantitative correlations between coagulant dosage and sludge cake dewaterability using three kinds of coagulants, such as an aluminum sulfate, a ferric chloride, and a poly aluminum chloride(PAC). When an aluminum sulfate, a ferric chloride, and a PAC were injected with 0.79$\sim$1.19 mmol/g, 0.61$\sim$1.25 mmol/g TSS, and 0.21$\sim$0.39 mmol/g TSS, respectively, specific resistances to filtration of the sludge were decreased at 95.0% or more. This study shows that the correlation between coagulant dosage per g sludge(D) and normalized specific resistance to filtration(R) could be expressed by the exponential functions.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 1997.10a
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• pp.139-142
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• 1997

본 논문에서는 기존 FCM(Fuzzy C-Means) 타입 클러스터링 알고리즘의 선은 향상을 위한 설계 방법을 제시한다. 우선 클러스터의 응집성(compactness)과 분리성(separation)을 동시에 고려한 성능 지수를 정의하고, 이를 진화 프로그램을 통하여 최적화 한다. 또한 실험을 통하여 기존 연구들과의 비교 및 제안된 방법론의 유효성을 보인다.