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羅泫植 호남대학교 1991 호남대학교 학술논문집 Vol.12 No.1
The primary goals of software development are to improve the quality of products and to increase the productivity of programmers within restricted cost and time. In order to accomplish these goals it is provided the systematic management concerned with technological discipline in the development process. In this paper the phases and characteristics of some typical development life-cycle models are discussed. Thereafter I'll propose a development process model for application softwares of traditional data processing. Here, I define the phases of process, and describe the contents of activities and documents.
구아검 첨가가 3D 프린팅을 위한 수리미 혼합물의 특성에 미치는 영향
나현식,김동현,이하영,이상민,유현지,서고운,고창현,박선우,최형욱,최예진,조미정,김동우,안동현,Hyun-Sik Na,Dong-Hyeon Kim,Ha-Young Lee,Sang-Min Lee,Hyeon-Ji Yu,Go-wun Seo,ChangHyeon Ko,Seon-Woo Park,Hyung-Wook Choi,Ye-Jin Choi,Mi Jeong Jo,Dong 한국수산과학회 2023 한국수산과학회지 Vol.56 No.6
Guar gum is an edible starch extracted from Cyamopsis tetragonolobus and used as an auxiliary ingredient to enhance the viscosity and adhesiveness of food and improve its emulsification stability. Here, characteristics of fish surimi mixture with various added amounts (0, 0.23, 0.45, 0.67, and 0.89 wt%) of guar gum were analyzed. In unheated surimi with guar gum, the pH decreased as the content increased. In the color values analysis, only the b<sup>*</sup> (yellowness) increased depending on the amount of added guar gum. The firmness increased with increasing guar gum content, and no significant difference in adhesiveness was observed. In heated surimi, a<sup>*</sup> (redness) and b<sup>*</sup> decreased in a content-dependent manner, and L<sup>*</sup> (lightness) was higher than that of unheated surimi. Regarding physical properties, the highest values of hardness, gumminess, and chewiness were observed in the heated surimi with 0.67 wt% of guar gum. However, no significant change was observed in springiness and cohesiveness. Results of sensory evaluation indicated that with higher guar gum content, only the hardness increased slightly, and significant differences were absent in the remaining parameters. Thus, surimi with 0.67 wt% of guar gum is considered to be optimal for 3D printing.
수치 데이터 세트에서 Tomek Links 방법과 Balancing GAN을 결합한 불균형 데이터 문제 개선 기술
나현식,박소희,최대선 한국정보과학회 2020 정보과학회논문지 Vol.47 No.10
Machine Learning is useful due to its good performance and application in various fields such as data classification, voice recognition and predictive models. However, there exists a problem regarding the imbalance between classes in the training dataset, which degrades the classification performance of the minority class. In this paper, we propose a new data augmentation method that combines the Balancing GAN and Tomek Links Method to solve the Imbalanced Data problem and find a clear decision boundary. To verity the proposed method, we have evaluated the performance according to the classification model using five datasets. Moreover, the performance has been compared with Data Sampling and GAN based Data Augmentation Techniques. The results showed that the classification performance was improved or maintained by 0.05~0.195 in 17 of the total 25 performance evaluations. The method proposed in this paper showed the potential as a new method to solve the Imbalanced Data problem. 머신러닝은 데이터 분류, 음성인식, 예측 모델 등 다양한 응용 분야에서 좋은 성능으로 유용하게 이용되고 있다. 하지만 학습 데이터 세트의 클래스 간 불균형으로 인해 소수 클래스에 대한 모델의 성능이 저하되는 문제가 있다. 본 논문에서는 불균형 데이터 문제를 해결하고 명확한 결정 경계를 찾기 위해 Balancing GAN과 Tomek Links 방법을 결합한 새로운 데이터 증폭 방법을 제안한다. 그리고 제안된 방법을 검증하기 위해 5개의 데이터 세트를 사용하여 분류 모델에 따른 제안 방법의 성능을 평가하고, 데이터 샘플링과 GAN 기반의 데이터 증폭 기법들과의 성능을 비교하였다. 그 결과 총 25개의 성능 평가 중 17개에서 분류 성능이 0.05~0.195 만큼 개선되거나 유지되는 것을 확인하였다. 본 논문에서 제안하는 방법은 불균형 데이터 문제를 해결할 수 있는 새로운 방법으로써의 가능성을 보여주었다.
羅泫植 호남대학교 1992 호남대학교 학술논문집 Vol.13 No.-
This paper described the architectural and operational characteristics of the FDDI(Fiber Distributed Data Interface) communication protocol. And the performance characteristics of FDDI networking is analyzed. The FDDI protocol accepted basically the dual token-ring topology with the optical transmission media. As the FDDI networking uses the TTR(Timed Token Rotation) access method, so it maximized the efficiency of high-speed transmission with 100 Mbps, and enhanced the throughput and real-time characteristics of frame on networking. In order to optimize the performance of the networking using the FDDI protocol, the value of TTRT(Targer Token Rotation Time) which is the core factor of TTR access method must be assigned dynamically in consideration of the constuctual status of computing resources and the factors of networking characteristics.
나현식 湖南大學校 1996 호남대학교 학술논문집 Vol.17 No.2
This paper is an attempt to propose a curriculum model on the education of the information technologies. To derive the adaptive model, the education environments of the computer, information and telecommunication are analyzed through the investigation in Kwangju-Chonnam Area. We expect that this suggested model is a guide to reinforce the information technologies to civilians and to promote the informational policies in the local government.
알쏭이 모자반(Sargassum confusum C. Agardh) 알긴산 분해 조효소 분해물의 알코올 침전에 의한 기호성 증진 효과
나현식,김동현,이하영,유현지,박미성,우가은,조미정,안동현 한국수산과학회 2023 한국수산과학회지 Vol.56 No.2
This study investigated the physicochemical properties and palatability-enhancing effects of the alcohol precipitate, in the enzymatic extracts of Sargassum confusum C. Agardh (SC), obsained using the crude enzyme of Shewanella oneidensis PKA 1008. We analyzed the oligosaccharides recovered from the alcohol precipitate using a thin-layer chromatography for SC-degrading extracts, pH, color, reducing sugar, and viscosity. Thin-layer chromatography showed that after treating with the crude enzyme for 60 h, the polysaccharides were degraded into tetramers, dimers, and trimers and pH increased in the alcohol precipitate (EtOH Sedi). In terms of color, the redness and yellowness of alcohol precipitate/supernatant (EtOH Sedi+Super) and the brightness of EtOH Sedi were the highest among enzyme treated for 0 h and 60 h, EtOH Sedi, and EtOH Sedi+Super. In the reducing sugar analysis, EtOH Sedi showed the lowest value of 13.63 μg/mL, and the lowest viscosity of 1.13. In terms of the sensory evaluation, EtOH Sedi+Super showed the highest value with respect to the overall preference. These results suggest that the crude enzyme of S. oneidensis PKA 1008 is effective at degrading polysaccharides, and its recovery increases the palatability of the alcohol precipitate.