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Jaedeok Seo,Wonjung Kim,Jeongsu Lee 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.25 No.4
The acquisition of properly labeled datasets is challenging, which hampers the implementation of industrial deep learning technology in actual manufacturing sites. This paper proposes an unsupervised manufacturing fault detection method based on self-labeled training to remedy the lack of properly labeled datasets. The proposed method comprises a two-step process of time-series imaging, termed fingerprinting, and normality calculation using self-labeled classification in a deep learning architecture. We compared our model with state-of-art one-class classification algorithms using an unlabeled dataset, which was obtained by varying the ratio of production failure samples in datasets. The proposed model exhibited better performance than baseline algorithms in terms of area under receiver operating curve (AUROC), even for the one-class classification using datasets comprising production success cases only. Moreover, more robust performance was observed compared to the baseline algorithms in several contamination conditions of datasets where the datasets comprised different proportions of production failure cases to simulate unlabeled manufacturing data. Our results suggest that the self-labeling-based fault detection model we propose is adaptable to both unsupervised and semi-supervised conditions. It can effectively enhance the detection of defects in scenarios characterized by exceptionally rare failure cases that closely resemble real-world situations.
종이의 액체 흡수 시 셀룰로오스 섬유 내부 공극의 영향
서재덕(Jaedeok Seo),장수영(Sooyoung Chang),홍석빈(Seokbin Hong),이덕규(Duck-Gyu Lee),김원정(Wonjung Kim) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
The accurate control of liquid imbibition in paper is crucial for the applications of paper to microfluidic devices. However, the classical model for capillary flow in porous media, Washburn law, has limitations in predicting the flow in a complex fiber network such as paper. Although various physical explanations for the limitations have been suggested, we here newly report that intra-fiber pores of cellulose fibers are mainly responsible for the limited accuracy of Washburn law. Our experimental study shows that liquid may imbibe through the intra-fiber pores in cellulose fibers as well as through the inter-fiber pores formed by fiber network. We theoretically developed a hydrodynamic model for liquid imbibition through paper with the consideration of intra-fiber pores. Our theoretical predictions show a good agreement with the experimental observations, leading to the physical reasons behind the limits of Washburn law.
하이드로젤에 의해 구동되는 종이 미세 유체 장치 용 펌프
서재덕(Jaedeok Seo),김원정(Wonjung Kim) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
As paper-based microfluidic devices become diverse and used for detailed diagnostics, developers are making efforts to increase and control the flow in paper. The flow in the paper is the capillary flow described by the Washburn’s equation. The flow is determined by the size of pore and the properties of the working fluid. In order to generate a flowrate over this capillary flow, a high pressure is required to overcome the viscous resistance produced by the small size paper pore. We have used hydrogel as an energy source to create this high pressure. Hydrogels have the ability to absorb more than 100 times their volume of water and are already being applied in a variety of industrial and environmental applications. We have succeeded in producing a large negative pressure by creating a structure that maximizes the ability of the hydrogel to absorb water. We have developed a non-powered pump that can be used in paper-based devices using hydrogels. The pump can generate more than 20 times higher flowrate than the capillary flow in paper channel for more than 4 hours.
증기 압축식 냉동 시스템 내 과냉 온도조건에서 R600a의 비평형 이상유동
고재덕(Jaedeok Ko),서준영(Joon-Yong Seo),이원종(Won-Jong Lee),정지환(Ji Hwan Jeong) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.11
A vapor compression refrigeration system is typically designed such that the refrigerant reaches a subcooled liquid state at the condenser outlet. In this study, a series of experiments are conducted to investigate the refrigerant state between at the condenser outlet and the capillary tube inlet. The experimental apparatus equipped with thermocouples, pressure measurements and visualization device was installed and operated with R600a as a refrigerant. The visual observations, as well as temperature and pressure measurements, demonstrate that R600a flows in a non-equilibrium two-phase state at highly subcooled temperature condition. Furthermore, a set of equations is proposed for calculating the specific enthalpy of the refrigerant in a non-equilibrium two-phase state, and this proposed method is verified using experimental measurements. It is found that the thermodynamic property table does not provide an appropriate value of specific enthalpy in non-equilibrium conditions, while the enthalpy calculation method proposed in this study is in excellent agreement with the experimentally measured values.
Virus Incidence of Sweet Potato in Korea from 2011 to 2014
Kim, Jaedeok,Yang, Jung wook,Kwak, Hae-Ryun,Kim, Mi-Kyeong,Seo, Jang-Kyun,Chung, Mi-Nam,Lee, Hyeong-un,Lee, Kyeong-Bo,Nam, Sang Sik,Kim, Chang-Seok,Lee, Gwan-Seok,Kim, Jeong-Soo,Lee, Sukchan,Choi, Hon The Korean Society of Plant Pathology 2017 Plant Pathology Journal Vol.33 No.5
A nationwide survey was performed to investigate the current incidence of viral diseases in Korean sweet potatoes for germplasm and growing fields from 2011 to 2014. A total of 83.8% of the germplasm in Korea was infected with viruses in 2011. Commercial cultivars that were used to supply growing fields were infected at a rate of 62.1% in 2012. Among surveyed viruses, the incidence of five Potyvirus species that infect sweet potato decreased between 2012 and 2013, and then increased again in 2014. Representatively, the incidence of Sweet potato feathery mottle virus (SPFMV) was 87.0% in 2012, 20.7% in 2013 and then increased to 35.3% in 2014. Unlike RNA viruses, DNA viruses were shown to decrease continuously. The incidence of Sweet potato leaf curl virus (SPLCV) was 5.5% in 2003, 59.5% in 2011, and 47.4% in 2012. It then decreased continuously year by year to 33.2% in 2013, and then 25.6% in 2014. While the infection rate of each virus species showed a tendency to decline, the virus infection status was more variable in 2013 and 2014. Nevertheless, the high rate of single infections and mixed infection combinations were more variable than the survey results from 2012. As shown in the results from 2013, the most prevalent virus infection was a single infection at 27.6%, with the highest rate of infection belonging to sweet potato symptomless virus-1 (SPSMV-1) (12.9%). Compared to 2013, infection combinations were more varied in 2014, with a total of 122 kinds of mixed infection.
Hae-Ryun Kwak,Jaedeok Kim,Mikyeong Kim,Jang-Kyun Seo,Jeong-Soo Kim,Hong-Soo Choi 한국식물병리학회 2018 Plant Pathology Journal Vol.34 No.5
The Sweet potato chlorotic fleck virus (SPCFV), of the genus Carlavirus (family Betaflexiviridae), was first detected as one of several viruses infecting sweet potatoes (Ipomea batatas L.) in Korea. Out of 154 sweet potato samples collected in 2012 that were showing virus-like symptoms, 47 (31%) were infected with SPCFV, along with other viruses. The complete genome sequences of four SPCFV isolates were determined and analyzed using previously reported genome sequences. The complete genomes were found to contain 9,104-9,108 nucleotides, excluding the poly-A tail, containing six putative open reading frames (ORFs). Further, the SPCFV Korean isolates were divided into two groups (Group I and Group II) by phylogenetic analysis based on the complete nucleotide sequences; Group I and Group II had low nucleotide sequence identities of about 73%. For the first time, we determined the complete genome sequence for the Group II SPCFV isolates. The amino acid sequence identity in coat proteins (CP) between the two groups was over 90%, whereas the amino acid sequence identity in other proteins was less than 80%. In addition, SPCFV Korean isolates had a low amino acid sequence identity (61% CPs and 47% in the nucleotide- binding protein [NaBp] region) to that of Melon yellowing-associated virus (MYaV), a typical Carlavirus.
실시간 데이터 분석을 위한 컨테이너 기반 가상화 성능에 관한 연구
최보아 ( Boah Choi ),한재덕 ( Jaedeok Han ),오다솜 ( Dasom Oh ),박현국 ( Hyunkook Park ),김현아 ( Hyeona Kim ),서민관 ( Minkwan Seo ),이종혁 ( Jonghyuk Lee ) 한국정보처리학회 2020 한국정보처리학회 학술대회논문집 Vol.27 No.1
본 논문은 실시간 데이터 분석을 위한 컨테이너 가상화 기술 사용에 대한 효용성을 알아보기 위해 HDP 와 MapR 배포판에 포함된 Spark 를 도커라이징 전과 후 환경에 설치 후 HiBench 벤치마크 프로그램을 이용해 성능을 측정하였다. 그리고 성능 측정치에 대해 대응표본 t 검정을 이용하여 도커라이징 전과 후의 성능 차이가 있는지를 통계적으로 분석하였다. 분석 결과, HDP 는 도커라이징 전과 후에 대한 성능 차이가 있었지만 MapR 은 성능 차이가 없었다.
Kwak, Hae-Ryun,Kim, Jaedeok,Kim, Mi-Kyeong,Seo, Jang-Kyun,Jung, Mi-Nam,Kim, Jeong-Soo,Lee, Sukchan,Choi, Hong-Soo The Korean Society of Plant Pathology 2015 Plant Pathology Journal Vol.31 No.4
Sweet potatoes (Ipomea batatas L.) are grown extensively, in tropical and temperate regions, and are important food crops worldwide. In Korea, potyviruses, including Sweet potato feathery mottle virus (SPFMV), Sweet potato virus C (SPVC), Sweet potato virus G (SPVG), Sweet potato virus 2 (SPV2), and Sweet potato latent virus (SPLV), have been detected in sweet potato fields at a high (~95%) incidence. In the present work, complete genome sequences of 18 isolates, representing the five potyviruses mentioned above, were compared with previously reported genome sequences. The complete genomes consisted of 10,081 to 10,830 nucleotides, excluding the poly-A tails. Their genomic organizations were typical of the Potyvirus genus, including one target open reading frame coding for a putative polyprotein. Based on phylogenetic analyses and sequence comparisons, the Korean SPFMV isolates belonged to the strains RC and O with >98% nucleotide sequence identity. Korean SPVC isolates had 99% identity to the Japanese isolate SPVC-Bungo and 70% identity to the SPFMV isolates. The Korean SPVG isolates showed 99% identity to the three previously reported SPVG isolates. Korean SPV2 isolates had 97% identity to the SPV2 GWB-2 isolate from the USA. Korean SPLV isolates had a relatively low (88%) nucleotide sequence identity with the Taiwanese SPLV-TW isolates, and they were phylogenetically distantly related to SPFMV isolates. Recombination analysis revealed that possible recombination events occurred in the P1, HC-Pro and NIa-NIb regions of SPFMV and SPLV isolates and these regions were identified as hotspots for recombination in the sweet potato potyviruses.