http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Socioeconomic Status and Number of Children Among Korean Women: The Healthy Twin Study
Kim, Jinseob,Sung, Joohon The Korean Society for Preventive Medicine 2013 Journal of Preventive Medicine and Public Health Vol.46 No.1
Objectives: This study aimed to evaluate whether the birth rate is associated with socioeconomic status in the women of the Republic of Korea, where the birth rate is rapidly decreasing. Methods: This study included 732 females from the Healthy Twin Study, a family-twin cohort. The participants were classified into 3 socioeconomic groups according to their average income, education, and occupation. The association between socioeconomic status and number of children was assessed using gamma regression analysis with a generalized linear mixed model, adjusting for the age group, smoking/alcohol status, and family relationships. Results: The group with the highest education level had significantly fewer children compared with the group with the lowest education level (p=0.004). However, no significant associations were found according to household income level. The non-manual labor group had significantly fewer children compared with those working as homemakers (p=0.008). Conclusions: This study aimed to explain the causal relationship between socioeconomic status and number of children. Associations between some socioeconomic status and number of children were found in Korea.
Jinseob Kim,Juhwan Kim,Jeongkyun Na,Yoonchan Jeong 한국광학회 2018 Current Optics and Photonics Vol.2 No.2
We propose a novel bi-focal metallic Fresnel zone plate (MFZP) with shallow depth-of-field (DOF) characteristics. We design the specific annular slit patterns, exploiting the phase-selection-rule method along with the particle swarm optimization algorithm, which we have recently proposed. We numerically investigate the novel characteristics of the bi-focal MFZP in comparison with those of another bi-focal MFZP having equivalent functionality but designed by the conventional multi-zone method. We verify that whilst both bi-focal MFZPs can produce dual focal spots at 15 μm and 25 μm away from the MFZP plane, the former exhibits characteristics superior to those of the latter from the viewpoint of axial resolution, including the axial side lobe suppression and axial DOF shallowness. We expect the proposed bi-focal MFZP can readily be fabricated with electron-beam evaporation and focused-ion-beam processes and further be exploited for various applications, such as laser micro-machining, optical trapping, biochemical sensing, confocal sensing, etc.
Kim, Hyuntai,Lee, Seung-Yeol,Koo, Sukmo,Kim, Jinseob,Park, Kyoungyoon,Lee, Dongyeul,Vazquez-Zuniga, Luis Alonso,Park, Namkyoo,Lee, Byoungho,Jeong, Yoonchan Optical Society of America 2014 Optics express Vol.22 No.22
<P>We propose a novel trench-assisted circular metal nano-slit (CMNS) structure implementable on a fiber platform for the generation of a low-noise cylindrical surface plasmon (CSP) hotspot. We design trench structures based on a multi-pole cancellation method in order that a converging surface plasmon signal is well separated from co-propagating non-confined diffracted light (NCDL) at the hotspot location. In fact, the secondary radiation by the quasi-pole oscillation at the edge of the trench cancels the primary NCDL, thereby enhancing the signal-to-noise ratio (SNR) of the CSP hotspot. In particular, we investigate two types of trench structures: a rectangular-trench (RT) structure and an asymmetric-parabolic-trench (APT) structure, which are considered for the sake of the simplicity of fabrication and of the maximal enhancement of the SNR, respectively. In comparison with a conventional CMNS having no trenches, we highlight that the mean SNR of the CSP hotspot is enhanced by 6.97 and 11.89 dB in case of the optimized RT and APT CMNSs, respectively. The proposed schemes are expected to be useful for increasing the SNR of plasmonic devices that are interfered by NCDL, such as various types of nano-slits for generating high-resolution plasmonic signals, for example.</P>
Sorption of Organic Complexing Agents to Engineering Barriers of a Radioactive Waste Disposal Site
Jinseob Kim,Ahsan Abdul Ghani,Bolam Kim,Youngsu Lim,Dae Sung Lee 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.2
Organic complexing agents may affect the mobility of radionuclides at low- and intermediate-level radioactive waste repositories. Especially, isosaccharinic acid (ISA) is the main cellulose degradation product under high pH conditions in cement pore water. ISA can combine with radionuclides and form stable complexes that adversely influence adsorption in the concrete phase, resulting in radionuclides to leach to the near- and far-fields of repositories. This study focuses on investigating the sorption of ISA onto engineered barriers such as concrete, thereby studying adsorption isotherms of ISA on concrete and comparing various isotherm models with the experimental data. The adsorption experiment was conducted in three background solutions, groundwater (adjusted to pH 13 using NaOH), State 1 (artificial cement pore water, pH 13.3), and State 2 (artificial cement pore water, pH 12.5), in a batch system at a temperature of 20°C. Concrete was characterized using BET, Zeta-potential analyzer, XRD, XRF, and SEM-EDS. ISA concentrations were detected using HPLC. The experimental data were best fitted to one-site Langmuir isotherm; On the other hand, either two-site isotherm or Freundlich isotherm couldn’t give reasonable fitting to the experimental data. The observed ISA sorption behavior on concrete is crucial for the disposal of radioactive waste because it can significantly lower the concentration of ISA in the pore water. Although one-site Langmuir isotherm might effectively represent the sorption behavior of ISA on concrete, the underlying mechanism is still unknown, and further investigation should be done in the near future.
시계열 분해 데이터를 이용한 LSTM 기법 기반 항공기 수리부속 수요예측 방안 연구
김진섭(Jinseob Kim),황재성(Jaesung Hwang),정재우(Jaewoo Chung) 한국경영과학회 2020 經營 科學 Vol.37 No.2
This paper proposes a new deep learning method called H-LSTM (Hybrid Long and Short Term Memory) in order to improve the demand forecasting system of spare parts for ROKAF (Republic of Korea Air Force) aircraft ‘B’. The existing LSTM has been popularly utilized for forecasting stock price or energy demand since it was known to be appropriate for non-linear time series data forecast. This paper applies the H-LSTM for a demand forecast problem of aircraft spare parts, which shows irregular demand patterns. The H-LSTM that combines the existing LSTM model with time series analysis after the seasonality and trend of demand data are decomposed. Based on a preliminary analysis, the Aircraft spare parts demand pattern shows irregularity as Erratic, Lumpy items of irregular demand characteristics take relatively higher percentages. The accuracy of the new method compared with existing stochastic methods show a higher forecast accuracy than ARIMA or Holt Winters. Therefore, if it is applied for the demand forecast system of ROKAF aircraft spare parts, the H-LSTM is expected to not only improve demand forecast accuracy, but also increase aircraft availability and curtail inventory cost through decreasing unnecessary parts stocks. This paper is meaningful in that it is the very first study to offer a working-level improvement resolution in demand forecast through the LSTM, a type of deep learning, by utilizing ROKAF’s practical logistics data.
Bolam Kim,Gi-Taek Oh,Youngsu Lim,Jinseob Kim,Juhui Park,Seongju Lee,Jiseon Jang,Seho Choi,Myunggoo Kang,Jaechul Ha,Chun-Hyung Cho,Min-Woo Lee,Dae Sung Lee 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.1
The organic complexing agents such as ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), and isosaccharinic acid (ISA) can enhance the radionuclides’ solubility and have the potential to induce the acceleration of radionuclides’ mobility to a far-field from the radioactive waste repository. Hence, it is essential to evaluate the effect of organic complexing agents on radionuclide solubility through experimental analysis under similar conditions to those at the radioactive waste disposal site. In this study, five radionuclides (cesium, cobalt, strontium, iodine, and uranium) and three organic complexing agents (EDTA, NTA, and ISA) were selected as model substances. To simulate environmental conditions, the groundwater was collected near the repository and applied for solubility experiments. The solubility experiments were carried out under various ranges of pHs (7, 9, 11, and 13), temperatures (10°C, 20°C, and 40°C), and concentrations of organic complexing agents (0, 10-5, 10-4, 10-3, and 10-2 M). Experimental results showed that the presence of organic complexing agents significantly increased the solubility of the radionuclides. Cobalt and strontium had high solubility enhancement factors, even at low concentrations of organic complexing agents. We also developed a support vector machine (SVM) model using some of the experimental data and validated it using the rest of the solubility data. The root mean square error (RMSE) in the training and validation sets was 0.012 and 0.016, respectively. The SVM model allowed us to estimate the solubility value under untested conditions (e.g., pH 12, temperature 30°C, ISA 5×10-4 M). Therefore, our experimental solubility data and the SVM model can be used to predict radionuclide solubility and solubility enhancement by organic complexing agents under various conditions.