Modification of the Integrated Sasang Constitutional Diagnostic Model

Nam, Jiho,Jang, Jun-Su,Kim, Honggie,Kim, Jong Yeol,Do, Jun-Hyeong Hindawi 2017 Evidence-based Complementary and Alternative Medic Vol.2017 No.-

<P>In 2012, the Korea Institute of Oriental Medicine proposed an objective and comprehensive physical diagnostic model to address quantification problems in the existing Sasang constitutional diagnostic method. However, certain issues have been raised regarding a revision of the proposed diagnostic model. In this paper, we propose various methodological approaches to address the problems of the previous diagnostic model. Firstly, more useful variables are selected in each component. Secondly, the least absolute shrinkage and selection operator is used to reduce multicollinearity without the modification of explanatory variables. Thirdly, proportions of SC types and age are considered to construct individual diagnostic models and classify the training set and the test set for reflecting the characteristics of the entire dataset. Finally, an integrated model is constructed with explanatory variables of individual diagnosis models. The proposed integrated diagnostic model significantly improves the sensitivities for both the male SY type (36.4% → 62.0%) and the female SE type (43.7% → 64.5%), which were areas of limitation of the previous integrated diagnostic model. The ideas of these new algorithms are expected to contribute not only to the scientific development of Sasang constitutional medicine in Korea but also to that of other diagnostic methods for traditional medicine.</P>

폐광산 토양에서 안정화제가 용출 가능한 비소 분획에 미치는 영향

남지호(Jiho Nam),황원재(Seunghun Wonjae Hwang),박민석(Minseok Park),이선경(Sun Kyung Lee),현승훈(Seunghun Hyun) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5

폐광산 토양 내 중금속은 강우에 의해 용출되어 인근 농경지와 하천을 오염시킬 가능성이 있다. 본 연구는 두 종류의 안정화제(산성광산폐수 슬러지(MS) 및 제강슬래그(SS))가 폐광산 토양 내 용출가능 비소(As) 분획(비특이적흡착+특이적흡착) 감소에 미치는 영향을 평가했다. 각 토양은 광산 부지(충청북도 제천) 내 폐석장(WSU)과 폐석장 하단(WSD)에서 채취했으며 두 안정화제를 각각 5 %(w/w)로 처리하여 4주간 30 °C에서 포장용수량의 60 %의 수분 조건을 유지하여 안정화 했다. 안정화 이후 Wenzel 연쇄추출법을 이용해 중금속 결합 특성을 확인하고, 안정화 처리에 따른 통계적 유의성을 검정하였다(ANOVA 검정, 95 % 신뢰도). WSD 토양은 대조군과 대비하여 두 안정화제 처리에 따라 용출가능 분획의 감소가 나타나지 않았다. 반면, WSD 토양은 SS 처리구에서만 용출가능 분획의 농도가 42.1 mg As/kg으로 대조군(48.6 mg As/kg)에 비해 15.2 % 감소했으며, 통계적으로 유의한 차이를 보였다(p <0.05). WSU와 WSD 토양 대조군의 비소 전함량 대비 용출가능 비소 분획의 비율은 각각 2.8 %와 17.8 %으로 WSU 토양의 용출가능 비소 비율이 낮아 안정화제의 효과가 나타나지 않은 것으로 판단된다. 향후 안정화제 처리비율과 안정화기간에 대한 추가 연구를 통해 안정화제를 적용하기 위한 최적 조건 선정 연구가 추가되어야 할 것이다.

Operational Characteristics of a Small-Scale Novel Hybrid Resistive-Type SFCL With Controlled Power Electronics

Nam, Seokho,Lee, Jiho,Lee, Woo Seung,Park, Young Gun,Song, Seunghyun,Jin, Hongwoo,Ko, Tae Kuk Institute of Electrical and Electronics Engineers 2015 IEEE transactions on applied superconductivity Vol.25 No.3

<P>As electric power systems become more complicated, the fault current experiences more frequent changes. To solve this problem, we suggest a novel hybrid-type superconducting fault current limiter (SFCL). Some issues accompany application of resistive-type SFCLs to electric power systems, including initial installation price, operation and maintenance costs, and high-current problems. To overcome these problems, <I>hybrid SFCLs </I> have been developed in some institutions. This paper presents experimental tests of a novel hybrid-type SFCL composed of a resistive superconducting coil, two thyristors, and a control circuit. The superconducting coil limits the first peak of the fault current, and the thyristors control the magnitude of the fault current other than the first peak by adjusting the firing angles. The interactions between the superconducting coil and the thyristors reduce the use of superconducting wire.</P>

Modified Charlson Comorbidity Index as a Pre-Operative Selection Tool for Liver Transplantation in Elderly Patients

( Jiho Choi ),( Youngrok Choi ),( Su Young Hong ),( Sanggyun Suh ),( Kwangpyo Hong ),( Eui Soo Han ),( Jeong-moo Lee ),( Suk Kyun Hong ),( Nam-joon Yi ),( Kwang-woong Lee ),( Kyung-suk Suh ) 대한간학회 2021 춘·추계 학술대회 (KASL) Vol.2021 No.1

A Survey of Automatic Code Generation from Natural Language

( Jiho Shin ),( Jaechang Nam ) 한국정보처리학회 2021 Journal of information processing systems Vol.17 No.3

Many researchers have carried out studies related to programming languages since the beginning of computer science. Besides programming with traditional programming languages (i.e., procedural, object-oriented, functional programming language, etc.), a new paradigm of programming is being carried out. It is programming with natural language. By programming with natural language, we expect that it will free our expressiveness in contrast to programming languages which have strong constraints in syntax. This paper surveys the approaches that generate source code automatically from a natural language description. We also categorize the approaches by their forms of input and output. Finally, we analyze the current trend of approaches and suggest the future direction of this research domain to improve automatic code generation with natural language. From the analysis, we state that researchers should work on customizing language models in the domain of source code and explore better representations of source code such as embedding techniques and pre-trained models which have been proved to work well on natural language processing tasks.

Proof-of-Concept of a Millisecond-Scale Electromagnetic Levitator Using High-Temperature Superconducting Coils

Jiho Lee,Seokho Nam,Seunghyun Song,Hongwoo Jin,Tae Kuk Ko Institute of Electrical and Electronics Engineers 2015 IEEE transactions on applied superconductivity Vol.25 No.3

<P>This paper proposes a millisecond-scale electromagnetic levitator using high-temperature superconducting (HTS) coils. The proposed apparatus consists of an AC power supply, short-circuit switches, an aluminum plate, and two HTS coils. The HTS coils are wound in opposite directions and electrically connected in parallel. Thus, in a symmetric current distribution, the magnetic fluxes generated by the two HTS coils ideally cancel each other. However, in a sudden asymmetric current distribution created by the short-circuit switches, the magnetic fluxes are not cancelled, and the effective magnetic flux induces an eddy current in the aluminum plate placed above the HTS coils. The magnetic flux generated by the eddy current in the aluminum plate and the effective magnetic flux generated by the HTS coils together generate the repulsive force to levitate the aluminum plate. In this paper, numerical calculations and experimental verification of the repulsive force are performed. We show that this apparatus is able to provide a levitation force that we expect will be helpful for devices that need fast switching behavior of the levitation force.</P>

Modified Charlson comorbidity index as a survival prediction tool for older patients after liver transplantation

Jiho Choi*,Eun-Woo Choi*,YoungRok Choi,Su young Hong,Sanggyun Suh,Kwangpyo Hong,Eui Soo Han,Jeong-moo Lee,Suk Kyun Hong,Nam-Joon Yi,Kwang-Woong Lee,Kyung-Suk Suh 대한외과학회 2023 Annals of Surgical Treatment and Research(ASRT) Vol.104 No.6

Purpose: An increasing number of older patients now undergo liver transplantation (LT). Although the overall outcomes in older patients are not different from those of younger patients, there is no tool to predict LT prognosis in older patients. We hypothesized that a modified Charlson comorbidity index (mCCI) and 5-factor modified frailty index (mFI-5) can predict outcomes in older patients after LT. Methods: This retrospective study included 155 patients (aged >65 years) who underwent LT at Seoul National University Hospital. The recipients were subcategorized into 2 groups based on the mCCI score and mFI-5: the low (0–1) and high (2–5) mCCI groups, and low (≤0.4) and high (>0.4) mFI-5 groups. The independent effect of each variable on post-LT survival was determined using the mCCI subgroup, age at transplantation, sex, Child-Turcotte-Pugh score, model for end-stage liver disease (MELD) score, and mFI-5 subgroup. Results: The high-mCCI group (41 patients) showed significantly lower 1- and 3-month and 1-, 3-, and 5-year survival than the low-mCCI group. Using the Cox regression model, the mCCI, sex, and MELD score remained significant. The mFI-5 was not a significant factor to predict patients’ survival. Conclusion: The mCCI and MELD scores could be used to predict post-LT survival in older patients.

Tetrahedral Atom Ordering in a Zeolite Framework: A Key Factor Affecting Its Physicochemical Properties

Shin, Jiho,Bhange, Deu S.,Camblor, Miguel A.,Lee, Yongjae,Kim, Wha Jung,Nam, In-Sik,Hong, Suk Bong American Chemical Society 2011 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.133 No.27

<P>Three gallosilicate natrolites with closely similar chemical composition but differing in the distribution of Si and Ga over crystallographically different tetrahedral sites (T-sites) show striking differences in their cation exchange performance. The ability to exchange Na<SUP>+</SUP> by the larger alkali metal cations decreases upon increasing the size of the cation, as expected, but also with the degree of T-atom ordering. To seek an insight into this phenomenon, the crystal structures of 11 different zeolites, which show variations in degree of T-atom ordering, nature of countercation, and hydration state, have been refined using synchrotron diffraction data. While the three as-made sodium materials were characterized to have a low, medium, and high degree of ordering, respectively, their pore sizes are close to the size of the bare Na<SUP>+</SUP> cation and much smaller than that of the larger alkali cations, which are nonetheless exchanged into the materials, each one at a different level. Interestingly, large differences are also manifested when the Na<SUP>+</SUP> back-exchange is performed on the dehydrated K<SUP>+</SUP> forms, with crystallographic pore sizes too small even to allow the passage of Na<SUP>+</SUP>. Although the thermodynamic data point to small differences in the enthalpy of the Na<SUP>+</SUP>/K<SUP>+</SUP> exchange in the three materials, comparison of the “static” crystallographic pore sizes and the diameter of the exchanged cations lead us to conclude that during the exchange process these zeolites undergo significant deformations that dynamically open the pores, allowing cation traffic even for Cs<SUP>+</SUP> in the case of the most disordered material. In addition to the very large topological flexibility typical of the natrolite framework, we propose as a hypothesis that there is an additional flexibility mechanism that decreases the rigidity of the natrolite chain itself and is dependent on preferential siting of Si or Ga on crystallographically different T-sites.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2011/jacsat.2011.133.issue-27/ja202739j/production/images/medium/ja-2011-02739j_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja202739j'>ACS Electronic Supporting Info</A></P>

Full waveform inversion using a decomposed single frequency component from a spectrogram

Ha, Jiho,Kim, Seongpil,Koo, Namhyung,Kim, Young-Ju,Woo, Nam-Sub,Han, Sang-Mok,Chung, Wookeen,Shin, Sungryul,Shin, Changsoo,Lee, Jaejoon Elsevier 2018 Journal of applied geophysics Vol.153 No.-

<P><B>Abstract</B></P> <P>Although many full waveform inversion methods have been developed to construct velocity models of subsurface, various approaches have been presented to obtain an inversion result with long-wavelength features even though seismic data lacking low-frequency components were used. In this study, a new full waveform inversion algorithm was proposed to recover a long-wavelength velocity model that reflects the inherent characteristics of each frequency component of seismic data using a single-frequency component decomposed from the spectrogram. We utilized the wavelet transform method to obtain the spectrogram, and the decomposed signal from the spectrogram was used as transformed data. The Gauss–Newton method with the diagonal elements of an approximate Hessian matrix was used to update the model parameters at each iteration. Based on the results of time–frequency analysis in the spectrogram, numerical tests with some decomposed frequency components were performed using a modified SEG/EAGE salt dome (A–A′) line to demonstrate the feasibility of the proposed inversion algorithm. This demonstrated that a reasonable inverted velocity model with long-wavelength structures can be obtained using a single frequency component. It was also confirmed that when strong noise occurs in part of the frequency band, it is feasible to obtain a long-wavelength velocity model from the noise data with a frequency component that is less affected by the noise. Finally, it was confirmed that the results obtained from the spectrogram inversion can be used as an initial velocity model in conventional inversion methods.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We proposed the full waveform inversion method using spectral decomposition method. </LI> <LI> The decomposed signal from spectrogram has the reproduced low-frequency components. </LI> <LI> The results show that the inverted velocity models have long-wavelength features. </LI> <LI> The inverted results have different shapes varying with decomposed components. </LI> </UL> </P>

Pressing effect in polymer solar cells with bulk heterojunction nanolayers.

Park, Jiho,Nam, Sungho,Kim, Hwajeong,Kim, Youngkyoo American Scientific Publishers 2011 Journal of nanoscience and nanotechnology Vol.11 No.1

<P>We report the effect of pressing light-absorbing layers on the performance of polymer solar cells. The light-absorbing active layer was prepared on the transparent conducting oxide coated substrates from solutions that contain a mixture of regioregular poly(3-hexylthiophene) and soluble fullerene molecules. The active layers were pressed using a home-built micro-press system by controlling temperature and pressure, followed by the top electrode deposition. The surface of the active layers pressed was examined using atomic force microscope, while the photovoltaic characteristics of devices were measured under simulated solar light illumination (air mass 1.5 G, 100 mW/cm2). Results showed that the dark current of devices was noticeably increased by pressing the active layer without respect to the pressing temperature. The highest power conversion efficiency was achieved for the device with the active layer pressed under 10 kgf at 70 degrees C. The result was explained in terms of surface morphology and thermophysical effect.</P>