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>

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.

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

HSB800 고강도 강재 적용 연속 I-거더교의 가능 및 필요 회전 변형 능력

문지호(Jiho Moon),주현성(Hyun Sung Joo),임남형(Nam Hyung Lim),이학은(Hak Eun Lee) 한국강구조학회 2013 韓國鋼構造學會誌 Vol.25 No.5

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>

감사인 강제교체에 대해 시장은 어떻게 반응하는가?: 주가붕괴위험을 중심으로

황지회 ( Jihoe Hwang ),남기만 ( Giman Nam ),이재형 ( Jaehyoung Lee ) 한국회계학회 2021 회계저널 Vol.30 No.4

2017년에 개정된 ‘주식회사 등의 외부감사에 관한 법률’(이하 외감법)에서는 6년 연속 동일 감사인에게 감사를 받은 상장회사는 감사인을 교체하여, 새로운 감사인에게 3년 동안 외부감사를 받도록 의무화하는 주기적 지정제를 도입하였다. 강제교체와 관련한 선행 연구에서 강제교체가 감사품질에 미치는 영향에 대해 일관된 결과를 보여주지 못하고 있는 상황에서, 과거에도 한차례 도입되었다 폐지된 강제교체제도를 재도입하는 것은 논란의 여지가 있다. 또한 과거 감사인 강제교체와 감사품질에 대한 선행연구가 재무보고의 품질을 바탕으로 한 전문성과 실질적 독립성 측면의 연구가 대부분이고, 시장에서 투자자가 인지하는 독립성 측면에서의 연구는 부족한 상황이다. 이에 따라 본 연구에서는 감사인 강제교체제도의 도입이 주가붕괴위험을 낮출 수 있는지 분석함으로써 감사인 강제교체제도에 대한 시장의 반응을 확인하고자 한다. 이를 위해 감사인 강제교체제도가 적용된 2006년부터 2010년까지의 상장기업을 대상으로 감사인이 강제교체된 기업과 그렇지 않은 기업, 그리고 감사인이 강제교체된 기업의 강제교체 전후 기간의 주가붕괴위험을 비교분석하였다. 분석결과, 강제교체된 감사인에게 감사받은 기업은 그렇지 않은 기업에 비해 주가붕괴위험이 유의하게 낮은 것으로 나타났다. 그리고 감사인이 강제교체된 기업만을 대상으로 강제교체 전후를 비교한 결과, 강제교체된 감사인에게 감사받은 기간은 강제교체 전에 비하여 주가 붕괴위험이 유의하게 낮은 것으로 나타났다. 이는 감사인의 강제교체로 독립성이 강화되어 나타난 결과라 할 수 있다. 즉, 감사인 강제교체로 인한 독립성 강화로 경영자가 부정적인 정보를 은폐할 가능성을 낮추고, 정보이용자의 재무제표에 대한 신뢰성을 제고하여 주가붕괴위험이 낮아진 것으로 해석 가능하다. 본 연구의 결과는 과거의 감사인 강제교체제도와 맥을 같이 하는 감사인 주기적 지정제가 시행되고 있는 현 시점에서 해당 제도의 실효성을 예측해볼 수 있는 유의미한 자료가 될 수 있을 것으로 기대한다. The revision of the “Act on External Audit of Stock Companies” in 2017 re-introduced the 6-year mandatory audit firm rotation rule called by the periodic auditor designation policy. The new policy differs in that the new audit firm is chosen not by the audited firm but by regulators. However, as the effect of the 6-year mandatory audit firm rotation rule on audit quality has not been consistent in prior studies, the reintroduction of the previously abolished policy is controversial. Although most prior studies examine the effect of mandatory audit firm rotation on audit quality or independence-in-fact using discretionary accruals, studies on independence-in- appearance perceived by investors in the capital market are insufficient. This paper examines the relationship between mandatory audit firm rotation rule and stock price crash risk using 574 mandatory auditor change firms from 2006 to 2010. Specifically, we examine the differences in stock price crash risk between mandatory auditor changed firms and the other firms, and the differences in stock price crash risk of mandatory auditor changed firms before and after the mandatory auditor change. First, we find that the stock price crash risk of mandatory auditor change firms is lower than that of the other firms. Second, we also find that the stock price crash risk of mandatory auditor changed firms decreased from pre to post mandatory auditor change. Our study has important policy implications for regulators.