Bi-factor MIRT True-Score Equating for Testlet-Based Tests

이규민(Gue min Lee),Won Chan Lee,Michael J Kolen,박인용(In Yong Park),Dong In Kim,Ji Seung Yang 한국교육평가학회 2015 교육평가연구 Vol.28 No.2

Lee and Lee (2014) proposed bi-factor multidimensional item response theory model (BFM) "observed-score" equating procedures. The main purposes of this study were to develop BFM "true-score" equating procedures, and to investigate applicability of the proposed procedures with actual data. Eight equating methods (including both true- and observed-score) based on dichotomous IRT (2-parameter logistic model: 2PL), polytomous IRT (graded response model: GRM), testlet response model (TRM), and BFM were compared with target equipercentile equating. Data for this study were from the Reading Comprehension test for a large-scale state assessment program, which consisted of several passages and corresponding groups of items. True- and observed-score equating methods based upon 2PL and BFM produced similar equating results. The GRM true- and observed-score equating methods provided equating results somewhat different from others, and more similar to the target equipercentile equating. Lee와 Lee(2014) 연구는 혼합형 검사에서의 bi-factor 다차원 문항반응모형을 적용한 IRT "관찰점수" 동등화 절차를 제안하였다. 이 연구는 Lee와 Lee(2014) 연구의 추수연구로 단위검사를 대상으로 bi-factor 다차원 문항반응모형을 적용한 IRT "진점수" 동등화 절차를 제안하고, 그 적용 가능성을 실제 자료를 이용하여 탐색하고자 하였다. 이를 위해 단위검사로 구성된 대규모 독해 검사 자료를 이용하여, 2모수 로지스틱 모형(2-parameter logistic model: 2PL), 등급반응모형(graded response model: GRM), 단위검사모형(testlet response model: TRM), bi-factor 모형(bi-factor model: BFM)을 적용하였으며, 관찰점수 및 진점수 동등화를 시행하여 총 8개의 동등화 방법을 적용하고, 산출된 결과를 동백분위 동등화 결과와 비교하였다. 연구 결과, 2PL과 BFM을 적용한 관찰점수 및 진점수 동등화는 유사한 결과를 산출하였으며, GRM을 적용한 관찰점수 및 진점수 동등화 방법은 다른 방법들과 다소 차이를 보이는 결과를 산출하였고, 비교 기준이 된 동백분위 동등화 결과와 보다 유사한 결과를 보였다.

Mass Spectrometry Based Profiling and Imaging of Various Ginsenosides from <i>Panax ginseng</i> Roots at Different Ages

Lee, Jae Won,Ji, Seung-Heon,Lee, Young-Seob,Choi, Doo Jin,Choi, Bo-Ram,Kim, Geum-Soog,Baek, Nam-In,Lee, Dae Young MDPI 2017 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.18 No.6

<P>(1) Background: <I>Panax ginseng</I> root is one of the most important herbal products, and the profiling of ginsenosides is critical for the quality control of ginseng roots at different ages in the herbal markets. Furthermore, interest in assessing the contents as well as the localization of biological compounds has been growing. The objective of this study is to carry out the mass spectrometry (MS)-based profiling and imaging of ginsenosides to assess ginseng roots at different ages; (2) Methods: Optimal ultra performance liquid chromatography coupled to quadrupole time of flight/MS (UPLC-QTOF/MS) was used to profile various ginsenosides from <I>P. ginseng</I> roots. Matrix-assisted laser desorption ionization (MALDI)-time of flight (TOF)/MS-based imaging was also optimized to visualize ginsenosides in ginseng roots; (3) Results: UPLC-QTOF/MS was used to profile 30 ginsenosides with high mass accuracy, with an in-house library constructed for the fast and exact identification of ginsenosides. Using this method, the levels of 14 ginsenosides were assessed in <I>P. ginseng</I> roots cultivated for 4, 5, and 6 years. The optimal MALDI-imaging MS (IMS) was also applied to visualize the 14 ginsenosides in ginseng roots. As a result, the MSI cross sections showed the localization of 4 ginsenoside ions ([M + K]<SUP>+</SUP>) in <I>P. ginseng</I> roots at different ages; (4) Conclusions: The contents and localization of various ginsenosides differ depending on the cultivation years of <I>P. ginseng</I> roots. Furthermore, this study demonstrated the utility of MS-based profiling and imaging of ginsenosides for the quality control of ginseng roots.</P>

Effects of Herbal treatment for In-patients with Mild Fever: Retrospective Clinical Study

Lee, Sun-Ju,Han, In-Sik,Oh, Hyun-Suk,Lee, Dong-Jin,Yoon, Jeung-Won,Choi, Ga-Young,Hong, Sun-Gi,Lee, Won-Chul,Sun, Seung-Ho The Society of Korean Medicine 2011 대한한의학회지 Vol.32 No.6

Objectives: This study was designed to investigate the effect of herbal extract medicines for inpatients with fever symptoms in an oriental medicine hospital. Methods: Medical records of inpatients who experienced over $38^{\circ}C$ of fever from July 2010 to August 2011 has been requested with deleted personal identifiable information. The requested data were analyzed by patients' general characteristics, administrated western/herbal medicines, and changes in the body temperature of four administration groups (group 1, herbal extract medicine only; group 2, western medication(antibiotics/antipyretics) only; group 3, combination of herbal extract medicine and western medication; group 4, no medication control). The SPSS 19.0 was used for statistical analysis and p-value of less than 0.05 was regarded significant. Results: The body temperature has significantly dropped over time in the herbal extract medicine only group (p<0.001) along with the antibiotics/antipyretics only group. When both treatments were combined, stronger antipyretic effect was shown compared to the sole treatment of herbal extract medicine or antibiotics/antipyretics. Conclusion: The use of herbal extract medicines may be effective in alleviation of fever.

Probing the Issue of Informed Consent in Health Care in Korea―Concept Analysis and Guideline Development

Won-Hee Lee,In-Sook Kim,Byung-Hye Kong,Sue Kim,Sunhee Lee 한국간호과학회 2008 Asian Nursing Research Vol.2 No.2

Purpose The purpose of the study was to identify how informed consent is conceptualized by patients, family members, physicians, and nurses in Korea, and to develop guidelines for clinical practice in Korea. Methods This study employed the hybrid model to define the concept of informed consent through theoretical and fieldwork phases. For the theoretical phase, attributes of informed consent were identified through a review of the literature, and in-depth interviews were conducted for the fieldwork phase to develop attributes from the data and to verify the attributes identified from the literature review. Purposive sampling was done for 48 participants (12 patients, 12 family members, 12 physicians, 12 nurses), who were interviewed from selected units (orthopedics, cardiothoracic surgery, obstetrics/gynecology) from two university hospitals in Seoul and Kwangju, Korea. Attributes and processing issues of informed consent were extracted from both phases. Results Core attributes of informed consent include the patient’s self-directed decision-making, fulfillment of legal responsibility, focusing on forging a trusting relationship, assuming active responsibility for explanations (physicians) and granting consent (patient), factors related to sufficient explanation, and the role of family. Findings were integrated into a set of guidelines for patients and family and health care professionals. Conclusion The guidelines developed in the present study offer empirical parameters for an effective process of obtaining informed consent in Korea by seeking to decrease the gap in perceptions of informed consent among patients, family members, physicians, and nurses. The importance of advocating patients and developing a trusting relationship between health care providers and patients is especially noteworthy. [Asian Nursing Research 2008;2(2):102–112] Purpose The purpose of the study was to identify how informed consent is conceptualized by patients, family members, physicians, and nurses in Korea, and to develop guidelines for clinical practice in Korea. Methods This study employed the hybrid model to define the concept of informed consent through theoretical and fieldwork phases. For the theoretical phase, attributes of informed consent were identified through a review of the literature, and in-depth interviews were conducted for the fieldwork phase to develop attributes from the data and to verify the attributes identified from the literature review. Purposive sampling was done for 48 participants (12 patients, 12 family members, 12 physicians, 12 nurses), who were interviewed from selected units (orthopedics, cardiothoracic surgery, obstetrics/gynecology) from two university hospitals in Seoul and Kwangju, Korea. Attributes and processing issues of informed consent were extracted from both phases. Results Core attributes of informed consent include the patient’s self-directed decision-making, fulfillment of legal responsibility, focusing on forging a trusting relationship, assuming active responsibility for explanations (physicians) and granting consent (patient), factors related to sufficient explanation, and the role of family. Findings were integrated into a set of guidelines for patients and family and health care professionals. Conclusion The guidelines developed in the present study offer empirical parameters for an effective process of obtaining informed consent in Korea by seeking to decrease the gap in perceptions of informed consent among patients, family members, physicians, and nurses. The importance of advocating patients and developing a trusting relationship between health care providers and patients is especially noteworthy. [Asian Nursing Research 2008;2(2):102–112]

In-line 마그네트론 스퍼터 장치를 사용하여 산소 분위기에서 제작한 Ag 박막의 특성

구대영,김원목,조상무,황만수,이인규,정병기,이택성,이경석,조성훈,Ku, Dae-Young,Kim, Won-Mok,Cho, Sang-Moo,Hwang, Man-Soo,Lee, In-Kyu,Cheong, Byung-Ki,Lee, Taek-Sung,Lee, Kyeong-Seok,Cho, Sung-Hun 한국재료학회 2002 한국재료학회지 Vol.12 No.8

A study was made to examine the electrical, compositional, structural and morphological properties of Ag thin films deposited by DC magnetron sputtering in $O_2$ atmosphere with deposition temperature from room temperature to 15$0^{\circ}C$ using in-line sputter system. The Ag films deposited at temperature above $100^{\circ}C$ in oxygen atmosphere gave a similar specific resistivity to and even lower oxygen content than those deposited using pure Ar sputter gas The Ag films deposited with pure Ar gas was mainly composed of crystallites with [111] preferred orientation, while, for those deposited in oxygen atmosphere, more than 50% of the volume was composed of crystallites with [100] orientation. The difference in the micro structure did not cause any difference in the specific resistivity of Ag films. The results showed that the transparent conducting oxide films and the Ag films could be processed sequentially in the same deposition chamber with careful control of deposition temperature, which might result in a cost reduction for constructing the large scale in-line deposition system.

Comprehensive Evaluation of the NeoBase 2 Non-derivatized MSMS Assay and Exploration of Analytes With Significantly Different Concentrations Between Term and Preterm Neonates

Lee Beomki,Heo Won Young,Kim Jee Ah,Lee Hyun-Seung,Hwang Narae,Park Hyung-Doo,Sung Se In,Chang Yun Sil,Park Won Soon,Lee Soo-Youn 대한진단검사의학회 2023 Annals of Laboratory Medicine Vol.43 No.2

Background: Despite the popularity of the NeoBase 2 Non-derivatized MSMS assay (PerkinElmer, Turku, Finland), there are no reports of its comprehensive evaluation, including the ability to distinguish transient tyrosinemia of the newborn (TTN) from tyrosinemia type 1 (TYR 1) using succinylacetone (SUAC). No newborn screening (NBS) cutoffs for preterm neonates in the Korean population have been suggested. We evaluated the NeoBase 2 assay and identified analytes requiring different cutoffs in preterm neonates. Methods: Residual NBS dried blood spot samples and proficiency testing (PT) materials of the Newborn Screening Quality Assurance Program and the Korean Association of External Quality Assessment Service were used. Precision, accuracy, limit of detection (LOD), lower limit of quantification (LLOQ), linearity, recovery, carryover, and performance of SUAC were evaluated. Cutoffs were determined, and analytes requiring different cutoffs in preterm neonates were investigated. Results: Mean CVs for within-run and between-day precision were within 15%. Accuracy analysis indicated high agreement with in-house derivatized assay results and results of other PT participants. All analytes demonstrated acceptable LOD, LLOQ, and linearity. Recoveries were acceptable, except for SUAC. Carryover was negligible. Cutoffs were established for all analytes; Tyr, adenosine, and C20:0-lysophosphatidylcholine required different cutoffs in preterm neonates. Differential diagnosis of TYR 1 and TTN was successful with simultaneous Tyr and SUAC measurement. Conclusions: The NeoBase 2 assay demonstrated satisfactory performance. The additional analytes provide a wider diagnostic coverage, and the simultaneous measurement of Tyr and SUAC is efficient in excluding TYR 1. The new cutoffs for preterm neonates may decrease false-positive rates, without compromising diagnostic sensitivity.

<i>In vitro</i> and <i>in vivo</i> evaluation of a novel polymer-free everolimus-eluting stent by nitrogen-doped titanium dioxide film deposition

Park, Dae Sung,Bae, In-Ho,Jeong, Myung Ho,Lim, Kyung Seob,Sim, Doo Sun,Hong, Young Joon,Lee, So-Youn,Jang, Eun Jae,Shim, Jae-Won,Park, Jun-Kyu,Lim, Han Chul,Kim, Han Byul Elsevier 2018 Materials Science and Engineering C Vol.91 No.-

<P><B>Abstract</B></P> <P>Inflammation and thrombosis are linked to the use of polymer-based drug-eluting stents (DES). The aim of this study was to develop a polymer-free everolimus (EVL)-eluting stent using nitrogen-doped titanium dioxide (N-TiO<SUB>2</SUB>) and verify its efficacy by <I>in vitro</I> and <I>in vivo</I> assessment in a porcine coronary model. Various analytical approaches such as scanning electron microscopy and atomic force microscopy, electron spectroscopy, Fourier transform infrared spectrometry and contact angle measurement were employed for the characterization. As a part of biocompatibility assessment, platelet adhesion and smooth muscle cell (SMC) proliferation were examined. Bare metal stent (BMS), N-TiO<SUB>2</SUB> stent, everolimus-eluting N-TiO<SUB>2</SUB> (N-TiO<SUB>2</SUB>-EVL) stent, and commercialized EVL-eluting stent (EES) were randomly placed in forty coronary arteries in twenty pigs. After four weeks of implantation, the stents were subjected to histological and quantitative analysis. The N-TiO<SUB>2</SUB> film used in this study was well coated without any cracks or peeling. Surface hydrophilicity (88.8% of angle decrement) could be associated with the decrease in surface roughness post N-TiO<SUB>2</SUB> deposition (37.0%). The platelet adhesion on the N-TiO<SUB>2</SUB> surfaces was less than that on the BMS surface. The proliferation of SMC was suppressed in the N-TiO<SUB>2</SUB>-EVL group (30.2%) but not in the BMS group. In the animal study, the percent area restenosis was significantly decreased in the N-TiO<SUB>2</SUB>-EVL group compared to that in the BMS group. The results (BMS; 47.0 ± 11.00%, N-TiO<SUB>2</SUB>-EVL; 31.7 ± 10.50%, and EES; 29.1 ± 11.21%, <I>n</I> = 10, <I>p</I> < 0.05) were almost at par with those of the commercialized EVL-eluting stent. The introduction of N-TiO<SUB>2</SUB> deposition during fabrication of polymer-free DES may be an efficient accessorial process for preventing in-stent restenosis and thrombosis.</P> <P><B>Highlights</B></P> <P> <UL> <LI> N-TiO<SUB>2</SUB> surfaces can help to reduce the platelet adhesion. </LI> <LI> In porcine model, N-TiO<SUB>2</SUB> everolimus decreased in-stent restenosis and fibrin deposition. </LI> </UL> </P>

Association of HLA-DRB1 and -DQB1 Alleles with Susceptibility to IgA Nephropathy in Korean Patients

In Ji Won,Jung Kiwook,Shin Sue,Park Kyoung Un,Lee Hajeong,Song Eun Young 대한진단검사의학회 2022 Annals of Laboratory Medicine Vol.42 No.1

Background: Associations between IgA nephropathy (IgAN) and HLA-DRB1 and -DQB1 alleles have been reported in several ethnic groups. We investigated the association of HLA-DRB1 and -DQB1 alleles with the predisposition for IgAN and disease progression to end-stage kidney disease (ESKD) in Korean patients. Methods: We analyzed HLA-DRB1 and -DQB1 genotypes in 399 IgAN patients between January 2000 and January 2019 using a LIFECODES sequence-specific oligonucleotide (SSO) typing kit (Immucor, Stamford, CT, USA) or a LABType SSO Typing Test (One Lambda, Canoga Park, CA, USA). Alleles with a significant difference in two-digit resolution were further analyzed using in-house sequence-based typing and sequence-specific primer PCR. As controls, 613 healthy hematopoietic stem cell donors were included. Kidney survival was analyzed in 281 IgAN patients with available clinical and laboratory data using Cox regression analysis. Where needed, P-values were adjusted using Bonferroni correction. Results: The allele frequencies of HLA-DRB1*04:05 (corrected P [Pc]<0.001), -DQB1 *04:01 (Pc=0.048), and -DQB1*03:02 (Pc=0.021) were significantly higher in IgAN patients than in controls, whereas those of HLA-DRB1*07:01, -DRB1*15:01, -DQB1*02:02, and -DQB1*06:02 (Pc<0.001 for all) were significantly lower in IgAN patients than in controls. The allele frequency of HLA-DQB1*05:03 (Pc=0.016) was significantly lower in the ESKD group than in the non-ESKD group; however, there was no significant difference for ESKD progression between these groups. Conclusions: We report novel associations of HLA-DRB1*15:01, DQB1*02:02, -DQB1*03:02, and -DQB1*04:01 with IgAN. Further studies of HLA alleles associated with IgAN progression in a larger cohort and in various ethnic groups are needed.

In-vitro and in-vivo anti-inflammatory and antinociceptive effects of the methanol extract of the roots of Morinda officinalis

Kim, In-Tae,Park, Hee-Juhn,Nam, Jung-Hwan,Park, Young-Mi,Won, Jong-Heon,Choi, Jong-Won,Choe, Bong-Keun,Lee, Kyung-Tae EAST-WEST MEDICAL RESEARCH INSTITUTE KYUNG HEE UNI 2005 東西醫學硏究所 論文集 Vol.2005 No.-

The anti-inflammatory effects of the methanol extract of the roots of Morinda officinalis (MEMO) (Rubiaceae) were evaluated in-vitro and in-vivo. The effects of MEMO on lipopolysaccharide (LPS)induced responses in the murine macrophage cell line RAW 264.7 were examined. MEMO potently inhibited the production of nitric oxide (NO), prostaglandin E₂and tumour necrosis factor-α (TNF-α) in LPS-stimulated RAW 264.7 macrophages. Consistent with these results, the expression of inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) at the protein level, and of iNOS, COX-2 and TNF-α at the mRNA level, was also inhibited by MEMO in a concentration-dependent manner. Furthermore, MEMO inhibited the nuclear factor kappa B (NF-κB) activation induced by LPS, and this was associated with the prevention of degradation of the inhibitor κB (IκB), and subsequently with attenuated p65 protein in the nucleus. The anti-inflammatory effect of MEMO was examined in rats using the carrageenan-induced oedema model. The antinociceptive effects of MEMO were assessed in mice using the acetic acid-induced abdominal constriction test and the hot-plate test. MEMO (100, 200㎎㎏^(-1) per day, p.o.) exhibited anti-inflammatory and antinociceptive effects in these animal models. Taken together, the data demonstrate that MEMO has anti-inflammatory and antinociceptive activity, inhibiting iNOS, COX-2 and TNF-α expression by down-regulating NF-κB binding activity.

Theoretical and experimental analysis of the source resistance components in In0.7Ga0.3As quantum-well high-electron-mobility transistors

Lee In-Geun,Ko Dae-Hong,Yun Seung-Won,Kim Jun-Gyu,Jo Hyeon-Bhin,Kim Dae-Hyun,Tsutsumi Takuya,Sugiyama Hiroki,Matsuzaki Hideaki 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.78 No.6

Herein we describe theoretical and experimental analysis of the source resistance (Rs) components in In0.7Ga0.3As/ In0.52Al0.48As quantum-well (QW) high-electron-mobility transistors (HEMTs) on an InP substrate. First, we analytically modeled Rs using a three-layer formula, separately modeling the regions of the ohmic contact, the gate-to-source access, and the side-recessed regions. The resistances of the ohmic contact and access regions were analyzed in a distributed-network manner with two different transfer lengths, whereas the resistance associated with the side-recess region near the gate edge was modeled by using a lumped element. To verify the accuracy of the proposed Rs model, we fabricated two different types of transmission-line-method (TLM) test patterns as well as long-channel In0.7Ga0.3As/ In0.52Al0.48As QW HEMTs, and compared their measured and modeled Rs. The modeled Rs was in excellent agreement with the measured Rs from the recessed TLM patterns and the long-channel HEMTs. Since the widths of the ohmic contact to the heavily doped In0.53Ga0.47As capping layer and the gate-to-source access region were typically much greater than corresponding transfer lengths ( L T_cap and L T_barrier ), those distributed networks could be simplified to a lumped-element based one-layer model, revealing that the tunneling resistance ( R barrier ) through the In0.52Al0.48As barrier should be carefully considered to minimize the Rs of InxGa1− xAs QW HEMTs together with S/D contact resistances and LGS.