한국어판 지각된 강요(Perceived Coercion Questionnaire) 척도의 타당화 연구

김용석(Kim, Yongseok),이종호(Lee, Jongho),신수경(Shin, Sookyung),김용묵(Kim, Yongmug),송승연(Song, Seungyeon),이경진(Lee, Kyoungjin),김소연(Kim, Soyeon),김상우(Kim, Sangwoo) 한국정신건강사회복지학회 2018 정신보건과 사회사업 Vol.46 No.2

다수의 중독 클라이언트가 강요에 의해서 치료에 참여하기 때문에 강요의 역할을 이해하는 것이 중요하다. 그러나 지금까지 알코올사용장애 클라이언트가 경험했던 강요에 대해서 연구된 바는 없다. 강요에 대한 연구가 부족한 이유는 다양하겠지만, 강요를 측정할 수 있는 도구의 부재도 관련이 있을 것이다. 지각된 강요 척도(PCQ)는 치료 강요에 대한 중독 클라이언트의 주관적 지각을 측정할 뿐 아니라 다양한 강요의 출처를 측정해주는 유용한 도구이다. 본 연구는 중독분야에서 사용할 수 있는 지각된 강요 척도의 한국어판을 개발하여 관련 연구의 활성화에 기여하고자 하였다. 217명의 알코올사용장애 클라이언트를 대상으로 실시된 한국어판 지각된 강요 척도에 대한 평가결과는 매우 양호하였다. 확인적 요인분석에서 한국어판 지각된 강요 척도는 영어판 척도처럼 6개의 하위요인으로 구성된 것으로 나타났다. 한국어판 지각된 강요 척도의 내적 일관성 신뢰도는 다양한 방법으로 평가되었고 평가결과는 매우 양호하였다. 또한, 한국어판 지각된 강요 척도의 수렴타당도와 판별타당도 결과도 양호하였다. 이는 한국어판 지각된 강요 척도를 구성하는 6개 하위요인에 적재된 문항들은 동일한 요인을 측정하였고 각 요인이 서로 구별되는 개념을 측정하는 정도가 양호하다는 의미로 해석될 수 있다. 한국어판 지각된 강요 척도의 개발은 중독 클라이언트가 인지하는 강요를 측정 가능하게 하여 관련 연구의 활성화에 기여할 것으로 기대된다. Since many people with alcohol use disorder enter treatment by coercion, it is important to understand the role of coercion in treatment entry process. However, studies on coercion have been very scarce. The reason for the lack of research on coercion may be related to the absence of proper instruments measuring the construct. The Perceived Coercion Questionnaire is an instrument not only to measure individuals’ perception of coercion but also measuring various sources of coercion. The purpose of this study is to develop a Korean version of the Perceived Coercion Questionnaire (PCQ). A total of 217 people with alcohol use disorder participated in this study. The findings of this study were satisfactory. Confirmatory factor analysis confirmed that the Korean version of the PCQ, like its English version, is composed of 6 factors (self, family, legal, finance, health, work). The Korean version of the PCQ showed high internal consistency reliability and satisfactory construct validity. The development of the Korean version of the PCQ would contribute to conducting scientific studies on coercion.

Cryogenic Tensile Behavior of Ferrous Medium-entropy Alloy Additively Manufactured by Laser Powder Bed Fusion

Seungyeon Lee,Kyung Tae Kim,Ji-Hun Yu,Hyoung Seop Kim,Jae Wung Bae,Jeong Min Park 한국분말재료학회(구 한국분말야금학회) 2024 한국분말재료학회지 (KPMI) Vol.31 No.1

The emergence of ferrous-medium entropy alloys (FeMEAs) with excellent tensile properties represents a potential direction for designing alloys based on metastable engineering. In this study, an FeMEA is successfully fabricated using laser powder bed fusion (LPBF), a metal additive manufacturing technology. Tensile tests are conducted on the LPBF-processed FeMEA at room temperature and cryogenic temperatures (77 K). At 77 K, the LPBF-processed FeMEA exhibits high yield strength and excellent ultimate tensile strength through active deformation-induced martensitic transformation. Furthermore, due to the low stability of the face-centered cubic (FCC) phase of the LPBFprocessed FeMEA based on nano-scale solute heterogeneity, stress-induced martensitic transformation occurs, accompanied by the appearance of a yield point phenomenon during cryogenic tensile deformation. This study elucidates the origin of the yield point phenomenon and deformation behavior of the FeMEA at 77 K.

Feasibility study of shutter scan acquisition for region of interest ( ROI ) digital tomosynthesis

Kim, Dohyeon,Jo, Byungdu,Lee, Donghoon,Lee, Haenghwa,Choi, Sunghoon,Kim, Hyemi,Chao, Zhen,Choi, Seungyeon,Kim, Hee‐,Joung unknown 2018 Journal of applied clinical medical physics Vol.19 No.3

<P><B>Abstract</B></P><P>Dose reduction techniques have been studied in medical imaging. We propose shutter scan acquisition for region of interest (ROI) imaging to reduce the patient exposure dose received from a digital tomosynthesis system. A prototype chest digital tomosynthesis (CDT) system (LISTEM, Wonju, Korea) and the LUNGMAN phantom (Kyoto Kagaku, Japan) with lung nodules 8, 10, and 12 mm in size were used for this study. A total of 41 projections with shutter scan acquisition consisted of 21 truncated projections and 20 non‐truncated projections. For comparison, 41 projections using conventional full view scan acquisition were also acquired. Truncated projections obtained by shutter scan acquisition were corrected by proposed image processing procedure to remove the truncation artifacts. The image quality was evaluated using the contrast to noise ratio (CNR), coefficient of variation (COV), and figure of merit (FOM). We measured the dose area product (DAP) value to verify the dose reduction using shutter scan acquisition. The ROI of the reconstructed image from shutter scan acquisition showed enhanced contrast. The results showed that CNR values of 8 and 12 mm lung nodules increased by 6.38% and 21.21%, respectively, and the CNR value of 10 mm lung nodule decreased by 3.63%. COV values of the lung nodules were lower in a shutter scan image than in a full view scan image. FOM values of 8, 10, and 12 mm lung nodules increased by 3.06, 2.25, and 2.33 times, respectively. This study compared the proposed shutter scan and conventional full view scan acquisition. In conclusion, using a shutter scan acquisition method resulted in enhanced contrast images within the ROI and higher FOM values. The patient exposure dose of the proposed shutter scan acquisition method can be reduced by limiting the field of view (FOV) to focus on the ROI.</P>

A Study on the Allowable Range of Overhanging Berthing at the Port of Ulsan

Kim, Seungyeon,Yu, Yongung,Lee, Yunsok The Korean Society of Marine Environment and safet 2019 海洋環境安全學會誌 Vol.25 No.3

As vessels become larger and competition between ports intensifies, there has been an increase in the number of cases where vessels that exceed the available berths are berthed at the pier. Therefore, there has been an increase in the number of cases in which the bow or stern of a ship is projected and moored. The risk of overhanging berthing is that mooring safety can be compromised because it is not possible to connect the bow and stern mooring line to the ship properly. In addition, collision accidents may occur between moving vessels if the view of a vessel moving in the port is obstructed. Therefore, in this study, the simulation of mooring safety was performed according to the overhanging range in Piers No. 6 and 7 in Ulsan's main port to propose the overhanging limit and operational standards according to each ship. As a result of the assessment, 30,000 DWT bulkers are able to overhang up to 0.75B, and 50,000 DWT bulkers can overhang up to 0.50B. The results of this study are expected to be used as basic data for setting the allowable overhang limit, as well as clear usage criteria for safe unloading operations.

A Study on the Allowable Range of Overhanging Berthing at the Port of Ulsan

Seungyeon Kim,Yongung Yu,Yunsok Lee 해양환경안전학회 2019 海洋環境安全學會誌 Vol.25 No.3

As vessels become larger and competition between ports intensifies, there has been an increase in the number of cases where vessels that exceed the available berths are berthed at the pier. Therefore, there has been an increase in the number of cases in which the bow or stern of a ship is projected and moored. The risk of overhanging berthing is that mooring safety can be compromised because it is not possible to connect the bow and stern mooring line to the ship properly. In addition, collision accidents may occur between moving vessels if the view of a vessel moving in the port is obstructed. Therefore, in this study, the simulation of mooring safety was performed according to the overhanging range in Piers No. 6 and 7 in Ulsan’s main port to propose the overhanging limit and operational standards according to each ship. As a result of the assessment, 30,000 DWT bulkers are able to overhang up to 0.75B, and 50,000 DWT bulkers can overhang up to 0.50B. The results of this study are expected to be used as basic data for setting the allowable overhang limit, as well as clear usage criteria for safe unloading operations.

Characterization of push-pull type of conjugated polymers containing 8<i>H</i>-thieno[2,3-<i>b</i>]indole for organic photovoltaics

Kim, Juae,Chae, Sangmin,Yi, Ahra,Hong, Seungyeon,Kim, Hyo Jung,Suh, Hongsuk Elsevier 2018 Synthetic metals Vol.245 No.-

<P><B>Abstract</B></P> <P>Polymers using thieno[2,3-<I>b</I>]indole (2-TI) with high planarity were synthesized and utilized for the photovoltaics. Conjugated polymers (<B>PTIDTBT, PTIFDTBT</B> and <B>PTIDFDTBT</B>) containing 2-TI as electron-donating unit and fluorinated DTBT as electron-accepting unit were synthesized.</P> <P>To enhance the effect of lowering highest occupied molecular orbital (HOMO) energy level for the high open-circuit voltages (<I>V</I> <SUB>OC</SUB>), we utilized new thieno[2,3-<I>b</I>]indole (2-TI) moiety as the weak electron-donating group and the fluoro-substituted electron-accepting BT unit.</P> <P>The polymer composed of BT with two fluorine unit coupled with 2-TI, <B>PTIDFDTBT</B>, shows higher <I>V</I> <SUB>OC</SUB> out of the series. The device comprising <B>PTIDFDTBT</B> and PC<SUB>71</SUB>BM (1:3) showed a <I>V</I> <SUB>OC</SUB> of 0.79 V, a <I>J</I> <SUB>SC</SUB> of 8.39 mA/cm<SUP>2</SUP>, and a fill factor (<I>FF</I>) of 0.48, giving a power conversion efficiency of 3.21%.</P>

Ethylenediamine Promotes Cu Nanowire Growth by Inhibiting Oxidation of Cu(111)

Kim, Myung Jun,Flowers, Patrick F.,Stewart, Ian E.,Ye, Shengrong,Baek, Seungyeon,Kim, Jae Jeong,Wiley, Benjamin J. American Chemical Society 2017 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.139 No.1

<P>The synthesis of metal nanostructures usually requires a capping agent that is generally thought to cause anisotropic growth by blocking the addition of atoms to specific crystal facets. This work uses a series of electrochemical measurements with a quartz crystal microbalance and single-crystal electrodes to elucidate the facet-selective chemistry occurring in the synthesis of Cu nanowires. Contrary to prevailing hypotheses, ethylenediamine, a so-called capping agent in the synthesis of Cu nanowires, causes anisotropic growth by increasing the rate of atomic addition to (111) facets at the end of a growing nanowire relative to (100) facets on the sides of a nanowire. Ethylenediamine increases the reduction rate of Cu(OH)(2)(-) on a Cu(111) surface relative to Cu(100) by selectively inhibiting the formation of Cu oxide on Cu(111). This work demonstrates how studying facet-selective electrochemistry can improve the understanding of the processes by which atoms assemble to form anisotropic metal nanostructures.</P>

Growth of Bi₂Se₃ topological insulator thin film on Ge(111) substrate

Kim, Seungyeon,Lee, Sangsoo,Woo, Jeongseok,Lee, Geunseop Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.432 No.2

<P><B>Abstract</B></P> <P>Atomically smooth, single crystalline Bi<SUB>2</SUB>Se<SUB>3</SUB> thin films were grown on a Ge(111) substrate using molecular beam epitaxy. Crystallinities of both the surface and the bulk as well as the stoichiometry of the grown film were characterized by using low-energy electron diffraction, scanning tunneling microscopy, X-ray diffraction, and photoelectron spectroscopies. Hexagonal atomic structures, quintuple layer steps observed in STM images confirmed that the Bi<SUB>2</SUB>Se<SUB>3</SUB> film with a (0001) surface was grown. Diffraction peak positions as well as the chemical composition determined from the core-level photoelectron spectra coincide well with those expected for the Bi<SUB>2</SUB>Se<SUB>3</SUB> crystal. The surface state with a Dirac cone was observed in the valence photoelectron spectra, which also support that a high-quality Bi<SUB>2</SUB>Se<SUB>3</SUB> film was grown on the Ge(111) substrate. The interface between Ge(111) and Bi<SUB>2</SUB>Se<SUB>3</SUB>(0001) is expected to be abrupt due to the small lattice between them.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Growing Bi2Se3 thin films grown on the Ge(1 1 1) substrate, which is pretreated by the adsorption of Bi atom. </LI> <LI> High crystallinities in the bulk and at the surface and the stoichiometry of the grown Bi2Se3 films were characterized by multiple experimental techniques including LEED, STM, XRD, XPS, and ARPES. </LI> <LI> The (0 0 0 1) surface is formed at the surface of the grown Bi2Se3 film. </LI> <LI> Due to the small lattice mismatch between Bi2Se3(0 0 0 1) and Ge(1 1 1), the interface is expected to be abrupt, sharper than that between Bi2Se3 and Si. </LI> </UL> </P>

색상 히스토그램을 활용한 Concatenated 합성곱 신경망 기반의 화성암 이미지 자동화 분류

김동휘(Kim, Donghwi),최승연(Choi, Seungyeon),김승기(Kim, Seunggi),윤희정(Youn, Heejung) 대한토목학회 2023 대한토목학회 학술대회 Vol.2023 No.10

Effective detective quantum efficiency of two detectors in a prototype digital breast tomosynthesis

Choi, Seungyeon,Choi, Sunghoon,Lee, Donghoon,Kim, Ye-seul,Choi, Young-Wook,Kim, Hee-Joung Elsevier 2019 Optik Vol.178 No.-

<P><B>Abstract</B></P> <P>Digital breast tomosynthesis (DBT) system is a novel imaging modality that strongly depends on the detector performance. The effective detective quantum efficiency (eDQE) is a newly accepted system of performance analysis metric that solves the disadvantages of conventional DQE evaluations, which do not consider clinical operating conditions. To evaluate the eDQE, we used the direct-conversion based Anrad detector and the indirect-conversion based Dexela detector. Our aim is to study the performance of such detectors when they are mounted on a prototype DBT system. The prototype DBT system consists of a CsI(Tl) scintillator/CMOS-based flat panel digital detector and an a-Se based direct conversion detector developed by the Korea Electrotechnology Research Institute (KERI). The performance of the two detectors was compared on the basis of scatter fraction, transmission factor, effective modulation transfer function (eMTF), and effective normalized noise power spectrum (eNNPS). As a result, the Dexela detector is characterized by a decreasing eNNPS trend as the spatial frequency increases, whereas the Anrad eNNPS looks almost independent of the spatial frequency. The eMTF was found to be higher in the Anrad detector compared to that in the Dexela one for all frequencies. The eDQE values at 1 cycle/mm (low frequency) were 0.11 and 0.17 for the Anrad and Dexela detectors, respectively, and the values of the spatial frequency <SUB> f e D Q E ( 0.1 ) </SUB> , corresponding to eDQE = 0.1, were 1.25 and 2.81 cycles/mm for the Anrad and Dexela detectors, respectively. The Dexela detector also presented a higher contrast-to-noise ratios (CNRs) for all different sizes of μCa groups, thus demonstrating overall better eDQE results in imaging performance compared to the Anrad detector.</P>