http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김호진(Hojin Kim),김중관(Joong-Kwan Kim),김준환(Junhwan Kim),김현석(Hyunsuk Kim),위혁(Hyuk Wee) 한국방재안전학회 2023 한국방재안전학회 논문집 Vol.16 No.3
본 연구에서는 능동소음제어(ANC) 기술을 층간소음 분야에 적용하기 위하여 40~500 Hz 대역의 중량충격음을 제어하기 위한 ANC 시스템을 구성하였다. ANC 시스템에는 Fx-LMS 알고리즘 기반의 적응형 필터를 활용한 피드포워드 방식의 제어기술을 도입하였다. ANC 시스템 설정을 위해 가상 시뮬레이션을 통해 ANC를 구성하는 변수 연구를 실시하였고, 이를 통해 최적 필터와 시스템 배치 방법을 정립하였다. 또한 본 연구에는 개발된 ANC 시스템을 한국건설생활시험연구원(KCL)의 층간소음 시험실에 설치한 후 표준시험방법에 따라 ANC 시스템 구동 전후 4 dB의 층간소음 저감효과를 확인하였다. 시험결과를 통해 본 연구에서 개발한 ANC 시스템이 중량충격음에 대한 등급 기준을 한 단계를 상향시킬 수 있는 수준의 효과가 있음을 확인하였다. In this study, the application of ANC (Active Noise Control) technology to address inter-floor noise was explored. To achieve this, an ANC system was developed to manage the heavy impact sound within the frequency range of 40 to 500 Hz. The ANC system utilized an adaptive filter employing a feedforward approach based on the Fx-LMS algorithm. To set up the ANC system, a comprehensive analysis of various variables within the system was performed using computational simulations. This process enabled the identification of optimal filter settings and system configuration arrangements. In addition, the ANC system was implemented in the inter-floor noise test room at the Korea Conformity Laboratories (KCL). Through a certified standard testing procedure, it was confirmed that the ANC system led to a 4 dB reduction in inter-floor noise when the system was activated compared to when it was turned off. The results of this study indicate that the developed ANC system has an effect significant enough to elevate the rating criteria by one level for heavy impact sound.
( Junhwan Kim ),( Young Mi Jung ),( Da Yong Lee ),( Byung Chul Jee ) 대한산부인과학회 2017 Obstetrics & Gynecology Science Vol.60 No.1
Objective To investigate individual pretreatment serum human chorionic gonadotropin (hCG) cutoff value for medical treatment success with single-dose and multi-dose regimen of methotrexate in tubal ectopic pregnancy. Methods Eighty-five women who received methotrexate for the treatment of tubal ectopic pregnancy during 2003 to 2015 were selected. Fifty-three women received a single-dose regimen and 32 women received a multi-dose regimen. Medical treatment failure was defined as necessity of surgical treatment. The medical treatment success rate was estimated in both regimens and the pretreatment serum hCG titer to predict the success was assessed by receiver operating characteristics curve analysis. Results Pretreatment clinical and laboratory parameters were similar between group of single-dose regimen and multi-dose regimen. Treatment success rate was 64.2% in the single-dose regimen group and 71.9% in the multi-dose regimen group (P>0.05). Pretreatment serum hCG titer was an independent prognostic factor for treatment success in each regimen. Serum hCG cutoff value to predict the treatment success was 3,026 IU/L in single-dose regimen group and 3,711 IU/L in multi-dose regimen group. Conclusion We recommend use of single-dose regimen when pretreatment serum hCG <3,026 IU/L but multi-dose regimen may be favored when initial serum hCG level between 3,026 and 3,711 IU/L.
Assessment of load sharing behavior for micropiled rafts installed with inclined condition
Kim, Dongho,Kim, Garam,Kim, Incheol,Lee, Junhwan Elsevier 2018 ENGINEERING STRUCTURES Vol.172 No.-
<P><B>Abstract</B></P> <P>As a combined foundation, micropiled rafts under compressive loads show the load-sharing behavior between raft and micropiles. The load carrying and sharing behaviors of micropiled rafts installed with inclined condition would become further complicated as a result of the coupled influences of group and inclined configurations. In this study, the 3D finite element analyses were performed to investigate the load carrying and sharing behaviors of inclined micropiled rafts. Changes in foundation configurations, including micropile inclination angle and spacing, were considered in the analyses. The load carrying capacity of micropiled rafts varied with the inclination angle of micropiles and the proportion of load carried by inclined micropiles was larger than for vertically installed condition. The values of the load sharing ratio α<SUB>p</SUB> for the inclined condition were obtained and analyzed. The normalized load-sharing model for inclined micropiled rafts was proposed with the modified load capacity interaction factor and design equations as a function of micropile configuration and inclination angle. Case studies were selected from the literature and adopted to compare with the calculated results using the proposed method. The calculated results were in reasonable agreement with measured load sharing ratios.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The load carrying behaviors of inclined micropiled rafts were investigated. </LI> <LI> Changes in micropile inclination angle and spacing were considered. </LI> <LI> The values of the load sharing ratio for the inclined condition were obtained. </LI> <LI> The normalized load sharing model for inclined micropiled rafts was proposed. </LI> </UL> </P>
Diagnostic imaging of adnexal masses in pregnancy
( Junhwan Kim ),( Jihye Lim ),( Jeong-won Sohn ),( Seung Mi Lee ),( Maria Lee ) 대한산부인과학회 2023 Obstetrics & Gynecology Science Vol.66 No.3
Adnexal masses detected during pregnancy require a prompt and accurate diagnosis to ensure fetal safety and good oncological outcomes. Computed tomography is the most common and useful diagnostic imaging modality for diagnosing adnexal masses; however, it is contraindicated in pregnant women because of the teratogenic effect of radiation on the fetus. Therefore, ultrasonography (US) is commonly used as the main alternative for the differential diagnosis of adnexal masses during pregnancy. Additionally, magnetic resonance imaging (MRI) can assist in the diagnosis when US findings are inconclusive. As each disease has characteristic US and MRI findings, understanding these features is important for the initial diagnosis and subsequent treatment. Thus, we thoroughly reviewed the literature and summarized the key findings of US and MRI to apply these in real-world clinical practice for various adnexal masses detected during pregnancy.