Acute Pulmonary Embolism and Chronic Thromboembolic Pulmonary Hypertension: Clinical and Serial CT Pulmonary Angiographic Features

An Junho,Nam Yoojin,Cho Hyoun,Chang Jeonga,Kim Duk-Kyung,Lee Kyung Soo 대한의학회 2022 Journal of Korean medical science Vol.37 No.10

In acute pulmonary embolism (PE), circulatory failure and systemic hypotension are important clinically for predicting poor prognosis. While pulmonary artery (PA) clot loads can be an indicator of the severity of current episode of PE or treatment effectiveness, they may not be used directly as an indicator of right ventricular (RV) failure or patient death. In other words, pulmonary vascular resistance or patient prognosis may not be determined only with mechanical obstruction of PAs and their branches by intravascular clot loads on computed tomography pulmonary angiography (CTPA), but determined also with vasoactive amines, reflex PA vasoconstriction, and systemic arterial hypoxemia occurring during acute PE. Large RV diameter with RV/left ventricle (LV) ratio > 1.0 and/or the presence of occlusive clot and pulmonary infarction on initial CTPA, and clinically determined high baseline PA pressure and RV dysfunction are independent predictors of oncoming chronic thromboembolic pulmonary hypertension (CTEPH). In this pictorial review, authors aimed to demonstrate clinical and serial CTPA features in patients with acute massive and submassive PE and to disclose acute CTPA and clinical features that are related to the prediction of oncoming CTEPH.

광대역 인쇄형 대수주기 다이폴 배열 안테나 설계 및 제작

여준호,이창식 대구대학교 정보통신연구소 2011 情報通信硏究 Vol.8 No.1

본 논문에서는 1:6의 넓은 대역폭을 가지는 광대역 인쇄형 대수주기 다이폴 배열(LPDA) 안테나를 설계하고 제작하였다. 일반적으로 알려져 있는 원통형 도체 다이폴을 이용한 LPDA 안테나의 설계 방법을 이용하여 유전체 기판에 적용할 수 있는 평면 스트립 다이폴로 구성된 인쇄형 LPDA안테나를 설계하였고, 다이폴의 길이와 급전선의 폭에 따른 안테나 특성 변화를 연구하였다. 제안된 설계 방법을 이용하여 1GHz~6GHz 대역에서 6dBi의 이득을 가지는 LPDA 안테나를 FR4 기판에 제작하였고 시뮬레이션 결과와 잘 일치함을 알 수 있었다. In this paper, a wideband printed log-periodic dipole array (LPDA) antenna with 1:6 broad bandwidth is designed and fabricated. We first design a printed LPDA antenna consisting of planar strip dipoles which can be applicable for dielectric substrates by using a general design methodology for a LPDA antenna with cylindrical conductor dipoles, and the variations on the performance of the LPDA antenna in terms of dipole lengths and feed-line width are investi- gated. A printed LPDA antenna with 6dBi gain operating 1GHz to 6GHz is fabricated on FR4 substrate by using the proposed design method, and the measured results agree well compared to the simulated results.

혁신제품개발 교육과정 개발을 위한 전략수립 방법

정기효(Kihyo Jung),장준호(Junho Chang),이원섭(Wonsup Lee),장준호(Joonho Chang),유희천(Heecheon You),장수영(Soo Y. Chang),전치혁(Chihyuck Jun) 한국공학교육학회 2008 공학교육연구 Vol.11 No.3

기업에서는 경쟁력 제고를 위해 혁신제품개발 전문인력을 필요로 하나, 혁신제품개발 전문인력을 위한 대학의 교육과정 개설은 미흡한 실정이다. 본 연구는 대학에서 혁신제품개발 교과과정 개발을 위한 체계적 전략수립 방법을 제안하고 교육과정 개발에 적용하였다. 본 연구의 전략수립 방법은 순차적인 3 단계(전략요소 도출, 전략적 과제 수립, 전략실행 roadmap 수립)로 구성되어 체계적으로 교과과정 개발을 위한 전략을 수립할 수 있게 한다. 또한, 개발된 전략수립 방법은 P 대학의 “인간친화형 혁신제품 개발 모듈 교육과정” 개발 전략수립에 활용되었다.본 연구의 혁신제품개발 교육과정 개발 전략수립 방법은 제품개발 교육과정뿐만 아니라, 대학의 특성을 고려한 차별화된 신규 교육과정 개발에 유용하게 활용될 수 있을 것이다. Far greater than ever before is the present industrial demand for skilled professionals in innovative product design and development. Yet there is an apparent lack of a sufficient curricular provision for training design professionals in almost all engineering schools. The present study is to propose a systematic procedure for developing a strategy for building an innovative product design curriculum and demonstrate its application. The procedure consists of three major steps: strategic element derivation, task formulation, and task execution roadmap construction. The proposed procedure was applied to develop a modular curriculum (a cluster of several related courses) covering various subjects in relation to innovative product design and development. The procedure seems quite effective and useful for developing a curriculum that is strategically well differentiated based on the unique characteristics of a particular educational institute and its applicability seems not limited to a specific domain.

Treatment Strategy for Impending Instability in Spinal Metastases

Yeon Ho Kim,Junho Kim,Sam Yeol Chang,Hyoungmin Kim,Bong-Soon Chang 대한정형외과학회 2020 Clinics in Orthopedic Surgery Vol.12 No.3

Background: Determining surgical management of a spinal metastasis is difficult owing to the involvement of multiple factors. The spinal instability neoplastic score (SINS) system is a reliable tool to evaluate instability in spinal metastases. The intermediate SINS (scores 7–12) indicates impending instability, which makes it difficult to determine the proper treatment strategy. In this study, we aimed to compare the initial status and treatment outcomes of a conservative group versus an operative group among patients with spinal metastases with an intermediate SINS of 7–12. Further, we evaluated the time for conversion to surgery in patients who had initially undergone conservative treatment and identified the factors associated with the conversion. Methods: Among the patients with a spinal metastasis with an intermediate SINS of 7–12 from May 2013 to December 2017, those who were followed up for more than 12 months were enrolled in this study. Patients with signs of a neurologic deficit or cord compression at the initial diagnosis were excluded. Finally, 79 patients (47 in the initially conservative group and 32 in the initially operative group) were enrolled in this study. The performance status, Tomita score, and Tokuhashi score were assessed for group comparison. Components of SINS, the Bilsky grade, and radiosensitivity of tumor were evaluated to determine factors associated with conversion to surgery. Results: Average follow-up was 20.9 months (range, 12–46 months). The demographic variables, primary cancer type, and performance status were not significantly different between the 2 groups. However, the Tomita score was lower in the initially operative group (p = 0.006). The 1-year treatment outcome assessed based on the change in performance status and vertebral height collapse showed a tendency to deteriorate less in the initially operative group. The rate of conversion to surgery in the initially conservative group was 33% in the first year, after which there was little change in the incidence of conversion. When vertebral body collapse was less than 50% or the tumor was located in the semi-rigid region (T3–T10), the need for conversion to surgery increased statistically significantly (p = 0.039 and p = 0.042, respectively). Conclusions: The rate of conversion to surgery in initially conservatively treated patients was about 33% in the first year. When a tumor is located in T3–T10 and less than 50% vertebral body collapse is present, surgery may be the better choice than conservative treatment.

Genial tubercle position and genioglossus advancement in obstructive sleep apnea (OSA) treatment: a systematic review

Chang, Edward T.,Kwon, Yong-Dae,Jung, Junho,Capasso, Robson,Riley, Robert,Liu, Stanley C.,Camacho, Macario Korean Association of Maxillofacial Plastic and Re 2019 Maxillofacial Plastic Reconstructive Surgery Vol.41 No.-

Background: To systematically review the literature for methods to localize the genial tubercle as a means for performing an advancement of the genioglossus muscle. Methods: PubMed, Google Scholar, CRISP, EMBASE, CINAHL, and Scopus were searched from inception through June 16, 2015. Results: One hundred fifty-two articles were screened, and the full text versions of 12 articles were reviewed in their entirety and 7 publications reporting their methodology for localizing the genial tubercle. Based upon these measurements and the results published from radiographic imaging and cadaveric dissections of all the papers included in this study, we identified the genial tubercle as being positioned within the mandible at a point 10 mm from the incisor apex and 10 mm from the lower mandibular border. Conclusion: Based upon the results of this review, the genial tubercles were positioned within the mandible at a point 10 mm from the incisor apex and 10 mm from the lower mandible border. It may serve as an additional reference for localizing the genial tubercle and the attachment of the genioglossus muscle to the mandible, although the preoperative radiological evaluation and the palpation of the GT are recommended to accurately isolate.

Broadband perfect absorption in Epsilon-Near-Zero ITO thin films at the near-infrared

Junho YOON,Tae Young KIM,Wonyoung KIM,Young Chul JUN,Chang Kwon HWANGBO 한국진공학회 2016 한국진공학회 학술발표회초록집 Vol.2016 No.8

Performance Analysis of Interleaved Memory Architecture for SIMD Processors

Junho Cho,Hoseok Chang,Wonyong Sung 대한전자공학회 2006 ICEIC:International Conference on Electronics, Inf Vol.2006 No.6

Development of an Engineered Escherichia coli Strain Grows on CO₂ and Formic Acid

Junho BANG,Chang hun HWANG,Jung Ho AHN,Jong An LEE,Taehee HAN,Sang Yup LEE 한국생물공학회 2022 한국생물공학회 학술대회 Vol.2022 No.9

Multi-parametric Model Predictive Control for Variable Valve Timing

Junho Lee,Hyuk-Jun Chang 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10

Volumetric efficiency (VE) in a four-stroke internal combustion (IC) engine has been an important issue in the automotive industry because it determines IC engine performance. VE is determined by the volume of air in the intake manifold, the valve sizes, the valve locations, and cam profile characteristics. Variable valve timing (VVT) control is a technique used to optimize VE by continuously varying valve timing. Among VVT control strategies, a variable valve phasing (VVP) controller that varies exhaust camshaft phasing is designed using multi-parametric model predictive control(mpMPC). Model predictive control (MPC) has been regarded as a powerful control method for anticipating future events and fulfilling constraints on the state and input by online optimization. However, the corresponding computational complexity of online optimization is a major drawback of MPC; therefore, mpMPC has been suggested to alleviate the computational burden by parametrizing the state vector. mpMPC computes an optimal input to the plant by solving a multi-parametric quadratic program (mp-QP). A VVP mechanism model and a PID controller, as well as an mpMPC controller, are presented in this paper. The proposed controller demonstrates superiority over the PID controller in terms of its tracking performance and bandwidth.

Engineered Escherichia coli Grows on CO2 and Formic Acid Alone

Junho BANG,Chang Hun HWANG,Jung Ho AHN,Jong An LEE,Jeageon LEE,Sang Yup LEE 한국생물공학회 2023 한국생물공학회 학술대회 Vol.2023 No.10