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- 저자 : Jongbae Park (검색결과 88 건)
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Modeling and measurement of simultaneous switching noise coupling through signal via transition
Jongbae Park,Hyungsoo Kim,Youchul Jeong,Jingook Kim,Jun So Pak,Dong Gun Kam,Joungho Kim Institute of Electrical and Electronics Engineers 2006 IEEE transactions on advanced packaging Vol.29 No.3
<P>The signal via is a heavily utilized interconnection structure in high-density System-on-Package (SoP) substrates and printed circuit boards (PCBs). Vias facilitate complicated routings in these multilayer structures. Significant simultaneous switching noise (SSN) coupling occurs through the signal via transition when the signal via suffers return current interruption caused by reference plane exchange. The coupled SSN decreases noise and timing margins of digital and analog circuits, resulting in reduction of achievable jitter performance, bit error ratio (BER), and system reliability. We introduce a modeling method to estimate SSN coupling based on a balanced transmission line matrix (TLM) method. The proposed modeling method is successfully verified by a series of time-domain and frequency-domain measurements of several via transition structures. First, it is clearly verified that SSN coupling causes considerable clock waveform distortion, increases jitter and noise, and reduces margins in pseudorandom bit sequence (PRBS) eye patterns. We also note that the major frequency spectrum component of the coupled noise is one of the plane pair resonance frequencies in the PCB power/ground pair. Furthermore, we demonstrate that the amount of SSN noise coupling is strongly dependent not only on the position of the signal via, but also on the layer configuration of the multilayer PCB. Finally, we have successfully proposed and confirmed a design methodology to minimize the SSN coupling based on an optimal via positioning approach</P>
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Jongbae Park,Lu, A.C.W.,Chua, K.M.,Wai, L.L.,Junho Lee,Joungho Kim IEEE 2006 IEEE microwave and wireless components letters Vol.16 No.9
<P>We propose a novel electromagnetic bandgap (EBG) structure with a significantly extended noise isolation bandwidth, called a double-stacked EBG (DS-EBG) structure, fabricated on a low-temperature co-fired ceramic (LTCC) multilayer substrate. The DS-EBG structure was devised for wideband suppression of simultaneous switching noise (SSN) coupling in system-in-package (SiP) applications. Our design approach was enabled by combining two EBG layers embedded between the power and ground planes. The two EBG layers had different bandgaps from using different cell sizes. Enhanced wideband suppression of the SSN coupling was validated using a 11.4-GHz noise stop bandwidth with 30-dB isolation in time and frequency domain measurements up to 20GHz</P>
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Park, Jongbae,Lu, Albert Chee W.,Sunappan, Vasudivan,Wai, Lai L.,Kim, Joungho Wiley Subscription Services, Inc., A Wiley Company 2008 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.50 No.4
<P>The advantages of a dielectric loaded double-stacked electromagnetic bandgap structure with a significantly improved noise isolation bandwidth, fabricated on a low-temperature co-fired ceramic multilayer substrate, were experimentally demonstrated in system-in-package applications. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 942–944, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23253</P>
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Moxibustion for treating menopausal hot flashes: a randomized clinical trial
Park, Ji-Eun,Lee, Myeong Soo,Jung, Soyoung,Kim, Aeran,Kang, Kyungwon,Choi, Junyong,Park, Jongbae,Choi, Sun-Mi The North American Menopause Society 2009 Menopause Vol.16 No.4
OBJECTIVE:: A hot flash is a general postmenopausal symptom experienced by approximately 75% of climacteric women. Women often turn to complementary and alternative medicines to relieve hot flashes. Moxibustion is one such medication. The aim of this study was to evaluate the effect of moxibustion on hot flashes in perimenopausal and postmenopausal women. METHODS:: Fifty-one participants were randomly assigned into three groups, namely, moxibustion 1, moxibustion 2, and waiting list (control). The moxibustion groups received 14 sessions of moxibustion treatment for 4 weeks at acupuncture points. Our protocol was supported by evidence from clinical experts (Moxa 1) or published literature (Moxa 2), and we followed all participants for an additional 2 weeks after the end of the study. Our primary outcome measures were frequency and severity of hot flashes. Secondary outcome parameters included quality of life (Menopausal-Specific Quality of Life Scale) and Menopause Rating Scale. RESULTS:: Fifty-one women participated in our study. By week 4, the difference in severity and frequency of hot flashes had become statistically significant between the treatment groups and the control participants. In addition, there was a statistically significant difference in Menopausal-Specific Quality of Life Scale scores between treatment group 2 and the other groups. CONCLUSIONS:: Our results suggest that moxibustion reduces both the frequency and severity of menopausal hot flashes as compared with those in control participants. We would recommend further studies with larger samples and possibly including placebo controls.
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Integrative package for low back pain with leg pain in Korea: A prospective cohort study
Park, Jongbae J.,Shin, Joonshik,Choi, Youngkwon,Youn, Yousuk,Lee, Sangho,Kwon, Seung-Ro,Lee, Hyangsook,Kang, Man-Ho,Ha, In-Hyuk,Shin, Imhee Elsevier 2010 COMPLEMENTARY THERAPIES IN MEDICINE Vol.18 No.2
<P><B>Summary</B></P><P>Back pain significantly affects both patients and society through personal suffering, supporting burden, work loss, and incurred expenses. With no unequivocal support for surgery versus conservative treatment, an integrative approach has become popular in Korea.</P><P><B>Objectives</B></P><P>To investigate the outcomes of an integrative package for low back pain with leg pain.</P><P><B>Methods</B></P><P>A prospective cohort study involving patients with low back and leg pain and confirmed disc herniation was carried out at an outpatient clinic in Korea. The treatment package comprised of herbal medicines, acupuncture, bee venom acupuncture, and a Korean version of spinal manipulation (Chuna). Study participants were evaluated at baseline and every 4 weeks for 24 weeks. Low back and leg pain intensity levels were measured on a visual analog scale (0–10), back function was evaluated with the Oswestry Disability Index (0–100), and the overall quality of life was assessed using the SF-36 Health Survey (0–100 in 8 different subcategories).</P><P><B>Results</B></P><P>Out of 150 patients, 128 completed the 24 weeks of therapy. Patients reported improvements in all outcome measures. At the completion of the study, low back pain scores improved by a mean of 3.3 (95% CI=2.8 to 3.8), and leg pain scores improved by a mean of 6.3 (95% CI=5.9 to 6.6). Significant improvements in ODI and SF-36 scores were observed at 4 weeks and sustained throughout.</P><P><B>Conclusions</B></P><P>This integrative package was effective in the treatment of LBP with leg pain and warrants further rigorous investigations.</P>
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Park, Jieun,Park, Eun Ha,Schauer, James J.,Yi, Seung-Muk,Heo, Jongbae Elsevier 2018 Environment international Vol.117 No.-
<P><B>Abstract</B></P> <P>Substantial increase in level of particulate matter has raised concerns in South Korea recently. Ambient particulate matter is classified as Group I carcinogen (IARC, 2013) and multiple epidemiological studies has demonstrated adverse health effects due to exposure of particulate matter. Fine particulate matter (PM<SUB>2.5</SUB>) which has a diameter <2.5 μm is likely to penetrate deeply into lung and is known to be eliciting adverse health effects. A number of epidemiological studies have been conducted on adverse health effects of PM-related diseases and mortality rate, yet particulate matter (PM)-induced reactive oxygen species (ROS) activity at the cellular level has not been actively studied in Korea. This study assessed PM-induced oxidative potential by exposure of collected ambient PM<SUB>2.5</SUB> samples to the rat alveolar macrophage cell line. The characteristics of PM<SUB>2.5</SUB> in Korea were further characterized by linking chemical constituents and contributing sources to ROS. PM<SUB>2.5</SUB> mass concentration during the cold season was relatively higher than mass concentration during the warm season and chemical constituents except for Secondary Organic Carbon (SOC) and SO<SUB>4</SUB> <SUP>2−</SUP> which both showed similar trends in both the cold and cold seasons. The concentration of crustal elements was especially high during the cold season which can be an indication of long range transport of Asian dust. Water soluble organic carbon and water soluble transition metals (Cr and Zn) were also shown to be correlated to oxidative potential and metals such as As and V were shown to have a high contribution to ROS activity according to stepwise multiple linear regression. Principal Component Analysis (PCA) results identified six factors that can be interpreted as soil, mobile, industry, secondary inorganic aerosol, secondary organic aerosol and oil combustion. Moreover, through Principal Component Regression (PCR), industry, soil, mobile and SIA were shown to be statistically significant sources in a relation to ROS activity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> PM-induced oxidative potential was assessed through cellular responses. </LI> <LI> WSOC and meals (As and V) exhibited high positive association with the ROS activity. </LI> <LI> Industry and soil sources were strongly correlated with ROS activity. </LI> </UL> </P>
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박종배(Jongbae Park),조상식(Sangsik Cho),임광국(Gwangguk Yim) 한독교육학회 2014 교육의 이론과 실천 Vol.19 No.2
최근 교육의 공공성 개념은 교육 정책 분야에서 논쟁의 대상이 되고 있을 정도로 지반이 흔들리고 있다. 특히 교육 영역에 시장주의가 침투하는 정도가 심해지고 있는 상황에서 이는 더욱 두드러지고 있다. 물론 역사적 관점에서 보았을 때 교육의 공공성 개념은 근대의 산물이긴 하다. 그럼에도 교육에 대한 규범적·반성적 차원에서 이에 대한 비판과 저항도 거세다. 국가와 결부된 공적(公的, official) 성격, 모든 사람이 관계하는 공통(共通, common)의 성격, 그리고 모든 이들에게 개방된(open) 성격을 교육 공공성의 준거라고 했을 때, 비교교육적으로 그 모범적 사례를 모색할 수 있다. 이에 본 연구는 교육 공공성의 세 가지 준거에 대체로 합치하면서 국가주도적인 특징을 가진 교육 공공성의 실례를 독일의 교육제도에서 찾았다. 현재 시행되고 있는 독일의 교육정책인 의무․무상 교육, 아동 및 청소년 지원 복지 체제, 취약계층 지원 정책 등을 교육 평등을 보장하기 위한 정책적 노력이자 교육의 공공성을 보존하고 있는 대표적인 사례로 본 것이다. 본 연구의 결과에 따르면, 독일의 교육정책은 시장주의가 만연한 시대적 상황에서도 교육의 공공성이 견실하게 작동되고 있는 모범적 사례이다. Nowadays the concept educational publicity has been deprived of its safe ground, to such an extend that it becomes a target for controversial issues in the dimension of educational reality. In particular, this fact seems remarkable in a situation that the infiltration of market ideology into human education is becoming excruciating. From the point of historical view, the concept of educational publicity is naturally one of the western modern achievements. Nevertheless critical and resistant winds against such an unpleasant tendencies are also blowing in the fields of the normative and reflective pedagogy. When we consider the official characteristic related to state, the common one connected with people of all and the open one to people of all as three refinedly chosen references to educational publicity, a representative sample can be laid out from the perspective of comparative educational study. For this reason the article concludes that the educational policy in Germany is in accord with above-mentioned references to educational publicity and a stately led type. The compulsory and free education, institutional welfare for backing children and teenagers and support system for vulnerable social group are educational-political endeavors in order to actualize educational equality, and can be the standard of how we measure educational publicity. Clearly the institutional model of German educational policy is working soundly with undamaged state of educational publicity.
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