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Park, Junyong,Kim, Hyesoo,Kim, Jonghoon J.,Kim, Dong-Hyun,Son, Kyungjune,Kim, Subin,Lee, Seongsoo,Cho, Kyungjun,Bae, Bumhee,Ha, Dongho,Bae, Michael,Kim, Joungho IEEE 2018 IEEE transactions on components, packaging, and ma Vol.8 No.12
<P>This paper, for the first time, proposes and verifies a new coaxial silicone rubber socket for high-bandwidth and high-density package test using a fabricated sample. In addition, this paper also characterizes and verifies the coaxial silicone rubber socket. Because of the proposed coaxial socket’s novel coaxial structure, the proposed socket successfully achieves the electrical performance improvement. For verification, we compare the proposed socket and the previous noncoaxial socket in time domain. The proposed socket has greater eye height and eye width in the measured eye diagram than those of the noncoaxial socket. Moreover, the slope in the eye diagram is also improved in the case of the proposed socket. Therefore, the measured eye diagram for the coaxial socket shows the improvement in electrical performances. This paper also characterizes the equivalent RLGC model for the coaxial silicone rubber socket. In order to verify the RLGC model, we compare the insertion losses and eye diagrams from measurement, 3-D electromagnetic simulation, and the proposed RLGC model, respectively. Their insertion losses are comparable up to 20 GHz. Furthermore, the obtained eye diagrams are almost identical at the data rate of 9.6 Gb/s. In conclusion, this paper successfully proposes, verifies, and characterizes a new coaxial silicone rubber socket for the first time.</P>
Park, Junyong,Choi, Sumin,Kim, Jonghoon J.,Kim, Youngwoo,Lee, Manho,Kim, Heegon,Bae, Bumhee,Song, Huijin,Cho, Kyungjun,Lee, Seongsoo,Lee, Hyunsuk,Kim, Joungho [Institute of Electrical and Electronics Engineers 2018 IEEE transactions on electromagnetic compatibility Vol.60 No.5
<P>This paper, for the first time, proposes a novel stochastic model-based eye-diagram estimation method for 8B/10B and transition-minimized differential signaling (TMDS)-encoded high-speed channels. A stochastic model describes a behavior of an encoder with respect to probability. The previous eye-diagram estimation methods are based on an assumption that each bit has the same probability for 1 s and 0 s. However, the assumption limits to estimate an accurate eye-diagram for encoded high-speed channels. We first propose and apply the stochastic model for two types of 8B/10B encodings: 8B/10B and TMDS. For verification, we design the 8B/10B and TMDS encoder within MATLAB. The transient simulation for the 8B/10B encoded channels requires 9700 and 6600 s, respectively. However, the proposed method only requires 23 s in both cases. Furthermore, in the bit-error rate, the transient simulation provides the bathtub curve up to <TEX>${10^{ - 2}}$</TEX> due to processing time and computing resources. In contrast, the proposed method with the stochastic model provides the bathtub curve up to <TEX>${10^{ - 8}}$</TEX>. In conclusion, this paper successfully proposes and verifies the stochastic model-based eye-diagram estimation method for 8B/10B-encoded high-speed channels.</P>
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.
Medical treatment of osteoarthritis: botanical pharmacologic aspect
( Junyong Park ),( Sung Won Lee ) 대한류마티스학회 2024 대한류마티스학회지 Vol.31 No.2
Osteoarthritis (OA) is the most common form of arthritis, and its prevalence is expected to further increase as our society ages. Despite many approaches to cure OA, no drugs are currently proven to modulate the progression of OA. Nowadays, new OA treatment options are holistically developed and one of the approaches of treatment option is botanical drugs. Some botanical drugs for OA have shown both therapeutic effect comparable to refined drugs in small studies and fewer side effects. Hence, there are various health functional foods which are known to relieve symptoms of OA. However, since there are many botanical products, clinicians are not familiar to the efficacy of each botanical product, making it challenging to use them appropriately in clinical practice. Here, we summarize the botanical products available for treating OA, including prescription botanical drugs and health functional foods available in Korea. Further studies and the purification of effective molecules from botanical products will be necessary in future.
Diagnosis of the Status of the ROK–U.S. Alliance and Suggestions for Policy Direction
Junyong Park 한국국방연구원 2023 The Korean Journal of Defense Analysis Vol.35 No.3
In late April this year, President Yoon visited the United States as a national guest. He emphasized the ROK–U.S. alliance and mentioned the word “alliance” 28 times during his speech to Congress. He explained how the alliance was formed and how it has developed so far. He also suggested a blueprint for the alliance and showed us a future direction and vision. His speech was touching and heart-fluttering since the alliance made a miracle of freedom and prosperity in South Korea. Nothing in the world, however, is perfect. Everything has its shortcomings and complements. From this perspective, this paper is for diagnosis of the current status of the ROK–U.S. alliance and suggestions for policy direction. Although the appearance of the alliance looks good, there are a couple of problems inside. This paper will examine various issues based on the alliance theories such as the security–autonomy exchange, balancing and bandwagoning theory, and alliance dilemma. The issues will be the transition of wartime operational control, integrated deterrence and Indo–Pacific strategy, and controversy over the effectiveness of extended deterrence. The paper will analyze whether the current government’s stance on the issues is helpful for national interests and suggest how we can improve policy directions way ahead. First, efforts for early transfer of wartime operational control are needed. Second, South Korea should expand its role as a global pivotal country since it openly exclaimed that in its Indo–Pacific Strategy of freedom, peace, and prosperity. Last but not least, South Korea should also strengthen its independent deterrence and response capabilities.
Park, Junyong,Park, Jae Hong,Kim, Eunhye,Ahn, Chi Won,Jang, Hyun Ik,Rogers, John A.,Jeon, Seokwoo WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.7
<P><B>Defect‐free and dense micropillar arrays with a high aspect ratio</B> are replicated from etched Si masters using high‐modulus polyurethane acrylate. The newly designed conformable solid‐index mask can generate high‐resolution 3D nanostructures that can be patterned through proximity field nanopatterning (PnP) in a single exposure step. The superb optical property proves the quality of 3D nanostructures. </P>
Junyong Park,Jeong Whan Yoon 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.12
A constitutive model for unidirectional fiber reinforced composite is proposed to utilize three-dimensional finite element simulation. This proposed model is developed based on two-dimensional Hashin criteria and Lapczyk damage model which are built in the commercial software ABAQUS. In this work, it is presented a new approach to calculate the damage variable incrementally, and is extended to the 3D constitutive model using the property of transverse isotropy to define the corresponding damage variable. In the validation, the proposed 3D model is compared with the results of the original 2D plane stress model for the proportional loading conditions with one element. To test general 3D problems, a notch laminate problem and ballistic example are modelled. In this process, it is discussed the necessity of the 3D constitutive model.