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Chung, Joonho,Kim, Moon Hang,Yoon, Yong Je,Kim, Kil Hwan,Park, So Ra,Choi, Byung Hyune Journal of Neurosurgery Publishing Group 2014 Journal of Neurosurgery: Spine Vol.21 No.6
<B>Object</B><P>This study investigated the effects of granulocyte colony-stimulating factor (G-CSF) on glial scar formation after spinal cord injury (SCI) in rats and compared the therapeutic effects between G-CSF and granulocytemacrophage colony-stimulating factor (GM-CSF) to evaluate G-CSF as a potential substitute for GM-CSF in clinical application.</P><B>Methods</B><P>Rats were randomly assigned to 1 of 4 groups: a sham-operated group (Group 1), an SCI group without treatment (Group 2), an SCI group treated with G-CSF (Group 3), and an SCI group treated with GM-CSF (Group 4). G-CSF and GM-CSF were administered via intraperitoneal injection immediately after SCI. The effects of G-CSF and GM-CSF on functional recovery, glial scar formation, and axonal regeneration were evaluated and compared.</P><B>Results</B><P>The rats in Groups 3 and 4 showed better functional recovery and more decreased cavity sizes than those in Group 2 (p < 0.05). Both G-CSF and GM-CSF suppressed intensive expression of glial fibrillary acidic protein around the cavity at 4 weeks and reduced the expression of chondroitin sulfate proteoglycans (p < 0.05). Also, early administration of G-CSF and GM-CSF protected axon fibers from destructive injury and facilitated axonal regeneration. There were no significant differences in comparisons of functional recovery, glial scar formation, and axonal regeneration between G-CSF and GM-CSF.</P><B>Conclusions</B><P>G-CSF suppressed glial scar formation after SCI in rats, possibly by restricting the expression of glial fibrillary acidic protein and chondroitin sulfate proteoglycans, which might facilitate functional recovery from SCI. GM-CSF and G-CSF had similar effects on glial scar formation and functional recovery after SCI, suggesting that G-CSF can potentially be substituted for GM-CSF in the treatment of SCI.</P>
On the Thermal Attack in Instruction Caches
Joonho Kong,John, Johnsy K,Eui-Young Chung,Sung Woo Chung,Jie Hu IEEE 2010 IEEE transactions on dependable and secure computi Vol.7 No.2
<P>The instruction cache has been recognized as one of the least hot units in microprocessors, which leaves the instruction cache largely ignored in on-chip thermal management. Consequently, thermal sensors are not allocated near the instruction cache. However, malicious codes can exploit the deficiency in this empirical design and heat up fine-grain localized hotspots in the instruction cache, which might lead to physical damages. In this paper, we show how instruction caches can be thermally attacked by malicious codes and how simple techniques can be utilized to protect instruction caches from the thermal attack.</P>
Symptomatic Sinus Pericranii with Adult Onset Headache : A Case Report with Pathologic Perspective
Young Soo Chung,Jung-jae Kim,Se Hoon Kim,Joonho Chung,Jae Whan Lee,Keun Young Park 대한뇌혈관외과학회 2019 Journal of Cerebrovascular and Endovascular Neuros Vol.21 No.3
Sinus pericranii (SP) is a rare vascular anomaly of the scalp that consists of an abnormal pericranial venous channel connected to adjacent dural venous sinuses. Most SP are asymptomatic and are found in the pediatric age group. We aim to report a case of symptomatic SP in adult and describe the clinical, radiological, and pathohistological findings to help understand and differentiate this lesion from other scalp lesions. A 40-year-old man with a scalp mass was admitted to our hospital complaining of headache. The lesion enlarged when the patient was in a recumbent position or during Valsalva maneuver. The radiologic imaging suggested its diagnosis as an accessory type of SP with bone erosion. Surgical resection and cranioplasty were successfully performed, and the related headache also gradually subsided. At the 3-year follow-up, there was no recurrence on magnetic resonance imaging.
Fine-Grain Voltage Tuned Cache Architecture for Yield Management Under Process Variations
Joonho Kong,Yan Pan,Ozdemir, S.,Mohan, A.,Memik, G.,Sung Woo Chung IEEE 2012 IEEE transactions on very large scale integration Vol.20 No.8
<P>Process variations cause large fluctuations in performance and power consumption in the manufactured chips, which eventually results in yield losses. In this paper, to mitigate access time failures and excessive leakage in caches, we propose a novel selective wordline boosting mechanism combined with SRAM cell arrays voltage lowering. Based on our evaluation, the proposed approach recovers up to 83.1% of the yield losses.</P>
Chung, Young-Seek,Lee, Yoonju,So, Joonho,Kim, Joonyeon,Cheon, Chang-Yul,Lee, Byungje,Sarkar, Tapan K. Wiley Subscription Services, Inc., A Wiley Company 2007 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.49 No.11
<P>In this article, we propose a new stable solution for the time domain electric field integral equation (TD-EFIE) for arbitrarily shaped conducting structures, which utilizes weighted Laguerre polynomials as temporal basis functions, which means that the unknown surface currents are expanded by these basis functions. The proposed algorithm is based on the Galerkin's scheme that involves separate spatial and temporal testing procedures. By introducing the temporal testing procedure, the conventional marching-on in time procedure can be replaced by a recursive relation between the different orders of the weighted Laguerre polynomials. In this article, by deriving the integral formulation using the weighted Laguerre polynomials, we solve for the surface current density as the unknown directly. To verify the accuracy of the proposed method, we have compared the results with the inverse discrete Fourier transform of the frequency domain solutions for the electric field integral equation. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2789–2793, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22835</P>
중장비용 사판식 유압펌프 요소부품의 Tribology 특성 연구
서준호(JoonHo Seo),나병철(ByungChul Na),김진용(JinYoung Kim),박승욱(SeungUk Park),정진은(JinEun Chung) 한국트라이볼로지학회 2005 한국트라이볼로지학회 학술대회 Vol.2005 No.6
The technologies of the swash plate type piston pump for heavy equipment are requiring high speed, high pressure, low noise level and mechanical efficiency. especially, It is need that improvement of materials and equipment for high pressure. So far, standard wear testing has been used for analysis of tribological characteristics. But it is different that running condition of piston pump. In this study through conducting the non-standard fretting type wear testing, the different materials has been used to consider tribological characteristics of swash plate type piston pump. We have changed the impact force conditions in this test and found out trend that work rate and friction coefficient of wear parts. It was found that work rate of each wear parts increased with increasing impact force, however friction coefficient was decreased with increasing impact force.