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( Sanghyeok Park ),( Joonho Byun ),( Sang Woo Song ),( Young-hoon Kim ),( Chang-ki Hong ),( Jeong Hoon Kim ) 대한뇌종양학회 대한신경종양학회 2021 Brain Tumor Research and Treatment Vol.9 No.2
Pulmonary blastoma is a rare type of primary lung cancer that accounts for only 0.25%-0.5% of all lung malignancies. Pulmonary blastoma consists of three subgroups: classic biphasic pulmonary blastoma (CBPB), pleuropulmonary blastoma, and well-differentiated fetal adenocarcinoma. Due to the rarity of the tumor, metastatic brain tumor from CBPB is extremely rare, and only 13 cases, including our case, have been reported. A 60-year-old woman who underwent left upper lobectomy of the lung because of pathologically diagnosed as CBPB 5 months ago, suddenly lost consciousness and presented with stupor mental status. The emergent CT scan showed a large, 51 mL, intracerebral hemorrhage on left parieto-occipital lobe with midline shifting. The patient underwent emergent craniotomy, and a hypervascular tumor was identified during the operation. Histopathologic examination reported metastatic pulmonary blastoma, CBPB. The patient has been in a vegetative state, but there has been no evidence of recurrence over a 6-month follow-up period. We report a rare case of brain metastasis from CBPB presenting with altered mentality due to massive tumor bleeding. This is the only reported case of brain metastasis from CBPB presenting with acute intracerebral hemorrhage.
Quality Characteristics of Plant-Based Rice Milk Using Processed and Functional Varieties
Sanghyeok Park,Gi Un Seong,Ji Yoon Lee,Ju Won Kang,Jiyoon Kim,Jungsoo Kim,Seoul Jeong,Jun Hyeon Cho,Kwang Deog Moon 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
In recent years, many rice varieties with improved processing quality have been developed to promote domestic rice consumption, in addition to the increasing preference for plant-based food and by-products. For quality test of rice milk, we used a set of rice lines, ‘Milyang355’ (aromatic brown rice, ABR; and aromatic white rice, AWR), ‘Milyang365’ (black rice, PBR) and ‘Saeilmi’ (normal brown rice, NBR; and white rice, NWR). Our preliminary data indicate that the viscosity and antioxidant activity (DPPH radical scavenging, TPC) of plant-based rice milk were significantly high in the brown rice group compared to the white rice group (p<0.05). In addition, the total soluble solid content was low in ARB. Whereas, the PBR (black rice) had the lowest L* value. In the sensory evaluation, the aromatic rice ABR had the highest overall preference, and high score for rice flavor, taste and texture; while, the black rice PBR recorded the lowest preference. Thus, this preliminary investigation provides helpful information that aromatic brown rice (ABR) present the best processing qualities and could be used in preference for plant-based rice milk making.
시간 길이가 다른 과목들의 시간표 작성을 위한 그래프 칼라링 알고리즘 개발
박상혁(Park Sanghyeok),안종일(Ahn Jongil),김명재(Kim Myungjae),정태충(ChungTaechoong) 한국정보과학회 1996 한국정보과학회 학술발표논문집 Vol.23 No.2A
최적화 기법 중의 하나인 그래프 칼라링 알고리즘은 시간표 문제 해결에 적용이 가능하다. 하지만, 기존의 알고리즘은 문제의 영역이 제한적이기에 다양한 시간표 문제에 적용하고자 할 경우 많은 제약이 뒤따른다. 본 연구에서는 먼저 배정될 과목의 시간 길이가 다른 경우를 고려하도록 문제 영역을 확장 시킨 후 보다 일반화된 시간표 문제에도 적용할 수 있도록, 문제 영역의 휴리스틱 정보를 이용한 효율적인 그래프 칼라링 알고리즘을 제안하고 실험하였다.
확장성 내시경 수술 후 발생한 2-3등급 뇌척수액 유출을 막기 위한 두개저 재건술 시 요추 배액법과 하이드록시아파타이트 방법의 비교 분석
박상혁(Sanghyeok Park),김지희(Ji Heui Kim),김용휘(Yong Hwy Kim),김영훈(Young-Hoon Kim) 대한두개저학회 2020 대한두개저학회지 Vol.15 No.1
Background : Although the skull base reconstruction to prevent cerebrospinal fluid (CSF) leakage is extremely critical for the extended endoscopic approach (EEA), The purpose of this report is to evaluate the clinical outcome of skull base reconstruction methods after EEA. Methods : The consecutive 62 cases with grade 2 or 3 CSF leakage after EEA at Asan Medical Center were enrolled in this study. Preoperative diagnosis of the patients included 19 pituitary adenomas (30.7%), 14 meningiomas (22.6%), 9 craniopharyngiomas (14.5%), 9 sinonasal malignancies (14.5%), 6 Rathke’s cleft cysts (9.7%), and 4 chordomas (6.5%). The vascularized nasoseptal flap was used in all cases. We performed the CSF lumbar drainage after surgery (L-method) in 30 patients (48.4%) and applied the injectable hydroxyapatite cement for skull base reconstruction without L-drainage (H-method) in 28 patients (45.2%). The clinical outcomes and risk between the L- and H-method were assessed and compared each other. Results : The overall reconstruction-related complication and CSF leakage rates were 12.9% (8/62) and 8.1% (5/62). The complication and CSF leakage rates of the L-method (10.0% and 6.7%, respectively) and the H-method (17.9.% and 10.7%, respectively) were not significantly different (P = 0.386 and 0.583, respectively). While all infections occurred only in the H-method (P = 0.066), the postoperative hospital stay was significantly shorter in the H-method (7.9 ± 2.9 days) than that of the L-method (10.8 ± 6.2 days) (P = 0.035). Conclusions : The skull base reconstruction method using the hydroxyapatite effectively prevented the CSF leakage and provided comfort and shorter hospitalization to patients without postoperative lumbar drainage. When using the hydroxyapatite, however, the postoperative infection should be considered.
범용 CMOS 공정을 사용한 DTMOS 슈미트 트리거 로직의 구현을 통한 EM Immunity 향상 검증
박상혁(SangHyeok Park),김소영(SoYoung Kim) 한국전자파학회 2016 한국전자파학회논문지 Vol.27 No.10
슈미트 트리거 로직(Schmitt Trigger Logic)은 디지털 회로의 노이즈에 대한 내성을 향상시키기 위해 히스테리시스 특성을 보이는 게이트를 제안한 설계 방법이다. 슈미트 트리거 특성을 보이는 설계 방법 중 최근에 제안된 substrate bias를 조정하여 구현하는 Dynamic Threshold voltage MOS(DTMOS) 방법을 사용할 경우, 게이트 수를 늘이지 않고 내성을 향상시킬 수 있는 설계방법이나, 범용 CMOS 공정에서 구현하여 시뮬레이션으로 예상하는 성능을 얻을 수 있는지는 검증되지 않았다. 본 연구에서는 0.18 μm CMOS 공정에서 DTMOS 설계 방법을 구현하여 히스테리시스 특성을 측정하여 검증하였다. DTMOS 슈미트 트리거 버퍼, 인버터, 낸드, 노어 게이트 및 간단한 디지털 로직 회로를 제작하였으며, 히스테리시스 특성, 전력 소모, 딜레이 등의 특성들을 관찰하고, 일반적인 CMOS 게이트로 구현된 회로와 비교하였다. 노이즈에 대한 내성이 향상되는 것을 Direct Power Injection(DPI) 실험을 통해 확인하였다. 본 논문을 통해 제작된 DTMOS 슈미트 트리거 로직은 10 M~1 GHz 영역에서 전자파 내성이 향상된 것을 확인할 수 있었다. Schmitt Trigger logic is a gate level design method to have hysteresis characteristics to improve noise immunity in digital circuits. Dynamic Threshold voltage MOS(DTMOS) Schmitt trigger circuits can improve noise immunity without adding additional transistors but by controlling substrate bias. The performance of DTMOS Schmitt trigger logic has not been verified yet in standard CMOS process through measurement. In this paper, DTMOS Schmitt trigger logic was implemented and verified using Magna 0.18 μm MPW process. DTMOS Schmitt trigger buffer, inverter, NAND, NOR and simple digital logic circuits were made for our verification. Hysteresis characteristics, power consumption, and delay were measured and compared with common CMOS logic gates. EM Immunity enhancement was verified through Direct Power Injection(DPI) noise immunity test method. DTMOS Schmitt trigger logics fabricated using CMOS process showed a significantly improved EM Immunity in 10 M~1 GHz frequency range.
Thermal degradation mechanism of ferritic alloy (Crofer 22 APU)
Park, Mansoo,Shin, Ji-Su,Lee, Sanghyeok,Kim, Hyo-Jin,An, Hyegsoon,Ji, Ho-il,Kim, Hyoungchul,Son, Ji-Won,Lee, Jong-Ho,Kim, Byung-Kook,Lee, Hae-Weon,Yoon, Kyung Joong Elsevier 2018 Corrosion science Vol.134 No.-
<P><B>Abstract</B></P> <P>The oxidation mechanism of Crofer 22 APU, one of the most preferred interconnects for solid oxide fuel cells (SOFCs), was explored in air. Crofer 22 APU showed two-step thermal behavior during thermal exposure, based on the varying growth rate of the chromia scale. The growth rate of the chromia scale abruptly increased at a certain annealed time, suggesting that its formation kinetics changed during thermal exposure. A thickness prediction model for the entire scale of Crofer 22 APU, based on the observed two-step oxidation mechanism, was established using the parabolic rate law.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The oxidation mechanism of Crofer 22 APU was investigated at high temperatures. </LI> <LI> The growth rate of chromia increased abruptly due to oxygen that penetrates the Cr-Mn oxide. </LI> <LI> Two-step thermal behavior for the growth of the scale was proposed. </LI> <LI> A thickness prediction model for the scale of Crofer 22 APU was established. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Park, Gyeong-Jae,Son, Byungkwan,Seo, SangHyeok,Lee, Ji-Han,Kim, Yong-Jae,Jung, Sang-Yong IEEE 2018 IEEE transactions on magnetics Vol.54 No.3
<P>Numerical analysis in frequency-domain guarantees convincing accuracy by reflecting non-linearity of material without massive computation time, combining advantages of the equivalent circuit method and numerical analysis method. However, at highly magnetic saturated regions where non-linearity of the material is severe, error in torque calculation is evident, as parameters in frequency domain are presumed to be in a sinusoidal condition. Many researchers have been suggested a compensating method by creating fictious material with logically modified <TEX>$B$</TEX>– <TEX>$H$</TEX> curve. Nevertheless, the error between the results of the numerical analysis in frequency-domain and time-domain analysis is not small enough to estimate motor characteristic. Therefore, the compensation method for improving accuracy on the estimation of induction motor characteristics is proposed in this paper. The numerical analysis based on finite-element method in frequency domain has been conducted using the proposed fictious material and the result is compared to those of the conventional methods and time-domain analysis to validate its improvement on accuracy.</P>