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- 저자 : Yoon Seokho (검색결과 260 건)
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Yoon, Seokho,An, Young-Sil,Lee, Su Jin,So, Eu Young,Kim, Jang-Hee,Chung, Yoon-Sok,Yoon, Joon-Kee Wolters Kluwer Health 2015 Medicine Vol.94 No.48
<P><B>Abstract</B></P><P><I>BRAFV</I>600E mutation and F-18 fluorodeoxyglucose (FDG) uptake are potential prognostic factors of papillary thyroid cancer (PTC). This study was performed to investigate the relationship between the <I>BRAFV</I>600E mutation and F-18 FDG uptake in PTC.</P><P>We retrospectively included 169 PTC patients who underwent F-18 FDG positron emission tomography/computed tomography (PET/CT) before thyroidectomy from May 2009 to August 2012. Subjects were classified into overt PTC (>1 cm, n = 76) and papillary thyroid microcarcinoma (PTMC, n = 93) groups. Univariate and multivariate analyses were performed to assess the relationship between maximum standardized uptake value (SUV<SUB>max</SUB>) of the primary tumors and clinicopathologic variables.</P><P>The <I>BRAFV</I>600E mutation was detected in 82.2% (139/169). In all subjects, the <I>BRAFV</I>600E mutation and tumor size were independently related to SUV<SUB>max</SUB> by multivariate analysis (<I>P</I> = 0.048 and <I>P</I> < 0.001, respectively). SUV<SUB>max</SUB> was significantly higher in tumors with the <I>BRAFV</I>600E mutation than in those with wild-type <I>BRAF</I> (9.4 ± 10.9 vs 5.0 ± 4.1, <I>P</I> < 0.001). Similarly, in overt PTC group, the <I>BRAFV</I>600E mutation and tumor size were independently correlated with SUV<SUB>max</SUB> (<I>P</I> = 0.032 and <I>P</I> = 0.001, respectively). By contrast, in PTMC group, only tumor size was significantly associated with SUV<SUB>max</SUB> (<I>P</I> = 0.010).</P><P>The presence of the <I>BRAFV</I>600E mutation is independently associated with high F-18 FDG uptake on preoperative PET/CT in patients with overt PTC, but this relationship was not evident in PTMC. This study provides a better understanding of the relationship between F-18 FDG uptake and <I>BRAFV</I>600E mutation in patients with PTC.</P>
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Seokho Yoon,Suk Chan Kim,Jun Heo,Iickho Song,Sun Yong Kim IEEE 2009 IEEE Transactions on Vehicular Technology VT Vol.58 No.4
<P>As a novel code-acquisition scheme, the twin-cell detection (TCD) is proposed for the acquisition in time of spread-spectrum codes in the presence of fractional Doppler frequency offset (FDFO). When the FDFO exists, the correlation peak that is used for detection during the acquisition process is split into two neighboring peaks with smaller magnitudes, which results in a considerable degradation in the overall acquisition performance of conventional schemes. In the TCD, the decision variable for detection is formed by combining two consecutive correlator outputs so that the influence of the reduction in the correlation peak due to the FDFO can be alleviated. The numerical results show that the TCD can offer a better mean-time-to-synchronization performance than the conventional scheme based on the cell-by-cell detection.</P>
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Analysis of Intersymbol Interference due to Overlap in DM-BPSK
YOON, Taeung,LEE, Youngpo,PARK, So Ryoung,KIM, Suk Chan,SONG, Iickho,YOON, Seokho The Institute of Electronics, Information and Comm 2010 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.93 No.5
<P>The relationship between the degree of overlap in direct modulation chirp spread spectrum systems with binary phase shift keying and intersymbol interference (ISI) is analyzed. It is observed that the ISI due to overlap fluctuates or monotonically increases as the number of overlaps changes and that, in some cases, the overlap does not incur ISI at all.</P>
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A Closed Form BER expression for an Overlap-based CSS System
Taeung Yoon,Seung Hwan Yoo,Sun Yong Kim,Seokho Yoon 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
Overlap is one of the techniques for increasing bit rate in CSS. More overlaps can offer higher data throughput; however, they may cause more intersymbol interference (ISI) at the same time, resulting in serious bit error rate (BER) performance degradation. This implies that the number of overlaps should be decided according to the required system performance. In this paper, we derive a closed form expression for BER of the overlap-based CSS system, which would be very helpful in setting the number of overlaps. The numerical results demonstrate that the BER derived in a closed form closely agrees with the simulated BER.
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의식적인 체간 근육의 활성화와 부하 수준이 스쿼트 동작 시 척추 분절의 자유도에 미치는 영향
윤석호 ( Seokho Yoon ),유제광 ( Jehkwang Ryu ) 한국스포츠심리학회 2020 한국스포츠심리학회지 Vol.31 No.4
목적: 본 연구의 목적은 의식적인 체간 근육의 동시 활성화(co-activation) 조건과 1RM(repetition max)의 50%, 65%, 80%의 부하 수준에서 바벨 백 스쿼트(barbell back squat)를 수행하였을 때, 척추 분절의 자유도의 변화 양상을 관찰하는 것이다. 방법: 이를 위하여 본인 체중의 1.8∼2배 이상으로 바벨 백 스쿼트를 수행할 수 있는 4명의 연구 참여자들에게 실험 조건에 따른 운동학적 자료를 수집한 뒤 주성분 분석(principal component analysis)을 사용하여 척추의 자유도를 정량화하였다. 결과: 전체 분산의 95% 이상을 설명할 수 있는 주성분의 개수(5개)를 기준으로 백 스쿼트의 하강 구간에서 의식적인 활성에 따라 통계적으로 유의미한 차이를 보였으며 상승 구간에서는 부하 조건에 따라 유의미한 차이를 보였다. 결론: 백 스쿼트의 하강 구간 동안 의식적인 체간 근육의 동시 활성화에 의해 척추 분절의 자유도가 제한될 수 있으며 상승 구간에서는 부하 수준에 따라 차이가 발생할 수 있다. Purpose: The purpose of the study was to observe the aspect of transition in degrees of freedom of spine segment while performing Barbell Back Squat on the load levels with 50%, 65%, and 80% of 1 repetition max (RM) in conscious co-contraction of torso-muscle conditions. Methods: Thus, we collected kinematic data of four participants, each of who could perform Barbell Back Squat over 1.8 to 2 times body weight, and quantified the degrees of freedom of the spine by using Principal Component Analysis (PCA). Results: Based on the number of principal components, which is 5, to account for more than 95% of the total variance, we discovered statistically significant differences in weighted variables within the principal components depending on conscious control in the descending phase of the squat and depending on the load levels during the ascending phase. Conclusion: The degrees of freedom of spine segment can be restricted due to conscious co-activation of torso-muscle during the descending phase of the squat while the degrees of freedom of spine segment differ based on the loading conditions during the ascending phase of the squat.
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