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Hemodynamic Analysis of Coronary Circulation in Angulated Coronary Stenosis Following Stenting
ByoungKwonLee,JuyongLee,BumKeeHong,ByoungEunPark,DongsooKim,Dong-YeonKim,Yun-HyeongCho,Se-JungYoon,YoungWonYoon,HyuckMoonKwon,Hyung-WoonRoh,IlKim,HyeWonPark,Seong-MinHan,Min-TaeCho,SangHoSuh,Hyun-Seun 연세대학교의과대학 2002 Yonsei medical journal Vol.43 No.5
Novel Cell Architecture for High Performance of 512-Mb DRAM with 0.12-㎛ Design Rule
JaegooLee,ChanghyunCho,JuyongLee,MinsangKim,JaekyuLee,SoohoShin,DonghwaKwak,KwanhyeobKoh,GitaeJeong,HongsikJeong,TaeyoungChung,KinamKim 한국물리학회 2002 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.41 No.4
In this research, the data retention time was investigated for a high-speed the 0.12-um, low power 512-Mb DRAM (Dynamic Random Access Memory) with 0.12 m design rule. As the technology generation of DRAM has been developed into sub-quarter micron region, the control of the junction leakage current at the storage node has become much more important due to the increased channel doping concentration. In order to obtain high-performance DRAM with the 0.12-m design rule, we propose a novel trench isolation (shallow trench isolation) using self-aligned local field implantation to improve the data retention-time characteristics and to minimize the narrow-width eect in the cell transistor. This scheme reduces both the cell junction leakage current and the capacitance by relaxing the abrupt junction prole at the source and the drain regions. The relaxed junction prole can reduce the electric eld strength of junction and, thus, improve the data retention-time characteristic of the DRAM. We also tried to cure the surface defect by using a gate dual spacer and downstream Si-treatment. A high capacitance is realized by the dual molded oxide capacitor process. This novel storage node structure gives the capacitor much better mechanical stability. With the novel cell architecture, dramatic increases in the data retention time and the device yield were obtained for a 512-Mb DRAM. The proposed cell architecture can be extended fairly well to future high-density DRAM in 0.10 m technology and beyond.
Ju Yong Lee,Hyuck Moon Kwon,Bum Kee Hong,Hae Kyoon Kim,Ki Whan Kwon,Jae Young Kim,Kyo Jun Lee,Tae Soo Kang,Dong Soo Kim,Young Hak Shin,Jin Seon Leem,Hyun Seung Kim 대한내과학회 2001 The Korean Journal of Internal Medicine Vol.16 No.4
A 34-year-old woman was admitted to the hospital because of recently aggravated right heart failure without angina for 5 months. When she was 25 year sold, patch repair with Polytetrafluoroethylene (PTFE) was performed for the secondum type of atrial septa
Radon Exhalation from Five Wood Species
( Ju Yong Lee ),( Gyu Woong Choi ),( Seog Goo Kang ) 한국목재공학회 2018 목재공학 Vol.46 No.6
Radon radiation exposures in home have been posed as a potential cancer hazard. This research aims to present the basic data of the indoor radon concentration level by examining the radon exhalation rates of wood species. Radon exhalation rates from five commonly used wood species in Korean wood building construction were measured with Continuous Radon Monitor (CRM), Model 1028 (Sun Nuclear Co., USA) using the Closed Chamber Method (CCM). The mass exhalation rate was observed to vary from 0.00089 Bq·kg<sup>-1</sup>·h<sup>-1</sup> to 0.00181 Bq·kg<sup>-1</sup>·h<sup>-1</sup>, whereas the surface exhalation rate was observed to be 0.00677 - 0.01517 Bq·m-2·h-1. The radon exhalation rate of Quercus accutissima Carruth (white oak) which has the highest density showed the highest figure among the five wood species, on the other hand, the rest of four species showed similar results which were similar to the radon exhalation rates of wood in the U.S.A. and Canada. The average of the concentration measured by the CCM represented well up to the second half-life period (7.7 days). Because result of these small quantities seems to indicate that radon exhalation from the tested wood species has almost negligible impact, the main culprit of the high indoor radon concentration is clearly derived from the background of surrounding wood house. Therefore, as a safety precaution, infrastructures made of wood materials should be designed with the consideration of influx of radon and built accordingly. Furthermore, it is highly desirable that wood will be needed to use for furniture and interior finishing material in indoor environment.
Dynamic Parameter Adaptation for M-LWDF/M-LWWF Scheduling
Ju Yong Lee,Sorour, S.,Valaee, S.,Wonyoung Park IEEE 2012 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.11 No.3
<P>M-LWWF/M-LWDF scheduling schemes have attracted much interest due to their ability to both stabilize queues whenever possible and control delay through parameter selection. However, a good implementation of these schedulers would require a mechanism to minimize the required fraction of the bandwidth while satisfying its stability and delay requirements. To the best of our knowledge, previous works on these scheduling policies did not address the problem of minimizing the bandwidth utilization while satisfying delay constraints. In this paper, we explore the solution of this problem using a joint bandwidth and weight adaptation approach. We characterize the problem solution space for M-LWWF and M-LWDF scheduling, assuming time-varying traffic. We also show that, starting from any point in the solution space, simple dynamic bandwidth and weight updates can surely lead to the convergence to the optimal operation point in this space. Based on these characteristics, we propose a dynamic parameter adaptation algorithm that is able to track the time-varying optimal operation points for dynamic traffic and channel conditions. Simulation results show the efficiency of our proposed algorithm in tracking the optimal operation points in dynamic traffic and channel settings.</P>
Interference Analysis for Femtocell Deployment in OFDMA Systems Based on Fractional Frequency Reuse
Ju Yong Lee,Sueng Jae Bae,Young Min Kwon,Min Young Chung IEEE 2011 IEEE COMMUNICATIONS LETTERS Vol.15 No.4
<P>In OFDMA systems adopting fractional frequency reuse, we can allocate orthogonal bandwidth to femtocells, which mitigates throughput degradation of macrocell users. In this paper, we discuss the optimal power allocation for femtocells with different orthogonal subbands, based on analysis of macrocell interferences.</P>
( Ju Yong Lee ),( Seog Goo Kang ) 한국목재공학회 2021 목재공학 Vol.49 No.2
The radon gas from nature mainly considers a cause of radon problems, and it is closely affect human life cycle. Korean yellow residual soil, Hwangtoh, widely used as a building material, is considered to be one of major sources of indoor radon. However, there have, as yet, been no studies about radon from Hwangtoh in mass market brands. Here, we investigated the indoor radon concentrations and exhalation rates in four Hwangtohs from different brand names and regional features. The Closed Chamber Method (CCM) conducted by a Continuous Radon Monitor (CRM) has been used for the rates of radon exhalation. Based on equations of previous references, the indoor radon concentrations were deducted. As a result, the radon surface exhalation rates resulted in the 1.4208 to 3.0293 Bq·㎡·h<sup>-1</sup> range. Significant differences were found among Hwangtohs according to production regions. Materials with higher radon concentration required a longer time to reach a quasi-steady state in a given environment, in other words, the number of half-life cycles increased from a set starting point. The experimentally identified Hwangtohs demonstrated its safety for construction purposes. There exists, so far, a possibility to exert influence radon emanation due to unidentified factors. Therefore, it is necessary to corroborate with more research by increasing the number of Hwangtohs, considering the other references reported high radon exhalation rates. In addition, it is highly recommended that the radon exhalation rates should be measured for all building materials for preventing human health before the material usage.