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RISS 인기검색어
- 검색키워드
- 저자 : Min Gyung Kwak (검색결과 26 건)
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Kwak Yee Gyung,Song Je Eun,Oh Gang-Bok,Jeong In Hye,Cho Chong Rae,Kim Namhee,Yoo Hyeon Mi,Yoo Gyeong Min,Lee Myung Jin,김백남 대한감염학회 2020 Infection and Chemotherapy Vol.52 No.1
We performed a point seroprevalence survey of measles among healthcare workers (HCWs) at two Korean teaching hospitals in 2019. A total of 2,830 HCWs underwent an antibody test. The overall seropositivity of measles was 93.1%. The seroprevalence of measles was lowest in HCWs aged 20 - 24 years (81.2%), followed by those aged 25 - 29 years (90.1%). The rates of anti-measles IgG positivity were significantly different between the two hospitals (97.0% vs. 89.4%, P <0.001). These results suggest that the seropositivity of measles in HCWs may differ depending on the hospital's vaccination policy.
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Kwak, Chang-Min,Kim, Young-Tae,Park, Chan-Gyung,Seol, Jae-Bok Cambridge University Press 2017 Microscopy and microanalysis Vol.23 No.2
<B>Abstract</B><P>Two challenges exist in laser-assisted atom probe tomography (APT). First, a drastic decline in mass-resolving power is caused, not only by laser-induced thermal effects on the APT tips of bulk oxide materials, but also the associated asymmetric evaporation behavior; second, the field evaporation mechanisms of bulk oxide tips under laser illumination are still unclear due to the complex relations between laser pulse and oxide materials. In this study, both phenomena were investigated by depositing Ni- and Co-capping layers onto the bulk LaAlO3 tips, and using stepwise APT analysis with transmission electron microscopy (TEM) observation of the tip shapes. By employing the metallic capping, the heating at the surface of the oxide tips during APT analysis became more symmetrical, thereby enabling a high mass-resolving power in the mass spectrum. In addition, the stepwise microscopy technique visualized tip shape evolution during APT analysis, thereby accounting for evaporation sequences at the tip surface. The combination of “capping” and “stepwise APT with TEM,” is applicable to any nonconductors; it provides a direct observation of tip shape evolution, allows determination of the field evaporation strength of oxides, and facilitates understanding of the effects of ultrafast laser illumination on an oxide tip.</P>
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곽효성,한영민,임영수,전수빈,이상용,정경호,김종수,손명희,최기철 의과학연구소 1998 全北醫大論文集 Vol.22 No.1
1. Purpose : To evaluate of the effectiveness of bronchial arterial embolization acdording to the causess of hemoptysis. 2. Materials and methods : This study included 39 patients who had undertaken arterial embolization for the control of hemyptysis. The patinets were classified 1. Purpose: To evaluate of the effectiveness of bronchial arterial embolization according to the causes of hemoptysis. 2. Materials and methods: This study included 39 patients who had undertaken arterial embolization for the control of hemoptysis. The patinets were classified into the three groups: pulmonary tuberculosis (n=22), idiopathic bronchiectasis (n=10), lung cancer (n=7). Gelfoam particle were used as embolized material for all patients. And only for two patients, embolization coil was interpolated. The period of follow-u[ was from 1 to 66 months after arterial embolization. Immediate results were assessed based on careful observation of patients for 1 month after arterial embolization: success, indicating complete cessation of hemoptysis for 1 month: and fail, indicating continued hemoptysis or recurrent hemoptysis within 1 month. Long-term results were evaluated in patients with immediate success who could be followed for at least 1 month. Patients were classified into the three categories: complete remission, indicating complete cessation of bleeding during the observation period : partial remission, indicating complete cessation of hemoptysis with recurrent bloody sputum during the observation period : and recurrence, indicating recurrent hemoptysis. 3. Results : immediate success rate was 76.9%(30/39), and as classified into the causes, idiopathic bronchiectasis 90.0% (9/10), pulmonary tuberculosis 81.8% (18/22), lung cancer 42.9%(3/7). Long-term results in the causes of idiopathic bronchiectasis showed a high remission rate (77.8%), a low recurrence rate (22.2%). In pulmonary tuberculosis, remission rate was 70.8%m recurrence rate was 29.4%. No recurrence was observed in the cases of success of the lung cancer. During and after embolization, the complications were mild chest pain 1 or fever, which relieved spontaneously within a few days. 4. Conclusion : The benign diseases such as pulmonary tuberculosis and idiopathic bronchiectasis showed a high immediate success rate and a high long-term remission rate. The lung cancer showed a low immediate success rate. But during observation period, lung cancer showed no recurrence. (Key Words : Lung, hemorrhage, therapeutic, blockade)
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A Hybrid Upstream Bandwidth Allocation Method for Multimedia Communications in EPONs
Baek, Jinsuk,Kwak, Min Gyung,Fisher, Paul S. The Institute of Electronics and Information Engin 2012 IEIE Transactions on Smart Processing & Computing Vol.1 No.1
The Ethernet Passive Optical Network (EPON) has been considered to be one of the most promising solutions for the implementation of the Fiber To The Home (FTTH) technology designed to ameliorate the "last mile" bandwidth bottleneck. In the EPON network, an efficient and fair bandwidth allocation is a very important issue, since multiple optical network units (ONUs) share a common upstream channel for packet transmission. To increase bandwidth utilization, an EPON system must provide a way to adaptively allocate the upstream bandwidth among multiple ONUs in accordance to their bandwidth demands and requirements. We present a new hybrid method that satisfies these requirements. The advantage of our method comes from the consideration of application-specific bandwidth allocation and the minimization of the idle bandwidth. Our simulation results show that our proposed method outperforms existing dynamic bandwidth allocation methods in terms of bandwidth utilization.
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Hyo-Sung Kwak,Young-Min Han,Sang-Yong Lee,Ki-Nam Kim,Gyung Ho Chung 대한영상의학회 2006 Korean Journal of Radiology Vol.7 No.3
Objective: The purpose of this study was to demonstrate the ultrasonographic (US) findings of rupture and the healing process of the medial head of the gastrocnemius ("Tennis Leg"). Materials and Methods: Twenty-two patients (age range: 30 to 45 years) with clinically suspected ruptures of the medial head of the gastrocnemius were referred to us for US examination. All the patients underwent US of the affected limb and the contralateral asymptomatic limb. Follow-up clinical evaluation and US imaging of all patients were performed at two-week intervals during the month after injury and at one-month intervals during the following six months. Results: Of the 22 patients who had an initial US examination after their injury, partial rupture of the medial head of the gastrocnemius muscle was identified in seven patients (31.8%); the remaining 15 patients were diagnosed with complete rupture. Fluid collection between the medial head of the gastrocnemius and the soleus muscle was identified in 20 patients (90.9%). The thickness of the fluid collection, including the hematoma in the patients with complete rupture (mean: 9.7 mm), was significantly greater than that seen in the patients with partial tear (mean: 6.8 mm) (p < 0.01). The primary union of the medial head of the gastrocnemius with the soleus muscle in all the patients with muscle rupture and fluid collection was recognized via the hypoechoic tissue after four weeks. Conclusion: Ultrasonography is a useful imaging modality for the diagnosis and follow-up examination for the patients suffering with rupture of the medial head of the gastrocnemius.
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A Smart Backoff Scheme for Multicast Flows in Wireless LAN
Jinsuk Baek,Min Gyung Kwak,Paul S. Fisher 한국산학기술학회 2015 SmartCR Vol.5 No.3
In IEEE 802.11 wireless protocols, a multicast sender basically adopts a simple broadcasting mechanism to transmit multicast frames. As such, the multicast frames are locally transmitted at a low, fixed rate without any backoff process on the sender’s side or any feedback requirements on the receiver side. This simplicity reveals an unfairly shared channel access between unreliable multicast flows and reliable unicast flows. In this paper, we propose a novel backoff scheme for multicast frame retransmission. The proposed scheme has been strategically designed after considering the sources of multicast frame errors. We define two different types of NAK messages that include a NAK for a single frame error and a cumulative NAK for multiple continuous erroneous frames. For frame retransmission, the multicast sender is required to adaptively adjust its contention window size based on the NAKs sent by its local receiver. With the proposed scheme, we ultimately provide reliable local multicast transmission and a relatively fair channel sharing with low-priority unicast flows.
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Treatment of Malignant Biliary Obstruction with a PTFE-Covered Self-Expandable Nitinol Stent
Han, Young-Min,Kwak, Hyo-Sung,Jin, Gong-Yong,Lee, Seung-Ok,Chung, Gyung-Ho unknown 2007 KOREAN JOURNAL OF RADIOLOGY Vol.8 No.5
<P><B>Objective</B></P><P>We wanted to determine the technical and clinical efficacy of using a PTFE-covered self-expandable nitinol stent for the palliative treatment of malignant biliary obstruction.</P><P><B>Materials and Methods</B></P><P>Thirty-seven patients with common bile duct strictures caused by malignant disease were treated by placing a total of 37 nitinol PTFE stents. These stents were covered with PTFE with the exception of the last 5 mm at each end; the stent had an unconstrained diameter of 10 mm and a total length of 50-80 mm. The patient survival rate and stent patency rate were calculated by performing Kaplan-Meier survival analysis. The bilirubin, serum amylase and lipase levels before and after stent placement were measured and then compared using a Wilcoxon signed-rank test. The average follow-up duration was 27.9 weeks (range: 2-81 weeks).</P><P><B>Results</B></P><P>Placement was successful in all cases. Seventy-six percent of the patients (28/37) experienced adequate palliative drainage for the remainder of their lives. There were no immediate complications. Three patients demonstrated stent sludge occlusion that required PTBD (percutaneous transhepatic biliary drainage) irrigation. Two patients experienced delayed stent migration with stone formation at 7 and 27 weeks of follow-up, respectively. Stent insertion resulted in acute elevations of the amylase and lipase levels one day after stent insertion in 11 patients in spite of performing endoscopic sphincterotomy (4/6). The bilirubin levels were significantly reduced one week after stent insertion (<I>p</I> < 0.01). The 30-day mortality rate was 8% (3/37), and the survival rates were 49% and 27% at 20 and 50 weeks, respectively. The primary stent patency rates were 85%, and 78% at 20 and 50 weeks, respectively.</P><P><B>Conclusion</B></P><P>The PTFE-covered self-expandable nitinol stent is safe to use with acceptable complication rates. This study is similar to the previous studies with regard to comparing the patency rates and survival rates.</P>
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