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조학현 木浦海洋大學校 2001 論文集 Vol.9 No.2
The communication system by the conventional SSB and VHF transceivers between a coast station and a terminal is an one-to-one system. In this dissertation, however, the conventional one-to-one system is expanded to one-to-multiple systems. Then, frequencies can be used effectively for distress, urgency, safety traffic, and military communications. An ICS has been proposed and added, in this dissertation, to the conventional SSB and VHF communication systems, which can realize one-to-several terminal communications. The line switching system by the ICS is to be remote-controlled by ASK modulated PTT signals and audio signals. An ICS can change a connection between terminal and transceiver through a circuit switching system at any time. For this purpose, the author has researched and developed a ASK transmission system, ICS system, control algorithm, multiprocessor system, and monitoring system. As a conclusion, the developed line switching control systems and equipments can be used effectively for maritime communication, military communication, fishery communication, etc.
정병천,배호상,곽동훈,김영태,배용학,황종현,임현주,류재근,조용근,채성철,전재은,박의현 慶北大學校 醫科大學 1997 慶北醫大誌 Vol.38 No.2
목적 : 급성하벽심근경색증 환자에서 심전도상 흔히 동반되는 전흉부유도 ST절 하강의 의의를 알아보았다. 방법 : 심근경색후 24시간에서 48시간에 얻은 심전도를 기준으로 52명의 급성하벽심근경색증 환자를 전흉부유도에서 ST절의 하강이 있는 군과 없는 군으로 나누었으며 심도자, 관상동맥조영술, 심초음파도 및 방사성 핵종을 이용한 좌심구혈율 측정 등을 시행하였다. 결과 : 1) 좌심실확장기말압은 전흉부유도에서 ST절의 하강이 있는 경우에서 16.9±5.33mmHg로 없는 경우의 11.0±4.02mmHg보다 유의하게 높았다(p<0.05). 그러나 운동량 및 좌심구혈을은 흥부 유도상 ST절의 하강이 있는 경우 7.6±3.0 METs 및 53.9±9.1%로 없는 경우의 9.1±2.7 METs 및 54.6±9.5%보다 낮았으나 통계적 유의성은 없었다(p=0.180, p=0.823). 2) 관상동맥조영술상 전흉부 ST절의 하강이 동반된 군에서는 유의한 좌전하행지나 좌회선지의 협착이 있는 경우가 60.9% 및 57.9%로 ST절의 하강이 없는 군에서의 34.5% 및 7.7%와 비교해 좌관상동맥에 협착이 동반된 경우가 많았다(p=0.050, p=0.001). 3) 관상동맥조영술상 세 혈관질환의 빈도는 흉부유도상 ST절의 하강을 보인 23예에서 10예로 ST절 하강이 없었던 29예중 2예에 비하여 유의하게 많았고(P=0.007), 단 혈관질환의 빈도는 ST절의 하강을 보인 군에서 23예중 5예로 ST절 하강이 없었던 29예중 17예에 비하여 유의하게 적었다(P=0.002). 두 혈관질환의 경우에는 각각 8예와 10예로 양군간에 유의한 차이가 없었다. 4) 흉부유도상 ST절 하강의 빈도는 단 혈관질환 22예 중 5예에서, 두 혈관질환 18예중 8예, 세 혈관질환 12예 중 10예에서 관찰되어 협착이 있는 관상동맥의 수가 많을수록 ST절의 하강이 나타나는 빈도가 많음을 보였다(p=0.00308). 그러나 흉부유도상 나타난 ST절의 하강을 모두 합하여 구한 ST절 하강의 합은 협착이 있는 관상동맥의 수와 통계적인 유의성이 없었다. 5) 심초음파도상 좌심실 하벽의 벽운동은 ST절 하강을 보인 군에서는 akinesia가 83.3%, hypokinesia가 11.1%, 정상 벽운동이 5.6%로, ST절 하강이 없었던 군에서의 dyskinesia가 3.6%, akinesia가 39.3%, hypokinesia가 25.0%, 정상 벽운동이 32.1%와 비교하여 ST절의 하강이 있는 군에서 유의하게 벽운동의 장애가 빈번함을 보였다(p=0.03891). 그러나 좌심실전벽, 측벽 및 중격부위에서는 유의한 벽운동의 차이가 없었다. 결론 : 급성하벽심근경색증 환자의 전흉부유도에서 ST절의 하강이 동반되는 경우 다혈관 질환의 가능성이 높으며 좌심실확장기말압이 상승되었고 운동능력은 감소되어 있었다. 또한 심초음파도상 좌심실하벽의 벽운동장애도 심하였다. 따라서 전흉부 ST절의 하강을 동반한 급성하벽심근경색증 환자는 전흉부유도에 ST절 하강이 없는 경우보다 예후가 불량할 것으로 생각되며, 보다 적극적인 치료가 필요할 것으로 생각된다. The purpose of this study was to determine the significance of precordial ST segment depression appearing during acute inferior myocardial infarction and to assess the correlation of that with angiographic finding. 52 patients were allocated into two groups based on the existence of precordial ST segment depression : 23 patients with ST segment depression and 29 patients without ST segment depression. The extent of coronary artery disease as well as the prevalence of significant stenosis (≥70%) in left anterior descending artery were more frequent in patients showing precordial ST segment depression than in patients not showing them (p=0.050) and the result were similar in cases of left circumplex artery (p=0.001). On echocrdiographic examination of left ventricular (LV) wall motion, it showed more severely decreased inferior LV wall motion in patients showing precordial ST segment depression than in patients not showing them (p=0.03891) even though the other segment of LV wall motion didn't show the statistical difference between both groups. The other cardiac parameters such as LVEDP, exercise amount (METs) and ejection fraction were tend to showing bad profile in patients with precordial ST segment depression. From the above results, we could deduce that patients with precordial ST segment depression have relatively large infarction or concomitant left coronary artery disease, so they need more caution and intensive theraphy.
One-step etching, doping, and adhesion-control process for graphene electrodes
Jo, Kyungmin,Kim, Sang-Min,Lee, Seung-Mo,Kim, Jae-Hyun,Lee, Hak-Joo,Kim, Ki Soo,Kwon, Yong Duck,Kim, Kwang-Seop Elsevier 2015 Carbon Vol.82 No.-
<P><B>Abstract</B></P> <P>Enhancing the electrical conductivity and reliability of graphene electrodes is critical for the practical realization of graphene-based electronics, since these factors influence the electrical performance of devices. To achieve such improvements in graphene electrodes requires additional processes such as doping and surface treatments, which inevitably complicate device fabrication. Here, we introduce a novel, straightforward one-step etching method, in which a catalytic copper substrate is etched in imidazole-containing ammonium persulfate solution, of simultaneously enhancing the electrical and adhesion properties of graphene grown on copper foil by chemical vapor deposition. Applying one-step etching method, the sheet resistance of monolayer graphene with 270Ω/sq is obtained, while the adhesion of graphene is improved by 20%. Moreover, the electrical conductivity of graphene remained improved after storage for 30days in ambient conditions without any passivation layers, and the graphene was almost transparent with transmittance of 97.7% at 550nm. The enhancement of the electrical and adhesion properties of graphene originated from the synergistic adsorption of imidazole and etched Cu ions, which results in p-doping of graphene.</P>
Jo, Kyungmin,Lee, Sangbong,Kim, Sang-Min,In, Jung Bin,Lee, Seung-Mo,Kim, Jae-Hyun,Lee, Hak-Joo,Kim, Kwang-Seop American Chemical Society 2015 Chemistry of materials Vol.27 No.10
<P>Fabrication of a transparent and flexible supercapacitor requires electrode materials that are optically transparent and mechanically flexible. Although chemical vapor deposition (CVD)-grown graphene is a promising electrode material, its use in supercapacitor applications is greatly limited by the low area-specific capacitance of the fabricated supercapacitor. Here, we demonstrate transparent and flexible high-performance supercapacitor using stacked bilayer graphene and an ultrathin redox-active interlayer. By inserting the redox-active layer between stacked bilayer graphene, we achieved an almost 20-fold enhancement of the area-specific capacitance (from 5.6 μF/cm<SUP>2</SUP> to 101 μF/cm<SUP>2</SUP>) with a thickness of electrode material for each electrode less than 2 nm. In addition, the fabricated supercapacitor exhibited excellent transparency of 75% (including the substrate’s transparency) and flexibility (bending radius down to 5 mm) by virtue of the outstanding transparency and flexibility of the stacked bilayer graphene and redox-active interlayer.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2015/cmatex.2015.27.issue-10/cm504801r/production/images/medium/cm-2014-04801r_0003.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cm504801r'>ACS Electronic Supporting Info</A></P>
Torsion of corpus luteum cyst in the second trimester of normal pregnancy : A case report
( Hyun Kyoung Seo ),( Seon Mi Lee ),( Jae Yoon Jo ),( Hee Jung Lee ),( Yeon Jee Lee ),( In Ae Cho ),( Jeong Kyu Shin ),( Won Jun Choi ),( Jong Hak Lee ),( Won Young Paik ),( Soon Ae Lee ) 대한산부인과학회 2020 대한산부인과학회 학술대회 Vol.106 No.-
Torsion of corpus luteum cyst is rare case of gynecologic surgical emergency during pregnancy. The patient of adnexa torsion complain non-specific symptom such as abdominal pain, palpable mass, nausea, vomiting, and abdominal distension. So. It makes the differential diagnosis difficulty. Ovarian torsion cause venous and lymphatic compression and hemorrhagic ischemia, lead to ovarian stroma necrosis. Early detection and treatment is crucial to maintain pregnancy and preserve fertility. We report here a case of 32-year old women with 17+2 weeks of pregnancy with left lower abdominal pain. And she complain nausea and vomiting. The patient was diagnosed with a left ovarian torsion, and we performed surgical treatment. After surgery, we confirmed that the fetal heart tone was normal. If ovarian torsion is left untreatened, it may cause problems in fetal well-being and complications such as peritonitis. Therefore, a reasonable discrimination by the surgeon is essential when the patient with acute abdominal pain during pregnancy. Transabdominal sonography, including color Doppler can help with the diagnosis of ovarian torsion. MRI also help diagnose this disease without the risk of fetal radiation exposure. In general, treatment of ovarian torsion is laparoscopic surgery, but treatment of adnexa torsion during pregnancy should be assessed by gestational age and the fetal condition.