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The Design of a Dual-Polarized Small Base Station Antenna With High Isolation Having a Metallic Cube
Jung-Nam Lee,Kwang-Chun Lee,Pyeong-Jung Song Institute of Electrical and Electronics Engineers 2015 IEEE Transactions on Antennas and Propagation Vol. No.
<P>A dual-polarized small base station antenna is presented that has a metallic cube and high isolation. The antenna is composed of a micro-strip feed line board, planar dipole radiators, micro-strip coupling feeds, a metallic cube, and a radome. The measured impedance bandwidth is 2.36-2.95 GHz at port-1 and 2.4-2.83 GHz at port-2. The proposed base station antenna has a high isolation of greater than 40 dB at the operating frequency. The measured peak gain is 9 dBi, and the cross polarizations are all less than 25 dB below the co-polarization level.</P>
Significance of Stent Abutment in Gastroduodenal Stent Placement for Gastric Outlet Obstructions
Park, Jung-Hoon,Kim, Guk Bae,Song, Ho-Young,Kim, Min Tae,Kim, Pyeong Hwa,Kim, Kun Yung,Tsauo, Jiaywei,Kim, Do Hoon RADIOLOGICAL SOCIETY OF NORTH AMERICA INC 2017 JOURNAL OF VASCULAR AND INTERVENTIONAL RADIOLOGY Vol.28 No.8
<P><B>Abstract</B></P> <P><B>Purpose</B></P> <P>To evaluate the frequency, severity, and clinical significance of stent abutment (SA) after gastroduodenal stent placement in patients with gastric outlet obstruction caused by unresectable gastric cancer.</P> <P><B>Materials and Methods</B></P> <P>A retrospective study was conducted in a single tertiary referral university hospital to identify the incidence and clinical significance of SA in 318 patients who underwent self-expandable metallic stent placement. SA was defined as abutment of the distal end of the stent to the duodenal wall and/or superior duodenal flexure. The outcomes included technical and clinical success, complications, repeat intervention, stent patency, and survival.</P> <P><B>Results</B></P> <P>A total of 318 patients, 107 with SA (33.6%) and 211 without, were included. SA occurred partially (n = 64; 59.8%) and completely (n = 43; 40.2%). The technical and clinical outcomes and survival were similar in the groups with and without SA. Food impaction and resultant repeat intervention rates were higher in the SA group than in the non-SA group (<I>P</I> < .001 and <I>P</I> < .001, respectively), and were associated with complete SA (<I>P</I> = .007). Stent patency rate was lower in the SA group than in the non-SA group (<I>P</I> = .003).</P> <P><B>Conclusions</B></P> <P>SA was associated with increased food impaction, resulting in a greater incidence of stent malfunction and shorter stent patency compared with a lack of SA. The concept of SA may be useful for the improvement of stent patency and avoidance of food impaction.</P>
Rhizosphere microbiome structure alters to enable wilt resistance in tomato
Kwak, Min-Jung,Kong, Hyun Gi,Choi, Kihyuck,Kwon, Soon-Kyeong,Song, Ju Yeon,Lee, Jidam,Lee, Pyeong An,Choi, Soo Yeon,Seo, Minseok,Lee, Hyoung Ju,Jung, Eun Joo,Park, Hyein,Roy, Nazish,Kim, Heebal,Lee, M Nature Pub. Co 2018 Nature biotechnology Vol.36 No.11
<P> Tomato variety Hawaii 7996 is resistant to the soil-borne pathogen Ralstonia solanacearum, whereas the Moneymaker variety is susceptible to the pathogen. To evaluate whether plant-associated microorganisms have a role in disease resistance, we analyzed the rhizosphere microbiomes of both varieties in a mesocosm experiment. Microbiome structures differed between the two cultivars. Transplantation of rhizosphere microbiota from resistant plants suppressed disease symptoms in susceptible plants. Comparative analyses of rhizosphere metagenomes from resistant and susceptible plants enabled the identification and assembly of a flavobacterial genome that was far more abundant in the resistant plant rhizosphere microbiome than in that of the susceptible plant. We cultivated this flavobacterium, named TRM1, and found that it could suppress R. solanacearum-disease development in a susceptible plant in pot experiments. Our findings reveal a role for native microbiota in protecting plants from microbial pathogens, and our approach charts a path toward the development of probiotics to ameliorate plant diseases. </P>
Hwang Jisun,Kim Pyeong Hwa,윤희망,Sang Hoon Song,Ah Young Jung,Jin Seong Lee,Cho Young Ah 대한초음파의학회 2023 ULTRASONOGRAPHY Vol.42 No.1
Purpose: The aim of this study was to validate the postnatal urinary tract dilation (UTD) classification system by correlating it with the need for surgical intervention. Methods: Young infants who underwent ultrasound (US) examinations for prenatal hydronephrosis were retrospectively identified. The kidney units (KUs; right, left, or bilateral) were graded from UTD P0 (very low risk) to P3 (high risk) based on seven US criteria from the UTD system. Surgery-free survival curves were constructed using the Kaplan-Meier method. Univariable and multivariable Cox proportional-hazards regression analysis clustered by patients was performed. Interobserver agreement was analyzed using the weighted kappa coefficient. Results: In total, 504 KUs from 336 patients (mean age, 18.3±15.9 days; range, 1 to 94 days; males, n=276) were included, with a median follow-up of 24.2 months. Fifty-eight KUs underwent surgical intervention. Significant differences were observed among the Kaplan-Meier curves stratified into UTD groups (P<0.001). The presence of anterior-posterior renal pelvic diameter ≥15 mm (hazard ratio [HR], 8.602; 95% confidence interval [CI], 1.558 to 43.065), peripheral calyceal dilation (HR, 8.190; 95% CI, 1.558 to 43.065), ureteral dilation (HR, 2.619; 95% CI, 1.274 to 5.380), parenchymal thickness abnormality (HR, 3.371; 95% CI, 1.574 to 7.223), bladder abnormality (HR, 12.209; 95% CI, 3.616 to 41.225) were significantly associated with the occurrence of surgery. The interobserver agreement was moderate to almost perfect agreement for US features (κ=0.564-0.898) and substantial for final UTD grades (κ=0.716). Conclusion: The UTD classification system is reliable and appropriately stratifies the risk of surgical intervention.
김사중 ( Kim Sa Jung ),이찬기 ( Lee Chan Gi ),송평섭 ( Song Pyeong Seob ),윤종성 ( Yun Jong Seong ),강용 ( Kang Yong ),김준식 ( Kim Jun Sig ),최명재 ( Choe Myeong Jae ) 한국공업화학회 2003 공업화학 Vol.14 No.5
폐폴리스티렌 및 범용 폴리스티렌을 각각 시료로 하여 TGA (thermogravimetric analysis)를 이용하여 열분해와 연소 반응을 수행하여 폐폴리스티렌과 범용 폴리스티렌의 열분해 및 연소반응 특성을 검토하였다. TGA의 승온속도는 10 K/min, 20 K/min, 30 K/min, 40 K/min 및 50 K/min로 변화 시켰으며, 질소와 산소 분위기에서 가열온도는 323 K~1073 K 범위에서 수행하였다. 반응 특성 검토에서 중요한 요소인 반응차수 및 활성화 에너지들은 Kissinger, Freeman-Carroll, Chatterjee-Conrad, Friedman 및 Coats-Redfern 방법을 사용하여 해석하였고, 각각의 방법에 따른 열분해와 연소반응의 활성화에너지 값을 구하여 비교, 해석하였다. 연구에 사용된 해석 방법과 실험조건에 따라 결과값에 차이가 있음을 알 수 있었으며, 연소 분위기의 겉보기 활성화에너지 값은 140~225 kJ/mol으로 열분해 분위기의 155~260 kJ/mol 값보다 작게 나타났다. Thermal characteristics and kinetic parameters of polystyrene waste and polystyrene were determined by means of thermogravimetry (TGA) at non-isothermal heating conditions(10 K/min, 20 Wmi, 30 K/min, 40 Wmin and 50 K/min) both for pyrolysis and combustion processes. Activation energies and reaction orders of the samples were determined by different methods such as Kissinger, Freeman-Carroll, Chattejee-Conrad, Friedman and Coats-Redfem methods. These methods were compared in terms of their accuracy and the ease of interpretation of the kinetics of thermal decomposition. It was found that the apparent activation energies of the thermal processes were different with variation of analytical methods and experimental conditions. The apparent activation energy of combustion at the atmosphere of 80∼130 KJ/mol was lower than that of pyrolysis at the atmosphere of 90∼150 KJ/mol.
Investigation of CDMA Air Interface and Protocols
Kim, Sun-Young,Song, Pyeong-Jung,Kim, Jin-Up,Lee, Hyuck-Jae Electronics and Telecommunications Research Instit 1997 ETRI Journal Vol.19 No.3
This appendix deals with the Korean air interface standard, TTA-62, for CDMA Mobile Systems, (CMS) [1]-[2]. The standard has been set up by Telecommunications Technology Association (TTA) which is a standardization organization in Korea [3]. This standard is an important specification that should be determined prior to the development of a digital cellular system. The CMS has been developed on the basis of this standard and the papers published in this special issue are the results of the CMS development. This appendix also describes the technical commonality of these papers. It covers the outline of the air interface and protocol specifications. The outline includes its major characteristics, radio protocol architecture, functionalties, and call processing. A comparison is also given between TTA-62 and IS-95[4], a North American digital cellular standard.