임신 제 일삼분기와 제 이삼분기 초음파의 태아기형 진단의 유용성에 대한 고찰

최승도,최규연,이정재,정성윤,이임순,이권해 순천향의학연구소 2003 Journal of Soonchunhyang Medical Science Vol.9 No.2

Objective: Ultrasonographic screening between 9 and 13 weeks for fetal structural abnormalities using transvaginal sonography in unselected population. Visualization of detailed fetal anatomy in the first trimester has improved as a result of technological progress in ultrasound machines and the introduction of transvaginal sonography(TVS). Our study aims to evaluate the accuracy of TVS as a screening tool for detecting fetal malformations in a nonselected population of pregnant women. For this purpose we compared the results obtained by using second trimesster TA scanning with those obtained using TVS at 9-14 weeks' gestation. Methods: From March 2001 to February 2003, 620 unselected consecutive pregnant women were recruited at their initial visit at Soonchunhyang university hospital, department of obstetrics and gynecology and offered a TVS scan at the average gestational age of 9-13 weeks in addition to the TA screening usually performed between 22-26 weeks. To fulfill the technical requirements of a screening test, ultrasonographic examinations were performed by skillful operators with different degrees of experienced using adequate instruments Aloka SSD 5500 (Aloka Co. Ltd., Tokyo, Japan) provided with either a 3.5-5MHz TA probe or a 5-7.5MHZ TV probe) in a fixed scanning time of maximum 30 min, generally considered sufficient for a complete fetal anatomic survey. Results: During the study period we found in our unselected population an overall prevalence of target abnormalities of 2.2%(24 malformed fetuses out of 600 screened). In the fetuses examined by TVS, 16 abnormalities were detected whereas 8 were not; of these, 6 were detected at transabdominal rescreening at 22-26 weeks and the remaining 2 were observed after birth. A nuchal region abnormality was the most frequent type of malformation detected in the early scan, including six cases of nuchal edema, two cases of cystic hygroma associated with hygroma associated with hydrops, three cases of hydronephrosis, one case of fetal neck teratoma, one case of cleft lip. Conclusion: This study has demonstrated the potential of screening a low risk population for fetal abnormalities at 9-13 weeks of gestation using transvaginal sonography and rescreened via transabdominal sonography at 22-26 weeks. Larger studies are required to establish the clinical value of the first trimester scan.

심근경색 환자에서의 헤파린 사용시 장요근 혈종과 연관된 후복막강내 자발적 출혈 1예

김효정,김도연,황민규,조홍근 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.10

MDVP와 Praat, Dr. Speech간의 음향학적 측정치에 관한 상관연구

유재연,정옥란,장태염,고도홍 한국음성과학회 2003 음성과학 Vol.10 No.3

The purpose of this study was to conduct a correlational analysis among Fo, Jitter, Shimmer, and NHR(HNR), and NNE estimated by three speech analysis softwares, MDVP, Praat and Dr, Speech. Thirty females and 15 males with normal voice participated in the study. We used Sound Forge 6.0 to record their voice. MDVP, Praat and Dr. Speech were used to measure the acoustic parameters. The Pearson correlation coefficient was determined through a statistical analysis. The results came out as follows: Firstly, there was a strong correlation between Fo and Shimmer of both instruments. However, there was no correlation between Jitter of both instruments. Secondly, Shimmer showed a stronger correlation with HNR, NHR, and NNE than Jitter. Therefore, Shimmer was considered to be more useful and sensitive parameter to identify dysphonic voice compared to Jitter.

工場自動化에서 産業用 로보트의 導入戰略과 技術方向

車政演,崔度元 군산대학교 지역개발연구소 1993 地域開發硏究 Vol.5 No.-

電氣集塵機 效率向上을 위한 放電極 印加電壓 特性에 關한 硏究

李廷株,金鍾浩,都硏知 龍仁大學校 1996 용인대학교 논문집 Vol.12 No.-

The purpose of this study was to determine the optimum collection efficiency for various applied voltage of Electrostatic Precipitator. The experiment was performed between 15kV and 30kV. Collection efficiency was measured by Anderson Sampler(cascade impactor). The results of this experiment were as follows ; (1) In order to determine the ESP's optimum operating condition, we measured an electric property of discharging electrode. (2) Optimum applied voltage and overall collection efficiency were 25kV and 98.4%, respectively. (3) When applied voltage value was higher than 25kV, the collection efficiency shows a tendency to decline. We estimated that this result was due to ionic winds generated by electric field.

Comparison of Polyphenylene Sulfide Composites Having Different Processing Temperatures and Glass Fibers

( Do Yeon Jeong ),( Seung Yong Yoo ),( Chan-gyu Jung ),( Jaeyong Lee ),( Sang Hoon Kim ),( Pyeong-chan Lee ),( Hyun Wook Lee ),( Jin Uk Ha ) 한국고무학회 2019 엘라스토머 및 콤포지트 Vol.54 No.4

Polyphenylene sulfide (PPS) is a well-known super engineering plastic with a high melting temperature (above 290°C). It is generally insoluble under regular conditions. Therefore, it can be used for replacing metallic materials. Many researchers are looking at the possibility of replacing aluminum in the engine compartment of an automobile. However, studies on PPS are not common as compared to conventional engineering plastics because only a few companies produce super engineering plastics. In this research, the material properties of PPS composites containing two different kinds of glass fibers and produced under different processing temperatures were investigated. The tensile strength of the PPS composites increased as the processing temperature increased. Although glass fibers with similar aspect ratios were compounded under the same processing condition, one of them yielded a higher mechanical strength.

[P044] A case of pretibial thyroid dermopathy

( Jeong Won Jo ),( Young Bin Shin ),( Hae Bong Jeong ),( Yun Sun Moon ),( Do Seon Jeong ),( Eui Chang Jung ),( Chi Yeon Kim ),( Tae Jin Yoon ) 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.1

Pretibial myxedema(PM) is a dermatological manifestation of Graves` disease, which commonly presents as diffuse, non-pitting edema of shins and less often as plaques, nodules, or elephantiasis lesions mimicking lymphedema. Most common site is pretibial area and localized thickening of the pretibial skin causes deposition of acid mucopolysaccharides. There are 7 cases of pretibial myxedema reported in domestic dermatology literature. The only four of cases occurred after treatment of hyperthyroidism like that our case. Herein, we report a case of pretibial myxedema with Grave`s disease and Grave`s ophthalmopathy. A 51-year-old male visited our department with multiple erythematous patches and nodules on Lt. pretibial area. He had been diagnosed with Grave`s disease 6 months ago and Grave`s ophthalmopathy 3 months ago. The incisional biopsy on Lt. pretibial area showed mucinosis in dermis with perivascular lymphocytic infiltration. The lesions improved after steroid intralesional injection. For persisted local lesions despite improvement of systemic symptoms, we propose that the steroid intralesional injection may be an alternative to treatment.

Selective methane production from visible-light-driven photocatalytic carbon dioxide reduction using the surface plasmon resonance effect of superfine silver nanoparticles anchored on lithium titanium dioxide nanocubes (Ag@Li_xTiO₂)

Do, Jeong Yeon,Chava, Rama Krishna,Mandari, Kotesh Kumar,Park, No-Kuk,Ryu, Ho-Jung,Seo, Myung Won,Lee, Doyeon,Senthil, T.S.,Kang, Misook Elsevier 2018 Applied Catalysis B Vol.237 No.-

<P><B>Abstract</B></P> <P>This study focused on the results of applying the strong surface plasmon resonance (SPR) effect of silver (Ag) particles anchored on cubic phase Li<SUB>x</SUB>TiO<SUB>2</SUB> to the carbon dioxide (CO<SUB>2</SUB>) photoreduction reaction. The study demonstrated the importance of three aspects: First, the cubic TiO<SUB>2</SUB>, which activated the [101] facet, was successfully produced. Secondly, Li<SUP>+</SUP> ions were introduced as Frenkel defects in some lattices to create oxygen defects. These vacancies increased the adsorption of carbon dioxide and sped up the rate-determining step in the CO<SUB>2</SUB> reduction reaction. In other words, they induced the easy conversion of CO<SUB>2</SUB> to CO, which is the first reduction product. Finally, the loading of Ag nanoparticles onto the Li<SUB>x</SUB>TiO<SUB>2</SUB> cubic surface the improved photocatalytic activity through SPR effects, and in particular led to selective conversion of CO<SUB>2</SUB> to methane (CH<SUB>4</SUB>). Quantitatively, the yield of CH<SUB>4</SUB> from CO<SUB>2</SUB> using the Ag@Li<SUB>0.075</SUB>TiO<SUB>2</SUB> particles was 49 μmol/g after 10 h of reaction, which was 8.2 and 1.5 times higher than that of cubic TiO<SUB>2</SUB> (6 μmol/g) and Li<SUB>0.075</SUB>TiO<SUB>2</SUB> (33 μmol/g) under UV-light. Additionally, its activity did not decrease under visible lights of 420 and 620 nm with the similar CH<SUB>4</SUB> yields of 42 and 34 μmol/g after 10 h, respectively. In particular, the production ratio of CH<SUB>4</SUB> and CO using cubic TiO<SUB>2</SUB> and Li<SUB>x</SUB>TiO<SUB>2</SUB> were about 1:1, with no selectivity for either product. However, after metallic Ag nanoparticles were loaded, the product selectivity shifted towards CH<SUB>4</SUB>, and the product ratio of CH<SUB>4</SUB> to CO was about 3:1. Furthermore, the Ag@Li<SUB>0.075</SUB>TiO<SUB>2</SUB> particles exhibited a strong SPR effect (in particular, direct electron transfer), which contributed to maintaining the charge separation and the lifetime of the catalyst over a long period. Catalytic deactivation was not observed during five cycles of recycling tests.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Cubic TiO<SUB>2</SUB> activated the [101] facet was successfully synthesized. </LI> <LI> Li<SUP>+</SUP> addition made oxygen defects in some lattices. </LI> <LI> Ag particles anchored on cubic phased Li<SUB>x</SUB>TiO<SUB>2</SUB>. </LI> <LI> Ag@Li<SUB>x</SUB>TiO<SUB>2</SUB> improved photocatalytic activity, and produced selectively methane. </LI> <LI> Ag@Li<SUB>0.075</SUB>TiO<SUB>2</SUB> exhibited a strong SPR effect in particular direct electron transfer. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Selective methane production from visible-light-driven photocatalytic carbon dioxide reduction using the surface plasmon resonance effect of superfine silver nanoparticles anchored on lithium titanium dioxide nanocubes (Ag@Li<SUB>x</SUB>TiO<SUB>2</SUB>).</P> <P>[DISPLAY OMISSION]</P>

P098 A clinical study on herpes zoster during the last 5-year-period (2011-2015)

( Jeong Won Jo ),( Hae Bong Jeong ),( Yun Sun Moon ),( Do Seon Jeong ),( Eui Chang Jung ),( Chi Yeon Kim ),( Tae Jin Yoon ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.2

<div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div> Background: Herpes zoster is a common dermatologic disease. But there has not been any report on the clinical characteristics of herpes zoster in the Province of Gyeongsangnam-do. Objectives: The purpose of this study was the elucidation of the clinical characteristics of herpes zoster in the Province of Gyeongsangnam-do. Methods: The study was conducted between 2011 and 2015 at our hospital outpatients. 901 patients with herpes zoster were evaluated in regard to age, sex, dermatomic distributions, associated diseases and complications. Results: Out of 901 cases, 396 were males and 505 were females. The maximum incidence was in the over 70 year-old group (26.4%). The most frequent involved dermatome was the trigeminal dermatome (28.7%). Associated diseases were observed in 679 patients (75.3%), which included hypertension (21.2%), malignancy (11.4%) and so on. Out of 901 patients, 443 (49.2%) developed complications. The most common complication was postherpetic neuralgia (27.1%). It is noteworthy that skin edema was accompanied from 43 patients (4.8%). Fourty patients showed edematous change on herpes zoster lesion. But other 3 patients showed facial edema in spite of involving herpes zoster in other area. Conclusion: Most of the results are similar to those previously reported, except for a higher incidence in trigeminal dermatome. The most interesting part of this study is herpes zoster can cause skin edema. We need to take further studies in future by others to explain causes in detail.

Effect of acidity on the performance of a Ni-based catalyst for hydrogen production through propane steam reforming: K-AlSi_<i>x</i>O_<i>y</i> support with different Si/Al ratios

Do, Jeong Yeon,Kwak, Byeong Sub,Park, No-Kuk,Lee, Tae Jin,Lee, Sang Tae,Jo, Seung Won,Cha, Moon Soon,Jeon, Min-Kyu,Kang, Misook Pergamon Press 2017 International journal of hydrogen energy Vol.42 No.36

<P><B>Abstract</B></P> <P>Propane steam reforming (PSR) for the production of H<SUB>2</SUB> was catalyzed by a NiO/K-AlSi<SUB> <I>x</I> </SUB>O<SUB> <I>y</I> </SUB> catalyst synthesized with various Si/Al ratios (Si/Al = 0, 0.3, 0.5, 0.7, and 1.0). The effect of the Si/Al ratio on the acidity of the NiO/K-AlSi<SUB> <I>x</I> </SUB>O<SUB> <I>y</I> </SUB> catalyst for PSR was investigated. NiO/K-AlSi<SUB> <I>x</I> </SUB>O<SUB> <I>y</I> </SUB> gave a higher H<SUB>2</SUB> selectivity and stability during PSR than NiO/K-SiO<SUB>2</SUB> and NiO/K-Al<SUB>2</SUB>O<SUB>3</SUB>. The NH<SUB>3</SUB>-TPD results showed that the acid quantity and strength of NiO/K-AlSi<SUB> <I>x</I> </SUB>O<SUB> <I>y</I> </SUB> changed significantly depending on the Si/Al ratio. With an increased Si/Al ratio, the densities of both weak and strong acid sites increased. The C<SUB>3</SUB>H<SUB>8</SUB>- and CO-TPD results indicated that desorption amounts increased significantly in all NiO/K-AlSi<SUB> <I>x</I> </SUB>O<SUB> <I>y</I> </SUB> catalysts relative to those of NiO/K-SiO<SUB>2</SUB> and NiO/K-Al<SUB>2</SUB>O<SUB>3</SUB>, and the adsorption amount increased with the Si/Al ratio. PSR results showed that the NiO/K-AlSi<SUB> <I>x</I> </SUB>O<SUB> <I>y</I> </SUB> catalyst exhibited much better stability than the NiO/K-SiO<SUB>2</SUB> and NiO/K-Al<SUB>2</SUB>O<SUB>3</SUB> catalysts. This study confirms the following facts: when the acidity is appropriately adjusted for the catalyst, adsorption of the reaction gas increases, which eventually increases the reaction rate and also inhibits strong sintering between the nickel and the Al<SUB>2</SUB>O<SUB>3</SUB> support. As a result, deterioration of the catalyst can be reduced.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The NiO/K-AlSi<SUB> <I>x</I> </SUB>O<SUB> <I>y</I> </SUB> catalyst was synthesized for the production of H<SUB>2</SUB> from PRS. </LI> <LI> The acid quantity and strength of NiO/K-AlSi<SUB> <I>x</I> </SUB>O<SUB> <I>y</I> </SUB> changed significantly depending on the Si/Al ratio. </LI> <LI> The adsorptions of C<SUB>3</SUB>H<SUB>8</SUB> and CO increased with the Si/Al ratio. </LI> <LI> The NiO/K-AlSi<SUB> <I>x</I> </SUB>O<SUB> <I>y</I> </SUB> catalyst exhibited much better stability during PSR. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>