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세포질내 정자주입법(ICSI)에 있어서 정자흡입 및 난자내 주입방법에 관한 연구
이택후,김항진,송건호,김대근,전상식,박윤규,서태광,전병균,류은경,이은숙,문진수,김광철 경북대학교 의학연구소 2000 경북대학교병원의학연구소논문집 Vol.4 No.1
Study on Method of Sperm Aspiration and Injection into an Oocyte in Intracytoplasmic Sperm Injection(ICSI) Immobilization of spermatozoa prior to intracytoplasmic sperm iniection(ICSI) sometimes results in crooked tail and this makes it difficult to aspirate sperm into an injection pipette tail first. Head-first sperm aspiration into an injection pipette avoid this problem due to the bigger size of the sperm head. The effect of head or tail-first sperm injection into an oocyte on fertilization cleavage, percentage of grade I embryos and development to blastocyst stage in ICSI program has been studied. A single living immobilized spermatozoa from oligoasthenozoospermic patient was injected into an oocyte head-first or tail-first according to the treatment. Eighteen hours after microinjection, oocytes ware inspected for survival and fertilization Fertilized oocytes with two pronuclei were cultured in 30μl drop of mHTF supplemented with 10% heat-inactivated follicular fluid(FF) at 37℃. On day 2. embryo transfer was performed with cleaved embryos. The remaining 2-8 cell stage embryos were co-cultured with BRL cells in mHTF + 10% FF for 72 hours and the developmental stage was observed. The data were analyzed by Analysis of Variance. A total of 164 oocytes from 36 cycles were assigned to earth treatment and ICSI was performed(88 head-first, tail-first). The rates of normal fertilization were 81.8% and 76.3% for head-first and tail-first, respectively. Of the fertilized oocytes, the percentage of cleaved embryos and the percentage of grade 1 embryo among cleaved embryos were 88.9% and 68.8%, 93.1% and 74.1% for head-first and tail-first, respectively. Of the 2-8 cell embryos cultured, 44.4%(16/36) and 50.0%(10/20) for head first and tail first, respectively developed to blastocyst stage. There were no differences in fertilization, cleavage, rates of grade 1 embryos, and development to blastocyst stage. In conclusion, head-first or tail-first sperm injection into an oocyte in ICSI program does not affect fertilization and subsequent embryo development to blastocyst stage in vitro.
서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)
김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1
In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(PPNG), we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 64.5% in 1998.
Novel Techniques for Real Time Computing Critical Clearing Time SIME-B and CCS-B
Hung Nguyen Dinh,Minh Y Nguyen,Yong Tae Yoon 대한전기학회 2013 Journal of Electrical Engineering & Technology Vol.8 No.2
Real time transient stability assessment mainly depends on real-time prediction. Unfortunately, conventional techniques based on offline analysis are too slow and unreliable in complex power systems. Hence, fast and reliable stability prediction methods and simple stability criterions must be developed for real time purposes. In this paper, two new methods for real time determining critical clearing time based on clustering identification are proposed. This article is covering three main sections: (i) clustering generators and recognizing critical group; (ii) replacing the multi-machine system by a two-machine dynamic equivalent and eventually, to a one-machineinfinite-bus system; (iii) presenting a new method to predict post-fault trajectory and two simple algorithms for calculating critical clearing time, respectively established upon two different transient stability criterions. The performance is expected to figure out critical clearing time within 100ms-150ms and with an acceptable accuracy.
윤경한,정태석,신항계,방동식,이광훈 대한의진균학회 1997 대한의진균학회지 Vol.2 No.2
Background: It is important to understand the morphologic characteristics for the identification of a microorganism. Electron microscopy has contributed a great deal to the field of mycology. Scanning electron microscope(SEM) has become a useful tool to study three-dimensional images of fungi. Vacuum dessicator aqueous fixation is useful sample preparation technique for SEM examination of fungal specimens without surface distortions. Objective : This study was done to observe the three-dimensional structures of dermatophytes preserving their natural growth characteristics. Methods : Trichophyton rubrum, T. mentagrophytes, Microsporum canis, M. gypseum, and Epidermophyton floccosum were isolated and cultured on Sabouraud agar, corn meal agar, or rice agar plate. Vacuum dessicator aqueous fixation was utilized as a preparation technique for SEM examinations of the fungi. Results : Vacuum dessicator aqueous fixation led us to examine the aerial mycelia including conidia of the dermatophytes under SEM. The five species of dermatophytes showed their own characteristic structures especially on microconidia and macroconidia. Conclusion : The use of ultrastructural research has made it possible to identify the species of fungi and can be expaned and improved along with the development of SEM and specimen preparation techniques.
Hung, Nguyen Thanh,Park, Sung-Hoon,Bae, Joonwon,Yoon, Young Soo,Kim, Ji Hyeon,Son, Hyung Bin,Lee, Daeho,Kim, Il Tae,Hur, Jaehyun Pergamon Press 2016 Electrochimica Acta Vol. No.
<P><B>Abstract</B></P> <P>We present a facile approach to making Al-Sb, carbon-modified (Al-Sb-C) nanocomposites for use as new anode materials in lithium-ion batteries (LIB). Alloying is achieved by one step synthesis using high energy mechanical milling (HEMM), producing nanometer-sized alloy particles of Sb-Al<I> <SUB>x</SUB> </I>C<I> <SUB>y</SUB> </I>-C. Based on electrochemical analyses, we determined that Sb acts as an active material, and both Al and carbon create a hybrid buffering matrix that mitigates the volume expansion of the active material during lithiation/delithiation to a greater degree than that by a pure metallic matrix (AlSb). In addition, we optimized the stoichiometric ratio of Al and Sb with regard to specific capacity and cycling performance. Of the ratios tested, a 1:1 molar ratio of Al and Sb exhibited the best cycling performance (302.5mAhg<SUP>−1</SUP> after 200 charge/discharge cycles). Although our Al-Sb-C composite had low initial coulombic efficiency (∼59%), recovery to∼97% occurred within three cycles, indicating that initial side reactions are quickly reduced over the course of cycling. AlSb-C anodes also showed good rate capability and volumetric capacity. Overall, the new AlSb-C composite is a promising candidate for use as negative electrodes in lithium-ion batteries, providing an alternative to commercially available graphite electrodes.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We fabricated Sb-Al<SUB>x</SUB>C<SUB>y</SUB>-C nanocomposite alloy anodes by high-energy mechanical milling for use in lithium-ion batteries. </LI> <LI> The electrochemical performances, morphologies, and crystallographic features of AlSb and AlSbC with three different mixing ratios of Al and Sb were investigated. </LI> <LI> We found that AlSb(1:1)-C showed the best electrochemical performances in terms of specific capacity, cyclic performances, and rate capabilities. </LI> <LI> The mechanism of formation of AlSbC was examined by using XRD, TEM, and DCP data. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>We fabricated the high performances of Sb-Al<SUB>x</SUB>C<SUB>y</SUB>-C nanocomposite alloy anodes using high-energy mechanical milling for use in lithium-ion batteries.</P> <P>[DISPLAY OMISSION]</P>
대량 출혈을 동반한 공장의 Dieulafoy 병변 1 예
이항락(Hang Lak Lee),윤병철(Byung Chul Yoon),변태준(Tae Jun Byun),한호(Ho Han),전운현(Woon Hyun Jun),박준용(Joon Yong Park),이숭환(Soong Hwan Lee),은창수(Chang Soo Eun),이오영(Oh Young Lee),전용철(Yong Chul Jun),한동수(Dong Soo Han) 대한소화기학회 2002 대한소화기학회지 Vol.39 No.2
Dieulafoy's lesion is an uncommon cause of gastrointestinal bleeding. However, it is clinically important in that it can be associated with recurrent and massive gastrointestinal bleeding. The bleeding results from an abnormal large submucosal artery. On endoscopy, a small mucosal defect with a protruding vessel or fresh clot may be visualized if the patient is actively bleeding. In most cases, the lesion is encountered in the proximal stomach within 6 cm of the gastroesophageal junction, but similar lesions have been described in the antrum, duodenum, colon, and rectum. In particular, jejunal Dieulafoy's lesion is extremely rare. We experienced one case of recurrent and massive bleeding from a proximal jejunal Dieulafoy's lesion, which was confirmed by the pathologic examination of the resected specimen. (Korean J Gastroenterol 2002;39:123-127)