체외수정시술로 출생한 쌍생아의 임상적 경과에 대한 비교 분석

김경아,민우경,임재우,전누리,원혜성,김정훈,김애란,이필량,이인식,김기수,김암,피수영,Kim, Kyung-Ah,Min, Uoo-Gyung,Lim, Jae-Woo,Jun, Nu-Lee,Won, Hye-Sung,Kim, Chung-Hoon,Kim, Ellen Ai-Rhan,Lee, Pil-Ryang,Lee, In-Sik,Kim, Ki-Soo,Kim, Ahm,Pi 대한소아청소년과학회 2003 Clinical and Experimental Pediatrics (CEP) Vol.46 No.3

Purpose : To examine various neonatal outcomes and perinatal factors resulting from assisted reproduction compared to that of spontaneous conception. Methods : This is a retrospective study. The control cases were all twins of spontaneous conception born between periods from January 1995 to June 2000. The study cases were identified from twins conceived by assisted reproduction in the same time peried. A total of 460 sets of twins consisted of 250 twins of spontaneous conception and 156 twins of assisted reproduction were studied. The primary outcomes were neonatal morbidity and mortality and the secondary outcomes were perinatal factors including number, length and cost of hospitalization for the delivery. Results : No differences were seen in various neonatal factors including gestational age, birth weight and incidences of respiratory distress syndrome, patent ductus arteriosus, necrotizing enterocolitis, hyperbilirubinemia, sepsis, intraventricular hemorrhage and the length of hospitalizations. Lower one minute and five minute Apgar scores and frequently encountered electrolyte abnormalities were observed in neonates of assisted reproduction. In general, the second twin of assisted reproduction had increased incidences of respiratory distress syndrome, sepsis and necrotizing enterocolitis than the first twin. Increased frequencies of preterm labor, hospitalization and elective cesarean section were seen among mothers who underwent artifical conception. However, overall hospital costs in terms of mothers hospitalization for the delivery and neonates hospitalization did not show differences. Conclusion : Assisted reproduction twins had similar neonatal morbidities, mortalities and perinatal morbidities compared to those born by spontaneous conception.

와류 현상을 이용하는 호흡기류센서

김경아,이인광,박준오,이수옥,신은영,김윤기,김경천,차은종,Kim, Kyung-Ah,Lee, In-Kwang,Park, Jun-Oh,Lee, Su-Ok,Shin, Eun-Young,Kim, Yoon-Kee,Kim, Kyung-Chun,Cha, Eun-Jong 대한의용생체공학회 2009 의공학회지 Vol.30 No.5

The present study developed a new technique with no physical object on the flow stream but enabling the air flow measurement and easily incorporated with the devices for cardiopulmonary resuscitation(CPR) procedure. A turbulence chamber was formed in the middle of the respiratory tube by locally enlarging the cross-sectional area where the flow related turbulence was generated inducing energy loss which was in turn converted into pressure difference. The turbulence chamber was simply an empty enlarged air space, thus no physical object existed on the flow stream, but still the flow rate could be evaluated. Computer simulation demonstrated stable turbulence formation big enough to measure. Experiment was followed on the proto-type transducer, the results of which were within ${\pm}5%$ error compared to the simulation data. Both inspiratory and expiratory flows were obtained with symmetric measurement characteristics. Quadratic curve fitting provided excellent calibration formula with a correlation coefficient>0.999(P<0.0001) and the mean relative error<1%. The present results can be usefully applied to accurately monitor the air flow rate during CPR.

Corynebacterium glutamicum ATCC 13058 의 Histidine 생합성 유전자 hisC 의 클로닝과 염기서열 분석

김경아,김현수,이승현,유관희,박갑주,이명석,이형환,김수영 ( Kyung Ah Kim,Hyun Soo Kim,Seung Hyun Lee,Kwan Hee You,Kap Joo Park,Myeong Sok Lee,Hyung Hoan Lee,Soo Young Kim ) 한국유전학회 1997 Genes & Genomics Vol.19 No.4

The chromosomal DNA fragments of Corynebacterium glutamicum ATCC 13058 containing genes involved in histidine biosynthesis were cloned in pBluescript SK(+). To investigate the structural organization and the regulation of these genes, recombinant clones complementing E. coli hisA, hisB, hisC, hisI and hisF mutants were isolated from genomic library. A recombinant plasmid containing a 5.6kb fragment of genomic DNA was able to complement E. coli hiA, hisB and hisF. But pCGH 13, carrying insert of 1.7kb complemented only E. coli hisC. The genetic data indicate that these genes are clustered in a small region f the chromosome. Nucleotide sequence analysis of the 1.7kb fragment of genomic DNA revealed one putative open reading frame which showed significant homology with the hisC gene of E. coli K-12 and Lacctococcus lactis.

직업적 음성사용자에서 날달걀 먹기 전과 후의 음성 변화

김경아,권순복,김성원,이형신,홍종철,김영록,이봉주,한영진,유태현,이강대,Kim, Kyung-A,Kwon, Soon-Bok,Kim, Sung-Won,Lee, Hyung-Shin,Hong, Jong-Cheol,Kim, Yong-Rok,Lee, Bong-Joo,Han, Yung-Jin,Yu, Tae-Hyun,Lee, Kang-Dae 한국음성학회 2007 음성과학 Vol.14 No.2

The purpose of this study was to observe the effect of eating a raw egg by professional or nonprofessional voice users on their voice quality and the duration of the effect. 20 professional voice users and 20 nonprofessional voice users participated in the experiment and they had gone through stroboscopy to have no vocal or laryngeal diseases. The voice exam was performed three times: before eating a raw egg (1st period), right after eating it (2nd period), and 10 minutes later (3rd period). By using Multi-dimensional Voice Program which is a software of Computerized Speech Lab 4500 as a voice analysis instrument, the authors checked the F0, Jitter, Shimmer, Noise to harmonic ratio (NHR), and Voice Range Profile (VRP). Results showed as follows: Firstly, vocal hygiene was good in 57.5% of the total subjects and was poor in 42.5%. 40% of professional voice users and 75% of nonprofessional voice users hand good quality. 77.5% of the total subjects had the vocal fatigue while 22.5% of the subjects did not. 95% of the professional voice users and 60% of nonprofessional voice users complained the vocal fatigue. 60% of the total subjects reported a subjective vocal symptom. 65.0% professional voice users and 70.0% of nonprofessional voice users reported a voice symptom. From the results above, we suggest that eating a raw egg may lead to imporve voice quality of the professional voice users.

수열 합성 공정 조건이 티탄산 납의 상 형성에 미치는 영향

김경아,김정석,천채일,Kim, Kyoung-A,Kim, Jeong-Seog,Cheon, Chae-Il 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.1

Lead titanate ($PbTiO_3$) powder was prepared from lead nitrate ($Pb(NO_3)_2$) and titania ($TiO_2$) by hydrothermal route. Phase formation process was investigated by observing the phases formed in various experimental conditions like different KOH concentration, reaction temperature and time. $PbTiO_3$ powder was fabricated when the KOH concentration was 0.8M or higher. An intermediate compound, $PbTi_{0.8}O_{2.6}$, was formed at first by a reaction between PbO and $TiO_2$ and changed into $PbTiO_3$ powder with a perovskite crystal structure. A $PbTiO_3$ phase was formed in a shorter time when a KOH concentration was increased from 0.8M to 8M because a driving force for a $PbTiO_3$ formation was increased due to an increase in a degree of supersaturation. And $TiO_2$ (rutile) and $3PbO{\cdot}H_2O$ were observed at room temperature in a 0.8M KOH solution and $TiO_2$(rutile) and PbO (litharge) in a 8M KOH. A $PbTiO_3$phase was also formed in a shorter time at a higher reaction temperature as a reaction temperature influenced the rates for a dissolution and a precipitation.

2011 학술세미나 주요 발표 - 소셜미디어를 활용한 정보서비스 전략 -포스텍 청암학술정보관을 중심으로-

김경아,Kim, Gyeong-A 한국전문도서관협의회 2011 KSLA bulletin Vol.3 No.-

Cellular IP 핸드오프 성능개선

김경아,김종권,박재윤,Kim, Gyeong-A,Kim, Jong-Gwon,Park, Jae-Yun 한국정보처리학회 2002 정보처리학회논문지 C : 정보통신,정보보안 Vol.9 No.1

핸드오프는 무선 데이터 네트웍에서 TCP 성능을 저하시키는 가장 중요한 요인중 하나이다. 본 논문에서 패킷의 유신과, 중복이 없는 핸드오프 방법인 LPM(Last Packet Marking)을 제시한다. LPM은 Cellular IP 세미소프트 핸드오프를 개선한 방법으로 이동호스트에게 안전한 핸드오프 시점 알려준다. 새고 소개한 제어 패킷은 SPM(Semisoft reply Message) 하나이다. 컴퓨터 시뮬레이션을 통한 실험에서 LPM 방법은 패킷의 중복이나 유신이 없어서 TCP의 성능을 상당히 향상시켰다. Handoff is one of the most important factors that ma? degrade the performance of TCP connections in wireless data networks. In this paper, we present a lossless and duplication free handoff scheme called LPM (Last Packet Marking) for improving Cellular If semisoft handoff. LPM signals the safe handoff cue by sending a specially marked packet to mobile hosts. SPM (Semisoft rePly Message) is the only newly introduced control packet. Our performance study shows that LPM achieves lossless packet delivery without duplication and increases TCP throughput significantly.

웹기반교육에서의 자동 문제 출제 시스템

김경아,최은만,Kim, Kyung-A,Choi, Eun-Man 한국정보처리학회 2002 정보처리학회논문지 A Vol.9 No.3

인터넷이 교육분야에도 활발히 사용되면서 자료검색부터 동영상 강의 나아가 인터넷을 통해 실시간으로 시험을 치르고 있다. 웹을 이용한 원격시험에 출제되는 문제들은 대부분 고정출제나 문제은행방식을 이용한 무작위 출제방식을 사용하고 있다. 본 논문의 문제은행시스템은 마크업 언어를 모르더라도 문제를 제작할 수 있으며, 웹 상에서 시험을 치르고난 후 정답률에 기초하여 난이도를 자동으로 재조정할 수 있다. 또한 학습자는 시험이 끝난뒤 피드백 학습을 할 수 있으며, 학습 후에는 학습자가 스스로 난이도를 조정하여 재시험을 치를 수 있게 하였다. 자동난이도 출제 방식은 출제가 간편해지며 평가의 예상평균점수를 미리 예측하고 시험결과가 계속 문항마다 누적되어 이를 바탕으로 출제되는 문제가 너무 쉽게 또는 너무 어렵게 출제되는 것을 막을 수 있다. 또한 원격시험은 대리시험 등 부정의 소지가 많아 유형이 다른 문제를 출제하게 되는데 여기서 오는 형평성 문제를 극복할 수 있게 된다. Internet has been applied to the educational field such as data search, lecture by motion picture, realtime examination. Most questions made for these remote examinations use methods of making questions randomly using fixed questions or item pools. The designed system in this paper makes questions without knowing MARK-UP language and after undergoing examinations on Web. Also it readjusts degree of difficulty automatically on the basis of the rate of correct answers. In addition, this enables learners to perform feedback learning after examinations and subsequently learners themselves to adjust their degree of difficulty and undergo reexaminations. The automatic selection system makes it easy to select questions, possible to expect average marks and number of questions made, and to prevent that questions may be made too easy or too hard. For a remote examination, as there are much possibilities of dishonesty such as examination by proxy so different types of problems are made, and problems of the rationality caused from that can be avoided.

소아물리치료사와 소아작업치료사의 보조공학 활용 수준 및 자신감

김경아,정동훈,Kim, Kyoung-A,Jeong, Dong-Hoon 대한물리치료학회 2013 대한물리치료학회지 Vol.25 No.1

Purpose: This study sought to identify the utilization and confidence in assistive technology (AT) for pediatric physical therapists (PPTs) and pediatric occupational therapists (POTs) for the purpose of improving the utilization of AT in clinics. Methods: The subjects of this study were 167 therapists (98 PPTs and 69 POTs) who work at general hospitals, welfare centers, facilities for the disabled, and special education schools in Seoul and Gyeonggi province. The frequency analysis and chi-squared test were used. Results: This study found that both PPTs and POTs recognize that AT benefits infants with disabilities; however, they show low confidence in using AT. Applications of AT are concentrated on wheelchairs for mobility and assistance with seating position, with orthotics/prosthetics for both purposes. POTs were found to use a wider variety of AT devices. While both PPTs and POTs frequently select/recommend devices, both groups are less involved with delivery methods, manufacture of devices, and education on AT use. Conclusion: These findings show the actual conditions of utilization and confidence in AT of PPTs and POTs deeply involved with AT, and emphasize that AT training is essential for pediatric treatment by comparing domestic and foreign studies.

직업과 결핵과의 관계

김경아,Kim, Gyeong-A 대한산업보건협회 1996 산업보건 Vol.104 No.-