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쟐로신스키-모리야 상호 작용 측정을 위한 광자기 커르 효과 현미경 측정법 개발
김대연(Dae-Yun Kim),김덕호(Duck-Ho Kim),박민호(Min-Ho Park),최석봉(Sug-Bong Choe) 한국자기학회 2017 韓國磁氣學會誌 Vol.27 No.5
We report here an experimental scheme based on a magneto-optical Kerr effect microscope to measure asymmetric domain-wall (DW) speed induced by Dzyaloshinskii-Moriya (DM) interaction. In this scheme, the possible artifacts caused by the in- and out-ofplane electromagnets are analyzed and carefully removed. The present scheme is then applied to measure the asymmetric DW speed of two different Pt/Co/Pt magnetic films with different magnetic layer thicknesses. In thinner magnetic film, the DW speed is well characterized by the DW energy variation model, enabling us to determine the magnitude of the effective in-plane magnetic field induced by the DM interaction. On the other hand, in the thicker film, the DW speed shows additional asymmetry, which is possibly caused by the variation of physical parameters other than the DW energy.
김윤석(Yun Seok Kim),김대연(Dae Yun Kim),남소현(So Hyun Nam),김성철(Seong Chul Kim),김인구(In Gu Kim) 한국간담췌외과학회 2009 한국간담췌외과학회지 Vol.13 No.2
Purpose: Mesenchymal hamartoma of the liver (MHL) is an uncommon benign disease of childhood, yet its biology and pathogenesis are still unknown. It is difficult to diagnose from other hepatic tumors, and malignant transformation can occur. It has caused a debate regarding choice of the proper management of each neoplasm of liver in childhood. Methods: We analyzed histologically confirmed MHLs from 1998 to 2008. Results: Six patients presented at a median age of 21months, with a painless abdominal mass. Gastrointestinal symptoms were present in two patients. Abdominal ultrasonography and CT scans revealed a cystic, septated mass within the liver in all patients. Three patients underwent major hepatic resections, one had a simple excision of the tumor, and two were observed after biopsy. The median follow up period was 46months (range 6-115months), and there were neither recurrences of tumors nor complications, in patients who underwent surgical treatment. Conclusion: Resectable mesenchymal hamartoma of the liver in childhood with normal liver function studies can be cured by complete excision without complications and without recurrence.
젊은 여성에서 발생한 초기 자궁내막암의 고용량 progestin의 치료효과
조윤현 ( Yun Hyun Cho ),서대식 ( Dae Shik Suh ),지용일 ( Yong Il Ji ),김대연 ( Dae Yeon Kim ),김종혁 ( Jong Hyeok Kim ),김용만 ( Yong Man Kim ),김영탁 ( Young Tak Kim ),남주현 ( Joo Hyun Nam ) 대한산부인과학회 2007 Obstetrics & Gynecology Science Vol.50 No.3
목적: 자궁내막암은 점차 증가하는 추세로 본 연구에서는 가임력을 요구하는 젊은 여성에 있어 보존적 치료 방법으로 고용량의 progestins의 치료 효과를 살펴보고자 하였다. 연구방법: 1998년 4월부터 2005년 10월까지 서울아산병원 울산대학교 산부인과교실에서 진단 및 치료를 받은 환자들 중 고용량의 progestins으로 보존적 치료를 시행한 10명의 환자를 대상으로 치료 적응증, 치료 방법, 치료 평가 방법, 치료 기간, 재발 유무에 대한 조사를 하였다. 결과: megestrol acetate 80-160mg의 용량 혹은 medroxyprogesterone acetate 500-1,000 mg의 용량으로 호르몬 치료를 시행하였으며 7명 (70.0%)의 환자가 치료에 반응을 보였고 4명의 환자가 임신에 성공하였다. 3명의 환자가 근치적 자궁절제술을 시행 받았으며 모든 환자가 재발의 근거 없이 경과 관찰 중이다. 결론: 가임력을 원하는 초기 자궁내막암 환자에서 고용량의 progestins 치료는 정기적인 치료 평가와 적절한 경과 관찰 하에 일차적 치료로 이용될 수 있으리라 사료된다. Objective: The aim of this study is to investigate the effectiveness of high dose progestins in young patients with early stage of endometrial cancer. Methods: Between April 1998 and December 2005, 10 women with early stage of endometrial carcinoma were treated with high dose progestins as primary therapy for the purpose of saving fertility. Results: They took 80~160 mg of megestrol acetate or 500~1,000 mg of medroxyprogesterone acetate per day, and then followed up with the endometrial curettages. Seven patients (70.0%) responded to the treatment. Three patients didn`t respond and so underwent hysterectomy as definite treatment. Four patients were able to become pregnant after completing treatment. No patients died of their disease. Conclusion: The majority of patients with well-differentiated endometrial adenocarcinoma who underwent conservative treatment with a progestational agent responded to the treatment. High-dose progestin therapy can be used as primary therapy in selected young women with early stage of endometrial carcinoma.
발달장애아동의 심리사회발달을 위한 사회성숙도 검사의 효과검증
형구암(Ku Am Hyung),김대연(Dae Yun Kim),김기범(Ki Beom Kim) 한국발육발달학회 2011 한국발육발달학회지 Vol.19 No.1
The purpose of this study was to identify validity of Vineland Social Maturity Scale(Doll, 1991) for ADHD children. For this purpose, the total of 259 ADHD children in seoul were recruited. Item Goodness-of-Fit of row data was analyzed to know difficulty and unidimensionality of items using the Rasch`s rating scale model and FACETS program. The results of this study were as follows. First, the items that can distinguish sociality in ADHD children were 54 except 2 items(no. 29 and 37) from no. 26 to 86 among total of 100 items. Second, items that obtain reliability of consistency(infit mean square 0.7-1.3) were 24 among 54 items. Third, there were statistically significant differences for each items of SMS to distinguish ADHD children by genders so that proper consideration is required. Fourth, each of SMS items can distinguish ADHA children`s age, social age, and the degree of disability properly. To conclude, it is confirmed that the items of Vineland Social Maturity Scale(SMS) which is developed for normal people can also be used for ADHD children properly.
김병준,최현범,이한협,이동한,김대연,권일범,Kim, Byung-Jun,Choi, Hyun-Beom,Lee, Han-Hyub,Lee, Dong-Han,Kim, Dae-Yun,Kwon, Il-Bum 한국광학회 2003 한국광학회지 Vol.14 No.2
높은 peak 값의 광 펄스 신호를 얻기 위하여 대역통과 필터(band pass filter)를 사용한 2단 구조 erbium-doped fiber amplifier (EDFA)를 구성하여 125 W peak 값과 32 ㏈ 소광비(extinction ratio)를 갖는 펄스 신호를 얻었다. 이때 pulse off power는 79 ㎽이다. pulse off power를 낮추고 소광비를 높이기 위하여 nonlinear optical loop mirror(NOLM)을 사용하였다. NOLM 을 통과한 펄스 신호는 35 W peak 값과 0.3 ㎽ pulse off power, 50.4 ㏈ 소광비를 갖는다. A two-stage erbium-doped fiber amplifier (EDFA) with a band pass filter is used to get optical pulses of high peak value. The pulse signal has a 32 ㏈ extinction ratio, 125 W peak power and 79 ㎽ pulse off power. A nonlinear optical loop mirror (NOLM) is used to lower the pulse off power so as to increase the extinction ratio. The pulse signal after the NOLM has a 50.4 ㏈ extinction ratio, 35 W peak power and 0.3 ㎽ pulse off power.
2단 광섬유 증폭기를 이용한 효율적인 고출력 펄스 증폭
김병준,이한협,최현범,이동한,김대연,권일범,Kim, Byung-Jun,Lee, Han-Hyub,Choi, Hyun-Beom,Lee, Dong-Han,Kim, Dae-Yun,Kwon, Il-Bum 한국광학회 2003 한국광학회지 Vol.14 No.2
높은 출력의 peak 값을 갖는 광 펄스 신호를 얻기 위하여 2단 구조 EDFA를 구성하였다. EDFA의 첫 번째 단과 두 번째 단 사이에 대역통과 필터(band pass filter)를 삽입하여 소 신호 영역에서 높은 이득을 얻도록 하였다. 사용된 입력 펄스 신호는 100 $\mu\textrm{s}$의 주기, 10 ㎱ 펄스 폭과 1 ㎽의 peak값을 갖고, 평균 출력이 소 신호 영역에 해당하는 낮은 파워를 갖는다. 구성된 EDFA를 사용하여 83 W의 고 출력 펄스 신호를 얻었다. Nanosecond pulses are efficiently amplified by a two-stage EDFA. The EDFA employs an optical bandpass filter between stages to remove the amplified spontaneous emission of the first EDFA that strongly saturates the gain of the second EDFA. The peak power of the amplified output pulse is 83 W when that of the input pulse of 10 ㎱width and 100 $mutextrm{s}$ period is 1 ㎽.
1-3형 압전복합체를 이용한 광대역 수중 음향 트랜스듀서 개발
이경우(Lee, Kyung-Woo),소형종(So, Hyoung-Jong),임실묵(Lim, Sil-Mook),김원호(Kim, Won-Ho),김대연(Kim, Dae-Yun) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.4
Recently, it is required that acoustic transducers for underwater detection and communication sensor have wide bandwidth and low operating frequency. In this research, the new acoustic transducer is proposed. This transducer is tonpilz type, and made of 1-3 piezoelectric composites as a driving parts. The developed transducer is evaluated the TVR(transmission voltage response) and RVS(receiving voltage sensitivity) characteristics around $4{\sim}14\;kHz$ frequency range and is compared to conventional tonpilz transducer made of solid piezoelectric ceramics as a driving parts. The resonance frequency of the developed transducer is decreased by 30% and the -3 dB bandwidth is increased by 90%, compared to conventional transducer with same dimensions. The value of TVR is decreased by 9 dB and The value of RVS is the same at resonance frequency.