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결합 선로를 이용한 평판 구조의 Marchand 발룬의 합성
이종환,염경환,Lee Jong-Hwan,Yeom Kyung-Whan 한국전자파학회 2005 한국전자파학회논문지 Vol.16 No.2
평판형 결합 선로를 이용한 Marchand 발룬의 합성 기법을 제시하였다. 이러한 형태의 발룬이 갖추어야할 설계 조건에 대해서 살펴보고, 설계 조건에 부합하는 발룬의 합성을 전송선 등가회로를 통해 간편하게 모델링 할 수 있음을 보였다. 합성된 발룬은 equi-ripple 대역 통과 특성을 나타내고, 일반적 인 평판 구조에서 구현하기 어려운 평형 선로 없이도 크기가 같고 위상이 반대인 평형 신호를 얻을 수 있다. 결합 선로를 이용한 Marchand 발룬의 구현에 많이 사용되는 다중 결합 선로의 물리적 구조와 발룬의 합성에 필요한 요소값들 사이의 관계를 해석하는 방법도 소개하였다. 이상의 방법들을 이용하면 평판 구조의 다중 결합 선로를 갖는 Marchand 발룬의 체계적인 설계가 가능하다. The synthesis procedure of Marchand balun using planar coupled-line is presented. The design limitations of this type of balun have been described before its synthesis procedure. The balun has equi-ripple passband responses and balanced output without fourth balanced transmission line which is difficult to implement with conventional planar topology. As an example, 2:1 Marchand balun is designed and its momentum simulation result show good verification fur this methodology.
전력비 변화에 따른 Au Multilayer 위에 증착한 GZOB 박막의 특성
이종환,유현규,이규일,이태용,강현일,김응권,송준태,Lee, Jong-Hwan,Yu, Hyun-Kyu,Lee, Kyu-Il,Lee, Tae-Yong,Kang, Hyun-Il,Kim, Eung-Kwon,Song, Joon-Tae 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.11
We investigated the effects of power ratio on the electrical and optical properties of Au based Ga-, B- codoped ZnO(GZOB) thin films. GZOB thin films were deposited on Au based poly carbonate(PC) substrate with various power in the range from 60 to 120 W by DC magnetron sputtering. In the result, GZOB films at 100 W exhibited a low resistivity value of $1.12\times10^{-3}\Omega-cm$, and a visible transmission of 80 % with a thickness of 300 nm. This result indicated that the addition of Ga and B in ZnO films leads to the improvement of conductivity and transparent. From the result, we can confirm the possibility of the application as transparent conductive electrodes.
이종환,지미정.Jong Hwan Lee. MD. Mijung Chi. MD. PhD 대한안과학회 2014 대한안과학회지 Vol.55 No.1
Purpose: Eruptive vellus hair cysts (EVHC) are benign lesions that affect the pediatric population and are rarely seen congenitally or in young adults. EVHCs are small, cystic papules that usually occur on the chest and proximal extremities. EVHCs of the eyelids have been reported infrequently. We experienced a case of solitary EVHC that developed on the eyelid in a middle-aged male. Herein, we present our case with a brief review of the literature. Case summary: A 44-year-old male presented with a history of an asymptomatic, palpable mass in the right upper eyelid that had been slowly growing for 2 years. Physical examination revealed non-tender, firm and round mass in right upper eyelid. Computed tomography scan of the orbit showed a 7.0 × 9.0 × 9.5 mm-sized focal bulging contour in the right upper eyelid. The patient underwent sub-brow incision and excisional biopsy of the eyelid mass. Histopathological examination revealed a 7.0 × 6.0 × 4.0 mm-sized cystic structure lined by squamous epithelium containing laminated keratinous materials and multiple vellus hair shafts. There was no local recurrence during the postoperative follow-up. Conclusions: We experienced a rare case of EVHC that developed on the eyelid. Based on our experience, EVHC should be considered when determining an eyelid mass, especially around hair follicles. J Korean Ophthalmol Soc 2014;55(1):119-123
영아내사시에서 술 후 장기관찰상 양호한 양안시를 기대하려면?
이종환,백혜정.Jong Hwan Lee. MD. Hae Jung Paik. MD. PhD 대한안과학회 2014 대한안과학회지 Vol.55 No.2
Purpose: To analyze pre- and post-operative factors associated with favorable long-term sensory outcome after surgical correction for infantile esotropia. Methods: This study retrospectively examined 40 patients with infantile esotropia who underwent surgery from January 2000 to December 2010. Clinical characteristics analyzed included age at onset, age at surgery, mean preoperative deviation, amblyopia on initial visit, other associated strabismus (Inferior oblique overaction (IOOA), dissociated vertical deviation (DVD), latent nystagmus), initial and subsequent postoperative motor alignment at 1-week and 2-year follow-up, recurrence rate, and stereopsis. Long-term sensory outcome was categorized as favorable (≤400 arcsec) or unfavorable (>400 arcsec). Results: The mean follow-up period was 92.53 ± 46.46 months. There were 19 patients (47.5%) in the favorable group and 21 (52.5%) in the unfavorable group. There were no statistically significant differences between the groups with respect to age at onset or surgery, presence of amblyopia, and prevalence of IOOA and DVD, latent nystagmus, or initial postoperative alignment at 1-week. There was a tendency towards worse binocularity with larger preoperative angles of esodeviation, but it was not significant. Binocularity was significantly higher among those who had surgery at age ≤24 months than at age >24 months. Orthotropic alignment within ±10 PD at 2-year follow-up was 68.4% in the favorable group and 38.1% in the unfavorable group. Reoperation was performed on 8 patients (38.1%) in the unfavorable group and no patients (0.0%) in the favorable group. Conclusions: Surgical correction of infantile esotropia within the first 2 years of life and maintenance of orthotropic alignment within ±10 PD without additional surgery with a minimum follow-up of 2 years may be associated with favorable long-term sensory outcome in infantile esotropia. J Korean Ophthalmol Soc 2014;55(2):271-277
변증록(辨證錄) 권지십일(卷之十一)에 대(對)한 연구(硏究)
이종환,김주태,김상운,엄동명,이시형,Lee, Jong-Hwan,Kim, Joo-Tae,Kim, Sang-Un,Eom, Dong-Myung,Lee, Si-Hyeong 대한한의정보학회 2011 大韓韓醫情報學會誌 Vol.17 No.1
The topic of this study is the translation of "Byun Jeung Rok Vol.XI(辨證錄十一卷)". Byun Jeung Rok is a complete book of medicine which was written by Jin Sa tak(陣士鐸) in the early years of the Ching dynasty. Of this, the eleventh volume is composed of 6 disease-patterns(病證) and 41 subtopics. The organized characteristics of "Byun Jeung Rok(辨證錄) Vol.XI" is as follows. Chapter 1 refers to the symtom, agent and prescription of Hysterorrhea(帶下病). It explains five color Hysterorrhea; white, red, black, yellow and blue. Chapter 2 refers to the symtom, agent and prescription of Oligemic Menoschesis(血枯). It explains two cases of Menoschesis. Chapter 3 refers to the symtom, agent and prescription of Metrorrhagia(血崩). It explains eight cases of Metrorrhagia. Chapter 4 refers to the symtom, agent and prescription of Dysmenorrhea(月經不調). It explains fourteen cases of Dysmenorrhea. Chapter 5 refers to the symtom, agent and prescription of Infertilitas(不姙). It explains ten cases of Infertilitas. Chapter 6 refers to the symtom, agent and prescription of Hyperemesis(惡阻). It explains two cases of Hyperemesis. Obviously the Byun Jeung Rok(辨證錄) is one of the very important texts in the oriental medicine. But there is no exact Korean translation, so I study this six chapters and translate them into Korean. Finally, I hope this thesis can be an aid of development in the knowledge informatization of Korean medicine.