A Novel Spectral Analysis of Ultrashort Pulse Transmission Using the Pulse-Ordering Concept

Jae-hong,Hi-chang Chung,Jin-sung Jun,Yong-sun Oh The Korea Institute of Information and Commucation 2000 韓國通信學會論文誌 Vol.25 No.7

In this paper, we analyze transmission characteristics of ultrashort laser pulses using the properties of high-order pulses which are systematically obtained following their orders. The high-order pulses are easily derived from a modified PRS system model. But we make clear they are very useful to cover wider area and to show more accurate transmission characteristics of ultrashort pulses than Gaussian or Sech pulse approximations used conventionally. These are based on the fact that the spectra and bandwidths of the high-order pulses are geautifully related to their orders. First modifying the generalized PRS system model, we propose a new model for deriving any type of high-order pulse. And we offer a novel analysis method of ultrashort pulse transmission varying the order of the pulse from n=1 to n=100, we obtain spectra of ultrashort pulses with 1(ps)∼150(fs) FWHM's, which are widely used in optical pulse communications. One-step further, we derive PSD's of their pulse-tr ins when they are applied to Unipolar signaling scheme. These PSD's are decided in the range of possible pulse intervals. All of these results are not only coincided with some conventional experimental works but will be applied to any pioneering ultrashort pulse in the future.

김종철 초기 시의 가톨릭 세계관에 대한 일고찰-「죽음의 둔주곡」과 「떠도는 섬」을 중심으로-

김재홍 ( Kim¸ Jae-hong ) 한양대학교 동아시아문화연구소 2021 동아시아 문화연구 Vol.86 No.-

김종철 시인은 1968년 『한국일보』 신춘문예에 「재봉」이, 1970년 『서울신문』 신춘문예에 「바다 변주곡」이 각각 당선되어 시단에 등장했으며, 2014년 지병으로 작고하기까지 46년 동안 시작 활동을 했다. 그는 생전에 간행한 모두 7권의 시집과 유고시집 『절두산 부활의 집』 등 8권의 단독 시집, 형인 김종해 시인과 함께 간행한 형제시인 시집 『어머니, 우리 어머니』, 시선집 『못과 삶과 꿈』, 『못 박는 사람』 등을 상재한 바 있다. 베트남전쟁에 참전했던 김종철 시인은 첫 시집『서울의 유서』의 대표작 「죽음의 둔주곡」을 모두 9곡 205행의 작품으로 완성하였다. 이 시는 대위법 형식의 악곡인 둔주곡에 맞춰 각 곡과 곡에 죽음과 죽음의 이미지를 연쇄적으로 제시하고, 그 이미지들을 서로 겹치고 중첩시키면서 비극성을 강화하고 비장미를 심화시키는 방향으로 전개된다. 또 두 번째 시집『오이도』의 대표작 가운데 하나인 「떠도는 섬」도 11개로 구분된 단편 서정시들이 모두 181행에 이르는 시행을 포함하는 작품이다. 이 시는 전반적인 내용과 그 분량 면에서 두 번째 시집을 대표할 뿐만 아니라, 특별히 ‘오이도’ 연작 7편을 개관하는 의욕적인 작품이다. 본고에서는 김종철의 초기 시를 대표하는 「죽음의 둔주곡」과 「떠도는 섬」을 중심으로 그의 세계가 가톨릭의 바탕 위에 성립되었다는 점을 확인하고, 그것은 믿음의 윤리화이자 윤리의 신앙화라고 할 수 있음을 살펴보았다. 김종철에게 가톨릭 세계관은 무엇보다 ‘계시의 믿음’ 자체이지만, 그것의 작품화인 「죽음의 둔주곡」과 「떠도는 섬」은 믿음의 실천이자 믿음의 윤리화였다. Poet Kim Jong-chul received the ‘Hankook ilbo Spring Literary Award’ with ‘Jaebong(sewing)’ in 1968 and ‘Seoul Newspaper Spring Literary Award’ with ‘Sea Variations’ in 1970 and so began his literary career. Before his death as a chronic disease in 2014, he had done the poetical works for 46 years. In his lifetime, he published the seven collections of poetry, eight poems including the posthumous collection, “The House of Revival of Jeoldusan”, a sibling collection of poems along with his elder brother Kim Jong-hae “Mother, Our Mother” and a collection of poems “Nails and Life and Dreams” and “The Man Who hammer Nails.” Poet Kim Jong-chul who participated in the Vietnam War completed ‘The Fugue of Death’ which was the representative work of the first collection of poems “The Will of the Seoul” with nine songs and 205 lines. This work was unfolded to present a series of images of death and death to each song and song in line with fugue, a musical piece in the form of a counterpoint, and to strengthen tragedy and deepen the tragic beauty by overlapping and duplicating the images. And ‘The Floating Island’, one of the representative works of the second collection of poems “The Oido(Oi Island)” was a masterpiece that includes a total of 181 verses of short lyric poems of 11 features. From the perspective of the overall content and quantity, this work not only represented the second collection of poems, but it was also a highly motivated work that overviewed seven series of “Oido”. In this paper, through the analysis of Kim Jong-chul’s early major poems, ‘The Fugue of Death’ and ‘The Floating Island’, it confirmed that his world was established on a Catholic basis, it regarded an ethicalization of faith and a religious belief in ethics. Although the Catholic world view is for Kim Jong-chul the ‘belief in revelation’ itself, to made it into a work of art, ‘The Fugue of Death’ and ‘The Floating Island’ were the practice of faith and the ethnicise of faith.

Highly conductive and flexible fiber for textile electronics obtained by extremely low-temperature atomic layer deposition of Pt

Lee, Jaehong,Yoon, Jaehong,Kim, Hyun Gu,Kang, Subin,Oh, Woo-Suk,Algadi, Hassan,Al-Sayari, Saleh,Shong, Bonggeun,Kim, Soo-Hyun,Kim, Hyungjun,Lee, Taeyoon,Lee, Han-Bo-Ram Springer Science and Business Media LLC 2016 NPG Asia Materials Vol.8 No.-

Synthesis of aerosol nanoparticles by spark discharge and applications

Jaehong Park,Jeong Hoon Byeon,Ki Young Yoon,Jae Hong Park,Jungho Hwang 한국입자에어로졸학회 2009 Particle and Aerosol Research Vol.5 No.3

activation with Pd and Pt aerosol nanoparticles produced by spark discharge was introduced. After annealing, the catalytically activated substrate placed into a solution for electroless silver deposition. The silver was then formed only on the activated regions of the substrate. Silver line patterns having a width of 18 μm and a height of 1 μm were created with the ability to be effectively reproduced. Antimicrobial nanoparticles such as silver were used for removal of bioaerosols. Silver nanoparticles deposited air filters such as ACF filters were evaluated by antimicrobial test.

Sex and Age Differences in Psychiatric Disorders among Children and Adolescents: High-Risk Students Study

JaeHong Park,YoungRong Bang,ChulKwon Kim 대한신경정신의학회 2014 PSYCHIATRY INVESTIGATION Vol.11 No.3

Objective-The aims of the present study are to investigate the rate of the psychiatric disorders in psychiatrically high-risk children and adolescents and to examine sex and age differences in the diagnosis of psychiatric disorders. Methods-The participants included students aged 6–16 from the 27 elementary and the 45 middle schools in Busan, Korea. We screened psychopathology using the Korean version of Child Behavior Checklist (K-CBCL) or the Youth Self Report (K-YSR). A total of 2,912 students were selected as high-risk students on the basis of cut-off scores (T-score ≥60) for a total behavior problem score of KCBCL/ K-YSR. Of these high-risk students, 1,985 students participated in and completed individual diagnostic interviews. Psychiatric diagnosis was assessed using a Korean version of the Kiddie-Schedule for Affective Disorders and Schizophrenia. Multivariate logistic regression analysis was conducted to examine sex and age differences of psychiatric diagnosis. Results-Based on sex, boys were more likely to have ADHD and girls were more likely to have depression. Based on age, children were more likely to have ADHD and adolescents were more likely to have affective disorder, conduct disorder, psychotic disorder, and anxiety disorders except separation anxiety disorder. Conclusion-This is the largest study to conduct face-to-face interviews with subjects and parent(s) among Korean studies in this field. The present study revealed significant differences across sex and age among specific psychiatric disorders in children and adolescents. Future population-based studies will be required to ascertain the sex- and age-related differences of psychiatric prevalence.

Prognostic Factors of Recurred Hepatocellular Carcinoma after Primary Resection

Jaehong Jeong,Kwang-Woong Lee,Hae Won Lee,YoungRok Choi,Suk-Won Suh,Hyeyoung Kim,Kyung-Suk Suh,Nam-Joon Yi 한국간담췌외과학회 2014 한국간담췌외과학회 학술대회지 Vol.2014 No.4

Management Plans of Livestock Excretions from Field Scrutiny in Yeongsan Stream Basin

Jaehong Ko,Wonmo Yang,Yongwoon Lee 한국도시환경학회 2018 한국도시환경학회지 Vol.18 No.4

A field scrutiny related to livestock excretions in Yeongsan stream basin was performed in this study. This result was used to verify the accuracy of nationwide survey result (formal document) for pollution sources by comparing them, and a management plan of livestock excretions was also suggested based on their comparison in this study. The major differences between them were 17.7% in the number of stock farms, 39.6% in the population of milk cows and 41.6% in the treatment method of pig excretions. The biggest difference to the pig case, which is currently the most problem in livestock excretions treatment, could be because of the cause that most of the farmlands, including orchard grove, used as individual treatment site for excretions played role as a dump site to reduce the cost for consignment treatment. Meanwhile, the 67% of compost heaps was illegally left alone in field without the rain shelter and could flow in the stream if it is raining.

A Study on Subjective Evaluation of Appropriate Gesture for Smart TV commands

Jaehong Lee,Sanghyun Kwon,Ilsun Rhiu,Jaehyuk Yang,Taebeum Ryu,Myung Hwan Yun 대한인간공학회 2012 대한인간공학회 학술대회논문집 Vol.2012 No.11

Objective: The purpose of this study is to analyze the types of commands are appropriate to gesticulate when controlling a smart TV. Background: Previous studies on gesture interface could be classified into three approaches; (1) contextual approach: how to suggest appropriate gesture based on the use case, (2) technological approach: how to implement gesture interface effectively and efficiently, (3) relationship approach: how to find the contextual association between command and gesture. However few studies exist emphasize the ‘gesture-ability’ of commands. Method: The experiment was conducted to understand the relationship between ‘gesture-appropriate score’ and ‘command variables’. For the experiment, eighty seven commands of smart TV were collected and three command variables (‘frequency’, ‘depth’, ‘type’) were selected. Also, levels of each command variable were classified. Results: Gesture-appropriate scores were significantly different between the levels of each command variable. The optimal levels of each command variable were suggested by conducting multiple linear regressions. Conclusion: From the results, we found that high frequency level, low depth level, navigation/move type commands were preferred as a gesture interface. Application: With the results of this study, the designers of gesture interface are able to consider the important command variables for designing gesture interface.

The formation of bioactive periodic surface structure of Ti6Al4V coated with hydroxyapatite by femtosecond laser

Jaehong Lee(이재홍),Seung-Hoon Um(엄승훈),Min-Young Na(나민영),Hye-Jung Chang(장혜정),Hyung-Seop Han(한형섭),Yu-Chan Kim(김유찬),Hojeong Jeon(전호정) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11

Ti alloy, which be commonly used in medical implants for hard tissue, has high corrosion resistance from body fluid. Nevertheless, Ti alloy has been considered as a bio-inert material which might form fibrous tissue and have low osseointegration because of Ti oxide film formed naturally in oxygen environment. To improve the osseointegration, surface roughness and structure modification of bio-inert Ti alloy has been attempted. And currently, the surface modification by laser has been developed for laser induced periodic surface structure (LIPSS) to provide nano/micro scale cell favor morphology to bone cells. However, the bio-inert property inherently cannot be changed to bio-active. In this study, using LIPSS, we coated hydroxyapatite on surface of Ti6Al4V to provide nano/micro scale bio-active morphology to bone cells. The hydroxyapatite coatings on LIPSS were observed and analyzed by SEM, EDX, XRD and TEM. Additionally, the improved cell attachment was showed on LIPSS coated with hydroxyapatite.

Magnetic excitations in d<SUP>7</SUP> j<SUB>eff</SUB>=1/2 Kitaev honeycomb materials, Na₃Co₂SbO<SUB>6</SUB> and Na₂Co₂TeO<SUB>6</SUB>

Jaehong Jeong,Chaebin Kim,Gaoting Lin,Shinichiro Asai,Takatsugu Masuda,Jie Ma,Je-Geun Park 한국자기학회 2020 한국자기학회 학술연구발표회 논문개요집 Vol.30 No.1