DISCOVERY OF A FAINT QUASAR AT <i>z</i> ∼ 6 AND IMPLICATIONS FOR COSMIC REIONIZATION

Kim, Yongjung,Im, Myungshin,Jeon, Yiseul,Kim, Minjin,Choi, Changsu,Hong, Jueun,Hyun, Minhee,Jun, Hyunsung David,Karouzos, Marios,Kim, Dohyeong,Kim, Duho,Kim, Jae-Woo,Kim, Ji Hoon,Lee, Seong-Kook,Pak, IOP Publishing 2015 ASTROPHYSICAL JOURNAL LETTERS - Vol.813 No.2

<P>Recent studies suggest that faint active galactic nuclei may be responsible for the reionization of the universe. Confirmation of this scenario requires spectroscopic identification of faint quasars (M-1450 > -24 mag) at z greater than or similar to 6, but only a very small number of such quasars have been spectroscopically identified so far. Here, we report the discovery of a faint quasar IMS J220417.92+011144.8 at z similar to 6 in a 12.5 deg(2) region of the SA22 field of the Infrared Medium-deep Survey (IMS). The spectrum of the quasar shows a sharp break at similar to 8443 angstrom, with emission lines redshifted to z = 5.944 +/- 0.002 and rest-frame ultraviolet continuum magnitude M-1450 = -23.59 +/- 0.10 AB mag. The discovery of IMS J220417.92+011144.8 is consistent with the expected number of quasars at z similar to 6 estimated from quasar luminosity functions based on previous observations of spectroscopically identified low-luminosity quasars. This suggests that the number of M-1450 similar to 23 mag quasars at z similar to 6 may not be high enough to fully account for the reionization of the universe. In addition, our study demonstrates that faint quasars in the early universe can be identified effectively with a moderately wide and deep near-infrared survey such as the IMS.</P>

서울의 Penicillinase Producing Neisseria Gonorrhoeae 발생빈도(1996)

김재홍,황동규,전재홍,김윤석,김중환,김용준,이창균,임동진,김현수,조창근,김경문,박상훈,전우형,김희성,이호정,차명수,김갑형,김형석,김석우,황지환,박병순,권오상,이민수,송기훈,성소영,이인섭,부태성 대한화학요법학회 1999 대한화학요법학회지 Vol.17 No.2

Background : In recent years, gonorrhea has been panedemic and remains one of the most commom STDs in the world, especially in developing countries. Objective & Methods: For the detection of a more effective therapeutic regimen and assessing the prevalence of PPNG, we have been trying to study the patients who have visited the VD Clinic of Choong-Ku Public Health Center in Seoul since 1980 by means of the chromogenic cephalosporin method. Results: In 1996, 139 strains of N. gonorrhoeae were isolated, among which 53(39.0%) were PPNG. Conclusion: Our results suggests that after a peak of 74.3% in 1993, the prevalence of PPNG in Seoul is gradually declining.

Covid-19 이후 중소·벤처기업 지원 정책의 전환과 설계

김선우(Sunwoo Kim),송명진(Myongjin Song),오윤환(Yoonhwan Oh),홍정임(Jung-Im Hong),정효정(Hyojung Jung),진우석(Wooseok Jin),이장재(Jang-jae Lee),김문선(Moon Sun Kim),박진서(Jinseo Park),이준영(June Young Lee),이태준(David Lee),김주희(Ju- 과학기술정책연구원 2022 정책연구 Vol.- No.-

It is necessary to change SME and entrepreneurship policy responses to COVID-19. Despite the development of vaccines and remedies, COVID-19 is expected to be associated with humankind with influenza-like infectious diseases rather than termination, and ‘with Corona’ is understood as a new normal. The effects of COVID-19 is ① diffusion of an untact culture, ② promotion of digital transformation, ③ acceleration of the 4th industrial revolution, and ④ increased interest in health and the environment. The damage to SMEs caused by COVID-19 varies by industry. Corporate damage from COVID-19 has emerged in all industries, with the education services and other personal services industries suffering the most. COVID-19 is accelerating the 4th industrial revolution and accelerating changes in the industrial structure. The transformation of the industrial structure is progressing at different speeds and ranges for each industry. If existing companies are still leading smartization, there are still no major changes in the industrial structure. Platform companies and start-ups are pioneering the breakthroughs in industrial structures such as digital healthcare and legal tech, and the creation of new industries (fintech, autonomous vehicles, etc.). The governments SME policy direction will be strengthened from Smart-Up, Start-Up, and Stand-Up to Sum-Up, Scale-Up, and Value-Up based on the direction of industrial transformation. I would like to present the direction of change in the existing industrys Smart-Up, the new industrys Start-Up, and the digital governments Stand-Up strategy. This research consists of the content that proposes the conversion of SME support (Chapter 3-4) and the content that implements the digital government discussed on the global level (Chapter 5). Specifically, Chapter 2 analyzes the Moon Jae-in governments SME policies not only qualitatively but quantitatively. Chapter 3 presents the technological level of smart manufacturing in Korea through papers and patents, and presents the current status and the direction of improving the dissemination of smart factories. Chapter 4 raises the number of strategic investors and activation of M&A as main issues for the scale-up of startups, and diagnoses the current status and problems. Chapter 5 reviews the OECD Digital Government Index and examines cases in data-driven administration of major countries. In addition, we diagnose problems from the current state of digital government innovation in South Korea. Chapter 6 presents the direction of the new governments SME policy. There are three directions for the next governments SME policy to change. The first is to diversify the SME support method based on innovation. Second, promote open innovation, for example co-operatives. Third, accelerate the digital conversion of policy support. The next governments SME policy issues are as follows. We will reorganize the laws and regulations related to SMEs. Reorganize the growth-oriented certification and verification system and diversify corporate R&D support. Extend the ‘EXIT’ of the startup ecosystem. Promote cooperative R&D and transform into an ecosystem that fosters local businesses. Make manufacturing companies smarter and strengthen the capabilities of smart manufacturing professionals. Design a data-driven SME policy, collect data to support data-driven SMEs, and conduct an integrated survey.

난소 및 난소 종양 염전의 초음파 소견

오연희,이현경,이원재,이성우,박수성,윤혜원,임문환,심재철,김용탁,김성숙,김정란 동국대학교 경주대학 1993 東國論集 Vol.12 No.-

Acute torsion of the ovary and ovarian mass is a recognized surgical emergency, but rarely has the diagnosis been made preoperatively on the basis of imaging studies. The sonographic findings in 14 cases of surgically proven torsion of the ovary and ovarian mass are described. Mostly cystic ovarian mass, engorged vessel, dilated uterine tube, beak-like echo(torsion site), smooth mass wall thickening an free-fluid collection in cul-de-sac are described. More significant in terms of specificity were the demonstration in 6 cases(42.9%) of the smooth mass wall thickening and in 8 cases(57.1%) of a free fluid in the cul-de-sac. We report the sonographic findings of ovary and ovarian mass torsion that may suggest the preoperative diagnosis of this condition.

여호와의 증인 환자에서 산과적 출혈 후 무수혈 치료 2예

김재령,여소진,이해혁,김정식,김태희,남계현,이권해,이임순,박진화,황경호 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2

Jehovah's Witness comprise a unique obstetric population. Their refusal of blood stems from an interpretation of a literal translation of the Bible, and it is this belief that puts them at an increased risk of morbidity and mortality if hemorrhage occurs. We report two cases of a Jehovah's Witness who bled massively due to obstetric hemorrhage, refused blood transfusion and had profound anemia. The patients were treated with recombinant human erythropoietin, parenteral iron and oxygen. And they were treated on an intensive care unit with intermittent positive pressure ventilation. We reviewed with literature considering the therapy for acutely anemic patients who refuse transfusion to decrease the duration of the most severe anemia.

상악 유전치부의 치간공간과 인접면 우식에 관한 조사연구

김진영,이광희,라지영,안소연,정승열,임경욱,반재혁 大韓小兒齒科學會 2009 大韓小兒齒科學會誌 Vol.36 No.3

본 연구는 상악 유전치부의 치간공간과 인접면 우식의 상관관계를 평가해보고자 하였다. 익산에 거주하는 만3-7세의 어린이 555명을 대상으로 하였으며 탐침이 통과하는지 여부로 치간공간이 있음과 없음으로 분류하였고 와동이 형성되었거나 법랑질 표면이 연화되었을 경우 인접면 우식이 존재하는 것으로 판단하였다. 연구 결과 다음과 같은 결론을 얻었다. 1. 상악 유전치부의 치간공간은 영장류 공간이 77.4%, 발육공간이 유측절치와 유중절치 사이에서 54.4%, 양유중절치 사이에서 39.0%로 나타났다. 2. 인접면 우식발생율은 우측유견치가 6.3%, 우측유측절치가 14.7%, 우측유중절치가 33.5%, 좌측유중절치가 33.7%, 좌측유측절치가 16.0%, 좌측유견치가 4.7%로 나타났다. 3. 치간공간의 수가 많을수록 상악 유전치의 우식발생율은 낮아졌으나 그 상관관계(r=0.024)는 미약하였다. 4. 상악 유전치부에 공간이 존재하지 않을 경우 존재할 때 보다 평균 우식발생율이 높았으며, 치간공간이 전혀 존재하지 않는 경우 한 곳이라도 치간공간이 존재하는 경우보다 평균 우식발생율이 2배 이상 높은 것으로 나타났다. The purpose of this study was to assess the relationship between interdental spaces and proximal caries in maxillary anterior primary teeth. 555 children aged 3-7 inhabit in Iksan were divided into two groups, depending on the presence of interdental space which was detected by a dental explorer. They were determined to have proximal caries if cavity was formed or the enamel surface was softened. The results were as follows : 1. Regarding interdental spaces, 77.4% had primate spaces; 54.4% had developmental spaces between central and lateral incisor, and 39.0% between central incisors. 2. Interproximal caries incidences in right primary canine, lateral incisor, and central incisor were 6.3%, 14.7%, and 33.5%, respectively. Also interproximal caries incidences in left primary central incisor, lateral incisor, and canine were 33.7%, 16.0%, and 4.7%, respectively. 3. Children with more interdental spaces had less caries incidence, but the relationship was weak(r=-0.024). 4. The mean caries incidence was higher in absence of interdental space of maxillary primary incisors than in presence of space. The mean caries incidence with no interdental space was twice as high as that with presence of interdental space.

기업 전략과 정보시스템 전략이 기업 성과에 미치는 영향

김재전,김임곤,이석인,소순후 한국정보전략학회 1998 한국정보전략학회지 Vol.1 No.1

근관소독제의 세포독성에 관한 연구

김재구,임미경 大韓齒科保存學會 1993 Restorative Dentistry & Endodontics Vol.18 No.1

토양산성화에 따른 양이온 교환능력 특성에 관한 연구

金惠影,李在鎔,任齊彬 全北大學校 附設 都市및環境硏究所 1996 都市 및 環境硏究 Vol.11 No.1

The purpose of this study is to survey the pH variation of the soils, cation exchange capacity and organic matter by acid rain or acid matter, which is a cause of solid acidification. Three different soils were collected from paddy fields soil, fields soil and forest soil in Chon ju city. Artificial acid rain samples were made in distilled water with sulfuric acid. The pH are controlled pH 3.3 In this study, cations : H^+, Ca^2+, Mg^2+, Na^+, Al^3+ were analyzed. These ions are believed to be the major ions playing an important role in affecting acidity in rain. The cation exchange capacity(CEC) and organc matter were analyzed by Methods of Soil Analysis Part 2. The major ions were measured by ion chromatography and inductively coupled plasma(ICP) From the results, the following coclusions were derived. 1) In this batch test, it is identified that soil from paddy fields showed the pH variation of testing and the pH was 8.01 2) Exchangable cations, : Ca^2+, Mg^2+, Na^+ were measured in paddy fields soil, too. Their quantities were five times more than in other soils. 3) Aluminum ion having toxicity to plant-vegetation was eluted under pH 3. As it was eluted the very smallest quantity in the paddy fields soil, the paddy fields soil is hardly influenced by aluminum ion. 4) Most of all organic matters were measured at Paddy fields soil most of all. this has the smaller adsorption any other soils.

CFRP적층쉘의 적층구성 및 곡률반경에 따른 관통특성

임광희,조영재,이길성,심재기,김영남,양인영 朝鮮大學校 機械技術硏究所 2004 機械技術硏究 Vol.7 No.1

최근 탄소섬유 강화 복합재료(이하 CFRP)는 비강도, 비강성이 높아 경량화가 요구되는 우주항공분야에서 구조용 재료로 널리 이용되고 있다. 본 연구에서는 CFRP 적층쉘의 적층구성 및 곡률반경에 따른 관통 특성을 고찰 하고자 한다. 실험에 사용된 복합재료는 일방향 프리프레그시트로서 적층방법은 〔0₃/90₃〕, 〔0₂/90₂〕s,와 〔0₂/90₃/0〕s, 〔0/90₂/0〕 2계면과 4계면으로 적층하였다. 그리고 다양한 곡률 반경을 적용하였다. (R= 100, 150, ∞). 적층순서에 맞게 적층된 시험편은 경화온도 130℃에서 진공백 성형과정을 오토클레이브로 제작 하였으며 100x140mm 크기로 절단 하였다. 시험편은 강구로 관통시켰으며 ballistic-screen sensor로 속도를 측정하여 충격전 운동에너지와 충격 후 운동에너지를 구할 수 있다. 흡수에너지는 곡률이 커질수록 증가하였으며 4계면 시험편보다 〔0₃/90₃〕s 와 〔0₂/90₂〕s 적층구조를 갖는 2계면 시험편이 흡수에너지가 더 높게 나왔다. Currently, carbon-fiber reinforced plastics (CFRP) are widely used in both space and civil aircraft due to their superior stiffness and strength to weight ratios compared to conventional metallic materials. This paper is to study the effects of curvature and staking sequence on the penetration characteristics of CFRP laminated shell. Composite laminates used in this test are CFRP orthtropic laminated plates, which are stacked with two-interfaces 〔0₃/90₃〕s, 〔0₂/90₂〕s and 〔0₂/90₃/0〕s. 〔0/90₂/0〕s. They are manufactured to varied curvature radius (R= 100. 150, 200 mm and ∞). They are cured by heating to the appropriate hardening temperature(130℃) by mean of a heater at the vacuum bag of the autoclave. Test specimens were prepared with dimensions 100mmx140mm. When the specimen is subjected to transverse impact by a steel ball, the velocity of the steel ball was measured both before and after impact by determining the time for it to pass two ballistic-screen sensor located a known distance apart. Absorbed energy increased as the curvature increased. 〔0₃/90₃〕s and [0₂/90₂〕s specimens, which is small interlaminar number, was higher than fore interlaminar specimen.