기관지확장증의 방사선학적 및 임상적 고찰

유정근 대한영상의학회 1985 대한영상의학회지 Vol.21 No.5

Bronchiectasis means a permanent abnormal dilatiation of one or more large bronchi owing to destruction of the elastic and muscular components of the bronchial wall. Radiological study is the most important and mandatory procedure. Especially bronchography is essential for the definitive diagnosis of bronchiectasis and for the precise delineation of the type and extent of the disease. The radiological and clinical findings of 48 cases of bronchiectasis diagnosed by bronchography and treated at Chosun University Hospital during the 5 years from January 1980 to December 1984 were analyzed retrospectively. The results were as follows; 1. Among the 48 cases, 34 cases(70.8%) were male and 14 cases(29.2%) were female. Peak incidence was in second decade. 2. Chronic cough, productive squtum and hemoptysis are main symptoms and others are chest pain, dyspnea and recurrent bout of pneumonia. The most common physical sign is persistent moist rales over the involved area in 23 cases(47.9 ). Others are no sign in 17 cases(35.4%), wheezing in 11 cases(22.9%) and digit clubbing in 3 cases(6.3%). 3. The presumed causes were composed of not known in 30 cases(62.5%) and complications of measles in 7 cases(14.6%), pertussis in 5 cases(10.4%) and pneumonia in 4 cases(8.3%). Two cases were Kartagener's syndrome and unilateral hyperlucent lung. 4. Plain chest roentgenographic findings were abnormal in 42 cases(87.5%) but normal in 6 cases(12.5%). The most comon radiological finding was accentuation of lung marking in 36 cases(85.7%), the others are include in order of frequency, pneumonic infiltration, linear radiolucencies, cystic radiolucencies, decreased affected lung volume, air-fluid level and pleural thickening. 5. Bilateral bronchiectasis was demonstrated in 11 cases(22.9%) and the disease was much more often involved left lung than right. The most commonly involved lobe is left lower lobe, and the most common site of involvement was the posterior basal segment of the l wer lobe. The type of bronchiectasis is cylindrical in 22 cases(45.8%), varicose in 11 cases(22.9%), saccular in 9 cases(18.8%) and mixed type in 6 cases(12.5%).

An Economic Effect Analysis of ASEAN FTA on FDI Flows into the ASEAN Countries

유정근 한국유통과학회 2016 유통과학연구 Vol.14 No.1

Purpose – Considering industrialization development stages, an economic effect of ASEAN free trade agreement (FTA) on foreign direct investment (FDI) flows into the ASEAN countries was analyzed. Research design, data, and methodology – utilizing macro-level panel data from 2001 to 2012, panel regression analysis was conducted with a model constructed based on the knowledge- capital model. Results – As for overall ASEAN countries, ASEAN FTA was positively effective to attract vertical FDI to this region, while horizontal FDI was dominant before ASEAN FTA. Meanwhile, for the diversified economy relevant to Singapore, ASEAN FTA was not effective to attract FDI. For the ongoing industrialization economy relevant to Thailand, Malaysia, and the Philippines, ASEAN FTA was negatively effective to attract FDI; ASEAN FTA became a strong incentive to replace foreign investments with trade transactions for the horizontal firms, but an influence of market potentials after ASEAN FTA, which induces to third-country effects such as export platform FDI, has increased. For the incipient industrialization economy relevant to Indonesia, Vietnam, and Cambodia, ASEAN FTA was positively effective to attract vertical FDI. Conclusions – The effectiveness of FTA on FDI inflows varied considerably by the industrialization development stages of host countries.

Silica Aerogel과 펄프 복합체의 기계적 특성에 관한 연구

유정근,김학희,김학수,최창하 한국화학공학회 2014 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.52 No.3

본 연구는 실리카 에어로겔-펄프 복합체의 특성을 조사하였다. Paste 형태의 실리카 에어로겔과 펄프를 혼합하여 복합체를 제조하였으며, SEM 분석을 실시하였다. 또한 임피던스 튜브를 사용하여 흡음률을 측정하였다. 흡음계수의 피크치는 900 Hz 범위에서 얻어졌다. 실리카 에어로겔-펄프 혼합체는 우수한 흡음성능과 복합체의 표면이 소수성을 띠기 때문에 기인하는 내구성 때문에 새로운 흡음제의 가능성이 있다고 사료된다. The studies on the characteristics of composite of silica aerogel and pulps were carried out. The compositewas manufactured by mixing the paste of silica aerogel and pulps and analyzed by SEM. Using the impedence tube, thesound absorption measurement was investigated. The maximum value of sound absorption coefficient of this compositewas obtained in the range of 900 Hz. It was found that the composite of silica aerogel and pulps could be a new soundabsorbent because of high absorption capacity and durability which was due to hydrophobic effect on the surface of thecomposite.

서울시 중구형 뉴딜정책 관련 지역경제 발전전략 연구

유정근 한국정책학회 2021 한국정책학회 추계학술발표논문집 Vol.2021 No.-

Fabrication of Silicon Nanotubes based on Surface Sol - gel Reaction and Their Application to Energy Storage

유정근,정연식 한국고분자학회 2012 한국고분자학회 학술대회 연구논문 초록집 Vol.2012 No.4

품질기능 전개 방식에 의한 TQM 구축 연구

유정근,최성 한국산학기술학회 2003 한국산학기술학회 학술대회 Vol.- No.-

점점 취약해지고 있는 우리 나라의 산업 경쟁력은 WTO 체제의 새로운 무역 질서와 치열해진 품질 및 생산성 경쟁으로 더욱 심한 어려움에 직면하고 있다. 품질 우위를 통한 산업 경쟁력 향상 노력은 기업마다 가지고 있는 공통적인 경영 과제가 되고 있지만 정부와 관련 단체 등의 의욕적인 품질경영(QM:Quality Management)시책과 노력에도 불구하고 이를 통한 가시적 경영 성과는 극히 일부 기업에서만 확인되고 있는 실정이다. 본 연구에서는 이와 같은 TQM 적용상의 이론적 과제 해결에 보다 접근하기 위하여 품질기능 전개(QFD:Quality Function Deployment) 방식을 조직에 적용하는 방법을 제시하였다. 즉 조직에 대한 품질기능 전개가 TQM체제 구축을 위해서 유용한 수단이 될 수 있음을 보이고, 어떠한 단계로 전개하는가를 단계별로 제시하였다. TQM 도입 단계에서 전 조직 부문과 계층을 품질기능이라는 요소로 시스템화 하고 이 시스템을 통하여 전 부문이 조직적으로 참여할 수 있는 방안을 연구하였다.

Facile synthesis of silicon nanotubes toward a high-performance anodematerial for lithium ion batteries

유정근,김종순,강기석,정연식 한국고분자학회 2012 한국고분자학회 학술대회 연구논문 초록집 Vol.2012 No.10

고로수재슬래그로부터 고순도 질산칼슘 회수에 관한 연구

유정근,이만승,김경수,최승훈,Yoo Jeong Kun,Lee Man Seung,Kim Kyung Soo,Choi Seung Hoon 한국자원리싸이클링학회 2004 資源 리싸이클링 Vol.13 No.2

제철산업에서 발생되는 고로수재슬래그로부터 고순도 질산칼슘을 회수할 수 있는 독창적인 자원화 공정을 위한 개념과 실험결과를 수록하였다. 먼저 고로수재슬래그를 질산과 반응시킨 후, 불용성의 실리카를 분리하였고, 생석회를 첨가하여 여액의 pH를 6∼8범위로 조절하여 Fe, Al, Mg등의 불순물을 침전, 여과 분리시켰으며, 고농도의 질산칼슘여액을 결정화시킴으로써 비료 등으로 활용될 수 있는 순도가 98% 이상인 고부가 가치성 질산칼슘 4수화물 결정을 회수하였다. Concepts and experimental results for the unique utilization process which we could obtain the high purity calcium nitrate from blast furnace slag in the steel industry are described. Firstly we reacted the blast slag with nitric acid and separatively removed the insoluble silica by filtration. We adjust the pH of filtrate to 6∼8 with calcined lime, and then precipiated out the metal components like Fe, Al, Mg in the forms of hydroxides. Consequently concentration of the mother liquor and crystallization processes make us obtain the high purity (>98 wt%) calcium nitrate tetrahydrates, which is expected the valuable fertilizers.

실적이익(實績利益)의 변화방향(變化方向)에 따른 재무분석가(財務分析家)의 이익예측오차(利益豫測誤差) 분석(分析)

유정근,柳奭圭 한국경영교육학회 1996 경영교육연구 Vol.11 No.-

Glyoxalated Polyacrylamide as a Covalently Attachable and Rapidly Cross-linkable Binder for Si Electrode in Lithium Ion Batteries

유정근,전재범,강기석,정연식 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.2

Recently, investigation of Si-based anode materials forrechargeable battery applications garnered much interest dueto its exceptionally high capacity. High-capacity Si anode(~4,200 mAhg−1) is highly desirable for the replacement ofconventional graphite anode (< 400 mAhg−1) for large-scaleenergy-storage applications such as in electric vehicles (EVs)and energy storage systems (ESSs) for renewable energysources. However, Si-based anodes suffer from poor cyclingstability due to their large volumetric changes during repeatedLi insertion. Therefore, development of highly efficient bindermaterials that can suppress the volume change of Si is one ofthe most essential parts of improving the performance of batteries. We herein demonstrate highly cross-linked polymeric binder(glyoxalated polyacrylamide) with an enhanced mechanical property by applying wet-strengthening chemistry used in paperindustry. We found that the degree of cross-linking can be systematically adjusted by controlling the acidity of the slurry and hasa profound effect on the cell performance using Si anode. The enhanced cycle performance of Si nanoparticles obtained bytreating the binder at pH 4 can be explained by its strong interaction between the binder and Si surface and current collector, andalso rigidity of binder by cross-linking.