Preparation of mechanically enhanced supramolecular carbon nanotube (CNT) film using a water‑soluble π–π bonding linker

Jun‑Woo Lee,Moonseong Yoo,Kun Won Kim,Hyein Jeong,Jae Woo Chung 한국탄소학회 2019 Carbon Letters Vol.29 No.5

Mechanically enhanced supramolecular carbon nanotube (CNT) films were prepared in water by employing the π-electronrich phenyl, naphthalenyl, and pyrenyl end-functionalized polyethylene oxides (PEOs) as supramolecular linkers, followed by vacuum filtration. Among them, the supramolecular CNT film produced by the pyrenyl end-functionalized PEO (PEOPy) exhibited the highest mechanical strength, which was ~ 1.5–2 times higher than that of the CNT films produced using the typical dispersant, Triton X-100, although the functionality of PEO-Py was lower than that prepared using other linkers, and the content of PEO-Py in the CNT films was lower than that obtained using Triton X-100. Fluorescence and UV–Vis spectroscopy demonstrated that the improved mechanical properties of the supramolecular CNT film result from the formation of π–π interactions between the CNT and the pyrene moieties of the PEO-Py linker. Finally, the supramolecular CNT film exhibited a 40–50 dB electromagnetic shielding efficiency through hybridization with silver nanowires.

동북아 피더네트워크의 Win-win전략에 관한 연구

장우준(Woo-jun jang),전찬용(Chan-Yong jeon),김태원(Tae-Won Kim),곽규석(Kyu-Seok Kwak),남기찬(Ki-Chan Nam) 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.3 No.1

최근 중국은 양산항을 개장하여 선사 유치를 위한 다양한 혜택을 제공하고, 일본은 "수퍼중추항만 육성계획“을 세워 항만의 효율성을 바탕으로 비용을 낮추려는 노력을 하고 있다. 또한 선박의 대형화에 의한 중심항만(Hub Port) 위주의 기항과 북중국의 대량 물량 발생지역에 대한 직기항 경향으로 동북아 항만간의 경쟁이 더욱더 치열해 지고 있으며 동북아 역내 피더네트워크 강화의 필요성이 제기되고 있다. 따라서, 본 연구에서는 유럽 피더네트워크 전략 사례를 바탕으로 동북아 피더시장 현황을 파악하고 동북아 피더네트워크 구조를 분석함으로써 동북아 역내 항만 및 선사간의 과당경쟁을 지양하고 서로 Win-Win할 수 있는 터미널의 전략적 활용, 선사간 제휴 확대, 항만간 협력 강화를 위한 구체적인 전략을 제시하였다. Recently, China opened Yangshan port and provides a variety of benefits for shipping companies. Japan plans to reduce logistics costs and improve efficiency through the established "super major ports" project. According to the "hub and spokes" system, the number of direct calls toward North-Chinese ports are increasing. This changing environment has negative effects on the amount of transshipment cargos in Korean ports. In order to make a hub port of a domestic port, it is necessary to develop northeast Asian feeder networks. Therefore, this paper analyzes the structure of northeast Asian feeder networks through the case study of European feeder networks strategy. Finally, we suggests the plans to reinforce feeder networks, which are strategic terminal operation, strategic alliances between shipping companies and port co-operation, for win-win strategy in the competitive northeast Asian market.

야뇨증 환아들의 심리사회적 특성에 대한 다기관 연구 : 행동 및 정서 문제를 중심으로

조수철,김재원,신민섭,황준원,한상원,박관현,이상돈,김경도,김건석,서홍진,이유식,정재용,김영균,문두건,남궁미경,한창희,조원열,김영식,배기수,이종국,정우영,신의진 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.6

Objectives : The aim of this study was to examine the behavioral and emotional problems associated with nocturnal enuresis in Korean children. Methods : Three hundred eighteen children with nocturnal enuresis, together with their parents, completed the Child Behavior Checklist (CBCL), Disruptive Behavior Disorder Scale according to DSM-IV (DBDS), Children's Depression Inventory (CDI), State-Trait Anxiety Inventory for Children (STAIC), and Piers-Harris Children's Self-Concept Scale (PHCSC). Ninety-three normal students were selected as the control group. Results : Compared to the normal control group, the mean scores with regard to the withdrawn, social problems, attention problems, delinquent behavior, aggressive behavior, externalizing problems and total problems profiles were significantly higher in the nocturnal enuresis group according to the CBCL results. The nocturnal enuresis group also scored significantly higher in the ADHD and ODD profiles of the DBDS. The nocturnal enuresis group was more depressed and anxious than the control group according to the results of the CDI and STAI. The mean score of the PHCSC was significantly lower in the nocturnal enuresis group when compared to the normal control group. Conclusion : The results of this study suggest that children with nocturnal enuresis in Korea have clinically relevant behavioral and emotional problems. The findings support the link between nocturnal enuresis and psychopathology in Korean children.

실시간 응용프로그램을 위한 최악 실행 시간 분석

元裕憲,徐鎭哲,李俊東 弘益大學校 科學技術硏究所 1999 科學技術硏究論文集 Vol.10 No.1

Worst-case execution time(WCET) is part of the timing analysis of real-time systems. The goal of timing analysis is to validate that a real-time computer system fulfills the specified temporal requirements of a given application in all predicated situation. In this paper, We illustrate a new language, Timing-C, and design a timing tool for predicting WCET in it. Timing-C is added time constraint and a few restriction in the subset of C. Using Timing-C, programmer need not learn a new language and can demonstrate program's timing activity.

기저질환이 없는 사람에서 발생한 Campylobacter fetus에 의한 재발성 심내막염 1예

전재범,정진원,김성혜,송문희,오형철,안성기,최상호,김남중,김양수,우준희,류지소 대한감염학회 2004 감염과 화학요법 Vol.36 No.6

C. fetus 심내막염은 드물게 발생하는 질환으로 주로 면역능이 저하된 환자에서 발병하고 대동맥판을 침범하는 경우가 많으며 적절한 치료가 되지 않을 경우 치사율이 높다. 저자들은 기저질환이 없던 69세 남자에서 C. fetus 심내막염을 경험하였기에 문헌고찰과 함께 보고하는 바이다. 환자는 발열로 내원하여 시행한 혈액배양 검사상 C. fetus가 동정되었고 경식도 초음파 검사상 삼첨판에 증식증이 발견되어 심내막염 진단하에 ceftriaxone에 이어 meropenem으로 총 4주간 항생제를 투여받고 호전되었다가 한달 후 다시 재발하였고 판막부전 소견 진행하여 삼첨판 치환술을 시행받고 전신상태 호전되어 퇴원하였다. Campylobacter fetus is a rare cause of endocarditis. To date, only about 30 cases of C. fetus endocarditis have been reported mainly in the elderly with chronic underlying illnesses. Most cases showed tendency to involve aortic valve. This report describes a case of native tricuspid valve infective endocarditis in a 69-year-old man without any underlying disease. Despite adequate antibiotic therapy for 4-weeks, endocarditis recurred and leading to surgical valve replacement.

개에서 발생한 이혈종의 임상적 관리

이우철,윤기영,서경원,최호정,정성목,송근호,조종기,박성준 忠南大學校 獸醫科大學 附設 動物醫科學硏究所 2012 動物醫科學硏究誌 Vol.19 No.1

A 14-year-old male pomeranian was present with swollen left ear. The swelling occurred from base to apex of pinna. Otitis externa persisted for two years. Hematological and serum biochemistry values were not remarkable. The surgery treatment was the most appropriate method among indwelling drain, surgical, and steroid treatment in the aural hematoma because the dog was very sensitive to touching pinna and the size of aural hematoma. Longitudinal incision was applied after general anesthesia. Cefovecin was injected to prevent secondary infection. The outcome of surgery was good. There was no evidence of recurrence for one year.

행정윤리로서의 사회적 형평성에 관한 이론적 고찰 : 복지정책과 이념정립 모색 A Search for Establishing the Ideology of Welfare Policy

전형원,함우식 군산대학교 지역개발연구소 1991 地域開發硏究 Vol.3 No.-

Double Probe 측정법에 의한 RFI 플라즈마 특성에 관한 연구

전용주,박원주 영남대학교 공업기술연구소 1999 工業技術硏究所論文集 Vol.27 No.1

Electron temperature and electron density were measured in RFICP(Radio-Frequency Inductively Coupled Plasma) by using double probe method. Measurements were conducted in argon discharge for pressures from 30mTorr to 60mTorr and input RF powers from 50W to 200W and gas flowrates from 3sccm to 12sccm. Radial distributions of electron temperature and electron density were measured for discharges for the same aspect ratio (R/L=1). Electron temperature was found to depend on pressures and gas flowrates, but just weakly on powers. Electron temperature was almost constant while input RF power was increased, and decreased with increasing pressures, and that electron temperature had a tendency to get lower at low gas flowrates when argon gas flowrate was increased, but it is considered that there is just slight changes in tendency, if any, with increasing gas flowrates. Electron density depended on all of pressures, input RF powers and gas flowrates. Electron density increased with increasing input RF powers, and was kept constant for the gas flowrates, and that it increased with increasing gas flowrates. Radial distribution of the electron temperature was seen to gradually increase from plasma center toward plasma environs. Radial distribution of the electron density was peaked at the plasma center. These results make it easier for us to understand the generation and stay-on mechanism of RFICP.

조기 발병 양극성 장애 환자의 임상적 특징 : 후향적 의무기록 조사 연구

우영섭,박민현,서호준,채정호,전태연,박원명 大韓神經精神醫學會 2007 신경정신의학 Vol.46 No.5

Objective : Bipolar disorder is a disease with diverse clinical profiles and outcomes. In recent years, it is suggested that if bipolar disorder occurs early in one's life, functional and symptomatic prognoses are poor. The prognoses include severe Symp-toms, frequent psychotic symptoms, comorbidity ofmental illnesses, slow improvement of the symptoms, and high suicide rate. We investigated the clinical characteristics of early onset bipolar inpatients. Method : The subjects of this study were selected from the patients who were discharged after hospitalization between January 1, 2001 and May 31, 2005 and diagnosed with bipolar disorder according to DSM-IV criteria. These patients were examined for the following data ; the type of bipolar disorder, comorbid psychiatric disorders, the age at onset of the illness, the acuteness of the disorder, and the duration of the disorder. The presence of four major clinical psychopathology, rapid cycling, Psychotic symptoms, comorbid psychiatric disorders, and suicide attempt, was also examined. The patients whose onset of the illness was before the age of 19 were classified as the early onset group and after the age of 19 were classified as the late onset group. Data on demographics, family histories, four major clinical psychopathologies and other clinical variables were compared between the early onset group and the late onset group. Results : Of the 53 patients, 19 patients belonged to the early onset group. There was higher incidence ofpsychotic Symp-toms in the early onset group than in the late onset group, and the difference was statistically significant according to the χ² - test (84.2% vs 44.1%, P=0.005). The incidence of comorbid psychiatric disorders was higher in the early onset group than in the late onset group, and the difference was also statistically significant according to the χ²-test (52.6% vs 23.5%, P=0.032).However, there was no statistically significant difFerence between the groups regarding the incidence of rapid cycling and suicide attempt. The result of logistics regression showed correlation of psychotic symptoms (0R=6.756 ; 1.655≤95% CI≤27.580) and comorbid psychiatric disorders (0R=3.611 ; 1.088≤95% CI≤11.984) with the early onset group. Conclusion : Early onset of bipolar disorder is related to the manifestation of psychotic symptoms and frequently accom-panies comorbid psychiatric disorders. The results of this study will help understand the mechanism of the onset of complexbipolar disorder and estimate the prognosis.

Neisseria elongata subsp. nitroreducens 에 의한 감염성 심내막염 1 예

원선영,정두련,주광로,이미숙,조용균,김은옥,김양수,우준희,배직현,류지소 대한화학요법학회 1998 대한화학요법학회지 Vol.16 No.2

Neisseria elongata subsp. nitroreducens는 Neisseria elongata의 세 가지 아종 중에서 인체에 병원균으로 작용하는 세균으로서 주로 심내막염을 일으키며 드물기는 하지만 그 증례 수가 점차 증 가하고 있으며 국내에서는 아직 보고된 바가 없었다. 저자들은 이전에 심질환의 병력이 없던 36세의 남자에서 치과치료 후 발생한 N. elongata subsp. nitroreducens에 의한 심내막염을 경험하여 문헌고찰과 함께 보고하는 바이다. N. elongata subsp. nitroreducens에 의한 심내막염은 경과 중 판막 파괴를 많이 초래하여 판막치환술이 필요했던 경우가 많았던 것의로 보고되고 있으나 본 증례에서는 4주간의 항균제 치료만으로 합병증 없이 호전되었다. Neisseria elongata subsp. nitroreducens differs from the other subspecies of N. elongata in additional reduction of nitrate without gas formation. Like most Neisseria, species except Neisseria meningitidis and Neisseria gonorrheae, N. elongata subsp. nitroreducens is usually classified in the group of non-pathogenin Nisseria. However, N. elongata subsp. nitroreducens, usual commensal of nasopharynx, can cause serious infections, usually endocarditis. To date, infective endocarditis with N. elongata subsp. nitroreducens has not been reported in Korea. We report a case of 36 year-old Korean male with Neisseria elongata subsp. nitroreducens endocarditis who was treated with antimicrobial agents without complication.