다양한 산화물들이 리튬규산염 유리의 결정화에 미치는 영향

김철민,임형봉,김용수,김세훈,오경식,김철영,Kim, Chul-Min,Lim, Hyung-Bong,Kim, Youg-Su,Kim, Se-Hoon,Oh, Kyung-Sik,Kim, Cheol-Young 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.4

Glass-ceramics based on lithium disilicate($Li_2Si_2O_5$) are prepared by heat-treatment of glasses in a system of $SiO_2-Li_2O-K_2O-Al_2O_3$ with different compositions. The crystallization heat-treatment was conducted at the temperature range of $700{\sim}900^{\circ}C$ and samples were analyzed by XRD and SEM. Mechanical properties were determined by a Vicker's hardness and 4 point bending strength. When $SiO_2/Li_2O$ ratio increased, cristobalite and tridymite crystals showed more predominate than lithium disilicate crystals. Increase in $Al_2O_3$ contents in the glass suppressed crystallzation of lithium disilicate crystals. Increase in ZnO, $B_2O_3$ contents in the glass decreased crystallization temperature of lithium disilicate crystals, and increased mechanical properties because of the reduction of the lithium disilicate crystal size.

화물자동차 운송정보망 구축에 관한 탐색적 연구

김철민Chul-Min Kim) 한국국제상학회 2010 國際商學 Vol.25 No.2

Domestic cargo trucking transportation service industry has been suffering from too much excessive supply and one of the reasons was the unadequate government policy. 'This hard environment causes truck drivers' transportation veto from 2003 and serious danmge to the Korean economy. Recently, the proposition of a cargo trucking service transportation law which is submitted to the Korea national assembly in 2009 can be an effective alternative for the innovation of the old and inefficient cargo trucking transportation industry. According to the above law proposition, trucking company and trucking mediation agencies should use the cargo trucking information networking system which can be cargo trucking franchise companies or information systems certified by the Korean government. This research compared the needs for the trucking information networking system among truck drivers, trucking and service mediating agencies, and forwarders by the survey methodology. Research results suggest tllat the information networking system should be developed by the regional base, not the whole country base. Survey research also suggests tllat the various trucking transportation associations in Busan should participate in the developing and operating of the new system

원인 불명의 실신 환자의 진단에 있어서 Head - up tilt Test 의 유용성과 혈관미주신경성 실신 환자의 임상적 특징

윤호중(Ho Joong Youn),정욱성(Wook Sung Chung),백상홍(Sang Hong Baek),김철민(Chul Min Kim),박인수(In Soo Park),김재형(Jae Hyung Kim),최규보(Kyu Bo Choi),홍순조(Soon Jo Hong) 대한내과학회 1994 대한내과학회지 Vol.47 No.2

N/A Background: Syncope, defined as a transient loss of consciousness, is a frequently encountered symptom, but despite thorough clinical and invasive diagnostic investigation, the cause of syncope remains unexplained. In recent years, head-up tilt test has been of increasing interest as a diagnostic aids in patients with unexplained syncope. We studied to define the usefulness of various diagnostic test in the evaluation of patients with recurrent syncope, to assess the usefulness of head-up tilt test in the working of syncope of unknown origin and to evaluate the clinical characteristics of subgroups of patients with syncope induced by head-up tilt test. Methods: Between June, 1991 and November, 1992 at St. Mary`s hospital, 21 patients with history of syncope and 24 control subjects without history of syncope underwent 60° head-up tild test for 60 min. Results: 1) The definite cause for recurrent syncope were diagnosed in 10 of patients (47,6%) after clinical and invasive tests. 2) During head-up tilt test, vasovagal responses were provoked in 5 of 21 patients (23.8%) with recurrent syncope and 1 of 24 patients (4.2%) without syncope (p<0,05). 3) The head-up tilt test induced symptomatic bradycardia or hypotension in 3 of 10 patients (30%.) with negative electrophysiologic results. 4) During tilt induced vasovagal response, a) mean heart rate decreased to 42±24 beat/min from supine control of 70±12 beat/min (p<0. 05), b) mean systolic blood pressure decreased to 95±12 mmHg from supine control of 120±S mmHg (p<0,05), c) mean diastolic blood pressure decreased to 60±21mmHg from supine control of 72±13 mmHg (p<0.05), d) the time interval to onset of vasovagal response was 22±12 min. Conclusions: 1) In a large proportion of patients with recurrent syncope, the diagnosis remains unexplained despite a neurologic and cardiologic investigation including an electrophysiologic study. 2) Vasovagal responses are frequent cause in patients with recurrent unexplained syncope. 3) The head-up tilt test may be a simple, safe and highly yielding provocative test in the investigation of syncope of unknown origin.

시뮬레이션을 통한 압전형 초음파 스케일러 개발 및 평가

김철민,이영진,백종후,정영훈,강국진,이정배,이승대,Kim, Chul-Min,Lee, Young-Jin,Paik, Jong-Hoo,Jeong, Young-Hun,Kang, Kook-Jin,Lee, Jeong-Bae,Lee, Seung-Dae 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.10

A piezoelectric ultrasonic scaler, usually used to remove the tartar out of teeth and to amputate the pubis, is a recently popular instrument for dental treatment due to its several merits such as small size, low-electric power, precision and low-cost. It has typically two parts of a tip and vibration system, which is also composed of head, piezoelectric elements and tail-mass. The scaler concentrates its displacement on tip and has commonly a resonance frequency at 25~30 kHz, and in order to improve the performance of the scaler, it is important to standardize the size of the vibration system without tip for high performance because scaler in quality differs according to several tips. In this study, a Finite Element Analysis (FEA) was utilized to optimize the structure of ultrasonic scaler in the vibration system. Consequently, this study revealed that influence of several tips on property were minimized and scaler showed good property at the resonance frequency of 28 kHz.

MPEG-2 비디오 디코더 적합성 검사용 비트열의 제작

김철민,이병욱,박래홍,Kim, Chul-Min,Lee, Byung-Uk,Park, Rae-Hong 대한전자공학회 1999 電子工學會論文誌, S Vol.s36 No.10

MPEG-2 비디오 표준에서는 다양성을 보장하기 위하여 많은 변수들을 조절할 수 있다. MPEG-2 비트열을 통하여 전송되는 이러한 변수들이 MPEG 비디오 디코더에서 올바르게 해석되어, 전송한 것과 동일한 영상이 수신기에서 재생되는지 확인하여야 한다. 본 논문에서는 검사할 디코더의 최정화면을 관측하여 MPEG 비디오 디코더의 정상 동작 여부를 간편하게 확인할 수 있도록 검사용 비트열을 설계하는 방식을 제안하였다. 제작된 비트열의 내부는 두 부분으로 구성된다. 하나는 검사할 변수를 변화시키며 검사 패턴을 만드는 부분이고, 다른 하나는 MPEG의 움직임 보상과 discrete cosine transform(DCT) 계수를 이용하여 이전 프레임에서 만들어진 검사 패턴을 상쇄시키는 부분이다. 이러한 원리를 적용하여 검사용 비트열을 제작하였고 스프트웨어 디코더로 분석한 결과를 제시하였다. In MPEG-2 video standard, there are many parameters to support profiles and levels. It is necessary to verify that a decoder is compliant with the MPEG-2 standard. This paper proposes a design principle of the test bitstreams which confirms that an MPEG video decoder is correct by observing the final image of the decoder under test. The presented test bitstream is composed of two parts. The first part generates a test pattern by varying a selected test parameter. And the following predictive coded picture generates a complementary pattern to the previous image by motion compensation and DCT coefficients. Then it will result in a uniform pattern. We present several bitstreams following the proposed principle. Also we analyze and compare the characteristics of the test bitstreams presented in the MPEG conformance test and the proposed test bistreams.

제2차 세계대전과 유고슬라비아

김철민,Kim, Chul Min 한국외국어대학교 외국학종합연구센터 동유럽·발칸연구소 2000 동유럽발칸연구 Vol.8 No.-

위험정보 사회적 확산의 빅데이터 분석

김철민(Chul-Min Kim),최충익(Choong-Ik Choi) 한국지역개발학회 2017 한국지역개발학회 세미나 논문집 Vol.2017 No.1

This article aims to explore amplification of risk information in Gyeongju earthquake. There have few researches on diffusion of risk information using Big Data, even though there have been many articles tackling social amplification of risk. the results show that the main keyword of risk amplification is aftershock and the main topic is damages and government response . It can be said that the increase of risk and social anxiety is mostly due to mistaken government responses. It also presents that a new way to approach an social risk amplification research

결핵균 PCR에서 이온교환수지를 이용한 신속한 DNA 분리

김철민 ( Cheol Min Kim ),박승규 ( Seung Kyu Park ),손말현 ( Mal Hyun Shon ),송선대 ( Sun Dae Song ),김영 ( Young Kim ),전은숙 ( Eun Sook Jun ),손한철 ( Chul Son Han ),정병선 ( Byung Sun Jung ) 대한결핵 및 호흡기학회 1996 Tuberculosis and Respiratory Diseases Vol.43 No.1

19세기 민족주의 시대와 크로아티아

김철민(Kim, Chul-Min) 한국외국어대학교 동유럽발칸연구소 2003 동유럽발칸연구 Vol.11 No.2

이 논문에서는 19세기 민족주의 시대에 크로아티아에서 일어났던 민족주의의 형태들중 특히 20세기 남슬라브족 통합국가에 기초가 되었던 일리리아주의(Ilirizam)와 유고슬라비아 주의(Jugoslavizam)에 대해 통시적인 방법을 통해 연구하였다. 18세기 미국 독립 전쟁과 프랑스 혁명을 계기로 일어난 민족주의는 19세기에 들어와서 는 나폴레옹 유럽 원정을 통해 크로아티아를 비롯한 전 유럽으로 확산되게 된다. 민족주 의가 도래할 당시 크로아티아는 합스부르그를 비롯한 외세 지배하에서 지역적, 민족적 그 리고 문화적으로 서로 분열된 상태에 처해있었다. 이러한 현실속에서 민족주의의 영향을 받았던 크로아티아의 지식인들은 크로아티아의 정치적 통합과 민족간 단결을 유도하기 위 해 가장 광범위하게 펼쳐져 있던 쉬토(Štokavski)방언을 중심으로 언어적 통합운동을 우 선 전개하게 된다. 이 운동은 이후 외세 지배를 벗어나 자신들의 민족-국가(Nation-State) 를 수립하기 위한 ‘일리리아주의’로 발전하게 되었다. 이후 1848년에 일어난 2월 파리 혁 명과 여러 역사적 중요 사건들을 거치면서 일리리아주의는 점차 남슬라브족 통합운동인 ‘유고슬라비주의’로 발전하게 된다. 이러한 연구배경을 기초로 이 논문에서는 19세기 민족주의 시대에 크로아티아에서 일 어났던 일리리아주의와 이를 모태로 발전한 유고슬라비아주의가 어떠한 역사적 배경과 과 정을 거치며 발전하게 되었는지, 그리고 이러한 민족주의의 양태들이 남슬라브족들에게 가져다 준 의미는 무엇이었는지에 대한 이해를 역사적 시각을 통해 제시하고자 했다. Nationalism, which began to spread to the Central and the Balkan Europe from the Western Europe after the 19C, is changed differently from the West according to the situation and the circumstances of the nations in this area. If say Nationalism of the West such as "Political nationalism", we can say Nationalism in the Central and the Balkan Europe such as "Cultural Nationalism". With this view point, in this paper, I analyze about the process and the meaning of Ilirism and Yugoslavism of the 19C' Croatia which has a effect in a establishment of the First unity nation of South Slaves ("the Kingdom of Serbians, Slovenes and Croatians") and of the Tito's Socialist Yugoslav Federation in the 20C. In the chapter II, I analyze the movement of the language reform and Ilirism of Croatia in the 19C for which is useful in understanding the development of Yugoslavism. In the chapter III is devoted to searching the meaning of the historical events after the second half of the 19C in Croatia, and I, at the same time, study the making process of Yugoslavism and that's influences. Finally, in the chapter VI, I summarize how effect Nationalism in Croatia, and what Ilrism and Yugoslavism meant to Yugoslavia and South Slaves in the 20C.

세르비아 시각과 국제사적 관점으로 본 제1차 세계대전 근원 연구

김철민(Chul-Min Kim) 한국외국어대학교 동유럽발칸연구소 2018 동유럽발칸연구 Vol.42 No.3

1918년 11월, 제1차 세계대전은 종결 100주년을 맞이한다. 오랜 동안 세르비아는 제1차 세계대전을 일으킨 주요 동인이자 진원지로 국제 사회에 낙인 되어 왔다. 하지만 최근 들어 당시 제1차 세계대전 발발 근원에 대한 여러 논쟁이 가열되고 있다. 제 1차 세계 대전의 발발 동기에 대해선 이를 연구하는 학자들 대다수가 동의하고 있지만 그 책임론과 근본적 원인에 대 해서만큼은 여전히 논란의 여지가 남아 있다. 주요 논쟁중 하나는 보스니아사라예보에서 세르비아 청년에 의한 총격 사건이 일어날 수밖에 없었던 당시 시대적 상황과 국제역학구도의 불안정성에 초점이 맞추어지고 있다. 국 제사적 관점에서 세르비아 역사가들은 제1차 세계대전의 근원이 19세기 오스트리아의 전략적 ‘동진 정책’과 보스니아 지배 전략에 기인하고 있음을 주목하고 있다. 특히 1908년 오스트리아의 보스니아 합병은 당시 발칸 반도를 둘러싸고 급변하던 국제 역학 구도와 맞물려 보스니아에서 세르비아와 오스트리아 간 충돌로 이어졌으며 이것이 제1차 세계대전을 촉발하게 되었 음을 강조하고 있다. 본 연구에서는 세르비아의 시각과 국제사적 관점을 바탕으로 제1차 세계대전의 근원에 대한 재검증을 시도하고 내용을 분석하고자 한다. In November 1918, the First World War celebrates its 100th anniversary. For a long time, Serbia has been stigmatized by the international community as a major epicenter of the First World War. There are, however, many controversies over the origins of the outbreak of the First World War. The motivation for the outbreak of the First World War is agreed by many scholars who study it, but there remains some controversy over its responsibilities and origins. One of the major controversies is about the instability of the situation and international mechanism which was inevitable ‘the Sarajevo shootout’ by Serbian in Bosnia. Serbian historians note that the origins of the First World War originated in the 19th century Austrian strategic ‘Eastward Policy’ and governance strategies for Bosnia. In particular, Serbian emphasized the Austria’s annexation of Bosnia in 1908 with the rapidly changing international mechanism surrounding the Balkans led to the clash between Serbia and Austria in Bosnia, and that this has sparked the First World War. In this study, I try to re-verify the origin of the First World War and analyze its content based on the perspective Serbia and International history.