층간소음저감재 장기 내구성 평가를 위한 가열시험의 문제점 및 개선방안에 관한 연구

박연준(Youn-Joon Park),이찬규(Chan-Gyu Lee) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.4

This study compared Kd, loss factor and thickness of floor impact isolator by loading /unloading heat treatment with results by continuous loading treatment and checked problem and improvement method of heat treatment condition for the long-term stability evaluation of the floor impact isolation. As the results, it is required the change of heat treatment condition unloading now to loading as actual weigh on the floor impact isolator.

연속인가하중에 의한 층간소음저감재 물성변화에 관한 연구

박연준(Youn Joon Park),이찬규(Chan Gyu Lee) 한국소음진동공학회 2010 한국소음진동공학회 학술대회논문집 Vol.2010 No.10

전기적으로 빠른 과도현상/버스트 신호의 복사방출과 대책

박수훈(Soo Hoon Park),김동일(Dong Il Kim),박연준(Youn Joon Park),나승욱(Seung Wook Nah) 한국전자파학회 2016 한국전자파학회논문지 Vol.27 No.3

본 논문에서는 전자파적합성 국제 규격인 IEC 61000-4-4에서 규정하고 있는 전기적으로 빠른 과도현상/버스트(EFT/Burst) 신호가 전원선을 따라 시험대상품에 인가될 때, 인가신호에 기인하여 방사되는 불요전자파와 그 신호가 피시험품에 미치는 영향에 대해 연구하였다. 먼저 국제규격에 규정된 시험 배치방법에 따라 시험 샘플을 설치하고, 검증된 EFT/Burst 발생기로 1분 동안 +4 ㎸의 규정된 신호를 길이 1 m인 전원선을 통해 시험 샘플에 인가하였다. 그 결과, 전원선을 통해 인가되는 전도성 EFT/Burst 내성 신호 외 버스트 발생기 및 전원선에서 직접 공기 중으로 방출되는 방사성 신호(EFT/Burst 노이즈)가 검출되었고, 국제 공인시험 규격으로 이 신호를 측정한 결과, 규제 레벨보다 30 ㏈ 이상 높았다. 또한, EFT/Burst 방사성 신호의 최대 방사 지점과 시험품의 이격 거리에 따른 전계강도를 측정한 결과, 방사내성 국제규격치보다 최대 23 V/m 이상 강한 전계강도가 검출되었다. 이는 EFT/Burst 방사성 노이즈가 직접적으로 제품에 인가되어 오동작을 유발할 가능성이 대단히 높으므로 대책이 요구됨을 확인하였다. In this paper, we studied about the radiated emission of EFT(Electrical Fast Transient)/Burst signal, referenced IEC-61000-4-4 of the international EMC standard and its effect on EUT(Equipment Under the Test) when EFT/Burst signal (Conducted noise) induced on a power cable to EUT. Firstly, we set up test sample by the standard and +4 ㎸ standard signal is induced by EFT/Burst signal generator with 1 m length power cable for 1 minute. Consequently, we found not only induced EFT/Burst signal along power line, but also directly radiated emission signal from EFT/Burst signal generator (Radiated emission noise of EFT/Burst). The radiated emission signal of EFT/Burst was 30 ㏈ which is higher than limit of CISPR 22 which is international EMC standard. Moreover, we measured the electric field strength by changing distance from maximum radiated emission point to electric field strength tester. As a result, this electric field strength was 23 V/m which is higher than international EMC standard test level(CISPR 24). Therefore, it was confirmed that the probability of malfunction may be high when radiated emission of EFT/Burst noise exists near the EUT.

Epstein-Barr Virus in Nasal Angiocentric Lymphoma with Malignant Histiocytosis-like Hemophagocytic Syndrome

한지연(Ji Youn Han),김훈교(Hoon Kyo Kim),문한림(Han lim Moon),서은주(Eun Joo Seo),권희정(Hi Jeong Kwon),박연준(Yeon Joon Park),민기옥(Ki Ouk Min),윤세철(Sei Cheol Yoon),김민식(Min Shik Kim),조승호(Seong Ho Cho),김병기(Byung Kee Kim) 대한두경부종양학회 1997 대한두경부 종양학회지 Vol.13 No.1

서론 : 혈구탐식증후근은 고열, 범혈구감소증, 간비장종대, 림프절비대 및 혈액응고장애 등을 동반하는 전신적 질환으로 대부분 면역억제 상태에서 바이러스 및 각종 병원체의 감염에 의해서 유발되고 예후가 불량하다. 조직학적으로 림프세망기관의 조직구의 증가와 혈관탐식현상이 빈번히 관찰되고 이와 같은 현상을 보이는 악성조직구증식증과의 감별이 어렵다. 코의 혈관중심위 림프종은 거의 일정한 Epstein-Barr 바이러스(EBV)양성을 보인다고 보고되고 있고 병의 경과중 혈관탐식증추군이 빈번하게 발생되는데 이는 EBV감염에 의해서 유발된다고 보아지고 있다. 재료 및 방법 : 1985년 1월부터 1995년 12까지 강남성모병원과 성바오로병원에서 코의 혈관중심위 림프종으로 진단 받았던 환자 42명 중 혈구탐식증후근을 동반한 10명을 대상으로 임상양상을 관찰하고, 조직표본에 면역조직화학염색법과 교잡반응을 사용하여 악성세포의 표현형을 살펴보고 EBV와의 관련성을 관찰하였다. 결과 : 10명의 환자 중 5명은 혈관중심위 림프종 진단당시, 3명은 재발시기, 2명은 관해 시기에 혈구탐식증후군을 동반하였다. 모든 환자에서 실시된 치료방법에 상관없이 치명적인 경과를 보였으며 중앙생존기간은 18일(2-44일)이었다. 대상 모두에서 T형세포 표현형과 교잡반응상 EBV양성을 보였으며, EBV는 주로 악성림프종세포에 분포양상을 보였다. 결론 : 혈구탐식증추군은 코의 혈관중심위 림프종의 흔한 합병증으로 불량한 예후를 보인다. 임상적 양상 및 조직학적 검사상 악성 조직구증가증과 유사한 소견을 보여 감별이 어렵고, 치명적 결과를 초래하므로 치료에 어려움을 주고 있다. 코의 혈관중심위 림프종과 밀접한 관계를 보이는 EBV에 의해서 유발된다고 보아지고 있으며 치료의 개선을 위하여 앞으로 병인적연구가 필요하다고 생각된다. Malignant histiocytosis(MH)-like hemophagocytic syndrome(HS) is a fatal complication of nasal angiocentric lymphoma(AL) and difficult to distinguish from MH. Ten of total 42 patients with nasal AL had HS and 9 of them were initially suspected to have MH. Five patients had HS as initial manifestation, 3 at the time of relapse, and 2 during the clinical remission of lymphoma. Four patients were treated by combination chemotherapy(CHOP) and others had only supportive care. Immunohistochemical study and in situ hybridization were performed on the specimen obtained from 10 patients. The median survival of all patients from HS was 18 days(range 2 - 44 days) and all had fatal outcome regardless of the treatment-modality. All cases were positive for UCHL1(CD45RO) and Epstein-Barr virus (EBV) by EBER in situ hybridization. MH-like HS is a fatal complication of nasal AL and has a high association with EBV. Reactivation of EBV may contribute to HS and further investigation of predictive factors and effective treatment of HS should be pursued in future.

전파흡수체용 Rubber-Ferrite Composite에 관한 연구

김동일(Dong Il Kim),박연준(Youn Joon Park),박재석(Jae Suck Park) 한국항해항만학회 1996 한국항해항만학회 학술대회논문집 Vol.3 No.-

To realize the RF layer of Rubber Ferrite-Air-Solid Ferrite(RF-A-F) that proposed by Y.Naito, it is tried to grasp the formulation of composition by varying the ratio of mole and element of Complex Isotropic Ferrite Nix - A0.l - Zn(I-x-0.1).Fe204. As a result, it was found that the characteristics of the electromagnetic wave absorber constructed by the selected formulation of compositionin in RF-A-F type were improved.

Ni0.5Cu0.1Zn0.4Fe₂O₄ Ferrite - Rubber Composite의 전파흡수특성에 미치는 열처리 온도의 영향 및 Carbon 첨가효과

윤국태(Kuk-Tae Youn),이찬규(Chan-Gyu Lee),박연준(Youn-Joon Park) 한국자기학회 2001 韓國磁氣學會誌 Vol.11 No.1

The structure, shape, size, and magnetic properties of Ni_(0.5)Cu_(0.1)Zn_(0.4)Fe₂O₄ have been investigated as a function of annealing temperatures. In order to control the microwave absorbing properties of ferrite-rubber composite and the complex losses (magnetic loss and conduction loss), the effect of carbon addition was also studied. It was found that the coercive force decreased with increasing heat-treatment temperatures. Relative complex permeability and reflection loss were measured by the network analyzer. As a result, the natural resonance occurred in the low frequency range, and the matching frequency of the ferrite-rubber composite prepared at 1300℃ was found to be lower. As heat-treatment temperatures were increased, the magnetic loss (μr/μr') and the dielectric loss (εr/εr') were increased. It was caused that the absorption characteristics of the absorber were improved. The conduction loss and magnetic loss were expected to be occurred together because two matching frequencies were shown with carbon addition. It was confirmed that the matching frequency of the microwave absorber could be controlled by controlling heat-treatment temperatures and carbon additions.

고효율 적외선 복사체에 관한 연구

사공건,박연준 東亞大學校 2003 東亞論叢 Vol.40 No.-

In order to get the infrared ray radiator with high efficiency emission, the starting raw material Fez03 powder is heat-treated under the oxygen pressure log[PO_(2)]= -13 -15 at 800℃ for 2 hours. It has shown that the radiation rate was larger than 0.85 at the relatively high temperature(400℃), and almost kept constant the radiation rate with increasing the temperature from 50 to 400℃.

산소분압열처리를 이용한 폐기물산화철로부터의 단상 및 복합상 산화철의 제조

임희대,이찬규,허석환,박연준 國立 昌原大學校 産業技術硏究所 1998 産技硏論文集 Vol.12 No.-

Oxygen pressure heat-treatment with CO-CO2 gas mixture was introduced to purify the waste oxidized iron in shortblast process. To determine the temperture and oxygen partial pressure, Fe-O phase diagrams was used. single phase FeO, Fe₃O₄and composite phase FeO-Fe₃O₄, Fe-FeO could be obtained sucessfully in the range of 10(-17)∼10(-19) in Po₂at 800℃.

Penicillin 고도 내성 폐렴구균에 의한 폐렴과 패혈증 1예

김양리,신완식,송윤상,김호연,강문원,박연준 대한감염학회 1992 감염 Vol.24 No.2

The pneumococus has been an important pathogen of pneumonia in Korea, but there was no problem in treatment due to high susceptibility to penicillin. The incidence of penicillin-resistant pneumococci has been increased after the first report of relatively penicillin-resistant pneumococci in Australia. In our country, penicillin-resistant pneumococcus was isolated first in 1986. We report a case of pneumonia and sepsis caused by highly penicillin-resistant pneumococcus (MIC 16㎍/㎖), which was treated with vancomycin, in a patient with systemic lupus erythematosus.