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고분자캐패시터에 대한 충방전 조건에서의 온도에 따른 정전용량감소 특성 연구
정의효(Ui-Hyo Jeong),임홍우(Hong-Woo Lim),형재필(Jae-Phil Hyung),고민지(Min-Ji Ko),정창욱(Chang-Uk Jung),조정하(Jeong-Ha Cho),장중순(Joong-Soon Jang) 한국신뢰성학회 2017 신뢰성응용연구 Vol.17 No.1
Purpose: Polymer capacitors are known to have very high reliability as compared with liquid electrolytic capacitors, but their capacity has been reported to decrease in charge and discharge at low temperature. The purpose of this study to clarify these characteristics. Methods: In order to clarify these characteristics, charging-discharging tests were carried out for 200 hours with three different capacities and at 5 different temperature from 5℃ to 100℃. Results: As a result of the test, it was confirmed that the capacity of the polymer capacitor was decreased with higher capacity and lower temperature. Conclusion: Such a failure phenomenon was caused by the shrinkage and expansion characteristics of the polymer used therein, it is presumed that this failure phenomenon is due to the complex pore structure made by etching.
정의효(Ui-Hyo Jeong),형재필(Jae-Phil Hyung),임성용(Seong-Yong Lim),임홍우(Hong-Woo Lim),장중순(Joong-Soon Jang) 한국신뢰성학회 2014 신뢰성응용연구 Vol.14 No.3
Electrodeless lamp is famous for its long life. But its reliability is dependent not only on electrodes but also on materials and structures. To evaluate end product’s reliability, we studied high temperature durability by 60℃, 75 ℃ and 90 ℃ temperature tests, and predicted failure times by an exponential model through regression analysis. However, the test showed that temperature does not affect degradation of electrodeless lamps. Their luminous outputs degrade during the early time of the test (till 250 hours) and then converge to a saturation points. Also, ‘410nm ~ 530nm’ spectrum degrades more than other spectra.
지그비 모듈용 미앤더 슬롯 안테나 설계 및 반사손실 개선에 관한 연구
이영순(Young-Soon Lee),김의중(Ui-Jung Kim),김병삼(Byoung-Sam Kim),장봉기(Bong-Ki Jang) 한국항해항만학회 2010 한국항해항만학회지 Vol.34 No.3
지그비 모듈용 소형 PCB안테나를 30mm×8mm의 좁은 영역으로 제한된 공간에서 구현함과 동시에 안테나의 반사손실을 개선시키기 위하여, 기생소자로 접지면과 이격되는 도체를 가지는 미앤더 슬롯 안테나가 제안된다. 본 논문을 통해 설계되어 제작된 안테나의 공진주파수는 대략 2.44GHz이고, 대역폭은 113MHz(VSWR≤2)이다. 방사패턴은 동작주파수영역에서 다이폴 안테나의 방사특성과 거의 유사하고, 안테나의 효율 및 이득은 각각 60% 및 2.7dBi이상의 값을 가진다. 이러한 안테나의 모든 특성들은 지그비에 응용되기 위해 요구되어지는 규격을 모두 만족함을 알 수 있다. 본 논문이 제안하는 안테나의 타당성을 보여주기 위해 모의실험 결과 및 측정결과를 비교하여 제시하였다. In order to design small printed antenna restricted within narrow area of 30mm×8mm for the Zigbee module and improve its return loss, meander slot antenna with a floating conductor as the parastic element has been proposed. The resonant frequency and bandwidth(VSWR≤2) of the antenna designed and fabricated in the present study is about 2.44GHz and 113MHz respectively. The radiation pattern is almost similar to that of dipole antenna within the operation frequency range. Also the radiation efficiency and gain of the proposed antenna is more than 60% and 2.7dBi respectively. It has been observed that the characteristics the proposed antenna mentioned above satisfy the specification required of the Zigbee application. In order to validate the proposed antenna, some simulated and measured results are presented and compared.
공통의 Glass를 이용한 LTCC 이종소재의 무수축 접한
장의경,신효순,여동훈,김종희,Jang, Ui-Kyeong,Shin, Hyo-Soon,Yeo, Dong-Hun,Kim, Jong-Hee 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.12
To improve warpage, delamination and the chemical reaction between 2 different co-fired materials, the bonding behavior with common glass was studied. As shown in the previous paper, the phenomenon of the infiltration is different with the composition of the glass. In particular, in the case of low temperature melting glass, infiltration is experimented in this study. GA-1 glass is infiltrated among $BaTiO_3$ particles below $800^{\circ}C$ and is made by glass/ceramic composite. Until the laminate is fired under $850^{\circ}C$, provskite phase is observed. Although in the case of GA-12 glass, the temperature of the glass infiltration is lower than it of GA-l glass, the perovskite phase already disappears at $800^{\circ}C$. As a result, GA-1 and GA-12 glasses are infiltrated among particles at low temperature, however, the chemical reactivity of the glass/ceramic and sintering temperature should be considered.
The rapid adaptation of SARS-CoV-2–rise of the variants: transmission and resistance
Soh Sandrine M.,Kim Yeongjun,Kim Chanwoo,Jang Ui Soon,Lee Hye-Ra 한국미생물학회 2021 The journal of microbiology Vol.59 No.9
The causative factor of COVID-19, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is continuously mutating. Interestingly, identified mutations mainly occur in the spike (S) protein which interacts with the ACE2 receptor and is cleaved via serine protease TMPRSS2. Some mutated strains are becoming dominant in various parts of the globe because of increased transmissibility as well as cell entry efficacy. Remarkably, the neutralizing activity of monoclonal antibodies, convalescent sera, and vaccines against the variants has been reported to be significantly reduced. Therefore, the efficacy of various monoclonal antibodies therapy and vaccines against these variants is becoming a great global concern. We herein summarize the current status of SARS-CoV- 2 with gears shifted towards the recent and most common genetic variants in relation to transmission, neutralizing activity, and vaccine efficacy.
RF 리모컨용 마이크로스트립 급전 개방 종단을 갖는 미앤더 슬롯 안테나
진정희,김의중,장수영,이영순,조영기,Jin, Jeong-Hi,Kim, Ui-Jung,Jang, Soo-Young,Lee, Young-Soon,Cho, Young-Ki 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.2
본 논문에서는 400 MHz ISM 대역에서 사용 가능한 마이크로스트립 선로로 급전되는 개방 종단을 갖는 미앤더 슬롯 안테나를 새롭게 제안하였다. 본 논문에서 제안된 슬롯 안테나와 기존의 슬롯 안테나의 주된 차이점은 좁은 범위로 제약된 공간에서 기존의 슬롯 안테나를 소형화하기 위하여 개방 종단을 도입했다는 점이다. 본 논문이 제안하는 안테나의 타당성을 검토하기 위하여 공진 주파수 및 방사 패턴의 결과를 시뮬레이션해 보았고, 그 결과들을 실험적으로 측정해 보았다. 본 논문이 제안하는 안테나의 공진 주파수 및 방사 패턴의 시뮬레이션 결과와 측정 결과가 잘 일치함을 알 수 있었다. A meander slot antenna with open-end fed by a microstrip line which can be used at 400 MHz ISM band is newly proposed. The main difference between the proposed slot antenna and the previous slot antenna is the introduction of the open-end to miniaturize the previous meander slot antenna in the space restricted within narrow limit. In order to check the validity of the proposed antenna, the resonant frequency and radiation pattern of the proposed antenna have been simulated and examined. Good agreements between simulated results and measured results have been observed.