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중추낙하로 유발된 지반진동에 대한 링월기초 액체저장탱크의 응답 분석
임종진(Lim, Jongjin),하익수(Ha, Ik-Soo) 한국방재학회 2021 한국방재학회논문집 Vol.21 No.2
매립지 지반진동에 의한 링월기초 위의 원통형 강재 구조물의 응답거동 특성을 분석하고 현장 관리시 유의점과 기준치를 제시하기 위하여 현장시험을 수행하였다. 중추를 자유낙하시켜 진동을 발생시켰고, 중추의 낙하고를 조정하여 진동원의 에너지를 변화시켰다. 매립지반의 진동원에 의한 진동영향 분석을 위해 3축 방향 가속도계를 지반 지표면, 콘크리트 포장면, 탱크 벽면에 각각 설치하여 계측하였으며, 계측결과를 통해 최대입자속도(PPV)와 푸리에변환(FFT)에 의해 우세주파수(dominant frequency)를 도출하였다. 링월기초 액체저장탱크가 위치한 콘크리트 포장면(두께 20 cm)에서 진동에너지와 이격거리에 따른 함수로 PPV 예측식을 제안하였으며, 이로부터 산출한 포장면의 PPV와 탱크 벽면의 PPV와의 상관관계를 분석하여 진동특성값인 우세주파수를 고려한 현장관리 기준치를 제안하였다. In this study, on-site tests were performed to analyze the response characteristics of cylindrical steel structures on the ring wall foundation to landfill ground vibration and provide significant safety precautions and reference values for site management. Vibrations were generated through free fall of the weight, and the vibration source energy was changed by adjusting the fall height of the weight. The ground vibration effect on landfill was analyzed by combining the three-axis measurement data to generate the peak particle velocity (PPV), and the dominant frequency results were obtained using the fast Fourier transform. The analyses of the PPV and dominant frequencies on the concrete pavement (20 cm thick), where the liquid storage tank was located, showed a different area of vulnerability to ground vibration on the tank. We also derived an expression to predict the PPV on the concrete pavement as a function of the vibration energy and the distance from the vibration source. The correlation between the PPV on the pavement and the PPV on the tank wall was analyzed. A reference value for on-site management reflecting the dominant frequency, which is a vibration characteristic value, was recommended.
사용자의 다채널 입력 오디오 음원 선택 및 재생 모듈 개발에 관한 연구
정종진(Jung JongJin),임태범(Lim TaeBum),이석필(Lee-SeokPil),임태범(Lim TaeBum),이석필(Lee SeokPil) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
고품질, 고기능 오디오에 대한 대중적인 수요가 증대되고 있는데, 이는 첫째로 레코딩 기술의 발달, 둘째로 저장매체와 발달과 코딩기술의 발달에 의한 오디오 저장 데이터 량의 증가, 또한 디지털 출력회로에 의해 가능해진 저렴한 고음질 오디오 출력장치에 그 원인이 있다고 할 수 있다. 더구나, 발달된 디지털 신호처리 기술로 각종 필터의 구현, 음장제어, 3차원 사운드 효과 등이 가능해져서 시장에서의 수요를 견인하는 새로운 오디오 장치의 개발이 필요한 상황이다. 이러한 요구에 부응하여 디지털 응원들을 입력받아 임의의 필터링을 실행하고, 출력 유닛의 공간적, 음향적 특성을 상위제어기로부터 입력받아 전 신호경로 상에 디지털 신호처리 하여 출력신호를 생성하는 장치가 요구된다. 이는 단순히 청취만 가능했던 기존의 수동적이고 일방적인 오디오 서비스와 달리 청취자가 자신의 취향에 따라 음악을 들을 수 있는 능동적인 오디오 서비스가 가능해졌다.
Lim, Mi-Hee,Jeung, In Cheul,Jeong, Jinyoung,Yoon, Sung-Jin,Lee, Sang-Hyun,Park, Jongjin,Kang, Yu-Seon,Lee, Hansu,Park, Young-Jun,Lee, Hee Gu,Lee, Seon-Jin,Han, Baek Soo,Song, Nam Woong,Lee, Sang Chul Elsevier 2016 Acta Biomaterialia: structure-property-function re Vol.46 No.-
<P><B>Abstract</B></P> <P>Despite the rapid expansion of the biomedical applications of graphene oxide (GO), safety issues related to GO, particularly with regard to its effects on vascular endothelial cells (ECs), have been poorly evaluated. To explore possible GO-mediated vasculature cytotoxicity and determine lateral GO size relevance, we constructed four types of GO: micrometer-sized GO (MGO; 1089.9±135.3nm), submicrometer-sized GO (SGO; 390.2±51.4nm), nanometer-sized GO (NGO; 65.5±16.3nm), and graphene quantum dots (GQDs). All types but GQD showed a significant decrease in cellular viability in a dose-dependent manner. Notably, SGO or NGO, but not MGO, potently induced apoptosis while causing no detectable necrosis. Subsequently, SGO or NGO markedly induced autophagy through a process dependent on the c-Jun N-terminal kinase (JNK)-mediated phosphorylation of B-cell lymphoma 2 (Bcl-2), leading to the dissociation of Beclin-1 from the Beclin-1–Bcl-2 complex. Autophagy suppression attenuated the SGO- or NGO-induced apoptotic cell death of ECs, suggesting that SGO- or NGO-induced cytotoxicity is associated with autophagy. Moreover, SGO or NGO significantly induced increased intracellular calcium ion (Ca<SUP>2+</SUP>) levels. Intracellular Ca<SUP>2+</SUP> chelation with BAPTA-AM significantly attenuated microtubule-associated protein 1A/1B-light chain 3-II accumulation and JNK phosphorylation, resulting in reduced autophagy. Furthermore, we found that SGO or NGO induced Ca<SUP>2+</SUP> release from the endoplasmic reticulum through the PLC β3/IP<SUB>3</SUB>/IP<SUB>3</SUB>R signaling axis. These results elucidate the mechanism underlying the size-dependent cytotoxicity of GOs in the vasculature and may facilitate the development of a safer biomedical application of GOs.</P> <P><B>Statement of Significance</B></P> <P>Graphene oxide (GO) have received considerable attention with respect to their utilization in biomedical applications. However, GO-related safety issues concerning human vasculature are very limited. In this manuscript, we report for the first time the differential size-related biological effects of GOs on endothelial cells (ECs). Notably, Subnanometer- and nanometersized GOs induce apoptotic death in ECs via autophagy activation. We propose a molecular mechanism for the GO-induced autophagic cell death through the PLCβ3/IP3/Ca<SUP>2+</SUP>/JNK signaling axis. Our findings could be provide a better understanding of the GO sizedependent cytotoxicity in vasculature and facilitate the future development of safer biomedical applications of GOs.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
A new perspective on origin of the East Sea Intermediate Water: Observations of Argo floats
Park, JongJin,Lim, Byunghwan Elsevier 2018 Progress in oceanography Vol.160 No.-
<P><B>Abstract</B></P> <P>The East Sea Intermediate Water (ESIW), defined as the salinity minimum in the East Sea (hereafter ES) (Sea of Japan), is examined with respect to its overall characteristics and its low salinity origin using historical Argo float data from 1999 to 2015. Our findings suggest that the ESIW is formed in the western Japan Basin (40–42°N, 130–133°E), especially west of the North Korean front in North Korean waters, where strong negative surface wind stress curl resides in wintertime. The core ESIW near the formation site has temperatures of 3–4 °C and less than 33.98 psu salinity, warmer and fresher than that in the southern part of the ES. In order to trace the origin of the warmer and fresher water at the sea surface in winter, we analyzed the data in three different ways: (1) spatial distribution of surface water properties using monthly climatology from the Argo float data, (2) seasonal variation of heat and salt contents at the formation site, and (3) backtracking of surface drifter trajectories. Based on these analyses, it is likely that the warmer and fresher surface water properties found in the ESIW formation site are attributed to the low-salinity surface water advected from the southern part of the ES in autumn.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The ESIW is likely formed in North Korean waters of the western Japan Basin . </LI> <LI> The ESIW near the formation site has warmer and fresher properties. </LI> <LI> Origin of the ESIW mostly comes from the low salinity Tsushima warm water. </LI> </UL> </P>
전압체배기 구조를 이용한 5.8 ㎓ GaN HEMT F급 정류기
박종진(Jongjin Park),임원섭(Wonseob Lim),양영구(Youngoo Yang) 한국전자파학회 2023 한국전자파학회논문지 Vol.34 No.5
본 논문에서는 전압체배기 구조를 이용한 5.8 ㎓ GaN HEMT F급 정류기에 대한 설계 및 측정결과를 제시한다. 제안된 정류기는 높은 출력 dc 전압 특성을 위해 전압체배기를 사용했고, 고효율 특성 확보를 위해 입력 정합회로에 3차 고조파 임피던스를 개방시키는 기법을 적용했다. 높은 항복전압과 넓은 밴드갭 특성을 갖는 GaN HEMT bare-chip을 다이오드로 사용했고, 이는 높은 입력전력에서 안정적인 동작을 할 수 있다는 장점이 있다. Bare-chip을 PCB와 전기적으로 연결하는 방식을 4가지 제안했고, 최적의 전기적 연결 방식의 검증을 위해 제작 및 측정을 진행했다. 제작된 정류기는 입력 RF 전력 32 ㏈m과 부하저항 1,000 Ω 기준 모든 방식에서 55 % 이상의 RF-dc 변환 효율과 직렬과 병렬 다이오드의 음극을 본드 와이어로, 병렬 다이오드의 양극을 through-wafer via로 PCB와 연결한 회로에서 69 %의 최대 효율을 얻었다. In this study, the design and measurement results of a 5.8 ㎓ GaN HEMT Class-F rectifier using a voltage doubler were proposed. The proposed rectifier employed a voltage doubler for high-output dc voltage characteristics and applied the technique of opening the third-harmonic impedance to an input-matching network to obtain high-efficiency characteristics. A GaN HEMT bare chip with a high breakdown voltage and wide bandgap was used as a diode, which enabled stable operation at a high input power. Four methods of electrically connecting a bare chip to a PCB were proposed, and fabrication and measurements were conducted to verify the optimal electrical connection method. At 5.8 ㎓, with an input RF power of 32 ㏈m and load resistance of 1,000 Ω, the fabricated rectifier exhibited RF-dc conversion efficiency of over 55 % in all methods. Maximum efficiency of 69 % was obtained in a circuit in which the cathodes of series and parallel diodes were connected to the PCB with bond-wires, and the anode of the parallel diode was connected to the PCB with through-wafer via.