Crustal structure of the Gunsan Basin in the SE Yellow Sea from ocean bottom seismometer (OBS) data and its linkage to the South China Block

Kim, Han-Joon,Kim, Chung-Ho,Hao, Tianyao,Liu, Lihua,Kim, Kwang-Hee,Jun, Hyunggu,Jou, Hyeong-Tae,Moon, Sunghoon,Xu, Ya,Wu, Zhiqiang,Lu, Chuanchuan,Lee, Sang Hoon Elsevier 2019 Journal of Asian earth sciences Vol.180 No.-

<P><B>Abstract</B></P> <P>Two major tectonic units in NE Asia are the Sino-Korean (or North China) and South China Blocks that collided in the Permo-Triassic periods. The South China Block is suggested to extend eastward to the Korean Peninsula across the southern Yellow Sea. The Gunsan Basin is a well-defined, fault-bounded sedimentary basin in the SE Yellow Sea and is regarded as a structural link of the South China Block to the Korean Peninsula. We collected deep seismic sounding data recorded on ocean bottom seismometers to investigate how the crustal structure and nature of the South China Block vary in the Gunsan Basin toward the middle part of the Korean Peninsula. The main part of the Gunsan Basin is underlain by relatively thin (∼10 km thick) upper and much thicker (∼20 km thick) lower crustal layers, indicating a close affinity to the South China Block; whereas it shows distinction from the Korean Peninsula underlain by upper and lower crustal layers with equal (∼15 km) thickness. A change in crustal structure is recognized under the eastern margin of the Gunsan Basin toward the Korean Peninsula, that features a transition to the Korean Peninsula. The thick lower crustal layer in the Gunsan Basin appears to be inherited from the evolution of the South China Block including crustal shortening associated with the assembly of Rodinia in the Neoproterozoic before the collision between the Sino-Korean and South China Blocks.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We image how the crustal stucture nature vary in the SE Yellow Sea. </LI> <LI> The Gunsan Basin is underlain by relatively thin upper and much thick lower crustal layers. </LI> <LI> A transition in crustal structure is recognized from the South China Block to the Korean Peninsula. </LI> <LI> The crustal structure is inherited from the growth of Rodinia. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Structural basis for the substrate recognition of peptidoglycan pentapeptides by <i>Enterococcus faecalis</i> VanY_B

Kim, Hyoun Sook,Hahn, Hyunggu,Kim, Jieun,Jang, Dong Man,Lee, Ji Yeon,Back, Jang Mi,Im, Ha Na,Kim, Haelee,Han, Byung Woo,Suh, Se Won Elsevier 2018 INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES Vol.119 No.-

<P><B>Abstract</B></P> <P>Vancomycin resistance in <I>Enterococci</I> and its transfer to methicillin-resistant <I>Staphylococcus aureus</I> are challenging problems in health care institutions worldwide. High-level vancomycin resistance is conferred by acquiring either transposable elements of the <I>VanA</I> or <I>VanB</I> type. <I>Enterococcus faecalis</I> VanY<SUB>B</SUB> in the <I>VanB</I>-type operon is a <SMALL>D</SMALL>,<SMALL>D</SMALL>-carboxypeptidase that recognizes the peptidyl-<SMALL>D</SMALL>-Ala<SUP>4</SUP>-<SMALL>D</SMALL>-Ala<SUP>5</SUP> extremity of peptidoglycan and hydrolyses the terminal <SMALL>D</SMALL>-Ala on the extracellular side of the cell wall, thereby increasing the level of glycopeptide antibiotics resistance. However, at the molecular level, it remains unclear how VanY<SUB>B</SUB> manipulates peptidoglycan peptides for vancomycin resistance. In this study, we have determined the crystal structures of <I>E. faecalis</I> VanY<SUB>B</SUB> in the <SMALL>D</SMALL>-Ala-<SMALL>D</SMALL>-Ala-bound, <SMALL>D</SMALL>-Ala-bound, and -unbound states. The interactions between VanY<SUB>B</SUB> and <SMALL>D</SMALL>-Ala-<SMALL>D</SMALL>-Ala observed in the crystal provide the molecular basis for the recognition of peptidoglycan substrates by VanY<SUB>B</SUB>. Moreover, comparisons with the related VanX and VanXY enzymes reveal distinct structural features of <I>E. faecalis</I> VanY<SUB>B</SUB> around the active-site cleft, thus shedding light on its unique substrate specificity. Our results could serve as the foundation for unravelling the molecular mechanism of vancomycin resistance and for developing novel antibiotics against the vancomycin-resistant <I>Enterococcus</I> species.</P>

보조정보에 기반한 가변 얼굴템플릿의 이진화 방법의 연구

이형구(Hyunggu Lee),김재희(Jaihie Kim) 大韓電子工學會 2010 電子工學會論文誌-SP (Signal processing) Vol.47 No.1

가변생체인식 방법 (Cancelable Biometrics)은 생체정보의 도난이나 도용으로부터 강인하며 재생성 가능한 생체템플릿을 제공하는 높은 보안성을 갖는 생체 인식방법이다. 본 논문은 가변얼굴인식 방법의 하나로써 얼굴생체템플릿을 나머지에 기반하여 이진화하는 방법을 제안한다. 이진화를 위한 입력 값으로, 우리의 기존 연구 결과로서의 가변얼굴템플릿을 이용하였다. 이 가변얼굴템플릿은 상이한 두 개의 형상 기반의 얼굴특징추출 방법 (Appearance based face recognition)을 이용하여 두 개의 얼굴특징벡터를 추출하고, 추출된 두 개의 얼굴특징벡터를 재배열 후 합하여 얻어진다. 우리의 기존방법으로 얻어진 얼굴특징벡터는 실수 값을 갖기 때문에 저장 시 기존의 암호화 방법과의 접목이 힘들며 원래의 생체정보 노출에 대한 잠정적인 위협이 될 수 있다. 본 논문의 나머지에 기반한 이진화 방법은 우리의 기존 가변얼굴템플릿에서 부분정보인 나머지를 이용하여 이진비트열을 생성하므로 향상된 보안성을 제공한다. 또한 본 논문의 이진화 기법은 합해진 특징벡터의 통계적인 특징으로부터 정의된 보조정보 (Helper data)를 이용하여 높은 인식 성능을 갖는다. 제안방법은 보조정보가 노출된 경우에서도 이진화된 가변얼굴템플릿이 원 얼굴특징벡터보다 향상된 인식성능을 보장한다. 제안하는 방법은 the extended YALEB face database를 이용하여 성능과 보안성에 대하여 평가 하였다. Cancelable biometrics is a robust and secure biometric recognition method using revocable biometric template in order to prevent possible compromisation of the original biometric data. In this paper, we present a new cancelable bits extraction method for the facial data. We use our previous cancelable feature template for the bits extraction. The adopted cancelable template is generated from two different original face feature vectors extracted from two different appearance-based approaches. Each element of feature vectors is re-ordered, and the scrambled features are added. With the added feature, biometric bits string is extracted using helper data based method. In this technique, helper data is generated using statistical property of the added feature vector, which can be easily replaced with straightforward revocation. Because, the helper data only utilizes partial information of the added feature, our proposed method is a more secure method than our previous one. The proposed method utilizes the helper data to reduce feature variance within the same individual and increase the distinctiveness of bit strings of different individuals for good recognition performance. For a security evaluation of our proposed method, a scenario in which the system is compromised by an adversary is also considered. In our experiments, we analyze the proposed method with respect to performance and security using the extended YALEB face database.

가변 얼굴 영상의 합성 방법에 관한 연구

이형구(Hyunggu Lee),이철한(Chulhan Lee),최정윤(Jeung-Yoon Choi),김재희(Jaihie Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11

Cancelable biometrics has been introduced for secure usage of biometric data in biometric recognition system. Cancelable template is a revocably and non-invertibly transformed version of original biometric data. Normally, the face biometric data can be interpreted by machine and human. However, due to non-invertible transform, cancelable template cannot be understood by human. In this paper, we propose a method about human interpretable face image synthesis. Because, face image is synthesized using revocable cancelable template, synthesized face image is also revocable. In other words, we can simply regenerate face image with newly issued cancelable template.

Biometric bits extraction through phase quantization based on feature level fusion

Lee, Hyunggu,Teoh, Andrew Beng Jin,Kim, Jaihie Springer-Verlag 2011 Journal of Telecommunication systems Vol.47 No.3

ATC/ATO 운영환경에서의 무인운전(DTO/UTO)방식 도입을 위한 열차운행 시스템에 대한 기술적 고려사항 연구

전형구(HyungGu Jeon),이덕규(DukGyu Lee),유근규(GuenGyu Yoo),송용훈(YongHoon Song),정희준(HeeJun Jeong),김구식(GooSik Kim),임소희(SoHui Lim) 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.11

도시철도에 대한 사회적 필요성 증가와 신속·정확한 이동을 요구하는 고객의 니즈를 충족하고, 경제적이면서 보안 및 안전성이 강화된 도시철도 운영이 절실히 요구되는 현실에 직면하고 있다. 현재 서울도시철도는 저렴한 투자비용과 효율적인 운영을 위하여 8호선 완전자동운전 시험을 통해 ATC/ATO 운영환경에서 새로운 열차 운행 및 통제를 위한 개선방안을 연구하고 있다. 본 논문에서는 ATC/ATO 시스템에서 무인운전(UTO/DTO)운영에 대한 최적의 운영과 활용방안을 열차운행 차상/지상 시스템 관점에서 고찰하고자 한다. The urban transit railway is facing the challenge to increase the social demand for metro, to satisfy the rapid and punctual movement, and to operate economically enhanced security and safety train. This paper discusses upgrading new train control system with ATC/ATO for low costs and effective operations in Seoul Metropolitan Rapid Transit through Driverless train operation test in the Seoul 8 line. This paper also presents the best operability and availability of driverless operation(UTO/DTO) with ATC/ATO in view of onboard and wayside systems.

A low-cost, wide-band DCO with an on-chip 3-D solenoid inductor in 0.13 μm digital CMOS

Park, HyungGu,Kim, SoYoung,Lee, Kang-Yoon Springer-Verlag 2013 Analog Integrated Circuits and Signal Processing Vol.74 No.3

Hydrothermal Synthesis of CaMn2O4·xH2O Nanorods as Co-Catalysts on GaN Nanowire Photoanode

Bae Hyojung,Kim Hyunggu,Burungale Vishal,Min Jung‐Wook,Cha An‐na,Rho Hokyun,Ryu Sang‐Wan,Kang Soon Hyung,Ha Jun‐Seok 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.6

Co-catalysts play a crucial role in photoelectrochemical (PEC) water splitting reactions by improving slow kinetics and reducing surface recombination, thereby enhancing PEC performance. However, achieving a well-defined interface between low-dimensional semiconductors and co-catalysts is challenging due to difficulties in depositing a uniform co-catalyst layer and attaining mixed and disordered states. CaMn2O4 xH2O has been extensively studied for the purpose of decreasing the overpotential in the oxygen evolution reaction. In this study, CaMn2O4xH2O was synthesized via a hydrothermal method, and loaded onto a GaN nanowire (NW) photoanode. Optimized CaMn2O4xH2O layers were decorated on GaN NWs to create CaMn2O4@GaN, which delivered a maximum photocurrent of 0.4 mA/cm2 at 0 V vs. the Ag/AgCl reference electrode under an AM 1.5 G solar simulator, 1.6-fold higher than that (0.25 mA/cm2) of bare GaN NWs. Thus, highly efficient and stable PEC water splitting was achieved on the GaN NW photoanode.

Subspace based face synthesis method for cancelable face biometrics

Chulhan Lee,Hyunggu Lee,Jeung-Yoon Choi,Jongsun Kim,Jaihie Kim 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7

노인의 스마트폰 사용 능력 향상을 위한 대형언어모델 기반 앱 디자인

김민욱(Minuk Kim),정형구(Hyunggu Jung) 한국HCI학회 2024 한국HCI학회 학술대회 Vol.2024 No.1

스마트폰의 보급 및 활용의 증가는 의사 소통, 정보 접근 측면에서 사람들의 삶의 질을 크게 향상시켰다. 그러나 신체적, 인지적 능력 저하로 인해 스마트폰 사용 능력이 떨어지는 노인 사용자에게는 오히려 디지털 기기가 사회적 참여와 정보 접근을 어렵게 만드는 제약 요인으로 작용한다. 국내 노인 인구가 점차 증가하고 있는 현 상황에서 계층 간 디지털 격차는 더욱 되었고, 노인 사용자의 스마트폰 사용능력을 지속적으로 향상시키는 방안에 대한 연구는 필수적이다. 본 연구에서는 디자인적 사고 방법론에 따라 노인 스마트폰 사용자 5 명을 인터뷰하였고 노인 사용자들이 스마트폰을 사용하는 과정에서 경험하였던 불편한 점들을 발견하였다. 이에 대한 해결방안으로 대형 언어모델(Large Language Model)을 활용해 노년층의 스마트폰 사용능력을 지속적으로 향상시킬 수 있는 앱의 디자인을 제시했고 이를 Low-fi 프로토타입으로 발전시켜 제작하고 평가받았다.