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Effectiveness of gastric cancer screening programs in South Korea:Organized vs opportunistic models

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World Journal of Gastroenterology 2013年第5期19卷 736-741页

作者： Beom jin Kim Chae heo Byoung Kwon Kim Jae Yeol Kim Jae gyu Kim Department of Internal Medicine Chung-Ang University College of MedicineHeukseok-dongDongjak-guSeoul 156-755South Korea Department of Pathology Green Cross Reference Laboratory314 Pojung-dongGiheung-guYongin-siKyunggi-do 446-913South Korea

AIM:To investigate the outcome and effectiveness of two screening programs,National Cancer Screening Program(NCSP)and opportunistic screening(OS),for the detection of gastric cancer. METHODS:A total of 45 654 subjects underwent upper endoscopy as part of the NCSP or OS at the Chung-Ang University Healthcare System in Korea between January 2007 and December *** study population was comprised of subjects over the age of 40 *** specifically,subjects who took part in the NCSP were Medicaid recipients and beneficiaries of the National Health Insurance *** photo-graphs from the endoscopies diagnosed as gastric cancer were reviewed by two experienced endoscopists. RESULTS:The mean age of the screened subjects was 55 years for men and 54 years for women.A total of 126 cases(0.28%)of gastric cancer were detected from both screening programs;100 cases(0.3%)from NCSP and in 26 cases(0.2%)from *** proportion of early gastric cancer(EGC)detected in NCSP was higher than that in OS(74.0%vs 53.8%,P=0.046). Among the 34 416 screenees in NCSP,6585(19.1%) underwent upper endoscopy every other year as *** the 11 238 screenees in OS,3050(27.1%) underwent upper endoscopy at least once every two years during the study *** detection rate of gastric cancer was found to be significantly higher during irregular follow-up than during regular follow-up in both screening programs(0.3%vs 0.2%,P=0.036).A higher incidence of EGC than advanced gastric cancer was observed during regular follow-up compared with irregular follow-up. CONCLUSION:Compliance to the screening program is more important than the type of screening system used.

关键词： Gastric cancer National Cancer Screening Program Opportunistic screening Early gastric cancer

Identification and comparison of the local physicochemical structures of transition metal-based layered double hydroxides for high performance electrochemical oxygen evolution reactions

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Journal of Energy Chemistry 2023年第12期87卷 89-97,I0004页

作者： Min Sung Kim Bipin Lamichhane Ju-Hyeon Lee jin-gyu Bae Jeong Yeon heo Hyeon Jeong Lee Shyam Kattel Ji Hoon Lee School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea KNU Advanced Material Research Institute Kyungpook National UniversityDaegu 41566Republic of Korea Department of Materials Science and Engineering Ulsan National Institute of Science and TechnologyUlsan 44919Republic of Korea Department of Physics Florida A&M UniversityTallahasseeFlorida 32307United States

Layered double hydroxides(LDHs) have attracted considerable attention as a cost effective alternative to the precious iridium-and ruthenium-based electrocatalysts for an oxygen evolution reaction(OER),a bottleneck of water electrolysis for sustainable hydrogen *** their excellent OER performance,the structural and electronic properties of LDHs,particularly during the OER process,remain to be poorly *** this study,a series of LDH catalysts is investigated through in situ X-ray absorption fine structure analyses and density functional theory(DFT) *** experimental results reveal that the LDH catalyst with equal amounts of Ni and Fe(NF-LDH) exhibits the highest OER activity and catalytic life span when compared with its counterparts having equal amounts of Ni and Co(NC-LDH)and Ni only(Ni-LDH).The NF-LDH shows a markedly enhanced OER kinetics compared to the NC-LDH and the Ni-LDH,as proven by the lower overpotentials of 180,240,and 310 mV,respectively,and the Tafel slopes of 35.1,43.4,and 62.7 mV dec^(-1),*** DFT calculations demonstrate that the lowest overpotential of the NF-LDH is associated with the active sites located at the edge planes of NF-LDH in contrast to those located at the basal planes of Ni-LDH and *** current study pinpoints the active sites on various LDHs and presents strategies for optimizing the OER performance of the LDH catalysts.

关键词： Layered double hydroxides Oxygen evolution reaction In situ X-ray analyses Density functional theory Catalytic active sites

Acetylacetone-TiO_(2) Promoted Large Area Compatible Cascade Electron Transport Bilayer for Efficient Perovskite Solar Cells

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Energy & Environmental Materials 2024年第2期7卷 221-228页

作者： Hyong Joon Lee jin Kyoung Park jin Hyuck heo Sang Hyuk Im Department of Chemical and Biological Engineering Korea University145 Anam-ro Seongbuk-guSeoul 17104Korea

In designing efficient perovskite solar cells(PSCs),the selection of suitable electron transport layers(ETLs)is critical to the final device performance as they determine the driving force for selective charge ***_(2)nanoparticles(NPs)based ETLs have been a popular choice for PSCs due to superior electron mobility,but their relatively deep-lying conduction band energy levels(ECB)result in substantial potential ***,TiO_(2)NPs establish favorable band alignment owing to shallower ECB,but their low intrinsic mobility and abundant surface trap sites impede the final *** this reason,constructing a cascaded bilayer ETL is highly desirable for efficient PSCs,as it can rearrange energy levels and exploit on advantages of an individual *** this study,we prepare SnO_(2)NPs and acetylacetone-modified TiO_(2)(Acac-TiO_(2))NPs and implement them as bilayer SnO_(2)/Acac-TiO_(2)(BST)ETL,to assemble cascaded energy band ***_(2)contributes to rapid charge carrier transport from high electron mobility while Acac-TiO_(2)minimizes band-offset and effectively suppresses interfacial ***,the optimized BST ETL generates synergistic influence and delivers power conversion efficiency(PCE)as high as 23.14%with open-circuit voltage(V_(oc))reaching 1.14 ***,the BST ETL is transferred to a large scale and the corresponding mini module demonstrates peak performance of 18.39%PCE from 25 cm^(2)aperture ***,the BST-based mini module exhibit excellent stability,maintaining 83.1%of its initial efficiency after 1000 h under simultaneous 1 Sun light-soaking and damp heat(85℃/RH 85%)environment.

关键词： acetylacetone large area perovskite solar cells TiO_(2)

A Quantum Network System of QSS-QDC Using χ-Type Entangled States

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Chinese Physics Letters 2012年第5期29卷 22-25页

作者： Chang Ho Hong jin O heo Jong in Lim Hyung jin Yang Graduate School of Information Management and Security Korea UniversitySungbuk-gu Anam 5-gaSeoulSouth Korea Center for Information Security Technologies(CIST) Korea UniversitySeoulSouth Korea Department of Physics Korea UniversityChochiwonChoongnamSouth Korea

A multiuser quantum direct communication network system for N users utilizing χ-type entangled states is prupused. The network system is composed of a communication center,N users,and N quantum lines linking the center and the N *** is no quantum line among users,and therefore only N quantum lines are necessary for communication between *** one χ-type entangled state, in this protocol we are able to send two bits of information through direct communication and,at the same time,share two bits of quantum keys. The security of the protocol is then analyzed.

关键词： quantum system utilizing

Bidirectional quantum teleportation of unknown photons using path-polarization intra-particle hybrid entanglement and controlled-unitary gates via cross-Kerr nonlinearity

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Chinese Physics B 2015年第5期24卷 210-222页

作者： jino heo Chang-Ho Hong Jong-In Lim Hyung-jin Yang Graduate School of Information Security (GSIS) Korea University Center for Information Security Technologies (CIST) Korea University Department of Physics Korea University

We propose an arbitrary controlled-unitary （CU） gate and a bidirectional quantum teleportation （BQTP） scheme. The proposed CU gate utilizes photonic qubits （photons） with cross-Kerr nonlinearities （XKNLs）, X-homodyne detectors, and linear optical elements, and consists of the consecutive operation of a controlled-path （C-path） gate and a gathering-path （G- path） gate. It is almost deterministic and feasible with current technology when a strong coherent state and weak XKNLs are employed. Based on the CU gate, we present a BQTP scheme that simultaneously teleports two unknown photons between distant users by transmitting only one photon in a path-polarization intra-particle hybrid entangled state. Consequently, it is possible to experimentally implement BQTP with a certain success probability using the proposed CU gate.

关键词： cross-Kerr nonlinearity bidirectional quantum teleportation intra-particle hybrid entanglement

A Quantum Communication Protocol Transferring Unknown Photons Using Path-Polarization Hybrid Entanglement

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Chinese Physics Letters 2013年第4期30卷 5-9页

作者： jino heo Chang Ho Hong Jong In Lim Hyung jin Yang Graduate School of Information Security Korea UniversityAnam 5-ga Sungbuk-guSeoulSouth Korea Center for Information Security Technologies(CIST) Korea UniversitySeoulSouth Korea Department of Physics Korea UniversityYunki-gun ChochiwonChoongnamSouth Korea

We propose a protocol for transferring photons of unknown states to a distant location using path-polarization hybrid *** protocol uses a polarizing beam splitter(PBS),a beam splitter(BS),a CNOT-operation,four unitary operations and polarizing *** our protocol,the hybrid entangled states are generated by the PBS,and it is transmitted through the quantum channel containing the BS and *** measurement results of the polarizing detectors and classical communications determine which unitary operation will be used in the last step for recovering initial *** security of the channel in transmitting unknown photons between two parties is confirmed by the results of the measurement of each target photon in the control mode.

关键词： unitary Polarization operations

Bidirectional transfer of quantum information for unknown photons via cross-Kerr nonlinearity and photon-number-resolving measurement

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Chinese Physics B 2016年第2期25卷 82-92页

作者： jino heo Chang-Ho Hong Dong-Hoon Lee Hyung-jin Yang Graduate School of Information Security (GSIS) Korea University Center for Information Security Technologies (CIST) Korea University Department of Physics Korea University

We propose an arbitrary controlled-unitary （CU） gate and a bidirectional transfer scheme of quantum information （BTQI） for unknown photons. The proposed CU gate utilizes quantum non-demolition photon-number-resolving measure- ment based on the weak cross-Kerr nonlinearities （XKNLs） and two quantum bus beams; the proposed CU gate consists of consecutive operations of a controlled-path gate and a gathering-path gate. It is almost deterministic and is feasible with current technology when a strong amplitude of the coherent state and weak XKNLs are employed. Compared with the existing optical multi-qubit or controlled gates, which utilize XKNLs and homodyne detectors, the proposed CU gate can increase experimental realization feasibility and enhance robustness against decoherence. According to the CU gate, we present a BTQI scheme in which the two unknown states of photons between two parties （Alice and Bob） are mutually swapped by transferring only a single photon. Consequently, by using the proposed CU gate, it is possible to experimentally implement the BTQI scheme with a certain probability of success.

关键词： cross-Kerr nonlinearity quantum non-demolition photon-number-resolving measurement bidirec-tional transfer of quantum information

Quantum secure direct communication network with hyperentanglement

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Chinese Physics B 2014年第9期23卷 107-111页

作者： Chang Ho Hong jino heo Jong In Lim Hyung jin Yang Graduate School of Information Management and Security Korea University Center for Information Security Technologies (CIST) Korea University Department of Physics Korea University Graduate School of Information Security (GSIS) Korea University

We propose a quantum secure direct communication protocol with entanglement swapping and hyperentanglement. Any two users, Alice and Bob, can communicate with each other in a quantum network, even though there is no direct quantum channel between them. The trust center, Trent, who provides a quantum channel to link them by performing entanglement swapping, cannot eavesdrop on their communication. This protocol provides a high channel capacity because it uses hyperentanglement, which can be generated using a beta barium borate crystal.

关键词： quantum secure direct communication hyperentanglement

Controlled mutual quantum entity authentication using entanglement swapping

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Chinese Physics B 2015年第9期24卷 116-124页

作者： Min-Sung Kang Chang-Ho Hong jino heo Jong-In Lim Hyung-jin Yang Center for Information Security Technologies (CIST) Korea University Graduate School of Information Security Korea University Department of Physics Korea University

In this paper, we suggest a controlled mutual quantum entity authentication protocol by which two users mutually certify each other on a quantum network using a sequence of Greenberger–Horne–Zeilinger（GHZ）-like states. Unlike existing unidirectional quantum entity authentication, our protocol enables mutual quantum entity authentication utilizing entanglement swapping; moreover, it allows the managing trusted center（TC） or trusted third party（TTP） to effectively control the certification of two users using the nature of the GHZ-like state. We will also analyze the security of the protocol and quantum channel.

关键词： quantum authentication quantum cryptography quantum communication GHZ-like state