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문대성(Daesung Moon),최우용(Woo-Yong Choi),문기영(Kiyoung Moon) 한국정보보호학회 2009 정보보호학회논문지 Vol.19 No.1
사용자 인증을 위해 저장된 중요한 바이오정보가 타인에게 유출되어 도용된다면 패스워드나 PIN과 달리 변경이 불가능하므로 심각한 문제를 일으킬 수 있다. 따라서 타인에게 유출되더라도 재사용이 불가능하도록 하기 위하여 사용자의 바이오정보에 역변환이 불가능한 함수를 적용하여 저장하고 변환된 상태에서 인증과정을 수행할 수 있는 방법이 필요하다. 최근 바이오정보를 안전하게 보호하기 위해 암호학적 방법으로 연구되어지고 있는 퍼지볼트 이론을 지문정보에 적용하는 연구가 활발히 진행되고 있다. 그러나 대부분의 연구들이 지문 특징점의 개수를 고려하지 않고 고정된 차수의 다항식을 선택하기 때문에 지문영상에서 특징점의 개수가 다항식의 차수보다 적을 경우 동작하지 못하는 문제점이 발생한다. 본 논문에서는 지문 퍼지볼트의 보안성과 인식성능을 향상시키기 위해서 다항식의 차수를 특징점의 개수에 따라 가변적으로 선택하는 방법을 제안한다. 특히, 낮은 차수의 다항식을 사용할 경우 두 개 이상의 서로 다른 다항식을 사용하여 보안성을 향상시킬 수 있다. 실험을 통하여 제안한 방법은 보안성과 인식성능이 향상되는 것을 확인하였다. Security of biometric data is particularly important as the compromise of the data will be permanent. To protect the biometric data, we need to store it in a non?invertible transformed version. Thus, even if the transformed version is compromised, its valid biometric data are securely remained. Fuzzy vault mechanism was proposed to provide cryptographic secure protection of critical data(e.g., encryption key) with the fingerprint data in a way that only the authorized user can access the critical data by providing the valid fingerprint. However, all the previous results cannot operate on the fingerprint image with a few minutiae, because they use fixed degree of the polynomial without considering the number of fingerprint minutiae. To solve this problem, we use adaptive degree of polynomial considering the number of minutiae. Also, we apply multiple polynomials to operate the fingerprint with a few minutiae. Based on the experimental results, we confirm that the proposed approach can enhance the security level and verification accuracy.
Direct Growth of Graphene on Insulating Substrate by Laminated (Au/Ni) Catalyst Layer
Ko, Yong Hun,Kim, Yooseok,Jung, Daesung,Park, Seung Ho,Kim, Ji Sun,Shim, Jini,Yun, Hyeju,Song, Wooseok,Park, Chong-Yun The Korean Vacuum Society 2015 Applied Science and Convergence Technology Vol.24 No.4
A direct growth method of graphene on insulating substrate without catalyst etching and transfer process was developed using Au/Ni/a-C catalyst system. During the growth process, behavior of the Au/Ni catalyst was investigated using EDX, XPS, SEM, and Raman spectroscopy. The Au/Ni catalyst layer was evaporated during growth process of graphene. The graphene film was composed mono-layer flakes. The transmittance of the graphene film was ~80.6%.
Improved Transmission Method of Cluster Head in WSN Protocol
Jong-Yong Lee,Daesung Lee 한국정보통신학회 2018 2016 INTERNATIONAL CONFERENCE Vol.10 No.1
A wireless sensor network is a network in which nodes equipped with sensors capable of collecting data from the real world are configured wirelessly. Because the sensor nodes are configured wirelessly, they have limited power such as batteries. So, for a network to be used for a long time, it needs to optimize the energy consumed to minimize energy consumption. There are many wireless sensor network protocols to improve energy efficiency, among which LEACH Protocol is a typical. However, this is only for member nodes belonging to the cluster. When the cluster head node is far from the base station, energy consumption is also increased. In this paper, we will improve the cluster head node transmission method to improve the transmission problem of the cluster head node.
Improvement of CH election in three-level heterogeneous WSN
Jong-Yong Lee,Daesung Lee 한국정보통신학회 2018 2016 INTERNATIONAL CONFERENCE Vol.10 No.1
A Wireless Sensor Network is a wirelessly configured sensor node with limited power such as a battery. There are many Wireless Sensor Network Protocols to increase energy efficiency, among which LEACH Protocol and SEP are typical. The LEACH Protocol is mainly used for homogeneous sensor networks with the same initial energy, and SEP is used for heterogeneous sensor networks with different initial energies. In the case of SEP-E, another heterogeneous sensor with different initial energy is added. SEP and SEP-E provide a higher probability of Cluster Head election for node types with more energy than normal nodes. Since the current residual energy of the node is not confirmed, even if the energy is low, the Cluster Head may be elected because of the node type. In this paper, we try to solve these problems.
Lim Daesung,Park Song Yi,Choi Byungho,Kim Sun Hyu,류지호,Kim Yong Hwan,Sung Ae Jin,Bae Byung Kwan,Kim Han Byeol 대한의학회 2021 Journal of Korean medical science Vol.36 No.36
Background: Since the declaration of the coronavirus disease 2019 (COVID-19) pandemic, COVID-19 has affected the responses of emergency medical service (EMS) systems to cases of out-of-hospital cardiac arrest (OHCA). The purpose of this study was to identify the impact of the COVID-19 pandemic on EMS responses to and outcomes of adult OHCA in an area of South Korea. Methods: This was a retrospective observational study of adult OHCA patients attended by EMS providers comparing the EMS responses to and outcomes of adult OHCA during the COVID-19 pandemic to those during the pre-COVID-19 period. Propensity score matching was used to compare the survival rates, and logistic regression analysis was used to assess the impact of the COVID-19 pandemic on the survival of OHCA patients. Results: A total of 891 patients in the pre-COVID-19 group and 1,063 patients in the COVID-19 group were included in the final analysis. During the COVID-19 period, the EMS call time was shifted to a later time period (16:00–24:00, P < 0.001), and the presence of an initial shockable rhythm was increased (pre-COVID-19 vs. COVID-19, 7.97% vs. 11.95%, P = 0.004). The number of tracheal intubations decreased (5.27% vs. 1.22%, P < 0.001), and the use of mechanical chest compression devices (30.53% vs. 44.59%, P < 0.001) and EMS response time (median [quartile 1-quartile 3], 7 [5–10] vs. 8 [6–11], P < 0.001) increased. After propensity score matching, the survival at admission rate (22.52% vs. 18.24%, P = 0.025), survival to discharge rate (7.77% vs. 5.52%, P = 0.056), and favorable neurological outcome (5.97% vs. 3.49%, P < 0.001) decreased. In the propensity score matching analysis of the impact of COVID-19, odds ratios of 0.768 (95% confidence interval [CI], 0.592–0.995) for survival at admission and 0.693 (95% CI, 0.446–1.077) for survival to discharge were found. Conclusion: During the COVID-19 period, there were significant changes in the EMS responses to OHCA. These changes are considered to be partly due to social distancing measures. As a result, the proportion of patients with an initial shockable rhythm in the COVID-19 period was greater than that in the pre-COVID-19 period, but the final survival rate and favorable neurological outcome were lower.
Applying to Optimization Multi-Hop Layered LEACH Routing Protocols in Wireless Sensor Network
Jong-Yong Lee,Daesung Lee 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.11
In this paper, the ML-LEACH routing protocol for the improvement of the performance of in wireless sensor networks is studied. ML-LEACH is derived from LEACH routing protocols. ML-LEACH is a Multi-Hop Layer. ML-LEACH is proposed to compensate for a phenomenon that the energy consumption of the protocols of the sharp drop in the disadvantage of a wide sensor field of LEACH routing protocol. ML-LEACH routing protocol is set upin the environment in accordance with the specific number of Layer and a node in a wireless sensor network and its performance is compared. The simulation MATLAB is used tolet derives the number of Layer and the number of cluster heads.