• Journal of the Korea Institute of Information Security & Cryptology
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• v.31 no.6
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• pp.1149-1156
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• 2021

The Grover algorithm, which accelerates the brute force attack, is applicable to key recovery of symmetric key cryptography, and NIST uses the Grover attack cost for symmetric key cryptography to estimate the post-quantum security strength. In this paper, we estimate the attack cost of Grover's algorithm by implementing DES as a quantum circuit. NIST estimates the post-quantum security strength based on the attack cost of AES for symmetric key cryptography using 128, 192, and 256-bit keys. The estimated attack cost for DES can be analyzed to see how resistant DES is to attacks from quantum computers. Currently, since there is no post-quantum security index for symmetric key ciphers using 64-bit keys, the Grover attack cost for DES using 64-bit keys estimated in this paper can be used as a standard. ProjectQ, a quantum programming tool, was used to analyze the suitability and attack cost of the quantum circuit implementation of the proposed DES.

• Journal of Korea Water Resources Association
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• v.56 no.1
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• pp.45-52
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• 2023

Due to natural disasters such as heavy rain that occurred in the metropolitan area in August 2022, human casualties and property damage are increasing. Accordingly, the government is making efforts to respond to natural disasters, but due to the absence of related standards and standardized standards, problems such as increased construction costs and deterioration in construction quality for disaster prevention facility maintenance projects are occurring. Accordingly, a rough construction cost estimation module was developed and applied to 25 new pumping stations in Korea. As a result of the analysis, the accuracy of the rough construction cost derived through the module recorded 70% of the detailed design cost, which is 4% higher than the previously used rough construction cost accuracy of 66% by the Ministry of Environment. Accordingly, it is expected that the efficiency of the disaster prevention project can be increased if the developed module is used to calculate the rough construction cost for storm and flood disaster prevention in the future.

• Journal of the Korea Society of Computer and Information
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• v.17 no.10
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• pp.203-216
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• 2012

For the successful operation of the current organization, the importance of the information system is further increasing, and audit for the information system construction is also spreading according to the mandatory of information system audit. However our country's information system audit still does not deal with various risks and the improvement plan of it is desperately needed since bad practices are often happened while performing audit for the various information system projects. Therefore, this paper proposed improved review items for the quality improvement of information system construction by analysing data of information system audit projects and risk occurrence projects that are performed by the domestic large SI company during four years. In addition, this paper verified the effectiveness of the improved review items proposed in this paper by applying them to actual information system project examples.

• Journal of Environmental Science International
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• v.25 no.10
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• pp.1381-1387
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• 2016

This study aims to establish baseline data for sustainable monitoring by applying the green city index (GCI), which is set up to evaluate the city level, to the city of Gangneung-si, which was designated as a pilot city for the Low-carbon Green Growth City project by the Ministry of Land, Infrastructure, and Transportation. The GCI was applied in the framework of European systems, while considering the social and economic status of Korea. Indicators from 7 areas-$CO_2$, energy, building, transportation, water, waste, and quality of atmosphere were analyzed, except for qualitative indicators. Results indicate that total $CO_2$ emissions were 30.8 tons per capita, or 2.2 tons per one million units of real GDP. The total final energy consumption was 0.231 TOE/capita, or 0.317 TOE per one million units of real GDP. The percentage of total energy derived from renewable resources was 0.41% and energy consumption by the building was $433.5Mwh/1,000m^2$. The total percentage of the working population travelling to work daily by public transportation (limited to bus) was 19%. Further, the total annual water consumption was $99m^3/capita$, and the water lost in the water distribution system was $0.057m^3/capita/day$. The total annual waste collected was 0.0077 ton per capita, The annual mean emission were 0.014 ppm/day for $NO_2$, 0.005 ppm/day for $SO_2$, and 0.019 ppm/day for $O_3$. The annual mean for PM10 emissions was $39{\mu}g/m^3/day$.

• Journal of Periodontal and Implant Science
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• v.53 no.3
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• pp.233-244
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• 2023

Purpose: An implant-supported prosthesis consists of an implant fixture, an abutment, an internal screw that connects the abutment to the implant fixture, and the upper prosthesis. Numerous studies have investigated the microorganisms present on the implant surface, surrounding tissues, and the subgingival microflora associated with peri-implantitis. However, there is limited information regarding the microbiome within the internal screw space. In this study, microbial samples were collected from the supragingival surfaces of natural teeth, the peri-implant sulcus, and the implant-abutment screw hole, in order to characterize the microbiome of the internal screw space in healthy subjects. Methods: Samples were obtained from the supragingival region of natural teeth, the peri-implant sulcus, and the implant screw hole in 20 healthy subjects. DNA was extracted, and the V3-V4 region of the 16S ribosomal RNA was sequenced for microbiome analysis. Alpha diversity, beta diversity, linear discriminant analysis effect size (LEfSe), and network analysis were employed to compare the characteristics of the microbiomes. Results: We observed significant differences in beta diversity among the samples. Upon analyzing the significant taxa using LEfSe, the microbial composition of the implant-abutment screw hole's microbiome was found to be similar to that of the other sampling sites' microbiomes. Moreover, the microbiome network analysis revealed a unique network complexity in samples obtained from the implant screw hole compared to those from the other sampling sites. Conclusions: The bacterial composition of the biofilm collected from the implant-abutment screw hole exhibited significant differences compared to the supra-structure of the implant. Therefore, long-term monitoring and management of not only the peri-implant tissue but also the implant screw are necessary.

• The Journal of Korean Obstetrics and Gynecology
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• v.37 no.1
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• pp.89-103
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• 2024

Objectives: This study analyzed an online survey targeting women and Korean medicine doctors who participated in the Yeosu City Postpartum Health Center Support Project. Through this, we would like to discuss the direction of support for postpartum health care support projects and new policies to encourage childbirth. Methods: In this study, we examined the results of an online survey from 73 women and 29 Korean medicine doctors. We examined 39 items, including basic information, childbirth-related items, Korean medicine treatment-related items, business satisfaction, and policies, answered by 73 women and 29 Korean medicine doctors who responded to the online survey. Results: The average age of women was 33.62±4.19 years, and the average age of Korean medicine doctors was 49.82±8.60 years. Musculoskeletal pain appeared most commonly in both maternal and Korean medicine doctors' online surveys. The visit date from the date of delivery was 36.87±27.06 days. Gungguijohyeol-um and Boheo-tang were widely used. The survey score of women whose main symptoms improved after taking herbal medicine was 3.04±1.15 points, and the survey score of Korean medical doctors was 4.13±0.74 points. The positive response to the policy was 73.7% for satisfaction with the overall policy to encourage childbirth, 54.8% for perceived support, and 65.7% for reduction of economic burden. Conclusions: Women who participated in the postpartum health care support project and received Korean medicine treatment and Korean medicine doctors who performed Korean medicine treatment were very satisfied. The most frequent postpartum symptom was musculoskeletal pain. The degree of improvement in main symptoms after taking herbal medicine was higher among Korean medicine doctors than among women. Among childbirth policies, the areas that should be prioritized are childbirth support projects and postpartum care projects.

• Korean Journal of Soil Science and Fertilizer
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• v.1 no.1
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• pp.1-5
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• 1968

A low yielding paddy soil was water logged at $30{\pm}2^{\circ}C$ with soluble starch as a easily decomposable organic matter for 3 weeks in the laboratory. The relation of pH and Eh changes and soluble iron, manganese and silica was investigated. The experimental results obtained were summarized as follows; 1. When organic matter was applied, reduction of the soil was severer, that is, Eh value was lower by 200 mv. for a week in the beginning of submergence. 2. pH of the untreated soil was dropped a little just after submergence, and then gradually increased to 60. When treated, pH was increased due to abrupt drop of Eh in the beginning but decreased to 4.5 after a week, and became constant at this pH value. 3. Slight increase in soluble iron, manganese and silica was observed in the untreated soil whereas soluble iron, manganese and silica in the treated soil were increased about 20, 10, and 3 times, respectively. 4. When soluble starch was treated, pH and soluble silica or manganese was highly correlated[($H^+$) and Mn ${\gamma}=0.734^{**}$, ($H^+$) and $SiO_2$ ${\gamma}=0.923^{**}$] and below pH 5.0, release of these element was rapidly increased.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.484-485
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• 2011

Since the year 2008, the first demonstration project of the superconducting cable for the KEPCO grid operation has been in progress. To apply the HTS (High Temperature Superconducting) cable system into the commercial network, a new test complex was built in the 154kV Icheon substation and the on site assembly of 22.9kV, 50MVA HTS cable with the cryogenic refrigeration system was finished. A full scale of HTS cable fabricated with 2nd generation wire is to be in service in KEPCO network. In this paper, a series of processes of the installation and operation test are introduced.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.555-556
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• 2011

오늘날 전기는 물과 같이 일상생활에 없어서는 안 될 생활 필수품이다. 특히 21세기는 IT, 디지털, 초정밀 산업의 시대로 순간정전에도 민감하게 반응하는 고품질의 전력이 요구되는 시대이다. KEPCO는 세계 최고 수준의 전기품질과 저렴한 요금으로 모든 국민에게 안정적으로 전력을 공급해야 하는 막중한 책임이 있다. 따라서 고품질의 전력을 주요 수요지로 수송하기 위한 송전선로와 변전소의 적기 건설을 위한 효율적이고 체계적인 프로젝트관리 중요성이 대두되었으며, KEPCO는 경영의 투명성을 제고하고 회사내부의 자원 및 업무 프로세스를 통합관리하고자 도입한 전사적자원관리(Enterprise Resource Planning; ERP) 시스템내에 송변전 건설 프로젝트 시스템(PS)을 구축함으로써 송변전건설 프로젝트 관리업무를 ERP라는 통합된 환경에서 수행할 수 있게 되었다. 그러나 최근 생활수준의 향상에 따른 송변전 건설관련 민원과 각종 건설규제 법률 강화 등으로 보다 효율적이고 통제 가능한 송변전설비 건설프로젝트 관리의 필요성에 대한 요구가 지속적으로 제기되었다. 이에 본 논문에서는 KEPCO의 효율적인 송변전 건설사업 공정관리를 위한 ICT기반의 건설 프로젝트 관리 방안에 대해 살펴보고자 한다.

• Journal of Sensor Science and Technology
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• v.17 no.3
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• pp.210-216
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• 2008

The propose of this study is evaluating which correlation of foot pressure distribution and scoliosis that happen by walking to 20'th Mens that have not experienced a scoliosis. The propose of this study is evaluating which correlation of foot pressure distribution and scoliosis that happen by walking to 20'th Mens that have not experienced a scoliosis. Measurement and analysis of Foot Pressure was executed by using by F-scan System. Degree of scoliosis was expressed as a angle used x-ray image of 5-lumbar from 4-thoracic vertebra The correlation between result of foot pressure and degree of scoliosis was evaluated under 0.05 interrelationship, and variables used for analysis were showed high correlation.