• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 Ⅳ
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• pp.2411-2414
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• 2003

In this paper, we present a digital image authentication using semi-fragile watermarking techniques. The algorithm is robust to innocuous manipulations while detecting malicious manipulations. Specifically, the proposed method is designed for the purpose of the real time authentication of an image frame captured from a digital camera due to its easy H/W implementation, security and visible verification. To achieve the semi-fragile characteristics that survive a certain amount of compression, we employ the invariant property of DCT coefficients' quantization proposed by Lin and Chang [1]. The binary watermark bits are generated by exclusive ORing the binary logo with pseudo random binary sequences. Then watermark bits are embedded into the LSBs of pre-quantized DCT coefficients in the medium frequency range. Verification is carried out easily due to visually recognizable pattern of the logo extracted by exclusive ORing the LSBs of the embedded DCT coefficient with pseudo random number seeded by a secret key. By the experiment results, this method is not only robust to JPEG compression but also it detects powerfully alterations of the original image, such as the tempering of images.

• 전자공학회논문지SC
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• 제38권2호
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• pp.50-55
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• 2001

저 전력을 소모하는 새로운 방식의 논리회로를 설계하여 이의 성능실험을 위해 패리티체커를 구성하여 시뮬레이션 하였다. 기존의 저전력 소모용으로 설계된 논리회로(CPL, DPL, CCPL 등)들은 패스 트랜지스터를 통과하면서 약해진 신호를 풀 스윙 시키기 위해서 인버터를 사용하는데, 이 인버터가 전력소모의 주원인이 되고 있음이 본 논문에서 시뮬레이션 결과 밝혀졌다. 따라서 본 본문에서는 인버터를 사용하지 않고 신호를 풀스윙 시킬 수 있는 회로를 고안하였다. 기존의 CCPL게이트로 구성한 패리티체커에 비해 본 논문에서 제안한 게이트로 구성된 것이 33%의 전력을 적게 소모하는 것으로 시뮬레이션 결과 나타났다.

• 한국통신학회논문지
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• 제12권4호
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• pp.347-356
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• 1987

本 論文에서는 高速 光 디지털 傳送시스템과 같은 高速 unipolar 信號 傳送시스템에 適合한 새로운 mBIZ 傳送路符號를 提案하였다. mBIZ符號는 情報信號系列 傳送速度를 $\frac{(m+1)}{m}$ 만큼 速度變換한 後 m 비트마다 補助 서어비스 비트 하나를 揷入한 信號系列과 出力傳送路符號系列의 한 비트를 遲延시킨 信號系列을 Exclusive NOR하여 符號化하기 때문에 redundancy를 줄일 수 있을 뿐만 아니라 復號回路 역시 간단하게 構成할 수 있다. mBIZ符號는 回符號連積數를 (m+1)비트 이내로 抑壓할 수 있으며 傳送路符號系列의 마크率이 1/2이기 때문에 電力 스펙트럼에 存在하는 高低周波 成分들을 抑壓할 수 있다.

• 한국실내디자인학회논문집
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• 제25권4호
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• pp.113-124
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• 2016

This research examines domestic and oversea's barrier-free design guidelines provided exclusively for children and their implementations in the common spaces of the outpatient clinics in two pediatric rehabilitation hospitals in Seoul. Based on literature review, a checklist was developed to compare various barrier-free design guidelines in consideration of children's accessibility in space. In addition, four spatial areas in the outpatient clinics of the two hospitals were investigated based on the checklist. As a result, the domestic and Japanese guidelines were aiming primarily to all user groups regardless of ages. Whereas in other oversea's guidelines, a number of barrier-free design standards exclusive for children were found in the facility items such as handrail, sink, urine, toilet, water fountain, chair, table, shelve, and so on, throughout the indoor waiting and sanitary spaces. Concerning implementations, most of the items in the indoor passage, waiting, and sanitary spaces of the two hospitals were not sufficiently facilitated enough to meet with the barrier-free design standards exclusive for children. As such, it is recommended to review and improve the current domestic barrier-free design guideline to accommodate various physical and spatial needs of children in all age groups and regardless of disability types, in the design of a pediatric rehabilitation hospital in the future.

• Ocean and Polar Research
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• 제32권4호
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• pp.475-482
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• 2010

Hydrothermal deposits on deep-sea floors are expected to provide potential metal resources for future demands. Korea was recently granted a prospecting licence to undertake exploration for hydrothermal metal deposits in the exclusive economic zone (EEZ) of the Kingdom of Tonga in the Pacific Ocean. The Korean Deep Seabed Mining Group (KDSMG), which consists of four Korean companies involved in marine technologies, oil and gas shipping, and smelter industries, has conducted research to evaluate the region's resource potential in cooperation with the Ministry of Land, Transport and Maritime Affairs (MLTM) of Korea. Here we present and reflect on the exploration results of these companies and their strategic plans. We also evaluate Research and Development (R&D) progress for the commercial development of seafloor hydrothermal deposits. Our own strategies and prospects for the commercial development of this potential resource are also outlined. We do acknowledge that other potentially important information regarding the amount of ore body, the inside structure, and the metal yields have not yet been clarified sufficiently. As such it is necessary to address these problems through experimental R&D and surveys.

• 수산해양기술연구
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• 제53권4호
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• pp.437-445
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• 2017

Distribution and composition of the seabed litters in the exclusive economic zone of the West Sea of South Korea including 18 sea-blocks were investigated using a bottom trawl gear of the R/V Tamgtu 20 (National Institute of Fisheries Science) from 24th April 2011 to 4th May 2012. Each trawl shot was conducted for an hour in each sea-block and the total trawl shots was 18. As a result, 325.6 kg of seabed litter in total has been collected. The quantity of the seabed litter was highest at No. 202 of the sea-block, close to the Heuksan-Do. The highest occupied sea material was plastic (83.1% of entire seabed litters), the second highest material was metal combined with plastic (10.6%), and glass (2.9%), metals (2.3%), vinyl (0.6%), cloth (0.4%) and wood (0.2%) in order. The origin of seabed litters was from fishing gear (89.0% of all seabed litters). Therefore, it could be assumed that most seabed litters were derived from the fishing activity for example fishing nets and ropes.

• 대한안전경영과학회지
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• 제15권2호
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• pp.47-53
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• 2013

This study is aimed to investigate the occupational safety and health management of contractor company in the car industry. The questionnaire survey was conducted on the suppliers and contractors of car industry. Data were collected from 10 contractor companies and their 291 contractor companies(each outside and inside company). From the survey result, it was found that the level of all-round safety and health management is above the average. To strengthen the relationship for safety and health management, it is needed that the supplier company employ the person in exclusive charge to support contractor. Also it is needed the active support of the contractor company and needed that the supplier company employ the person in exclusive charge to support contractor. Finally, Many of the problems associated with the safety and health management by strengthening contractor company responsibility will have to be solved simultaneously.

• 한국도로학회논문집
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• 제15권2호
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• pp.131-138
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• 2013

PURPOSES : The intents of the study are to identify the accident factors and to demonstrate the potentials of tobit model as a tool to study the number of accidents on arterial roads segments. METHODS : This paper uses a tobit regression as a methodology to analyze the factors affecting the number of accidents. In pursuing the above goal, this study gives particular attentions to analyzing the data of 2,446 accidents (1,610 in major arterial roads and 836 in minor arterial roads) occurred on arterial roads in 2007 to 2010. RESULTS : First, 3 accident models which were classified by total arterial roads, major arterial roads and minor arterial roads, and were all statistically significant were developed. Second, the exclusive right-turn lane as common variable, and the number of accident, traffic volume, number of lanes, link length, rate of median, number of entrances, number of pedestrian crossings, number of curves, number of bus stops and exclusive left-turn as specific variables of the models were selected. Finally, the paired sample t-test could not be rejected the null hypotheses of three types of models. CONCLUSIONS : Using data from vehicle accidents on arterial roads, the estimation results show that many factors related to roadway geometrics and traffic characteristics significantly affect to the number of accidents.

• World Technopolis Review
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• 제8권2호
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• pp.120-134
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• 2019

The main objective of this study was to investigate the customer's satisfaction level with the digital relationship model of Banco do Brasil Exclusive Business Offices situated in Rio Grande do Sul. Banco do Brasil is one of the largest Brazilian and global financial institutions and conducted a restructuring customer's relationship model since 2015, creating new specific service structures for certain segments, among them exclusive offices. This research had a qualitative step with an internal documentary analysis about the company and a semi-structured interview with manager's offices, in order to check the strategy and the foundations of business model, as well as identify perceptions and the difficulties in implementing this new structure. The quantitative step held the findings about customer satisfaction level in relation to the quality of services provided by offices, through an electronic survey based on the Servqual Scale developed by Parasuraman et al. (1988), which measures the difference between customer's expectations and perception in five dimensions: tangibility, reliability, understanding, safety and empathy. The results shown that Banco do Brasil customers' are satisfied with services offered through the digital model and the new business structure, in which is offered a humanized service together with the best technology. It was found, also, that digital probably would not replace the physical world, but they complement one another. Digital offices and physical agencies will coexist, improving value proposition delivery and better customers experience, satisfy them and build their loyalty.

• 한국정보과학회논문지:시스템및이론
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• 제32권10호
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• pp.507-511
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• 2005

유한체 GF(p)에서 r=2p+1이 2-솟수이고, p에 대한 2의 위수 m을 가질 때, $q=r^e,\;(e{\geq}2)$를 연결정수로 갖는 FCSR의 생성된 출력 수열에 대한 선형복잡도를 구한다. 또한, 합산 난수 발생기(Summation Generator)는 LFSR의 출력 수열을 정수 합산하여 키 수열을 발생한다. 이와 유사하게 두개의 FCSR의 출력 수열을 상관관계에 안전한 비트별 논리합(bitwise exclusive-oring)을 이용한 이진 난수열 발생기를 제안하고, 선형복잡도 측면에서 출력된 수열의 암호학적 특성을 살펴본다