• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 하계종합학술대회 논문집(4)
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• pp.319-322
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• 2002

In this paper, we present a digital authentication technique using content-based watermarking in digital images. To digest the image contents, Hopfield network is employed on the block-based edge image. The Hopfield function extracts the same tit fur similarly looking blocks so that the values are unlikely to change to the innocuous manipulations while being changed far malicious manipulations. By inputting the extracted bit sequence with secret key to the cryptographic hash function, we generate a watermark for each block by seeding a pseudo random number generator with a hash output Therefore, the proposed authentication technique can distinguish between malicious attacks and innocuous attacks. Watermark embedding is based on the block-based spread spectrum method in DCT domain and the strength of watermark is adjusted according to the local statistics of DCT coefficients in a zig-zag scan line in AC subband. The numerical experiments show that the proposed technique is very efficient in the performance of robust authentication.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.2076-2077
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• 2007

To find out abnormal electrical conditions, periodic inspections for residential houses are being performed every 3 years. According to data from KESCO, the number of uninspected houses is rising as the number of empty houses during normal working hours is rising by dramatic increase in the number of nuclear families and double income families. As a result, potential hazards are increased by them. In this paper, a model of a national electric safety network is presented. In the model, functions for ubiquitous environments were partially realized.

• BMB Reports
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• 제29권3호
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• pp.266-271
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• 1996

A recombinant human erythropoietin (EPO), expressed in Chinese hamster ovary (CHO) cells, is glycosylated at Asn 24, Asn 38, Asn 83, and Ser 126. After release of the N-linked carbohydrate chains by $peptide-N^{4}-(N-acetyl-{\beta}-glucosaminyl)$ asparagine amidase F, the oligosaccharides were analyzed by FACE (Fluorophore-Assisted Carbohydrate Electrophoresis). The O-linked carbohydrate chain was separated by hydrazine, and analyzed by FACE. The monosacccharide composition of recombinant EPO showed man nose, fucose, galactose, N-acetylglucosamine, N-acetylneuraminic acid, and a trace of N-acetylgalactosamine, which are typical monosaccharides in the glycoproteins from the CHO cell. Sequences of N-linked and O-linked oligosaccharides were determined. The structure and composition of oligosaccharides attached to recombinant human EPO, expressed in the CHO cell, are identical to the reported oligosaccharide structure in human EPO isolated from urine.

• 전자공학회논문지 IE
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• 제43권1호
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• pp.32-38
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• 2006

유도전동기는 기동 시 전류가 정격전류의 6$\sim$8배에 이르기 때문에 경 부하로 운전하는 경우에는 역률을 떨어뜨릴 뿐만 아니라 과다한 기동전류로 인해 계통전원에 순간전압 강하를 유발시켜 선로의 전력품질저하가 심각하게 대두되고 있다. 본 논문에서는 PSCAD/EMTDC 패키지를 이용하여 IEEE에서 제시한 배전 계통 13버스 모형 모델 및 유도기 부하를 모델링 하여 사고모의 및 DSTATCOM의 보상효과를 시뮬레이션을 통하여 보였다.

• 한국해양공학회지
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• 제21권3호
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• pp.65-70
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• 2007

There are many kinds of protection methods for marine structures, with varyingeconomical and environmental advantages. The coating protection method is being widely used in both continental and marine structures. In this study, by adding some additives, such as Zn powder(Zn), carbon black(CB) to epoxy anti-corrosive paint, the effect on the corrosion resistance was investigated throughan electrochemical method. The additive of Zn(20)+CB(10) showed the lowest passivity current density. Polarization resistance in both cyclic voltammogram and impedance measurement of an additive of Zn(20)+CB(10) was also the largest value, compared to other additives. Furthermore, rusting and bubbling was not observed on the surface of the test specimen with the additive of Zn(20)+CB(10), compared to other specimens. It is suggested that the corrosion resistance of the anti-corrosive paint can be improved by using some additives.

• 한국보건간호학회지
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• 제12권1호
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• pp.1-12
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• 1998

This study was conducted to grasp the progress of the health management program in small scale industries with phenomenological approach. The industrial health care system compose of manpower, devices, and facilities such as medical resources, organization, service delivery system, financial resources, payments, and management system is important for the industrial health. Especially health management program should be provided feasible conditions to workers. The data collection period was 2 months from September 1 to October 30, 1997. The indepth interview results for health monitor, labors, and occupational health nurses were analyzed by Giorgis' phenomenological method. The major results were as follows: 1. The workers, health monitors and nurses felt that the subsidiary program of health management in small scale industries were necessary. This project for small-size industry can be set-up through complementary education for health monitors and resolvement of nurses' six suggestions. It is necessary to provide followings ; 1) Properly devision of industry 2) More clear guidance for health management at visiting time 3) Legitimate incentive system 4) Health education materials and devices 5) Change of fee and material payments at visiting 6) Budgets and system for medication and vaccination at visiting 2. Above all, it is suggested that the strategics of the health management program should be developed.

• 분석과학
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• 제12권6호
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• pp.571-576
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• 1999

소변 시료에서 비스테로이드성 소염진통제 (Non-Steroidal Anti-Inflammatory Drugs)인 Fenamates 부류의 6종에 대해서 pentafluoropropionyl 유도체화 반응을 통하여 Gas Chromatograph/Negative Chemical Ionization-Mass Spectrometer에 감응도가 높은 유도체를 만들었다. 6종의 소염 진통제 약물에 대하여 반응성이 좋은 유도체화 반응 조건과 크로마토그래피 조건을 설정하였으며 이들 약물은 동시에 분석 가능하였고 검출한계가 4-25 pg/mL 이어서 경마 경기에서 자주 사용되고 있는 NSAIDs의 미량 성분에 대한 검출 및 법과학에서의 응용이 가능하다.

• Journal of the Korean Data and Information Science Society
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• 제7권2호
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• pp.235-245
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• 1996

확률변수 (X,Y)가 이변량 정규분포를 따르는 경우, 모상관계수 ${\rho}$에 관한 여러 가설들 중에서 $H_{0}:{\rho}={\rho}_{0}$인 경우에는 알려진 분포를 이용한 통계적 추론을 하기가 어렵다. 이러한 경우 Fisher에 의해 제안된 Z-변환을 이용한 근사적 검정법이 사용되어 오고 있으나 근사적인 방법이기 때문에 주어진 표본의 크기가 충분히 많지 않은 경우에는 적용에 무리가 있을 수 있다. 그래서 본 논문에서는 먼저 표본 상관계수 R의 분포를 모의실험을 통하여 직접 구하여 검정한 정확 검정법과, 붙스트랩(bootstrap) 방법을 이용하여 구한 붙스트랩 검정법을 제시하고, Fisher의 방법의 효율성과 실제성을 검토하고 제시된 방법들과 서로 비교하고자 한다.

• Journal of Preventive Medicine and Public Health
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• 제36권2호
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• pp.108-116
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• 2003

Objective : To determine the relationships between customer's attitude, the subjective norm and the intention to use hospital-based health promotion services. Methods : This study was based on the theory of reasoned action, suggested by Fishbein and Ajzen. The subjects of this study were 501 residents of Seoul, Bun-dang, Il-san and Pyung-chon city, under 65 years, who were stratified by sex and age. A covariance structural analysis was used to identify the structural relationships between attitude towards health promotion programs or services, their subjective norm and their intention to use the aforementioned services. Results : The subjective norm for using the health promotion programs or services provided by hospitals was a significant predictor of the intention to use, but the attitude towards the services was not significant Conclusions : Our results suggest that a customer's reference group affects their use of the hospital-based health promotion services. Because the subjects of this study were restricted to specific urban areas, there are limitations to generalizing the study results. Despite the limitations of these results, they can serve as baseline information for the understanding of consumers behavior toward hospital-based health promotion services.

• International Journal of Naval Architecture and Ocean Engineering
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• 제5권1호
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• pp.1-20
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• 2013

In the present paper, the sloshing resistance performance of a huge-size LNG carrier's insulation system is evaluated by the fluid-structure interaction (FSI) analysis. To do this, the global-local analysis which is based on the arbitrary Lagrangian-Eulerian (ALE) method is adopted to accurately calculate the structural behavior induced by internal LNG sloshing of a KC-1 type LNG carrier insulation system. During the global analysis, the sloshing flow and hydrodynamic pressure of internal LNG are analyzed by postulating the flexible insulation system as a rigid body. In addition, during the local analysis, the local hydroelastic response of the LNG carrier insulation system is computed by solving the local hydroelastic model where the entire and flexible insulation system is adopted and the numerical analysis results of the global analysis such as initial and boundary conditions are implemented into the local finite element model. The proposed novel analysis techniques can potentially be used to evaluate the structural integrity of LNG carrier insulation systems.