• 수산해양기술연구
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• 제39권1호
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• pp.77-83
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• 2003

Autonomous mobile robots based on the Web have been already used in public places such as museums. There are many kinds of problems to be solved because of the limitation of Web and the dynamically changing environment. We present a methodology for intelligent mobile robot that demonstrates a certain degree of autonomy in navigation applications. In this paper, we focus on a mobile robot navigator equipped with neuro-fuzzy controller which perceives the environment, make decisions, and take actions. The neuro-fuzzy controller equipped with collision avoidance behavior and target trace behavior enables the mobile robot to navigate in dynamic environment from the start location to goal location. Most telerobotics system workable on the Web have used standard Internet techniques such as HTTP, CGI and Scripting languages. However, for mobile robot navigations, these tools have significant limitations. In our study, C# and ASP.NET are used for both the client and the server side programs because of their interactivity and quick responsibility. Two kinds of simulations are performed to verify our proposed method. Our approach is verified through computer simulations of collision avoidance and target trace.

• 한국정보과학회논문지:정보통신
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• 제28권1호
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• pp.22-36
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• 2001

WWW의 급격한 발전은 몇몇 웹 서버에 큰 과부하를 가져오게 하였다. 이로 인해 고성능 웹서버의 구축이 필요하게 되었는데 그중 프로세스의 오버헤드를 줄이기 위해 도입된 멀티 쓰레드 기법을 이용한 병행 웹 서버들이 많이 이용되게 되었다. 일반적으로 멀티 쓰레드 기법을 이용하는 웹 서버의 구조는 요구 기반 웹 서버 작업 기반 웹 서버 Thread Pool 구조 웹 서버 등으로 나눌수 있다. 본 논문에서는 이런 웹 서버들을 리눅스가 탑재되어 있는 다중 처리기상에 구현하였으며 다양한 환경하에서 성능을 비교 분석하였다 각각의 웹 서버들은 Pthread 라이브러리와 Socket 라이브러리를 이용하여 구현하였으며 여러 파라미터-CPU 개수 CGI 비율, 웹 서버구조, 파일크기 부하량 등-를 조절하면서 실험하였다 실험 결과 분석에 의하면 요구 기반 웹 서버에서는 하나의 CPU에서 수행이 되는 쓰레드의 개수가 많게 되면 성능이 저하되는 것을 볼 수 있었고 작업 기반 웹 서버에서는 단계사이의 불균형으로 인하여 큐에서의 대기 시간이 누적되면 성능이 저하되는 것을 볼수 있었다,. Thread Pool 구조의 웹서버는 쓰레드의 개수가 조절되고 큐에서의 대기 시간 또한 없앰으로 해서 다른 웹 서버에 비해 좋은 성능을 보임을 알 수 있었다. 이와 같은 실험 결과는 다중 처리기를 이용한 고성능 웹 서버를 구축하는데 있어서 이용될 수 있을 것이다.

• 한국결정학회:학술대회논문집
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• 한국결정학회 2003년도 춘계학술연구발표회
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• pp.15-15
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• 2003

To discover new drugs more quickly and more efficiently, pharmaceutical companies and biotechnology firms are increasingly turning to the genomics and the structural proteomics technologies. Structural-proteomics can provide a foundation for this through the determination and analysis for protein structure on a genomics scale. Among many structures determined by CGI, we will present with the representative examples drawn from our work on novel structures or complex structures of the disease-related proteins. The alpha subunit of Hypoxia-inducible factor (HIF) is targeted for degradation under normoxic conditions by an ubiquitin-ligase complex that recognizes a hydroxylated proline residue in HIF. Hydroxylation is catalysed by HIF prolyl 4-hydroxylases (HIFPH) which are fe(II) and 2-oxoglutarate (2-OG) dependent oxygenases. Here, we discuss the first crystal structure of the catalytic domain of HIFPH in complexes, with the Fe(II)/2-OG at 1.8Å. These structures suggest that the Ll region (residues 236-253), which is also conserved in mammals, form a 'lid' that closes over the active site. The structural and mutagenesis analyses allow us to provide a focus for understanding cellular responses to hypoxia and a target for the therapeutic manipulation.

• Asia pacific journal of information systems
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• 제8권2호
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• pp.1-18
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• 1998

As the management and preservation of the environment become an important social issue, information required to support environmental task is required. So, there is an increasing demand for environmental information and appropriate systems to manage it. The vast volume of environmental data is distributed in different knowledge domains and systems. Environmental data objects have the complex structure containing environmental quality data and attribute data. Environmental information systems must be able to address these properties. This research has aimed at constructing well-defined schema design of environmental data, and making system architecture that environmental data kept by authorities should be made available to the public user. There are 3 major components in environmental information systems architecture ; User interface, Catalog libraries, Communication Provider. Web browsers provide consistent and intuitive user interfaces on Internet. The communication provider is a collection of diverse CGI functions. The main roles of the CGIs are to build interfaces between the Web, databases. Catalog libraries is libraries of various matadata including administration matadata. Administration matadata support the environmental administration and the managerial aspects of environmental data rather than explain a database itself or its properties.

• 한국생물물리학회:학술대회논문집
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• 한국생물물리학회 2003년도 정기총회 및 학술발표회
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• pp.28-28
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• 2003

To discover new drugs more quickly and more efficiently, pharmaceutical companies and biotechnology firms are increasingly turning to the genomics and the structural proteomics technologies. Structural-proteomics can provide a foundation for this through the determination and analysis for protein structure on a genomics scale. Among many structures determined by CGI, we will present with the representative examples drawn from our work on novel structures or complex structures of the disease-related proteins. The alpha subunit of Hypoxia-inducible factor (HIF) is targeted for degradation under normoxic conditions by an ubiquitin-ligase complex that recognizes a hydroxylated proline residue in HIF, Hydroxylation is catalysed by HIF prolyl 4-hydroxylases (HIFPH) which are Fe(II) and 2-oxoglutarate (2-OG) dependent oxygenases. Here, we discuss the first crystal structure of the catalytic domain of HIFPH in complexes, with the Fe(II)/2-OG at 1.8 ${\AA}$. These structures suggest that the L1 region (residues 236-253), which is also conserved in mammals, form a ‘lid’ that closes over the active site. The structural and mutagenesis analyses allow us to provide a focus for understanding cellular responses to hypoxia and a target for the therapeutic manipulation.

• 생물정신의학
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• 제14권2호
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• pp.99-105
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• 2007

Objectives : The purpose of present study was to investigate the effect, safety and tolerability of risperdal sachet(oral solution) with lorazepam tablet versus intramuscular haloperidol and lorazepam injection for management of acute psychotic symptom in the elderly with organic mental disorder. Methods : Total 37 patients who have dementia, medical or physical diseases, associated with acute psychotic symptom were randomly assigned to oral treatment with 1mg of risperdal sachet(oral solution) plus 1mg of lorazepam(N=17) or to intramuscular treatment with 2.5mg of haloperidol plus 2mg of lorazepam (N=20). The change of CGI scores was used for the evaluation of efficacy. Results : Mean score improvements at 15, 30, 60, and 120 minutes after treatment were statistically significant at each time point in both groups(p<0.001) and were similar in both groups(p=0.189). Conclusion : A single oral dose of risperdal sachet(oral solution) plus lorazepam was as effective and tolerable as parenterally administered haloperidol plus lorazepam for the rapid control of acute psychotic symptom in the elderly with organic mental disorder.

• 한국정보보호학회:학술대회논문집
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• 한국정보보호학회 2003년도 동계학술대회
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• pp.458-462
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• 2003

기존의 고정적 웹 페이지에, 실시간적으로 변화하는 내용의 제공을 가능하게 하기 위해, 추가적으로 코드를 첨가할 수 있도록 만든 것이 웹 응용 프로그램이다. 그 예로는 cgi, php, jsp, java, python 등이 있다. 많은 수의 언어와 다수의 프로그램들이 빠른 속도로 개발됨에 따라 많은 수의 보안 문제점들이 발생하였고 실제로 대단히 많은 서버들이 침입의 대상이 되었다. 웹 응용 프로그램의 보안에 많은 문제점이 발생한 이유는 첫번째, 기존의 서버 응용 프로그램들에 비하여 웹 응용 프로그램은 휠씬 많은 수가 아주 빠르게 개발되었다는 점이다. 두 번째는 웹 응용 프로그램에서 발생한 새로운 종류의 보안 위험성을 들 수 있다. 기존의 서버 응용 프로그램에서 발생하는 위험성들은 서버프로그램의 버그를 이용한 것이었고, 이들은 외부 입력의 내용보다는 그 크기 등의 간단히 검사 가능한 특징에 의존하는 경우가 많았다. 하지만, 웹 응용 프로그램이 외부 입력의 내용을 코드의 일부로 사용하는 경우가 많음으로 인해서, 웹 응용 프로그램에서는 간단히 검사하기 어려운 특징인 입력의 내용에 의존하는 위험성들이 많이 발생한다. 본 논문에서는 이러한 새로운 방식의 위험성을 소스코드를 이용해서 어떻게 자동적으로 검사할 수 있을 지에 관해서 새로운 아이디어를 제시한다. 이 아이디어는 현재 구현 중에 있으며, 초기 실험 결과 기존의 검사 프로그램들이 찾아내지 못하는 취약점들을 찾아낼 수 있음이 확인되었다.

• 한국산학기술학회논문지
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• 제11권3호
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• pp.991-996
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• 2010

본 논문에서는 IEEE 1284 동작 모드를 사용하는 병렬 I/O 제어 시스템을 제안하고 인터넷 환경하에서 원격제어 통신을 실현하였다. IEEE 1284 표준은 다수의 특정한 동작 모드와 호환성이 있는 인터페이스를 정의하며 PC의 병렬 포트에 대해 보다 개선된 성능을 제공한다. 병렬 포트 장치는 Device/ID 식별 절차를 갖는 병렬 포트에 대해 PnP 기능을 제공하게 되는 새로운 운영체제 때문에 시스템 구성과 인터페이스 절차가 간단하게 된다. 이러한 성능 증대로 병렬 I/O 포트는 더욱 저가격, 실용이 간편한 I/O 포트로 가능하게 된다.

• 동력기계공학회지
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• 제17권4호
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• pp.72-78
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• 2013

Compacted graphite iron 340 was carried out the heat treatment from 873 to 1,273 K. Compacted graphite iron 340 was evaluated relationship between the sound velocity, the attenuation coefficient and the tensile strength. The obtained results are as following. The signal strength of C scan images were weak according to increasing of heat treatment temperature and time. The amplitude of A scan and B scan was also low. This can be cause that the graphite was grown into the type of vermicular, and the many of grain boundary with ultrasound scattering were increase. The sound velocity was depend upon the heat treatment temperature and time, the attenuation coefficient had nothing to do with the temperature and time. The higher the heat treatment temperature, the tensile strength and the sound velocity were decreased. However, the tensile strength was proportional to the sound velocity. The higher tensile strength, the faster the sound velocity.

• 한국멀티미디어학회논문지
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• 제22권6호
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• pp.716-728
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• 2019

This study explores the concept of spectacular realism. and finds out how spectacular realism is made in movies. The Movies's spectacle is a realistic spectacle that does not miss the reality. so audiences can immerse themselves in it. Nowadays the spectrum of visual realism is becoming very diverse. "Perceptual realism" means to feel more like real than to reproduce reality as it is. "Synthetic realism" is a realism that CGI makes. And "Spectacular realism" makes the spectators concentrate to images than narrative or character. It means the dominance of the visual. The films and showed "Spectacular realism" especially in the aerial battle scenes. The films use 'Presentation of a new spatial sensation using unusual angles', 'Editing that constitutes transcendental time' and 'Intense contrast' as methods to embody spectacular realism. And the harmonious arrangement of transcendental images and very realistic screens effectively embodies Spectacular Realism. This discussion, which began in the air battle scene, could contribute to a broader and more diverse exploration of the implementation of spectacular realism images in the future.