• Journal of Korean Academy of Oral and Maxillofacial Radiology
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• v.29 no.1
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• pp.255-260
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• 1999

Purpose: The objective of this study was to evaluate the possibility of substitution of the zonography for the full-mouth periapical radiography in aspect of radiation protection. Materials and Methods: Rando phantom and LiF TLD chips were used for dosimetry. The absorbed doses at brain, skin above the TMJ. parotid gland. bone marrow in the mandibular body. and thyroid gland during the full-mouth periapical radiography. panoramic radiography. and zonography were measured. Resul ts: From the zonography. the absorbed doses to the brain. the skin over the TMJ. and the parotid gland were relatively high. but the absorbed doses to the bone marrow in the mandibular body and. especially. the thyroid gland were very low. Conclusion: The zonography can be an alternative to the full-mouth periapical radiography in aspect of radiation protection.

• Proceedings of the KIEE Conference
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• 1988.07a
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• pp.492-496
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• 1988

As computer systems get complex more and more, the powerful but easy-to-use man machine interfaces are required. This paper describes the man machine interface in the TDX-10 switching system currently being developed at ETRI. The man machine interface in TDX-10 provides a reliable and user-friendly system interface through which system operators can manage the system in a convenient way. It incorporates the window, menu, form, on-line help, history recording, command file batching and color graphics capabilities.

• Journal of the Korea Safety Management & Science
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• v.9 no.6
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• pp.69-79
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• 2007

Corporations are faced with the key strategic task of adopting a comprehensive management system of a new paradigm in order to enhance their products' quality, safety, and reliability, as well as to minimize the cost of quality. The purpose of this paper is to present a methodology that can be used by corporations to ensure a product's reliability, safety, and maintainability, with minimal costs, by measuring dependability levels and conducting DEA analysis. The methodology will be a way for corporations to adopt an optimal dependability management system based on a quality management system of ISO 9001:2000 standards.

• Proceedings of the Safety Management and Science Conference
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• 2006.11a
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• pp.207-221
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• 2006

Corporations are faced with the key strategic task of adopting a comprehensive management system of a new paradigm in order to enhance their products' quality, safety, and reliability, as well as to minimize the cost of quality. The purpose of this paper is to present a methodology that can be used by corporations to ensure a product's reliability, safety, and maintainability, with minimal costs, by measuring dependability levels and conducting DEA analysis. The methodology will be a way for corporations to adopt an optimal dependability management system based on a quality management system of ISO 9001:2000 standards.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.19 no.12
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• pp.2448-2457
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• 1994

CCITT recommendation X.25 and X.75 have been applied to the PSPDN environment for data communication of packet switching. They have also been used for packet switching in the ISDN exchanges since about the year 1980. This paper presents the throughput of the TDX-10 packet handler as simulating the performance based on memory management and flow control of the resource management algorithm designed originally.

• Journal of the Korea Safety Management & Science
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• v.12 no.2
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• pp.25-33
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• 2010

Nowadays worldwide leading companies try to establish more efficient and comprehensive management system for getting high quality, reliability and safety. In this paper, we investigate standards for quality management, dependability management and risk management. We also suggest an integrated and comprehensive system of quality(ISO/TS16949), dependability (IEC60300)and risk(JIS Q2001). The evaluation method on the performance of dependability management systems are developed and applied for the semiconductor equipment company.

• Electronics and Telecommunications Trends
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• v.8 no.1
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• pp.45-68
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• 1993

1970년대 들어서 소프트웨어 공학의 위기론이 대두되었다. 그 이유는 기존의 구조적 프로그래밍(Structured Programming) 기법만으로는 소프트웨어의 유지보수와 기존 소프트웨어의 재사용이 어렵다는 문제점 때문이었다. 따라서, 이의 해결책으로서 새로운 방식인 객체지향 프로그래밍(Object-Oriented Pro-gramming) 개념을 도입하여 해결하고자 노력하고 있다. 이에 따라 최근 통신분야의 소프트웨어 개발환경에서도 객체지향 패러다임의 도입을 시도하고 있다. 객체지향 통신 프로그래밍 언어 개발의 준비 작업으로서, 본 논문에서는 객체지향 프로그래밍 패러다임의 기본적인 개념과 언어 설계에 대한 연구들을 조사하여 정리하였다.

• Journal of Institute of Control, Robotics and Systems
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• v.9 no.7
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• pp.489-497
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• 2003

A water management system is developed to reduce the unit cost of production in wide-area waterworks. Improving productivity in waterworks is to save power rate. We suggest a method to schedule the supply of water according to the time-varying power rate and pump control scheme. Water pipeline analysis package (SynerGEE Water) is utilized to obtain optimal pump control solution adaptation to water demand. Our evaluation results show that developed scheme is more efficient than the conventional.

• Proceedings of the KIEE Conference
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• 1993.07a
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• pp.473-475
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• 1993

Premium Service is the next service to be developed after the Freephone Service and Credit Call Service which has currently been developed and is being now tested. Premium Service is a service which provide information on a telephone line. The calls are charged with a special rate which includes service and call charge. Public telecommunication operator performs charging and accounting from the service user for the service provider and for every service provided subtracts the commission from the part of service revenue and gives the rest back to the service provider. This paper is about the study on the implementation of the Premium Service in the Service Switching Point.

• Journal of KIISE:Computer Systems and Theory
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• v.26 no.4
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• pp.513-526
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• 1999

3 차원 입체 형상을 표현하기 위한 수단으로서 도면을 사용하는 방법이 생산현장에서 많이 활용되고 있다. 그러나 이 방법은 정투영 과정에서 정보 손실이 발생하기 때문에 3차원 후보 요소의 빈번한 조합 탐색 및 복잡한 기하 연산을 필요로 한다. 특히 , 이면도로부터 복원과정은 면도의 생략으로 인하여 수많은 허요소를 생성한다. 본 논문은 효율적인 허요소 축소를 통하여 이면도로부터 다면체를 바르게 복원하는 이단계 알고리즘을 제안한다. 1 단계에서는 이면도와의 정합성에 필수적인 최소한의 3차원 후보요소를 생성한후 , 정투영시 이면도와 일치하는 부분 물체를 복원한다. 2단계에서는 부분 물체에 직교면을 덧붙임으로써 기하학적으로 타당한 완전 물체를 복원한다. 실험결과를 통하여 제안방법이 기존 방법들에 비해 적은 수의 3차원 후보 요소를 생성시키면서 이면도로로부터 3차원 물체를 빠르게 생성하는 것을 보인다.