디지탈 시스팀 合成을 위한 設計費用과 動作速度 豫測

李近萬,李明浩,이재기 청주대학교 산업과학연구소 1989 産業科學硏究 Vol.7 No.-

In this paper, The implementation of Design Space Explorer which is one of the synthesis tools in AHS(An Automatic Hardware Synthesizer) system is discussed. Design Space Exploror adopts a three-demensional structure in contrast to the existing two-demensional structure. Design Space Explorer makes the three-demensional design space by calculating execution speed and the cost of the design system according to design level. So, The system designer can get the optimal design condition by comparing each design level in the three-demensional design space.

데이타 서브시스템 설계용 테이블 생성기 구현

이근만,이명호,조성국 청주대학교 산업과학연구소 1989 産業科學硏究 Vol.7 No.-

Digital system consists of control subsystem and data subsystem. In this thesis, We define the grammar of a HDL, construct its hardware compiler and finally design a tool which generate data subsystem table using LEX and YACC on the UNIX system.

太陽熱과 風力의 倂用 System 開發硏究

李近萬 淸州大學校 1985 論文集 Vol.18 No.2

Among the substitute energy sources which have been developed up to date, the most universal and widely utilized sources are solar energy and windpower. Solar energy has the advantages of having great amount of energy and limitless utilization area, and windpower has also the advantageses of generating electricity with a relatively simple method at the hilly districts and in the islands regions. Whereas when these energy sources are utilized independently, the single system will be inevitably accompanied by some disadvantages. When solar heat alone is utilized as an energy source, it is very difficult to generate needed electricity for the system, on the other hand, when windpower alone is utilized as an energy source, the amount of gene-rated electricity is not enough to promote the heat transfer capability. In view of those conditions, it will be advantageous to use both solar energy and wind power at the same time to solve the problems of heating and illumination at the hilly districts and in the islands regions where transportation and supply of electric power are under inconvenient conditions. In this study the writers tried to develop a device how the needed energy for the small-scale system can he supplied from the solar energy and windpower system at the same time using those two systems as an energy source, in other words, the combined use of the windpower and the solar energy system has been developed in this study. First, in the wind power system the electric power needed for the circulation and illumination should be supplied from the windmill, and the part of electric power generated by the windmill should de transterred to heat and this energy should be utilized for heating when the illumination will be unnecessary. Second, in the solar energy system the high-temperature heat should be utilized for heating. In order to promote the utility, in the solar energy system 1) the collecting utility was promoted an much as possible through the solar heat collector system with a parabolic cylindrical reflector. 2) outflow of heat was prevented by using polyurethane as a collecteor adiabatic material. 3) the heating utility was promoted as much as possible by attaching a heliotropic pursuit equipment. In the windpower system, 1) the windmill was designed and produced according to the calculated multiplying ratio of the multiplying gear, its blade angle and its blade length in view of the characteristics of the generator. 2) a simple electric power control circuit was attached in order to control the electric power effectively generated by the windmill. This is a solar energy system having fundamentally heat collecting capability of 5000Kcal/m², day and drainining capability of 1000cc/min, which is able to obtain heating efficiency, and it was designed to be able to drive one pump with 12V/20W and one pump with12V/10W needed for heated liquid circulation system and to light four fluorescent lamps for illumination. And the solar heat collecting system was designed to be able to collect heat as much as possible from the sunlight by attaching a manual clockwork timer to the collector, which can move around automatically according to the position of the sun. And the windpower system was also designed to supply sufficient amount of electric power for the load at hilly districts and in islands regions when the wind speed passes over 5m/s, for its whole consumption amount of electric current is 4A at the most. This system was designed and produced in consideration of small size and lightweight of its equipments which are easy to assemble, and its components being ready-made goods if possible. Therefore, when greater amount of energy will be required, this study should be pursued from a different angle.

고령의 정상면역자에서 발생한 위내 아스페르길루스증

이근만,이은해,장재훈,임현철,윤영훈,박효진,이상인 대한내과학회 2009 대한내과학회 추계학술대회 Vol.2009 No.-

CEBus 표준 전력선 통신용 밸브 차단장치

이근만 청주대학교 산업과학연구소 2004 産業科學硏究 Vol.21 No.2

In this paper, we design and build a low-cost powerline communication CEBus valve breaker whose fuctions are product category interoperability and industry category interoperability. The Implemented valve breaker also has the HomePnP functions, so the user can install this thermostatto the network without any knowledge of installation procedure because the thermostat can find its House-code and its Node address by itself. All the CEBus protocol codes, except physical link layer, are imbedded in a one-chip memory, and the physical link layer protocol are realized with a separate hardware because they are very sensitive to operation timing. The valve breaker, we finally designed and implemented, is based on the platform of one microcontroller(8052), 32Kb RAM, 128Kb Flash ROM, 256b NVM. To examine the operations of this powerline communication CEBus valve breaker and to evaluate its working speed, we monitored the hailing process and the packet receiving/ transmitting processes. At the results, we can find that hailing process takes about 5 minutes and the packet receiving/transmitting processes are finished its operation within a half of a second, which are within the requirements of CEBus and HomePnP Standard.

Interconnection 최적화를 위한 연산 스케줄링에 관한 연구

이근만 청주대학교 산업과학연구소 2004 産業科學硏究 Vol.21 No.2

In this paper, we deals with scheduling problem for data-path synthesis in high-level synthesis. We proposed a new method to optimize interconnection cost for operator allocation. Especially, we focus to optimize for buses to transfer data channel and register to restore operation result. Also we take account ILP formulation in order to get optimal scheduling result. To verify the effectiveness of this study, we select 5th Digital Wave Filter. The experimental result show that purposed method was better then the general methods.

상태합성기 설계를 위한 상태축소 알고리듬 제안 및 그래픽 에디터 개발에 관한 연구

이근만,임인칠 한국통신학회 1992 韓國通信學會論文誌 Vol.17 No.4

본 논문에서는 상태합성기 설계를 위하여 상태그래프를 자동으로 CHDL로 변환하는 그래픽 에디터를 개발하였다. 또한 FSN 합성과정 중에 상태테이블의 중독상태를 제거 할 수 있는, 구성이 간단하고 빠른 시간내에 최소해를 구할 수 있는 상태축소 알고리즘을 제안하였다. In this paper, we developed a Graphic Editor which automatically translated the state transition graph into state CHDL. Also, an algorithm for efficient state minimization is presented to reduce the redundancy state transition table.

춘계학술대회 : 포스터 전시 연제 ; 대칭성 색소 이상증 1예

이근만,김영근,김홍직 대한피부과학회 1986 대한피부과학회 학술발표대회집 Vol.38 No.1

MIcroprocessor 를 이용한 순간풍속의 측정방식에 관한 연구

이근만,박찬곤 淸州大學校 1982 論文集 Vol.15 No.2

This paper aims at discussing about a electronic measuring method of transient wind speed in contrast to the mechanic measuring method, which can only measure the average wind speed. By this method, transient wind speed can be measured at high speed owing to the minimal hardware and the shortest processing time. Thus this method will be considerably effective for the long-time monitoring of wind speed variation.

디지탈 시스템 설계 자동화를 위한 제어 상태표 및 데이타 테이블 생성

이근만,신희종,조성국 청주대학교 산업과학연구소 1992 産業科學硏究 Vol.10 No.-

On this thesis, as a method for the automated design of digital system, a generator is developed for the creation of control state table and data table from Hardware Description Language.