수중 표적의 방위각 탐지를 위한 신호처리기 설계

홍춘표,장경영 대구대학교 과학기술연구소 1997 科學技術硏究 Vol.4 No.2

This paper presents a set of design techniques for detecting the bearing of underwater target. Basically the signal processor measures the time delay between two signals that come from the underwater sensors. The bearing is functions of the velocity of underwater sound, the distance between two sensors, and the time delay between sowed. The signal processor designed in this research uses the Polarity Coincidence Correlation (PCC) techniques to measure the time delay between sensors. In such case, to simplify the processor's hardware complexity, the correlation coefficient are obtained only using the phase information instead of phase and amplitude informations. In this paper, we propose a new technique for computing the correlation coefficient, in which the idea is the shifted data storing in memory. This technique is proved to be very efficient and fast, and can easily be extended to the large system. The field test results show that the processor designed in this research can be applicable to small system.

전지면실(Whole Cotton Seeds, Full Fat Cotton Seeds)의 젖소급여에 관하여

홍춘표 대한수의사회 1990 대한수의사회지 Vol.26 No.7

WE DSP32 디지탈 신호처리기를 이용한 LPC해석 및 합성 알고리즘의 실시간 실현

홍춘표,황병곤,남인길 대구대학교 (한사대학) 산업기술연구소 1994 産業技術硏究 Vol.13 No.-

The WE DSP32 in AT&T's second-generation programmable digital signal processor with 32-bit floating point arithmetic. This device can be used in a wide varity of complex digital signal processing algorithms such as speech recognition,high speed modems, low-bit rate voice coders, and multichannel signaling system. This paper reviews the LPC analysis and synthesis of speech signal and presents a real time implementation methodology of these algorithms using the WE DSP32. For efficient data handling, circular buffer is proposed. The implementation results show that deep pipelining characteristics of the processor should be fully utilized to satisfy the timing constraints,

필드버스의 구현에 관한 연구

홍춘표,최승국,홍계표 대구대학교 과학기술연구소 1998 科學技術硏究 Vol.5 No.4

In Pneumatic Fieldbus System, we need a data transmission system with high speed and high realibility for information interchange between main computer and solenoid valves and I/O devices. This paper presents a set of design techniques for a data communication system that is mainly used for pneumatic fieldbus system. For this purpose, we first designed hardware modules for an interface between central control module and local node that handles the operation of solenoid valves. In addition we developed a communication protocol for construction of RS-485 based multidrop network, and this protocol is basically designed with a kind of polling technique. Finally we evaluated performance of the developed system. The field test results show that, even under high noise environment, the data transmission of 375Kbps rate is possible up to 1,000m without using repeater. In addition, the system developed in this research is proved to be used easily for extension of a communication network because of its module structure.

모든 양계인의 협조로 홍보사업을 강화해야

홍춘표 대한양계협회 1986 월간 양계 Vol.18 No.1

파이프라인 프로세서를 이용한 플로우 그래프의 최적화 실현

홍춘표 대구대학교 산업기술연구소 1994 産業技術硏究 Vol.13 No.-

This paper presents a set of techniques to automatically find rate optimal or near rate optimal implementations in pipelined processing environments for DSP algorithms that are represented by recursive shift-invariant flow graphs. An instruction scheduling methodology for a single pipelined processor is presented. In such case, the problem to be addressed is the scheduling of a single instruction stream which controls all of the pipeline stages. The goal of an automatic scheduler in this context is to rearrange the order of instructions such that they are executed with minimum iteration period between successive iteration of defining flow graphs. Since the node execution times in defining flow graphs are deterministic, this research addresses compile time scheduling.

The Stability Constant of Transition and Lanthanide Metal Ions Complexes with 15 Membered Macrocyclic Azacrown Ligands

홍춘표,최용규,Hong, Choon-Pyo,Choi, Yong-Gu,Choppin, G.R. Korean Chemical Society 2004 대한화학회지 Vol.48 No.6

새로운 아자크라운 화합물인, 1,4-dioxa-7,10,13-triazacyclopentadecane-N,N',N''-triacetic acid, $N-ac_3[15]aneN_3O_2(II_a)$과 1,4-dioxa-7,10,13-triazacyclopentadecane-N,N',N''-tripropioc acid, $N-pr_3$[15]ane$N_3O_2(II_b)$는 이와 유사한 화합물의 합성방법을 수정하여 합성하였다. 합성된 이 아자크라운 화합물, $N-ac_3[15]aneN_3O_2와\;N-pr_3[15]aneN_3O_2$의 양성자화 상수값은 전위차법을 이용하여 PKAS 프로그램으로부터 측정되어졌다. 그리고 0.1 M $NaClO_4$수용액으로 이온강도를 조절하고, $25{\pm}0.1^{\circ}C$에서 란탄족금속인, $Ce^{3+},\;Eu^{3+},\;Gd^{3+}$ 및 $Yb^{3+}$과 리간드인 $N-ac_3[15]$ane$N_3O_2$와 $N-pr_3[15]aneN_3O_2$의 착물의 안정도상수를 전위차법을 이용하여 BEST 프로그램으로부터 구하였고, 또한 위와 같은 조건에서 전이금속인 $Co^{2+}$, $Ni^{2+}$, $Cu^{2+}$및 $Zn^{2+}$와 리간드인, $N-ac_3[15]aneN_3O_2$와 $N-pr_3[15]aneN_3O_2$의 착물의 안정도상수 값도 전위차법을 이용하여 BEST 프로그램으로부터 측정하였다. 합성된 아자크라운 화합물과 골격구조가 유사하고 아세트산과 프로피온산기를 포함하는, 1,7-dioxa-4,10,13-triazacyclopentadecane-N,N',N''-triacetic acid과 1,7-dioxa-4,10,13-triazacyclopentadecane-N,N',N''-tripropioc acid의 착물의 안정도를 비교분석하였다. The azacrown compounds, 1,4-dioxa-7,10,13-triazacyclopentadecane-N,N',N''-triacetic acid, $N-ac_3[15]aneN_3O_2(II_a)$ and 1,4-dioxa-7,10,13-triazacyclopentadecane-N,N',N''-tripropioc acid, $N-pr_3[15]aneN_3O_2(II_b)$ were synthesized by modified methods. Potentiometry was used to determine the protonation constant of the $N-ac_3[15]aneN_3O_2\;and\;N-pr_3[15]aneN_3O_2$. The stability constants of complexes of the trivalent metal ions of $Ce^{3+},\;Eu^{3+},Gd^{3+},and\;Yb^{3+}$ and divalent metal ions of $Co^{2+},\;Ni^{2+},\;Cu^{2+},\;and\;Zn^{2+}$ with the ligands $N-ac_3[15]aneN_3O_2\;and\;N-pr_3[15]aneN_3O_2$ have been determined at $25{\pm}0.1^{\circ}C$ in 0.1 M $NaClO_4$ solution by potentiometric methods. The metal ion affinities of the two triazamacrocyclic ligands with three pendant acetate or propionate groups are compared to those obtained for the similar ligands, 1,7-dioxa-4,10,13-triazacyclopentadecane-N,N',N''-triacetic acid, and 1,7-dioxa-4,10,13- triazacyclopentadecane-N,N',N''-tripropioc acid. The trends in stability of complexes for different metal ions due to changes in the nitrogen position of the donor atoms of the ligand are discussed.

메모리 공유형 다중 프로세서의 동기화를 위한 Spin-Lock 기법의 성능 분석

홍춘표,이종임,남상균 대구대학교 과학기술연구소 1997 科學技術硏究 Vol.4 No.3

Most of the shared-memory multiprocessor system provide a hardware primitive for supporting mutually exclusive accesses to shared data. The hardware primitive consists of instructions that atomically read and write a single memory location. When a processor is accessing a shared data, the lock is set to busy, and other processors must wait until the lock is released. This paper analyse the characteristics of four spin-lock alternatives, and compare the performance of the proposed scheme through the simulation on shared-memory multiprocessor (Sequent-Balance). The simulation results show that all the spin-lock alternatives for synchronization degrade overall performance as the number of spinning processors increases. In addition, a variant of Ethernet backoff scheme shows good performance even for large numbers of spinning processors. Because of its simplicity, backoff scheme has better performance when there is no contention for the lock.

자동차 부품 공장 집중관리 시스템 개발

홍춘표,김종완 대구대학교 공과대학 1997 산학연 공동기술개발컨소시엄 최종보고서 Vol. No.

TV용 전자부품 생산공정관리 시스템 개발

홍춘표 대구대학교 공과대학 1998 산학연 공동기술개발컨소시엄 최종보고서 Vol. No.