주기 신호 검출을 위한 회귀적 적응 알고리즘 및 응용에 관한 연구

정해택,김중규 대한전자공학회 1999 電子工學會論文誌, S Vol.s36 No.4

본 논문에서는 Jue Chang 과 John R. Glover 가 1993년에 제안한 회귀적 적응 주기 신호 검출기[1]를 소개하고 이를 구현하기 위한 최적의 실시간 알고리즘을 제안하여 회귀적 주기 신호 검출기의 실용적인 응용 예를 제시하였다. 회귀적 적응 주기신호 검출기(FALE:Feedback Adaptive Line Enhancer)는 기존의 적응 주기 신호 검출기에 회귀 경로를 달아줌으로써, 필터 차수를 같게 했을 때 낮은 신호 대 잡음비 환경 하에서 더 높은 필터 이득과 더 낮은 추정 오차를 얻을 수 있다. 회귀 경로를 통해 들어오는 필터 출력 신호는 회귀 이득 상수 값에 따라 전체 시스템의 성능이 달라지므로 최적의 회귀 이득 상수를 찾아내는 것이 중요하며 이는 회귀 이득 상수를 변화시키며 최적의 결과값(최소 추정오차)을 유도하는 실험을 통해 얻을 수 있다. 한편, 이를 구현하는 문제에 있어서는 일잔 최적의 회귀 이득 상수 값이 정해지면 회귀 이득 상수가 초기 값으로부터 최적 값에 도달하는 변화율과 변화 유형이 시스템의 실시간 구현 및 성능에 중요한 영향을 미치게 된다. 본 논문에서는 실험을 통해 최적의 구현 알고리즘을 찾아냄으로써 Jue Chang 과 John R, Glover가 제시한 이론적인 수렴율과 수렴 성능을 유지하면서 실시간으로 동작하는 시스템을 구현하고 모의실험을 통한 성능분석 결과를 제시하였다.

鑄鐵의 酸素-Acetylene 火焰Quenching에 依한 硬化能에 미치는 成分元素의 影響 : Effect of Silicon and Phosphorus

鄭海澤 東亞大學校 1964 東亞論叢 Vol.2 No.2

It may be unreasonable to estimate the hardenability of Cast iron on flame hardening mith reference to that of the conventional steel hardening conception. By oxygen-acetylene flame heating, Moreover, When cast iron is heated of by flame, graphite disloves in to the matrix more easily even a heating time. In this Report, the auther described the study on the hatdenability of Cast iron nith various content of Silicon and phosphorus. Ring type test piece were machine and flame treated by ring type oil burner, and hardness distribution were measured in Rockwell C scale on the hardened layer. Summing up the result of the experiment, it can be said as follows. 1) the tendency of surface hardness falls by overheating and the thickness of hardened layer decreases with increasing amount of silicon. 2) the thickness of the hardened layeu decreases with the increase of phos-pkorus amount in the case of severe flame heating, and phosphorus lowers the hardness of the surface layer in sihgt heating.

國內 熔銑爐의 調査 硏究

吳世旭,鄭海澤 東亞大學校 1967 東亞論叢 Vol.4 No.-

This report describes the investigation and study on the cupolas in pusan and Kyung-nam District, for which the antracitic-lump-coal has been used in Korea. Coke is used as the fuel for the cupola in every country of the world. In Korea, however, the coke has become very difficult to be produced since the end of the world was II, s) that the domestic anthractic-limp-coal only has been available, as this fuel has the low heating value and a great amount of the ash content and impurities, so the quality of casting has become more inferior. Thus it has cast a shadow over the future of the Korean machine industry. But nowadays it can be said that the quality of casting has been much developed and improved by the method of the trial and error proces for a long time, and yet the results being developed from an independent standhonint at each foundry have the various types of irrationality, so this report ead described for the purpose to investigate the special qualities of the cupola for the anthracitiv-limp-coal as a whole, to make some data for the cupola design from them and to find out some improvements of the cupola. The following are the summary about the special qualities of the cupola for th enthracitic-limp-coal comparing with te cupola for the coke. (1) The melting speed to the cupora inside diameter on tuyere plane is low as shown in Figure 2 and Figure 3. (2) The upper effectual height to the cupola inside diameter on tuyere plane is low and the lower effectual height is almost coinsident. (3) Tuyere ratio is very great, about 10 to 40. (4) Secondary tuyere or multiple step tuyere is more profitable. (5) The inclination of tuyere around 10 to 15 degrees is more profitable. (6) The calculation coefficient of the effectual inside diameter is very great as shown in Figure 11, Figure 12 and Table 5. (7) The tendency of the inferiority of casting quality being caused by the impurities of the anthracitic lump-coal should be developed by establishing front furnace. (8) Hot-blast should be established to increase the thermal efficiency and to get the high temperature melting carried out. Under the consideration of the above special qualities, the rational cupolas for the anthracitic lump-coal which are appiropriate the Korean situation should be designed.

Mn-鋼의 燒結機構에 關한 硏究(I)

鄭海澤 東亞大學校 1969 東亞論叢 Vol.6 No.-

The studies for the alloying of manganese to iron by powder metallurgical method presents some difficulties. Observations are made in this paper on the alloying of manganese to iron on the alloying process of Fe-Mn-C ternary system during sintering. The results obtained wear as follows; 1) Alloying structures of iron-manganese are partially obtained by sintering the compacts from mixtures of iron and 10% manganese powder at 1000-1000℃ in hydrogen an addition of carbon to this mixtures improves the alloying between iron and manganese; by adding more than 0.8% carbon to these mixtures, homogeneous structures are obtained at sintering temperature of 1100℃, the degrees of homogenization of alloying wear examined by photo spectro analyzer. 2) Following three mechanisms are proposed for the sintering of Fe-Mn-C ternary system. ⅰ) Alloying of manganese directly to iron ⅱ) Alloying of manganese to iron-carbon alloy ⅲ) Alloying of manganese-carbon alloy or manganese carbide to iron(at high carbon contact) In the case of sintering the compacts containing manganese oxide which is not readily reduced, an application of the alloying process (*ⅲ) may be effective.

어청도등 12개항에 295억원 - 계속투자9, 정비확장1, 보수보강2개항 -

정해택 한국어촌어항협회 1996 어항어장 Vol.34 No.-

회귀적 적응 주기신호 검출기의 실제적 구현에 관한 연구 ( A Study on the Practical Implementation of the Feedback Adaptive Line Enhancer )

정해택,김중규 대한전자공학회 1997 대한전자공학회 학술대회 Vol.1997 No.1

PdCu가 전기도금된 레이저 유도 그래핀 전극을 이용한 에탄올 효소 센서 개발

정해택(Haetaek Jeong),박상현(Sang Hyun Park),강승조(Seung-Jo Kang),박정호(James Jungho Pak) 대한전기학회 2021 전기학회논문지 Vol.70 No.2

This paper presents fabrication and characterization of an ethanol sensor whose working electrode (W.E.) is made consists of electrodeposited PdCu on laser induced graphene (LIG) layer and drop-casted alcohol oxidase (AOx) enzyme. AOx reacts with ethanol to generate hydrogen peroxide and the electrodeposited PdCu works as an electrocatalyst of hydrogen peroxide in order to increase amperometric output current. The optimum conditions for the ratio between Pd and Cu, the drop-casted AOx amount, the pH value of PBS have been obtained by varying the fabrication conditions and comparing the output results. Field emission scanning electron microscope (FE-SEM) and Raman spectroscopy were used to confirm LIG electrode formation. Also, Energy-dispersive X-ray spectroscopy (EDS) was performed to verify the ratio of the electrodeposited Pd and Cu. Cyclic voltammetry (CV) analysis of the W.E. showed that the peak reduction current occurs at –0.045 V. and this voltage was chosen as an applied voltage in amperometric measurement. Electrochemical impedance spectroscopy (EIS) shows that the charge transfer resistance of the PdCu deposited LIG W.E. is lower than the bare LIG W.E., which also shows the output current accordingly. Chronoamperometric response of the fabricated sensor was measured at various ethanol concentrations in range of 0-12 mM, and the linear sensitivity was 17.99 ㎂mM<SUP>-1</SUP>cm<SUP>-2</SUP>. which is similar or better than those of the recently reported other ethanol sensors.

스마트폰 기반 실시간 모니터링을 위한 전류법 및 전압법 동시 측정용 IoT 센서 시스템 개발

정해택(Haetaek Jeong),강승조(Seung-Jo Kang),박상현(Sang Hyun Park),정성은(Seong-Eun Jeong),박정호(James Jungho Pak) 대한전기학회 2020 대한전기학회 학술대회 논문집 Vol.2020 No.7