Spark Plasma Sintering을 이용한 Cu-26.7Zn-4.05Al(wt.%) 형상기억합금의 제조

박노진,이인성,조경식,김성진,Park, No-Jin,Lee, In-Sung,Cho, Kyeong-Sik,Kim, Sung-Jin 한국재료학회 2003 한국재료학회지 Vol.13 No.6

In order to control the grain size, the spark plasma sintering technique is applied for the manufacturing of Cu-26.7Al-4.05AI(wt.%) shape memory alloy with pure Cu, Zn, and Al element powders. The sintering processes were carried out under different atmospheres. The sintered bodies were denser under Ar or Ar+4%$H_2$gas atmosphere than under vacuum. With use of small-sized powders, a very small average grain size of 2∼3 $\mu\textrm{m}$ was obtained, but the single phase was not formed. With the large-sized powders the single austenitic phase was observed with the average grain size of $70∼72\mu\textrm{m}$. When the different size of raw powders was mixed, it is confirmed that the average grain size of the manufactured alloys was 15 $\mu\textrm{m}$ with single austenitic phase, but the distribution of grain size was not uniform.

CRT Shadow Mask용 Invar의 에칭성 및 성형성 평가방안

박노진,오명훈,Park, No-Jin,O, Myeong-Hun 한국정보디스플레이학회 2001 한국정보디스플레이학회지 Vol.2 No.5

이동통신 시스템의 Time Varying 채널 환경에서 채널 등화에 관한 연구

박노진,김동옥,Park No-Jin,Kim Dong-Ok 한국정보통신학회 2006 한국정보통신학회논문지 Vol.10 No.1

차세대 이동통신 시스템은 고속의 멀티미디어 데이터의 신뢰성있는 전송을 요구하고 다양한 전파환경에서 신뢰성 있는 음성, 데이터, 영상서비스 등의 다양한 서비스를 제공한다. 하지만 광대역 무선접속을 지원하는 다중접속기술은 CDMA(Direct Sequence Code Division Multiple Access) 시스템에서 시스템 성능을 저하시키는 심벌간 간섭(ISI) 혹은 다중접속간섭(MAI) 신호를 발생시킨다. 이러한 간섭 신호를 개선하기 위해 적응 블라인드 등화 방식을 사용하는데 적응 블라인드 등화 방식 중에서도 가장 많이 이용하는 Constant Modulus Algorithm(CMA)을 적절한 초기화 없이 사용하면 ill-convergence 현상이 나타난다. 본 논문에서는 채널의 효율을 높이기 위한 등화 방식으로 기존의 CMA 알고리듬을 이용한 새로운 블라인드 등화 방식을 제안하고, 이를 이동통신 시스템의 Time Varying Fading 채널환경에서 컴퓨터 모의실험 및 성능분석을 하였다. 따라서 Kalman 필터와 CMA를 결합한 새로운 등화기법은 자승 오차와 Eye-Pattern의 성능 비교를 통해 기존의 방법 보다 우수함을 확인할 수 있었다. The third generation mobile communications system requiring the reliable multimedia data transmission has provided with the reliable voice, data and video services over the variable propagation environment. However the broadband wireless multiple access technologies cause Inter Symbol Interference(ISI) or Multiple Access Interference(MAI) to degrade the performance of CDMA(Code Division Multiple Access) system. Constant Modulus Algorithm which is frequently used as the adaptive blind equalizers to remove the interfering signal has ill-convergence phenomenon without proper initialization. In this paper, new blind equalization method based on conventional CMA is proposed to improve the channel efficiency, and through computer simulation this is tested over the time varying fading environment of mobile communication system. consequently, new blind equalization method into concatenated Kalman filter with CMA is verified better than conventional CMA through adopting minimum mean square errors and eye-pattern obtained from algorithm are compared.

방송통신 시스템에서 UWB 전파가 서비스에 미치는 영향에 관한 연구

박노진,Park, No-Jin 한국정보통신설비학회 2007 정보통신설비학회논문지 Vol.7 No.1

본 논문에서는 UWB 시스템이 근처의 단일 장비 또는 집단 장비와의 간섭영향이 방송통신서비스에 미치는 영향에 관한 연구를 하였다. 이를 위해 UWB 시스템에서 방사되는 불요 방사 레벨에 따른 신호의 간섭을 비롯한 전파 간섭 특성이 인접 대역인 2.6425GHz SDMB(Satellite Digital Multimedia Broadcasting)와, In-band 대역인 3.4125GHz 방송 중계망과 서비스에 미치는 간섭영향의 정도를 비교 분석하였으며, 방송 중계망과 간섭측정 장비의 변조방식은 Impulse 방식과 OFDM 방식을 사용하였다. SDMB 시스템에서 Impulse 방식은 2m 지점에서부터 간섭 영향이 발생하여 1.4m 지점에서 방송 신호 수신이 가능한 $BER\;=\;1{\times}\;10^{-4}$ 이었으며, OFDM 방식은 0.8m 지점에서부터 간섭 영향을 받아 0.5m 지점에서 방송 신호 수신이 가능한 $BER\;=\;1{\times}\;10^{-4}$ 이었다. 또한 Gap-Filler 중심 주파수에 대해서는 0.01m 이상 이격 시는 간섭영향이 없었다. 따라서 소출력인 UWB 시스템의 전파가 방송통신서비스에 간섭 영향 없이 시스템에 적용하기 위해서는 Impulse 방식의 UWB 시스템보다 OFDM 방식의 UWB 시스템이 간섭 영향이 적다는 것을 확인하였다. In this paper, UWB system did research about effect that interference effect with neighborhood single equipment or group equipment gets in broadcasting communication service. For this, 2.6425GHz SDMB(Satellite Digital Multimedia Broadcasting) that a special of electric wave interference is near frequency-band including interference of signal by unnecessary radiation level that is radiated in UWB system, and degree of 3.4125GHz broadcasting relay net that is In-band frequency-band and interference effect that get in service analyzed comparison and, modulation of broadcasting relay net and interference measurement equipment used Impulse and OFDM methods. Impulse method was $BER\;=\;1{\times}\;10^{-4}$ that broadcasting signal receiption is possible at 1.4m point because interference effect happens from 2m point in SDMB system, and it was $BER\;=\;1{\times}\;10^{-4}$ that OFDM method receives interference effect from 0.8m point and broadcasting signal receiption is possible at 0.5m point. Also, about Gap-Filler center frequency, In case of space interval more than 0.01m, there was no interference effect. Therefore, for the electric wave of UWB system that is small output applies to system without interference effect in broadcasting communication service, confirmed that UWB system of OFDM method is less interference effect than UWB system of Impulse method.

낙동강수계의 유기염소계 농약류 잔류특성과 위해성 평가

박노진 ( No Jin Park ),옥곤 ( Gon Ok ),허성남 ( Seong Nam Heo ),임영경 ( Young Kyong Lim ),이재관 ( Jae Kwan Lee ) 한국환경분석학회 2012 환경분석과 독성보건 Vol.15 No.3

Five organic chlorinated pesticides (OCPs) were monitored for the water samples in the Nakdong river basin. Samples were collected from the 33 representative points and the 5 industrial complex discharge points over 6 sampling events. Heptachlor and trans-heptachlor epoxide were not detected for all samples while dieldrin was detected once at the first sampling event. The measured concentrations of hexachlorobenzene and cis-heptachlor epoxide for the representative sites ranged from N.D to 0.0057 ng/L and from N.D to 0.078 ng/L, respectively. The levels of hexachlorobenzene and cis-heptachlor epoxide were N.D to 0.173 ng/L and N.D to 0.134 ng/L, respectively. It seems like that risk at the monitored level of organic chlorinated pesticide was not serious. However, the maximum concentration of cis-heptachlor epoxide exceeded the water quality criteria (WQC) of U.S EPA. The average concentrations of organic chlorinated pesticides for the industrial complex discharge points were relatively higher than those for the representative sites of the Nakdong river, however, the risk by industrial OCP discharge seems also not serious.

합성 윤활유 및 고압 작동유 누출감지 필름형 센서의 구현

박노진 ( No Jin Park ),유동근 ( Dong Kuen Yu ),유홍근 ( Hong Kuen Yu ) 한국센서학회 2014 센서학회지 Vol.23 No.4

Chemical sensors are used in various industrial facilities such high-risk and prevent the leakage of substances, important in life and environmental protection and the safe use of industry, used for management. In particular, high-temperature environments such as power generation equipment of the rotating part due to leakage generated by the various oil, power plants Shut Down, fire, work environment (exposure to various chemical solution and gas leak) and various water, air and soil pollution causes. Thus, over the long term through various channels such as crops and groundwater contamination caused by the slow, serious adverse effect on the ecosystem. In this paper, synthetic lube oil and high pressure hydraulic fluid leakage and immediately detect a new Printed Electronic implementation of technology-based filmtype sensors, and its performance test. Thus, industrial accidents and environmental pollution and for early detection of problems, large accidents can be prevented. Experimental results of the synthetic lube oil and high pressure hydraulic fluid solution after the contact time depending on the experiment and the oil solution of the sensor material of the conductive porous PE resistance value by a chemical reaction could be confirmed that rapid increase. Also implemented in the film-type oil sensor electrical resistance change over time of the reaction rate and the synthetic lube oil is about 2 minutes or less, the high pressure hydraulic fluid is less than about 1 minute was. Therefore, more high-pressure hydraulic fluid such as a low volatility synthetic lube oils are the resistance change and the reaction rate was confirmed to be the slowest.

재료에서 집합조직의 측정 , 해석과 물성에의 응용

박노진 ( No Jin Park ) 대한금속재료학회 1997 大韓金屬學會會報 Vol.10 No.3

AZ31 마그네슘합금의 집합조직에 따른 인장특성

박노진 ( No Jin Park ),황중호 ( Joong Ho Hwang ),노재승 ( Jae Seung Roh ) 대한금속재료학회 2009 대한금속·재료학회지 Vol.47 No.1

시중에 유통되고 있는 산수유 음료의 Morroniside, Loganin 및 Cornin 함량과 이화학적 특성

박수진(Su-Jin Park),정지숙(Ji-Suk Jeong),정재훈(Jae-Hun Jeong),박노진(No-Jin Park),손병길(Byeong-Gil Son) 한국식품영양과학회 2017 한국식품영양과학회지 Vol.46 No.8

본 연구는 산수유 음료 개발에 기초자료로 활용하고자 시중에 유통 중인 산수유 파우치 형태 액상제품 18종의 제품을 수거하여 기능성 성분 함량 및 이화학적 품질특성을 조사하였다. 가장 많이 함유되어 있는 유효물질은 morroniside였으며, 다음으로 loganin, cornin 순이었다. 구례 지역 생산산수유 제품의 1 · 2차 평균 유효물질 morroniside, loganin 및 cornin의 함량이 각각 89.55, 66.04, 12.91 mg/100 g으로 전체 평균 77.22, 45.51, 8.16 mg/100 g보다 유의적으로 높게 측정되었다. Morroniside가 전체 평균보다 높은 제품은 각각 7개 및 7개였으며, loganin은 6개 및 4개, cornin은 8개 및 1개였다. 또한, cornin이 전혀 검출되지 않은 제품도 1차 및 2차에서 각각 1개 및 4개 있었다. 지역별 유효성분 차이는 구례지역이 타 지역에 비해 morroniside 함량 2차 분석을 제외하고 모든 유효성분 함량이 높았다. 그러나 대부분 제품의 유효물질 함량이 유의적인 차이를 나타내었다(P<0.05). 이상의 결과를 종합해보면 품질이 우수한 산수유 음료를 생산하기 위해서는 원료의 표준화와 추출조건과 같은 추출공정의 표준화 연구가 필요할 것으로 판단된다. The present study collected 18 kinds of commercially circulated liquid Sansuyu (Corni fructus) in pouch form and conducted comparative analysis on markings and physicochemical characteristics in order to utilize this information as a base material for the development of Sansuyu liquid products. The most abundant valid substance was morroniside, followed by loganin and cornin, in that order. Total concentration of valid substances in Cornus fruit products produced in the Gurye region was 168.50 mg/100 g, which was significantly higher than the overall average of 130.89 mg/100 g. There were seven (1st) and seven (2nd) kinds that contained more morroniside than the overall average, six (1st) and four (2nd) kinds with more loganin than the overall average, and eight (1st) and one (2nd) kinds with more cornin than the overall average. There were also five types in which no loganin was detected. There were significant differences in the valid substances of most products according to production period. Overall, these results show that processing method standardization research on extraction conditions is needed to produce liquid Sansuyu products of excellent quality.

반음절쌍과 변형된 연쇄 상태 분할을 이용한 연속 숫자음 인식의 성능 향상

김동옥,박노진,Kim Dong-Ok,Park No-Jin 한국정보통신학회 2005 한국정보통신학회논문지 Vol.9 No.8

본 논문에서는 언어모델과 음향모델을 개선함으로써 단위 숫자음의 인식성능 최적화에 대해 설명한다. 언어모델은 한국어 단위 숫자음 문장의 문법적 특징을 분석하고, FSN 노드를 두음절로 구성하여 오 인식률을 감소시켰다. 음향모델은 단음절로 구성되어 발성기간이 짧고 조음이 많이 생기는 불명확한 음소, 음절의 분할로 연한 오 인식을 줄이기 위해 인식단위를 반음절쌍으로 하였다. 인식단위의 특징을 효과적으로 모델링하기 위해 특징레벨에서 K-means 알고리즘(4)으로 클러스터링 하여 상태를 분할하는 변형된 연쇄 상태 분할방법을 이용하였다. 실험 결과 제안된 언어모델의 적용 후 동일 문백종속 음소모델에서 $10.5\%$, 음향모델에서 인식단위를 반음절쌍으로 하였을 경우 문백종속 음소모델에 비해 $12.5\%$, 변형된 연쇄 상태분할을 하였을 경우 $1.5\%$의 인식률을 향상시킬 수 있었다. This paper describes an optimization of a language model and an acoustic model that improve the ability of speech recognition with Korean nit digit. Recognition errors of the language model are decreasing by analysis of the grammatical feature of korean unit digits, and then is made up of fsn-node with a disyllable. Acoustic model make use of demi-syllable pair to decrease recognition errors by inaccuracy division of a phone, a syllable because of a monosyllable, a short pronunciation and an articulation. we have used the k-means clustering algorithm with the transformed successive state splining in feature level for the efficient modelling of the feature of recognition unit . As a result of experimentations, $10.5\%$ recognition rate is raised in the case of the proposed language model. The demi-syllable pair with an acoustic model increased $12.5\%$ recognition rate and $1.5\%$ recognition rate is improved in transformed successive state splitting.