연구논문 : 철도교통소음의 특성에 관한 연구

최형일 ( Hyung Il Choi ),박상일 ( Sang Ill Park ),염동익 ( Dong Ick Yeom ) 한국환경과학회 2007 한국환경과학회지 Vol.16 No.7

시공간 적응탐색에 의한 실시간 이동물체 추적

김계영,최형일,Kim, Gye-Young,Choi, Hyung-Ill 대한전자공학회 1994 전자공학회논문지-B Vol.b31 No.11

본 논문에서는 연속적으로 입력되는 영상에서 이동물체에 대한 정보를 추출하고 카메라의 시계(field of view)를 변경시키는 서보기기를 제어하여, 이동물체가 항상 영상의 중심에 위치하도록 하는 작업을 실시간에 수행하는 시스템에 대하여 기술한다. 영상은 방대한 양의 2차원적인 신로이므로 주어진 영상 잔체에 필요한 연산(operation)을 수행하는 것은 방대한 계산시간을 필요로 한다. 특히, 메모리에서 화소들의 값을 처리기로 로딩(loading)하는데 소요되는 시간은 영상의 크기에 비례하여 기하급수적으로 증가한다. 따라서, 본 논문에서는 이러한 문제를 해소하고 이동물체에 대한 추적을 실시간에 수행하기 위하여 영상공간 및 시간공간을 선별적으로 탐색하는 방안에 초점을 맞춘다. 영상공간 및 시간공간을 선별적으로 탐색하면서 이동물체를 추적하기 위하여 본 논문에서는 물체가 카메라의 시계에 진입하는 것과 진입방향을 감지하는 방법, 진입방향에 따라 이동물체를 효과적으로 탐색하는 방법, 물체의 이동속도와 중심을 산출하는 방법, 서보기기의 성능과 물체의 속도 및 처리시간을 고려하여 소보기기를 제어하는 방법, 그리고 변화하는 속도의 물체를 추적하기 위하여 영상간의 시간간격(${\Delta}$t)을 적당히 조절하는 방법에 대해서 기술한다. This paper describes the real-time system which, through analyzing a sequence of images, can extract motional information on a moving object and can contol servo equipment to always locate the moving object at the center of an image frame. An image is a vast amount of two-dimensional signal, so it takes a lot of time to analyze the whole quantity of a given image. Especially, the time needed to load pixels from a memory to processor increase exponentially as the size of an image increases. To solve such a problem and track a moving object in real-time, this paper addresses how to selectively search the spatial and time domain. Based on the selective search of spatial and time domain, this paper suggests various types of techniques which are essential in implementing a real-time tracking system. That is, this paper describes how to detect an entrance of a moving object in the field of view of a camera and the direction of the entrance, how to determine the time interval of adjacent images, how to determine nonstationary areas formed by a moving object and calculated velocity and position information of a moving object based on the determined areas, how to control servo equipment to locate the moving object at the center of an image frame, and how to properly adjust time interval(${\Delta}$t) to track an object taking variable speed.

알루미늄 부식 반응조를 조합한 MLE공정에서 하수의 질소와 인 제거

박상일 ( Sang Ill Park ),최형일 ( Hyung Il Choi ),정경훈 ( Kyung Hoon Cheong ),박대훈 ( De Hoon Park ) 한국환경과학회 2013 한국환경과학회지 Vol.22 No.11

The pilot plant experiment was performed to investigate phosphorus and nitrogen removal from domestic wastewater byMLE process combined with aluminum corrosion reactor. When operating 0.5Q and 1Q to internal recycle and sludge recycle in the MLE process, the effluent CODMn concentration of internal recycle 0.5Q were higher than internal recycle 1Q, the removal efficiency rates of NH3-N in the internal recycle 0.5Q were was higher than internal recycle 1Q. Denitrification rates were about 86.8% in internal recycle and sludge recycle 0.5Q. When operating 0.5Q to internal recycle and sludge recycle in the MLE process, the removal efficiency rates of total nitrogen was the highest. The removal efficiency rates of total phosphorus was about 91.5% in the aluminum corrosion reactor.

감차수국 추출물이 당뇨 유발 흰쥐의 혈당에 미치는 영향

박상일 ( Sang Ill Park ),정경훈 ( Kyung Hoon Cheong ),최형일 ( Hyung Ll Choi ),김용현 ( Yong Hyeon Kim ),김학선 ( Hak Sun Kim ) 조선대학교 공학기술연구원 2009 공학기술논문지 Vol.2 No.2

The study was conducted to investigate the effects of Hydrangea macrophylla var. t1mnbergii extract on blood glucose and lipid concentrations in streptozotocin-induced diabetic rats. Experimental groups were classified into six groups, that is, normal control(Con) group, streptozotocin control(CI) group, Hydrangea macrophylla var. thunbergii(C2) group, hydrangea macrophylla var. thunbergii(50%) + polygonatum odoratum(50%)(C3} group, hydrangea macrophylla var. thunbergii(50%} + Cassia tora(50%)(C4) group, hydrangea macrophylla var. thunbergii(50%) + polygonatum odoratum(25%) + Cassia tora(25%)(C5) group. The blood glucose of C2 and CS groups decreased from 3 weeks. During 6 weeks, the weight of Con group increased S2.93% and C I group decreased S9%. The weight of C2, C3, C4 and CS group \vas 12, 27, 24 and IS%, respectively. The C2 group decreased the fewest. In the CS group, high density lipoprotein(I-IDL) cholesterol(47.4 ± 2.7 mg/dl) decreased the fewest and the triglycerides (63.9 ± 5.2 mg/dl) increased the fewest. Total cholesterol concentration of C2 group(63.8 ± 8.1 mg/dl) was lower t11an the C I group. In conclusion, it seems that Hydrangea macrophylla var. thunbergii extract has an effect on blood glucose, triglycerides, liver function protection etc.

수죽력과 수죽력 스팀 추출물의 항균활성 및 아질산염 소거작용에 관한 연구

박상일 ( Sang Ill Park ),최형일 ( Hyung Il Choi ),위환 ( Hwan Wi ),박대훈 ( Dae Hoon Park ) 조선대학교 공학기술연구원 2009 공학기술논문지 Vol.2 No.3

In the present study, we evaluated the antibacterial activities and Nitrite scavenging ability of bamboo sap and bamboo sap steam extract. Our analysis revealed that the total phenolic compounds containing the tannic acid in the bamboo sap extract showed 12.7% and in the case of bamboo sap steam extract was 20.9% respectively. The nitrite scavenging ability of bamboo sap steam extract showed about 51%. The antibacterial activities of bamboo sap steam extract on Bacilus subtilis, Listeria monocytogenes, Salmonella choleraesuis subsp. Choleraesuis and Escherichia coli were 13.8, 12.0, 13.5 and 8.3 mM respectively. Furthemore, the bamboo sap steam extract have showed thermostability and no effect on their antibacterial property under themal conditions. Therefore, this finding is useful for the utility of these compounds as additives in food preservations.

고층 아파트의 도로교통소음 전파특성에 관한 연구

박상일 ( Sang Ill Park ),최형일 ( Hyung Il Choi ),정경훈 ( Kyung Hoon Cheong ),염동익 ( Dong Ick Yeom ),정원삼 ( Won Sam Jeong ),김난희 ( Nan Hee Kim ) 조선대학교 공학기술연구원 2009 공학기술논문지 Vol.2 No.1

Suggesting countermeasures against traffic noise, the result of modeling the noise level distribution of the apartment using RAYNOISE is as follow. l. Characteristic of Noise Level Attenuation as per Frequency of Apartment Space Comparing the difference of measured values on the balcony and in the enter of the living room had a minus value for an applicable value of 62%, which means the balcony is the path where the, sound is being passed. Because the center of the living room is a closed space, it is considered that the sound became higher by reflection and diffraction of sound in the living room. Change of frequency. Attenuation as per space in the 1st, 5th and 8th floors showed the attenuated condition becoming greater as frequency rose by 1 kHz, and it became greater on the higher floor at 31.5 Hz and 63 Hz. On the 11th floor, 63 Hz appeared to have a higher attenuated condition, and it was attenuated similarly in general. 2. Modeling Using RAYNOISE for Noise Level and Characteristics of Frequency in Apartment Space Noise levels measured on the exterior wall of the apartment, on the balcony and in the center of a living room revealed to be higher in low frequency bandwidths in the lower floors. They decreased on the higher floors including the 7th and 8th floors, increased then decreased again on the 9th floor. The noise level in the living room was 45.3 dB(Z), which appeared to be higher than that of the balcony(41.1 dB(Z)). It was also higher than the balcony in all frequency bandwidths. We then compared noise level in two cases while the window of the living room was open. The first case kept the window of balcony 2(bed room 2 directions) closed while the window of balcony 1(living room directions) remained open. The second case kept the window of balcony 1(living room directions) closed while the window of balcony 2(bed room 2 directions) remained open. The noise level in the center of the living room was 45.0 45.6 dB(Z) in the former case and 28.5 29.5 dB(Z) in the latter, thus showing the attenuated effect of f 5.9 16.6 dB(Z). The attenuated effect appeared to be 16.9 17.9 dB(A) characteristics of A.

도로교통 소음지도 작성에 관한 연구

박상일 ( Sang Ill Park ),최형일 ( Hyung Il Choi ),정경훈 ( Kyung Hoon Cheong ),염동익 ( Dong Ick Yeom ),진창범 ( Chang Beom Jin ) 한국환경과학회 2007 한국환경과학회지 Vol.16 No.12

차종별 도로교통소음레벨과 주파수 특성에 관한 연구

박상일 ( Sang Ill Park ),최형일 ( Hyung Il Choi ),정경훈 ( Kyung Hoon Cheong ),정원삼 ( Won Sam Jeong ),김난희 ( Nan Hee Kim ),이종국 ( Jong Kuk Lee ),오남승 ( Nam Seung Oh ) 조선대학교 공학기술연구원 2008 공학기술논문지 Vol.1 No.2

Quantitative evaluation for the sound source to predict the noise in the field point for the Road Traffic Noise was conducted. The traffic noise level and frequency characteristics as per types of cars for wave process until the noise reaches the field point was measured. 1. Frequency Characteristics while Driving Under freely flowing conditions of traffic, when you drive a bus on a public road, the traffic noise level showed a change of 6.2 dB(Z) from 83.1 dB(Z) to 89.3 dB(Z).The change of traffic noise level was 6.3 dB(Z) from 81.7 dB(Z) to 88 dB(Z) when a van was driven, and 10.8 dB(Z) from 79.5 dB(Z) to 90.3 dB(Z) when a one-ton truck was driven. Also, the change of traffic noise level was 18.6 dB(Z) from 81.3 dB(Z) to 99.9 dB(Z) when a motorcycle was running. All vehicles except for the motorcycle showed similar noise levels of 31.5, 500, 1 k and 2 kHz. The bus showed the highest noise level at 63 Hz and 125 Hz, and a van and an 11 ton truck showed the highest levels at 125 Hz. The one-ton truck was measured at 63 Hz for the highest noise level. The motorcycle was measured at 250 Hz with the highest noise level of 96.7 dB(Z) and at 500 Hz with 95.5 dB(Z), indicating the highest noise level among specific vehicles. 2. Characteristic of Frequency upon Departure The noise level when an urban bus stops to depart was 94.6 dB(Z), which is higher than that of stoppage and driving. When a bus stops, the normal car have an influence on the noise level, and after departure, it brings out the highest noise at 250 Hz and 500 Hz, which is caused by noises from the engine and exhaust. The noise level when a normal car stops to depart was higher than that of stoppage and driving at 85.7 dB(Z). It is high at 63 Hz as it is being reduced from 250 Hz. While a normal car is stopping, higher noise is made at 31.5 Hz, which is considered to be caused by engine noise.

하수처리 : 알루미늄판 부식을 조합한 활성슬러지법에서 오수중의 인 제거

정경훈 ( Kyung Hoon Choeong ),최형일 ( Hyung Il Choi ),정오진 ( Oh Jin Jung ),박상일 ( Sang Ill Park ),김용현 ( Young Hyun Kim ) 대한상하수도학회 2002 공동추계 학술발표회 논문집 Vol.2002 No.-

문제 영역에 관한 지식을 이용한 얼굴 인식

지은미(En Mee Jee),최형일(Hyung Ill Choi),이철희(Chul Hee Lee) 한국정보과학회 1990 정보과학회논문지 Vol.17 No.6

컴퓨터 비젼의 최종 목표는 모든 영상을 해석할 수 있는 시스템을 구현하는 것이지만 실제적으로는 이것이 불가능하므로 먼저 문제영역을 분석하고 여기서 얻은 지식을 이용하여 영상을 해석하는 접근 방법 [1]이 일반적이다. 본 논문에서는 컴퓨터 비젼의 응용분야중의 하나인 얼굴인식 시스템에 관하여 기술하였다. 먼저 얼굴 영상이 가지는 특징을 분석하여 사람의 얼굴 대부분이 좌측과 우측이 대칭을 이루고 있다는 것, 머리카락과 눈 부분은 가장 짙은 명암값(gray-value)을 갖고 있다는 것, 안면의 중심부위에는 코가 위치하고 그 밑에는 입술이 위치한다는 결론을 얻었다. 이렇게 얻은 문제영역에 관한 지식을 가지고 인물의 윤곽(outline), 머리카락(hair), 눈(eye), 코(nose) 그리고 입술(lips)등의 얼굴 구성요소(component)가 위치할 것으로 기대되는 최소 포함 사각형(MERs minimun enclosing)을 얻었다. Computer vision is the information processing task of understanding a scene from its projected images, but has been proven exceedingly difficult in general domains. Thus we often analyze a given domain and adopt approaches that can interpret associated imagery data using the knowledge obtained from this analysis This paper addresses a problem of extracting facial components. Through examining facial images, we obtained such domain-specific knowledge that a face is symmetric, hair and eyes have relatively dark gray-values, a nose lies at the center, etc. Using this knowledge, we extracted MERs (minimum enclosing rectangles) that represent proper portions of facial components like hair, eye, eyebrows, and lips.