炭素鋼의 表面完成處理가 疲勞强度에 미치는 影響

鄭鳳秀 空軍士官學校 1967 論文集 Vol.2 No.-

This paper represents the results of an investigation of the effect of surface finishing treatments on the fatigue strength of tempered carbon steel at Rockwell hardness level of C-40. These tests revealed: (1) Peening and blasting treatment gave increased endurance limit as high as 55 to 65 Percent, (2) Fine finishing by mechanical means gave good results in the view point of fatigue, but surface roughness alone will not be a criterion of surface conditions influencing endurance limits, (3) This study gave further assurance of the results obtained from the previous study on Fatigue.

小型 燒却爐의 排氣가스 試驗

鄭鳳守 진주산업대학교 산업과학기술연구소 1996 산업과학기술연구소보 Vol.- No.3

小型 燒却爐의 排氣가스 試驗을 하기위한 燒却爐를 제작하여 本 校內에서 排出하는 쓰레기를 收去하여 不燃物質, 스티로폼등을 除去한 쓰레기의 組成狀態, 排氣가스의 性狀과 대책에 대한 結果는 다음과 같다. 1. 쓰레기 중 廢紙類 및 1회용 종이컵이 77.50%로서 前年度에 비해 1.99% 增加하였다. 2. 排氣가스중 空素 및 流黃酸化物을 적었으나, 酸化炭素 및 검댕이의 量이 많은 것은 合成樹脂 類 가 많이 포함될 경우에 나타났으며, 가능한 運轉管理 중 비닐, 플라스틱등 氷素발생량이 많은 合成樹脂物質은 별도 處理하는 것이 바람직하다. 3. 粉應의 排出量은 微細한 쓰레기를 投入할 경우에 많았으며 또, 쓰레기의 性質, 運轉操作, 押遂 送風의 位置와 分配方法에 따라 顯抵한 차이를 나타내었다. The purpose of paper is to analyze the exhaust gas of a small-size incinerator, and to suggest some improvements on it. The experimental subject was the refuse gathered in Chiniu National University. After the incombustibles and Styrofoams were removed from it, the composition of refuse and exhaust gas was analyzed. 1. Disuse papers and Dixie Cups occupied 77.5% of the total refuse, showing 1.99% increase compared with that of the last year. 2. NO_2 and SO_2 took up a comparatively small portion of the exhaust gas. CO and soot often accounted for a large part the gas. Synthetic resins such as vinyl and plastics were main cause of CO and soot. SO such materials are advised to be treated separately. 3. Small-size refuses produced a lot of dust. Such factors as the refuse nature, the incinerator operation, and the position and division of the pressure airing made a distinguished difference.

H.264/AVC를 위한 선택적 시간축 에러 은닉 방법

정봉수,최웅일,전병우,김명돈,최송인,Jung Bongsoo,Choi Woongil,Jeon Byeungwoo,Kim Myung-Don,Choi Song-In 대한전자공학회 2005 電子工學會論文誌-SP (Signal processing) Vol.42 No.2

본 논문은 H.264/AVC 비디오 비트스트림의 전송 에러 복원에 알맞는 선택적 시간축 에러 은닉 알고리즘을 제안한다. 제안 알고리즘은 손실 매크로블록이 전경인지 배경인지 판단한 결과에 따른 해당 에러 은닉방법을 수행한다. 손실 블록이 배경으로 판단된 경우에는 단순 대체 기법으로 은닉하며, 손실 블록이 전경으로 선택되었을 경우에는 다중 참조영상에서 추정된 블록들의 유사성을 판단하여 추정블록들을 선택적으로 평균하여 은닉을 한다. 제안된 알고리즘은 CDMA2000 (UMTS)망의 무선(air) 인터페이스에서 발생하는 에러 모의실험을 통하여 H.264/AVC의 FMO 부호화에서 H.264/AVC의 테스트 모델상의 에러 은닉 알고리즘보다 평균 1.18dB 성능 향상이 있으며, N-Slice 부호화에서는 평균 0.33dB의 성능 향상을 나타내었다 또한 주관적 화질면에서도 제안된 방법이 다른 에러 은닉 알고리즘보다 우수함을 보인다. In this paper, we propose a new selective temporal error concealment algerian best suited for H.264/AVC. The proposed algorithm performs selective temporal error concealment depending on whether the lost block is at background or foreground. It the corrupted macroblock is decided as at background, then the simple temporal replacement is performed. Also we propose replacing a lost block at foreground with the selective average of respectively estimated blocks from the multiple reference frames. This paper supposes error-corrupted H.264/AVC video bitstreams over CDMA2000 (or UMTS) air interface. It is shown that under Flexible Macroblock Ordering (FMO) coding of H.264/AVC, the proposed algorithm provides PSNR gain up to 1.18dB compared to built-in algorithm in the K264/AVC test model. In addition, the proposed error concealment method has average PSNR improvement of 0.33dB compared with that under N-slice coding mode. The proposed algorithm also provides better subjective video quality than other conventional error concealment algorithms.

有機廢棄物의 Composting에 관한 實驗的 硏究

鄭鳳洙,許南秀 진주산업대학교 1984 論文集 Vol.22 No.-

This study has been carried out to investigate the condition to the change of ventilating amount and moisture content and the most suitable condition of each factor that organic matter in wastes is composting with small experimental apparatus during a week, The results of the study indicate the following conclusions: 1. At the moisture in the range of 40­70% the mean moisture content during discharge is showed the low value of 4.8% and it is considered that the most suitable moisture content is proper in the range of 55­65%. 2. At the ventilating amount in the range of 0.05­3.5ℓ/min. ㎏­vm, anaerobic condition at 0.05ℓ/min. ㎏­vm is unable to make rapid composting and at 3.5ℓ/min. ㎏­vm is able to make rapid composting to have weight loss of 3.3% because of moisture evaporation with excessive ventilation. 3. In the proper condition, the most suitable ventilating amount is in the range of 0.7­2.0ℓ/min. ㎏­vm and the highest temperature is 70℃. 4. pH value of each matter in the range of 4.7­8.0 and pH value during discharge is generally showed high value. 5. The sawdust with pH value at 4.7 is not become rapid composting because of slow temperature rising and the proper pH value is in the range of 7­8. 6. C/N ratio of each matter is showed in the range of 30­110 and generally its proper range is about 60. 7. The activity of microbes is the most active in the range of 45­50℃.

블록 크기 활동도를 이용한H.264/AVC 부호화 고속 모드 결정

정봉수,전병우,최광표,오윤제 대한전자공학회 2007 電子工學會論文誌-SP (Signal processing) Vol.44 No.2

H.264/AVC uses variable block sizes to achieve significant coding gain. It has 7 different coding modes having different motion compensation block sizes in Inter slice, and 2 different intra prediction modes in Intra slice. This fine-tuned new coding feature has achieved far more significant coding gain compared with previous video coding standards. However, extremely high computational complexity is required when rate-distortion optimization (RDO) algorithm is used. This computational complexity is a major problem in implementing real-time H.264/AVC encoder on computationally constrained devices. Therefore, there is a clear need for complexity reduction algorithm of H.264/AVC such as fast mode decision. In this paper, we propose a fast mode decision with early P8x8 mode rejection based on block size activity using large block history map (LBHM). Simulation results show that without any meaningful degradation, the proposed method reduces whole encoding time on average by 53%. Also the hybrid usage of the proposed method and the early SKIP mode decision in H.264/AVC reference model reduces whole encoding time by 63% on average. H.264/AVC의 인터 부호화 기술은, 정교한 움직임 보상 부호화를 위해 다양한 블록 크기의 7가지 모드를, 그리고 인트라 부호화 기술은 2가지의 블록부호화 모드를 사용한다. 이러한 정교한 부호화 기술은 기존 표준에 비해 높은 부호화 효율을 제공하지만, 비트율-왜곡 최적화 기법을 사용할 경우, 많은 계산량을 요구하므로 연산량이 제한된 장치에서는 실시간 구현에 문제점이 발생한다. 따라서 H.264/AVC 부호화 표준의 실시간 구현을 위해서 계산 복잡도를 줄이는 고속 모드 결정법이 필요하다. 본 논문에서 제안한 LBHM(Large Block History Map)을 이용한 블록 크기 활동도 기반 고속 모드 결정 기법은 발생 확률이 낮은 P8x8 모드를 조기에 생략하여, 부호화 효율의 감소는 최소화 시키면서 H.264/AVC의 전체 부호화 시간을 평균 53% 감소 시켰으며, H.264/AVC 참조 모델의 조기 SKIP 모드와 같이 사용할 경우, 전체 부호화 시간을 평균 63% 이상 감소시켰다.

Speed SPrayer의 藥劑撒布에 關한 試驗

鄭鳳守,李永日 진주산업대학교 1975 論文集 Vol.13 No.-

Swath spray의 노즐의 種類別 藥劑撒布試驗結果를 보면 다음과 같다. ① 農藥撒布는 가능하면 無風時에 行하여야 하며 不可避한 겨우 最小 風向角 30°미만으로 維待해야한다. ② 作業能率에 있어서 動力噴霧機는 人力噴霧機에 比해 약 10倍 미스트機는 4倍의 能率이 높다. ③ 유효살포거리는 4頭口 노즐이 9∼12m 2頭口 노즐이 14∼16m 1頭口 노즐이 16∼19m로서 단변 30m인 논에서는 畦件撒布가 可能하다. The results about the experiments of the chemica1 spray and the numbers of the nozzle 1. It must let you spray dowon-wind, but if heavy-wind exists you must set the sprayer are as follows to keep below the angle of 30 degrees of the direction of the wind. 2. In the ability of spray the power-sprayers work about 10 times than hand-sprayers do and the mist sprayers to 4 times than they do. 3. In the available distance of spraying on the roadside and fence-row, you set the sprayer to keep four nozz1es once from 9 to 12 m width coverage, two nozzles once from 14 to m and one nozzle once from 16 to 19 m. so, it is availlable to spray in case of 30 m with of the paddy field.

폐쇄성 대장암의 임상적 고찰

정봉수,이동희,이인택,김창남,유창식,김진천 대한외과학회 1997 대한외과학회 학술대회 초록집 Vol.1997 No.11

하수오니에 왕겨 및 톱밥을 혼합한 호기성 퇴비화

정봉수,강용태 한국농공학회 1986 한국농공학회논문집 Vol.28 No.3

This study was carried out to investigate the effects of moisture content, temperature, C/N ratio and pH of the sewage sludge mixed with hulle and sawdusts for making compost under aerobic condition and to improve the defect of the structure of experimental equipment heat lose and handling method. and obtained results were as follows 1.The temperature was reached 73$^{\circ}$ C around 50 hours fermentation in the condition of 0.8 L/min. of air and 60.4% of moisture content. and favorable moisture content of initial condition ranged from 50 to 65% 2.The temperature near bottom of the batch composter was decreased due to evaporate water vapor and lose the heat produced during aeration. and it is required to be improved. 3.The temperature in the batch composter from the center to the inside wall surface was gradually decreased. the temperatures of the points located in r=9cm and the wall surface were 4$^{\circ}$ C and 6$^{\circ}$ C respectively. and therefore it is required to be insulated. 4. The maximum C02 production was obtained as 7.3% per volume in the temperature of 63$^{\circ}$C at the moisture content of 60% 5.The temperature range of active microbes growth was found to be as 20$^{\circ}$C to 40$^{\circ}$C in the case of mesophiles and 50$^{\circ}$C to 65$^{\circ}$C in the case of thermophiles due to increase and decrease C02 production. 6.C/N ratio after decomposition was 1.3 to 2.6 smaller than that of initial one due to increase the amount of nitrogen. The more C/N ratio increased. the less the reaction velocity decresed. The optimum of it as found to be 30. 7.pH values after decomposition were slightly increased than that of initial ones. The reaction velocity was decreased at acid and alkall condition. Therefore it is neseseary to neutralize the medium to improve the reaction.

現代科學의 限界와 意識의 轉換

정봉수 한국정신과학학회 1995 한국정신과학회 학술대회 논문집 Vol.3 No.-

20세기의 과학은 과학만능이라고 할 만큼 실로 눈부신 발전을 해왔다. 그러나 이러한 만능의 현대과학도 지구가 안고 있는 심각한 문제들을 해결하지 못하고 있다. 생태계의 파괴, 환경의 오염 및 자원의 고갈등 지구는 문자 그대로 존망의 위기에 처해 있다. 과학이 인류에게 편리성과 쾌적성을 가져와 행복한 삶을 약속해야 함에도 그러지 못할 뿐만 아니라 오히려 더욱 어려운 국면으로 몰아가고 있는 것은, 현대과학이 눈에 보이는 물질만을 대상으로 하는 결함과학이기 때문이다. 환경문제는 대부분 에너지 문제와 관련되어 있어, 에너지 문제만 해결된다면 대부분의 환경 문제는 해결된다. 석유, 석탄의 화석 연료와 원자력을 대신할 획기적인 새 에너지는 환경에도 좋을 뿐만 아니라 깨끗하고 안전하며 값도 싸며 우리 주변에 무진장 있다. 그러한 이상적인 새 에너지는 우리의 의식 개혁으로 개발 가능하다.

土性別 含水率이 碎土率에 미치는 影響 : 動力耕耘機의 로우터리에 關하여 A survey on the Rotary of the Power Tiller

鄭鳳守 진주산업대학교 1981 論文集 Vol.19 No.-

A study has been conducted to investigate the amount of soil lumps according to a change of the percentage of moisture contents and the Harrwoing rates of various soils using 10 PS power tiller. The results of this field test were obtained as follows: 1) The Harrowing rates of various soils of which soil lmps sized less than 1cm in diameter showed 21% in sandy loam, 18.2% in clay loam and 13.2% in clay loam when with working speed of 0.4m/sec in soil moisture contents of 19.8%. 2) The amount of soil lump attached to the harrow with soil moisture contents of 19.8% showed 1.893kg in sandy loam and 2.377kg in clay loam, 3.026kg in clay. 3) The amount of soil lump attached to the harrow with soil moisture contents of 22% were increased remarkably. 4) The amount of soil lump attached to the harrow with soil moisture contents of 22% showed 1.857kg in the top, 1.357kg in the either side 0.725kg in the hind part, 0.385kg in a hind wheel according to every part of Rotary.