준설토의 침강특성에 관한 연구

이광열,윤성현,홍진원,안용수 東西大學校 2001 동서논문집 Vol.7 No.-

Sedimentation of marine clays was tested by using cylindrical columns, and settling velocity and settlement were carried out to investigate the behavior of settling characteristics of dredged marine clay fills. Yano's method was applied to analyze both the settling velocity and settlement of marine clays. Four different initial water contents were used. From this study, it is found that settling velocity is significantly increased as increase of the initial water content for both column sizes, also, the test results indicated that column size remarkably affect the sedimentation of marine days.

CFRP Sheet 감싸기로 구속된 원형 콘크리트 기둥의 보강효과에 관한 연구

박상렬,김문관,고광민,홍성룡 제주대학교 해양과환경연구소 2006 해양과환경연구소 연구논문집 Vol.30 No.2

벼 육묘기 개발 및 육묘 실용성

박성태,김상열,황동용,홍연규 한국국제농업개발학회 2004 韓國國際農業開發學會誌 Vol.16 No.3

벼 농사에서 기계화가 어려운 육묘를 못자리 없이 간편하고 저비용으로 할 수 있는 육묘기 개발 및 개발 육묘기의 실용성 평가시험 결과를 요약하면 다음과 같다. 1. 개발 조립식 육묘기는 파종상자 치상선반, 플라스틱판, 부직포와 비닐로 만든 보온덮개로 구성되어 있고 35상자 육묘용 육묘기는 규격이 가로 152㎝, 세로 63㎝, 높이 147㎝이며 무게 75㎏이며, 육묘일수에 따라 육묘선반 간격을 간단히 조절할 수 있다. 2. 개발 육묘기를 이용 육묘시 묘소질은 관행 못자리 모와 비슷하고 결주율는 3.2%로 못자리 육묘상자모 2.8%와 거의 같았다. 3. 개발 육묘기는 대당 20만원정도로 기존 자동화 육묘시설 (198평:7,360상자 육묘기준 및 장비에 비하여 시설비가 43% 절감 된다. 4. 육묘 노력시간은 개발 육묘기는 ㏊당 7.9시간으로 자동화 시설육묘 및 못자리 육묘에 비하여 각각 18%, 76%절감 되었다. 5. 물 사용량은 개발 육묘기 이용 육묘는 ㏊당 2.5kl로 자동화 시설육묘 및 못자리 육묘에 비하여 6~8배 절감되었다. Raising seedling in nursery bed needs not only a lots of time but also labor input which are hard especially to the old and lady farmers. On the other hand, construction of seedling raising facilities such as automated seedling raising house also requires a lots of money. To overcome those problems, a simple seedling raising shelf, which is not necessary for preparation of the seedling raising nursery bed, was developed and its feasibility of seedling raising was evaluated. The dimension of the seedling raising shelf has 152㎝ in length by 63㎝ in width with 147㎝ in height. The shelf is composed of 6 to 7 layers of shelf frame, plastic tray for seedling raising, water supply pipes and white polyester cover. The height of a seedling raising shelf can be adjusted to 6 or 7 layers simply by changing the height of plastic pipes. One unit shelf can accomodate 30 to 35 seedling trays which can transplant about 1000 ㎡ rice field. The seedling height and dry weight of rice seedling grown in the shelf-type seedling raising apparatus was not significantly different from those seedlings grown in the conventional nursery bed. Missing hill percent-age of the seedling grown in shelf-type seedling raising apparatus was 4.3% similar to that of nursery bed of 4.3%. The seeding raising shelf has following advantages. The seedling raising shelf reduces cost of the seedling raising facilities by 43%, labor input hour by 18%, irrigation water saving by 83% versus automated the automated seedling raising house and labor saving by 76% and irrigation water saving as much as 6~8 times versus the conventional seedling raising method of nursery bed.

촉매-크래킹에 의한 나프타로부터 경질 올레핀 제조기술

박용기,전종열,한상윤,김정리,이철위 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.5

세계적으로 에틸렌 생산공장에서 배출되는 이산화탄소의 양은 매년 141백만 톤에 이르며, 석유화학산업에서 소비되는 전체 에너지 중 약 40%는 나프타 스팀크래킹에 사용된다. 이로인한 지구 온난화를 막기 위하여 에너지 효율 증대를 통하여 이산화탄소 배출양을 최소화할 수 있는 나프타 크래킹 기술개발이 시급하다. 또한 천연가스로부터 얻어지는 에틸렌의 양이 점점 증가하기 때문에 프로필렌/에틸렌 비를 증대하기 위한 연구가 필요한 실정이다. 그러므로 에틸렌과 프로필렌 수요를 맞추기 위한 thermal cracking의 대안으로 촉매를 이용한 크래킹기술이 시도되고 있다. 본 논문에서는 나프타로부터 에틸렌, 프로필렌 등과 같은 경질 올레핀 제조에 관하여 지난 수 년간 공개된 특허와 실용화 가능한 공정 기술을 소개하고자 한다. In the whole world, the amount of CO₂ emission from the ethylene plant is about 141 million tons per year, and currently about 40% of the energy in petrochemical industry is used for steam cracking of naphtha. So, global warming issues have stimulated the development of new cracking process of naphtha which can minimize CO₂ emission through the increase of energy efficiency. Also there is an effort to increase the ratio of propylene/ethylene in naphtha cracking since the natural gas cracker which can produce ethylene preferentially increases more and more. Therefore, catalytic cracking of naphtha has been studied as an alternative of thermal cracking to balance ethylene and propylene demand and to reduce CO₂ emission. This paper will review the various routes which have been investigated and applied over the past years, hut will focus particularly on the recently patented and commercially demonstrated processes for the production of lower olefins from naphtha.

土壤水分別 播種期와 窒素施肥方法이 율무의 光合成과 生育 및 엽고병에 미치는 影響

金容撤,李忠烈,崔仁洙,朴賢哲,金成萬,林銖三 밀양대학교 농업기술개발연구소 2000 農業技術開發硏究所報 Vol.4 No.1

In order to establish optimal seeding date and nitrogen fertilization of adlay in barley-dlay cropping system of south-eastern part of Korea, yield and its components of adlay grown under at 3 different seeding dates and 2 nitrogen fertilizations were compared and analyzed. In addition, edible nutriants of adlay grain were compared with rice and woheat, between upland and paddy cultivation, and among three cultivars. The results obtained are summarized as follow: 1.Heading date and maturity date was fasted later seeding date than early seeding. Days to heading was decreased as the seeding date was delayed. 2.Stem leagth, stem diameter and No. of tiller were increased irrigation than control(non-irrigation), and was decreased as the seeding date was delayed. 3.Top and root dry weight were increased moisture were decreased irrigation than control(non-irrigation), and was decreased as the seeding date was delayed. 4.Net photosynthetic rate was increased at treatment of irrigation. Key word : adlay, seeding daye, soil water content, photosynthesis, growth.

효율적인 모바일 서비스를 위한 하이브리드 스트리밍 아키텍처

이성용,최황규,최창열 강원대학교 정보통신연구소 2005 정보통신논문지 Vol.9 No.-

To provide the seamless multimedia streaming service for mobile users, both performance of the mobile device and bandwidth constraint of the wireless network should be considered. Recently, in order to solve these problems, the QoS adaptive architectures as well as additional features are being devised. In this paper, we designed and implemented a hybrid architecture-based mobile media streaming system under the Linux environment. The implemented system features as follows. First, a hybrid architecture which complements shortcomings of the static and dynamic architectures is presented. The hybrid architecture is able to maximize the proxy utilization rate by dividing the proxy into the related functions according to computation and disk access rate. Second, the new resource monitoring scheme that efficiently manages resource of the proxy is proposed. Third, the work prediction module is added to choose exactly the proxy which finish the task earlier than others. The experimental results demonstrate that our system decreases not only the user-perceived latency, but also the proxy overload. Furthermore, it has an advantage of reducing the traffic between the proxy and the system manager.

철근콘크리트 보에 대한 CFRP의 정착길이

한상훈,최만용,조홍동,박중열,황선일 충북대학교 건설기술연구소 2002 建設技術論文集 Vol.21 No.1

A failure mode in the beam strengthened with a high modulus plate appears as a interface debonding failure or ripping-off failure. This failure mode means that plate is separated from adhesive or concrete before displaying its own ability. Therefore, as a method for controlling a premature failure, it is need to use a general anchorage implement. We conducted bending tests for reinforced concrete beams strengthened with CFRP. The experimental variables were a concrete strength, reinforcement ratio, cover thickness of concrete and length ratio of CFRP for a pure span. A failure load, failure mode, load-deflection curve and strain response at different distances from a cut-off of CFRP and strain distribution curve were measured to determine the bond development length. Also, the bond development length was compared with Nguyen’s model and British Standard specification.

여성 요실금에서 Kontinence™와 Compact Elite™의 치료효과 비교

양상국,정상원,오미희,노용수,김홍섭,우응제,박승훈,이수열 건국대학교 의과학연구소 1999 건국의과학학술지 Vol.9 No.-

Biofeedback and pelvic floor electrical stimulation are new modalities that have been advocated for the treatment of female urinary incontinence. The aim of this study was to compare prospectively the therapeutic effect of Kontinence™(HMT Co., Korea) with Compact Elite™(ECL Co., France) in female urinary incontinence. All patients were evaluated with a complete history, physical examination, urinalysis, urine culture and urodynamic study. Eighteen patients were treated with Compact Elite™, and thirteen patients with Kontinence™. Enrolled patients had completed 8 office sessions consisting of biofeedback and intravaginal electrical stimulation according to the program of each machines. Overall treatment response was graded by patients on a scale of complete cure to aggravation. At two weeks after last session, overall improvement rate was 78% in Compact Elite™group and 92% in Kontinence™group(p>0.05). Overall patients' acceptability during treatment course was greater than 80% in both machines(p>0.05). There were no unexpected clinical findings during Kontinence™ treatment. After Kontinence™treatment, there were no laboratory changes including electrocardiography, complete blood count, liver function profile, and chest PA. These results showed that the biofeedback and electrical stimulation with Kontinence™was safe and moderately effective for female urinary incontinence comparable to Compact Elite™. However, long-term results of a larger patients are needed to ensure the therapeutic effect of Kontinence™.

우심방과 우심실의 거대 심장 혈관종 1예

김제열,조상호,김건일,허경림,김현숙,조구영,최영진,이원용,임종윤 朝鮮大學校 附設 醫學硏究所 2007 The Medical Journal of Chosun University Vol.32 No.2

Cardiac tumors, especially the primary tumors involving any part of the heart are extremely rare and its relative incidence has been reported to be approximately 0.02%. We report a patient with huge cardiac hemangioma who complained of shortness of breath, general weakness, and dizziness, Imaging study by echocardiography and computed tomography of thorax revealed a huge lobulating mass like a bunch of grapes in the right chamber of heart. The surgical exploration of thorax was performed and a histological diagnosis of spindle cell hemangioma was obtained by microscopy. The patient was treated by surgical resection of the tumor and doing well after surgery. Our experience indicated that prompt diagnosis and treatment of cardiac hemangioma is imperative for patients' prognosis.

풍력발전기 축소 구조 모델의 진동특성 연구

박무열,은성용,김석현 江原大學校 産業技術硏究所 2004 産業技術硏究 Vol.24 No.B

A reduced structure model of a wind turbine generator is designed and manufactured. Mode data are obtained by modal testing and analytical method. Vibration response is measured and investigated under various speed condition by using a waterfall plot. Possibility of severe resonance is observed and the mechanism is explained by using the mode data. Simplified theoretical model gives the 1st resonance frequency of wind turbine structure model. The theoretical model can be applied in the design stage of the wind turbine structure to avoid the severe resonance problem.