廢紙纖維를 利用한 緩效性肥料가 콩의 生育, 收量 및 土壤에 미치는 影響

전하준,백준호,김태주 대구대학교 과학기술연구소 1997 科學技術硏究 Vol.4 No.3

The study was conducted to find out the effects of slow-released fertilizer(SRF) on the growth and yield of soybeans and in the soil. The plant height of soybeans was showed the higher in the SRF than in urea at early growth stage, but that showed the very similar results in both of SRF and urea at late growth stage. The chlorophyll content and photosynthetic activity of soybeans were higher in the SRF than in urea at 40days after sowing. Grain yield was not significantly different between in the SRF and in urea. Total nitrogen content in the grain and shoot of soybeans was showed higher in the SRF than urea. Nitrogen uptake in the grains of soybeans was similar results in both of the SRF and urea, but that of SRF in the shoot was higher than in urea. Efficiency of nitrogen in the SRF of soybeans was higher than in urea by 13.1%. Nitrogen content in the soil after experiment of SRF was lower than in urea.

人工酸性비가 大豆와 고추의 葉被害率과 葉綠素 含量에 미치는 影響

전하준,백준호 대구대학교 과학기술연구소 1996 科學技術硏究 Vol.3 No.2

This study was conducted to investigate the relationships between the responses of soybean and red pepper to simulated acid rain, the simulated acid rain(SAR) of pH 1.8, 2.3 and normal rain of pH 6.0 applied from 30 days after emergence of soybean and red pepper to harvest at the two-week interval. SAR of pH 1.8 and 2.3 caused brown spots in the Ieaves of soybean and red pepper and the injured rates were severe as the pH of SAR lowered. Chlorophyll content of soybean and red pepper decreased as the pH of SAR lowered. Visual injured rate affected by simulated acid rain treated 3 times were negatively correlated with chlorophyll content of soybean and red pepper.

국내 민간투자(SOC)사업의 효율화 방안에 대한 연구

이호경,김상철,윤준선,백준홍 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1

The purpose of this study is to examine the theoretical concept and practical example of Social Overhead Capital(SOC) project based on development of nation the world. Also, the critical access is to find the way we can develop domestic SOC project underway in private and nationwide. Furthermore, anther access is to propose clearly how to utilize BOT, BTO in financial, technical, CM method focusing on more systematic and effective result.

계층적인 탐색점 배치와 화소 간축을 이용한 움직임 추정 기법

박준호,류명춘,김준한,김신희 경운대학교 산업기술연구소 1999 産業技術硏究論文誌 Vol.1 No.1(B)

In motion estimation of moving pictures compression, fast block matching method using hierarchical search point displace and the pixel decimation is supposed. The method is based on TSS(Three step Search) method and pixel decimation. This method improves image quality and local minima by increasing search points, but operation counts that resulted from increasing search points are reduced by the pixel decimation method. So, the method can improve image quality and operation counts are nearly the same with TSS. MP@ML video is simulated by this method, which shows good results compared with TSS.

양극산화와 열산화 처리로 형성된 티타늄 산화막의 표면 특성과 생체활성에 관한 연구

박영준,송호준,이용렬 大韓齒科器材學會 2004 대한치과재료학회지 Vol.31 No.4

The purpose of this study was to evaluate the surface characteristics of titanium oxide films formed by anodization and thermal oxidation techniques, and to investigate its effects on formation of calcium phosphate. As experimental specimen groups, naturally oxidized film (AS-R), thin anodic oxidation film (ANO-L), thick anodic oxidation film (ANO-H) treated up to dielectric breakdown voltage, and thermal oxidation films of TH-L and TH-H treated at 530℃ and 800℃ in the air, respectively, were prepared. Surface characterization was performed using field emission-scanning electron microscopy (FE-SEM), X-ray diffractometry (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS) in order to evaluate the micro-morphology, crystalline structure, chemical composition, and binding structure of the oxide films. Bioactivity of specimen groups was investigated by evaluating the degree of calcium phosphate formation after immersing the samples in MEM for 7 days. The results were as follows: 1. Nanometer sized granular oxide particles were distributed on the surface of TH-L samples and sub-micrometer sized large crystallites were formed on TH-H samples. Irregularly shaped oxides were observed in ANO-L, and homogeneously porous oxide film having average pore size of about 0.5 ㎛ was formed in ANO-H. 2. Titanium oxide films having anatase crystalline structure were formed on ANO-L and TH-L sample surfaces. However, the preferred orientation crystal planes of ANO-L and TH-L were different to be (101) and (004) plane, respectively. Rutile crystalline structure was dominantly shown on TH-H sample, and anatase and rutile crystals were co-existed on ANO-H sample surfaces. 3. The amounts of hydroxyl group, which is related to the bioactivity of titanium implant, were higher in thermally treated specimen groups than in other groups. This result was analyzed to have close relation to the preferred orientation crystal plane and surface area of oxide films. The content of hydroxyl group increased as the density of surface titanium atoms increased, and that was least in specimen group having rutile and anatase crystalline structure in coexistence. 4. Immersion test in MEM showed that the capacity of calcium phosphate formation was dependent on total content of hydroxyl group and surface morphology of titanium oxides.

충남대학교 학술림 산책로 훼손실태 및 관리방안에 관한 연구

이준우,김명준,최윤호,전용준,오도교,김민호,이소연,이경형 충남대학교 농업과학연구소 2004 농업과학연구 Vol.31 No.2

This study concentrates an the trail of the CNU(Chungnam National University) forest. The amount of use and the pattern of damage are considered, as well as the extent of environmental damage. Finally, some managerial strategies are proposed in connection with sustainable maintenance. The trail of the university forest is composed of three sections; one is the neighborhood park and the Institute of Information Technology/Communications, the second is the Institute of Information Technology/Communications and the Dormitory, and the third section is the Dormitory and the Foreign prof's Apt. The total length of the trail is 2.6km. The daily amount of use is 1,269 visitors per day. The amount of using increased three times the amount of that in 1998. This study shows the pattern of damage of the trail in the order of root-exposure, widening, rock-exposure, deepening and the divergence in the frequency of occurrence of all these factors. Environmental damage is also graded thus: grade 3 is 27.4m, grade 4 is 0.8m, grade 5 is 1.5m, and grade 6 is 0.2m. Accordingly, some managerial strategies were proposed in connection with the sustainable trail maintenance.

Fuzzy 추론을 이용한 PWM Inverter에서의 고조파 저감에 관한 연구

朴俊烈,全光鎬 弘益大學校 科學技術硏究所 2001 科學技術硏究論文集 Vol.12 No.-

嶺南地域의 氣象環境 差異가 벼 生育 및 收量에 미치는 影響

백준호,전하준 대구대학교 과학기술연구소 1997 科學技術硏究 Vol.4 No.3

This study was conducted to find out effects of the growth and yield of 6 rice cultivars in inland, inland middle mountain, and eastern coastal area at different climatic environment. In Guryongpo, heading date averaged cultivars were delayed by 14 and 10 days compared with that of Kyongsan and Hwaseo. In Guryongpo, culm length averaged cultivars were the lower than that of Kyongsan and Hwaseo. Panicle length were smaller in the order of Kyongsan>Hwaseo>Guryongpo. The number of panicles per plant were greater in the order of Kyongsan<Hwaseo<Guryongpo, and the number of spikelets per panicle were smaller in the order Hwaseo>Kyongsan>Guryongpo. Percent of ripened grain and 1000-grain weight of Guryongpo were smaller than those of Kyongsan and Hwaseo. Brown rice yield were smaller in the order in Hwaseo(605kg/10a)>Kyongsan(560kg/10a)>Guryongpo(537kg).

하악골 골절 환자에 있어 수술후 합병증으로 발생한 골수염의 치험례

윤규호,전인성,신용길,박준호,허남오,방석준 大韓顎顔面成形再建外科學會 1996 Maxillofacial Plastic Reconstructive Surgery Vol.18 No.4

The term osteomyelitis literally means inflammation of bone marrow. It is described as an inflammatory condition of bone primarily engaging the medullary Following circulatory collapse and ischemia, the involved portions of the bone become necrotic. Cellulitis and osteomyelitis are the most frequent complications of fractures of the mandible and maxilla, because there is an abscessed tooth in the line of fracture. Since most fractures are compound fractures, infection may develop because of contact with oral secretions or outside air. The treatment of chronic osteomyelitis is still under debate. Some authors rely on antibiotics alone, while others advocate combination with surgery. But when infection occurs, establish proper drainage and administer antibiotics. Author treated a case of infected mandibular fracture with mandibular osteotomy, sequestrectomy, iliac bone graft and hyperbaric oxygen therapy, who had suffered suppurative osteomyelitis and mandibular nonunion following the open reduction of the mandibular fracture.

치과주조용 Ti-Zr-Cr계 합금에서 Cr 함량변화가 부식저항성에 미치는 영향

박영준,강후원,이용렬,송호준,김민강 大韓齒科器材學會 2004 대한치과재료학회지 Vol.31 No.4

The purpose of this study was to develop new dental casting titanium (Ti) alloys having an excellent mechanical properties and good corrosion resistance as a substitute for c.p Ti and Ti-6Al-4V alloy (control groups). Ti-20Cr, Ti-2OZr and Ti-20Zr-XCr (X=2, 5, 10, 15) alloys (experimental groups) were designed for dental casting Ti alloys. Prior to casting prccedure, mother alloys were prepared by using vacuum arc melting with skull melting method. Argon-arc melting and argon/vacuum-pressure casting machine were used for making the specimens. The hardness, microstructure, and corrosion resistance were evaluated by using Vickers microhardness measurement, FE-SEM, and anodic polarization test. The results were as follows: 1. The Vickers microhardness (Hv) of Ti and Ti-6Al-4V alloy showed the values of 210 and 352, and Ti-20Cr and Ti-20Zr alloys showed the values of 341 and 259, respectively. As the Cr content increased from 0 to 15 % in Ti-20Zr-XCr (X=0, 2, 5, 10, 15) alloys, the Hv increased from 259 to 298, 457, 344, and 351, respectively. The microstructure of Ti-20Zr-XCr specimens showed significant difference by the concentration changes of Cr content showing acicular crystalline structure for Ti-20Zr-2Cr and Ti-20Zr-5Cr, and equiaxed crystalline structure for Ti-20Zr-10Cr and Ti-20Zr-15Cr. 2. Open-circuit potentials (E_(∝)) were rapidly decreased followed by steadiness as time elapse in all experimental groups except in Ti-20Z group. Ti-2OZr group showed an increase in E_(∝), from the first. 3. In potentiodynamic anodic polarization tests, all experimental groups showed more noble corrosion potential (E_(corr) than that of Ti-6Al-4V, and more basic E_(corr) than that of Ti. Especially, Ti-20Zr-10Cr alloy showed most favorable corrosion resistance among Ti-Zr-Cr alloys. 4. For Ti-20Zr-10Cr, Ti-20Zr-15Cr, and Ti-20Cr groups, which have more than 10% Cr content, the secondary corrosion potential shifted to noble direction in larger amounts than in the cases of control and other experimental groups. From these results, it was concluded that newly formulated Ti-20Zr-10Cr experimental alloy have adequate hardness and high corrosion resistance, and this alloy is promising candidate for a successful dental casting alloy.