웹 기반 건설 하도급 대금지불 프로세스 모델

노준오,이현종,구교진,현창택 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1

The purpose of this study is to improve the subcontract payment process in domestic Construction industry. This study researches the previous documents and payment processes of construction company so that improves subcontract payment process. Recently, subcontract increase with time in domestic construction industry. But many subcontract companies have difficulty in financing problems because of unreasonable practice. Requesting a payment, contractor and subcontractor make out a payment so their time and effort necessarily were spent. Therefore unnecessary things are removed in subcontract payment process so that settle a reasonable subcontract payment process.

PWM을 利用한 空壓Cylinder의 位置制御에 關한 硏究

朴鍾奉,盧尙鉉 慶一大學校 1990 論文集 Vol.6 No.1

A pneumatic position control system must have the velocity and acceleration feedback devices to improve the performance of the system, but theses devices cause not only to complicate the structure of a system but also to raise the cost of one. In this paper, the pneumatic position control system consisting of a microcomputer, a solenoid valve, a sing-rod cylinder, a PWM circuit, and an encoder which used as a position sensor is developed. The step input response of the developed system is measured experimentally.

생체용 Ti합금의 양극분극특성에 미치는 Zr 및 Pd의 영향

정종현,이길홍,최칠남,노학,백승남,이상열 대한치과기재학회 1999 대한치과재료학회지 Vol.26 No.2

The corrosion resistance of Ti-Zr-Pd-Cr alloys were investigated in order to reveal their possible use for new biomedical implant materials. Titanium alloys consisting of 10∼20%Zr, 0.0∼0.4%Pd and 0.15%Cr were prepared by vacuum arc-melting as alloying elements instead of using hardness Al and V in response to recent concerns about the long term safety of Ti-6%Al-4%V ELI alloys. The Ti-Zr-Pd-Cr alloys were heat-treated at 1000℃ for 2hrs under a vacuum atmosphere. The effect of Zr and Pd Ti alloys on the corrosion resistance for biomedical implant was investigating the anodic polarization curve at 37℃ in 5%HCI solution deaerated by high-purity N₂gas bubbling. The critical current density for passivation(I ) of Ti-Zr-Pd-Cr alloys didn't reveal markedly. Passive current density(I ) at 1.0V vs. SCE of this alloys decreased with increasing Zr in the contents from 10 to 20% and decreased with containing Pd in the range from 0.2 to 0.4%. Potential(E ) at 0.1A * m-² of this alloys increased with increasing Zr in the contents from 10 to 20% and increased with containing Pd in the range from 0.2 to 0.4%. For the Co-30%Cr-6%Mo alloy, passivity zone is narrow, and rapid increase of current density result from the low potential in comparison with Ti and Ti alloys. The corrosion resistance by the anodic polarization of Ti-20%Zr-0.2%Pd-0.15%Cr alloy was found to be superior to those of the Ti, Ti-6%Al-4%V alloy and Co-30%Cr-6%Mo alloy. The passive films formed on the Ti-20%Zr-0.2%Pd-0.15%Cr and Ti-6%Al-4%V alloys in the anodic polarization test consist mainly of TiO₂, Ti compound, ZrO₂, Al₂O₃and V₂O₃.

杜仲과 木瓜의 混合 煎湯液이 흰쥐의 卵巢摘出로 유발한 骨多孔症에 미치는 影響

李鍾安,盧昇鉉,安德均,崔湖榮 대한본초학회 2001 大韓本草學會誌 Vol.16 No.1

The purpose of this study is to examine the effects of Eucommiae Cortex and Chaenomelis Fructus on the aged ovariectomized rat, similar model with postmenopausal osteoporosis. The results of the experiment are as follows, 1. The body weight in OVX/ECCF group showed a increase.. 2. The level of S-AST and S-ALT in OVX/ECCF group significantly reduced. 3. Urinary volume and creatinine in OVX/ECCF group reduced.. The level of urinary deoxypyridinoline in OVX/ECCF group fignificantly reduced. According to the above results, this experiment indicates that OVX/ECCF group stimulated born formation and diminished the loss of born marrow, then recovered the failure of liver function on ovariectomized rat. In conclusion, an extract of Eucommiae Cortex and Chaenomelis Fructus showed preventive and curing effects in treating osteoporosis of ovariectomized rats. This result suggests that it can be used in preventing senile and postmenopausal osteoporosis. As for its effects, continuous clinical study is needed.

대장균의 GlnE 유전자 조절 부위의 염기서열 분석에 관한 연구

박종환,이영규,노연희,구자현 건국대학교 1996 學術誌 Vol.40 No.2

The enzymatic activity of glutamine synthetase (GS) which is a major enzyme assimilating nitrogen in enteric bacteria is modulated by a bicyclic cascade that consists in adenylylation / deadenylylation of GS and uridylylation / deuridylylation of a regulatory protein PII. The adenylylation of GS converts the enzyme to an inactive form. The cunverter enzyme for the adenylylation / deadenylylation cycle is adenylyltransferase (AT), a bifunctional enzyme. It is known that many of regulatory proteins of GS are affected by the nitrogen content in medium. In this study, glnE gene sequence from BamHI to Sali restriction site was determined to elucidate the possibility of its nitrogen sensing ability by searching the consensus sequence(WGCA) found in other nitrogen utilizing operons. The results are as follows ; 1) The nucleotide length of a part of glnE gene was 1203 dp and the initial codon ATG was determined by comparing the sequence with 13 amino acid residues from N-terminus of AT. 2) The probable consensus sequence TTGCA showing high homology with those of other nitrogen utilizing operons was found at 43 bp upstream region from the start point. Actual nitrogen sensing capability of glnE gene should be tested to find the complex regulatory mechanism of GS cascade system for further study.

생체용 Ti₁-x-Zrx합금의 기계적 성질과 내부식성

정종현,백승남,노학,고영무 대한치과기재학회 1998 대한치과재료학회지 Vol.25 No.1

While titanium and its alloys has been well studied for a long time, new interest in these materials and their properties has arisen in recent years with respect to their application as biomedical metallic materials. For practical purposes, the following performances are essential for biomaterials. (1) low specific gravity (2) high corrosion resistance (3) good biostability and biocompatibility (4) sufficient mechanical properties (5) non-toxicity To develop biomedical implant materials having all the properties mentioned above, new titanium-zirconium alloys were prepared in this study. Mechanical properties and corrosion resistance were then investigated for as-cast and as-homogeneized Ti₁_x-Zrx alloys in order to reveal their possible use for biomaterials. From the experiments, the following results are obtained: 1. No martensite structure are observed in the specimens made of pure Ti and Zr. In contrast them, Ti-Zr alloys containing 18wt%Zr, 24wt%Zr and 48wt%Zr show a kind of martensite structure regardless heat treatment. 2. Fineness of structures for as-cast-alloys seems to vary with alloy composition. Ti-Zr alloy containing 48wt%Zr shows the finest microstructure. 3. Hardness of Ti-Zr alloys shows continuous change through the system and the alloys containing 48 to 60wt%Zr indicate higher hardness compared with those of pure Ti and other alloys. It is well known that hardness is usually changed with substitutional atoms, and effect of solute atom on hardness is greatest with an equi-atomic composition. The greatest hardness which was obtained in Ti-Zr alloys containing 48 to 60wt%Zr is therefore reasonable. Also, enhanced hardness can be explained on elastic interaction between dislocation and substitutional solute atoms in crystal structure and on fineness of structure. 4. Pure Ti and Zr alloys containing 6wt%Zr, 12wt%Zr, 18wt%Zr, 36wt%Zr show better corrosion resistance compared with those of pure Zr, stainless steel(SUS 316L) and the Ti-Zr alloy containing 48wt%Zr. 5. Comparing hardness, microstructure and corrosion of Ti₁_x-Zrx alloys, no large differences between as-cast and as-homogenized alloys are seen.

화상전문간호사의 역할

김애심,노순예,신현선,전욱,김종현 대한화상학회 2003 대한화상학회지 Vol.6 No.2

Ultrasoft X선을 이용한 탄수화물분해효소를 고생산하는 Lipomyces Starkeyi 돌연변이 개발 및 특성 연구

전선미,정종,노은민,김현주,김도만 전남대학교 촉매연구소 2000 觸媒硏究 論文集 Vol.21 No.-

We have isolated a carbohydrase(dextranase and amylase; DXAMase) hyper-producing constitutive mutant from Lipomyces starkeyi JLC26 using ultrasoft X-ray irradiation obtained from Pohang accelerator laboratory(PAL). After partial purification of dextranase and amylase by membrane filtration, PEG, and DEAE-Sepharose column chromatography, the specific activities of amylase and dextranase were 3193 and 2822 unit/mg, respectively. The pH effects for activity and stability of both enzymes were similar to each other: Optimum pH and temperature for activity were at 5.5 and 50℃ and optimum ranges for stability were at pH 2.5-6.0 and 4-37℃, respectively. When the enzyme and maltotriose were reacted, glucose, maltose, isomaltose, maltotriose, panose and α (1→6) glucosylmaltotriose were produced by disproportionation reaction. When the enzyme and nigerose were reacted, glucose, nigerose, new product were produced.

지렁이를 이용한 슬러지 안정화시 부하율의 영향 및 슬러지 종류별 안정화 가능성 검토

서성철,박종안,이노섭,배형석,이종화,허준무,김준현 순천향대학교 기초과학연구소 1997 순천향자연과학연구 논문집 Vol.3 No.2

Stabilization of organic sludges using earthworms was conducted in a laboratory to investigate the effect of feed rate on the vermistabilization, and feasibility of vermistabilization of various sludge was also carried out to further wider application of vermistabilization. Sludges used in this study were septic tank sludge, papermill sludge and brewery sludge. Sludge reduction, cast production, earthworm growth rate and cocoon production were monitored periodically to check degree of stabilization. Feed rate of septic tank sludge did not have a notable effect on the sludge reduction and cast production per unit weight or earthworm. There was also no difference in the earthworm growth rate per unit weight of the sludge removed among the different sludge feed rate. The amount of septic tank sludge, papermill sludge and brewery sludge per gram of earthworm per day were 0.06, 0.05, and 0.02g, respectively. The weight of increase of earthworm per unit weight of the sludge removed was 0.18g/g for the septic tank sludge, 0.21g/g for the papermill sludge, and only 0.06g/g for the brewery sludge. It was therefore concluded that brewery sludge was not suitable for vermistabilization mainly due to high organic content to be easily converted organic acid. The concentrations of several heavy metals, volatile solids, total organic carbon and total kjeldahl nitrogen in the cast were generally lower than those in the raw sludges.

전기 화상 환자의 수술 전 평가,고압손상과 저압손상 비교

황정원,이정기,전영태,강종만,오용석,노규정,김현철 대한정맥마취학회 2004 정맥마취 Vol.8 No.1