대구시 소방권역별 접근성 분석을 이용한 구조대 재편방안

정규동(Jung Gyu-Dong),홍원화(Hong Won-Hwa),최준호(Choi Jun-Ho),김광섭(Kim Gwang-Seob),이지수(Lee Ji-Soo) 대한건축학회 2012 대한건축학회논문집 Vol.28 No.9

In a fire situation, the priority is fast and safe rescue. Therefore, because of the importance of the role of rescue team, specify the criteria of equipments as act. But it can’t be helped appear vulnerable area according to the problems such as province fiscal conditions and budget. in this study suggest improvement considering the characteristics of the actual road and emergency vehicles through accessibility analysis. In the process of vulnerable area deduction, the area of service area is wider, the larger number of vulnerable buildings. And analyze that especially approximately 77% of the entire are vulnerable buildings. Jung-gu, Daegu, the center of the approach is only 3% of vulnerable buildings, but as a whole of Daegu, Within 5 minutes from the rescue team are difficult to access the building by about 30 percent. In order to improve it, Station of jurisdiction that need to be adjusted or additional installations proposed regional strategy for the reorganization. According to the proposed strategy to evaluate the improvement, vulnerable about the whole building from 140,000 to 70,000 could be reduced by half. Alternative to reduce the vulnerability of buildings according to the percentage reduction in overall approximately 30-16% can be reduced. If use the result of study, it will be able to set priorities of expansion of rescue team, and utilized to predict macroscopic vulnerable area in Daegu city.

콩 단백질/펙틴/몬모릴로나이트 나노복합 필름의 특성 및 산소 투과도 연구

정세환,김성철,조규순,신용섭,장상희,홍기헌,이태진,신부영 嶺南大學校 工業技術硏究所 2004 工業技術硏究所論文集 Vol.32 No.2

In this study, Mechanical property, thermal property, watervapor, and oxygen permeability of biodegradable Soy protein/Pectin-montmorillonite nanocomposite, prepared with Na^(+)-MMT, have been studied. X-ray diffraction and TEM experiments an polymer/silicate composite samples demonstrated that the intercalation of polymer chains leads to increase in the spacing between silicate layers. In addition, it were found that the intercalated Soy protein/Pectin/montmorillonite nanocomposite were prepared. It was found that the addition of only a small of clay was enough to improve the thermal stability and mechanical property of Soy protein/Pectin/montmorillonite nanocomposite. watervapor of Soy protein/Pectin/montmorillonite nanocomposite was generally lower than that of Soy protein/Pectin. oxygen permeability of Soy protein/Pectin/montmorillonite nanocomposite was generally lower than that of Soy protein/Pectin.

자동변속기용 압력조절밸브의 성능에 관한 연구

정규홍 대진대학교 1995 大眞論叢 Vol.3 No.-

In recent years, a great deal of research efforts have been made in order to improve shift quality of automatic transmission. Hydraulic control system and TCU (Transmission Control Unit) are recognized as two major parts which have an influence upon transmission performance including shift quality, efficiency, acceleration and so on. Therefore, stability and robustness of the hydraulic control system against flow disturbance are prerequisite to accomplish a high level shift quality. This paper deals with the control performance of the pressure regulator valve in automatic transmission. The effect of variations in operating points and design parameters is investigated in terms of computer simulation for the nonlinear dynamic system.

Method for Protection of Single‑Line‑Ground Fault of Distribution System with DG Using Distance Relay and Directional Relay

Jung‑Hun Lee,Min‑Su Park,Hong‑Seon Ahn,Kyung‑Won Park,Jun‑Seok Oh,Seung‑Gyu Jeon,Dong‑Kyu Kim,Jae‑Eon Kim 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.4

When large scales DG are connected to the distribution system of unidirectional power currents, bi-directional power currents are formed, making it impossible to use conventional overcurrent protection methods alone to detect and isolate fault sections for ground and short-circuit faults. To solve these problems, this study proposed the method of protection against single-line-ground fault of common neutral line multi-contact local power distribution system using distance relay and directional relay. The proposed protection method was applied to the common neutral multi-ground distribution system to validate the protection against single-line-ground fault through the PSCAD/EMTDC software package and efectively detect and isolate only the zone of single-line-ground fault without malfunctions.

CPLD를 이용한 3채널 PWM 신호발생기의 설계

정규홍 대진대학교 생산기술연구소 2000 생산기술연구소 논문집 Vol.3 No.-

In this research, Pulse-Width-Modulation signal generator of which carrier frequency and resolution is superior to the that of conventional peripheral functions of micro-controllers was designed with the combination of digital logic gate and 3-channels of PWM signal generators were implemented with the single Altera's EPM7128S CPLD. We established the model of digital logic circuit and verified its overall function with MAX+PLUS II software which is offered by Altera for digital logic design engineers. From the experiment of PWM signal test on the integrated hydraulic system control board, we can conclude that it works fairly good as we expected and since the speed of PLD is quite fast, there is no parallel-interfacing problem with the host micro-controller. 주요기술용어: Pulse-Width-Modulation(펄스폭 변조), CPLD(고집적 프로그래머블 논리소자)

17β-Estradiol의 심근 보호작용에 대한 연구 ; 재관류 부정맥을 유발한 동물실험

홍정석,김원,조규종,이미우,장성은,임경수 대한응급의학회 2001 대한응급의학회지 Vol.12 No.4

Background: Although reperfusion certainly prevents tissue ischemia from possible cardiac death, several lines of evidence suggest that reperfusion may paradoxically aggravate the frequency of serious reperfusion-induced lethal arrhythmias. It has been reported that acute administration of estrogen at physiological concentrations reduced with myocardial ischemic injury in women with coronary heart disease. In studies with canines, acute administration by either the intra-muscular or the intra-coronary route similarly prevented ischemia and reperfusion dysrhythmias and also reduced the infarct size because the estrogen increased the distal coronary perfusion pressure, scavenged free radicals and had other effects during both ischemia and reperfusion. However, the canine heart is notoriously well collateralized. 17β-estradiol induces very little vasorelaxation in cat coronary rings, suggesting that increased ischemic myocardial blood flow dose not contribute to the protective effect. In the present study, employing a cat model of regional cardiac ischemia, we examined whether reperfusion rendered after acute administration of 17β-estradiol could lower the incidence of reperfusion-induced lethal arrhythmia and the death rate. Method: Adult mongrel male cats(n=31, 2.7∼4.5 kg) were anesthetized under positive-pressure artificial ventilation with room air. Electrocardiograms were recorded. The animals of the control group(n=15) were subjected to 20-minute left anterior descending coronary artery(LAD) occlusion followed by abrupt reperfusion. The animals in the experimental 17β-estradiol(2 or 20 ㎍/kg) group were subjected to ischemia/reperfusion insult following drug treatment: 17 β -estradiol was applied intravenously within the 60 seconds just before LAD ligation followed by abrupt reperfusion. The Fisher's exact test was used to compare the data from different animal groups(p<0.05). Results: The number of arrhythmias(ventricular premature beat, ventricular tachycardia and ventricular fibrillation) emerging during the reperfusion phase were not statistically different from that in the control group. The death rate in the 17β-estradiol 20㎍/kg group was lower from that in the control group(P value = 0.039). Conclusion: Acute administration of 17β -estradiol at a supraphysiological concentration might produce cardioprotective effects, not by modificating the coronary blood flow into the threatened myocardial region, but by other mechanisms that directly or indirectly increase the intrinsic myocardial ischemic tolerance in the cat during the reperfusion phase.

폐수슬러지를 혼입한 콘크리트의 재료특성 및 강도특성

홍기호,하상훈,김정규,어석홍 國立 昌原大學校 產業技術硏究院 2004 産技硏論文集 Vol.18 No.-

The purpose of this study is to investigate the material characteristics and strength properties of concrete mixed with wastewater sludge, and to evaluate the leaching of environmentally harmful heavy metals from the wastewater sludge itself and from hardened concrete mixed with wastewater sludge. For this purpose, a reference mix with W/C ratio of 0.45 was used and the replacement proportion of wastewater sludge was varied with ratios of 0, 30, 50, 70 and 100% by volume of coarse aggregate in the reference mix. The variations of compressive and splitting tensile strength, workability and unit weight of concrete were considered. Test results showed that the strengths and unit weight decreased with increase in proportion of wastewater sludge replaced, but workability increased. Leaching test results showed that there would be no environmentally harmful problem from using wastewater as substitutes of coarse aggregates in concrete.

쓰레기 소각재를 잔골재로 혼합한 콘크리트의 기초적 물성연구

홍기호,하상훈,김정규,어석홍 國立 昌原大學校 產業技術硏究院 2004 産技硏論文集 Vol.18 No.-

The purpose of this study is to investigate the material characteristics and strength properties of concrete mixed with waste incinerated bottom ash(BA), and to evaluate the leaching of environmentally harmful heavy metals from the bottom ash itself and from hardened concrete mixed with bottom ash. For this purpose, two reference mixed with W/C ratio of 0.45 and 0.55 were used, and the replacement proportion of BA was varied with ratios of 0, 30, 50, 70 and 100% by volume of fine aggregate in the reference mixes. The variation of compressive and splitting tensile strength, workability and unit weight of concrete were considered. Test results showed that the strengths, workability and unit weight decreased with increase in proportion of BA replaced. Leaching test results showed that there would be no environmentally harmful problem from using BA as substitutes of fine aggregates in concrete.

자동변속기의 변속품질 향상을 위한 각가속도 피이드 백 제어 알고리즘

정규홍 대진대학교 1995 大眞論叢 Vol.3 No.-

In this work, the control algorithm in automatic transmission is proposed to improve the shift quality through the feedback of turbine angular acceleration. To design the control system, dynamic behavior of the RAVIGNEAUX type planetary gear system is analyzed both in torque and in inertia phase during gear change, and the relations between output torque and turbine angular acceleration are investigated.

휠로더 자동변속기용 속도센서 신호처리회로의 설계 및 분석

정규홍 대진대학교 생산기술연구소 1999 생산기술연구소 논문집 Vol.2 No.-

In this work, an appropriate seed signal conditioning circuit is designed on the basis of the characteristics of wheel loader speed sensor output voltage and the each electronic component which are obtained from experiment. We investigant the problems of the previous version of signal conditioning circuit for hall-effect sensors of passenger-car. From the experimental result, we could conclude that the newly designed signal conditioning circuit that is consists of high-pass filter and operational amplifier comparator is adequate for interfacing the wheel loader speed sensors to TCU.