• 한국재난관리표준학회지
• /
• 제3권2호
• /
• pp.65-71
• /
• 2010

본 연구는 우리 조상의 소중한 목조 문화재가 화재로 인해 소멸되는 것을 방지하기 위하여 화재진압 방법 중 하나인 가스소화설비를 이용하여 목조문화재 적심부의 화재진압 방법에 관한 것이다. 목조문화재는 적심부로 연소 전이시 진압이 매우 곤란하기 때문에 적심부 연소시 파괴를 수반하지 않는 화재 진압은 불가능하다. 스프링클러설비 등과 같이 현대 건축물에 설치되는 소방시설은 소화효과는 높은 반면에 설치와 작동에 따른 문화재 손상의 우려가 높아 목조문화재에 대한 적용성이 낮으므로 이러한 문제점을 최소화하면서 소화효과를 거둘 수 있는 소화설비 개발의 필요성을 제기하였고 타당성이 입증된 시험결과를 토대로 설치방안의 필요성을 제시하였으며, 적심부는 한국 고유의 건축방식으로 외국에 유사사례를 찾아 볼 수 없어 고정소화장치 개발을 통한 화재진압의 신속성과 효율성을 제고한 가스계 소화설비 소화방법을 개발하여 문화재의 손상을 최소화하면서 효용성을 검증하기 위한 실험을 연구하였다. 연구내용으로는 연구 실험 모형틀을 제작하여 소화방법을 수립, 소화시설을 설치하여 1차로 개판 천공 주수공 설치의 화재진압 효과성을 실험하였고 2차로 개판 천공 소화가스 주입구 설치의 화재 진압 효과성을 실험하였으며 그에 따라 숭례문과 유사한 목조 문화재의 경우 지붕의 적심부가 화재진압의 성패를 결정함으로 향후 유사사건의 발생시 신속하고 효율적인 화재진압을 위하여 소화방법에 관한 의견을 제시하였으며 그에 따라 목조 건축물(문화재) 진압대책 수립을 위한 객관적 데이터를 확보하였고 가스계 고정소화설비의 설치를 통한 문화재 방화대책 효과의 과학적 검증을 제시하였다.

• Advances in Traditional Medicine
• /
• 제5권4호
• /
• pp.301-307
• /
• 2005

The roots of the plant Korean ginseng have been extensively used in the traditional Chinese herbal medicine. We investigated the standardized extract of Korean ginseng on animal models of anxiety based on exploratory behavior. Korean ginseng extract (KGE) (3, 10 and 30 mg/kg) was administered intra-peritoneally. The anxiolytic activity was studied using elevated plus maze (EPM) paradigm, light/dark apparatus (LDA), open field apparatus (OFA) and the hole board apparatus (HBA). Diazepam (1mg/kg) was used as a standard anxiolytic drug. In EPM, KGE (10 mg/kg) significantly (P < 0.05) increased the time spent in open arms and the number of entries in open arms. In LDA, KGE (10 mg/kg) increased the number of transitions. In OFA, KGE (3 and 10 mg/kg) significantly increased (P < 0.05) the number of squares traversed. In HBA the number of head pokes were significantly increased with KGE (3 and 10 mg/kg). KGE at all selected doses did not affect the motor coordination. Thus, the study suggests that saponin containing standardized Korean ginseng extract possess anxiolytic activity.

• 한국지반공학회지:지반
• /
• 제6권1호
• /
• pp.7-14
• /
• 1990

주동단에 반력스프링이 부착된 공진주(spring-top resonant column) 시험기 주동단 불완전 고정의 영향을 연구하기 위해 2자유도 모델을 제안하였다. SYMPHONY스프레드쉿트를 이용하여 무차원주파수, F를 구할 수 있도록 전산화하였으며 이로부터 탄성계수를 구할 수 있다. F에 대한 반력 질량의 영향은 반력질량 및 시료의 질량 및 주파수에 관계되는 계수, T<20인 경우에 는 무시할 수 없음을 밝혔다. 시험기 및 시료의 질량과 주파수에 관계되는 계수, Tci가 증가함에 따라 F의 영향 역시 증가하였으나 T도 20인 경우 그 영향은 적었다. 주동단 고정을 위해서는 T, 이 20이상 되어야 함을 제안하였으며 이 경우 SDOF으로 취급할 수 있다. 시료와 시험기의 감쇠비는 F에 크게 영향을 미치지 않음도 밝혔다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1995년도 하계학술대회 논문집 C
• /
• pp.1394-1397
• /
• 1995

In the hazardous areas where explosive gases, vapor or mists exist, electrical apparatus and installations must be of explosion-proof construction to prevent or limit the danger of the ignition of potentially explosive atmosphere. In Korea, nine types of protection have been specified in the government regulations at present: flameproof enclosure, pressurization, oil immersion, increased safety, intrinsic safety, non-incendive, sand filling, encapsulation, and special types. Among these types, the intrinsic safety has the construction which limit or by-pass igniting the electric energy using electronic devices. This type has lots of merits but at the same time requires a high-degree of technology. In this paper, we investigated several dominating factors which affect the minimum ignition energy: this energy plays a very important role in design and evaluation of the intrinsic safety type electrical apparatus. Eletrode material, which is one of the most important factors, was intensively studied for the five sorts of material(Al, Cd, Mg, Sn, and Zn) with performing experiment in a low-voltage inductive circuit using IEC-type spark apparatus. The experimental results show that the minimum ignition energy of electrode material is varied: highest in Cd and lowest in Sn. We also confirmed the effect of eletrode make-and-break speed and magnetic field magnitude.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1995년도 하계학술대회 논문집 C
• /
• pp.1299-1303
• /
• 1995

The detection and measurement of partial discharge activity prevalent in the solid insulating systems of high-voltage generator stator windings has, for many years, been a recognized method of assessing the insulation condition of such systems. Partial discharge activity occurs at sites of degradation within, or at the surface of, stator's insulation systems under high voltage stressing. However, partial discharge pulses suffer from attenuation and distortion when transmitted along windings, because of the complex L-C network between windings. The mode of transmission varies with the signal frequency and is dependant on the geometrical configurations of windings. This paper reports the investigated results of the signal propagation characteristics along the windings when both sinusoidal signals and simulated partial discharge pulses are injected at the various positions of stator windings within the 25 MVA, 11 kV hydro generator. The on-line identification technique of partial discharge location in generator windings is also proposed in this study.

• Ocean Systems Engineering
• /
• 제4권4호
• /
• pp.309-325
• /
• 2014

Geotextile tubes are basically a huge sack filled with sand or dredged soil. Geotextile tubes are made of permeable woven or non-woven synthetic fibers (i.e., polyester or PET and polypropylene or PP). The geotextile tubes' performances in strength, dewatering, retaining solid particles and stacked stability have been studied extensively in the past. However, only little research has been done in the observation of the deformation behavior of geotextile tubes. In this paper, a large-scale apparatus for geotextile tube experiment is introduced. The apparatus is equipped with a slurry mixing station, pumping and delivery station, an observation station and a data station. For this study the large-scale apparatus was utilized in the studies regarding the stresses on the geotextile and the deformation behavior of the geotextile tube. Model tests were conducted using a custom-made woven geotextile tubes. Load cells placed at the inner belly of the geotextile tube to monitor the total soil pressure. Strain gauges were also placed on the outer skin of the tube to measure the geotextile strain. The pressure and strain sensors are attached to a data logger that sends the collected data to a desktop computer. The experiment results showed that the maximum geotextile strain occurs at the sides of the tube and the soil pressure distribution varies at each geotextile tube section.

• 전기학회논문지
• /
• 제61권2호
• /
• pp.194-198
• /
• 2012

This paper describes flying inspection apparatus for 22.9kV distribution line. This apparatus is composed of multi-copter(more than 4 propellers), camcorder and remote controller. The existing inspections, such as hot-line inspection job and optical inspection method and distribution Line Checking Robot, have many restrictions. A electric working vehicle and hot-line job license are essential in hot-line inspection job. Besides its high cost, it can't be applied to the electric pole over 18m and road-blocked area. Optical method can't inspect upper side of electric facilities mounted on the electric pole. Robot method can't be applied to the corroded overhead earth wire and nothing of overhead earth wire. To solve the problems, in Korea Electric Power Co., we have applied flying inspection apparatus to the 22.9kV distribution line. The results of trial application show that this paper is practical and effective for the inspection technical method in 22.9kV distribution line

• 한국결정성장학회지
• /
• 제1권1호
• /
• pp.17-25
• /
• 1991

The construction details of VGF apparatus with a DM(direct monitoring) furnace for the growth of low defect crystal and characteristics of GaAs crystal grown by this apparatus are described. The average dislocation densities and EL2 concentration of as-grown undoped GaAs along the different solidified fractions exhibit $4{\times}10^{2}-7{\times}10^{3}cm^{-2}$ and $6{\times}10^{14}-4{\times}10^{15}cm^{-3}$, which are less than those observed for liquid encapsulated Czochralski(LEC) or high-pressure vertical gradient freeze(VGF) crystals. These remarkable reduction of the dislocation densities and EL2 concentrations were explained by the lower temperature gradient ($dT/dx-10^{\circ}/cm$) and slower rates of post - growth cooling ($20^{\circ}C/hr:1240-1000^{\circ}C,\;30^{\circ}C/hr:1000-700^{\circ}C$). Also, The Hall mobilities, carrier concentrations show uniform distribution throughtout 80% of the ingot length.

• 동력기계공학회지
• /
• 제13권6호
• /
• pp.63-69
• /
• 2009

The experiment was performed to check operating characteristics of fouling auto removal apparatus for multi pass type heat exchanger using ejector. The results showed as following. The ejector suction flow rate increased with the head of operating pump of ejector. Proper suction flow rate showed $7.2{\sim}10.2m^3/h$ for ball collection in case of pump head 35~50m. The head of ejector outlet pipe is below 4.1m in case of 40m, the head of operating pump of ejector to confirm ejector suction flow rate 8.4m3/h. Lattice space of ball separator is allowed 6~10.3mm in ranges of ball diameter are 15~25mm and when mass flow of cooling water is 3.0m/sec. Average of passing time of balls is 1.2~2.8sec depend on the velocity of flow and the size of balls.

• 한방안이비인후피부과학회지
• /
• 제21권2호
• /
• pp.112-119
• /
• 2008

Objective : The quantification of pulse diagnosis is an important subject utilizing as a modernization of Oriental medical diagnosis and as a basic data for collaborative access between East and West Medicine. This study was to observe the tendency of pulse diagnosis in atopic dermatitis patients as measured by pulse diagnostic apparatus. Methods : We did pulse diagnostic test about 11 new outpatients who had visited the department of ophthalmology, otolaryngology, dermatology in Kyunghee oriental medical center from March 1, 2007 to October 31, 2007 and had atopic dermatitis. Results : The results were as follows. 1. Among the 11 outpatients, the total number of male patients were 5 and female patients were 6, and the age distribution, the most frequently visited age groups were 10-19 years old and 20-29 years old(each 4 patients). 2. The most common period of onset to first examination were 3 years${\leq}$ (7 patients). 3. There were 8 patients who had emphasized T-wave. 4. There were 7 patients who had repeated pulse wave pattern. Conclusion : In 11 cases who had atopic dermatitis, 8 patients had emphasized T-wave and 7 patients had repeated pulse wave pattern.