외국인 여행객을 위한 예약시스템 구축에 관한 연구

황보승 관광경영학회 2002 관광경영연구 Vol.16 No.-

There is increasing number of individual tourists compare to group tourists in bringing fordign tourists in Korea. It is required to develop new tour reservation system to fulfill individual tourists needs with easy accessibility. Compared to existing inbound tour companys system. This study forecasts the trend of new reservation system as follows: 1. Recruiting tourist through direct sales 2. Improving price structure from dumping price to set price

개구를 갖는 함체의 외부 다이폴 파원에 의한 침투전계와 공진 주파수 특성

황보승,김기채 한국전자파학회 2001 한국전자파학회논문지 Vol.12 No.6

본 논문에서는 외부 다이폴 파원에 의해 합체의 개구를 통하여 침투하는 침투 전계와 함체의 공진 주파수 특성을 검토하고 있다. 이론해석 방법으로서는 외부 다이폴 파원의 전류분포 및 함체에 있는 개구의 개구면 전계분포에 관한 연립 적분방정식을 Galerkin의 모멘트 법으로 해석하고 있다. 이론해석의 결과, 침투전계는 개구면 부근에서 가장 크며, 함체의 공진 주파수는 개구가 없는 경우의 공진 주파수와 거의 일치하므로 함체의 크기가 결정되면 공진 주파수의 추정이 가능하다는 것을 알 수 있었다. 이론해석의 타당성을 화인하기 위하여 함체의 내부 전계 및 공진 주파수의 실험치와도 비교하고 있다. This paper presents the penetrated electric fields and resonant frequencies inside a metallic enclosure with aperture excited by an external dipole source. In the theoretical analysis, integral equations for the current distribution and electric field distributions on the aperture are solved by applying Galerkin\`s method of moments. The results show that the electric fields inside metallic enclosure is maximum at the near the aperture and resonant frequencies are the same as calculated of the enclosure without aperture. To verify the theoretical analysis the electric field inside enclosure and resonant frequencies are compared with the experimental results.

펄스정전응력법(PEA)을 이용한 고분자 재료애 따른 공간전하분포와 전도전류 특성

황보승 호남대학교 1999 호남대학교 학술논문집 Vol.20 No.2

The purpose of this paper is to evaluate the effects of space charge on electrical characteristics in polymer insulators, which has been studied by many researchers in the world recently. In this paper, we have manufactured new measurement system which measured simultaneously both space charge distribution and conduction current. By using this system, we have analyzed the effects of space charge on conduction characteristics of polymer insulators such as XLPE and WTR-XLPE under DC voltage. We could find that the characteristics of polymer insulators have good correlation with space charge distribution in polymer insulators.

경제적 형광등 교체를 위한 표시장치 개발에 대한 연구

황보승 호남대학교 산업기술연구소 1999 산업기술연구논문집 Vol.7 No.-

본 논문에서는 현재까지 광원의 주류를 이루고 있는 형광등에 의한 불필요한 전력소모를 억제하고 전기요금을 절약하기 위한 최적의 형광등 교체주기 표시에 대한 연구를 수행하였다. 이를 위하여 본 연구에서는 시간경과에 따른 형광등 노화에 의한 소모전력의 증가와 그에 따른 경제성을 분석하였으며, 이를 바탕으로 최적의 교환시기가 되면 자동으로 적색 LED가 소등(또는 점등)되는 장치를 설계 및 개발하였다. 또한 P-spice를 통한 회로 해석과 실험을 통하여 개발된 장치의 정상적인 동작을 확인하였다. In this paper, in order to restrict the power consumption and save electric charges due to the fluorescent lamp which is still main lighting source, we have carried out the studies on the indicating the optimal replacement time of it. For these purposes, we have evaluated the increment of power consumption of the fluorescent lamp and its economical efficiency due to degradation according to elapsed time. On the basis of the evaluation, we have designed and developed the system that turned off(or on) the red LED at the optimal replacement time. We also verified correct operations of the developed system through the circuit simulation by P-spice and experiments.

펄스정전응력법을 이용한 고분자 재료에서 공간전하분표 측정에 대한 이론적 고찰

황보승 호남대학교 산업기술연구소 1998 산업기술연구논문집 Vol.6 No.-

본 논문에서는 최근 국 ·내외적으로 활발하게 연구되고 있는 고체 고분자 재료 내의 공간전하 측정법과 관련하여, 공간전하의 비파괴 측정법 중의 하나인 펄스정전응력법(PEA 법)에 대한 이론적 고찰을 수행하였다. 또한, 두꺼운 압전소자를 이용해서 PEA 법의 공간분해능을 향상시킬 수 있는 새로운 방법을 제안하였다. In this paper, we have evaluated theoretically the PEA method which is one of the most popular methods for the nondestructive measurement of space charge distribution in polymers. On the basis of this theoretical evaluation, we also suggest a new measuring method that uses a thick piexo-material for improving the space resolution of PEA method.

펄스정전응력법에 의한 XLPE에서 DC 과전에 의한 공간전하의 교류전압에서의 거동관찰

황보승 호남대학교 2000 호남대학교 학술논문집 Vol.21 No.2

In this paper, in order to evaluate quantitavely the formation mechanism of space charge by DC application and the behavior of pre-formed space charge at AC volatge in XLPE, We have modified the PEA method to measure simultaneously discharging (or leakage) current and space charge distribution under DC and AC. By using this system, we have analyzed the effects of pre-formed space charge accumulated by DC stress on AC in XLPE (560 ㎛) when there is no air gap between electrode and XLPE. Form the experimental, it was found that, DC conduction current decrease because of the effects of potential barrier at interface and most of pre-formed space charges still remained when AC voltage was applied up to 8kV. Thus the field distortion and localization due to pre-formed space charge is very important under AC voltage and may cause a critical damage on the AC insulating characteristics of insulator, especially in AC long-term service.

초고강도 베이나이트강의 미세조직과 기계적 성질에 미치는 탄소함량과 항온열처리 온도의 영향

황보승,이홍범,송영범,함진희,김홍규,서동우 대한금속·재료학회 2019 대한금속·재료학회지 Vol.57 No.6

The effect of carbon content and isothermal heat treatment conditions on the microstructure evolution and mechanical properties of ultra-high strength bainitic steels was investigated. A reduction in carbon content from 0.8 wt% to 0.6 wt% in super-bainite steel with typical chemistry effectively improved not only the Charpy impact toughness but also the strength level. This suggests that reducing the carbon content is a very promising way to obtain better mechanical balance between strength and impact toughness. The higher Charpy impact toughness at a lower carbon content of 0.6 wt% is thought to result from a reduction in austenite fraction, and refinement of the austenite grain. The coarse austenite grains have a detrimental effect on impact toughness, by prematurely transforming to deformation-induced martensite during crack propagation. Mechanical properties were also affected by the isothermal treatment temperature. The lower isothermal temperature enhanced the formation of bainitic ferrite with a refined microstructure, which has a beneficial influence on strength, but reduces impact toughness. The lower impact toughness at lower isothermal temperature is attributed to the sluggish redistribution of carbon from the bainitic ferrite into the surrounding austenite. Higher solute carbon in the bainitic ferrite contributes to an increase of strength, but at the same time, encourages a propensity to cleavage fracture.

ROS에서 Gazebo를 이용한 라인 트레이서 시뮬레이션 환경 구축

황보승 한국산업융합학회 2023 한국산업융합학회 논문집 Vol.26 No.2

In this paper, we directly implemented the Line Tracer ROS package that can detect and follow lines drawn on the map on Gazebo, an open-source that is widely used in autonomous driving research. For line detection, the cv_bridge package was used to enable OpenCV's image processing tools, and parameters such as robot speed, line color and ground material could be changed. In addition, proportional (P) and PID controls could be implemented using the color centroid obtained through image processing. Through this approach, the effect of proportional and differential coefficients on the robot's line tracer motion could be analyzed effectively. In addition, by displaying robot simulation results using various tools of ROS, an efficient development for control nodes could be established in ROS.

CCD 카메라를 이용한 디지털 X-ray개발과 영상처리에 관한 연구

황보승,정재상 湖南大學校 情報通信硏究所 2003 정보통신연구 Vol.13 No.-

Existing X-ray System sees the fluorescent petal which converts radiation source to the visible ray. And it amplifies the light which radiates. It is composed of the image increased dividend tube and the film which operate. The bulk and one funeral film of the system which it follows hereupon come out until, process is very complicates. This system it transfers with digital X-ray system of that expense to be, fluorescence it sells and it uses the digital CCD camera and it is a low price and the system form simplification to sleep develops the X-ray system which it makes and it does. The X-ray the image follows in resolving power of camera and density of the fluorescent petal becomes decision. But, 8bit with 1300X1030 it uses the Monochrome Digitalcamera which has the resolution from this time research, It used the indirect photographing fluorescent petal which is used in existing system. It excludes the image multiplier tube of existing system and importance it lets in process and the system does simplification, It comes true that expense and it does to sleep.

Growth, structure and optical properties of amorphous or nano-crystalline ZnO thin films prepared by prefiring-final annealing

황보승,황규석,Yun-Ji Lee 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.5

The structural, surface morphological, and optical characteristics of amorphous or nanocrystalline ZnO thin films deposited on soda-lime-silica glass substrates by a prefiring-final annealing process at various temperatures were investigated using Xray diffraction analysis, a field emission-scanning electron microscope, a scanning probe microscope, a ultraviolet-visible-near infrared spectrophotometer, and photoluminescence (PL). The films exhibited an amorphous pattern even when finally annealed at 100 oC-200 oC for 60 minutes, while highly c-axis oriented ZnO films were obtained by prefiring at high temperature, 400 oC and 500 oC. A relatively high transmittance in the visible spectra range and clear absorption edges of the films were observed except for the film annealed at 100 oC. The PL spectra of amorphous ZnO thin films annealed at 100 oC -200 oC with strong near-band-edge (NBE) emission were observed while the defect-related broad green emission was nearly fully quenched. After high-temperature prefiring and final annealing at above 300 oC, the PL spectra of the films were greatly deteriorated, the UV peak was diminished.