• International Journal of Contents
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• 제14권2호
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• pp.24-29
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• 2018

In this paper, we propose an efficient traffic light detection (TLD) method as an advanced driver assistance system (ADAS) for elderly drivers. Since an increase in traffic accidents is associated with the aging population and an increase in elderly drivers causes a serious social problem, the provision of ADAS for older drivers via TLD is becoming a necessary(Ed: verify word choice: necessary?) public service. Therefore, we propose an economical TLD method that can be implemented with a simple black box (built in camera) and a smartphone in the near future. The system utilizes a color pre-processing method to differentiate between the stop and go signals. A mathematical morphology algorithm is used to further enhance the traffic light detection and a circular Hough transform is utilized to detect the traffic light correctly. From the simulation results of the computer vision and image processing based on a proposed algorithm on Matlab, we found that the proposed TLD method can detect the stop and go signals from the traffic lights not only in daytime, but also at night. In the future, it will be possible to reduce the traffic accident rate by recognizing the traffic signal and informing the elderly of how to drive by voice.

• 융복합기술연구소 논문집
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• 제1권1호
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• pp.29-33
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• 2011

This study is performed to investigate the effect of the artificial light for room lightening. To do that, the experiments were done using the black room with 1m3 and performed to show the effect of the length between the room and light source and light intensities as LUX. The LUX of 18 sites in the room was measured using LUX meter. The length between the room and the light source was chosen as 500mm, 1000mm, and 1500mm and the light intensities was 3 levels. The results were shown the distinct difference between the part directly projected through the light path and non-directly projected. So, the light delivery path have to be modified for next step research. The results were very sensitive for the part directly projected through the light path. This study showed the basic results for room lightening using light source to simulate the solar lightening and was worth in a strict sense as fundamental study.

• 패션비즈니스
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• 제21권1호
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• pp.166-176
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• 2017

This study is fundamental research on how to be able to scientifically quantify and reproduce a natural dyeing procedure. By dyeing silk fabrics, the establishment of a reproducible dyeing method was sought. Juglans mandshurica has been known as one of the most widely used black vegetable dyes. Repetition conditions and combination dyeing were performed with Juglans mandshurica cortex, gallnut, clove, and Eclipta prostrata L. extracts to express a deep black color. Juglans mandshurica cortex, gallnut, clove, and Eclipta prostrata L. extracts were suitable for black coloration and showed a darker black color when combined with iron mordant. Specifically, Juglans mandshurica cortex and clove can be used for deep black coloring. Color fastness when washed or dry cleaned was found to be strong with a grade of 4-5 and fastness to light was rated at a 3-4. The grade of color change when exposed to rubbing and perspiration was good at a 4-5. In regards to functional property aspects, it showed excellent results with a 99% deodorization rate at 120 minutes of dyeing time, 97.1% UV protection rate, and 85.9% and 62.3% bacterial reduction against Staphylococcus aureus and Streptococcus pneumoniae, respectively. Therefore, it is considered that the extract from the Juglans mandshurica cortex is of great value as an eco-friendly, natural dyestuff.

• 복식
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• 제41권
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• pp.207-223
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• 1998

The purpose of this study is to abstract the image from black dress, which has been favored by many people regardless of the times and examine it throughout the history of drss and thereby clearly define the images that black limplies in dress. Color image is a visual symbol, an image that forms through a combination of visual stimulus created by color, coupled with all the external factors related to it. Black is a one-dimensional color, of which the impact is subjective to its energy, which depends on light reflected on the object, and its texture. Therefore, black projects different images, depending on its surroundings. In general, black has had negative connotations in the Western culture. In dress, however, it has implied other various images different from the general negative ones. By combining general images of black and those exprssed in dress, major images of black were categorized into dignity, elegance, eroticism, asceticism and tragedy. Dignity is a category similar to the sublime. Dress with dignity has sharp contours and is generally made of velvet or silk which can be characterized by their splendor and voluminous-ness, exaggerating the body of a person wearing it. Such costume is mostly found in powerful countries in history such as Burgundy Court in the 15C, Spain in the 16C. Netherlands in the 17C. Elegance evokes grace and beautifulness. It includes elegance, grace, beauty and dandyism as subcategories or silk. Good examples are dandies' black costume and Ladies black and white dressees in the 19C. Eroticism is an image which expresses sexual attractiveness. Costume with eroticism is made of velvet or silk, which project sumptuousness through reflection. Such costumes expose parts of the body or are tightly tailored in order to emphasizes body contours. Asceticism means restraint from physical and mental desires. Costume with asceticism makes a person wearing it look smaller by covering the whole body. Puritan's black dresses and Bourgeoisie's black suit are good examples. Tragedy is anguish. sorrow. Black costume with grievous feelings such as mourning dresses is made of lusterless textile concealing most of the body except for the face.

• 대한교통학회지
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• 제23권1호
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• pp.9-20
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• 2005

교통사고를 조사하여 어떤 지역에 어떠한 문제가 있는지를 진단하고, 사고발생에 영향을 미치는 요인을 추출하는 것은 매우 중요하다. 본 연구는 사고지점의 파악 및 영향인자파악을 목적으로 수원시 2001년 사고다발지점을 대상으로 각 사고유형 및 위치별 $P_i$(각 사고가 발생할 때 특정의 사고와 관련된 특징이 나타날 확률)을 이항분포로 모형화하여 지점 (도로구간 및 교차로)별로 특성적 사고가 발생한 것으로 판단되는 지점과 그렇지 않은 지점으로 진단하였고, 또한 지점별 안전성능함수(Safety Performance Function)를 구한 후 허용 임계치인 5%를 적용하여 임계치안에 드는 지점들을 진단하고 파악하였다. 이후 진단된 지점과 그렇지 않은 지점을 종속변수로 하고 주요 도로 환경적조건 및 교통조건을 독립변수로 하여 로지스틱 판별분석을 실시하여 분석 결과로 유의하다고 판단된 사고요인들을 도출하였으며 이를 기반으로 각 지점별 개선방안에 대한 대책수립가능성을 또한 검토하였다. 본 연구에서 제시된 진단방법과 로지스틱판별분석을 통한 요인추출 방법은 향후 유사연구에 활용 가능할 것으로 사료된다.

• International Journal of Industrial Entomology and Biomaterials
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• 제35권2호
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• pp.100-105
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• 2017

Under natural conditions, black soldier fly, Hermetia illucens (L.) (Diptera: Stratiomyidae), colonizes in warm temperate regions, and is active in Korea from May through October. Information on black soldier fly rearing, which is affected by seasonal factors in Korea, is limited. Oviposition by black soldier flies is dependent on light intensity and wavelength. Therefore, continuous mass rearing of this fly requires determination of optimal artificial conditions of illumination. In this study, we compared the number of eggs laid under an artificial light source (750 watt HPL lamp) versus nature sunlight. Our results showed that compared to oviposition under natural sunlight, the use of one or two lamps for 7 hours, resulted in only 43 and 76%, of the total number of eggs laid under natural sunlight, respectively. We also investigated the hatchability of oviposited eggs under artificial illumination and under natural sunlight. The hatching rate under the former was much significantly lower than under the latter. Further detailed research is required to develop methods for successful mass rearing of black soldier fly throughout the year by means of an indoor system.

• 한국산학기술학회논문지
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• 제17권2호
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• pp.246-251
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• 2016

도로조명 중 누출광을 고려하지 않은 보안등이 아직도 많이 사용되어 주거지 침입광이 발생되고 있다. 이러한 도로조명의 침입광 저감을 위해 차광판이 설치되고 있지만, 효과가 미미하거나 미적 요소 및 안전성에 문제가 있다. 본 연구에서는 침입광 효율적인 저감을 위해 차광판 구조별 저감 특성을 연구하였으며, 그 방법으로 조명시뮬레이션 프로그램인 Relux 활용하였다. 또한 시뮬레이션의 값의 정확성을 알기 위해 실제 측정값과 검증하였다. 그 결과 (상)도색 글로브를 제외한 모든 차광판에서 후사광 저감 효과가 뛰어났으며, 도장형 차광판의 경우 전사광도 줄어들어 글레어 저감도 효율 적인 것으로 확인되었다. (상)도색 글로브는 위쪽으로 가는 빛을 아래로 반사시켜 후사광 전사광 모두 증가하였지만, 스카이 글로우(Sky glow) 저감에 효율적인 차광판으로 확인되었다. 시뮬레이션 값과 실측값은 90 %의 일치률을 보였다.

• 분석과학
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• 제17권4호
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• pp.315-321
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• 2004

The aim of this study was to investigate the evidential value of blue and black ballpoint pens on paper by nondestructive techniques. In this work, 21 blue and 22 black ballpoint pens which were purchased on different brands were analyzed by Raman Spectroscopy and Video Spectral Comparator (VSC). Surface-Enhanced Resonance Raman Spectroscopy (SERRS) with excitation at 685 nm and VSC with several spot light filters were used for the discrimination of ballpoint pen inks. In the SERR spectra, the ballpoint pen inks on paper could be shown sharp spectral bands and distinguished by their band shapes and relative intensities. In the blue and black ballpoint pen inks, the discriminating powers (DP) by SERRS were 0.85 and 0.67 and the DP by VSC were 0.88 and 0.90, respectively. The DP by combined sequence of techniques was all 0.97 in both black and blue ballpoint pen inks.

• 천문학회보
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• 제39권2호
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• pp.86.2-86.2
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• 2014

We present a new ray-tracing code, "Odyssey", for the Kerr spacetime accelerated by the Graphics Processing Unit (GPU). Taking advantage of the ability of nVidia graphic cards to evaluate trajectories of a large amount of photon simultaneously, the code is two orders of magnitude as fast as the previous CPU-based code corresponding to the speed of few nanoseconds per photon per time step. In the light of the Graphic User Interface (GUI) powered by the GPU-enhanced 2D/3D displaying technique, DirectX, it is feasible for users to manipulate diverse results such as rotating and zooming in/out the trajectories of photon instantly near the black hole. Thus the Odyssey can serve as a tool not only for scientific but also for the educational purpose. We discuss possible applications in detail in light of several results such as the shape of the silhouette of a black hole, the shape of a hot spot orbiting a black hole, and 3D photon trajectories.

• 천문학회보
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• 제42권2호
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• pp.73.1-73.1
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• 2017

Reverberation mapping is one of the best way to investigate structure and kinematics of broad-line regions around central supermassive black holes of active galactic nuclei (AGN). It is usually used to estimate masses of supermassive black holes. So far, reverberation mapping studies have achieved good results for dozens of AGN by spectroscopic monitoring. However, spectroscopic monitoring is time consuming and high cost. Here, we present result of photometric reverberation mapping with medium-band observation. We monitored five nearby AGN which are already studied, have short time-lag, and show bright H-alpha emission lines. Observation has been performed for ~3 months with ~3 days cadence using three medium-band filters installed in LSGT (Lee Sang Gak Telescope). We found 0.01-0.06 magnitude variations by differential photometry. Also time-lags between continuum light-curves and H-alpha emission line light-curves are calculated using Javelin software. The result shows that our study and previous studies are consistent within uncertainty range. From verification of availability in this study, photometric reverberation mapping could be used as a powerful tool to measure central supermassive black holes for large samples and high-redshift AGN in the future.