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홍순필(Soon-pil Hong),김문주(Mun-joo Kim),김은성(Eun-sung Kim),김두용(Dooyong Kim),홍진우(Jin-woo Hong),김기완(Kiwan Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
The light gets darker from center to edge of the light source. Therefore, we can find the center of the sun using shading histogram. Moreover, we can track the exact position of the sun with the shading histogram. In this paper, we propose a new technique using image-processing of digital camera, in order to locate the position of the sun.
화강암질풍화토(花崗岩質風化土)의 Consistency 측정(測定)에 관한 연구(硏究)
강예묵,조성섭,홍순필,Kang, Yea Mook,Cho, Seung Seup,Hong, Soon Pil 충남대학교 농업과학연구소 1980 Korean Journal of Agricultural Science Vol.7 No.2
Slump시험(試驗)보다는 조작(操作)이 간편(簡便)한 유통(流動) Table을 사용(使用)하여 화강암질풍화토(花崗岩質風化土)의 유동한계(流動限界)를 측정(測定)하는 방법(方法)을 시험(試驗)하여 다음과 같은 결론(結論)을 얻었다. 1) 화강암질풍화토(花崗岩質風化土)의 유동한계(流動限界)는 입도분포(粒度分布), 퐁화도(風化度) 및 유색광물함량(有色鑛物含量)에 영향(影響)되므로 유동(流動) Table에 의한 유동한계시험법(流動限界試驗法)을 제정(制定)할 때는 최대입경(最大粒徑)이 규정(規定)되어야 할 것으로 생각된다. 2) 유동(流動) Table의 낙하회수(落下回數)를 10회(回)로 하여 유동고(流動高)와 유동폭(流動幅)이 1cm일 때의 함수비(含水比)의 평균치(平均値)를 유동한계(流動限界)로 택(擇)하면 Slump시험(試驗)에서 구(求)한 유동한계(流動限界)보다 약간 작은 값으로 되며 대략(大略) 10%오차한계선내(誤差限界線內)에 속(屬)했다. 3) 유동폭(流動幅)과 함수비(含水比) 및 유동고(流動高)와 함수비(含水比)의 관계곡선(關係曲線)은 유사(類似)한 변화(變化)를 나타내고 반대수용선(半對數用線)에 도시(圖示)하면 액성한계시험(液性限界試驗)에서와 같이 직선관계(直線關係)를 나타냈다. 4) Slump시험(試驗)에 비(比)하여 조작(操作)이 간편(簡便)하고 개인적(個人的)인 오차(誤差)가 작으며 유동폭(流動福)과 유동고(流動高)를 동시측정(同時測定)하여 시험오차(試驗誤差)가 작은 것으로 공학적(工學的) 성질(性質)을 판단(判斷)하는 자료(資料)로 사용(使用)될 수 있는 것으로 생각된다. This test was carried out to present criterion to measure the liquid limit of weathered granite soil by using the flow-table method whose operation is easier and more convenient than slump test. The results are as follows. 1. Since liquid limit of weathered granite soil depends upon the particle size distribution, weatheredness and content of colored minerals, maximum particle size should be prescribed when the testing rule of liquid limit by flow-table method is enacted. 2. If take the averaged water content as liquid limit where the height and width of flow are 1 cm respectively by 10 times dropping, this liquid limit is slightly less than the one by slump test. The differance of liquid limit between flow table method and slump test is about 10%. 3. Correlation curves of flow width-water content and flow hight-water content show similar shapes. Those are straight lines in semi-logarithm paper just as liquid limit test. 4. This flow-table method is more convenient and has less personal error of measurement than slump test does. So flow-table method would be favourably utilized for judging the engineering properties of soil.
홍순필,김은성 순천향대학교 부설 산업기술연구소 2004 순천향 산업기술연구소논문집 Vol.10 No.2
In SCADA system, n RTU is a device installed at a remote location, that collects data, codes the data into a format that is transmittable and transmits the data back to a central station, or MTU. An RTU also collects information from the master device and implements processes that are directed by the master device. RTUs are equipped with input channels for sensing or metering, output channels for control, indication or alarms and a network port, In general, the data are transmitted via a wired network infrastructure such as RS422 or RS485 between RTU and MTU. But, the system suffers from covering remote areas due a limited range of the wired network, and building a wired communication network is not easy in the circumstances. In this paper, we design and implement a smart cost-effective Web-RTU that can communicate with MTU via Web. Web is of benefit to the Web-RTU,because it is not only free from the distance limitations but also is built easily and cost-effectively wherever Internet resources are available. Additionally, Web can be easily applied to the SCADA system with the development of hardware and software for communications. The Web-RTU has a program memory, a data memory and a RAM inside, and uses Atmega128, low-cost 8 bit micro-processor with eight AI(Analog Input). It performs well enough to implement all existing roles of RTU.
IEEE 802.11 기반의 애드 혹 네트워크의 효율적인 공간적 재사용에 관한 연구
김태경,홍순필,김은성 순천향대학교 부설 산업기술연구소 2007 순천향 산업기술연구소논문집 Vol.13 No.1
IEEE 802.11 MAC mainly applies two techniques to avoid possible collisions : physical carrier sensing and RTS/CTS handshake with the virtual carrier sensing. However, these schemes incur the spatial waste, because they do not avoid all packet collisions in practice, and put the excessive off-limit area of transmission as the surrounding area including potential interference with the ongoing transmission, In this paper, IFMdnterference-Free MAC) is proposed to minimize the interference and allow the efficient spatial reuse, In the IFM, the distance between a sender and a receiver is reported to any node overhearing the ongoing transmission, and neighboring node makes its deferment decision adaptively based on the communication distance. We show that IFM provides significant improvement in throughput and packet drop ratio through simulations using NS-2.