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김성휘,서정윤 7개 국립대학교 환경연구논문집 공동발행 위원회 2005 공업기술연구 Vol.5 No.-
It is said that though cleaning has implications for our lives, it ha been being only conducted by people's experiences and their insight to cleaning without certain methods. The teachings for effective cleaning include how students well conduct cleaning as well as how the teachers effectively teach the method for dffective cleaning. The concept of cleaning is related to the action which removes the foreign materials from our living environment, and they can be classified into three categories: waste, dust, and stain. Thus, conducting cleaning may mean the work for removing these from something. The results of this research suggested that preparation for cleaning is important, the tools should be sufficiently provided, and particularly the teacher should praise the students who did good job at cleaning. They also indicated that the conditions for cleaning allow for cleanig teaching as well as help to have better environment by the efficiency of the cleaning. And further studies should had focus on the method for cleaning and preparation for preferable cleaning conditions.
張珍成,崔允慈,姜佑昌,李佶勳,金輝 서울大學校 農業生命科學大學 附屬樹木園 1998 서울大學校 樹木園 硏究報告 Vol.- No.18
히어리가 생육하는 전국 5개지역에서 총 31개의 방형구조사를 통해 목본식물의 종조성과 흉고직경을 측정하였다. 흉고직경급으로 본 히어리의 개체군 구조는 집단별로 서로 상이한 모습을 보였다. 산청지역은 낮은 경급의 수목보다는 5-6 cm급의 개체가 많았고 포천지역의 경우는 많은 수의 실생묘가 관찰되었고 1-2 cm와 3-4 cm급의 개체가 많았다. 또한 백운산, 뱀사골 그리고 남해지역은 비교적 밀도가 낮은 집단으로 고른 직경급의 분포를 보였다. 현재의 개체군 구조로부터 포천지역은 개체군의 성장에 예측되는 반면 산청지역은 감소가 예측되었다. 히어리가 생육하는 식물군집은 생육지의 위치상으로도 상당히 이질적인 장소들로 구성되어 있다. 백운산지역은 비교적 상당히 큰 분포지였으며 남사면의 산복에 위치하는 건조한 지역으로 신갈나무가 우점을 하는 지역으로 비교적 안정된 천이단계에 도달한 것으로 생각된다. 그러나 나머지 대부분의 지역에 있어서 생육하는 지형은 북사면의 계곡부로 습기가 많고 빛이 매우 부족한 지역이었다. 따라서 히어리의 생육지 요구도의 폭이 넓은 것으로 보여준다. 남해지역과 뱀사골 지역은 조림지에서 생육하는 것이 관찰되어 히어리가 맹아에 의해서 개체군을 유지할 수 있다는 것을 확인하였다. 히어리는 넓게 분포하고 생육지요구폭이 넓고 극히 제한된 수의 개체군을 갖는 유형의 희귀식물로 현재의 생육지와 개체군에 대한 절대적인 보호가 필요하다. From 31 plots of five populations, species composition and DBH class of Corylopsis glabrescens var. totoana (Makino) Yamanaka were investigated. Each population of C. glabrescens var, totoana showed different patterns of class distribution. Since there are many old trees with 5-6 cm diameter and less seedlings, Shan-chung population probably decline population in size in the near future. On the contrary, due to many seedlings in Po-chun population, population may expand in size. Baek-un population showed the unique habitat with large population relatively. Especially in the sunny southern slope and ridge of mountain, Quercus mongolica dominated and maintained a high portion of vegetation there. As the man-made forest, Nam-hae and Baem-sa-gol populations may maintain only by the root sprouts. Generally despite small populations, C. glabrescens var. totoana occurred over a wide geographic range in diverse habitats. This species may not be endangered unless the natural habitat is destructed by human. It is strongly recommended to protect of all sites and populations as the long term strategies for preservation of this species.
박상희,윤태성,김완종 연세대학교 산업기술 연구소 1986 논문집 Vol.18 No.2
This paper describes the application of dynamic programming(DP) method to solve the problem for optimal load dispatching of thermal power systems. A model system that is similar to the system of Korea electric power corporation is composed of 26 thermal generating units. In operating a model system, total generating fuel costs of two cases were analysied; one was the case of operating all units depending on the formula of equal incremental fuel costs, another was the case of the application of dynamic programming methods with proper starting-up and shutting down units. The computation results showed that the application of dynamic programming methods could reduce remarkably fuel costs(up to 3%) by using of practical data.
IBM-PC/AT를 중앙처리장치로 이용한 영상처리시스템의 설계
유경걸,박상희,최윤호 연세대학교 산업기술연구소 1991 논문집 Vol.23 No.2
In this paper, the 512×512×8 bit image processing system, which can acquire, process and display one frame image using IMB-PC/AT as a central processing controller, and implement high speed H/W logic, was designed, and its operation S/W of the total system was developed in the form of a menu for users' convenience.
Yoon-hyun Lee,Myung-sung Kim,Young-hui Nam,Ae-ri Son,Sung-won Kang,Chang-young Park,Suk-min Ji,Sung-mi Moon,Won-suk Kang 한국국제협력단 2020 연구보고서 Vol.- No.-
This study is intended to be used as basic data when determining the current status of infectious diseases in KOICA cooperation countries and when KOICA selects the field, country, method, and timing of support for partner countries as a donor. The main method of understanding the status of infectious diseases of cooperation countries was to quantify and analyze JEE and SPAR evaluation results known to present an unbiased standard of IHR by 1-5 points. As a result of the annual self-investigation of SPAR by focal point(health officials) from cooperation countries, out of the 10 capacities in 2019 compared to 2018, the remaining 9 capacities excluding the “point of entry” sector increased slightly, and the Zoonotic disease capacity rose 2.7%, showing the largest difference increase. The weakest capacities of the JEE standard were Antimicrobial resistance, Point of entry, Linking public health with security authorities, Emergency preparedness. The countries included Afghanistan, Nigeria, DR Congo, East Timor, and Cameroon. The weakest indicators based on SPAR in 2019 were Workforce development, Risk communication, Medical countermeasures and personnel deployment, Emergency preparedness, Food safety, Zoonotic disease, and countries include East Timor, Laos, Nepal, DR Congo, and Cote d’Ivoire. As a result of analysis by KOICA department(by continent), the indicators of weakness are as follows. ① Southeast Asia Department I- Myanmar(Emergency preparedness), Cambodia (Emergency response operations) ② Southeast Asia Department II- East Timor(Zoonotic disease, Emergency preparedness, Linking public health with security authorities) ③ Southwest and Pacific Asia Department- Afghanistan(National legislation, Antimicrobial resistance, Food safety, Biosafety and biosecurity, Point of entry), Pakistan(Antimicrobial resistance, Emergency preparedness), Nepal (National legislation, Zoonotic disease, Food safety), Sri Lanka(Emergencypreparedness) ④ Middle East and Central Asia Department- Iraq(National legislation), Azerbaijan(National legislation, Food safety) ⑤ East Africa Department- Kenya(Medical countermeasures and personnel deployment), Rwanda(Antimicrobial resistance), Mozam bique(Emergency preparedness) ⑥ West Africa Department- DR Congo(Antimicrobial resistance, Food safety, Emergency preparedness, Linking public health with security authorities, Medical countermeasures and personnel deployment, Point of entry), Cote d’Ivoire(Antimicrobial resistance), Senegal(Point of entry), Ghana(Antimicrobial resistance, Medical countermeasures and personnel deployment), Nigeria(National legislation, Emergency preparedness, Linking public health with security authorities, Medical countermeasures and personnel deployment, Point of entry), Cameroon(National legislation, Point of entry). From the results of this study, it was possible to know the current status of vulnerable health care in KOICA partner countries, and it was an opportunity to use basic data to search for the timing, fields, and methods of support for Korea as a donor country. Even in the recent Corona-19 situation, Korea has been receiving attention from all over the world as it has been well controlled by utilizing a high health care system. Now that it can be said that sufficient qualifications as a donor country have been verified, it is necessary to find a role and method for supporting the donor country and exporting K-quarantine.
Gwon, Hui-Dong,Bang, Jun-Suk,Yoon, Kye-Seok,Park, Se-Hong,Park, Sang-Hui,Jung, Min-Yong,Lee, Sang-Han,Kim, Min-Woo,Hong, Sung-Wan,Cho, Gyu-Hyeong Institute of Electrical and Electronics Engineers 2018 IEEE transactions on power electronics Vol.33 No.4
<P>This letter presents a 2-phase 3-level (2P3L) envelope tracking supply modulator (ETSM) for a long-term evolution 20 MHz (LTE20) radio frequency power amplifier as a solution for the ET system. This 2P3L ETSM that is composed of only switching converters achieves high efficiency, fast transient response, and a small output current ripple. To properly operate the proposed 2P3L ETSM, 4 pulse width modulatiop (PWM) signals with a 90° phase shift from each PWM signal are required without any mismatch between duty cycles. To remove the mismatch, a time-division multiplexing comparator and a duty-cycle calibrator are proposed. Thanks to the proposed techniques, the proposed ETSM fabricated in 0.18-μm CMOS achieved the highest peak dynamic efficiency of 88.6% with an LTE20 signal, which is superior to the state-of-the-art systems.</P>