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전산유체역학을 통한 간척지 내 벤로형 온실의 자연환기량 분석
이상연,이인복,권경석,하태환,여욱현,박세준,김락우,조예슬,이승노,Lee, Sang-Yeon,Lee, In-Bok,Kwon, Kyeong-Seok,Ha, Tae-Hwan,Yeo, Uk-Hyeon,Park, Se-Jun,Kim, Rack-Woo,Jo, Ye-Seul,Lee, Seung-No 한국농공학회 2015 한국농공학회논문집 Vol.57 No.6
Recently, the Korean government announced a new development plan for a large-scale greenhouse complex in reclaimed lands. Wind environments of reclaimed land are entirely different from those of inland. Many standard books for ventilation design didn't include qualitative standard for natural ventilation. In this study, natural ventilation rates were analyzed to suggest standard for ventilation design of venlo type greenhouse built on reclaimed land. CFD (Computational Fluid Dynamics) simulation models were designed according to the number of spans, wind conditions and vent openings. The wind profile at a reclaimed land was designed using ESDU (Engineering Sciences Data Unit) code. Using the designed CFD simulation model, ventilation rates were computed using mass flow rate and tracer gas decay method. Additionally computed natural ventilation rates were evaluated by comparing with ventilation requirements. As a result of this study, ventilation rates were decreased with increasing of the number of spans. Ventilation rates were linearly increased with increasing of wind speed. When the wind speed was $1.0\;m{\cdot}s^{-1}$, only side vent was open and wind direction was $45^{\circ}$, homogeneity of ventilation rate at 0~1 m height is the worst. Finally, chart for computing natural ventilation rate was suggested. The chart was expected to be used for establishing standard of ventilation design.
내부 광전자방출 분광법을 이용한 Pt/HfO<sub>2</sub>/p-Si Metal-Insulator-Semiconductor 커패시터의 쇼트키 배리어 분석
이상연,서형탁,Lee, Sang Yeon,Seo, Hyungtak 한국재료학회 2017 한국재료학회지 Vol.27 No.1
In this study, we used I-V spectroscopy, photoconductivity (PC) yield and internal photoemission (IPE) yield using IPE spectroscopy to characterize the Schottky barrier heights (SBH) at insulator-semiconductor interfaces of Pt/$HfO_2$/p-type Si metal-insulator-semiconductor (MIS) capacitors. The leakage current characteristics of the MIS capacitor were analyzed according to the J-V and C-V curves. The leakage current behavior of the capacitors, which depends on the applied electric field, can be described using the Poole-Frenkel (P-F) emission, trap assisted tunneling (TAT), and direct tunneling (DT) models. The leakage current transport mechanism is controlled by the trap level energy depth of $HfO_2$. In order to further study the SBH and the electronic tunneling mechanism, the internal photoemission (IPE) yield was measured and analyzed. We obtained the SBH values of the Pt/$HfO_2$/p-type Si for use in Fowler plots in the square and cubic root IPE yield spectra curves. At the Pt/$HfO_2$/p-type Si interface, the SBH difference, which depends on the electrical potential, is related to (1) the work function (WF) difference and between the Pt and p-type Si and (2) the sub-gap defect state features (density and energy) in the given dielectric.
이상연,Lee, Sang Yeon Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.6
The molecular geometries and harmonic vibrational frequencies of dibenzofuran in the ground and lowest triplet state have been calculated using the Hartree-Fock and Becke-3-Lee-Yang-Parr(B3LYP)density functional methods with the 6-31G basis set. Upon the excitation to the lowest triplet state, the molecular structure retains the planar form but distorts from a benzene-like to a quinone-like form in skeleton. Scaled vibrational frequencies for the ground and lowest triplet state obtained from the B3LYP calculation show excellent agreement with the available experimental data. A few vibrational fundamentals for both states are newly assigned based on the B3LYP results.
이상연,조승진,최승렬,김순희,엄진영,장현오,유형관,Lee, Sang-Yeon,Jo, Seung-Jin,Choe, Seung-Ryeol,Kim, Sun-Hui,Eom, Jin-Yeong,Jang, Hyeon-O,Yu, Hyeong-Gwan 한국건강관리협회 2006 한국건강관리협회지 Vol.4 No.1
Background: This survey has focused on Client-Satissfaction for health examination services of Korean Association of Health Promotion, This research will help final weak point and promote the qualify of the services provided. Methods: This survey was done on 400 visitors of the clinic. Between Jan. 2 and May 3l, 2005 Questionaires were distributed to the visitors with a informed consent. Results: The visitㅐrs for health examination at Daegu chapter of Korean Association of Health promotion had high-school or higher level education(79.8%) and were self-employed persons with an average monthly income of 3~4 million won(27.7%), and housewives(33.0%). The most frequent complaints of the visitors was the difficulty in access to the center. The motives for taking health examination were cheap cost of examination(32.7%) and recommendation by fami1y members and friends(42.0%). The possitive attitude of the employees of KAHP were kind reponses to phone calls(85.3%) and kind explanations to questions(68.5%). Regarding the merits of the examination at KAHP, appropriate equipments(68.0%) and quality of equipments(66.0%) and they expressed their desire for further use revisit to the KAHP(85.3%).Conclusions. It is concluded that this KAHP is providing services meeting their demands in cost and qualitatively of health examination. However, it is noted that there are several weak points in own system that make own clients uneasy in taking health examination. They have to be solved by providing transporting for accession, kind attitudes and comfortable facilities.
이상연,Lee, Sang-Yeon 한국데이터베이스진흥원 2005 디지털콘텐츠 Vol.2 No.-
최근 수년 전부터 국내 언론매체들에서는 우리나라가‘IT 강국’, ‘인터넷 선진국’이란 말이 가끔씩 나오곤 한다.그것은 무엇보다도 전국적으로 세계 최고의 고속 케이블망을 설치했고, 디지털 기술이 발전돼 있다는 데에 기인하고,그 케이블망으로써 전국 어디서나 인터넷을 접하고 빠른 속도로 이용할 수 있다는 것을 말하는 것 같다. 그러면 그렇게 발달된 기술로써 항시 접할 수 있는 인터넷을 통해 우리나라 사람들을 무엇을 하고 있을까? 각자의 취향과 관심사에 따라 인터넷을 이용하는 분야가 다르겠지만, ‘문화의 시대’라는 21세기에 특히 대중문화 산업이 각광받고 있는 요즈음 문화예술에 관한 지식정보 콘텐츠들을 찾아보자.