해남 모이산 인근 토양 및 농작물의 셀레늄(Se) 분포 특성

김선옥,천세원,박규령,왕수균,Kim, Seon-Ok,Cheon, Se Weon,Park, Gyu-Ryeong,Wang, Sookyun 대한자원환경지질학회 2015 자원환경지질 Vol.48 No.3

해남 모이산 천열수 광산 주변의 열수변질작용에 의한 암석, 토양과 농작물간의 셀레늄의 상호작용을 규명하기 위하여, 모이산 인근의 토양과 농작물 시료를 채취 분석하였다. 토양시료는 6개의 산 토양과 6개의 밭 토양을 대상으로 수분함량, pH, ICP, XRD, XRF 분석을 통해 구성 광물과 원소함량을 분석하였으며, 농작물 시료는 토양과의 관계를 파악하기 위해 이 지역에서 재배된 양파와 대파를 대상으로 원소함량을 분석하였다. 토양에 대한 XRD 분석 결과, 주요 구성광물은 석영과 장석이며, 그 외 열수변질작용에 의해 일라이트, 녹니석과 적철석을 포함하고 있는 것으로 나타났다. 산 토양과 밭 토양의 pH는 각각 4.6~4.9와 5.2~6.7로 나타났는데, 산 토양에 비하여 밭 토양의 pH가 높게 나타난 것은 영농에 의한 비료시비가 원인으로 판단되었다. 원소함량 분석 결과, 비료의 영향이 크게 작용하는 밭 토양에서 산 토양에서는 검출되지 않았던 K(24.81~79.49 ppm), Ca(29.27~116.33 ppm) 등이 다량 함유한 것으로 나타났다. 이러한 경향은 작물에서도 나타나는데, 상대적으로 높은 농도의 K(116.89~169.79 ppm), Ca(20.18~32.29 ppm)가 농작물에 흡수되어 있는 것으로 분석되었다. 토양 시료에서의 Se 함량은 18.35~70.31 ppb의 범위로 분석되어 분석 시료간 유의미한 차이를 나타내지는 않았으나, 양파(119.48~179.50 ppb)와 대파(146.65 ppb)에서는 많은 양의 Se이 검출되었다. 이는 작물에 따라 각 원소에 대한 흡수율이 상이하여 농축도 역시 다르게 나타나는 것으로 판단되었다. Samples from soils and crops were collected and analyzed in order to investigate the interactions of selenium among rocks, soils, and crops by hydrothermal alteration near epithermal mines in the region of Mio-san, Haenam. Soil samples included 6 samples each from mountain and farm area and compositional minerals and their contents were analyzed by water content, pH, ICP, XRD, XRF. Crop samples from onion and scallion were analyzed for chemical composition to elucidate the relationship with soils. Results from XRD analysis for soil samples showed that major compositional minerals are qualtz and feldspar, and illite, chlorite, hematite formed by hydrothermal alteration were included on a small scale. The pH ranges of soil samples from mountain and farm were measured at 4.6~4.9 and 5.2~6.7, respectively. The higher pH in farm soils may result from fertilization during agricultural activities. Results from ICP analysis showed that, compared to soil samples from mountain area with no potassium and calcium, significant amount of K and Ca were detected in soil samples from farms which is affected by fertilization. In a similar manner, potassium and calcium were absorbed and detected in crop samples at relatively high concentrations (116.89~169.79 ppm for K and 20.18~32.29 ppm for Ca). While the selenium contents in soil samples ranged from 18.35 ppb to 70.31 ppb which showed no significant difference, high concentrations of selenium were detected in onion (119.48~179.50 ppb) and scallion (146.65 ppb). These difference in enrichment for each element may result from the distinctive adsorption characteristics depending on crops.

광섬유 ROTDR 센서를 이용한 침입 탐지기법의 개발

백세종,권일범,정철,유재왕 한국센서학회 2002 센서학회지 Vol.11 No.4

광섬유 ROTDR (Rayleigh Optical Time Domain Reflectometry )을 이용하여 침입자를 높은 감도와 넓은 영역에서 탐지할 수 있는 매설형 광섬유 센서의 개발에 관한 실험을 수행하였다. 단위 길이당 넓은 면적을 감지 할 수 있는 매설형 광섬유 감지부를 설계 제작하고, 인가된 침입물체의 하중에 따른 신호특성을 고찰하였다. 일반 광통신용인 직경 1.5mm와 3.5mm인 광섬유를 길이 각각 4km를 사용하여 광섬유 굽힘손실을 발생시키는 침입감지 장치를 설계 제작하고, 상용 ROTDR의 조건설정은 파장 1.55㎛, 거리범위 5km, 펄스폭 20 ns, S/N비가 5.7인 시스템으로 실험하였으며, 광섬유 RODTR 센서시스템의 측정신호로부터 침입자 신호를 찾아내기 위한 측정신호처리 시스템을 구성하였다. 광섬유 센서의 인가하중과 광손실값과의 관계는 거의 선형적으로 변함을 보였으며, 공간분해능은 2m로 측정되었고, 침입감지면적은 단위길이당 1.3㎡이고, 감도는 0.17dB/kg으로 외부 침입물체등을 감지하기에 충분히 높은 감도와 감지영역을 가짐을 알 수 있다. The developing of buried fiber optic sensor with high sensitivity and broad-area detecting intruders is carried out using fiber optic ROTDR(Rayleigh Optical Time Domain Reflectometry). The sensing part was designed to be able to broad-area detect intrusion effect per optical fiber length underground. The bending light losses in optical fibers are investigated by commercial mini ROTDR with wavelength 1.55㎛, distance range 5km, pulse width 20ns, SNR=5.7. The sensing fibers are selected as the common telecommunication fibers are the 1.5mm, 3.5 mm outer diameter, 4km each length fiber products. Experiments were investigate the characteristics of signal sensitivity according to applied intrusion weight. The relation between the applied weight and the bending loss was almost linear, and broad-area detect intrusion effects are the 2m resolution and 1.3㎡ per optical fiber length respectively. The light loss by the applied weight on fiber was 0.17 dB/kg, that the sensitivity of the optical fiber sensor was sufficient to detect intruders passing over the buried optical fiber.

二軸延伸 폴리프로필렌薄膜의 誘電特性에 미치는 放射線照射의 影響

吳世元,賈出鉉,金旺坤 서울産業大學校 1994 논문집 Vol.39 No.1

Recently, the research on materials required for production of electric and electronic parts has strongly demanded for rapid developement in information industrial structure. But there are many different aging reasons that cause the intrinsic function of these polymers to dectrase when used insulators and dielectrics. In this research, It is studied that the variation of the dielectric characteristics of the specimen(biaxially oriented polypropylene) according to the change with irradiation dose(??Co-?? ray) of the influence of temperature and applied voltage. As for the temperature dependence of dielectric characteristics, the a peak at 110[℃] increases accordingly to the increment of irradiation which is contributed by ???crystal region. The β peak which apperas the orientation by dipoles and molecular motions in the amorphous region at about 60[℃]. For the voltage dependence of tan δat low temperature, the peak of the tan δshifts accordingly to the increasment of irradiation dose towarde the high temperature.

유아간 또래 공동작업에서 인지적 유익성에 따른 집단구성의 원리 모색

류왕효,황윤세 大邱大學校 社會科學硏究所 1999 社會科學硏究 Vol.6 No.1

본 연구의 목적은 더불어 사는 삶이 강조되는 현대사회의 조류에 맞추어 이를 위한 학습형태로 또래 공동작업 형태가 제시되고 있으며, 효과적인 또래 공동작업이 이루어지기 위한 적절한 교수-학습환경을 모색해 보는 데 있다. 위와 같은 문제의식 아래, 또래 공동작업 상황하에서 지적수준에 차이가 있는 유아들의 문제해결과정과 또래 공동작업에 참여한 모든 유아들의 認知發達에 有益한가 그리고 또래 공동작업의 認知的 有益性을 결정하는 要因이 무엇인가를 선행연구를 통해 밝히고자 하며, 인지적으로 유익한 또래 공동작업의 구성원리를 모색해 보고자 한다. 유아간 또래 공동작업에서 인지적 유익성을 결정하는 요인으로는 모델링, 인지적 갈등, 그리고 내면화이다. 즉 모델링의 대상이 있을 때와 사회-인지적 갈등이 발생할 때, 그리고 유아의 내면화 수준에 따라 또래 공동작업의 인지적 유익성이 달라진다고 볼 수 있다. 유아간 또래공동작업의 교수-학습환경 구성시, 또래 공동작업에 참여하는 모든 유아의 인지적 유익성을 고려해야할 것이다 본 연구는 또래 공동작업의 인지적 유익성의 여부, 특히 지적수준에 차이가 있는 유아들의 또래 공동작업에서 상대적 우수아·열등아의 인지발달에 각각 어떤 영향을 주는지를 통하여 또래공동작업의 환경을 어떻게 구성하는 것이 인지발달에 유익한가를 중심으로 이에 관한 이론들을 살펴보고 인지발달에 유익한 또래 공동작업의 집단구성 원리를 모색해 보았다. 도출된 또래 공동작업에서의 집단 구성원리를 적용하여 복합형, 격차형, 그리고 우세형의 세 가지 유형을 제시해 보았다. 그러나 이러한 세 가지 유형을 기본으로 교사는 교실환경에 맞게 응용·적용하여 구성하여야 할 것이다.

성균관대학교 물리학과 방음실의 설계 및 제작

朴興秀,尹錫旺,李聖壽,朴光俊,吳世珍 성균관대학교 기초과학연구소 1986 論文集 Vol.37 No.1

An anechoic chamber was constructed to make to condition of acoustic free field at the Department of Physics, Sung Kyun Kwan University. In this paper the criteria for the design and construction of the anechoic chamber are described. 48cm long wedges of density 15.3kg/㎥ glasswool attached to the 40×20×20㎤ base were used for the lining of anechoic chamber with the cutoff frequency of 125Hz. The interior space of the chamber is 3.56m long, 3.38m wide and 2.37m high.

EduCODE : SCORM 지원 교육용 컨텐츠 개발 방법 Educational Contents Development method for SCORM supporting

서대우,이세훈,왕창종 한국컴퓨터교육학회 2002 컴퓨터교육학회 논문지 Vol.5 No.4

이 논문에서는 교육용 컨텐츠 개발 방법인 EduCODE를 제안하고 이를 지원하는 시스템을 설계 및 구현하였다. EduCODE는 영역 모델, 항해 모델, 추상 인터페이스 모델, 애셋 모델 등 4개의 모델로 구성하였으며, 컨텐츠의 구성을 다이어그램으로 표현할 수 있는 표기법을 제안하였다. EduCODE를 지원하기 위한 자동화 시스템은 저작 모듈과 실행 모듈로 구성되어 있으며, 저작 모듈에서 생성된 각 명세서는 국제적인 교육용 컨텐츠 표준인 ADL SCORM XML 코드를 자동으로 생성하고 실행 모듈과 웹 서버를 통해 서비스된다. In this paper we proposed EduCODE for educational contents development method and designed the system to support EduCODE. There are four models in EduCODE such as domain model, navigation model, abstract interface model, and asset model. The method includs graphic notations for contents structure. The system to support EduCODE consisted of authoring module and run-time module. The authoring module automatically generates ADL SCORM XML code using specifications produced by EduCODE and the code is serviced to a client by run-time module and web server.

협업 여과 기반의 교육용 컨텐츠 추천 시스템 설계

이용준,이세훈,왕창종 한국컴퓨터교육학회 2003 컴퓨터교육학회 논문지 Vol.6 No.2

협업여과는 흥미 있어하는 제품이나 개인화된 자료, 항목을 제공하기 의해 전체 집단의 의견을 반영하는 전자상거래에서 일반적으로 이용되는 기술이다. 협업여과는 정확하고 신뢰할 수 있는 도구로 입증되어 여러 분야의 전자상거래 영역에서 활용되고 있으나 아직까지 교육분야에는 한정적으로 적용되고 있다. 본 논문에서는 교육용 컨텐츠 추천에 사용자의 평가 점수를 이용하는 협업여과 방식의 추천시스템을 설계하였으며, 사용자 정보를 이용하여 추천의 정확도를 향상시키기 위한 유사도 보정기법을 도입하였다. 평균절대오차(MAE)와 반응자작용특성(ROC)값을 이용하여 제안한 시스템이 기존의 협업여과방식보다 추천 효율이 우수함을 검증하였다. Collaborative Filtering is a popular technology in electronic commerce, which adapt the opinions of entire communities to provide interesting products or personalized resources and items. It has been applied to many kinds of electronic commerce domain since Collaborative Filtering has proven an accurate and reliable tool. But educational application remain limited yet. We design collaborative filtering recommendation system using user's ratings in educational contents recommendation. Also We propose a method of similarity compensation using user's information for improvement of recommendation accuracy. The proposed method is more efficient than the traditional collaborative filtering method by experimental comparisons of mean absolute error(MAE) and reciever operating characteristics(ROC) values.

여대생의 생활습관 및 스트레스가 변비에 미치는 영향

문지희,전혜연,강나영,김희정,배나영,양아롬,왕세미,하주영,이자형 이화여자대학교 간호과학대학 2004 이화간호학회지 Vol.- No.38

The purpose of this research is to analyze relationships among the habitual life, stress, and constipation and to help prevent and improve the constipation among women's university students. This is a descriptive interrelated research that has targeted women's university students. The data had been collected for 10 days, from December 22, 2003 to December 31, 2003. The survey was carried out to the 295 women's university students that had been randomly selected by visiting four-year-course colleges and universities in Seoul. The survey consists of 78 questions: five questions on the general trait, 11 questions on the habitual life, 51 questions on the stress, and 11 questions on the constipation. There are seven questions on the dietary life, four questions on exercising, and Shin Jung Ran's survey(2003) and Lee Ji Jung's survey(2001) was used as a reference. Yoon Ho Yul's five grade stress barometer(1996) was also used to measure the amount of stress. The collected data was analyzed by a real number, percentage, the arithmetical mean, the standard deviation, t-test, x²test using SPSS 10.00 for Windows Program. Results are as follow 1. Four to six cups of daily water intake was the highest by 50.0%. Students not have breakfast(55.7%) mostly because they did not have enough time(62.6%). Dinner was the most overeated meal by 72.3% and the most preferred food was meat by 42.0%. In the questions related to exercising, more than half of the students answered that they hardly do not exercise(58%), work out for less than 30minutes(67.3%), and exercised lightly(75.3%). 2. Students were suffering from stresses due to the personal relations(51.36±14.0426), scholastic achievement and personal direction(24.93±8.3037), financial conditions and family matters(20.28±8.1718) and social circumstances(2.7262). 3. In the defection part, the student's reply that they have more than five times of bowel movement on a weekly basis(48.3%), and that it takes three to five minutes to defecate(41.3%) were the highest. More than half of the students answered that their one time excrement quantity was between 30 grams to 60 grams(72.3%) and that it was normal(68.7%). In a question asking how it feels after the defecation(students were allowed to choose more than one answer), relieved and refreshed was the highest by 66.6%, an uncomfortable followed by 42.8%. 4.4% of the students answered that they suffer from strong abdominal pain during the defecation. The rest of the students answered that they do not have stomachache or that it was normal. The students were classified into the constipation group of 103 people(34.9%) and the normal group of 192 people(65.1%) under the devised definition of this research. 4. Students that live in dormitories and do their own cooking were more likely to have constipation than those that live in private residence or in a lodgins. 5. The research showed that there is a mutual relation between water in a day intake and the constipation. It means that the lesser water students drink, the more they suffer from the constipation. The number of times a student had a meal everyday and the constipation was interrelated. If a student had lesser or irregular meals in a day, they had more constipation. Preferred food and constipation was also interrelated. Students that preferred vegetable, fruit, and dairy products were more likely to belong in a normal/general group. 6. By dividing the stress factors into the lower categories, we were able to see that the total stress(t-2.063, p-0.040), personal relations(t-2.316, p-0.021), scholastic achievements and personal directions(t-20127, p-0.034) had mutual relation with the constipation. The constipation group(120.27±30.2708) was suffering from stronger level of stress than the normal group(112.97±28.1466). Through this study, we were able to verify that the few general traits, habitual life, and stress of the women's university students have mutual relations with the constipation.

Dlg5 Regulates Dendritic Spine Formation and Synaptogenesis by Controlling Subcellular <i>N</i>-Cadherin Localization

Wang, Shih-Hsiu J.,Celic, Ivana,Choi, Se-Young,Riccomagno, Martin,Wang, Qiang,Sun, Lu O.,Mitchell, Sarah P.,Vasioukhin, Valera,Huganir, Richard L.,Kolodkin, Alex L. Society for Neuroscience 2014 The Journal of neuroscience Vol.34 No.38

<P>Most excitatory synapses in the mammalian brain are formed on dendritic spines, and spine density has a profound impact on synaptic transmission, integration, and plasticity. Membrane-associated guanylate kinase (MAGUK) proteins are intracellular scaffolding proteins with well established roles in synapse function. However, whether MAGUK proteins are required for the formation of dendritic spines <I>in vivo</I> is unclear. We isolated a novel <I>disc large-5</I> (<I>Dlg5</I>) allele in mice, <I>Dlg5</I><SUP>LP</SUP>, which harbors a missense mutation in the DLG5 SH3 domain, greatly attenuating its ability to interact with the DLG5 GUK domain. We show here that DLG5 is a MAGUK protein that regulates spine formation, synaptogenesis, and synaptic transmission in cortical neurons. DLG5 regulates synaptogenesis by enhancing the cell surface localization of <I>N</I>-cadherin, revealing a key molecular mechanism for regulating the subcellular localization of this cell adhesion molecule during synaptogenesis.</P>

Hydrogen Bonding Dynamics of Phenol-(H₂O)₂ Cluster in the Electronic Excited State: a DFT/TDDFT Study

Wang, Se,Hao, Ce,Wang, Dandan,Dong, Hong,Qiu, Jieshan Korean Chemical Society 2011 대한화학회지 Vol.55 No.3

The time-dependent density functional theory (TDDFT) method has been carried out to investigate the excitedstate hydrogen-bonding dynamics of phenol-$(H_2O)_2$ complex. The geometric structures and infrared (IR) spectra in ground state and different electronically excited states ($S_1$ and $T_1$) of the hydrogen-bonded complex have been calculated using the density functional theory (DFT) and TDDFT method. A ring of three hydrogen bonds is formed between phenol and two water molecules. We have demonstrated that the intermolecular hydrogen bond $O_1-H_2{\cdots}O_3-H$ of the three hydrogen bonds is strengthened in $S_1$ and $T_1$ states. In contrast, the hydrogen bond $O_5-H_6{\cdots}O_1-H$ is weakened in $S_1$ and $T_1$ states. These results are obtained by theoretically monitoring the changes of the bond lengths of the hydrogen bonds and hydrogen-bonding groups in different electronic states. The hydrogen bond $O_1-H_2{\cdots}O_3-H$ strengthening in both the $S_1$ and $T_1$ states is confirmed by the calculated stretching vibrational mode of O-H (phenol) being red-shifted upon photoexcitation. The hydrogen bond strengthening and weakening behavior in electronically excited states may exist in other ring structures of phenol-$(H_2O)_n$. Phenol-$(H_2O)_2$ 착물의 여기상태 수소 결합 동력학을 시간 의존 밀도 함수 이론(TDDFT) 법으로 연구하였다. 수소-결합된 착물에 대한 바닥 상태 및 다른 전자 여기 상태들 ($S_1$와 $T_1$)에서의 기하학적 구조와 IR 스펙트라를 밀도 함수 이론(DFT)와 TDDFT 방법을 사용하여 계산하였다. 페놀과 두 물분자 간에 3개의 수소 결합으로 구성된 고리가 형성되었다. 세 개의 수소 결합에서 분자간 수소결합 $O_1-H_2{\cdots}O_3-H$은 $S_1$ 그리고 $T_1$ 상태에서 더 강해졌지만, 수소결합 $O_5-H_6{\cdots}O_1-H$은 $S_1$과 $T_1$상태에서 약해졌다. 이러한 결과들은 다른 전자 상태에서 수소 결합과 hydrogen-bonding groups의 결합 길이의 변화를 이론적으로 모니터링하여 얻었다. 수소 결합 $O_1-H_2{\cdots}O_3-H$가 $S_1$와 $T_1$ 상태 모두에서 강화된다는 것은 OH(phenol)의 계산된 신축 진동 모드가 광 여기에 의해 적색-이동한다는 것으로부터 확인 되었다. 전자 여기 상태에서 수소 결합이 강해지고 약해지는 행동은 phenol-$(H_2O)_n$의 다른 고리 구조에 존재할 수 있다.