• 대한지리학회지
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• 제48권6호
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• pp.803-818
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• 2013

본 연구에서는 낭만가도에 발달한 총 80개의 바위지형을 조사 분석하였고 다음과 같은 결론을 얻었다. 바위지형 경관이 가장 많이 관찰되는 지역은 양양(43개)이며 사이트별로는 죽도해변(18개)에 가장 밀도 높게 분포한다. 가장 많이 관찰되는 지형단위는 풍화지형(61%)이며 나머지는 해안지형(24%), 구조지형(15%)이다. 풍화지형 중에서는 타포니(33%)가 가장 많고 다음은 핵석(27%), 토르(22%), 나마(10%), 그루브(4%), 박리(4%) 등의 순이다. 학술적 가치, 희소성, 접근성 등을 종합적으로 고려할 때 관광자원 및 지형학 야외 학습장으로 이용 가치가 높은 것으로 판단되는 지형 경관은 35개이다. 이 중 11개 경관이 밀집된 양양 동산해변은 '동산해변 바위공원(가칭)'의 명칭으로 개발하여 관광자원으로 적극 활용해보는 것도 고려해 볼만하다. 지형학 야외학습장으로서 활용가치가 높은 것으로 평가되는 경관은 부채바위, 옵바위 등 총 16개이다. 이들 지역에는 전형적인 풍화지형 경관들이 한 장소에 집중 분포하고 있고, 한 장소에서도 부가적으로 2~3개의 다른 개념의 지형유형을 함께 관찰할 수 있어 효율적인 야외 학습이 가능하다.

• 한국지리정보학회지
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• 제24권2호
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• pp.64-77
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• 2021

본 연구의 목적은 고학력 인적 자본 집단의 공간적 분포를 살펴보고 공간적 분포에 미치는 영향요인을 파악하는 것이다. 본 연구는 지니계수와 탐색적 공간자료분석을 통해 불균형과 공간적 집중정도를 살펴보았으며 공간회귀모형을 통해 고학력 인적 자본 집단의 분포에 미치는 경제적 요인과 어메너티 요인의 영향 정도를 확인하였다. 분석결과, 석·박사 집단 고학력 인적 자본은 불균등하게 분포하고 있으며 수도권을 중심으로 충남 및 강원 일부지역에서 군집을 형성하고 있는 것으로 나타났다. 석·박사 집단 고학력 인적 자본의 분포에 영향을 미치는 영향요인은 경제적 요인이 강하게 작용하고 있었다. 어메너티 요인은 석·박사 집단 고학력 인적 자본의 분포의 영향요인으로서 큰 역할을 하지 못하는 것으로 나타났다. 본 연구의 결과는 인적 자본을 유입하고자 하는 지역경제개발 정책에 있어 시사점이 있다.

• 한국연소학회:학술대회논문집
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• 한국연소학회 제26회 KOSCO SYMPOSIUM 논문집
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• pp.65-73
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• 2003

An experimental study on flame lift-off characteristics of propane jet flame highly diluted with nitrogen has been conducted introducing acoustic forcing with a tube resonant frequency. A flame stability curve is attained according to forcing strength and nozzle exit velocity for $N_2$ diluted flames. Flame lift-off behavior with forcing strength and nozzle exit velocity is globally categorized into three; a well premixed behavior caused by a collapsible mixing for large forcing strength, a coexistent behavior of well-premixed and edge flames interacting with well-organized inner fuel vortices for moderate forcing strengths, and edge flame behavior for small forcing strengths. Special focus is concentrated on the coexistent behavior of the flame base in lifted flame since this may give a hint to a possibility which the flame base behaves like a well-mixed premixed flame in highly turbulent lifted flames. It is also shown that the acoustic forcing to self-pulsating laminar lifted flame affects flame lift-off behavior considerably which is closely related to downstream flow velocity, mixture strength, effective fuel Lewis number, and flame stretch.

• 대한간호학회지
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• 제10권2호
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• pp.63-72
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• 1980

This survey was conducted to provide fundamental data for a practical school health education by grasping the extent to what schoolgirls in Korea made out the conceptions for nutrition often misunderstood. Questionnaires were given to schoolgirls in the 3 classes per grade in a school in Seoul and in the 2 classes in a school in a rural area from the ist grade in the middle school to the 3rd grade in the high school; which were selected at random by school nurses. 96.6% of Questionnaires were collected(total 1,689) and by means of computational treatment of them the anther obtained statistically highly significant results. 1. on the average sghoolgirls had incorrect conceptions on 9.29 items (37.16%) of total 25 items which are often misunderstood. 2. Shoolgirls in higher grades revealed misconceptions on less items than those in lower ones : on 9.56 items in the case of those in the middle school and on 8.82 items in the case of those in the high school. 3. Three major misconceptians of total 25 ones were as follows; (1) Chemical additives are dangerous in food (86.7%). (2) Spinach is a highly concentrated source of vitamins and minerals (82.8% ), (3) The more vitamins you take the better (71.3%).

• Bulletin of the Korean Chemical Society
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• 제35권7호
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• pp.2049-2056
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• 2014

A simple method for exfoliating pristine graphite to yield mono-, bi-, and multi-layers of graphene sheets as a highly concentrated (5.25 mg/mL) and yielded solution in an organic solvent was developed. Pre-thermal treatment of pristine graphite at $900^{\circ}C$ in a sealed stainless steel bath under high pressures, followed by sonication in 1-methyl-2-pyrrolidinone solvent at elevated temperatures, produced a homogeneous, well-dispersed, and non-oxidized graphene solution with a low defect density. The electrical conductivities of the graphene sheets were very high, up to 848 S/cm. These graphene sheets were used to fabricate graphene-polyimide nanocomposites, which displayed a higher electrical conductivity (1.37 S/m) with an improved tensile strength (95 MPa). The synthesized graphene sheets and nanocomposites were characterized by transmission electron microscopy, scanning electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.614-615
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• 2009

For the high reflectance under the ambient light condition, a highly efficient diffractive reflector has been proposed, based on a micro grating structure.[1] This reflector was designed to show highly concentrated distribution of the reflected light to the normal direction of the reflector under specific incident conditions of the light. In order to apply a diffractive reflector to a reflective liquid crystal display, the coupling between the viewing angle characteristics of a liquid crystal (LC) cell and the reflective distribution of the reflector should be considered. Under the optimum configuration confirmed through the analysis of the coupling between a LC cell and a reflector, a reflective vertical alignment (VA) cell with a diffractive reflector shows contrast ratio and brightness much higher than that with a conventional bumpy reflector.

• 농업과학연구
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• 제39권4호
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• pp.583-589
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• 2012

In the continued research on natural fungicides for the control of plant diseases by using plant-derived products, we found that Reynoutria elliptica. had a strong fungicidal activity against several plant pathogens. R. elliptica (3.2 kg) were extracted with 80% aq. MeOH and the concentrated extracted was partitioned with n-hexane, EtOAc, n-BuOH and $H_2O$ successively. The four layers were tested their disease control efficacies against 4 plant disease such as rise blast (RCB), tomato grey mold (TGM), tomato late blight (TLB), and barly powdery mildew (BPM). The n-hexane fraction was highly active showing over 95% control against TLB and BPM. and the EtOAc fraction was highly active showing over 95% control against RCB, TLB, and BPM. By using silica gel chromatography, MPLC, and HPLC, three compounds that were expected to have antifungal activity were isolated. Their chemical structures were elucidated as physcion, emodin, and emodie-8-O-glucoside by EI-MS and NMR spectroscopic analyses.

• 한국수소및신에너지학회논문집
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• 제34권6호
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• pp.785-791
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• 2023

Copper sulfide (Cu_xS) has been extensively utilized as a counter electrode (CE) material for quantum dot solar cells (QDSCs) due to its exceptional catalytic activity for polysulfide electrolytes. The typical fabrication method of Cu₂S CEs based on brass substrate is dangerous, involving the use of a highly concentrated hydrochloric acid solution in a relatively high temperature. In contrast, electroplating presents a safer alternative by employing a less acidic solution at a room temperature. In addition, the electroplating method increases the probability of obtaining CEs of consistent quality compared to the brass method. In this study, the optimized electroplating cycle for CuS CEs in QDSCs has been studied for the highly efficient photovoltaic performances. The QDSCs, featuring electroplated CuS CEs, achieved an impressive efficiency of 7.18%, surpassing the conventional method employing brass CEs, which yielded an efficiency of 6.62%.

• 한국토양비료학회지
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• 제7권3호
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• pp.155-161
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• 1974

약제(藥劑) 무방제상태(無防除狀態)에서 벼에 대한 규산질비료(珪酸質肥料)의 분시효과를 검토(檢討)한 결과(結果) 규회석(珪灰石)이나 합성고농도규산용융물(合成高濃度珪酸熔融物) 공(共)히 전량기비구(全量基肥區)의 규산흡수량(珪酸吸收量)이 전생육기간(全生育期間) 가장 높았으며 생육(生育)이 진행(進行)됨에 따라 분시구(分施區)의 짚중규산함량(中珪酸含量)과의 차이(差異)는 좁혀지고 수확기(收穫期)에는 거의 차이(差異)가 없었다. 비종간(肥種間)에 있어서는 역용성(易溶性) 규산용융물(珪酸熔融物)의 비효가 규회석(珪灰石)보다 높았으며 추비효과도 현저(顯著)하였다. 분시(分施)에 의(依)하여 무방서(無防徐)에 의한 50%의 엽도열병(葉稻熱病) 이병률(罹病率)을 규회석(珪灰石)은 20~40%로 감소(減少)시켰고 합성고농도규산용융물(合成高濃度珪酸熔融物)은 5~15%로 감소(減少)시켰다. 또한 수수도열병(穗首稻熱病)도 무방제구(無防除區)의 50% 이병율(罹病率)을 각각(各各) 20%로, 10%로 감소(減少)시겼다. 즉 규산질비료(珪酸質肥料)의 시비시기(施肥時期)는 전량기비(全量期肥)가 가장 우수(優秀)하나 추비(追肥)로써도 사용(使用)될 수 있으며 최고분벽기(最高分蘗期) 이전(以前)에 시용(施用)되어야 하고 추비용(追肥用) 규산질비료(珪酸質肥料)는 난용성물질(難溶性物質)보다 유효규산함량이 높고 역용성(易溶性) 규산용융물(珪酸熔融物)을 사용(使用)하는 것이 추비효과를 높일 수 있으나 미세분말(微細粉末)의 풍산(風散)과 엽부착등(葉附着等)을 고려(考慮)한 시비방법(施肥方法)이 모색(摸索)되어야겠다.

• Bulletin of the Korean Chemical Society
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• 제33권3호
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• pp.790-794
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• 2012

Trace metal ions such as $Cd^{2+}$, $Ni^{2+}$, and $Zn^{2+}$ in a highly saline sample were subjected to on-line complexation with 4-(2-thiazolylazo) resorcinol (TAR) dissolved in a background electrolyte (BGE) under transient isotachophoresis (TITP) conditions. A long plug of the saline sample, containing the trace metal ions but devoid of TAR, was injected into a coated capillary filled with a BGE composed of 150 mM 2-(cyclohexylamino) ethanesulfonic acid (CHES) and 110 mM triethylamine (TEA) at pH 9.7. Since the electrophoretic mobility of TAR fell between the mobilities of the anionic leading electrolyte ($Cl^-$ in the sample) and the anionic terminating background electrolyte ($CHES^-$), a highly concentrated zone of TAR from the BGE was formed at the rear of the sample matrix and then the metal cations toward the cathode were swept by isotachophoretically assisted on-line complexation (IAOC) between the metal ions and the isotachophoretically stacked TAR. As a result, anionic metal-TAR complexes were formed efficiently, which satisfy the TITP conditions between $Cl^-$ and $CHES^-$. The enrichment factors of metal ions including $Cd^{2+}$ were up to 780-fold compared to a conventional CZE mode using absorbance detection. The detection limits were 17 nM, 15 nM, and 27 nM for $Ni^{2+}$, $Zn^{2+}$, and $Cd^{2+}$ in a 250 mM NaCl matrix, respectively. Our method was successfully applied to the analysis of urine samples without desalting.