• 한국자기공명학회논문지
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• 제19권1호
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• pp.18-22
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• 2015

The structural geometry of $[N(CH_3)_4]_2CdCl_4$ in a hexagonal phase is studied by $^1H$ MAS NMR, $^{13}C$ CP/MAS NMR, and $^{14}N$ NMR. The changes in the chemical shifts for $^{13}C$ and $^{14}N$ in the hexagonal phase are explained by the structural geometry. In addition, the temperature dependencies of the spin-lattice relaxation time in the rotating frame $T_{1{\rho}}$ for $^1H$ MAS NMR and $^{13}C$ CP/MAS NMR are measured.

• 정보보호학회지
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• 제32권4호
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• pp.33-40
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• 2022

최근 전 세계가 COVID-19 팬데믹을 겪으면서 실세계 속 사회 및 문화 활동이 온라인 등 비대면으로 옮겨지며 비대면 사회활동 및 가치 창출을 위한 메타버스 플랫폼들이 생겨나기 시작하고 이들의 사회적 파급력 및 가치가 높아지고 있다. 메타버스 플랫폼에서 수행되는 사회 및 문화 활동의 가치가 높아짐에 따라 메타버스 플랫폼은 해커에게 '저비용 고효율'적인 공격 대상이 되어 메타버스의 안전성 및 보안성 이슈가 화두가 되고 있다. 본 논문에서는 메타버스 플랫폼을 대표하는 'ZEPETO^TM', 'Roblox^TM', '어스2^TM' 등의 메타버스 플랫폼에서 발생한 보안사고의 공격 지점 및 연관된 공격 체인을 조사하고 메타버스를 구성하고 있는 핵심 시스템 요소에 대한 위협벡터를 도출하였다. 본 연구 수행에서 활용한 방법론은 메타버스 플랫폼뿐만 아니라 신규 소프트웨어 기반 플랫폼이 출시될 때의 위협벡터를 도출하고 그에 따른 보안대책 수립을 위한 활용으로 사용될 수 있다.

• Nonlinear Functional Analysis and Applications
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• 제27권2호
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• pp.271-287
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• 2022

In this article, we shall prove a common fixed point theorem for two weakly compatible self-maps 𝒫 and 𝔔 on a dislocated metric space (M, d^*) satisfying the following ξ-weakly expansive condition: d^*(𝒫c, 𝒫d) ≥ d^* (𝔔c, 𝔔d) + ξ(∧(𝔔c, 𝔔d)), ∀ c, d ∈ M, where $${\wedge}(Qc,\;Qd)=max\{d^*(Qc,\;Qd),\;d^*(Qc,\;\mathcal{P}c),\;d^*(Qd,\;\mathcal{P}d),\;\frac{d^*(Qc,\;\mathcal{P}c){\cdot}d^*(Qd,\;\mathcal{P}d)}{1+d^*(Qc,\;Qd)},\;\frac{d^*(Qc,\;\mathcal{P}c){\cdot}d^*(Qd,\;\mathcal{P}d)}{1+d^*(\mathcal{P}c,\;\mathcal{P}d)}\}$$. Also, we have proved common fixed point theorems for the above mentioned weakly compatible self-maps along with E.A. property and (CLR) property. An illustrative example is also provided to support our results.

• Kyungpook Mathematical Journal
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• 제64권1호
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• pp.113-131
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• 2024

In this paper we give conditions for the existence of, and describe the asymtotic behavior of, radial positive solutions of the nonlinear elliptic equation of Emden-Fowler type with convection term ∆_p u + 𝛼|u|^q-1u + 𝛽x.∇(|u|^q-1u) = 0 for x ∈ ℝ^N, where p > 2, q > 1, N ≥ 1, 𝛼 > 0, 𝛽 > 0 and ∆_p is the p-Laplacian operator. In particular, we determine ${\lim}_{r{\rightarrow}}{\infty}\,r^{\frac{p}{q+1-p}}\,u(r)$ when $\frac{{\alpha}}{{\beta}}$ > N > p and $q\,{\geq}\,{\frac{N(p-1)+p}{N-p}}$.

• 유통과학연구
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• 제17권4호
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• pp.27-32
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• 2019

Purpose - The business model is a method of creating corporate value, in existing "classification of business model", limitations and redundancy phenomena are applied when a new type flows in, and as consumer's purchasing decision of consumer behavior 5 steps. The classification schemes can be used for more accurate data analysis by proposing a new mapping technique in the fourth industry. Research design, data, and methodology - It was far more classified on the business model (BMS by BDS), and so on. Designing the new horizons of logistics, marketing, methodology by reclassifying these existing data to new useful data with the old methods, in order to analyze the areas where the problem has been raised for the point that the existing methods are not suitable configured. This will be applicable to the system of quaternary industry from the perspective of the buyer. Results - The mapping results of the consumer purchase decision were as follows,the 1^st stage (interest) was 23.73%, 2^nd stages (publicity) 33.90%, 3^rd stages (sales) 13.56%, 4^th stages (decision) 11.86%, 5^th stages (repurchaser) 16.95%. This verified that "the business model can be classified through "BMS by BDS". Conclusions - This structural classification is the basis of logistics marketing in the 4th industry, and proposes a innovative and effective model of constructing theory.

• 한국지구과학회지
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• 제42권4호
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• pp.425-444
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• 2021

Investigating the physical and chemical properties of riverine wetlands is necessary to understand their distribution characteristics and depositional environment. This study investigated the physical (particle size, color, and type) and chemical properties (organic, inorganic, and moisture contents) of sediments in Samrak wetland, located in the Nakdong River estuary area in Busan, South Korea. The particle size analysis indicated that the hydraulic conductivity values for the coarse grain and the mixture of coarse and fine grains ranged from 2.03 to 3.49×10^-1 cm s^-1 and 7.18×10^-3 to 1.24×10^-7 cm s^-1, respectively. In-situ water quality and laboratory-based chemical analyses and radon-222 measurement were performed on groundwater and surface water in the wetland and water from the nearby Nakdong River. The physical and chemical properties of Samrak wetland was characterized by the sediments in the vertical and lateral direction. The concentrations of chemical components in the wetland groundwater were distinctly higher than those in the Nakdong River water though the wetland groundwater and Nakdong River water equally belonged to the Ca-HCO₃ type.

• 농업과학연구
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• 제51권2호
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• pp.205-216
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• 2024

Although Aster yomena has recently attracted attention for its potential anti-cancer, antimicrobial, and immune-boosting effects, there are concerns about residual pesticides because they are consumed in salad-like forms. This study investigated residual characteristics and human dietary risks of the imidazole fungicide prochloraz applied to the herbal medicine Aster yomena with different spray frequency and timing. Residual analysis of prochloraz and its three main metabolites (BTS44595, BTS44596, and 2,4,6-trichlorophenol) in Aster yomena samples was performed using the QuEChERS method and LC-MS/MS. Mean recovery rates of the fungicide and its metabolites were satisfactory in the range of 80.1 ± 1.2% to 108.2 ± 3.8%. The residual concentration of the fungicide calculated as the sum of prochloraz and its metabolites was the highest (4.14 mg·kg^-1) in the Aster yomena sample applied three times at weekly intervals with the fungicide until immediately before harvest. The fungicide residue concentration in the Aster yomena was below the method-limit of quantification (MLOQ) when it was applied twice at the interval of 9 day until 21 days before harvest. The theoretical maximum daily intake of prochloraz, calculated based on the daily intake of Aster yomena, mean adult body weight, and the highest residue level analyzed in the this study, was safe at < 80% of the acceptable daily intake of the fungicide (0.01 mg^-1·kg·bw^-1·day). In conclusion, the triple application method with prochloraz at weekly intervals until the harvest day is recommended to produce safe Aster yomena from the fungicide residues and risks to humans.

• 대한약학회:학술대회논문집
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• 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.1
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• pp.125.1-125.1
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• 2002

• 한국세라믹학회지
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• 제39권6호
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• pp.610-615
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• 2002

Perovskite 구조를 나타내는 L $a_{0.6}$B $a_{0.4}$I $n_{1-y}$ $M_{y}$ $O_{3{\delta}}$(M=G $a^{3+}$ , S $c^{3+}$ , Y $b^{3+}$ )계 조성의 생성상과 proton 전도성을 관찰하였다. G $a^{3+}$ 이온이 25at% 첨가된 조성은 입방정 단일상을 나타낸 반면 50at% 첨가된 조성에서는 입방정상과 이차상이 함께 생성되었다. S $c^{3+}$ 이온 및 Y $b^{3+}$ 이온이 25at%와 50at%씩 첨가된 조성은 모두 입방정 단일상을 나타내었다. 양이온을 25at% 첨가한 조성에 대해 wet $N_2$ 분위기(P $h_{H_2O}$=6.1hPa)에서 전도도를 측정한 결과, S $c^{3+}$ 이온 및 Y $b^{3+}$ 이온이 첨가된 조성은 proton 전도를 나타내었다.

• Fisheries and Aquatic Sciences
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• 제24권2호
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• pp.99-107
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• 2021

Water temperature (WT) is a major environmental factor of metabolic rate in fish; it directly affects food intake, ammonia excretion, oxygen consumption (OC), growth, and survival. Thus, the purpose of this study was to investigate changes in the OC and the hematological response of olive flounder Paralichthys olivaceus because of WT changes. In Exp. I, WT was increased from 20℃ to 29℃ within 18 h and maintained at 29℃ for 96 h. Then, WT was decreased from 29℃ to 20℃ within 18 h and maintained at 20℃ for 24 h. In Exp. II, WT was decreased from 20℃ to 11℃ within 18 h and maintained at 11℃ for 96 h. Then, WT was increased from 11℃ to 20℃ within 18 h and maintained at 20℃ for 24 h. The Exp. III maintained that the Exp. I and II was consecutively. In Exp. I, the OC increased from 116.7 mg O₂ kg^-1 hr^-1 to 317.5 mg O₂ kg^-1 hr^-1 with increasing WT. In Exp. II, the OC decreased from 96.5 mg O₂ kg^-1 hr^-1 to 71.3 mg O₂ kg^-1 hr^-1 with decreasing WT. In Exp. III, OC tended to increase or decrease in inverse proportion to temperature. In Exp. I, cortisol, glucose, and aspartate aminotransferase (AST) values increased with increasing WT. In Exp. II, Cl^-, osmolality, AST, and alanine aminotransferase (ALT) values significantly changed during the experimental period: glucose values increased, whereas cortisol values decreased with decreasing WT. Exp. III was shown to be a more stressful environment to olive flounder than Exp. I and Exp. II. The results of our study will be useful for evaluating current aquaculture procedures of olive flounder and developing techniques to minimize stress in aquaculture farms.