• Journal of the Korean Mathematical Society
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• v.58 no.4
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• pp.799-817
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• 2021

In this paper, we investigate the normal and complex symmetric weighted composition operators W_𝜓,𝜑 on the Hardy space H²(𝔻). Firstly, we give the explicit conditions of weighted composition operators to be normal and complex symmetric with respect to conjugations 𝒞₁ and 𝒞₂ on H²(𝔻), respectively. Moreover, we particularly investigate the weighted composition operators W_𝜓,𝜑 on H²(𝔻) which are normal and complex symmetric with respect to conjugations 𝓙, 𝒞₁ and 𝒞₂, respectively, when 𝜑 has an interior fixed point, 𝜑 is of hyperbolic type or parabolic type.

• Bulletin of the Korean Chemical Society
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• v.14 no.2
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• pp.255-258
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• 1993

Molecular dynamics (MD) calculations were carried out in order to investigate the effect of MD cell size to predict the melting phenomena of A-type zeolite. We studied two model systems: a pseudocell of $(T_2O_4Na)_n$, (L= 12.264 $^{\AA}$, N= 84) and a true-cell of (SiAlO$_4Na)_n$. (L= 24.528 $^{\AA}$, N= 672), where T is Si or Al. The radial and bond angle distribution functions of T(Si, Al)-O-T(Si, Al) and diffusion coefficients of T and O were reported at various temperatures. For the true-cell model, the melting temperature is below 1500 K and probably around 1000 K, which is about 600-700 K lower than the pseudocell model. Although it took more time (about 30 times longer) to obtain the molecular trajectories of the true-cell model than those of the pseudocell model, the true-cell model gave more realistic structural transition for the A-type zeolite, which agrees with experiment.

• Entomological Research
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• v.48 no.5
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• pp.405-415
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• 2018

The Macrophya regia group is reviewed and five species are recognized from China, among them two new species, M. acutiserrula Li, Liu & Wei sp. nov. and M. frontalis Li, Liu & Zhu sp. nov., and three known species, M. regia Forsius 1930, M. maculoclypeatina Wei et al. 2003, and M. xiaoi Wei et al. 2003. A key to the Chinese species of the Macrophya regia group are provided.

• Proceedings of the PSK Conference
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• 2002.10a
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• pp.367.2-367.2
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• 2002

Cnidium Rhizome is a frequently prescribed herbal medicine in Korea, Japan as well as China, which has been successfully used in these countries for the treatment of diseases related to. gynecology, blood circulations and dental troublers in the name of 천궁. And it is circulated as the same chinese character, which is 천궁, although original plants are different as Cnidium officinale in pharmacopoeia of Korea or Japan and Ligusticum chuanxiong Hort. In that of China. (omitted)

• Proceedings of the PSK Conference
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• 2002.10a
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• pp.405.2-405.2
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• 2002

A near infrared (NIR) method was developed to analyze specious diversity for morphologically similar umbelliferous herbal medicine. Cnidium officinale Makino. This herbal medicine has been widely used as 'chungung' without any discrimination of its quality and original plants. though it has the ambiguous origins of plants between various countries especially Korea. China and Japan. It is named by Cnidium officinale Makino in Korea and Japan. in comparison with Ligusticum chuanxiong Hort. in China. (omitted)

• Proceedings of the PSK Conference
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• 2003.04a
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• pp.288.1-288.1
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• 2003

The determination method of decursin and decursin angelate from Angelicae gigantis Radix, an important crude drug in oriental medicine, was developed and validated by a reverse-phase liquid chromatography. The decursin and decursin angelate, the structural isomer aspyranocoumarin each other, are the main organic constituents in Angelicae gigantis Radix. (omitted)

• Proceedings of the PSK Conference
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• 2003.10b
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• pp.192.1-192.1
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• 2003

Acanthopanax cortex (Acanthopanax sessiliflorum, Araliaceae, KP VIII), an important herbal drug, has been used as tonic, antistress and immuno-enhancing drugs in Korea. And Peiplocae cortex(Periploca sepium, Asclepiadaceae, CP 2000) has been used as cardiotonic, anti-inflammatory, and sedative effect in china. These are called “Namogapi” of Acanthopanax cortex and “Bukogapi” of Periplocae cortex in Chinese herbal market. These herbal medicines are sometimes circulated as same herbal medicine “Ogapi”. (omitted)

• Proceedings of the PSK Conference
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• 2003.10b
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• pp.199.3-199.3
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• 2003

Acanthopanacis Cortex (Acanthopanax sessiliflorum, Araliaceae, KP VIII), an important Korean medicinal herbal drug, has been widely used as tonic, anti-stress and immuno-enhancing drugs. To monitor the contents of active ingredients (acanthoside D[=eleutheroside E], eleutheroside B, isofraxidin, chlorogenic acid, and caffeic acid) in Acanthopanax sp., we developed the HPLC analysis method and validated. The simultaneous determination of five active ingredients was achieved in a C$\sub$18/ column with an acetonitrile water (containing 1 % phosphoric acid) (15 : 85) mobile phase. (omitted)

• Wind and Structures
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• v.32 no.3
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• pp.219-225
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• 2021

Wind tunnel test models for super tall buildings mainly include synchronized pressure models, high-frequency force balance models, forced vibration models and aeroelastic models. Aeroelastic models, especially MDOF aeroelastic models, are relatively accurate, and designing MDOF model is an important step in aero-model wind tunnel tests. In this paper, the authors propose a simple and accurate design method for MDOF model. The purpose of this paper is to make it easier to design MDOF models without unnecessary experimentation, which is of great significance for the use of the aero-model for tall buildings.

• Nuclear Engineering and Technology
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• v.53 no.4
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• pp.1250-1258
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• 2021

In this paper, the mechanical performance of cracked surface-coated Zircaloy cladding, which has different coating materials, coating thicknesses and initial crack lengths, has been investigated. By analyzing the stress field near the crack tip, the safety zone range of initial crack length has been decided. In order to determine whether the crack can propagate along the radial (r) or axial (z) directions, the energy release rate has been calculated. By comparing the energy release rate with fracture toughness of materials, we can divide the initial crack lengths into three zones: safety zone, discussion zone and danger zone. The results show that Cr is suitable coating material for the cladding with a thin coating while Fe-Cr-Al have a better fracture mechanical performance in the cladding with thick coating. The Si-coated and SiC-coated claddings are suitable for reactors with low power fuel elements. Conclusions in this paper can provide reference and guidance for the cladding design of nuclear fuel elements.