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Measurement of alumina film induced ablation of internal insulator in solid rocket environment

Defence Technology（防务技术） 2023年第11期29卷 181-192页

作者： Ji-Yeul Bae In Sik hwang Yoongoo Kang Agency for Defense Development 160488th Bukyuseong-streetDaejeonSouth Korea

This study investigates the ablation of internal insulation induced by the deposition of an alumina film with different lateral film speeds.A sub-scale test solid rocket motor(SRM)was designed in an impinging jet configuration to form an alumina film on the sample and to encourage the lateral movement of the film by a high-speed wall *** static fire tests of the test SRM were conducted with six different jet velocities(V_(jet)=100 m/s,150 m/s,200 m/s,268 m/s,330 m/s,and 450 m/s)that indirectly affected the velocity of the wall jet and the deposition rate of alumina *** ablation velocity was deduced from the difference in the sample thickness after a test using a coordinate measuring *** droplet deposition mass flux and wall jet velocity were obtained via two-phase flow simulation with the same jet velocity and effective *** a result,the characteristics of alumina-induced ablation and the changes in ablation with jet velocities were *** area within0.8×jet diameter was focused upon,where the ratio of ablation velocity to incoming alumina mass was constant for each jet velocity,and showed a similarity in jet *** the ablation velocity was increased from 2.05 to 9.98 mm/s with increasing jet velocity,the ratio of the ablation velocity and alumina mass flux decreased from 1.07×10^(-4)to 0.49×10^(-4)m^(3)/kg as Al_(2)O_(3)-C reactions became less efficient with a reduced residence time of the *** the decrease in residence time by the wall jet is more pronounced for slow reactions involved in Al_(2)O_(3)-C reactions,fast reactions in Al_(2)O_(3)-C reactions are less affected and result in a convergence of the volumetric rate of ablation per unit mass of alumina.

关键词： Internal insulation Solid rocket motor Ablation Alumina

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Multi-party quantum secret sharing based on two special entangled states

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Science China(Physics,Mechanics & Astronomy) 2012年第3期55卷 460-464页

作者： TSAI ChiaWei hwang Tzonelih Computer Science and Information Engineering Department National Chengkung University

A multi-party quantum secret sharing protocol using two entangled states, φ0〉 = 1/√2 （1＋）n ＋ 1-）n） and （φ1）1） =1/√2 （1＋）n -1-〉n）, is proposed and analyzed. In this protocol, without requiring to generate any photon or do any local unitary operation, an agent can obtain a shadow of the secret key by simply performing a measurement of single photon. Furthermore, the security of the protocol is analyzed. It shows that no agent can obtain the manager＇s secret without the help of the other agents, and any eavesdropper will be detected if he/she tries to steal the manager＇s secret under ideal or noisy quantum channels.

关键词： entangled state local unitary operation measurement of single photon

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Enhancing polyphenol extraction from unripe apples by carbohydrate-hydrolyzing enzymes

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2009年第12期10卷 912-919页

作者： In-Wook hwang Shin-Kyo CHUNG Department of Food Science and Technology Kyungpook National University Daegu 702-701 Korea

The effects of process variables such as enzyme types, enzyme ratio, reaction temperature, pH, time, and ethanol concentration on the extraction of unripe apple polyphenol were investigated. The results indicated that Viscozyme L had the strongest effect on polyphenols extraction and was selected to study the polyphenol composition. The ratio of enzyme （Viscozyme L） to sobstrate （2 fungal beta-glucanase units （FBG）） at 0.02, reaction at pH 3.7, 50℃ for 12 h, and ethanol concentration of 70% were chosen as the most favorable extraction condition. Total phenolic content （TPC）, reducing sugar content （RSC）, and extraction yield increased by about 3, 1.5, and 2 times, respectively, compared with control. The contents ofp-coumaric acid, ferulic acid, and caffeic acid increased to 8, 4, and 32 times, respectively. The enzyme-aided polyphenol extraction process from unripe apples might be applied to food industry for enhancing bioactive compound production.

关键词： Carbohvdrate-hvdrolvzim enzvmes. Unrioe aonles. Polvnhenol extraction. Caffeic acid

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Deterministic quantum communication using the symmetric W state

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Science China(Physics,Mechanics & Astronomy) 2013年第10期56卷 1903-1908页

作者： TSAI Chia-Wei hwang Tzonelih Smart Network System Institute at Institute for Information Industry Department of Computer Science and Information Engineering National Cheng Kung University

This study proposes a new coding function for the symmetric W state. Based on the new coding function, a theoretical protocol of deterministic quanama communication （DQC） is proposed. The sender can use the proposed coding function to encode his/her message, and the receiver can perform the imperfect Bell measurement to obtain the sender＇s message. In comparison to the existing DQC protocols that also use the W class state, the proposed protocol is more efficient and also more practical within today＇s technology. Moreover, the security of this protocol is analyzed to show that any eavesdropper will be detected with a very high probability under both the ideal and the noisy quantum channel.

关键词： deterministic quantum communication symmetric W state imperfect Bell measurement

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Dormancy and the influence of photoperiod and temperature on sexual maturity in Nicrophorus nepalensis （Coleoptera： Silphidae）

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Insect Science 2011年第2期18卷 225-233页

作者： Wenbe hwang Shiuh-Feng Shiao Department of Ecoscience and Ecotechnology National University of Tainan Department of Entomology National Taiwan University Taiwan China

Carrion beetles （Nicrophorus spp.） use small vertebrate carcasses for food and reproduction. Their ecology and behaviors are highly affected by the availability of carcasses and the surrounding environmental conditions. Our results revealed that in subtropical Fushan, northern Taiwan, N. nepalensis was mainly active in spring （February to May）, and could also be found in autumn （October and November）; but there was no capture record in summer （June to September） and winter （December and January）. A laboratory temperature tolerance study indicated that N. nepalensis adults become inactive at temperatures above 26℃, and had the highest mortality when the temperature was raised from 27℃ to 28℃. Furthermore, N. nepalensis became sexually mature at 20℃, depending on the photoperiod： the longer the day, the lower the percentage of sexually mature 2-week-old females after emergence. In another experiment, N. nepalensis virgins were paired under three possible conditions at Fushan. At 15℃ and 20℃, if carcasses were presented to the pairs within 3 days after emergence, all laid eggs in the second week after emergence. If carcasses were presented 1 week after emergence, most began to reproduce at 20℃ with 12.5 h of daylight. However, at 15℃ with 1 l h of daylight, the carrion beetles hibernated first, and reproduced in the ninth week after emergence. At 25℃ with 14 h of daylight, carrion beetles did not bury the mouse carcasses, the females did not lay eggs, and the adult lifespan was only one-third of that at 20℃. This study revealed that both photoperiod and temperature influence the time needed to reach the sexual maturity of N. nepalensis; and also implied that the narrow temperature tolerance range and dormancy behavior of carrion beetles are highly regulated by those environmental factors.

关键词： dormancy Nicrophorus photoperiod reproductive biology temperaturetolerance sexual maturity

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Automated Service Search Model for the Social Internet of Things

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Computers, Materials & Continua 2022年第9期72卷 5871-5888页

作者： Farhan Amin Seong Oun hwang Department of Computer Engineering Gachon UniversitySeongnam13120Korea

The social internet of things(SIoT)is one of the emerging paradigms that was proposed to solve the problems of network service discovery,navigability,and service *** SIoT aims to socialize the IoT devices and shape the interconnection between them into social interaction just like human *** IoT,an object can offer multiple services and different objects can offer the same services with different parameters and interest *** proliferation of offered services led to difficulties during service customization and service *** problem is known as service *** selection of suitable service that fits the requirements of applications and objects is a challenging *** address these issues,we propose an efficient automated query-based service search model based on the local network navigability concept for the *** the proposed model,objects can use information from their friends or friends of their friends while searching for the desired services,rather than exploring a global *** employ a centrality metric that computes the degree of importance for each object in the social IoT that helps in selecting neighboring objects with high centrality *** distributed nature of our navigation model results in high scalability and short navigation *** verified the efficacy of our model on a real-world SIoT-related *** experimental results confirm the validity of our model in terms of scalability,navigability,and the desired objects that provide services are determined quickly via the shortest path,which in return improves the service search process in the SIoT.

关键词： Social internet of things service discovery local navigability object discovery query generation model

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Spatial and spectral measurement of laser-driven protons through radioactivation

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Nuclear Science and Techniques 2023年第12期34卷 30-39页

作者： Yin‑Ren Shou Xue‑Zhi Wu Gwang‑Eun Ahn Seung yeon Kim Seong Hoon Kim hwang Woon Lee Jin Woo Yoon Jae Hee Sung Seong Ku Lee Xue‑Qing Yan Il Woo Choi Chang Hee Nam Center for Relativistic Laser Science Institute for Basic ScienceGwangju 61005Republic of Korea School of Physics Peking UniversityBeijing 100871China Advanced Photonics Research Institute Gwangju Institute of Science and TechnologyGwangju 61005Republic of Korea Department of Physics and Photon Science Gwangju Institute of Science and TechnologyGwangju 61005Republic of Korea

The simultaneous measurement of the spatial profile and spectrum of laser-accelerated protons is important for further optimization of the beam qualities and *** report a detailed study regarding the underlying physics and regular procedure of such a measurement through the radioactivation of a stack composed of aluminum,copper,and CR-39 plates as well as radiochromic films(RCFs).After being radioactivated,the copper plates are placed on imaging plates(IPs)to detect the positrons emitted by the reaction products through contact *** spectrum and energy-dependent spatial profile of the protons are then obtained from the IPs and confirmed by the measured ones from the RCFs and CR-39 *** also discuss the detection range,influence of electrons,radiation safety,and spatial resolution of this ***,insights regarding the extension of the current method to online measurements and dynamic proton imaging are also provided.

关键词： Laser-driven proton acceleration Proton-induced nuclear reaction Radioactivation measurement Contact imaging

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Development of high performance and high strength heavy concrete for radiation shielding structures

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International Journal of Minerals,Metallurgy and Materials 2011年第1期18卷 89-93页

作者： Yu-Chu Peng Chao-Lung hwang Graduate Institute of Construction Engineering Taiwan University of Science and Technology Taipei 11243 China Taipei Department of Resort and Leisure Management Taiwan Hospitality ＆ Tourism College Taipei 11243 China Taipei

Heavy concrete currently used for construction contains special materials that are expensive and difficult to work *** study replaced natural aggregate（stones） in concrete with round steel balls,which are inexpensive and easily *** diameters of the steel balls were 0.5 and 1 cm,and their density was 7.8 kg/*** packing mixture methods were used to produce heavy concrete with densities of 3500 and 5000 kg/*** various properties of this concrete were tested according to the standards of the American Society for Testing and Materials（ASTM）.The results indicated that the construction slump of the concrete could reach 260-280 mm and its slump flow could reach 610-710 *** important,its compressive strength could reach 8848 *** results will significantly alter traditional construction methods that use heavy concrete and enhance innovative ideas for structural design.

关键词： radiation shielding composite structures concretes concrete construction materials properties

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Both metaxin and Tom20 together with two mitochondria-specific motifs support mitochondrial targeting of dual-targeting AtSufE1

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Journal of Integrative Plant Biology 2022年第8期64卷 1596-1613页

作者： Seungjin Woo Byeongho Moon Inhwan hwang Department of Life Sciences Pohang University of Science and TechnologyPohang 790‐784Korea

Plant cells have two endosymbiotic organelles,chloroplasts,and *** organelles perform specific functions that depend on organelle-specific *** majority of chloroplast and mitochondrial proteins are specifically imported by the transit peptide and presequence,***,a significant number of proteins are also dually targeted to these two ***,it is not fully understood how proteins are dually targeted to both chloroplasts and *** this study,the mechanism underlying mitochondrial targeting of dual targeting At Suf E1 in Arabidopsis was *** N-terminal fragment containing 80 residues of AtSufE1(AtSufE1N80)was sufficient to confer dual targeting of reporter protein,At SufE1N80:GFP,in *** sequence motifs,two arginine residues at 15and 21positions,and amino acid(aa)sequence motif AKTLLLRPLK from the 31to 40aa position,were responsible for targeting to mitochondria a portion of reporter proteins amid the chloroplast *** sequence motif PSEVPFRRT from the 41 stto 50 thaa position constitutes a common motif for targeting to both chloroplasts and *** mitochondrial import of At Suf E1:N80,Metaxin played a critical *** addition,Bi FC and protein pull-down experiments showed that At Suf E1N80 specifically interacts with import receptors,Metaxin and *** interaction of At Suf E1N80 with Metaxin was required for the interaction with *** on these results,we propose that mitochondrial targeting of dual-targeting At Suf E1 is mediated by both mitochondria-specific and common sequence motifs in the signal sequence through the interaction with import receptors,Metaxin and Tom20,in a successive manner.

关键词： AtSufE1 chloroplasts common motif dual targeting metaxin mitochondria mitochondria-specific motif Tom20

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A probabilistic model of quantum states for classical data security

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Frontiers of physics 2023年第5期18卷 281-292页

作者： Muhammad Waseem Hafiz Seong Oun hwang Department of IT Convergence Engineering Gachon UniversitySeongnam 13120South Korea Department of Computer Engineering Gachon UniversitySeongnam 13120South Korea

The phenomenal progress of quantum information theory over the last decade has substantially broadened the potential to simulate the superposition of states for exponential speedup of quantum algorithms over their classical ***,the conventional and modern cryptographic standards(encryption and authentication)are susceptible to Shor’s and Grover’s algorithms on quantum *** significant improvement in technology permits consummate levels of data protection by encoding classical data into small quantum states that can only be utilized once by leveraging the capabilities of quantum-assisted classical *** the frequent data breaches and increasingly stringent privacy legislation,we introduce a hybrid quantum-classical model to transform classical data into unclonable states,and we experimentally demonstrate perfect state transfer to exemplify the classical *** alleviate implementation complexity,we propose an arbitrary quantum signature scheme that does not require the establishment of entangled states to authenticate users in order to transmit and receive arbitrated states to retrieve classical *** consequences of the probabilistic model indicate that the quantum-assisted classical framework substantially enhances the performance and security of digital data,and paves the way toward real-world applications.

关键词： information security quantum-classical cryptography quantum information processing quantum spin states spin-1/2 algebra user authentication

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