Risk Factors for Pulmonary Cement Embolism (PCE) After Polymethylmethacrylate Augmentation: Analysis of 32 PCE Cases

Huizhi Guo,Huasheng Huang,Yang Shao,Qiuli Qin,De Liang,Shuncong Zhang,Yongchao Tang 대한척추신경외과학회 2021 Neurospine Vol.18 No.4

Objective: Pulmonary cement embolism (PCE) is an underestimated but potentially fatal complication after cement augmentation. Although the treatment and follow-up of PCE have been reported in the literature, the risk factors for PCE are so far less investigated. This study aims to identify the preoperative and intraoperative risk factors for the development of PCE. Methods: A total of 1,373 patients treated with the polymethylmethacrylate (PMMA) augmentation technique were retrospectively included. Patients with PCE were divided into vertebral augmentation group and screw augmentation group. Possible risk factors were collected as follows: age, sex, bone mineral density, body mass index, diagnosis, comorbidity, surgical procedure, type of screw, augmented level, number of augmented vertebrae, fracture severity, presence of intravertebral cleft, cement volume, marked leakage in the paravertebral venous plexus, and periods of surgery. Binary logistic regression analyses were used to analyze independent risk factors for PCE. Results: PCE was identified in 32 patients, with an incidence rate of 2.33% (32 of 1,373). For patients who had undergone vertebral augmentation, marked leakage in the paravertebral venous plexus (odds ratio [OR], 1.2; 95% confidence interval [CI], 0.1–10.3; p=0.000) and previous surgery (OR, 16.1; 95% CI, 4.2–61.0; p=0.007) were independent risk factors for PCE. Regarding patients who had undergone screw augmentation, the marked leakage in the paravertebral venous plexus (OR, 4.2; 95% CI, 0.5–37.3; p=0.004) was the main risk factor. Conclusion: Marked leakage in the paravertebral venous plexus and previous surgery were significant risk factors related to PCE. Paravertebral leakage and operator experience should be concerned when performing PMMA augmentation.

Trump Administration’s Korean Nuclear Crisis Management and Prospects for Solution

( Huizhi Zhang ),( Xiaotong Zhang ) 한국국방연구원 2020 The Korean Journal of Defense Analysis Vol.32 No.3

The Korean nuclear crisis in 2017 was essentially a brinkmanship policy crisis deliberately created by the Trump administration. That is to say, the Trump administration forced the Democratic People’s Republic of Korea (DPRK) to choose between war and concession by imposing “maximum pressure,” so as to promote the process of denuclearization of the Korean Peninsula. However, due to the DPRK’s hedging strategy, U.S. domestic political constraints, and lack of international cooperation, the negotiation between the United States and the DPRK reached a stalemate. There even had been a debate in the United States over whether or not the government would acquiesce to the DPRK being a nuclear state. If any real progress is to be achieved, the Trump administration must set limited goals under a practical scheme. And at the same time, the UN Security Council should formulate reversible provisions to restrain the United States and the DPRK from failing to keep their promises. It should also reduce the negative impact of the lack of mutual trust between the two countries with a guarantee of the international community, thereby accelerating the peace process of denuclearization of the Korean Peninsula.

CuMOF-decorated biodegradable nanofibrous membrane: facile fabrication, high-efficiency filtration/separation and effective antibacterial property

Huizhi Wu,Qian Geng,Yonghan Li,Yuqian Song,Jiaqi Chu,Rong Zhou,Xin Ning,Senjie Dong,Ding Yuan 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-

Here, a multifunctional poly (lactic acid)/copper-based metal–organic framework (PLA/CuMOF) degradablecomposite membrane featuring superior antibacterial and self-cleaning properties was fabricated viaa simple electrospinning process for high- efficiency filtration/separation. Benefiting from the decrease offiber diameter, the improved surface roughness and the surface charge of CuMOF, PLA/CuMOF fibrousmembrane achieved excellent capture ability for ultra-fine particles and superb purification capabilityfor real PM2.5 smoke. The differences of filtration capacity between PLA membrane and PLA/CuMOF membranewas further explored using analogue simulation with dynamic particle capture and airflow fielddistribution. Impressively, PLA/CuMOF fibrous membrane combines robust self-cleaning ability, effectiveantibacterial effect, and thermal management capability. Moreover, owing to the special selective wettabilityand chemical stability, PLA/CuMOF membrane possessed the stable oil–water separation performanceunder harsh environment (e.g., high acid, alkali, and salt). This degradable multifunctionalfiltration/separation fibrous membrane emerges a broad application prospect ranging from environmentalgovernance, industrial security to personal protection.

[발표·PRESENTATION] 대북정책에 대한 중미 양국간 경쟁과 협력

장혜지(Zhang, Huizhi) 전남대학교 글로벌디아스포라연구소 2015 전남대학교 세계한상문화연구단 국제학술회의 Vol.2015 No.6

China and U.S. have common interests like denuclearization, nonproliferation and stability of the region on Korean issues, but also conflicting interests as DPRK’s ideology and the way of the denuclearization. It is clear to see the the strengths, weaknesses, opportunities and threats of two countries through the SWOT model to compare China and U.S.’ policies toward DPRK. If the two countries only pay attention to their own strength and opportunity, China emphasizes the importance of the peace and stability, U.S.’s emphasizes the urgency of denuclearization, which will increase the competitiveness of the two countries and is unfavorable for the cooperation. The root of the competition between China and U.S. is the structural contradictions between the rise country and hegemony countries, China’s intention is to maintain the buffer zone of geopolitical security and forefront of the economic development, but U.S. hopes to contain emerging powers. U.S.’s attempt to contain regional power and neglect to DPRK’s security are the main causes why the Sino-U.S. Cooperation is difficult to make progress. If the two countries can face the conflicting interests between them, reduce the expect of support from each other, which will prevent the volatility of regional situation and bilateral relations. According to the instability of the situation on the Korean peninsula, between China and U.S. should strengthen the security dialogue, building area crisis management mechanism, avoid by North Korean peninsula undergo malignant competition and trigger positive conflict.

外資誘致 戰略과 投資優位要素의 聯關性에 관한 論考 : 中國 吉林省政府의 사례를 中心으로

張慧智 경희대학교 산업관계연구소 2009 産硏論叢 Vol.34 No.-

중국 길림성의 외자기업을 중심으로 외자유치의 문제점을 분석하고 이에 대한 대책과 전략을 알아본다. 일반적으로 투자지역을 선택할 때 투자지역의 입지 뿐 만 아니라 기업 특유의 장점이나 기업발전 전략 등 여러 가지 요소의 영향 여부를 고려한다. 투자를 유치하고자 하는 지역의 투자환경이 개선된다면 입지적 우위를 얻을 수 있다. 길림성의 입지적 요인을 살펴보면, 외자유치에 있어서 금융신용환경이 열악하고 교통 및 물류시설이 부족하여 물류비용이 높다. 산업결합 능력이 떨어져 기업 시너지 효과를 얻을 수 있는 조건이 형성되지 않았고 기업 친화적인 정부의 정책이나 환경이 조성되지 못한 단점이 있다. 따라서 외국 자본의 투자환경을 개선해야만 투자 의도를 가진 채 투자를 주저하는 해외자본의 투자를 촉진할 수 있다고 본다. In this paper the strategy to induce the foreign investment into Jilin province and its problems would be analyzed. According to eclectic theory, ownership-specific advantage, strategic development plan and location–specific advantage should be considered as important factors to promote the FDI. The improvement of the investment environments is the unique factor to enhance the location-specific advantage of the host country. As far as the location–specific factors of the Jilin province are concerned, the bad financial credit environment and the insufficient facilities regarding the transportation and physical distribution caused the highly expensive logistics cost. Low organization of the industrial clusters to enhance the industrial synergy effects and lack of the business-friendly government policy and environment are considered to be the main disadvantages of the Jilin province. In order to attract the foreign investments into Jilin Province, sustainable policy to improve the investment environments should be implemented.

중한FTA체결이 양국 전자제품 무역에 미치는 영향

장혜지;조령 경희대학교 산업관계연구소 2011 産硏論叢 Vol.36 No.-

한중간 FTA에 관한 연구는 2004년 이래 많은 연구가 진행되었다. 한중간 무역에 있어서 전자제품은 막대한 비중을 차지하고 있으며. 주로 강력한 경쟁력과 상호보완성으로 인하여 치열한 경쟁을 겪었다. 본 연구는 관세면제가 실시되는 경우에 양국의 전자제품의 무역창조효과를 예측하는데 있다. 본 연구에서는 계산 가능한 일반균형 모형(CGE model)을 사용하고 있으며 이모형은 경험적 분석의 유용한 방법론 중에 하나이다. 양국의 현재의 무역관계를 감안하여 본 연구는 장차 양국간 FTA체결을 위한 중국 전자산업에 대한 정책 권고도 제시하고 있다. Tremendous Progress on study of FTA between China and the Republic of Korea has been made since 2004. Electronic products receive a large share in the foreign trade between China and the Republic of Korea, and they have experienced severe competition mainly due to strong competitiveness and mutual complementarity in their trade. This study is primarily to concern with the forecast of trade creation effects of electronic products of both countries in case of tariff exemption by utilizing a computable general equilibrium (CGE) model, which is a useful methodology of empirical analysis. In light of current trade relationship between two countries, the study also proposes policy recommendation of the Chinese electronic industry for the FTA conclusion between two countries in the future.

북한의 경제 변화와 북한 핵실험이 북·중경제 관계에 미친 영향

張慧智 동국대학교 북한학연구소 2006 북한학연구 Vol.2 No.2

2002년 7월1일 북한의 “경제관리개선조치”를 실행한 이후 북한경제에 비교적 큰 변화가 나타났다. 대내적으로는 경제 각 부문에서 경제적 실리를 중시하는 효율적인 원칙을 실시하고, 노동자의 생산성을 제고했다. 중국의 북한에 대한 무상원조, 무역 및 투자는 북한경제발전의 동력을 제공하고 있다. 중국 개혁·개방모델의 성공은 북한에게 귀감을 제공하고 있다. 중국·북한·한국 3국의 지역협력은 곧 동북아 전력을 진흥시키는데 이익이 되고, 한국의 북·중 경제협력에 대한 우려와 경쟁심을 없애줄 수 있으며 더욱이 북한 경제개방을 촉진하고, 북한의 체제안전에 대한 우려를 약화시킬 수 있을 뿐만 아니라, 점진적으로 북한을 동북아 지역 경제 협력으로 유도할 수 있다. 북한 핵실험은 북·중 양국관계를 심각하게 악화시켰다. 중국이 비록 유엔 결의안에 근거하여 북한에 대한 제재를 실시한다고 해도 북한에 대한 인도주의적 지원을 중단할 수는 없다. 그러나 중국 민간기업의 북한에 대한 무역은 투기와 도박의 성격이 있으므로 단기적으로 민간무역거래가 영향을 받을 수는 있다. 그럼에도 불구하고 중국과 북한의 무역관계는 변함없이 발전적 방향으로 유지될 것이다. This study intends to examines the North Korea-China's economic relationships after North Korean nuclear issue, and explaining characters and contents through the considerations for the economic reform, that is the adoption of economic reform on July 1, 2002 in North Korea. The relationship of between North Korea and China is being changed from the past ideological blood pledge. Both countries are seeking for the strategy and practical relationship.

Economic construction management of composite beam using the head stud shear connector with encased cold-formed steel built-up fix beam via efficient computer simulation

Yin, Jinzhao,Tong, Huizhi,Gholizadeh, Morteza,Zandi, Yousef,Selmi, Abdellatif,Roco-Videla, Angel,Issakhov, Alibek Techno-Press 2021 Advances in concrete construction Vol.11 No.5

With regard to economic efficiency, composite fix beams are widely used to pass longitudinal shear forces across the interface. The current knowledge of the composite beam load-slip activity and shear capability are restricted to data from measurements of push-off. Modelling and analysis of the composite beams based on Euro-code 4 regarding to shear, bending, and deflection under differing loads were carried out using Finite Element through an efficient computer simulation and the final loading and sections capacity based on the failure modes was analysed. In bending, the section potential was increased by an improvement of the strength in both steel and concrete, but the flexural and compressive resistance growth is very weak (3.2% 3.1% and 3.0%), while the strength of the concrete has increased respectively from 25 N/mm² to 30, 35, and 40 N/mm² compared to the increment of steel strength by 27% and 21% when it was raised from 275 to 355 and 460 N/mm², respectively. It was found that the final flexural load capacity of fix beams was declined with increase in the fix beam span for both three steel strength. The shear capacity of sections was remained unchanged at constant steel strength and different length, but raised with final yield strength increment of steel sections by 29%, and 67% when it was raised from 275 N/mm² to 355 N/mm² and 460 N/mm², respectively.

On Alleviation of New User Problem in Collaborative Filtering using SNA Theory

Yang Yujie,Zhang Huizhi,Wang Xianfang 보안공학연구지원센터(IJUNESST) 2013 International Journal of u- and e- Service, Scienc Vol.6 No.6

Experimental Study on Spray Characteristics of The Internal Impinging Nozzle

( Jiachen Zhai ),( Zongjie Hu ),( Wei Xie ),( Huizhi Chen ),( Cong Xue ),( Yufeng Wang ),( Zhijun Wu ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-

The internal impinging nozzle with a bluff body set inside can form a periodic oscillating spray, which is a novel approach of atomization. In this paper, the flow distribution characteristics of the spray are studied with low-pressure water as the medium. Meanwhile, the characteristics of spray cone angle, oscillating frequency, spatial distribution of droplet velocity and particle size are also studied with high-speed Schllieren technique and Malwen particle size analyzer. The results demonstrate that with the increase of the injection pressure, the spray cone angle is almost constant, while the spray oscillating frequency increases gradually, which is tantamount to the variation trend of axial velocity and radial velocity of the droplet. When the injection pressure is elevated from 0.16MPa to 0.18MPa, at the same position, the increase of droplet axial velocity distinctly reaches a maximum. Furthermore, with the development of the spray, the particle size decreases accordingly, and the velocity of the well atomized area near the spray symmetrical center axis is also gradually reduced. The farther away from the nozzle outlet, the more pronounced the symmetry of the spatial distribution of the axial velocity and radial velocity becomes. Moreover, when the injection pressure reaches 0.16MPa, at the position 250mm away from the outlet, the particle size achieves a minimum, and the spray obtains a stable distribution, which is rarefied and uniform in the middle area, while generous on both sides. With the injection pressure increasing to 0.18MPa, the flow of the well atomized area near the spray symmetrical center axis reaches its maximum, and that of the area farthest away from the symmetry center is also raised by degrees as the injection pressure increases.