POSTERS / PW-058 : FUNCTIONAL INTERACTION OF HUMAN GLUTAMINYL - tRNA SYNTHASE AND PRO - APOPTOTIC MEDIATOR , Daxx

(Kun Feng Lil),(Young Gyu Ko),(Tong Shin Chang),(Hee Sae Park),(Eui Joo Choi),(Sung Hoon Kim) 한국생화학분자생물학회 (구 한국생화학회) 1999 6th IUBMB SEOUL CONFERENCE Vol.- No.-

Study on mechanical behaviors of large diameter shield tunnel during assembling

Feng, Kun,Peng, Zuzhao,Wang, Chuang,He, Chuan,Wang, Qianshen,Wang, Wei,Cao, Songyu,Wang, Shimin,Zhang, Haihua Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.21 No.5

In order to study the mechanical behavior of shield tunnel segments during assembly stage, the in-situ tests and FDM numerical simulation were conducted based on the Foguan Shiziyang Tunnel with large cross-section. Analysis for the load state of the assembling segments in different assembly steps as well as the investigation for the changing of inner forces and longitudinal stress of segments with assembling steps were carried out in this paper. By comparing the tested results with the simulated results, the conclusions and suggestions could be drawn as follows: (1) It is the most significant for the effects on axial force and bending moment caused by the assembly of adjacent segment, followed by the insertion of key segment while the effects in the other assembly steps are relative smaller. With the increasing value of axial force, the negative bending moment turns into positive and remains increasing in most monitored sections, while the bending moment of segment B1and B6 are negative and keeping increasing; (2) The closer the monitored section to the adjacent segments or the key segment, the more significant the internal forces response, and the monitored effects of key segment insertion are more obvious than that of calculation; (3) The axial forces are all in compression during assembling and the monitored values are about 1.5~1.75 times larger than the calculated values, and the monitored values of bending moment are about 2 times the numerical calculation. The bending moment is more sensitive to the segments assembly process compared with axial force, and it will result in the large bending moment of segments during assembling when the construction parameters are not suitable or the assembly error is too large. However, the internal forces in assembly stage are less than those in normal service stage; (4) The distribution of longitudinal stress has strong influence on the changing of the internal forces. The segment side surface and intrados in the middle of two adjacent jacks are the crack-sensitive positions in the early assembly stage, and subsequently segment corners far away from the jacks become the crack-sensitive parts either.

Variation of Urinary and Serum Trace Elements (Ca, Zn, Cu, Se) in Bladder Carcinoma in China

Guo, Kun-Feng,Zhang, Zhe,Wang, Jun-Yong,Gao, Sheng-Lin,Liu, Jiao,Zhan, Bo,Chen, Zhi-Peng,Kong, Chui-Ze Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.5

Backgrounds: Deficiency or excess of trace elements can induce body metabolic disorders and cellular growth disturbance, even mutation and cancerization. Since there are few studies of the effect of trace elements in bladder carcinoma in China, the aim of this study was thus to assess variation using a case control approach. Methods: To determine this, 81 patients with bladder carcinoma chosen as a study group and 130 healthy persons chosen as a control group were all assayed for urinary and serum trace elements (calcium [Ca], zinc [Zn], copper [Cu], selenium [Se]) using an atomic absorption spectrophotometer, and the results were analyzed by independent sample t tests. The correlative factors on questionnaires answered by all persons were analyzed by logistic regression. Results: The results showed urinary Ca, Zn and serum Cu levels of the study group to be significantly higher (P<0.05) than those of he control group. Serum Ca and Se levels of study group were significantly lower (P<0.05) than those of control group. Conclusion: There were higher urinary Zn and serum Cu concentrations in bladder carcinoma cases. Bladder carcinoma may be associated with Ca metabolic disorder, leading to higher urinary Ca and lower serum Ca. Low serum Se and smoking appear to be other risk factors for bladder carcinoma in China.

중국의 금융사이클과 실물사이클 간 관계 분석

풍곤 ( Feng Kun ),이기성 ( Ki Seong Lee ) 아시아.유럽미래학회 2021 유라시아연구 Vol.18 No.3

2008년 글로벌 금융위기는 금융부문에 의해 확대 재생산되면서 대내외 거시경제 변수에 매우 큰 영향을 미쳤다. 글로벌 금융위기 이전에는 주로 실물사이클 분석을 통해 전반적인 한 국가의 경기 상황을 진단해 왔다. 그러나 글로벌 금융위기를 경험하면서 금융부문과 실물부문은 각각의 동인(driver)을 가지고 있으며 별도의 거시경제순환으로 이해할 필요가 있다는 주장이 대두되었다. 특히 금융사이클(financial cycle)은 글로벌 금융위기 이후 현대 거시경제학의 새로운 연구 방향으로 진행되고 있다. 금융사이클이란 금융변수들의 종합적인 순환변동을 의미한다. 금융사이클은 금융자산의 속성상 가격이 상승할 때 오히려 수요가 증가하고, 호경기 때 상당기간 동안 낙관론이 지속하는 경제주체들의 제한적 합리성과 이에 따른 위험추구 성향, 금융제약(financial constraints)으로 대출이 담보가치에 의존하는 등 상호작용을 하게 된다. 따라서 신용(credit)과 자산가격 간 자기실현적 상호작용(self-fulfilling interaction)이 금융사이클의 핵심요인이라 할 수 있으며, 상당기간 동안 실물부문과 금융부문 간 불균형이 지속되는 경우 외부충격과 혼재하여 금융위기가 초래되는 경향이 있다. 특히, 국제결제은행(BIS)의 주요 연구자들은 1990년대 대완화기(Great Moderation)부터 실물경제의 순환과 구별되는 금융사이클 개념을 통하여 실물경제의 안정과 금융안정이라는 두 가지 과제의 관련성을 연구하고 있다. 이들은 실물경제의 변동이 금융부문의 역할에 의해 더욱 확장되거나 수축되는 현상에 주목함으로써 단순히 실물경제에 대한 금융부문의 영향을 다루는 것에 국한하지 않고, 각각 독자적인 내생적 동인과 순환주기를 갖는 실물사이클과 금융사이클을 구별해야 한다고 주장하였다. 문제는 두 가지 사이클이 항상 동조화되는 것은 아니라는 점이다. 실물사이클의 수축기에 금융사이클은 확장기일 수 있으며, 그 반대의 경우도 가능하다. 따라서 실물경제, 즉 물가안정을 목표로 하는 통화정책과 금융안정을 목표로 하는 거시건전성정책은 괴리될 수가 있고, 각각의 국면에 따라서 통화정책과 거시건전성정책을 적절하게 조합하는 것이 중요한 과제가 될 수 있다. 이에 본 연구는 중국의 금융사이클과 실물사이클을 측정하기 위하여 2001년 1분기부터 2020년 3분기까지 분기별 자료를 이용하여 금융사이클과 실물사이클 간의 관계를 분석하였다. 분석 결과를 정리하면 다음과 같다. 첫째, 총신용과 민간신용/GDP보다 주택가격 사이클 및 주식가격 사이클의 순환주기는 상대적으로 짧게 나타나고 있다. 둘째, 사이클 측정을 위하여 선택한 지표들은 대체로 중기 사이클을 잘 반영하고 있는 것으로 나타났다. 셋째, 금융사이클의 경우 최근 정점을 향해 가는 모습을 보여 금융위기 시 나타나는 전조현상일지도 모른다는 우려가 있다. 넷째, 2008년 글로벌 금융위기 이전까지는 금융사이클과 실물사이클이 동조성을 보였지만 최근 들어 금융사이클과 실물사이클은 상반되게 엇갈리는 모습을 보이고 있다. 본 연구의 분석 결과를 바탕으로 시사점을 도출하면 다음과 같다. 첫째, 금융사이클은 경기순환 국면에 따라 신용이 확장과 수축을 반복하면서 불가피하게 나타나는 현상이지만 금융사이클이 과도하게 증폭하는 경우 신용과 자산가격의 붐-버스트(boom-bust) 현상이 발생하게 된다. 그러므로 금융사이클의 변동폭을 완화하기 위해서는 지나치게 낮은 저금리 기조를 탈피하고, 대칭적이고 일관성 있는 정책을 통하여 안정적인 거시경제 상황을 조성하는 것이 필요하다. 둘째, 금융사이클의 순환과정에서 자산가격의 버블이 과도하게 확대되지 않도록 자산가격의 동향을 철저하게 모니터링하는 것이 매우 중요하다. 셋째, 정보통신기술의 발달과 더불어 새로운 금융기법의 발달로 인해 금융구조의 변화가 불가피하지만, 금융시스템 전반의 경기순응성이 크게 높아지면서 금융사이클의 지속기간 및 강도가 크게 증폭되고 있다. 따라서 정책당국은 금융시스템의 경기순응성을 완화하기 위한 여러 가지 방안을 강구해 나가야 할 것이다. The data used in this research are from the first quarter of 2001 to the third quarter of 2020 to analyze the relationship between the financial cycle and the business cycle in China. The research results are as follows: First, the cycling period of housing price cycles and equity price cycles are relatively short in comparison with the ratios of total credit to the private credit to GDP. Second, the research shows that the selected indicators faithfully manifest the medium-term cycle. Third, in terms of the financial cycle, because of the peak, there is concern that this could lead to a financial crisis. Fourth, the financial cycle and business cycle were synchronized before the global financial crisis of 2008. However recently they are at odds. The monetary policy and financial stability have always been the main research questions of researchers. Because of the several financial crises, their importance has become more prominent. In addition, since the Great Moderation, leading researchers at the Bank for International Settlements (BIS) have studied the relationship between the stability of the real economy and financial stability with the concepts of financial cycle and business cycle. They pay attention to the expansion and contraction of the real economy caused by the financial sector. For the real economy, it not only needs to deal with the impact of the financial sector, but to distinguish the internal factors of the business cycle and the financial cycle. The point is that the two cycles are not always in sync. In the contraction period of the business cycle, the financial cycle can be in the expansion period, and vice versa. Thus, monetary policy aimed at price stability is often at odds with macroprudential policy aimed at financial security. It is an important task to properly integrate monetary policy and macroprudential policy according to different conditions. According to the research results, the enlightenment is obtained as follows: First, the financial cycle is inevitable, and it refers to the expansion and contraction of credit according to the certain period of the economic cycle. If the financial cycle is excessively amplified, the credit and asset prices will have boom-bust. Therefore, in order to mitigate the fluctuation of the financial cycle, it is necessary to create a sound macroeconomic environment by shaking off excessively low interest rates and implementing targeted policies. Second, in the financial cycle, it is very important to monitor the asset price development so as to avoid excessive asset prices bubble. Third, as the information and financial technology developing rapidly, although the changes of financial structure are inevitable, the procyclicality of the financial system has greatly increased, and the duration and intensity of the financial cycle have also greatly increased. Therefore, the country should begin to find measures to decrease the procyclicality of financial cycle.

Fluorine-Substituted Dithienylbenzodiimide-Based n-Type Polymer Semiconductors for Organic Thin-Film Transistors

Feng, Kui,Zhang, Xianhe,Wu, Ziang,Shi, Yongqiang,Su, Mengyao,Yang, Kun,Wang, Yang,Sun, Huiliang,Min, Jie,Zhang, Yujie,Cheng, Xing,Woo, Han Young,Guo, Xugang American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.39

<P>Imide functionalization is one of the most effective approaches to develop electron-deficient building blocks for constructing n-type organic semiconductors. Driven by the attractive properties of imide-functionalized dithienylbenzodiimide (TBDI) and the promising device performance of TBDI-based polymers, a novel acceptor with increased electron affinity, fluorinated dithienylbenzodiimide (TFBDI), was designed with the hydrogen replaced by fluorine on the benzene core, and the synthetic challenges associated with this highly electron-deficient fluorinated imide building block are successfully overcome. TFBDI showed suppressed frontier molecular orbital energy levels as compared with TBDI. Copolymerizing this new electron-withdrawing TBDI with various donor co-units afforded a series of n-type polymer semiconductors TFBDI-T, TFBDI-Se, and TFBDI-BSe. All these TFBDI-based polymers exhibited a lower-lying lowest unoccupied molecular orbital (LUMO) energy level than the polymer analogue without fluorine. When applied in organic thin-film transistors, three polymers showed unipolar electron transport with large on-current/off-current ratios (<I>I</I><SUB>on</SUB>/<I>I</I><SUB>off</SUB>) of 10<SUP>5</SUP>-10<SUP>7</SUP>. Among them, the selenophene-based polymer TFBDI-Se with the deepest-positioned LUMO and optimal chain stacking exhibited the highest electron mobility of 0.30 cm<SUP>2</SUP> V<SUP>-1</SUP> s<SUP>-1</SUP>. This result demonstrates that the new TFBDI is a highly attractive electron-deficient unit for enabling n-type polymer semiconductors, and the fluorination of imide-functionalized arenes offers an effective approach to develop more electron-deficient building blocks in organic electronics.</P> [FIG OMISSION]</BR>

The Influence of Changing PV Array Interconnections under a Non-uniform Irradiance

Kun Ding,Li Feng,Si-Yu Qin,Jing Mao,Jing-Wei Zhang,Xiang Wang,Tao Peng,Quan-Xin Zhai 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2

Usually, the output characteristics of a photovoltaic (PV) array are significantly affected by non-uniform irradiance which is caused by ambient obstacles, clouds, orientations, tilts, etc. Some local maximum power points (LMPP) in the current-voltage (I-V) curves of a PV array can result in power losses of the array. However, the output power at the global maximum power point (GMPP) is different in different interconnection schemes in a PV array. Therefore, based on the theoretical analysis and mathematical derivation of different topological structures of a PV array, this paper investigated the output characteristics of dual series PV arrays with different interconnections. The proposed mathematical models were also validated by experimental results. Finally, this paper also concluded that in terms of performance, the total cross tied (TCT) interconnection was not always the optimal structure, especially in a dual series PV array. When one of the PV modules was severely mismatched, the TCT worked worse than the series parallel (SP) structure. This research can provide guidance for switching the interconnection to gain the greatest energy yield in a changeable- structure PV system.

Effect of Potassium on Flavor Quality and LOX Activity of Cucumber in Solar-Greenhouse

Feng-ting Wang,Jin-liang Liu,Kun-fan Xu,Xi-zhen Ai 한국원예학회 2006 한국원예학회 기타간행물 Vol.- No.-

Three-Dimensional Tolerance Analysis Modelling of Variation Propagation in Multi-stage Machining Processes for General Shape Workpieces

Kun Wang,Shi-Chang Du,Li-feng Xi 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.1

The quality control of general shape workpieces has become one of research hotspots because of the increasing diversity of products. The theory of stream of variation (SoV) for machining processes is a successful method in researching variation propagation rule. However, with the consideration of all key elements in manufacturing system, there is no unified and integrated model for workpieces in different kinds of shapes. In this paper, a new variation propagation model in multi-stage machining processes for general shape workpieces is established. It visually demonstrates the variation propagation chain and expands the universality of current SoV models. The connection of all key elements in manufacturing system is defined as an assembly chain, in which the variations are defined and propagated by modified three-dimensional tolerance analysis method. The equivalent conversion of the connection between workpiece and fixture realizes the modelling of general shape workpiece regardless of its machining method and locating scheme. Real experiments validate the effectiveness and accuracy of the new SoV model for different shape workpieces. This model has great potential to be applied toward multi-scale variation modelling, process control, and fault diagnosis for general shape workpieces.

Decoding Tropospheric Ozone in Hangzhou, China: from Precursors to Sources

Feng Rui,Luo Kun,Fan Jian-ren 한국기상학회 2020 Asia-Pacific Journal of Atmospheric Sciences Vol.56 No.3

For the purpose of providing a tropospheric O3 control strategy for Hangzhou, China, we investigate the influential factors of it using observed data and the WRF-CMAQ model. The result indicates that temperature and relative humidity are the dominant factors and Hangzhou belongs to VOC-limited regime. Long-range/regional transport accounts for 15.4% and 17.4% of O3 in autumn and winter, respectively, showing a north-to-south transport pattern while 14.5% and 19.7% of O3 in spring and summer, respectively, showing a southwest-to-northeast transport pattern. Annual contribution of local industry to local O3 was 59.2%, followed by residence, traffic and agriculture. Ethylene, m/p-xylene, toluene and propylene are the main O3 producers. Therefore, controlling VOCs species that possess the highest ozone formation potentials, afforestation, implementing artificial precipitation and shutdown local industry are the most effective ways to mitigate ozone pollution in Hangzhou.

Oil film deposition characteristics and judgment of lubrication effect of splash lubricated gears

Feng-xia Lu,Kun Wei,Meng Wang,Mou Li,He-yun Bao 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.5

To study the oil film deposition characteristics of splash lubricated gears and determine whether their meshing area is completely lubricated, this study proposes the concept of judging the splash lubrication-deposition characteristics-inlet oil film thickness-lubrication effect. The critical oil film thickness that characterizes the full lubrication of the gear meshing area was obtained as 14.5428 μm by using elastohydrodynamic lubrication (EHL) theory. Based on computational fluid dynamics (CFD) method, based on the renormalization group (RNG) k-ɛ two-equation turbulence model, dynamic mesh model and volume of fluid (VOF) model, the numerical calculation of the intermediate gearbox in splash lubrication is carried out. The oil film deposition thickness of the gear tooth that was about to enter the meshing area was calculated to be 95.6207 μm. It was found that the meshing area is fully lubricated under the rated operating conditions.