High Construction Costs Research Articles

Seasonal patterns of leaf physiological traits, nutrient and adaptive strategies of co-occurring Alnus nepalensis and Quercus leucotrichophora tree species in the central Himalaya

We compared seasonal leaf gas exchange patterns, photosynthetic pigments, and photosynthetic nutrient use efficiencies in two co-occurring tree species, Nepalese alder (Alnus nepalensis D. Don) and white oak (Quercus leucotrichophora A. Camus), in the central Himalaya. In both species, area-based and mass-based photosynthetic CO2 assimilation rates, stomatal conductance, leaf nutrient concentration, photosynthetic nutrient use efficiency, and leaf chlorophyll pigments peaked in summer, while water use efficiency peaked in autumn. In spring, summer, and autumn, values for most parameters (specific leaf area, relative water contents, area-based and mass-based photosynthetic CO2 assimilation rates, leaf nutrient concentration, photosynthetic nutrient use efficiencies, and leaf chlorophyll pigments) were higher in A. nepalensis than in Q. leucotrichophora. In winter, however, values for area-based CO2 assimilation rates, water use efficiency, leaf calcium, leaf magnesium concentration, and photosynthetic pigments were higher in Q. leucotrichophora than in A. nepalensis. We conclude that A. nepalensis exhibits a more resource-acquisitive strategy, characterized by higher levels of leaf nutrients and nutrient use efficiencies, that supports higher photosynthetic capacity. In contrast, Q. leucotrichophora exhibits a resource-conservative strategy with higher construction cost.

An Extensive Analysis of the Engineering Design of Underground Sewage Plants in China

In recent years, underground sewage treatment plants that can remarkably reduce land occupation with less environmental pollution are gradually entering the popular consciousness and are now being used widely. However, problems associated with the traditional treatment plants, such as high construction and operation cost, severe health and safety risks, and monotonous landscape design have limited their value and restricted their application and promotion. Through the literature and field investigations, the value of underground sewage treatment plants (STPs) was analyzed, their engineering and landscape design were studied, and their development direction was explored in order to supply a theoretical basis for further application and development of underground STPs. The analysis showed that as a new model of environmentally friendly sewage treatment and resource conservation, underground STPs have the apparent advantages of lower cost of land use for construction and pipeline as well as an outstanding value for the urban landscape and ecological environment. These factors can offset its relatively high construction and operating costs to a certain extent, especially when compared with above-ground STPs. The engineering design study results showed that significant differences existed between underground STPs and traditional above-ground STPs, and that the main contents of the engineering design of underground STPs consist of treatment scale and degree, influent and effluent qualities, site selection, design model, underground arrangement and structure, main treatment process, monomer structure, ventilation and deodorization, daylighting and artificial lightings, fire safety, operation and maintenance, and the linkage design between the above-ground landscape and the underground STP.

Filter-Hilbert method for automatic correction of non-anechoic antenna measurements with embedded self-calibration mechanism

One of the most important steps in the process of antenna development involves measurements of its prototype. Far-field performance of radiators is normally characterized in strictly controlled environments such as anechoic chambers which can ensure certification-grade accuracy. Unfortunately, they are also characterized by high construction costs which might not be justified for low-budget research and/or teaching-related activities. Alternatively, the radiation characteristics can be obtained in non-anechoic test sites which neglect the expensive components such as shielding and/or absorbing materials. Although the noise from external radiation sources and multi-path interferences renders direct measurements in such conditions useless for drawing conclusions on antenna performance, the quality of responses can be substantially increased using appropriate post-processing. Unfortunately, the existing techniques are difficult to set-up and prone to failure which makes them of limited use for day-to-day measurements. In this work, a correction framework for non-anechoic measurements based on a set of Hilbert filters automatically adapted to propagation conditions within the test-site has been proposed. The presented method has been validated based on three example antennas and a total of 25 experiments covering 15 unique frequencies of interest. A benchmark of the method against the state-of-the-art correction techniques has also been performed.

Study on Function and Appearance Design of Smart Street Lamps Based on Kansei Engineering: A Literature Review

The potential of smart cities to alleviate the challenges of urban development in relation to population, resources, and environment is widely recognized, making it a key urban development trend for the future. Smart street lamps (SSLs) are a crucial component of smart city infrastructure. However, their current unreasonable function settings and appearance design do not meet the emotional needs of residents and come at a high construction cost, resulting in decreased user satisfaction. Based on WOS and CNKI databases, 39 literatures on the aspects of theory, steps and technologies of KE, 32 literatures on the development, basic functions, construction, existing problems, and key technologies of SSLs, and 6 papers on street lamps functions or appearance design research based on KE be reviewed in this paper. Therefore, the application of KE method in SSL design be extensively reviewed, with emphasis on the future development direction of KE, the design principles of SSLs, and the implementation of KE in SSL design. This review aims to summarize the research gaps, future research directions, and future development trends of KE and SSL. Ultimately, the review concludes that the integration of KE in SSL design research is crucial to improve SSL products’ rationality, openness, and amicability, guided by scientific SSL design principles.

Evaluating construction parameters of HB and CD methods for super large section tunnel: a case study

The double sidewall guide pit and centre cross diagram (CRD) methods are often used for the construction of large-section tunnels through water-rich fault fracture zones due to their long construction time and high construction cost. To shorten the construction period and save costs, the top heading and benching method (HB) and centre diaphragm (CD) can be chosen for construction. The construction parameters of the step and CD methods are optimized to ensure the surrounding rock stability and tunnel safety. By relying on the Tongzi Tunnel, we simulate the excavation of different step heights in the construction of the top heading and benching method (HB) and CD methods through numerical simulation, the laws of tunnel vault settlement, and changes in the surrounding rock stress, initial support axial force, bending moment and safety factor. The study shows that as the height of the upper step increases, the settlement of the vault and the convergence of the periphery increase, the initial support safety factor decreases, and the plastic zone of the surrounding rock increases at 30 m from the target face. The step height for the top heading and benching method (HB) of construction is optimized as follows. The ratios of the upper, middle and lower step heights are 0.45H, 0.35H and 0.2H, respectively. The CD method construction step height is optimized to the left (right) upper and left (right) lower step height ratios of 0.5H and 0.5H, respectively.

Improvement of Socio-Economic Activities at the Island of Semau based on Sustainable Road and Bridge Management Strategy

A stable functional condition of roads is a guarantee of smooth, safe and comfortable socio-economic travel in an area. However, there is a limited ability to provide and/or manage development funds to preserve the road and bridge infrastructure. So far, every year the government tries to update the data base based on the result of road and bridge functional condition survey, intended to determine their priority handling. Result of field observation shows that the condition of some road links was in a poor level category so that it may affect the accessibility and mobility around the island of Semau, especially on the main connecting road to the location of main tourism objects. In addition, the type of land use and/or the availability of various supporting tourism facilities is very limited. These might influence the tourism area's attractiveness and/or the trip attractiveness due to the required time travel as well as travel cost. The limited or unavailability of local pavement material make it worst (high construction and/or preservation costs). Accordingly, the aim of this study is 1) to identify the determinant variables behind such transportation system problems, particularly based on the current physical and functional connectivity of roads and bridges, including variables that influencing the institutional capability arrangement 2) to recommend the appropriate strategy in road and bridge preservation and land use utilization. Keywords: Physical and functional connectivity; Surface distress index; Socio-economic trip; Sustainable management strategy; Transportation system management

Capacity Allocation Optimization of Wind-Solar-Hydrogen-Storage Coupled Power Generation System Based on a Double-layer Model

Grid-integrated wind-solar and hydrogen storage coupling power generation systems face problems such as high costs of investment, construction, operation, and maintenance. After the conformity of renewable energy, the system’s dependability decreases, and the comprehensive power fluctuation influences the power grid greatly. To solve the above problems, this paper proposes a two-tier model. With the system economy, reliability, and wind-solar comprehensive power fluctuation suppression as optimization objectives, the capacity distribution of the hydrogen storage devices can be optimized. Based on a practical microgrid example, the inner and outer layers adopt Sparrow Search Algorithm (SSA) and Multi-objective Optimization Particle Swarm Optimization Algorithm (MOPSO), respectively, to solve the established model. The optimization results are compared according to three scenarios. The results demonstrate that this model can enhance the operational reliability of the system while considering the overall economy of the system and effectively suppressing the fluctuation of solar and wind power.

IS SUSTAINABILITY COSTLY? EMPIRICAL EVIDENCE FROM BUILT PROJECTS

ABSTRACT The affordability of sustainable building remains a significant challenge; developers, building owners, and design teams often point to high construction costs as the primary obstacle hindering the uptake of sustainable building. Because of a lack of clarity, empirical studies and evidence supporting the claim of sustainable building as expensive are inadequate, thus the perceived high cost of sustainable building is still debatable. This study has a three-pronged approach: (1) to collect actual construction costs of certified sustainable buildings, (2) to take a deep dive into construction cost using empirical data and analyze the correlation between the level of sustainability and the construction cost, and (3) to examine the influence of cost components on the total construction cost. Data from 72 LEED buildings was collected and included in the analysis. The findings show the following: (a) the construction costs of the studied sustainable buildings are comparable to those of conventional buildings (even lower); (b) the correlation between the level of sustainability and the construction cost is inconclusive; and (c) soft costs, especially the design cost, have a similar level of influence on the total construction cost as those of hard costs.

Modification of Misfit-Layered Cathode Materials for Improving Electrocatalyic Activity in Reversible Protonic Ceramic Cells

The demand for sustainable regeneration energies such as solar and wind has been continuously increasing by the rise of environmental issues. However, several major technical issues such as intermittent electricity production and high system construction cost are major obstacles to large-scale commercialization for regeneration energies [1]. Reversible protonic ceramic cells (RPCCs) can be an alternative choice because of their high efficiency, long-term durability at intermediate temperatures, and bifunctionality for producing both hydrogen and electricity in an electrochemical device [2]. Until now, perovskite-structured cathode (air/steam electrode) materials have been in spotlight due to their fast oxygen reaction kinetics in RPCCs [3]. However, in spite of their high electrocatalytic activity for oxygen electrode reactions (oxygen evolution and reduction), low phase stability in humid atmospheres, thermal expansion mismatch to common proton electrolytes, and relatively low proton conductivity of RPCCs are still major obstacles to enter the era of hydrogen economy [4, 5]. Hence, we demonstrate novel misfit-layered structure Ca3Co4O9+δ (CCO)-based materials to overcome these technical issues with superior catalytic activity for high performance RPCCs. The thermal expansion coefficient value of CCO is 10-12×10−6 K−1, which is relatively similar to that of the BaCeO3-based proton electrolytes, implying that the CCO-based materials are thermo-mechanically stable during cell operations [6]. In addition, the needle-like morphology of the CCO-based materials is quite valuable in the supply of steam (or air) to the catalytic active sites and elimination the water produced by the electrochemical reaction. Furthermore, with the doping of alkali metal ion (Li, Na, and K) into Ca-site, CCO generates extra charge carrier species with the modified Co oxidation state. This triggers the proton uptake and diffusion properties of CCO-based materials with the improved electrical conductivity. As a result, 5 mol% Na-doped CCO-cell shows exceptionally high performance in both protonic ceramic fuel cell and electrolysis cell modes for RPCCs.

Influences of seasonal changes of the ground temperature on the performance of ground heat exchangers embedded in diaphragm walls: A cold climate case from North China

Compared with ground heat exchangers (GHEs) in typical vertical boreholes with depth of 100–120 m, GHEs embedded in the diaphragm wall of buildings are more easily affected by periodic changes of the shallow ground temperature. Here we numerically solve the heat transfer model of the diaphragm wall with GHEs considering actual ground temperature boundary conditions in cold climate region, North China, and investigate the influences of seasonal variations of the ground temperature on heat transfer performance of GHEs. Results show that due to the above seasonal effect, the heat exchange performance of GHEs may decrease to different extent especially in relatively shallow diaphragm walls, thereby causing non-negligible design deviations. Under the present geometric and climate conditions, as the depth of GHEs increases, the maximum thermal influence distance from the diaphragm wall tends to increase during the cooling season and decrease during the heating season, respectively. The optimal spacing between GHE groups ranges from 0.5 to 0.9 m, and though a high construction cost, a smaller spacing is more favorable for improving the overall energy efficiency. The present work is expected to provide useful references for optimal design and performance prediction of GHEs embedded in diaphragm walls with similar climate conditions.

Investigation on preparation and properties of carbon fiber graphite tailings conductive asphalt mixture: A new approach of graphite tailings application

The massive accumulation of graphite tailings (GT) brings huge pressure to environmental engineers. Meanwhile, the conductive asphalt pavement industry is suffering from the high construction cost and the complex acquisition of conductive materials. The application of GT in asphalt mixture as a conductive material may be a win–win solution for the above concerns. This study aims to evaluate the feasibility of preparing carbon fiber graphite tailings (CF-GT) conductive asphalt mixture. The optimum preparation technology and material ratio were explored. The service performance tests of the conductive asphalt mixture were conducted, including conductive characteristics, electrothermal performance and pavement performance. Based on the experimental results, 0.3% (mass fraction) 6 mm-polyacrylonitrile (PAN)-based carbon fiber (CF) and 12% (mass fraction) GT were selected as conductive materials to prepare conductive asphalt mixture with resistivity of 5.75 Ω∙m. The addition of GT reduced the resistance by a maximum of 59.8%. The temperature-sensitive and pressure-sensitive characteristics of the mixture have staged characteristics. Moreover, the resistance and stress of the mixture have an excellent linear correlation in the positive pressure coefficient (PPC) effect stage and negative pressure coefficient (NPC) effect stage respectively, especially NPC. Conductive asphalt mixture has a good heating effect after being powered on. GT combined with CF enhanced the high-&low-temperature performance but deteriorated the moisture damage resistance performance of the asphalt mixture. The feasibility of CF-GT conductive asphalt mixture was demonstrated.

Growth of aridity and development of integrated land reclamation in the Republic of Tatarstan

Subject. The article addresses problems of organization of efficient and stable agricultural production in conditions of climate aridity in the Volga region. Objectives. The aim is to review the current state of the land reclamation industry in the Republic of Tatarstan, to elaborate recommendations for its further development. Methods. The study employs methods of comparison, systematization, and generalization of data. Results. We investigated the dynamics of agrometeorological data for 2006–2020 in the Republic of Tatarstan and revealed a trend towards an increase in climate aridity in the Volga region. The assessment of economic efficiency of irrigated agriculture enabled to state that potato yield increases by four times due to irrigation. Watering perennial crops helps provide the livestock industry with a reliable feed base. Conclusions. Despite the high economic efficiency of agricultural land reclamation, the number of agricultural producers introducing it into production activities remains low due to the high cost of restoration, construction and operation of land reclamation facilities, scarce technical and financial resources at agricultural enterprises.

Physical model driven fault diagnosis method for shield Machine hydraulic system

The hydraulic system of shield machine is critical component, and any faults in this system can have severe consequences on construction progress and even pose risks to the safety of construction personnel. However, the high manufacturing and construction costs of shield machines, as well as the use of highly reliable hydraulic components, make it challenging to obtain a large number of fault samples that accurately reflect the actual operating conditions of the hydraulic system. This limitation is one of the major obstacles to the practical application of intelligent fault diagnosis in shield machines. Furthermore, due to the large scale and complex structure of the hydraulic system in shield machines, few scholars have studied the bottleneck that restricts the fault diagnosis of the hydraulic system of the shield machine. To address these challenges, this paper proposes physical model-driven approach for fault diagnosis in shield machine hydraulic systems, aiming to overcome the lack of fault feature information during the fault diagnosis process. Firstly, physical models for various hydraulic components of the shield machine hydraulic system are established, and the relationship between the physical models and fault characteristics is investigated to provide a theoretical basis for fault injection. Then, a physical model correction method based on cosine similarity is proposed. Using recorded high-frequency fault data from shield machine hydraulic systems, fault injection is performed to obtain simulated data that effectively reflects the actual fault states and normal states of the hydraulic system. Finally, using the simulated data as training samples and measured data as test samples, various artificial intelligence diagnosis models, such as Support Vector Machines (SVM), Extreme Learning Machines (ELM), and Convolutional Neural Networks (CNN), are employed for diagnostic classification. The classification results demonstrate the feasibility and effectiveness of the physical model-driven approach for fault diagnosis in shield machine hydraulic systems. Furthermore, this approach exhibits strong universality and scalability, providing a solution for fault diagnosis scenarios with limited or even no fault samples.

Incremental population density improvement via missing middle housing under density-based and form-based zoning ordinances

Purpose The purpose of the study is to observe the feasibility of missing middle housing’s (MMH) realization under density-based zoning, form-based zoning and a combination of both while simultaneously providing affordable housing, improving quality of life and making efficient use of land. Design/methodology/approach This study takes a theorist approach and designs three hypothetical cottage court projects that comply with all relevant official local zoning ordinances to showcase design feasibility, followed by an analytical component in the form of a financial model constructed using official local economic and demographic conditions. Findings MMH, and in particular cottage clusters, can be implemented under rigorous density-based, form-based and hybrid (density-based + form-based) zoning ordinances and provide affordable housing (Atlanta, GA), improve quality of life (Blackpool, UK) and make efficient use of land (Jinan, China). All hypothetical projects are financially feasible under reasonable conditions. Originality/value To the best of the author’s knowledge, this paper is the first in the body of knowledge to discuss how the MMH can be integrated into urban density-based zoning rather than converting density-based zoning into form-based so that the MMH can fit. The paper also takes a cross-national perspective and discusses the feasibility of MMH in the resolution of housing issues in the USA, China and the UK. The study also concludes that the issue of housing unaffordability in the UK was caused by high construction cost relative to median income.

Optimal Management of Seasonal Pumped Hydro Storage System for Peak Shaving

Power demand varies on a daily and seasonal basis. Responding to changing demands over time is challenging for energy suppliers as it causes expensive power plants to operate in high-demand seasons, usually summer, increasing the cost of electricity. Peak load shaving makes the load curve flatten by reducing the peak load and shifting it to times of lower demand, hence reducing the operation of expensive power plants. Hence, there is a need for large-scale and long-term ESS to store energy in the time of low-demand seasons for future utilization in the highest-demand ones. In this work, an energy management system (EMS) is developed to optimally manage a grid-connected pumped hydro storage (PHS) for peak shaving. The proposed model incorporates a dynamic economic dispatch (DED) over a study period of one year; hence, a DC power flow analysis considering transmission constraints is utilized to ensure a fast load flow estimation and a manageable simulation time. The framework can be adopted to assess the long-term profitability of PHS-utilizing GAMS as an optimization tool. Further, to draw conclusions that would suit the characteristics of the demand pattern. This analysis is essential to motivate the construction of new seasonal PHS plants due to the high construction costs they are identified with, especially in geographical areas where this technology is not yet considered or is hard to construct. The simulation results demonstrate that integrating 1500 MWh PHS reduced the operation of expensive thermal units by 1224 MWh annually. Further, a reduction in operation costs was recorded after integrating a PHS unit that ranged from 2.6 M to 22 M USD/year, depending on the storage capacity.

A comprehensive review of incremental launching method in the construction of prestressed reinforced concrete bridges in Vietnam

This paper discusses the implementation of the incremental launching method in the construction of prestressed reinforced concrete bridges in Vietnam. Since the 1990s, technology transfer has been initiated to develop and rapidly expand the country’s road and rail transport network system to support industrialization and modernization. Although the method was successfully applied in several bridge projects, the high construction cost has led to a controversial issue, and the government stopped its application in the country. The paper aims to analyze the limitations and unreasonableness in the project formulation, design survey, and procurement of technological equipment that led to the policy of stopping the application of the incremental launching method. The author provides an in-depth analysis to clarify the suitability of the policy and shed light on the issue’s root causes.

Optimization of floating wind farm power collection system using a novel two-layer hybrid method

Deep-sea floating wind farms have gained significant attention in recent years, however, their high construction and operation cost remains a notable challenge. In the floating wind farm, floating wind turbines (WTs) have a certain range of movement, and dynamic cables are used, thus the collection system needs a careful design that relies heavily on iterative optimization. In this study, a life cycle cost model for the collection system of floating wind farms is firstly established considering the floating characteristics. Due to the complexity of the optimization model, the two-layer optimization framework is presented. The upper layer uses Binary Particle Swarm Optimization (BPSO) to determine the optimal connection between the WTs and offshore substations (OSs), while the lower layer optimizes the cable topology between WTs via Improved Monte Carlo Tree Search (IMCTS). Simultaneously, the cable selection scheme corresponding to the obtained topology is optimized by the lower level. Simulations are performed to validate the proposed method. The results demonstrate that the proposed algorithm achieves a minimum optimization cost of 45.277 million euros, and attains significant reductions of 2.31, 0.486 and 1.667 million euros, respectively, compared to Genetic Algorithm (GA), BPSO-Sweep-IMCTS and BPSO-AA-GA. Further, this study evaluates the differences in the optimized structures of the collection system between floating and fixed wind farms, and analyzes the effects of the OS position and environmental factors. The analysis results show that locating OSs at the central position and upstream side reduces the cost of the collection system, and the wind condition has a considerable influence on the design of the collection system.

К ВОПРОСУ РАЗВИТИЯ И ЭКОНОМИЧЕСКОЙ ЭФФЕКТИВНОСТИ МЕЛИОРАТИВНОЙ ОТРАСЛИ РЕСПУБЛИКИ ТАТАРСТАН

Sustainable and efficient production of agricultural products, regardless of the influence of weather and climate factors in the zone of risky farming, is largely possible only with the widespread introduction of land reclamation measures. The research was carried out with the aim of studying the current state of the reclamation industry in the Republic of Tatarstan and developing scientifically based ways of its development. In the course of the studies of the economic efficiency of irrigated agriculture in the republic, it was found that in potatoes production due to irrigation, the yield increases from 3.89 to 4.2 times, and the marketability of finished products due to improved quality and standardization of tubers by 2.58 times. It was revealed that with a potato marketability of 80%, the net income per 1 ha is 495.9 thousand rubles. The net income from 1 ha of corn for silage under irrigation is 52.4 thousand rubles. This suggests that one ruble spent on irrigation allows farms to receive up to 12 rubles of additional production in the production of grain crops. And in the production of vegetables and marketable potatoes - up to 40 rubles. The cultivation of perennial crops on irrigation makes it possible to obtain up to four full-fledged cuttings, which makes it possible to provide the livestock industry with a reliable fodder base. At this stage of development of the reclamation industry of the Republic of Tatarstan, about 1.5% of the arable land of the Republic is under irrigation reclamation, it produces up to 18.5% of the gross crop production. However, the widespread introduction of land reclamation elements by agricultural producers is limited due to a number of reasons. This series includes: the high cost of restoration, construction, operation and maintenance of reclamation facilities and their network, the lack of technical and financial resources for agricultural enterprises, the need for preliminary costly survey and design work to obtain design estimates (DED). According to expert estimates, to provide food for the inhabitants of the Republic of Tatarstan, it is necessary to have at least 150 thousand hectares of irrigated land, against the currently available 35 thousand hectares. Achieving the indicated value of irrigated lands is not possible without the adoption of a comprehensive program for the development of melioration and agrolandscape farming system, which should be adequately financially secured for the implementation of program activities.

Understanding the Challenges of Affordable Housing Provision in Nigeria: An Analysis of Key Factors and Policy Implications

Affordable housing remains a critical issue in Nigeria, with numerous factors contributing to its scarcity. This paper examines the key factors contributing to the lack of affordable housing in Nigeria, including high construction costs, inadequate urban planning and land use, limited access to finance, inadequate infrastructure, corruption and bureaucracy, limited government support and policy implementation, and high urban area land costs. High construction costs escalate housing prices, posing challenges for low-income earners to afford homes. Inadequate urban planning and land use policies result in spatial inequality, scarcity of available land, and increased housing costs. Limited access to finance restricts low-income earners' ability to secure mortgage financing for affordable homes. High urban area land costs further exacerbate the affordability challenge. Inadequate infrastructure hampers housing development and increases construction costs. Limited government support and policy implementation hinder effective affordable housing provision. Corruption and bureaucratic bottlenecks also hampers the process. These factors underscore the complex nature of the affordable housing crisis in Nigeria and necessitate a comprehensive approach involving collaboration between the government, private sector, and communities. Policy recommendations include improving policy implementation, fostering public-private partnerships, enhancing access to finance, strengthening urban planning strategies, investing in infrastructure, and providing increased government support for affordable housing initiatives. Addressing these factors will contribute to the creation of sustainable and inclusive housing solutions, ensuring that affordable homes become accessible to all Nigerians.

Joint Controller Placement and Control-Service Connection in Hybrid-Band Control

By separating the forwarding and control planes, Software-Defined Networking (SDN) facilitates flexible traffic routing and network management for a service network. Because of the impact of controller deployment on message transmission distances and network latency, controller placement problems have drawn many researchers' attention. However, assumptions in most existing research that all control packets are either transmitted in the service network (i.e., in-band control) or through predetermined control-service connection (i.e., out-of-band control) are not reasonable due to bandwidth resources occupation on the service network or high construction costs. In this paper, we are the first to jointly discuss the controller placement and control-service connection problem for latency minimization in the hybrid-band control mode, which is essentially a bi-level programming optimization problem. Specifically, we introduce auxiliary variables to simplify the above NP-hard problem. Next, Generalized Benders decomposition is used to obtain an optimal solution in theory. In addition, we propose a time-efficient fireworks algorithm with a little latency increment for large-scale networks. Extensive evaluations show that the two proposed algorithms accomplish the desired objectives and respectively achieve up to 35% and 25% latency decrement than greedy algorithms.