Chen Hainan

Chen Hainan
City University of Hong Kong | CityU · Department of Civil and Architectural Engineering

Doctor of Philosophy

About

35
Publications
9,210
Reads
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525
Citations

Publications

Publications (35)
Article
Construction cameras have been used to support autonomous job site monitoring in recent years. However, it remains challenging to find the optimal camera placement configuration in a dynamic job site environment. To address this problem, this paper proposes a camera placement optimization framework using building information modeling (BIM). The fra...
Article
Real-time and automatic monitoring of worker behaviors and activities have great potential to improve construction job site operation. Traditional behavior monitoring of construction workers relies on human interpretation to determine workers' semantic conditions (e.g., tasks performing, safety status). Although advanced sensing technologies provid...
Article
Knowledge management is crucial for construction safety management. Widely collected and well-organized safety-related documents are recognized to be significant in raising the workers' security awareness and then to prevent hazards and accidents. To improve document processing efficiency, automatic information extraction plays an important role. H...
Article
Full-text available
The construction industry continues to be one of the industries with the highest accident rate. With the recent advancement of computing and sensing technologies, more efforts have been made in the field of context-aware autonomous job site monitoring, which can automatically track and evaluate the worker’s behavior and job site conditions in real...
Article
Full-text available
The direction and environment of photovoltaics (PVs) may influence their energy output. The practical PV performance under various conditions should be estimated, particularly during initial design stages when PV model types are unknown. Previous studies have focused on a limited number of PV projects, which required the details of many PV models;...
Article
With the advancement of scientific and engineering research, a huge number of academic literature are accumulated. Manually reviewing the existing literature is the main way to explore embedded knowledge, and the process is quite time-consuming and labor intensive. As the quantity of literature is increasing exponentially, it would be more difficul...
Article
Building occupancy information is the premise of modern building service systems' control and energy conservation. Inaccurate occupancy information could result in a low comfort level and an energy waste. Existing occupancy detecting system relies on indirect and low-resolution environmental sensors, which potentially mislead facility managers and...
Article
This paper proposes a fusion model for developing a data-driven risk association network, based on historical inspection records. The fusion model first re-categorizes the hazards based on the similarity in their occurrence patterns. Second, spatial and temporal heterogeneity of the hazard occurrence is examined, after which site-specific records a...
Article
Full-text available
The building sector takes a large proportion of electricity consumption and carbon emission in high-density urban areas. To reduce the carbon emissions and use energy more efficiently in the building sector, home energy management system (HEMS) is proposed and used. In the HEMS, the prediction of electricity consumption in the short-term future is...
Article
Safety has been a concern for the construction industry for decades. Unsafe conditions and behaviors are considered as the major causes of construction accidents. The current safety inspection of conditions and behaviors heavily rely on human efforts which are limited onsite. To improve the safety performance of the industry, a more efficient appro...
Thesis
Full-text available
The construction industry has an unsatisfactory safety performance. Employing approximately 7% of the world’s workforce, the construction industry accounts for 30-40% of all workplace fatalities. The causes of these fatalities fall predominantly among the “Fatal Four”-falls, electrocution, struck by objects and caught-in- betweens. Previous researc...
Article
Full-text available
At the core of context-aware jobsite management is location information. For outdoor environments, global positioning systems (GPSs) are widely used. For indoor environments, however, an effective localization system has yet to be fully developed. Existing indoor localization systems usually rely on prior or real-time environment learning, and with...
Conference Paper
Full-text available
Buildings represent a large part of energy consumption and carbon emissions in high-density urban areas. Home energy management system (HEMS) is proposed to relieve this problem. Prediction of energy consumption in the short-term future serves as an intelligent tool to make decisions for controlling and optimizing the HEMS. In this paper, one resea...
Article
Full-text available
Smart meters generate a massive volume of energy consumption data which can be analyzed to recover some interesting and beneficial information. Non-intrusive load monitoring (NILM) is one important application fostered by the mass deployment of smart meters. This paper presents a supervised event-based NILM approach for non-linear appliance activit...
Conference Paper
Full-text available
Localization for the resources and workers on construction sites is significant and essential for effective construction projects management. Since global positioning system (GPS) usually does not work indoor, indoor localization is critical for jobsite indoor resource and labor management. However, due to the complex and variable environment situa...
Article
Full-text available
Construction industry has one of the highest accident and fatality rates among other major industries, with more than 60,000 fatal accidents each year worldwide. Falling from height is one of the leading causes of fatalities and injuries in construction. Passive protection devices (e.g., safety net) have been used to minimize the impact of falling...
Article
Full-text available
WSNs (Wireless Sensor Networks) are widely applied in environment monitoring. Especially, in large scale environment monitoring, its flexibility in deployment and self-organization are strong points. However for distribution detection of continuous objects in large scale environment monitoring, there are two primary constraints: energy consumption...
Conference Paper
As the application scope of wireless sensor network (WSN) grows at an amazing rate, the security issue of WSN is becoming increasingly important. Considering a distinct way to address the security problem rather than using the two most common methods which are data encryption and authentication, in this paper, we enhance an off-the-shelf data clust...
Article
Energy efficiency in Wireless Sensor Networks (WSNs) has always been a hot issue and has been studied for many years. Sleep Scheduling (SS) mechanism is an efficient method to manage energy of each node and is capable to prolong the lifetime of the entire network. In this paper a Software-defined Network (SDN) based Sleep Scheduling algorithm SDN-E...
Conference Paper
We propose a SDN-like architecture based WSN and improve the existing EC-CKN Sleep Scheduling mechanism to implement more efficient energy management. A SDN-like architecture is adopted instead of traditional WSN architecture and EC-CKN algorithm is applied as the fundamental algorithm. This paper presents the design, implementation and evaluation...
Article
Software Defined Network (SDN) has long been a research focus since born from the lab of Stanford University. Researches on traditional home networks are faced with a series of challenges due to the ever more complicated user demands. The application of SDN to the home network is an effective approach in coping with it. Now the research on the SDN...
Article
Security issue in Internet of Things (IoTs) has long been the topic of extensive research in the last decade. Data encryption and authentication are the most common two methods to address the security issues in IoTs. However, these efforts are ineffective in detecting the diverse malicious attacks, especially in intrusion detection. Comparatively,...
Article
Data compression on sensing data in Wireless Sensor Networks (WSNs) has long been the topic of extensive research in the last decade. Especially, in video sensor networks, the video and image data that need to be transmitted are relatively larger than common data. However WSNs usually have limited power supply and constrained communication bandwidt...
Article
Full-text available
In this paper, we propose a novel design named multi-module separated linear (MMSL) underwater sensor node. Traditionally, the design of the underwater sensor node is the all-in-one type. The process module, sensor module, and communication module are integrated into one module, and generally, one node carries only one communication module. Therefo...
Conference Paper
Full-text available
The number of vehicles in cities has increased dramatically due to rapid economic development. However, the infrastructure for accommodating these vehicles has grown relatively slow. Alleviating the pressure on the urban transport system and solving the ‘parking difficulty’ problem have thus become hot topics recently. In this paper, an intelligent...
Conference Paper
Full-text available
In this paper, a dynamic architecture is presented for underwater sensor networks based on the physical clustering and intra-cluster autonomy according to the traditional logical clustering theory. In this architecture, the cluster headers eliminate the negative effects of the current and improve the stability of the underwater sensor networks by d...
Conference Paper
Underwater sensor networks are becoming a new field, mainly applied for ocean data collection, ocean sampling, environmental and pollution monitoring, etc. Similar to terrestrial sensor networks, it is essential to provide communication coverage in such a way that the whole monitoring area is covered by the sensor nodes in UWSN. Many important depl...
Article
In this paper, we study the influence of the current on the selection of the cruise path of AUV (Autonomous Underwater Vehicle). We extended the current model into 3D space. According to this extended current model, we analyze AUV's energy consumption under the affects of the water flow and compare it under different cruise paths. This study mainly...
Conference Paper
Cooperative multiple-input multiple-output (MIMO) based communication architecture is used for energy efficient communication in wireless sensor networks. Without increasing transmission energy consumption of nodes, MIMO technology can make use of the cumulative energy of the sender node to increase the sending signal to noise ratio, thus reducing...
Conference Paper
An on-line optimization method for explosives storage scheduling based on genetic algorithm is proposed to make management of explosives storage process more efficient, informative, secure, and intelligent. The information of explosives warehouse is acquired in real time by RFID technology, and an assignment strategy for the location of explosives...
Article
Full-text available
Energy awareness is a vital design issue in wireless sensor networks. Since the amount of sensing data may be large and sensor nodes are usually battery-powered, it is critical to design energy-efficient routing algorithms to prolong network lifetime. Given a certain sensor deployment, the routing strategy of sensor data would have profound effects...

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