An ecological industrial park consists of several factories and enterprises. Here, there exist connection chains, where the products, semi-finished products and waste of any enterprise are used as the materials or energies for production of other enterprises.

The key to developing a successful ecological industrial park and setting up a balanced ecological relationship among relevant enterprises is to determine the connections between different enterprises in the ecological industrial park. Particularly, a material and energy flow relationship among different enterprises that established chains to form an inter-dynamic structure is needed. If such structure is impossible, an ecological industrial park cannot be formed.

Ri Jun Hyok, a researcher at the Institute of Mirae Industrial Technology, proposed an ecological chain index of an ecological industrial park by applying the general theories of ecology, and then drew the relations between the ecological chain indexes and the recycling rates of semi-finished products and wastes. In addition, he proposed a method for evaluating ecological industrial parks by using the ecological chain index.

First, he defined the ecological chain index of an ecological industrial park, and provided its calculation equation. Second, he defined semi-finished products and wastes of an ecological industrial park and provided its calculation equation. Then, he provided a relational expression of the recycling rate of semi-finished products and wastes and of its ecological chain index.

The ecological chain index and the recycling rate of semi-finished products and wastes can be applied to the planning and construction of ecological industrial parks.

Accurate knowledge of slag level in iron-making processes is a key issue for scientific furnace control to increase productivity and ensure safe operation.

The level measurement method can be broadly divided into contact and non-contact. Contact methods are pressure, float, electric resistance and conduction methods and non-contact methods include microwave, ultrasonic and radiation. The level can be measured by selecting a suitable method with the characteristics of measurement objects and the measurement environments in consideration.

In the Hismelt process, the core is a smelting reduction vessel, where the molten steel is tapped in a continuous mode by a siphon front, unlike conventional blast furnaces, and the slag discharge is periodic. Contact methods are not suitable for measuring the slag level in a closed Hismelt furnace, but non-contact methods are needed. Radiation method is appropriate for measuring the level of boiling slag in a closed furnace like a Smelt Reduction Vessel (SRV).

With an attempt to evaluate the level of slag in a Smelt Reduction Vessel (SRV) where hot air is introduced into a closed furnace and iron ore is melted, Ri Hye Won, a researcher at the Institute of Analysis, proposed a method of level measurement. In this method, radiation source and radiation detectors are installed outside the furnace and each detector is operated like a relay.

He selected a ¹³⁷Cs source with radioactivity of 3.2Ci as the radiation source and placed five NaI(Tl) scintillation detectors uniformly in the interval from the copper cooling box position to the hot wind lance, the interface of slag and molten metal, to measure the level of slag flow zone (2m).

The Monte Carlo simulation and experiments verified that slag levels in the range of 10~200cm from the copper cooling box could be estimated with accuracy of ±10cm.

The Visible Light Communication (VLC) is the technology for sending information by flickering visible light at insensible speed. This is the principle of sending data by detecting "On/Off" of lights, where "On" is digit "1" or “Off” is digit “0”. VLC is available where radio propagation is limited such as the interiors of hospitals or companies. In addition, because communication is available only in the visible range of LEDs, high security is guaranteed. Since LEDs are flickered at tremendously high speed, both illumination and communication are possible.

For the indoor Visible Light Communication (VLC) based on white LED as a new communication system, a channel model has not been established. Its measurement and establishment are still in its exploratory stages.

Kim Hyon Chol, a researcher at the Faculty of Communication, has summarized the exposition of indoor VLC links and conducted a theoretical and experimental analysis of the photon model of the VLC system from a detailed point of view.

The proposed indoor light channel models can be used in VLC for several indoor environments.