김병선 교수

웹 이용 행위를 설명하는 지금까지의 기존 연구는 개인의 심리적 요인을 강조하느냐, 아니면 이용 환경의 구조적 요인을 강조하느냐에 따라 크게 양분되어왔다. 개인의 심리적 요인을 강조하는 연구에서는, 웹이 이용자의 관여 수준을 높이는 여러 장치들을 포함하고 있으며, 이에 따라 이용자들은 보다 능동적으로 웹을 이용할 수 있다고 가정한다. 한편, 구조적 요인을 강조하는 연구에서는, 웹 역시 일종의 매스 미디어이며, 이에 따라 웹 이용자의 행위는 이용 환경의 구조적 요인들에 제약을 받게 되는 것으로 가정하고 있다. 이 논문은 이와 같이 웹 이용 행위에서 이용자의 심리적 특성을 강조하는 기존 연구와 이용 환경의 구조적 조건을 강조하는 기존 연구의 논의들을 통합적으로 고려하여, 웹 이용 행위를 4가지 차원으로 구분하고, 각 차원의 행위에 영향을 미치는 심리적 요인과 구조적 요인의 상대적 영향력 차이를 분석함으로써 웹 이용 행위의 능동적 특성을 새롭게 논의하고자 한 연구이다. 연구 결과, 웹 이용

Recycling spent lithium-ion batteries (LIBs) is crucial to prevent environmental pollution and recover valuable metals. Traditional methods for recycling spent LIBs include hydrometallurgy and pyrometallurgy. Among these methods, solvent extraction can selectively extract valuable metals in spent LIB leachate. Meanwhile, spent LIBs that underwent pyrometallurgical treatment generate a so-called ‘black alloy’ of Ni, Co, Cu, and so on. These elements in the black alloy need to be separated by solv

The purpose of this study was to develop a data-driven predictive model that can predict the supply air temperature (SAT) in an air-handling unit (AHU) by using a neural network. A case study was selected, and AHU operational data from December 2015 to November 2016 was collected. A data-driven predictive model was generated through an evolving process that consisted of an initial model, an optimal model, and an adaptive model. In order to develop the optimal model, input variables, the number o

Today's data centers require precise, stable environments for sensitive IT equipments to operate optimally. As the latest computing equipment becomes smaller and uses the same or even more electricity than the equipment it replaced, more heat is being generated in data centers. There are 4 basic ways to collect and transport heat from the IT environment to the outdoor environment such as air cooled systems, glycol cooled systems, water cooled systems and chilled water systems. Each method uses t

More than 60% of people all over the world are living in urban areas, and the people and buildings keep spending energy, and it makes excessive problems of global energy system. Currently, lots of attention is being paid for how to design HVAC(heating ventilating air conditioning) system in large-scale and high-rise buildings. Increasing awareness of energy use is main point of this research. HVAC systems' energy characteristics are not clearly identified and understood, so the optimal design of

Currently as the diffusion rate of Housing and the standard of living come to increase, people have a demand for higher living quality, especially people want to live close to nature such as local parks, mountains, and rivers, and want to see them as a view through windows of each apartment unit. The view from each window of the building is more and more important from the beginning of the design stage especially high-rise downtown apart buildings.This study aims to develope the view assessment

Recently, there is solar radiation matter on cooling loads in office buildings. In the summer, solar radiation has serious effect on cooling loads, therefore if solar radiation are possible to controls, cooling load could be decreased. This study aims on improving energy performance strategy of perimeter zone due to solar radiation in office buildings, and analyze the influence of external shading device that can rely on instrument installation, azimuth and shading length. It was conducted to an

In the high oil prices age, intensification of energy efficiency promotion in the building sector is required. Windows are dominating large percentage whole building loads and are regarding as the primary target of energy efficiency. The purpose of this study is to improve energy efficiency of windows in high-rise residential buildings through the evaluation of their indoor temperature change & heating and cooling energy consumption. Analysis of Indoor temperature change and building energy cons

Characteristics of contemporary lives and cultures, and the problems from development in various types of building materials has placed interior environment section in very important position among Green Building Certification System criteria.Therefore, this study analyzed the Seoul Joong-Ang Postoffice which received pre-certification in environmentally-friendly building certification, and analysis of LEED v.2.1 and BREEAM Office 2005 was focused on interior environment.Evaluation items and sta

The SARS virus began to appear and spread in North America and Southeast Asia in the early 2000's, infecting and harming many people. In the process of examining the causes for the virus, studies on the airborne SARS virus and the way it spread were carried out mainly in the medical field. In the field of architecture, studies were done on the diffusion of air pollutants in buildings using gases such as CO2, N2O, or SF6, but research on virus diffusion was limited. There were also explanations o

The aim of the present study was to investigate the thermal performance of window systems using full-scale measurements and simulation tools. A chamber was installed on the balcony of an apartment to control the temperatures which can create condensation on the interior surfaces of window systems. The condensation process on the window was carefully scrutinized when outdoor and indoor temperature and indoor relative humidity ranged from −15 °C to −20 °C, 23 °C to 24 °C, and 50% to 65%, respectiv

Recently, the considerable increase of the old people is expected annually and there is a great demand for facilities for the old people like a nursing homes for the elderly. So, it is desirable for the old people that is needed that the expansion of specified facilities and improvement of services for these old people. The purpose of this study is to assess nursing homes' indoor environment of case study using domestic and foreign Green Building Certification Criteria, compare and analyze asses

With the advancement of technology, the density of IT equipment, heat load and power consumption continue to increase in high density internal-load dominated buildings as datacenters. To improve the HVAC system’s energy performance and efficiency, there is a need to find methods of using outside air. Through cooling tower control that is based on outside wet-bulb temperature, the water-side economizer made it possible to achieve a maximum energy performance improvement of about 16.6% over the ba

This study is as a case study to make improvements on indoor ventilations by comparatively analyzing airflow rates in units of the high-rise residential building in which mechanical ventilation system mandated for the ventilation. Airflow rates of the applied ventilation modes was measured by tracer gas method while simultaneously conducting CFD simulations to investigate the air-age distribution of each mode. In summary of the study, air exchange rate under the infiltration and ordinary-time mo

Today's IT server rooms of data centers require precise, stable environments in order for sensitive electronics to operate optimally and IT is advancing at a rapid pace, resulting in the cooling energy of data center has been steadily increasing. In this research, economical aspects of energy consumption and load-profile were studied through the survey of domestic data centers that need all year round cooling load. And through DOE-2 simulation program, energy using patterns of cooling system com