Modeling urban building energy use: A review of modeling approaches and procedures

Li, Wenliang,Zhou, Yuyu,Cetin, Kristen,Eom, Jiyong,Wang, Yu,Chen, Gang,Zhang, Xuesong Elsevier 2017 ENERGY Vol.141 No.-

<P><B>Abstract</B></P> <P>With rapid urbanization and economic development, the world has been experiencing an unprecedented increase in energy consumption and greenhouse gas (GHG) emissions. While reducing energy consumption and GHG emissions is a common interest shared by major developed and developing countries, actions to enable these global reductions are generally implemented at the city scale. This is because baseline information from individual cities plays an important role in identifying economical options for improving building energy efficiency and reducing GHG emissions. Numerous approaches have been proposed for modeling urban building energy use in the past decades. This paper aims to provide an up-to-date review of the broad categories of energy models for urban buildings and describes the basic workflow of physics-based, bottom-up models and their applications in simulating urban-scale building energy use. Because there are significant differences across models with varied potential for application, strengths and weaknesses of the reviewed models are also presented. This is followed by a discussion of challenging issues associated with model preparation and calibration.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Advances in urban buildings energy models are reviewed. </LI> <LI> Strengths and weaknesses of urban building energy models are discussed. </LI> <LI> The workflow of physics-based bottom-up models are illuminated. </LI> <LI> Challenges and future research avenues in urban buildings energy use modeling are highlighted. </LI> </UL> </P>

Examination and Analysis of Language Attrition

( Li Xuesong ) 인문사회과학예술융합학회 2021 인문사회과학예술융합학회지 Vol.5 No.1

In contrast, we made a study of the distinction between language attrition and the phenomenon of "languages disappearance ", which including language transfer, aphasia and Alzheimer's dementia, language endangerment, and forgetting through the five attributes of generations relationship, occurrence mechanism, target groups, influencing factors and existence forms. We found though they are in the same category of "disappearance of languages", it appears a big difference between them by their nature. Meanwhile, we take a contrast for differences. Therefore, dividing "language disappear" into language macroscopic disappear and language microscopic disappear on further.

Numerical simulation of bubble’s Motion in Vertical Tube

Li Xuesong,Hanshik Chung,Hyomin Jeong 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2

The problem was derived from a simple process in solar water heating system. In a new designed electro less separated system we involved a kind of bubble pump. Beside experiment analysis, numerical simulation of the core of bubble pump is also very important. In this paper we investigated the motion of bubbles in vertical tube in two dimensions. The heat and mass transfer was simulated. The result of numerical simulation give a significant help of optimize design of bubble pump.

The experimental design of a new kind of bubble pump used on the solar water heater system

Li Xuesong,Jin Zhenhua,Han Shik Chung,Hyo Min Jeong 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11

The application analysis of bubble pump on the domestic solar water heater system is presented. The system investigated in this study is a passive device, self pumping and self regulating. It was test to use the bubble pump on solar water heater system. The test experiment has been taken on the existed vacuum tube about the efficiency, working fluid temperature and pressure and circulated power. In order to check the working temperature and working pressure effectively, the bubble pump was test separated from the solar water heater. The equipment consists of the bubble pump, heater and heat exchanger. The main structure of bubble pump was design depend on the character of two phase flow. The complete system was instrumented to measure pressures, temperatures and flow-rates at various locations. The theory analysis of design bubble pump has been given and the experiment design has been included in the paper.

삼 언어 환경에서 모국어 소멸 사례 연구에 대한 후속 논의

( Li Xuesong ) 지속가능경영학회 2022 인문사회과학예술융합학회지 Vol.6 No.2

원어민 언어 소멸에 대한 139일간의 사례 연구가 초기에 시행되었으며, 이 연구 결과를 기반으로 깊이 있는 후속 논의를 시행했습니다. 논의 주제는 다음과 같습니다: (1) 망각, 교차 언어적 영향, 또는 언어 소멸. 이 부분은 세 가지 사항에 대한 자세한 비교 및 차이점을 다룹니다. (2) 다중 언어 학습자의 빌리기 심리 용어에 대한 첫 번째 선택. 이 논의 부분은 다른 언어에서 빌리기를 기반으로 합니다. (3) 원어민 언어 소멸 사례 연구에서 강조된 영향 요인. 이 부분은 언어 접촉, 언어 환경, 감정적 요인 등과 밀접한 관련이 있는 영향 요인에 중점적으로 초점을 맞춥니다. A 139 day case study on native language attrition was conducted in the early stage, and based on the results of this study, we conducted in-depth follow-up discussions. The discussion topics include but are not limited to: (1) forgetting, cross linguistic influence, or language attrition. This section discusses the detailed comparison and differentiation of the three. (2) The first choice for multilingual learners to borrow psychological vocabulary. This section of the discussion is also based on borrowing from other languages. (3) Highlighted influencing factors in case studies of native language attrition. This part mainly focuses on the influencing factors closely related to the case, such as language contact, language environment, emotional factors, etc.

언어 소모로의 언어전환 사례연구

( Li Xuesong ) 인문사회과학예술융합학회 2020 인문사회과학예술융합학회지 Vol.4 No.2

The phenomenon that language transfer turns into language attrition is seldom concerned by language researchers. From the perspective of theoretical comparison, the two are not the same in the carrier, influencing factors, intergenerational relations and existing form, which is one of the reasons for less attention. In a more than two-year follow-up survey of a subject who has lived in Korea for more than ten years, it is found that the word "Yushun" has successfully replaced the word "Yuxu" (word order) from the subject's mental lexicon, and repeated regression reminders have been made in the study, but the word "yuxu" still shows no sign of regression. To be sure, we can guess and even have reason to believe that if the subject return to their native language environment for a long time in the future, the word "Yuxu" can still regression to their mental lexicon. But unfortunately,in more than two years' follow-up survey, only one case of language transfer transformed into language attrition was found from a large number of corpus. In other words, it is not easy to capture the phenomenon that language transfer turns into language attrition.

Performance evaluation of bubble-pump used in solar water heater system

Li Xuesong,Gi Tae Park,Han Shik Chung,Hyo Min Jeong 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-

The application analysis of bubble pump on the domestic solar water heater system is presented. The system investigated in this study is a passive device, self pumping and self regulating. It was test to use the bubble pump on solar water heater system. The test experiment has been taken on the existing vacuum tube about the efficiency, working fluid temperature and pressure and circulated power. In order to check the working temperature and working pressure effectively, the bubble pump was test separated from the solar water heater. The equipment consist of the bubble pump, heater and heat exchanger. The main structure of bubble pump was design depend on the character of two phase flow. The complete system was instrumented to measure pressures, temperatures and flow-rates at various locations. The theory analysis of design bubble pump has been given and the experiment design has been included in the paper.

The Application analysis of Bubble Pump on Solar Water Heater System

Li Xuesong,Jin Zhenhua,Tony,Han Shik Chung,Hyo Min Jeong 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-

The application analysis of bubble pump on the domestic solar water heater system is presented. The system investigated in this study is a passive device, self pumping and self regulating. It was test to use the bubble pump on solar water heater system. The test experiment has been taken on the existing vacuum tube about the efficiency, working fluid temperature and pressure and circulated power. In order to check the working temperature and working pressure effectively, the bubble pump was test separated from the solar water heater. The equipment consist of the bubble pump, heater and heat exchanger. The main structure of bubble pump was design depend on the character of two phase flow. The complete system was instrumented to measure pressures, temperatures and flow-rates at various locations. The theory analysis of design bubble pump has been given and the experiment design has been included in the paper.

关于推广与普及语言政策中测评体系的若干思考

( Li Xuesong ) 인문사회과학예술융합학회 2019 인문사회과학예술융합학회지 Vol.3 No.1

Since the implementation of the Law of the People's Republic of China on General Languages and Characters, great changes have taken place in the language and character life of our country. The three evaluation systems involved in this law, Putonghua proficiency test, Chinese character application proficiency test and Chinese proficiency test, are gradually improving, but there are still many shortcomings. Among them, the Putonghua proficiency test system is relatively sound. Taking it as the blueprint, under the circumstances that the law, regulations, politics, economy, culture and academic background are fully allowed, the proposed construction of the Chinese character application proficiency test and Chinese proficiency test and other evaluation system will undoubtedly lead to a new step in language life, which is also a guarantee to improve the quality of language life for the whole people. In the construction of promotion and popularization, the evaluation system needs to focus on two questions: first, why to establish the evaluation system; second, how to establish the evaluation system. The construction of the new evaluation system will not only produce far-reaching academic significance, but also bring deep-seated economic benefits for socialist construction and development.

OPTIMAL DEIMNSION DESIGN OF CORE TUBE INSIDE OF BUBBLE PUMP USED ON SOLAR FLUID HEATING SYSTEM

Li Xuesong,GiTae Park,HanShik Chung,HyoMin Jeong 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10

The optimal dimension design of core tube inside of bubble pump is presented. The flow regime in this study is vertical tube slug flow. In order to get the optimal performance of bubbles to lift the liquor, by the help of which a target pressure difference was produced for the circulations of working fluid in the system, the analysis both from experiment result and theoretical model were included to design the length and diameter of the core tube in this paper. Additionally, the finally working condition especially the pressure was given to evaluate the optimal design.