동계정기학술발표회 : 전문 직업교육 프로그램 개발 - 전문대학 세무회계과를 중심으로 -

공해영 ( He Young Kong ) 한국세무회계학회 2004 발표논문집 Vol.16 No.-

Modified Procedures for ALPPS Based on a Risk-Reduced Strategy: Paralleled Clinical Evaluation at Multiple Institutions

Ya-Lin Kong,Ying Xing,Jie Li,Cheng-Li Liu,Xiao-Jun He,Cheng Wang,Jiang-Min Chen,Ling-Hong Kong,Xu Han,Hong-Yi Zhang 연세대학교의과대학 2021 Yonsei medical journal Vol.62 No.10

Purpose: We compared the clinical outcomes of modified procedures for associating liver partition and portal vein ligation for staged hepatectomy (ALPPS) based on a risk-reduced strategy with those of classic ALPPS procedures in treating large liver carcinoma. Materials and Methods: Short-term outcomes, increases in future liver remnant (FLR) and functional FLR (FFLR), and overall survival (OS) were compared between 45 consecutive patients treated with modified ALPPS procedures and 34 patients treated with classic ALPPS procedures. Results: Clinical outcomes after the 1st-stage operation markedly improved with the modified procedures. Although the proportions of liver cirrhosis and hepatocellular carcinoma were higher in the modified group, the mortality and incidence of severe complications did not increase. FLR and FFLR hypertrophy at 1 week after the 1st-stage operation were similar in both groups; however, kinetic growth rates in the modified group were lower. OS rates were similar. Conclusion: Modified ALPPS procedures could be safely applied to provide long-term survival for patients with liver cirrhosis without sufficient FLR.

Impacts of peat on nitrogen conservation and fungal community composition dynamics during food waste composting

He Zaihua,Li Qiang,Zeng Xiaoyi,Tian Kai,Kong Xiangshi,Tian Xingjun 한국응용생명화학회 2020 Applied Biological Chemistry (Appl Biol Chem) Vol.63 No.6

Peat, as a heterogeneous mixture of decaying plant debris and microbial residues, has been widely used in many fields. However, little research focused on the impact of peat addition on food waste composting. To fill this gap, a composting experiment of food waste mixed with five varying percent peat 0, 5, 10, 15, and 20% (w/w, dry weight) was designed to investigate the effect of different dosages of peat on nitrogen conservation, physiochemical parameters, and fungal community dynamics during composting. The results showed that adding peat elevated the peak temperature of composting, lowered final pH, reduced ammonia emissions and increased the final total nitrogen content. Compared to control, adding 5, 10, 15, and 20% peat decreased ammonia emissions by 1.91, 10.79, 23.73, and 18.26%, respectively, during 42 days of composting. Moreover, peat addition increased fungal community diversity especially during maturation phase. The most two abundant phyla were Basidiomycota and Ascomycota in all treatments throughout the composting process. At the end of composting, in treatments with adding 10 and 15% peat, the richest fungi were Scedosporium spp. and Coprinopsis spp., respectively. Simultaneously, canonical correlation analyses showed that pH, moisture content, and seed germination index had significant association with fungal community composition. The study also showed that fungal community and nitrogen conservation had no direct obvious relation during composting. Overall, the results suggest that the addition of peat could efficiently enhance nitrogen conservation through reduction of ammonia emissions and 15% peat addition is the optimal formula for food waste composting.

Cracks evolution and multifractal of acoustic emission energy during coal loading

Kong, Xiangguo,Wang, Enyuan,He, Xueqiu,Liu, Xiaofei,Li, Dexing,Liu, Quanlin Techno-Press 2018 Geomechanics & engineering Vol.14 No.2

Coal samples with different joints morphology were subjected to uniaxial compression experiments, cracks evolution was recorded by Nikon D5300 and acoustic emission (AE) energy signals were collected by AEwin Test for Express-8.0. During loading process, coal samples deformed elastically with no obvious cracks changes, then they expanded gradually along the trace of the original cracks, accompanied by the formation of secondary cracks, and eventually produced a large-scale fracture. It was more interesting that the failure mode of samples were all shear shape, whatever the original cracks morphology was. With cracks and damage evolution, AE energy radiated regularly. At the early loading stage, micro damage and small scale fracture events only induced a few AE events with less energy, while large scale fracture leaded to a number of AE events with more energy at the later stage. Based on the multifractal theory, the multifractal spectrum could explain AE energy signals frequency responses and the causes of AE events with load. Multifractal spectrum width (${\Delta}{\alpha}$), could reflect the differences between the large and small AE energy signals. And another parameter (${\Delta}f$) could reflect the relationship between the frequency of the least and greatest signals in the AE energy time series. This research is helpful for us to understand cracks evolution and AE energy signals causes.

Analysis on temperature field of friction pair of aviation friction clutch based on different groove shapes of friction disk

He-yun Bao,Weidi Kong,Xiaonan Hou,Rupeng Zhu 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.8

To examine the influence of the groove shape of a friction disk on the transient temperature field in the engagement process of aviation wet friction clutch, a transient thermal analysis model of friction clutch was established, and the application method of thermal boundary conditions, including the calculation of convective heat transfer coefficient and heat flux density, was studied. The transient heat loading process was established by the partition method of friction disk and steel disk. The temperature characteristics of wet clutch friction pairs with different groove shapes during the engagement process were analyzed and tested on an SAE#2 testing machine. Results show that when the clutch is engaged, the temperature of the friction pair composed of two-way parallel groove, three-way parallel groove, and waffle groove friction disk increases continuously at first and finally decreases slightly; the highest temperature of the friction disk and steel disk is at the ring near the outer ring of the friction disk;and the waffle groove friction disk is more suitable for aviation wet friction clutch.

Monitoring moisture content of timber structures using PZT-enabled sensing and machine learning

Qingzhao Kong,Lin Chen,Hai-Bei Xiong,Yufeng He,Xiuquan Li 국제구조공학회 2022 Smart Structures and Systems, An International Jou Vol.29 No.4

Timber structures are susceptible to structural damages caused by variations in moisture content (MC), inducing severe durability deterioration and safety issues. Therefore, it is of great significance to detect MC levels in timber structures. Compared to current methods for timber MC detection, which are time-consuming and require bulky equipment deployment, Lead Zirconate Titanate (PZT)-enabled stress wave sensing combined with statistic machine learning classification proposed in this paper show the advantage of the portable device and ease of operation. First, stress wave signals from different MC cases are excited and received by PZT sensors through active sensing. Subsequently, two non-baseline features are extracted from these stress wave signals. Finally, these features are fed to a statistic machine learning classifier (i.e., naive Bayesian classification) to achieve MC detection of timber structures. Numerical simulations validate the feasibility of PZT-enabled sensing to perceive MC variations. Tests referring to five MC cases are conducted to verify the effectiveness of the proposed method. Results present high accuracy for timber MC detection, showing a great potential to conduct rapid and long-term monitoring of the MC level of timber structures in future field applications.

The path analysis of carbon emission reduction: A case study of the Silk Road Economic Belt

Yang Kong,Weijun He 대한환경공학회 2020 Environmental Engineering Research Vol.25 No.1

This paper uses super-efficiency DEA model and Malmquist index to evaluate the carbon emission efficiency (CEE) values of the nine western provinces along the “Silk Road Economic Belt” for the period from 2000 to 2015, and analyses the influencing factors of the CEE. The major findings of this study are the following: (1) the overall CEE of the nine western provinces is not high, and there are significant inter-provincial differences in the CEE. Meanwhile, the provinces with higher levels of economic development generally have higher CEE. (2) The annual total factor productivity (TFP) of the nine western provinces, which is mainly determined by technological change, is greater than 1. Moreover, the total average growth rate of the TFP is 15.5%. (3) The CEE of the nine western provinces is not spatially dependent. In addition, the urbanization, openness, use of energy-saving technologies and research and development (R&D) investment have a significant positive impact on the CEE values, while the industrial structure, foreign direct investment, fixed asset investment, government expenditure levels and energy structure have a significant negative impact on the CEE. Among them, R&D investment is the primary factor in promoting the development of CEE, and the government expenditure has the greatest negative impact on the CEE.

소셜미디어 빅데이터 분석을 활용한 농촌체험관광 실태와 인식변화

강소영 ( Kong So-yeoung ),왕학 ( Wang He ) 경기대학교 관광종합연구소 2019 여가관광연구 Vol.31 No.-

본 연구는 국내 포털사이트인 네이버(Naver)와 다음(Daum)의 블로그에서 축적된 빅데이터를 활용하여 농촌체험에 대한 소비자들의 인식 변화와 트렌드 파악 및 시장 흐름 등을 분석한 후 농촌체험 활성화의 지속적 성장 방안을 위한 기초자료를 제시한다. 자료 분석기간은 2014년 1월 1일부터 2017년 12월 31일까지 4년간을 연구기간으로 잡았다. 본 연구는 텍스톰을 이용하여 네이버와 다음에서 ‘농촌체험’ 키워드를 포함한 블로그의 4년간의 자료를 수집하고 데이터 정제과정을 통해 도출한 단어들 시각한 워드 네트워크를 만들었고 또한 도출된 단어들을 바탕으로 1-mode 매트릭스 데이터를 통해 유사성을 지닌 핵심어들이 형성하는 집단을 분석하였다. 따라서 본 연구의 결과는 소비자의 목적과 욕구를 알 수 있는 데이터를 제시했다는 점에 의의가 있으며, 농촌체험관광의 최근 트렌드를 파악함으로써 미래의 농촌체험을 예측해 볼 수 있다는 점을 시사하고 있다. This research utilizes big data accumulated from blogs of Naver and Daum, a local portal site, to analyze changes in consumers' perception of rural experiences and trends and market trends, and then presents basic data for sustainable growth of rural experiences. The data analysis period was set for four years from Jan. 1, 2014 to Dec. 31, 2017. Using text-tom, this study collected four years of data from blogs, including keywords from 'rural experiences' from Naver and Daum, created word networks visualizing words derived through the data refining process, and analyzed groups formed by key words with similarity through 1-mode matrix data based on derived words. Thus, the results of this study are meaningful in that it presents data that shows the purpose and desire of consumers, and suggests that by grasping the latest trends in rural experience tourism, it is possible to predict the future rural experience.

고속주행 교행차량의 공기역학적 주행안정성에 관한 수치해석 연구

공위거(Kong Weiju),하양(He Yang),최호승(Ho Seung Choi),김철호(Chul Ho Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.08

가스터빈(MGT)엔진의 연료분사 노즐 형상 변화가 혼합가스 생성에 미치는 영향에 대한 수치해석 연구

공위거(Weiju Kong),하양(Yang He),김철호(Chul-Ho Kim) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12

The operating condition of MGT engine is hard and crucial with its high operating speed and high temperature but it is highly concerned in industry because of its specific power(power to weight). Recent research topics of gas turbine engine are on high-grade materials, cooling design of high-temperature parts, heat blocking and combustion chamber mixture gas generation. In here, an effect of shape change of the injector nozzle was studied to understand its effect to the formation of well-mixed homogeneous mixture in the combustion chamber for the higher combustion efficiency of the model engine. For the performance analysis of mixture formation in the injection process with the change of the shape of the injector nozzle, three parameters; diffusion angle, diffusion distance and fuel volume flowrate injected into the combustion chamber were analyzed. From the study, it was found that Model-1 with the right-angle edged injection hole and Model-3 with the rounded surface of the inside of the injection nozzle have better performance on the mixed gas formation for the higher combustion performance.