Assuring explainability on demand response targeting via credit scoring

Lee, Kyungeun,Lee, Hyesu,Lee, Hyoseop,Yoon, Yoonjin,Lee, Eunjung,Rhee, Wonjong Elsevier 2018 ENERGY Vol.161 No.-

<P><B>Abstract</B></P> <P>As data-driven innovation becomes a main trend in the energy sector, explainability of data-driven actions is becoming a major fairness issue for the residential applications, and it is expected to become a requirement for regulatory compliance. Explainability, however, often demands a sacrifice in prediction performance and affects the effectiveness of data-driven actions. In this study, we consider data-driven customer targeting in an incentive-based residential demand response program, and investigate the explainability-performance tradeoff when using simple-rule based, machine learning, and credit scoring methods. Credit scoring, that has been a popular solution in the finance discipline for over 60 years, is a scorecard based modeling method that can surely provide explainability. We first provide the detailed steps of applying credit scoring to the demand response problem. Then, we use a dataset of 14,525 households obtained from a real demand response program and analyze two prediction problems – participation prediction and behavior change prediction. The results show that credit scoring can achieve a comparable performance as the best-performing machine learning methods while providing full explainability. Our results suggest that credit scoring can be a promising explainability option for broader energy sector problems.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A quantitative analysis of data-driven targeting in residential DR. </LI> <LI> Explainability of data-driven actions and its relation to fairness. </LI> <LI> Details of implementing credit scoring, which has good explainability, for DR. </LI> <LI> A case study of incentive DR, where the DR was operated through a smartphone app. </LI> <LI> Credit scoring can achieve a comparable performance as machine learning methods. </LI> </UL> </P>

Regulators and class numbers of an infinite family of quintic function fields

Lee, Jungyun,Lee, Yoonjin Institute of Mathematics, Polish Academy of Scienc 2018 Acta arithmetica Vol.185 No.2

Investigation of Soil and Groundwater Contaminated by Gasoline and Lubricants Around a Railroad Station in S City, Korea

Lee, Hwan,Lee, Yoonjin Korean Society of Environmental Health 2012 한국환경보건학회지 Vol.38 No.6

Objective: This research was performed to evaluate the state of oil pollution in an area surrounding a railway station that has over 100 years of business history as a railway station in S City, Korea. The amount of polluted soil was estimated, and the target area for remediation was assessed in this study to restore the oil-polluted area. Methods: To accomplish this aim, five observation wells were installed for the sampling of groundwater, and soil was sampled at 33 points. Electric resistance studies and a trench investigation were undertaken to understand the geological conditions of the site, and the groundwater movement in this area was simulated by MODFLOW. Physiochemical analyses were conducted to determine the quality of the groundwater and the current state of oil pollution influenced by that of the soil. Results: The mean level of total petroleum hydrocarbons (TPHs) in this area was 1,059 mg/kg, and the area for remediation was determined to be 7,610 mg/kg. Levels of benzene, toluene, ethylbenzene, and xylene (BTEX) were determined to be under the legal standard. Conclusion: In terms of depth, the biggest area polluted by TPH found was between 0 and 1 m from ground level, and the affected area was 5,900 $m^3$. TPHs were not detected in groundwater. Diesel and lubricating oil were the main causes of TPH pollution at this railway station.

Regulators of an Infinite Family of the Simplest Quartic Function Fields

Lee, Jungyun,Lee, Yoonjin Canadian Mathematical Society 2017 Canadian journal of mathematics Vol.69 No.3

<B>Abstract</B><P>We explicitly find regulators of an infinite family {<I>Lm</I>} of the simplest quartic function fields with a parameter m in a polynomial ring [t], where is the finite field of order q with odd characteristic. In fact, this infinite family of the simplest quartic function fields are subfields of maximal real subfields of cyclotomic function fields having the same conductors. We obtain a lower bound on the class numbers of the family {<I>Lm</I>} and some result on the divisibility of the divisor class numbers of cyclotomic function fields that contain {<I>Lm</I>} as their subfields. Furthermore, we find an explicit criterion for the characterization of splitting types of all the primes of the rational function field (t) in {<I>Lm</I>}.</P>

Ex Vivo Permeability Characteristics of Porcine Buccal Mucosa to Drugs with Various Polarity

Lee, Jaehwi,Lee, Yoonjin,Yoon, MiKyeong,Choi, Young Wook 한국약제학회 2005 Journal of Pharmaceutical Investigation Vol.35 No.2

The aim of this study was to analyze characteristics of the barrier function of excised porcine buccal mucosa to the test compounds, estradiol, propranolol HCI, melatonin, and mannitol with a wide range of partition coefficient values. The permeability of melatonin was measured through frozen, stored, and fresh porcine buccal mucosa to examine the impact of storage conditions on the permeability of porcine buccal mucosa. The results demonstrated that the ex vivo permeability of the porcine buccal mucosa was greater for more lipophilic solutes, which was consistent with a series of molecules trans-ported by passive transepithelial diffusion. The melatonin permeation profiles through frozen, stored. and fresh mucosa illustrated that damage was incurred by the freezing process of the mucosal tissue. leading to loss of the barrier function and thereby an increased permeation coefficient. It can be observed that the influence of compound lipophilicity on the association of the compounds with buccal mucosa was clean. The relationship between permeation coefficient and Log P values for the four compounds investigated demonstrated a proportional relationship, further confirming the importance of the lipophilicity of a compound to permeate the buccal mucosa. These results showed that the ex vivo porcine buccal mucosa model is a suitable tool to screen oral mucosal permeability.

Benexate hydrochloride betadex modulates nitric oxide synthesis and cytokine expression in gastric ulcers

Lee, Jae Min,Lim, Ji-Youn,Kim, Yoonjin,Kim, Ye Ji,Choi, Hyuk Soon,Kim, Eun Sun,Keum, Bora,Seo, Yeon Seok,Jeen, Yoon Tae,Lee, Hong Sik,Um, Soon Ho,Kim, Chang Duck,Ryu, Ho Sang,Sul, Donggeun,Hong, Jungh D.A. Spandidos 2016 Experimental and therapeutic medicine Vol.12 No.2

<P>The present study investigated benexate hydrochloride betadex (BHB)-mediated ulcer healing, and changes to microcirculation modulated through nitric oxide synthase (NOS) and anti-inflammatory activity. A rat model of gastric mucosal injury was established through injection of a 60% acetic acid solution into the stomach. Following ulcer induction, the rats were administered BHB orally for 5 days at doses of 0, 100, 300 or 1,000 mg/kg. The highest dose of BHB was also administered with or without L-<I>NG</I>-nitroarginine methyl ester (L-NAME). The area of gastric ulcers was determined by planimetry, and expression of cyclooxygenases (COX), cytokines and NOS in stomach tissues were measured using western blotting. Compared with the control group, gastric ulcer size was significantly decreased in the 1,000 mg/kg BHB-treated group (P<0.05). Administration of BHB led to a significant increase in endothelial (e)NOS expression (P<0.05). Although acetic acid co-treatment with L-NAME induced more severe mucosal damage, BHB decreased COX expression and tumor necrosis factor-α levels when administered with the nitric oxide inhibitor, L-NAME (P<0.05). BHB exhibited protective effects in a rat model of gastric ulcers, which were associated with a decrease in pro-inflammatory cytokine levels and the activation of eNOS.</P>

Lipolytic efficacy of alginate double-layer nanoemulsion containing oleoresin capsicum in differentiated 3T3-L1 adipocytes

Lee, Mak-Soon,Jung, Sunyoon,Shin, Yoonjin,Lee, Seohyun,Kim, Chong-Tai,Kim, In-Hwan,Kim, Yangha TaylorFrancis 2017 Food & nutrition research Vol.61 No.-

<P><B>ABSTRACT</B></P><P><B>Background</B>: Oleoresin capsicum (OC) is an organic extract from fruits of the genus <I>Capsicum</I>, and has been reported to have an anti-obesity effect.</P><P><B>Objective</B>: This study comparatively investigated lipolytic effects of single-layer nanoemulsion (SN) and alginate double-layer nanoemulsion (AN) containing OC in 3T3-L1 adipocytes.</P><P><B>Methods</B>: SN and AN were compared by analyzing the intracellular lipid accumulation, triglyceride (TG) content, release of free fatty acids (FFAs) and glycerol, and mRNA expression of genes related to adipogenesis and lipolysis were analyzed in fully differentiated 3T3-L1 adipocytes.</P><P><B>Results</B>: Compared with SN, AN exhibited higher efficiency in inhibiting the intracellular lipid accumulation and TG content, and enhanced the release of FFAs and glycerol into the medium. In AN-treated cells, mRNA levels of peroxisome proliferator-activated receptor-γ and the fatty acid-binding protein adipocyte protein-2, which are involved in adipogenesis, were down-regulated, whereas those of genes related to lipolysis, including hormone-sensitive lipase and carnitine palmitoyl transferase-1α, were up-regulated compared with SN-treated cells.</P><P><B>Conclusion</B>: The lipolytic effect of AN was greater than that of SN; this was partly associated with the increased TG hydrolysis via induction of lipolytic gene expression and suppression of adipogenic gene expression in 3T3-L1 adipocytes.​​​​</P>

Keyword Analysis of Twitter data on New Digital Technology through Co-occurrence network and ERGM

Yoonjin Lee,Hohyun Jung 한국자료분석학회 2023 한국자료분석학회 학술대회자료집 Vol.2023 No.1

Indivisibility of divisor class numbers of Kummer extensions over the rational function field

Lee, Yoonjin,Yoo, Jinjoo Elsevier 2018 Journal of number theory Vol.192 No.-

<P><B>Abstract</B></P> <P>We find a complete criterion for a Kummer extension <I>K</I> over the rational function field k = <SUB> F q </SUB> ( T ) of degree <I>ℓ</I> to have indivisibility of its divisor class number <SUB> h K </SUB> by <I>ℓ</I>, where <SUB> F q </SUB> is the finite field of order <I>q</I> and <I>ℓ</I> is a prime divisor of q − 1 . More importantly, when <SUB> h K </SUB> is not divisible by <I>ℓ</I>, we have <SUB> h K </SUB> ≡ 1 ( mod ℓ ) . In fact, the indivisibility of <SUB> h K </SUB> by <I>ℓ</I> depends on the number of finite primes ramified in K / k and whether or not the infinite prime of <I>k</I> is unramified in <I>K</I>. Using this criterion, we explicitly construct an infinite family of the maximal real cyclotomic function fields whose divisor class numbers are divisible by <I>ℓ</I>.</P>

FUNDAMENTAL UNITS AND REGULATORS OF AN INFINITE FAMILY OF CYCLIC QUARTIC FUNCTION FIELDS

Lee, Jungyun,Lee, Yoonjin Korean Mathematical Society 2017 대한수학회지 Vol.54 No.2

We explicitly determine fundamental units and regulators of an infinite family of cyclic quartic function fields $L_h$ of unit rank 3 with a parameter h in a polynomial ring $\mathbb{F}_q[t]$, where $\mathbb{F}_q$ is the finite field of order q with characteristic not equal to 2. This result resolves the second part of Lehmer's project for the function field case.