기계적 합금화 및 in-situ와 ex-situ의 혼합공정을 통한 C 도핑된 ex-situ $MgB_2$ 선재 제조

황수민,이창민,임준형,최준혁,박진현,주진호,전병혁,김찬중,Hwang, Soo-Min,Lee, Chang-Min,Lim, Jun-Hyung,Choi, Jun-Hyuk,Park, Jin-Hyun,Joo, Jin-Ho,Jun, Byung-Hyuk,Kim, Chan-Joong 한국초전도학회 2009 Progress in superconductivity Vol.10 No.2

We successfully fabricated C-doped ex-situ $MgB_2$ wires using two different methods such as mechanical alloying(MA) and combined process(CP) of in-situ and ex-situ. In the MA, the precursor powder was prepared with a mixture of $MgB_2$ and 1 at% C powders by planetary ball milling for 0-100 h. In the CP, on the other hand, C-doped $MgB_2$ powder was prepared with Mg, B, and C powders by in-situ process via compaction, sintering, and crushing. The powders prepared by two methods were loaded into Fe tube and then the assemblages were drawn by a conventional powder-in-tube technique. The MA treatment of C-added $MgB_2$ decreased the particles/grains size and resulted in C-doping into $MgB_2$ after sintering, improving the critical current density($J_c$) in high external magnetic field. For the C-doped $MgB_2$ wire by MA for 25 h, the $J_c$ was $4.1{\times}10^3A/cm^2$ at 5 K and 6.4 T, which was 5.9 times higher than that of pure and untreated $MgB_2$ wire. The CP also provided C-doping into $MgB_2$ and improved the $J_c$ in high magnetic field; the C-doped $MgB_2$ wire fabricated by CP exhibited a $J_c$ being 2.3 times higher than that of the ex-situ wire used commercial $MgB_2$ powder at 5 K and 6.0 T($2.7{\times}10^3A/cm^2\;vs.\;1.2{\times}10^3A/cm^2$).

Effect of Tianeptine on Depressed Tinnitus Patients

황수민,임세희,오동주,김성균,정학현,임기정 대한청각학회 2016 Journal of Audiology & Otology Vol.20 No.2

Background and Objectives: Tianeptine is a tricyclic antidepressant that has a novel pharmacological property: it increases the reuptake of 5-hydroxytryptamine. Recent studies have reported that the prevalence of depression is greater in patients with tinnitus than in control subjects who do not have tinnitus. The purpose of this study was to assess the efficacy of tianeptine for the relief of tinnitus, especially in patients with depressive mood. Subjects and Methods: Among a total of 52 tinnitus patients, 15 had depressive mood. The depressed tinnitus patients were prescribed Stablon® 12.5 mg once daily for 1 month without any other drug. We assessed the severity of tinnitus, level of depression, and the quality of sleep in these patients by using the Tinnitus Handicap Inventory (THI), Beck Depression Inventory (BDI), and Pittsburgh Sleep Quality Index (PSQI). Hearing impairment and severity of tinnitus were measured with pure tone audiometry, speech audiometry, and tinnitograms. These evaluations were conducted before and after medication treatment. Results: For the 15 depressed tinnitus patients, THI scores significantly correlated with BDI and PSQI scores prior to medication treatment. These results showed that the discomfort of tinnitus was closely related to depression and sleep disorder. After medication treatment, THI and BDI scores significantly decreased, indicating that tinnitus and depression improved. However, no significant alteration in PSQI score was observed, indicating that there was no improvement in sleep quality. Conclusions: In the treatment of depressed tinnitus patients, tianeptine might be an efficient drug to treat both tinnitus and depression. However, tianeptine is unlikely to improve the quality of sleep in these patients.

Identification of Counterfeit Android Malware Apps using Hyperledger Fabric Blockchain

황수민,이형우 한국인터넷정보학회 2019 인터넷정보학회논문지 Vol.20 No.2

Although the number of smartphone users is continuously increasing due to the advantage of being able to easily use most of the Internet services, the number of counterfeit applications is rapidly increasing and personal information stored in the smartphone is leaked to the outside. Because Android app was developed with Java language, it is relatively easy to create counterfeit apps if attacker performs the de-compilation process to reverse app by abusing the repackaging vulnerability. Although an obfuscation technique can be applied to prevent this, but most mobile apps are not adopted. Therefore, it is fundamentally impossible to block repackaging attacks on Android mobile apps. In addition, personal information stored in the smartphone is leaked outside because it does not provide a forgery self-verification procedure on installing an app in smartphone. In order to solve this problem, blockchain is used to implement a process of certificated application registration and a fake app identification and detection mechanism is proposed on Hyperledger Fabric framework.

김정은 시대 ‘북한식’ 금융개혁에 관한 연구

황수민,양문수 세종연구소 2020 국가전략 Vol.26 No.1

본 연구의 목적은 김정은 시대 실시된 금융개혁을 분석하는 데 있다. 북한의 금융개혁은 재정개혁, 기관·기업소 개혁, 지방 분권화 등을 포괄하고 뒷받침하는 ‘북한식’ 개혁이라는 특징을 갖는다. 이를 분석하기 위해 김정은 집권 이후 제·개정된 관련 법률과 북한의 공식문헌을 활용하였다. 보완적으로 실제 제도의 작동양태를 확인하기 위해 탈북자 인터뷰를 시도했다. 김정은 시대 금융개혁은 화폐순환구조의 회복과 사금융 제도 내 편입, 지방의 자력갱생 이라는 기대효과를 갖는다. 이를 통해 북한 당국은 제재가 강화되는 대외요건 속에서 효율적으로 국내 자금을 동원할 수 있으며, 중앙정부의 재정부담을 경감시킬 수 있다. 이 연구는 김정은 시대 금융개혁을 종합적으로 분석하고 실제 금융개혁의 효과를 분석하는데 시사점을 제공할 수 있다. The purpose of this study is to analyze financial reforms carried out during the Kim Jong-Un era. North Korea’s financial reforms are characterized by “North Korean style” reforms that encompass fiscal reforms, enterprises reforms and governance decentralization. For the analysis, official documents related to relevant laws that have been enacted and revised since Kim Jong-Un took power were reviewed. In addition, interviews with North Korean defectors were conducted to see how the actual system works and complement the analysis. Financial reforms during the Kim Jong-Un era have the expectancy effects of recovery of the currency cycle, integration of the private financial system into the public financial system and self-reliance of local districts. This allows the North Korean authorities to mobilize domestic funds efficiently and ease the central government's financial burden amid toughened external sanctions. The study can provide implications for comprehensively analyzing financial reforms in the Kim Jong-un era and analyzing the effects of actual financial reforms.

In-situ $MgB_2$ 선재의 소결온도와 SiC 함량에 따른 미세조직 및 초전도 특성 연구

황수민,박의철,박시홍,장석헌,김규태,임준형,주진호,강원남,김찬중,Hwang, Soo-Min,Park, Eui-Cheol,Park, Si-Hong,Jang, Seok-Hern,Kim, Kyu-Tae,Lim, Jun-Hyung,Joo, Jin-Ho,Kang, Won-Nam,Kim, Chan-Joong 한국초전도학회 2007 Progress in superconductivity Vol.9 No.1

We fabricated the in-situ $MgB_2$ wires using the powder-in-tube method and investigated the effects of sintering temperature and SiC contents on the microstructure and superconducting properties. Pure $MgB_2$ wires and 5, 10, 20 wt.% SiC doped $MgB_2$ wires were sintered at $600-1000^{\circ}C$ for 30 minutes in Ar atmosphere. We found that $MgB_2$ phase was mostly formed at the sintering temperature of $700^{\circ}C$ and above, and the critical temperature ($T_c$) increased with increasing sintering temperature. For the $MgB_2$ sintered at $850^{\circ}C$, the highest critical current density ($J_c$) was obtained to be $3.7{\times}10^5\;A/cm^2$ at 5 K and 1.6 T by a magnetic properties measurement system (MPMS). The addition of SiC to the $MgB_2$ wires changed microstructure and critical properties. SEM observation showed that the $MgB_2$ core had considerable micro-cracks in undoped wire and the density of micro-cracks decreased with increasing SiC contents. The critical temperature decreased as the SiC contents increased, on the other hand, the critical current density of SiC doped $MgB_2$ wires in high magnetic field was enhanced compared to that of undoped $MgB_2$ wires.

LC-HRMS 이용한 화포천 내 미량오염물질 정량분석 및 위해성 평가

황수민,전준호 환경독성보건학회 2019 한국독성학회 심포지움 및 학술발표회 Vol.2019 No.10

열처리 및 분쇄 방법이 전복 분말의 특성에 미치는 영향

황수민,안지훈,황영민,구혜림,권효진,윤귀애,박기환,이동언 한국산업식품공학회 2022 학술대회 및 심포지엄 Vol.2022 No.11

고등학생을 위한 ChatGPT 활용 면접 교육 프로그램 개발 및 효과성 검증

황수민,손예지,이예은,이정민 한국청소년학회 2024 청소년학연구 Vol.31 No.5

본 연구는 고등학생들을 대상으로 ChatGPT를 활용하여 면접 교육 프로그램을 체계적으로 설계 및 적용하여 효과를 분석하는 것을 목적으로 하였다. 이를 위해 전체 교육 프로그램은 ADDIE 모형에 따라 자원기반학습에 기반하여 ChatGPT를 활용한 프로그램으로 설계하였고, 해당 면접교육프로그램은 2023년 7월 3일부터 10월 6일 동안 매주 2-3시간씩 18차시에 걸쳐 총 40시간 진행되었다. 프로그램의 효과는 스피치 능력, 스피치 메타인지, AI 디지털 리터러시에 대한 사전-사후 검사를 실시하였으며, 대응표본 t-검정 결과 모두 통계쩍으로 유의하게 향상된 것으로 나타났다. 또한 학습자 인터뷰 결과, 학생들은 ChatGPT 활용 면접 준비 과정의 유용성 및 한계점을 인지하고 있었다. 본 연구는 고등학생을 위한 ChatGPT 활용 면접 교육 프로그램을 체계적으로 설계하고 적용하여 효과성을 검증하는 실증적인 연구를 수행하였다는 점에서 의의가 있다. The purpose of this study was to systematically design and apply an interview training program using ChatGPT for high school students and analyze its effectiveness. To this end, the entire training program was designed as a program using ChatGPT based on resource-based learning according to the ADDIE model, and the interview training program was conducted for a total of 40 hours for 18 sessions of 2-3 hours every week from July 3 to October 6, 2023. The effectiveness of the program was measured in pre- and post-test on speech ability, speech metacognition, and AI digital literacy, and the results of the corresponding sample test showed a statistically significant improvement, and the results of the interviews with the learners confirmed that the students were aware of the usefulness and limitations of the interview preparation process using ChatGPT. This study is significant in that it conducted an empirical study to systematically design and apply an interview training program using ChatGPT for high school students to verify its effectiveness.

LC-HRMS 기반의 표적, 추정 및 비표적 분석기법을 이용한 화포습지 내 미량오염물질 및 대사체 분석

황수민,전준호 한국환경분석학회 2018 환경분석과 독성보건 Vol.21 No.4

Located in Gimhae, Hwapo is the biggest riverine wetland in the province of Gyeongsangsam-do, Korea, and is a major habitat for various species. However, it is suspected that various pollutants enter the wetlands from agricultural and industrial areas. This study identifies major organic pollutants in this wetland and their sources using high performance liquid chromatography-high resolution mass spectrometry during one summer season. Forty-five substances were selected for quantitative analysis using target screening, and other non-selected compounds were screened using suspect and non-target screening methods. The results were that 21 and 17 targeted substances were detected in July and August, respectively. Major pollutants in July and August were oxadiazon (July: 17-220 ng/L, August: 66-460 ng/L), carbendazim (July: 10-110 ng/L, August: 64-520 ng/L), caffeine (July: 33-1,100 ng/L, August: 56-580 ng/L), and niflumic acid (July: 23-75 ng/L, August: 42-290 ng/ L). Sampling sites S4 in July and S2 in August were the major inflow points. Ten substances (tricyclazole, hexaconazole, diuron, fexofenadine, irbesartan, simetryn, cimetidine, valsartan, tebuconazole, and benzotriazole) and four metabolites (valsartan acid, azoxystrobin acid, TEB_M324c, and 2-aminobenzimidazole) were tentatively identified through suspect and non-target screening, respectively.

웰라 컬렉션에 나타난 헤어디자인 트렌드 분석연구2014년에서 2018년까지

황수민,김진숙,손진아 한국인체미용예술학회 2018 한국인체미용예술학회지 Vol.19 No.4

Entering the 21st century, new cultural trends have been formed after changes in social perception and the environment. Social psychologist Erich Seligmann Fromm proposed that ‘the ability to predict the future and express subjects and acts in diverse ideas’ is an attribute that makes humans different from animals. There are very diverse ways and views to predict trends and experts from individual fields can predict trends by studying related laws. These trends can be viewed as a phenomenon that expresses the emotions and personality that exist in people’s consciousness. In modern society, people want to create trendy and unique styles, using diverse elements and design factors by escaping from a conventional concept of beauty. Humans design and develop new tools that are both esthetic and functional through harmony between art and science. In fashion, art and cosmetology, trendy collections are suggested annually by predicting trends in advance. New and diverse trends that differ from past trends are always pursued. With the development of mass media, furthermore, trends have become a large issue around the globe. Hairstyling is closely related to trend so that there should be continued studies on new trends. Therefore, this study investigated hairstyle trends in the Wella Collection from 2014 to 2018. It analyzed these hairstyles by shape, texture and color, and the results are available as basic data for analyzing hair collections. It is hoped that they would be useful in predicting future trends.