전자 영수증 시스템의 설계 및 구현

한경현(Kyung-Hyun Han),황성운(Seong Oun Hwang) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6

Due to recent rapid development of computer and data communications technology, many changes have occurred in the financial sector. One of these changes is smart wallet, with which we still use paper receipts. Paper receipts make users feel uncomfortable and further raise issues such as destruction of forest and degradation of environment. In order to solve these issues, in this paper, we propose a digital receipt system that issues digital receipts in place of paper receipts.

송전선로의 고장검출을 위한 Mother Wavelet 선정에 관한 연구

邊成鉉(Sung-Hyun Byun),金賢(Hyun-Kim),金喆煥(Chul-Hwan Kim),金一東(Il-Dong Kim),韓暻男(Kyung-Nam Han),蔡永茂(Young-Moo Chae) 대한전기학회 1998 전기학회논문지 Vol.47 No.9

분산 레인보우 테이블의 설계 및 구현

한경현(Kyung-Hyun Han),황성운(Seong Oun Hwang) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.11

Many people and companies have used passwords to protect sensitive information from attackers. Using hash functions, passwords are generally converted into hash values that are stored for security. However, since there is a case that needs to access the sensitive information (e.g., cyber investigation), we require a rainbow table. In this paper, we propose an effective distributive rainbow table using distributed system and dictionary data.

페이로드 추적 시스템의 설계 및 구현

한경현(Kyung-Hyun Han),황성운(Seong Oun Hwang) 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.6

조이스틱을 이용한 안전한 PIN 입력 시스템의 설계 및 구현

한경현(Kyung-Hyun Han),황성운(Seong Oun Hwang) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.6

Preferential Flow as Tested by Breakthrough Curves of Cl^- and Cu²⁺ from Saturated Undisturbed Soil Core Samples under Steady Flow Conditions

류순호,한경화,노희명,한광현,Yoo, Sun-Ho,Han, Kyung-Hwa,Ro, Hee-Myong,Han, Gwang-Hyun 한국토양비료학회 2000 한국토양비료학회지 Vol.33 No.2

사과 과수원 토양(송정통, the fine loamy, mesic family of Typic Hapludults)을 층위별로 채취하여 토양 수리적 특성과 누적공극분포를 조사하고 표토인 Ap1층과 점토집적층인 B1층에서 각각 토양코아시료 (지름 7.4 cm, 높이 7.4 cm)를 채취하여 포화조건에서 $Cl^-$와 $Cu^{2+}$로 혼성치환실험을 수행하고 그 출현곡선으로부터 선택류(選擇流)를 검증하고자 하였다. Ap1층과 B1층은 사질 식양토로 같은 토성이나 Ap1층의 포화수리전도도는 $2.0cmhr^{-1}$로 B1층($0.27cm hr^{-1}$)의 약 7배에 달하였다. C층은 포화수리전도도 $5.2cmhr^{-1}$인 구조가 없는 사양토로 물과 용질의 이동을 제한하는 역할이 가장 낮을 것으로 판단되었다. 누적 공극분포에서 Ap1층과 B1층의 대공극량(토양수분포텐셜 - 6 kpa에 해당하는 지름 $49{\mu}m$ 이상의 공극)은 각각 총 공극량의 24%, B1층은 14%이었다. 염소출현곡선에서 Ap1층 코아와 B1층 코아의 수력학적 분산계수는 각각 $34cm^2hr^{-1}$, $1.3cm^2hr^{-1}$이었고 이때 B1층 코아의 지연계수는 1인 반면 Ap1층 코아는 0.6으로 부동수분과 유동수분의 분배가 일어났다. 양이온 치환용량이 Ap1층이 B1층보다 높음에도 불구하고 Ap1층 코아의 구리지연효과가 B1층보다 더 작게 나타났다. 이 결과는 포화수리전도도와 대공극 함량이 큰 Ap1층에서 선택류(選擇流)가 일어날 수 가능성을 보여 주었다. 그러나 투수성이 좋은 모재층을 가진 이 토양단면에서 Ap1층에서 선택류(選擇流)가 일어난다 하더라도 B1층에 의해 제한될 것으로 사료된다. Preferential flow has recently been the subject of increasing interest because these phenomena contribute to solute transport in soils. Commonly, preferential flow paths are associated with macropores or highly structured soils. We presented an analysis of the measured breakthrough curves (BTCs) of $Cl^-$ and $Cu^{2+}$ ions to test the occurrence of preferential flow in soils using miscible displacement technique under steady flow conditions. We also analyzed soil water retention curves and from this curves induced cumulative pore size distribution of undisturbed soils, which sampled from Ap1, B1, and C horizons of Songjeong series soils (the fine loamy, mesic family of Typic Hapludults). In this study, miscible displacement experiment on C horizon was excluded, because it is structureless sandy loam with saturated hydraulic conductivity of $5.2cmhr^{-1}$. The saturated hydraulic conductivity of Ap1 horizon was $2.0cmhr^{-1}$, which was about 7 times higher than that of B1 horizon ($0.27cm hr^{-1}$). Cumulative pore size distribution predicted that Ap1 horizon had more macropores (pore diameter larger than $49{\mu}m$, equivalent to -6 kpa of soil matric potential) than B1 horizon. The hydrodynamic dispersion coefficient from chloride BTCs was estimated as $1.3cm^2hr^{-1}$ for B1 and $34cm^2hr^{-1}$ for Ap1 horizon. However the retardation factors of B1 and Ap1 horizon were significantly different, i.e. 1 and 0.6, respectively, which means that there was distinct partition between mobile water and immobile phase in Ap1 horizon. The copper retardation effect of Ap1 horizon was less than that of B1 horizon, even though cation exchange capacity of Ap1 horizon was higher than that of B1 horizon. Thus, breakthrough curves of $Cl^-$ and $Cu^{2+}$ obviously showed the probability that preferential flow would occur in Ap1 horizon.

코딩 교육을 위한 그래픽 기반의 게임 제작 도구 개발

박현식(Hyun Sik Park),박민우(Min Woo Park),나정일(Jeong Il Na),한경현(Kyung-Hyun Han),황성운(Seong Oun Hwang) 대한전자공학회 2019 대한전자공학회 학술대회 Vol.2019 No.11

Research on changes in social perceptions of games, software education, and coding education is being actively conducted. One of the most important things in the education of young students is how to draw their attentions. Games are powerful tools to draw their interests, and we suggest a simple and easy way to create a game.

외래 및 퇴원환아 부모의 전화상담요구와 간호중재에 대한 조사연구

강화자,한경자,최명애,박승현,김영미,권원경,김선구,안혜영,허미영,Kang Hwa Ja,Han Kyung Ja,Choe Myoung Ae,Park Seung Hyun,Kim Young Mi,Kwon Won Kyoung,Kim Sun Gu,Ahn Hye Young,Heo Mi Young 한국아동간호학회 1996 Child Health Nursing Research Vol.2 No.1

The purpose of this study was to investigate the current status of the need of telephone call and to identify the status of nursing intervention through telephone. Head nurses of the pediatric nursing unit and a nurse of pediatric outpatient clinic wrote down the telephone record of calls by parents of children discharged from hospital from 7 am to 3 pm during the period of March to June, 1995. Content of 120 telephone calls but for 26 calls with incomplete record among 146 calls were analyzed into frequency of general characteristics, needs and nursing intervention. The needs of telephone call were identified and classified into 11 areas and analyzed into frequency of detailed content by 11 areas. Nursing intervention was identified and classified into 10 categories, and analyzed into frequency of detailed content by 10 categories. The findings of this study were as follows ; The need of telephone call was identified with nutritional state, medication, vital signs, language retardation, personal hygiene, vaccination, administration procedure, physical symptoms, follow up care management and others. The most frequent needs were physical symptoms and vaccination. A kind of food among nutrition dose of drugs among medication, fever among vital signs, cough among physical symptoms, and content of vaccination among vaccination was the most frequent needs. Nursing intervention through telephone was identified with instruction, knowledge offer, information offer, judgement, solicitation, referral and instruction, referral, connection, reassurance, reservation, and regulation. Instruction, knowledge offer and information offer was the most frequent nursing intervention by telephone call. Instruction was about a visit to hospital, a visit to nearby clinic, instruction about symptoms,, instruction about nursing care procedure, retelephoning and vaccination. Knowledge offer was about vaccination, knowledge related to medication, and dental care. Information offer and judgement was about vaccination and medication. Referral and instruction delivery was about instruction delivery following consultation to doctor, visit to emergency room and a visit to hospital following consultation to doctor. These results suggest that telephone call intervention program should be established as a field of extended pediatric nursing role in health care delivery system for the children.

가정 외 보호 경계선 지적기능 아동 대상 자립지원프로그램 관련 연구

김현주 ( Kim Hyun-ju ),한경임 ( Han Kyung-im ),장지현 ( Jang Ji-hyun ) 한국청소년학회 2022 청소년학연구 Vol.29 No.11

The purpose of this study was to analyze the awareness and the difference between the importance and performance of independent living program for children with borderline intellectual functioning from out-of-home care. The subjects of the investigation are workers. This study examined the independent living programs that require concentration for the successful independence of borderline intellectually functioning children. In February 2021, a survey was conducted through for workers in childcare facilities and in communal families in Gyeongsangnamdo. A total of 151 questionnaires were used as analysis data. Descriptive statistics, t-test, and IPA analysis were performed using the SPSS for Windows 25.0 program. As a result, there was a statistically significant difference in the importance and performance of the independent living program for borderline intellectual functioning children from out-of-home care. Compared to the importance, the perception of performance was low in all areas. As a result of deriving the priority of programs that require intensive effort through IPA analysis, it was found that it is necessary to intensively support self-reliance support programs related to social skills, workplace life skills, and self-protection. According to the results of this study, the direction of the program for self-reliance of borderline intellectually functioning children and a program for preparing the foundation for self-reliance were suggested.

Calculation of Bulk and Solution Electrical Conductivity of Soil Using Time Domain Reflectometry Measurements

배병술,최우정,한광현,한경화,류순호,노희명,Bae, Byung-Sul,Choi, Woo-Jung,Han, Gwang-Hyun,Han, Kyung-Hwa,Yoo, Sun-Ho,Ro, Hee-Myong Korean Society of Soil Science and Fertilizer 2003 한국토양비료학회지 Vol.36 No.1

Time domain reflectometry (TDR) is a newly developed method for measuring simultaneously solute concentrations and volumetric water content of soil. Bulk electrical conductivity ($EC_a$) of soil is obtained from TDR signal using several equations proposed, and electrical conductivity of soil solution ($EC_w$) can be calculated using the linear relationship $EC_a=EC_w\theta(a\theta+b)+EC_s$ between $EC_a$ and $EC_w$ at constant soil water content. The objectives of this study were to evaluate $EC_a$ proposed by several workers and to obtain the empirical constants (a, b, and $EC_s$) for $EC_w$ of the soils from A, Bl, and B2 horizon of an agricultural field (Coarse loamy, Fluvaquentic Eutrudepts). The $EC_a$ proposed by Yanuka et al. responded most sensitively to the KCl solute concentrations. The empirical constants of a, b, and $EC_s$ for $EC_w$ were -0.249, 1.358, and 0.054 for A horizon, -2.518, 2.708, and 0.097 for Bl horizon, and 2.490, -0.250, and 0.103 for B2 horizon, respectively. Therefore, the results of this study showed that Yanuka et al. equation was most useful one in determining $EC_a$, from TDR signal for agricultural soil with low salinity and that the empirical constants for the calculation of $EC_w$, from $EC_a$ can be obtained through a simple calibration experiment. Time Domain Reflectometry(TDR)은 토양의 순분함량과 전기전도도를 측정할 수 있는 비파괴적인 방법이다. 초기 전자파에 대한 TDR 반향파의 감쇄정도를 이용하여 토양의 총전기전도도($EC_a$)를 직접 계산할 수 있는 다양한 식들이 제안된 바 있다. 또한, $EC_a$로부터 보다 실질적인 의미가 있는 토양 용액의 전기전도도($EC_w$)를 계산하기 위해서는 일정 토양 수분 함량에서 $EC_a$와 $EC_w$가 갖는 직선관계식[$EC_a=EC_w{\theta}(a{\theta}+b)+EC_s$]이 이용된다. 따라서 본 연구에서는 TDR 신호를 이용하여 $EC_a$를 계산할 수 있는 다양한 식을 비교하여 가장 적합한 식을 제안하고, 농경지 토양(강서통, A, B1, B2 층위)을 대상으로 $EC_a$로부터 $EC_w를 계산할 때 필요한 실험상수(a, b, $EC_s$)를 구하고자 하였다. $EC_a$는 KCl 농도가 증가함에 따라 직선적으로 증가하였고, 특히 Yanuka 등이 제안한 식으로 계산한 $EC_a$가 용질 농도에 가장 민감하게 반응하였다. 직선회귀식을 이용하여 $EC_a$와 $EC_w$의 상관관계식의 실험 상수 (a, b, $EC_s$)를 구한 결과, 각각 -0.249, 1.358, 0.054(A층), -2.518, 2.708, 0.097(B1층), 2.490, -0.250, 0.103 (B2층)으로 조사되었다. 따라서 이상의 연구 결과는 TDR 신호를 이용해서 염농도가 낮은 일반 농경지 토양의 $EC_a$를 계산할 때 Yanuka 등이 제안한 식을 적용하는 것이 바람직하며, $EC_w$를 계산할 때 이용되는 $EC_w$-$EC_a$ 상관관계식의 상수는 간단한 실험실내 보정 시험을 통해 구할 수 있음을 보여준다.