청소년의 스마트폰용 자녀안심 앱의 사용경험에 관한 연구

정한별 ( Jung Han Byul ),문성호 ( Moon Sung Ho ) 한국청소년학회 2023 청소년학연구 Vol.30 No.2

본 연구의 목적은 우리나라 청소년들의 자녀안심 앱 사용경험을 내러티브 탐구를 통해 심층적으로 이해하고, 이를 바탕으로 수요자 관점에서 향후 정책 및 실천적 함의를 제시하는 것이다. 연구목적을 달성하기 위해 1년 이상 자녀안심 앱을 사용한 경험이 있는 남자 청소년 5명을 대상으로 심층면접을 진행하였다. 질적 자료를 분석한 결과, 총 3개의 대주제와 11개의 소주제가 도출되었다. 주요 결과를 살펴보면, 청소년들은 자녀안심 앱을 통해 스마트폰 사용을 조절할 수 있었으며, 학업과 새로운 취미에 관심을 갖게 되었다. 하지만, 앱의 강제성 때문에 청소년들은 부정적인 감정과 높은 스트레스를 느꼈으며, 친구나 부모와의 관계가 악화되었다. 일부 기능은 사생활과 비밀보장의 권리를 침해하였고, 참여자들은 이를 부당하다고 여겼다. 이들은 자녀안심 앱 설치는 단점이 많고 뚜렷한 효과가 없다고 평가하면서, 청소년 스스로 조절하는 의지를 기를 수 있도록 정책 및 실천의 변화를 강조하였다. 또한, 청소년은 미성숙하다는 사회의 인식도 변화되기를 희망하였다. 마지막으로 이러한 연구결과를 반영하여 자녀안심 앱의 실용성 확보, 일부 기능의 조정, 그리고 역량 중심의 청소년보호정책으로의 전환을 제안하였다. The purpose of this study was to understand in-depth the experience of adolescents using Parental Control apps through narrative exploration, and to suggest future implications. To achieve these purposes, interviews were conducted with five male teenagers who had used the app for more than a year. As a result, 3 major topics and 11 sub-topics were derived. According to the results, adolescents were able to control their smartphone use through the app and became interested in their studies and new hobbies. However, due to the forcing nature of the app, teenagers felt negative emotions and high levels of stress, and their relationship with friends and parents were deteriorated. Some of the functions violated the right to privacy and confidentiality, and participants considered it unfair. In the evaluation of the app, participants explained that the app has many disadvantages and has no clear effect. They emphasized changes in policy and practice so that teenagers can develop a willingness to control their smartphone use by themselves. Also, It was hoped that society's perception that adolescents are immature would change. Finally, reflecting these research results, it was proposed to assure the practicality of the app, adjust some functions, and convert the basis of youth protection policies to competency-oriented.

흡수정의 유동해석

정한별(Han-Byul Jung ),노승희(Seung-Hee Noh) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.3

흡수정은 댐이나 저수지에 저장된 물을 흡입하여 사용하는 설비이다. 흡입한 다량의 물은 화력 및 원자력 등의 대형발전소의 냉각시스템에 사용된다. 특징으로 흡입 유량과 흡수정의 비가 작으면 흡입구 주변에서 유속이 증가한다. 이로 인해 와류나 선회류의 불균형 유동이 발생된다. 불균형 유동은 흡수정의 성능을 저하나 고장의 원인이 된다. 해결하기 위한 다양한 방법이 고안되고 있으나 최저수위 일 경우 정확한 해결 방법을 찾지 못하고 있다. 가장 효율적인 해결방법으로는 AVD를 설치하거나 관로를 길게하는 방법이 있다. 이렇게 설치된 구조물이 유동의 흐름을 균일하게 만들어 주기 때문이다. 본 논문에서는 관로의 길이와 AVD의 형태 변화에 따른 흡수정 내의 유동특성을 수치해석으로 분석한다. 수치해석을 위하여 수정의 흡입부, 섬프, 펌프의 3단계로 분리하여 모델링하였다. 격자는 해석의 정확도를 위해 흡입부는 비조밀, 흡수정과 AVD는 조밀하게 하였다. ANSYS ICEM-CFD 14.5를 이용하여 120~150만개의 격자를 생성하였고 Tetra grid와 Prism grid를 혼용하였다. 해석을 위해 상용 CFD 프로그램인 ANSYS CFX14.5의 SST 난류모델을 선정하였다. 조건으로 H.W.L 6.0m, L.W.L 3.5, Qmax 4.000 kg/s, Qavg 3.500 kg/s Qmin 2.500 kg/s로 설정하였다. 보텍스 각도와 속도분포로 해석한 결과는 다음과 같다. Ext E-type의 AVD를 설치한 흡수정이 최고수위 일때 합격하였다. 추후, Ext E-type을 기본으로 하여 최저수위일 때 만족하는 연구가 필요하다. sump pump is a system that draws in water that is stored in a dam or reservoir. They are used to pump large amounts of water for cooling systems in large power plants, such as thermal and nuclear plants. However, if the flow and sump pump ratio are small, the flow rate increases around the inlet port. This causes a turbulent vortex or swirl flows. The turbulent flow reduces the performance and can cause failure. Various methods have been devised to solve the problem, but a correct solution has not been found for low water level. The most efficient solution is to install an anti-vortex device (AVD) or increase the length of the sump inlet, which makes the flow uniform. This paper presents a computational fluid dynamics (CFD) analysis of the flow characteristics in a sump pump for different sump inlet lengths and AVD types. Modeling was performed in three stages based on the pump intake, sump, and pump. For accurate analysis, the grid was made denser in the intake part, and the grid for the sump pump and AVD were also dense. 1.2-1.5 million grid elements were generated using ANSYS ICEM-CFD 14.5 with a mixture of tetra and prism elements. The analysis was done using the SST turbulence model of ANSYS CFX14.5, a commercial CFD program. The conditions were as follows: H.W.L 6.0 m, L.W.L 3.5, Qmax 4.000 kg/s, Qavg 3.500 kg/s Qmin 2.500 kg/s. The results of analysis by the vertex angle and velocity distribution are as follows. A sump pump with an Ext E-type AVD was accepted at a high water level. However, further studies are needed for a low water level using the Ext E-type AVD as a base.

동적 모의실험 및 분석을 통한 보행훈련장치 연구

김한일 ( Han Il Kim ),정한별 ( Han Byul Jung ),김노형 ( Rho Hung Kim ),박길문 ( Gil Moon Park ),김근형 ( Geun Hyung Kim ),이행남 ( Hang Nam Lee ) 조선대학교 공학기술연구원 2009 공학기술논문지 Vol.2 No.1

A gait training system for patients with gait disorder was developed. These systems leads gait joint movements given the patient who cannot carry out an independent gait. It provided a normal stance-swing ratio of 60 : 40 because of the eccentricity revolution of a gear. In this study, motion trajectory of a knee & ankle joint was evaluated and compared a measured trajectory with three-dimensional motion analyses system with the results of multi-body dynamics simulation during the gait training in a prototype of a developed gait training system. In general, predictions from the simulation study were in good agreement with experimental results from the motion analysis. The clinical application by a continuous dynamics simulation studies and gait analysis was expected to be developed by gait training system which would be helpful to recover gait ability of patients with gait disorder.

차량용 머플러 테일 파이프 내부 유동특성에 따른 실험적 연구

오정교(Jung-kyo Oh),이행남(Haeng-Nam Lee),박길문(Gil-Moon Park),김노형(No-Hyung Kim),정한별(Han-Byul Jung) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5

As an interest regarding indoor chastity anger increases greatly nowadays in case of high-speed driving as basic design concept to be applied to all products the comfort result, with a lot of effort to floating interpretation demand and development inner an exhaust total. The case that the floating noise by disturbances of fluid occurs in case of high speed driving in case of mufflers used to a large sedan when the amount of flowing water of large quantity flows in the muffler inside exists. A case of the floating noise can return in triumph through detailed consideration regarding a floating chapter.

임상실습 내실화를 위한 일례 연구: 학생 경험 중심으로

최손환,정한별,Choi, Son-Hwan,Jung, Han-Byul 연세대학교 의과대학 2015 의학교육논단 Vol.17 No.3

This study evaluated the meaning of the clinical clerkship through in-depth interviews with students who had experienced a clinical clerkship. The clinical clerkship is one of the most important steps in the curriculum for becoming a doctor. While students perform actual clinical practice, the experience also reinforces a great deal of medical knowledge and competence as a reserve doctor. However, departments that operate inefficiently have caused some problems. Therefore, this study analyzed the data from interviews of 25 students who finished the clinical clerkship in terms of the meaning of the clinical clerkship, the attitude of the students toward work in clinical practice, the attitude of professors toward the clinical clerkship, benefits, and drawbacks. Comments are feedback from a student's experience in the clinical clerkship, and they may be an important resource illuminating the current status of clinical practice. This study also discusses how to run an effective clinical clerkship by checking in with students on the problems they face in clinical practice.

흡.배기 팬에 의한 Desktop Personal Computer 내부의 유동특성에 관한 연구

이행남,박길문,정한별,Lee, Haeng-Nam,Park, Gil-Moon,Jung, Han-Byul 한국마린엔지니어링학회 2007 한국마린엔지니어링학회지 Vol.31 No.6

The purpose of this study is to find out a flow characteristics required by the design of a computer case and to provide information about the preliminary data of cooling efficiency of CPU and a flow inside of a case. We examined a flow characteristic-suction a tracing particle occurred from a surge tand installed at an inlet into a computer case and moving it to a exit duct-experimentally by using PIV. The experimental device was consists of a fan inflowing and discharging the air into the computer case and a slot installed with a CPU cooling ran add-on, and analyzed the data of Re-stress distribution, velocity distribution, and kinetic energy distribution. This research will make a great contribution to improvement of the efficiency and performance of notebook, workstation, server, and all the design of electronic devices using large scale integrated(LSI) as well as usual computers.

Desktop Personal computer 內附의 流動特性에 관한 硏究

이행남(Haeng-Nam Lee),박길문(Gil-Moon Park),정한별(Han-Byul Jung) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-

This study speculates flowing at upper edge and slots of a case occurring by fans installed in different axises inside the PC case through PIV(Particle Image Velocimetry). Parasiticalphenomenon occurring inside the PC case decreases efficiency of discharge and causes noise. This study put a particle for tracing inside the case and then a camera recorded the field of flowing of mean time under proper lighting to analyse data on distributions of re-stress, velocity vector and kinetic energy. This study is expected to contribute to resolve many engineering problems such as cooling efficiency of CPU, parasitic phenomenon and noise occurring inside the PC case.

금속분말재료의 사출 성형해석에 관한 연구

노찬승(Chan-Seung Ro),박종남(Jong-Nam Park),정한별(Han-Byul Jung) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.10

본 연구는 광통신용 아답타의 필수품인 플랜지 개발을 위한 금속분말 사출성형해석에 관한 내용이다. 금속분말 사출성형법은 세라믹 또는 스테인레스 분말과 바인더를 혼합하여 복잡한 형상의 사출성형품을 제조하는 기술로써, 지금까지 가공기술로 제작이 복잡하거나 생산성이 저조한 제품들에 대한 생산을 대체 할 수 있는 기술로 관심을 받고 있다. 연구 목적은 기존의 기계가공을 통해 제작했던 제품에 대해 공정을 최소화하기 위함이다. 사출성형해석을 위해 먼저 스테인레스 계 STS316 금속분말과 바인더를 6대4 비율로 혼합하여 과립형 펠렛의 사출 성형재료를 완성하여 해결하였다. 이후, 3차원 모델링, 모델의 메시화 작업 등을 수행하여 최적의 사출성형 해석조건(금형 온도, 용융 온도, 사출 시간, 사출 온도, 사출 압력, 충진 시간 및 냉각 시간 등)을 도출하였다. 해석결과 성형품은 최초 사출 후 13.29초가 경과되면 취출이 가능하였다. 또한 용융수지는 스프루, 러너, 게이트를 거쳐 금형 내부까지 유동 및 충전이 안정적으로 진행되어 양호한 성형품의 제조가 기대되었다. In this study,we conducted an injection molding analysis of metal powder materials for the development of flanges, which are necessary adapters for optical communication. The metal powder injection molding process is a technique for producing an injection molded article having a complicated shape by mixing ceramic or stainless powder and binders. It is used to produce products which require complex processing technology or for which the productivity is low. The purpose of this study is to minimize the manufacturing processing of products which aremanufactured through existing mechanical processing procedures. For the injection molding analysis, we mixed stainless STS316 metal powder with binders at a ratio of 6 to 4 to make molding materials consisting of granular pellets. Then, three-dimensional modeling and meshing were carried out to obtain the optimal injection molding analysis conditions(molding temperature, melting temperature, injection time, injection temperature, injection pressure, packing time and cooling time). As a result of the analysis, it was discovered that the inlet became available 13.29 seconds after the first injection. Also, as the flowing and packing in the melt through the sprue, runner and gate were stable, it is expected that good molds canbe manufactured.

자동차용 시로코팬의 유동특성에 관한 연구

이행남,박길문,이덕구,정한별,김건일,설재림 朝鮮大學校 機械技術硏究所 2005 機械技術硏究 Vol.8 No.1

The sirocco fan is used to get low noise, and it has been applied to a lot of industry field like the heat engine, the fluid instrument power plant, the food industry, environment industry etc... because there are not problems even it is mixed with a any kind of liquid, gas, and solid. The flow characteristics in sirocco fan are investigated by PIV. The experiment using PIV measurement for Test section's flow characteristics acquired velocity distribution, Condition : when sirocco fan in automobile air controller maximum 1450RPM, and a revolution is a variation (l)950RPM, (2)l100RPM, (3) 1250RPM. The agreement a experiment shows the validity of this study and the results of this study would be useful to the engineers who design for the flow systems