디지털 CATV와 IPTV의 수신제한시스템 비교분석 및 발전방안 연구

박지언,신승중,유희경 한국인터넷방송통신학회 2008 한국인터넷방송통신학회 논문지 Vol.8 No.6

아날로그방송 중단을 앞두고 케이블방송은 디지털 CATV로 전환하기 위해 노력 중이다. 이를 위해 케이블방송은 단순히 방송의 디지털화 뿐만 아니라, PPV(Pay Per View), PVR(Personal Video Recorder), VOD(Video On Demand) 와 같은 서비스를 가입자에게 제공하기 시작했다. 이와 같은 서비스들은 대부분 유료서비스로 가입자의 수신권한을 확인하기 위해 다양한 종류의 CAS(Conditional Access System)를 사용하고 있다. 2008년 관련법의 정비와 함께 IPTV(Internet Protocol TV) 시범서비스가 시작 되었는데, IPTV 역시 실시간 방송, VOD 서비스를 기본 서비스로 규정하고 있기 때문에 CAS의 사용이 필수적이다. 본 논문에서는 디지털 CATV와 IPTV에서 사용하는 수신제한시스템을 분석하고, 가입자와 방송사업자 모두에게 도움이 되는 발전방향이 무엇인지 제시하고자 한다.

헬스참여자의 완벽주의 성향과 셀프리더십 및 운동가치인식의 관계

박지언,김민성 한국체육과학회 2022 한국체육과학회지 Vol.31 No.6

The purpose of this study was to examine the relationship between the perfectionist tendencies and self-leadership and exercise value perceptions of health participants, and what kind of changes there were in the health participants' perfectionism tendencies, self-leadership and exercise value perceptions, and what kind of influence there were between variables. In order to achieve this research purpose, in this study, 314 adult males and females participating in a health club in Busan were selected as a sample using a convenient sampling method. The questionnaire data were used as the final valid sample. The collected data were subjected to exploratory factor analysis and reliability analysis to find out the validity and reliability of the questionnaire using the SPSS 25.0 statistical program. Frequency analysis, independent t-test, and one-way analysis of variance were performed to examine the difference between variables, and multiple regression analysis was performed to verify the relationship between variables. The results are as follows. First, there were partially significant differences in perfectionism, self- leadership, and exercise value perception according to demographic characteristics. Second, the perfectionist tendencies of health participants were found to have a partially positive effect on self- leadership and exercise value perception, and self-leadership was found to have a partially positive effect on exercise value perception. Based on these results, it was possible to confirm the effectiveness of the fitness participants' perfectionism tendency, and it will be possible to rethink the positive direction of the perfectionism tendency.

청소년의 불안정 애착과 문제행동: 공감능력의 조절역할

박지언,이은희 한국상담심리학회 2008 한국심리학회지 상담 및 심리치료 Vol.20 No.2

This study examined the relationships between adolescents' insecure attachments, empathic ability and problem behaviors. It also explored the moderating effect of empathic ability on problem behaviors. A questionnaire was administered to 846 high school students from six high schools in Masan and Changwon, Attachment anxiety had an influences on internalized problem behaviors to a greater degree than attachment avoidance. Even when controlling the influence on insecure attachment, empathic ability had a number of negative influences on internalized problem behaviors. However, it had a number of positive influences on externalized problem behaviors. Empathic ability moderated the relationship between attachment anxiety and juvenile delinquency in a positive manner. In conclusion, this study may have a significant impact in that it to a great extent proves that empathic ability plays an important role as a protective factor in reducing juvenile delinquency. 본 연구에서는 청소년의 불안정 애착 중 어떤 유형의 애착이 문제행동(우울/불안, 비행, 공격성)에 더 많은 영향을 미치는지를 확인하고, 이들과 문제행동(우울/불안, 비행, 공격성)과의 관계에서 공감능력이 조절역할을 하는지를 알아보고자 하였다. 이를 위하여 경남 창원 및 마산시 소재 6개 학교 28개 학급 남녀 고등학교 학생 842명을 대상으로 설문조사를 실시하였다. 주요한 결과는 다음과 같다. 첫째, 청소년의 애착불안과 애착회피가 우울/불안 수준에 정적인 영향을 미치며, 애착불안이 애착회피보다 이들의 우울/불안 수준에 더 영향을 미치는 것으로 나타났다. 둘째, 불안정 애착(애착불안, 애착회피)의 영향력을 통제한 후에도 공감능력이 청소년의 우울/불안 수준에 정적인 영향을 미치고, 비행 수준에 부적인 영향을 미치는 것으로 나타났다. 셋째, 애착불안과 비행과의 관계에서 공감능력의 조절효과가 나타났다. 본 연구는 불안정 애착이 청소년 문제행동의 위험요인으로, 공감능력이 청소년 비행의 보호요인으로 작용할 수 있음을 확인하였으며, 애착불안이 청소년 비행에 미치는 부정적 영향을 억제시킬 수 있는 보호적 기능이 공감능력에 있음을 밝혔다는 점에서 연구의 의의가 있다.

A Study on the Boss Forming Process of AZ31 Mg Alloy Sheet

박지언,장영원,김형래,안상호 대한금속·재료학회 2009 METALS AND MATERIALS International Vol.15 No.3

A series of boss forming tests has been carried out using an AZ31 Mg alloy sheet at 250 °C, 300 °C, and 350 °C with various lubrication conditions to obtain optimum process conditions. The Mg alloy sheet had a homogeneous distribution of very fine sized grains. Surface defects generated during boss forming process could be reduced by changing the friction conditions, as prescribed by FEM analysis using the DEFORM 2D program. The modified boss forming process, lubricating only on the front side, was found to be successful in manufacturing the boss without defects. A series of boss forming tests has been carried out using an AZ31 Mg alloy sheet at 250 °C, 300 °C, and 350 °C with various lubrication conditions to obtain optimum process conditions. The Mg alloy sheet had a homogeneous distribution of very fine sized grains. Surface defects generated during boss forming process could be reduced by changing the friction conditions, as prescribed by FEM analysis using the DEFORM 2D program. The modified boss forming process, lubricating only on the front side, was found to be successful in manufacturing the boss without defects.

암환자의 마약성 진통제 유발성 변비에 대한 예방적 완하제 사용 및 복약순응도 평가

박지언,변정인,정선회,손인자,이혜숙 한국병원약사회 2011 병원약사회지 Vol.28 No.2

Constipation is the most common adverse effect occurring with chronic opioid use. Constipation resulting from opioids is dose-related, and patients do not develop tolerance to this symptom. Prophylaxis is crucial because opioid-induced constipation is much easier to prevent than to treat. This study was undertaken to estimate how often laxatives were started concurrently with opiates and to describe the compliance of laxatives and patient’s awareness about the side effect. We identified all outpatients who received a first prescription for oral opioid analgesics for a year from the the January 2007 in Cancer Center, Seoul National University Hospital. And we surveyed by telephone patients who received opioid analgesics more than 4 weeks through a questionnaire about medication compliance and patient’s awareness of the side effect for two months from the 16 August 2008. Overall, 45% of the patients received laxatives simultaneously with opioids. The 50 patients participated in the survey. 55% of patients for whom laxatives are prescribed took a laxative regularly. Of these patients 35% experienced opoioid-induced constipation. 45% of patients took a laxative irregularly, and of these patients 74% experienced constipation. The risk of developing constipation was significantly higher in irregularly taking laxative group [odds ratio 5.3(95% CI 1.4-19.9)]. The laxative compliance was higher with recognition of the reason for taking laxatives [odds ratio 3.9(95% CI 1.1-14.2)]. This study shows that prophylactic treatments are essential to minimize opioid-induced constipation. In addition, it is important to educate patients to raise their compliance and understanding of the reason for taking medication and necessity.

발효 장소와 복합 종균에 따른 막장의 품질 특성 변화

박지언,한명희,정우수,여수환,김소영 한국식품저장유통학회 2023 한국식품저장유통학회지 Vol.30 No.6

This study aimed to investigate the quality and microbial population changes for 90 days under two fermentation conditions, outdoors and indoors (35℃), with starters (single or mixed) in soybean paste. Bacillus velezensis NY12-2 (S1), Debaryomyces hansenii D5-P5 (S2), Enterococcus faecium N78-11 (S3), and their mixtures (M) were used for the makjang fermentation. The content of amino-type nitrogen among the makjang samples was highly shown in the indoors, followed by M, S3, and S2. The glutamic and aspartic acid contents in the M sample fermented in the indoors showed the highest values of 867.42±77.27 and 243.20±15.79 mg/g, respectively. By the electronic tongue analysis, the M sample fermented in the indoors exhibited lower saltiness and higher umami than the others. Consequently, we expect that using mixed strains, such as Bacillus, Debaryomyces, and Enterococcus, under constant conditions showed potential to the quality improvement of soy products.

페라이트계 스테인리스강의 R 값 변화에 대한 집합조직의 영향 분석 (초)

박지언,김상석,박수호 대한금속ㆍ재료학회 2009 대한금속재료학회 학술대회 개요집 Vol.2009 No.1

A Study on the Boss Forming Process of AZ31 Mg Alloy Sheet (초)

박지언,김형래,장영원 대한금속재료학회 ( 구 대한금속학회 ) 2008 대한금속재료학회 학술대회 개요집 Vol.2008 No.1

비례제어 기능을 결합한 퍼지 제어기의 응답특성에 관한 연구

李相府,林永道,朴志彦 東亞大學校 附設 情報通信硏究所 1993 情報通信硏究所論文誌 Vol.1 No.1

본 논문에서는 비례 제어기와 퍼지 제어기가 결합된 퍼지 제어기의 응답 특성에 관해서 연구고찰 하고자 한다. 퍼지 제어기는 비례 제어기에 비해 응답 속도가 느리고 목표치의 정밀 수렴에 있어서 다소 뒤떨어지나 초기치의 과도응답 특성이 우수하다. [9] 비례 제어기는 퍼지 제어기보다 정상상태의 오차는 적으나 초기의 과도응답 특성이 아주 불안정하다.[9] 그러므로 본 논문에서는 초기 과도모드에서는 퍼지 제어기를 동작시키고 정상상태에서는 비례 제어기를 동작시켜서 안정된 제어기의 응답특성을 얻고자 한다.

GPS수신기용 저잡음 증폭기의 설계 및 구현

박지언,진태훈,최희주,변건식 東亞大學校 附設 情報通信硏究所 1999 情報通信硏究所論文誌 Vol.7 No.1

This paper presents design of Low Noise Amplifier (LNA) that belongs to the front part of the RF receiver in the GPS satellite receiver. The LNA designed is implimeted to hardware and is to be improved matching, noise characteristic. Hybrid integrated Circuit that is composed of all and part of individual device was used, chip resistor and chip condenser was used for improvment fo intergrated degree, and 2-stage LNA used ATF-10136 fo package type offering at HP Company as active device was designed and made in this paper. Power gain and the gain of small signal was respectively obtained about 33dBm and 31dB in 1.575GHz. As a result fo this, gain was high, input VSWR and Output VSWR was 1.3 to 1 and 1 to 1.1 respectively, and was about 1 to 1 especially in narrow band. Noise figure obtained below 1.2dB was lower than desined value, but this value was satisfied to GPS specification sufficiently.