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DRM 환경을 고려한 보안 통신 API의 설계 및 구현
정인성,신용태,Jung, In-Sung,Shin, Yong-Tae 한국정보처리학회 2004 정보처리학회논문지 C : 정보통신,정보보안 Vol.11 No.2
인터넷 환경에서 통신 개체간에 보안 통신을 설정하기 위한 부가적인 메커니즘이 필요하다. 통신 개체들은 데이터의 무결성을 보장하는 암호화/복호화, 보안 채널을 통한 데이터 송수신한다. 또한, 보안 통신 프로토콜을 통해 상호 인증이 지원되어야 한다. SSL/TLS는 통신 개체간의 안전한 통신 채널을 생성하여 데이터 송수신을 제공하는 프로토콜이다. TLS를 구현한 OpenSSL이 활발히 사용되고 안정성과 성능이 입증되었지만, 크기가 크며, 기존 암호 모들의 삭제 및 교체, 툴킷 형태의 사용에 어려움이 있다. 이에 본 논문은 암호 모둘 삭제 및 교체론 수정된 OpenSSL을 기반으로 개발자들이 쉽고 간편하게 사용할 수 있는 보안 통신 API를 설계, 구현하였다. 구현된 API를 사용하여 보안 통신을 지원하는 DRM 클라이언트/서버 사례를 통하여 실제 적용 결과를 확인한다. The additional mechanism Is required to set up a secure connection among the communication subjects in the internet environment. Each entity should transfer and receive the encrypted and hashed data to guarantee the data integrity. Also, the mutual authentication procedure should be processed using a secure communication protocol. The SSL/TLS is a protocol which creates the secure communication channel among the communication subjects and sends/receives a data. Although the OpenSSL which implements the TLS is using by many developers and its stability and performance are proved, it has a difficulty in using because of its large size. So, this Paper designs and implements the secure communication which the users can use easily by modification works of OpenSSL library API. We proved the real application results using the DRM client/server case which supports a secure communication using the implemented API.
아파트 가격에 대한 주거용 난방방식의 영향 분석 : 한국 인천광역시 계양구의 실증적 연구
정인성(In-Sung Jung),김준영(Jun-Young Kim),유승훈(Seung-Hoon Yoo) 한국혁신학회 2022 한국혁신학회지 Vol.17 No.2
본 연구는 주거용 난방방식이 아파트 가격에 미치는 영향을 실증적으로 분석하고 시사점을 도출하는 것을 목적으로 한다. 연구대상 지역은 개별난방, 중앙난방, 지역난방 방식이 혼재되어 있는 인천광역시 계양구로 선정되었고 해당 지역의 아파트 매물자료 1,213개를 활용하였다. 난방방식을 아파트에 내재된 속성으로 고려하여 아파트 가격 방정식을 추정하고 헤도닉 가격기법을 적용하였다. 아파트 가격 방정식의 함수 형태와 추정방법을 변화시켜 총 10개의 식을 추정하였다. 그 중 예측오차가 가장 작은 추정 결과에 따르면 지역난방 방식은 아파트 가격에 영향을 미치는 것으로 나타났다. 즉, 지역난방 방식이 적용된 아파트의 가격이 타 난방방식이 적용된 아파트보다 높은 것으로 나타났으며 유의수준 5%에서 통계적으로 유의하였다. 타 난방방식과 지역난방 방식이 적용된 아파트 가격의 차이는 계양구 평균 아파트 가격의 약 8.7%였다. 본 연구는 인천시 계양구만을 대상으로 수행되었기 때문에 연구 결과의 일반화에 주의할 필요가 있으나, 택지개발, 도심 재개발 및 재건축시 사전에 난방방식을 결정하는데 중요한 참고자료로 활용될 수 있다. The purpose of this study is to empirically investigate the effect of residential heating methods on apartment prices in an urban area in South Korea and to derive implications. For this purpose, 1,213 apartment sales data in Gyeyang-gu, Incheon, a large city in South Korea, Where individual heating, central heating, and district heating systems are mixed, were used. The apartment price equations were estimated by considering the heating method as an attribute inherent in the apartment, and the effect of each heating method on the apartment price was investigated using the hedonic price technique while other factors were kept constant. A total of 10 equations were estimated with different estimation methods. By finally selecting the equation with the smallest prediction error, it was made to select the optimal equation when the dependent variable is different. As a result, the apartment price equation was statistically significant, and the apartment price to which the district heating system was applied was significantly higher than others. The difference was statistically significant at the significance level of 5% and accounted for about 8.7% of the apartment price. It should be noted that this study was conducted for a specific area in South Korea, but it is important to note that heating method acts as an attribute inherent in the apartment, so that consumers prefer apartment with district heating systems over other heating systems. In addition, since the price premium of district heating apartment causes an increase in apartment prices that exceed the construction cost burden paid by district heating consumers at the time of moving in, the results of this study can be referred to in the process of determining heating methods for future redevelopment and reconstruction.
정상적(正常的)인 한우(韓牛)의 심전도(心電圖)에 관(關)한 연구(硏究) I. 표준지유도(標準肢誘導)
최인혁,정인성,김남수,서두석,Choi, In-hyuk,Jung, In-sung,Kim, Nam-soo,Suh, Doo-seok 대한수의학회 1993 大韓獸醫學會誌 Vol.33 No.4
The electrocardiographic(ECG) parameters on the standard limb leads in the normal Korean native cattle have been measured with a 3 channel Electrocardiograph built in a computed analysis. The study was conducted on the animals 98 heads of mean age of 17.7 months. Conduction parameters, waves, intervals and segments have been recorded. The recordings were analyzed as to shape and amplitude of the P and T waves and the components of the QRS complex. Heart rate was recorded by the Electrocardiogram which were a mean of $80.4{\pm}11.6beats/min$. And the younger had a higher heart rate than the older one. Average conduction times in the RP, the QRS complex and the QTc interval recorded $166.7{\pm}23.1msec.$, $79.7{\pm}8.8msec.$ and $395.5{\pm}30.4msec.$, in the P and T wave duration recorded $70.1{\pm}13.5msec.$ and $97.6{\pm}16.9msec.$, and in the PR and ST segment duration recorded $97.9{\pm}23.5msec.$ and $173.9{\pm}40.3msec.$, respectively. The wave forms in each lead observed various types. The amplitudes of wave type showed the highest frequency in each lead that were analyzed as follow : 1. In P wave, amplitudes of the positive type showed the frequency of 65.3%, 82.7% and 52.0% in leads I, II and III that were $103.1{\pm}47.8{\mu}V$, $115.2{\pm}37.3{\mu}V$ and $67.4{\pm}26.9{\mu}V$, and it showed the frequency of 54.1% and 85.7% in the leads aVL and aVF that were $63.7{\pm}23.0{\mu}V$, $88.0{\pm}83.6{\mu}V$, respectively. Average amplitude of the negative type showed the frequency of 78.6% in lead aVR which was $99.3{\pm}38.0{\mu}V$. 2. Average amplitude of the QRS complex were from $362.8{\pm}177.7{\mu}V$ to $532.8{\pm}253.9{\mu}V$(mean of $449.1{\pm}57.2{\mu}V$) that in all leads except lead I were manifested the Low-Voltage QRS complex(below 0.5mV). Average amplitudes of each wave type in the QRS complex aere $-50.2.4{\pm}258.2{\mu}V$ and $-428.6{\pm}195.1{\mu}V$ in the QS groups type that showed a frequency of 66.3%, 70.4% in the leads I and aVL, were $451.1{\pm}20.4.0{\mu}V$, $387.6{\pm}175.8{\mu}V$ and $299.3{\pm}146.5{\mu}V$ in the R groups type that showed a frequency of 48.0%, 53.1% and 34.7% in the leads III, aVR and aVF, and were $-307.5{\pm}180.3{\mu}V$, $201.4{\pm}77.2{\mu}V$ in the QR wave type which showed a frequency of 39.8% in lead II, respectively. 3. In T wave, amplitude of the positive type showed the frequency of 50.0%, 82.7%, 51.0% and 57.1% in leads II, III aVR and aVF which were $214.9{\pm}115.6{\mu}V$, $188.5{\pm}119.3{\mu}V$, $191.0{\pm}93.7{\mu}V$ and $165.7{\pm}91.9{\mu}V$, and the negative type showed a frequecny of 66.3% and 72.5% in leads I and aVL. that were $221.3{\pm}112.5{\mu}V$, $-173.6{\pm}86.7{\mu}V$, respectively. 4. Amplitude of ST segment in leads I, II and III were a mean of $-12.2{\pm}37.2{\mu}V$, $17.5{\pm}42.6{\mu}V$ and $28.3{\pm}40.4{\mu}V$, in leads aVR, aVL and aVF were $-3.9{\pm}32.5{\mu}V$, $-15.9{\pm}35.6{\mu}V$ and $26.2{\pm}37.5{\mu}V$, respectively.
초소형 카메라 모듈을 위한 Tubular형 선형 액츄에이터의 설계와 관한 연구
정인성(In-Soung Jung),허진(Jin Hur),성하경(Ha-Gyeong Sung) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
This paper presents design results of an ultra-small actuator for auto focus or optical zoom function of mobile phone cameras. The consideration of the actuator is tubular type having a large hole in its center to arrange some optical lenses. The stator consists of 3-phase windings, and the mover is designed to an Nd injection permanent magnet(PM) which magnetized with multi-pole polar pattern. From the numerical analysis that taking into account the magnetizing pattern of the PM, the thrust of the designed actuator is about 40mN with the outer diameter of 7㎜.