축산물 위생ㆍ안전성 관리 현황과 향후추진 대책

이상진,Lee, Sang-Jin 한국육가공협회 2004 肉加工 Vol.30 No.-

Polyvinyl Alcohol 폴리머 용액법으로 합성한 스포듀민 분말의 특성연구

이상진,박지은,Lee, Sang-Jin,Park, Ji-Eun 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.1

LAS-system ceramic powder, spodumene ($Li_2O{\cdot}Al_2O_3{\cdot}4SiO_2$), was successfully synthesized by a chemical solution technique employing PVA(polyvinyl alcohol) as an organic carrier. The PVA content affected the microstructure of porous precursor gels and the crystalline development. The optimum PVA content contributed to homogeneous distribution of metal ions in the precursor gel and it resulted in the synthesis of glass free $\beta$-spodumene powder having a specific surface area of $7.57\;m^2/g$. The agglomerated $\beta$-spodumene powders were also enough soft to grind to fine powders by a simple ball milling process. The microstructures of the densified powder compacts were strongly dependant on the minor phases of spodumene solid solution and amount of liquid phase, which were formed from the inhomogeneous precursors.

달걀껍질의 재 사용에 의해 제조 된 생체용 Calcium Phosphate 분말의 상변화 거동 및 미세구조 변화에 관한 연구

이상진,김주원,Lee Sang-Jin,Kim Joo-Won 한국분말야금학회 2004 한국분말재료학회지 (KPMI) Vol.11 No.5

Calcium phosphate powders were successfully synthesized by using re-cycled eggshell and phosphoric acid. The crystallization behavior and powder morphologies of the synthesized powders were dependent on the starting condition of the eggshell, the mixing ratio and method of the eggshell and phosphoric acid, and calcination temperature. In general, $\beta$-tricalcium phosphate was stably synthesized at about $900^{\circ}C$ for 1h at each proper mixing ratio. And, the synthesized powders showed the similar microstructures to the morphology of original eggshell with uniform particle sizes. In this study, the calcium phosphate powders were synthesized with eggshell in various processing method. And their unique microstructures obtained from the eggshell were also. observed. The crystalline developments and microstructures of the synthesized powders were examined by X-ray diffractometer and scanning electron microscopy.

일차성 불면증에서 심박동률변이도와 수면구조 간의 상관관계

이상진,박두흠,유재학,유승호,하지현,송만규,Lee, Sang-Jin,Park, Doo-Heum,Yu, Jae-Hak,Ryu, Seung-Ho,Ha, Ji-Hyeon,Song, Man-Kyoo 대한수면의학회 2010 수면·정신생리 Vol.17 No.1

목 적: 일차성 불면증(primary insomnia)은 자율신경계에도 영향을 주는 것으로 알려져 있는데 심박동률변이도 (heart rate variability: HRV)를 이용하여 일차성 불면증에서 심박동률변이도 지수와 수면구조(sleep structure) 관련 변인 간의 연관성을 분석하여 일차성 불면증의 야간수면 동안 자율신경계 변화의 특징을 연구하고자 하였다. 방 법: 일차성 불면증 33명(평균연령: 36.2${pm}$14.2세, 남:여=15:18)을 대상으로 1일밤 야간수면다원검사(nocturnal polysomnography:NPSG)를 시행하여 HRV 지수 중 저주파수/고주파수 비(high frequency/low frequency ratio:LF/HF ratio)와 NPSG에서 산출된 수면구조 관련변인 간의 상관관계를 분석하였다. 결 과: 연령과 성별을 통제한 상태에서 LF/HF ratio와 서파수면(slow wave sleep)의 시간과 분율, 2단계수면시간 (stage 2 sleep)과 분율이 각각 음의 상관관계($r_p$=-0.37, p=0.04, $r_p$=-0.4, p=0.02; $r_p$=-0.42, p=0.02, $r_p$=-0.43, p=-0.01)를 가지는데 비해 각성지수(arousal index)와는 양의 상관관계($r_p$=0.65, p<0.001)를 보였다. 결 론: 일차성 불면증에서 수면구조 변화에 따라 자율신경계가 반응하고 있으며, 특히 비렘수면(Non-REM sleep)의 구성요소인 서파수면과 2단계수면의 감소와 각성 횟수의 증가가 교감신경 항진을 유발하여 불면증의 전형적인 수면 구조 변화가 심혈관계에 부정적 영향을 줄 수 있다는 것을 보여준다. Objectives: It is well established that primary insomnia affects the activity of autonomic nervous system. We tried to know how the activity of autonomic nervous system during night sleep changes by analyzing correlation between heart rate variability (HRV) index and the variables related with sleep structure in primary insomnia. Methods: Thirty three subjects (mean age: $36.2{\pm}14.2$ years, male:female=15:18) who were diagnosed with primary insomnia were selected for the study. Nocturnal polysomnography (NPSG) was carried out on each subject and correlation was analyzed between high frequency/low frequency ratio (LF/HF ratio), one of HRV indices and the variables related with sleep structure which were calculated from NPSG. Results: When age and sex were controlled, LF/HF ratio showed negative correlations with slow wave sleep and stage 2 sleep, respectively ($r_p$=-0.43, p=0.01; $r_p$=-0.37, p=0.04). On the other hands LF/HF ratio showed a positive correlation with arousal index ($r_p$=0.65, p<0.001). The activity of autonomic nervous system responded differentially depending on the change of sleep structure in primary insomnia. Especially the increase of arousal index and the decrease of slow wave sleep and stage 2 sleep which are the components of non-REM sleep provoked hyperactivity of sympathetic nervous system. Conclusion: This study suggests that the typical change of sleep structure in primary insomnia can negatively impact on cardiovascular system.

`Tectonic`과 Carlo Scarpa 건축(建築)에서의 디테일에 대한 존재론적(存在論的) 이해(理解)에 관한 연구(硏究) -Heidegger의 실존(實存) 현상학적(現象學的) 사유방식(思惟方式)을 중심(中心)으로-

이상진,변태호,Lee, Sang-Jin,Byun, Tae-Ho 한국건축역사학회 2002 건축역사연구 Vol.11 No.1

The recently published papers and essays regarding 'tectonic' bring us to rumination of its importance on comprehending modern architectural process. Many architectural theorists may seem to seek the substance of architecture through the discussion of 'tectonic' for the purpose of overcoming the dilemma of representation which can be easily found in modern architectural forms. Their emphasizing on its double-faced aspect as the manner of representation, that is semantic and aesthetic, may imply the significance of philosophical approach especially to the recent architectural phenomena. From this point, it ought to be meaningful to manifest etymological connection between the terms with semantic analysis and interpret the substance and ontological meaning of 'tectonic' referring Martin Heidegger's existential philosophy. Besides the works of Carlo Scarpa, that are known as the art of making, are exampled to prove the way how the ontological meaning of practical act is exposed on an artwork. The idea of 'tectonic' connotes not only technological aspect as construction of form and space, but also ontological aspect as joint or detail, that is the result of logos. The 'tectonic' means etymologically 'joint' having double-meaning structure, technology and aesthetics. It means 'detail' as minimum units of architectural form and as sites where making relationship or connection takes place in the way of ontological apprehension. The 'detail' as the place of innovation and invention implies the culture of an area, and expresses craftsmanship, which modem architecture buries in oblivion. This study aims to deviate from the aesthetical commercialization in which the modern architecture tends to fall, and further, propose the possible way to succeed traditional locality in an epistemological point of view.

축산물 가공품을 효율적으로 관리하기 위한 방안은?

이상진,Lee, Sang-Jin 대한양돈협회 1996 養豚 Vol.18 No.7

전시 155밀리 포병탄약에 대한 제 3국 조달의 계량적 효과분석

이상진,박상현,Lee, Sang-Jin,Bak, Sang-Hyeon 한국국방경영분석학회 2011 한국국방경영분석학회지 Vol.37 No.1

본 연구는 시뮬레이션을 이용하여 전시 3국으로부터의 탄약조달 효과를 계량적으로 분석하였다. 이를 위해 전시 탄약확보, 조달계획, 통합수송계획 그리고 3국과의 군수협력에 관한 개념에 대해 알아보고 3국 탄약지원 가능성을 살펴보았다. 다음으로 시뮬레이션을 이용하여 전시 미국과 한국의 해상수송과정에 대한 기본모형을 만든 후 미국 및 3국과 한국의 해상수송과정에 대한 비교모형 (3국모형)을 만들었다. 마지막으로 모형별로 탄약의 최종수송완료일, 작전단계별 수송량에 대해 비교 분석을 실시한 후 3국 탄약지원량에 대한 민감도 분석을 실시하였다. 연구 결과 3국모형은 기본모형보다 탄약을 약 10% 더 조달할 수 있었다. This study analyzes the quantitaive effect of 155M artillery ammunition procurement from third party countries in the wartime using simulation. First, we study the concept of ammunition supply, procurement plan, transportation plan in the wartime and logistics support from third party countries. We then study the ammunition support possibility from third party countries. Secondly, we make a basic model on the sea-lift from Korea to U.S in the wartime using simulation followed by making comparative models on the sea-lift from Korea to U.S and third party countries. Finally, we analyze models on the completion date of ammunition transportation and the ammunition amount of each operation step. We then execute the sensitivity analysis on the ammunition amount from third party countries. In cocclusion, ammunition prcurement from third party countreis more supply 10% than basic model.

자연물의 미세구조를 활용한 다공성 인산칼슘 제조

이상진,이훈철,Lee, Sang-Jin,Lee, Hoon-Cheol 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.3

Porous calcium phosphates were successfully fabricated by using a cuttlefish bone. The cuttlefish bone, which is composed of $CaCO_3$, showed a special porous microstructure containing uniform-sized voids. In this study, the pre-forms infiltrated distilled phosphoric acid were sintered at $1200^{\circ}C$ in an air atmosphere. The porous microstructure of the pre-forms was kept their original pattern after sintering with a synthesis of calcium phosphate. The obtained porous calcium phosphate, sintered at $1200^{\circ}C$ for 3 h at 17% concentration of phosphoric acid, showed uniform open pores of 150 ${\mu}m$ in size and $\beta$-TCP phase in the XRD patterns. Above 16% concentration, CaO phase, derived from the decomposition of $CaCO_3$, decreased gradually in the sintered samples, and the measured Ca/P ratios of the samples prepared from 16% and 18% concentration were 1.67 and 1.43, which are close to stoichiometric HA (1.66) and $\beta$-TCP (1.50).

집중탐구 - 고병원성 조류인플루엔자와 가금 및 그 생산물의 무역

이상진,Lee, Sang-Jin 한국오리협회 2013 오리마을 Vol.115 No.-

K-1전차의 고장분포와 부하에 따른 고장률 차이에 대한 연구

이상진,최석윤,Lee, Sang-Jin,Choi, Seok-Yoon 한국국방경영분석학회 2009 한국국방경영분석학회지 Vol.35 No.2

이 연구는 국방장비의 고장률함수가 욕조곡선을 이루고 있는지를 조사하기 위한 것이다. 국방장비 가운데 K-1 전차를 선택하여 고장확률밀도함수에 대한 고장률함수의 형태를 조사하였다. 또 다른 목적은 전차 운용환경에 따라 고장발생 차이가 발생하는지를 조사하는 것이다. 연구 결과, K-1전차의 고장률은 대체로 와이블분포를 따르고 있음을 보여준다. 와이블분포는 욕조곡선과 같이 시스템의 고장률이 전체 수명주기동안 다른 모양을 가지고 있을 때 유용하다. 전차가 운용을 개시하는 초기시점의 고장률함수는 고장이 많이 발생하다가 시간이 경과함에 따라 점차 낮아지는 와이블분포의 감소형 함수를 따르고 있다. 초기고장 시기를 지나면 고장이 안정적으로 발생하는 임의고장 단계에 이르며 이 시기는 고장률이 일정한 와이블분포를 따르게 된다. 장비의 사용기간이 증가하게 되면 마모로 인한 고장이 점차 증가하며 고장률함수는 증가형 함수를 따르게 된다. 또한 연구를 통해 전차의 운용 지형이 열악한 환경에서 고장이 더 많이 발생하고 있음을 알 수 있다. 연구 결과 시사점으로는 창정비 주기를 설정하는데 있어 욕조곡선에서 마모고장이 발생하는 시점을 창정비 시기로 선택해야 할 것이다. 또한 전차 운용 지형을 고려하여 창정비 주기를 조절해야 할 것이다. The objective of this study is as follows. First, the hazard function on the failure probability density function of the K-1 tracked vehicles can be occurred in the form of the bathtub curve. Second, the failure mode may be different under two different operational situations. The research result shows that the bathtub curve can be fitted in the Weibull distribution, that assumes different shapes according to the specific stage of the system's life cycle. The K-1 tracked vehicle has a relatively high hazard(failure) rate at the time of its first service. The failure rate starts decreasing for a time immediately after it goes into service. After the break-in period, the surviving components have a fairly constant hazard rate. As the K-1 system ages, deterioration of its various parts takes place and the hazard rate starts Increasing. Second, the result shows the failure rate in the harsh operational environment is higher than that in the mild operational environment. In conclusion, the bathtub curve can be logically appropriate in establishing the depot overhaul cycle. Moreover, it is necessary for determining the right time of the depot overhaul to consider not only the age of defense equipment but also the different operational environment.