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Prevalence of anatomical alar band
김정석,김철순,차정열,김희진,황충주,Kim, Jung Suk,Kim, Cheol Soon,Cha, Jung Yul,Kim, Hee Jin,Hwang, Chung Ju Korean Academy of Esthetic Dentistry 2015 Journal of the Korean Academy of Esthetic Dentistr Vol.24 No.1
Purpose: 입술 주위에는 여러 개의 근육이 모여있기 때문에 여러 근육의 작용에 의해 표정을 지을때, 다양한 표정과 노화에 따른 주름 등의 변화가 나타나게 된다. 동물에서는 이러한 피부 및 근육이 몸 전체에 발달되어 있지만 사람에서는 얼굴에만 잘 발달되어 있고, 다른부위엔 목과 손바닥에 하나씩 있을 뿐이다. 해부학적인 연구에서 확인한 작은광대근의 변이중에 윗입술뿐만 아니라 콧방울로 갈라진 힘살이 콧방울 가쪽 부위에도 닿아서 형성되는 콧방울 가쪽 주름에 대해 alar band라 명명하였으며 이에 대한 임상적인 유병율을 알아보고자 한다. Materials & Methods: 교정 치료를 위해 경기도 개인치과의 교정과에 내원한 780명의 교정신환의 스마일 사진에서 alar band의 여부에 대해 알아보고, 측모두부방사선사진에서 골격의 형태 및 입술의 돌출, 성별, 연령 등과의 상관관계를 평가하였다. Results: 일반적 특성에 따른 alar band의 관련성에 대해서 살펴본 결과 성별에 대해서 남자는 18.5%, 여자는 27.9%로 나타나 남자보다 여자의 경우 더 비율이 높은 것으로 나타났으며, 통계적으로 유의한 차이를 보였다(p<.05). 연령에 대해서는 가진 경우가 0-9세는 19.4%, 10-19세는 16.9%, 20-29세는 31.2%, 30-39세가 39.5%, 40-49세가 56.5%로 나타나 20대에서 40대로 갈수록 점차 증가하는 경향을 보였으며 통계적으로 유의한 차이를 보였다(p<.001). SN_NP에 대해서는 normodivergent facial type을 가진 경우가 26.2%, hyperdivergent facial type을 가진 집단이 22.0%, hypodivergent facial type을 가진 경우는 32.2%로 나타나 hypodivergent facial type을 가진 집단의 경우가 더 발생비율이 높게 나타났으나 통계적으로 유의한 차이를 보이지 않았다. Upper LIP에 대해서는 통계적으로 유의한 차이를 보이지 않았지만 Lower lip에 대해서는 alar band를 보인 경우가 정상하순 안모를 가진 집단은 26%, lower lip protrusion은 14.7%, retruded lower lip은 33.3%로 나타나 retruded lower lip의 경우 발생비율이 높게 나타났으며 통계적으로 유의한 차이를 보였다(p<.05). 즉, 성별, 연령, lower lip돌출정도에서 alar band와의 유의한 관련성을 보임을 알 수 있었다. Conclusions: alar band는 해부학적인 연구에서 27.8%에서 보였으며, 본 연구에서는 25.6%에서 확인할 수 있었고, 임상적인 사진에서는 여자, 나이가 들수록, 하순이 함입될수록 유의하게 더 보였으며 향후 심미 치료에서 이 부위에 보톡스 등의 심미치료를 할 때 도움이 될 수 있을 것이다. Purpose: Due to the presence of various muscles around lips, variety of facial expression can be made and changes from aging process such as wrinkles can develop on the facial skin by the action of multiple muscles. In animals, skin and muscles are developed in the entire body. On contrast, they are well developed only in the face and just one is present in the neck and the palm. Alar band was defined as outer wrinkle formed by zygomaticus minor muscle, which is common in Koreans. This study aimed to investigate clinical prevalence of alar band. Materials & Methods: Subjects were chosen from 780 new patients who visited private clinic in Gyeonggi province for orthodontic treatment. Presence of alar band was examined from the smile extraoral photos. Correlation among skeletal form, lip protrusion, gender, and age were evaluated. Results: Prevalence of alar band was higher in women (27.9%) than in men (18.5%) with statistical significance (p<0.05). With respect to age, prevalence of alar band was 19.4% in age 0-9 y, 16.9% in age 10-19 y, 31.2% in age 20-29 y, 39.5% in age 30-39, 56.5% in age 40-49. Prevalence was gradually increased from patients in their 20s to patients in their 40s and statistical significance was found (p<0.001). Concerning SN_NP, prevalence was 26.2% in normodivergent facial type, 22.0% in hyperdivergent facial type, and 32.2% in hypodivergent facial type. Hypodivergent facial group had higher prevalence but statistical significance was not observed. Statistically significant difference was not found regarding upper lip. However, prevalence of the alar band was 26% in patients with normal lower lip, 14.7% in patients with pretruded lower lip, and 33.3% in retruded lower lip. The prevalence was higher in patients with retruded lower lip with statistical significance (p<0.05). Conclusions: 27.8% on previous anatomical study and this study showed 27.8% prevalence of alar band in clinical smile photographs. Clinical photograph study showed that alar band was more prominent in women, older people, and people with retruded lips with statistical significance. This will provide valuable diagnostic information for esthetic consideration.
페라이트기 9Cr 내열강의 크리프-피로손상에 따른 미세조직 및 초음파 비파괴평가
김정석,권숙인,박익근,Kim, Chung-Seok,Kwun, S.I.,Park, Ik-Keun 한국재료학회 2007 한국재료학회지 Vol.17 No.8
The microstructural evolution of ferritic 9Cr-1Mo-V-Nb steel, subjected to creep-fatigue at $550^{\circ}C$, was evaluated nondestructively by measuring the ultrasonic velocity. The variation of the ultrasonic velocity with the fatigue life fraction exhibited three regions. In the first region ($N/N_f$<0.2), a significant increase in the velocity was observed, followed by a slight increase between the fatigue life fractions of $0.2N_f$ and $0.8N_f$, and then a decrease in the final region. The change of the ultrasonic velocity during creep-fatigue was interpreted in relation to the microstructural properties. This study proposes an ultrasonic nondestructive evaluation method of quantifying the level of damage and microstructural change during the creep-fatigue of ferritic 9Cr-1Mo-V-Nb steel.
× Populus albaglandulosa 의 수액류속도 (樹液流速度)
김정석,선순화,황진성 ( Chung Suk Kim,Soon Hwa Sun,Jin Sung Hwang ) 한국산림과학회 1978 한국산림과학회지 Vol.37 No.1
To obtain some informations for the water supply problems of ×Populus albaglandulosa, a series of experiments on the speed of sap movement in the trunk of ×P. albaglandulosa was carried out under the different tree age, soil moisture, time of day, and seasonal condition, by method of injecting of 1% Fuchsin solution. The results showed that the speed of sap movement was great in the conditions of low relative humidity, abundant leaves, and high temperature, but it was less influenced by different tree age and soil moisture.
김정석,Kim, Cheong-Seok 한국인구학회 2007 한국인구학 Vol.30 No.2
저출산 현상의 지속과 심화, 그리고 그것이 갖는 사회적 파장이 부각됨에 따라 출산관련연구가 다시 활기를 띠고 있다. 특히 최근에는 IMF 위기라는 전사회적 현상 속에서 개인의 출산행위가 어떻게 변화하는가에 대한 연구들이 주목을 받고 있다. 이 연구는 기존연구들을 바탕으로 출산행위에 관련된 요소들을 사회인구학적 변수와 경제적 상황, 출산관련 생활사건변수, 시부모 및 친정부모 생존여부, 현존자녀 및 이상자녀변수 등으로 파악하였다. 그러나 기존연구들과는 달리 출산아수가 아니라 출산계획을 분석대상으로 하는 한편, 현재의 출산아수별로 출산계획과 그에 영향을 미치는 요소들을 분석하고 있다. 한국보건사회연구원이 실시한 '전국 결혼 및 출산 동향조사'에서 35세 이하 기혼여성들을 추출해 분석해 본 결과, 첫째아 계획은 보편적인 현상이며 둘째아 계획에는 가구경제의 안정성, 양육보조자의 존재 등이 중요한 요소임을 발견했다. 이는 둘째아 계획이 주어진 경제와 양육여건에 따라 선택적으로 이루어질 수 있음을 의미한다. 한편, 셋째아 계획은 남아의 존재여부와 이상자녀의 성 구분이 중요한 것으로 나타나, 남아(선호)가 여전히 상당 역할을 하고 있음을 발견했다. 이는 출산아수에 따라 출산계획의 기제가 차별적임을 의미한다. 출산계획의 출산아수별 차별적인 기제는 출산행위에 대한 깊이를 더할 것으로 예상된다. 또한 이 같은 기제를 접근하는 데 있어 계량적인 접근방식과 더불어 심층적이고 체계적인 질적 연구(특히 집단초점토론)가 병행되어야 할 것이다. As the fertility level in Korea continues to drop with detrimental implications for the society, it has regained much attention of academics and policy makers. This study, building on the previous research on fertility behavior, attempts to explore the plan of young married women to have an additional child. While such plan is not always put into practice, it is still closely related to fertility behavior. In addition, it can provide useful clues to understanding behavior in the future. Utilizing a recent nationwide survey on marriage and fertility, the study analyzes the plan of further birth among young married women according to the number of their children. The results show that the plan for first child is quite universal as no difference is found by their socioeconomic and demographic characteristics. However, having plan for second child differs by the work status of husbands, presence of mother of young married women, and the sex of first child. The effects of first two factors suggest that young married women take into consideration stability of home economics and availability of care sharing. As for the plan for the child, the present and ideal sex composition of children appear most important. The results indicate that the mechanism of fertility progression differs by the current number of children. Thus, consideration of such differential would help us deepen our understanding of fertility behaviors and need to reflect in the study. The study also argues that comprehensive and systematic qualitative research should be accompanied by to capture complexity of fertility decision making process.
솔잎혹파리 내충성 (耐蟲性) 품종 육성에 관한 연구 2. 솔잎혹파리 내충성 Pinus thunbergii 의 침엽내 monoterpene 의 계절적변화
김정석,홍성호,류장발,최철,김종수 ( C . S . Kim,S . H . Hong,J . B . Ryu,C . Choi,J . S . Kim ) 한국산림과학회 1976 한국산림과학회지 Vol.32 No.1
Employing 7-15 resistant and 8-15 susceptible Japanese black pine (Pinus thunbergii Parl.) trees to pine gall midge (Thecodiplosis japonensis Uchida et Inouye) as samples, needle monoterpenes were analysed by GLC in January and June, and observation was made on the oviposition preference. Following results were obtained. 1. In January, the resistant trees showed higher contents of myrcene, limonene, β-phellandrene and terpinolene but lower contents of α-and β-pinene and camphene compared to the susceptible trees. But in June, α-pinene, camphene, limonene, β-phellandrene and terpinolene were higher and the content of β-pinene and myrcene were lower in the resistant trees than the susceptible trees. 2. The content of limonene was higher by the 6.8 percent and the content of β-pinene was lower by the 9.2 percent in the resistant trees than in the susceptible trees in June. 3. No preference for oviposition was found between resistant and susceptible trees. But in the resistant trees gall formation rate was quite lower than the susceptible trees. It was considered, therefore, that limonene and β-pinene content in the needle might be used as an indicator of the resistant Japanese black pine to the pine gall midge regardless of season.
란탄족(III)족 이온과 Diaza-18-crown-6-diisopropionic Acid의 착화합물에 관한 연구
김정석,이창헌,한선호,서무열,엄태윤,박진하,Jung Suk Kim,Chang Heon Lee,Sun Ho Han,Moo Yul Suh,Tae Yoon Eom,Jin Ha Park 대한화학회 1992 대한화학회지 Vol.36 No.6
이온성 거대고리 리간드, diaza-18-crown-6-diisopropionic acid(K22DAP)를 합성하였다. 이 화합물의 양성자화 상수와 몇 가지 란탄족원소와의 안정도 상수를 전위차적정 방법으로 측정하였다. 양성자화 상수는 log$K_1$ = 9.05, log$K_2$ = 8.37, log$K_3$ = 1.88 및 log$K_4$ = 0.99이고, La(III), Nd(III), Gd(III) 및 Lu(III)와의 안정도 상수 (logKML)는 각각 11.14, 11.43, 11.74 및 10.88이었다. 거대고리 이온운반 물질로서 K22DAP를 사용하고 TTA(thenoyltrifluoroacetone)를 추출제로 하여 란탄(III)족 이온의 추출성질을 연구하였다. pH 8.0의 수상에서 La(III)과 Nd(III)이온은 주로 삼성분착물 Ln(K22DAP)TTA를 형성하였다. An ionizable macrocyclic ligand, diaza-18-crown-6-diisopropionic acid(K22DAP) has been synthesized. Protonation constants of this compound and stability constants with some lanthanides were determined by potentiometric titration method. The protonation constants are log$K_1$ = 9.05, log$K_2$ = 8.37, log$K_3$ = 1.88 and log$K_4$ = 0.99. The logarithmic values of stability constants with La(III), Nd(III), Gd(III) and Lu(III) are 11.14, 11.43, 11.74 and 10.88 respectively. Extraction behavior of Ln(III) ion was investigated using TTA(thenoyltrifluoroacetone) as extractant in the presence of K22DAP as macrocyclic ionophore. It was observed that Ln(K22DAP)TTA is the dominating species in aqueous complexes of La(III) and Nd(III).
방사성동위체를 이용한 × Populus albaglandulosa 의 인산흡수상에 관한 추적연구 (Ⅰ) - 고토시용이 (苦土施用) 식물체내의 인산함유율에 미치는 영향 -
김정석,이석구,안학수,선순화 ( Chung Suk Kim,Suk Koo Lee,Hak Soo Ahn,Soon Wha Sun ) 한국산림과학회 1978 한국산림과학회지 Vol.37 No.1
The uptake ratio of supplying P³² labelled double superphosphate and the hastening efficiency of the uptake by addition of magnesium sulfate to the fertilizer were studied on the ×Populus albaglandulosa planted with 0/1 cutting in 1975. The results are summerized as follows. 1. Average 13% of supplying double superphosphate was absorbed into × Populus albaglandulosa planted on the reddish heavy clay soil in Institute of Forest Genetics. 2. The accumulation of absorbed magnesium was more amount in leaf than in stem. 3. The uptake ratio of supplying double superphosphate was able to increase up to 16%∼33% by the addition of magnesium sulfate to the fertilizer. 4. It might be possible to increase the tree growth following the acceleration of photosynthesis due to the increasing amount of magnesium known to be a component of chlorophyll in leaf as well as to hasten the efficiency of uptake of phosphorus by the addition of magnesium to double superphosphate.
Natural Frequency Evaluation of a Lightweight GFRP Composite Bogie Frame
김정석,이우근,Il-Kyeom Kim,윤혁진 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
A glass-fiber-reinforced plastic (GFRP) composite bogie frame was designed and manufactured in this study. The lightweight GFRPbogie frame was designed to not only sustain heavy static and dynamic loads but also have a suspension function. Therefore, itsdynamic characteristics are an important factor. In this study, its natural frequency was evaluated by means of a modal test and thetest results were validated using a finite element analysis. Given these experimentally obtained dynamic characteristics, the runningperformance of a railway vehicle equipped with the GFRP bogie frame was assessed. The first bending natural frequency of thecomposite bogie frame was 22.8 Hz, which corresponds to 27.7% of the steel frame. The vehicle dynamic analysis results showed thatthe derailment index, dynamic wheel unloading, wheel wear index, and ride comfort satisfied the design requirements.
수용액 합성법의 2단계 성장온도 변화를 통한 ZnO 결정의 선택적 용해 현상
김정석,채기웅,Kim, Jeong-Seog,Chae, Ki-Woong 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.4
ZnO hexagonal rods grown in aqueous solution can be changed into a tubular shape by two-step aging in the course of the growing process. In the first step, hexagonal ZnO rods is grown by aging at $90^{\circ}C$ under a highly supersaturated aqueous solution giving rise to a fast precipitation rate. Meanwhile, during the second step aging at $60^{\circ}C$ in the same aqueous solution, the hexagonal polar face (001) having higher surface energy than (010) side planes dissolves to minimize surface energy. Hence the flat (001) face changes to a craterlike face and the hexagonal rod length of ZnO decreases at an initial-stage of this step aging. The formation of the (101) wedge-type faces is ascribed to the resultant of competitive reactions between the dissolution of polar face minimizing the surface energy which is a dominant reaction at the initial stage and the precipitation reaction dissipating supersaturation. At a later stage of the second-step the reaction rates of these two processes in the aqueous solution become similar and the overall reaction is terminated.
열처리 분위기가 Eu 이온이 첨가된 Li-Al-O계 형광체 특성에 미치는 영향
김정석,천채일,채기웅,Kim, Jeong Seog,Cheon, Chae Il,Chae, Ki-Woong 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.1
New green phosphor is synthesized by reducing $LiAlO_2:xEu^{3+}$ phosphors in a low pressure $H_2$ atmosphere. The $LiAlO_2:xEu^{3+}$ prepared by a solid state reaction method is reported as red phosphor. The effect of the reduction treatment on the $LiAlO_2:xEu^{3+}$ on the crystalline phase change and photoluminescence (PL) property are characterized. The reduced phosphor had a broad green light spectrum centered at 524 nm. The PL intensity of the reduced phosphor increased to a maximum at the reduction temperature of $1100^{\circ}C$. The PL intensity decreased with a further increase in the reduction temperature. The crystalline phase constituting the reduced phosphor varied with the temperature. A new crystalline phase $Li_2Al_4O_7$ was observed at $1100^{\circ}C$. The origin of the green-light emission is discussed in relation to the crystalline phase change.